Lathe with chuck

A lathe comprising:

• a spindle rotatable on a spindle axis and provided with a chuck having a closed state to hold a workpiece and an opened state to release the workpiece;
• and
• a chuck operating apparatus which opens and closes the chuck, comprising:
• a tilt claw provided outside the spindle and having a first posture to bring the chuck into the opened state and a second posture to bring the chuck into the closed state;
• and
• a shifter provided outside the spindle and movable in a direction of the spindle axis to be brought in a first position to bring the claw into the first posture and in a second position to bring the claw into the second posture,
• wherein a roller is mounted on the shifter in a contact position with the claw to roll in the direction of the spindle axis,
• wherein, in a state that the claw is in the first posture, the shifter in its entirety is located within the claw in the direction of the spindle axis,
• wherein the claw includes a root having an insertion hole into which a claw pin is inserted, a movable end, and a recess and a groove located between the root and the movable end, and
• wherein
• the recess and the groove are distinguished by a protrusion therebetween,
• the groove is located between the recess and the movable end, and is narrower than the recess in the direction of the spindle axis, and
• the shifter is located within the recess and the groove in the first posture, and at least a portion of the shifter is located on the movable end in the second posture.