US 12,263,551 B2
Rotary shaft locking device, machining head, and multi-tasking machine
Shinya Nakamura, Niwa-gun (JP); Hiroto Sasaki, Niwa-gun (JP); and Kimihiko Sato, Niwa-gun (JP)
Assigned to YAMAZAKI MAZAK CORPORATION, Niwa-gun (JP)
Filed by Yamazaki Mazak Corporation, Niwa-gun (JP)
Filed on May 15, 2023, as Appl. No. 18/317,096.
Application 18/317,096 is a continuation of application No. PCT/JP2020/048836, filed on Dec. 25, 2020.
Prior Publication US 2023/0286089 A1, Sep. 14, 2023
Int. Cl. B23Q 1/70 (2006.01); B23Q 5/04 (2006.01); F16C 19/18 (2006.01)
CPC B23Q 1/70 (2013.01) [B23Q 5/04 (2013.01); F16C 19/181 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotary shaft locking device comprising:
a rotary shaft which is rotatable about a first axis and which has a first contact surface and a mounting portion on which a tool is configured to be mounted;
a first angular contact ball bearing comprising:
an inner ring connected to the rotary shaft to surround the rotary shaft around the first axis such that the inner ring is rotatable together with the rotary shaft around the first axis;
an outer ring provided opposite to the inner ring to surround the inner ring around the first axis; and
a plurality of balls disposed between the inner ring and the outer ring such that the outer ring supports the inner ring via the plurality of balls and such that the inner ring and the outer ring are relatively rotatable around the first axis;
a support to which the outer ring is connected and which rotatably supports the rotary shaft via the first angular contact ball bearing, the support having a second contact surface which is configured to contact the first contact surface to prohibit the rotary shaft from rotating; and
an actuator configured to move the rotary shaft and the inner ring with respect to the support and the outer ring in a first direction parallel to the first axis so that the first contact surface contacts the second contact surface and so that precompression that acts on the plurality of balls is reduced.