Patent Description:
A mechanical timepiece in related art is provided with a train wheel setting mechanism that stops a second hand when adjusting time (for example, see <CIT>). <CIT> discloses a configuration in which a balance setting lever for setting rotation of a balance with hairspring is provided so as to rotate based on rotation of a setting lever in a state where a second hand of a winding stem can be adjusted.

When a train wheel setting lever is disposed on a main plate by being supported by a pin fixed to the main plate, a part of a space on the main plate is occupied by the train wheel setting lever. Therefore, in order to avoid interference between parts, it is necessary to devise shapes of parts other than the train wheel setting lever, which reduces a design margin. This is more remarkable as a timepiece movement is smaller. Therefore, there is room for improvement in that in a train wheel setting mechanism in related art, reduction of the design margin of the timepiece movement is prevented. <CIT> discloses a control device for setting the hands of a watch, and more specifically, a stop mechanism to lock the watch's balance wheel during the adjustment of the hands.

It is an aspect of the present application to provide a train wheel setting mechanism capable of preventing reduction in a design margin of a timepiece movement, a timepiece movement including the train wheel setting mechanism, and a timepiece.

A train wheel setting mechanism of the application is set out in the appended claims.

According to the application, the train wheel setting lever can be incorporated into a timepiece movement without providing a pin or the like for supporting the train wheel setting lever on the main plate. As a result, a degree of freedom in shapes of parts other than the train wheel setting lever is improved. Therefore, the train wheel setting mechanism capable of preventing reduction in a design margin of the timepiece movement can be provided.

In the train wheel setting mechanism described above, the second rotating body is a center wheel and pinion to which a minute hand is attached.

According to the application, the bridge member is disposed closer to the main plate than another bridge member that supports a rotating body to which a second hand is attached together with the main plate. Therefore, the bridge member is disposed closer to the winding stem than the other bridge member in a thickness direction of the main plate. Therefore, it becomes possible to easily design the configuration for operating the train wheel setting lever in conjunction with the winding stem.

In the train wheel setting mechanism described above, a biasing member configured to bias the train wheel setting lever with respect to the bridge member is provided.

According to the application, the train wheel setting lever is pressed in one direction by the biasing member, so that rattling of the train wheel setting lever can be reduced and operations of the train wheel setting lever can be stabilized.

In the train wheel setting mechanism described above, the bridge member may be formed with a recess portion in which the train wheel setting lever and the biasing member are accommodated.

According to the application, a volume of a space occupied by the train wheel setting lever and the biasing member around the recess portion can be reduced as compared with a configuration in which the recess portion is not formed in the bridge member. As a result, a degree of freedom in shapes of parts other than the train wheel setting lever and the biasing member can be further improved.

In the train wheel setting mechanism described above, the biasing member may be provided integrally with the train wheel setting lever.

According to the application, the number of parts can be reduced as compared with a configuration in which the biasing member is provided as a member separate from the train wheel setting lever. As a result, a manufacturing cost can be reduced.

In the train wheel setting mechanism described above, the train wheel setting lever may include: a lever body that is supported by the bridge member; an abutting portion that is supported by the lever body and abuts against the winding stem by a biasing force of the biasing member; and a contacting portion that is supported by the lever body and is capable of coming into contact with the first rotating body.

According to the application, by displacing the winding stem in an axial direction, the abutting portion can be displaced together with the lever body according to a shape of the winding stem. As a result, the contacting portion supported by the lever body can come into contact with and be separated from the first rotating body. Therefore, the train wheel setting lever can be operated in conjunction with the winding stem.

In the train wheel setting mechanism described above, an interlocking portion that displaces in conjunction with displacement in an axial direction of the winding stem is included, and the train wheel setting lever may include: a lever body that is supported by the bridge member; an engaging portion that is supported by the lever body and is capable of engaging with the interlocking portion; and a contacting portion that is supported by the lever body and is capable of coming into contact with the first rotating body.

According to the application, by displacing the winding stem in the axial direction, the engaging portion can be displaced together with the lever body as the interlocking portion is displaced. As a result, the contacting portion supported by the lever body can come into contact with and be separated from the first rotating body. Therefore, the train wheel setting lever can be operated in conjunction with the winding stem.

In the train wheel setting mechanism described above, the train wheel setting lever may include an elastically deformable portion formed to be flexibly deformable.

According to the application, by flexibly deforming the elastically deformable portion, a contact pressure between the train wheel setting lever and the first rotating body can be reduced. Therefore, damage to the first rotating body from contact with the train wheel setting lever can be prevented.

Further, when the train wheel setting lever separates from the first rotating body, by restoration of the elastically deformable portion, the train wheel setting lever can flip the first rotating body and apply a rotational force to the first rotating body. As a result, an operation of the first rotating body can be promptly restarted.

In the train wheel setting mechanism described above, the train wheel setting lever may include the elastically deformable portion formed to be flexibly deformable, and the abutting portion abuts against the winding stem in a state in which the contacting portion is in contact with the first rotating body.

According to the application, since rotation of the lever body by the biasing member is restricted by contacting the abutting portion with the winding stem, only a restoring force due to flexible deformation of the elastically deformable portion can be applied to the first rotating body from the contacting portion. As a result, a contact pressure between the train wheel setting lever and the first rotating body can be reduced. Therefore, damage to the first rotating body from contact with the train wheel setting lever can be prevented.

In the train wheel setting mechanism described above, the train wheel setting lever is disposed on an opposite side of the main plate with the bridge member interposed therebetween.

According to the application, a space between the main plate and the bridge member can be prevented from being occupied by the train wheel setting lever. As a result, a degree of freedom in the shapes of the parts other than the train wheel setting lever, which are disposed between the main plate and the bridge member, can be improved.

In the train wheel setting mechanism described above, the train wheel setting lever may be disposed between the bridge member and the main plate.

According to the application, a space of the opposite side of the main plate with the bridge member interposed therebetween can be prevented from being occupied by the train wheel setting lever. As a result, a degree of freedom in shapes of parts other than the train wheel setting lever, which are disposed on the opposite side of the main plate with the bridge member interposed therebetween, can be improved.

A timepiece movement of the application includes the train wheel setting mechanism described above.

A timepiece of the application includes the timepiece movement described above.

According to the application, reduction in a design margin can be prevented. Therefore, the timepiece movement and the timepiece can be easily assembled and the manufacturing cost can be reduced. Further, a large number of parts can be disposed around the train wheel setting lever, and the multifunctional timepiece movement and the timepiece that have the large number of parts can be provided.

According to the application, a train wheel setting mechanism capable of preventing reduction in a design margin of a timepiece movement, a timepiece movement including the train wheel setting mechanism, and a timepiece can be provided.

Hereinafter, embodiments of the present invention will be described by way of example only with reference to drawings. In the following description, configurations having the same or similar functions are denoted by the same reference numerals. Repeated description of these components may be omitted.

The first embodiment will be described with reference to <FIG>.

<FIG> is a plan view of a timepiece of the first embodiment.

As shown in <FIG>, a timepiece <NUM> of the present embodiment includes: a timepiece case <NUM> with a case back (not shown) and a glass <NUM>, a movement <NUM> (timepiece movement), a dial <NUM> having indicators and the like, and an hour hand <NUM>, a minute hand <NUM>, and a second hand <NUM> that rotate around a central axis O to indicate the indicators on the dial <NUM>.

The movement <NUM> is disposed in the timepiece case <NUM> between the dial <NUM> and the case back. Hereinafter, in a direction along the central axis O, a side (a side where the dial <NUM> is located) of the timepiece case <NUM> where the glass <NUM> is located with respect to the movement <NUM> is referred to as a "back side" of the movement <NUM>. Further, in the direction along the central axis O, a side (a side opposite to the dial <NUM>) of the timepiece case <NUM> where the case back is located with respect to the movement <NUM> is referred to as a "front side" of the movement <NUM>. Further, the direction along the central axis O is referred to as a front-back direction.

