Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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LOG FEED ROLL AND FLUTE ATTACHMENT
FIELD OF THE INVENTION
The present invention relates to a feed roll, and more particularly to a feed
roll
for displacing a log of wood and a flute attachment for the feed roll.
BACKGROUND OF THE INVENTION
It is well known in the art to use feed rolls in the process of debarking,
i.e.
removing bark, from logs. Typically, such feed rolls are driven, by a motor or
the like, and are situated at the input and output of debarkers for driving
the logs
through the debarker. Generally, two sets of flutes, each flute of one set
having
a corresponding flute on the other set with the corresponding flutes
converging
at inner portions thereof towards a central portion of the roll, are shaped to
provide a recess in which the logs are supported and to grip and propel the
logs
through the debarker by rotation of the roll. As the log is generally
supported
and gripped through the inner portions, it is these portions that must provide
most of the support and traction for advancing the log. Accordingly, these
inner
sections often have gripping members for gripping the log. At the same time,
since the inner portions provide most of the support and traction, it is these
inner portions, including the gripping members, that are most susceptible to
wear and tear. Thus, the inner portions, and sometimes the entire flutes,
must,
eventually, be replaced. In traditional feed rolls, this necessitates removing
the
entire roll for replacing the flutes or inner sections thereof, which is,
obviously,
time consuming and inefficient, especially since the flutes are typically
welded to
the roll.
One solution for facilitating replacement and repair of flutes is to provide
flutes
for which at least a portion, and notably the inner flute portion which
supports
and grips the logs, are replaceable. For example, US patent 6,253,813 issued
to Kube et al. on July 3, 2001 provides a feed roll in which there are
removable
flute attachments which are removably fastened on one side wall of the inner
portions of the flutes and which have gripping members extending thereabove.
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The flute attachments are attached with screws which extend through apertures
in the flute attachment into threaded flute apertures, i.e. sockets, which
extend
through the inner portion of the flute. Thus, the attachments support and grip
the log, which reduces wear and tear on the inner portions and then are simply
moved and replaced when the attachments become worn. However, as the
attachments are only attached on one side of the inner portions, the stress on
the side to which the attachments are attached is disproportionate to that on
the
opposing side. Further, while the screws in Kube et al. are adapted for
extending precisely through the inner portion of the flute to the side wall
opposite the side wall to which the attachment is attached, this leaves little
support for holding the attachment in place on the side wall opposite to the
side
wall to which the flute is attached. Thus the screws undergo great stresses
and
become a weak point of the design. Finally, as the attachment is mounted and
extends alongside the inner flute portion in Kube, as opposed to covering the
top of the inner flute portion, the configuration taught in Kube offers little
protection for the top of the flute and the inner flute end, i.e. the end of
the flute
closest to the centre of the roll.
Accordingly, there is a need for an improved feed roll with replaceable flute
attachments that obviates the difficulties described above.
SUMMARY OF THE INVENTION
It is therefore a general object of the present invention to provide an
improved
feed roil for a log with a removable attachment therefor.
An advantage of the present invention is that the attachments provide
protection
for the top portions of the flutes.
Another advantage of the present invention is that the attachments provide
protection for both side walls of each flute.
A further advantage of the present invention is that the attachments provide
additional protection for the inner flute ends of the flutes with intersection
sections thereof that extend partially over the corresponding intersecting
inner
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flute end for enhanced traction for the log L at the inner flute ends as well
as
enhanced protection of the inner flute ends, which allows, in turn, for
improved
or increased traction for logs L that are smaller in circumference than that
provided by prior art rolls.
Yet another advantage of the present invention is that the attachments provide
for a stronger interface, due to the attachment design that provides for a
stable
'sitting' position thereof on the flute, with the flutes that makes the
securing
screws aside from the main operation load path acting on the flutes.
In a first aspect of the present invention, there is provided a feed roll for
displacing a log, comprising:
- a roll having a rotary axis;
- generally opposed first and second sets of flutes, for propelling the log,
attached to the roll on an outer surface thereof, the flutes within each set
being axially spaced apart relative one another and having generally
opposed side walls extending across the outer surface between
generally opposed inner and outer flute ends thereof, and
- for each flute, a removable flute attachment having a top attachment
section and generally opposed side braces extending therealong and
away therefrom, the side braces having at least one pair of axially
aligned brace apertures and the side walls having at least one flute
aperture extending therebetween, the removable flute attachment being
adapted for removable attachment to the flute with the top attachment
section extending thereover and with the side braces in contacting
engagement with the side walls and with the brace apertures and the
flute aperture in registered relationship for axial insertion of a fastening
means therethrough for releasably fastening the flute attachment on the
flute for contacting the log.
