CN106970514B

CN106970514B - Positioning lever mechanism, movement, and timepiece

Info

Publication number: CN106970514B
Application number: CN201710015921.9A
Authority: CN
Inventors: 荒川康弘
Original assignee: Seiko Instruments Inc
Current assignee: Seiko Chronometer Co ltd
Priority date: 2016-01-13
Filing date: 2017-01-10
Publication date: 2021-01-29
Anticipated expiration: 2037-01-10
Also published as: JP2017125745A; CH712030A2; CH712030B1; JP6661379B2; CN106970514A

Abstract

The invention provides a jumper mechanism, a movement, and a timepiece, which can restrain excessive rotation of a gear due to external force on the basis of restraining durability reduction. The disclosed device is provided with: a jump-calendar regulating unit (54) that swings around a swing shaft (O3), engages with or disengages from the date star wheel (34) that rotates around the center shaft (O1), and regulates the rotation of the date star wheel (34) for a jump-calendar; and a claw part (55) which swings around a swing shaft (O3) integrally with the jump limit part (54) and can contact with the date star wheel (34), when one of the jump limit part (54) and the claw part (55) approaches the date star wheel (34), the other moves away from the date star wheel (34).

Description

Positioning lever mechanism, movement, and timepiece

Technical Field

The invention relates to a jumper mechanism, a movement, and a timepiece.

Background

Conventionally, there is known a timepiece provided with a calendar mechanism in which calendar information on a calendar (for example, month, date, week, or the like) is indicated by a hand (calendar hand) (for example, see patent documents 1 and 2 below). Such a calendar mechanism includes, for example: a date star wheel mounted with a date hand for indicating date; a date changing wheel which rotates the date star wheel; and a date positioning lever that performs a jump-calendar restriction on rotation of the date star wheel.

The date jumper is configured to be swingable in directions to approach and separate from the date star wheel. The date positioning lever is urged toward the date star wheel by a positioning lever spring.

According to this configuration, when the date star wheel rotates due to the rotation of the day change wheel, the date jumper is pushed out by the tooth portion of the date star wheel, thereby swinging in a direction against the urging force of the jumper spring. Thereby, the engagement between the date jumper and the date star wheel is released. Thereafter, the date jumper is swung toward the date star wheel by the biasing force of the date jumper spring after passing over the tooth portion of the date star wheel. Thereby, the date jumper is engaged with the date star wheel again. As a result, the date star wheel rotates by 1 tooth, and the date hand rotates by 1 day.

Patent document 1: japanese Kokoku publication Sho 63-187089

Patent document 2: japanese Kokoku publication Sho 63-10483

However, with the above-described prior art, in the case where an external force such as a drop impact is applied to the timepiece, the date star wheel may rotate more than expected. Specifically, if the torque of the date star wheel around the rotation center exceeds the biasing force of the date star wheel spring, the engagement between the date star wheel and the date jumper is released. In particular, a large date hand is used in a so-called central date (センターデイト) system in which a date hand and a time hand (hour hand, minute hand, second hand, or the like) indicating time information are provided on the same axis. Therefore, the date star wheel is likely to rotate excessively (for example, 2 teeth or more) by the inertia of the date hand. As a result, there is a concern that: a so-called flying probe in which the date probe rotates for 2 days or more, for example, occurs. In this case, there are problems that the user is given an unpleasant feeling and the date correction operation becomes complicated.

In order to solve the above problem, it is conceivable to increase the biasing force of the positioning rod spring. However, in this case, a large load may be applied to the date jumper, the date star wheel, and the like, which may cause a reduction in durability, and the like.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a detent mechanism, a movement, and a timepiece, which can suppress excessive rotation of a gear due to external force while suppressing a decrease in durability.

In order to solve the above problem, a positioning lever mechanism according to an aspect of the present invention includes: a jump-calendar regulating unit that swings around a 1 st axis and engages with or disengages from a gear that rotates around a 2 nd axis to regulate the rotation of the gear; and a pawl portion that is swingable around the 1 st axis integrally with the jump limit portion and that is contactable with the gear, and when either one of the jump limit portion and the pawl portion approaches the gear, the other one of the jump limit portion and the pawl portion moves away from the gear.

