US 2760576 A
Description (OCR text may contain errors)
Aug. 28, 1956 D. w. c. SPENCER ROTARY FERFORATING APPARATUS 3 Sheets-Sheet 1 Filed March 26, 1954 INVENTOR ATTORNEY Aug. 28, 1956 o. w. c. SPENCER 2,760,576
ROTARY PERFORATING APPARATUS Filed March 26, 1954 5 Sheets-Sheet 3 um nnn-nunnnn Z5 n nooununnunum'nunun INVENTOR flIlDLEY W C. SPENCER ATTORNEY ROTARY PERFORATING APPARATUS Dudley W. C. Spencer, Wilmington, DeL, assignor to E. I. du Pont de Nernours and Company, Wilmington, DelL, a corporation of Delaware Application March 26, 1954, Serial No. 418,917
9 Claims. (Cl. 16499) This invention relates to improvements in web perforators and particularly to rotary perforating apparatus utilized for forming the guide perforations in photographic film and the like.
It is essential that the perforations in photographic film be precisely cut and to a close pitch tolerance, since the high speed feeding of the film is dependent on the exact matching and engagement of the feed sprocket wheels with the film perforations. At the same time, from the standpoint of economical production, such film perforation must be accomplished at extremely high speeds. Apparatus for this purpose should be as simple of construction as practicable, to reduce maintenance cost, While being compact and rugged to meet the demands of modern manufacturing operations.
A principal object of this invention is to provide a film perforator which is adapted to operations at very high speeds. Another object is to provide an apparatus having individual perforator assemblies which are absolutely fixed in their orientation with respect to the driving mechanism, so that an extremely high precision of perforation is obtained at all times. Another object is to provide a perforating apparatus wherein individual perforator assemblies may be readily removed for re sharpening or servicing whenever such rehabilitation becomes necessary in the course of service life. Yet another object of this invention is the provision of a perforating apparatus which is compact, simple and cheap in first cost and which has a relatively long operating life.
The manner in which these and other objects of this invention are attained will become apparent from the detailed description and the following drawings in which:
Figure l is a side elevation, viewed partly in section, of one embodiment of apparatus constructed according to this invention,
Figure 2 is a full-section view taken along line 2-4 of Fig. 1,
Figure 3 is a full-section view taken along line 3-3 of Fig. 1, showing a length of film in process of perforation,
Figure 4 is a fragmentary side elevation, partly in section, of the wheel supporting the perforator assemblies, the assemblies being omitted therefrom,
Figure 5 is a full-section view taken along line 5-5 of Fig. 4,
Figure 6 is a side elevational view of a modification of perforator assembly, showing the camming edge of the associated cam ring,
Figure 7 is a rear end elevation of the perforator assembly shown in Figure 6 looking in the direction of the punch and die elements,
Figure 8 is a front end elevation of the perforator assembly of Figs. 6 and 7, and
Figure 9 is a plan view of a length of film perforated by the apparatus of this invention.
Generally, the apparatus of this invention comprises a rotatable web-supporting wheel which is journaled on a stationary shaft, which wheel carries a multiplicity of hired states Pate perforator assemblies mounted in fixed position around the periphery of the wheel, and one or a pair of circular cam rings mounted eccentric to the wheel, and driven rotatably in unison therewith, the cams overlying the perforator assemblies on the Wheel and progressively urging the punch elements of the perforators into cutting position and then clearing them sufiiciently for their withdrawal in sequence during rotation of the wheel and cam rings. In a preferred embodiment the apparatus is adapted to the simultaneous perforation of both edges of the film or other web, and special provision is made to feed the film into the apparatus and collect the finished product after perforation without damage thereto due to scratching or pinching by the machine parts.
Referring to Fig. 1, one embodiment of this invention comprises a main shaft 5 which is drilled axially at 6 to permit vacuum Withdrawal of cut-out film slugs in the course of operations. Shaft 5 is stationary and is supported in cantilever relationship with respect to the machine frame 8, being mounted with a slip fit Within drilled passage 9 formed in the frame. Shaft 5 is provided with an 'arcuate keyway 10, receiving the inner end of quickrelease lever 11 provided With a pivot pin 12, which is rotatably supported within a drilled hole 13 in frame 8, so that the shaft and the entire mechanism supported by the shaft may be readily withdrawn for servicing or replacement whenever required. An annular vacuum sealing washer 16 is provided coaxial shaft 5 at the frame end of the shaft to seal drilled passage 6 against air leakage from the outside.
Drive bushing 19 is journaled on shaft 5 through bearings 20 and the outer end is provided with gear teeth 21 meshing with flexible drive belt 22, which may be a conventional Gilmer belt or the like. Cam ring 25 is fixedly attached to bushing 19 by set screws, one of which is shown at 26 in Fig. 1 and, in the embodiment shown, cam ring 25 is mounted concentric with shaft 5.
The film-supporting wheel 29, shown in Fig. l, is unitary in construction to permit the simultaneous perforation of both edges of the film, only the left-hand half of the Wheel, i. e., that part shown in section, appearing in Fig. 1. In the embodiment shown, wheel 29 is journaled eccentrically on shaft 5 through a pair of bearings 30, one of which is hidden from view behind cam ring 25', which accomplishes the same function for the right-hand side of the film as 25 does for the left-hand side. Wheel 29 is provided with a number of radial vacuum passages 32 (refer also Fig. 3) which open at their inward ends into an annular passage 33 formed on the periphery of shaft 5. The outer ends of passages 32 are disposed adjacent to the undersides of the die elements 36 of the perforators and are of somewhat larger diameter than the die elements to facilitate the vacuum removal of cutout film slugs. Preferably, passages 32 are slightly tapered to a larger bore in the direction of shaft 5 to facilitate the ready withdrawal therethrough of the cutout slugs.
The embodiment of apparatus hereinabove described utilizes concentrically mounted cam rings 25 and 25' and an eccentrically mounted wheel 29; however, it will be particularly understood that this relationship may equally well be reversed, i. e., wheel 29 can be concentrically mounted and cam rings 25 and 25' eccentrically mounted, since relative eccentricity between these members is the sole requirement for proper functioning. This relative eccentricity can be rather small and, in the embodiment detailed, which is provided with ninety-two individual perforators, the cam rings of which have maximum outside diameters of 7", is With the eccentricity indicated at a in Fig. 1, the inner annular edges of cam rings 25 and 25' are closest to the axis of wheel 29 at the six oclock position, or point c of Fig. 3, and during an appreciable angle of rotation preceding this point the cam rings depress the punch elements of the perforators into their associated die elements, thereby effecting the perforating operation. The clearance between the inner annular edges of cam rings 25 and 25 and'the axis of wheel 29 is greatest diametrically opposite the perforating region, reaching its maximum at the twelve oclock position of Fig. 3, and the punch and'die elements of the perforators are clear of one another, and of the film, over an appreciable angle of travel preceding and following this point, so that film can be readily fed to and withdrawn from the device in this region without scratching due to contact with the elements of the perforators carried by the apparatus.
Referring to Fig. 3 especially,'it will be noted that shaft is drilled with four passages 38 of somewhat larger diameter than passages 32, which passages open at their outer ends into annular passage 33 and at their inner ends into passage 6. The course of cut-out slugs is thus from the perforators through die element's 36 and passages 32, 33 and 38 in sequence, thence into'drilled passage 6 and out to the left, as seen in Fig. l, to a suitable collector maintained under vacuum by equipment not shown. It will be noted that the drilled passage 6 of Fig. 1 extends to the right where it communicates with an identical slug removal passage arrangement for the right-hand perforating side, which is enclosed in cam ring 25'.
Referring to Figs. 1 and 2, film supporting wheel 29 is provided at its end adjacent drive bushing 19 with two drive pins 40 securely attached to the wheel, which drive pins support individual rollers 41 journaled on the pins through bearings 42. Disposed between the adjacent ends of drive bushing 19 and film supporting wheel 29, in loose movable relationship thereto, is plate 43 provided with radially machined recesses 44 adapted to cooperate with rollers 41 in slide fit contact. A pair ofrollers 45, similar in all respects to rollers 41, but disposed in alternation therewith at an angular spacing of 90", are journaled through bearings 46 on pins 47 fixedly secured to drive bushing19. Thus, the assembly 43, together with the pairs of rollers 41 and 45, constitutea type of Oldham coupling, and it will be understood that rotation of drive bushing 19 through drive belt 22 produces rotation of film-supporting wheel 29 by virtue of the positive coupling connecting the bushing and wheel elements.
Cam ring 25 is partially broken awayin Fig. l to show the drive connection between the right-hand side of wheel 29 and right-hand cam ring 25', the-coupling. being in all respects identical to that already described, except that the direction of power transmission is in the reverse direction to that for the left-hand side, i.-e., through pins 40', rollers 41' journaled thereon, plate 43', rollers 45' andpins 47' to cam ring 25', which is journaled on shaft 5 through bearings not shown.-
Referring to Figs. 4 and 5, the periphery of wheel 29 is machined around the entire outside expanse with a multiplicity of axially aligned grooves 50 which are adapted to support the perforations in fixed circumferential relationship with respect to each other. Circumferential grooves 51 are provided for the reception of guide-portions on the perforators to locate them axially ofthe wheel. Thus, the pitch of perforation and the spacing of perforations with respect to the edges of the film is insured to an absolute degree during operation.
Two types of perforators are hereinafter described, the first type being shown in detail in Fig. 1, while a modification is shown in Figs. 6, 7 and S. The perforators shown in Fig. 1 areof the automatic-returntype, each comprising a base portion 52 undercut at 53, thebase portion being provided with a beveled front foot configuration at 54 adapted to fit within circumferential groove 51. The perforators are also provided with a rear foot portion 55 adapted to fit within the axial groove 50 on wheel 29 allotted to each individualperforator. The
perforators are secured in grooves 50 in fixed relationship.
to wheel 29 at the rear by arcuate spring stock strap 59, provided with a curved outer edge overlying the rear ends of all of the perforators and attached to wheel 29 by machine screws 60. The front ends of the perforators for both edges of the film are similarly retained against wheel 29 by arcuate spring stock strap 61, which is overlaid by arcuate film support members 62, a multiplicity of these supports being provided in complete encirclement of wheel 29. The outer surfaces of support members 62 arernachined to a high surface" finish to avoid marring of the film during'the perforating operation and are provided with countersunkholes to receive snugly the heads of machine'screws 63 which engage with. tapped threads in wheel 29, thereby providing common attachment of elements61 and 62 with'the wheel.
The top surface of each of the perforator bases 52 is provided with a limiting stop lug 66, which limits the radial movement of the associated punch element 67 into registration with the associated die element 36. Each punchelement 67 is fixedly secured to the outer end of a spring metal support 68 and an outer spring metal leaf 69 is provided to overlie at its outer end punch element 67, thereby furnishing a wear surface for abutment with the carnming surface of the associated cam rings 25 or 25. Support 68 and leaf 69 are attached as cantilevers at the ends opposite the punch to perforator base 52 with rivets 70. Fromthe foregoing it will be seen that all elements of the perforators are assembled in fixed relationship to one another, so that it: isimpossible for a punch to become misaligned with its associated die as a result of wear in the course of use. Consequently, hard metals can be utilized in the construction of both punches and dies with complete assurance that no difiiculties will arise from metal interference. The use of flexible spring supports 68, carrying thepunches 67, in conjunction with stop lugs 66 renders unnecessary the use of highly accurate cam profiles on rings-25 and 25' and contributes to economy in fabrication. Stop-lugs 66 are likewise useful as reference surfaces in sharpening punches 67 after they have-become dull as a result of extensive service.
Referringto Figs. 1 and 3, the operation of the apparatus of this invention is hereinafter described for the condition of counter-clockwise rotation of wheel 29 and cam rings 25 and 25*, although it will be understood that operation in the reverse direction'is equally feasible if the feed of the film isreversed- The unperforated film-72 enters the apparatus-at the left, as seen. in Fig. 3, and is carried around wheel 29 during its rotation through anany of theelements of the perforating apparatus. This is conveniently accomplished by passing the film between pairs of-peripherally grooved idling rollers 74 located ahead of the entrance point and past the exit point, re-
spectively, which contact-exclusively the edges of the ruinningfilm and temporarily bow it. This bowing is indicated at 75, the degree of which is sufficient so that the film edges are laterally clear of the punches 67, their supports 68 and the edges of cam rings 25 and 25 in the course of assuming the normal flat state between the open punch and die sets at points I) and a. During the first of travel from point b to point e, punches 67 are cammed by rings 25 and 25' towards their associated dies 36, cutting the perforations in-the film, the punchesattaining their maximum inward advance at point 0. Cutout film slugs'drop-into passages 32 and, either at once or during subsequent rotation of wheel 29, are ejected from the apparatus through passages 33, 38 and 6.
Duringrotation of wheel 29 from point 0 to point d, punches 67-a1'e progressively withdrawn from dies 36 as spring supports 68 and leaves 69 are permitted to return to their normal, unstressed positions under increasing clearance between cam rings 25 and 25 and wheel 29 due to the relative eccentric motion of these members. At point d, the punches 67 are completely free of the film and draw otf is therefore readily effected under the bowing action of the exit rollers 74. Fig. 9 is a plan view of a short length of perforated film 73 produced on apparatus according to this invention. Experience in operation has demonstrated that extreme precision of pitch and spacing is obtained at a typical rotational speed of 360 R. P. M., corresponding to a linear film throughput of 500 ft./ min.
At start up the lead end of the bowed film to be perforated is fed into the apparatus and carried around wheel 29 as the wheel, together with the cam rings, is turned by hand. When the perforated end emerges from the apparatus in the vicinity of point d, it is threaded between the pair of bowing rolls 74 along the line of exit and thence led to a take-up reel or other device, whereupon powered operation can be initiated. It will be understood that the perforator punches and dies themselves, by engagement with the film, function to some degree as sprocket teeth and permit film feed through the apparatus under substantial tension. This is an advantageous feature of this invention, because it obviates stripping devices and, by regulation of the tension applied to the film during perforation, as by feed over weighted idler rolls or similar devices, it is possible to control the pitch of perforation to an extremely close tolerance.
Figs. 6, 7 and 8 show an alternate form of perforator which is adapted to use with the wheel 29 already described with reference to Figs. 4 and 5. The perforator base 80 is similar in form to perforator base 52 hereinbefore described and is provided with front and rear foot portions 81 and 82, respectively, the former of which seats in groove 51 and the latter in its allotted groove 50. This design of perforator is mounted on the wheel 29 in an identical manner to that described for the perforator of Fig. 1. The principal difference between the two perforator designs is the provision for positive actuation of the punch in the design of Figs. 68, which is achieved by mounting the punch 67 on a rigid support member 83 formed with a clevis 84 at its inner end, member 83 being pivotally mounted for free movement in a direction generally radial of wheel 29 on pin 85 journaled in base 80. The bores of the clevis legs receiving pin 85 are provided with diametrical slots 86 and are drilled somewhat undersize, so that a tight assembly of the pins in the bores is obtained by the inherent spring action of the construction, thus compensating for frictional wear which would eventually result in objectionable looseness at these points. The upper forward end of support member 83 is provided with a forked follower 87 adapted to receive in sliding contact therewith the camming edge of am ring 25, which is in this case preferably formed to a somewhat rounded bead at 88 to reduce friction to a minimum.
The operation of the perforator of Figs. 6-8 is in all respects identical with that described with reference to the perforator construction of Figs. 1 and 3, except that the advance and withdrawal of the punch 67 with respect objectionable because of permanent deformation of the.
The double-edge perforating apparatus hereinabove de-' scribed in detail is preferred for film perforation; however, where single-edge perforation is desired, it will be apparent that a single cam ring operating in conjunction with a wheel provided with an appropriate network of vacuum slug-removal passages constructed as herein disclosed can be advantageously utilized, and both single and double-perforating embodiments are therefore comprehended within my invention.
While the embodiment of this invention which has been herein described in detail is particularly preferred, because the arrangement of the apparatus components permits ready accommodation of the design to conventional film manufacturing apparatus supplying raw film to and receiving perforated film from the device, and from the standpoint of maintenance and the substitution of particular sizes of apparatus for use with particular widths of film, it Will be understood that the shaft on which the filmsupporting Wheel is mounted may be journaled at both ends, as distinguished from being mounted in cantilever relationship and, furthermore, that the shaft may be supported either horizontally, vertically or at any other angle suited to the particular requirements of the user. Also, while a vacuum cut-out slug withdrawal system is preferred for best results, a superatmospheric pressure air jet directed radially inward toward the shaft at a point following the perforation Zone will clear cut-out material quite as effectively as a vacuum. A combination of a superatmospheric blast from the outside and vacuum applied on the inside has added advantage and, of course, positive air pressure may be applied to a region following the perforation zone from the inside of the wheel in a direction opposite from that effected by vacuum removal as hereinabove described. In the event that the slugs are removed by blasting outwardly of the Wheel 'a vacuum head may be utilized for collection and transfer to a suitable waste receptacle or, where the shaft is mounted vertically, th lowermost cam ring may be provided with suitable openings in the region of its attachment to the shaft to permit gravity collection of the slugs. It is also possible to rely exclusively on external vacuum or pressure applying apparatus, or both, for slug removal, with complete elimination of the passages in the shaft and the film-supporting wheel, 'and it is intended to encompass all of these and any equivalent variations within the term means for cut-out slug removal as this term is hereinafter employed in the claims.
It will further be apparent that a great variety of driving arrangements may be utilized for turning both the cam rings and the web-supporting wheel and, while the use of loose couplings as hereinabove described is particularly preferred, other driving arrangements known to persons skilled in the art are equally efiective for the purpose contemplated.
From the foregoing it will be understood that I have provided an improved perforating apparatus useful in the perforation of photographic films or like web materials and that many modifications may be made in my invention without departing from its essential spirit, wherefor I intend to be limited only by the scope of the following claims.
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A rotary perforating apparatus comprising the combination of a frame, a stationary shaft journaled on said frame, cam rings corresponding in number to the number of edges of the web it is desired to perforate journaled on said shaft, each of said cam rings being provided with a camming surface, a web-supporting wheel journaled on said shaft, one of the pair consisting of said cam rings and said web-supporting wheel being journaled in eccentric relationship to the other, at least one web perforator fixedly secured to the outside periphery of said web-supporting wheel at a location for co-operation with individual ones of said cam rings, each said perforator being provided with a punch element and an associated die element, the punch element of saidperforator underlying the cammingsurf'ace of the ring cooperating with it andbeing depressible by said cam ring into perforating relationship with the die element associated with said punch at the point of minimum clearance betweensaid cam and said web-supporting Wheel and being movable outwardly in a generally radial direction a sufficient amount to clear completely the surfaeeof a web carried by said web-supporting wheel at the point of maximum clearance: between said cam ring and saidweb-supporting wheel, means for cut-out slug removal, and means for rotating in unison said: cam rings and said web-supporting Wheel.
2. A rotary perforating apparatus according to claim 1 wherein said p'erforator comprises in combination a rigid base member provided with a die element, a spring sup port fixedly secured in cantilever relationship to said base member, a punch element fixedly secured to the end of said support opposite the end at which said support issecured to said base, said punch element registering with said die element when said support is biased in the direction of said base member but clearing said die by an amount greater than the thickness of said web when said support is in the unbiased state, and a spring leaf fixedly secured in cantilever relationship to said base member, the free end of said spring leaf overlying the end of said punch element opposite said die element and being interposed between said oamming surface. of said cam ring and said punch element.
3. A rotary perforating apparatus according to claim 1 wherein said perforator comprises in combination :a rigid base member provided with a die element, a rigid. support journaled at one end on said base member, a. punch e1ement fixedly secured to the end of said support opposite the end at which said support is journaled on said base member, and forked follower means fixedly secured to said support and engaging with said camming surface of said cam ring, whereby to bias said punch element into registration with said die element at said point of minimum clearance and lift said punch element free of said web at said point of maximum clearance.
4. A rotary perforating. apparatus comprising the combination of a frame, a stationary shaft member mounted in cantilever relationship on said frame, cam rings corresponding in number to the number of edges of the web it is desired to perforate journaled on said shaft, each of said cam rings being provided with a oamming surface, a web-supporting wheel journaled on said shaft, one of the pair consisting of said cam rings. and said web-supporting wheel being journaled in eccentric relationship to the other, at least one web perforator fixedly secured to the outside periphery of said web-supporting wheel at a location for co-operation with individual ones of said cam rings, each said perforator being provided with a punch element and an associated die element, the punch element of said perforator underlying the camming surface of the cam ring co-operating with it and being depressible by said cam ring into perforating relationship with the die element associated with said punch at the point of minimum clearance between said cam ring and said web-supporting wheel and being movable outwardly in a generally radial direction a sufiicient amount to clear completely the surface of a web carried by said web-supporting wheel at the point of maximum clearance between said cam ring and said web-supporting wheel, intercommunicating conduits in said Web-supporting. wheel and said shaft to permit vacuum cut-out slug withdrawal from the die element of said perforator, and means for rotating in unison said cam rings and said web-supporting wheel.
