公开(公告)号：US11376667B2

公开(公告)日：2022-07-05

申请号：US16887355

申请日：2018-12-21

Applicant: STAR MICRONICS CO., LTD.

Inventor： Norio Kaku

IPC: B23B25/06 ,  B23B13/12 ,  B23Q17/20

Abstract: A machine tool improving measurement accuracy of a machined workpiece diameter. A machine tool comprises a displacement sensor mounted on at least one of a guide bush and a spindle supporting unit. The machine tool further comprises a calculating unit which calculates a diameter of the machined workpiece based on a measurement value of the machined workpiece by the displacement sensor. The spindle is movable back and forth in an axial direction. The spindle is retracted after machining to bring a machined portion of the workpiece to a predetermined measurement position in the axial direction to allow the displacement sensor to measure the machined portion.

公开(公告)号：US11491555B2

公开(公告)日：2022-11-08

申请号：US16887322

申请日：2020-05-29

Applicant: STAR MICRONICS CO., LTD.

Inventor： Norio Kaku

IPC: B23B31/26 ,  B23B31/20

Abstract: Provided is a lathe capable of elongating the life of a shifter mechanism. A lathe comprises a spindle, a chucking unit, a power transmitting unit, a shifter, a claw, and a driving unit. The shape of an outer circumference of the shifter in a contact range and a first end of the claw in longitudinal section along the spindle axis is such shape as the acceleration “a” of the first end in the diameter direction with respect to the moving distance of the shifter moving in the direction of the spindle axis (Z-axis direction) at a constant speed is continuous both in a positive range and in a negative range where the contact range is a range of the outer circumference of the shifter in contact with the first end of the claw.