CH712123B1 - Calendar mechanism, movement and timepiece. - Google Patents

Abstract

The present invention relates to a calendar mechanism, a movement, and a timepiece which are simple in structure and can be easily produced. A date indicator (20) having a thirtieth calendar determining part, a month indicator (30) rotating by year, a date indicator main control mechanism (40), and a date control mechanism. short month date indicator (70) rotating the date indicator (20) at the end of a short month are provided. The month indicator (30) has a month cam (33) having on its outer peripheral surface notches (34b) corresponding to short months; the date indicator main control mechanism (40) has a date indicator drive wheel (43), and a day advancing ratchet (47); the short month date indicator control mechanism (70) includes an operating lever (71), a short month day advancement ratchet (76), and an intermediate date wheel (85); the operating lever (71) rotates from a first position to a second position when the thirtieth date determining lever (74) follows the thirtieth date determining part (29), and the month determining lever (75 ) follows the notch (34b); the intermediate date wheel (85) is spaced from the day advancement ratchet (47) when the operating lever (71) is in the first position, and meshes with the day advancement ratchet (47) when the operating lever (71) is in the second position.

Description

BACKGROUND OF THE INVENTION

1. Field of the invention

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

2. Description of the prior art

With regard to timepieces comprising a calendar capable of displaying a date, calendar mechanisms are known in which the correction of the date is reduced to a minimum by making a date change from two days to the end of a short month having 30 days or less (see, for example, Japanese Patent No. 5105467).

This patent document discloses a calendar mechanism equipped with a date disc (date indicator) equipped with a first row of internal teeth and a second row of internal teeth, a date change gear having a finger drive which controls, via the teeth of the first row of internal teeth, the date display, a corrector gear co-operating with the second row of internal teeth to advance the date disc one more step at the end a short month, and a month-changing cog driving a star-shaped month wheel at the end of each month. As lever-type elements, there is a lever controlled by a tenon of the date disc, a first pivot lever to operate the date change gear and month change gear, a second swivel lever to operate operate the corrector gear, and a lever cooperating with the star-shaped month wheel to control the rotation of the second pivoting lever.

In the technique of the prior art, however, the number of lever-type elements is very large and involves a complicated structure, so that rather high costs can be feared. Further, to operate the levers in a coordinated manner at predetermined times, it is necessary to mount each lever in a state in which it is set in a predetermined position, so that there is also a fear that the manufacturing process will become quite complicated.

Summary of the invention

The present invention has been conceived in view of the above problems. An object of the present invention to provide a calendar mechanism, a movement, and a timepiece which are of simple structure and which can be produced easily.

To achieve this above objective, there is provided, in accordance with the present invention, a calendar mechanism comprising: an indicator of the months rotating per year; a date indicator rotating per month and having a thirtieth date determining part defined in a predetermined position at its periphery; a date indicator main control mechanism rotating per day and rotating the date indicator; and a short month indicator control mechanism rotating the date indicator at the end of a short month having 30 days or less, wherein: the month indicator comprises a month cam having, on its outer peripheral surface, short month determination parts corresponding to short months; the date indicator main control mechanism is equipped with a date indicator drive wheel, and has an actuating cam, superimposed on said date indicator drive wheel, and arranged movably in rotation relative thereto at a predetermined angle, and which is configured to perform one rotation per day at constant speed about a first axis, and a day advancement ratchet rotating in synchronization with the actuating cam and rotating the date indicator; the short month indicator control mechanism is provided with a thirtieth date determining lever capable of following the thirtieth date determining part, and a short month determining lever capable of following the short month determining parts , and comprises an actuating lever element rotating about a second predetermined axis, a short month day advancement ratchet rotating the date indicator at the end of a short month, and a wheel of intermediate date mounted on the actuating lever and movable in rotation with respect to the latter about a third axis when it meshes with the short month day advancement ratchet; operating lever moves from a first position to a second position when the thirtieth day determining lever follows the thirtieth date determining part, and the short month determining lever follows the short month determining part; and the intermediate date wheel is spaced from the day advancement ratchet when the actuation lever is in the first position, and in engagement with the day advancement ratchet when the actuation lever is in the second position .

[0007] According to the present invention, it is possible to actuate the calendar mechanism by means of the single actuating lever, so that, compared to the technique of the prior art, where four levers are required, it It is possible to reduce the number of components and simplify the structure.

[0008] In addition, the actuating lever is provided with the thirtieth date determining lever and the short month determining lever, so that, only by mounting the actuating lever, the thirtieth date determining lever and the short month determining lever are arranged in predetermined positions. In other words, there is no need to perform individual alignment on the thirtieth date setting lever and the short month setting lever, so that the production of the mechanism is facilitated.

[0009] Further, the actuating lever rotates from the first position to the second position when the thirtieth date determining lever 30 follows the thirtieth date determining portion and when the short month determining lever follows the portion of short month determination, and the intermediate date wheel engages the day advancing ratchet when in the second position, so that it is possible to transmit the energy of the advancing ratchet from day to month day advancement ratchet via intermediate date wheel. So, at the end of a short month, the date indicator is rotated by the day advancing ratchet and the month short month day advancing ratchet, making it possible to accurately perform the advancement of days.

The main date indicator control mechanism is equipped with a control cam rotating in synchronization with the actuating cam and having a day advancement determining part at its outer peripheral surface; and the operating lever has a day advancement determining lever in sliding contact with the outer peripheral surface of the control cam, and when the day advancement determining lever is in sliding contact with the determining portion advancing day, the thirtieth date determining lever follows the thirtieth date determining part, and the short month determining lever follows the short month determining part.

According to the present invention, the actuating lever is arranged so that the day advancement determining lever comes into sliding contact with the outer peripheral surface of the control cam, so that it is It is possible that the thirtieth date determining lever can follow the thirtieth date determining part without bringing it into contact with the date indicator. Therefore, it is possible to suppress the generation of a load of the operating lever to the date indicator, so that it is possible to prevent a deviation of the date indicator, making possible the display of the date in a predetermined position.

[0012] In addition, the short month calendar indicator control mechanism is equipped with a compression means for applying a restoring force to the short month day advancement ratchet aimed at bringing it from a position preceding the date change, that is to say before rotating the date indicator, to a position following the date change, this is after having rotated the date indicator.

According to the present invention, the short month day advancement ratchet can be returned to the position corresponding to that preceding the date change after having driven the date indicator in rotation during a short month. Thus it is possible to perform date changes with precision also for the following short month.

In addition, the short month day advancement ratchet is equipped with a short month day advancement finger pressing against a tooth of the date indicator to rotate the date indicator; and a resilient holder resiliently supporting the short month day advancing finger is arranged such that it can be moved radially inwardly of the short month day advancing ratchet when the short month day advancement finger moves from the position following the date change to the position prior to a date change to contact the tooth.

According to the present invention, there is provided an elastic support resiliently supporting the short month day advancement finger movable inwardly in the radial direction of the short month day advancement ratchet, so that 'it is possible to reliably prevent reverse rotation of the date indicator when the short month day advancement finger is restored from its position corresponding to that following the change of date to the position prior to the change of dated. So, it is possible to rotate the date indicator by the day advancement ratchet and the short month day advancement ratchet at the end of a short month, so that the day change can be carried out with precision.

In addition, the present invention also relates to a movement equipped with a calendar mechanism such as that described above.

In addition, the present invention also relates to a timepiece equipped with a movement such as that described above.

According to the present invention, therefore provides a calendar mechanism of simple structure and easy to manufacture, so that one can obtain a movement and a timepiece of better reliability and whose manufacturing costs are low.

According to the present invention, it is possible to operate the calendar mechanism via the single actuating lever, so that, compared to the technique of the prior art where four levers are provided for this Indeed, it is possible to reduce the number of components and obtain a simpler structure.

In addition, the actuating lever is provided with the thirtieth date determining lever and the short month determining lever, so that, only by mounting the actuating lever, the thirtieth date determining lever and the short month determination lever are arranged in predetermined positions. In other words, there is no need to perform individual positioning for the thirtieth calendar determining lever and the short month determining lever, so that production is facilitated.

