Sheet feeding or delivering – Feeding – Separators
Patent
1974-10-10
1976-09-14
Love, John J.
Sheet feeding or delivering
Feeding
Separators
271 11, 271 30R, 271 98, 271104, 271106, 271108, B65H 308, B65H 348
Patent
active
039802930
ABSTRACT:
A sheet feeding device includes an elevator table for supporting a stack of sheets and a front sheet vacuum head for lifting and presenting the front edge portion of the top sheet to feed rolls. A rear sheet separator includes a pivoted vacuum shoe having a curved, vacuumized face for lifting the rear edge portion of the top sheet prior to directing a rear air jet forwardly between the top upper sheet and the underlying sheet, and prior to feeding of the sheet. A rearwardly directed air jet at the front of the stack cooperates with the rear jet to provide an air cushion beneath the top sheet. The rear sheet separator shoe is mounted on upper and lower links which are actuated by an air cylinder to roll the vacuum shoe along the sheet as the shoe lifts the top sheet. Thus, the vacuum applied to the vacuum shoe is not relied upon to physically move the shoe, and the vacuum can be low enough so that a porous top sheet will substantially block off the vacuum ports in the shoe and the second sheet will not be lifted by the shoe. Hold down feet mounted on bell cranks that actuate the shoe through links hold down the rear edge of the second sheet while the rear edge of the top sheet is being lifted to receive air from the rear air jet. The hold down feet are raised from the stack before the feed rolls feed the top sheet.
REFERENCES:
patent: 1684741 (1928-09-01), Nitsch et al.
patent: 2406765 (1946-09-01), Harrold
patent: 2941799 (1960-06-01), Reincke
Catto R. B.
FMC Corporation
Love John J.
Stoner Jr. Bruce H.
Tripp C. E.
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