U.S. patent number 3,908,499 [Application Number 05/384,492] was granted by the patent office on 1975-09-30 for knife retainer.
Invention is credited to William Dale Reed.
United States Patent |
3,908,499 |
Reed |
September 30, 1975 |
Knife retainer
Abstract
A knife retainer device for conveniently rigidly securing a
generally circular, thin cutting knife blade to an elongated arbor
while facilitating ready access to and removal of the knife for
knife maintenance and changing purposes. The retainer includes a
body portion adapted to be closely received over and affixed to an
elongated arbor and the body portion itself has a radially
outwardly extending flange defining a first blade engaging surface
with the end of the body portion adjacent the engaging surface
being threaded. The flange includes a plurality of peg-like members
extending outwardly from the first engaging surface axially of the
body portion toward the threaded end. The circular knife blade
comprises a segmented, two piece blade having a plurality of
mounting holes transversely therethrough which are adapted to
closely receive the peg-like members when the segments are properly
positioned on the retainer. Magnetic elements disposed in the first
engaging surface magnetically attract the knife segments for
temporarily holding them in position against the first engaging
surface in order that the final blade locking steps may be easily
completed. To finalize blade locking, a locking member having a
second blade engaging surface thereon is threadedly advanced along
the threaded area of the body portion from a first position
adjacent the outermost end of the threads to a second knife
engaging position with a portion of the side faces of the blade
being tightly engaged between the two blade engaging surfaces.
Inventors: |
Reed; William Dale (Mentor,
OH) |
Family
ID: |
23517515 |
Appl.
No.: |
05/384,492 |
Filed: |
August 1, 1973 |
Current U.S.
Class: |
83/665; 83/481;
83/698.51 |
Current CPC
Class: |
B23D
35/004 (20130101); Y10T 83/7747 (20150401); Y10T
83/9377 (20150401); Y10T 83/9469 (20150401) |
Current International
Class: |
B23D
35/00 (20060101); B23D 019/00 () |
Field of
Search: |
;83/481,698,699,665,666,676 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Meister; J. M.
Attorney, Agent or Firm: Fay & Sharpe
Claims
Having thus described my invention, I now claim:
1. A knife blade retainer device for conveniently mounting a rotary
cutting knife blade having a cutting surface disposed adjacent the
outermost edge thereof on an elongated arbor, said retainer
comprising:
an elongated body portion adapted to be generally axially received
over a portion of said arbor, said body portion including a first
knife engaging surface and means for selectively affixing said body
portion to said arbor;
means on said body portion for releasably receiving a knife locking
member;
knife blade locating means adapted to engage said knife and prevent
relative rotation between said knife and said retainer; and
a knife blade locking member including a second knife blade
engaging surface thereon, said locking member being selectively
receivable on said receiving means and movable thereon between a
first non-locking position with said second engaging surface
axially spaced from said first engaging surface and a second knife
locking position with said first and second engaging surfaces
closely spaced from each other with said knife blade clamped
therebetween, the knife blade locking member further including
means in said knife blade locking member for providing room for
said knife blade locating means to allow said second knife blade
engaging surface to engage said knife blade.
2. The retainer as defined in claim 1 further including magnetic
elements received in one of said first and second engaging surfaces
adapted to magnetically attract said knife blade to retain said
blade in position relative to said one engaging surface when said
knife locking member is in said first position.
3. The retainer as defined in claim 1 wherein said knife blade has
a central opening dimensioned to be received over said body portion
and is segmented into at least two substantially identical pieces,
each said piece including mounting holes spaced therearound
adjacent said central opening for receiving said knife locating
means, said knife locating means comprising a plurality of peg-like
members extending outwardly from said one engaging surface
generally axial of said body portion adapted to be received in said
mounting holes when said segments are properly positioned relative
to said retainer.
4. The retainer as defined in claim 3 wherein said releasable
receiving means comprises a threaded area adjacent said first
engaging surface and extending axially along a portion of said body
portion from one end thereof, said knife locking member being
threadedly received on said threaded portion and threadedly movable
between said first and second positions.
