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Патент USA US3031917

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May 1, 1962
3,031,907
M. E. STEWART
SHEET PERFORATING DEVICES
5 Sheets-Sheet 1
Filed March 8, 1956
M4�4AL 5. 575144427,?
IN VEN TOR.
BY
WW
May 1, 1962
M. E. STEWART
3,031,907
SHEET PERFORATING DEVICES
Filed March 8, 1956
5 Sheets-Sheet 2
67
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MRS/�; 5 572714427;
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IN VEN TOR.
Isl/W
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May 1, 1962
M. E. STEWART
3,031,907
SHEET PERFORATING DEVICES
Filed March 8, 1956
5 Sheets-Sheet 3
M?esy/ux. 5. 572M427;
IN VEN TOR.
4%
5/1-"?"1 50
BY
W
May 1, 1962
M. E. STEWART
3,031,907
SHEET PERFORATING DEVICES
Filed March 8, 1956
5 Sheets-Sheet 4
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INVENTOR.
BY
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I
Wag/L
May 1, 1962
3,031,907
M. E. STEWART
SHEET PERFORATING DEVICES
Filed March 8, 1956
5 Sheets-Sheet 5
42
554'- 5
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41/4257/414 �." 5751/1/42];
INVENTOR.
BY
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rates
Faterrted May 1, 1962
?it
is opaque for front picture projection. The'latter type
is the one most generally adapted for theater screens
and in this type of screen it has been found necessary,
for realisnnto perforate the screen to adapt the-screen
3,031,937
SHEET PERFURATENG DEVEQES
Marshall E. Stewart, 1011 Ave. A, Redondo Beach, Calif.
Filed Mar. s, 195e, 5261?. No. s'iasss
13 Ciaitns. {@i. 253M146)
This invention relates to perforating devices and more
particularly to perforating devices adapted to pattern
perforate sheet and strip materials and still more par
ticuiarly to perforating devices adapted to pattern perforate
for the rear projection of sound waves therethrough. As
the size of such perforated?theater screens increased,
however, the perforated areas of the screen became more
apparent to the viewer and it has been found necessary
to perforate the screen over substantially its entire view
10 ing area in a substantially unobservable pattern con;
sisting of uniformly close spaced small diameter vperfora
tions providing the minimum loss in re?ected radiation
sheet and strip material utilizable as picture projection
screens to adapt same for theprojection of sound waves
from the viewing face of the screen and?the minimum in;
terference with sound waves passing through the screen.
One piece of seamless theater screens of substantially
any desired large size may now be produced by spray.
therethrough.
The object of the invention is to provide an improved
pattern perforating device for sheet and strip materials.
Another object is to provide an improved pattern per
methods utilizing synthetic'resins, plastic and rubberoid?
forating punch for perforating devices.
compounds in combination with filler and coloring com
pounds. The particular spray method or spray compo
sition employed in the forming of these one piece seam
Still another object is to provide a pattern perforat?
ing device for sheet and strip material which is adapted
to perforate the sheet or strip material in a plurality of
less screens forms no part of the present invention anda
disclosure of same is unnecessary for one skilled in the
art to understand the present invention. In general the
end and side aligned punching operations with each
punch operation producing a parallel sided perforated pat
tern having spaced peripheral punch holes aligning with
the spaced peripheral punch holes of an adjacent end and
seamless screen produced by spray methodsv is ?'e'iiible
vice speci?cally adapted to pattern perforate sheet and
strip material suitable for utility as picture projection
vary widely in height and width but may be as high as 40?
Another object is to provide an improved pattern
inch.
The device of the speci?c embodiment has been adapt
ed to perforate this type of seamless picture projection
side aligned pattern to form an unbroken continuation 25 enough to ?be rolled upon a large-diameter roller and
strong enough to be sustained taut about it's periphery
of the pattern on the strip of sheet material.
in a vertical plane without distortion. Theater-screens
A further object is to provide a sheet perforating de
feet and as Wide as 70 feet?.
The thickness of the one
screens thereby to adapt the screen for the projection of 30 piece screens also? may? vary widely but in general the
larger sized screens have a thickness approximating .015
sound waves therethrough.
perforated picture projection screen.
Other objects will be apparent as the invention is more
fully hereinafter disclosed.
