Screw supply control apparatus for screw tightening robot

Details Screw supply control apparatus for screw tightening robot Screw supply control apparatus for screw tightening robot

1993-07-30

1994-11-22

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5737, B25B 2304

Patent

active

053658108

ABSTRACT:
A screw supply control apparatus controls screw-feed operations of a screw feeder which sequentially supplies to a robot a plurality of screws. The apparatus includes a screw feeder having a screw air-feed pipe through which the screws are air-fed to the robot, and an air-feed valve provided to the screw air-feed pipe. Compressed air is fed into the screw air-feed pipe to air-feed the screw when the screw air-feed valve is open whereas compressed air is not fed into the screw air-feed pipe when the screw air-feed valve is closed. A screw passage sensor is provided at the screw air-feed pipe for sensing passage of the screw and produces a passage signal when the passage of the screw is sensed. A monostable multivibrator is provided for measuring a predetermined period of time and produces a time-up signal when the predetermined period of time is measured. A control unit controls the air-feed valve to open in response to the passage signal and then to close the air-feed valve in response to the time-up signal wherein the monostable multivibrator is controlled to start measurement of the predetermined period of time when the screw passage sensor produces the passage signal.

REFERENCES:
patent: 3648744 (1972-03-01), Bangerter
patent: 4333367 (1982-06-01), Taffer
patent: 4672866 (1987-06-01), Riera et al.
patent: 4776242 (1988-10-01), Poux et al.

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