Document size-detecting device of copying machine

Details Document size-detecting device of copying machine Document size-detecting device of copying machine

1984-01-13

1985-09-17

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for original

250578, G03B 2762, H01J 4014

Patent

active

045417130

ABSTRACT:
A copying machine having an optical scanner adapted to transfer an optical image onto a photoreceptor during movement between the scanner and the object to be copied. A platen cover with a document-holding surface bears against the document being copied and is provided with a plurality of colored portions corresponding to various sizes of documents in the scanning direction. There is a light projector which irradiates the surface of the platen, including the colored portions, and a light-receiving means adapted to distinguish the colored portions from the rest of the surface. The light receiving means generates an output signal which corresponds to the colored portions and there is a means for determining, from the output, whether the signal is in the range corresponding to the wavelength of the colored portions.

REFERENCES:
patent: 4338020 (1982-07-01), Yukawa et al.
patent: 4511246 (1985-04-01), Nishiyama

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