<FIG> is a plan view of the movement according to the first embodiment as seen from the front side. <FIG> is a cross-sectional view taken along a line III-III in <FIG>.

As shown in <FIG> and <FIG>, the movement <NUM> mainly includes: a main plate <NUM>, a front train wheel <NUM> disposed on a front side of the main plate <NUM>, a back train wheel <NUM> disposed on a back side of the main plate <NUM>, a barrel and train wheel bridge <NUM> and a center wheel bridge <NUM> that support the front train wheel <NUM> together with the main plate <NUM>, an escapement governor mechanism <NUM> that controls rotation of the front train wheel <NUM>, and a train wheel setting mechanism <NUM> that sets a balance with hairspring <NUM>, which will be described later, of the escapement governor mechanism <NUM>.

As shown in <FIG>, the main plate <NUM> constitutes a substrate of the movement <NUM>. The main plate <NUM> is formed in a plate shape having a thickness in the front-back direction. The main plate <NUM> is disposed on a front side of the dial <NUM> (see <FIG>). The barrel and train wheel bridge <NUM> and the center wheel bridge <NUM> are disposed on the front side of the main plate <NUM>. The barrel and train wheel bridge <NUM> and the center wheel bridge <NUM> are separately fixed to the main plate <NUM>. The center wheel bridge <NUM> is disposed closer to the main plate <NUM> than the barrel and train wheel bridge <NUM>. The center wheel bridge <NUM> is formed so as to entirely overlap the main plate <NUM> when viewed from the front side. The center wheel bridge <NUM> is formed so that at least a part thereof overlaps with the barrel and train wheel bridge <NUM> when viewed from the front side. A detailed configuration of the center wheel bridge <NUM> will be described later.

<FIG> is a plan view of a part of the movement according to the first embodiment as seen from the front side.

As shown in <FIG>, a winding stem guide hole 10a is formed in the main plate <NUM>. A winding stem <NUM> is incorporated in the winding stem guide hole 10a. The winding stem <NUM> is supported by the main plate <NUM> so as to be rotatable and movable in an axial direction of the winding stem <NUM>. The winding stem <NUM> extends around an axis perpendicular to the central axis O. The winding stem <NUM> includes a cylindrical portion 13a extending in the axial direction of the winding stem <NUM> with a constant outer diameter, and a conical portion 13b that includes a tip end on a center side of the movement <NUM> and gradually decreases in diameter from the cylindrical portion 13a toward the center side of the movement <NUM>. Cross-sectional shapes of the cylindrical portion 13a and the conical portion 13b are circular shapes around a central axis of the winding stem <NUM>. A crown <NUM> is connected to the winding stem <NUM> on an outer side of the timepiece case <NUM> shown in <FIG>. The winding stem <NUM> is axially displaceable as the crown <NUM> is pulled out. The winding stem <NUM> is held at a predetermined position by a switching device described later. In the present embodiment, the winding stem <NUM> is held in at least two positions, that is, a zeroth-step position entering most inside the movement <NUM> and a first-step position in which the crown <NUM> is pulled by one step from the zeroth-step position. In addition, in <FIG>, the winding stem <NUM> is located at the zeroth-step position.

The switching device includes a setting lever and a yoke (not shown). The setting lever and the yoke are provided so as to be separately rotatable with respect to the main plate <NUM>. The setting lever engages with the winding stem <NUM> and rotates in conjunction with displacement in the axial direction of the winding stem <NUM>. The yoke is engaged with the setting lever and rotates with rotation of the setting lever. The setting lever and the yoke slide with each other as the winding stem <NUM> is displaced in the axial direction. In a sliding portion of the setting lever and the yoke, an engaging portion that removably engages one of the setting lever and the yoke with another is provided. The engaging portion engages the setting lever and the yoke with each other in a state where the winding stem <NUM> is located at each of the zeroth-step position and the first-step position. As a result, the winding stem <NUM> is held at each of the zeroth-step position and the first-step position.

A winding pinion <NUM> and a clutch wheel <NUM> are assembled on the winding stem <NUM>. The winding pinion <NUM> and the clutch wheel <NUM> are disposed at positions closer to an outer side of the movement <NUM> than the cylindrical portion 13a. The winding pinion <NUM> is provided so as to be displaceable in the axial direction with respect to the winding stem <NUM>. The winding pinion <NUM> is provided so as not to be displaceable in the axial direction of the winding stem <NUM> with respect to the main plate <NUM>. The winding pinion <NUM> is provided so as not to rotate with the winding stem <NUM> at the zeroth-step position and to rotate with the winding stem <NUM> at the first-step position. A crown wheel <NUM> meshes with the winding pinion <NUM> (see <FIG>). The clutch wheel <NUM> is disposed on the center side of the movement <NUM> with respect to the winding pinion <NUM>. The clutch wheel <NUM> has teeth protruding to the center side of the movement <NUM>. The clutch wheel <NUM> is provided so as to be displaceable in the axial direction with respect to the winding stem <NUM> and not rotatable with respect to the winding stem <NUM>. The clutch wheel <NUM> engages with the yoke and is displaced in the axial direction of the winding stem <NUM> with rotation of the yoke. Specifically, the clutch wheel <NUM> is displaced in a direction opposite to a displacement direction of the winding stem <NUM> with respect to the main plate <NUM> in conjunction with the displacement in the axial direction of the winding stem <NUM>. The clutch wheel <NUM> is located at a predetermined position in the axial direction in a state where the winding stem <NUM> is at the zeroth-step position. The clutch wheel <NUM> is located at a meshing position closer to the center side of the movement <NUM> than the predetermined position in the axial direction in a state where the winding stem <NUM> is at the first-step position. The clutch wheel <NUM> meshes with a minute wheel <NUM> (see <FIG>) at the meshing position.

As shown in <FIG>, the front train wheel <NUM> includes a movement barrel <NUM>, a center wheel and pinion <NUM>, a third wheel and pinion <NUM>, a second wheel and pinion <NUM>, and a center second pinion arbor <NUM>. The movement barrel <NUM> is disposed on one side with respect to the central axis of the winding stem <NUM> when viewed from the front side. The center wheel and pinion <NUM> and the center second pinion arbor <NUM> are disposed coaxially with the central axis O. Most of the third wheel and pinion <NUM> is disposed on an opposite side to the movement barrel <NUM> with respect to the central axis of the winding stem <NUM> when viewed from the front side. That is, most of the third wheel and pinion <NUM> and the movement barrel <NUM> are disposed on opposite sides of the central axis of the winding stem <NUM> when viewed from the front side. Put another way, the movement barrel <NUM> is disposed on the opposite side of the central axis of the winding stem <NUM> to most of the third wheel and pinion <NUM>. The entire second wheel and pinion <NUM> is disposed on the same side as the most of the third wheel and pinion <NUM> with respect to the central axis of the winding stem <NUM> when viewed from the front side.

As shown in <FIG>, the movement barrel <NUM> is rotatably supported by the main plate <NUM> and the barrel and train wheel bridge <NUM>. At least a part of the movement barrel <NUM> is disposed at the same position as the center wheel bridge <NUM> in the front-back direction. The movement barrel <NUM> includes a barrel arbor 31a, a barrel 31b supported by the barrel arbor 31a so as to be relatively rotatable, and a barrel tooth part 31c protruding from an outer peripheral surface of the barrel 31b. A tip end of a front side of the barrel arbor 31a is pivotally supported by the barrel and train wheel bridge <NUM> via a jeweled bush held by the barrel and train wheel bridge <NUM>. A tip end of a back side of the barrel arbor 31a is pivotally supported by the main plate <NUM> via a jeweled bush held by the main plate <NUM>. The barrel 31b is disposed between the main plate <NUM> and the barrel and train wheel bridge <NUM>. The barrel 31b accommodates a mainspring (not shown). A tip end of an inner peripheral side of the mainspring is engaged with the barrel arbor 31a. A tip end of an outer peripheral side of the mainspring is engaged with an inner side of the barrel 31b. The barrel tooth part 31c is provided closer to the main plate <NUM> than the center wheel bridge <NUM> in the front-back direction.

