Variation reduction mechanism of stop position of pointer
AssigneeCitizen Watch Co., Ltd.
InventorsKazuya Imamura, Shoichiro Morita
Life of this patent
Estimating the term…
Abstract
A variation reduction mechanism of a stop position of a pointer includes a return gear that is driven in conjunction with a time display mechanism, a slip torque spring (friction member) that contacts the return gear to apply a friction force to the return gear to be driven, and a return spring (return spring member) that applies, to the slip torque spring, a torque of the return gear in a direction (dashed line arrow—R direction) opposite to a normal hand movement direction (arrow R direction).
Claims14
A variation reduction mechanism of a stop position of a pointer, the variation reduction mechanism comprising:
- a return gear that is driven in conjunction with a time display mechanism;
- a friction member that contacts the return gear to apply a normal force orthogonal to a planar surface of the return gear to be driven;
- and
- a return spring member that applies, to the friction member, a torque of the return gear in a direction opposite to a normal hand movement direction for displaying a time,
- wherein a tooth of the return gear presses a tooth of a gear engaging with the return gear to an end portion in the direction opposite to the normal hand movement direction in a backlash of the tooth of the gear engaging with the return gear, and
- wherein the normal force yields a friction force that resists rotation of the return gear.
A variation reduction mechanism of a stop position of a pointer, the variation reduction mechanism comprising:
- a return gear that is driven in conjunction with a time display mechanism;
- a friction member that contacts a planar surface of the return gear to apply a friction force along the planar surface of the return gear to be driven;
- and
- a return spring member that applies, to the friction member, a torque of the return gear in a direction opposite to a normal hand movement direction for displaying a time,
- wherein the friction member comprises a central portion and a plurality of arms extending radially outward from the central portion, wherein a contact portion is provided on each of the plurality of arms.
Dependencies are inferred from the claim text.