5. The retainer as defined in claim 4 wherein the means for
providing room for said knife blade includes a groove extending
circularly therearound, said groove receiving the outwardly
extending ends of said peg-like members as said locking member is
threadedly moved from said first toward said second position.
6. The retainer as defined in claim 5 wherein said peg-like members
are disposed in said first engaging surface.
7. The retainer as defined in claim 4 wherein said threaded portion
includes means disposed adjacent said one end for retaining said
locking member on said threaded portion.
8. The retainer as defined in claim 7 wherein said affixing means
comprises a threaded mechanical fastener extending generally
transversely through said body portion for selective clamping
engagement with said arbor.
9. The retainer as defined in claim 8 further including spaced
apart wrench receiving recesses in the outer peripheral surfaces of
said locking member and said body portion adapted for use in moving
said locking member between said first and second positions.
10. The retainer as defined in claim 1 wherein said body portion
comprises two substantially identical axial body portion halves and
further includes means for selectively rigidly interconnecting said
halves.
11. The retainer as defined in claim 1 wherein said locking member
comprises two interfitting locking member halves and further
includes means for selectively rigidly interconnecting said
halves.
12. A knife blade retainer device for mounting a cutting knife
blade on an elongated arbor, said retainer device comprising in
combination:
an elongated body portion having first and second ends and an
intermediate area, a bore extending axially through said body
portion between said first and second ends adapted to permit said
body portion to be closely received over said arbor, a first knife
blade engaging surface adjacent said second end disposed generally
transverse of said body portion, said second end including means
for receiving a locking member thereon;
means for rigidly affixing said body portion to said arbor to
prevent relative rotation therebetween;
a knife locking member having a second knife engaging surface
thereon, said locking member being received on said receiving means
and movable thereon between a first non-locking position with said
first and second engaging surfaces spaced apart from each other and
a second knife locking position with said engaging surfaces in a
closely spaced knife engaging relationship;
knife locating means disposed about one of said first and second
engaging surfaces extending outwardly thereof toward the other of
said engaging surfaces;
means on the other of said engaging means for providing room for
said knife locating means; and
a rotary knife blade having opposed side faces and a cutting edge
adjacent the outer peripheral surface thereof, said blade including
a central opening for permitting said blade to be received over
said body portion and means for blade mounting association with
said locating means, whereby when said engaging surfaces are in
said second position they engage portions of said opposed side
faces adjacent said central opening.
13. The retainer as defined in claim 12 wherein said receiving
means comprise a threaded area extending inwardly along said body
portion from said second end toward said first engaging surface and
including means disposed adjacent said second end for retaining
said locking member on said threaded portion.
14. The retainer as defined in claim 13 wherein said one of said
engaging surfaces includes magnetic members disposed therein for
attracting said knife blade and retaining it is position against
said first engaging surface when said locking member is in said
first position.
15. The retainer as defined in claim 13 wherein said one of said
engaging surfaces comprises said first engaging surface, said
locating means comprising a plurality of peg-like members spaced
around said first engaging surface and extending outwardly thereof
toward said second engaging surface generally axial of said body
portion, said blade mounting means comprising a plurality of spaced
holes extending transversely through said blade between said
opposed side faces with said plurality of holes being spaced and
dimensioned to receive said peg-like members and properly locate
said blade relative to said retainer adjacent said first engaging
surface.
16. The retainer as defined in claim 15 wherein said second
engaging surface includes a circular groove disposed therein for
receiving the outwardly extending ends of said peg-like members as
said locking member is moved from said first toward said second
position.
17. The retainer as defined in claim 16 wherein said knife blade is
comprised of a plurality of knife blade segments, said segments
each being individually locatable relative to said body portion to
cooperate in forming said blade.
18. The retainer as defined in claim 12 wherein said body portion
comprises two substantially identical axial body portion halves and
further includes means for selectively rigidly interconnecting said
halves.
19. A retainer as defined in claim 12 wherein said locking member
comprises two interfitting locking member halves and further
includes means for selectively rigidly interconnecting said halves.
