US1906374A

US1906374A - Duplicating with the aid of stencils

Info

Publication number: US1906374A
Application number: US526462A
Authority: US
Inventors: Gestetner Sigmund
Original assignee: AB Dick Co
Current assignee: AB Dick Co
Priority date: 1931-03-30
Filing date: 1931-03-30
Publication date: 1933-05-02
Anticipated expiration: 1950-05-02

Description

M y 33- I s. GESTETNER 1,906,374

DUPLICATING WITH THE AID OF STBNCiLS Filed Marc'nzo, 1931 2 Sheets-Sheet 1 y 1 s. GESTETNER Y 1,906,374

DUPLICATING WITH THE AID 0F STENCJZLS v 2 Sheets-Sheet 2 Filed March 30. .1931

Patented May 2, 1933 UNITED STATES PATENT OFFICE SIGEUID GES'IETNES, OF TOTTENHAM HALE, LONDON, ENGLAND, ASSIG-NOR, BY

IESNE ASSIGNMENTS, TO A. B. DICK COMPANY, OF CHICAGO, ILLINOIS, A CORPO- BATION OF ILLINOIS DUPLIOATING WITH THE AID OF STENCILS Application filed March 30, 1931. Serial No. 526,462.

This invention relates to rotary stencil duplicating machines of the kind with WhlOh a relatively viscous or pasty ink is employed and in which the ink is distributed over the surfaces of a plurality of nonorous 1nk1ng cylinders by which it is force through the openings in the stencili the latter being nor- Y mally mounted on a exible stencil carrier secured to endless bands in driving engagement with the cylinders by the rotation of which the stencil is caused to travel over the surface of the inking cylinders, the impression-receiving material being fed between one of these cylinders and a pressure roller.

Hitherto, with such machines, one end of the stencil,commonly described as the stencil heading, is engaged by fastenin means provided 'on a member extending etween the flexible bands in contact with a silk sheet, oneend of which is also engaged with the membenin question, the other end of the silk sheet being connected with a substantially rigid element extending from one band to the other band and being connected, in turn, with a member also extending across the machine and spaced apart from the first-mentioned member in order to permit inkto be applied to the surface of the cylinders, the second mentioned member being connected by a piece of flexible ink-impermeable materlal with the member on which the fastenin means for the stencil is provided.

ith this arrangement, hitherto it has been possible, in the event of the ink being or becoming relatively fluid, particularly with high speeds of operation of the machine,

for ink to be thrown off the cylinders.

The object of the present invention is to provide means for preventing such a possibility.

' Accordin to the invention, with the sub-.

stantially rigid element connected with the end of the silk sheet remote from the stencil fastening means is hingedly connected a hinged flap adapted to extend from the member in question and to bridge over the openg enabling ink to be supplied to the inkin cylinders.

lreferably, in accordance with the invention with the flap is associated springs adapted to constrain the flap to move into the position in which it bridges or covers the opening and the springs in question are, preferably, so arranged that on moving the flap about its hinged connection, in order to permit ink to be delivered on to the cylinders, it will be moved over its dead centre and retained in the open position by the sprin Thus, in accordance with the invention, projections may be provided on the flap, each of such projections engaging one end of a spring, the opposite end of which is connected with the rigidv member extending across the machine and forming an abutment for the free edge of the flap.

The connection between the ends of the flaps remote from their connection with the flap may each comprise a stirrup element adapted to engage a projection on one end of the rigid member in question, the projection bein constituted by the end of a bolt whereby t e said element is secured in know manner to the flexible bands.

One construction in accordance with the invention will be illustrated by way of ex- .with the invention;

Figure 2 is a view in perspective illustrating the application of the device to the inking cylinders of such a machine;

Figure 3 is a front view in elevation of the machine with the device in the position adapted to permit ink to be applied to the upper inking cylinder;

' Figure 4 is a view of the device associated with a silk sheet, and

Figure 5 is an end elevation on an enlarged scale of the flap and its associated parts.

The duplicating machine illustrated is generally of the character described in the United States specification No. 700,031 and in Figures 1, 2 and 3 of the drawings, 1 and 1a represent, respectively, the upper and lower inking cylinders. These cylinders are provided with spindles 2 and 2a which, as

shown in Figures 1 and 2, are en aged in bearings in the side members 3 whic are secured to a base plate 4 and form therewith the main frame of the machine.

By means of the handle 5.0n the spindle 6 on which is mounted the pinion 7, meshing with the spur wheel 8 mounted upon the spindle 2a of the inking cylinder 1a, the said inking cylinder may be rotated and consequence of the engagement of the Plus 9 in holes provided in the flexible members 10, corresponding motion is imparted to the inking cyllnder 1.

With the inking cylinders are aranged to cooperate, in the normal operation of the machine, a pair of waver rollers 11, the spindles 12 of which are engaged in slots 13 in the blocks'14 which are slidably mounted in slots in the ends of the pivoted lever 15 the books being connected together by a spring 16 adapted to force the waver rollers into contact with the inking cylinder.

This lever is mounted upon a pivot 15a and in an arm of this lever there is engaged one arm of the lever 17 which is adapted to be oscillated about the spindle 2a and by its oscillation it imparts to the lever 15 corresponding motion whereby the waver rollers are moved axially in order to assist in the distribution of the ink on the surface of the cylinders 1 and 1a. The other arm of the lever 17 is provided with a roller 18- mounted on a pin 19 and engaging the slot 20 in the link 21 which engages an eccentric 22 on the spur wheel 23 and is connected at the other end with a pin joint 24 with the lever 25 pivotally mounted on the pin 26 and oscillated about the said pin by the motion of the eccentric about the axis of rotation of the wheel 23 when the latter is rotated by rotation of the spur wheel 8.

