Note: Descriptions are shown in the official language in which they were submitted.
~79~;
This invention relates to a paper web shearing
machine for use in shearing to a given length a variety of
paper webs, such as a roll paper for use in a reproducing
machine, on the surface of wh~ch paper an image or the like
has been printed, a roll paper for use in a passometer, or
other paper web and film sheets.
As a shearing machine for cutting to a given
size a variety of paper webs, such as a roll paper for use
in a reproducing machine, on the surface of which paper an
image or the like has been formed, a roll paper prepared
for use in a pa~someter, and other paper webs, there have
hitherto been used a scissors type shearing machine, a
vertically sliding type shearing machine, a slitter type
shearing machine or a reciprocably rotating type shearing
machine. However, difficulty has been encountered with
those shearing machines in that in case of a paper web D~ing
cut at a right angle to the travelling direction thereof,
such a paper web has to be stopped or the travelling speed
of such a paper web must be decelerated, because the cutting
would be impossible if such a paper web travels at a high
speed.
It is accordingly an object of the present invention
to provide a paper web shearing machine, which provides a
satis~actory performance in cutting a paper web which is
travelling at a low speed as well as at a high speed,~ and
which machine is reduced in size, free from impact, and
extended in service life. According t~ the present invention
the shearing machine is capable of cutting to a gi~ven size
a paper web which is travelllng at a high ~peed of more ;-
than 10 m/min.
~47~
It is another ob~ect of the present invention
to provide a paper web shearing machine, w~ich provides
a satisfactory performance in cutting a paper web which
is travelling at a low speed as well as a high speed, and
which is extended in service life of cutting edyes, and
reduced in size to a greater extent as a result of ~ ;
reduction in torque of a motor, which is required for
shearing.
It is a further object of the present invention ~
to provide a paper web shearing machine, which provides a :
satisfactory performance in cutting a paper web which is .:
travelling at a low speed as well as at a high speed, and
which machine is e~tended in service life of shearing edges ~...... ... ~,
less costly to manufacture, and does not require a high . .
assembly precision.
It is a still further object of the present
invention to provide a paper shearing machine, whi¢h .
provides a satisfactory performance in shearing a paper
web which is travelling at a low speed as well as at a ~ `
high speed, and which machine is axtended in service life
of shearing edges, free from impact at the time of
shearing, and inexpensive to manufacture.
In accordance with one aspect o~ the present ''! `~ ' ` '
invention, a full rotation type paper web sheaxing machine
is provided w~ich comprises: first means for rotating a ,~ ~:
rotary blade in one direction of rotation about an axis; ~;~
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second means for supporting a stationary blade with the
shearing edge in elastic contact with the shearing edge
of said rotary blade; third means, located adjacent to
one end of said rotary blade from which shearing operation
starts, for maintaining the shearing edge of said
stationary blade in position equal to the radius of rotation
of said shearing edge of said rotary blade; and fourth means
for smoothly guiding of said shearing edge of stationary blade,
throughout a full rotation of said rotary blade.
In accordance with further aspects of the present
invention, the third means includes a guide ring mounted
adjacent the shearing starting end of said rotary blade
concentrically therewith, said guide ring having a radius
equal to the radius of rotation of said shearing edge of
said rotary blade at the shearing starting end, said
shearing edge of said stationary blade contacting said
guide ring. In a preferred embodiment, the fourth means
includes a second guide member mounted adjacent the shearing
terminating portion of said rotary blade, said second guide
~ membcr having a volute configuration wi~h a radius at a
volute staxting point being equal to the radius of said
shearing edge of said rotary blade at the shearing
terminating portion and decreasing to a volute terminating ~ ~
point, wherein said shearing edge of stationary blade ~ -
contacts said second guide member. ~ ~
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1047916 ~ ~
In the Drawings:
Figs. 1 and ~ illustrate the operation of a recip-
rocably rotating type, paper web shearing device of the prior
art;
Fig. 3 is a fragmentary front view of a paper web -
shearing machine according to the present invention;
Fig. 4 is a fragmentary longitudinal cross sectiQnal,
front view of the shearing device according to the first
embodiment; ~ ~ ?
