| 摘要 |
The specification describes an apparatus for stacking and unstacking sheet material, more particularly glass sheets, comprising one or more suction plates, capable of moving towards a sheet material stack and adapted to be moved by a pressure cylinder actuator, and with a sensing member, which on making contact with the stack, the surface position of which changes as the stacking or unstacking progresses generates a pulse adapted to control movement of the piston rod of the pressure cylinder actuator. As a sensing member a switch (vacuum monitor, pressure monitor) responsive to changes in pressure is provided in the suction duct system of the suction plates and/or in the pressure duct system of the pressure cylinder actuator.
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