Sheet feeding or delivering – Feeding – Separators
Patent
1976-08-31
1977-10-04
Schacher, Richard A.
Sheet feeding or delivering
Feeding
Separators
271 31, 271126, 271159, 271155, B65H 312
Patent
active
040520510
ABSTRACT:
A top-of-stack sheet feeder includes a stack lifting apparatus which provides uniform stack pressure at the feeder as well as stack replenishment without interruption of feeder operation. The stack lifting apparatus includes a comblike feeding platform which incrementally elevates a feed stack to a feed roller which removes successive top sheets. Platform elevation control is responsive to requirement signals generated by a top sheet height sensor. When the stack is depleted to a predetermined reserve, a pair of opposed comblike feeding decks interfit between spaces in the feeding platform and assume the stack elevation function after which the platform descends to a loading station to receive a new stack and lift same to the decks. Upon introduction of the new stack, the decks disengage the reserve and index to a lower dwell station ready to again resume stack lifting when the combined stack reaches the reserve level.
The feed roller includes a perforated sleeve rotating about a fixed core having a peripherally open vacuum sector. The top sheet is lifted from the stack by the vacuum, assisted by a pair of air rifflers which induce air jets under the top sheet and is transported to acceleration rollers by the rotation of the feed roller.
REFERENCES:
patent: 2058979 (1936-10-01), Henry
patent: 2247466 (1941-07-01), Baker
patent: 2654603 (1953-10-01), Williams
patent: 2952458 (1960-09-01), Watts
patent: 2997298 (1961-08-01), Elliott
patent: 3035835 (1962-05-01), Reif
Mersereau Robert E.
Silverman Harold
Pitney-Bowes Inc.
Schacher Richard A,.
Scribner Albert W.
Soltow, Jr. Wiliam D.
Walker Donald P.
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