Further, the actuating lever is rotated from the first position to the second position when the thirtieth date determining lever follows the thirtieth date determining part, the short month determining lever follows the short month determining part, and that the intermediate date wheel engages with the day advancement ratchet when it is in the second position, so that it is possible to transmit the power of the ratchet to day advancement to the short month day advancement ratchet via the intermediate date wheel. Therefore, at the end of a short month, the date indicator is rotated by the day advancement ratchet and the short month day advancement ratchet, which makes it possible to perform a date change. precisely.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is an external view of a timepiece according to a first preferred embodiment. Figure 2 is a plan view of a movement equipped with a calendar mechanism. Figure 3 is a sectional view taken along line AA of Figure 2. Figure 4 is a sectional view taken along line BB of Figure 2. Figure 5 is an enlarged plan view of Figure 2. 'a main date indicator control mechanism. FIG. 6 is an enlarged plan view of a lever for determining the thirtieth date and of a short month day advancement ratchet. Fig. 7 is a plan view showing the state at around 11.50pm on the last day for the day change in a short month. Fig. 8 is a plan view illustrating the state at about 23 hours 55 minutes on the last day for the day change in a short month. Fig. 9 is a diagram illustrating a power transmission path in a calendar mechanism. Fig. 10 is a plan view showing the state around 24 hours on the last day for the day change in a short month, with a first date change starting. Fig. 11 is a plan view showing the state at around 24 hours on the last day for the day change in a short month, with the first date change half completed. Fig. 12 is a plan view showing the state around 24 hours on the last day for day advancement in a short month, with the first date change made. Fig. 13 is a plan view showing the state around 24 hours on the last day for day advancement in a short month, with a second date change starting. Fig. 14 is a plan view showing the state at around 24 hours on the last day for day advancement in a short month, with the second date change halfway made. Fig. 15 is a plan view showing the state at around 24 hours on the last day for day advancement in a short month, with the second date change made. Fig. 16 is a plan view illustrating the state at around 23 hours 50 minutes on the thirtieth date for the date change during a long month. Fig. 17 is a plan view illustrating the state at around 24 o'clock on the thirtieth date for the date change during a long month, with the second date change halfway made. FIG. 18 is a plan view illustrating the state at around 24 o'clock during the thirtieth date for the date change during a long month, with the second date change performed. Fig. 19 is a plan view of a movement equipped with a calendar mechanism according to a modified embodiment. Fig. 20 is a sectional view taken along line CC of Fig. 19. Fig. 21 is a plan view showing the state around midnight on the last day for day advancement in a short month. . Fig. 22 is a plan view showing the state at about 5 hours 55 minutes on the last day for the advancement of one day in a short month. Fig. 23 is a plan view illustrating the state around 24 hours on the last day for advancing by one day in a short month, immediately before a first date change. Fig. 24 is a plan view showing the state around 24 hours on the last day for advancing one day in a short month, with a first date change starting. Fig. 25 is a plan view showing the state at around 24 hours on the last day for advancing by one day in a short month, with the first date change halfway made. Fig. 26 is a plan view showing the state at around 24 hours on the last day for advancing one day in a short month, with a second date change starting. Fig. 27 is a plan view showing the state around 24 hours on the last day for advancing one day in a short month, with the first date change made. FIG. 28 is an explanatory view illustrating the change in date of a month long. Fig. 29 is an explanatory view illustrating a control cam according to another embodiment. FIG. 30 is an external view of a timepiece according to another embodiment. Figure 31 is a sectional view of a movement of the timepiece according to the other embodiment shown in Figure 30.

DESCRIPTION OF EMBODIMENTS

In what follows, a preferred embodiment of the present invention will be described with reference to the drawings.

In the following, we will describe a mechanical wristwatch (which corresponds to the "timepiece" of the claims; hereinafter reference will simply be made to the "timepiece"), and then a Calendar mechanism according to the embodiment will be described in detail.

(Timepiece)

[0025] The mechanical body including the driving part of a timepiece is generally referred to as the "movement." Which is obtained as a complete product by fitting a dial and hands to this movement and putting the together in a timepiece case constitutes the “whole” of the timepiece. Among the two faces of a plate constituting the base plate of the timepiece, the face where the crystal of the timepiece case is located, that is to say, the side where the dial is located is commonly referred to as the “back side” of the movement; the face where the back of the timepiece case is located, that is to say, the face opposite the dial, is commonly referred to as the “front side” of the movement.

Figure 1 is an external view of a timepiece 1 according to the preferred embodiment. In the following description, the clockwise direction in the plan view of subsequent Figure 1 will be referred to as the CW direction ("clockwise), and the counterclockwise direction. a watch as being the CCW direction ("counterclockwise").

As shown in Figure 1, the assembly of the timepiece 1 of this embodiment contains, in a timepiece housing 3 consisting of a bottom (not shown) and a crystal 2, a movement 10, a dial 11 having a scale or the like indicating time information, and indicator hands including an hour hand 12 indicating the time, a minute hand 13 indicating the minutes, and a seconds hand 14 indicating the seconds. In the dial 11 are arranged a date window 11a exposing a number indicating the date, that is to say the day of the month, and a month window 11b exposing letters indicating the month. Due to this construction, the timepiece 1 can display the time, day of the month, and month.

Figure 2 is a plan view of the movement equipped with a calendar mechanism, and Figure 3 is a sectional view taken along the line A-A of Figure 2.

As shown in Figures 2 and 3, the movement 10 has a plate 5 constituting the base plate of the movement 10. As shown in Figure 3, on the front face of the plate 5, are arranged at least one mechanism exhaust / regulator (not shown) including a spiral balance, an escape mobile, an anchor, etc., and front gear including a second mobile (wheel & pinion) 8, a third mobile (wheel & pinion), a mobile center (wheel & pinion) 9, a movement barrel, etc. The seconds hand 14 is mounted at one end of the rear side of the second mobile 8, which rotates in 60 seconds in the CW direction around an axis of center O. The minute hand 13 is mounted at one end on the rear side of the center mobile 9, which rotates in 60 minutes in the CW direction around the axis of center O.

(Calendar mechanism)

As shown in Figures 2 and 3, a calendar mechanism 100 is equipped with an hours wheel 16, a date indicator 20, a month indicator 30, a main date indicator control mechanism 40 , and a short month calendar indicator control mechanism 70. In the following, the calendar mechanism 100 will be described in detail with reference to the drawings.

In the following description, we will refer to the months having 30 days or less (February, April, June, September and November) as being the short months, and the months having 31 days (January, March, May, July , August, October and December) as the long months.

The front end of the hour wheel 16 is formed as an hour toothed wheel 16a. The hour wheel 16 is engaged, that is to say meshes with a movement barrel (not shown) serving as a source of energy via the hour toothed wheel 16a and the cog. The hour wheel 16 is rotated by the energy transmitted from the barrel of the movement. The hour hand 12 is mounted at the rear end of the hour wheel 16, and rotates in 12 hours in the CW direction around the center axis O. The hour wheel 16 has an intermediate wheel. hours 16b at the rear of the hours gear 16a. The rotation of the hour wheel 16 is transmitted to a main date indicator control mechanism 40 as described below via the cog consisting, for example, of the intermediate hour wheel 16 bet an intermediate wheel 17.

The date indicator 20 is a ring-shaped element mounted movably in rotation on the plate 5. As shown in Figure 2, the inscriptions of days 21 representing the date from the first to the thirty-first day of the month are displayed successively on the surface of the date indicator 20 all along its periphery. Examples relating to the method of displaying Day 21 entries include printing, marking, and sealing, without this listing being restrictive. The date indicator 20 rotates in the CW direction. The entries for 21 days are displayed successively in accordance with the rotational direction of the date indicator 20.

An internal peripheral surface 20a of the date indicator 20 is formed over two stages. On the front side of the movement 10, on the inner peripheral surface 20a of the date indicator 20, are formed a plurality of teeth 22 projecting radially inwardly and at regular intervals at the periphery. In accordance with the 31 days of a long month, 31 teeth 22 are formed in the following steps: 360 ° / 31 = approximately every 11.6 °. Teeth 22 are pushed once per day by a day advancing finger 47b of a day advancing ratchet 47 described below and configured to rotate once per day. Therefore, the date indicator 20 rotates in the CW direction and performs one rotation per month.

A date jumper 25 indexes the position in the rotational direction of the date indicator 20, and assists in the rotation of the date indicator 20. The proximal end of the date jumper 25 is fixed to the plate 5, and its distal end 25a is formed as a free end. The date jumper 25 is equipped with a date arm 25b capable of being elastically deformed. The date arm 25b compresses the distal end 25a towards the date indicator 20. The distal end 25a of the date jumper 25 engages a tooth 22 of the date indicator 20, thereby indexing the rotation. of the date indicator 20. Therefore, the date indicator 20 can be rotated step by step at the same angular step as that corresponding to the angle of the tooth 22 (approximately 11.6 °).

On the inner peripheral surface 20a of the date indicator 20 and at the rear of the teeth 22, is formed a month advancing part 26. The month advancing part 26 is formed to protrude internally in the radial direction. The month advancing part 26 pushes a tooth 28a of an intermediate month wheel 28 provided inside the date indicator 20 when a switchover is made from the last day of a month to the first day of the month. following month, thus turning the intermediate wheel of the 28 months.

Further, on the inner peripheral surface 20a of the date indicator 20 and on the rear side of the teeth 22, a thirtieth date determining part 29 is formed. The thirtieth date determining part 29 is formed as an outward recess in the radial direction. The thirtieth date determining part 29 is formed at a position corresponding to a distal end 74a of a thirtieth date determining lever 74 described below provided on the inner side of the date indicator 20 when the date indicator. date displays the thirtieth date. When the month change passage is performed from the thirtieth date, which is the end of a short month, to the first day of the following month, the thirtieth date determining part 29 makes it possible to follow the switching by the distal end 74a of the thirtieth date determination lever 74 penetrating therein.

(Wheel of months)

The month indicator 30 is inserted into the hours wheel 16 with play to be mobile in rotation. The 30-month wheel has a 31-month gear and a 33-month cam. The 30-month wheel rotates per year.

The toothed wheel of the months 31 meshes with the intermediate wheel of the months 28. In accordance with the 12 months constituting the year, the toothed wheel of the months 31 has 12 teeth spaced in the following steps: 360 ° / 12 = 30 °. The month gear 31 rotates with the rotation of the date indicator 20 and the month intermediate wheel 28 at the end of each month. In Fig. 2, to make the drawing easier to understand, the number of each month corresponding to each tooth of the month gear 31 is indicated.

