Turret device

A turret device comprising:

• a shaft unit, the shaft unit being non-rotatable and having at least one supporting part with an outer peripheral surface of a cylindrical shape;
• and
• an outer cylinder unit comprising a hollow polygonal prismatic body having openings at opposing ends thereof, the outer cylinder unit having, at least on each planar surface of an outer periphery thereof, a respective attachment surface for attaching a tool thereto,
• wherein:
• the outer cylinder unit has at least one supported part having a corresponding inner peripheral surface of a cylindrical shape, and the outer cylinder unit is rotatably supported by the shaft unit with the at least one supported part externally fitted on the at least one supporting part of the shaft unit which is inserted through a first one of the openings;
• the turret device is configured to index each of the attachment surfaces formed on the outer peripheral surface of the outer cylinder unit into a predetermined machining position;
• the outer cylinder unit has, on a side of a second one of the openings, a housing space having a corresponding inner peripheral surface of a cylindrical shape and further has a coolant discharge flow path opened as a connection port in the inner peripheral surface of the housing space;
• the connection port being formed at a predetermined pitch interval in a circumferential direction in correspondence with the attachment surfaces;
• a coolant supply mechanism arranged on an end of the shaft unit is disposed in the housing space of the outer cylinder unit, and the second one of the openings of the outer cylinder unit is closed by a lid;
• the coolant supply mechanism includes:
• a reciprocating rod disposed along a radial direction of the outer cylinder unit and configured to advance and retract with respect to the inner peripheral surface of the housing space;
• and
• a shaft receiving unit supporting the reciprocating rod in such a manner as to allow the reciprocating rod to advance and retract, the shaft receiving unit including a drive unit configured to advance and retract the reciprocating rod;
• the drive unit includes:
• a piston externally fitted onto the reciprocating rod;
• a pressure chamber formed in the shaft receiving unit;
• and
• by supplying pressure fluid into the pressure chamber on a front side of the piston in an advancing and retracting direction, the reciprocating rod is retracted from the inner peripheral surface of the housing space;
• the reciprocating rod has a supply hole bored along an axis of the reciprocating rod and opened in a distal end of the reciprocating rod, and the reciprocating rod has an annular elastic body arranged on the distal end thereof to surround the supply hole;
• and
• when the reciprocating rod is advanced, the elastic body comes into contact with the inner peripheral surface of the housing space to surround the connection port formed in the inner peripheral surface of the housing space.