Patent ID: 6954330

Claim:
A disk chuck which accommodates disks, comprising: a hollow main shaft which seats and receives the disks so as to have the disks fitted over the hollow main shaft; a piston which is received in the hollow main shaft and axially moves in the hollow main shaft in opposite directions; and a clamping shaft which is axially received in the hollow main shaft, coupled to the piston and moves along with the piston in the same direction so as to clamp and unclamp the disks, wherein an upper end of the clamping shaft is projected from the hollow main shaft and includes a disk clamping part which selectively clamps and unclamps the disks seated on the hollow main shaft, wherein: the disk clamping part includes a skirt part; and the disk clamping part further comprises slits which are formed on the skirt part in a radial direction and allow the outer diameter of the skirt part to be changeable.