Sheet supplying device

Details Sheet supplying device Sheet supplying device

1990-10-24

1991-12-31

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Separators

271106, 271108, 271265, 271266, 271110, B65H 334

Patent

active

050759396

ABSTRACT:
A sheet feeding system for ensuring feed of a single sheet includes a suction cup for holding the uppermost sheet of a stack. During initial lifting of the sheet, movement of the suction cup is halted for a predetermined time to allow sheets which have clung, by static attraction or otherwise to the uppermost sheet, to return to the stack. The initial lifting of the sheet takes place by swinging the suction cup about an axis. Thereafter the suction cup is lifted vertically to bring the topmost sheet into position to be taken up by portion feeding rollers and fed into a feed path. A stack empty detector employs a swinging arm which is positioned above the position the position of initial displacement of the suction cup so that, even if the last few sheets of the stack are initially attracted by the suction cup, the indicator will be prevented from giving a spurious "stack empty" signal.

REFERENCES:
patent: 2185652 (1940-01-01), Spiess
patent: 3637203 (1972-01-01), French
patent: 4621800 (1986-11-01), Bayer et al.
patent: 4637598 (1987-01-01), Bouwens et al.
patent: 4730823 (1988-03-01), Barela et al.
patent: 4848764 (1989-07-01), Tajima
patent: 4968019 (1990-11-01), Tanabe et al.

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