| 摘要 |
The invention relates to a safety arrangement in a package turning device. The package turning device is of the type which turns selected packages which are conveyed on a conveyor path through the package turning device. The package turning device essentially comprises a piston and cylinder assembly whose piston rod is disposed to move parallel with the conveyor path, a turning member and a gripping member. The safety arrangement includes an anchorage disposed on the piston rod of the piston and cylinder assembly, and a bracket. The bracket is disposed to support the turning member and the gripping member. The anchorage and the bracket are united in spring-biased fashion and enclose between them a cavity. An incoming air conduit and an outgoing air conduit are connected to the cavity. A pressure guard is disposed on the outgoing air conduit. The cavity is closed in the normal operation of the package turning device. When the gripping member is subjected to a force A, a gap occurs between the anchorage and the bracket and the pressure in the cavity becomes zero. The pressure guard on the outgoing air conduit emits a signal to the control system of the package turning device and the movement of the piston rod is arrested immediately.
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