SHINGLING AND STACKING OF CONVEYED SHEET MATERIAL WITH PRE-SHINGLING CONTROL OF SHEET FEED

摘要

ABSTRACTA conveyor system wherein sheets areconveyed from a cutter or the like at a givenspeed, are increased in speed before passing through avacuum conveyor shingling section , are slowed downat the shingling section and then normally proceed atthe slowed-down speed to a stacker which is adaptedto stack a fixed number of sheets before discharging astack. The sheets are basically handled in accordancewith the device disclosed in U.S. Patent 4,200,276. Toprevent scattering of the sheets during shingling dueto high input conveyor speeds and the like, the vacuumconveyor shingling section includes a second (orpre-shingling) conveyor upstream of the originalshingling conveyor . The pre-shingling conveyoroperates at a relatively high rate of speed while theoriginal shingling conveyor operates at a relativelylow rate of speed (which nevertheless may be as high asthe device of the patent) relative to the sheet inputspeed. A setting control is provided to pre-setthe pre-shingler conveyor speed in correlation with theinput speed of the sheets and the length of theindividual sheets. The pre-set pre-shingler conveyorspeed remains constant during operation of thedevice. Conveyors downstream of the pre-shingling conveyor run at speeds which are corre-lated to the speed of the supplemental pre-shinglingconveyor .