Tool replacement apparatus

A tool changing device for detaching a previously-used tool as one among a plurality of tools from a spindle of a machine tool and attaching a subsequently-used tool as a tool different from the previously-used tool to the spindle, the tool changing device comprising:

• an arm including a grip member that is rotatable to a grip angle for gripping the tool and to a release angle for releasing the gripping of the tool, the arm being configured to allow the grip member to detach the previously-used tool from the spindle and attach the subsequently-used tool to the spindle;
• and
• a grip interlocking mechanism that rotates the grip member in conjunction with a movement of the arm relative to the spindle,
• wherein the grip interlocking mechanism includes a spindle-side cam, an arm roller that is attached to the grip member and moves relative to the spindle-side cam together with the arm, a separation cam that is provided at a position further away from the spindle than the spindle-side cam, and a separation roller that is attached to the grip member and moves relative to the separation cam together with the arm,
• when the arm moves relative to the spindle in a predetermined direction to a predetermined position, the arm roller is displaced according to a profile of the spindle-side cam to rotate the grip member toward the release angle, and
• when the arm further moves relative to the spindle in the predetermined direction from the predetermined position, the separation roller is displaced according to a profile of the separation cam to further rotate the grip member toward the release angle such that the arm roller is separated from the spindle-side cam.