US2539969A

US2539969A - Duplicating machine

Info

Publication number: US2539969A
Application number: US548198A
Authority: US
Inventors: Lafayette H Peevey
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-08-05
Filing date: 1944-08-05
Publication date: 1951-01-30
Anticipated expiration: 1968-01-30

Description

Jan. 30, 1951 L. H. PEEVEY DUPLICATING MACHINE 7 Sheets-Sheet 1 Filed Aug. 5, 1944 Jan. 30, 1951 L. H. PEEVEY DUPLICATING MACHINE '7 Sheets-Sheet 2 Filed Aug. 5, 1944 r A B) Ila W I, r I- I Attorneys Jan. 30, 1951 H, PEEVEY 2,539,969

DUPLICATING MACHINE Filed Aug. 5, 1944 7 Sheets-Sheet 3 I 11 van to r WWW 25. m

Jan. 30, 1951 E 2,539,969

I DUPLICATING MACHINE Filed Aug. 5, 1944 7 Sheets-Sheet 4- Jan. 30, 1951 L. H. PE EVEY DUPLICATING MACHINE 7 Sheets-Sheet 5 Filed Aug. 5, 1944 Inventor m fi e/way HMg Jan. 30, 1951 Filed Aug. 5, 1944 L. H. PEEVEY 2,539,969

DUPLICATING MACHINE 7 Sheets-Sheet 6 Inventor Lara r5 7 722' if. F22- vz-r Jan. 30, 1951 H. PEEVEY DUPLICATING MACHINE 7 Sheets-Sheet 7 Filed Aug. 5, 1944 Attorneys m W. W E

VIIIII IYIIIIIIIIIIIIIA Patented Jan. 30, 1951 2,539,969 DUPLICATING MACHINE Lafayette H. Peevey, Alameda, Calif.

Application August 5, 1944, Serial N 0. 548,198

Claims.

This invention relates to improvements in printing machines of that type which are employed for making duplicate copies of circulars, letters, etc, by the aid of a rotary printing cylinder.

An important object of the present invention is to provide improved friction driving means for the printing cylinder.

Another object of the invention is to provide an improved'printing cylinder and supporting and driving means therefor.

A further object of the invention is to provide a duplicating machine of the above kind adaptedfor rapidly printing reproductions of circulars, letters, etc., on a continuous strip of paper fed from a paper roll, and to provide improved means for automatically cutting the paper strip into sections during the printing operations.

Still another object of the invention is to provide improved means for stopping the traveling movement of the paper strip at a predetermined point during the cutting action.

Other objects are to provide cutting or perforating means to automatically divide the paper strip longitudinally as the printing. operations proceed; to provide an improved rotary stencil cylinder and ink distributing device therefor; and to provide improved means for automatically feeding sheets of paper to the printing cylinder when the use of a continuous strip of paper is not desired.

- Other improved features and details of construction will become apparent from the following description when considered in connection with the accompanying drawings.

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views:

Figure 1 is a side elevational view of a duplieating machine constructed in accordance with the present invention and conditioned for printing on a continuous strip of paper fed from a paper roll.

' Figure 2 is a top plan view thereof.

, Figure 3 is an enlarged fragmentary vertical section taken substantially upon the plane of line ,33 of Figure 2 Figure 4 is an enlarged fragmentary vertical section taken on the plane of line 44 of Figure 1. Figure 5 is a fragmentary plan view illustrating details of the friction driving roller for the print- ;.;"Figure 7 is'an enlarged fragmentary view partly tlonof the mimeograph printing cylinder where.

8--8 of Figure 7.

I Figure 9 is a view similar to Figure 8 taken substantially on the plane of line 99 of Fig-' ure '7.

Figure 10 is a fragmentary plan view of a pormeans is provided to secure the stencil sheet thereon. I Figure 11 is a section on line I II l of Figure 10. Figure 12- is a section on line |2-l 2 of Figure 10. Figure 13 is an enlarged vertical section through theprinting cylinder and adjacent parts, taken view, partly in side elevation and partly broken away and in section, showing the sheet-receivingmechanism employed in Figures 15 and 16.

Figure 18 is an enlarged vertical fragmentary section taken on the plane of line l8-l8 of Fig-. ure 1'7.

