Inductive proximity circuit for machine tool - has oscillator transistor output signal compared with external signal for switching initiation

摘要

The inductive proximity switch consists of a transistor-oscillator, with one of its states utilised for providing an output signal (uA). The circuit includes a LC osillating subcircuit (10) for determining the path or position and the mature of the electrically conducting body (21) detected, as it enters the electromagnetic field of the coil (11). There is an oscillator-transistor (1) with its collector (2) in series with a second LC oscillating subcircuit (3) consisting of a coil (5) and a capacitor (4), connected to one pole (18) of a voltage source (6) in such a way that the oscillator-transistor is influenced by the presence of a body in a certain range. The output signal is compared with an external signal and then a switching process can be initiated. The emitter (7) and the collector (2) of the oscillator-transistor are bridged by a condenser (16). USE/ADVANTAGE - Improved response, maintained over long period. For machine tools.