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Dual encoder

  • US 9,560,724 B2
  • Filed: 09/28/2015
  • Issued: 01/31/2017
  • Est. Priority Date: 11/18/2014
  • Status: Active Grant
First Claim
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1. A dual encoder having comprising:

  • a housing;

    a first shaft rotatably mounted in the housing, the first shaft includinga first locking mechanism, for locking different rotational positions of the first shaft, andat least one first rotation signal generator, for generating a signal showing a switchover between two locking positions of the first shaft, anda second shaft being rotatably mounted in the housing, the second shaft coaxial with respect to the first shaft, the second shaft includinga second locking mechanism for locking different rotational positions of the second shaft andat least one second rotation signal generator for generating a signal showing a switchover between two locking positions anda first activation element associated with the first shaft;

    a second activation element associated with the second shaft, the first and second activation elements for transmitting adjusting movements onto the first shaft and the second shafta first locking ring arranged at the first shafta second locking ring arranged at the second shaft for co-rotation, the first and second locking rings made of a magnetizable material, the first and second locking rings having multiple radial extensions proximate the outer circumference of the first and second locking rings, andat least one magnet arranged in the housing, opposite to the radial extensions, wherein the width of the air gap between the magnet and the first and second locking rings varies, depending on the rotational position to vary a magnetic holding force and cause locking at different rotational positions of the first and second shafts with respect to the housing, said magnetic holding force depending on the width of the air gap.

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