Figure 19 is a sectional detail view, partly in elevation, showing perforating discs that may be employed in lieu of the cutters of Figure l.

which divide the continuous strip of paper longitudinally.

Figure 20 is a fragmentary section taken on' line 20-40 of Figure 19.

Referring in detail to the drawings, the present machine includes 'a suitable elongated frame that consists of rigidly connected, spaced side frame pieces 5 connected at their upper edge portions by a bed 6. Intermediate the ends of the frame and mounted transversely of the latter above the bed 6 is a rotary printing cylinder 1,

having friction tires 8 at the ends thereof arranged to bear upon the periphery of a friction driving roller 9 mounted beneath the bed 6 in line with a transverse opening or slot lfl provided in the bed 6, as shown more clearly in Figure 3.

Slot permits the tires 8 to protrude through the bed for engagement with the periphery of roller e, as shown, so that wnen roller :1 is driven, rotation tnereor is im arted to the printing cylinder i. nixed to one end or the roller :1 is a gear ii that meshes with a larger gear l2 fixed on the inner end or a tranverse shait i3 ournaled in a bearing It or the adjacent side irame piece 5, as shown in Figure 4. A bushing i is slidably ntted in the inner portion of bearing I4 and has a iianged inner end-l5 interposed between the inner end of bearing it and the adjacent side of gear 12. Another bushing ii is threaded in the outer portion of bearing HE- and has an enlarged outer end l8 provided with a resilient radially pro ecting lever IS. The outer end of lever is carries a suitable knob or handle and an inwardly pro ecting pin 2i adapted to be selectively engaged in a desired one of an arcuate series of openings 22 provided in the adjacent frame piece 5. A collar 23 is fitted and secured on the shaft :3 at the outer side of the enlarged end it of bushing i1, and the arrangement is such that when the bushing it is turned in 'one direction, it is threaded inwardly to reduce friction between the parts l4, i6, i2, i8- and 23. On the other hand, when the bushing H is turned in the opposite direction, it is threaded outwardly to increase said friction. Accordingly, the position of the handle [9 will govern the friction imposed upon and acting to restrain turningi-ofgear i2. By properly adjusting the bushing .l'i, free rotation of the printing cylinder "i may be opposed frictionally to the desired'degree so that said printing cylinder will stop turning instantaneously or as soon "as driving of gear 12 is discontinued. The outer end of shaft i3 is preferably squared for removable reception of a hand crank 23 that may be employedfor manual driving of gear l2 and printing cylinder 1 if desired. However, gear i2 is preferably motor driven, and for this purpose a motor 24 is mounted in the frame forwardly of shaft [3 and has a pinion 25 on its power or armature shaft that meshes with the gear [2. It will be apparent that the lever l9 may be flexed to withdraw the pin 2| from an opening 22 when adjustment of said lever is desired to vary the frictional resistance to rotation of gear l2.

As shown more clearly in Figures 5 and 6, the driving roller 9 has a shaft whose proecting ends are journaled in bearings 26 provided in corresponding ends of a pair of leaf springs 2! dis-- posed para lel with and inwardly of the frame pieces 5. The other ends of leaf springs 2'! are attached to cranks 28 projecting upwardly from a transverse horizontal shaft 28 journaled in the side 'fra-me pieces 5 rearwardly of the printing The shaft 29 roller 7 and beneath the bed 6. projects at one side of the frame where it has a resilient hand lever 39 secured thereon, said hand lever having a knob or handle 3| at its free end and an inwardly projecting pin at 32, similar to the pin 2!, adapted to selectively engage a desired one of an arcuate series 'of openings 53 provided in the adjacent frame piece 5. By flexing the hand lever 39 outwardly, the pin 32 may be withdrawn from the opening 33 so that said hand" lever 39 may be swung in'eith'er direction to regulate the tension of springs 27 and thereby adjust the pressure with which the driving roller.

