GB803027A - Improvements in or relating to sheet conveying mechanism of printing machines - Google Patents

Abstract

803,027. Sheet-gripiper mechanism. FABER & SCHLEICHER A. G. March 12, 1956 [March 12, 1955], No. 7634/56. Classes 100(1) and 100(2) In sheet-conveying apparatus for conveying sheets in or from a printing-machine, the grippers are mounted on a carrier 3 secured to a chain conveyer and in each set of grippers the upper one 9, Fig. 1, or 34, Fig. 5, has rests in its closed position on an abutment on the carrier 3, and the lower gripper 14 or 24 is movable relatively to the carrier. AS shown in Fig. 1, the gripper shaft 4 is rotatable in bearings in the carrier 3, and is rocked from a fixed cam 50, Fig. 2 (not shown), through a follower roller and arm secured to the shaft. The gripper 9 is free on the shaft 4, has a projection 10 which meets an abutment 11 on the carrier 3 when the gripper is closed, and has a bearing 12 carrying a cross-pin 13 on which the lower gripper 14 is freely pivoted. The gripper 14 is forked, and between the forked limbs is a lever 15 pivoted on the pin 13. A pin 16 on the lower end of the lever engages an open slot in an arm 17 clamped to the shaft 4. The gripper 14 has a rearward extension 19, a screw 21 passes freely through the lever 15 and is screwed into the extension 19, and a compression spring 20 is arranged on the screw between 15 and 19. A second spring 22 is arranged between the two grippers. With the grippers open, when the shaft 4 is rocked counterclockwise, the arm 17 acts on the pin 16 first to pull down the gripper 9 so that the projection 10 meets the abutment 11, and then to compress the spring 20, to cause the gripper 14 to rock clockwise about its pivot 13 to press a sheet 2 firmly against the upper gripper 9. The grippers are to one side of an impression cylinder 1 from which the sheet is to be transferred, and the gripping surface of the gripper 9 lies on the same level as the surface of that cylinder. The screw 21 can be adjusted by inserting a tool through a hole 9a in the gripper 9. In the form shown in Fig. 5, the lower gripper 24 is pivoted on a pin 25 in a bracket in an abutment 27 formed on the carrier 3, and a spring 28, housed in a bore in the abutment, engages the tail of that gripper to urge it to open position against a projection 29. The intermediate lever 15 with its cross-pin 16, screw 21, and spring 20 are as above described. A cam-like member 30 clamped to the shaft 4 acts on the pin 16, and a projection 32 on the cam closes the upper gripper 34 by acting on a spring 31, and opens it by acting on a stop 36. In the closed position, the upper gripper 34 has a projection 33 which meets a seat 35 on the abutment 27.