Read-write apparatus for use in a conveyor control

{
  "publication_number": "US3982275A",
  "country": "US",
  "kind": "A",
  "title": "Read-write apparatus for use in a conveyor control",
  "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."
  ],
  "description_excerpt": "The present invention relates to automatic control systems of continuous transportation and more specifically it relates to a conveyor control device, and to its read-write apparatus. The present invention can be of use for controlling the transportation of piece loads by overhead load-carrying and pushing conveyors, monorails, floor-mounted conveyors and transporters and for controlling the rail traffaic. Of late, the known electromagnetic conveyor control devices comprising an information carrier, an information recording unit and an information reading unit are commonly provided with magnetic information carriers. Said carriers provide a simple and reliable means of recording information and its noncontact readout. The magnetic information carrier has determined the selection of a reading element sensitive to the magnetic field. The reading elements are made in the form of sealed magnetic-controlled contacts (hercons), inductance coils, Hall pickups, magnetic doides and magnetic resistors.\n\nIn elaborating such devices the basic problem lies in increasing the gap between the interacting units, simultaneously increasing their sensitivity and noise stability. Known in the art is a conveyor control device comprising an information carrier, an information recording unit and an information reading unit. The information carrier is made up of permanent magnets spaced at a certain distance along the body of the information carrier. The information recording unit is constituted by an electromagnet while the information reading unit is made in the form of a permanent magnet suspended from a spring.",
  "cpc": [
    "B61L 25/046",
    "B65G 47/496"
  ],
  "ipc": [
    "B61L 25/04",
    "B65G 47/49"
  ],
  "assignees": [
    "ANTONETS IVAN VASILIEVICH",
    "MLYNCHIK IGOR KASIANOVICH",
    "PANOV ALEXANDR PAVLOVICH"
  ],
  "inventors": [
    "ANTONETS IVAN VASILIEVICH",
    "MLYNCHIK IGOR KASIANOVICH",
    "PANOV ALEXANDR PAVLOVICH"
  ],
  "filing_date": "1975-05-27",
  "publication_date": "1976-09-21",
  "grant_date": "1976-09-21",
  "priority_date": "1975-05-27",
  "application_number": "US-58141675-A",
  "family_id": "24325122",
  "citations": [
    "US2857059A",
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  ]
}