| 摘要 |
An apparatus for stacking sheets has a frame defining a stacking station, a conveyor for delivering the sheets continuously one after the other at a predetermined upper level in a transport direction to the station, and a platform vertically displaceable in the stacking station between the upper level and the lower level. The antidrop protector includes a vertically extending rack fixed on the frame, a lever pivoted on the platform adjacent the rack and having a pair of arms one of which is connected to a lift cable, a stop on the other of the lever arms engageable in the rack, and a spring braced between the platform and the lever. The cable is connected to a drive that tensions the cable, displaces the platform vertically, and rotates the lever in one rotational sense. The spring urges the lever in the opposite sense so that when the cable is detensioned the spring urges the stop into the rack and vertically arrests the platform.
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