Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1996-04-24
1998-02-10
Smith, Scott A.
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
173181, 81467, B25B 2314
Patent
active
057158940
ABSTRACT:
An impact screw-tightening apparatus is comprised of a main body and a controller. The main body includes a motor outputting pulsed drive output, a main shaft driven by the drive and connected to a screw to be tightened, and a torque detector detecting a change of torque applied to the main shaft. The controller includes a calculating section and a control section. The calculating section obtains frequency of impacts generated from a time that a bearing surface of the screw is in contact with a tightened object, on the basis of the signal from the torque detector. The control section cuts off a motive power source of the drive at a time that the frequency of the impacts becomes a predetermined value. Therefore, even if impact operation is executed prior to the contact of the bearing surface, the tightening force is accurately calculated by a rapid and brief calculation and control logic, and the dispersion of the tightening force at the cut-off time is decreased.
REFERENCES:
patent: 4987806 (1991-01-01), Lehnert
patent: 5154242 (1992-10-01), Soshin et al.
patent: 5181575 (1993-01-01), Maruyama et al.
patent: 5285857 (1994-02-01), Shimada
patent: 5289886 (1994-03-01), Shikata et al.
patent: 5366026 (1994-11-01), Maruyama et al.
patent: 5492185 (1996-02-01), Shoeps et al.
Maruyama Jun-ichi
Nabekura Tatsumi
Nissan Motor Co,. Ltd.
Smith Scott A.
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