Note: Descriptions are shown in the official language in which they were submitted.
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a
DESCRIPTION
TITLE OF THE INVENTION:
VANE MEMBER FOR PAPER SHEET CONVEYANCE IMPELLER
TECHNICAL FIELD
[0001]
The present invention relates to a vane member for a paper sheet-conveyance
impeller used for conveying paper sheets.
BACKGROUND ART
[0002]
A conveyance device for conveying paper sheets such as paper moneys, magnetic
cards and tickets is installed in automatic ticket gates, automatic register
change machines,
money changing machines, automatic ticket vending machines, and the like. A
paper
sheet-conveyance impeller for conveying paper sheets is used in the conveyance
device.
The paper sheet-conveyance impeller is constituted such that a plurality of
vane members
are radially attached in a radial direction orthogonal to a rotating shaft of
a rotatable
cylindrical member. The paper sheet-conveyance impeller rotates vane members
at high
speed and bring them into contact with paper sheets, thereby conveying paper
sheets by
frictional force when contacting.
[0003]
Since the vane member is brought into contact with paper sheets, plastic
deformation is generated due to long-term use and damages such as abrasion,
breakage and
crack occur. When plastic deformation is generated, the vane member is not
sufficiently
brought into contact with paper sheets, leading to a cause for conveyance miss
and the like.
In view of the problem, a structure that the vane member is made to be
detachably attached
to a cylindrical member, thereby making it possible to replace the vane
member, is
proposed. In other words, the vane member is required to suppress plastic
deformation
and enhance bending durability.
[0004]
In view of the above, Patent Document 1 proposes a vane member using a
thermosetting urethane formed by casting and an aramid twisted yarn as a core
wire in
order to suppress thermoplastic deformation of a vane member and enhance
bending
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durability thereof. Patent Document 2 proposes a vane member using a
thermosetting
polyurethane and a core wire including nylon. However, bending durability was
not
sufficiently satisfied even in the vane members described in Patent Documents
1 and 2.
To suppress plastic deformation of the vane member, flexibility capable of
bending is
required while enhancing bending durability and maintaining strength.
Specifically, the
vane member should be difficult to cause plastic deformation, that is,
restorability capable
of returning to the original shape is required while enhancing bending
durability.
PRIOR ART DOCUMENT
PATENT DOCUMENT
[0005]
Patent Document 1: JP-A-2013-155032
Patent Document 2: JP-A-2015-205771
SUMMARY OF THE INVENTION
PROBLEMS THAT THE INVENTION IS TO SOLVE
[0006]
The present invention is to solve the problems described above and has an
object
to provide a vane member for a paper sheet-conveyance impeller that suppresses
plastic
deformation and enhances bending durability and restorability.
MEANS FOR SOLVING THE PROBLEMS
[0007]
To solve the above problems, the vane member for a paper sheet-conveyance
impeller according to the preset invention is a vane member for a paper sheet-
conveyance
impeller, at least one the vane member being to be arranged so as to protrude
from an outer
peripheral surface of a rotatable cylindrical member, the vane member
including: a vane
member body including a thermosetting polyurethane elastomer; and a plurality
of core
wires being arranged side by side in a shaft direction of a rotating shaft of
the cylindrical
member and each including a polyester fiber, in which at least a part of the
core wire is
embedded inside the vane member body.
[0008]
In this constitution, at least one vane member for a paper sheet-conveyance
impeller is arranged so as to protrude from an outer peripheral surface of the
rotatable
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=
cylindrical member. The vane member for a paper sheet-conveyance impeller may
be
brought into contact with paper sheets to convey those. The vane member for a
paper
sheet-conveyance impeller includes the vane member body and the core wire. The
vane
member body includes a thermosetting polyurethane elastomer. The core wire
includes a
polyester fiber. At least a part of the core wire is embedded inside the vane
member
body. A plurality of the core wires are arranged side by side in the shaft
direction of the
rotating shaft of the cylindrical member.
Elastomer materials having excellent elasticity are preferable for the vane
member
body from the standpoint of restorability. Of the elastomer materials, a
thermosetting
polyurethane elastomer has particularly excellent abrasion resistance and
elasticity. The
polyester fiber constituting the core wire has excellent heat resistance and
strength. From
the standpoint of bending durability, a polyester fiber, an aramid fiber and a
nylon fiber are
preferred for the core wire, and a polyester fiber that is difficult to buckle
against plastic
deformation is particularly suitable. In the case where the vane member body
includes a
thermosetting polyurethane elastomer and the core wire includes a polyester
fiber,
deformation force (compressive force) generated inside the core wire when
bending can be
reduced and bending durability and restorability of the vane member are
enhanced.
Specifically, the vane member for a paper sheet-conveyance impeller of the
present
invention can suppress plastic deformation and enhance bending durability and
restorability.
[0009]
According to another standpoint, the vane member for a paper sheet-conveyance
impeller of the present invention preferably has the following constitution.
The fineness of the core wire is in a range of 100 to 300 deniers.
Alternatively,
the fineness of the core wire is in a range of 120 to 180 deniers.
[0010]
In this constitution, the fineness of the core wire is preferably in a range
of 100 to
300 deniers. The diameter of the core wire (core wire diameter) is preferably
in a range
of 0.10 to 0.19 mm. Furthermore, the fineness of the core wire is more
preferably in a
range of 120 to 180 deniers. In other words, the diameter of the core wire is
relatively
small. In the case where the diameter of the core wire is large, deformation
force
(compressive force) inside the core wire (particularly, a vicinity of an outer
periphery of a
paper sheet-conveyance impeller) is increased when bending as compared with
the case
where the diameter of the core wire is small, and buckling and breakage are
easy to occur.
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=
Therefore, by making the diameter of the core wire relatively small, the
deformation force
(compressive force) generated inside the core wire when bending can be reduced
and
bending durability is improved. In other words, the vane member for a paper
sheet-conveyance impeller of this constitution can suppress plastic
deformation and further
enhance bending durability and restorability.
[0011]
According to another standpoint, the vane member for a paper sheet-conveyance
impeller of the present invention preferably has the following constitution.
The vane member body includes the thermosetting polyurethane elastomer
containing no plasticizer.
Alternatively, the vane member body includes the thermosetting polyurethane
elastomer containing a plasticizer, and the plasticizer is contained in an
amount of 20 parts
by mass or less per 100 parts by weight of the thermosetting polyurethane
elastomer.
Alternatively, the vane member body includes the thermosetting polyurethane
elastomer
containing a plasticizer, and the plasticizer is contained in an amount of 5
parts by mass or
less per 100 parts by weight of the thermosetting polyurethane elastomer.
[0012]
In this constitution, it is preferred that the vane member body includes a
thermosetting polyurethane elastomer containing a plasticizer, and the
plasticizer is
contained in an amount of 20 parts by mass or less per 100 parts by weight of
the
thermosetting polyurethane elastomer. Furthermore, it is more preferred that
the vane
member body includes a thermosetting polyurethane elastomer containing a
plasticizer, and
the plasticizer is contained in an amount of 5 parts by mass or less per 100
parts by weight
of the thermosetting polyurethane elastomer. The vane member body more
preferably
includes a thermosetting polyurethane elastomer containing no plasticizer. In
the case
where a large amount of the plasticizer is contained in the vane member body,
the
plasticizer bleeds out in the course of repeated contact of the vane member
body with
paper sheets in long-term use, and transfers on the surfaces of paper sheets.
As a result,
the vane member body contacting paper sheets plastically deforms and warpage
of the
vane member occurs. Therefore, in the case where the amount of the plasticizer
contained in the vane member body is decreased or the vane member body does
not
contain the plasticizer, the warpage of the vane member is relatively reduced
and restoring
force is improved. In other words, the vane member for a paper sheet-
conveyance
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impeller of this constitution can suppress plastic deformation and further
enhance bending
durability and restorability.
[0013]
According to another standpoint, the vane member for a paper sheet-conveyance
impeller of the present invention preferably has the following constitution.
The plurality of the core wires are arranged side by side in the shaft
direction of
the rotating shaft with an interval between the adjacent core wires being in a
range of 0.25
to 0.50 mm. Alternatively, the plurality of the core wires are arranged side
by side in the
shaft direction of the rotating shaft with an interval between the adjacent
core wires being
in a range of 0.25 to 0.30 mm.