35 screen material in a uniform pattern having perforations?
of .042 inch diameter disposed in a diagonal diamond?
In accordance with these objects I have devised an im
shaped pattern having 36 equ'i-spaced perforations? per
proved pattern perforating device for pattern perforating
square inch with the pattern extending over substantially
the entire viewing area of the screen. This pattern of
sheet and strip material, one speci?c embodiment of
which is illustrated in the accompanying drawings, in
which device the sheet or strip material is pattern per 4:0 perforations has been found to provide with picture
forated over all or any desired area thereof, in a suc- I
cession of end and side aligned punching operations with
each punch operation producing identical substantially A
parallel sided perforated pattern of a determined size
having spaced peripheral perforations therein adapted to
projection screen material comprised of the plastic rriix�
tures above identi?ed the minimum loss in re?ected radia
tion from the viewing surface thereof with the minimum
interference with the projection of sound waves through
With other types of picture projection screen
material and other compositions comprising the same the
perforated pattern employed ?may vary either as to the
45 the screen.
align with the spaced peripheral perforations of an ad
jacent end or side aligned pattern to form a continuation
diameter of the perforations or as to the number of
of the pattern in the strip or sheet material.
perforations per square inch or as to the pattern arrange
In the device of the present invention the sheet or strip
material is sustained for intermittent movement in a 50 ment of the perforations employed therein without de
horizontal plane through a perforating zone extending
across the sheet or strip transverse to the direction of
sheet or strip movement and a punch means is pro
vided to perforate each transverse section of the sheet
or strip material moved into position in the perforating 55
zone or any desired part thereof in a succession of equi
sized end aligned parallel sided patterns of perforations
parture ?from the? invention;
Before further disclosure of the speci?c embodiment
of the present invention reference should be made? tothe
accompanying drawings wherein;
FIG. 1 is a side elevational view of the sheetlpe?rforat
ing device of the present invention;
FIG. 2 is avertical section of one end of the device
taken along the vertical plane 2?2 of FIG. 3;
the peripheral perforations of which are so arranged
FIG. 3 is a cross sectional view taken along plane 3?3.
as to align with the peripheral perforations of an ad 60
of FIG. 2;
jacent end or side aligned pattern of perforations to form
FIG. 3a is a cross sectional view taken along plane"
therewith a continuation of the pattern.
3a of FIG. 1;
.
The perforating device of the speci?c embodiment has
FIG. 4 is a sectional view taken along plane 4-4.
been devised particularly for the pattern perforating of
sheet and strip material utilized in the forming of picture 65
of FIG. 1;
projection screens to adapt the screen for the projection
of sound waves therethrough. It is to be understood,
FIG. 1;
however, that the invention is not limited in its scope or
utility to picture projection screen material.
.
PEG. 5 is a sectional view taken along plane 5-?5 of?
.
FIG. 6 is a side elevational view taken along plane"
6?~6 of FIG. 4;
FIG. 7 is a sectional view taken along plane 74-7 of
Heretofore in the art of picture projection screens two 70 FIG. 6;
FIG. 8 is a sectional View taken. along plane 85-88 of"
main types of screens have been produced. ?One type is
FIG. 7;
translucent for rear picture projection and the other type
I
4
FIG. 9 is an enlarged broken away cross sectional view
S. Experiments have further determined that a pattern
taken along plane 9-9 of FIG. 7;
of equi-spaced holes of this diameter having approximately
FIG. 10 is a plan view illustrating the perforating pattern
of the perforating punching head of the device of the
36 holes per square inch arranged in a diagonal diamond
shaped pattern was substantially undetectable by the
viewer at the usual minimum viewing distance provided
in most theaters. Experiments have further determined
that this size perforation arranged ?in this type of pattern
provided little, if any, interference to the projection of
present invention;
FIG. 11 is a sectional view taken along plane 11-11
of FIG. 4;
FIG. 12 is a sectional view taken along plane 12?12
of FIG. 4; and
sound waves through a screen comprised of this type of
FIG. 13 is a schematic view illustrating the compressed 10 plastic material.
air actuating means adapted to operate the perforating
The punching head H Was designed to provide for the
head of the present invention.
