Slide lock apparatus for press machine

A slide lock apparatus for a press machine that locks a shaft member that rotates together with raising and lowering operation of a slide that is supported on a main frame of the press machine, so that the shaft member cannot rotate, comprising:

• a flange member fixed over an exterior of the shaft member so as to be incapable of rotation with respect thereto, and having a flange portion that is parallel to a plane orthogonal to an axis of the shaft member;
• an annular main member fitted over the exterior of the shaft member and fixed to the main frame, and having an annular member that opposes the flange portion from a side of the main frame;
• a plurality of pin members, respectively shiftably installed in a plurality of reception holes that are formed in the annular member parallel to the axis of the shaft member;
• a plurality of actuators for driving the plurality of pin members between a retracted position in which the plurality of pin members are held in the reception holes and an advanced position in which predetermined end side portions are advanced out from the plurality of reception holes;
• a plurality of receiving holes receiving the predetermined end side portions of the plurality of pin members when the plurality of pin members are in their advanced positions, formed in the flange portion with setting spaces between them in a circumferential direction, and shaped as circular arcs in cross section with an arc length in the circumferential direction being greater than a diameter of the plurality of pin members;
• a plurality of locking engagement portions formed respectively at end portions of the plurality of pin members;
• an annular first locking member capable of locking the plurality of pin members in their retracted positions via a plurality of first locking portions that are capable of engaging and disengaging with the plurality of locking engagement portions of the plurality of pin members from the circumferential direction respectively, when the plurality of pin members are in their retracted positions;
• a first drive means capable of rotationally driving the annular first locking member around the axis of the shaft member between a locking position in which the annular first looking member locks the plurality of pin members in their retracted positions, and an unlocking position;
• an annular second locking member capable of locking the plurality of pin members in their advanced positions via a plurality of second locking portions that are capable of engaging and disengaging with the plurality of locking engagement portions of the plurality of pin members from the circumferential direction respectively, when the plurality of pin members are in their advanced positions;
• and
• a second drive means capable of rotationally driving the annular second locking member around the axis of the shaft member between a locking position in which the annular second locking member locks the plurality of pin members in their advanced positions, and an unlocking position.