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Automatic door control system

  • US 4,563,625 A
  • Filed: 05/17/1984
  • Issued: 01/07/1986
  • Est. Priority Date: 05/17/1984
  • Status: Expired due to Term
First Claim
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1. An automatic sliding door system of a type wherein at least one door is moved along a linear path between closed and opened positions by means of the rotary drive of an electric motor, said system comprising:

  • sliding door means movable between closed and opened positions;

    motor means to produce bidirectional multispeed rotary drive for drivably moving said sliding door means;

    motor control means to control the direction and speed of said motor means and produce dynamic braking therein comprising circuitry including a pulse width modulator to control the speed of the motor means and a braking resistor for effecting dynamic braking of the motor meansposition means responsive to the rotary drive of the motor means to translate the rotary drive into a linear position scale and determine the direction of movement of the rotary drive and to produce position signals indicative thereof;

    sensor means to detect an activating event and produce an operate signal indicative thereof; and

    motion control means responsive to said position signals and operate signal to sequentially control and pace the operation of the motor means, said motion control means transmitting direction and speed signals to said motor control means.

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