A ratchet wheel <NUM> is assembled on the barrel arbor 31a. The ratchet wheel <NUM> is disposed on a front side of the barrel 31b. The ratchet wheel <NUM> is provided on the barrel arbor 31a so as to not be relatively rotatable. The ratchet wheel <NUM> rotates via transmission gears (partly not shown) of the crown wheel <NUM> and the like by rotation of the winding pinion <NUM> described above (see <FIG>). By rotating the ratchet wheel <NUM>, the barrel arbor 31a rotates with respect to the barrel 31b, and the mainspring is wound up. The barrel 31b rotates by using power when the mainspring is unwound as a power source.

The center wheel and pinion <NUM> is rotatably supported by the main plate <NUM> and the center wheel bridge <NUM>. The center wheel and pinion <NUM> includes a center arbor 32a and a center wheel 32b assembled on the center arbor 32a. The center arbor 32a is formed in a cylindrical shape and extends in the front-back direction around the central axis O. A tip end of a front side of the center arbor 32a is pivotally supported by the center wheel bridge <NUM> via a jeweled bush <NUM> held by the center wheel bridge <NUM>. An intermediate portion of the center arbor 32a in the front-back direction is pivotally supported by the center wheel bridge <NUM> via the jeweled bush held by the main plate <NUM>. The center arbor 32a protrudes out of the back side of the main plate <NUM>. A center pinion 32c is formed in a part of the center arbor 32a located between the main plate <NUM> and the center wheel bridge <NUM>. The center pinion 32c meshes with the barrel tooth part 31c of the movement barrel <NUM>. As a result, the center wheel and pinion <NUM> is rotated by the power of the movement barrel <NUM>. The center wheel 32b is disposed between the main plate <NUM> and the center wheel bridge <NUM>. The center wheel 32b is adjacent to a back side of the center pinion 32c. A part of the center wheel 32b overlaps with the movement barrel <NUM> when viewed from the front side.

The third wheel and pinion <NUM> is rotatably supported by the main plate <NUM> and the barrel and train wheel bridge <NUM>. The third wheel and pinion <NUM> includes a third arbor 33a and a third wheel 33b assembled on the third arbor 33a. The third arbor 33a extends in the front-back direction. A tip end of a front side of the third arbor 33a is pivotally supported by the barrel and train wheel bridge <NUM>. A tip end of a back side of the third arbor 33a is pivotally supported by the main plate <NUM>. The third arbor 33a has a third pinion (not shown) that meshes with the center wheel 32b. As a result, the third wheel and pinion <NUM> is rotated by the power of the movement barrel <NUM>. The third wheel 33b is disposed between the barrel and train wheel bridge <NUM> and the center wheel bridge <NUM>. The third wheel 33b overlaps with the center wheel bridge <NUM> when viewed from the front side.

The second wheel and pinion <NUM> is rotatably supported by the main plate <NUM> and the barrel and train wheel bridge <NUM>. The second wheel and pinion <NUM> includes a second arbor 34a and a second wheel 34b assembled on the second arbor 34a. The second arbor 34a extends in the front-back direction. A tip end of a front side of the second arbor 34a is pivotally supported by the barrel and train wheel bridge <NUM>. A tip end of a back side of the second arbor 34a is pivotally supported by the main plate <NUM>. The second arbor 34a has a second pinion 34c that meshes with the third wheel 33b. As a result, the second wheel and pinion <NUM> is rotated by the power of the movement barrel <NUM>. The second wheel 34b is disposed closer to the main plate <NUM> than the third wheel 33b. At least a part of the second wheel 34b is disposed at the same position as the center wheel bridge <NUM> in the front-back direction.

The center second pinion arbor <NUM> extends in the front-back direction around the central axis O. The center second pinion arbor <NUM> is inserted into an inside of the center arbor 32a. A tip end of a front side of the center second pinion arbor <NUM> is pivotally supported by the barrel and train wheel bridge <NUM> via a jeweled bush held by the barrel and train wheel bridge <NUM>. An intermediate portion of the center second pinion arbor <NUM> in the front-back direction is supported on an inner peripheral surface of the center arbor 32a so as to be relatively rotatable. The second hand <NUM> is attached to a tip end of a back side of the center second pinion arbor <NUM>. The center second pinion arbor <NUM> has a center second pinion 35a. The center second pinion 35a is disposed between the barrel and train wheel bridge <NUM> and the center wheel bridge <NUM>. The center second pinion 35a meshes with the third wheel 33b. As a result, the center second pinion arbor <NUM> is rotated by the power of the movement barrel <NUM>.

The back train wheel <NUM> includes a cannon pinion <NUM>, an hour wheel <NUM>, and the minute wheel <NUM>.

The cannon pinion <NUM> is formed in a tubular shape as a whole, and is disposed coaxially with the central axis O. The cannon pinion <NUM> is disposed on the back side of the main plate <NUM> and is assembled on an outside of the center arbor 32a in a slippable manner. The cannon pinion <NUM> is rotated by the power of the movement barrel <NUM>. At a tip end of a front side of the cannon pinion <NUM>, teeth that mesh with the minute wheel <NUM> are provided. The cannon pinion <NUM> rotates while slipping with respect to the center wheel and pinion <NUM> in accordance with rotation of the winding stem <NUM> located at the first-step position. The minute hand <NUM> is attached to a tip end of a back side of the cannon pinion <NUM>.

The hour wheel <NUM> is formed in the tubular shape as a whole, and is disposed coaxially with the central axis O. The hour wheel <NUM> is assembled on an outside of the cannon pinion <NUM> so as to be relatively rotatable. At a tip end of a front side of the hour wheel <NUM>, teeth are provided. The hour hand <NUM> is attached to a tip end of a back side of the hour wheel <NUM>.

The minute wheel <NUM> is rotatably supported by the main plate <NUM>. The minute wheel <NUM> meshes with the teeth of the cannon pinion <NUM> and the teeth of the hour wheel <NUM>, and decelerates and transmits rotation of the cannon pinion <NUM> to the hour wheel <NUM>. As a result, the hour wheel <NUM> is rotated by the power of the movement barrel <NUM>.

The escapement governor mechanism <NUM> includes an escape wheel and pinion and a pallet fork (both not shown), and the balance with hairspring <NUM>. The escape wheel and pinion meshes with the second wheel 34b and rotates by the power transmitted from the movement barrel <NUM>. The pallet fork escapes the escape wheel and pinion to be rotated regularly. The balance with hairspring <NUM> reciprocally rotates at a constant cycle to swing the pallet fork. The escapement governor mechanism <NUM> controls the rotation of the front train wheel <NUM> by regular vibration of the balance with hairspring <NUM>.

The balance with hairspring <NUM> is disposed on an opposite side to the winding stem <NUM> with the central axis O interposed therebetween when viewed from the front side. The balance with hairspring <NUM> is disposed at a position where it does not overlap with the movement barrel <NUM>, the third wheel and pinion <NUM> and the second wheel and pinion <NUM> when viewed from the front side. The balance with hairspring <NUM> includes a balance staff <NUM>, a balance wheel <NUM>, and a hairspring <NUM>. The balance with hairspring <NUM> uses power of the hairspring <NUM> to reciprocally rotate around a central axis of the balance staff <NUM> at a constant vibration cycle. The balance staff <NUM> is a rod-shaped member extending in the front-back direction. The balance staff <NUM> is pivotally supported by the main plate <NUM> and a balance bridge (not shown). The balance staff <NUM> is press-fitted into a fitting hole of the balance wheel <NUM> and fixed to the balance wheel <NUM>. The balance wheel <NUM> includes an annular rim portion 53a that surrounds the balance staff <NUM> from an outside in a radial direction, and an arm portion 53b that connects the rim portion 53a and the balance staff <NUM> in the radial direction. The rim portion 53a is disposed coaxially with the balance staff <NUM>. An outer peripheral surface of the rim portion 53a has a constant outer diameter. The hairspring <NUM> is formed in a spiral shape in a plane perpendicular to the central axis of the balance staff <NUM>. An inner tip end of the hairspring <NUM> is fixed to the balance staff <NUM>. An outer tip end of the hairspring <NUM> is fixedly disposed with respect to the main plate <NUM>.

