Dual mode stack sensor

Details Dual mode stack sensor Dual mode stack sensor

1982-05-03

1984-09-04

Stoner, Jr., Bruce H.

Sheet feeding or delivering

Feeding

Separators

271 31, 271 94, 271105, 271165, B65H 312, B65H 348, B65H 714

Patent

active

044693206

ABSTRACT:
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 feeding from the 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 the 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 the 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.

REFERENCES:
patent: 3945633 (1976-03-01), Knopp
patent: 4076408 (1978-02-01), Reid et al.
patent: 4231562 (1980-11-01), Hori
patent: 4269406 (1981-05-01), Hamlin
patent: 4278344 (1981-07-01), Sahay
patent: 4299381 (1981-11-01), Smith
patent: 4336923 (1982-06-01), Smith et al.
patent: 4397459 (1983-08-01), Silverberg et al.
"Stack Weight Sensing Paper Tray", Xerox Disclosure Journal, Stephen J. Wenthe, Jr., vol. 7. No. 4, Jul./Aug. 1982.
"Segmented Friction Drive", Timothy S. Pinckney, Xerox Disclosure Journal, vol. 5, No. 4, Jul./Aug. 1980, p. 375.
"Air Adjustment-Automatic", Stephen Wenthe, Xerox Disclosure Journal, vol. 5, No. 4, Jul./Aug. 1980, p. 383.
"Document Set Separator", James E. Hutton & Morton Silverberg, Xerox Disclosure Journal, vol. 5, No. 6, Nov./Dec. 1980, pp. 625-626.

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