Arrangement for low-vibration sheet transfer between printing un

Details Arrangement for low-vibration sheet transfer between printing un Arrangement for low-vibration sheet transfer between printing un

1981-12-22

1983-10-11

Burr, Edgar S.

Printing

Multicolor

Rotary machines

101177, B41F 2100

Patent

active

044085257

ABSTRACT:
An arrangement for the transfer and conveyance of sheets between first and second printing units of a multi-color lithographic press which includes a receiving drum in the first printing unit, a feed drum in the second printing unit, impression cylinders associated with the drums, an endless chain, which includes links joined by pins, trained about the drums, and a guide rail following the path of the chain. A plurality of gripper carriages moveable on the rail are each coupled to the chain for movement therewith by a carriage coupler, each coupler including a drive roller on the chain mounted outboard parallel to the pins thereof. Each gripper carriage includes a yoke for snugly embracing the drive roller on the chain. The feed drum includes a radially mounted drive fork for engaging the cam roller of each gripper carriage as it comes into the vicinity of the feed drum in order to achieve a condition of accurate register between the feed drum and the gripper carriage. Each yoke is resiliently mounted with respect to its carriage to permit slight accommodating movement of the carriage along the direction of the chain so that each carriage is sequentially in a phase position which is dependent only upon the phase position of the feed drum for accurately phased transfer of the sheet with respect to the associated impression cylinder.

REFERENCES:
patent: 2756995 (1956-07-01), Koch
patent: 2821390 (1958-08-01), Norton
patent: 3591169 (1971-07-01), Preuss
patent: 3767929 (1974-03-01), Deacon et al.
patent: 4260149 (1981-04-01), Melzer

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