PURPOSE: To save the installation space of the machine tool in the headline and to reduce its cost, by a method wherein the function of a chuck claw exchanging device is combined with that of a feeder for a workpiece.
CONSTITUTION: A lathe body 1 is provided with a chuck 2, a claw inserting removing device 4, and a rotary feeder 5 which is available for both the function of a claw 3 and feed ejection of a workpiece. The claw inserting removing device 4 causes the position of the claw 3 to correctly match with the position of the claw engaging groove in the chuck, and pushes the claw 3 in the groove to secure it therein, thus completing operation to insert the claw. The above operation is effected only the number of times equivalent to that of the claws. When a given processing is completed and a claw ejecting instruction is issued, the claw 3 mounted to the chuck is ejected to a stowing device 6 in reverse order to that of operation to feed the claw and the ejecting work is completed.
KANEKO SATORU
NIWA TOSHIKAZU
IKEDA MITSUO