pattern punching of all or of a selected portion of a one
Referring to the drawings it is believed apparent that
piece seamless screen of this thickness and composition
the device of the present invention is provided with a
in a uniform pattern having equi-spaced .042 inch diameter
punching head denoted generally by the letter H mounted _ holes in a diagonal diamond shaped pattern having 36
on a carriage, denoted generally by letter C, rollably sus
holes per square inch. In the design of this punching
tained by wheels w??w and w'??w? on parallel tracks
head the means A adapted for actuating the punch P is a
T-?T' with a punch P sustained on the punching head H
reversible compressed air cylinder 10, arranged to actuate
to be actuated vertically by an actuating means, generally
pivoted lever arm 11 to move the punch rod 12 down
denoted by the leter A, towards and away from anvil
wardly a determined punch stroke in one direction of
plate, generally denoted by the letter K, sustained horizon
tally on the punching head H below the punch P with the
space gap between the punch P and the anvil plate K de
cylinder 10 actuation and reversely upward to ?rst posi
tion onthe reverse actuation of the cylinder It}. Any
other equivalent means for actuating the punch P may
be substituted for the means shown without departure
?ning a horizontally disposed punching plane extending
over the entire distance of travel of the head H and car
riage C along the tracks T?~T'.
In combination with the head H, and its associated in
strumentalities, the device is provided with a means to
feed the sheet S through the horizontally disposed punch
25
mm the invention.
In the speci?c embodhnent shown the cylinder 16 is
actuated by compressed air at 125 pounds pressure from
tank i3 (PEG. l3). Compressed air from the tank 13
passes through the dust and oil ?lter traps 14-15 into
ing zone de?ned by space gap between the punch P and the 30 lines id~17 to actuating valve V1 and reversing valve V2,
anvil K in such manner as will provide for the successive
respectively. When button 18 of the valve V1 is pushed
perforation of any part or all of contiguous transverse , inwardly manually the compressed air at 100 pounds pres?
areas? of the sheet by the punch P in a succession of end
sure in the line i6 passes into line 19? and to?one end of
andside aligned punching operations. The means to feed ' the cylinder it} to actuate the lever 11 and the punch rod
the sheet S through the horizontally disposed punching
12 in the direction indicated by the arrows. As the punch
zone comprises the reels R1 and R2 horizontally sustained
rod 332 is thereby moved downwardly the adjustable stop
in parallel spaced relation on opposilte sides of the punch
P by the trestle support means F- ' to be rotatable about
their respective horizontal axis by an end support means
means
moves therewith to a position actuating button
21 of the reversing valve V2. Actuation of valve V2
passes the compressed air in line 17 into line 22 and into
general-1y denoted by the letters E-E'.
40 valve V1 in such manner as to shift the valve V1 back into
Also in combination with the above identi?ed instru
?rst position with the air pressure passing into line 23 and
mentalities the device of the present invention includes
into the opposite end of the cylinder It} to reverse the
a brake means B-?B?, one on the end of each of the reels
R1 and R2, to control the rotation of the reels R1 and R2,
a means D to control the movement of the carriage C along
the tracks T?T' and guide bars G1 and G2 to align each
transverse section of the sheet S horizontally in punching
position under the punch P in the space gap between punch
P and anvil plate K.
-
As may be noted in FIG. 1 the length of the reels
R1-??R2 is many times the Width of the punching head H.
In the speci?c embodiment shown punch P of the punch~
cylinder 1% and to return lever arm 11 and the punch rod
12 to ?rst position and to hold rod 12 in this position
until button 13 is again actuated manually.
The punch P attached to the bottom end of the punch
rods 1?2'?l2? is limited as to size by the punching power
provided by the cylinder 1d and lever arm 11. In this
instance with each punching pin requiring about 8 pounds
punching pressure to perforate a hole in the speci?c screen
material described and with each square inch of pattern
perforated area containing 36 holes a pressure of 288
ing head H has an actual punching area of 6" x 6" and
pounds is required for each square inch of perforated
the length of the reels R1?R2 is about 35 feet. The
area. The punch P is provided with a total number of
length of the reels R1 and R2, however, may be varied 55 1380 punch pins equi-spaced over a six inch square area
widely without departure from the invention as it merely
which would require a punching pressure of 11,040 pounds
limits the maximum Width sheet or strip material utilizable
which is beyond the power possibilities of the cylinder it)
by the device.
and lever arm 11 at the air pressure employed. How
The sizcof the punch P also may be widely varied
ever, I have discovered that by providing a plurality of
without departure from the invention depending upon
di erent length punch pins with each length being equi
the material to be punched, the punching power available
spaced on the punch P the punching pressure required
and the number of punching pins carried by the punch P
may he reduced by the number of different pin lengths
of the punching head H.
employed.