The month cam 33 rotates per year synchronously with the month toothed wheel 31 around the center axis O. The outer peripheral surface of the month cam 33 has five projections 34a in the peripheral direction , and five recesses 34b (corresponding to the "short month determining part" in the claims) located between the projections 34a.

The plurality of protrusions 34a of the month cam 33 are formed at positions corresponding to the long months (January, March, May, July, August, October and December) when the outer peripheral surface of the month cam 33 is divided into 12 equal sectors corresponding to an angle of 30 ° around the axis of center O and the months from January to December are successively assigned to each of these sectors in the CW direction. The plurality of notches 34b of the month cam 33 are formed at the positions corresponding to the short months (February, April, June, September, and November).

A month display disk 15 is inserted on the end of the month wheel 30, on the rear side. The month display disc 15 is a disc-shaped plate, and is arranged on the front side of the movement 10 relative to the dial 11. As shown in Fig. 2, on the main surface of the date indicator 20, month letters 15a are successively displayed representing the months from January to December along the peripheral direction. Examples for the month letter display method 15a include printing, marking, and sealing, without this listing being restrictive. The month display disc 15 rotates per year in the CCW direction around the center axis O in synchronization with the month toothed wheel 31 and the month cam 33. The letters of the months 15a are displayed successively. in accordance with the rotational direction of the month display disk 15, and are visible from the outside through the month window 11 b.

A month jumper 35 adjusts the position in the rotational direction of the month wheel 30, and assists in the rotation of the month wheel 30. The proximal end of the month jumper 35 is rotatably connected to the plate 5, and its distal end 35a is formed as a free end. The distal end 35a of the month jumper 35 is compressed towards the month wheel 30 by a month jumper spring 36. The distal end 35a of the month jumper 35 is engaged with the teeth of the month wheel 30, adjusting in this way the rotation of the month wheel 30. Consequently, the month gear 31, the month cam 33, and the month display disk 15 of the month wheel 30 are rotated by one step per month. in the CCW direction at the same angle of 30 ° as the angle of the tooth (30 °) around the axis of center O, performing one rotation per year.

(Main mechanism for controlling date indicator)

Figure 4 is a sectional view taken along line B-B of Figure 2, and Figure 5 is an enlarged plan view of the main date indicator control mechanism.

As shown in Figures 2, 4, and 5, in a position between the axis of center O and the inner peripheral surface 20a of the date indicator 20 and corresponding to the direction of 5 o'clock, a shaft 6 protrudes vertically from the plate 5 along a first axis C1. The main date indicator control mechanism 40 is rotatably supported about the first axis C1 by the shaft 6.

The main date indicator control mechanism 40 is equipped with a date pin 41, a date indicator drive wheel 43, an actuating cam 50, a actuating cam lever 52, a day advancement ratchet 47, and a control cam 45. The date pin 41, the date indicator drive wheel 43, the date cam actuation 50, the day advancement ratchet 47, and the control cam 45 are arranged coaxially to rotate about the first axis C1.

The date pin 41 is formed in a tubular configuration, and is simply inserted into the shaft 6 so as to be rotatable about the first axis C1.

The date indicator drive wheel 43 is simply inserted on the date pin 41 to be rotatable. The date indicator drive wheel 43 meshes with the intermediate wheel 17. The energy from the hour wheel 16 is transmitted to the date indicator drive wheel 43 via the intermediate hour wheel 16b and the hour wheel 16b. intermediate wheel 17. The date indicator drive wheel 43 rotates once per day at a fixed speed about the first axis C1.

In addition, the date indicator drive wheel 43 is provided with an arcuate groove 43a at the center of which is the first axis C1 in the plan view, and the width of which extends in the radial direction of the date indicator drive wheel 43. The center angle of the arcuate groove 43a is, for example, approximately 90 °.

The actuating cam 50 is a plate configured in the form of a sector as a whole, and is smaller than the outline of the date indicator drive wheel 43. On the front side of the drive wheel date indicator 43, the actuation cam 50 is stacked on the date indicator drive wheel 43. The actuation cam 50 is inserted and fixed on the date pin 41. Therefore, the cam actuator 50 is rotatably mounted about the first axis C1 relative to the date indicator drive wheel 43.

The actuating cam 50 is equipped with an actuating cam surface 50a formed in an arcuate configuration, a compression surface 50b on which acts an actuating cam lever 52 described below, and a bulging portion 50c penetrating into a distal end 53 of the actuating cam lever 52. The actuating cam surface 50a is arranged so that its radius gradually decreases as it extends in the CW direction. The compression surface 50b is arranged such that it faces, in the CCW direction, one end of the actuating cam surface 50a. The bulged part 50c is arranged on the side opposite to the actuating cam surface 50a in the radial direction with respect to the first axis C1, and the bulge is oriented outwards in the radial direction.

The actuating cam 50 is equipped with a regulating pin 51 projecting from the rear side of the movement 10 along the axial direction. The regulating pin 51 is inserted into and seated in the groove 43a of the date indicator drive wheel 43. The regulating pin 51 has a diameter smaller than the width of the groove 43a, and is simply inserted into the groove 43a; at the same time, it can move in the groove 43a along the peripheral direction.

By means of the rotation in the CW direction of the date indicator drive wheel 43, the regulating pin 51 adjoins the end of the groove 43a in the CCW direction. In the state in which the regulating pin 51 abuts the end of the groove 43a, the date indicator drive wheel 43 rotates in the CW direction, the actuating cam 50 being rotatably mounted in the CW direction. with the date indicator drive wheel 43.

When the compression surface 50b of the actuating cam 50 is compressed by the actuating cam lever 52 described below, the regulating pin 51 moves inwardly of the groove 43a in the direction CW at a higher speed than that of rotation of the date indicator drive wheel 43. Therefore, the actuating cam 50 can be rotated in the CW direction relative to the drive wheel d. Date indicator 43 at a predetermined angle (approximately 90 ° according to the present embodiment) corresponding to the range of formation of the groove 43a.

As a whole, the actuating cam lever 52 is formed in an L-shaped configuration. The actuating cam lever 52 can be rotated when pivoted on the plate 5. The lever actuator cam 52 is compressed by an actuator cam lever spring 54 such that the distal end 53 moves toward the actuator cam 50. The distal end 53 of the actuator cam lever the actuator 52 comes into sliding contact with the actuating cam surface 50a and the pressing surface 50b of the actuating cam 50; at the same time, with the rotation of the actuating cam lever 52, it moves to and from the first axis C1, which is the center of rotation of the actuating cam 50.

At the distal end 53 of the actuating cam lever 52, are formed a first projection 53a projecting in the direction of the actuating cam 50, and a second projection 53b arranged at the end proximal of the actuating cam lever 52 to the first projection 53a. As the actuation cam 50 rotates in the CW direction, the second protrusion 53b of the distal end 53 of the actuation cam lever 52 slidably contacts the actuation cam surface 50a. At a predetermined time around 0 o'clock am, when the date is changed, the second projection 53b of the distal end 53 of the actuation cam lever 52 reaches the compression surface 50b of the actuation cam 50, and comes to compress compressing surface 50b by the compressive force of the actuating cam lever spring 54. As a result, the actuating cam 50 can instantly rotate in the CW direction relative to the indicator drive wheel. date 43 at a predetermined angle (which is approximately 90 ° according to the present embodiment) corresponding to the range of formation of the groove 43a of the date indicator drive wheel 43. Further, the cam cam actuator 50 rotates through a predetermined angle, and then the swelling portion 50c enters between the first protrusion 53a and the second protrusion 53b of the actuating cam lever 52, and is temporarily retained therein.

The day advancement ratchet 47 is composed of a day advancement ratchet toothed wheel 47a in the form of a disc and of a day advancement finger 47b. The day advancing ratchet 47 is inserted and fixed on the end of the rear side of the date pin 41, and rotates in synchronization with the actuating cam 50.

The day advancement ratchet toothed wheel 47a is inserted on the date pin 41 and fixed thereto. Teeth are formed on the outer peripheral surface of the day advancement ratchet sprocket 47a. The day advancing ratchet toothed wheel 47a can be meshed with an intermediate date wheel 85 of the short month date indicator control mechanism 70 described below.

On the rear side of the day advance ratchet toothed wheel 47a, the day advance finger 47b is inserted and fixed on the date pin 41. On the outer peripheral surface of the day advance finger 47b, a finger 47c is formed projecting outwardly in the radial direction so as to be able to engage the teeth 22 of the date indicator 20. At a predetermined time of around 0 o'clock am, when the date changes, the day advancement ratchet 47 rotates synchronously with the instantaneous rotation of the actuating cam 50. Consequently, the day advancement finger 47b acts against the tooth 22 of the date indicator. 20 to turn it one step in the CW direction.

The control cam 45 is rotatably superimposed on the date indicator drive wheel 43, and is arranged between the date indicator drive wheel 43 and the day advancement ratchet 47 Control cam 45 is inserted over and attached to date pin 41, and rotates synchronously with actuating cam 50 and day advancement ratchet 47. A distal end 73a of a Day advancement determining lever 73 provided on the short month calendar indicator control mechanism 70 described below makes sliding contact with the outer peripheral surface of the control cam 45.

