Electronic control circuitry for a nutrunner

Details Electronic control circuitry for a nutrunner Electronic control circuitry for a nutrunner

1990-08-15

1991-01-29

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

7386223, 173 12, B25B 23151

Patent

active

049878069

ABSTRACT:
Generally there is provided a nutrunner appliance for automatically driving a nut having an electrical motor, gearing, and a strain gauge to monitor the applied torque. The control system employs analog comparator circuits acting on analog signals from the strain gauge to determine the torque being applied. During operation, the comparator detects a predetermined torque and shifts the motor to a lower velocity to lower the inertia of the system. When the strain gauge output corresponds to the desired final torque, a braking action is applied to the motor to quickly terminate the applied torque.

REFERENCES:
patent: 4669319 (1987-06-01), Heyraud
patent: 4813312 (1989-03-01), Wilhelm

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