Sheet edge detector

Details Sheet edge detector Sheet edge detector

1988-10-04

1989-10-17

Prescott, A. C.

Photocopying

Contact printing

Light boxes

355204, 355316, 355317, 355318, 355319, 271152, 271265, G03G 1500

Patent

active

048749583

ABSTRACT:
An apparatus which determines the location of an edge of an advancing sheet and discriminates between a hole therein. After the leading edge of the sheet is detected and the sheet has moved a first predetermined distance, the absence or presence of the sheet is sensed for a second predetermined distance. If the sheet is not detected as it moves the second predetermined distance, the control logic indicates that the trailing edge has been detected. In the event the sheet is sensed, the control logic indicates that a hole has been detected and the process is repeated to locate the trailing edge.

REFERENCES:
patent: 4302105 (1981-11-01), Sick
patent: 4323311 (1982-04-01), West et al.
patent: 4485949 (1984-12-01), Gebhart et al.
patent: 4580890 (1986-04-01), Sugizaki et al.
patent: 4609815 (1986-09-01), Hishinuma et al.
patent: 4641272 (1987-02-01), Sasaki et al.
patent: 4681425 (1987-07-01), Tanimoto
patent: 4733281 (1988-05-01), Yoshinaga et al.
patent: 4763162 (1988-08-01), Yagasaki

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