Method and apparatus for preventing misregistration between plat

Details Method and apparatus for preventing misregistration between plat Method and apparatus for preventing misregistration between plat

1989-09-28

1991-08-27

Fisher, J. Reed

Printing

Rolling contact machines

Rotary

101248, 101486, B41F 1314, B41F 522

Patent

active

050423800

ABSTRACT:
A sheet type printing press is disclosed which includes a transmission assembly that prevents misregistration of plate and blanket cylinders upon their separation. The assembly also permits the press to be advanced or retarded while running to either correct misregistration or to start a new job using the same plate cylinders. A double harmonic drive is used to advance or retard the press. The harmonic drive is mounted to a hub which causes one of the circular splines and flexsplines thereof to be maintained under constant load. Such loading prevents misregistration when the plate cylinder drive gear is disengaged.

REFERENCES:
patent: 3565006 (1971-02-01), Stewart
patent: 3724368 (1973-04-01), Treff
patent: 4072104 (1978-02-01), Schaffer
patent: 4363270 (1982-12-01), Ury et al.

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