The pattern punching device of the speci?c embodi
In the speci?c example shown I employ four (4) dif
ment shown in the drawings was designed for the pattern 65 ferent lengths of punch pins, each length being equi
perforating of relatively large sized one piece seamless
spaced over the 6" x 6? square area of the punch I?,
picture projection screens used in theaters, the screen be?
thereby reducing the punching pressure required from
ing comprised of an opaque plastic composition of the
11,640 pounds to 2,760 pounds which is well within the
type above identi?ed having a thicknessof about .015
power limits of cylinder it) and lever arm 11. By this
inch. In this type of sheet material experiments have 70 arrangement of punch pins the 6 square inch area covered
determined that the punching pressure required to punch
by'the punch P is perforated in one punch stroke in four
a hole of about .042 inch diameter in the material approxi
mated 8 pounds.
This punching pressure will vary with variation in the
(4) successive punching operations.
One of the features of punch P is that the pins 55 are so
arranged in the punch P that the peripheral pins along
plastic composition employed in the forming of the sheet 75 each side of the punch P form spaced perforations that
?3,031,907
5
6
an unbroken
end and side
will be noted
mounted on post 51 forming an extension of the carriage
C and a part of the yoke or head H. The space gap be
align with the spaced perforations formed by the pins on
the opposite side of the punch P to form
continuation of the pattern in contiguous
aligned punch areas.
Referring now to FIGS. 1, 4, 5 and 6 it
that the punching head H mounted on the
.
a punch pin guide stripper plate 44 and means such as
depending side plates 45-45" to sustain the guide, stripper
plate 44? in parallel spaced relation to the plates 40 and 42
and in parallel spaced relation to the anvil plate 50 (K)
carriage C is
comprised essentially of a yoke (denoted by the letter H)
vertically sustained on the carriage C, having the punch P
mounted on the upper jaw and the anvil plate K mounted
tween the anvil plate 50 and the guide stripper plate 44
forms the perforating plane and pathway traversed by
the sheet S between reels R1 and R2.
As may be noted in FIGS. 7 and 8 particularly the
on the lower jaw with the means A mounted on the top 1O
punch pin anchoring plate 42 is provided with a plurality
of the yoke or head H. The unwinding reel R1 is sus
tained horizontally through the throat of the yoke or
read H and the Winding reel R2 is sustained in parallel
spaced relation to the reel R1 :but at a lower horizontal
level adjacent to the opposite side of the punch P with a
tensioning guide bar G1 disposed in parallel spaced rela
tion thereto having an upper surface, over which the sheet
S? passes, lying in? the same plane as the punching plane
provided ?by the space gap between punch P and anvil
plate K.
it is believed clear from FIG. 4, for example, that each
six (6) inch transverse section of the sheet S may be
sequentially moved into punching position under the
punch P by appropriate rotation of reels R1 and R2 and
of equi-spaced holes forming the desired perforating pat
tern. in this speci?c embodiment the punch pin holes
each have a diameter closely approximating .042 inch
diameter and are equi-spaced in a diagonal diamond
shaped pattern providing 36 holes per square inch and a
total number of 1380 holes in the 6 inch by 6 inch square
area of the anchoring plate 42.
The punch pins 55 are comprised of any suitable me
tallic composition such as, for example, piano wire. In
the forming of the punch pins 55 from piano wire the
wire is square cut into the desired length and one end of
the wire length is bent over at a right angle to form a head
56 thereon. As indicated in H6. 9, in this speci?c em
that the entire length of each six (6) inch transverse sec 25 bodiment the punch pins 55 are provided with four (4)
different lengths (55a, 55b, 55c and 554!) with each length
tion of the sheet S may be pattern perforated by the
punch pin distributed uniformly in equi-spaced relation
punch? P as it is moved, forwardly or reversely, along the
in the openings provided in the anchoring plate 42. The
tracks T??T? in successive end aligned six (6?) inch move
object of this plurality of lengths of the punch pins 55 is
ments between each punch actuation in an edge aligned
to limit the perforating power required at any one time to
pattern and that the successively punched end aligned
one-fourth of the total required during each stroke of the
patterns in each transverse section may be similarly side
punch P. The provision of a? plurality of different length
aligned to form a continuation of the pattern along the
punch pins 55, each uniformly dispersed over the punch
entire length of the sheet screen material.
