Read-write apparatus for use in a conveyor control

A read-write apparatus for use in a conveyor control device located on the track of the conveyor, the apparatus comprising (1) a carrier having a non-magnetic backing and serving for information recording, storage and playback during its movement along the track;

• permanent magnets pressed into said backing and spaced at preset distances;
• (2) a unit for recording the information, including a magnetic core to concentrate magnetic flux in a gap formed between a pair of substantially parallel limb portions of the latter, and having pole pieces spaced in pairs at preset distances, on opposite sides of said carrier, and having opposite poles that are directed towards each other;
• coils located on said pole pieces for magnetizing said core, to generate an electric signal that builds up the flux in said core;
• a yoke for said core, common for said pole pieces;
• (3) a unit located on said track for reading the information, including a magneticfield pickup for determining the magnitude and direction of the magnetic field built up by said carrier during its movement along the track;
• input and output electrodes in said pickup;
• a non-linear excitation circuit in said reading unit for increasing the amplitude of the current pulses on said input electrodes, the input of said excitation circuit being connected with said voltage source, while its output is connected to one of said input electrodes;
• (4) voltage source means for at least one of said recording and said reading units;
• (5) a decoder of heteropolar pulses in said reading unit for separating signals of opposite polarities;
• and (6) an output unit, also in said reading unit, for generating a signal;
• said decoder being made in the form of a diode bridge which connects said output electrodes with said output unit.