In this aspect, when the gear rotates, the jump limiter is pushed in a direction away from the gear by the gear tooth portion. Thus, the jump regulating portion swings from a seating position where the jump regulating portion engages with the gear to regulate the rotation of the gear to a release position where the engagement with the gear is released to allow the rotation of the gear. By repeating the above-described operations, the jump limiting unit limits the rotation of the gear.

Here, in the case where the gear rotates more than expected due to the influence of the external force, there is a concern that: the jump limiting portion is greatly pushed out from the gear. In this case, the gear attempts to rotate excessively (for example, by 1 tooth or more) before the jump limit portion returns from the release position to the seating position.

Here, according to this aspect, when either one of the jump limiting portion and the claw portion approaches the gear, the other one is away from the gear, and therefore the claw portion approaches the gear in accordance with the distance that the jump limiting portion is away from the gear. Therefore, when the gear rotates more than expected due to the influence of the external force, causing the jump limiting portion to be pushed out greatly from the gear, the claw portion can be brought into contact with the gear. This can suppress excessive rotation (for example, 2 teeth or more) of the gear.

Further, in comparison with a configuration in which the urging force of the jumper spring is increased, for example, in order to suppress the jump limiting section from being largely pushed out of the gear by the external force, it is possible to suppress an increase in load applied to the jumper mechanism and the gear. This can suppress excessive rotation of the gear while maintaining durability.

In the above aspect, the pawl portion may contact the gear when the jump limiting portion moves to a position radially outward of an outermost peripheral portion of the gear in a radial direction perpendicular to the 2 nd axis.

According to this aspect, the claw portion can be prevented from coming into contact with the tooth portion during a normal calendar feeding operation. This prevents a load from being applied between the pawl portion and the gear during the calendar feeding operation. As a result, the gear can be smoothly rotated, and the durability of the pawl portion and the gear can be suppressed from being reduced.

In the above aspect, the claw portion may be formed to be able to enter between adjacent tooth portions of the gear.

According to this aspect, the pawl portion is formed so as to be able to enter between adjacent tooth portions (trough portions) on the gear, and therefore, the pawl portion and the tooth portions can be brought into contact with each other in the rotational direction of the gear. This can reliably restrict excessive rotation of the gear.

In the above aspect, the pawl portion may have a recess portion capable of receiving the tooth portion of the gear.

According to this aspect, the tooth portion is housed in the recess portion of the pawl portion, and therefore, when the gear rotates unexpectedly, the rotation of the gear is easily stopped at a predetermined position. As a result, when the jump regulating portion returns to the seating position, the jump regulating portion can be reliably inserted into the valley portion of the gear.

In the above aspect, the claw portion may be formed in a tapered shape that tapers toward a distal end portion in a plan view viewed from the 1 st axis in the axial direction.

According to the present aspect, the claw portion is formed in the tapered shape that tapers toward the tip end portion, and therefore the claw portion easily enters the valley portion of the gear. Thus, when the gear attempts to rotate excessively, the pawl portion and the gear tooth portion can be reliably brought into contact with each other.

Further, since the tooth portion is easily brought into sliding contact with the inclined surface of the pawl portion, the pawl portion can be pushed out in a direction away from the gear by the rotation of the gear. This makes it possible to quickly return the jump regulating portion to the seated position.

In the above aspect, the jumper mechanism may include a jumper spring that biases the jump limiting portion toward the gear.

According to this aspect, the jump regulating portion is biased toward the gear by the positioning lever spring, and therefore, the jump regulating portion can be quickly returned to the seated position even if pushed out to the release position by the gear. This can suppress excessive rotation of the gear.

A movement according to an aspect of the present invention is provided with the positioning lever mechanism according to the above aspect.

A timepiece according to an aspect of the present invention includes the movement according to the above aspect.

According to this structure, a movement and a timepiece excellent in operability and reliability can be provided.

According to one embodiment of the present invention, excessive rotation of the gear can be suppressed while suppressing a decrease in durability.

Drawings

Fig. 1 is an external view of a timepiece according to an embodiment.

Fig. 2 is a plan view of the movement according to the embodiment.

Fig. 3 is a plan view of the calendar mechanism according to the embodiment.

Fig. 4 is an operation explanatory diagram for explaining a date feeding operation of the calendar mechanism according to the embodiment.

Fig. 5 is an operation explanatory diagram for explaining a date feeding operation of the calendar mechanism according to the embodiment.

Fig. 6 is an operation explanatory diagram for explaining the flying-hand suppressing operation of the calendar mechanism according to the embodiment.

