TOOL HOLDER CLAMP DEVICE FOR SPINDLE

摘要

PROBLEM TO BE SOLVED: To provide a screw fastening type tool holder clamp device capable of corresponding to an automatic tool exchange device. SOLUTION: A clamp bolt member 23 having a screw part 25 to screw in a screw hole H formed in the axial direction on a shank part S of a tool holder T and to fix the tool holder T by fastening of the shank part S by the screw part 25 is provided free to rotate in a central through hole 19 of a spindle 1 communicated to a taper hole 9 and free to move in the axial direction, and a driveshaft body 29 to rotate and drive the clamp bolt member 23 is provided free to rotate in the central through hole 19 of the spindle 1 and free to move in the axial direction, and it is engaged with the clamp bolt member 23 in a driving connected state by movement in the axial direction. This driving connection is carried out by spline connection with a spline hole 35 provided on the side of the driveshaft body 29 and a spline shaft body 27 provided on the clamp bolt member 23.