Patent GB-190504966-A (GB)
Title: Improvements in Stencil Printing Machines.
Inventor: GESTETNER DAVID
Filed: 1905-03-09
Granted: 1906-03-08
Abstract: 4966. Gestetner, D. March 9. Stencilling - apparatus.-Relates to machines for printing addresses or for other purposes, in which a number of frames carrying stencils and inking- pads are connected in the form of a chain which is given a step-bystep motion to bring each stencil successively into the printing position. Each stencil is carried by a frame a of cardboard or the like, having notches b in the ends, over which is stretched an ink-proofed sheet c. An ink-pad d secured to the sheet c has placed over it the stencil, which fits the frame a and is held in position by the pad d. The frames a may be fed singly from a magazine to the printing position, but are preferably connected into a chain by means of flexible bands f and passed over a roller g which consists of two pentagonal endplates fixed on a shaft m. Motion is given to the roller g by imparting a reciprocal semi-rotation to a handle i loose on a shaft h. An arm on the handle i is connected by a link q with a lever r carrying a pawl o which engages pins n on one of the end-plates of the roller. A recess t in a stop-lever s controlled by a spring u engages one of the pins n and holds the roller steady during printing. The ,handle i is hollow and contains a spring-pressed pawl kwhich engages with notches in the shaft h and imparts to it an intermittent rotation. An impression roller v, carried by a swinging frame w mounted loosely on the shaft m, reciprocates under the stencil frame a during printing. A pin on the frame w is engaged by a forked arm 6 which is loose on the shaft m and is connected by a link y with an eccentric on the shaft h. The roller v and frame w to are pressed by springs against a platen 7 carried by an arm 8, which is connected by a spring 13 to a lever 14, the lower end of which carries a roller which rests against a cam 10 on the shaft h. A spring 18 connects the arm 8 with a pin on the frame. The lever 14 carries a plate 19 having a cam-groove in which rests a pin projecting from a lever, which is connected by a link to a second lever. The free ends of these levers are formed to fit the notches b in the ends of the stencil frames a, whereby the frames are adjusted in position. The chain of frames a passes loosely over the roller g from a pile 25 to a pile 26. The roller g may be rotated by hand when required, by means of a handle on the shaft m, without affecting the other mechanism. Means are provided for printing once or twice from each stencil frame or continuously from the same stencil frame. For this purpose, a ratchetwheel 28, Fig. 13, is mounted on a shaft 29 and is rotated by a pawl 41 pivoted on the link q. The shaft 29 also carries a cam 30 having three recesses, and also a loosely-mounted arm 31 which can be held in one or other of three positions by means of a pin engaging recesses in a segment 37. On a stud 43 is pivoted an arm 44 which may engage a pin on the pawl o and thus cause it to miss the pins n on the roller g. A pin 47 on the arm 44 may be engaged by a cam-surface 40 on the arm 31. On the stud 43 is also mounted an arm 48 having a projection 50 extending over the arm 44. The arm 48 is frictionally held against the arm 44 and has a pin 51 which is pressed by a spring 49 against the cam 30. When the arm 31 is in the position shown in Fig. 13, the arm 44 is held clear of the pin on the pawl o, and the roller g is advanced after each impression. In the position shown in Fig. 16, the arm 44 is in the path of the pin, but is lifted out of its path at every alternate impression by the cam 30. In the third position of the arm 31, the part 38 projects over the pin 47 and prevents the rise of the arm 44, so that the roller g is not advanced. The envelopes &c. are fed against adjustable fences 52.