Patent ID: 6053082
Filing Date: 2000-04-25
Classification: B23B,Y10T

Abstract:
A tool holder comprising:a housing rotatable about a holder axis;a motor mounted on the housing and having an output rotatable about a motor axis transverse to the holder axis;a rotation sensor mounted on the housing and coupled coaxially to the motor;a drive wheel mounted on the rotary motor output and rotatable by the motor about the motor axis;a pair of shafts each having a screwthread, the screwthreads being of opposite hand;respective traveling nuts threaded on the shafts;respective wheels on the shafts coupled to the drive wheel, whereby rotation of the motor output synchronously rotates the shafts and oppositely displaces the nuts;a tool-holding slide displaceable transversely of the holder axis and fixed to the nut of one of the shafts;a counterweight displaceable transversely of the holder axis and coupled to the nut of the other shaft; andcontrol means inductively coupled to the motor and rotation sensor for electrically powering the motor in accordance with the position of the motor output as detected by the sensor and for thereby oppositely synchronously displacing the slide and counterweight.