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Rotation detecting apparatus

  • US 4,914,831 A
  • Filed: 02/24/1989
  • Issued: 04/10/1990
  • Est. Priority Date: 03/04/1988
  • Status: Expired due to Term
First Claim
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1. A rotation detecting apparatus comprising:

  • a casing;

    a first wheel mechanism disposed inside said casing;

    rotation detecting means for detecting rotation of said first wheel mechanism;

    a second wheel mechanism for measurement disposed at said casing such that a periphery of said second wheel mechanism does not protrude from an outer surface of said casing; and

    a moving member for moving said second wheel mechanism to such a location that rotation thereof is transmitted to said first wheel mechanism and part of said second wheel mechanism is exposed from said outer surface of said casing.

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