Chuck device

A chuck device comprising:

• a chuck main body;
• an exchange structure that is disposed to be exchangeable in the chuck main body;
• an axial direction regulating mechanism that has a circumferential groove section which is recessed into one of the chuck main body and the exchange structure and extends in the circumferential direction, and a radially protruding section which is disposed in the other of the chuck main body and the exchange structure and is to protrude in the radial direction, and the axial direction regulating mechanism regulates rattling of the exchange structure in the axial direction with respect to the chuck main body by causing the exchange structure to abut with the chuck main body from the axial direction and inserting the radially protruding section into the circumferential groove section;
• and
• a circumferential direction regulating mechanism that has an axially recessed section which is disposed in one of the chuck main body and the exchange structure, and is recessed in the axial direction, and an axially protruding section, which is disposed in the other of the chuck main body and the exchange structure and is to protrude in the axial direction, the axially protruding section being movable in the axial direction relative to the chuck main body and the exchange structure when the axially protruding section is disposed in the axially recessed section, and the circumferential direction regulating mechanism regulates rattling of the exchange structure in the circumferential direction with respect to the chuck main body by causing the exchange structure to rotate by a predetermined angle in the circumferential direction and causing the radially protruding section to slide in the circumferential groove section and inserting the axially protruding section into the axially recessed section in a state in which rattling of the exchange structure in the axial direction with respect to the chuck main body is regulated by the axial direction regulating mechanism
• wherein the chuck main body has an axial end face and an outer circumferential surface,
• the exchange structure has a bottom face that faces the axial end face and an inner circumferential surface that faces the outer circumferential surface, and the exchange structure is a bottomed tube that opens toward the chuck main body,
• the axial direction regulating mechanism has the circumferential groove section that is recessed in the outer circumferential surface of the chuck main body and the radially protruding section that is to protrude from the inner circumferential surface of the exchange structure to the radially inner side, and
• the circumferential direction regulating mechanism has the axially recessed section that is recessed in the axial end face of the chuck main body and the axially protruding section that is to protrude from the bottom face of the exchange structure in the axial direction.