US1106440A - Sheet-attaching device for stencil-machines. - Google Patents

Description

E. A. COX.

SHEET ATTAUHING DEVICE I OR STENCIL MACHINES= APPLICATION FILED MAY 22, 1912.

Patented Aug. 11, 1914,

' UNITEDJSTATES FATE EDWIN A. cox, or DAYTON, OHIO, AssIenoR T0 ,TrrE. no'rosrEEn COMPANY, or: DAYTON, OHIO, aconromrzon or OHIO.

sm'r-Ar'racrtme DEVICE ron STENCIL-MACHINES.

Specification of Letters Patent. Application filed May 22, 1912; Serial No. 699,025.

Patented Aug. 11, 1914.

A. Cox, a Britain, re

vice for attaching 'an ink pad and stencil sheetto a stencil printing machine and particularly to the rotary cylinder ty e cominonly known as duplicating machines of the class set forth in my Patent No. 1,07 0,419 of August 19th, 1913, and in 'my'pending application, No. 537,440, filed Jany. 11th, 1910. In this. class of'machines, the ink pad and Waxed stencil sheet are wrapped around and upon a. perforated stencil supporting segment having the ends thereof provided with means for attaching the ends of the ink pad and stencil sheet. The ends of the ink pads, which are usually made of woven fabric such as cotton flannel or equivalent material capable of readily absorbing and distributing the ink, are preferably bound with thin sheet metal reinforcements having means for attachment to cooperative attaching devices on the ends of the stencil supporting segment so as to draw the pad smoothly across the surface of said. segment. In like manner, suitable means must be provided for attaching at least one end of the stencil sheet to the front end of the segment soas to hold it smoothly upon the surface of the pad during the operation of printing.

So far as I am aware in all the-methods of attachment of the pad and stencil sheet heretofore employed, considerable difliculty has been experienced not only in properly alining these elements upon t e segment so as to draw evenly and smoothly over the surface thereof but there has always been more or less trouble and delay caused by tearing out the ends of the stencil due partially to the strain thereon and partially to the fact that it is drawn over the metal binding on the pad.

The main object of my present invention is to obviate these difiiculties by providing the front ends of the stencil supporting segment with a detachableattaching plate havng a series ofparallel rows of forwardly inclined catches or fingers, those of one row being less in number than and arranged in staggered relation with those of the other row, the row having the lesser number of fingers being adapted to enter the correspondingly arranged apertures or slots in the binding strip on one end of the pad, while the fingers of both rows are adapted to enter correspondingly disposed apertures in the end of the waxed stencil sheet so as to distribute the strain upon said sheet more evenly along the end thereof.

Another object is to. depress the portion of the attaching plate to which the binding strip of the pad is attached slightly beneath the surface of the'remaining portion of the plate upon-which the end of the stencil rests so that when the stencil and pad are placed -in operative position, the stencil will be drawn smoothly over the surface of the binding strip of the pad. In other words I have sought to utilize a relatively small number of fingers for attachment to the binding strip of the pad and a relatively larger number of fingers for retaining the stencil sheet and at the same time to, avoid any sharp bends between the attaching end I of the stencil sheet and plate or pad.

Other objects and uses will be brought out in the following description.

In the drawingsFigure 1 is a perspec tive view of the attaching plate showing the inking pad and stencil sheet attached thereto. Fig- 2 is a perspective view of the same plate showing the adjacent: end of the inking pad attached thereto, thestencil sheet being removed. Fig. 8 is a perspective view' of the detached stencil attaching plate. Fig. 4 is a sectional view taken on line 4-4 Fig. 1. Fig. 5 is a perspective view of the attaching end of the'detached stencilsheet showing the perforations therein as corresponding in position to the-fingers on the" plate. Fig. 6 is a perspective view of one end of the inking pad showing more particularly the binding strips and perforations therein. v

The attaching means for the ink pad and stencil preferabl comprises a sheet metal plate -1- angu at in cross section forming lengthwise flanges -2. and -3 preferably disposed at an acute angle with each.

other as shown more clearly in Fig. 4-, the

, within the extended periphery of the segment to avoid contact with the impression roll as the segment is rotated in the operation of printing. Theflange 2 which, as previously stated, is somewhat wider than theflange 3 is stepped to form bearing surfaces 7- and 8-in different parallel planes, the bearing -7 which is adjacent the flange -3 being depressed beneath the bearing 8 and 1s provided with a series of, in this instance three, upwardly and forwardly projecting fingers or prongs 9 spaced uniform distances apart and adapted to enter correspondingly disposed slots or apertures --10 in a sheet metal binding strip 11- with which the ends of the inking pad as -12- are provided, thus permitting either end of the pad to be attached to the prongs -9-. In like manner the raised bearing -8 is provided with a series of, in this instance six, upwardly and forwardly inclined prongs or fingers --13. spaced uniform distances apart for entering similarly disposed apertures 14 in one end of a'stencll sheet as 15-, said stencil sheet being provided with an additional series or row of, in this instance three, apertures 16- disposed to correspond with and for'receiving the prongs or fingers -9-.

It is apparent from the foregoing description-that the plate --1 is provided with two parallel rows of prongs or fingers, those on the lower bearing 7 being less in number and staggered with those of the other row on the bearing 8. The stencil sheet 15- is also provided near one end with parallel rows of apertures 14: and'16 corresponding in position to the ositions of the prongs 13- and -9.'

he binding strip -11 of the inking pad, however, is only provided With a single row of three apertures -10- disposed to receive only the prongs 9-.