The train wheel setting mechanism <NUM> sets the balance with hairspring <NUM> by utilizing a switching operation performed on a position in the axial direction of the winding stem <NUM>. The train wheel setting mechanism <NUM> includes the balance with hairspring <NUM>, the center wheel and pinion <NUM> and the center wheel bridge <NUM>, which are described above, a train wheel setting lever <NUM> that is provided so as to be capable of contacting and separating from the balance with hairspring <NUM> and operates in conjunction with the winding stem <NUM>, and a biasing member <NUM> that biases the train wheel setting lever <NUM> against the center wheel bridge <NUM>.

<FIG> is a perspective view showing the center wheel bridge, the train wheel setting lever, and the biasing member according to the first embodiment.

As shown in <FIG> and <FIG>, the center wheel bridge <NUM> is formed in the plate shape having a thickness in the front-back direction. A front surface and a back surface of the center wheel bridge <NUM> respectively extend along a plane perpendicular to the front-back direction. The center wheel bridge <NUM> includes a first fixing portion <NUM> and a second fixing portion <NUM> that are fixed to the main plate <NUM>. The first fixing portion <NUM> is disposed between the winding stem <NUM> and the second wheel and pinion <NUM> when viewed from the front side. The second fixing portion <NUM> is closer to the first fixing portion <NUM> than the central axis of the winding stem <NUM> when viewed from the front side, and is disposed on an opposite side to the first fixing portion <NUM> with the second wheel and pinion <NUM> interposed therebetween in a circumferential direction around the central axis O. When viewed from the front side, the center wheel bridge <NUM> extends from the first fixing portion <NUM> to the second fixing portion <NUM> through the center side of the movement <NUM> with respect to the second wheel and pinion <NUM>. A jeweled bush holding portion <NUM> that holds the jeweled bush <NUM> is formed between the first fixing portion <NUM> and the second fixing portion <NUM> among the center wheel bridge <NUM>. The jeweled bush holding portion <NUM> is disposed along the central axis O. The jeweled bush holding portion <NUM> is separated from the main plate <NUM> and the barrel and train wheel bridge <NUM> in the front-back direction (see <FIG>). The jeweled bush holding portion <NUM> is formed with a through hole for holding the jeweled bush <NUM>.

A recess portion <NUM> and a pin hole <NUM> (see <FIG>) are formed in the center wheel bridge <NUM>. The recess portion <NUM> is formed on the front surface of the center wheel bridge <NUM> and is recessed towards the back side. The recess portion <NUM> is formed in a part of the center wheel bridge <NUM> excluding the first fixing portion <NUM>, the second fixing portion <NUM>, and the jeweled bush holding portion <NUM>. The recess portion <NUM> is formed to have a substantially constant depth. A bottom surface of the recess portion <NUM> is located on the back side relative to the balance wheel <NUM> of the balance with hairspring <NUM> (see <FIG>). The recess portion <NUM> includes a first opening portion 64a and a second opening portion 64b that open to a side surface of the center wheel bridge <NUM>. The first opening portion 64a is formed between the first fixing portion <NUM> and the jeweled bush holding portion <NUM>, and faces the tip end on the center side of the movement <NUM> in the winding stem <NUM> when viewed from the front side. The second opening portion 64b is formed between the second fixing portion <NUM> and the jeweled bush holding portion <NUM>, and faces the balance with hairspring <NUM> when viewed from the front side. As shown in <FIG>, the pin hole <NUM> penetrates the center wheel bridge <NUM> in the front-back direction and opens at the bottom surface of the recess portion <NUM>. The pin hole <NUM> is formed in a circular cross section shape.

As shown in <FIG> and <FIG>, a locking portion <NUM> for locking the biasing member <NUM> described later is disposed in the recess portion <NUM> of the center wheel bridge <NUM>. The locking portion <NUM> protrudes from the bottom surface of the recess portion <NUM> to the front side. The locking portion <NUM> is formed in a cylindrical shape. The locking portion <NUM> is a pin that is a member separate from the center wheel bridge <NUM>, and is press-fitted into a hole formed in the center wheel bridge <NUM>. The locking portion <NUM> is formed with a flange 66a that protrudes in a direction orthogonal to the front-back direction on the front side of the bottom surface of the recess portion <NUM>.

The train wheel setting lever <NUM> is disposed on an opposite side to the main plate <NUM> with the center wheel bridge <NUM> interposed therebetween. The train wheel setting lever <NUM> is disposed in the recess portion <NUM> of the center wheel bridge <NUM>. The train wheel setting lever <NUM> is rotatably supported by the center wheel bridge <NUM>. A rotation center of the train wheel setting lever <NUM> is located closer to the first fixing portion <NUM> and the second fixing portion <NUM> than the central axis of the winding stem <NUM> when viewed from the front side. The train wheel setting lever <NUM> includes a first arm <NUM> and a second arm <NUM> extending from the rotation center. The first arm <NUM> protrudes out of the center wheel bridge <NUM> through the first opening portion 64a of the recess portion <NUM>. The first arm <NUM> is formed so as to be capable of abutting against the winding stem <NUM>. The first arm <NUM> rotates in conjunction with the displacement in the axial direction of the winding stem <NUM>. The second arm <NUM> protrudes out of the center wheel bridge <NUM> through the second opening portion 64b of the recess portion <NUM>. The second arm <NUM> is formed to be contactable from an upstream side in a first direction L1 around the rotation center to an outer peripheral surface of the balance wheel <NUM> of the balance with hairspring <NUM>. The second arm <NUM> rotates in conjunction with rotation of the first arm <NUM>. A distance from the rotation center to a contact part between the second arm <NUM> and the balance with hairspring <NUM> is longer than a distance from the rotation center to a contact part between the first arm <NUM> and the winding stem <NUM>.

Specifically, the train wheel setting lever <NUM> has a following configuration. The train wheel setting lever <NUM> includes a support pin <NUM> held by the center wheel bridge <NUM>, a lever body <NUM> supported by the center wheel bridge <NUM> via the support pin <NUM>, and an abutting portion <NUM> and a contacting portion <NUM> supported by the lever body <NUM>. The support pin <NUM> is formed in the cylindrical shape. The support pin <NUM> is press-fitted into the pin hole <NUM> of the center wheel bridge <NUM> from the front side. The support pin <NUM> is formed with a flange 81a that protrudes in the direction orthogonal to the front-back direction on the front side of the bottom surface of the recess portion <NUM>. In the present embodiment, the support pin <NUM> is formed in the same manner as the locking portion <NUM> provided on the center wheel bridge <NUM>. The support pin <NUM> holds the lever body <NUM> between the bottom surface of the recess portion <NUM> and the flange 81a.

The lever body <NUM> is formed of a plate material having a thickness in the front-back direction. The lever body <NUM> is rotatably supported by the support pin <NUM>. The lever body <NUM> is disposed along the bottom surface of the recess portion <NUM>. The lever body <NUM> is formed thinner than the depth of the recess portion <NUM>. A part of the lever body <NUM> that overlaps with the center wheel bridge <NUM> when viewed from the front side is disposed so as not to protrude to the front side from the front surface of the center wheel bridge <NUM>. The lever body <NUM> extends out of the center wheel bridge <NUM> from each of the first opening portion 64a and the second opening portion 64b of the recess portion <NUM>, and forms a part of each of the first arm <NUM> and the second arm <NUM>.

The abutting portion <NUM> is supported by the lever body <NUM> on the first arm <NUM>. The abutting portion <NUM> is a member separate from the lever body <NUM>, and is assembled on the lever body <NUM> at a tip end portion of the first arm <NUM>. The abutting portion <NUM> is formed in the cylindrical shape, and disposed so as to protrude from the lever body <NUM> to the back side. The abutting portion <NUM> faces an outer peripheral surface of the winding stem <NUM> from the upstream side in the first direction L1. The abutting portion <NUM> displaces together with the lever body <NUM> in conjunction with the displacement in the axial direction of the winding stem <NUM>.