ing area of the punch P also materially lessens the punch
The means D provided to limit the forward or reverse
ing shock on the sheet S and materially reduces pattern
movement of the punch P to a distance bringing the rear
distortion. In picture projection screens pattern per
edge of the punch Pinto alignment with the forward edge
forated for the projection of sound waves therethrough
of?the previously punched area of the sheet S thereby to
any non-uniformity in the perforating pattern is readily
edge align each successively punched pattern area con
discernabie by a viewer.
sists of the means shown more particularly in FIGS. 4,
Referring now to H6. 10, the perforated pattern pro
ll and 12; This means D comprises essentially a. shaft
vided by the punch P in the sheet S is illustrated in this
39 vertically sustained by bracket 31 on the carriage C to
?gure. It is to be noted that the perforations about the
be rotatable about its axis. A gear 32 is mounted on the
periphery of the pattern are so arranged that the spaced
bottom end of the shaft 30 to engage rack 33 horizontally
perforations along the pattern edge a will align with the
mounted in parallel spaced relation to the track T1.
With this arrangement any movement of the carriage C 45 spaced perforations along the pattern edge b and the
spaced. perforations along the. pattern edge c will align
along the tracks T-T? will rotate shaft 30" about its axis
in- one direction or the other. On the other end of the
shaft 30 is mounted disc 34 to rotate therewith. In the
with the spaced perforations along the pattern edge d to
form a continuous and unbroken pattern in the sheet S,
as successive end and side aligned punched areas are
upper face of this disc 34 (see FIG. 11) is provided an
annular traclrway 35 limited as to its length by spaced 50 formed in the sheet S in successive transverse areas.
The forming of successive and aligned pattern punches
holes 36-?36? to the precise distance of forward and
in the sheet S in each transverse section is obtained by
reverse movement desired in carriage C to bring the rear
means of the, control means D. The forming of side
face of the punch P into alignment with the forward edge
of the previously punched pattern of sheet S.
A spring urged stop pin 37 is vertically sustained to be
axially moveable against the urging of the spring means
aligned pattern punches in the next transverse sectionof
the sheet Sis obtained by rotating the reels R1 and R2
sufficiently to locate the next adjacent six inch transverse
section of the sheet S in punching position under the
38 by the toggle means 95, 96, 97 and 98 manually oper
punch P and locking the section in position by means of
able by the handle lever 99, with the free end of the pin
thebrake means B-?B' under suflicient tension to hold the
37 riding in the trackway 35. With this arrangement the
forward and reverse emovement of the carriage C along 60 same tautl'y in the horizontal plane de?ned by the guide.
the tracks T--T? is limited to the length of the trackway
bar G1 and reel R1.
Referring now to FIGS. 2 and 3, the details of the end
35 lying betweenthe holes 36 provided therein to receive
the pin 37. The carriage C may be moved freely along
support means E?-E? for the reels R1 and R2 may be
the entire length of the tracks T'??T' by manually restrain
noted. The reels R1 and R2 are each comprised of light
ing the pin 37 from being spring urged into stop position 65 Weight tubular material such as seamless aluminum tub
in the holes 36. Any alternative means for obtaining
ing and the means E-E? is provided in each end of each
the same result may be used without departure from the
reel R1 and R2 to rotatively sustain the tubular reels R1
invention.
and R2 in a non-sagging horizontal position on the trestle
Referring now more particularly to H68. 6, 7, 8, 9 and
supports
F?-F?.
10, the details of construction of the punch P may be rec 70
The non-sagging horizontal support means for the tubu
ognized. The punch P is comprisedof a base plate 40
lar reels R1 and R2 must be variable to permit adjustment
adapted to be secured for vertical up and down movement
of the means as the Weight of the sheet S on the unwind
on the end of punch rods 12-12? by a means such as set
ing reel R1 decreases and as the weight of the sheet S on
screws 411-?41?, a punch pin anchoring plate 42' and means,
such as bolts 43, to secure the same to the base plate 40, 75 the winding reel R2 increases.
