Screwing apparatus

Details Screwing apparatus Screwing apparatus

1993-12-17

1994-10-11

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

053538820

ABSTRACT:
A screwing apparatus includes a multi-phase motor and a control device. The motor rotates a bit, installed on the motor, for rotating a screw. The control device controls a rotational speed of the motor by calculating a rotational speed of the bit based on commutation signals outputted from sensors installed on the motor, and controls a torque value of the bit by outputting instructions to the motor so that the bit is rotated at a predetermined torque value.

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), Soshin
patent: 5203242 (1993-04-01), Hansson

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