Burns, Doane, Swecker & Mathis
Document detecting device for an image forming apparatus
 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. 
Minolta Camera Kabushiki Kaisha
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G03G G03G G03B G03G
inventional inventional inventional additional
Takashi Hirohisa Hiroyuki Keiji
Onishi Miyamoto Hanamoto Yoshida