The contacting portion <NUM> is supported by the lever body <NUM> on the second arm <NUM>. At least a part of the contacting portion <NUM> is disposed at the same position as the balance wheel <NUM> of the balance with hairspring <NUM> in the front-back direction. The contacting portion <NUM> is a member separate from the lever body <NUM>, and is assembled to the lever body <NUM> at a tip end portion of the second arm <NUM>. The contacting portion <NUM> is formed in the cylindrical shape, and disposed so as to protrude from the lever body <NUM> to the front side. The contacting portion <NUM> faces the outer peripheral surface of the balance wheel <NUM> of the balance with hairspring <NUM> from the upstream side in the first direction L1. The contacting portion <NUM> contacts and separates from the balance wheel <NUM> of the balance with hairspring <NUM> as the lever body <NUM> is displaced.

The biasing member <NUM> biases the train wheel setting lever <NUM> toward the center wheel bridge <NUM> in the first direction L1. The biasing member <NUM> is integrally formed of the same member as the lever body <NUM> of the train wheel setting lever <NUM>. That is, the biasing member <NUM> and the lever body <NUM> are formed of a single plate material. The biasing member <NUM> is a cantilever beam extending from the lever body <NUM>. A base end of the biasing member <NUM> is coupled to the lever body <NUM> in the second arm <NUM> of the train wheel setting lever <NUM> at an outer side of the center wheel bridge <NUM> when viewed from the front side. The biasing member <NUM> enters an inside of the recess portion <NUM> from a coupled part with the lever body <NUM> through the first opening portion 64a. The biasing member <NUM> contacts with an outer peripheral surface of the locking portion <NUM> in the recess portion <NUM> from an upstream side in a second direction L2 opposite to the first direction L1. An entire part of a tip end portion of the biasing member <NUM> from an intersection part with the first opening portion 64a is disposed in the recess portion <NUM>.

Next, operations of the train wheel setting mechanism <NUM> will be described with reference to <FIG> and <FIG>.

<FIG> is a plan view of a part of the movement according to the first embodiment when viewed from the front side, and shows the state where the winding stem <NUM> is at the first-step position.

When the winding stem <NUM> is at the zeroth-step position, as shown in <FIG>, the abutting portion <NUM> of the train wheel setting lever <NUM> faces an outer peripheral surface of the cylindrical portion 13a of the winding stem <NUM> from the upstream side in the first direction L1. At this time, the train wheel setting lever <NUM> is biased in the first direction L1 by the biasing member <NUM>. Therefore, the abutting portion <NUM> is abutted against the winding stem <NUM> by a biasing force of the biasing member <NUM>. When the abutting portion <NUM> is abutted against the cylindrical portion 13a of the winding stem <NUM>, the contacting portion <NUM> of the train wheel setting lever <NUM> is separated from the balance wheel <NUM> of the balance with hairspring <NUM> on the upstream side in the first direction L1.

When the winding stem <NUM> is displaced from the zeroth-step position to the first-step position (<FIG>), the conical portion 13b of the winding stem <NUM> is disposed on a downstream side of the abutting portion <NUM> in the first direction L1. Then, the lever body <NUM> biased in the first direction L1 by the biasing member <NUM> rotates in the first direction L1, so that the abutting portion <NUM> is brought close to the central axis of the winding stem <NUM>. In the shown example, the abutting portion <NUM> does not contact with the winding stem <NUM> in the first-step position, but may contact with the conical portion 13b of the winding stem <NUM> in the first-step position. When the lever body <NUM> rotates in the first direction L1, the contacting portion <NUM> approaches and contacts the outer peripheral surface of the balance wheel <NUM>.

When the winding stem <NUM> is displaced from the first-step position to the zeroth-step position, the lever body <NUM> rotates in the second direction L2 so as to separate the abutting portion <NUM> from the central axis of the winding stem <NUM> while resisting the biasing force of the biasing member <NUM>. When the lever body <NUM> rotates in the second direction L2, the contacting portion <NUM> separates from the outer peripheral surface of the balance wheel <NUM>.

As a result, the train wheel setting mechanism <NUM> sets the balance with hairspring <NUM> by utilizing the switching operation performed on the position in the axial direction of the winding stem <NUM>.

As described above, the train wheel setting mechanism <NUM> of the present embodiment includes the train wheel setting lever <NUM> that operates in conjunction with the winding stem <NUM>, and the center wheel bridge <NUM> that supports the center wheel and pinion <NUM> together with the main plate <NUM>, and also supports the train wheel setting lever <NUM>.

According to this configuration, the train wheel setting lever <NUM> can be incorporated into the movement <NUM> without providing a pin or the like for supporting the train wheel setting lever <NUM> on the main plate <NUM>. As a result, a degree of freedom in shapes of parts other than the train wheel setting lever <NUM> is improved. Therefore, the train wheel setting mechanism <NUM> capable of preventing reduction in a design margin of the movement <NUM> can be provided.

In addition, the minute hand <NUM> is attached to the center wheel and pinion <NUM> supported by the center wheel bridge <NUM>.

According to this configuration, the center wheel bridge <NUM> is disposed closer to the main plate <NUM> than the barrel and train wheel bridge <NUM> that supports the center second pinion arbor <NUM> to which the second hand <NUM> is attached together with the main plate <NUM>. Therefore, the center wheel bridge <NUM> is disposed closer to the winding stem <NUM> than the barrel and train wheel bridge <NUM> in the front-back direction. Therefore, it becomes possible to easily design the configuration for operating the train wheel setting lever <NUM> in conjunction with the winding stem <NUM>.

Further, the train wheel setting mechanism <NUM> includes the biasing member <NUM> that biases the train wheel setting lever <NUM> toward the center wheel bridge <NUM>.

According to this configuration, the train wheel setting lever <NUM> is pressed in one direction by the biasing member <NUM>, so that rattling of the train wheel setting lever <NUM> can be reduced and the operation of the train wheel setting lever <NUM> can be stabilized.

In addition, the center wheel bridge <NUM> is formed with the recess portion <NUM> for accommodating the train wheel setting lever <NUM> and the biasing member <NUM>.

According to this configuration, a volume of a space occupied by the train wheel setting lever <NUM> and the biasing member <NUM> around the recess portion <NUM> can be reduced as compared with a configuration in which a recess portion is not formed in a center wheel bridge. As a result, a degree of freedom in shapes of parts other than the train wheel setting lever <NUM> and the biasing member <NUM> can be further improved.

Further, the biasing member <NUM> is provided integrally with the train wheel setting lever <NUM>.

According to this configuration, the number of parts can be reduced as compared with a configuration in which a biasing member is provided as a member separate from a train wheel setting lever. As a result, a manufacturing cost can be reduced.

In addition, the train wheel setting lever <NUM> includes the lever body <NUM> supported by the center wheel bridge <NUM>, the abutting portion <NUM> that is supported by the lever body <NUM> and abuts against the winding stem <NUM> by the biasing force of the biasing member <NUM>, and the contacting portion <NUM> that is supported by the lever body <NUM> and is capable of contacting the balance with hairspring <NUM>.

According to this configuration, by displacing the winding stem <NUM> in the axial direction, the abutting portion <NUM> can be displaced together with the lever body <NUM> according to a shape of the winding stem <NUM>. As a result, the contacting portion <NUM> supported by the lever body <NUM> can come into contact with and be separated from the balance with hairspring <NUM>. Therefore, the train wheel setting lever <NUM> can be operated in conjunction with the winding stem <NUM>.

Further, the train wheel setting lever <NUM> is disposed on the opposite side to the main plate <NUM> with the center wheel bridge <NUM> interposed therebetween.