Description
BACKGROUND OF THE INVENTION
This application pertains to the art of cutting apparatus and more
particularly to cutting apparatus which employ thin, rotary cutting
or slitting knives to effect desired cutting of workpiece
material.
The invention is particularly applicable to paper cutting or
slitting apparatus of the type substantially employed in the
newspaper printing industry and will be described with specific
reference thereto. It will be appreciated by those skilled in the
art, however, that the invention has broader applications and may
be employed in other cutting environments. For example, it may be
used to cut or slit cardboard, various metals and other materials
in situations where it is feasible to employ rotary cutting or
slitting knives.
In the newspaper industry, it is quite common to employ a plurality
of thin, circular slitting knives which are mounted on elongated
arbors which, in turn, are rotatably driven about their
longitudinal axes in order to effect desired slitting or cutting of
paper passed in contact therewith. Generally, a number of such
knives are mounted at spaced intervals along a single arbor with a
plurality of such arbors being variously located throughout the
paper processing machinery to effect the final desired results.
Such processing equipment is deemed well known in the art.
Due to the high speed at which such processing equipment is
operated, frequent failure and wearing of the blades occurs which
necessitates some type of maintenance. Normally this maintenance
takes the form of a "blade change", that is, replacement of the
failed or worn blade with a new one. In sophisticated and
interconnected processing equipment such as that used in the
newspaper industry, knife blade maintenance or breakdown periods
idle a considerable number of employees and machines. Because of
the financial losses involved during production idle time, it is
extremely desirable to design means whereby the knife blades may be
quickly mounted and unmounted on the arbors so that they can not
only properly perform their slitting or cutting function, but also
to permit them to be easily removed for maintenance and changes.
Such installations make it possible to reduce idle time and wasted
man hours with resulting increases in productivity. Although
several attempts have thus far been made to yield means for
accomplishing these desires, none of these means has yet achieved
the degree of flexibility required.
More specifically, circular knife blades have heretofore been
mounted to the arbors in a rigid manner by means of knife
retainers. An early improvement to the overall design technology
was to the effect of dividing the circular blades into a plurality,
normally two, of interfitting segments to permit the blade to be
assembled and disassembled over the arbor and eliminate the need
for slipping the blades off the ends of the arbors. The key to
solving the problem, however, lay in the retainer design and
typical of such arrangements are shown in U.S. Pat. Nos. 2,598,649
and 3,440,915. Although the earlier, improved retainers found some
success, they presented extreme difficulty to maintenance personnel
when the arbors were located on the processing equipment in fairly
inaccessible areas. That is, prior knife retainers of this type
have been designed in a manner which require workmen to
simultaneously employ both hands during knife changes and where
also a number of "loose" component parts were necessarily involved
during such knife blade changes. Thus, in the hard to reach limited
access and limited sight areas. maintenance personnel have
consistently had extreme difficulty in efficiently and timely
effecting knife changes when needed. For example, in some instances
using prior retainer designs, it takes approximately 20 minutes for
a single knife change which, although not seemingly great when
taken in and of itself, amounts to a great deal when considering
total man hours and production time lost as a result thereof.
The present invention contemplates a new and improved device which
overcomes the above noted problems and provides a new knife
retainer which is simple, economical, easy to use and readily
adaptable to a number of different slitting or cutting
environments.
BRIEF DESCRIPTION OF THE INVENTION
A new knife retainer is mounted on an elongated arbor for
conveniently rigidly holding a rotary knife blade having a cutting
surface along its outermost edge. The knife retainer comprises an
elongated retainer body portion which is adapted to be generally
axially received over a portion of the arbor at a desired spaced
position. This body portion includes means for selectively affixing
the body portion to the arbor and a first knife engaging surface.
