Photoelectrophoretic web machine servo drive system

Details Photoelectrophoretic web machine servo drive system Photoelectrophoretic web machine servo drive system

1975-04-24

1976-11-16

Schacher, Richard A.

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226109, B65H 2522, B65H 3916

Patent

active

039919927

ABSTRACT:
A web drive system consisting of two independent speed controlled servos used to drive at least two webs is provided for use in a photoelectrophoretic web machine. The servo drive systems cooperate in the transporting of the webs to eliminate speed differential tensions between the two webs held together by friction and electrical tacking force. The first servo system may be bi-polar controlled. The second servo system may be uni-polar controlled and switched between speed and torque control modes. When the webs are held apart, the second servo system will be in speed control and whenever the webs are in contact, the second servo system is switched to the torque control mode.

REFERENCES:
patent: 3556509 (1971-01-01), Crum
patent: 3556510 (1971-01-01), Treff

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