US1687003A - Stencil duplicating machine - Google Patents

Description

E. J. BRASSEUR STENCIL DUPLICATIHG MACHINE Get. 9, 1 928.

Original Filed Oct. 8, 1925 5 Sheets-Sheet 1 INVENTOR i ATTORNEY Oct. 9, 1928.

E'. J. BRASSEUR STENCIL DUPLICATING MACHINE INVENTOR 13 Sheets-Sheet 2 Original Filed Oct. 8, 1925 Oct. 9, 1928.

E. J. BRASSEUR STENCIL: DUPLICA'IING MACHINE Original Filed 001;. 8, 1925 INVENTOR ATTORNEY Patented Oct. 9, 1928.

cnrreo "STATES PATENT Ol P'lQE.

ERNEST J. BRASSEUR, OF CEIGAGO, ILLINOIS, ASSIGNOR TO A. B. DICK COMEANY, 0F CHIGAGO, ILLINOIS, A CULRPORATXON 0F ILLIIEI'OIS.

STENCIL DUPLICATING MACHINE.

Original application filed October B, 1925, Serial No. 61,172. Divided and this application filed November 2, 1926.

This invention relates to stencil duplicating machines. and more particularly to rotary stencil duplicating machines;wherein a sheet oi paper fed into the machine is trio- 5 thinally eng ged between the rotatable cylinder and a tree rubber roller so as to be drawn through the machine upon the rotation of the cylinder, and to rcceiye the impression from the stencil sheet on the cylinder. The stencil sheet is supplied with printing; ink from the interior or" the cylinder, wherein is disposed an ink chamber or resewcir. In one form of construction there is a sealed ink chamber within the cylinder from which ink may permeate through a diaphragm on the cylinder to an ink pad covering the diaphragm, and

l hence to the stencil sheet which is laid eye:

the pad; and there within the iul; chamber a tiltable ink trough from which the operator ma y spill inh to renlenish the stencil sheet ie printed upwardly against the inked, rotating stencil sheet to cause the stencil sheet to imprint an impression on the upper surface of the paper. Very often, however, the cylin der is rotated without a sheet being interposed between the cylinder and the rubber roller, and if during such rotation the rub ber roller should contact the inked stencil sheet on the cylinder, this roller would receive inl'c therefrom, with the result that the machine could not be used until this inlt has; been completely cleaned from the roller liltherwise paper sheets subsequently passed between the u' inder and roller would receive ink on their backs from the rubber roller, and the sheets would be spoiled.

This application is a division of an application tiled by me Uctober 8, 1925, for stencil duplicating machines, Serial No. 6i,1"i'2.

in said application there disclosed, among other features, mechanism which positirely prevents the rubber roller from re ceivinp; ink from the surface ot' a stencil sheet the cylinder, and at the same time operatingr automatically to press each sheet of paper to be printed against the rotating cylinder and inked stencil sheet thereon in such manhber rollcr presses each paper sheet to 1161' and with such pressure that each sheet receives the desired impression from the stencil sheet, and is positively drawn through divi- Serial No; 145,?60.

sional {"LPPllCZllllOll is directed is to the provision of means for rounding out the periphery of the printing cylinder so as to present a smooth and even cylinder surface for the rubber impression roller to roll on as the cylinder revolves in contact therewith, and at the same time permitting the presence of means whereby the inl: pad and stencil sheet may be conveniently secured to and removed from the cylinder.

A further object of this invention is to provide improved mean for attaching the inking pad and stem sheet to the machine, which means permit the pad to be reversed endwise which clamp the stencil sheet to the cylinder in such a way to relieve the strain of the stencil sheet stub agaii st the hooks there'lor; and which prevent ink from going ieyond the ends of the fabric of the ink pad and stencil; and another object of this invention is to provide means of this character which are simple, coun iact, and durable, and which are readily and y :uiljustable on and removable from the machine to permit replacement of a stencil sheet and inking pad.

Other objects of my invention will be in part obvious and in part pointed out herein after.

