MULTISPINDLE HEAD NUMERICALLY CONTROLLED SPECIAL PURPOSE MACHINE TOOL

摘要

PURPOSE:To make it possible to simultaneously machine many holes or to tap them just after drilling process by providing a mechanism for threadedly-feeding in the axial direction on one of plural tool holding rotary shafts rotated followingly after a driven main shaft through gears. CONSTITUTION:The movement of a gear 26 along a main shaft 13 causes a tool holding rotary shaft 25 to perform clutch action. Another tool holding rotary shaft 15 is formed so that its gear 24 may constantly mesh the gear 26 of the main shaft 13 even if the above-mentioned clutch action moves the gear 26. Thus when the main shaft 13 rotates, the gear 26 meshes a gear 36 in a state of the clutch kept in its engagement to rotate a cylindrical body 33, and the tool holding rotary shaft 25 is therefore rotated through a spline shaft 25b engaging with a slot 33b of the body 33, and an external thread part 25a threadedly advances through a threaded hole 32a of a bush 32. A position control device 39 can thereby control the forward and backward positions of the bush 32 to make the tool holding rotary shaft 25 execute tapping work having simultaneous rotation and thread-feed. On the other hand, since the tool holding rotary shaft 15 functions only for rotation, it can be used for drilling work or the like.