| 摘要 |
PURPOSE:To simplify a cutting feed control mechanism, located on the body side, and to save energy, by a method wherein a differential mechanism is mounted as a planetary gear mechanism not in a main shaft head but in a tool holding device. CONSTITUTION:A gear 26, locked to a main shaft head 1 through a fixed case 27 by means of a locking mechanism 29, is checked in its rotation through the effect of a planetary gear mechanism consisting of small gears 24, 25, a slide gear 20, and the gear 26. Thus, the slide gear 20 is also checked in its rotation, and the moving distance in a radial direction of the slider 14, i.e., the cutting depth in a radial direction of a rotary tool may be controlled rectilinearly and proportionally over a whole movement range in relation to rotation of a servo motor 24, through proper selection of pitch of a ball screw 17 and taper of a conical part 19. |