Fig. 5 is a fragmentary lateral cross sectional,
side view of the shearing d~vice of the first embodiment;
Figs. 6 and 7 are explanatory views showing the
operation of the shearing device~of the first embodiment;
.~
Figs. 8 and 9 diagramatically show the relationship -;
between rotary blade and a stationary blade o~ the shearing ~`
machine according to a second embodiment;
Figs. 10 and 11 diagramatically show the relationship ; ;~
between the rotary blade and the stationary blade of the ;
shearing machine according to a third embodiment;
ao Figs. 12 and 13diagramatically show the relationship
,:
between the rotary blade and the stationary blade o~ the
shearing machine of a fourth embodiment;
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Figs. 14 and lS diagramatically show the relationship
between the rotary blade and the stationary blade of the
shearing machine of a fifth em odiment;
Figs. 16 and 17 diagr~matically show the relationship
between the rotary blade and the stationary blade of the
shearing machine of a seventh embodiment; and
Fig. 18 is a fragmentary view of the rotary blade.
Recentlyl business machines~have been increased in the
.
running speed of mechanical parts other than a ~aper shearing
device, and thus there has arisen a demand for a paper shearing
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machine which is capable of cutting a paper web travelling at
a high speed.
One type of paper shearing machine of the prior art
will be outlined ~efore describing the present invention.
Referring for example to a reciprocably rotating ~ ;
type, paper web shearing machine shown in Figs. 1 and 2, a
rotary blade 1 starts rotating in the direction of an arrow,
to thereby cut a paper web 3 to a given size at the shearing edges
of the rotary blade 1 and a stationary blade 2. In this case,
before the rotary blade 1 is returned to its initial position
after completion of cutting of the paper web 3, the travelling ~ -~
paper web has ridden on the rotary blade 1 as shown in Fig. 2,
thus disabling the subsequent cutting. Thus, in a shearing
machine of the prior art, it has been impossible to cyclical-
ly cut to a given size a paper web which is travelling at a
speed of more than 3m/min.
Embodiments of the present invention will be referred -
to, in conjunction with the accompanying drawings.
Fig. 3 shows a shearing machine of an embodiment of
the present invention, in which the shearing machine is rotated ~ ;
by the medium o a clutch by means of a drive shaft, whereby ~ ~
a rotaxy blade effects one full turn to shear a paper web to ~ ~,
a given si~e.
Thus~ as illustrated in Fig. 3, the rotary blade 1 is `
supported by shafts 4 on support members 5, 6. The clutch 10,
consisting of friction plates 14 and 15 spaced by spring 16 and
energized by coil 17, effects rotation of shaft 4 by drive shaft
19 supported by support member 18, An insulating ring 11 is -~-
positioned on shaft 4 with a conductive strip 12, connected to
lead wires 13, on the outer periphery of the ring 11. A stop
means compris~ng pin 7 eccentrically fixed off-axis to the end
o shat 4 and connected by coil spring 9 to base 8 to
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utilize the tension of the spring 9. ~
Description w~ll be ~ven to the embodiments of a : :
shearing machine haviny a rotary blade 1 and a stationaxy blade
2, of the present invention. :
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1 Exalnple 1
Referring to Figs. 4 and 5, a rotor 21 has
a rotary blade 1 whose shearing edge 22 projects
from the outer peripheral surface of a rotor in
para].lel rela-ti.on to the axis C of the rotor, and a
gulde ring 23 mounted adjacent to one edge 22 of the
rotary blade 1. The rotor 21 -further has a collar
portion 24 which is jou:rnaled ln a bearing portion
26 and a driven shaft 25 which receives a drive force
by the medium of a clutch from an ele~tric motor.