3,031, so?
7
To obtain these desired results i have provided for each
end of the reels R1 and R2 the variable non-sagging sup?
port means illustrated with particularity in FIGS. 2 and 3.
In this means I provide a rotatably fulcrumed lever arm
insert consisting of a tube shaft 7!} having spacer plates
71 and 72 secured thereon having an outside diameter
?tting closely the inside diameter of the tubular reel R1
(or R2) thereby to locate the tube "It? centrally within the
reel R1. Spacer plate 71 is secured to the reel R1 by
means of a plurality of counter sunk bolts 73 to be axially
rotatable with the reel R1. A plurality of triangular rein~
forcing webs 74 are concentrically mounted in spaced
radial relationship on the outer surface of the tube '70 and
are end secured to the inner surface of spacer plate 71.
3
position of axial rotation during the pattern punching of
each transverse section of the sheet S with the length
of the sheet S extending therebetween maintained under
tension between the reels R1 and R2 in a plane coinciding
with the punching plane. Any alternative brake means
providing this desired result may ?be employ without de
parture from the invention.
It is believed apparent from the above disclosure of
the present invention that the pattern perforating device
of the present invention is adapted for the pattern perfo
rating of sheet material of substantially any perforable
composition and thickness, metallic and non-metallic,
and that the geometric pattern arrangement provided in
the speci?c embodiment ?for perforating picture projection
The overall length of the insert lever arm may vary widely 15 screens may be widely varied without essential departure
but I have found that the most effective length is that
from the invention. It is also believed apparent that
locating spacer plate 72? at a point approximating one
the various operating elements of the device of the spe
fourth of the length of the reel R1.
ci?c embodiment each may be widely varied without
The extending end of tube 79 is rotatably fulcrumed
essential departure from the invention and all modi?ca
by means of an annular bearing 80 side secured to the 20 tions in, changes of and departures from the pattern per
outer surface of spacer plate 71 to be rotated therewith
forating device of the present invention as herein dis
and the extending length of tube-7t} is reinforced by radi
closed generically and speci?cally and as illustrated in the
ally extending triangular ?ns 81 weld-secured to the tube
drawings in one speci?c embodiment are contemplated as
76 and to the bearing St}. Roller supports 8'2??83 are
may fall within the scope of the following claims.
sustained on the cross bar 84 by an adjustable support 85 25
What I claim ?is:
so that each end of the reel R1 may be sustained with the
1. A perforating device for perforable sheet and strip
rotating axis of the reel in a horizontal plane adjacent the
materials, said device comprising in combination a punch
horizontal plane of the punching zone provided between
and an anvil and unitary support means vertically sus
punch P and anvil plate K.
tained on a carriage sustaining the punch and anvil in
The means to actuate the lever arm insert on its rotat
vertical close spaced alignment with a horizontal per
able fulcrum provided by the annular bearing 86' and
forating zone de?ned therebetween with said anvil mount
rollers 82-83 to straighten the reel R1 and to overcome
ed on the lower portion of the support means and the
sag therein consists of a means to apply a variable down
punch mounted on the upper portion of the support
ward pressure on the extending end of the tube 7 t} thereby
means, guide means for mounting said carriage thereon
to cause the tube '76 to pivot on its fulcrum and to cause
to engage it to sustain the carriage, said carriage being
spacer plate 72 to press upwardly against the inner surface
freely movable relative to said guide means to actuate
of the reel R1 sufficiently to remove the sag from the
the vertically aligned punch and anvil simultaneously
reei R1.
forwardly and reversely in ?a straight line horizontal path
The particular means to apply this pressure shown con
of determined length, a rack mounted in parallel spaced
sists of a rod or stub shaft 86 rotatably mounted in spaced 40 relation to the guide means, a gear sustained on said car
bearings 37-?38 and a turn buckle means 89 having one
riage in a position to engage said rack and to be rotated
end anchored to the ?oor and the other end secured to the
thereby, a shaft connected to said gear to be rotated there?
rod or stub shaft 86 to apply the desired or required
by, a cam connected to be rotated by said shaft and a
variably downward pressure onto the rod or shaft 86.
releasable spring urged pin stop means limiting the rota
Any other alternative means to apply the required vari
directly to the lever arm tube shaft 70 may be used with
tion of said cam to that representing the precise distance
of travel of said carriage along said guide means re
quired for end to end alignment of said punch to limit
out departure from the invention.