The end of the body portion adjacent the first knife engaging
surface has means thereon for releasably receiving a knife locking
member. Knife locating means are disposed in the first knife
engaging surface which are adapted to engage the knife blade itself
for properly locating it on the body portion and for preventing
relative rotation between the blade and the retainer. A knife
locating member having a second knife engaging surface is
selectively movable on the receiving means between a first
non-locking position with the first and second knife engaging
surfaces spaced apart from each other and a second knife locking
position with the first and second knife engaging surfaces being
closely spaced to each other in a clamping relationship with a
portion of the side faces of the knife blade.
Magnetic elements are disposed in the first knife engaging surface
adapted to magnetically attract the blade for retaining it in a
desired position against the first knife engaging surface when the
locking member is in the first position.
The body portion may alternatively be comprised of two
substantially identical axial halves including means for
selectively rigidly affixing the two halves together to closely
surround the arbor.
The locking member may also be alternatively comprised of two
interfitting halves including means for selectively interconnecting
the locking member halves.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention may take physical form in certain parts and
arrangements of parts, a preferred embodiment of which will be
described in detail in the specification and illustrated in the
accompanying drawings which form a part hereof and wherein:
FIG. 1 is a perspective view of the subject new knife retainer when
mounted on a section of an elongated arbor;
FIG. 2 is a longitudinal cross-sectional view of the new knife
retainer taken along lines 2--2 of FIG. 1;
FIG. 3 is a cross-sectional view of the new knife retainer taken
along lines 3--3 of FIG. 2;
FIG. 4 is a cross-sectional view of the new knife retainer taken
along lines 4--4 of FIG. 2 in an optional two-piece
configuration;
FIG. 5 is a partial cross-sectional view taken along lines 5--5 of
FIG. 3; and,
FIG. 6 is a cross-sectional view similar to FIG. 3 showing an
alternative embodiment of a retainer incorporating the concepts of
the subject invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings wherein the showings are for purposes
of illustrating the preferred embodiment of the invention only and
not for purposes of limiting same, the FIGURES show a knife
retainer A affixed to a portion of a conventional elongated arbor
B. Retainer A is shown as rigidly retaining a thin, generally
circular knife blade C in a desired cutting position generally
transverse to the longitudinal axis of the arbor.
More specifically, and with particular reference to FIGS. 1 and 2,
knife retainer A is comprised of an elongated body portion
generally designated 10 having a first end and end face 12 and a
second, spaced apart end and end face 14 with an intermediate area
16 disposed between ends 12, 14. Included along intermediate
portion 16 toward second end 14 is a radial outwardly extending
flange generally designated 18. A bore 20 extends axially through
the body portion between the end faces of ends 12, 14 and is
dimensioned to be closely slidably received on arbor B. Of course,
the size of bore 20 may vary depending upon the specific processing
apparatus arbor size requirements. Inasmuch as these dimensional
characteristics are deemed conventional, further elaboration
thereon is not considered necessary.
Intermediate area 16 has an outer peripheral surface 30 extending
between first end 12 and flange 18 and includes a threaded hole 32
extending generally transversely therethrough into bore 20. A
conventional threaded member 34 is threadably received in hole 32
for selective threaded movement into and out of clamping engagement
with arbor B to affix the knife retainer in a desired position
longitudinally along the arbor. Although the threaded member
comprises a set screw in the preferred embodiment, it will be
appreciated that other, convenient means may be employed for
affixing the retainer to the arbor without departing from the
intent and scope of the present invention.
Outwardly extending flange 18 includes an outer peripheral surface
36 and a pair of opposed side faces 38, 40. At least side face 40
extends in a plane transverse to the axis of arbor B and defines a
first knife engaging surface, the use of which will be described
and become fully apparent hereinafter. A plurality of wrench
receiving recesses 42 are disposed about peripheral surface 36 and
adapted to receive a spanner type wrench for assembling and
disassembling the retainer. Extending through flange 18 from side
face 38 and outwardly of side face 40 are a plurality of pins or
peg-like members 44 which comprise blade locating means to assist
in properly locating the blade. Preferably, peg-like members 44
comprise hardened dowel pins and are located in flange 18 by a
force fit arrangement in holes 46. The outermost ends of members 44
protrude outwardly from side face 40 a short distance in a
direction generally axially of the body portion itself. Although
four such peg-like members equally spaced around the flange are
preferred, it will be appreciated that other numbers of the members
could be employed if so desired. Disposed adjacent side face 40
along intermediate area 16 toward and including second end 14 is a
threaded area 48. This threaded area is adapted for receiving a
knife locking member to be described in detail hereinafter. It will
be appreciated that area 48 could have other configurations for
receiving a knife locking member such as, for example, a bayonet
type connection, etc. without departing from the scope and intent
of the present invention.