The collar portion 24 is journaled in the bearing
26, so that the rotor 21 is free to rotate about tne
axis a theraof. The rotary blade 1 is secured to l~`
the rotor 21 with its shearing edge 22 in parallel -
to the axis C of the rotor 21. The guide ring 23
is secured to the rotor 21 in clobely contacting
relation to the shearing starting end of the edge 22,
with its radius in coincidence with the radius of th~ ~ ~
edge line 22 at the shearing starting point. A shank ~ ;
27 having a stationary blade 2 is mounted on a sup~
porting sha~t 28, and the edge 30 of -the stationary j ~`
blade 2 is brought into pressure-contac-t wi-th the edge
22 of the rotary blade about the shaft 28 by the i ~
action of springs 29. The stationary blade 2 is , -`
25 disposed with its edge 30 parallel to the axis C of , ,
the rotary blade as well as in cont~ct with the outer
peripheral surface of the guide ring 23. The in~er
shaft 25 rotates in a given direction and stops at a
fi~ed starting point after every turn of the rotor. ~ `
l`he peripheral speed of the edge 22 of the rotary
-- 6 -- ,
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1~47~6
1 blade 1 is set to a speed equal to or higher than a
travelling speed of a paper web 3, and the rotary
blade 1 is rotated in the s~Lme direction as that of
the travelling paper web 3. Operation of the shearing
~achinc will be rcferLed to, in conjunction with
Figs. 6 and 7. In the position shown in ~ig. 5, the ;
rotary blade 1 is maintained stationary, with its edge
22 located at a starting point, while the paper web
3 is -travelling in the direction of an arrow. So far
as the rotary blade 1 is maintained in that position,
the edge 30 of the stationary blade 2 is maintained
in pressure-con-tac-t with the outer periphery of the ;~
guide ring 23, thus leaving between the stationary
blade 2 and the rotor 21 a gap large enough to allow
passing of the travelling paper web 3. When the
rotary blade l starts rotating, then the edge 22 is
brought to a position sho~ in Fig. 6 in which same
contacts the edge 30 of the stationary blade 2, there-
by cutting -the paper web 3 to a given length. In ;
this case, the edge 22 of -the rotary blade 1 is
brought to smooth contact wi-th the edge 30 of the `; `
stationary blade 2, withou-t a risk of two edges causing
a bite therebetween. Fig. 7 shows the status of the ~ ;
shearing blades which have completed shearing, in ~-
which the edge 22 of the rotary blade 1 continues
rotation and the paper web 3 is travelling. After -
the completion of shearing, the guide ring 23 yet
urgcs the edge 30 of the stationary blade 2 do~mwards,
so that a passage for the paper web 3 is instanta-
neousl~ pro~rided between the rotor 21 and the edge
.
_ 7 _ ~
~47916
1 30 of the stationary blade 2. Since the peripheral
spced of the edge 22 of the rotary blade 1 is equal
to or hi.~her than the travelling speed of the paper
web 3, then a passage for a cut end of the paper sheet
3 is provided simultaneously wi.th shearing of the
paper. T~us, the shearing machine of the preserlt ~ ;
invention ensures the cutting of paper web 3 travellin~
at a low speed as well as at a hig}l speed. As an
electric motor which is to be connected to the inner
shaft 25 of the rotor 21, there may be used an
inexpensive DC or AC motor equipped with a fixed
point stopping device, which is commercially avail-
able in the market. ~hus, the shearing machine of
the present invention is reduced in size, but provides
a satisfactory shearing performance. ~urthermore,
the service lives of the edges of both blades may `~
be extended~ The shearing device shown in the
embodiment is essentially used for shearing a thin
paper web or a paper web of a narrow width.
`
mxample 2
~ s seen in ~igs. 8 and 9, the edge line 22
o~ ~he rotary blade 1 is inclined relative to the
axis C of the rotor in the vertical plane or formed
spirally in the circl~ferential direction, and the
guide rin~ 23 bears on the edge 30 of the stationary
blade 2. The edge 30 of the stationary blade 2 is
substanti.ally parallel to the a~is C of the rotary
bl~d~. q`h~ radiu~ of the ~otary blade 1, as mea~ured
o~ t~l~ axi~ a thereof to the she~ring edge 23 is
.
! . 1~47~3~L6
1 maintained equal over the entirc len~th of the rotary
.- . :
blade 1. ~ ~ '
:
-.
Example 3
As shown in Eigs. 10 and 11, the edge line ~ ;
5 22 of the rotary blade 1 is parallel to the axis C-~ ,
of the rotary blade, and the edge line 30 of the ` ~,
stationary blade 2 is inclined relati~e to the axis;''~; '`;~
C of the rotary blade in the horizontal plane.
In Example 1, both the edge line 22 of the ' ;`~
rotary blade 1 and the edge line 30 of the stationar~
blade 2 are parallel to the axis C of the rotary
blade, so that a shearing force will be given to ~ ''
these edges at a time over the entire length there~
'o~, thus dictating the use o~ an electric motor having ',~
15 a large torque. While in Examples ~ and 3j one of the ;'
, edge 22 of the rotary ~lade 1 and the edge 30 of the
stationar~ blade 2 is inclined with respect to the '~
other edge, such that cutting proceeds oontinuo~sly
~rom one side to another in the transverse direction , , ,~
20 of the paper web 3, thus red,ucing an area of cutting '
spot. This greatly reduces a torque required for ~; '`
an electric motor used. ' ``''
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. : : . :.
Example 4 , - ,; ;', ,
As seen in Figs.~12 and 13, the edge 22 o~
'25 the rotary blade 1 is inclined relatl~e to the axis ',,~
C of the rotary blade in the hori~ontal and vertical
~planes,` 90 that the radius of the rotary blade 1 as ~.
measured from the axis C ther~of ~o the edge 22 may ~ ~
.