The invention accordingly consists in the features of construction, arrangement 0t parts and coinbinations of elements which will be lescribed more fully hercinuittcr, and the scope oi the application oil which will be indicated in the claims that follow,

In order that a clearer understanding of my invention may be had, attention is hereby directed to the accompanyi. Q drawings forming part of this application and illustrating certain possible enilnnliments of this invention. Referring to the drawings, 1 a top p in View of a cylinder ei'nbodying this invention, the stencil sheet mounted thereon being shown broken away, and the supplcn'iental tlrame plate being absent; Fig. 2 is a front View, partly in section, of a tragnent oi the cylinder, broken away at the center, with th, supplementalry t'raine plate in position thereon; Fig. 3 is; a frugmontary sectional View thereof, and is taken on the line 3-3 of F 2; 4i is a sectional View of a fragment thereof, and is taken on the line il olt 2, the :ipplementary -frame being: shown in place on the cylinder; and 5 is a view similar to Fig. 4 but showing the supplementary frame plate detached and raised from the cylinder.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring to the drawings, the cylinder 1n eludes two opposite side walls 150 and 151, having peripheral flanges 152 and 158. A sealed ink compartment is formed within the cylinder, the compartment having side walls 154 and 155, flanged at 156 and 157, beneath the flanges 152 and 153 of cylinder walls 150 and 151. Extending between walls 150 and 151, and embracing a major part of the circumference of the cylinder, is a perforated diaphragm 158, which has its side edges tightly secured between the flanges 152 and 156 on one side and between the flanges 153 and on the other side. These seams or joints are leak-proof. Embracing the remainder of the circumference of the cylinder is a plate 160, the body of which is depressed below the surface of the cylinder. This plate has raised side flanges 161 and 162, flange 161 being secured between flange 156 of wall 154 and flange 152 of wall 150, and flange 162 being secured between flange 15'. of wall 155 and flange 153 of wall 151, the joints being leak- )roof. 1 The ends 163 of plate 160 are curved upwardly against the under surface of the adjacent edge portions 163' of the diaphragm 158 and are secured thereto along a leak proof joint. The ends of plate 163 and diaphragm 158 establish beveled surfaces or seats 16l.

Plate 160 is provided with a filling opening 177 and a cap 178 therefor, to permit ink to be poured into the trough 168, suspended from the cylinder shaft 165 within the sealed ink compartment.

Behind the diaphragm 158 is a grille or grid structure 180 which aids in spreading over the diaphragm the ink spilled from trough 168.

The diaphragm 158 is covered by an ink pad, and the stencil sheet 33 is laid on this pad. The ink pad comprises a sheet of suitable fabric 182 to each end of which is secured a strip of metal 183. The ink pad is secured to the cylinder by engaging the inner edge of the plates 183 within the grooves 187 formed by the bent edges 1.63 of the plate 160, and moving slid-able latches 189 over the 0p posite edges of plates 183. These latch plates 189 are slidably reta ned under straps 190 secured on the top of plate 160. Preferably the plates 183 are both alike so that the ink pad may be reversed, or turned over on the cylinder. By changing the pad around from time to time its life may be extended.

Also on plate 160, near the leading edge of the diaphragm, are secured hooks or buttons 191, with which the stub 192 of stencil sheet may be engaged by placing the holes 193 in the stencil stub over the buttons. Both the ink pad and the stencil sheet lie across the beveled seats 164.

The ink pad and the stencil sheet are firmly clamped against these seats by a metal frame having edges 1941 of complementary bevel to the seats 164: and arranged to align therewith. The frame comprises an outer plate 195, which rounds out the outer periphery o t the cylinder, and an inner plate 196, secured together, plate 196 having a perforation 19? to avoid interference from filler cap 178. Toward each side edge, plate 195 is formed with a depressed portion 198 and with a raised flange, which is curved at each end, as at 199, and has a straight portion 200 intermediate these curved portions. On the underside of each straight portion 200 is a metal clamp strip 201 which has a pin extend ing through a slot 203 in flange 200 and there is headed over. Toward its other end strip 201 carries a threaded pin f which penctrates a slot in flange 200 and is there ongaged by a linger nut 205, whereby the strip may be pivotally moved toward and from flange 200. A spring 206 compressed between flange 200 and strip 201 urges the strip to move away from flange 200. The flanges 152 and 153 of the cylinder fills each form curved portions 207 corresponding with flange portions 199, and with a straight portion 208 which. seats beneath that part of flange portion 200 which is not occupied by clamps 201, and with a lower straight portion 209 which rests on plate 160. The frame may be secured on the cylinder by looseningscrews 205 to lower strips 201 from flanges 200, and then after placing the frame upon the cylinder, sliding the clamps 201 beneath members 208. At the same time perforations 210 in flanges 200 are engaged over pins 211 on cylinder flange portions 208. Now, by tightening nuts 205 the clamps 201 will he brought firmly against portions 208 and the frame will be clamped tightly downwardly, thus clamping the beveled edges 191 tightly against the beveled edges 161 and clamping the ink pad and stencil sheet tightly therebetween. To remove this frame, it is only necessary to loosen nuts 205. slide them, with the attached strips 201, on flanges 200 to dis engage the strips from beneath portions 208, and then lift the frame upwardly. The removal leaves the stencil sheet and pad readily accessible for removal or replacement, as before described.

