Screwing apparatus

Details Screwing apparatus Screwing apparatus

1993-12-17

1994-11-08

Smith, Scott A.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

81469, 7386223, B25B 2314

Patent

active

053618521

ABSTRACT:
A screwing apparatus includes a motor for rotating a bit for rotating a screw, a torque detecting device for detecting torque of the bit, and a control device. The control device increases magnitude of fastening torque by applying slight vibration to a torque instruction to be transmitted to the motor after the screw which is to be fastened at a value of target fastening torque is seated on a workpiece, and turns off electric current to be supplied to the motor via the torque instruction when the torque of the bit feedback from the torque detecting device to the control device has attained to the value of the target fastening torque.

REFERENCES:
patent: 4554980 (1985-11-01), Doniwa
patent: 4562389 (1985-12-01), Jundt et al.
patent: 4858312 (1989-08-01), Van Naarden
patent: 5004054 (1991-04-01), Sheen
patent: 5154242 (1992-10-01), Sashin et al.
patent: 5203242 (1993-04-01), Hansson

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