In a second aspect of the present invention, there is provided a removable
flute
attachment for a feed roll for a log, the feed roll having a rotary axis and
at least
one flute on an outer surface thereof, the flute having generally opposed side
walls with at least one pair of axially aligned flute apertures extending
through
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the side walls, the flute attachment comprising a top flute section and side
braces extending from the top flute section generally away therefrom, each
side
brace having at least one brace aperture adapted, when in registered
relationship with the flute aperture, for axial removable insertion of a
fastening
means therethrough for releasably fastening the flute attachment on the flute
with the side braces in abutment with the side walls.
Other objects and advantages of the present invention will become apparent
from a careful reading of the detailed description provided herein, with
appropriate reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Further aspects and advantages of the present invention will become better
understood with reference to the description in association with the following
Figures, in which similar references used in different Figures denote similar
components, wherein:
Figure 1 is a front view of a feed roll, having replaceable flute attachments,
for
displacing a log in accordance with an embodiment of the present invention;
Figure 2 is a side view of a flute for the feed roll shown in Figure 1;
Figure 3 is a front perspective view of a flute for the feed roll shown in
Figure 1;
Figure 4 is a top view of a flute for the feed roll shown in Figure 1;
Figure 5 is a perspective view of view of a removable flute attachment for the
feed roll of Figure 1;
Figure 6 is a side plan view the removable attachment shown in Figure 5;
Figure 7 is a front plan view of the removable attachment shown in Figure 5;
Figure 8 is a perspective view of view of another removable flute attachment
for
the feed roll of Figure 1;
Figure 9 is a front plan view of the removable attachment shown in Figure 5;
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Figure 10 is a side plan view the removable attachment shown in Figure 5;
Figure 11 is a front perspective view of a flute for the feed roll shown in
Figure 1
with the removable flute attachment shown in Figure 8 placed thereon; and
Figure 12 is a front perspective view of a flute for the feed roll shown in
Figure 1
5 with the removable flute attachment shown in Figure 5 placed thereon.
DETAILED DESCRIPTION OF THE INVENTION
Reference is now made to Figure 1, which shows a feed roll 10, for displacing
a
log L. Typically, the feed roll 10 is deployed for displacing the log L
towards, or
away from, a debarker, not shown. However, the feed roll may be used to feed
a log L towards, or away from, any implement, machine, or instrument for
performing an operation on the log L.
The feed roll 10 is a, preferably cylindrical, roll 10 having a rotary axis 14
around
which the roll 10 can be rotated either by hand or by a motor or the like. The
roll
10 is typically made out of a sturdy metal, such as iron, steel, or the like.
The
roll 10 has an outer surface 16 upon which, preferably, generally opposed
first
and second sets, shown generally as 18 and 20 of flutes 24, are securely
attached. The flutes 24 engage, i.e. support and grip, the log L while on the
roll
10 to guide and propel the log to and from the debarker, not shown, depending
on whether the roll 10 feeds the log L into the input of the debarker or
receives
the log L from the output of the debarker. Additionally, the flutes 24
facilitate
separation of the log L from the outer surface 16 of the roll 10, which
protects
the roll 10 and the outer surface 16.
Referring now to Figures 1, 2, 3 and 4, each flute 24, preferably, consists of
a
single piece of sturdy metal, such as iron, steel, or the like, and is
preferably
attached to the outer surface 16 by welding. The respective flutes 24a, 24b of
each respective set 18, 20 are axially spaced apart, relative axis 14, from,
and
preferably parallel to, the other flutes 24a, 24b in the same set 18, 20 on
the
outer surface 16 of the roll 10. Each flute 24 has a preferably rounded inner
flute end 26, situated proximal a central position, shown by axis 30, on the
outer
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surface 16, and a generally longitudinally opposed outer flute end 28,
situated
generally distal the central position 30 and proximal an outer edge 32 of the
outer surface 16, between which generally opposed side walls 34 of the flute
24
longitudinally extend. Thus, the flutes 24a, 24b of the first and second sets
18,
20 extend from their outer flute ends 36, situated respectively proximal the
first
and second outer edges 32a, 32b, transversely across the outer surface 16
towards their inner flute ends 26 situated proximal the central position 30.
