Patent GB-400208-A (GB)
Title: Improvements in mechanism for controlling the numbers in rotary numbering boxes for printing machines
IPC: B41K3/12
Filed: 1932-04-18
Abstract: 400,208. Number-printing apparatus. MARTIN, F. R., 18, Laystall Street, London. April 18, 1932, No. 11060. [Class 100 (ii).] In a rotary printing-machine having one or more rotary numbering - boxes of known type furnished with tripping - levers, means operatively connected with the driving-gear of the machine is provided to control the changing of the numbers in each numbering-box to any desired order of arithmetical progression. A stationary camplate carrier a, secured to a support a<1>, is arranged coaxial with the cylinders d to which the numbering-boxes e are attached. Cam-plates g are adapted to slide in radial grooves in the carrier a, and are provided with removable screws m at their inner extremities, cam grooves h, and curved grooves i. The carrier a is formed with a concentric groove j in which ride the ends of tripping-levers l. The cam-plates g are adapted to be moved radially by means of two integral cams n, p mounted on the shaft r of the cylinders d, the camp being shaped to engage over the screws m to draw the plates g inwardly, and the cam n being adapted to engage the lower surfaces of the plates g to push them back to their initial positions : in both the inner and outer positions the cam grooves h, i form continuations of the groove j in the carrier a, so that the tripping- levers l will ride in the grooves but will only be actuated when the cam-plates g are in their inner positions. The cam-plates g are provided with spring-pressed balls which enter recesses in the carrier a in the two extreme positions. The integral cams n, p are attached to one end of a key s mounted to slide in a key-way in the shaft r, and the other end of the key is secured to a collar s<1> on the shaft r. The collar s<1> is made to slide along the shaft r to bring either of the cams n, p into a position where they can engage the cam-plates g, by means of a rocking lever t which is spring- pressed into engagement with a cam v. The cam v is detachably secured to a pin-wheel w<1> adapted to be rotated by a wheel w having a single tooth and mounted on the main shaft x which carries the impression roller z of the machine. The cam v is thus moved to the extent of one tooth during each revolution of the shaft x, and a spring-pressed catch-lever is arranged to engage the teeth of the wheel w<1> to lock the cam v after each movement. The number of cam-plates g in operation can be varied by removing the screws m. In the case where several sheets bearing the same numbers are required to be printed, the collar s may be slid inwardly and temporarily secured to the shaft r by passing a pin through the collar into the shaft ; in this case the cam p is rendered inoperative. When it is desired to change the numbers at each revolution of the numbering. cylinder d, the cam v may be removed, thus allowing the lever t to swing inwardly under the action of its spring and to slide the collar s<1> outwardly ; this brings the cam p into operation, and the cam-plates g are kept in their inward positions with their cam grooves h operating on the tripping-levers l. The levers l are mounted on rocking shafts mounted in bearing brackets l<4> secured to the cylinders d, and operate on the usual tripping-levers l<5> on the boxes e ; if desired, the levers l<5> could be operated directly from the cam-grooves. The numbering-cylinders d are driven from the impression roller z by gears y<1>, y<2>.