Title:
AUTOMATIC ADJUSTABLE POWER CHUCK SYSTEM AND METHOD
Document Type and Number:
WIPO Patent Application WO1999051380
Kind Code:
A8
Abstract:
A power chuck system (10) is disclosed featuring a motor (23), a harmonic drive (31) and a chuck (14). The harmonic drive is arranged with an input member driven by direct connection with the motor rotor (23), and an output member (36) directly connected to a long stroke jaw actuation means (38), providing an integral unit which rotates together with the spindle (19) during machining. During jaw adjustment, an electromagnetic brake (28) releasably connects the motor station (24) with the spindle and chuck body. Gripping force adjustment is achieved by adjusting the motor torque. The internal forces of the rotating components are overcome by controlling the motor torque and velocity as gripping ensues, and therefore both high and low gripping forces may be accurately achieved with high speed jaw adjustment. Jaw position and workpiece diameter measurement with a feedback capability are made by means of a rotary encoder (11).
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Inventors:
LYACHOVITSKY NAUM
Application Number:
PCT/IL1999/000185
Publication Date:
November 18, 1999
Filing Date:
March 30, 1999
Export Citation:
Assignee:
N T NAUM TECHNOLOGIES LTD (IL)
International Classes:
B23B31/28; B23B31/16; (IPC1-7): B23B31/16
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