Patent ID: 11919095
Assignee: STAR MICRONICS CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 0:
1. A lathe comprising:
a spindle rotatable on a spindle axis,
a spindle support which supports the spindle through a bearing on an outer side of the spindle with respect to the spindle axis and includes an air passage extending along a direction of the spindle axis,
a collet disposed on a front end of the spindle,
an inner ring holder provided on the spindle to hold a front of an inner ring of the bearing,
an outer ring holder provided on the spindle support to hold a front of an outer ring of the bearing on an outer side of the inner ring holder with respect to the spindle axis,
a cap screwed into the spindle in front of the inner ring holder and disposed on an outer side of the collet with respect to the spindle axis,
a cover detachably provided on the spindle support side, the cover having an inner circumferential surface facing an outer circumferential surface of the cap, and
a first air purging unit provided between the inner circumferential surface of the cover and the outer circumferential surface of the cap, the first air purging unit being supplied with purge air through the air passage,
wherein the air passage extends from a back side of the bearing toward the front end of the spindle, and the purge air flows toward the front end of the spindle from the back side of the bearing and passes between the inner circumferential surface of the cover and the outer circumferential surface of the cap.