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Positioning apparatus

  • US 5,941,359 A
  • Filed: 08/21/1997
  • Issued: 08/24/1999
  • Est. Priority Date: 02/15/1995
  • Status: Expired due to Fees
First Claim
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1. A positioning apparatus comprising:

  • a rotation detecting sensor coupled to a rotary shaft for rotating or rectilinearly driving a control object for outputting two or more pulses having a phase difference with rotation of the rotary shaft;

    normal-reverse rotation discriminating means for discriminating normal rotation of the rotary shaft from reverse rotation thereof on the basis of a relationship between phases of the two or more pulses output from the rotation detecting sensor;

    pulse counting means for adding or subtracting the pulses output from the rotation detecting sensor in response to a discriminating signal output from the normal-reverse rotation discriminating circuit;

    first decelerating position storing means for holding at least one decelerating position where low-speed driving operation is to be started;

    second decelerating position storing means for holding at least one decelerating position where braking operation is to be started;

    first and second decelerating position comparing means for comparing a value counted by the pulse counting means with first and second decelerating positions held by the first and second decelerating position storing means;

    a rotation driving source for rotating the rotary shaft;

    a rotation speed controller for rotating the rotary shaft of the rotation driving source at a constant speed by inverter control;

    driving control means for outputting a decelerating signal for changing a control speed to the rotation speed controller on the basis of a result of comparison output from the first decelerating position comparing means;

    a brake device capable of decreasing at least the rotation speed on the basis of a result of comparison output from the second decelerating position comparing means; and

    brake control means for outputting a brake signal to the brake device.

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