According to this configuration, a space between the main plate <NUM> and the center wheel bridge <NUM> can be prevented from being occupied by the train wheel setting lever <NUM>. As a result, the degree of freedom in the shapes of the parts other than the train wheel setting lever <NUM> and the biasing member <NUM>, which are disposed between the main plate <NUM> and the center wheel bridge <NUM>, can be improved.

Further, since the movement <NUM> and the timepiece <NUM> of the present embodiment are provided with the train wheel setting mechanism <NUM> described above, the reduction in the design margin is prevented. Therefore, the movement <NUM> and the timepiece <NUM> can be easily assembled and the manufacturing cost can be reduced. Further, a large number of parts can be disposed around the train wheel setting lever <NUM>, and the movement <NUM> and the timepiece <NUM> having multiple functions can be provided.

In the present embodiment, the biasing member <NUM> is locked to the locking portion <NUM> that protrudes into the recess portion <NUM> of the center wheel bridge <NUM>, but for example, the center wheel bridge may be formed such that the biasing member is locked to a side wall surface of the recess portion <NUM>.

Next, the second embodiment is described with reference to <FIG>. In the first embodiment, the contacting portion <NUM> of the train wheel setting lever <NUM> is provided as the member separate from the lever body <NUM>. In contrast, the second embodiment differs from the first embodiment in that a contacting portion <NUM> of a train wheel setting lever <NUM> is provided as a same member as a lever body <NUM>. Further, the second embodiment is different from the first embodiment in that a second arm <NUM> is formed so as to be flexibly deformable. A configuration other than that described below is the same as that of the first embodiment.

<FIG> is a plan view of a part of a movement according to the second embodiment when viewed from the front side, and shows the state where the winding stem <NUM> is at the zeroth-step position.

As shown in <FIG>, the lever body <NUM> extends in the second arm <NUM> of the train wheel setting lever <NUM> with a width similar to that of the biasing member <NUM> when viewed from the front side, and is formed so as to be flexibly deformable. The contacting portion <NUM> is integrally formed of the same member as the lever body <NUM>. The contacting portion <NUM> is formed by bending a plate material forming the lever body <NUM> toward a front side at a tip end of the second arm <NUM>. The contacting portion <NUM> is formed to be in line contact with the outer peripheral surface of the balance wheel <NUM> of the balance with hairspring <NUM>.

<FIG> is a plan view of a part of the movement according to the second embodiment when viewed from the front side, and shows the state where the winding stem <NUM> is at the first-step position.

As shown in <FIG>, when the winding stem <NUM> is at the first-step position, the abutting portion <NUM> comes into contact with the conical portion 13b of the winding stem <NUM> from the upstream side in the first direction L1. The contacting portion <NUM> comes into contact with the outer peripheral surface of the balance wheel <NUM>. At this time, the lever body <NUM> is flexibly deformed in the second arm <NUM> of the train wheel setting lever <NUM>. A torque in the second direction L2 generated by the lever body <NUM> is smaller than a torque in the first direction L1 generated by the biasing member <NUM>. In this embodiment, the abutting portion <NUM> is in contact with the winding stem <NUM> from the upstream side in the first direction L1, so transmission of the biasing force of the biasing member <NUM> to the balance with hairspring <NUM> via the contacting portion <NUM> is restricted. However, this is not essential.

According to the second embodiment as described above, in addition to operational effects same as the first embodiment, following operational effects can be achieved.

In the present embodiment, the train wheel setting lever <NUM> includes the second arm <NUM> formed so as to be flexibly deformable. The abutting portion <NUM> abuts against the winding stem <NUM> in a state where the contacting portion <NUM> is in contact with the balance with hairspring <NUM>.

According to this configuration, since rotation of the lever body <NUM> by the biasing member <NUM> is restricted by bringing the abutting portion <NUM> into contact with the winding stem <NUM>, only a restoring force due to flexible deformation of the second arm <NUM> can be applied to the balance with hairspring <NUM> from the contacting portion <NUM>. As a result, a contact pressure between the train wheel setting lever <NUM> and the balance with hairspring <NUM> can be reduced. Therefore, damage to the balance with hairspring <NUM> due to contact with the train wheel setting lever <NUM> can be prevented.

Also, when the train wheel setting lever <NUM> separates from the balance with hairspring <NUM>, by restoration of the second arm <NUM>, the train wheel setting lever <NUM> can flip the balance with hairspring <NUM> and apply a rotational force to the balance with hairspring <NUM>. As a result, an operation of the balance with hairspring <NUM> can be promptly restarted.

Next, the third embodiment will be described with reference to <FIG>. In the first embodiment, the wheel setting lever <NUM> is rotatably supported by the center wheel bridge <NUM>. In contrast, the third embodiment differs from the first embodiment in that a train wheel setting lever <NUM> is supported by the center wheel bridge <NUM> so as to be movable in parallel. A configuration other than that described below is the same as that of the first embodiment.

<FIG> is a plan view of a part of a movement according to the third embodiment when viewed from the front side.

As shown in <FIG>, the recess portion <NUM> of the center wheel bridge <NUM> has a first recess portion <NUM> and a second recess portion <NUM>. The second recess portion <NUM> is formed deeper than the first recess portion <NUM> (also see <FIG>). The entire second recess portion <NUM> is formed on an inner side of the first recess portion <NUM> when viewed from the front side. The first recess portion <NUM> and the second recess portion <NUM> are respectively formed with a constant depth. The second recess portion <NUM> includes the first opening portion 64a and the second opening portion 64b.

A lever guide pin <NUM> is disposed on the center wheel bridge <NUM> instead of the locking portion <NUM> of the first embodiment. A pair of the lever guide pins <NUM> is provided. The lever guide pin <NUM> protrudes from a bottom surface of the second recess portion <NUM> to the front side. The pair of lever guide pins <NUM> is disposed side by side in the axial direction of the winding stem <NUM>. The lever guide pin <NUM> is formed in the cylindrical shape. In the present embodiment, the lever guide pin <NUM> is formed of a member separate from the center wheel bridge <NUM>, and is press-fitted into a hole formed in the center wheel bridge <NUM>. The lever guide pin <NUM> is formed so as not to protrude to the front side beyond the front surface of the center wheel bridge <NUM> and to protrude to the front side beyond the bottom surface of the first recess portion <NUM>.

<FIG> is a cross-sectional view showing the movement according to the third embodiment. <FIG> is a perspective view showing the center wheel bridge, the train wheel setting lever, and a biasing member according to the third embodiment. Note that in <FIG>, for convenience, a biasing member <NUM> is shown by a virtual line.

As shown in <FIG> and <FIG>, a train wheel setting mechanism <NUM> includes the train wheel setting lever <NUM> and the biasing member <NUM>.

The train wheel setting lever <NUM> is disposed in the second recess portion <NUM> of the center wheel bridge <NUM>. A part of the train wheel setting lever <NUM> that overlaps with the center wheel bridge <NUM> when viewed from the front side is disposed so as not to protrude to the front side beyond the bottom surface of the first recess portion <NUM> of the center wheel bridge <NUM>. The train wheel setting lever <NUM> is supported by the center wheel bridge <NUM> so as to be displaceable in the axial direction of the winding stem <NUM>. The train wheel setting lever <NUM> protrudes from the second recess portion <NUM> beyond the outside of the center wheel bridge <NUM> through the first opening portion 64a and the second opening portion 64b. The train wheel setting lever <NUM> is formed so as to engage with a member that is displaced in conjunction with the displacement in the axial direction of the winding stem <NUM>, and is capable of contacting the outer peripheral surface of the balance wheel <NUM> of the balance with hairspring <NUM>.

Specifically, the train wheel setting lever <NUM> has a following configuration. The train wheel setting lever <NUM> includes a lever body <NUM> supported by the center wheel bridge <NUM>, and an engaging portion <NUM> and a contacting portion <NUM> supported by the lever body <NUM>.

