Read-write apparatus for use in a conveyor control

• US 3,982,275 A
• Filed: 05/27/1975
• Issued: 09/21/1976
• Est. Priority Date: 05/27/1975
• Status: Expired due to Term

• Current Assignee: Alexandr Pavlovich Panov, Igor Kasianovich Mlynchik, Ivan Vasilievich Antonets
• Original Assignee: Alexandr Pavlovich Panov, Igor Kasianovich Mlynchik, Ivan Vasilievich Antonets
• Inventors: Mlynchik, Igor Kasianovich, Panov, Alexandr Pavlovich, Antonets, Ivan Vasilievich
• Primary Examiner(s): Tupper, Robert S.
• Application Number:
  US05/581,416
• Time in Patent Office: 483 Days
• Field of Search: 360/1, 235/61.11 D
• US Class Current: 360/1
• CPC Class Codes: B61L 25/046 using magnetic tags
• CPC Class Codes: B65G 47/496 by use of magnetic responsive means

Abstract

According to the invention, the conveyor control device, comprising an information carrier in the form of permanent magnets pressed into a nonmagnetic backing, and an information recording unit wherein pole pieces of a magnetic core are located on a common yoke with magnetizing coils. The opposite poles of the pole pieces are directed towards each other. In the process of recording the information carrier is introduced into a pole gap in the core. The information reading unit incorporates a nonlinear excitation circuit used to deliver current pulses to input electrodes of a magnetic field pickup, a decoder in the form of a diode bridge, a unit compensating for the magnetic field of the earth, a voltage source, and an output unit.

Claims

1. 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.

2. The apparatus as defined in claim 1, further comprising a unit connected in parallel with said pickup for compensating the magnetic field of the earth.

3. The apparatus as defined in claim 1, wherein said reading unit further includes two diodes and two additional output electrodes for said pickup, said additional electrodes being connected with one of said diodes, and said diodes being connected with said output unit.