Work holders – Magnetic holder
Reexamination Certificate
2011-07-05
2011-07-05
Nguyen, George (Department: 3723)
Work holders
Magnetic holder
C269S045000, C269S043000, C269S2890MR
Reexamination Certificate
active
07971863
ABSTRACT:
An exemplary clamping apparatus includes a supporting body, a plurality of clamping units installed on the supporting body, a PWM controller, and a detection unit. Each clamping unit includes a magnet, a clamping pin, an electrical coil, and a coil core mechanically engaged with the clamping pin. The magnet is configured for holding the clamping pin at a target position. The PWM controller is configured for supplying a pulse signal to the respective electrical coil of each clamping unit and for thereby creating a magnetic force causing a corresponding coil core and a corresponding clamping pin to, synchronously, move. The detection unit is configured for detecting a back electromotive force representative of the arrival to the target position of a clamping pin and signaling the PWM controller to stop supplying the pulse signal. A clamping process utilizing the clamping apparatus is also provided.
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Chen Chien-Hung
Cheng Chen-Hsing
Hon Hai Precision Industry Co. Ltd.
Knapp Jeffrey T.
Nguyen George
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