Web lateral position control system using both coarse and fine m

Details Web lateral position control system using both coarse and fine m Web lateral position control system using both coarse and fine m

1986-07-07

1987-09-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, G01N 2186, G06K 7015

Patent

active

046941819

ABSTRACT:
A method and apparatus for controlling the lateral position of a moving web in a dual control mode system. The control system ordinarily operates in a precise, highly-sensitive fine mode but is automatically switched into a less precise but rapidly responding coarse mode in response to loss of control in the fine mode. After control is reestablished in the coarse mode, the coarse mode control is terminated and the fine mode control is resumed.

REFERENCES:
patent: 4077579 (1978-03-01), Seleski et al.
patent: 4084099 (1978-04-01), Harvey et al.
patent: 4110627 (1978-08-01), Isherwood
patent: 4146797 (1979-03-01), Nakagawa
patent: 4485982 (1984-12-01), St. John et al.
patent: 4527069 (1985-07-01), Pfizenmaier
patent: 4547800 (1985-10-01), Masaki

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