Abstract: Disclosed herein is a workpiece holding device including: a plurality of first claw portions capable of linearly moving in a direction parallel to a predetermined plane; a second claw portion and a third claw portion disposed to face each other in a direction orthogonal to the predetermined plane; and a motion conversion mechanism portion that converts a linear motion associated with movement of the first claw portion into a linear motion in the direction orthogonal to the predetermined plane, transmits the linear motion to the second claw portion. The first claw portion, the second claw portion, and the third claw portion each have a grasping surface to abut against a workpiece to be held, and the grasping surface of the first claw portion is different in shape from the grasping surfaces of the second claw portion and the third claw portion.

Abstract: A workpiece attachment/removal device includes a guide mechanism disposed along an X-axis before a table, first and second placement tables disposed at right and left sides of the table behind the guide mechanism, and a transfer mechanism moving along the X-axis while being guided by the guide mechanism. The transfer mechanism includes a base engaged with the guide mechanism and moving along the X-axis, a linear drive part moving the base along the X-axis, a pair of clamping arms having tip ends positioned at the table side, a clamping drive part opening and closing the clamping arms, and a turning drive part turning the clamping arms to move the tip ends of the clamping arms between a lower position and an upper position.

Abstract: Provided is a workpiece attachment/removal device which enables an overall size including a machine tool to be more compact than conventional ones and does not influence machining time. The workpiece attachment/removal device includes a guide mechanism (11) disposed along an X-axis before a table, first and second placement tables (40, 50) disposed at right and left sides of the table behind the guide mechanism (11), and a transfer mechanism (20, 30) moving along the X-axis while being guided by the guide mechanism (11). The transfer mechanism (20, 30) includes a base engaged with the guide mechanism (11) and moving along the X-axis, a linear drive part moving the base along the X-axis, a pair of clamping arms having tip ends positioned at the table (6) side, a clamping drive part opening and closing the clamping arms, and a turning drive part turning the clamping arms to move the tip ends of the clamping arms between a lower position and an upper position.