CN107045276B

CN107045276B - Calendar mechanism, movement, and timepiece

Info

Publication number: CN107045276B
Application number: CN201710069261.2A
Authority: CN
Inventors: 铃木重男
Original assignee: Seiko Instruments Inc
Current assignee: Seiko Instruments Inc
Priority date: 2016-02-09
Filing date: 2017-02-08
Publication date: 2020-03-27
Anticipated expiration: 2037-02-08
Also published as: JP6636815B2; JP2017142134A; CH712123A2; CN107045276A; CH712123B1

Abstract

The invention provides a calendar mechanism, a movement and a timepiece, wherein the calendar mechanism can be easily manufactured with a simple structure. The calendar mechanism is provided with: a date wheel with a 30-day judging part; a month wheel that rotates one revolution a year; a main date changing mechanism; and a moonlet date changing mechanism that rotates the date wheel on the last day of the moonlet. The month wheel has a month cam having a recess corresponding to a small month formed on an outer peripheral surface thereof, the main date changing mechanism has a date changing wheel and a date feeding claw wheel, and the small month date changing mechanism has an operation lever, a small month date feeding claw wheel, and a date changing intermediate wheel, and by causing the 30 th date judging lever to follow the 30 th date judging section and causing the small month judging lever to follow the recess, the operation lever is rotated from a first position toward a second position, and the date changing intermediate wheel is separated from the date feeding claw wheel when the operation lever is at the first position and is engaged with the date feeding claw wheel when the operation lever is at the second position.

Description

Calendar mechanism, movement, and timepiece

Technical Field

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

Background

In a timepiece with a calendar capable of displaying the date of a month, there is known a calendar mechanism including: at the end of a short month, in which the number of days of one month is 30 days or less, date feed is performed by two days, thereby suppressing date correction to a minimum (see, for example, patent document 1).

Patent document 1 describes a calendar mechanism including: a date dial (date wheel) provided with a 1 st inner tooth row and a 2 nd inner tooth row; a date moving wheel group having a hook claw driven via the teeth of the 1 st inner tooth row for controlling date display; a correction movable wheel set which works together with the 2 nd inner gear train and enables the date disc to be fed one more step at the end of the month; and a month moving wheel group which drives the month star wheel at the end of each month. The rod body is provided with: a lever controlled by the peg of the date disc; a 1 st sliding rod for actuating the date wheel set and the month wheel set; a 2 nd slide bar for actuating the correction sheave group; and a lever cooperating with the month star wheel to control the rotation of the 2 nd slide lever.

Patent document 1: japanese patent No. 5105467

However, in the conventional technique, the number of the rods is corrected, the structure is complicated, and the cost may be increased. Further, in order to cause the respective levers to be interlocked at a predetermined timing, it is necessary to assemble the levers in a state in which the positions of the respective levers are aligned with a predetermined position, and there is a possibility that the manufacturing process becomes complicated.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a calendar mechanism, a movement, and a timepiece, which can be easily manufactured with a simple structure.

In order to solve the above problem, a calendar mechanism according to the present invention includes: a month wheel, which rotates one turn a year; a date wheel that rotates one month and has a 30-day determination section at a predetermined position in the circumferential direction; a main day-changing mechanism that rotates the date wheel one day; and a month change mechanism that rotates the date wheel on the last day of a month with a number of days of one month of 30 days or less, the month wheel having a month cam having a month determination unit formed on an outer circumferential surface thereof, the month determination unit corresponding to the month, the main change mechanism including: an operation cam that rotates once a day and is stacked on a day change wheel that rotates once a day at a constant speed; and a date feed claw wheel which rotates in synchronization with the operation cam to rotate the date wheel, wherein the moonlet date change mechanism includes: a movement lever body which rotates around a predetermined axis and is provided with a 30-day determination lever capable of following the 30-day determination unit and a shorter month determination lever capable of following the shorter month determination unit; a moonlet date feeding claw wheel that rotates the date wheel on the last day of the moonlet; and a date change intermediate wheel provided so as to be rotatable with respect to the operation lever body in a state of being engaged with the date feed claw wheel for a shorter month, the operation lever body being rotated from a first position toward a second position by causing the date determination lever 30 to follow the date determination unit and causing the month determination lever to follow the month determination unit, the date change intermediate wheel being separated from the date feed claw wheel when the operation lever body is at the first position and being engaged with the date feed claw wheel when the operation lever body is at the second position.

According to the present invention, since the calendar mechanism can be operated by the operating lever body, the number of parts can be reduced and the calendar mechanism can be formed in a simple configuration as compared with the conventional technique including 4 levers.

Further, since the 30-day determination lever and the shorter-month determination lever are provided on the operation lever body, the 30-day determination lever and the shorter-month determination lever can be arranged at predetermined positions only by assembling the operation lever body. That is, since it is not necessary to separately align the 30-day determination lever and the moonlet determination lever, the manufacturing can be easily performed.

Further, by making the 30-day determination lever follow the 30-day determination unit and making the shorter-month determination lever follow the shorter-month determination unit, the operation lever body is rotated from the first position to the second position, and when the operation lever body is at the second position, the date change intermediate wheel is engaged with the date feed claw wheel, and therefore, the power of the date feed claw wheel can be transmitted to the shorter-month date feed claw wheel via the date change intermediate wheel. Therefore, the date can be fed correctly by rotating the date wheel by the date feeding claw wheel and the date feeding claw wheel of the shorter month on the last day of the shorter month.

Further, the main date change mechanism includes a control cam that rotates in synchronization with the operation cam and has a date feed determination unit on an outer peripheral surface, the operation lever body has a date feed determination lever that is in sliding contact with an outer peripheral surface of the control cam, and the 30-day determination lever follows the 30-day determination unit and the shorter month determination lever follows the shorter month determination unit when the date feed determination lever is in sliding contact with the date feed determination unit.

According to the present invention, since the operation lever body has the date feed determination lever which is in sliding contact with the outer peripheral surface of the control cam, the 30-day determination lever can follow the 30-day determination unit without contacting the date wheel. This can suppress the occurrence of a load on the date indicator from the operating lever, and thus can prevent the date indicator from shifting and display the date at a predetermined position.

Further, the moonlet date changing mechanism includes a biasing member that biases the moonlet date feed claw wheel from a pre-feed position before rotating the date wheel to a post-feed position after rotating the date wheel.

According to the present invention, the date wheel for shorter months can be returned to the position before feeding after rotating the date wheel in shorter months. Therefore, the date can be correctly fed even in the next month.

Further, the moonlet date feed claw wheel includes a moonlet date feed claw that presses a tooth portion of the date wheel to rotate the date wheel, and the moonlet date feed claw wheel includes an elastic support portion that elastically supports the moonlet date feed claw: the date of moonlight feed claw is movable toward a radial inside of the date of moonlight feed claw wheel when moving from the post-feed position toward the pre-feed position and abutting against the tooth portion.

According to the present invention, since the date indicator is provided with the elastic support portion which elastically supports the date indicator feeding claw to be movable toward the inside in the radial direction of the date indicator feeding claw wheel, the date wheel can be reliably prevented from rotating reversely when the date indicator feeding claw is returned from the post-feeding position toward the pre-feeding position. Therefore, the date can be fed correctly by rotating the date wheel by the date feeding claw wheel and the date feeding claw wheel of the shorter month on the last day of the shorter month.

The movement of the present invention is characterized by including the calendar mechanism described above.

A timepiece of the present invention includes the movement described above.

According to the present invention, since the calendar mechanism which has a simple structure and can be easily manufactured is provided, a highly reliable and low-cost movement and timepiece can be realized.

Drawings

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

Fig. 2 is a plan view of the movement provided with the calendar mechanism.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a sectional view taken along line B-B of fig. 2.

Fig. 5 is an enlarged plan view of the main day-changing mechanism.

Fig. 6 is an enlarged plan view of the 30-day determination lever and the shorter date feed pawl wheel.

Fig. 7 is a plan view showing the 23 hour and 50 minute time of the last day in the date feed of the shorter month.

Fig. 8 is a plan view showing the 23-hour and 55-minute time of the last day in the date feed of the shorter month.

Fig. 9 is a block diagram showing a power transmission path in the calendar mechanism.

Fig. 10 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the shorter month, and is a view showing a state where one date feeding is started.

Fig. 11 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feed of the month, and is a diagram of a state in the middle of one date feed.

Fig. 12 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the shorter month, and is a view showing a state in which one date feeding is ended.

Fig. 13 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the shorter month, and is a view showing a state where the second date feeding is started.

Fig. 14 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feed of the shorter month, and is a diagram of a halfway state of the secondary date feed.

