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Mechanically decoupled capstan drive

  • US 7,391,173 B2
  • Filed: 06/30/2006
  • Issued: 06/24/2008
  • Est. Priority Date: 06/30/2006
  • Status: Active Grant
First Claim
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1. A capstan drive comprising:

  • a first capstan to move a device on a carriage;

    a first power transmission having a driven shaft coupled to the first capstan, a first drive shaft coaxial with the driven shaft to receive a first rotary motion for driving the device, and a second drive shaft coaxial with the driven shaft;

    a second capstan to receive a second rotary motion to move the carriage; and

    a second power transmission to couple the second rotary motion to the second drive shaft, the second power transmission having a drive ratio such that if there is no first rotary motion, a first cable is driven by the first capstan at a same rate as a second cable is driven by the second capstan in response to the second rotary motion.

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