It is believed apparent that the turn buckle tensioning
path to a distance providing successive end to end move
able downward pressure to the rod or stub shaft 86 or
means shown is widely variable as to the amount of pres~ ~
the distance of travel of the punch and anvil along said
sure exerted as to meet substantially any condition of sag
ments'of the punch and anvil along said path, means to
feed successive transverse sections of a length of the sheet
present in the reel R1 and that by the provision of such a
rotatably fulcrumed lever arm insert and variable tension
ing means therefor in each end of the reels R1 and R2 the
said reels?may be sustained under variable load conditions
in a non-sagging horizontal position as is desired by this
by the space gap between said punch and anvil in a di
rection at right angles to the said path, said means in
cluding means sustaining each transverse section in sub
support means.
The brake means B provided at one end of each reel
R1 and R2 to hold the reels R1 and R2 in any desired posi
tion of axial rotation with the length of sheet S lying
therebetween in sufficient tension to maintain the length
in horizontal coincidence with the punching plane be
tween the guide bar G1 and R1 may be widely varied
without departure from the invention.
and strip material through the perforating zone de?ned
stantial horizontal coincidence with the said perforating
zone, and means to actuate said punch into perforating
engagement with the anvil at any position of end to end
movement along said path.
2. A perforating device for perforable sheet and strip
materials, said device comprising in combination a punch
and an anvil and a yoke vertically sustained on a car
riage sustaining the punch and anvil in vertical close
spaced alignment with a horizontal perforating zone de
In the speci?c embodiment shown the brake means B 65 ?ned therebetwcen with said anvil mounted on the lower
comprises a split strap 90-91 having one end of each
jaw of the yoke and the punch mounted on the upper jaw
strap secured together and anchored to the frame F? ad
of the yoke, a trackway and wheels mounted ,on said car
jacent to and under the end of the reel R1 by any con
riage to engage said trackway and to sustain the carriage
venient means such as a threaded bolt means 92.
The
movably thereon to actuate thevertically aligned punch
opposite ends of the strap are secured together by a manu 70 and anvil simultaneously forwardly and reversely in a
ally operable means such as a bolt 93 and thumb screw
straight line horizontal path of determined length, a rack
�to actuate the straps 90-91 into and out of frictional
mounted in parallel spaced relation to the trackway, a
engagement with the outer surface of the reel R1. The
gear sustained on said carriage in a position to engage
provision of one of these brake means B at one end of
said rack and to be rotated thereby, a shaft connected to
each reel R1 and R2 will maintain the reel in any desired 75 said gear to be rotated thereby, a cam connected to be
3,031,907
10
tain a sheet of perforable material to be moved into and
rotated by said shaft and a releasable spring urged pin
out of punching position in the space gap between the
punch and anvil.
stop means limiting the rotation of said cam to that rep
resenting the precise distance of travel of said carriage
along said trackway required for end to end alignment
of said punch to limit the distance of travel of the punch
and anvil along said path to a distance providing succes
sive end to end movements of the punch and anvil along
11. The device of claim 10 and means to movably sus
tain a sheet of perforable material with a transverse sec
tion thereof lying in the horizontal plane coinciding with
the space gap between the punch and anvil and means
actuating the said punch to traverse the said transverse
said path, means to feed successive transverse sections of
section in a series of end aligned punching operations.
a length of the sheet and strip material through the perfo
12. The device of claim 1 wherein said punch is pro
rating zone de?ned by the space gap between said punch 10
vided with a plurality of punching pins mounted thereon
and anvil in a direction at right angles to the said path,
in a determined straight sided geometric pattern with the
said means including means sustaining each transverse
peripheral pins on each straight side being arranged to
section in substantial horizontal coincidence with the said
form spaced perforations aligning alternately with the
perforating zone, and means to actuate said punch into
perforating engagement with the anvil-at any position of 15 spaced perforations formed by the peripheral pins on an
opposite side thereby to form an unbroken continuation
, of the geometric pattern in adjacent end and side aligned
end to end movement along said path.