Fig. 15 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the shorter month, and is a diagram of a state in which the secondary date feeding is ended.

Fig. 16 is a plan view showing the time of 23 hours and 50 minutes of 30 days in date feeding of a large month.

Fig. 17 is a plan view showing the time of 24 hours and 00 minutes of 30 days in date feeding of a large month, and is a diagram of a state in the middle of the secondary date feeding.

Fig. 18 is a plan view showing the time of 24 hours 00 minutes of 30 days in date feeding of a large month, and is a diagram of a state in which the date feeding is ended.

Fig. 19 is a plan view of a movement provided with a calendar mechanism according to a modification.

Fig. 20 is a sectional view taken along line C-C of fig. 19.

Fig. 21 is a plan view showing the time of 00 hours and 00 minutes of the last day in the date feed of the shorter month.

Fig. 22 is a plan view showing the time of 5 hours and 55 minutes of the last day in the date feed of the shorter month.

Fig. 23 is a plan view showing the time of 24 hours 00 minutes on the last day in the date feed of the shorter month, and is a view of a state immediately before one date feed is started.

Fig. 24 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the month, and is a view showing a state where one date feeding is started.

Fig. 25 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feed of the month, and is a view showing a state in the middle of one date feed.

Fig. 26 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the shorter month, and is a diagram of a state in which the secondary date feeding is started.

Fig. 27 is a plan view showing the time of 24 hours 00 minutes of the last day in the date feeding of the shorter month, and is a diagram of a state in which the date feeding is ended.

Fig. 28 is an explanatory diagram of date feeding for the month of dawn.

Fig. 29 is an explanatory diagram of a control cam according to another embodiment.

Fig. 30 is an external view of a timepiece according to another embodiment.

Fig. 31 is a cross-sectional view of the movement of the timepiece according to the other embodiment shown in fig. 30.

Description of the reference symbols

1: a timepiece; 20: a date wheel; 30: a month wheel; 33: a moon cam; 34 b: a concave portion (a moon determination unit); 40: a main date changing mechanism; 43: a day changing wheel; 45: a control cam; 46: a date feeding determination unit; 47: a date feed dog wheel; 50: an action cam; 70: a moonlet date changing mechanism; 71: an action rod body; 73: a date feed determination lever; 74: a 30 day decision lever; 75: a moonlet decision lever; 76: a moonlet date feeding claw wheel; 79 b: a date of moonlet feeding claw; 79 c: an elastic support portion; 82: a return spring (urging member); 85: a middle wheel for changing days; 100: a calendar mechanism; c2: second axis (defined axis).

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Hereinafter, a mechanical wristwatch (corresponding to a "timepiece" in the claims, and hereinafter simply referred to as a "timepiece") will be described, and then details of a calendar mechanism according to an embodiment will be described.

(watch)

In general, a mechanical body including a drive portion of a timepiece is referred to as a "movement". The state in which the dial and the hands are mounted on the movement and then put into the timepiece case to be formed into a finished product is referred to as a "finished product" of the timepiece. Of the two sides of the main plate constituting the timepiece substrate, the side on which the glass of the timepiece case is present, that is, the side on which the dial is present, is referred to as the "back side" of the movement. Of the two sides of the main plate, the side on which the case back cover of the timepiece case is present, that is, the side opposite to the dial, is referred to as the "front side" of the movement.

Fig. 1 is an external view of a timepiece 1 according to an embodiment. In the following description, the clockwise direction in each of the top views shown in fig. 1 and later is referred to as the CW direction, and the counterclockwise direction is referred to as the CCW direction.

As shown in fig. 1, the finished timepiece 1 of the present embodiment includes, in a timepiece case 3 including a case back cover and a glass 2, not shown: a movement 10; a dial 11 having scales or the like indicating information related to hours; and hands including an hour hand 12 indicating hours, a minute hand 13 indicating minutes, and a second hand 14 indicating seconds. The dial 11 is opened with: a day window 11a for exposing the number indicating the date; and a month window 11b for exposing the letters indicating the month. This enables the timepiece 1 to show the time, date, and month.

Fig. 2 is a plan view of a movement provided with a calendar mechanism, and fig. 3 is a sectional view taken along line a-a of fig. 2.

As shown in fig. 2 and 3, the movement 10 has a main plate 5 constituting a base plate of the movement 10. As shown in fig. 3, at least: an escape speed limiting mechanism, not shown, including a balance, an escape wheel, a pallet fork, and the like; and a front side wheel train including a fourth wheel 8, a third wheel, a second wheel 9, a barrel wheel and the like. A second hand 14 is attached to the end portion on the back side of the fourth wheel 8, and the second hand 14 rotates once every 60 seconds in the CW direction about the center axis O. A minute hand 13 is attached to the end portion on the back side of the second wheel 9, and the minute hand 13 rotates once in the CW direction every 60 minutes around the center axis O.

(calendar mechanism)

As shown in fig. 2 and 3, the calendar mechanism 100 includes an hour wheel 16, a date wheel 20, a month wheel 30, a main date change mechanism 40, and a small month date change mechanism 70. The calendar mechanism 100 will be described in detail below with reference to the drawings.

In the following description, months with a month of 30 or less days (2, 4, 6, 9, and 11 months) are referred to as juveniles, and months with a month of 31 days (1, 3, 5, 7, 8, 10, and 12 months) are referred to as juveniles.

The front end of the hour wheel 16 serves as an hour gear 16 a. The hour wheel 16 is engaged with a barrel wheel, not shown, as a power source via an hour gear 16a and a train wheel. The hour wheel 16 is rotated by power transmitted from the barrel wheel. An hour hand 12 is attached to the end portion on the back side of the hour wheel 16, and the hour hand 12 rotates once in the CW direction every 12 hours around the center axis O. The hour wheel 16 has an hour intermediate wheel 16b at the back face side than the hour gear 16 a. The rotation of the hour wheel 16 is transmitted to a main day-changing mechanism 40 described later via a gear train such as an hour intermediate wheel 16b or an intermediate wheel 17.

The date wheel 20 is an annular member rotatably mounted on the main plate 5. As shown in fig. 2, date characters 21 indicating 1 to 31 days are sequentially displayed on the surface of the date wheel 20 along the circumferential direction. Examples of the display method of the date characters 21 include printing, embossing, sealing and pasting, but are not particularly limited. The date wheel 20 rotates in the CW direction. The date characters 21 are sequentially displayed in accordance with the rotation direction of the date wheel 20.

The inner peripheral surface 20a of the date wheel 20 is formed in two steps. On the front surface side of the movement 10 on the inner peripheral surface 20a of the date wheel 20, a plurality of teeth 22 are formed so as to protrude radially inward and to be spaced apart in the circumferential direction. The teeth 22 are formed with 31 teeth at a pitch of about 11.6 ° at 360 °/31 corresponding to 31 days, which is one month of the month. The tooth portion 22 is pressed once a day by a date feed pawl 47b of a date feed pawl wheel 47, which will be described later, that rotates once a day. Thereby, the date wheel 20 rotates in the CW direction and rotates once a month.

The date jumper 25 regulates the position of the date wheel 20 in the rotational direction and assists the rotation of the date wheel 20. The base end portion of the date jumper 25 is fixed to the main plate 5, and the tip end portion 25a is a free end. The date positioning lever 25 includes an elastically deformable day arm portion 25 b. The sun arm portion 25b urges the distal end portion 25a toward the sun wheel 20. The rotation of the date indicator 20 is restricted by the engagement of the tip end portion 25a of the date indicator 25 with the tooth portion 22 of the date indicator 20. The date wheel 20 can thereby be rotated step by step at the same angular pitch as the pitch angle of the tooth 22 (approximately 11.6 °).

On the inner peripheral surface 20a of the date wheel 20 and at the back surface side than the tooth portion 22, a month feeding portion 26 is formed. The month feed portion 26 is formed to project toward the radially inner side. When switching from the last day of the month to the first day of the following month, the month feed portion 26 pushes the tooth 28a of the month intermediate wheel 28 provided on the inner side of the date wheel 20, rotating the month intermediate wheel 28.

Further, a 30-day determination unit 29 is formed on the inner peripheral surface 20a of the date wheel 20 on the side of the back surface of the tooth portion 22. The 30-day determination unit 29 is formed to be recessed radially outward. The 30-day determination unit 29 is formed at a position corresponding to a distal end portion 74a of a 30-day determination lever 74, which will be described later, provided inside the date indicator 20 when the date indicator 20 indicates 30 days. When switching from the last day of the shorter month, that is, 30 days, to the first day of the next month, the distal end portion 74a of the 30-day determination lever 74 enters the 30-day determination unit 29 and can follow the 30-day determination unit 29.