The lever body <NUM> is formed of a plate material having a thickness in the front-back direction. The lever body <NUM> is disposed along the bottom surface of the second recess portion <NUM>. The lever body <NUM> is formed thinner than a depth of the second recess portion <NUM> with respect to the bottom surface of the first recess portion <NUM>. A guide hole <NUM> into which the pair of lever guide pins <NUM> is inserted is formed in the lever body <NUM>. The guide hole <NUM> extends in the axial direction of the winding stem <NUM>. The guide hole <NUM> and the lever guide pin <NUM> allow the lever body <NUM> to move in parallel with the center wheel bridge <NUM> in the axial direction of the winding stem <NUM>, and meanwhile, a movement range in the axial direction of the winding stem <NUM> of the lever body <NUM> with respect to the center wheel bridge <NUM> is defined.

The lever body <NUM> includes a base portion <NUM> having the guide hole <NUM> formed therein and an arm <NUM> extending from the base portion <NUM>. The base portion <NUM> extends in the axial direction of the winding stem <NUM>. A first tip end 286a of the base portion <NUM> is formed so as to be capable of protruding to the outside of the center wheel bridge <NUM> through the second opening portion 64b. The arm <NUM> extends from an intermediate portion of the base portion <NUM>. The arm <NUM> protrudes to the outside of the center wheel bridge <NUM> through the first opening portion 64a. In the shown example, the pair of guide holes <NUM> is formed so that the lever guide pins <NUM> are inserted therein one by one, but only one guide hole <NUM> may be formed so that the pair of lever guide pins <NUM> is inserted together.

The engaging portion <NUM> engages with the clutch wheel <NUM>. The engaging portion <NUM> is formed so as to be capable of contacting the teeth of the clutch wheel <NUM> from the center side of the movement <NUM>. The engaging portion <NUM> is integrally formed of the same member as the lever body <NUM>. The engaging portion <NUM> is formed by bending a plate material forming the lever body <NUM> toward the front side at a tip end of the arm <NUM>.

As shown in <FIG>, an intermediate portion of the engaging portion <NUM> viewed from the front side intersects with the central axis of the winding stem <NUM>, and extends in a direction orthogonal to the axial direction of the winding stem <NUM>. Both tip ends of the engaging portion <NUM> when viewed from the front side extend in a direction away from the teeth of the clutch wheel <NUM> as a distance from the central axis of the winding stem <NUM> when viewed from the front side is increased. As a result, an edge of the engaging portion <NUM> is prevented from coming into contact with the teeth of the clutch wheel <NUM>.

As shown in <FIG> and <FIG>, at least a part of the contacting portion <NUM> is disposed at the same position as the balance wheel <NUM> of the balance with hairspring <NUM> in the front-back direction. The contacting portion <NUM> is formed so as to be capable of contacting the balance wheel <NUM> from the winding stem <NUM> side. The contacting portion <NUM> is integrally formed of the same member as the lever body <NUM>. The contacting portion <NUM> is formed by bending the plate material forming the lever body <NUM> toward the front side at the first tip end 286a of the base portion <NUM>. The contacting portion <NUM> has a connection portion with the base portion <NUM> as a base end, and extends in the direction orthogonal to the axial direction of the winding stem <NUM> when viewed from the front side. The contacting portion <NUM> is formed so as to be flexibly deformable.

As shown in <FIG>, the biasing member <NUM> biases the train wheel setting lever <NUM> toward the center wheel bridge <NUM> in a direction in which the engaging portion <NUM> abuts against the clutch wheel <NUM>. The biasing member <NUM> is disposed in the recess portion <NUM> of the center wheel bridge <NUM>. A part of the biasing member <NUM> that overlaps with the center wheel bridge <NUM> when viewed from the front side is disposed so as not to protrude to the front side beyond the front surface of the center wheel bridge <NUM>. The biasing member <NUM> includes a supported portion <NUM> supported by the center wheel bridge <NUM>, and a spring portion <NUM> extending from the supported portion <NUM>. The supported portion <NUM> is formed of a plate material having a thickness in the front-back direction. The supported portion <NUM> is disposed so as to overlap the first recess portion <NUM> and the second recess portion <NUM> when viewed from the front side. The supported portion <NUM> is disposed along the bottom surface of the first recess portion <NUM> and a front surface of the lever body <NUM> of the train wheel setting lever <NUM>. The supported portion <NUM> is formed thinner than a depth of the first recess portion <NUM>. A hole into which the lever guide pin <NUM> is press-fitted is formed in the supported portion <NUM>. As a result, the supported portion <NUM> is fixed to the center wheel bridge <NUM>.

The spring portion <NUM> is a cantilever beam extending from the supported portion <NUM>. Substantially the entire spring portion <NUM>, excluding a tip end portion, overlaps the first recess portion <NUM> when viewed from the front side. The spring portion <NUM> protrudes to the outside of the center wheel bridge <NUM> through the first opening portion 64a. A tip end of the spring portion <NUM> is located at the outside the center wheel bridge <NUM> and is bent toward the back side. The tip end of the spring portion <NUM> is in contact with the first end portion 286a of the base portion <NUM> of the lever body <NUM>.

Next, operations of the train wheel setting mechanism <NUM> will be described.

When the winding stem <NUM> is at the zeroth-step position, the engaging portion <NUM> of the train wheel setting lever <NUM> preferably abuts against the teeth of the clutch wheel <NUM> located at a predetermined position in the axial direction of the winding stem <NUM> from the center side of the movement <NUM>. At this time, the contacting portion <NUM> is separated from the balance wheel <NUM> of the balance with hairspring <NUM> toward the winding stem <NUM> side.

When the winding stem <NUM> is displaced from the zeroth-step position to the first-step position, the clutch wheel <NUM> is displaced from the predetermined position toward the center side of the movement <NUM>. Then, the engaging portion <NUM> is displaced toward the center side of the movement <NUM> as the clutch wheel <NUM> is moved. As a result, the train wheel setting lever <NUM> biased by the biasing member <NUM> is displaced in the axial direction of the winding stem <NUM> while resisting the biasing force of the biasing member <NUM>. The contacting portion <NUM> approaches and contacts the outer peripheral surface of the balance wheel <NUM> as the engaging portion <NUM> moves toward the center side of the movement <NUM>. At this time, the contacting portion <NUM> may be flexibly deformed.

When the winding stem <NUM> is displaced from the first-step position to the zeroth-step position, the clutch wheel <NUM> is displaced toward the outside of the movement <NUM>. Since the biasing member <NUM> biases the train wheel setting lever <NUM> in the direction in which the engaging portion <NUM> abuts against the clutch wheel <NUM>, the train wheel setting lever <NUM> displaces toward the outside of the movement <NUM> as the clutch wheel <NUM> is displaced. Then, the contacting portion <NUM> separates from the outer peripheral surface of the balance wheel <NUM>.

According to the third embodiment as described above, in addition to the operational effects same as the first embodiment, following operational effects can be achieved.

In the present embodiment, the train wheel setting lever <NUM> includes the lever body <NUM> supported by the center wheel bridge <NUM>, the engaging portion <NUM> supported by the lever body <NUM> and formed to be engageable with the clutch wheel <NUM>, and the contacting portion <NUM> supported by the lever body <NUM> and capable of contacting the balance with hairspring <NUM>.

According to this configuration, by displacing the winding stem <NUM> in the axial direction, the engaging portion <NUM> can be displaced together with the lever body <NUM> as the clutch wheel <NUM> is displaced. As a result, the contacting portion <NUM> supported by the lever body <NUM> can come into contact with and be separated from the balance with hairspring <NUM>. Therefore, the train wheel setting lever <NUM> can be operated in conjunction with the winding stem <NUM>.

Further, the train wheel setting lever <NUM> includes the contacting portion <NUM> formed so as to be flexibly deformable.

According to this configuration, by flexibly deforming the contacting portion <NUM>, a contact pressure between the train wheel setting lever <NUM> and the balance with hairspring <NUM> can be reduced. Therefore, damage to the balance with hairspring <NUM> due to contact with the train wheel setting lever <NUM> can be prevented.