Further, each flute 24 has an outer flute portion 36, situated proximal the
outer
flute end 28 and extending thereto, and an adjoining inner flute portion 38
situated proximal the inner flute end 26 and which extends to the outer flute
portion 36. Each flute 24 also has a top flute portion 40, i.e. a top flute
surface,
which extends between the side walls 34 from the inner flute end 26 to the
outer
flute end 28, the side walls 34 themselves extending generally outwardly from
the outer surface 16 to the top flute portion 40.
Each flute 24 from one set 18, 20 preferably has a corresponding flute 24 in
the
other set 18, 20. The outer flute ends 28 of each flute 24 and the
corresponding
flute 24, situated at opposing outer edges 32a, 32b are preferably
circumferentially aligned with one another at substantially the same
circumferential position on the roll 10, with their respective inner flute
portions
38 converging toward one an other, and preferably intersecting one another at
their respective inner flute ends 26 in proximity to the central position 30.
Further, the outer flute portion 36 is, preferably, angled, i.e. slanted,
relative the
rotary axis 14 in an axial direction towards the central position 30, as
schematically indicated by angle A in Figure 1. The inner flute portion 38 is,
at
an intersecting point 42 between the portions 36, 38 and which defines the
border therebetween, angled away from the axial direction at an angle B
greater
than that, angle A, of the outer flute portion 38. In other words, the flutes
24 are
slanted, relative the rotary axis 14, towards the central position 32 with the
inner
flute portion 38 of the flute 24 being slanted, at the intersecting point 42,
more
steeply towards the central position 30 than the outer flute portion 36. Thus,
each flute 24a and its corresponding flute 24b are, together, attached to the
outer surface 16 in a V-shaped configuration, shown generally as 44, extending
from the outer flute ends 28 thereof towards the inner flute ends 26 where the
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flutes 24 converge and preferably intersect, preferably with the side wall 34
of
one flute 24a extending at least partially across the inner flute end 26 of
the
corresponding flute 24b. Typically, the inner flute ends 26, preferably
intersecting, point towards, and are aligned with, the input or output of the
debarker to direct the log L, respectively, towards the input or away from the
output.
Additionally, and as best shown in Figures 1 and 2, the respective inner flute
portion 38 of each flute 24 is tapered inwardly, i.e. inclined, towards the
outer
surface 16 as it extends to the inner flute end 26. Thus, when their
respective
inner flute ends 26 intersect, each flute 24 and corresponding flute 24
together
form a log recess, shown generally as 46, in which the respective inner
portions
38, and notably the top flute portions 40 thereof, taper, i.e. incline,
towards the
outer surface 16 to the intersecting inner flute ends 26 thereof in proximity
to the
central position 30. The log L, or a portion thereof, is preferably situated
in the
log recess 46 to further guide the log L towards the debarker. Optionally, the
outer flute portions 36 may also be tapered, i.e. inclined, towards the outer
surface 16, preferably at a lower degree of incline, however, than the inner
flute
portions 38.
Reference is now made to Figures 1-3 and 5-10. At least one, and preferably
all, of the flutes 24 have a removable flute attachment 48 removably fastened,
i.e. mounted, thereupon with a fastening means, preferably on the inner flute
portion 38 of each flute 24. As best shown in Figures 5 and 8, each flute
attachment 48 for each flute 24 has a top attachment section 52 and generally
opposed side braces 54 extending at least partially alongside the top
attachment section 52 and away therefrom. The side braces 54 have at least
one pair, and preferably a plurality of pairs, of axially aligned brace
apertures 56
on opposing side braces 54. As shown in Figures 2 and 3, the side walls 34 of
each flute 24 have, for each pair of brace apertures 56, a corresponding pair
of
axially aligned flute apertures 58 for each pair of brace apertures 56,
defining a
corresponding flute channel 60 extending through the flute 24 from one side
wall 34 to the opposing side wall 34 thereof.
