Problem Sheet $3$

Problem:

It must be possible to operate the punching device from three sides.

A notch is to punched in the workpiece by a pneumatic cylinder. The workpiece may be fed from any one of three work stations. The punching operation is to be triggered when $2$ sensors emit a signal. The signaling elements $a,b$ and c are installed for sensing$.$ The cylinder returns to its retracted position when the part is pulled out of the device.

Positional Sketch: