TIMEPIECE MOVEMENT AND TIMEPIECE
FIG16 is an enlarged view illustrating a meshing portion between an indicating hand gear and a second intermediate pinion in a train wheel according to a second embodiment
FIG16 is an enlarged view illustrating a meshing portion between an indicating hand gear and a second intermediate pinion in a train wheel according to a second embodiment. The second embodiment illustrated in FIG16 is different from the first embodiment in that a pair of teeth 50 adjacent to each other in a plurality of teeth 50 belonging to an indicating hand gear 133a is an elastic tooth 152. As illustrated in FIG16, the elastic tooth 152 increases the load received by the rotor 202 when the indicating hand 40 is located at the reference position, which is the above-described reference load unit. The elastic tooth 152 is provided with an elastic portion 156 which is elastically deformable and a rigid body 157 which is not elastically deformable. Each of the pair of elastic teeth 152 includes first tooth surfaces 153 (facing tooth surfaces) facing each other in the circumferential direction of the indicating hand gear 133a and second tooth surfaces 154 facing sides opposite to the first tooth surfaces 153. The first tooth surface 153 is formed from the elastic portion 156. The second tooth surface 154 is formed from the rigid body 157. A slit 159 extending inward in the radial direction from the vicinity of the tooth tip of the elastic tooth 152 is formed between the elastic portion 156 and the rigid body 157.
enlarged view
157
rigid body
30
train wheel
154
156
elastic portion elastic portions
153
first tooth surface first tooth surfaces
159
slit
152
elastic teeth elastic tooth
162
tooth groove
161
tooth groove
['1. A timepiece movement (1) comprising: a stepping motor (20) that has a rotor (202) for rotating an indicating hand (40); a control unit (10) to rotate the rotor by using a main drive pulse (P1) and an auxiliary drive pulse (P2), and to determine a reference position of the indicating hand by detecting a rotation state of the rotor when the indicating hand is rotated by using a detection drive pulse based on the main drive pulse; a train wheel (30) to transmit a drive force of the stepping motor to the indicating hand, and that has a first gear (33) and a second gear (32) which mesh with each other; and an elastic portion (56) that is disposed in the first gear, and that is elastically deformed by coming into contact with the second gear when the indicating hand is located at the reference position, wherein the first gear includes an elastic tooth (52) which is a tooth belonging to the first gear, and which has a first tooth surface (53) facing an upstream side in a first rotation direction of the first gear and a second tooth surface (54) facing a downstream side in the first rotation direction, wherein one of the first tooth surface and the second tooth surface is formed from the elastic portion, and characterized in that  the other one of the first tooth surface and the second tooth surface is formed from a rigid body.', '3. The timepiece movement according to claim 1, wherein the first gear includes a pair of elastic teeth (152) belonging to the first gear and adjacent to each other, wherein a width of a tooth groove (161) between the pair of elastic teeth is smaller than a tooth thickness of the tooth (32c) belonging to the second gear, wherein the respective pair of elastic teeth have facing tooth surfaces (153) which face each other in a circumferential direction, and wherein the facing tooth surfaces are formed from the elastic portion.']