Dual mode stack sensor

Details Dual mode stack sensor Dual mode stack sensor

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03

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340/123, 314/32

G03G 15/00 (2006.01) B65H 3/12 (2006.01) B65H 3/48 (2006.01) B65H 5/00 (2006.01) B65H 7/02 (2006.01) B65H 7/04 (2006.01)

Patent

CA 1200869

-1- ABSTRACT OF THE DISCLOSURE In a sheet feeder wherein sheets are fed from the bottom of a stack of the sheets in a stack support there is disclosed an automatic integral plural mode sheet stack sensor which, in a first mode, controls a variable pneumatic feeding means in response to sensing the height of the stack of sheets, and which, in a second mode, provides a signal indicative of the feedingfrom said stack support of all of the sheets in the stack. As further disclosed,a finger member is resettable on top of the stack of sheets, and a first switch is actuable by a first position of the finger member to increase the output of an air knife for assisting the bottom sheet feeder when said finger member is reset on top of the stack of sheets and the height of the stack of sheets exceeds a preset level, and a second switch is actuable for the second mode by the dropping of the finger member into a second position in response to all of the sheets being fed out from under said finger, and a fed sheet counter is connected to control the same variable pneumatic control so as to override the first mode control from the sheet stack sensor if a number of sheets is counted exceeding a preset count before the second mode signal.

405756

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