System and method for activating an operating element with respe

Details System and method for activating an operating element with respe System and method for activating an operating element with respe

1986-09-11

1988-03-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250561, 250571, 356429, 226 20, 242571, B65H 2526

Patent

active

047315423

ABSTRACT:
A system for activating an operating element with respect to a moving substrate comprises a tracking line formed on the substrate, the tracking line having an activation mark formed therein which reflects light of an intensity which is distinguishable from that reflected from the remainder of the tracking line. A photosensor is mounted in relation to the tracking line to sense the intensity of light reflected from the tracking line when the substrate is moving. The photosensor generates an output signal indicative of the passage of the activation mark with respect to the photosensor. The output signal is utilized to activate the operating element.

REFERENCES:
patent: 4485982 (1984-12-01), St. John et al.
patent: 4569584 (1986-02-01), St. John et al.
patent: 4641070 (1987-02-01), Pfizenmaier et al.
patent: 4641198 (1987-02-01), Ohta et al.

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