(month wheel)

The month wheel 30 is freely rotatably inserted loosely into the hour wheel 16. The month wheel 30 has a month gear 31 and a month cam 33. The month wheel 30 rotates one turn a year.

The month gear 31 meshes with the month intermediate wheel 28. The month gear 31 has 12 teeth formed at a pitch of 30 ° to 360 °/12 corresponding to 12 months, which is the number of months in one year. The month gear 31 rotates with the rotation of the date wheel 20 and the month intermediate wheel 28 on the last day of each month. In fig. 2, for easy understanding, the numbers of months corresponding to the respective teeth of the month gear 31 are described.

The month cam 33 rotates one revolution per year around the center axis O in synchronization with the month gear 31. On the outer peripheral surface of the

month cam

33, 5

convex portions

34a and 5 concave portions 34b located between the convex portions 34a are formed in the circumferential direction (corresponding to a "month determination portion" in the claims).

The plurality of convex portions 34a of the month cam 33 are formed at positions corresponding to major months (1 month, 3 months, 5 months, 7 months, 8 months, 10 months, and 12 months) when the outer peripheral surface 12 of the month cam 33 is equally divided at a pitch of 30 ° around the central axis O and sequentially distributed from 1 month to 12 months in the CW direction. In addition, the plurality of concave portions 34b of the month cam 33 are formed at positions corresponding to the shorter months (months 2, months 4, months 6, months 9 and months 11).

A month display plate 15 is fitted and fixed to the rear end of the month wheel 30. The month display plate 15 is a disk-shaped plate member and is disposed on the front surface side of the movement 10 with respect to the dial 11. As shown in fig. 2, on the main surface of the date indicator 20, month characters 15a indicating 1 month (JAN) to 12 months (DEC) are sequentially displayed in the circumferential direction. Examples of the display method of the month characters 15a include printing, embossing, and sealing, but are not particularly limited. The month display plate 15 makes one rotation in the CCW direction for one year around the center axis O in synchronization with the month gear 31 and the month cam 33. The month letters 15a are sequentially displayed in accordance with the rotation direction of the month display plate 15, and are exposed to the outside from the month window 11 b.

The month jumper 35 restricts the position of the month wheel 30 in the rotational direction, and assists the rotation of the month wheel 30. The proximal end portion of the month positioning rod 35 is rotatably connected to the main plate 5, and the distal end portion 35a is a free end. The tip end portion 35a of the month positioning lever 35 is urged toward the month wheel 30 by the month positioning lever spring 36. The distal end portion 35a of the month jumper 35 engages with the teeth of the month wheel 30, thereby restricting the rotation of the month wheel 30. Thereby, the month gear 31, the month cam 33, and the month display plate 15 of the month wheel 30 are rotated in the CCW direction one step by one month at a pitch of 30 ° which is the same as the pitch angle (30 °) of the teeth around the central axis O, thereby rotating one revolution per year.

(Main day-changing mechanism)

Fig. 4 is a sectional view taken along line B-B of fig. 2, and fig. 5 is an enlarged plan view of the main day-changing mechanism.

As shown in fig. 2, 4 and 5, the shaft member 6 is provided upright from the main plate 5 along the first axis C1 at a position corresponding to the 5O' clock direction between the center axis O and the inner peripheral surface 20a of the date wheel 20. The main day-changing mechanism 40 is supported by the shaft member 6 to be rotatable about the first shaft C1.

The main day changing mechanism 40 includes a day changing pin 41, a day changing wheel 43, an operating cam 50, an operating cam lever 52, a date feed claw wheel 47, and a control cam 45. The date changing pin 41, the date changing wheel 43, the operating cam 50, the date feed pawl wheel 47, and the control cam 45 are disposed on the same axis with the first shaft C1 as the rotation center.

The solar control pin 41 is formed in a tubular shape, and is loosely inserted into the shaft member 6 so as to be rotatable about the first shaft C1.

The day hand wheel 43 is freely rotatably inserted into the day hand pin 41. The day-changing wheel 43 meshes with the intermediate wheel 17. The power of the hour wheel 16 is transmitted to the day drive wheel 43 via the hour intermediate wheel 16b and the intermediate wheel 17. The day-changing wheel 43 rotates one revolution a day at a fixed speed about the first shaft C1.

The day hand wheel 43 is provided with an arc-shaped groove portion 43a, and the groove portion 43a has a width in the radial direction of the day hand wheel 43 with the first shaft C1 as the center in plan view. The center angle of the arc-shaped groove portion 43a is, for example, about 90 °.

The operating cam 50 is a plate-like member formed in a fan shape as a whole, and is smaller than the outer shape of the day-shift wheel 43. The operation cam 50 is laminated on the day hand wheel 43 on the front side of the day hand wheel 43. The operating cam 50 is fitted and fixed to the sun shift pin 41. Thereby, the operating cam 50 is rotatable about the first shaft C1 with respect to the day drive pulley 43.

The operating cam 50 includes: an arc-shaped operating cam surface 50 a; a pressing surface 50b pressed by an operation cam lever 52 described later; and a bulging portion 50c that enters the distal end portion 53 of the operation cam lever 52. The operating cam surface 50a is formed such that: the radius gradually decreases toward the CW direction. The pressing surface 50b is provided at one end of the operating cam surface 50a so as to face in the CCW direction. The bulging portion 50C is provided on the radially opposite side of the operating cam surface 50a with the first shaft C1 therebetween, and bulges radially outward.

The operation cam 50 includes a limit pin portion 51, and the limit pin portion 51 protrudes toward the back surface side of the movement 10 in the axial direction. The regulating pin portion 51 is inserted into the groove portion 43a of the day-change wheel 43. The diameter of the restricting pin portion 51 is smaller than the width of the groove portion 43a, so that the restricting pin portion 51 is loosely inserted into the groove portion 43a and can move in the circumferential direction within the groove portion 43 a.

By rotating the day-shift wheel 43 in the CW direction, the regulating pin portion 51 abuts on the end of the groove portion 43a in the CCW direction. By rotating the day-shift wheel 43 in the CW direction with the regulating pin portion 51 abutting against the end of the groove portion 43a, the operation cam 50 can be rotated in the CW direction together with the day-shift wheel 43.

When the pressing surface 50b of the operating cam 50 is pressed by an operating cam lever 52, which will be described later, the restricting pin portion 51 moves in the groove portion 43a in the CW direction at a speed higher than the rotation speed of the day-shift dial 43. Thus, the operating cam 50 can rotate in the CW direction with respect to the day shift wheel 43 at a predetermined angle (approximately 90 ° in the present embodiment) corresponding to the formation range of the groove portion 43 a.

The operation cam lever 52 is formed in an L shape as a whole. The operation cam lever 52 is pivotally supported by the main plate 5 so as to be rotatable. The operation cam lever 52 is biased by an operation cam lever spring 54 so that the distal end portion 53 faces the operation cam 50. The distal end portion 53 of the operating cam lever 52 is in sliding contact with the operating cam surface 50a and the pressing surface 50b of the operating cam 50, and approaches or separates from the first shaft C1, which is the rotation center of the operating cam 50, as the operating cam lever 52 rotates.

The distal end portion 53 of the operating cam rod 52 is formed with: a first convex portion 53a protruding toward the operating cam 50; and a second projection 53b provided closer to the base end side of the operating cam lever 52 than the first projection 53 a. By rotating the operating cam 50 in the CW direction, the second convex portion 53b of the distal end portion 53 of the operating cam rod 52 slides on the operating cam surface 50 a. The second convex portion 53b of the distal end portion 53 of the operating cam lever 52 reaches the pressing surface 50b of the operating cam 50 at a predetermined timing before and after 0 am of the switching date, and presses the pressing surface 50b by the biasing force of the operating cam lever spring 54. Thus, the operating cam 50 can instantaneously rotate in the CW direction with respect to the day shift wheel 43 at a predetermined angle (approximately 90 ° in the present embodiment) corresponding to the formation range of the groove portion 43a of the day shift wheel 43. After the operating cam 50 has rotated by a predetermined angle, the bulging portion 50c enters between the first convex portion 53a and the second convex portion 53b of the operating cam lever 52, and the operating cam 50 is temporarily held.

The date feed pawl wheel 47 is constituted by a disk-shaped date feed pawl gear 47a and a date feed pawl 47 b. The date feed claw wheel 47 is fitted and fixed to the rear end of the date changing pin 41, and rotates in synchronization with the operation cam 50.

The date feed pawl gear 47a is fitted and fixed to the date changing pin 41. A tooth portion is formed on the outer peripheral surface of the date feeding pawl gear 47 a. The date feed pawl gear 47a can mesh with a date change intermediate gear 85 of the month date change mechanism 70 described later.

