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Apparatus for producing an adjusting torque

  • US 4,573,379 A
  • Filed: 05/11/1983
  • Issued: 03/04/1986
  • Est. Priority Date: 05/13/1982
  • Status: Expired due to Fees
First Claim
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1. The combination comprising a machine having a rotatable spindle for carrying a tool or workpiece, and apparatus having a roller worm gear mechanism coaxially supported on the spindle and including a threaded input member supported for coaxial rotation with and relative to said spindle and a threaded output member supported for axial displacement along the spindle and relative to said input member and a plurality of threaded rollers disposed between and threadably engaged with said input member and said output member for axially displacing said output member along said spindle in response to rotation of said input member relative to said output member, drive means for rotating said input member relative to said output member and said spindle and including an adjusting motor having a stator mounted in fixed position on the machine and a rotor for driving said input member, clamping force storage means supported to rotate with said spindle for receiving force transmitted thereto by axial displacement of said output member relative to said input member and including an element axially displacable in response to the force received by said force storage means, means for transmitting to the tool or workpiece said force stored by said force storage means, first pick-up means for detecting the axial displacement of said element and generating an output signal relative thereto, second pick-up means for detecting the speed of rotation of said spindle relative to said rotor and generating an output signal related thereto, and a motor control circuit responsive to output signals from said pick-up means for controlling the speed of said adjusting motor.

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