Abstract: A chuck-claw guide structure includes a guide-space delimiting part that delimits a guide space in communication with an attachment groove, and a regulation part provided on the guide-space delimiting part. The guide-space delimiting part has a contact surface configured to regulate the claw in contact therewith at a position along the attachment groove in a first direction. The regulation part is configured to regulate the claw at a position along the attachment groove in a second direction different from the first direction.

Abstract: A chuck grip accuracy checking method includes a gripping in which the measurement target is gripped on the claws, a moving step, and a measuring step. In the moving step, a movable member provided with a measurement instrument capable of measuring a run-out of the measurement target is moved by driving a movable-member driver to a position at which the measurement instrument can measure a run-out of the measurement target. In the measuring step, a run-out of the measurement target is measured by the measurement instrument, while the chuck is being rotated by driving a rotation driver.

Abstract: A chuck-claw coupling mechanism includes a coupling member provided in a master jaw, a first resilient member, and an operation unit. The coupling member is movable between a coupling position at which the coupling member is coupled to the claw, and a separation position at which the coupling member is separated from the claw. The first resilient member urges the coupling member toward the coupling position. The operation unit moves the coupling member to the separation position.

Abstract: A dust-proof mechanism for chuck includes a fluid supply source, an inner space inside a chuck, and a discharge space in the chuck. A supply fluid is supplied to the inner space from the fluid supply source, and passes through the inner space as a pressurized fluid. Through the discharge space, the pressurized fluid is discharged to the outside of the chuck from the inner space.

Abstract: A chuck-claw guide structure includes a guide-space delimiting part that delimits a guide space in communication with an attachment groove, and a regulation part provided on the guide-space delimiting part. The guide-space delimiting part has a contact surface configured to regulate the claw in contact therewith at a position along the attachment groove in a first direction. The regulation part is configured to regulate the claw at a position along the attachment groove in a second direction different from the first direction.

Abstract: A chuck-claw coupling mechanism includes a coupling member provided in a master jaw, a first resilient member, and an operation unit. The coupling member is movable between a coupling position at which the coupling member is coupled to the claw, and a separation position at which the coupling member is separated from the claw. The first resilient member urges the coupling member toward the coupling position. The operation unit moves the coupling member to the separation position.

Abstract: A chuck grip accuracy checking method includes a gripping in which the measurement target is gripped on the claws, a moving step, and a measuring step. In the moving step, a movable member provided with a measurement instrument capable of measuring a run-out of the measurement target is moved by driving a movable-member driver to a position at which the measurement instrument can measure a run-out of the measurement target. In the measuring step, a run-out of the measurement target is measured by the measurement instrument, while the chuck is being rotated by driving a rotation driver.

Abstract: A sealing part disposed between a claw opening-and-closing member and a support member. The sealing part includes a first contact part that is in contact with the claw opening-and-closing member, and a second contact part that is in contact with the claw opening-and-closing member at a position different from that of the first contact part.

Abstract: A hand for exchanging claws of a chuck is configured to be fitted to a transfer device so as to attach and detach a claw to and from a fitting groove provided in the chuck of a machine tool. The hand for exchanging claws includes: a hand part capable of grasping the claw; and a compliance device that fits the hand part to the transfer device, and allows relative displacement between the transfer device and the hand part.

Abstract: A creel device for a drawing frame, having a drive train for lifting rollers for taking out slivers from respective cans. In one embodiment, the cans are divided into two groups each constructed at consecutively located cans. The drive train is divided into two sections for driving respective lifting rollers for respective groups of cans. The basic section is for driving lifting rollers for the group adjacent the draft part, and the second section is for driving lifting rollers from the group remote from the drafting part. The first section is connected to a rotating movement source in the machine frame, while the second section is connected to a variable speed motor.