Fig. 7 is an operation explanatory diagram for explaining the flying-hand suppressing operation of the calendar mechanism according to the embodiment.

Fig. 8 is a plan view of a calendar mechanism according to a modification of the embodiment.

Fig. 9 is a plan view of a calendar mechanism according to a modification of the embodiment.

Description of the reference symbols

1: a timepiece;

10: a movement;

34: date star wheel (gear);

36: a date positioning rod spring;

51: a tooth portion;

54: a jump calendar limiting section;

55. 110, 121: a claw portion.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

[ watch ]

Fig. 1 is an external view of the timepiece 1. In the drawings shown below, a part of the timepiece components is omitted for easy viewing of the drawings, and the timepiece components are simplified and shown.

As shown in fig. 1, the timepiece 1 of the present embodiment is configured by incorporating a movement 10 (see fig. 2), a dial 2, various hands 3 to 6, and the like into a timepiece case 7.

On the dial 2 are marked: a time display unit 8 for displaying information related to time; and a date display unit 9 for displaying information related to the date. In the present embodiment, the date display unit 9 is configured to: numerals "1" to "31" are marked on the dial 2 at positions on the outer periphery side of the time display unit 8. The date display unit 9 is not limited to a numeral, and may be a scale or the like.

The various hands 3 to 6 are time hands (hour hand 3, minute hand 4, and second hand 5) for indicating the time display unit 8 and date hands 6 for indicating the date display unit 9. The hands 3 to 6 are configured to be rotatable around a center axis O1 (2 nd axis) of the movement 10. That is, the timepiece 1 of the present embodiment is a so-called center date system in which the various hands 3 to 6 rotate on the same axis.

The timepiece case 7 includes a case body 11, a case cover (not shown), and a cover glass 12. At a portion at point 3 (right side in fig. 1) in the side surface of the housing main body 11, a crown 15 is provided. The crown 15 is used to operate the movement 10 from the outside of the case main body 11. The crown 15 is integrated with a stem 16 inserted through the housing body 11.

[ movement ]

Fig. 2 is a top view of movement 10. In the following description, the cover glass 12 side (dial 2 side) of the timepiece case 7 is referred to as the "back side" of the movement 10 and the case lid side (the opposite side to the dial 4 side) is referred to as the "front side" of the movement 10 with respect to the main plate 21 constituting the substrate of the movement 10.

As shown in fig. 2, the movement 10 has a main plate 21. The above-described stem 16 shown in fig. 1 is assembled in a stem guide hole, not shown, of the main plate 21. The stem 16 is used for date or time correction. The stem 16 is rotatable about its axis and movable in the axial direction. A tip end portion (an end portion on the opposite side to the crown 15 side) of the stem 16 is linked with the movement 10.

A front gear train 22 and an unillustrated escape governor that controls the rotation of the front gear train 22 are incorporated on the front side of the main plate 21. The front side gear train 22 includes a barrel wheel 23, a second wheel, a third wheel, and a fourth wheel (none of which are shown).

The second hand 3 is attached to the fourth wheel of the front wheel train 22. The second wheel is provided with a minute hand 4. The hour hand 5 is attached to the hour wheel 25 that rotates with the rotation of the second wheel. The fourth wheel, the second wheel, and the hour wheel 25 are disposed on the same axis as the center axis O1 of the movement 10.

< calendar mechanism >

A calendar mechanism 31 is assembled on the rear surface side of the main plate 21. The calendar mechanism 31 includes a date change intermediate wheel 32, a date change wheel 33, a date star wheel 34, a date positioning lever 35, a date positioning lever spring 36, and the like. The date jumper 35 and the date jumper spring 36 in the calendar mechanism 31 constitute a jumper mechanism of the present embodiment. In fig. 2, reference numeral 41 denotes a calendar correction wheel train for correcting the date, and reference numeral 42 denotes a day correction wheel train for correcting the day.

The date change intermediate wheel 32 is fixed to the hour wheel 25 by press fitting or the like. That is, the day change intermediate wheel 32 is configured to be rotatable integrally with the hour wheel 25 in a clockwise direction (hereinafter, referred to as a CW direction) around the center axis O1. In this case, the weekday intermediate wheel 32 rotates 1 turn every 12 hours.