[0014]
In this constitution, a plurality of the core wires are preferably arranged
side by
side in a shaft direction of the rotating shaft such that the interval between
the adjacent
core wires is in a range of 0.25 to 0.50 mm. Alternatively, a plurality of the
core wires
are more preferably arranged side by side in a shaft direction of the rotating
shaft such that
the interval between the adjacent core wires is in a range of 0.25 to 0.30 mm.
In the case
where the interval between the adjacent core wires is less than 0.25 mm, the
number of the
core wires to be embedded inside the vane member body is increased. As a
result,
rigidity of the vane member is increased and flexibility of the vane member is
decreased.
.. In the case where the interval between the adjacent core wires exceeds 0.50
mm
(particularly, 0.30 mm), the number of the core wires to be embedded inside
the vane
member body is decreased. As a result, there is a possibility that the
deformation force
generated inside the core wires when bending cannot be sufficiently reduced.
For this
reason, in the case where the interval between the adjacent core wires is in a
range of 0.25
.. to 0.50 mm (particularly, in a range of 0.25 to 0.30 mm), flexibility of
the vane member
can be appropriately maintained. In other words, the vane member for a paper
sheet-conveyance impeller of this constitution can suppress plastic
deformation and further
enhance bending durability and restorability.
[0015]
According to another standpoint, the vane member for a paper sheet-conveyance
impeller of the present invention preferably has the following constitution.
The vane member is arranged so as to protrude from the outer peripheral
surface
of the cylindrical member along a radial direction orthogonal to the shaft
direction of the
5
rotating shaft of the cylindrical member, and the core wires are embedded
along the radial
direction of the rotating shaft of the cylindrical member.
Accordingly, in one aspect, the present invention resides in a vane member for
a paper
sheet-conveyance impeller, the vane member being to be arranged so as to
protrude from an
outer peripheral surface of a rotatable cylindrical member, the vane member
comprising: a
vane member body comprising a thermosetting polyurethane elastomer; and a
plurality of
core wires being arranged side by side in a longitudinal shaft direction of a
rotating shaft of
the cylindrical member and each comprising a polyester fiber, wherein at least
a part of the
core wire is embedded inside the vane member body, the core wire has a
fineness being in a
range of 100 to 300 deniers, the plurality of the core wires are arranged side
by side in the
shaft direction of the rotating shaft with an interval between the adjacent
core wires being in a
range of 0.25 to 0.50 mm, and the thermosetting polyurethane elastomer is
plasticizer free.
[0016]
The term "along a radial direction" used herein is not limited to being
parallel to the
radial direction. The term "along a radial direction" includes the case of
curving in a radial
direction and the case of inclining to a straight line showing the radial
direction at a
predetermined angle.
ADVANTAGEOUS EFFECT OF THE INVENTION
[0017]
As described above, according to the present invention, the vane member for a
paper
sheet-conveyance impeller that suppresses plastic deformation and enhances
bending
durability and restorability can be provided.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
[Fig. 1] Fig. 1 is a view schematically illustrating a paper sheet-conveyance
impeller,
(a) is a perspective view and (b) is a top view.
[Fig. 2] Fig. 2 is a perspective view schematically illustrating a cylindrical
member of
a paper sheet-conveyance impeller.
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[Fig. 3] Fig. 3 is a view schematically illustrating a vane member for a paper
sheet-
conveyance impeller, (a) is a cross-sectional view of a part of the vane
member in a radial
direction of a rotating shaft and (b) is X-X cross-sectional view of (a).
[Fig. 4] Fig. 4 is a schematic view schematically illustrating a test
apparatus used in a
bending durability test.
[Fig. 5] Fig. 5 is a schematic view schematically illustrating a restorability
test.
[Fig. 6] Fig. 6 is a graph showing test results of a restorability test.
MODE FOR CARRYING OUT THE INVENTION
[0019]
The embodiments of the present invention will be described by reference to the
drawings.
The vane member for a paper sheet-conveyance impeller according to the present
embodiment is used in a paper sheet-conveyance impeller. The paper sheet-
conveyance
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impeller is used in a conveyance device which conveys paper sheets. The
conveyance
device is installed in automatic ticket gates, automatic register change
machines, money
changing machines, automatic ticket vending machines, and the like in order to
convey or
collect paper sheets such as paper moneys, magnetic cards and tickets.
.. [0020]
(Constitution of paper sheet-conveyance impeller)
As illustrated in Fig. 1, a paper sheet-conveyance impeller 1 has a
cylindrical
member 10 and vane members 20.
In the present embodiment, the vane members 20 are arranged along a radial
.. direction orthogonal to a shaft direction G of a rotating shaft 11 of the
cylindrical member
10. The vane member 20 is arranged so as to protrude from an outer
peripheral surface of
the cylindrical member 10. In Fig. I, the shaft direction G and a
circumferential direction
R of the rotating shaft 11 are indicated by arrows. In the present embodiment,
four vane
members 20 are arranged on the cylindrical member 10. The four vane members 20
are
arranged at equal intervals in the circumferential direction R of the rotating
shaft II of the
cylindrical member 10. The number of the vane member 20 is not limited to 4.
The
number of the vane member 20 is 1 or more. The number of the vane member 20 is
preferably 2 to 16. The vane members 20 may not be arranged at equal intervals
in the
circumferential direction R of the rotating shaft of the cylindrical member
10.
[0021]
(Constitution of cylindrical member)
As illustrated in Fig. 2, the cylindrical member 10 is formed into a nearly
cylindrical shape. The cylindrical member 10 is not limited to a nearly
cylindrical shape.
The cylindrical member 10 may be formed into a nearly polygonal shape. The
cylindrical
member 10 has the rotating shaft 11 (see (b) of Fig. I), a base 12, a shaft
hole 13 and notch
portions 14.
[0022]
The base 12 may be formed of a resin material. The base 12 is formed of, for
example, an engineering plastic. The engineering plastic is a polyacetal, a
polyamide, a
polybutylene terephthalate, or the like. The base 12 has an upper surface 12a,
a bottom
surface 12b and an outer peripheral surface 12c. In the present embodiment,
the shaft
hole 13 is formed at a nearly center of the upper surface 12a and the bottom
surface 12b
(see (b) of Fig. 1). The rotating shaft 11 is inserted in the shaft hole 13.
That is, the
rotating shaft 11 is arranged such that its shaft direction is along a shaft
direction of the
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cylindrical member 10. The base 12 is unrotatably supported on the rotating
shaft 11.
In other words, the base 12 is fixed to the rotating shaft 11. The cylindrical
member 10
may not have the shaft hole 13. In other words, the rotating shaft 11 may be
integrally
formed with the base 12. Thus, the cylindrical member 10 is rotatably
constituted. In
.. other words, the cylindrical member 10 is constituted so as to rotate by
rotating the rotating
shaft 11.
[0023]
The notch portion 14 is formed so as to open on the upper surface 12a.
Furthermore, the notch portion 14 is formed so as to open on the outer
peripheral surface
12c in the upper part of the outer peripheral surface 12c. The upper part of
the outer
peripheral surface 12c is a part of the outer peripheral surface 12c near the
upper surface
12a than the bottom surface 12b. Furthermore, the notch portion 14 is formed
so as to
open to the shaft hole 13. The notch portion 14 may not be formed so as to
open to the
shaft hole 13. The notch portion 14 may be formed so as to open to any one of
the upper
surface I2a and the bottom surface 12b. The notch portion 14 may be formed so
as to
open to the upper surface 12a and the bottom surface 12b. The vane member 20
is
inserted in the notch portion 14. In the present embodiment, the vane member
20 is
inserted in the notch portion 14 from the opening on the upper surface 12a.
The shape of
the notch portion 14 is formed into a shape such that the vane member 20 is
fittable thereto
and does not detach in the radial direction of the rotating shaft 11. The
notch portion 14
fixes the vane member 20 in the radial direction of the rotating shaft 11. On
the other
hand, the notch portion 14 allows the movement of the vane member 20 in the
shaft
direction G of the rotating shaft 11. In other words, the cylindrical member
10 is
constituted such that the vane member 20 is detachable. Accordingly, in the
case where
maintenance of the vane member 20 is required due to the abrasion and the
like, the vane
member 20 can be easily detached and attached, thereby being replaced.
