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Device for adjusting a sensor at a reference position corresponding to a reference track position of a read/write head

  • US 4,780,778 A
  • Filed: 11/24/1986
  • Issued: 10/25/1988
  • Est. Priority Date: 06/29/1983
  • Status: Expired due to Term
First Claim
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1. A device for adjustingly setting the position of a sensor which indicates when a carriage supporting a read/write head is in a position corresponding to a reference track position of a magnetic disk in a disk drive unit, comprising:

  • a chassis;

    a carriage movably mounted on said chassis and supporting the read/write head, said carriage being movable in a radial direction with respect to the magnetic disk so as to move the read/write head between a reference track position and any of a plurality of data track positions corresponding to tracks defined on the magnetic disk, wherein said carriage includes an arm portion having an end which is moved with said carriage in the radial direction between positions corresponding to the reference track position and the data track positions of said carriage;

    an adjustment plate mounted on said chassis and having one end portion as a pivot point pivotably secured to said chassis, an actuating end portion extended opposite from said one end portion in a transverse direction perpendicular to the radial direction which is pivotable for adjusting movement substantially along the radial direction, and a slot formed in said adjustment plate between said two ends extending substantially in the radial direction;

    a sensor mounted between the two ends of said adjustment plate for detecting the end of the arm portion of said carriage when it is in a reference position corresponding to the reference track position, said sensor being movable to adjust its position in the radial direction relative to the end of the arm portion in the reference position in conjunction with the adjusting movement of said actuating end portion of said adjustment plate;

    first securing means for pivotably securing said one end of said adjustment plate as a pivot point to said chassis; and

    second securing means adjustably secured through said slot to said chassis for securing said adjustment plate so as to fix an adjusted position of said sensor at the reference position of the end of the arm portion of said carriage corresponding to the reference track position.

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