The date feeding pawl 47b is externally fitted and fixed to the day changing pin 41 at the back surface side than the date feeding pawl gear 47 a. A claw portion 47c protruding radially outward is formed on the outer peripheral surface of the date feeding claw 47b so as to be engageable with the tooth portion 22 of the date wheel 20. The date feed claw wheel 47 rotates in synchronization with the instantaneous rotation of the operation cam 50 at a predetermined timing before and after 0 am of the switching date. Thereby, the date feed claw 47b presses the tooth portion 22 of the date indicator 20 to rotate the date indicator 20 in the CW direction by 1 step.

The control cam 45 is stacked rotatably with respect to the day drive pulley 43, and is disposed between the day drive pulley 43 and the date feed claw wheel 47. The control cam 45 is fitted and fixed to the date changing pin 41, and rotates in synchronization with the operation cam 50 and the date feed pawl wheel 47. A distal end portion 73a of a date feeding determination lever 73 provided in a month date change mechanism 70 described later is in sliding contact with an outer peripheral surface of the control cam 45.

A date feeding determination section 46 is formed on the outer peripheral surface of the control cam 45. The date feeding deciding part 46 is formed to be recessed inward in the radial direction. The side surface 46a of the date feeding determination unit 46 in the CW direction is formed along the radial direction. The date feeding determination section 46 has a side surface 46b in the CCW direction inclined from the radially inner side toward the radially outer side in the CCW direction, thereby enlarging the opening of the date feeding determination section 46. When switching from the last day of the shorter month, that is, 30 days, to the first day of the next month, the distal end portion 73a of the date feed determination lever 73 enters the date feed determination unit 46 and comes into sliding contact therewith.

(Small moon day-changing mechanism)

The shaft member 7 is provided so as to stand from the main plate 5 along a second axis C2 (corresponding to a "predetermined axis" in the claims) at a position corresponding to the 7O' clock direction between the central axis O and the inner peripheral surface 20a of the date wheel 20.

The moonlet date changing mechanism 70 includes an operation lever 71, a moonlet date feed claw wheel 76, and a date changing intermediate wheel 85.

The actuating rod 71 is a flat plate-like member made of a metal material, for example. The operation lever 71 is inserted more loosely into the cylindrical portion 77 of a month date feed pawl wheel 76, which will be described later, inserted loosely into the shaft member 7, and is supported by the shaft member 7 so as to be rotatable about a second axis C2. The actuating rod 71 is biased in the CCW direction about the second axis C2 by an actuating rod spring 72, wherein the actuating rod spring 72 is disposed radially outward of the actuating rod 71.

The operation lever 71 includes a restriction pin portion 71a, a date feed determination lever 73, a 30 day determination lever 74, and a moon determination lever 75. The date feeding judging lever 73, the 30-day judging lever 74 and the shorter month judging lever 75 are formed integrally.

The restricting pin portion 71a is provided upright near the second shaft C2 toward the rear surface side. The regulating pin portion 71a is inserted into a groove portion 78a provided in a pawl gear 78 of the month date feeding pawl wheel 76 described later, and regulates the rotation of the month date feeding pawl wheel 76.

The distal end portion 73a of the date feeding determining lever 73 is formed to be curved toward the control cam 45. The distal end portion 73a of the date feeding determination lever 73 is in contact with the outer peripheral surface of the control cam 45 by the urging force of the operating lever spring 72, and is in sliding contact with the outer peripheral surface of the control cam 45 by the rotation of the control cam 45. When switching from the last day of the shorter month, that is, 30 days, to the first day of the next month (for example, during a period from 23 hours 55 minutes to 24 hours 00 minutes on the last day of the shorter month), the distal end portion 73a of the date feed determination lever 73 enters the date feed determination portion 46 of the control cam 45 by the urging force of the operating lever spring 72 and comes into sliding contact therewith.

The distal end portion 74a of the 30-day determination lever 74 is formed so as to be curved toward the inner peripheral surface 20a of the date wheel 20. The distal end portion 74a of the 30-day determination lever 74 is separated from the inner peripheral surface 20a of the date indicator 20 by a predetermined distance. When the date indicator 20 displays 30 days, the distal end portion 74a of the 30-day determination lever 74 is disposed at a position corresponding to the 30-day determination unit 29 of the date indicator 20 (see fig. 6).

The shorter term determination lever 75 extends between the center axis O and the first axis C1 in plan view, and the tip end portion 75a is formed curved toward the shorter term cam 33. The distal end portion 75a of the shorter term determination lever 75 is separated from the outer peripheral surface of the month cam 33 by a predetermined distance. The distal end portion 75a of the shorter month determination lever 75 is disposed at a position corresponding to the convex portion 34a of each month in the longer month, and at a position corresponding to the concave portion 34b of each month in the shorter month.

Fig. 7 is a plan view showing the time of 23 hours and 50 minutes of the last day in the date feed of the shorter month, and fig. 8 is a plan view showing the time of 23 hours and 55 minutes of the last day in the date feed of the shorter month.

As shown in fig. 2, when the distal end portion 73a of the date feeding determination lever 73 is in sliding contact with the region of the control cam 45 other than the date feeding determination unit 46, the operation lever 71 is disposed at a position inclined in the CW direction about the second axis C2 against the urging force of the operation lever spring 72 (hereinafter, also referred to as "first position").

As shown in fig. 7, in the operating lever body 71, on the last day of the shorter month, that is, on 30 days, the distal end portion 75a of the shorter month determination lever 75 is disposed at a position corresponding to the concave portion 34b, and the distal end portion 74a of the 30-day determination lever 74 is disposed at a position corresponding to the 30-day determination unit 29.

As shown in fig. 8, when switching from 30 days, which is the last day of a shorter month, to the first day of the next month (for example, during a period from 23 hours 55 minutes to 24 hours 00 minutes on the last day of the shorter month), the distal end portion 73a of the date feed determination lever 73 enters the date feed determination unit 46 and comes into sliding contact therewith, the distal end portion 74a of the 30 day determination lever 74 enters the 30 day determination unit 29 and follows the same, and the distal end portion 75a of the shorter month determination lever 75 enters the concave portion 34b of the month cam 33 and follows the same. When the distal end portion 73a of the date feeding determination lever 73 enters the date feeding determination unit 46 and comes into sliding contact therewith, the operation lever 71 is disposed at a position (hereinafter referred to as "second position") inclined in the CCW direction from the first position about the second axis C2 by the biasing force of the operation lever spring 72.

As shown in fig. 6, the date of the shorter month feeding pawl wheel 76 includes a cylindrical portion 77, a pawl gear 78, a pawl plate 79, and a return spring coupling portion 80. The cylinder portion 77, the pawl gear 78, the pawl plate 79, and the return spring coupling portion 80 are integrally fixed and rotate synchronously about the second shaft C2.

The cylindrical portion 77 is rotatably inserted around the shaft member 7.

The pawl gear 78 is fitted and fixed to the tube portion 77 on the back surface side of the actuating rod 71 loosely inserted into the tube portion 77. A plurality of teeth are formed on the outer peripheral surface of the pawl gear 78 in the circumferential direction. The pawl gear 78 is provided with an arc-shaped groove portion 78a, and the groove portion 78a has a width in the radial direction of the pawl gear 78, with the second shaft C2 as the center in plan view. The center angle of the arc-shaped groove portion 78a is, for example, about 90 °. A restricting pin portion 71a provided upright from the actuating rod 71 is movably inserted into the groove portion 78 a.

The pawl plate 79 is fixed to the pawl gear 78 at the side closer to the back surface than the pawl gear 78. The claw plate 79 has a base portion 79a, a date of moonlet feeding claw 79b, and an elastic support portion 79 c.

The base portion 79a is provided to cover most of the pawl gear 78, and a pawl groove 79d is formed in the radial direction.

The shorter date feeding claw 79b is formed long in the radial direction and projects radially outward from the claw gear 78. The shorter date feeding claw 79b is oriented substantially in the 6 o' clock direction at a position before feeding (hereinafter, simply referred to as "before feeding position") before the tooth portion 22 of the date wheel 20 is pressed and rotated. The shorter date feeding claw 79b is disposed in the claw groove 79d and is movable in the radial direction. The side surface of the date feeding claw 79b on the CW side is a flat surface and can be engaged with the tooth portion 22 of the date wheel 20. Further, the side surface of the date feeding claw 79b on the CCW side is a curved surface and can be disengaged from the tooth portion 22 of the date wheel 20.

The elastic support portion 79C is formed in a C shape that is elastically deformable as a whole, and connects the base portion 79a and the moonlight date feeding claw 79 b. The elastic support portion 79c supports the date of the shorter month feeding pawl 79b movably toward the inside in the radial direction in the pawl groove 79 d.

