Actuation apparatus

Details Actuation apparatus Actuation apparatus

1996-01-22

1998-03-31

Watson, Robert C.

Work holders

Relatively movable jaws

Means to actuate jaw

269 8, 269329, B25B 106

Patent

active

057329389

ABSTRACT:
An actuation apparatus for positioning a workpiece includes a movable electrically conductive member connectable to said workpiece, first electromagnetic actuating means energizable by a first AC voltage source to produce a first force acting on said movable member in a first direction, and second electromagnetic actuating means energizable by a second AC voltage source to produce a second force acting on said movable member in a second direction opposite to said first direction. The forces produced on the movable member by the actuating means are brought about by the interaction of eddy currents induced in the movable member with the magnetic fields produced by the first and second actuating means. The movable member can be moved to a desired position by appropriate energization of the first and second actuating means such that the first and second forces are equal at the desired position.

REFERENCES:
patent: 1226697 (1917-05-01), Rinsche
patent: 2381458 (1945-08-01), Meister
patent: 2967302 (1961-01-01), Loveless
Patent Abstracts of Japan, vol. 014, No. 041 (E-0879), 25 Jan. 1990 & JP-A-01 274406 (Shindengen Electric Mfg Co Ltd), 2 Nov. 1989.
Patent Abstracts of Japan, vol. 011, No. 357 (C-458), 20 Nov. 1987 & JP-A-62 127387 (Ishikawajima Harima Heavy Ind Co Ltd), 9 Jun. 1987.
Patent Abstracts of Japan, vol. 015, No. 131 (P-1186), 29 Mar. 1991 & JP-A-03 013802 9 (Furukawa Electric Co Ltd:The), 22 Jan. 1991.

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