Size detecting device of a copy document suitable for electropho

Details Size detecting device of a copy document suitable for electropho Size detecting device of a copy document suitable for electropho

1982-10-14

1986-02-25

Moses, R. L.

Photocopying

Including fiber optics

250560, 355 3R, G03G 2100

Patent

active

045726507

ABSTRACT:
An electrophotographic copying machine includes a device for detecting the size of a copy document on a document table. The device has at least two light receiving elements directed to detect, in combination, a single size of the copy document. The two light receiving elements are responsive to the size of the copy document for outputting two document size signals. The document size signals have the same signal levels when the two light receiving elements are both prevented from receiving light by the document, or different signal levels when either of the light receiving elements is prevented from receiving light by the document. The copying machine comprises a detection circuit responsive to the document size signals for calculating the possible difference of the document size signal levels and detecting the particular size of the copy document.

REFERENCES:
patent: 4338020 (1982-07-01), Yakawa et al.
patent: 4341460 (1982-07-01), Kohyama
patent: 4456372 (1984-06-01), Yamauchi

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