The return spring coupling portion 80 is a member formed in a cylindrical shape, and is externally fitted and fixed to the cylindrical portion 77 at a position on the front surface side of the operating rod 71.

A return spring 82 (corresponding to an "urging member" in the claims) is connected to the return spring connecting portion 80. The return spring 82 is, for example, a balance spring formed along an archimedean curve centered on the second axis C2. The return spring 82 has an inner end fixed to the return spring coupling portion 80 and an outer end fixed to a fixing pin 84 provided upright from the main plate 5.

The return spring 82 biases the date indicator gear 78 of the date indicator feed claw wheel 76 in the CCW direction from a post-feed position (hereinafter, simply referred to as a "post-feed position") in which the date indicator feed claw 79b presses and rotates the tooth portion 22 of the date indicator 20 toward a pre-feed position.

The return spring 82 is fixed to the return spring coupling portion 80 and the fixing pin 84 in a state of biasing the date of the shorter month feed pawl wheel 76 in the CCW direction. By bringing the regulating pin portion 71a of the operating lever 71 into abutment with the CW-direction end portion of the groove portion 78a of the pawl gear 78, the rotation of the moonlet date feeding pawl wheel 76 in the CCW direction is regulated and held.

As shown in fig. 2 and 4, the day change intermediate wheel 85 is provided so as to be rotatable about the third axis C3 between the first axis C1 and the second axis C2 with respect to the action lever body 71. The date change intermediate wheel 85 is engaged with the date of the shorter month feeding pawl wheel 76 by the pawl gear 78.

In a first position where the operation lever 71 is inclined in the CW direction about the second axis C2, the date changing intermediate wheel 85 is separated from the date feeding claw wheel 47. Further, at a second position where the operation lever 71 is inclined in the CCW direction about the second axis C2, the date changing intermediate wheel 85 is engaged with the date feed claw wheel 47.

(action)

Next, the operation of the calendar mechanism 100 described above will be explained. The following description deals with the operation of the calendar mechanism 100 until the last day of a month passes and the first day of the next month passes.

Fig. 9 is a block diagram showing a power transmission path in the calendar mechanism. In fig. 9, the solid-line arrows indicate the power transmission direction.

Fig. 10 to 15 are plan views showing the time of 24 hours 00 minutes of the last day in the date feed of the shorter month, and they are arranged in time series in the order of fig. 10 to 15. Reference numerals for components of the calendar mechanism 100 in the following description are referred to in the drawings as appropriate.

First, the operation of the calendar mechanism 100 from the last day of a month to the first day of the next month will be described. Hereinafter, the operation of the calendar mechanism 100 when shifting from the last day of 4 months (4 months 30 days) as a shorter month to the first day of 5 months (5 months 1 days) as a longer month will be described as an example. In the following description, the operation of the calendar mechanism 100 on the last day of the shorter month corresponds to the operation of the calendar mechanism 100 on the last day of

months

4, 6, 9, and 11, excluding 2 months.

As shown in fig. 7, a date character 21 of "30" indicating 30 days is displayed in the day window 11 a. In addition, in the month window 11b, a month character 15a indicating "APR" of 4 months, which is a shorter month, is displayed. In addition, the distal end portion 75a of the shorter month determination lever 75 is arranged at a position corresponding to the concave portion 34b of the 4 th month which is a shorter month.

Power from a power source (not shown) such as a motor or a drum is transmitted to the day-changing wheel 43 of the main day-changing mechanism 40 via a gear train such as the hour wheel 16 or the intermediate wheel 17 (see fig. 9). Thereby, the day-change wheel 43 of the main day-change mechanism 40 rotates at a speed of one rotation per day in the CW direction about the first axis C1.

The operation cam 50 rotates in the CW direction together with the day-shift pulley 43 in a state where the regulating pin portion 51 abuts on the end of the groove portion 43 a. Thereby, the date feed pawl wheel 47 and the control cam 45 of the main day changing mechanism 40 rotate at a speed of one rotation per day in the CW direction around the first shaft C1 in synchronization with the day changing wheel 43 and the operating cam 50.

The second convex portion 53b of the operating cam lever 52 is in sliding contact with the operating cam surface 50a by the rotation of the operating cam 50.

At this time, the distal end portion 73a of the date feed judging lever 73 of the operation lever body 71 is in sliding contact with the region other than the date feed judging section 46 of the control cam 45. The actuating lever 71 is disposed at a first position inclined in the CW direction about the second axis C2. Further, the date change intermediate wheel 85 is separated from the date feed claw wheel 47.

Then, when the date feeding claw wheel 47, the control cam 45, the date changing wheel 43, and the operating cam 50 are further rotated in the CW direction with the passage of time, the distal end portion 73a of the date feeding determination lever 73 reaches the date feeding determination section 46 of the control cam 45.

Next, as shown in fig. 8, when the time period is 23 th 55 th, the distal end portion 73a of the date feeding determination lever 73 enters the date feeding determination portion 46 of the control cam 45 by the biasing force of the operating lever spring 72. The distal end portion 74a of the 30-day determination lever 74 enters the 30-day determination unit 29 and follows it. Further, the distal end portion 75a of the shorter month determination lever 75 enters the concave portion 34b of the month cam 33 to follow it. Thus, the operating lever 71 rotates in the CCW direction about the second axis C2, and moves from the first position inclined in the CW direction about the second axis C2 to the second position inclined in the CCW direction about the second axis C2. The date change intermediate wheel 85 moves in accordance with the rotation of the operation lever 71 and engages with the date feed pawl wheel 47.

Further, the second convex portion 53b of the operating cam lever 52 reaches the pressing surface 50b by the rotation of the operating cam 50.

Next, as shown in fig. 10, when the 24 th-00 th minute is reached, the second convex portion 53b of the operating cam lever 52 presses the pressing surface 50b of the operating cam 50 by the biasing force of the operating cam lever spring 54. Thereby, the date feed claw wheel 47, the control cam 45, and the operation cam 50 of the main day-changing mechanism 40 rotate at a higher speed in the CW direction than the day-changing wheel 43.

The date change intermediate wheel 85 is rotated at high speed in the CCW direction about the third axis C3 by power transmission from the date feed pawl wheel 47. Further, the claw gear 78 of the month date feeding claw wheel 76 meshing with the date change intermediate wheel 85 rotates at a high speed in the CW direction against the urging force of the return spring 82.

Next, as shown in fig. 11, the date feeding pawl 79b of the date feeding pawl wheel 76 rotates at high speed in the CW direction about the second shaft C2 and abuts against the tooth portion 22 of the date wheel 20. The date of the shorter month feeding pawl 79b of the date of the shorter month feeding pawl wheel 76 presses the tooth portion 22 of the date wheel 20. The date indicator 20 is disengaged from the date jumper 25 and rotated in the CW direction about the center axis O.

The 30-day determination unit 29 moves in the CW direction as the date wheel 20 rotates. At this time, the distal end portion 74a of the day 30 determination lever 74 entering the day 30 determination unit 29 moves along the day 30 determination unit 29 and tries to come out of the day 30 determination unit 29. The operating lever 71 rotates in the CW direction about the second axis C2.

Next, as shown in fig. 12, the date indicator 20 is engaged with the date jumper 25 again and rotated about the center axis O by 1 step in the CW direction. The date character 21 displayed in the date window 11a is switched from "30" to "31".

The distal end portion 74a of the 30-day determination lever 74 is released from the 30-day determination unit 29 while sliding in contact therewith. Thus, the operating lever 71 rotates in the CW direction about the second axis C2 from the second position inclined in the CCW direction about the second axis C2 to the first position inclined in the CW direction about the second axis C2. Thereby, the date change intermediate wheel 85 is separated from the date feed claw wheel 47. Further, the power transmission from the date feed claw wheel 47 via the date change intermediate wheel 85 of the shorter month date feed claw wheel 76 is released.

Here, the date of the shorter month feeding pawl wheel 76 is biased from the post-feeding position toward the pre-feeding position by the return spring 82. Therefore, when the power transmission from the date feeding claw wheel 47 is released, the date feeding claw wheel 76 rotates at a high speed in the CCW direction about the second axis by the urging force of the return spring 82. Thereby, the date of the shorter month feeding claw 79b is instantaneously returned from the post-feeding position to the pre-feeding position. The date of shorter month feeding pawl wheel 76 is elastically supported by the elastic support portion 79c so as to be movable radially inward. Therefore, the date indicator feeding claw 79b moves radially inward even if it comes into contact with the tooth portion 22 of the date wheel 20 when returning from the post-feeding position to the pre-feeding position. Thus, the date indicator 20 does not rotate in the CCW direction because the date feeding pawl 79b is prevented from engaging with the tooth portion 22.