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Referring now to Figures 5 through 7, the top attachment section 52 for each
attachment 48 has a log engagement side 66 which, when the attachment 48 is
fastened to the flute 24, faces away from the outer surface 16 and towards the
log L for contacting the log L. As shown, for attachment 48a, the log
engagement side 66a may have gripping members 68 protruding outwardly
away therefrom, in a direction generally opposite that from which the side
braces 54 protrude from the top attachment section 52, for protruding into and
gripping the log L to provide additional traction for driving the log towards
or
away from the debarker. The gripping members 68 are, preferably, teeth or
spikes. However, any other gripping member 68 capable of gripping log may be
deployed. As shown in Figures 8-10, the log engagement section 66b may,
instead of having gripping members 68, be substantially planar and smooth, as
shown for attachments 48b. Gripping members 68, and attachments 48, are,
preferably, made out of a strong and resistant metal, such as iron, steel, or
the
like. Preferably, but optionally, one set 24a of flutes 24 will have
attachments
48a with gripping members 68, whereas the flutes 24 of the other set 24b will
not have gripping members 68 and will have top attachment sections 52,
notably log engagement sections 66b thereof, that are planar and smooth.
Reference is now made to Figures 2, 3, 11, and 12. The apertures 56, 58, and
channel 60 are configured, i.e. positioned sized and shaped, such that, when
each pair of brace apertures 56 is in registered relationship, i.e. axially
aligned,
with the respective corresponding flute apertures 58 therefor, a fastening
means
may be axially inserted through the apertures 56, 58 and channel for removably
and securely fastening the attachment 48 to the flute 24. At the same time,
side
walls 34 and side braces 54 are configured such that when the attachment 48 is
fastened with fastening means to flute 24, the side braces 54 extend at least
partially alongside side walls 34, preferably on the inner flute portion 38,
in
abutment therewith. Similarly, top attachment section 52 and top flute portion
40 are configured such that, when the attachment 48 is fastened with fastening
means to flute 24, a mating side 64 of top attachment section 52, situated
generally opposite the log engagement side 66, extends, preferably on the
inner
flute portion 38, over at least a portion of the top flute portion 40 in
abutment
therewith.
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Reference is now made to Figures 1, 2, 3, 6, 8, 11, and 12. To further assist
in
placement of the attachment 48 on the flute 24 with brace apertures 56 aligned
in registered relationship with their corresponding flute apertures 58, the
top
flute portion 40 has a recessed portion 62 extending therein towards the outer
surface 16 and the mating side 64 of the top attachment section 52 has a
mating section 65 which protrudes slightly outwardly between the side braces
54 relative the remainder of the mating side. The mating section 65 and
recessed portion 62 are configured such that, when with brace apertures 56
aligned in registered relationship with their corresponding flute apertures
58, the
mating section 65 extends into the recessed portion 62 and abuts the top flute
portion 40 therein, thus matingly engaging the top flute portion 40 in the
recessed portion 62 thereof. Preferably, the top attachment section 52 also
has
an end section 70, such as a lip or flange, which extends outwardly beyond the
side braces 54 and which is situated extending partially over the inner flute
end
26 when the attachment 48 is fastened to the flute 24. The end sections 70
are,
preferably, configured such that the end sections 70 of attachments 48 on
corresponding flutes 24 intersect with one another with one end section 70
extending at least partially over the other in abutment therewith. The end
section 70 may, if desired, have a gripping member 68 protruding therefrom,
thus insuring that the additional grip and traction provided thereby is
available
even in proximity to the innermost, i.e. most central relative to the roll 10,
portion
of the flute 24. Thus, the end sections 70 partially cover the inner flute
ends 26,
which typically undergo the greatest stress and contact with the log L during
use, and therefore reduce wear and tear on the inner flute ends 26. The fact
that the inner flute ends 26 are curved on an incline towards the outer
surface
16 further reduces contact between the inner flute ends 26 and the log L and
increases longevity of the flutes 24.
Reference is now made to Figures 2, 3, and 11. As best illustrated in Figure
11,
for each set of brace apertures 56 and corresponding set of flute apertures 58
and channel 60, the fastening means is, preferably, a threaded nut 72 and
threaded bolt 74. The apertures 56, 58, channel 60, and bolt 74 are configured
for axial insertion and extension of the bolt 74 through the brace apertures
56,
flute apertures 58, and channel 60, with the head 76 of the bolt 74 in
contacting
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engagement with one of the side braces 54. The nut 72 is engaged, i.e.
screwed on, to the bolt 74 on the opposing side brace 54 in abutting contact
therewith to immobilize the attachment 48 on the flute 24. Thus, the nut 72
and
bolt 74 tightly and securely retain the attachment 48 on the flute 24. The nut
72
5 can be subsequently disengaged, i.e. unscrewed, and the bolt 74 removed.