From the above it will be readily apparent that the frame plate construction 195 rounds out the cylindrical periphery of the cylinder between the side walls thereof and between the ends of the diaphragm 158. Thus. when the machine is of the type disclosed in my said copending application, wherein there is a rubber impression roller (shown at 10 in dot and dash lines in Fig. 1) which normal y till Ill?) contacts continuously with the cylinder as the cylinder revolves, the rubber roller will have a smooth, even surface to roll on, and the stencil sheet and ink pad attaching means, and the rubber roller will be shielded from contact with each other during the operation of the machine. It also will be noted that the frame is removable and attachable very readily, thus permitting easy access to the stencil sheet and inlc pad attaching means, and to the ink port to the ink reservoir. l-ly reason of the clamping action of the frame upon the int; pad and stencil sheet the opera tor in making a replacement or adjustment of a sheet or pad need not touch any surface which is soiled with ink, and need not soil his hands.

As many changes could be made in the above construction and as many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the aeeom iianying drawings shall be interpreted as illustrative and not .in a limiting sense.

1. In an apparatus of the character described, in combination, a printing cylinder including outside walls, interior walls, a diaphragm secured to said interior walls in a leak-proof manner, a plate secured to said interior walls and to the ends of said diaphragm in a leak-proof manner, and a supplementary frame covering said plate and removably secured to said outside walls.

2. In an apparatus of the character described, in combination, a printing cylinder including outside walls, interior walls, a diaphragm secured to said interior walls in a leak-proof manner, a plate secured to said interior walls and to the ends of said diaphragm in a leak-proof manner, and a supplementary frame covering said plate and removably secured to said outside walls, said plate bemg depressed below the circumference of the cylinder, and the outside of said frame being at the circumference of said cylinder.

3. In an apparatus of the character described, a printing cylinder including, in combination, Walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and removably secured to said walls, said walls having recesses and said f'ame having tongues slidable thereon into and out of engagement in said recesses, and means for securing said tongues tightly in said recesses to clamp said frame in place on the cylinder.

4. In an apparatus of the character described, a printing cylinder including, in combination, walls, a dialiihragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and re mov-ably secured to said walls, said walls having recesses and said frame having tongues slidable thereon into and out of engagement in said recesses, and means for securing said tongues tightly in said recesses to-clamp said frame in place on the cylinder, said frame and walls also having interengaging pins and apertures.

5. In an apparatus of the character described, a printing cylinder including, in combination, walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplen'ientary frame covering said plate and removably secured to said walls, said walls having recesses and said frame having tongues slidable thereon into and out of engagement in said recesses, threaded pins on said tongues extending through said frame, and nuts on said pins, whereby said tongues may be tightly clamped upwardly against the upper walls of said recesses.

6. I11 an apparatus of the character described, a printing cylinder including, in combination, walls, a diaphragnii secured to said walls, a plate secured. to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and removably secured to said walls, said walls having recesses and said frame having tongues slidable thereon into and out of en gagemcnt in said recesses, threaded pins on said tongues extending through said frame, and nuts on said pins, whereby said tongues may be tightly clamped upwardly against the upper walls of said recesses, said nuts also constituting handles whereby said plate may be lifted.

7. In an apparatus of the character de scribed, a printing cylinder including, in combination. walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a sup plementary frame covering said plate and removably secured to said walls, said diaphragm having beveled edges presented toward the edges of said frame, and said frame having edges of complementary bevel 1 seating on said beveled diaphragm edges.

8. In an apparatus of the character de scribed, a printing cylinder including, in

combination, walls, a diaphragm secured to said walls, a plate secured to said walls and.

to the ends of said diaphragm, and. a sup ple mentary frame covering said plate and removahly secured to said walls, said plate edges being flanged back whare the edges are secured to the diaphragm and forming a rearwardly open recess at each said edge.

9. In an apparatus of the character described, a printing cylinder including, in combination, walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and removably secured to said walls, said plate edgesbeing flanged back where the edges are secured to the diaphragm and forming a rearwardly open recess at each said edge, and an ink pad on the cylinder having an attachment plate engaged along one edge in one of said recesses.