Next, as shown in fig. 13, the date feed claw wheel 47, the control cam 45, and the operating cam 50 of the main day-changing mechanism 40 rotate at high speed in the CW direction about the first shaft C1. The claw portion 47c of the date feed claw wheel 47 abuts against the tooth portion 22 of the date wheel 20 to press it.

Next, as shown in fig. 14, the date indicator 20 is disengaged from the date jumper 25 and rotated in the CW direction about the center axis O. In addition, the month feed portion 26 pushes the tooth 28a of the month intermediate wheel 28 provided inside the date wheel 20 in accordance with the rotation of the date wheel 20. Thereby, the month intermediate wheel 28 rotates in the CW direction. The month wheel 30 meshing with the month intermediate wheel 28 is disengaged from the month jumper 35 and rotated in the CCW direction. Thereby, the month display plate 15 on which the month letters 15a are displayed is rotated in synchronization with the month wheel 30.

Next, as shown in fig. 15, the date indicator 20 is engaged with the date jumper 25 again and rotated about the center axis O by 1 step in the CW direction. Thereby, the date character 21 displayed in the date window 11a is switched from "31" to "1".

Further, the month wheel 30 is again engaged with the month jumper 35 and rotated 1 step in the CCW direction about the center axis O. The month display plate 15 on which the month letters 15a are displayed is rotated about the center axis O by 1 step in the CCW direction in synchronization with the month wheel 30. The month letters 15a displayed in the month window 11b are switched from "APR" indicating 4 months to "MAY" indicating 5 months.

With the above, the action of the calendar mechanism 100 when shifting from the last day of 4 months, which is a small month, to the first day of 5 months, which is a large month, is completed.

Fig. 16 is a plan view showing the time of 23 hours and 55 minutes of 30 days in the date advance of the grand month.

Fig. 17 is a plan view showing the time of 24 hours and 00 minutes of 30 days in date feeding of a large month, and is a diagram of a state in the middle of the date feeding.

Next, as an example, the operation of the calendar mechanism 100 when shifting from 30 days of 5 months, i.e., a large month, to the first day of 6 months, i.e., a small month (6 months, 1 days) after the passage of 31 days will be described. The same operation as that of the calendar mechanism 100 when shifting from the last day of month 4, which is a small month, to the first day of month 5, which is a large month, is described above, detailed description thereof is omitted.

As shown in fig. 16, a date character 21 of "30" indicating 30 days is displayed in the day window 11 a. In addition, in the month window 11b, a month character 15a indicating "MAY" of 5 months, which is a large month, is displayed.

Further, since the date indicator 20 displays the date 30, the distal end portion 74a of the date determination lever 74 is disposed at a position corresponding to the date determination unit 29 of the date indicator 20 for the date 30.

In addition, the distal end portion 75a of the shorter month determination lever 75 is arranged at a position corresponding to the convex portion 34a of 5 months, which is a longer month.

As time passes, the date feed claw wheel 47, the control cam 45, the day drive wheel 43, and the operation cam 50 rotate in the CW direction. The distal end portion 73a of the date feeding determination lever 73 reaches the date feeding determination portion 46 of the control cam 45.

Next, as shown in fig. 16, when the time period 23 of 30 days is reached at 55 minutes, the distal end portion 73a of the date feed determination lever 73 attempts to enter the date feed determination portion 46 of the control cam 45 by the urging force of the operating lever spring 72.

Here, the distal end portion 75a of the shorter determination lever 75 is arranged at a position corresponding to the convex portion 34 a. Therefore, the distal end portion 75a of the month determination lever 75 abuts on the convex portion 34a, and the rotation of the operation lever body 71 in the CCW direction (i.e., the movement from the first position to the second position) is restricted. The date change intermediate wheel 85 is held in a state separated from the date feed pawl wheel 47. Therefore, the power transmission from the date feeding claw wheel 47 is cut off, so that the date changing intermediate wheel 85 and the claw gear 78 of the shorter date feeding claw wheel 76 are held without rotation.

Next, when 24 hours 00 minutes of 30 days has elapsed, the second convex portion 53b of the operating cam lever 52 presses the pressing surface 50b of the operating cam 50 by the biasing force of the operating cam lever spring 54. Thereby, the date feed claw wheel 47, the control cam 45, and the operation cam 50 of the main day-changing mechanism 40 rotate at a higher speed in the CW direction than the day-changing wheel 43.

Next, as shown in fig. 17, the date feed claw wheel 47, the control cam 45, and the operating cam 50 of the main day-changing mechanism 40 rotate at high speed in the CW direction about the first shaft C1. The claw portion 47c of the date feed claw wheel 47 abuts against the tooth portion 22 of the date wheel 20 to press it. The date indicator 20 is disengaged from the date jumper 25 and rotated in the CW direction about the center axis O. At this time, the distal end portion 73a of the date feeding determination lever 73 is in sliding contact with the area of the control cam 45 other than the date feeding determination unit 46.

Next, as shown in fig. 18, the date indicator 20 is engaged with the date jumper 25 again and rotated about the center axis O by 1 step in the CW direction. The date character 21 displayed in the date window 11a is switched from "30" to "31".

The same operation is performed when switching from 5 months 31 days, which is the last day of a long month, to 6 months 1 days, which is the first day of a short month. That is, when 24 hours 00 minutes of 31 days of 5 months is reached, the second convex portion 53b of the operating cam lever 52 presses the pressing surface 50b of the operating cam 50 by the biasing force of the operating cam lever spring 54. The date feed pawl wheel 47, the control cam 45, and the operating cam 50 of the main day changing mechanism 40 rotate at high speed in the CW direction about the first shaft C1. The claw portion 47c of the date feed claw wheel 47 abuts against the tooth portion 22 of the date wheel 20 to press it. Thereby, the date indicator 20 is disengaged from the date jumper 25 and rotated in the CW direction about the center axis O.

In addition, the month feed portion 26 pushes the tooth 28a of the month intermediate wheel 28 provided inside the date wheel 20 in accordance with the rotation of the date wheel 20. Thereby, the month intermediate wheel 28 rotates in the CW direction. The month wheel 30 meshing with the month intermediate wheel 28 is disengaged from the month jumper 35 and rotated in the CCW direction. Thereby, the month display plate 15 on which the month letters 15a are displayed is rotated in the CCW direction in synchronization with the month wheel 30

Next, the date indicator 20 is engaged with the date jumper 25 again and rotated about the center axis O in the CW direction by 1 step. Thereby, the date character 21 displayed in the date window 11a is switched from "31" to "1".

Further, the month wheel 30 is again engaged with the month jumper 35 and rotated 1 step in the CCW direction about the center axis O. Thereby, the month characters 15a displayed in the month window 11b are switched from "MAY" indicating 5 months to "JUN" indicating 6 months.

As described above, the operation of the calendar mechanism 100 when shifting from 30 days of 5 months, which is a long month, to 31 days, which is the last day, to 1 day of 6 months, which is the first day of the long month, is completed.

According to the present embodiment, since the calendar mechanism 100 can be operated by the operating lever 71, the number of parts can be reduced and the structure can be simplified as compared with the conventional technique including 4 levers.

Further, since the 30-day determination lever 74 and the shorter-month determination lever 75 are provided on the operation lever body 71, the 30-day determination lever 74 and the shorter-month determination lever 75 can be arranged at predetermined positions only by fitting the operation lever body 71. That is, since it is not necessary to separately align the 30-day determination lever 74 and the moonlet determination lever 75, the manufacturing can be easily performed.

Further, by causing the 30-day determination lever 74 to follow the 30-day determination unit 29 and causing the shorter-month determination lever 75 to follow the concave portion 34b of the month cam 33, the operation lever 71 is rotated from the first position toward the second position, and when the operation lever 71 is at the second position, the date change intermediate wheel 85 is engaged with the date feed claw wheel 47, so that the power of the date feed claw wheel 47 can be transmitted to the shorter-month date feed claw wheel 76 via the date change intermediate wheel 85. Therefore, the date wheel 20 can be rotated by the date feeding claw wheel 47 and the date feeding claw wheel 76 on the last day of the shorter month to feed the date correctly.

Further, since the operation lever 71 includes the date feed determination lever 73 which is in sliding contact with the outer peripheral surface of the control cam 45, the 30-day determination lever 74 can follow the 30-day determination unit 29 without contacting the date wheel 20. This can suppress the occurrence of a load on the date indicator 20 from the operating lever 71, and therefore, the date indicator 20 can be prevented from being displaced, and the date can be displayed at a predetermined position.