9 frictionally engages the tires 8 of the printing cylinder 1. When the adjustment has been. effected, it may be secured by allowing the pin i9 ee. er ie..- we e t e-5;

with. It may be noted at this time that the paper 34 on which the printing is being done is i'rictionaliy engaged between the periphery of the printing cylinder 1 between its tires 8 and the periphery of the driving roller 9- so that said cylinder and roller act to feed the paper rearwaroly during the printing operation. Also, a suitable switch 35 may be provided at one side of the machine for controlling the operation and speed or the motor 24. As shown more clearly in Figure 13, one end of the printing cylinder 1 is journaled in the rim of a circular bearing cap that is rigidly carried by a supporting bracket 31' fixed to the frame piece 5 at the adjacent side of the machine. This end of the printing cylinder projects outwardly beyond the adjacent tire 8 for this purpose, and anti-friction balls 33 or the like are provided in the rim of bearing cap tt'for engagement with the periphery of this end of the printing cylinder. The end of the printing cylinder at the bearing cap 36 has a relatively large central opening at 39 which is effectively closed by the bearing cap 36, and bolts 40 may be emnoyed to secure the bearing cap 36 to the bracket 37 so that the printing cylinder and the bearing cap may be readily unfastened and removed in case it is desired to substitute a new or different printing cylinder.

'While any preferred type of printing cylinder may be employed, that illustrated is of improved construction and is of the perforated type adapted to havea stencil sheet secured thereon. As shown more clearly in Figures 13 and 14, an ink trough M is supported in the upper portion of the printing cylinder and extends from end to end of the latterfcne end of said trough 4| being rigid with the bearing cap 36' and the other end thereof having at its lowest and intermediate point an outwardly projecting tubular shaft 42 closed by a removable plug 53 and rotatably received within a tubular hub A l provided 'on the adjacent end of the printing cylinder, A rotary ink distributing brushdfi of cylindrical form is journaled at one end, as at 46, in the bearing cap 36 and at the other end, as at 41, in an end wall 48 of' The ink distributing brush 45 is" cylinder is rotated, it causes rotation of brush 45' by reason of the engagement of the bristles of brush 55 with the inner surface of the wall 49 of the printing cylinder, and the ink in the trough is taken up by the bristles and transferred through the perforations in the wall 49 of the printing cylinder. Ink is transferred to the trough 4| from an ink reservoir 59 supported by the bearing cap 38 outside and adjacent one end of the printing cylinder. This reservoir has a bottom outlet chamber 5! which communicates with an inlet nipple 52 provided on the bearing cap 33 and communicating with the lower inter-' mediate portion of the trough 4| at the adjacent end or the latter. At its outer side'and in line with the inlet nipple 52, the reservoir 59 has a removable plug 5;, and it will be apparent that when the plugs '33 and 53 are removed, a cleaning implem nt may be passed ent rely through the chamber 5!, nipple 52, the bottom or lower e -9n ti ra lijileefi nstantiate g e" ing purposes. This also permits flushing of theparts for removal of sediment that may accumulate therein or for removal of ink when it is desired to change the color of the latter. The upper or main portion of reservoir 56 is separated from the chamber 5! by a partition 53 having a small opening 54 therein controlled by a needle valve 55. By adjusting th needle valve 55, the rate of supply of ink from the reservoir 56 t the trough 4| may be conveniently regulated. Reservoir 56' has a suitable filler neck 56 closed by a cap 51. In case it is desired to heat the ink in the trough 4| to maintain the same in a free flowing condition, an elongated electrical heating element 58 may be supported by the bearing cap 36 so as to extend directly beneath the trough M from end to end of the latter. A switch 59 may be provided on the side of the machine adjacent the switch 35 for controlling the heating element 58 and regulating the amount of heat generated thereby.

As shown more clearly in Figures 10 to 12, inclusive, means is provided for effectively securing a stencil sheet upon the perforated peripheral wall of the print ng cylinder 1. This perforated peripheral wall d9 has a slot therein extending from s de to side of the cylinder, and the portions 60 of the wall 46 at opposite sides of the slot are directed inwardly toward a concave strip 6! fastened to the inner surface of the wall 49 so as to bridge said slot. A concave clamping strip 62 is arranged between the inwardly directed ends 68 of the wall 49 and the bridging strip BI, and another clamping strip 63 is arranged in the depression formed between the inwardly directed ends 68 of wall 49, clamping screws 64 being passed through the clamping strip 63 and threaded into the clamping strip 62 to draw said clamp-ing strips together. The screws 64 are provided at suitable intervals along the lengths of the