A day advancement determining part 46 is formed on the outer peripheral surface of the control cam 45. The day advancement determining part 46 is formed to be pressed into the inner side in the radial direction. . A side surface 46a in the CW direction of the daylight advancement determining portion 46 is formed to extend along the radial direction. A side surface 46b in the CCW direction of the day advancement determining part 46 is inclined in the CCW direction from the inside to the outside in the radial direction, so that the opening of the day advancement determining part The advancement of day 46 is broadened. When the month change passage is performed on the thirtieth calendar, which is the last day of a short month, on the first day of the following month, the distal end 73a of the day advancement determining lever 73 enters the day progress determining part 46 and comes into sliding contact with it.

(Short month calendar indicator control mechanism)

In a position located between the center axis O and the inner peripheral surface 20a of the date indicator 20, corresponding to the direction of 7 o'clock, a shaft 7 protrudes vertically from the plate 5 along a second axis C2 (which corresponds to the “predetermined axis” in the claims).

The short month calendar indicator control mechanism 70 comprises an actuating lever 71, a short month day advancement ratchet 76, and the intermediate date wheel 85.

The actuating lever 71 is a flat member similar to a plate formed, for example, from a metal material. The operating lever 71 is simply inserted into a tubular portion 77 of the short month day advancement ratchet 76 described below which is loosely inserted into the shaft 7, and is supported by the shaft 7 to be. movable in rotation about the second axis C2. The actuating lever 71 is compressed in the CCW direction about the second axis C2 by an actuating lever spring 72 arranged outwardly in the radial direction of the actuating lever 71.

The actuating lever 71 is equipped with a regulating pin 71a, a day advance determination lever 73, a thirtieth date determination lever 74, and a determination lever month short 75. The day advancement determining lever 73, the thirtieth calendar determining lever 74, and the short month determining lever 75 are integrally formed.

The regulating pin 71a is arranged such that it rises towards the rear in the vicinity of the second axis C2. The regulating pin 71a is inserted into a groove 78a of a finger gear 78 of a short month day advancement ratchet 76 such as that described below, and is arranged therein to index the rotation of the ratchet. short month day advancement 76.

The distal end 73a of the day advancement determining lever 73 is formed to be bent towards the control cam 45. The distal end 73a of the day advancement determining lever 73 is kept in contact with the outer peripheral surface of the control cam 45 by the compressive force of the spring of the actuating lever 72, and, by the rotation of the control cam 45, comes into sliding contact with the outer peripheral surface of the control cam 45. When the thirtieth day, which is the last day of a short month, is changed to the first day of the following month (for example, between 11:55 p.m. and midnight of the last day of a short month), l the distal end 73a of the day advancement determining lever 73 tends to enter the day advancement determining portion 46 of the control cam 45, and is slidably contacted therewith by the compressive force of the actuating lever spring 72.

FIG. 6 is an enlarged plan view of the thirtieth date setting lever and of the short month day advancement ratchet.

The distal end 74a of the thirtieth date setting lever 74 is formed such that it is curved towards the inner peripheral surface 20a of the date indicator 20. The distal end 74a of the date setting lever. thirtieth date 74 is spaced from the inner peripheral surface 20a of the date indicator 20 by a predetermined distance. When the date indicator 20 displays the thirtieth date, the distal end 74a of the thirtieth date determining lever 74 is arranged to be in a position corresponding to the thirtieth date determining part 29 of the date indicator 20. (see figure 6).

The short month determination lever 75 extends between the center axis O and the first axis C1 in a plan view, and its distal end 75a is formed such that it is curved towards the cam month 33. The distal end 75a of the short month setting lever 75 is spaced from the outer peripheral surface of the month cam 33 by a predetermined distance. In a long month, the distal end 75a of the short month setting lever 75 is in a position corresponding to the protrusion 34a of each month; in a short month, it is in a position corresponding to notch 34b of each month.

[0071] Figure 7 is a plan view illustrating the state at approximately 11.50 p.m. on the last day for day changes in a short month, and Figure 8 is a plan view illustrating the state at 23 hours 55 minutes on the last day for day changes of a short month.

As shown in Fig. 2, when the distal end 73a of the day advancement determining lever 73 is in sliding contact with the region of the control cam 45 other than the day advancement determining part. 46, the actuating lever 71 is arranged to be in a position (hereinafter referred to as the "first position") inclined in the CW direction about the second axis C2 against the compressive force of the spring of the operating lever 72.

In addition, as shown in Figure 7, as for the actuating lever 71, during the thirtieth date, which is the last day of a short month, the distal end 75a of the short month determination lever 75 is arranged in a position corresponding to the notch 34b, and the distal end 74a of the thirtieth date determining lever 74 is arranged to be in a position corresponding to the thirtieth date determining part 29.

And, as shown in Figure 8, when the thirtieth date, which is the last day of a short month, is changed to go to the first day of the following month (for example, between 23 hours 55 minutes and 24 hours the last day of a short month), the distal end 73a of the day advancement determining lever 73 enters the day advancement determining portion 46, and comes into sliding contact therewith, and The distal end 74a of the thirtieth date determining lever 74 enters the thirtieth date determining part 29 to follow it, and the distal end 75a of the short month determining lever 75 enters the notch 34b of the date cam. 33 months to follow it. When the distal end 73a of the day advancement determining lever 73 enters the day advancement determining portion 46 to slidably contact it, the actuating lever 71 is arranged to be in a position. (hereinafter referred to as the "second position") further inclined in the CCW direction than the first position about the second axis C2 by the compressive force of the spring of the operating lever 72.

As shown in Fig. 6, the short month day advancement ratchet 76 has a tubular portion 77, a finger gear 78, a finger plate 79, and a return spring link portion 80. The tubular portion 77, the finger gear 78, the finger plate 79, and the return spring link portion 80 are attached to each other integrally, and rotate about the second axis C2 of synchronized with each other.

The tubular part 77 is inserted in a rotary manner on the shaft 7.

The rear side of the actuating lever 71 is simply inserted without clamping, that is to say via a greasy clamping, the finger toothed wheel 78 in the tubular part 77, which thus remains fixed on the tubular portion 77. On the outer peripheral surface of the finger gear 78, a plurality of teeth are formed in the peripheral direction. The finger toothed wheel 78 is provided with an arcuate groove 78a, the center of which is formed by the second axis C2 in plan view, and the width of which extends in the radial direction of the finger toothed wheel 78. The center angle of the groove 78a formed in an arcuate configuration is, for example, approximately 90 °. The regulating pin 71a projecting vertically from the operating lever 71 is inserted into the groove 78a and arranged to be movable.

The finger plate 79 is attached to the finger gear 78 on the rear side of the finger gear 78. The finger plate 79 mainly comprises a base 79a, a short month day advancement finger 79b , and an elastic support 79c.

The base 79a is intended to cover the majority of the finger gear 78, and has a finger groove 79d extending along the radial direction.

The short month day advancing finger 79b has an elongated shape in the radial direction, and projects outwardly from the finger gear 78 in the radial direction. In a position preceding the change of date (which is referred to hereafter simply as the „pre-advancement position“), before it comes to act on the teeth 22 of the date indicator 20 to do so rotating, the short month day advancing finger 79b is pointed in the direction of 6 o'clock approximately. The short month day advancing finger 79b is located in the finger groove 79d, and is movable along the radial direction. The CW side surface of the short month day advancing finger 79b is formed as a flat surface, and can be engaged with the teeth 22 of the date indicator 20. The CCW side surface of the finger 79b is a curved surface, which can be separated from the teeth 22 of the date indicator 20.

As a whole, the elastic support 79c is formed in a C-shaped configuration capable of elastic deformation, and connects the base 79a to the short month day advancement finger 79b. The elastic holder 79c resiliently supports the short month day advancing finger 79b so that it can move in the finger groove 79d inwardly in the radial direction.

The return spring link part 80 is an element formed in a tubular configuration, and is inserted and fixed on the tubular part 77 on the front side of the actuating lever 71.

A return spring 82 (which corresponds to the "compression means" in the claims) is connected to the return spring link portion 80. The return spring 82 is configured in the form of an extending spiral. along an Archimedean spiral whose center is, for example, the second axis C2. The inner end of the spiral return spring 82 is attached to the return spring linkage portion 80, and its outer end is attached to a stationary pin 84 protruding vertically from the stage 5.

The return spring 82 acts on the finger toothed wheel 78 of the short month day advancement ratchet 76 in the CCW direction towards the pre-date change position from the position following the date change (at which is referred to hereinafter simply as the "post-change position") after the short month day advancing finger 79b has acted on the teeth 22 of the date indicator 20 to rotate it.

The return spring 82 is attached to the return spring connecting portion 80 and the stationary pin 84 while compressing the short month day advancement ratchet 76 in the CCW direction. The short month day advancement ratchet 76 is rotatably indexed in the CCW direction and is held in position when the regulating pin 71a of the actuating lever 71 abuts the CCW end of the groove 78a of the finger gear 78.

As shown in Figures 2 and 4, the intermediate date wheel 85 is arranged movable in rotation relative to the actuating lever 71 about a third axis C3 between the first axis C1 and the second axis C2. The intermediate date wheel 85 meshes with the finger gear 78 of the short month day advancement ratchet 76.