The day-shift wheel 33 is configured to be rotatable in a counterclockwise direction (hereinafter, referred to as a CCW direction) about a rotation axis O2 parallel to the center axis O1. Specifically, the date changing wheel 33 has a date changing gear portion 44 and a date feeding claw 45.

The date change gear portion 44 meshes with the date change intermediate wheel 32. The number of teeth of the day-change gear portion 44 is set so that the day-change wheel 33 rotates once every 24 hours.

The date feed pawl 45 is configured to be engageable with the tooth portion 51 of the date star wheel 34. The date feed claw 45 rotates the date star wheel 34 1 time (at the time of 0 am) for 1 day (by 1 tooth) within 1 day.

Fig. 3 is a plan view of the calendar mechanism 31.

As shown in fig. 3, the date star wheel 34 is arranged on the same axis as the center axis O1. The date star wheel 34 is configured to be rotatable relative to the hour wheel 25 and the day change intermediate wheel 32 in the CW direction about the center axis O1. The date hand 6 (see fig. 1) is attached to a portion of the date star wheel 34 located on the back surface side of the dial 2.

The date star wheel 34 has a 31-tooth portion 51. The tooth portion 51 is configured to be engageable with the date feeding claw 45. The date star wheel 34 is fed by 1 tooth a day by the date feeding claw 45 of the date changing wheel 33 as described above. Thereby, the date star wheel 34 rotates 1 turn every 31 days.

The date jumper 35 is configured to be swingable around a swing axis O3 arranged parallel to the center axis O1. The date jumper 35 includes: a positioning lever shaft 50 extending along the swing shaft O3; a rod portion 53 fixed to the positioning rod shaft 50; and a jump regulating portion 54 and a claw portion 55 formed on the lever portion 53. In the following description, the direction along the center axis O1 is simply referred to as the axial direction, the direction around the center axis O1 is referred to as the circumferential direction, and the direction perpendicular to the center axis O1 is referred to as the radial direction.

The lever portion 53 is formed in a V shape expanding toward the center axis O1 in a plan view seen from the axial direction. The lever portion 53 includes: a base 61 fixed to the positioning lever shaft 50; and a 1 st arm 62 and a 2 nd arm 63 extending in two forks from the base 61. In a plan view, the

arms

62 and 63 extend in directions away from each other as they extend toward the distal end portions. In the example of fig. 3, the width of the 1 st arm 62 is wider than the width of the 2 nd arm 63. In the example of fig. 3, the lengths of the

arms

62 and 63 are equal to each other, but the invention is not limited thereto. The lever 53 may be configured to swing relative to the positioning lever shaft 50.

The jump limiter 54 is provided to project from the distal end portion of the 1 st arm 62 toward the center axis O1. The jump regulating portion 54 is formed in a triangular shape (tapered shape) whose width gradually decreases toward the center axis O1 in plan view. That is, the jump limiting unit 54 includes: a back inclined surface 54a located on the back side of the vertex in the CW direction of the date star wheel; and a front inclined surface 54b located on the front side in the CW direction of the date star wheel 34 with respect to the apex. The tip end portion of the jump regulating portion 54 can enter between the adjacent tooth portions 51 (valley portions 52) of the date star wheel 34.

The jump regulating portion 54 regulates the rotation of the date star wheel 34 by engaging or disengaging the tooth portion 51 of the date star wheel 34 as the date jumper 35 swings. Specifically, when the date jumper 35 swings in the CW direction about the swing shaft O3, the jump regulating portion 54 enters the trough portion 52 of the date star wheel 34 and engages with the tooth portion 51 in the circumferential direction (the rotational direction of the date star wheel 34). Thereby, the date star wheel 34 is restricted in rotation (seated position) by the jumper restriction section 54. On the other hand, when the date jumper 35 swings in the CCW direction about the swing axis O3, the jump regulator 54 retreats from the valley portion 52 of the date star wheel 34, and the engagement between the jump regulator 54 and the tooth portion 51 is released. Thereby, the date star wheel 34 is allowed to rotate (release position) by the jumper restriction section 54.

The claw portion 55 is provided to protrude from the distal end portion of the 2 nd arm 63 toward the center axis O1. The claw portion is formed in a triangular shape (tapered shape) whose width gradually decreases toward the center axis O1 in plan view. The distal end portion of the claw portion 55 can enter the valley portion 52 of the date star wheel 34. That is, the claw portion 55 has: a back inclined surface 55a located on the back side of the vertex in the CW direction of the date star wheel; and a front inclined surface 55b located on the front side in the CW direction of the date star wheel 34 with respect to the apex.