[0024]
(Constitution of vane member)
As illustrated in Fig. 1 and Fig. 3, the vane member 20 has the vane member
body
21 and core wires 25. In (a) of Fig. 1, the description of the core wires 25
are omitted.
In (b) of Fig. 1, the description of a plurality of convex portions 24 on the
vane member
body 21 is omitted.
[0025]
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The vane member body 21 of the present embodiment has the base 22, a body part
23 and a plurality of the convex portions 24. In (b) of Fig. 3, boundary lines
between the
base 22, the body part 23 and a plurality of the convex portions 24 are shown
by broken
lines. For the vane member body 21, the base 22, the body part 23 and a
plurality of the
convex portions 24 may be integrally formed. The vane member body 21 is formed
of a
thermosetting polyurethane elastomer. The thermosetting polyurethane elastomer
has
excellent abrasion resistance and elasticity.
[0026]
As illustrated in Fig. 1 and (a) of Fig. 3, the base 22 is formed on the end
(see Fig.
1) at the rotating shaft 11 side of the body part 23. The base 22 is formed so
as to bulge
from the body part 23 such that the thickness in the circumferential direction
R of the
rotating shaft 11 increases. The base 22 and a part of the body part 23 are
inserted in the
notch portion 14 and fitted thereto. In the present embodiment, the base 22 is
formed so
as to be a nearly semicircular shape in the cross-section orthogonal to the
shaft direction G
of the rotating shaft 11. The shape of the base 22 may not be a nearly
semicircular shape.
The shape of the base 22 may be any shape such that the vane member 20 does
not detach
in a radial direction of the rotating shaft 11 from the notch portion 14 and
is, for example, a
concavo-convex shape.
[0027]
The body part 23 is formed in a nearly rectangular solid shape. In the present
embodiment, the body part 23 is formed so as to have a length La in a radial
direction of
the rotating shaft 11 being longer than a length Lc in the shaft direction G
of the rotating
shaft 11. The body part 23 is formed so as to have the length Lc in the shaft
direction G
of the rotating shaft 11 being longer than a length Lb along the
circumferential direction R
of the rotating shaft 11.
[0028]
A plurality of the convex portions 24 are preferably formed on any one surface
or
on both surfaces of the surfaces of the body part 23 facing the
circumferential direction R
of the rotating shaft 11, although not essential. The surface of the body part
23 and/or the
surfaces of a plurality of the convex portions 24 are faces to contact paper
sheets. The
number of the convex portions 24 is not limited to the number illustrated in
Fig. 3. Since
the convex portions 24 are formed on the surface of the body part 23, the body
part 23 is
easy to bend when contacting with paper sheets. Furthermore, frictional
locking force
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between the body part 23 and paper sheets is improved, slip between the body
art 23 and
paper sheets is decreased, whereby satisfactory conveyance can be performed.
[0029]
The thermosetting polyurethane elastomer forming the vane member body 21 can
be obtained by thermally curing a prepolymer obtained from a polyol and a
polyisocyanate,
and a curing agent. Alternatively, the thermosetting polyurethane elastomer
can be
obtained by thermally curing a polyol, a polyisocyanate and a curing agent.
The
thermosetting polyurethane elastomer is preferably compounded so as to have an
NCO
index value (isocyanate group/active hydrogen group) that is a molar
equivalent ratio being
in a range of 0.8 to 1Ø The isocyanate group is an isocyanate group of the
prepolymer or
polyisocyanate. The active hydrogen group is an active hydrogen group of the
polyol and
curing agent, an active hydrogen group of the polyol, or an active hydrogen
group of the
curing agent,
[0030]
The polyol is not limited to a polyol having two or more hydroxyl groups in
the
molecule. As the polyol, for example, polyether polyols, polyester polyols,
polylactone-based polyester polyols, polycarbonate polyols, polyolefin
polyols, and the
like can be used in one kind alone or as a combination of two or more kinds
thereof.
[0031]
The polyether polyols include polyethylene glycol, polypropylene glycol,
polytetramethylene ether glycol, and the like.
[0032]
The polyester polyols can be obtained by reacting a dicarboxylie acid compound
with a polyol compound. The dicarboxylic acid compound includes adipic acid,
sebacic
acid, itaconic acid, maleic anhydride, terephthalic acid, isophthalic acid,
fumaric acid,
succinic acid, oxalic acid, malonic acid, glutaric acid, pimelic acid, suberic
acid, azelaic
acid, and the like. The polyol compound includes ethylene glycol, diethylene
glycol,
1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,2-propanediol, 1,3-
propanediol,
1,9-nonanediol, 3-methyl-1,5-pentanediol, tripropylene glycol,
trimethylolpropane,
glycerin, and the like.
[0033]
The polylactone-based polyester polyols include polycaprolactone polyol,
poly43-methyl-8-valerolactone, and the like.
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The polycarbonate polyols can be obtained by reacting a diol compound with a
carbonate compound. The diol compound includes 1,3-propanediol, 1,4-
butanediol,
1,6-hexanediol, diethylene glycol, polyethylene glycol, polypropylene glycol,
polytetramethylene glycol, and the like. The carbonate compound includes
phosgene,
dialkyl carbonate, diphenyl carbonate, and the like.
[0034]
The polyolefin polyols include polybutadiene polyol, polyisoprene polyol, and
the
like.
[0035]
The polyol is particularly preferably polyether polyols. Polyether-based
thermosetting urethanes formed from the polyether polyols have excellent
hydrolysis
resistance as compared with polyester-based polyurethanes formed from
polyester polyols,
and therefore show small aged deterioration even after long-term use, and have
excellent
bending durability.
[0036]
The polyol may be used together with a low molecular weight polyol. The low
molecular weight polyol includes, for example, aliphatic diols such as
ethylene glycol,
1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol,
2-buty1-2-ethy1-1,3-propanediol, 1,3-butanecliol, 1,4-butanediol, neopentyl
glycol
(2,2-dimethy1-1,3-propanediol), 2-isopropyl-1,4-butanediol, 3-methyl-2.4-
pentanediol,
2,4-pentanediol, 1,5-pentanediol, 3-methy1-1,5-pentanediol, 2-methyl-2,4-
pentanediol,
2,4-dimethy1-1,5-pentanediol, 2,4-diethyl-1.5-pentanediol, 1,5-hexanediol, 1,6-
hexanediol,
2-ethy1-1,3-hexanediol, 2-ethyl-1,6-hexanediol, 1,7-heptanediol, 3,5-
heptanediol,
1,8-octanediol, 2-methty1-1,8-octanediol, 1,9-nonanediol, and 1,10-decanediol;
alicyclic
diols such as cyclohexanedimethanol (for example, 1,4-cyclohexanedimethanol),
cyclohexanediol (for example, 1,3-cyclohexanediol or 1,4-cyclohexanediol), and
2-bis(4-hydroxycyclohexyl)-propane; and trivalent or more polyols such as
trimethylolethane, trimethylolpropane, hexytols, pentytols, glycerin,
polyglycerin,
pentaerythritol, dipentaerythritol, and tetramethylolpropane.
[0037]
As the polyisocyanate, for example, aromatic isocyanates, aliphatic
polyisocyanates, alicyclic polyisocyanates, carbodiimide-modified
polyisocyanates of each
of the above polyisocyanates, isocyanurate-modified polyisocyanates of each of
the above
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polyisocyanates, and the like can be used in one kind alone or as a
combination of two or
more kinds thereof.
[0038]
The aromatic isocyanates include 2,4-tolylene diisocyanate (2,4-TDI),
2,6-tolylene diisocyanate (2,6-TDI), 4,4'-diphenylmethane diisocyanate (4,4'-
MDI),
2,4'-diphenyl-methane diisocyanate (2,4'-MDI), 1,4-phenylene diisocyanate,
xylene
diisocyanate (XDI), tetramethylxylene diisocyanate (TMXDI), polymethylene
polyphenylene polyisocyanate, tolidine diisocyanate (TODI), 1,5-naphthalene
diisocyanate
(NDI), and the like.
