US746931A - Stencil-printing machine. - Google Patents

Description

No. 746,931. PATENTED DEC, 15, 1903.

A. B. DICK; STENCIL PRINTING MACHINE.

APPLICATION FILED SEPT. 19. 1903.

2 sEEETs sHsBT 1.

N0 MODEL.

ATTORNEY 1 mums warms c3 PHTIO-L PATENTED DEC. .15, 1903.

A. B. DICK. STENCIL PRINTING MACHINE.

APPLIUATION FILED SEPT. 19. 1903.

H0 MODEL.

Hill! HHH v ATTORNEY UNITED STATES Patented December 15, 1903.

PATENT OFFICE.

ALBERT B. Dion, OF cnioneo, ILLINOIS, ASSIGNOR TO A. B. DICK COMPANY,

or CHICAGO, ILLINOIS, conronnrron or ILLINOIS.

STENCIL-PRINTING MACHINE.

SPECIFICATION forming part of Letters Patent 0. 746,931, dated December 15, 1903.

' Application filed'Septeznber 19, 1903. Serial No. 173,830. (No model.)

To all whom it may concern:

Be it known that I, ALBERT B. DICK, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Stencil-Printing Machines, of which the following is a description.

The object of the present invention is to provide a stencil-printing machine which shall be simple in construction, and therefore of low cost of manufacture.

A further object is to so construct and arrange the operative parts as to insure reliability and positive coaction of those movable elements of the construction which are recurringly brought into operation in the production of prints from such machine.

In carrying out the invention I employ a suitable frame upon which is mounted a drum, on the surface whereof the stencil sheet may be secured in any suitable manner. Also mounted in the frame and below the drum I employ an impression-roller, preferably adjustable into and out of operative relation to said drum.' 7 Theimpression-paper is designed to pass between said roller and said drum in order'to receive the prints from the stencil carried on the latter. Adjacent to the coacting portions of the impressionroller and the drum I employa hinged or pivoted paper-stripperprovided with projecting paper-stripping arms, the ends whereof catch the paper as the drum revolves, stripping it from the surface of the stencil-sheet, to which it would otherwise adhere owing to the ink upon the latter.

proper position of the impression-paper fed into the machine during the inoperative in-' tervals of the stencil-sheet, a paper-stop is employed, which in one position interposes' In order to determine the v The paother is brought to inoperative position: They are therefore mechanically so connected as to be interdependent, thus making it impossible for either to operate without effecting the operation of the other.

'The invention is illustrated in the accompanying. drawings, in which- Figure 1 is a side elevation of a stencilprinting machine embodying my invention.

B designates upwardly-projectingbrackets,

in the upper ends whereof is mounted the drum 0, carrying upon its periphery the perforate screen and stencil-sheet common in apparatus of this type. Movement is transmitted to the drum 0 in the present instance by means of a gear 0, meshing with a gear 0, driven by a crank 0 V I Pivotally mounted upon the crossrod 61. within the frame are arms D, in which is pivotally mounted the impression-roller E. The

ends of the pivoted arms D are downwardly and rearwardly curved for coaction with cams d, operated by a finger-piece d, to throw the impression-roller into and out of operative relation to the drum 0. A spring d tends to The paper-stripper comprises in the prescut instance a bar F, carrying rearwardlyprojecting paper-stripping fingers f, the ends whereof (here shown as provided with starwheelsf) terminate in proximity to the point of coaction of the stencil-sheet on the drum D and the impression-paper fed into the machine over the feed-board A. The bar F is pivoted at its ends in the side members a a, of the machine. Coacting with said bar is a rocking lever G, pivoted at g to the side mem- :00

her a of the frame. One end of said rocking lever G underlies said bar F, while the which. simi- 65 other end is provided with a sheave g, lying in the path of movement of a cam 9 carried by the adjacent head of the drum 0. When during the operation of said drum 0 said cam is brought into coaction with the'sheave g, the distant end of the rocking lever G is elevated to throw'the paper-stripping fingersf upward and out of operative position.

Projecting downwardly and rearwardly from the bar F are two arms H, in the free ends whereof is mounted a rock shaft h, provided with a paper-stop, here shown as comprising fingers h. Secured tothe rockshaft 71. is a cam h the lower curved end whereof coacts with a pin h here shown as carried by one of the hinged arms D, in which the impression-roller E is mounted. A spring 71, tends to hold this cam 72. in operative positiont'. e., the position in which it is shown in Fig. 1. The movement of said cam to throw the paper-stop h to inoperative position is therefore against the tension of said spring.