9 ~ ~
,
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~o47~6
]. be .increased towards the shearing terrninating side of :
~he edge 22. The edge 30 of the statlonary blade 2
is parallel to the axis C of the rotary blade.
Example 5 .`` :
As seen i.n Figs. 14 and 15, the rotary blade
1 is secured to the rotor 21, with the edge line 22
inclined relative to -the axis C of the rotary blade
or curved in a velute form in the circumferential
direction, while the edge llne 30 of the stationary
10 blade 2 is inclined relative to -the axis C of the ~.
rotary blade in the vertical planes, so that the :~ `
height of the edge line 30 may be increased towards
the shearing terminating side thereof.
In -the sheari.ng machines of Examples 4 and `.
5, the edge 30 is smoothly brought into pressure~
contact with the edge 22 at the shearing starting : ` ~ ~ .
point, with the aid of the guide ring 23, and there-
af-ter the edge 22 presses the edge 30 sequentially
at -the cutting poin-ts while being maintained in pres- ;
s~re-contact therewith thereby completing the cu-tting
o~ the paper web 3.. ~hus, in these shearing machines,
a strict control for the precision in assem~ly is not :
required, and smooth cutting is ~erformed, irrespec-
tive of an error in finishing of blades or an error
in the assembly, if any, unlike the shearing machines
of Examples 1, 2 and 3. ~
:; :
Example 6 ~ .
The edge line 22 of the rotary blade 1 is ;
- 10 ~
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1 incline~ relativc to the axis C of the rotary blade
in the vertical plane, and the edge line 30 of the
.. ..
stationary blade 2 is inclined with respect to the
axis C of the rotory blade in the horizontal plane.
In this embod~nent, the inclination of the edge 22
relative to the axis C of the rotary blade and the ~ ~`
inclination of the edge 30 with respect thereto are
adjusted at the time of assembly, so that the rotary ;~
. ., ~. .
blade 1 may be rotated for cutting at a peripheral
speed equal to a travelling speed of the paper web,
whereby a torque required for an electric motor used `~
in reduced gradually in the course of the cutting,
as we h as there is obtained a cutting line making a
right angle to the travelling direction of the paper
15 web. ~ ;
Example 7 ; ;
As shown in Figs. 16 and 17, a guide piece
31 is provided in the example and other construcSion
remains the same as that of Example 5, in which the
edge 22 of the rotary blade 1 is inclined relative to
the axis C of the rotary blade in the vertical plane,
while the edge 30 of the stationary blade 2 is
inclined relative to the axis C of the rotary blade
in the horizontal and vertical planes, thereby
25 raisin~ the height of the edge line 30 towards the ~f.
shearing terminating side of the edge. The guide
- ~
piece 31 is secured to the rotary blade 1 in con-
tactin~ relation to the end of the ed~e 22 at the
shearing te~;minatin~ and th~reof. The guide piec~ 31
.
~L~)47916
1 presents a volute shaped outer contour, and has -the
maxin~llm radius at a volute starting point at the t
shearing terminating end of the edge 22. The radius
of the volute shaped guide piece 31, as measured from ~`
5 the axis C of the rotor to a ~olute start~ng point
at the shearing terminating end of the edge 22, is
equal to the radius of the edge 22 in the shearing
- terminating end and gradually decreases towards a
direction opposite to the rotating direction of the
10 rotary blade 1. At the time of the starti~g of cutting,
the decreasing rate of the radius of the guide piece
31 must at least acco~ odate itsell to the inclination
of the edge 30 over the entire leng-th of the blade
relative to the axis C of the rotor. In the event
15 that the former is less than the latter, then the
edge 22 fail~ to pressule-contact the adge 30, with
the failure of cutting. Upon completion of shearing,
the edge 30 is smoothly guided by -the guide piece
31 to divert itself from the ro-tary blade 1, through
20 the further rotation of the rotary blade 1, the edge
30 is carried at the opposite ends thereof by the
guide ring 23 and the guide piece 31 independently
o~ the edge 22, and thereafter, the edge 30 is smooth-
ly guided and withdrawn to the side o~ the guide
25 ring 23, thus being returned to the shearing starting
position, ~ith the freedom of impact. In the stage
succeeding thereto until termination o~ paper shearing,
the guide piece 31 is maintained independent of the
. .
motion of the blades. ~-;
In Examples 4 and 5, no ~uide means is
`, ','
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1 providcd for the edge 30 o~ thc stationary blade 2
a~-ter the completion o~ cutting, 50 that there is a
possibility that the shearing starting end of the ~ ~ -
ed~e 30 impinges on the guide ring 23 -to provide ;
impact, leading to a noi~ ~nd wear o~ the blade.
