GB1191120A - Improvements in or relating to Feeding Tables for Printing Machines - Google Patents

Abstract

1,191,120. Feeding sheets; pile tables. ADAMOVSKE STROJIRNY NARODNI PODNIK. 28 June, 1967 [4 July, 1966], No. 29837/67. Heading BSR. A sheet-feeding device for an offset printing machine including exchangeable feed tables comprises two guide members 4, Fig. 2, each vertically movable on an inner guide bar 5 and having means supporting a feed table 7 with an eccentric pin 3 manually adjustable to maintain the table horizontal, and carriers 2 mounted on chains 1 entrained around chain wheels 6 and guided by outer guide bars 18 fixed to the inner guide bars 5, so that during rotation of the chains the carriers 2 engage the eccentric pins 3 and carry the guide members 4 and hence the feed table 7 with them. In use, a feed table 7 with a complete stack of sheets is manually placed on the angle-irons 8 constituting the support means, and the drive to the chains 1 is started. The feed-table is raised continuously by engagement of carriers 2 with pins 3 (Fig. 1, not shown) while sheets are removed from the top of the stack. When the table is empty at the top of the device the table is removed and the carrier 2 is automatically disengaged from pin 3 (Fig. 3, not shown) where the chain 1 passes over the top chain wheel 6. The guide elements 4 slide back down the guide bars 5 under their own weight, their motion being retarded by a braking device (14, 15, 16), (Fig. 1, not shown) before they reach stops 21. During this downward movement, angle-irons 8 strike the oblique surfaces of resilientlymounted pawls 17 and push them into their respective housings 20 in the next feed table 7; the pawls then spring back into their extended position to co-operate with the angle-irons during the next feeding cycle.