[0039]
The aliphatic polyisocyanates include hexamethylene diisocyanate (HDI),
trimethylhexamethylene diisocyanate (TMHDI), lysine diisocyanate, norbornene
diisocyanate methyl (NBDI), and the like.
[0040]
The alicyclic polyisocyanates include transcyclohexane-1-4-diisocyanate,
isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate (H6XDI,
hydrogenated XDI), dicyclohexylmethane diisocyanate (H12MDI, hydrogenated
MDI),
and the like.
[0041]
As the curing agent, curing agents generally used when forming a thermosetting
polyurethane elastomer can be used. Kinds of an active hydrogen group of the
curing
agent include, for example, a hydroxyl group, an amino group, an imino group,
a carboxyl
group, a urethane group, a thiol group, an epoxy group, and the like. As the
curing agent,
specifically, 4,4'-methylenebis(o-chloroaniline) (MOCA), 4,4'-
methylenedianiline (MDA),
and the like can be used.
[0042]
The thermosetting polyurethane elastomer may contain additives such as a
plasticizer, a coloring agent, an antioxidant, a filler, a hydrolysis
inhibitor, a reaction
accelerator, a releasing agent, and a flame retardant as necessary. However,
it is preferred
that a plasticizer is not added to the thermosetting polyurethane elastomer
used in the vane
member body 21 of the present embodiment.
[0043]
In the present embodiment, a part of the core wire 25 is embedded inside the
body
part 23 of the vane member body 21 as illustrated in (b) of Fig. 1 and (a) of
Fig. 3. The
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remaining part of the core wire 25 may be exposed to the outside. The whole of
the core
wire 25 may be embedded inside the vane member body 21. In the present
embodiment,
a plurality of the core wires 25 are embedded side by side along the shaft
direction G of the
rotating shaft 11. A plurality of the core wires 25 are preferably arranged
side by side in
the shaft direction G of the rotating shaft 11 such with an interval Ld
between the adjacent
core wires 25 being in a range of 0.25 to 0.50 mm as illustrated in (b) of
Fig. 3. The
interval Ld between the adjacent core wires 25 is more preferably in a range
of 0.25 to 0.30
mm.
[0044]
The core wire 25 includes a polyester fiber. The core wire 25 may be a twisted
yarn of polyester fibers and may be an untwisted yarn including a single
filament. The
polyester fiber has excellent heat resistance and strength. In other words, in
the case
where the core wire 25 including a polyester fiber is embedded in the vane
member 20,
bending durability of the vane member 20 to breakage is improved. The fineness
of the
core wire 25 is preferably in a range of 100 to 300 deniers. The core wire
diameter is
preferably in a range of 0.10 to 0.19 mm. The core wire 25 is preferably a
twisted yarn
having a fineness of 120 to 180 deniers. The core wire can contain fibers
other than the
polyester fiber.
[0045]
The vane member 20 is preferably formed so as to have a length in a radial
direction of the rotating shaft 11 being 15 to 50 mm, a length (width) in the
shaft direction
G of the rotating shaft 11 being 2 to 10 mm, and a length (thickness) in a
circumferential
direction of the rotating shaft being about 1 to 4 mm.
[0046]
(Production method of vane member)
The production method of the vane member 20 will be described below. The
vane member 20 may be produced by casting using a cylindrical mold including a
double
cylindrical mold or a flat mold as a split mold.
[0047]
First, the production method of the vane member 20 using a cylindrical mold is
described.
The cylindrical mold is a double cylindrical mold including an inner
cylindrical
mold and an outer cylindrical mold. The inner cylindrical mold is constituted
so as to be
capable of being arranged inside the outer cylindrical mold. Depressions to
form the base
13
CA 03044655 2019-05-22
22 and a plurality of convex portions 24 are formed on the outer peripheral
surface of the
inner cylindrical mold.
(1) The core wire 25 is wound on the outer peripheral surface of the inner
cylindrical mold. In this case, the core wire 25 is wound such that the
interval between
the adjacent core wires 25 has a predetermined distance.
(2) The inner cylindrical mold is inserted in the outer cylindrical mold so as
to be
arranged nearly concentrically.
(3) A liquid material to form the vane member body 21 is cast into a space
formed
between the inner cylindrical mold and the outer cylindrical mold. The liquid
material is
heated to thermally cure, thereby forming the base 22, the body part 23 and a
plurality of
convex portions 24, each including a polyurethane elastomer.
(4) The cylindrical vane member precursor obtained by demolding from the
cylindrical mold is cut to obtain the vane member 20.
[0048]
Next, the production method of the vane member 20 using the flat mold is
described.
The flat mold is a split mold of a first flat mold and a second flat mold.
(1)A plurality of the core wires 25 are fixed and arranged to the first flat
mold in
side-by-side state. In this case, the core wires 25 are arranged such that the
interval
.. between the adjacent core wires 25 has a predetermined distance.
(2) The second flat mold is adjusted and arranged to the first flat mold
having the
core wires 25 fixed thereto.
(3)A liquid material to form the vane member body 21 is cast inside the flat
mold.
The liquid material is heated to thermally cure, thereby forming the base 22,
the body part
23 and a plurality of convex portions 24, each including a polyurethane
elastomer.
(4) The vane member 20 is obtained by demolding from the flat mold.
In the production method using the flat mold, the vane member 20 may be formed
one by one, and a set of a plurality of the vane members 20 may be formed. In
this case,
the flat mold having a size that can form a set of a plurality of the vane
members 20 is
used. The set formed is cut into a predetermined size, to thereby obtain a
plurality of
vane members 20.
[0049]
The vane member 20 for the paper sheet-conveyance impeller 1 of the present
embodiment has the following characteristics.
14
CA 03044655 2019-05-22
At least one the vane member 20 for the paper sheet-conveyance impeller 1 is
arranged so as to protrude from the outer peripheral surface of the
cylindrical member 10
along a radial direction orthogonal to the shaft direction G of the rotating
shaft 11 of the
rotatable cylindrical member 10. The vane member 20 for the paper sheet-
conveyance
impeller 1 is brought into contact with paper sheets to convey those.
The vane member 20 for the paper sheet-conveyance impeller 1 includes the vane
member body 21 and the core wires 25. The vane member body 21 includes a
thermosetting polyurethane elastomer. The core wire 25 includes a polyester
fiber. At
least a part of the core wire 25 is embedded inside the vane member body 21
along a radial
direction of the rotating shaft 11. A plurality of the core wires 25 are
arranged side by
side in the shaft direction G of the rotating shaft 11 of the cylindrical
member 10.
For the vane member body 21, elastomer materials having excellent elasticity
are
preferable from the standpoint of restorability, and of the elastomer
materials, a
thermosetting polyurethane elastomer has particularly excellent abrasion
resistance and
elasticity. The polyester fiber forming the core wire 25 has excellent heat
resistance and
strength. For the core wire 25, a polyester fiber, an aramid fiber and a nylon
fiber are
preferable from the standpoint of bending durability, and a polyester fiber
that is difficult to
buckle against plastic deformation is particularly suitable.
In the case where the vane member body 21 includes a thermosetting
polyurethane elastomer and the core wire 25 includes a polyester, deformation
force
(compressive force) generated inside the core wire 25 when bending can be
reduced and
bending durability and restorability of the vane member 20 are enhanced. In
other words,
the vane member 20 for the paper sheet-conveyance impeller I can suppress
plastic
deformation and enhance bending durability and restorability.
[0050]
In the vane member 20 for the paper sheet-conveyance impeller 1 of the present
embodiment, the fineness of the core wire 25 is preferably in a range of 100
to 300 deniers.
In this case, the diameter of the core wire 25 is preferably in a range of
0.10 to 0.19 mm.
Furthermore, the fineness of the core wire 25 is more preferably in a range of
120 to 180
deniers. In other words, the diameter of the core wire 25 is relatively small.
In the case
where the diameter of the core wire 25 is large, the deformation force
(compressive force)
inside the core wire 25 (particularly, a vicinity of the outer peripheral
part) is increased
when bending as compared with the case where the diameter of the core wire 25
is small,
and buckling and breakage are easy to occur. Therefore, by making the diameter
of the
CA 03044655 2019-05-22
core wire 25 relatively small, the deformation force (compressive force)
generated inside
the core wire 25 when bending can be reduced and bending durability and
restorability are
improved. In other words, the vane member 20 for the paper sheet-conveyance
impeller I
of this constitution can suppress plastic deformation and further enhance
bending
durability and restorability.