The pawl 55 can engage with the tooth 51 of the date star wheel 34 as the date jumper 35 swings. Specifically, the date jumper 35 enters the trough portion 52 of the date star wheel 34 when swinging in the CCW direction about the swing shaft O3, and engages with the tooth portion 51 in the circumferential direction. Thereby, the claw portion 55 restricts the rotation of the date star wheel 34. On the other hand, when the date jumper 35 swings in the CW direction about the swing shaft O3, the claw portion 55 retreats from the trough portion 52 of the date star wheel 34, and the engagement between the claw portion 55 and the tooth portion 51 is released. Thereby, the claw portion 55 allows the date star wheel 34 to rotate.

In this way, the date jumper 35 of the present embodiment has the jump regulating portion 54 and the claw portion 55 integrally formed on the lever portion 53 at portions on both sides with the swing shaft O3 interposed therebetween. Therefore, when one of the jumping limit portions 54 and the claw portion 55 approaches the center axis O1, the other swings integrally so as to be away from the center axis O1. In this case, when the jump regulating portion 54 is at the seating position, the claw portion 55 is positioned radially outward of the outermost peripheral portion of the date star wheel 34, and the engagement between the claw portion 55 and the tooth portion 51 is released. On the other hand, the claw portion 55 is set to: when the apex of the jump regulating portion 54 moves to a position radially outward of the outermost peripheral portion of the date star wheel 34 (outward of the release position) in the CCW direction about the swing axis O3 of the date jumper 35, the pawl 55 comes into contact with the tooth portion 51. The outermost peripheral portion of the date star wheel 34 is a radial position at the apex of the tooth portion 51.

As shown in fig. 2, the date jumper spring 36 is configured to be elastically deformable in the in-plane direction perpendicular to the swing axis O3. Specifically, the base end portion of the date jumper spring 36 is fixed to the main plate 21. On the other hand, a distal end portion of the date jumper spring 36 is set as a free end. The distal end portion of the date jumper spring 36 abuts on the 1 st arm 62 from the opposite side of the center axis O1 so as to sandwich the date jumper 35 with the center axis O1. The date jumper spring 36 biases the date jumper 35 in the CW direction around the swing shaft O3. The date jumper spring 36 may be configured to bias the date jumper 35 in the CW direction about the swing shaft O3, and the contact position with the date jumper 35 may be appropriately changed. In this case, for example, the 2 nd arm 63 may be biased in a direction away from the center axis O1.

[ operating method of calendar mechanism ]

Next, a method of operating the calendar mechanism 31 will be described.

First, a normal date feeding operation will be described. In the following description, the initial state when the jump limiter 54 is at the seated position will be described. That is, in the initial state, the jump regulating portion 54 enters the valley portion 52 of the date star wheel 34, and the

inclined surfaces

54a and 54b engage with the tooth portion 51, whereby the rotation of the date star wheel 34 is regulated. In addition, a chain line L in the figure indicates a reference position in the circumferential direction in the initial state.

As shown in fig. 2, in the timepiece 1 of the present embodiment, the rotational force of the barrel wheel 23 is transmitted to the hour wheel 25 via the front side gear train 22. The rotational force transmitted to the hour wheel 25 is transmitted to the day change wheel 33 (day change gear portion 44) via the day change intermediate wheel 32. Thereby, the day-change wheel 33 rotates 1 turn every 24 hours in the CCW direction around the rotation axis O2.

As the date changing wheel 33 rotates, the date feeding claw 45 of the date changing wheel 33 approaches the tooth portion 51 of the date star wheel 34. Then, at the time of 0 am, the date feed pawl 45 engages with the tooth portion 51 of the date star wheel 34, and rotates the date star wheel 34 by 1 tooth in the CW direction about the center axis O1.

Fig. 4 and 5 are operation explanatory diagrams for explaining the date feeding operation of the calendar mechanism 31.