I designates a spring connected at one end with the side member a of the frame A and at its other end to one of the arms H, in which the rock-shaft h is supported.

In the position in which the parts are illustrated in Fig. 1 the stencil-sheet is out of operative position and the machine is ready to receive a sheet of impression-paper. This is fed over the board A until the forward edge thereof is brought into contact with the paper-stop h. The paper-stripping fingers f are elevated to inoperative position, due to the coaction of the cam g on the drum Oand the sheave g on the rock-bar G. The drum now being turned, the cam g passes beyond the sheave g, thereby permitting said sheave to rise and the rear end of the rock-bar G'to drop, whereupon the paper-stripping fingers f are correspondingly depressed into position to lie directly over the forward edge of the impression-paper, so as to part the same from the stencil-sheet on the drum 0. Simultaneously with the dropping of the paperstripping fingersf the arms II and the paperstop carried thereby are also depressed, this movement being assured not only by the release of the rock-bar G, but also by the stress of the spring I. In this downward movement of the arms H the coaction of the cam k with the pin it on the pivoted arm D turns such cam, and consequently the rock-shaft h, to which it is secured, thereby throwing the paper-stop fingers h from the operative position, in which they are illustrated in Fig. 1, to inoperative position, where they are removed from the line of travel of the impressionpaper fed through the machine.

As will be seen, the movements of the paperstop and of the paper-stripper are interdependent. When one is in operative position, the other is necessarily in inoperative position, this being required by the office which each performs in the stencil-printing operation.

It is obvious that many modifications may be made in the specific embodiment of the invention herein shown and described without departing from the spirit of theinvention. For example, the paper-stopping device instead of taking the form of the separated arms h may take the form of a bar extending continuously across the line of travel of the sheet. This will be so readily understood that the suggested change is notillustrated in the drawings.

Having now described myinventiou, what I claim as new therein, and desire to secure by Letters Patent, is as follows:

1. In a stencil-printing machine, the combination with aframe and a drum supported thereby and carrying a stencil-sheet, of a paper-stop and paper-stripper in operative relation tosaid drum, a connection between said paper-stop and paper-stripper and means for operating them sim ultaneously,'snbstantially as set forth.

2. In a stencil-printing machine, the combination with a frame and a drum supported thereby and carrying a stencil-sheet, of a paper-stop and paper-stripper in operative relation to said drum, means carried by said drum for operating the same, and mechanism intermediate of said paper-stop and paperstripper and coacting with said means for securing simultaneous operation of said paperstop and paper-stripper, substantially as set forth.

3. In a stencil-printing machine, the combination with a frame and adrum supported thereby and carrying a stencil-sheet, of a rock-shaft and actuating mechanism therefor, a paper-stop mounted upon said rockshaft and means carried by the drum for operating said actuating mechanism to throw said paper-stop into and out of operative position, substantially as set forth.

4 In a stencil-printing machine, the combination with a frame and a drum supported thereby and carrying a stencil-sheet, of a paper-stop mounted upon a rock-shaft, acam coacting with said stop and shaft, and means actuated by said drum and cooperating with said cam to move said paper-stop to operative and inoperative positions, substantially as set forth.

5. In a stencil-printing machine, the combination with a frame and a drum supported thereby and carrying a stencihsheet, of a rock-shaft, means for varying the relation thereof to said drum, a paper-stop mounted upon said rock-shaft, and mechanism, controlled by said drum, for throwing said paperstop to operative or inoperative position sim ultaneously with changes in the relation of said rock-shaft to said drum, substantially as set forth.

6. In a stencil-printing machine, the combination with a frame and a drum supported thereby and carrying a stencil-sheet, of a paper-stop mounted upon a rock-shaft and coacting with a pin in fixed position relatively thereto, said cam and pin being brought into operative relation by the movement of said drum to throw said paper-stop to operative or inoperative position, substantially as set forth.

7. In a stencil-printing machine, the combination with a frame and a drum supported sition when said paper-stripper is thrown to operative position, substantially as set forth.

9. In a stencil-printing machine, the combination with a frame and a drum supported thereby and carrying a stencil-sheet, of a paper-stripper movably mounted in said frame, a paper-stop carried by a rock shat't sn pported in arms depending from said paperstripper, a cam for operating said paperstop, and means carried by said drum for operating said paper-stripper and said paperstop, substantially as set forth.

This specification signed and witnessed this 11th day of September, 1903.

ALBERT B. DICK.

Witnesses: V

M. H. BURKART,

R. R. HARRINGTON.

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