Plastic processing machine, especially an injection molding machine, with vertically movable platen has safety catch to prevent unintentional motion of a under gravity

摘要

A movable platen (2) is driven up or down by a motor (8) by a signal from a machine controller (10) to the motor control (9). The machine controller (10) activates a retaining device (13) if any motion of the platen (2) is detected in the absence of a signal to the motor control (9) or rotation of the motor drive pulley (7).