[0051]
In the vane member 20 for the paper sheet-conveyance impeller I of the present
embodiment, it is preferred that the vane member body 21 includes a
thermosetting
polyurethane elastomer containing a plasticizer and the amount of the
plasticizer is 20 parts
by mass or less per 100 parts by weight of the thermosetting polyurethane
elastomer. It is
more preferred that the vane member body 21 includes a thermosetting
polyurethane
elastomer containing a plasticizer and the amount of the plasticizer is 5
parts by mass or
less per 100 parts by weight of the thermosetting polyurethane elastomer. The
vane
member body 21 preferably includes a thermosetting polyurethane elastomer
containing no
plasticizer. In the case where a large amount of a plasticizer is contained in
the vane
member body 21, the plasticizer bleeds out in the course of repeated contact
of the vane
member body 21 with paper sheets in long-term use, and transfers on the
surfaces of paper
sheets. As a result, the vane member body 21 contacting paper sheets
plastically deforms
and warpage of the vane member 20 occurs. Therefore, in the case where the
amount of
the plasticizer contained in the vane member body 21 is decreased or the vane
member
body 21 does not contain the plasticizer, warpage of the vane member 20 is
relatively
reduced and restoring force is improved. In other words, the vane member 20
for the
paper sheet-conveyance impeller 1 of this constitution can suppress plastic
deformation
and further enhance bending durability and restorability.
[0052]
The expression "the thermosetting polyurethane elastomer contains no
plasticizer"
means that a plasticizer is not substantially contained in the thermosetting
polyurethane
elastomer. The expression "is not substantially contained" used herein means
that the
plasticizer is allowed to be contained as impurities but is not intentionally
added.
[0053]
In the vane member 20 for the paper sheet-conveyance impeller 1 of the present
embodiment, a plurality of the core wires 25 are preferably arranged side by
side in the
shaft direction of the rotating shaft 11 such that the interval between the
adjacent core
wires 25 is in a range of 0.25 to 0.50 mm. A plurality of core wires 25 are
more
16
preferably arranged side by side in the shaft direction of the rotating shaft
11 such that the
interval between the adjacent core wires 25 is in a range of 0.25 to 0.30 mm.
In the case
where the interval between the adjacent core wires 25 is less than 0.25 mm,
the number of
core wires 25 to be embedded inside the vane member body 21 is increased. As a
result,
rigidity of the vane member 20 is increased and flexibility of the vane member
20 is
decreased. In the case where the interval between the adjacent core wires 25
exceeds 0.50
mm (particularly, 0.30 mm), the number of the core wires 25 to be embedded
inside the
vane member body 21 is decreased. As a result, there is a possibility that
deformation force
generated inside the core wires 25 when bending cannot be sufficiently
reduced. For this
reason, in the case where the interval between the adjacent core wires 25 is
in a range of
0.25 to 0.50 mm (particularly, in a range of 0.25 to 0.30 mm), the flexibility
of the vane
member 20 can be appropriately maintained. In other words, the vane member 20
for the
paper sheet-conveyance impeller 1 of this constitution can suppress plastic
deformation and
further enhance bending durability and restorability.
[0054]
The embodiment of the present invention is described above based on the
drawings,
but it should be understood that the specific constitution is not limited to
those embodiments
and examples.
[0055]
In the above embodiment, the vane member 20 is arranged so as to linearly
protrude
from the outer peripheral surface of the cylindrical member 10 along a radial
direction
orthogonal to the shaft direction G of the rotating shaft 11 of the
cylindrical member 10.
However, the structure of the vane member 20 is not limited to this. For
example, the vane
member may have a shape curved along the radial direction. Alternatively, the
vane
member 20 may be arranged inclining at a predetermined angle in the radial
direction. The
predetermined angle is optionally set to a range of, for example, 0 to 90 . In
the case of the
vane member arranged inclining at a predetermined angle in the radial
direction like above,
an angle may be provided on the notch portion of the cylindrical member and
the body part
of the vane member body may have a bending point. In the case where the body
part of the
vane member body has a bending point, the position of the bending point may
be, for
example, a vicinity of a connecting part to the base.
[0056]
17
CA 3044655 2020-10-22
CA 03044655 2019-05-22
In the present invention, the number of the vane member 20 is not limited to
4.
The number of the vane member 20 is 1 or more. The vane member 20 may not be
arranged at equal intervals in the circumferential direction R of the rotating
shaft of the
cylindrical member 10.
[0057]
In the present invention, the cylindrical member 10 is not limited to a nearly
cylindrical shape. The cylindrical member 10 may be formed into a nearly
polygonal
shape. The cylindrical member 10 may not have a shaft hole 13 in which the
rotating
shaft 11 is inserted. In other words, for the cylindrical member 10, the
rotating shaft 11
and the base 12 may be formed integrally.
[0058]
In the present invention, the notch portion 14 may not be formed so as to open
to
the shaft hole 13. The notch portion 14 may be formed so as to open to any one
of an
upper surface 12a and a bottom surface 12b. The notch portion 14 may be formed
so as
to open to the upper surface 12a and the bottom surface 12b.
[0059]
In the present invention, the shape of the base 22 may not be a nearly
semicircular
shape. The shape of the base 22 may be any shape such that the vane member 20
does
not detach in a radial direction of the rotating shaft 11 from the notch
portion 14. The
shape of the base 22 may be, for example, a shape such as concavo-convex
shape.
[0060]
In the present invention, a part of the core wire 25 is embedded inside the
vane
member body 21, and the remaining part may be exposed to the outside. The
whole of
the core wire 25 may be embedded inside the vane member body 21.
EXAMPLES
[0061]
Examples of the present invention are described below.
In the examples, 15 vane members 20 for a paper sheet-conveyance impeller of
Examples 1 to 15 and 9 vane members 120 for a paper sheet-conveyance impeller
of
Comparative Examples 1 to 9 were prepared. In the vane members 20 for a paper
sheet-conveyance impeller of Examples 1 to 9 and the vane members 120 for a
paper
sheet-conveyance impeller of Comparative Examples 1 to 8, a polyurethane raw
material
composition obtained by mixing under stirring: a liquid raw material obtained
by adding
18
CA 03044655 2019-05-22
20 parts by mass of dioctyl phthalate (DOP) as a plasticizer to 100 parts by
mass of a
polyether-based urethane prepolymer, followed by mixing under stirring the
resulting
mixture at 60 C; and a liquid raw material obtained by dissolving 10 parts by
mass of
3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA) as a curing agent at 120 C,
was used
as a liquid polyurethane raw material composition to form the vane member body
21 of the
vane member 20. In the vane members 20 for a paper sheet-conveyance impeller
of
Examples 10, 11 and 12, polyurethane raw material compositions in which the
amount of
the plasticizer added was 10, 5 and 0 parts by mass were used respectively in
place of the
polyurethane raw material composition in which the amount of the plasticizer
added was
20 parts by mass, used in the vane member 20 for a paper sheet-conveyance
impeller of
Example 1. In the vane members 20 for a paper sheet-conveyance impeller of
Examples
13, 14 and 15, polyurethane raw material compositions containing no amount of
the
plasticizer (0 part by mass) were used in place of the polyurethane raw
material
compositions in which the amount of the plasticizer added was 20 parts by
mass, used in
the vane members 20 for a paper sheet-conveyance impeller of Examples 2, 3 and
5,
respectively. In the vane member 120 for a paper sheet-conveyance impeller of
Comparative Example 9, an unvulcanized rubber sheet obtained by adding 0.5
parts by
weight of sulfur, 20 parts by mass of dioctyl phthalate (DOP) as a plasticizer
and a
vulcanization accelerator to 100 parts by weight of hydrogenated nitrile
rubber (N-NBR),
followed by conducting rubber kneading thereto was used. The vane members 20
for a
paper sheet-conveyance impeller of the Examples and the vane members 120 for a
paper
sheet-conveyance impeller of the Comparative Examples have the same
constitution as in
the vane members 20 for a paper sheet-conveyance impeller of the above-
described
embodiments except that the material and fineness of the core wire 25 and the
interval
between the adjacent core wires were changed.