strips

62 and 63, and when the ends of the stencil sheet 65 are folded aro nd the edges of the inturned ends 6i! of wall '39, the screws 64 may be tightened to draw the clamping strips 62 and 53 toward each other so as to firmly clamp the portions of the stencil sheet 65 between said clamping strips and the inturned ends 60. In order to permit insertion a d removal of the

strips

62 and 63, the end wall of cylinder l opposite that at which the bearing cap 36 is located is cut away to conform with the curvature of the bridging strip 62, allowing thestrips 62 and 63 to extend out flush with said end wall of cylinder l, as shown in Figure 12. Also, at this point, the tire 8 is cut away and has spaced ends thereof undercut, as at 66, to receive a bevel ended arcuate insert 6'! by means of w ich the gap between the ends of the tire 8 at this point is bridged to provide a continuous surface for engagement with the driving roller 9. This insert 61 has a flange 68 at its outer side ada ted to overlie the ends of the

strips

62 and 63 when in'position, as shown clearly in Figures 10 and 12. Due to the resilient nature of the tire 8, the insert 61 may be snapped into place for being frictionally held therein. At the same time, it. may be forcibly removed whenever it is desired the. ame e at ihel prwa d endrof. he;

machine. An idler roller 12 is journaled transversely of the frame immediately behind the roll of paper 69 and so that the top thereof is slightly above the bed 6 of the machine. The strip of paper is led from the roll 66 upwardly over idler roller 12 and then rearwardly on the bed 6 so as to pass between the printing cylinder 1 and its driving roller 9, as shown in Figures 1 to 3, inclusive.

Improved means is provided for automatically cutting the paper strip into sections as the printing operations proceed, andimproved means for stopping the traveling movement of the paper strip at the rear end of the machine during the cutting action. These means are best illustrated in Figures 1, 2 and 7 to 9, inclusive, and they consist of a suitable transverse guide frame 13 mounted upon the frame of the machine at the rear end of the latter and having vertically mov able pap-er strip stopping and cutting elements 14 and 15, respectively, mounted therein. The element M consists of an elongated bar disposed transversely of the bed 6 and pivoted to the frame at one end, as indicated at 76, a suitable resilient and frictional facing strip it being secured on the bottom surface of the bar it for engagementv with the upper surface of the paper strip 34, as it passes thereunder. The cutting element 15 consists of a bar carrying a knife 13 and pivoted at one end to the frame of the machine, as at 19. The knife '58 cooperates with a fixed knife 89 secured on the adjacent end of the machine frame. The bar carrying the knife i3 is normally elevated to a position above the bar i iand has a plate 8! attached to the top of its free end, which plate has an end overlying and spaced from the free end of thebar M, as shown clearly in Figure '7. A screw 52 is carried and projects upwardly from the free end of bar 14 and is encircled by a helical compression spring 83 interposed between the plate Bi and the bar '54. Rigid with and projecting upwardly from the plate 8| is a rod 86, through the upper end of which loosely projects one end of an angular lever 83 pivoted at 86 between its ends to a bracket 8"? carried by the adjacent frame piece 5 at a point between the guide frame 713 and the printing cylinder 7. A relatively large and strong helical spring 88 encircles the rod 8:3 between the top of the guide frame 13 and the plate iii. The

springs

33 and 88 normally act to lower the elements is and i5, and the spring 88 is considerably stronger than the spring as. The other or forward end of lever carries a roller 89 arranged to bear upon the peripheral edge of a cam disc es secured to the adjacent end of the printing cylinder 7 by means of bolts 9i and a clamping nut 92 threaded on the hub a l of the printing cylinder. While other forms of cams may be employed, depending upon the lengths into which the paper strip is to be cut, the cam disc 95 which is shown has one peripheral recess es so that the paper s rip is cut I once upon each revolution of the printing cylinder. Also, cam disc St ha arcuate slots 94 through which the bolts 9? extend, thereby permitting rotary adjustment of the cam disc 96 rel.- ative to the printing cylinder so that the paper, strip cutting operation may be caused to occur at exactly the right time. The arrangement is such that the cam disc Gil holds the lever 65 positioned with its rear end or arm elevated for the major portion of a revolution of the printing cylinder, thereby compressing spring 631 and raising the clamping and cutting' elements M and 75. When the rollerBB of lever fis enters the peripheral re:

oess 93 of cam disc '98, the spring 88 is permitted to force the elements l4 and I downwardly. When this occurs, the clamping element 14 first engages the paper strip 31: and clamps it to the bed 6 so as to stop the rearward traveling movement of the paper strip at this point. This is promptly followed by compression of the weaker spring 83 and further downward movement of the cutting eleme t ":5 so that the paper strip is cut by the knives I8 and ac while still being held by the clamping element i i. This action takes place very quickly and the roller 89 promptly passes out of the peripheral notch 93 of cam disc 90 so as to actuate lever 85 and cause it to again elevate the elements is and for the next paper clamping and cutting operation. The downward movement of the rear arm of lever 85 may be properly adjustably limited by means of an adjusting screw 95 threaded through the lever 85 and arranged to engage the top of the guide frame "I3 when the rear arm of lever 35 reaches its lower limit of movement.

Means is provided, which is removable from the machine when not desired for use, for dividing the paper strip 3 3 longitudinally as it is fed through the machine. As shown in Figures 1 and 2, this means may consist of cooperating cutter discs 86 and 97 carried by upper and lower transverse

horizontal shafts

98 and 99, respectively, disposed in superposed relation at a point between the idler roller I2 and the printing cylinder I. Shaft 38 is journaled in removable bearing brackets see mounted upon the frame pieces 5, while shaft 539 is mounted in removable bearings carried at the inner sides of said frame pieces 5. The only time these cutters are used is when the paper strip 3 3- is wider than the width of the desired printed sheet, and, in order to provide for printed strips of varying w'dths, the cutter discs 93 and 9'? are adjustable longitudinally of the

shafts

98 and 93. For this purpose, said cutter discs may have set screws IQI :hreaded through the hubs thereof and impinging the shafts S8 and 99 to secure said cutter discs in adjusted posit-ions. While cutter discs are preferably employed at 93 and 9?, perforating discs may be substituted therefor to divide the paper strip longitudinally, as illustrated in Figures 19 and 20. In the latter figures, a toothed perforating disc I62 is shown mounted on the shaft 93 in place of the cutter disc 96, said perforating disc having tapered pointed peripheral teeth I33 arranged to perforate the paper strip 34 as it feeds past said disc I92. The perforating disc I02 cooperates with a peripherally grooved disc I84 secured on shaft 99 in place of the cutter disc 91, the teeth E93 of the perforating disc I62 being arranged to ride in the peripheral groove I95 of the disc ifi l, as shown in Figures 19 and 20. Preferably, he disc tilt is slit at I536 a short distance inwardly from the peripheral groove I05 and parallel with and midway between the sides of the disc lfl l so that the peripheral or marginal portions of the disc H34 may yield sl'ghtly apart in opera ion. The disc E24 serves as a bearing for the strip 34 while it is being perforated by the disc I02. The discs It; and 84 are adjustable transversely of the machine and longitudinally of the shafts 58 and 98 in the same manner and for the same purpose as the

cutter discs

98 and 91.

In Figures to 18, inclusive, the machine is shown conditioned to feed sheets of paper to the printing cylinder when it is not desired to print one continuous strip of paper fed from a paper roll, asinifiigures 1 and .2. .To'makelthisthe paper strip holding and cutting means is eliminated, and a special paper sheet feeding means is mounted upon the frame of the machine directly in front of the printing cylinder. This paper sheet feeding means consists of a trough I01 mounted upon and bridging the frame pieces 5 "and adapted to have a pile of paper sheets placed therein. At opposite sides of the trough lIi'I are upright levers I 33 pivoted near their lower ends to the sides of the trough Iill, as at I69, for forward and rearward swinging movement. A rod IIO connects and has its ends journaled in the upper ends of the levers I 08, and fixed at their upper ends to the shaft H0 between the levers H18 are rearwardly and downwardly extending paper sheet feeding arms III that are located near the opposite sides of the trough I01. The arms I I I carry paper sheet-engaging pads or feet II 2 at their lower ends, said pads or feet being composed of resilient friction elements which engage the surface of the uppermost sheet of paper on the pile of sheets placed within the trough I07. Transversely adjustable guides H3 are provided in the trough ID'I near opposite sides of the latter, and these are adapted to engage the side edges of the pile of sheets to maintain them aligned. These guides are preferably yieldingly urged inwardly into engagement with the side edges of the pile of sheets by springs I I4.

