Cutting edge adjustment device, rotary member applied to the device, and tool body, cartridge, and cutting insert having structures suitable for the device

A cutting edge adjustment device for a cutting tool for adjusting the position of a cutting edge of a cutting insert by causing movement of the cutting insert, the cutting edge adjustment device comprising:

• at least one rotary member for producing the movement;
• wherein the rotary member is formed into a shape in which at least one substantially cylindrical portion having an outer peripheral surface whose radius is constant and at least one cam portion having a cam face whose radius is gradually increased in a manner corresponding to the amount of the movement are arranged in a direction of a rotational center axis,
• wherein the cutting insert is directly or indirectly pressed against the rotary member by the action of the cam face according to the rotation of the rotary member on the rotational center axis, so as to adjust the position of the cutting edge;
• wherein at least one pressing member is interposed between the rotary member and the cutting insert,
• the cutting insert being pressed by the rotary member via the pressing member, and
• the pressing member having the portion that abuts against the rotary member.

A cutting edge adjustment device comprising, in combination;

• a rotary member having a rotational center axis (O) and comprising a substantially cylindrical portion and a cam portion having a cam face whose radius gradually increases in a circumferential direction, the substantially cylindrical portion and the cam portion being arranged along the rotational center axis (O);
• and
• a cartridge having an insert seat formed at a first end, a rotary member holding portion formed at a second end, and a fixing hole located between the first and second ends;
• wherein:
• at the second end, the cartridge's rotary member holding portion comprises a concave abutment surface and a concave curved surface, the concave curved surface being recessed inward of the cartridge relative to the concave abutment surface;
• the cartridge's rotary member holding portion is configured to receive the rotary member, with the cam face of the rotary member opposing the concave curved surface, and the substantially cylindrical portion of the rotary member opposing the concave abutment surface of the cartridge's rotary member holding portion.