US1791157A

US1791157A - Stencil duplicating machine

Info

Publication number: US1791157A
Application number: US263885A
Authority: US
Inventors: Brasseur Ernest Joseph
Original assignee: AB Dick Co
Current assignee: AB Dick Co
Priority date: 1928-03-22
Filing date: 1928-03-22
Publication date: 1931-02-03
Anticipated expiration: 1948-02-03

Description

Feb; 3, 1931. I j E. JBRASSEUR 1,791.157

STENCIL QUPI'JICATING MACHINE Fileld March 22, 1928 Patented Fens, "1193i 1 um'rsn STATESQPATENTIOFFICE T mama Joann: smssaun, or cm caeoyrnnmois, ASSIGNOB no a. n. max com PANY, F OHIGAGO, ILLINOIS, A CORPORATION OF ILLINOIS amen. nurmcarme mom Application fll'ed'ltarch 22, 1928. Serial 1T0. 268,885.

This invention relates to. stencil-duplicafl ing machines, and more particularly to means for registering the print on the work.

In an application for stenciLduplicating 5 machines filed by me October 8,1925, Serial N 0. 61,172, I have described. a stencilduplicating machine in which detent means associated with the printing cylinder, acts as a stop against which the cylinder may be 1 rotated in reverse direction, so that .the operator may place the cylinder in exactly the same relative position with respect to the leading edge of every sheet of work printed. The stop means referred to is not capable of adjustment, and therefore if the prlnting is placed a little too near or a little too far from the leading edge of the printed sheets, or not in correct registration withthe lines of lined sheets, or with spaces thereon, it is necessary to adjustthe stencil-sheetton the cylinder drum in order to bring the printing into the desired position on the printed sheets. Eifecting such registration by removing and adjusting the stencil-sheet is a difiicult and time-consuming operation, and

usually results in the operators hands becoming soiled with ink from the stencilsheet and ink-pad.

The principal ob'ect of the present invention is to. provi e detent means for the counter rotation of the cylinder which 'is adjustable with respect to the cylinder so that the operator may correct or adjust the registration of the print on the printed sheets by merely adjusting the detent means and without being required to make any adjustment of v the stencil-sheet on the impression-cylinder.

A further object of the invention is to provide print registration means of the character described which are simple in construction, positive andefiicient in operation, and readily andeasily adjustable.

@therobjects of the invention will be in inatter,

In order that a clearer understanding of my invention may he had, attention is d1- rected to the accompanying drawings, forminga part of this ap lication and illustrating the preferred embo iment of my Invent on,

part obvious and invpart pointed out here-,

and in which Fi 1 is aside view of a rotary duplicating mac ine, showing the improved print registration means, a portion of the frame of the maclune being broken away and certaln parts bemg shown in dotted lines;

Fig. 2 is a sectional view of the registration.

means and is taken on the line 22 of Fig. 1;

and Fig. 3"is a perspective view of thecam action adjustment lever.

For the purposes of illustrating the applicatlon of the invention to rotary du licating mach nes, I have shown "the reglstration *rheans applied to a rotary duplicating machine of the type disclosed in my said application. It is to be understood, however, that my invention may also be applied to rotary dupllcating machines of other constructions.

As shown in, the drawings, the duplicating mach ne comprises suitable frame-work 1, on whlch is Journaled an impression-cylinder 2, having a shaft 3 and a hand-lever 4, whereby the lmpression-cylinder may be rotated in either direction. v

Therubber impression-roller 5 is j ournaled on swinging arms 6, which'are engaged by a cam-shaft 7, to the end of which issecured a hand-lever 8, whereby the cam-shaft 7 may be rotated to place the swinging arms 6 and the impression-roller 5 in raised position, in which the impression-roller is in printing contact with the impression-cylinder 2, or in lowered position, in which the impressionroller 5 is out of contact with the cylinder 2. V

The shaft 3 ofthe impression-cylinder carries a collar 9, which has anotch 10, in which a spring-pressed pawl 11 is adapted to be received to stop rotation of the impression-cyl inder 2 in the direction reverse to printing rotation. A pin-and-slot engagement between pawl 11 and the links 12 and 13 causes the pawl 11 to be withdrawn from the notch 10 whenever the handle 8 is swung to off position, thus releasing the cylinder 2' for counter-rotation, and at the same time the impression-roller 5 is held out of contact therewith, so that it cannot become smeared with ink from the impression-cylinder. llhe pinand-slot connection between the link 12 and the pawl 11 permits the collar 9 to depress the pawl 11 as the cylinder is rotated in printing direction.

lln the machine shown in my said applies tion, the pawl is mounted on a tired pivot, and therefore the rotative position of the impression-cylinder when brought against the stop in counter-rotation cannot be varied.

in accordance with the present invention, the

pawl 11 is adjustable relatively to the collar 9 in such a way that the operator may set the pawl 11 to stop the counter rotation of the impression-roller in any one of a number of positions within certain limits.

To this end, the pawl 11. fs providedwith a circular aperture in which seats the hub 14 of a lever 15. Hub ll is provided with an eccentrically located hole 16 and is pivotally mounted thereby on a stud l7 fixed in the frame of the machine. A screw 18 holds the hub in position on the stud.

It will be understood that rotation of the cam hubl l, by swinging lever 15 one way or the other, will move the end oi the pawl ll means comprises a screw 19 passed through a till in a direction approximately tangential to the collar 9. .ll/leans are provided for looking the lever 15, and consequently the pawl 11, in adjusted position. As shown, such the upper end of lever 15. Screw 19 is provided with a thumb-nut 20, and has an en larged head 21, between which and the lever 15 is disposed at flange 22 formed on the upper edge of the enlarged tan-like tail 23 of the pawl 11.

