Transfer element detect device

Details Transfer element detect device Transfer element detect device

1995-10-16

1996-11-19

Moses, R. L.

Photocopying

Contact printing

Light boxes

355326R, G03G 1514

Patent

active

055768199

ABSTRACT:
A transfer element detect device which, for use in an image forming apparatus such as a copying machine, a facsimile, a laser printer and the like, can detect accurately whether a transfer element such as copying paper or the like is present at a given position of transfer element attracting means or not. A threshold value is set in accordance with a peak value Pd' on the side of the received light signal level (curved line C) of the received light signal levels (curved line D') of the light sensor when a transfer element is not attracted on transfer element attracting means. After then, in accordance with the thus set threshold value S, it is detected whether the transfer element is present on the transfer element attracting means or not.

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