The intermediate date wheel 85 is separated from the day advancement ratchet 47 in the first position where the actuating lever 71 is inclined in the CW direction about the second axis C2. Further, the intermediate date wheel 85 is engaged with the day advancing ratchet 47 in the second position where the operating lever 71 is tilted in the CCW direction about the second axis C2.

(Operation)

In what follows, we will describe the operation of the calendar mechanism 100 described, and in particular how the calendar mechanism 100 passes from the last day of a month to the first day of the following month.

FIG. 9 is a diagram illustrating the energy transmission path in the calendar mechanism. In Figure 9, the solid arrow indicates the direction of energy transmission.

Figures 10 to 15 are plan views illustrating the state around 24 hours for a date change on the last day of a short month; the drawings are given sequentially in the order of Figures 10 to 15. As to the part numbers of the components of the calendar mechanism 100 described below, the drawings refer to them where appropriate.

First, we will describe the operation of the calendar mechanism 100 until the first day of the following month which is reached from the last day of a short month. In the following, we describe, by way of example, the operation of the calendar mechanism 100 when a transition is made from the last day of April (April 30), which is a short month, to the first day of May ( May 1), which is a month long. In the following description, the operation of the calendar mechanism 100 on the last day of a short month corresponds to the operation of the calendar mechanism 100 on the last day of April, June, September, and November, with February constituting an exception.

As illustrated in FIG. 7, the inscription of days 21 of "30" indicating the thirtieth date is displayed through the date window 11a. In addition, the month letters 15a „APR“ indicating here the month of April, which is a short month, are displayed through the month window 11b. The distal end 75a of the short month setting lever 75 is arranged to be in a position corresponding to the April notch 34b, which is a short month.

The energy of the energy source (not shown) such as a motor and a movement barrel is transmitted to the date indicator drive wheel 43 of the main date indicator control mechanism 40 via the cog consisting of the hour wheel 16, the intermediate wheel 17, etc. (see figure 9). Therefore, the date indicator drive wheel 43 of the date indicator main control mechanism 40 rotates in the CW direction about the first axis C1 at a speed of one full rotation per day.

In the state in which the regulating pin 51 adjoins the end of the groove 43a, the actuating cam 50 rotates in the CW direction with the date indicator drive wheel 43. Therefore, the day advancement ratchet 47 and the control cam 45 of the main date indicator control mechanism 40 rotate in the CW direction about the first axis C1 at a speed of one rotation per day in synchronization with the wheel date indicator drive 43 and the actuating cam 50.

Further, the second projection 53b of the actuating cam lever 52 comes into sliding contact with the actuating cam surface 50a through the rotation of the actuating cam 50.

At this time, the distal end 73a of the day advancement determining lever 73 of the actuating lever 71 is brought into sliding contact with the area of the control cam 45 other than the determining part. day advancement 46. The actuating lever 71 is arranged in the first position where it is inclined in the CW direction about the second axis C2. The intermediate date wheel 85 is spaced from the day advancement ratchet 47.

Then, when the day advancement ratchet 47, the control cam 45, the date indicator drive wheel 43, and the actuating cam 50 still rotate in the CW direction with the time which passes, the distal end 73a of the day advancement determining lever 73 reaches the day advancement determining portion 46 of the control cam 45.

Then, as shown in Figure 8, when 23 hours 55 minutes is reached, the distal end 73a of the day advancement determining lever 73 enters the day advancement determining portion 46 of the control cam 45 due to the compressive force of the operation lever member spring 72. Further, the distal end 74a of the thirtieth date determining lever 74 enters the interior of the determining portion. thirtieth date 29 and follows the latter. Further, the distal end 75a of the short month setting lever 75 enters the notch 34b of the month cam 33 and follows the latter. Therefore, the operating lever 71 rotates in the CCW direction around the second axis C2, and moves from the first position, where it is tilted in the CW direction around the second axis C2, to the second position where it is tilted. in the CCW direction around the second axis C2. The intermediate date wheel 85 moves with the rotation of the operating lever 71, and engages the day advancement ratchet 47.

Furthermore, the second projection 53b of the actuating cam lever 52 reaches the compression surface 50b by means of the rotation of the actuating cam 50.

[0100] Then, as shown in Fig. 10, when 24 hours is reached, the second projection 53b of the actuating cam lever 52 acts on the pressure surface 50b of the actuating cam 50 due to the force of compression of the actuating cam lever spring 54. As a result, the day advancing ratchet 47, the control cam 45, and the actuating cam 50 of the date indicator main control mechanism 40 rotate in. CW direction at a speed greater than that of the date indicator drive wheel 43.

[0101] In addition, with the energy transmitted by the day advancement ratchet 47, the intermediate date wheel 85 rotates at high speed in the CCW direction around the third axis C3, and the finger toothed wheel 78 of the ratchet short month day advancement 76, meshed with intermediate date wheel 85, rotates at high speed in the CW direction against the compressive force of return spring 82.

[0102] Then, as shown in Fig. 11, the short month day advancing finger 79b of the short month day advancing ratchet 76 rotates at high speed in the CW direction around the second axis C2, and comes resting against the teeth 22 of the date indicator 20. The short month day advancement finger 79b of the short month day advancement ratchet 76 acts in compression on the teeth 22 of the date indicator 20 The date indicator 20 is released from the date jumper 25, and caused to rotate in the CW direction around the axis of center O.

[0103] Further, with the rotation of the date indicator 20, the thirtieth date determining part 29 moves in the CW direction. At this time, the distal end 74a of the thirtieth date determining lever 74, which has been positioned within the thirtieth date determining part 29, moves along the thirtieth date determining part. 29, and tends to exit from the thirtieth date determining part 29. Further, the operation lever 71 rotates in the CW direction about the second axis C2.

[0104] Then, as shown in FIG. 12, the date indicator 20 engages again with the date jumper 25, and rotates one notch in the CW direction around the center axis O. The date inscription 21 displayed in the date window 11a is changed from "30" to "31."

[0105] Further, the distal end 74a of the thirtieth date determining lever 74 exits from the thirtieth date determining part 29 while being in sliding contact therewith. Therefore, the operating lever 71 rotates in the CW direction around the second axis C2 from the second position where it is tilted in the CCW direction around the second axis C2 to the first position where it is tilted in the CW direction around the second axis. second axis C2. Therefore, the date intermediate wheel 85 is separated from the day advancing ratchet 47. Further, with respect to the short month day advancing ratchet 76, power transmission to the latter from the ratchet. day advancement via the intermediate date wheel 85 is now released.

[0106] In this position, the short month day advancement ratchet 76 is compressed from the post-date change position to the pre-change position by the return spring 82. Thus, when the transmission of l energy from the day advancement ratchet 47 is released, the short month day advancement ratchet 76 is rotated at high speed in the CCW direction about the second axis by the compressive force of the return spring 82 Therefore, the short month day advancing finger 79b instantly returns to the pre-change position from the post-change position. The short month day advancing ratchet 76 is resiliently held by the elastic support 79c so that it can be moved inwardly in a radial direction. Therefore, when it returns to the pre-change position from the post-change position, the short month day advancing finger 79b moves inward in the radial direction even when it comes to rest against them. teeth 22 of the date indicator 20. Therefore, an engagement between the short month day advancing finger 79b and the teeth 22 is avoided, so that the date indicator 20 does not reverse-rotate. in the CCW direction.

[0107] Then, as shown in Figure 13, the day advancement ratchet 47, the control cam 45, and the actuating cam 50 of the date indicator main control mechanism 40 rotate at high speed in CW direction around the first axis C1. The finger portion 47c of the day advancement ratchet 47 bears against the teeth 22 of the date indicator 20 and acts in compression thereon.

[0108] Then, as shown in Figure 14, the date indicator 20 is released from the date jumper 25, and rotates in the CW direction around the center axis O. In addition, with the rotation of the date indicator 20, the month advancing part 26 acts on the tooth 28a of an intermediate month wheel 28 provided inside the date indicator 20. Consequently, the intermediate month wheel 28 rotates in CW meaning. Further, the month wheel 30 engaged with the intermediate month wheel 28 is disengaged from the month jumper 35, and rotates in the CCW direction. Therefore, a month display disk 15 displaying month letters 15a rotates synchronously with the month wheel 30.

[0109] Then, as shown in FIG. 15, the date indicator 20 is caused to re-engage with the date jumper 25, and again rotates one notch in the CW direction around the axis of center O. Consequently, the date inscription 21 displayed through the date window 11a is changed from "31" to "1."

[0110] In addition, the month wheel 30 is brought to engage again with the month jumper 35, and rotates one notch in the CCW direction around the center axis O. The display disc month 15 displaying the month letters 15a rotates one notch in the CCW direction around the center axis O in synchronization with the month wheel 30. The month letters 15a displayed in the month window 11b are changed from “APR” representing the month of April to “MAY” representing the month of May.

[0111] Thus, the transition from the last day of April, which is a short month, to the first day of May, which is a long month, performed by the calendar mechanism 100, is completed.

[0112] FIG. 16 is a plan view illustrating the state around 23 hours and 55 minutes during the thirtieth date for the change of day during a long month.

[0113] FIG. 17 is a plan view illustrating the state at around 24 hours during the thirtieth date for the day change during a long month, with the date change being made halfway.

[0114] FIG. 18 is a plan view illustrating the state around 24 hours during the thirtieth date for the change of day during a long month, with the change of date effected in its entirety.