[0062]
The vane members 20 for a paper sheet-conveyance impeller of the Examples and
the vane members 120 for a paper sheet-conveyance impeller of the Comparative
Examples were produced using a cylindrical mold having a double cylindrical
mold. The
production process of the vane members 20 for a paper sheet-conveyance
impeller of the
Examples and the vane members 120 for a paper sheet-conveyance impeller of the
Comparative Examples 1 to 8 is as follows.
(1) The core wire 25 was spirally wound on the outer peripheral surface
of the inner
cylindrical mold such that the interval between the adjacent core wires 25 had
a
19
1
CA 03044655 2019-05-22
predetermined distance. The interval between the adjacent core wires 25 was
defined as a
cycle of the core wire.
(2) The inner cylindrical mold was inserted and arranged in
the outer cylindrical
mold.
(3) The polyurethane raw material composition was cast in a cavity of the
mold and
thermally cured at 115 C for 25 minutes.
(4) After demolding from the mold, the resulting cured
product was subjected to an
aging treatment at 70 C for 12 hours to thereby obtain a cylindrical vane
member
precursor.
(5) The cylindrical vane member precursor was cut in 3 mm width in a
direction
along the core wire 25. The cut product was further cut in 20 mm length in a
direction
orthogonal to the core wire 25, to thereby obtain a vane member for a paper
sheet-conveyance impeller.
(6) The vane members 20 and 120 obtained were attached to a
polyacetal-made
cylindrical member 10 to obtain a paper sheet-conveyance impeller 1.
The production process of the vane member 120 for a paper sheet-conveyance
impeller of Comparative Example 9 is that the steps (2) to (4) in the above
steps (1) to (6)
are replaced with the following steps.
(2a) The unvulcanized rubber sheet was wound on the core wire,
and the whole was
then arranged inside a cylindrical jacket of a vulcanizing apparatus having
the outer
cylindrical mold provided therein.
(3a) The whole was placed in a vulcanizer and vulcanized under
pressuring and
heating by the vulcanizing apparatus, to thereby form a cylindrical vane
member precursor.
(4a) After demolding from the mold, the cylindrical vane
member precursor was
obtained.
[0063]
Material and fineness of the core wires 25 of the vane members 20 for a paper
sheet-conveyance impeller of the Examples and the vane members 120 for a paper
sheet-conveyance impeller of the Comparative Examples were changed as follows.
The
material and fineness of the vane members 20 for a paper sheet-conveyance
impeller of the
Examples are shown in Table 1. The material and fineness of the core wires 25
of the
vane members 120 for a paper sheet-conveyance impeller of the Comparative
Examples
are shown in Table 2.
CA 03044655 2019-05-22
Examples 1, 4, 5. 8 to 12 and 15 and Comparative Example 9: Polyester fiber
(PET, No. 60 count, 150 deniers)
Examples 2 and 13: Polyester fiber (PET, No. 90 count, 100 deniers)
Examples 3 and 14: Polyester fiber (PET, No. 40 count, 300 deniers)
Example 6: Polyester fiber (PET, No. 100 count, 90 deniers)
Example 7: Polyester fiber (PET, No. 30 count, 450 deniers)
Comparative Example 1: Nylon fiber (66 Nylon, No. 60 count, 150 deniers)
Comparative Example 2: Nylon fiber (66 Nylon, No. 50 count, 210 deniers)
Comparative Example 3: Nylon fiber (66 Nylon, No. 40 count, 300 deniers)
Comparative Example 4: Aramid fiber (66 Nylon, No. 30 count, 450 deniers)
Comparative Example 5: Aramid fiber (para-aramid, No. 60 count, 150 deniers)
Comparative Examples 6 and 8: Aramid fiber (para-aramid, No. 45 count, 200
deniers)
Comparative Example 7: Aramid fiber (para-aramid, No. 30 count, 450 deniers)
[0064]
The cycles of the core wires 25 in the vane members 20 for a paper
sheet-conveyance impeller of the Examples and the vane members 120 for a paper
sheet-conveyance impeller of the Comparative Examples were changed as follows.
The
cycles of the core wires 25 in the vane members 20 for a paper sheet-
conveyance impeller
of Examples are shown in Table 1. The cycles of the core wires 25 in the vane
members
120 for a paper sheet-conveyance impeller of Comparative Examples are shown in
Table 2.
The cycle of the core wires 25 means an interval between the adjacent core
wires 25 as
described above.
Examples 1 to 3 and 6 and Comparative Examples 1 to 3, 5, 6 and 9: 0.3 mm
Example 4: 0.25 mm
Examples 5 and 7 and Comparative Examples 4 and 7: 0.5 mm
Example 8 and Comparative Example 8: 0.2 mm
Example 9: 0.7 mm
21
[0065]
Table 1
Ex. 1 Ex. 2 Ex. 3 Ex. 4
Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9
Poly- Poly- Poly- Poly-
Poly- Poly- Poly- .. Poly- .. Poly-
Material of body
urethane urethane urethane urethane urethane urethane urethane urethane
urethane
Material of core wire
Polyester Polyester Polyester Polyester Polyester
Polyester Polyester Polyester Polyester
Fineness of core wire (deniers) 150 100 300 150 150 90
450 150 150
Cycle of core wire (mm) 0.3 0.3 0.3 0.25 0.5 0.3
0.5 0.2 0.7
Amount of plasticizer added (part by
_
20 20 20 20 20 20
20 20 20
mass)
Presence of
At bending of No No No No No No
No No No g
about 70,000 breakage
.
Presence of
...
times No No No No No No
No No No
deformation
',J1
Yes (core Yes (core
At bending of Presence of Yes
(tip Yes (tip .
No No No No No
wire wire ,
about breakage
cracking) cracking) R
1,700,000
buckling) buckling)
Presence of
times No A B No A Yes No No No
deformation
Judgement 0 0 0 0 0
22
. .
[0066]
Table 2
Corn. Corn. Corn. Corn.
Corn. Corn. Corn. Corn. Corn.
Ex. 1 Ex. 2 Ex. 3 Ex. 4
Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9
Poly- Poly- Poly- Poly-
Poly- Poly- Poly- Poly-
Material of body H-NBR
urethane urethane urethane urethane urethane urethane urethane urethane
_ _
Material of core wire Nylon Nylon Nylon Nylon
Aramid Aramid Aramid Aramid Polyester
Fineness of core wire (deniers) 150 210 300 450
150 200 450 200 150
Cycle of core wire (mm) 0.3 0.3 0.3 0.5 0.3 0.3
0.5 0.2 0.3 -
_
Amount of plasticizer added (part
20 20 20 20 20 20
20 20 20
by mass)
9
Yes Yes Yes Yes Yes Yes 0
At bending Presence of (core (core
(core (core (core (core ...
No No No
of about breakage wire wire
wire wire wire wire
51
70,000 buckling) buckling)
buckling) buckling) buckling) buckling)
.
times Presence of
.
,
No No No -
- - - 5,
deformation _
Yes Yes Yes
At bending Presence of (core (core (core _
_ _ _
of about breakage wire wire wire
1,700,000 buckling) buckling)
buckling) _
times Presence of _ _ _ _ _
_ _ _
deformation
Judgement x x x x x x
x x x
23
CA 03044655 2019-05-22
[0067]
As shown in Tables 1 and 2, Examples Ito 9 are that the combination of the
material of the body and the material of the core wire is the combination of
"polyurethane
+ polyester". Comparative Examples 1 to 4 are that the combination of the
material of
the body and the material of the core wire is the combination of "polyurethane
+ nylon".
Comparative Examples 5 to 8 are that the combination of the material of the
body and the
material of the core wire is the combination of "polyurethane + aramid".
Comparative
Example 9 is that the combination of the material of the body and the material
of the core
wire is "hydrogenated nitrile rubber + polyester".
[0068]
The bending durability test and restorability test were conducted for the vane
members 20 for a paper sheet-conveyance impeller of the Examples and the vane
members
120 for a paper sheet-conveyance impeller of the Comparative Examples.