The shearing machine of E~ample 7, O11 the contrary,
is free ~rom a mechanical impact as well as a noisea
thus extending the service lives of the edges of
respective blades.
The above-described construc-tions may prac- ~ ;
tically be used in combination, so as to adjust the
relationship of the strength of. a paper ~eb to be
cut versus the torque o~ an electric motor used, or
to adjust a shearing angle relative to a paper web :~
to a right angle to the travelling direction of the
paper web.
In the embodiments shown, the guide ring
23 is rigid with the end of the shearing starting
portion of the rotary blade 1 and pressure-contac-ts
the sharp edge 30 of the stationary blade 2 made cf
A high-hardness material, so -that the g~ide ring 23
must be made o-~ a high-hardness material as hard as
.
that of the edge 30 and must be given a suf iciently
wide contacting areaO Yet in -this embodiment, the `
25 contacting area of the gui.de ring 23 is relatively
small and becomes inevitably worn d~e to friction
during the long service Or the shearing machine.
The short ser~i.ce life of a paper web shearing
machine, in most cases, is due to progress of we~r
o~ the guide ring 23, rather th~n w~ar o:~ the shearing
~ ` .
- ~3 - ~
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1 ed~e 30.
Example 8 '~
Referring to Fig. 18, the guide ring 23 is
rotltably mounted on a shaft 32 of the rctary blade
5 at the shearing starting end thereof and locked by ,~
a E-ring 3~ so as not to be slipped off the shaft 32.
When the edge 22 of the rotary blade 1 is rotated,
'then the guide'ring 23 is caused to slide on the
inner circumferential surface'34 relative to the shaft ~'-
10 r~2, and hence does not cause friction relative to ~ ,
the edge 30 of the stationary blade. With the con-
struction described, no friction arises in the area
of the guide ring 23 contacting the edge 30 of the ~ ~ Y
stationary blade. ~he area o~ the inner circumfer~
15 ential surface 34 of the guide ring 2~ is increased ~ ~ ;
to a'large extent'so as to provide a sufficient
~ontacting area relative to the shaft 32. This ' ~,
allows easy lubrication and suppresses the progress
o~ wear in that area. ~ ,
Where the guide r,ing 2r~ is rieid with the , ~ "
shaft 32 o~ the rotary blade 1, the guide ring 23 ~;
~hould be made of a material having hardness as high
as that of a material of the edge 30 of the stationary
blade and provide a sufficiently ~ide contacting ~,
25 area. While in this example, a high hardness material ~'
should not necessarily used for a material of the
guide ring. For example,~a low haldness ma~erial,
such as sintered oil-impregnated copper-system alloy, ' ~,
m~y b~ used as a material,o~ ~h~ ~uide rin~ 2~ and' '~;'',
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1 lubrication may be applied bctween the inner circum-
ferential surface 3~ of the guide ring 23 and the
shaft ~2.
- - A test was carried out, first, for a
shearin~ machine using a guide ring fixedly mol~lted
on the shaft of the rotary blade, which guide ring is
made of high speed steel and subjected to the heat
treatment to obtain a Rockwell hardness of 60, provid-
ing a width of 3 mm. After one million and twenty
thousand cycles of shearing, a depth of wear o the
contacting surface of the guide ring rela~ive to the
edge of the stationary blade was found ~o be 0.08 ~m
and the torque for driving the rotary blade was
increased by ~0~0 approximately, with the result that
the shearing machine disables *urther running.
Another test was carried out for a shearing machine
usin~ a rotatable guide ring, in which a sintered
oilless bearing (JIS SKB 12187 bronze) was used for
the guide ring and the guide ring having a width of ;~
3 mm was u~ed. After two million cycles of shearing,
the shearing machine could yet continue running with-
out trouble. q`he test results show that the guide
ring rotatably mounted on the shaft of the rotary
blade insures a long service life for the shearing
machine.
Throughout the e~amples shown, the rotor
.
of a cylindrical shape has been disclosed, but may
be of any shape other than that. q'he ]eaf spring
is used for urging the stationary blade to the guide
~0 rin~. ~Iowe~r, such a spring may be mad~ of other
,~.
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1~4791~i
clas ti.c member or OI a ma~netically ~c tuated elastic
member.
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