As shown more clearly in Figures 15, 1'7 and 18, one of the levers I38 has a depending end portion I I5 that extends through a slot I IS in the bottom of the trough I01 and has a link II! pivoted to the lower end thereof. The link I I1 extends rearwardly from the lever I08 and is pivotally connected to an end of a bell crank lever I I8 whose other end has an upwardly extending stop extension I I9 projecting upwardly through an opening I28 in the forward portion of the trough IU'I.

The arrangement is such that when the levers I93 are in their rearwardly swung position with the feet II2 elevated from the pile of sheets in the trough I91, the stop extension II9 will be elevated in front of the rear edges of the pile of sheets arranged in the trough Ill! so as to prevent accidental rearward shifting thereof. It will also be apparent that when the levers I98 are swung forwardly, the arms III are moved forwardly.

'If desired, both of the levers Hi3 may be constructed as described to operate a stop extension I19. Means is provided for operatively connecting one of the levers I08 with the printing cylinder so as to be swung back and forth thereby. For this purpose, an eccentric I2i is secured on the end hub or shaft 4d of the printing cylinder, and an eccentric ring I22 that encircles this eccentric is operatively connected by a rod I23 with an intermediate portion of the lever I98 at the same side of the machine. As the printing cylinder rotates, the eccentric I2I rotates there-v with and rapidly reciprocates the rod I23 to rock the levers I08 back and forth. Upon the forward movement of the levers Hi8, the stop extension II 9 is retracted below the uppermost sheet of the stack and the feeding feet I I2 force the uppermost sheet of the stack rearwardly to the printing cylinder. As the levers I 98 swing rearwardly, shaft H0 is rocked to swing the arms III downwardly, and as the levers I98 are swung forwardly, shaft I If} is rocked to elevate the arms I I I. This is done to lower the sheet-engaging feet I I2 while they are moved rearwardly and to elevate them while they are being moved forwardly. In thisway, the rocking movement of the levers I08 ismainly relied upon to cause the forward shiftin'gfjof'thezs'heets of paper and the rocking of shaft II I) is mainly relied upon to effect the engagement and disengagementof the feeding feet II2 with respect to the paper sheets. For causing rocking of shaft I I0, an arm I24 is secured at one end to said shaft IIOand projects rearwardly there from, arm I24 havinga roller I25 at its rear end arranged to bear upon the periphery of the cam disc I26 secured upon the adjacent end of the printing cylinder in-substantially the same manner as has previously been described with respect to the cam disc at. The cam disc I26 has a peripheral recess I21, and the arrangement is such that the cam disc I26 normally elevates the arm I24 and maintains the feeder feet H2 elevated from the pile of' sheets for the major portion of the revolution of the printing cylinder 7. Once for each revolution of the printing cylinder, the roller I 25 enters the recess I21 and allows the lever I 24 to lower by gravity, thereby rocking shaft H6 and causing the arms III to lower so that the feeder feet IE2 engage the uppermost sheet of the pile. As this takes place, eccentric I2I causes rearward swinging of the levers we so that the engaged uppermost sheet of paper is fed rearwardly to the printing cylinder. As soon as the levers I08 reach their rearward limit of movement, cam disc I26 elevates arm I24 and dis-- engages the feeder feet I I2 from the sheet. The parts remain in this position as the eccentric I2I acts to swing the levers I88 rearwardly for ti e next feeding operation.

From the foregoing description, it is believed that the construction and operation, as well as the advantages of the present invention, will be readily understood and appreciated by those skilled in the art. Minor changes in details of construction illustrated and described are contemplated, such as fairly fall withinthe spirit and scope of the invention as claimed.

What I claim is:

1. In a machine of the character described, the combination with a rotatably mounted printing cylinder, a friction driving roller for said printing cylinder disposed beneath the latter, means forfoperating said driving roller including a power transmitting gear, a machine frame having a hearing at one side, said gear having a shaft fixed thereto that is journaled in and projects outwardly through said bearing, a bushing about the shaft within the inner portion of said bearing and frictionally engaging the outer side of said gear, a second bushing adjustably threaded in the outer portion of said bearing and disposed about said shaft, an abutment collar secured on the shaft outwardly of the second-named bushing, means for rotatably adjusting the secondnamed bushing and coacting with said collar to axially shift the shaft and var the frictional engagement between the first-named bushing and said gear so as to cause stopping of the printing cylinder as soon as driving power is removed from the gear.

