Modulator screen drum assembly

Details Modulator screen drum assembly Modulator screen drum assembly

1974-07-31

1976-10-12

Gonzales, John

Photocopying

Including fiber optics

101116, G03G 1500

Patent

active

039854329

ABSTRACT:
A modulator screen drum assembly supports a multi-layer screen having the capability of selectively passing therethrough charged particles for aperture-controlled electrostatic printing. The drum assembly comprises a pair of rotatably supported end wall members axially positioned in spaced apart relationship. The modulator screen is secured to and wrapped around the end all members to provide a screen drum or cylinder. Adjusting means is provided for axially moving one of the end wall members relative to the other end wall member to stretch and tension the screen cylinder in a longitudinal direction, and locking means is provided for locking the adjusting means in the set position to thereby maintain the screen cylinder in properly tensioned and taut condition. A drive means is provided for simultaneously driving both of the end wall members at a uniform and constant velocity such that the screen drum assembly is rotatably driven at a uniform velocity to prevent distortion or twisting of the screen during a printing operation.

REFERENCES:
patent: 2282337 (1942-05-01), Mies
patent: 3556004 (1971-01-01), Mitter

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