Sheet feeding apparatus that uses a variable vacuum surface and

Details Sheet feeding apparatus that uses a variable vacuum surface and Sheet feeding apparatus that uses a variable vacuum surface and

1991-03-20

1993-01-26

Olszewski, Robert P.

Sheet feeding or delivering

Feeding

Separator and conveyor

271 96, 271 98, 271 99, 271104, 271171, B65H 508, B65H 308, B65H 334

Patent

active

051817063

ABSTRACT:
When stacking up recording papers on a tray and conveying one by one from the top or bottom, they are conveyed by attracting in vacuum to a conveying belt. An example of conveying from the bottom is illustrated. When one recording paper is conveyed, its rear end comes into the attraction region of the conveying belt, and the second recording paper is attracted into the region out of the first recording paper in the attraction region, which results in duplicate feed. Therefore, the size of the attraction region is variable depending on the size of the recording paper so that the attraction region of the conveying belt may not come out from the rear end of the recording paper until the first recording paper is conveyed and its front end is held by the rear rollers of the conveying belt or the like.

REFERENCES:
patent: 4219191 (1980-08-01), Rastorguyeff
patent: 4362380 (1982-12-01), Dragstedt
patent: 4469319 (1984-09-01), Robb et al.
patent: 4550903 (1985-11-01), Moore
patent: 4627606 (1986-12-01), Moore

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