As shown in fig. 3 and 4, when the date star wheel 34 starts rotating in the CW direction, the tooth portion 51 of the date star wheel 34 slides on the front inclined surface 54b of the jump regulating portion 54. Thereby, the jump regulating portion 54 moves radially outward (in a direction away from the center axis O1). That is, the date jumper 35 swings in the CCW direction by the date jumper restricting portion 54 being pushed up by the tooth portion 51 of the date star wheel 34 against the urging force of the date jumper spring 36. As a result, as shown in fig. 4, the jump regulating portion 54 moves to a release position where the engagement between the jump regulating portion 54 and the tooth portion 51 is released. Also, in the present embodiment, at the release position, the vertices of the jump regulating portion 54 and the tooth portion 51 contact each other. On the other hand, in the released state, although the claw portions 55 enter the valley portions 52 of the date star wheel 34, a gap is provided between the claw portions 55 and the tooth portions 51. That is, in the released state, the pawl 55 is not in contact with the tooth 51.

As shown in fig. 5, when the date star 34 further rotates in the CW direction, the apex of the jump limiting portion 54 passes over the apex of the tooth portion 51. Thus, the date jumper 35 swings in the CW direction by the urging force of the jumper spring 36. Specifically, the back inclined surface 54a slides on the tooth 51, and the jump regulating portion 54 of the date jumper 35 moves radially inward (toward the central axis O1). Thereby, the date star wheel 34 is pushed in the CW direction by the skip regulation section 54 and is returned to the seating position again. Then, by rotating the date star wheel 34 by 1 tooth, the date hand 6 is rotated by 1 day. With the above, the date feeding operation is completed.

Next, a description will be given of the flying-hand suppressing operation in the case where an external force such as a drop impact acts on the timepiece 1. Fig. 6 is an operation explanatory diagram for explaining the flying-needle suppressing operation of the calendar mechanism 31.

As shown in fig. 3 and 6, when an external force acts on the timepiece 1, for example, there are cases where: the date star wheel 34 rotates in the CW direction due to the inertia of the date hand 6. In this case, the date jumper 35 swings in the CCW direction in the same manner as the date feeding operation described above, and the skip regulation unit 54 moves to the release position. In this state, the date star wheel 34 attempts to rotate further (for example, by 1 tooth or more) in the CW direction before the date jumper 35 returns to the seating position. Thereby, as shown in fig. 6, the apex of the jump regulating portion 54 is separated from the apex of the tooth portion 51.

Here, in the present embodiment, in the release position, the claw portions 55 enter the valley portions 52 of the date star wheel 34. Therefore, if the date star wheel 34 attempts to rotate in the CW direction before the date positioning lever 35 returns to the seated position, the tooth portion 51 contacts the front inclined surface 55b of the pawl portion 55 in the circumferential direction. Thereby, excessive (for example, 1 tooth or more) rotation of the date star wheel 34 in the CW direction is restricted. Then, the date jumper 35 swings in the CW direction by the urging force of the date jumper spring 36. Thus, the claw portion 55 is retracted from the valley portion 52 of the date star wheel 34, as in the above-described date feeding operation. Further, the jump regulating portion 54 enters the valley portion 52 of the date star wheel 34 and engages with the tooth portion 51. As a result, the jump regulating portion 54 is in the seating position described above.

Fig. 7 is an operation explanatory diagram for explaining the flying-needle suppressing operation of the calendar mechanism 31.

As shown in fig. 7, even when the date star wheel 34 attempts to rotate in the CCW direction by an external force, the excessive rotation of the date star wheel 34 is suppressed by the same operation as the above-described flying-needle suppressing operation. That is, when the date star wheel 34 rotates in the CCW direction, the tooth portion 51 of the date star wheel 34 slides on the back inclined surface 54a of the date restricting portion 54, and the date restricting portion 54 of the date jumper 35 moves to the release position. In this state, the claw portions 55 enter the valley portions 52 of the date star wheel 34. Therefore, when the date star wheel 34 attempts to rotate further in the CCW direction, the back inclined surface 55a of the pawl 55 comes into contact with the tooth portion 51. Thereby, further rotation of the date star wheel 34 is restricted. Thereafter, the date jumper 35 swings in the CW direction by the urging force of the date jumper spring 36, whereby the claw portion 55 retreats from the trough portion 52 of the date star wheel 34, and the jump regulating portion 54 is set to the above-described seating position.

As described above, in the present embodiment, the configuration is such that: the date star wheel 34 is provided with a pawl 55, the pawl 55 is swingable around a swing axis O3 integrally with the date restricting portion 54 and is contactable with the date star wheel 34, and the date restricting portion 54 and the pawl 55 are swingable so that when either one of them approaches the center axis O1, the other moves away from the center axis O1.

