To simply and surely transmit a signal to a control-evaluating unit out of a cylinder by receiving a signal of a light source at a rotary angle position of the cylinder by a light receiving element fixed to a frame, and connecting the stationary evaluating unit for processing a signal of a registering pin so as to transmit the signal to the unit.
Electrically scannably registering pins 2.1, 2.2 axially isolated from each other in a cylinder 1 are to be electrically isolated from a clamp bar or a cylinder 1 and operated as a switch to be operated by a contact with a plate. Switch signals of the pins 2.1, 2.2 are supplied to a driver 4 disposed in the cylinder 1. A light emitting diode type light source 5 or other type light- emitting means is connected to rear of the diver 4, which is connected to a power source such as a battery, a storage battery or the like disposed in the cylinder. A light receiving element 5 is provided together with a driver 7 forward of a stationary control-evaluating unit 8 at a suitable distance from a frame and controlled.
ROTHER MICHAEL
BIERNOT PETER
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