GB685037A - A new or improved mechanism for feeding sheets of paper or the like to rotary drum printing or like machines - Google Patents

Abstract

685,037. Feeding sheets. BACKHOUSE, H T. Nov. 8, 1949 [Nov. 12, 1948], No. 29489/48. Class 100 (i). Sheets are fed from a layboard 12 to grippers carried on e.g. a rotating printing drum 14 by a suction gripper device arranged to grip the sheet and feed it at a speed slightly greater than the drum to registering stops 28 on the drum 14, the registered sheet being held by grippers on the drum. In one form, Fig. 1, a stream feed is fed down a layboard 12 having a gap 24 on which a suction nozzle 10 is reciprocated by the aid of a guide 18. The front edges of the. sheets are registered by a stop 26 constructed as described in Specification 657,618, and when the stop is lowered the nozzle 10 advances the sheet over a guide 25 to the stops 28. In another form, Fig. 3, the sheets are advanced after registration by a hollow.suction roller 52 having suction apertures 56 which register in succession with a suction conduit 54. In a further form, Fig. 4, the sheets are forwarded by a number of suction devices 60 carried by oscillating arms 62 which after the sheets are fed to the gripper stops advance to a position 60A. On the return motion of the arms 62 eccentric bearings 66, in which the arms are mounted, are rotated by a stop 74, moving with the arms, so that the nozzles 60 are moved away from the drum so as not to contact it. At the end of the return motion the eccentric bearings are rotated by a stop 72 to restore the position of the nozzles for taking another sheet.