With this configuration, the claw portion 55 approaches the center axis O1 in accordance with the distance by which the jump regulating portion 54 is separated from the center axis O1. Therefore, when the date star wheel 34 rotates more than expected due to the influence of the external force and the jump regulating portion 54 is pushed out greatly from the date star wheel 34, the claw portion 55 can be brought into contact with the date star wheel 34. This can suppress excessive rotation (for example, by 2 teeth or more) of the date star wheel 34, and can suppress the flying of the date hand 6 within 1 day.

Further, as compared with the configuration in which the biasing force of the date jumper spring 36 is increased in order to suppress the movement of the jump regulating portion 54 to the release position by the external force, it is possible to suppress an increase in the load applied to the date jumper 35 or the date star wheel 34. This can suppress the date star wheel 34 from rotating excessively while maintaining durability.

In the present embodiment, the following configuration is provided: when the apex of the jump regulating portion 54 moves to a position radially outward of the outermost peripheral portion of the date star wheel 34 in the CCW direction of the date jumper 35, the claw portion 55 comes into contact with the tooth portion 51.

With this configuration, the claw portion 55 can be prevented from coming into contact with the tooth portion 51 during a normal date feeding operation. This prevents a load from being applied to the claw portion 55 and the date star wheel 34 during the date feeding operation. As a result, the date star wheel 34 can be smoothly rotated, and the claw portions 55 and the date star wheel 34 can be prevented from being deteriorated in durability.

In the present embodiment, since the claw portions 55 are formed so as to be able to enter the valley portions 52 of the date star wheel 34, the claw portions 55 and the tooth portions 51 can be brought into contact with each other in the rotation direction (circumferential direction) of the date star wheel 34. This can reliably restrict the date star wheel 34 from rotating excessively.

In the present embodiment, since the claw portions 55 are formed in a tapered shape that tapers toward the distal end portions, the claw portions 55 easily enter the valley portions 52 of the date star wheel 34. Thus, when the date star wheel 34 attempts to rotate excessively, the claw portion 55 can be reliably brought into contact with the tooth portion 51 of the date star wheel 34.

Further, since the tooth portion 51 is easily brought into sliding contact with the

inclined surfaces

55a and 55b of the claw portion 55, the claw portion 55 can be pushed out radially outward by the rotation of the date star wheel 34. This allows the jump regulating portion 54 to be quickly returned to the seating position.

In the present embodiment, since the date jumper spring 36 biases the date jumper restriction portion 54 toward the date star wheel 34 (the center axis O1), even if the date jumper restriction portion 54 is pushed out to the release position by the date star wheel 34, it is possible to quickly return to the seating position. This can suppress the date star wheel 34 from rotating excessively.

Further, since the movement 10 and the timepiece 1 according to the present embodiment have the above-described configurations, the movement 10 and the timepiece 1 having excellent operability and reliability can be provided.

(modification example)

Next, a modified example of the present embodiment will be described. In the above-described embodiment, the case where the claw portion 55 is formed in the triangular shape has been described, but the shape of the claw portion may be appropriately changed. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

Fig. 8 is a plan view of a calendar mechanism 31 according to a modification.

For example, as in date jumper 101 shown in fig. 8, claw portion 110 may be formed in a trapezoidal shape in a plan view. Specifically, the pawl portion 110 includes: a back inclined surface 110a and a front inclined surface 110 b; and a connection surface 110c connecting the

inclined surfaces

110a and 110 b. The claw portion 110 is formed to have a size such that the entire claw portion can enter the valley portion 52 of the date star wheel 34.

According to this structure, the entirety of the pawl portion 110 enters the valley portion 52, and therefore, the gap between the pawl portion 110 and the adjacent tooth portion 51 can be reduced. Thus, when the date star wheel 34 is rotated beyond expectation, the rotation of the date star wheel 34 is easily stopped at a predetermined position. As a result, when the jump regulator 54 returns to the seating position, the jump regulator 54 can be reliably inserted into the valley portion 52 of the date star wheel 34.

Fig. 9 is a plan view of a calendar mechanism 31 according to a modification.