In what follows will be given, by way of example, the mode of operation of the calendar mechanism 100 when a transition is effected from the thirtieth day of the month of May, which is a long month, to the first day of June (June 1), which is a short month, on the thirty-first day of May. For anything related to any operation which is the same as described above of the calendar mechanism 100 for a transition from the last day of April, which is a short month, to the first day of May, which is a long month, reference will be made to the above without once again providing a detailed description.

As shown in FIG. 16, the date inscription 21 of "30", indicating the thirtieth date, is displayed in the date window 11a. In month window 11b, the month letters 15a of "MAY" indicating May, which is a long month, are displayed.

Furthermore, since the date indicator 20 displays the thirtieth date, the distal end 74a of the thirtieth date determining lever 74 is arranged to be in a position corresponding to the thirtieth date determining part 29 of the date indicator 20.

[0118] Further, the distal end 75a of the short month setting lever 75 is arranged to be in a position corresponding to the protrusion 34a of May, which is one month long.

When the time passes, the day advancement ratchet 47, the control cam 45, the date indicator drive wheel 43, and the actuating cam 50 rotate in the CW direction. The distal end 73a of the day advancement determining lever 73 reaches the day advancement determining portion 46 of the control cam 45.

[0120] Then, as shown in FIG. 16, when 23 hours 55 minutes are reached on the thirtieth date, the distal end 73a of the day advancement determining lever 73 tends to enter the determining part of the day. day advance 46 of the control cam 45 due to the compressive force exerted by the operation lever element spring 72.

In this position, the distal end 75a of the short month determining lever 75 is arranged in a position corresponding to the projection 34a. Therefore, with respect to the actuating lever 71, the distal end 75a of the short month determining lever 75 abuts against the protrusion 34a, and its rotation in the CCW direction (i.e., its movement from the first position to the second position) is indexed. The date intermediate wheel 85 is maintained in a state in which it remains spaced from the day advancing ratchet 47. Thus, the transmission of energy from the day advancing ratchet 47 to the date intermediate wheel 85 and the Finger gear 78 of the short month day advancing ratchet 76 is cut off, and they are held in position without rotating.

[0122] Then, when 24 hours (midnight) is reached during the thirtieth date, the second projection 53b of the actuating cam lever 52 acts against the compression surface 50b of the actuating cam 50 due to the force. of compression exerted by the actuating cam lever spring 54. Accordingly, the day advancing ratchet 47, the control cam 45, and the actuating cam 50 of the date indicator main control mechanism 40 rotate in the CW direction at a speed greater than the date indicator drive wheel 43.

[0123] Then, as shown in FIG. 17, the day advancement ratchet 47, the control cam 45, and the actuating cam 50 of the main date indicator control mechanism 40 rotate in the CW direction. at high speed around the first axis C1. The finger portion 47c of the day advancement ratchet 47 bears against the teeth 22 of the date indicator 20 and exerts a compression thereon. The date indicator 20 is released from the date jumper 25, and rotates in the CW direction around the center axis O. At this time, the distal end 73a of the day advance determination lever 73 is brought into sliding contact with the area of the control cam 45 other than the day advancement determining portion 46.

[0124] Then, as shown in FIG. 18, the date indicator 20 engages again with the date jumper 25, and rotates one notch in the CW direction around the center axis O. The date inscription 21 displayed in the date window 11a is changed from "30" to "31."

[0125] A similar operation is also performed when switching from May 31, which is the last day of a long month, to June 1, which is the first day of a short month. In other words, when 24 hours is reached on May 31, the second projection 53b of the actuating cam lever 52 acts on the compression surface 50b of the actuating cam 50 due to the compressive force of the actuating spring. Actuating cam lever 54. The day advancing ratchet 47, control cam 45, and actuating cam 50 of the main date indicator control mechanism 40 rotate at high speed in the CW direction around of the first axis C1. The finger 47c of the day advancement ratchet 47 bears against the teeth 22 of the date indicator 20 and exerts a compressive force on the latter. Consequently, the date indicator 20 is released from the date jumper 25, and rotates in the CW direction around the axis of center O.

[0126] In addition, with the rotation of the date indicator 20, the month advancement part 26 acts on the tooth 28a of the intermediate month wheel 28 arranged inwardly of the date indicator 20. Therefore, the 28-month intermediate wheel turns in the CW direction. Further, the month wheel 30 engaged with the intermediate month wheel 28 is disengaged from the month jumper 35 and rotates in the CCW direction. Therefore, the month display disk 15 displaying the letters of the months 15a rotates in the CCW direction in synchronization with the month wheel 30.

[0127] Then, the date indicator 20 is again engages with the date jumper 25, and turns one more notch in the CW direction around the axis of center O. Consequently, the date inscription 21 displayed in date window 11a changes from "31" to "1."

[0128] In addition, the month wheel 30 again engages the month jumper, and rotates one notch in the CCW direction around the center axis O. Consequently, the month letters 15a displayed in month window 11b are changed from "MAY", indicating the month of May, to "JUN" indicating the month of June.

[0129] Thus, the transition from the thirtieth day of the month of May, which is a long month, to June 1, which is the first day of a short month, is completely effected thanks to the calendar mechanism 100 via the thirty-first day of May.

[0130] According to the present embodiment, it is possible to operate the calendar mechanism 100 through the actuating lever 71, so that, compared to the technique of the prior art in which four levers are planned, a reduction in the number of components and a structural simplification is achieved.

[0131] Furthermore, the actuating lever 71 is provided with the thirtieth date determining lever 74 and the short month determining lever 75, so that, only by mounting the actuating lever 71, it is possible to arrange the thirtieth date determining lever 74 and the short month determining lever 75 in predetermined positions. In other words, there is no need to perform individual positioning of the thirtieth date setting lever 74 and the short month setting lever 75, so that the production of such a mechanism is facilitated.

[0132] Further, the operating lever 71 rotates from the first position to the second position when the thirtieth date determining lever 74 follows the thirtieth date determining portion 29, and the short month determining lever 75 follows. notch 34b of month cam 33; and the intermediate date wheel 85 engages the day advancing ratchet 47 when in the second position, so that it is possible to transmit the energy of the day advancing ratchet 47 to the day advancement ratchet 47. short month day advancement ratchet 76 through intermediate date wheel 85. Thus, it is possible to rotate date indicator 20 on the last day of a short month through intermediate date advancement ratchet. day 47 and the short month day advancement ratchet 76 to accurately perform the date change.

[0133] Further, the actuating lever 71 is arranged such that the day advancement determining lever 73 is in sliding contact with the outer peripheral surface of the control cam 45, so that it It is possible to generate the tracking of the thirtieth date determining part 29 by the thirtieth date determining lever 74 without however bringing it into contact with the date indicator 20. Consequently, it is possible to suppress the generation of d. a load on the date indicator 20 from the operating lever 71, so that it is possible to prevent a deviation of the date indicator 20 and display a day in a predetermined position.

[0134] In addition, the short month calendar indicator control mechanism 70 is equipped with the return spring 82 which acts in compression on the short month day advancement ratchet 76 from the post-change position. date to the pre-date change position, so that the short month day advancement ratchet 76 can be returned to the pre-advancement position after rotating the date indicator 20 into a short month . Therefore, it is possible to perform a date change with precision by advancing one day also during the following short month.

[0135] Further, the resilient support 79c resiliently supporting the short month day advancing finger 79 is provided to allow radial inward movement of the short month day advancing ratchet 76. , so that, when the short month day advancing finger 79b is returned from the pre-date change position to the post-date change position, it is possible to prevent the date indicator 20 to turn. So, it is possible to rotate the date indicator through the day advancement ratchet 47 and the short month day advancement ratchet 76 at the end of a short month to effect a date change. precisely.

[0136] Thus, there is provided a calendar mechanism 100 as described above which is of a simple structure and which can be produced easily, so that it is possible to have a movement 10 and a workpiece. timepieces 1 which are of better reliability and of low cost price.

(Variants of the previous embodiment)

[0137] Figure 19 is a plan view of a movement equipped with an alternate calendar mechanism, and Figure 20 is a sectional view taken along the line C-C of Figure 19.

In what follows, a variant of the previous embodiment is described.

[0139] The calendar mechanism 100 of the embodiment described above is equipped with the control cam 45 rotatably superimposed on the date indicator drive wheel 43, and the progress determining lever of day 73 is in sliding contact with control cam 45 (see Figures 2 and 4).

[0140] In this way, as shown in Figures 19 and 20, the calendar mechanism 100 according to the variant of the embodiment differs from the above embodiment in that it is not equipped with the cam. day progress control and leverage. In the following, a detailed description of the components which are the same as those of the embodiment described above will therefore not be reiterated.

(Main mechanism for controlling date indicator)

[0141] As shown in Figures 19 and 20, the main date indicator control mechanism 40 is equipped with the date pin 41, the date indicator drive wheel 43, the date cam. actuation 50, actuation cam lever 52, and day advancement ratchet 47.

[0142] The date pin 41 is of a tubular configuration, and is inserted without clamping on the shaft 6 so as to be movable in rotation about the first axis C1. At the intermediate part in the axial direction of the date pin 41 there is a support plate 41a. The backing plate 41a is arranged at the rear of the movement 10 with respect to the date indicator drive wheel 43. The backing plate 41a is configured in the form of a disc in the axial direction, and is of a diameter. diameter smaller than the date indicator drive wheel 43.

