| 摘要 |
Apparatus for accumulating stacks of paper sheets has a cross cutter which repeatedly severs several overlapping running paper webs to form a series of groups of overlapping sheets. Such groups are accumulated into layers at a gathering station, and successively formed layers are engaged and withdrawn by a transfer unit which delivers the layers into the range of a withdrawing conveyor serving to deliver the layers to a stack forming station. The operation of the transfer unit is controlled by a rotary camshaft which is driven by the prime mover for the cross cutter through the medium of a computer-controlled step-down transmission arrangement having a compensating transmission whose control shaft is adjustable by the computer, whose input member receives torque from the prime mover and whose output shaft drives the camshaft through the medium of a change-speed transmission, an adjustable planetary transmission, a bevel gear transmission and a gear transmission. The ratio of number of machine cycles (each of which involves the formation of a group of sheets) to a working cycle (involving the withdrawal of a layer from the gathering station) can be varied by the transmission arrangement by varying the frequency at which the transfer unit removes layers from the gathering station. This renders it possible to accumulate stacks wherein the number of sheets need not be a whole multiple of the number of sheets in a layer.
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