Electrically operated chucking apparatus

Details Electrically operated chucking apparatus Electrically operated chucking apparatus

2005-12-13

2005-12-13

Trinh, Minh (Department: 3729)

Metal working

Means to assemble or disassemble

Means to assemble electrical device

C029S739000, C029S709000, C269S008000, C269S071000, C279S134000

Reexamination Certificate

active

06973714

ABSTRACT:
An electrically operated chucking apparatus including (a) an electrically operated chuck including at least two movable members movable toward and away from each other, and at least two drive devices which include respective electrically operated actuators operable to move the at least two movable members, respectively, toward and away from each other, and (b) a control device operable to control the at least two drive devices, and wherein the control device includes: a drive control portion operable to control the at least two drive devices such that each of at least one of an actual position and an actual speed of movement of the at least two movable members changes toward a predetermined target value; and a load detecting portion operable to detect a load acting on the at least two movable members during operation of the drive control portion to control the at least two drive device. The drive control portion is arranged to command the at least two drive devices to terminate movements of the at least two movable members when the load detected by the load detecting portion has increased to a predetermined threshold.

REFERENCES:
patent: 4327848 (1982-05-01), Weiler
patent: 5657533 (1997-08-01), Fukui et al.
patent: 5822847 (1998-10-01), Arakawa et al.
patent: 6493927 (2002-12-01), Isogai et al.
patent: 6760968 (2004-07-01), Mimata et al.
U.S. Appl. No. 09/745,442, filed Dec. 26, 2000, Isogai et al.

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