| 摘要 |
PROBLEM TO BE SOLVED: To support a workpiece by a single operation by numerically controlling a tailstock of a combined working lathe. SOLUTION: The tailstock 30 of the combined working lathe is screwed with a ball screw 200 via a ball nut 32. A tailstock drive 100 has a servo motor 110 and transmits turning force to the ball screw 200 via a coupling member 140 and a joint member 150. A coil spring 210 is provided in the joint member 150 for supporting the ball screw 200 movably in the direction of an arrow F<SB>1</SB>. When the tailstock 30 is to be used, a command is given to the servo motor 110 to move the tailstock 30 in the direction of an arrow A. When a center shaft 36 is pressed against a center hole 22 of the workpiece 20, the tailstock 30 stops advancing. A set current is fed to the servo motor 110, and the coil spring 210 contracts to cause spring force P1. A brake 220 is activated to shut off the power supply to the servo motor 110. COPYRIGHT: (C)2005,JPO&NCIPI
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