Air flow path switching device for printing apparatus

Details Air flow path switching device for printing apparatus Air flow path switching device for printing apparatus

1991-11-08

1993-08-31

Bollinger, David H.

Sheet feeding or delivering

Feeding

Multiple supplies

271 11, 271 98, B65H 344

Patent

active

052402371

ABSTRACT:
An air flow path switching device for a printing apparatus includes a sheet hopper which holds a plurality of sheets, a sheet switchback device for inverting the sheets so that both sides of the sheets can be printed on, sheet pickup devices associated, respectively, with the sheet hopper and the sheet switchback device for picking up sheets, and a blower device for supplying pressurized suction and discharge air to the sheet pickup devices. An air flow resistance existing in the sheet switchback device, when the sheet pickup device associated with the sheet hopper is connected to the blower, and an air flow resistance existing in the sheet switchback device, when the sheet pickup device associated with the sheet hopper is disconnected from the blower, are substantially equivalent.

REFERENCES:
patent: 4066252 (1978-01-01), Wick
patent: 4513956 (1985-04-01), Sigvarodt et al.
patent: 4553828 (1985-11-01), Burger et al.
patent: 4842263 (1989-06-01), Robertson
patent: 4928128 (1990-05-01), Stemmle

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