When all of the nuts 72 and bolts 74 for the apertures 56, 58 of a given flute
24
and attachment 48 therefor have been removed, the attachment 48 can be
removed and replaced. It should be noted that any other fastening means that
can be axially inserted and removed through the apertures 56, 58 and channel
10 60 for securely fastening and immobilizing the attachment 48 on the flute
24
may be deployed. For example, a member could be axially inserted through
apertures 56, 58, and channel 60 and then nuts or other securing means could
be engaged on opposing ends of the member in abutting engagement with the
side braces 52 to hold and immobilize the attachment 48 on the flute 24.
Referring again to Figure 1, as the attachments 48 are placed on the inner
flute
portions 38 of the flutes 24 of the two sets 24a, 24b, they are advantageously
situated in the log recess 46 and form part of the V-shaped configuration 44.
Accordingly, the attachments 48 cover the portion of the flutes 24 which have
the most contact with, and receive the most stress from, the log L. Thus, the
attachments 48 protect the flutes 24 from wear and tear and increase the
lifespan of the flutes 24 and the roll 10. At the same time, the attachments
48,
especially attachments 48a having gripping members 68, also provide traction
for moving the log L towards and away from the debarker. In particular, as the
attachments 48, i.e. intersection sections 70 thereof, extend partially over
the
intersecting inner flute ends 26 of the corresponding flutes 24 of the sets
18, 20,
the attachments 48 provide both enhanced traction for the log L at the inner
flute ends 26, as well as enhanced protection of the inner flute ends 26. This
provision of traction at the inner flute ends 26 allows, in turn, for,
improved, i.e.
increased traction for logs L that are smaller in circumference than that
provided
by prior art rolls 24 having attachments for which the which gripping members
66 extend from alongside the side walls 34 above the top flute portions 40 of
flutes 24. As stated previously, when the attachments 48 become worn, they
may simply be unfastened by removing the fastening means and replaced.
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Further, and advantageously, since the side braces 54 extend on both side
walls 34 of the flute 24, both side walls 34, as opposed to rolls for which
the
attachment 48 only covers a single side wall 34, are protected. Further, the
presence of the side brace 54 along each side wall 34, separating the head 76
of the bolt 74 and the nut 72 from the side wall 34, prevents direct contact
between the nut 72 and head 74 and the side wall 34, further reducing wear and
tear on the side wall 34, and thereby on the flute 24. Additionally, the
fastening
of the bolt 72 with the head 76 and the nut 72 securing the bolt 74 on
opposing
side braces 54 favors an even distribution of stress between the side walls 34
and side braces 54.
Referring again to Figure 1, two rolls 10 may be advantageously combined to
form a log feeding system, shown generally as 100, to feed the log L to or
from
a debarker or other equipment for cutting or treating the log L. As shown, the
system 100 consists of first and second rolls 10a, 10b. The flutes 24a of the
respective first set 18 for each roll 10 have attachments 48a with log
engagement sides 66a of top attachment sections 52 having gripping members
68. The flutes 24b of the respective second set 20 of each roll 10 have
attachments 48b with smooth and planar log engagement sides 66a on the top
attachment sections 52 thereof. The rolls 10 are positioned spaced apart,
preferably vertically, one other, preferably with their central positions 30
aligned
with one another and with sufficient space between the rolls 10a, 10b for
engagement of the log L by attachments 48 on the inner flute portions 38 of
the
rolls 10a, 10b. Their respective flutes 24 for the rolls 10a, 10b face one
another,
with the first set 18 of flutes 24 on the first and second rolls 10a, 10b
positioned
in axial alignment, relative the central position 30, with the second set 20
of
flutes on the rolls 10a, 10b. Accordingly, the first sets 18 of flutes 24 on
each
roll 10a, 10b are situated facing directly towards the second set 20 of flutes
on
the other roll 10a, 10b. Thus, there is an attachment 48a having gripping
members 68 on opposing sides of the log L when the log L passes between the
rolls 10a, 10b, assuring adequate traction for the log L. At the same time as
the
attachments 48b facing the attachments 48a having the gripping members do
not have gripping members 68 extending therefrom, the rolls 10a, 10b may be
placed closely together, thus permitting feeding of smaller logs L, without
having
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to align the rolls 10a, 10b or attachments 48 to avoid abutment between
gripping members 68 on the rolls 10a, 10b.
While a specific embodiment has been described, those skilled in the art will
recognize many alterations that could be made within the spirit of the
invention,
which is defined solely according to the following claims.