[0143] The day advancement ratchet 47 is inserted and fixed on the rear end of the date pin 41. The day advancement ratchet toothed wheel 47a of the day advancement ratchet 47 is arranged in a state in which it is in contact with the support plate 41a.

[0144] The short month calendar indicator control mechanism 70 is equipped with the actuating lever 71.

The actuating lever 71 is equipped with the regulating pin 71a, the thirtieth date determination lever 74, and the short month determination lever 75. The thirtieth date determination lever 74 and the determination lever of short months 75 are arranged integrally with respect to each other.

[0146] The end 74a of the thirtieth date determining lever 74 has a curved shape towards the internal peripheral surface 20a of the date indicator 20. The end 74a of the thirtieth date determining lever 74 is kept in contact with it. the internal peripheral surface 20a of the date indicator 20 by the compressive force of the spring of the actuating lever 72.

When the passage of the month change is made during the thirtieth date, which is the last day of a short month, the distal end 74a of the thirtieth date determination lever 74 enters the thirtieth determination part. date 29 and comes into sliding contact with it to allow it to follow it.

[0148] The short month day advancement finger 79b extends along the radial direction. The short month day advancing finger 79b protrudes outward in the radial direction beyond the finger gear 78, and is aligned approximately in the 9 o'clock direction.

When the distal end 74a of the thirtieth date determining lever 74 is in sliding contact with the area of the internal peripheral surface 20a of the date indicator 20 other than the thirtieth date determining part 29, the lever actuator 71 is arranged to be in the first position where it is inclined in the CW direction around the second axis C2. When the distal end 74a of the thirtieth date determining lever 74 has entered the interior of the thirtieth date determining portion 29 of the date indicator 20, and is in sliding contact therewith, the lever actuator 71 is arranged to be in the second position where it is even more inclined in the CCW direction around the second axis C2 than when it is in the first position.

(Operation)

In what follows, we will describe the operation of the calendar mechanism 100 according to the variant of the embodiment described above, and in particular during a change of month, that is to say during the changeover. from the last day of a month to the first day of the following month.

[0151] Fig. 21 is a plan view illustrating the state around midnight on the last day of the month for a date change during a short month.

[0152] Fig. 22 is a plan view illustrating the state at around 5 hours 55 minutes on the last day of a short month for a date change.

[0153] Figures 23 to 27 are plan views illustrating the state around midnight on the last day of a short month for a date change, the drawings being ordered in a sequence according to the passage of time.

First of all, we will describe the operation of the calendar mechanism 100 during the passage from the last day of a short month to the first day of the following month; As an example, we will describe how the calendar mechanism 100 operates when a transition is made from the last day of April, which is a short month (April 30), to the first day of May, which is a long month ( May 1).

[0155] As represented in FIG. 19, the date inscription 21 of "29" indicating the 29th day is exposed and displayed in the date window 11a. The month letter 15a of „APR“ indicating April, which is a short month, is exposed and displayed in the month window 11b.

[0156] Furthermore, the distal end 75a of the short month determination lever 75 is arranged to be in a position corresponding to the notch of a short month 34b.

Immediately before 24 hours of the 29th day, which is the day preceding the last day for the date change of a short month, the day advancement ratchet 47 and the actuating cam 50 of the mechanism date indicator control main 40 rotate in the CW direction at a speed greater than the date indicator drive wheel 43. The finger 47c of the day advancement ratchet 47 bears against the teeth 22 of the date indicator 20 and acts on them.

[0158] Then, as represented in FIG. 21, at 0 o'clock during the thirtieth date, which is the last day for the date change during a short month, the date indicator 20 rotates by one notch, and the date inscription 21 exposed through the date window 11a is changed from "29" to "30."

[0159] Then, the distal end 74a of the thirtieth date determining lever 74 reaches the thirtieth date determining part 29 of the date indicator 20 and, at the same time, enters the interior of the determining part. date indicator 29 of the date indicator 20 due to the compressive force exerted by the spring of the actuating lever 72. Further, the distal end 75a of the short month setting lever 75 enters the notch 34b of the month cam 33 and follows the latter. Therefore, the operating lever 71 rotates in the CCW direction about the second axis C2, and moves from the first position, where it is inclined in the CW direction relative to the second axis C2, to the second position where it is. even more inclined in the CCW direction with respect to the second axis C2 than when it is in the first position. And, the intermediate date wheel 85 moves in conjunction with the rotation of the operating lever 71, and engages the day advancing ratchet 47.

[0160] The regulating pin 51 of the actuating cam 50 moves in the groove 43a through the high speed movement of the day advancing ratchet 47 and the actuating cam 50, and when after the The elapse of a predetermined period of time (which in the present embodiment is approximately 5 hours and 55 minutes), abuts against the CCW end of the groove 43a of the wheel. date indicator drive 43 rotating at a fixed speed. Therefore, the actuating cam 50 and the day advancement ratchet 47 are at rest without turning until 5 hours 55 minutes during the thirtieth date.

[0161] Then, as shown in FIG. 22, when, for example, the hour of 5 hours 55 minutes is reached during the thirtieth date, the regulating pin 51 of the actuating cam 50 bears against the end of the groove 43a of the date indicator drive wheel 43 in the CCW direction. Therefore, the energy of the date indicator drive wheel 43, rotating in the CW direction at a fixed speed, is transmitted to the actuating cam 50 and the day advancing ratchet 47 via the pin. control 51. The actuating cam 50 and the day advancing ratchet 47 rotate synchronously with the date indicator drive wheel 43. Further, energy is transmitted from the day advancing ratchet. day 47 to the intermediate date wheel 85 engaged with the day advancing ratchet 47, and the intermediate date wheel 85 rotates in the CCW direction at a predetermined speed about a third axis C3.

[0162] As shown in Figure 23, as time passes, finger gear 78 of the short month day advancement ratchet 76, in engagement with intermediate date wheel 85, rotates. in the CW direction at a predetermined speed against the compressive force of the return spring 82.

[0163] Then, as shown in FIG. 24, when 24 hours are reached during the thirtieth date, the short month day advancement finger 79b of the short month day advancement ratchet 76 bears against the teeth 22 of the date indicator 20. And, the short month day advancement finger 79b of the short month day advancement ratchet 76 acts on the teeth 22 of the date indicator 20.

[0164] Then, as shown in Figure 25, the date indicator 20 is released from the date jumper 25, and rotates in the CW direction around the center axis O. In addition, with the rotation of the date indicator 20, the thirtieth date determining part 29 moves in the CW direction. At this time, the distal end 74a of the thirtieth date determining lever 74, which has been positioned inside the thirtieth date determining part 29, tends to exit from the thirtieth date determining part 29. Further, the operating lever 71 rotates in the CW direction about the second axis C2.

[0165] Then, as shown in FIG. 26, the date indicator 20 again engages with the date jumper 25, and rotates one notch in the CW direction around the center axis O. The date inscription 21 displayed in the date window 11a is changed from "30" to "31."

The actuating lever 71 rotates in the CW direction around the second axis C2 from the second position where it is inclined in the CCW direction around the second axis C2 in the direction of the first position where it is inclined in the CW direction around the second axis C2. Therefore, the intermediate date wheel 85 is spaced from the day advancing ratchet 47.

[0167] Further, the power transmission to the short month day advancing ratchet 76 from the day advancing ratchet 47 via the intermediate date wheel 85 is released. The short month day advancing ratchet 76 rotates at high speed in the CCW direction around the second axis due to the compressive force exerted by the return spring 82, and is instantly returned to the pre-change position. date from the post-date change position.

[0168] The second projection 53b of the actuating cam lever 52 reaches the compression surface 50b and acts on the latter due to the rotation of the actuating cam 50. Consequently, the day advancement ratchet 47 and the actuating cam 50 of the main date indicator control mechanism 40 rotate in the CW direction at a speed greater than the date indicator drive wheel 43. The day advancing finger of short month 79b of the short month day advancement ratchet 79b acts on teeth 22 of the date indicator 20. The date indicator 20 is released from the date jumper 25, and rotates in the CW direction around the axis of center O.

[0169] And, as shown in FIG. 27, the date indicator 20 is again engaged with the date jumper 25, and rotates one notch in the CW direction around the center axis O. L ' date entry 21 displayed in date window 11a is changed from "31" to "1."

[0170] In addition, due to the rotation of the date indicator 20, the month advancement part 26 acts on the tooth 28a of the intermediate month wheel 28 arranged inside the month indicator. date 20. Therefore, the letters of the months 15a displayed in the month window 11b are changed from "APR" representing the month of April to "MAY" representing the month of May.

[0171] In this way, the calendar mechanism 100 has completely made the transition from the last day of April, which is a short month, to the first day of May, which is a long month.

[0172] FIG. 28 is an explanatory view illustrating the change of date during a long month.

In what follows we will give, by way of example, the mode of operation of the calendar mechanism 100 for a transition from the thirtieth date of the month of May, which is a long month, to the first date of June, which is the first day of a month long, through the thirty-first day, which is the last day of May. As regards the operations similar to those of the change of date relating to those described in the context of the calendar mechanism 100 of the embodiment described above, and that of the change of date at the end of the short month of the calendar mechanism 100 according to the variant described above, a detailed description will not be repeated.