The knife locking member employed in the preferred embodiment is
generally designated 60. Basically, the member is annular shaped
having an outer peripheral surface 62 and opposed spaced apart side
faces 64, 66. In the preferred arrangement, at least side face 66
is disposed so that when the knife locking member is associated
with the body portion on threaded area 48, the plane defined by
that side face is generally transverse to the axis of the arbor and
parallel to side face 40. Side face 66 defines a second knife
engaging surface for selective blade clamping cooperation with the
first knife engaging surface. The inner peripheral surface of
annular locking member 60 includes a threaded area 68 extending
axially therethrough which threadedly engages with threaded area 48
of body portion 10. A plurality of wrench recess areas 70 are also
disposed around outer peripheral surface 62 to receive spanner type
wrenches for convenient assembly and disassembly of the locking
member. Side face 64 includes a circular peg receiving groove 72
(FIGS. 2 and 4) which receives the outwardly extending portions of
peg-like member 44 as second blade engaging surface 66 on the
locking member is brought into close spaced association with first
blade flange 18 by threadedly advancing locking member 60 on
threaded portion 48. A stop or ring member 80 closely received over
second end 14 adjacent the end face establishes a positive first
position for the locking member to provide means for maintaining
the locking member in a threaded relationship with the body
portion.
As best shown in FIGS. 3 and 5, a plurality of magnetic elements 82
are also disposed in first blade engaging surface 40. In the
preferred embodiment of the present invention, there are shown two
such magnetic elements oppositely disposed from each other although
it will be appreciated that other numbers could be variously
employed without departing from the intent and scope of the present
invention. Also, these magnetic elements preferably comprise
generally cylindrical ceramic magnets which are press fit into
corresponding receiving holes (not shown) so that the outermost
surfaces thereof are flush with the surface of first blade engaging
surface 40 itself (FIG. 5). These magnetic elements are employed to
temporarily maintain knife blade C in position during blade changes
as will hereinafter be more fully described.
As used in the environment here under discussion, knife blade C is
a thin, generally circular blade comprised of a pair of
interfitting arcuate or semi-circular blade segments generally
designated 90, 92 which mate with each other in an abutting
relationship so as to form a joint 93. The broad concept of such
blade designs per se are deemed to be known and include spaced
apart side faces 94, 96, continuous outer peripheral surface 98 and
a cutting edge 100. However, when employed with the subject new
retainer, side faces 92, 94 of each segment have a plurality of
locating and mounting holes 102 therein which are spaced apart and
dimensioned to correspond to the dimensioning and spacing of
peg-like members 44. This structure facilitates proper mounting and
locating of segments 90, 92 by mounting cooperation between
peg-lime members 44 and locating and mounting holes 102. Again, the
blades themselves are deemed to be substantially conventionally
known except for the locating and mounting hole arrangements so
that further elaboration thereon is not deemed necessary. It should
be noted, however, that the diameter of the assembled blade is
greater than the cross-sectional dimension of the two blade
engaging surfaces so as not to interfere with the actual cutting or
slitting operation.
In using the above described knife retainer, and assuming that the
retainer has already been desirably located and rigidly affixed to
the arbor, description will hereinafter be made with reference to
removing and installing a knife blade C in retainer A. In this
regard, a spanner type wrench is used in association with recesses
70 on locking member 60 and recesses 42 in flange 18 to back the
locking member off from its closely engaging, locking position with
the knife blade positioned as shown in the solid lines of FIG. 2 to
a first position as generally shown in the phantom lines of FIG. 2.
