Patent GB-790362-A (GB)
Title: Improvements in sheet feeding mechanism
IPC: B65H5/10
Filed: 1954-06-11
Abstract: 790,362. Feeding sheets. ROWLANDS, T., OSBORN, H., HUBBARD, H. J., and MOLINS MACHINE CO., Ltd. June 3, 1955 [June 11, 1954]. No. 17190/54. Class 100(1) In a cutting, embossing, printing &c. machine of the kind described in Specification 721,875, wherein a segment 41, Fig. 12, of a drum rolls beneath a forme 14 carried by a crosshead 19 and the arcuate face of the segment presses a sheet of material against the forme and effects the cutting &c. on the sheet, and the sheets are fed to the machine by a reciprocating grill or table 13, the grill is provided with grippers 1, 2 which grip a sheet by its front edge and drag it, as the grills moves, to register the sheet against stops 20, Fig. 4, in position for the cutting &c. operations. There are several grippers 1, 2 each comprising an upper movable hooked jaw 1 and two outer lower fixed jaws 2, the jaw 1being pivoted at 11 to the grill 13 and opened periodically, against the action of a spring, by lever means 6; 8 rocked by a cam 5 driven from the main shaft 42 of the machine. A sheet, which is fed and side-registered by known mechanism is gripped by the grippers 1, 2 and fed by the reciprocating grill 13 beneath the forme 14 to a position where the sheet abuts stops 20, whereupon the grippers slide off the sheet as they move further to the left. In this position, the sheet is received between further (open) gripper jaws 15, 16. The moving grippers 1, 2 each strike a detector 21 which triggers-off the top jaw 16 so that it closes on the sheet. Each jaw 16 is fixed to a spindle 22 to which is attached a lever 30, urged by a strong spring 29, having a pin thereon in engagement with a trigger 24 movable with the detector 21. The detectors 21 and stops 20 have pivotal spring-controlled mountings so that these parts can rise as the segment 41 rolls into its end position to press the sheet against the forme 14. Each whole gripper assembly is carried on a spring- pressed slider 26 mounted in guides in a bracket 17 mounted on a cross tube 18 carried by the crosshead 19. The tube 18 is releasably connected to a lever bracket 37 and adapted to be rocked through connections 36, 35, 34 when a projection on the segment 41 raises a lever 32. The tube is rocked when the segment reaches the feed-end position and causes the jaws 15, 16 to drop the sheet on to delivery tapes for removal. When the tube 18 is released from the bracket 37, the tube 18 carrying all the stop and gripper assemblies can be swung away to permit access to the underside of the crosshead 19. In operation, the gripper assemblies carrying the sheet are raised, against the action of the spring-urged sliders 26, by the rolling segment 41 pressing on each jaw 15, and when they are allowed to drop, each trigger 24 is operated to cause each jaw 16 to move and open the gripper, but the sheet still rests on the lower jaw 15. The tube 18 is then rocked to cause the sheet to drop on to the delivery tapes. As shown, the segment 41 is rolled to and fro along a surface 43 by a connecting rod 44 driven by a crank disc 43. The grill 13 is reciprocated by a link 46 and a triangular lever 47 connected at 48 to the segment 41, and the mechanism is substantially as described in Specification 790,361.