Control system for rotary printing screens

Details Control system for rotary printing screens Control system for rotary printing screens

1976-10-06

1978-09-19

Suter, Ronald E.

Printing

Stenciling

Multicolor

101118, 101181, 101182, B41F 1510, B41F 1338

Patent

active

041145348

ABSTRACT:
A printing machine with several groups of rotary-screen printing units, designed to print different color components of complementary portions of a recurrent pattern on an elongate web moving continuously beneath their screens, includes a programmer such as a perforated-type reader controlling the operation of the several printing units of each group in timed relationship dependent upon the web speed. A speed changer enables the peripheral velocity of the screens to be set at values different from the web speed, the timing of the printing operations being determined by two speed sensors upstream and downstream of the speed changer. These operations include a lowering of the rotating screen onto the web at the beginning of a printing cycle, a lifting of the screen off the web at the end of a working phase of that cycle, and a stoppage of screen rotation during part of the ensuing idling phase. The stoppage is caused by the release of a normally arrested output element of a differential gearing inserted between the speed changer and the drive shaft of each screen.

REFERENCES:
patent: 3774534 (1973-11-01), Ichinose
patent: 3921519 (1975-11-01), Zimmer
patent: 3926111 (1975-12-01), Bohm
patent: 3934505 (1976-01-01), Kushner
patent: 3998156 (1976-12-01), Zimmer
Gears for Small Mechanisms, by W. O. Davis, pp. 249-254; pub. 1970; N.A.G. Ltd., London.

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