Next, the fourth embodiment will be described with reference to <FIG>. In the first embodiment, the support pin <NUM> of the train wheel setting lever <NUM> is press-fitted into the center wheel bridge <NUM>. In contrast, the fourth embodiment differs from the first embodiment in that a support pin <NUM> of the train wheel setting lever <NUM> is attached to the center wheel bridge <NUM> by a screw connection. A configuration other than that described below is the same as that of the first embodiment.

<FIG> is a plan view of a part of a movement according to the fourth embodiment when viewed from the front side. <FIG> is a cross-sectional view showing the movement according to the fourth embodiment.

As shown in <FIG> and <FIG>, the support pin <NUM> includes a screw socket <NUM> inserted from the back side into the pin hole <NUM> of the center wheel bridge <NUM>, and a screw <NUM> screwed into the screw socket <NUM>. The screw socket <NUM> is formed in a cylindrical shape extending in the front-back direction, and has a thread cut on an inner peripheral surface. The screw socket <NUM> protrudes from the bottom surface of the recess portion <NUM> of the center wheel bridge <NUM> to the front side. The lever body <NUM> of the train wheel setting lever <NUM> is mounted on an outer peripheral surface of the screw socket <NUM>. At a tip end on the back side of the screw socket <NUM>, a flange portion that fits in a spot of the pin hole <NUM> is provided. The screw <NUM> is screwed into the screw socket <NUM> from the front side. A head portion of the screw <NUM> protrudes radially outward beyond the outer peripheral surface of the screw socket <NUM>. The support pin <NUM> holds the lever body <NUM> between the bottom surface of the recess portion <NUM> and the head portion of the screw <NUM>.

According to the fourth embodiment as described above, in addition to the operational effects same as the first embodiment, following operational effects can be achieved.

In the present embodiment, the support pin <NUM> holds the lever body <NUM> between the head portion of the screw <NUM> and the center wheel bridge <NUM>.

According to this configuration, the lever body <NUM> can be easily removed from the center wheel bridge <NUM> as compared with a configuration in which the lever body <NUM> is held with the center wheel bridge <NUM> by the support pin press-fitted into the center wheel bridge <NUM>. Therefore, a train wheel setting mechanism <NUM> having excellent maintainability can be provided.

Next, the fifth embodiment will be described with reference to <FIG>. In the second embodiment, the train wheel setting lever <NUM> is disposed on the opposite side to the main plate <NUM> with the center wheel bridge <NUM> interposed therebetween. In contrast, the fifth embodiment differs from the second embodiment in that a train wheel setting lever <NUM> is disposed between a center wheel bridge <NUM> and the main plate <NUM>. A configuration other than that described below is the same as that of the second embodiment. The same changes can be made to the first and other embodiments.

<FIG> is a plan view of a part of a movement according to the fifth embodiment when viewed from the front side. <FIG> is a cross-sectional view showing the movement according to the fifth embodiment.

As shown in <FIG> and <FIG>, the center wheel bridge <NUM> is formed substantially symmetrically with the front and back of the center wheel bridge <NUM> of the second embodiment. A recess portion <NUM> of the center wheel bridge <NUM> is formed on a back surface of the center wheel bridge <NUM> and is recessed towards the front side.

The train wheel setting lever <NUM> includes a lever body <NUM> supported by the center wheel bridge <NUM> via the support pin <NUM>, and an abutting portion <NUM> and a contacting portion <NUM> supported by the lever body <NUM>. A part of the lever body <NUM> that overlaps with the center wheel bridge <NUM> when viewed from the back side is disposed so as not to protrude to the back side beyond a back surface of the center wheel bridge <NUM>. The lever body <NUM> is formed to be flexibly deformable. The abutting portion <NUM> is disposed to protrude from the lever body <NUM> to the back side. The contacting portion <NUM> is disposed at an outside of the center wheel bridge <NUM>. At least a part of the contacting portion <NUM> is disposed at the same position as the balance wheel <NUM> of the balance with hairspring <NUM> in the front-back direction. The contacting portion <NUM> is integrally formed of the same member as the lever body <NUM>. The contacting portion <NUM> is formed by bending a plate material forming the lever body <NUM> toward a front side at a tip end of the second arm <NUM>.

A base end of a biasing member <NUM> is coupled to the lever body <NUM> at a position overlapping the center wheel bridge <NUM> when viewed from the back side. The entire biasing member <NUM> is disposed in the recess portion <NUM>.

According to the fifth embodiment as described above, in addition to the operational effects same as the second embodiment, following operational effects can be achieved.

In the present embodiment, the train wheel setting lever <NUM> is disposed between the center wheel bridge <NUM> and the main plate <NUM>.

According to this configuration, a space on the opposite side to the main plate <NUM> with the center wheel bridge <NUM> interposed therebetween can be prevented from being occupied by the train wheel setting lever <NUM>. As a result, a degree of freedom in shapes of parts other than the train wheel setting lever <NUM> and the biasing member <NUM>, which are disposed on the opposite side to the main plate <NUM> with the center wheel bridge <NUM> interposed therebetween, can be improved.

The invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications can be considered within the technical scope thereof.

For example, in the above-mentioned embodiments, a bridge member that supports the train wheel setting lever is the center wheel bridge, but the invention is not limited thereto. For example, the barrel and train wheel bridge that supports a rotating body such as the movement barrel <NUM>, the third wheel and pinion <NUM>, the second wheel and pinion <NUM>, and the center second pinion arbor <NUM> together with the main plate <NUM> may support the train wheel setting lever.

Further, in the above-mentioned embodiments, the center wheel and pinion <NUM> is supported by the center wheel bridge <NUM> via the jeweled bush <NUM> held by the center wheel bridge <NUM>, but the configuration for supporting the center wheel and pinion by the center wheel bridge is not limited thereto. For example, the center wheel and pinion may be supported by the center wheel bridge by being assembled on an outer peripheral side of a pipe supported by the center wheel bridge.

In the above-mentioned embodiments, the train wheel setting lever is formed so as to be capable of contacting the balance wheel <NUM> of the balance with hairspring <NUM> on the outside of the center wheel bridge when viewed from the front side. However, the train wheel setting lever may be formed so as to be capable of contacting with the balance wheel at a position overlapping the center wheel bridge when viewed from the front side.

Further, in the third embodiment described above, parallel movement of the lever body <NUM> with respect to the center wheel bridge <NUM> is guided by the pair of lever guide pins <NUM> provided on the center wheel bridge <NUM>, and the guide hole <NUM> provided on the train wheel setting lever <NUM>. However, the mechanism for guiding the parallel movement of the lever body with respect to the center wheel bridge is not limited thereto. For example, the lever guide pin may be formed in a shape extending in a moving direction of the lever body when viewed from the front side. For example, the parallel movement of the lever body with respect to the center wheel bridge may be guided by the lever body slidingly contacting a side wall surface of the recess portion of the center wheel bridge.

Further, in the third embodiment, the train wheel setting lever <NUM> is engaged with the clutch wheel <NUM> by the biasing member <NUM> biasing the train wheel setting lever <NUM>. In a non claimed example, without using the biasing member, by engaging the train wheel setting lever with the clutch wheel in a non-separable manner, the train wheel setting lever may be configured to be displaced in conjunction with the displacement of the clutch wheel. The train wheel setting lever may be engaged with a member that is displaced in conjunction with the displacement in the axial direction of the winding stem <NUM>, and may be engaged with, for example, the setting lever or the yoke.

Claim 1:
A train wheel setting mechanism (<NUM>) comprising:
a first rotating body (<NUM>) and a second rotating body (<NUM>) that are supported by a main plate (<NUM>);
a train wheel setting lever (<NUM>) that is provided to be capable of coming into contact with and separating from the first rotating body (<NUM>), and configured to operate in conjunction with a winding stem (<NUM>);
a bridge member (<NUM>) that supports the second rotating body (<NUM>) together with the main plate (<NUM>), and also supports the train wheel setting lever (<NUM>); and
a biasing member (<NUM>) configured to bias the train wheel setting lever (<NUM>) with respect to the bridge member (<NUM>).