Photocopying – Contact printing – Light boxes
Patent
1989-06-02
1991-05-14
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355311, 355 75, G03G 1504, G03B 2762
Patent
active
050160494
ABSTRACT:
A document detecting device for an image forming apparatus operates when a sensor supporting arm equipped with sensors is pivoted to a predetermined position below a document, the document size or the density of the image is detected by the combination of the detection results of the sensors. One of the combinations which is not used for the document size or density detection is used to detect that the sensor supporting arm is at its original position. This construction avoids such an error that the sensor supporting arm is misinterpreted as being at its original position when an irregular sized document is set.
When a new document is set, the data indicating the previous document size is accurately updated by the combined use of two switches. The first switch detects whether a document holding cover is opened less than a predetermined angle. The second switch detects whether the cover is completely closed. Thus, any potential errors which may occur when a new document is set by opening the cover less than the predetermined angle can be avoided.
REFERENCES:
patent: 4456372 (1984-06-01), Yamauchi
patent: 4692019 (1987-09-01), Morimoto et al.
Hanamoto Hiroyuki
Miyamoto Hirohisa
Onishi Takashi
Yoshida Keiji
Minolta Camera Kabushiki Kaisha
Pendegrass Joan H.
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