| 摘要 |
PROBLEM TO BE SOLVED: To provide a balance adjustment device capable of easily adjusting a posture difference, balance with hairspring, speed governor, movement, and timepiece.SOLUTION: A balance adjustment device 70 is provided on a balance wheel 21 fixed to a balance staff 20, and is movable about a central axis O of the balance staff 20 in the circumferential direction of the balance wheel 21. The balance 15 with a hairspring includes: the balance staff 20 supported rotatably about the central axis O; the balance wheel 21 fixed to the balance staff 20 and having an annular part 23 coaxial with the central axis O; and a balance adjustment device 70 movable about the central axis O in the circumferential direction of the annular part 23. The balance adjustment device 70 includes two first balance adjustment parts 71 that clamp the balance wheel 21 and are slidably provided in the circumferential direction with respect to the balance wheel 21, and a second balance adjustment part 76 that is formed integrally with the balance wheel 21 and causes a centroid position of the balance wheel 21 to be eccentrically positioned with respect to the central axis O.SELECTED DRAWING: Figure 5 |