10. In an apparatus of the character clescribed, a printing cylinder including, in combination, walls, adiaphragm secured to said Walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and removably secured to said walls, said plate edges being flanged back where the edges are secured to the diaphragm and forming a. rear- Wardly open recess at each said edge, and an ink pad on the cylinder having at each end an attachment plate engaged along one edge in one 0t said recesses.

11. In an apparatus of the character described, a printing cylinder including, in combina-tion, walls, a. diaphragm secured to said Walls, a plate secured to said ralls and to the ends of said diaphragm, and a supplementary frame covering-said plate and reinovably 5 cured to said walls, said plate edg s being flanged back where the ct ges the diaphragm and forming open recess at each said edge, an ink pad on the cylinder having an attachment plate engaged along one edge in one of said recesses, and means on said plate engaging said attachment plate at its other edge.

12. In an apparatus of the character de scribed, a printing cylinder including, in combination, Walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and reniovably secured to said walls, said plate edges being flanged back where the edges are secured to the diaphragm and forming rearwardly open recess at each said edge, an ink pad on the cylinder having at each end an attachment plate engaged along one edge in one of said recesses, and means on said plate engaging said attachment plates at their other edges.

13. in an apparatus of the character described, a printing cylinder including, in combination, walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and. removably secured to said walls, said plate edges being flanged back where the edges are secured to the diaphragm and forming a rearwardly open recess at each said edge, an ink pad on the cylinder having an attachment plate engaged along one edge in one of said recesses, and means on said plate engaging said attachment plate at its other edge, said means including a latch bar slidably mounted on said plate, and having a portion. engageable over the edge of said plate.

14. In an apparatus of the character described, a printing cylinder including, in combination, walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary frame covering said plate and re movably secured to said valls, said plate edges i sing flanged back where the edges are secured to the diaphragm and forming a rearwardly open recess at each said edge, an ink pad on the cylinder having at each end an attachment plate engaged along one edge in one of said recesses, and means on said plate engaging said attachment plates at their other edges, said ink pad being reversible, end for end on said cylinder, and said means being engageable with either attachment plate of said pad.

15. In an apparatus of the character described, a printing cylinder including, in combination, walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, and a supplementary fame covering said plate and removably secured to said walls, said diaphragm having beveled edges presented toward the edges of said frame, and said frame having of complementary bevel seating on said beveled diaphragm edges, an ink pad, and means on said plate for securing the ink pad to the cylinder with the fabric thereof disposed between said complementary beveled edges of the diaphragm and frame.

16. In an apparatus of the character described, a. printing cylinder including. in combination, walls, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, a supplemeir tary frame covering said plate and rcmovably secured to said walls, said diaphragm having beveled edges presented toward. the edges of said frame, said frame having edges of con'iplementary bevel seating on said hereled diaphragm edge, a stencil sheet, and means on said plate for securing the stencil sheet to the cylinder with the fabric of the stencil sheet disposed between said complementary beveled edges ot the diaphragm and frame.

17. In an apparatus of the cliarzu-lrr described, a printing cylinder including. in combination, ails, a diaphragm secured to said walls, a plate secured to said walls and to the ends of said diaphragm, a supplementary frame covering said plate and removably secured to said walls, said diaphragm having beveled edges presented toward the edges of said frame, said frame having edges of complementary bevel seating on said bev eled diaphragm edges, an ink pad, means on said plate for securing the ink pad to the ill) Ice

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cylinder with the fabric thereof disposed between said complementary beveled edges of the diaphragm and frame, and means tor forcing said complementary beveled edges tightly together to clamp said ink pad tiabrio tightly therebetween.

18. In an apparatus of the character described, a printing cylinder including, in combination, Walls, a diaphragn'i secured to said Walls, a plate secured to said Walls and t0 the ends of said diaphragm, a supplemeir tary frame covering said plate and remov ably secured to said Walls, said diaphragm having beveled edges presented toward the edges of said frame, said tralne having edges of contiplementary bevel seating on said beveled diaphragm edges, an ink pad, means on said plate for securing the inlrpad to the cylinder With the fabric thereoit disposed between said complementary beveled edges of the diaphragm and frame, and means for forcing said complementary beveled edges tightly together to clamp said stencil fabric tightly therebetween.

This specification signed this 28th day of October, 1.926.

ERNEST J. BRASEdE-UE.

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