Sheet-fed rotary printing machine with a turn-over mechanism

Details Sheet-fed rotary printing machine with a turn-over mechanism Sheet-fed rotary printing machine with a turn-over mechanism

1983-06-10

1984-05-15

Eickholt, E. H.

Printing

Multicolor

Rotary machines

271 82, 271277, 101232, B41F 516

Patent

active

044481250

ABSTRACT:
A sheet-fed rotary printing machine with a turn-over mechanism includes a turn-over cylinder interposed between printing cylinders in a pair of printing units and having a pair of gripper shafts mounted on an outer circumferential surface of the turn-over cylinder in diametrically opposite relation. A plurality of turn-over gripper devices are mounted at intervals on each of the gripper shafts, each turn-over gripper device being composed of a fixed turn-over gripper and a loosely fitted gripper pad assembly. The turn-over cylinder also has a cam mechanism for turning over the turn-over gripper devices and another cam mechanism for opening and closing the turn-over gripper devices. A plurality of suction levers are mounted on a suction lever shaft extending parallel to the gripper shaft in alignment with the turn-over grippers, the suction levers being angularly movable by a cam mechanism for limiting angular movement of the gripper pad assemblies during single side printing operation, and for attracting the trailing edge of a sheet during double side printing operation. With this arrangement, the sheet can be turned over by the printing cylinders and the single turn-over cylinder therebetween, and the turn-over grippers can be turned over and opened and closed about the gripper shaft in both the single and double side printing modes. The printing machine thus constructed is simple in construction, can grip sheets with high accuracy, and operate at high speeds.

REFERENCES:
patent: 2757610 (1956-08-01), Gegenheimer
patent: 3414259 (1968-12-01), Koch et al.
patent: 3455547 (1969-07-01), Rudolph
patent: 3534683 (1970-10-01), Barthel
patent: 3654861 (1972-04-01), Rudolph et al.
patent: 3796154 (1974-03-01), Weisgerber
patent: 3992993 (1976-11-01), Kuhn et al.
patent: 4018161 (1977-04-01), Johne et al.
patent: 4343241 (1982-08-01), Rudolph
patent: 4357870 (1982-11-01), Rudolph

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