Further, since the month day changing mechanism 70 includes the return spring 82 for biasing the date indicator wheel 76 from the post-feed position to the pre-feed position, the date indicator wheel 76 can return to the pre-feed position after rotating the date indicator wheel 20 in the month. Therefore, the date can be correctly fed even in the next month.

Further, since the date indicator wheel has the elastic support portion 79c that elastically supports the date indicator feed claw 79b to be movable toward the inside in the radial direction of the date indicator feed claw wheel 76, the date indicator wheel 20 can be prevented from rotating when the date indicator feed claw 79b is returned from the post-feed position toward the pre-feed position. Therefore, the date wheel can be rotated by the date feeding claw wheel 47 and the date feeding claw wheel 76 on the last day of the shorter month, and the date can be fed correctly.

Further, since the calendar mechanism 100 is simple in structure and can be easily manufactured, the movement 10 and the timepiece 1 can be realized at low cost with excellent reliability.

(modification of embodiment)

Fig. 19 is a plan view of a movement provided with a calendar mechanism according to a modification, and fig. 20 is a cross-sectional view taken along line C-C of fig. 19.

Next, a modified example of the embodiment will be described.

The calendar mechanism 100 of the above embodiment includes: a control cam 45 rotatably stacked on the day-change wheel 43; and a date feeding determination lever 73 that is in sliding contact with the control cam 45 (refer to fig. 2 and 4).

In contrast, as shown in fig. 19 and 20, the calendar mechanism 100 according to the modification of the embodiment is different from the embodiment in that it does not include a control cam and a date feed determination lever. Hereinafter, the same components as those of the above-described embodiment will not be described in detail.

(Main day-changing mechanism)

As shown in fig. 19 and 20, the main day change mechanism 40 includes a day change pin 41, a day change wheel 43, an operation cam 50, an operation cam lever 52, and a date feed claw wheel 47.

The solar control pin 41 is formed in a tubular shape, and is loosely inserted into the shaft member 6 so as to be rotatable about the first shaft C1. A support plate portion 41a is provided at an axially intermediate portion of the day-changing pin 41. The support plate portion 41a is disposed on the back side of the movement 10 with respect to the day-change wheel 43. The support plate portion 41a is formed in a circular shape when viewed in the axial direction, and has a diameter smaller than the sun gear 43.

The date feed claw wheel 47 is fitted and fixed to the back side end of the date changing pin 41. The date feed pawl gear 47a of the date feed pawl wheel 47 is disposed in a state of abutting on the support plate portion 41 a.

The month changing mechanism 70 includes an operation lever 71.

The operation lever 71 includes a restriction pin portion 71a, a 30-day determination lever 74, and a shorter-month determination lever 75. The 30-day determination lever 74 and the shorter-month determination lever 75 are formed integrally.

The distal end portion 74a of the 30-day determination lever 74 is formed so as to be curved toward the inner peripheral surface 20a of the date wheel 20. The distal end portion 74a of the 30-day determination lever 74 is brought into contact with the inner peripheral surface 20a of the date wheel 20 by the urging force of the operating lever spring 72.

When switching is performed on 30 days, which is the last day of a shorter month, the distal end portion 74a of the 30-day determination lever 74 enters the 30-day determination unit 29 and is in sliding contact therewith, thereby being able to follow the 30-day determination unit 29.

The shorter date feeding claw 79b is formed longer in the radial direction. The shorter date feeding pawl 79b projects radially outward from the pawl gear 78 and faces approximately in the 9 o' clock direction.

When the distal end portion 74a of the day 30 determination lever 74 is in sliding contact with the inner peripheral surface 20a of the date indicator 20 in the region other than the day 30 determination unit 29, the operation lever body 71 is disposed at the first position inclined in the CW direction about the second axis C2. When the distal end portion 74a of the day 30 determination lever 74 enters the day 30 determination unit 29 of the date indicator 20 and comes into sliding contact therewith, the operation lever body 71 is disposed at a second position inclined in the CCW direction from the first position about the second axis C2.

(action)

Next, an operation of the calendar mechanism 100 according to the modification of the above embodiment will be described. The following description deals with the operation of the calendar mechanism 100 until the last day of a month passes and the first day of the next month passes.

Fig. 23 to 27 are plan views showing the time of 24 hours 00 minutes of the last day in the date feed of the shorter month, and they are arranged in time series in the order of fig. 23 to 27.

First, the operation of the calendar mechanism 100 from the last day of a month to the first day of the next month will be described. Hereinafter, the operation of the calendar mechanism 100 when shifting from the last day of 4 months (4 months 30 days) as a shorter month to the first day of 5 months (5 months 1 days) as a longer month will be described as an example.

As shown in fig. 19, a date character 21 of "29" indicating 29 days is exposed and displayed on the day window 11 a. In the moon window 11b, a month character 15a indicating "APR" of 4 months, which is a small month, is exposed and displayed.

The distal end portion 75a of the shorter month determination lever 75 is disposed at a position corresponding to the concave portion 34b of the shorter month.

The date feed claw wheel 47 and the operating cam 50 of the main day changing mechanism 40 rotate at a higher speed in the CW direction than the day changing wheel 43 before the last day of the month's date feed, that is, before the day 29 is about to be 24 hours 00 minutes. The claw portion 47c of the date feed claw wheel 47 abuts against the tooth portion 22 of the date wheel 20 to press it.

Next, as shown in fig. 21, at the time 00 hour and 00 hour of 30 days, which is the last day in the date advance of the shorter month, the date wheel 20 is rotated by 1 step, and the date character 21 exposed from the date window 11a is switched from "29" to "30".

Next, the distal end portion 74a of the day 30 determination lever 74 reaches the day 30 determination unit 29 of the date indicator 20, and enters the day 30 determination unit 29 of the date indicator 20 by the urging force of the operating lever spring 72. Further, the distal end portion 75a of the shorter month determination lever 75 enters the concave portion 34b of the month cam 33 to follow it. Thus, the operating lever 71 rotates in the CCW direction about the second axis C2, and moves from the first position inclined in the CW direction about the second axis C2 to the second position inclined in the CCW direction about the second axis C2 from the first position. The date change intermediate wheel 85 moves in accordance with the rotation of the operation lever 71 and engages with the date feed pawl wheel 47.

The regulating pin portion 51 of the operating cam 50 moves in the groove portion 43a due to the high-speed movement of the date feeding pawl wheel 47 and the operating cam 50, and then abuts against the CCW direction end portion of the groove portion 43a of the date changing wheel 43 rotating at a constant speed after a predetermined time (about 5 hours and 55 minutes in the present embodiment). Therefore, the operation cam 50 and the date feed claw wheel 47 stop when not rotated for 5 hours 55 of 30 days.

Next, as shown in fig. 22, when the time 55 is 5 hours of 30 days, for example, the restricting pin portion 51 of the operating cam 50 abuts on the CCW direction end portion of the groove portion 43a of the day-change wheel 43. Thereby, the power of the day-change wheel 43 rotating in the CW direction at a constant speed is transmitted to the operation cam 50 and the date feed claw wheel 47 via the regulating pin portion 51. The operating cam 50 and the date feed pawl wheel 47 rotate in synchronization with the day change wheel 43. The date change intermediate wheel 85 engaged with the date feed claw wheel 47 is rotated at a predetermined speed in the CCW direction about the third axis C3 by power transmission from the date feed claw wheel 47.

As shown in fig. 23, as time passes, the pawl gear 78 of the month date feeding pawl wheel 76 that meshes with the date change intermediate wheel 85 rotates at a predetermined speed in the CW direction against the urging force of the return spring 82.

Next, as shown in fig. 24, when 24 hours 00 of 30 days is reached, the date and month feeding claw 79b of the date and month feeding claw wheel 76 abuts on the tooth portion 22 of the date wheel 20. The date of the month feeding claw 79b of the date of the month feeding claw wheel 76 presses the tooth portion 22 of the date wheel 20.

Next, as shown in fig. 25, the date indicator 20 is disengaged from the date jumper 25 and rotated in the CW direction about the center axis O. The 30-day determination unit 29 moves in the CW direction as the date wheel 20 rotates. At this time, the distal end portion 74a of the day-30 determination lever 74 entering the day-30 determination unit 29 attempts to come out of the day-30 determination unit 29. The operating lever 71 rotates in the CW direction about the second axis C2.

Next, as shown in fig. 26, the date indicator 20 is engaged with the date jumper 25 again and rotated about the center axis O by 1 step in the CW direction. The date character 21 displayed in the date window 11a is switched from "30" to "31".