3. The device of claim 1 wherein said punch comprises
a base plate having a plurality of punching pins mounted
thereon in a desired straight sided and four sided geo
metric pattern, the peripheral pins along each straight
side of the geometric pattern being arranged to form
spaced perforations aligning alternately with the spaced
perforations formed by the peripheral pins on an opposite
20
?perforated patterns in the sheet and strip material and
said anvil being provided with a plurality of pin receiv
ing recesses arranged in the same geometric pattern equal
in number to the number of punching pins mounted on
said punch.
13. The device of claim 1 wherein a plurality of pins of
different lengths are mounted on said punch with the dif
side thereby to provide a continuation of the geometric
25
ferent length punching pins each being uniformly dis
persed in the said straight sided geometric pattern and
4. The device of claim 3 wherein a pin guide stripper
plate is mounted in determined spaced relation to the
said base plate, said guide stripper plate having a plu
rality of pin guide bore openings therein equal in number 30
wherein a guide stripper plate is sustained intermediate
the punch and anvil and in spaced relation to the said
pattern in contiguous end and side aligned perforated pat
tern areas in the sheet.
to the number of pins mounted in the base plate and
guide stripper plate being that approximating but larger
than the difference between the longest and shortest length
35
5. The device of claim 3 wherein the said pins consist
of pins having a plurality of lengths with each length pin
uniformly distributed in the geometric pattern on the base
plate surface.
being provided with a plurality of pin guide bore open
ings therein arranged in the same geometrical pattern
with one bore opening for each pin, the thickness of said
aligned axially in the same geometric pattern provided
by the said pins, said openings each having a diameter
approximating but slightly larger than the diameter of the
pin slidably seated therein.
punch to be movable therewith, said guide stripper plate
6. The device of claim 4 wherein the said guide stripper 4 O
plate has a thickness at least approximating the difference
punching pins.
References Cited in the ?le of this patent
UNITED STATES PATENTS
313,383
363,106
484,832
between the longest and shortest length of said pin and
497,566
wherein the spacing between the said base plate and guide
1,582,596
stripper plate approximates but is less than the length
45 1,598,035
of the shortest pin.
1,605,997
7. The devce of claim 1 wherein said anvil is provided
1,722,133
with a plurality of substantially conical bore openings
1,803,180
therein and therethrough arranged in the same geometric
1,925,034
pattern as provided for the said pins on said base plate
1,990,599
with the smaller diameter of each bore opening approxi
2,278,288
mating but larger than the diameter of the pin seating
2,405,714
therein.
2,415,809
8. The device of claim 1 wherein the anvil is immov
2,431,528
able and the punch vertically movable towards and away 55 2,489,583
from the anvil.
2,514,970
9. The device of claim 8 wherein means are provided
2,611,434
for actuating the said punch into and out of engagement
2,632,511
with the said anvil with su?icient force to pattern perfor
ate a sheet of perforable material disposed in the space 60 2,637,396
2,666,595
gap therebetween.
2,890,002
10. The device of claim 9 and means to movably sus
Stimpson _____________ __ Mar. 3, 1885
Wynne ______________ __ May 17, 1887
Van Wagenen ________ __ Oct. 25, 1892
Clarke ____ __? ________ __ May 16, 1893
Grabo ______________ __ Apr. 27,
Barabino ____________ __ Aug. 31,
Stone ________________ __ Nov. 9,
Freeman ____________ __ July 23,
Gargolinski ___________ __ Apr. 28,
Fitzgerald ___________ __ Aug. 29,
Freeman ____________ .._ Feb. 12,
Sadler ______________ .. Mar. 31,
Ryan _______________ __ Aug. 13,
Coffey ______________ __ Feb. 18,
Wells ______________ __ Nov. 25,
Messenger ___________ __. Nov. 29,
Prukett ______________ __ July 11,
Mugler _____________ __ Sept. 23,
Hamilton ____________ __ Mar. 24,
1926
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1942
1946
1947
1947
1949
1950
1952
1953
Spiller ______________ __ May 5, 1953
Eldh ________________ __ Ian. 19, 1954
Thomas ______________ __ June 9, 1959
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