2. In a machine of the character described, the combination with a stationary bearing cap, of a revoluble stencil cylinder having an end closed and supported by and rotatably mounted in said bearing cap, said stencil cylinder having a tubular hub at its other end, a member rigid with sa1d bearing cap and extending within said stencil cylinder to the other end of the latter, and a shaft rigid with an end of said member and having said hub journaled thereon.

3. In a duplicating machine, the combination with a revoluble stencil cylinder having peripheral friction tires on the end portions thereof 10 for engagement with afriction driving roller; and a friction driving roller for said cylinder disposed beneath the latter and having its periphery engaged by said tires, said stencil cylinder having a perforated peripheral Wall formed with a transverse slot, the portions of said peripheral wall at opposite sides of said slot being directed inwardly in spaced relation, a strip secured to the inside of said peripheral wall and bridging said slot, a clamping plate disposed between the in-'- turnedportions of said peripheral wall and said bridging strip,'a second-clamping plate disposed in the space between the inturned portions of the peripheral wall, and means to draw the clamping strips together so as to bind a stencil sheet in place on the peripheral wall with the ends of said stencil sheet folded around the edges of the inturned peripheral wall portions.

4. In a duplicating machine, the combination with a revoluble stencil cylinder having peripheral friction tires on the end portions thereof for engagernent with a friction driving roller, and a friction driving roller for said cylinder disposed beneath the latter and having its periphery ena gaged by said tires, said stencil cylinder having a perforated peripheral wall formed with a transverse slot, the portions of said peripheral wall at opposite sides of said slot being directed inwardly in spaced relation, a strip secured to the inside of said peripheral wall and bridging said slot, a clamping plate disposed between the inturned portions of said peripheral wall and said bridging strip, a second clamping plate disposed in the space between the inturned portions of the peripheral wall, and means to draw theclamping strips together so as to bind a stencil sheet in place on the peripheral wall with the ends of said stencil sheet folded around the edges of the inturned peripheral wall portions, a tire of the stencil cylinder being cut away at a point coincident with said clamping strips so as to provide spaced ends on the tire, said'ends of the tire being undercut, and a removable insert for bridging the space between the tire ends resiliently and frictionally retained in place between said ends and by the latter.

5. In a duplicating machine, the combination with a revoluble stencil cylinder having peripheral friction tires on the end portions thereof for engagement with a friction driving roller, and a friction driving roller for said cylinder disposed beneath the latter and having its periphery engaged by said tires, said stencil cylinder having a perforated peripheral wall formed with a transverse slot, the portions of said peripheral wall at opposite sides of said slot being directed inward ly in spaced relation, a strip secured to the instrips together so as to bind a stencil sheet n side of said peripheral wall and bridging said slot. a clamping plate disposed between the inturned portions of said peripheral wall and said bridging strip, a second clamping plate disposed in the space between the inturned portions of the peripheral wall, and means to draw the clamping place on the peripheral wall with the ends of said stencil sheet folded around the edges of "the inturned peripheral wall portions, a tire of the stencil cylinder being cut away at a point coincident with said clamping strips so as to provide Quter side ovs y p th end 9i We clam qg Num e 3 3 9$? ships? at the adjabent'end oi the siegcil i dan 833,85 St e 1.q- Oct, 23,. 19.06 'j 'f' ff v j 853,605

stickne Ma y1

4, 19,07 LAB AYETTE PEEVEY 1,102 Fuerth July 2 3,,190 ,7 v REFERENCE$ 011m; 5 1,056 983 rm, v--.- Mar-1,9 7.3 The following reierences are of record in, the 1 4. Dick ..1 --.---.v M .-2 l3 file of this patent: 5 9 0 hatq z 1". O t- 19 1,739,264; Si pson- Dec. 10, 1929 D TA s PAT S 1,964,49 Brasseur June 2 934 Number Name, Date 19 1,977,56 Echhard Oct. 16,1934; 398,042 Harrispn V Y Feb. 1 1889 2,0 0,385 Shurley, et a1, Nov. 10., 1 403,082 Adams e1; a1, May 14,1889 2,112,341 Klemm Mar. 29 1933