5. A rotary perforating apparatus comprising the combination of a frame, a stationary shaft mounted in cantilever relationship on said frame, a cam ring provided with a camming surface journaled on said shaft, a web-supporting wheel journaled on said shaft, one of the pair consisting of said cam ring and said web-supporting wheel being journaled in eccentric relationship to the other, at
least one web perforator fixedly secured to the outsideperiphery of'said web-supporting wheel, each said perforator being provided with a'punch element and an assoelated die element, the punch elementof said perforator underlying the camming surface of'sai'd cam ring and being depressible by said cam ri'ng into perforating relation-- ship vv'ith'the die element associated with said punch at inter-communicating conduits in said web-sup orting wheel and said shaft to permit vacuum cut-out slug withdrawal from the die element of said perf'orator, and means for rotating in unison said cam ring and said web-supporting wheel.
6 A rotary perforating apparatus comprising thecombination of'aframe, stationary shaft mounted in cantilever relationship on said frame, a cam ringprovided with a camming'surface journaded on said-shaft, 'a web-supportingwheel journaled on said shaft, one of the pair consisting of said cam ring and said web-supporting wheel being iournaled in eccentric relationship to the other, at least one web perforator fixedly secured to the outside periphery of said web-supporting wheel, each said perforator being'provided with apunchelement and an associated die element, the punch element ofsaid perforator underlying the cam'm-ing surface of said cam ring and being depressible' by said cam ring into perforating relationship withthe die-element associated with said punch at the point of minimum clearance between said cam ring and said web sup'portin'g wheel and being movable outwardly in a generally radial direction a sulficient amount to clear completely the surface of a web carried by said websupporting wheel at the point of maximum clearance between said cam ring and said web-supporting wheel, intercommunicat-ing conduits in said web-supporting wheel and said shaft to permit; vacuum cut-out slug Withdrawal from the die element of said perforator, a positive torquetransmitting coupling connected between said cam ring and said web-supporting wheel, and rotationaldrive means: connected to one of the. pair consisting of said cam ring and said web-supporting wheel.
7. A rotary perforating apparatus comprising the combination of a frame, stationary shaft mounted in cantilever relationship on said frame,'two cam rings each provided with a carnrning surface journaled on said shaft with said ramming surfaces adjacent one another, a web-supporting wheel iournaled on said shaft, one of the pair consisting of said cam rings and said web-supporting wheel. being journaled in eccentric relationship to the other, at
, least two web perforators fixedly secured to the outside periphery of said websupporfing wheel, each of said perforators being provided with a punch element and an associated die element, one of said perforators being disposed on said wheel for cooperation with one of said cam rings and the other of said perforators being disposed on said wheel. for co-operation with the other of said cam rings, the punch elements of said perforators underlying,
the camming surfaces: of said cam rings in co-operation with each said perforator and being depressible. by said cam rings into perforating relationship with the die elements associated with said punches at the point of minimum clearance between said cam rings and said websup'porting wheel and being movable. outwardly in a gen erally radial direction a suflicient amount to clear completely the surface of a web carried by said web-support ing wheel at the. point of maximum clearance between said cam rings and said web-supporting Wheel, intercommunicating conduits in said web-supporting wheel and said shaft to permit vacuum cut-out slug withdrawal from the die elements of said pcrforators, and means for rotat ing in unison said cam rings and said web-supporting wheel.
8. A rotary perforating apparatus comprising the combination of a frame, a stationary shaft journaled on said frame, camming members corresponding in number with the number of edges of the web it is desired to perforate journaled on said shaft, a Web-supporting wheel journaled on said shaft, one of the pair consisting of said camming members and said web-supporting wheel being journaled in eccentric relationship to the other, one or more web perforators fixedly secured to the periphery of said Websupporting wheel at a location for co-operation with individual ones of said camming members so as to be operable inwardly and outwardly in sequence to perforate and clear completely a web carried by said web-supporting 10 wheel, means for cut-out slug removal, and means for ID- tating in unison said cramming members and said websupporting wheel.
9. A rotary perforating apparatus according to claim 8 having means for feeding said web onto and removing said web from said web-supporting wheel.
References Cited in the file of this patent UNITED STATES PATENTS 1,559,987 Reinhardt Nov. 3, 1925 1,910,395 Kreis May 3, 1933 2,619,177 Praturlon Nov. 25, 1952 FOREIGN PATENTS 179,718 Great Britain May 28, 1922