Image forming apparatus with sheet feeder

Details Image forming apparatus with sheet feeder Image forming apparatus with sheet feeder

1989-01-23

1991-07-02

Bollinger, David H.

Sheet feeding or delivering

Feeding

Multiple supplies

271263, 271258, 271265, B65H 526

Patent

active

050280414

ABSTRACT:
An image forming apparatus uses a sheet feeder wherein sheets of paper are picked-up and fed one-by-one from a stack of sheets stacked on a tray. A sensor is provided to detect that the amount of sheets remaining on the stack reaches a predetermined level which corresponds to a small amount of sheets. The sensor produces a prewarning signal which indicates a low supply of sheets on the stack, although not empty to the operator. Or, when a plurality of sheet stacking trays or cassettes are used, the sheet feeding is switched so as to be carried out from another sheet stacking tray. The problems that occur when the paper supply is low can be avoided.

REFERENCES:
patent: 3260402 (1966-07-01), Lareau et al.
patent: 3854713 (1974-12-01), Kohda
patent: 3918704 (1975-11-01), Sugiyama et al.
patent: 4021032 (1977-05-01), Gross et al.
patent: 4265440 (1981-05-01), Shibazaki et al.
patent: 4347924 (1982-09-01), Hayashi et al.
patent: 4386769 (1983-06-01), Ito et al.
patent: 4449705 (1984-05-01), Shibuya et al.
patent: 4469320 (1984-09-01), Wenthe, Jr.
patent: 4484734 (1984-11-01), Tsudaka et al.
patent: 4589645 (1986-05-01), Tracy

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