The lever 25 is pivotally connected by the in 27 with the wedge shaped member 28 and y the oscillation of the lever 25 the wedgeshaped member is reciprocated. This motion of the wedge-shaped member between the roller 29 mounted upon the pin 30'and the roller 31 on the link 32 which is provided with slots 33 and 34 engaging, respectively, the spindle 35 on which the wheel 23 is mounted and the pin 30, causes the link to lift from the position shown in Figure 1 and in lifting it carries with it a plate 36 secured by the pin 37 to the link 32 thereby causing the hooked shaped portion 38 of the plate to engage the pin 39 on the arm 40 which is connected to a similar arm on the o posite side of the machine by the bar 41 pivotally mounted in the side members of the frame of the machine and thus to move the arm in an upward direction about the axis' of the bar thereby raising the collars 42 with which they are pivotally connected by screws 43.

These collars are slidably mounted upon the rods 44 forming an extension of the side members 45 of the carriage in which the pressure roller 46 is mounted and between the collars and the upper portion of the side members of the carriage, which are ivotal- 1y connected by the pins 47 with t e arms 48 pivotally mounted on the pins 49 on the side frame of the machine, there are arranged springs 50 so that in the raising of the collars the pressure roller will be caused to be resiliently pressed, in the normal operation of the machine, on the sheet of paper or other impression-receivin material to be operated upon by the stencl The member 51 extends between theflexible bands and is provided with fastening means 52 adapted to engage a stencil head ing, the body of the stencil being arranged in contact with a silk sheet 53 one end of which is also en aged with the member 54 the other end 0 the silk sheet being connected with a substantially rigid element 55 extending from the band on one side of the machine to a similar band on the other I side. To this rigid element which is not directly connected with these bands is connected a flap 56 by a hinge pin 57 engaging in a turned over edge 58 of the flap 56 and in lugs 59 on the rigid element.

On the flap 56 there are provided two rojections 60 and 6011 with the former of w ich one end of a spring 61 and with the other, one end of a sprin 61a is connected, the other ends of the spring being provided with a

stirrup element

62, 62a which are engaged (see particularly Figures 2 and 3) with the

projections

63, 63a on the opposite ends of a vided with the fastening means for the stencil heading.

In the normal operation of the machine, the flap 56 will be in the position shown in Figure 2 and the flange 66 thereon will cooperate with the adjacent edge of the rigid member 64. When occasion arises to re-mk the machine the flap may be moved about its hinge into the position shown in Figures 1 and 3 thus exposing a portion of the up er inking cylinder 1a to the surface of which ink is applied. Thereafter the flap is moved into the position shown in Figure 2, being retained in this position by the tension of the springs and remaining in this position during the operation of forming stencil impressions, the springs also operating to draw the substantially rigid element 55 connected with one end of the silk sheet 53, forward or towards the member 64 thus maintaining the silk sheet taut.

What I claim is 1. A stencil carrier for rotary duplicating machines of the kind with which a relasecured, a rigid member connected to one end of said sheet and a hinged flap connected with the rigid member and springs associated with the flap.

2. A stencil carrier for rotary duplicating machines of the kind with which a relatively viscous or pasty ink is employed comprising a sheet of flexible foraminous material in contact with which the stencil is secured, a rigid member connected to one end of said sheet and a hinged flap connected with the rigid member, a lug on one side of the rigid member, a lug on the opposite side thereof, one end of a spring connected with one lug, a stirrup on the opposite end of said spring, one end of a spring connected with the second lug and a stirrup on the other end of said spring.

3. A stencil carrier for rotary duplicating machines having a flexible foraminous stencil carrier, a rigid member connected to each end of said stencil carrier, a hinged flap mounted to close the space between the ends of said stencil carrier and springs associated with the flap to maintain said flap closed and said carrier taut.

4. The combination with a rotary stencil duplicating machine having inkingcylinders, and a flexible stencil carrier mounted to travel around said cylinders andhavinga rigid member connected to each end thereof, of means for closing the space between the ends of said carrier com rising a flap hinged at one edge to one of said rigid members and adapted to bear at its opposite edge on the other rigid member and spring means connected between the flap and one of said rigid members adapted to yieldingly retain said flap in closed position.

5. The combination with a rotary stencil duplicating machine having inking cylinders, and a flexible stencil carrier mounted to travel around said cylinders and having a rigid member connected to each end thereof, of means for closing the space between the ends of said carrier comprising a flap hinged at one edge to one of said rigid members and adapted to bear at its opposite edge on the other rigid member, lugs on opposite sides of said flap, and springs arranged between said lugs and the second mentioned rigid member to maintain the stencil carrier taut and the flap closed.

(5. The combination with a rotary stencil duplicating machine having inking cylin- (lcrs, and a flexible stencil carrier mounted to travel around said cylinders and having a rigid member connected to each end thereof, of means for closing the space between the ends of said carrier comprisin a fla hinged at one edge to one of said rigi mem ers and adapted to hear at its 0 posite edge on the other rigid member, and springs connected between the edges of the fla and the second mentioned rigid member an adapted to pass IGMUND GESTETN'ER.