[0174] As shown in Fig. 28, the distal end 75a of the short month determining lever 75 is arranged in a position corresponding to the protrusion 34a of the long month (which, in Fig. 28, corresponds to the month of May). . The distal end 75a of the short month determining lever 75 abuts the protrusion 34a, and the actuating lever 71 is adjusted in its rotation in the CCW direction (i.e., the movement of the first position towards the second position). The date intermediate wheel 85 is maintained in a state in which it is spaced from the day advancing ratchet 47. Thus, the transmission of energy from the day advancing ratchet 47 to the date intermediate wheel 85 and the wheel Finger tooth 78 of the short month day advancing ratchet 76 is interrupted, and the latter are held in position without being rotated.

[0175] Then, when the predetermined time of the thirtieth date (for example, 24 hours) is reached, the second projection 53b of the actuating cam lever 52 acts on the compression surface 50b of the actuating cam 50 due to the compressive force exerted by the actuating cam lever spring 54. Therefore, the day advancing ratchet 47 and the actuating cam 50 of the date indicator main control mechanism 40 rotate. in the CW direction at a speed greater than the date indicator drive wheel 43. As a result, the date indicator 20 rotates one notch in the CW direction around the center axis O, and the date entry 21 displayed in the date window 11a is changed from "30" to "31."

[0176] When a date change is made on May 31, which is the last day of a long month, to go to June 1, which is the first day of a short month, a similar operation is done. In other words, when 24 hours is reached on May 31st, the second projection 53b of the actuating cam lever 52 acts on the pressure surface 50b of the actuating cam 50 due to the force of the actuator. compression exerted by the actuating cam lever spring 54. Consequently, the date indicator 20 rotates in the CW direction about the center axis O by one notch, and the date inscription 21 displayed in date window 11a changes from "31" to "1".

[0177] Furthermore, due to the rotation of the date indicator 20, the month advancement part 26 acts on the tooth 28a of the intermediate month wheel 28 arranged inside the month indicator. date 20. Therefore, the letters of the months 15a displayed in the month window 11b are changed from "MAY," which represents the month of May, to "JUN," which represents the month of June.

[0178] In this way, the transition is completely effected by the calendar mechanism 100 to go from the thirtieth day of the month of May, which is a long month, to June 1, which is the first day of a month. short, via the thirty-first day of May.

According to the proposed variant of the embodiment, it is possible to obtain the same beneficial effects as those obtained by the embodiment described above. Further, there is no longer a need to provide a control cam, so that it is possible to provide a calendar mechanism 100 allowing further reduction in size and thickness.

[0180] The technical scope of this invention is not restricted to that of the above embodiments but allows various other modifications without departing from the scope of the spirit of the present invention.

[0181] FIG. 29 is an explanatory view illustrating a control cam according to another embodiment.

[0182] The control cam 45 according to the above embodiment is formed so that the side surface 46a in the CW direction of the day advance determining portion 46 extends in the radial direction (see Fig. figure 5).

[0183] On the other hand, as for the control cam 45 shown in Fig. 29, the side surface 46a in the CW direction of the day advancement determining part 46 can be tilted in the CW direction from the inside towards. outside in the radial direction so that the opening of the day advancement determining part 46 can be widened.

[0184] According to this architecture, the distal end 73a of the day advancement determining lever 73 enters the day advancement determining part 46 at a slower speed than in the above embodiment while at the same time. sliding on the inclined side surface 46a. At this time, the operating lever 71 rotates from the first position to the second position at a lower speed than in the above embodiment, so that the day advancing ratchet 47 and the intermediate date wheel 85 engage each other at a slower speed than in the above embodiment. Therefore, it is possible to suppress the wear of the teeth of the day advancing ratchet 47 and the intermediate date wheel 85, so that a calendar mechanism 100 of longer life can be provided.

[0185] FIG. 30 is an external view of a timepiece according to another embodiment, and FIG. 31 is a sectional view of the movement of the timepiece of this other embodiment shown in FIG. figure 30.

[0186] According to the embodiments described above, the month display disk 15 is arranged on the front face of the movement 10 relative to the dial 11, and a month is displayed by exposing the letters of the months 15a of the disk d. displaying the months 15 through the month window 11b (see Figures 1 and 3).

On the other hand, as shown in Figures 30 and 31, a month hand 18 is arranged on the rear face of the movement 10 relative to the dial 11, and a month can be displayed by indicating the numbers 1 to 12 shown on the dial 11 by the month hand 18.

[0188] While in the above embodiment a hairspring is adopted as the return spring 82, this should not be interpreted restrictively. So a coil spring, for example, or a flat spring could also be adopted as return springs.

[0189] Apart from this, it is possible to replace the components of the embodiment described above with known components where appropriate without departing from the scope of the spirit of the present invention.

List of references

[0190] [Fig. 9] 16 HOURS WHEEL 16a HOURS TOOTHWHEEL 16b HOURS INTERMEDIATE WHEEL 17 INTERMEDIATE WHEEL 40 DAY INDICATOR MAIN CONTROL MECHANISM 47b DAY FEEDING FINGER 47a DAY FEEDING RATCHET TOOTHED 45 CONTROL CAM 43 DATE INDICATOR DRIVE WHEEL 50 DRIVE CAM 52 DRIVE CAM LEVER 70 SHORT DATE MONTH INDICATOR CONTROL MECHANISM 71 DRIVE LEVER 85 DATE INTERMEDIATE WHEEL 76 RATCH SHORT DAY OF MONTH 78 FINGER GEAR 82 RETURN SPRING 79b SHORT MONTH DAY ADVANCING FINGER 36 SPRING MONTHS JUMP 35 MONTHS JUMP 33 MONTHS CAM 31 MONTHS TOOTH WHEEL 30 MONTHS WHEEL 25 DATE SLIP 20 DATE INDICATOR 28 MONTH INTERMEDIATE WHEEL 72 DRIVE LEVER SPRING

Claims (6)

1. Calendar mechanism comprising: an indicator of the months (30) rotating per year; a date indicator (20) rotating per month and having a thirtieth date determining part (29) located in a predetermined position at its periphery; a main date indicator control mechanism (40) rotating per day and rotating the date indicator (20); and a short month calendar indicator control mechanism (70) rotating the date indicator (20) at the end of a short month having 30 days or less, in which the month indicator (30) has a month cam (33) having, on its outer peripheral surface, short month determining portions (34b) corresponding to short months; the date indicator main control mechanism (40) is provided with a date indicator drive wheel (43), and has an actuating cam (50) superimposed on said date indicator drive wheel. date indicator (43), and rotatably arranged at a predetermined angle relative to said date indicator drive wheel (43) said date indicator wheel (43) being configured to perform one rotation per day at a fixed speed about a first axis (C1); said main control mechanism further comprising a day advancement ratchet (47) rotating in synchronization with the actuating cam (50) and rotating the date indicator (20); the short month calendar indicator control mechanism (70) is provided with a thirtieth calendar determining lever (74) capable of following the thirtieth calendar determining part (29), and a month determining lever short (75) capable of following parts of short month determinations (34b); said short month calendar indicator control mechanism (70) furthermore has an actuating lever (71) rotating about a second predetermined axis (C2), as well as a ratchet for advancing the day of month short (76) rotating the date indicator (20) at the end of a short month, and an intermediate date wheel (85) mounted on the actuating lever (71) and arranged to be movable in rotation with respect to the latter about a third axis (C3) when it is in engagement with the advancement ratchet short month day (76); the operating lever (71) moves between a first position and a second position when the thirtieth date determining lever (74) follows the thirtieth date determining part (29), and the month determining lever is running (75) follows the short month determination part; and the intermediate date wheel (85) is spaced from the day advancement ratchet (47) when the operating lever (71) is in the first position, and being in engagement with the day advancement ratchet (47) ) when the operating lever (71) is in the second position. 2. Calendar mechanism according to claim 1, wherein the main date indicator control mechanism (40) is equipped with a control cam (45) rotating in synchronization with the actuating cam (50) and having a day advancement determining part (46) on an outer peripheral surface; and the operating lever (71) has a day advance determining lever (73) in sliding contact with the outer peripheral surface of the control cam (45), and when the day advance determining lever ( 73) comes into sliding contact with the day advancement determining part (46), the thirtieth date determining lever (74) follows the thirtieth date determining part (29), and the month determining lever runs (75) follows the short month determination part (34b). The calendar mechanism according to claim 1 or 2, wherein the short month calendar indicator control mechanism (70) is provided with compression means (82) for applying a restoring force to the ratchet. 'short month day advance (76) aiming to bring it from a position preceding the date change, before rotating the date indicator (20), to a position following the date change after having rotated the date indicator (20). The calendar mechanism of claim 3, wherein the short month day advancement ratchet (76) is provided with a short month day advancement finger (79b) acting on a tooth of the indicator. date indicator (20) for rotating the date indicator (20); and wherein a resilient support portion (79c) resiliently supporting the short month day advancing finger (79b) is arranged to be movable in the radial direction of the short month day advancing ratchet (76 ) when the short month day advancing finger (79b) moves from the position corresponding to that following the date change to the position corresponding to that before the date change to come into contact with the tooth. 5. Movement equipped with a calendar mechanism according to claim 4. 6. Timepiece equipped with a movement according to claim 5.