The claw portion 121 of the date positioning lever 120 shown in fig. 9 has a recessed portion 121a capable of receiving the tooth portion 51 of the date star wheel 34. The recess 121a is recessed radially outward from the distal end surface of the claw 121. The inner surface shape of the recess 121a in plan view is formed to correspond to the outer surface shape of the tooth portion 51.

According to this configuration, the tooth portion 51 is accommodated in the recess 121a of the pawl portion 121, and therefore, when the date star wheel 34 is rotated beyond expectation, the rotation of the date star wheel 34 is easily stopped at a predetermined position. As a result, when the jump regulator 54 returns to the seating position, the jump regulator 54 can be reliably inserted into the valley portion 52 of the date star wheel 34.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be added without departing from the spirit of the present invention.

For example, in the above-described embodiment, the case where the present invention is applied to the mechanical timepiece 1 has been described, but the present invention is not limited to this, and the present invention may be applied to an analog quartz timepiece.

In the above-described embodiment, the case where the present invention is applied to the jumper mechanism that executes the date feeding operation has been described, but the present invention is not limited to this, and the present invention may be applied to a jumper mechanism that executes another calendar feeding operation such as the day of the week or the month.

In the above-described embodiment, the case where the positioning lever mechanism of the present invention is applied to the timepiece 1 of the center date system has been described, but the present invention is not limited thereto. For example, the date hand 6 may be disposed at a position offset from the central axis O1.

In the above-described embodiment, the description has been given of the configuration in which the jump regulating portion 54 and the claw portion 55 are integrally formed by the lever portion 53, but the jump regulating portion 54 and the claw portion 55 may be formed separately as long as the jump regulating portion 54 and the claw portion 55 integrally swing.

In the above-described embodiment, the structure in which the claw portion 55 contacts the tooth portion 51 of the date star wheel 34 in the circumferential direction has been described, but the present invention is not limited thereto. For example, the claw portion 55 and the date star wheel 34 may be in contact with each other in the radial direction.

In the above embodiment, the following configuration is explained: when the peak of the jump regulating portion 54 moves to the radially outer side than the outermost peripheral portion of the date star wheel 34, the claw portion 55 and the tooth portion 51 come into contact with each other, but the present invention is not limited thereto. For example, a structure is also possible in which: when the jump limit portion 54 reaches the release position, the pawl portion 55 contacts the tooth portion 51.

In addition, the components in the above embodiments may be replaced with known components as appropriate within a range not departing from the gist of the present invention, and the above modifications may be combined as appropriate.

Claims

1. A positioning rod mechanism, characterized in that,

The positioning rod mechanism has:

a skip limit part, which swings around the first axis and engages with or disengages from the gear rotating about the second axis, so as to limit the rotation of the gear;

a claw part that swings about the first axis integrally with the jumping limit part and is capable of being brought into contact with the gear; and

a lever portion having a base portion fixed to the first shaft, and a first arm and a second arm extending in a bifurcated shape from the base portion,

The lever portion has the jump calendar restricting portion at the distal end portion of the first arm, and has the claw portion at the distal end portion of the second arm, when viewed from a direction along the second axis. In a plan view, the rod portion is formed in a V-shape extending toward the second axis,

The jump calendar restricting portion is urged toward the gear,

When either one of the jump-history restricting portion and the claw portion approaches the gear, the other moves away from the gear.

2. The positioning rod mechanism according to claim 1, characterized in that,

The claw portion is brought into contact with the gear when the jump calendar restricting portion moves to a position radially outward of the outermost peripheral portion of the gear in the radial direction perpendicular to the second axis.

3. The positioning rod mechanism according to claim 1 or claim 2, characterized in that,

The claw portion is formed so as to be able to enter between adjacent tooth portions of the gear.

4. The positioning rod mechanism according to claim 1 or claim 2, characterized in that,

The claw portion has a concave portion capable of accommodating the tooth portion of the gear.

5. The positioning rod mechanism according to claim 1 or claim 2, wherein,

The claw portion is formed in a tapered shape whose width decreases toward the distal end portion in a plan view viewed from the axial direction of the first shaft.

6. The positioning rod mechanism according to claim 1 or claim 2, wherein,

The detent lever mechanism includes a detent lever spring that urges the jump-history restricting portion toward the gear.

7. A movement, characterized in that,

The movement includes the positioning lever mechanism according to any one of claims 1 to 6 .

8. A timepiece, characterized in that,

The said timepiece is equipped with the movement of Claim 7.