A pin 24, carried on the pawl 11, engages in the slot 25 of the link-member l2. spring 26, coiled about this pin and having one end 27 engaging the frame 1 of the machine, resiliently presses the end of pawl 11 against the collar 9.

Preferably, the circular edge of the tail 23 of the pawl 11 is graduated and the lever 15 is provided with a pointer 28 to indicate approximately the adjusted position oi the pawl and consequently the approximate stopping position of the impression-cylinder.

In Fig. 1, there is shown in full lines the the relative positions of the parts when the lever 15 is in such position that the impression-cylinder 2, when rotated in a direction reverseto printing direction, is stopped in its most forward rotative position. in dot and dash lines, in Fig. l, are shown the relative positions of the parts when the lever 15 is in such position that the impression-cylinder on counter rotation is stopped in its extreme rearward rotative position. These two extreme positions of the impression-cylinder are indicated respectively on the drawing by the dash lines A. and B. By adjusting the lever 15 to the proper intermediate position, the counter rotation of the impression-cylinder 2 may be stopped by the pawl 11 in any desired position between these extremes.

its will be apparent from the above dememe? scription, it is a simple matter for the operator to make the adjustment which will position the print on the printed sheets in exactly the desired place thereon. lit the operator finds that the print is not incorrect registration on the printed sheet, either with respect to the leading edge of the sheet, or with respect to spaces on the sheet, or with respect tolines on sheets which are ruled or printed, he need only adjust the lever 15 so that when till he brings the shoulder of the notch 10 in the collar 9 against the pawl 11, the impression cylinder 2 will be in proper position to place the printing on the work in the proper place thereon.

that each sheet is properly inserted into engagement between the impression-cylinder and the rubber roller 5.

It will be readily apparent from the construction disclosed that proper registration of printing on sheets may be secured in a most simple and easy manner without requiring the stencil sheet to be adjusted on the impression-cylinder. I

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

' What if claim is:

l. in an apparatus of the character described, in combination, a rotatable cylinder and means forlimiting rotation of the cylinder in a certain direction, said means including an element rotatable with the cylinder, and a coacting stop pawl mounted on a shiftablepivot, and means, including a finger grip element, for adjusting the position of said shiftable pivot to vary the rotative stop position of the cylinder.

2. in an apparatus of the character described. in combination, a rotatable cylinder, means for limiting rotation of the cylinder in a certain direction, said means including an element rotatable with the cylinder, and a matching stop pawl mounted on a shiftable pivot, means, including a finger grip element, for adjusting the position of said shiftable pivot to vary the rotative stop position of the cylinder, and means controlled through said finger piece for locking said pivot in adjusted position.

3. In an apparatus of the character described, in com ination, a rotatable cylinder and means for limiting rotation of the cylin der in a certain direction, said means including an element rotatable with the cylinder, an eccentrically mounted member and a pawl pivotally carried on said eccentrically mounted member, and means, including aginger grip element, for adjustmg the posi ion of the eccentrically mounted member to vary the rotative stop position of the cylinder.

4 In an apparatus of the character described, in combination, aframe, a cylinder rotatable on the frame, a notched element rotatable with the cylinder, a hub mounted for eccentric rotation on said frame, a stop pawl pivotally mounted on said hub and coacting with said notched element, whereby rotation of said hub on the frame shifts said pawl bodily with respect to said notched element, and means, including an adjustable lever, whereby said hub may be rotated to vary the rotative position of the cylinder when the notched element is rotated into engagement with said pawl.

5. In an apparatus of the character described, in combination, a frame, a cylinder rotatable on the frame, a notched element rotatable with the cylinder, a hub mounted for eccentric rotation on said frame, a stop pawl pivotally mounted on said hub and coacting with said notched element, whereby rotation of said hub on the frame shifts said pawl bodily with respect to said notched element, means, including an adjustable lever, whereby said hub may be rotated to vary the rotative position of the cylinder when the notched element is rotated into engagement with said pawl, and means for locking said lever in adjusted position.

6. In an apparatus of the character described, in combination, a frame, a cylinder rotatable on the frame, a notched element rotatable with the cylinder, a hub mounted for eccentric rotation on said frame, a stop pawl pivotally mounted on said hub and coacting with said notched element whereby rotation of said hub on the frame shifts said pawl bodily with respect to said notched element, means, including an adjustable lever, whereby said hub may be rotated to vary the rotative position of the cylinder when the notched element is rotated into engagement with said pawl, said pawl having an enlarged tail portion, and means for locking said lever to said tail portion, whereby said lever is held in adjusted position.

7. In an apparatus of the character described, in combination, a frame, a cylinder rotatable on the frame, a notched element rotatable with the cylinder, a hub mounted for eccentric rotation on said frame, a stop pawl pivotally mounted on said hub and coacting wit-h said notched element, whereby rotation of said hub'on the frame shifts said ment, means includin in a pawl bodily with respect to said notched elewhereby said hub may rotated to vary the rotative position of the cylinder when'the notched e ement is rotated into engagement with said pawl, said pawl havin an enlarged tail portion, and means for locking said lever to said tail portion, whereby said lever is held in adjusted position, said tail portion being graduated and said lever having a coacting pointer for indicating the adjusted position of said sto pawl relatively to the notched element an cylinder.

8. In an apparatus of the character described, in combination, a frame, a rotatable cylinder, a cylinder shaft, a stop member carrled on said shaft for rotation therewith and having a stop portion, an eccentrically rotatable pivot mounted on the frame, a pawl rotatably mounted on said pivot and adapted to coact with said stop member to stop the cylinder upon rotation in a certain direction, predetermined position, and means for rotating the eccentrically rotatable pivot to adjust the pawl relatively with respect to the stop member to vary the predetermined an adjustable lever,