Up-and-down type paper feeding device

Details Up-and-down type paper feeding device Up-and-down type paper feeding device

1989-11-08

1992-01-28

Olszewski, Robert P.

Sheet feeding or delivering

Feeding

Multiple supplies

271110, 271152, B65H 344

Patent

active

050837621

ABSTRACT:
When a main body of an image forming apparatus is operated so that an image formation mode is set, a signal for determining which of several up-and-down type paper feeding devices is selected is applied from the main body of the image forming apparatus. In the selected paper feeding device, a selection signal detector determines that this selection signal is applied. If a paper detector determines that there are copy sheets whose number is at least a predetermined number, the paper deck is automatically raised by an up-and-down mechanism, even if the paper deck is in the lowered position. Even in the case where no up-and-down type paper feeding device is selected, if a timer measures time previously set, the paper deck may be automatically raised to a position where copy sheets can be fed. The up-and-down type paper feeding device according to the present invention has been constructed as described above and thus, an operator need not perform any operation so as to raise the paper deck from the lowered state. Consequently, there is provided an up-and-down type paper feeding device having good operability and capable of quickly and smoothly feeding copy sheets.

REFERENCES:
patent: 3820777 (1974-06-01), Reehil
patent: 3947015 (1976-03-01), Funk et al.
patent: 4660820 (1987-04-01), Shino et al.
patent: 4770403 (1988-09-01), Katsumata et al.
patent: 4879575 (1989-11-01), Maruta et al.

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