The bearing 7-- is disposed beneath the bearing -.8- a distance corresponding approximately to the thickness of the binding strip 11- so that when the latter is placed upon the bearing -7 in o erative connection with the prongs -9,1ts outer surface will be substantially co-incident with the corresponding surface of the bearing 8. It therefore follows that when the stencil sheet is placed in operative connection, with the plate -1- with the prongs -9 and 13- projecting respectively through the apertures 16- and 14, said stencil sheet will not only lie smoothly across the binding stri and upon the pad but will also be attac ed at a relatively large number of points throughout its width and at different distances from its end edge so as to properly aline the stencil on the segment and also reduce the liability of tearing out while smoothing it out upon the pad. The prongs 9- and 13 are struck up and entirely detached at their front ends from the flange 2 of the plate -,-1 leaving their rear ends united integrally to said flange so that the prongs are disposed at an angle to the planes of the bearings 7 and 8- with their free ends projecting forwardly in the direction of rotation of the stencil supporting drum, thereby facilitating the retention of the pad and stencil sheet in engagement with the prongs during the printing operation and at the same time permitting said pad and stencil sheet. to be easily and quickly attached to or detached from the plate. When the plate -1:- is secured in the manner described to the end of thestencil supporting segment or drum it becomes practically a part of said drum or an extension of one endthereof deflected inwardly within its periphery.

What I claim is-:

1. In a stencil printing machine, in combination with a stencil supporting segment, a an angle plate havin one of its flanges secured to one ,end 0 the segment and its (other flange provided with forwardly projecting prongs, an ink pad detachably engaged with some of'the prongs, and a stencil sheet having apertures positioned to correspond with the position of all the prongs and attached tofall of saidprongs.

2. In a'stencil printing machine, the combination, with a stencil supporting segment, a of a plate attached to the segment and having a portion arranged within the circumference of a circle described on the. radius of said segment, said portion of said plate havin outwardly prqecting prongs, an ink pad swing a portion providedwith apertures to receive said prongsto attach lthe pad to the plate, said plate having a second series of prongs arranged in advance 2 of the first series, and a stencil sheet adapted 'gto extend across the apertured portion of 4 said ink pad andhaving apertures to receive the prongs of said second series.

3. In a stencil printing machine,rthe combination, with a stencil supporting segment, of a plate attached to and extending in front of said segment, said plate having two series of outwardly projecting prongs, an ink pad and a stencil sheet mounted in superposed relation on said segment, said ink pad having apertures to receive the prongs of' one series and said stencilsheet having apertures to receive the prongs of the other series.

4. An attaching 'plate for ink pads and stencil sheets of a stencil printing machine, said plate having stepped bearings, and separate rows of prongs inclining from their respective bearings in. the direction of movement of the plate,

5. In a stencilprinting machine, a stencil supporting segment having an extension at one end thereof, said extension being provided with a bearing surface and with prongs projecting outwardly between the front and rear edges of said bearing surface and inclined in the direction of rotation, and a flexible sheet supported by said segment and having a part engaging said hearing surface and provided with apertures through which said prongs project.

6. In a stencil printing machine, a stencil supporting drum segment having an in wardly deflected extension at one end provided. with; separate rows of prongs struck up outwardly in -planes one in advance of the other,a pad'having one end provided 1 with apertures receiving the prongs of one row, and a stencil sheet having one end pro- .videdwvith separate sets of apertures receiving both rows of prongs.

7. In a stencil printing machine, the combination, with a stencil supporting segment having a flange at the forward end thereof, of an attaching plate connected to said flange and provided with a bearing surface disposed within the circular path of said segment, and means to secure the end of a stencil sheet to said plate.

8. In a stencil printing machine, the com-* bination, with a stencil-supporting segment Y having a flange extending inwardly from one end thereof, of a stenc l attaching plate connected to said flange and disposed wholly within the circle described by 'said segment.

9. In a stencil printing machine, the combination, with a stencil-supporting segment having a flange extending inwardly from one endthereof,-of a plate bent to form longitudinal flanges, one of said flanges being arranged in engagement with and attached to the flange of the segment and the other flange of said plate projecting forward from said segment and having stencil attaching means.

10. In a stencil printing machine, the combination with a stencil supporting segment, of a flange extending inwardly from one end thereof, and a plate bent to form longitudinal flanges arranged at an angle to each other, one of said flanges of the plate being attached to theflange' of the segment, and the other flange of said plate being formed with stencil-sheet attaching means.

11. In a stencil printing machine, the combination with a stencil supporting segment, of a flange extending inwardl from one end thereof, and a plate connecte to said flange and formed with separate rows of prongs, one of said rows of prongs being adapted for engagement with an ink pad, and both of said rows of prongs being adapted for en'- gagement with a stencil sheet.

12. An attaching plate for ink pads and stencil sheets of a stencil printing machine, said plate bein bent longitudinally to form flanges, one 0% said flanges being formed with separate means for attaching both an ink pad and a stencil sheet thereto.

In witness whereof I have hereunto set my hand this 14th day of May 1912.

EDWIN A. COX.

Witnesses":

GEORGE B. LEWIS, Amos L. KEEMER.

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