Patent ID: 6349606
Filing Date: 2002-02-26
Classification: F16H,Y10T

Abstract:
Apparatus comprising:a carriage movable along a path between first and second points; first and second motors coupled to the carriage for moving it in first and second opposite directions, respectively, between the first and second points; motor control circuitry coupled to the first and second motors for powering the motors such that each motor opposes the motion of the other, with a direction of motion of the carriage being determined by the motor generating the higher carriage moving force; said motors each generating a torque for moving the carriage in said respectively first or second directions when the motors are powered, each motor having a drive shaft which rotates in a direction determined by the motor generating the higher torque; said motors being rigidly coupled to a single threaded nut mounted for screwing movement axially along a drive screw, the direction of advance of the nut along the screw being a function of the relative torques generated by said motors, and said carriage being connected to said nut and driven thereby axially along said drive screw in exact correspondence with the axial movement of said nut along said screw.