[0069]
The bending durability test was conducted for the vane members 20 for a paper
sheet-conveyance impeller of Examples 1 to 9 and the vane members 120 for a
paper
sheet-conveyance impeller of Comparative Examples 1 to 9. A test apparatus 30
illustrated in Fig. 4 was used in the bending durability test. The test
apparatus 30 of the
bending durability test is that a motor 31 is connected to a slide base 32 of
a stainless steel
sheet through a bar 33. The test apparatus 30 of the bending durability test
is constituted
such that the slide base 32 attached to the bar 33 reciprocates in the order
of arrow
directions of (a) of Fig. 4 and (b) of Fig. 4 by the rotation of the motor 31.
The vane
member 20 for a paper sheet-conveyance impeller of each of the Examples and
the vane
member 120 for a paper sheet-conveyance impeller of each of the Comparative
Examples
are attached to a fixing member 35. The vane member 20 for a paper sheet-
conveyance
impeller of each of the Examples and the vane member 120 for a paper sheet-
conveyance
impeller of each of the Comparative Examples are attached so as to be brought
into contact
with the slide base 32 and bend in the order of the arrow directions of (a) of
Fig. 4 and (b)
of Fig. 4 by a reciprocating motion of the slide base 32. The vane members 20
for a
paper sheet-conveyance impeller of Examples 1 to 9 and the vane members 120
for a paper
sheet-conveyance impeller of Comparative Examples 1 to 9 were subjected to a
reciprocating motion at a speed of 300 bending/min as one round trip being one
bending
using the test apparatus 30. The presence of breakage and plastic deformation
of the vane
member 20 for a paper sheet-conveyance impeller of each of the Examples and
the vane
24
CA 03044655 2019-05-22
member 120 for a paper sheet-conveyance impeller of each of the Comparative
Examples
at the bending of about 70,000 times and after the bending of about 1,700,000
times were
judged.
[0070]
The test results of the bending durability test of the vane members 20 for a
paper
sheet-conveyance impeller of Examples 1 to 9 are shown in Table 1. The test
results of
the bending durability test of the vane members 120 for a paper sheet-
conveyance impeller
of Comparative Examples 1 to 9 are shown in Table 2. In the bending durability
test,
presence of plastic deformation of the vane member for a paper sheet-
conveyance impeller
was judged based on the ratio of decrease of a length of the vane member for a
paper
sheet-conveyance impeller, and on whether the state of plastic deformation of
the vane
member for a paper sheet-conveyance impeller is bending or buckling. In the
bending
durability test, a length L 11 before the bending durability test of from the
center of the
cylindrical member 10 in a radial direction orthogonal to the shaft direction
G of the
.. rotating shaft 11 of the cylindrical member 10 to the tip of the vane
member 20, and an
apparent length L12 after the bending durability test of from the center of
the cylindrical
member 10 in the radial direction orthogonal to the shaft direction of the
rotating shaft 11
of the cylindrical member 10 to the tip of the vane member 20 were measured.
The ratio
of difference in the lengths of L11 and L12 was measured as the ratio of
decrease of a
length of the vane member. In the case where the decrease of a length of the
vane
member for a paper sheet-conveyance impeller is not observed, the plastic
deformation
was judged as "No". In the case where the decrease of a length of the vane
member for a
paper sheet-conveyance impeller was less than 2% and the state of plastic
deformation was
bending, the degree of plastic deformation of the vane member for a paper
sheet-conveyance impeller was judged as A. In the case where the decrease of a
length of
the vane member for a paper sheet-conveyance impeller was less than 2% and the
state of
plastic deformation was a buckling, the degree of plastic deformation of the
vane member
for a paper sheet-conveyance impeller was judged as B. In the case where the
decrease of
a length of the vane member for a paper sheet-conveyance impeller was 2% or
more and
the state of plastic deformation was a bending or buckling, the degree of
plastic
deformation of the vane member for a paper sheet-conveyance impeller was
judged as C.
The comprehensive evaluation to bending durability of the vane member for a
paper sheet
impeller was judged as follows. In the case where the vane member for a paper
sheet-conveyance impeller was not broken or was not plastically deformed, it
was judged
CA 03044655 2019-05-22
as 0. In the case where the vane member for a paper sheet-conveyance impeller
was not
broken but was slightly plastically deformed, it was judged as 0. In the case
where the
vane member for a paper sheet-conveyance impeller was broken but the degree of
breakage was not problem on practical use, it was judged as L. In the case
where the
vane member for a paper sheet-conveyance impeller was broken and could not be
practically used due to the damage, it was judged as X.
[0071]
As shown in Tables 1 and 2, the vane members 20 for a paper sheet-conveyance
impeller of Examples Ito 9 in which the combination of the material of the
body and the
material of the core wire was the combination of "polyurethane + polyester"
were that the
comprehensive evaluation was 0, 0 or L. On the other hand, the vane members
120 for
a paper sheet-conveyance impeller of Comparative Examples 1 to 9 in which the
combination of the material of the body and the material of the core wire was
the
combination other than the combination of "polyurethane + polyester" were that
the
comprehensive evaluation was x In other words, it could be confirmed that
the vane
members 20 for a paper sheet-conveyance impeller of Examples 1 to 9 in which
the
combination of the material of the body and the material of the core wire was
the
combination of "polyurethane + polyester" were excellent in bending durability
as
compared with the vane members 120 for a paper sheet-conveyance impeller of
Comparative Examples 1 to 9 with the other combination.
[0072]
Among the vane members 20 for a paper sheet-conveyance impeller of Examples
1 to 9, superiority or inferiority was compared by changing the fineness of
the core wire.
In comparison between the vane members 20 for a paper sheet-conveyance
impeller of
Examples 1, 2, 3, 6 and 7 in which the fineness of the core wire was changed,
the
comprehensive evaluation of the vane members 20 for a paper sheet-conveyance
impeller
of Examples 1,2 and 3 in which the fineness was in a range of 100 to 300
deniers was 0
or 0, and it could be confirmed that those vane members were excellent in
bending
durability than the vane members 20 for a paper sheet-conveyance impeller of
Examples 6
and 7. It is considered that the vane member 20 for a paper sheet-conveyance
impeller of
Example 6 is that since the fineness of the core wire was fine as 90 deniers,
the vane
member 20 could not maintain its rigidity and was easy to break, leading to a
slight tip
cracking. It is considered that the vane member 20 for a paper sheet-
conveyance impeller
of Example 7 is that since the fineness of the core wire was thick as 450
deniers,
26
CA 03044655 2019-05-22
deformation force inside the core wire when bending was large and buckling of
the core
wire was generated. Since the vane member 20 for a paper sheet-conveyance
impeller of
Example 7 used a thick core wire, the core wire could not be arranged in a
cycle of 0.3 mm
and the cycle of the core wire was set 0.5 mm. In other word, it could be
confirmed that
in the case where the fineness of the core wire of the vane member is small,
breakage and
plastic deformation are further suppressed.
[0073]
Among the vane members 20 for a paper sheet-conveyance impeller of Examples
1 to 9, superiority or inferiority was compared by changing the cycle of the
core wire. In
comparison between the vane members 20 for a paper sheet-conveyance impeller
of
Examples 1, 4, 5, 8 and 9 in which the cycle of the core wire was changed, the
comprehensive evaluation of the vane members 20 for a paper sheet-conveyance
impeller
of Examples 1,4 and 5 in which the cycle was in a range of 0.25 to 0.50 mm was
0 or 0,
and it could be confirmed that those vane members were excellent in bending
durability
than the vane members 20 for a paper sheet-conveyance impeller of Examples 8
and 9. It
is considered that the vane member 20 for a paper sheet-conveyance impeller of
Example 8
is that since the cycle of the core wire was dense as 0.2 mm, flexibility of
the vane member
was reduced and buckling of core wire was generated. It is considered that the
vane
member 20 for a paper sheet-conveyance impeller of Example 9 is that since the
cycle of
the core wire was wide as 0.7 mm, the vane member 20 could not maintain its
rigidity and
was easy to break, leading to a slight tip cracking. In other words, it could
be confirmed
that in the case where the cycle of the core wire of the vane member is
decreased, breakage
and plastic deformation are further suppressed.
[0074]
In the restorability test, the difference in restorability was confirmed by
changing
the amount of a plasticizer added. The restorability test was conducted for
the respective
vane members 20 for a paper sheet-conveyance impeller of Examples I, 2, 3, 5
and 10 to
15. A test
apparatus 40 illustrated in (a) of Fig. 5 was used in the restorability test.