The first position is normally a positive position established by
stop or ring member 80. In this position, segments 90, 92 may be
freely withdrawn from their association with the retainer,
particularly, as between locating and mounting holes 102 and
outwardly extending peg-like members 44. This position of the
segments is also shown in phantom in FIG. 2.
Next, two new segments 90, 92 are located on the retainer by means
of the cooperating peg-like members and locating and mounting holes
to mate at joint 93 and form the generally circular knife blade C.
Since the arbors are often disposed in areas which are not readily
accessible and since the knife blades are normally constructed from
steel, magnetic elements 82 disposed in first knife engaging
surface 40 magnetically attract the segments to magnetically retain
them in position against surface 40 until the locking member can
again be threadedly moved into the second blade engaging position
with the segments. Thus, following proper location of the new
segments, it is then merely necessary to advance locking member 60
from its first position to the second knife engaging position until
blade segments 90, 92 are closely, tightly embraced between first
and second knife engaging surfaces 40, 66. As will be particularly
seen from FIG. 2, groove 72 facilitates this operation by receiving
peg-like members 44 therein so as to eliminate any interference
problems between the retainer components. Once tightening is
completed by means of, for example, spanner type wrenches, the new
blade is ready for production use.
The above described new knife retainer device facilitates ease of
blade removal and installation for blade maintenance or change
purposes. In using the subject new retainer, the changing work may
be substantially effected by maintenance personnel using only one
hand without the necessity for removing any of the retainer
components from association therewith. This provides a substantial
advantage when an arbor is located in an area which is not readily
accessible so that replacement of, for example, screws, retainer
rings, etc. would be extremely difficult and time consuming where
maintenance personnel could not have full view and access to the
entire retainer assembly. It has been found that with prior knife
retainers, a single knife changing time of approximately 20 minutes
is not at all uncommon and that when using the concepts of the
subject invention for the same knife change, only a 5 minute
changing time is required. This time reduction represents a
significant savings as to undesired processing equipment downtime
and production personnel idle time. These savings are particularly
significant when considering the number of individual blade
installations and the frequency of blade changes for a single piece
of typical processing equipment.
Although body portion 10, including flange 18, and locking member
60 have been shown as preferably being generally cylindrical in
configuration, it will be appreciated that other configurations
could be employed without departing from the intent and scope of
the present invention. The embodiment shown is deemed to more
equally distribute operating stresses throughout the entire
retainer device than would other possible configurations. Also, the
retainer components are desirably constructed from steel.
Referring now to FIG. 6 of the drawings, there is shown an
alternative arrangement for body portion 10 in which body portion
is of a two piece construction with the pieces selectively fastened
together so as to embrace arbor B. Accordingly, for ease of
illustration of the arrangement, new components are designated by
new numerals and like components include like, primed (') numerals.
The view of FIG. 6 is substantially identical to the view of FIG. 3
and shows the body portion as being comprised of two body portion
halves 110, 112. Basically, the entire body portion has been
axially cut in half with the halves then being selectively held
together to surround the arbor by means of mechanical fasteners.
Accordingly, FIG. 6 shows halves 110, 112 closely received over
arbor B' and closely affixed to each other by means of standard
threaded mechanical fasteners 114, 116 with each fastener being
received in a standard countersunk hole 120 for threaded engagement
with an aligned threaded hole 122. Holes 120, 122 are preferably
disposed in flange 18' to pass substantially coplanar therethrough.
Once this retainer embodiment has been installed over and located
on an arbor use of the retainer itself is the same as that
hereinabove described with reference to FIGS. 1-5. It is also
possible to similarly fabricate annular locking member 60 from two
pieces as shown in FIG. 4 and interconnect the pieces by standard
mechanical fastening means of the type shown in FIG. 6.
The invention has been described with reference to the preferred
embodiment. Obviously, modifications and alterations will occur to
others upon the reading and understanding of this specification. It
is my intention to include all such modifications and alterations
insofar as they come within the scope of the appended claims or the
equivalents thereof.
* * * * *