The operating lever 71 rotates in the CW direction about the second axis C2 from the second position inclined in the CCW direction about the second axis C2 to the first position inclined in the CW direction about the second axis C2. Thereby, the date change intermediate wheel 85 is separated from the date feed claw wheel 47.

Further, the power transmission from the date feed claw wheel 47 via the date change intermediate wheel 85 of the shorter month date feed claw wheel 76 is released. The date before month feed pawl wheel 76 rotates at a high speed in the CCW direction about the second axis by the biasing force of the return spring 82, and is instantaneously returned from the position after the feed to the position before the feed.

The second convex portion 53b of the operating cam lever 52 reaches the pressing surface 50b and presses the same by the rotation of the operating cam 50. Thereby, the date feed claw wheel 47 and the operating cam 50 of the main day changing mechanism 40 rotate at a higher speed in the CW direction than the day changing wheel 43. The date of the shorter month feeding pawl 79b of the date of the shorter month feeding pawl wheel 76 presses the tooth portion 22 of the date wheel 20. The date indicator 20 is disengaged from the date jumper 25 and rotated in the CW direction about the center axis O.

Then, as shown in fig. 27, the date indicator 20 is engaged with the date jumper 25 again and rotated about the center axis O by 1 step in the CW direction. The date character 21 displayed in the date window 11a is switched from "31" to "1".

In addition, the month feed portion 26 pushes the tooth 28a of the month intermediate wheel 28 provided inside the date wheel 20 in accordance with the rotation of the date wheel 20. Thus, the month characters 15a displayed in the month window 11b are switched from "APR" indicating 4 months to "MAY" indicating 5 months.

Fig. 28 is an explanatory diagram of date feeding for the month of dawn.

Next, as an example, the operation of the calendar mechanism 100 when shifting from 30 days of 5 months, which is a long month, to 31 days, which is the last day, to 1 day of 6 months, which is the first day of the long month, will be described. Further, the same operation as the date feeding operation of the calendar mechanism 100 according to the embodiment described above or the date feeding operation of the month in the calendar mechanism 100 according to the modified example of the embodiment described above is not described in detail.

As shown in fig. 28, the distal end portion 75a of the shorter month determination lever 75 is disposed at a position corresponding to the convex portion 34a of the longer month (5 months in fig. 28). The distal end portion 75a of the crescent determination lever 75 abuts on the projection 34a, and the rotation of the operation lever 71 in the CCW direction (i.e., the movement from the first position to the second position) is restricted. The date change intermediate wheel 85 is held in a state separated from the date feed pawl wheel 47. Therefore, the power transmission from the date feeding claw wheel 47 is cut off, so that the date changing intermediate wheel 85 and the claw gear 78 of the shorter date feeding claw wheel 76 are held without rotation.

Next, at a predetermined time (for example, 24 hours 00 minutes) of 30 days, the second convex portion 53b of the operating cam lever 52 presses the pressing surface 50b of the operating cam 50 by the biasing force of the operating cam lever spring 54. Thereby, the date feed claw wheel 47 and the operating cam 50 of the main day changing mechanism 40 rotate at a higher speed in the CW direction than the day changing wheel 43. Thereby, the date indicator 20 rotates about the center axis O in the CW direction by 1 step, and the date character 21 displayed in the date window 11a is switched from "30" to "31".

The same operation is performed when switching from 5 months 31 days, which is the last day of a long month, to 6 months 1 days, which is the first day of a short month. That is, when 24 hours 00 minutes of 31 days of 5 months is reached, the second convex portion 53b of the operating cam lever 52 presses the pressing surface 50b of the operating cam 50 by the biasing force of the operating cam lever spring 54. Thereby, the date indicator 20 rotates about the center axis O in the CW direction by 1 step, and the date character 21 displayed in the date window 11a is switched from "31" to "1".

In addition, the month feed portion 26 pushes the tooth 28a of the month intermediate wheel 28 provided inside the date wheel 20 in accordance with the rotation of the date wheel 20. Thereby, the month characters 15a displayed in the month window 11b are switched from "MAY" indicating 5 months to "JUN" indicating 6 months.

According to the modified example of the embodiment, the same effects as those of the foregoing embodiment can be obtained. Further, since the control cam is not required, the calendar mechanism 100 can be further miniaturized and thinned.

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

The control cam 45 of the embodiment is formed as: the side surface 46a of the date feeding determination unit 46 in the CW direction is along the radial direction (see fig. 5).

On the other hand, as in the control cam 45 shown in fig. 29, the opening of the date feeding determination section 46 may be enlarged by inclining the side surface 46a of the date feeding determination section 46 in the CW direction from the radially inner side toward the radially outer side in the CW direction.

With this configuration, the distal end portion 73a of the date feeding determination lever 73 enters the date feeding determination unit 46 at a speed lower than that in the embodiment while sliding on the inclined side surface 46 a. At this time, the operation lever 71 rotates from the first position to the second position at a speed lower than that of the embodiment, and therefore, the date feeding pawl wheel 47 and the date change intermediate wheel 85 mesh at a speed lower than that of the embodiment. This can suppress wear of the teeth of the date feed pawl wheel 47 and the date change intermediate wheel 85, and thus can realize the calendar mechanism 100 having excellent durability.

Fig. 30 is an external view of a timepiece according to another embodiment, and fig. 31 is a sectional view of a movement of the timepiece according to the other embodiment shown in fig. 30.

In the embodiment, the month display plate 15 is disposed on the front surface side of the movement 10 with respect to the dial 11, and the month characters 15a of the month display plate 15 are exposed from the month window 11b, thereby displaying the month (see fig. 1 and 3).

On the other hand, as shown in fig. 30 and 31, the month hand 18 may be disposed on the back side of the movement 10 with respect to the dial 11, and the letters 1 to 12 displayed on the dial 11 may be indicated by the month hand 18 to display the month.

In the embodiment, a balance spring is used as the return spring 82, but the present invention is not limited to the balance spring. Therefore, for example, a coil spring may be used as the return spring, and a plate spring may be used as the return spring.

In addition, the components in the above embodiments may be replaced with known components as appropriate without departing from the scope of the present invention.

Claims

1. A calendar mechanism, characterized in that,

the calendar mechanism includes:

a month wheel, which rotates one turn a year;

a date wheel that rotates one month and has a 30-day determination section at a predetermined position in the circumferential direction;

a main day-changing mechanism that rotates the date wheel one day; and

a month day changing mechanism for rotating the date indicator on the last day of a month having a month day of 30 days or less,

the month wheel has a month cam formed with a small month determination part corresponding to the small month on an outer circumferential surface,

the main date changing mechanism comprises:

an operation cam that rotates once a day and is stacked on a day change wheel that rotates once a day at a constant speed; and

a date feed claw wheel which rotates in synchronization with the operation cam to rotate the date wheel,

the moonlet date changing mechanism includes:

a movement lever body which rotates around a predetermined axis and is provided with a 30-day determination lever capable of following the 30-day determination unit and a shorter month determination lever capable of following the shorter month determination unit;

a moonlet date feeding claw wheel that rotates the date wheel on the last day of the moonlet; and

a date change intermediate wheel provided so as to be rotatable with respect to the action lever body in a state of being engaged with the shorter date feed pawl wheel,

the operating lever body is rotated from a first position to a second position by causing the 30-day determination lever to follow the 30-day determination unit and causing the shorter-month determination lever to follow the shorter-month determination unit,

the date change intermediate wheel is separated from the date feed claw wheel when the action lever body is at the first position, and is meshed with the date feed claw wheel when the action lever body is at the second position.

2. A calendar mechanism according to claim 1,

the main date change mechanism is provided with a control cam which rotates synchronously with the operating cam and is provided with a date feeding determination part on the outer peripheral surface,

the operation lever body has a date feed determination lever that is in sliding contact with an outer peripheral surface of the control cam, and the 30-day determination lever follows the 30-day determination section and the shorter month determination lever follows the shorter month determination section when the date feed determination lever is in sliding contact with the date feed determination section.

3. A calendar mechanism according to claim 1 or 2,

the date indicator includes a date indicator lever, a date indicator.

4. A calendar mechanism according to claim 3,

the date of the moonlet feed claw wheel is provided with a date of the moonlet feed claw which presses a tooth part of the date wheel to rotate the date wheel,

the date of the moonlet feed pawl wheel has an elastic support portion that elastically supports the date of the moonlet feed pawl such that: the date of moonlight feed claw is movable toward a radial inside of the date of moonlight feed claw wheel when moving from the post-feed position toward the pre-feed position and abutting against the tooth portion.

5. A machine core is characterized in that a machine core is provided,

the movement is provided with the calendar mechanism of claim 4.

6. A timepiece, characterized in that it comprises, in a case,

the timepiece is provided with the movement of claim 5.