The
test apparatus 40 of the restorability test is constituted so as to have a
motor (not
illustrated). The test apparatus 40 of the restorability test is that four
vane members 20
for a paper sheet-conveyance impeller of Example 1 and Example 3 are mounted
on the
cylindrical member 10 rotatably attached to the motor. In the restorability
test, the
respective paper sheet-conveyance impellers 1 of Examples 1, 2, 3, 5 and 10 to
15 were
rotated at 1000 rpm and the vane members 20 of the respective paper sheet-
conveyance
27
1
CA 03044655 2019-05-22
impellers of Examples 1, 2, 3, 5 and 10 to 15 were continuously brought into
contact with a
plain paper 41. (b) of Fig. 5 is a schematic view illustrating the shape of
the vane
member 20 before the restorability test, and (c) of Fig. 5is a schematic view
illustrating the
shape of the vane member 20 after the restorability test. In the restorability
test, a length
Li before the restorability test of from the center of the cylindrical member
10 in a radial
direction orthogonal to the shaft direction G of the rotating shaft 11 of the
cylindrical
member 10 to the tip of the vane member 20, and an apparent length L2 after
the
restorability test of from the center of the cylindrical member 10 in the
radial direction
orthogonal to the shaft direction of the rotating shaft 11 of the cylindrical
member 10 to the
tip of the vane member 20 were measured. The ratio of difference in the
lengths of Ll
and L2 was measured as a decreasing rate of the tip of the vane member
(hereinafter
referred to as "vane member tip decreasing rate"). The vane member tip
decreasing rates
in the respective restorability tests conducted for Examples 1, 2, 3, 5 and 10
to 15 are
shown in Table 3. Table 3 also shows the test results of the bending
durability test and the
restorability test.
28
_
[0075]
Table 3
Ex. Ex. Ex, Ex. Ex. Ex. Ex. Ex. Ex. Ex.
1 10 11 12 2 13
3 14 5 15
Material of body Polyurethane
Polyurethane , Polyurethane Polyurethane
Material of core wire Polyester
Polyester Polyester Polyester .
Fineness of core wire (deniers) 150 100
300 150
Cycle of core wire (mm) 0.3 0.3
0.3 0.5
Amount of plasticizer added (part by mass) 20 10 5 0 20 0
20 0 20 0 .
Presence of
No No No No No No No No No No
At bending of about breakage
70,000 times Presence of
No No No No No No No No No No ,0
, deformation
Bending
Presence of
Durability
No No No No No No No No No No
At bending of about breakage
.
,
.
1,700,000 times Presence of
No No No No A A B B A A
deformation
Judgement
0 0 0 0 0 0 0 0 0 0
Restorability Vane member tip decreasing rate
2.3% 1.9% 1.7% 1.4% 2.8% 1.8% 2.6% 1.7% 2.7% 1.9%
29
CA 03044655 2019-05-22
[0076]
The test results of the restorability test for the vane members 20 for a paper
sheet-conveyance impeller of Example 1 and Example 12 are shown in Fig. 6.
Pass
number shown in Fig. 6 is the number that the vane member 20 is brought into
contact with
a plain paper. In Fig. 6, an average value of four vane members was plotted as
the vane
member tip decreasing rate. As shown in Fig. 6, the vane member tip decreasing
rate
increases with increasing the pass number. This is due to that the vane member
20 that
was straight at first curves in one direction and plastically deforms (bending-
deforms) in an
arch shape by abrasion of the tip of the vane member 20 and the bending-
deformation
gradually increases. The improvement of restoring force means an increase in
the force
returning to an original straight shape after bending-deformation. In other
words, this
means that the difference in the length of the vane member 20 before the
restorability test
and after the test decreases. Therefore, it is understood from the test
results of the
restorability test shown in Fig. 6 that the tip decreasing rate of the vane
member 20 of
Example 12 to which a plasticizer is not added is smaller than that of the
vane member 20
of Example 1 to which a plasticizer was added. From the above, it could be
confirmed
that the restoring force was improved in the vane member 20 of Example 12 to
which a
plasticizer is not added than in the vane member 20 of Example I.
[0077]
As shown in Table 3, the vane member tip decreasing rate of each example
measured at the pass of 50,000,000 times is that the vane member 20 for a
paper
sheet-conveyance impeller of Example 1 was 2.3%, whereas the vane member 20
for a
paper sheet-conveyance impeller of Example 10 was 1.9%, the vane member 20 for
a
paper sheet-conveyance impeller of Example 11 was 1.7%, and the vane member 20
for a
paper sheet-conveyance impeller of Example 12 was 1.4%. It is understood from
those
that the tip deceasing rate decreases and the restorability is improved while
maintaining
bending durability, with decreasing the amount of the plasticizer. Similarly,
in the
comparison of the respective vane members 20 for a paper sheet-conveyance
impeller of
Examples 13, 14 and 15 that do not contain a plasticizer to the vane members
20 for a
paper sheet-conveyance impeller of Examples 2, 3 and 5 having different
fineness and
cycle of the core wire, it is understood that the tip decreasing rate of those
decreases and
restorability is improved.
[0078]
CA 03044655 2019-05-22
It was understood from the above that according to Examples and Comparative
Examples of the present invention, the vane member body of the vane member for
a paper
sheet-conveyance impeller is that a thermosetting polyurethane elastomer is
difficult to
plastically deform and can increase bending durability as compared with a
hydrogenated
nitrile rubber (H-NBR). In the case where the vane member body of the vane
member for
a paper sheet-conveyance impeller includes a thermosetting polyurethane
elastomer, the
following facts were found. It was understood that in the case where the core
wire of the
vane member is not nylon fiber nor aramid fiber, but is polyester fiber,
bending durability
can be enhanced. It was further understood that in the case where the cycle of
the core
wire of the vane member is 0.25 mm, 0.3 mm or 0.5 mm, rather than 0.2 mm or
0.7 mm,
plastic deformation is hard to occur and bending durability can be enhanced.
It was
further understood that in the case where the cycle of the core wire of the
vane member is
0.25 mm or 0.3 mm, rather than 0.5 mm, plastic deformation is hard to occur
and bending
durability can be enhanced. It was further understood that in the case where
the fineness
.. of the core wire of the vane member is 100 deniers, 150 deniers or 300
deniers, rather than
90 deniers or 450 deniers, plastic deformation is hard to occur and bending
durability can
be enhanced. It was further understood that in the case where the fineness of
the core
wire of the vane member is 150 deniers, rather than 100 deniers or 300
deniers, plastic
deformation is hard to occur and bending durability can be enhanced. It was
further
understood that the vane member body may contain a plasticizer in the
thermosetting
polyurethane elastomer, but the upper limit thereof is preferably 20 parts by
mass per 100
parts by weight of the thermosetting polyurethane elastomer. It was further
understood
that in the case where the vane member body does not contain the plasticizer
in the
thermosetting polyurethane elastomer, restoring force is improved.
[0079]
Therefore, it was understood that in the case where the vane member body is a
thermosetting polyurethane elastomer containing no plasticizer and the core
wire of the
vane member is polyester fiber, the vane member for a paper sheet-conveyance
impeller
can suppress plastic deformation and enhance bending durability. It was
further
.. understood that to further enhance bending durability, the fineness of the
core wire is in a
range of 100 to 300 deniers (more preferably in a range of 120 to 180 deniers)
and the
cycle of the core wire is in a range of 0.25 to 0.50 mm (more preferably in a
range of 0.25
to 0.30 mm).
[0080]
31
This application is based on Japanese Patent Application No. 2016-232864
filed on November 30, 2016 and Japanese Patent Application No. 2017-226925
filed
on November 27, 2017.
INDUSTRIAL APPLICABILITY
[0081]
In the case where the present invention is used, a vane member for a paper
sheet-conveyance impeller, in which plastic deformation is suppressed and
bending
durability is increased, can be provided.
DESCRIPTION OF REFERENCE NUMERALS AND SIGNS
[0082]
1 Paper sheet-conveyance impeller
10 Cylindrical member
11 Rotating shaft
Vane member
21 Vane member body
Core wire
G Shaft direction of rotating shaft of cylindrical member
32
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