Sheet feeding or delivering – Feeding – Separator and conveyor
Patent
1976-07-02
1977-05-03
Schacher, Richard A.
Sheet feeding or delivering
Feeding
Separator and conveyor
271263, 271265, B65H 508
Patent
active
040210308
ABSTRACT:
A plurality of rollers each carried on an element pivoted on a support swing back and forth into engagement with respective continuously driven rollers to pinch a sheet delivered between the rollers by means of a vacuum lifter and advance it along a path. A motor on each support can vary the position of the respective movable roller relative to the fixed roller and the pivotal element is insulated from the support but abuts conductively thereagainst in a rest position. A controller connected between the support and the element detects abutment of the two contact surfaces which function as switches and operates a control system that can vary the spacing between each pair of rollers in accordance with the thickness of the sheet being fed to it. A too thick a sheet will push the rollers apart prematurely and open the switch and a too thin sheet will not push them apart before the vacuum lifter releases it. Each time the vacuum lifter releases a sheet a release signal is generated and, shortly commencement of the release signal, a tolerance signal which are fed to a circuit that also receives a signal each time the movable roller is lifted so as automatically to vary the spacing between the rollers.
REFERENCES:
patent: 3514099 (1970-05-01), Miller
patent: 3746333 (1973-07-01), Capetti
patent: 3826487 (1974-07-01), Forster
Fichte Frank
Paul Wolfgang
Schacher Richard A,.
Striker Michael J.
VEB Polygraph Leipzig Kombinat fur Polygraphische Maschinen und
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