PURPOSE: To improve the accuracy in correcting the turning of a C shaft based on the rotation of a T shaft by providing a C shaft correction driving mechanism to be driven by the motor for a turret and cancelling the turning of the C shaft caused by a T command by a differential gear mechanism as well.
CONSTITUTION: The differential gear 3 for correcting the direction of a die independently and a C shaft correction driving mechanism 4 are arranged for the motor 1 for a turret rotating upper and lower turrets 13, 14 by a T command. At the time when the motor 1 for turret is rotated by the T command the differential gear 3 is driven via the C shaft correction driving mechanism 4 and the rotation there of rotates gear mechanisms 7, 9 via the C shaft correction driving mechanism 4. The differential gear 3 is thus moved so as to cancel the rotation of the gear mechanisms 8, 10 formed by the turret rotation with the operation of the C shaft correction driving mechanism 4. Consequently the rotation correction accuracy of the C shaft is improved.
ISONO KOICHI
OKA HIROCHIKA
NEC ROBOTICS ENG LTD
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