CH712123A2 - Calendar mechanism, movement and timepiece. - Google Patents

Abstract

The present invention relates to a calendar mechanism, a movement, and a timepiece that are simple in structure and can be easily produced. A date indicator (20) having a determination portion of the thirtieth calendar, an indicator of the months (30) rotating per year, a main date indicator control mechanism (40), and a control mechanism of short month calendar 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 a notch (34b) corresponding to the short month; the date indicator main control mechanism (40) has a date indicator drive wheel (43), and a day advance ratchet (47); the short month calendar indicator control mechanism (70) includes an actuating lever (71), a short month advancing ratchet (76), and an intermediate date wheel (85); the operating lever (71) rotates from a first position to a second position when the thirtieth-day determination lever (74) follows the thirtieth-day determination part (29), and the short-month determination lever (75). ) follows the notch (34b); the intermediate date wheel (85) is spaced from the day advance ratchet (47) when the operating lever (71) is in the first position, and meshes with the day advance ratchet (47) when the operating lever (71) is in the second position.

Description

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] This invention relates to a calendar mechanism, a movement, and a timepiece. 2. Description of the Prior Art [0002] With regard to timepieces having a calendar capable of displaying a date, there are known calendar mechanisms in which the correction of the date is reduced to a minimum by performing a two-day calendar change at the end of a short month having 30 days or less (see, for example, Japanese Patent No. 5,105,467).

[0003] This patent document discloses a calendar mechanism equipped with a date disk (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, through the teeth of the first row of internal teeth, the date display, a corrective gear cooperating with the second row of internal teeth to advance the date disc a step closer to the end a short month, and a month change train driving a star-shaped wheel months at the end of each month. As a lever-type element, there is a lever controlled by a tenon of the date disc, a first pivoting lever for operating the date-change train and the month-shift gear, a second pivoting lever for operate the corrector gear, and a lever cooperating with the star-shaped wheel months to control the rotation of the second pivoting lever.

In the art of the prior art, however, the number of lever-type elements is very important and involves a complicated structure, so that one can fear rather high costs. In addition, 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 it can also be feared that the manufacturing process becomes quite complicated. SUMMARY OF THE INVENTION [0005] The present invention has been designed in view of the above problems. An object of the present invention is to provide a calendar mechanism, a movement, and a timepiece that are of a simple structure and that can be produced easily.

To achieve this objective, a calendar mechanism is provided according to the present invention comprising: an indicator of the months rotating per year; a date indicator rotating one month and having a determination portion of the thirtieth calendar defined in a predetermined position at its periphery; a main date indicator control mechanism rotating one 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 includes a month cam having, on its outer peripheral surface, a short month determination portion corresponding to a short month; the main date indicator control mechanism has an actuating cam, superimposed on and rotatably arranged with respect to a date indicator driving wheel, rotating at a constant speed per day and configured to perform a rotation. rotation per day, and a day forward gear rotating synchronously with the actuating cam and rotating the date indicator; the short month indicator control mechanism is provided with a thirtieth calendar determination lever capable of following the determination part of the thirtieth calendar, and a short month determining lever capable of following the month determination part. short, and includes an actuating lever member rotating about a predetermined axis, a short month advancement pin rotating the date indicator at the end of a short month, and a date wheel. intermediate mounted movable in rotation with respect to the actuating lever while meshing with the short month advancement mark; - Actuating lever moves from a first position to a second position when the determination lever of the thirtieth day follows the determination part of the thirtieth day, and the short month determination lever follows the short month determination part; and - the intermediate date wheel is spaced from the forward gear when the operating lever is in the first position, and engaged with the forward gear when the operating lever is in the first gear position. second position.

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 necessary, it It is possible to reduce the number of components and simplify the structure.

In addition, the actuating lever is provided with the determination lever of the thirtieth day and the month determination lever short, so that, only by mounting the actuating lever, the lever for determining the thirtieth day 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 day determination lever and the short month determination lever, so that the production of the mechanism is facilitated.

In addition, the actuating lever rotates from the first position to the second position when the determination lever of the thirtieth day 30 follows the determination portion of thirtieth day and when the short month determination lever follows the part of determination of the short month, and the intermediate date wheel engages with the forward gear when in the second position, so that it is possible to transmit the energy of the forward gear of day at the short month day forwarding mark via the intermediate date wheel. Thus, at the end of a short month, the date indicator is rotated by the forward day mark and the short month forward record, making it possible to accurately perform the check. advancement of the days.

The main date indicator control mechanism is equipped with a control cam rotating synchronously with the actuating cam and having a day progress determination portion at its outer peripheral surface; and the actuating lever has a day advance determining lever in sliding contact with the outer peripheral surface of the control cam, and when the day advance determining lever comes into sliding contact with the determining portion. the day 30, the thirtieth day determination lever follows the determination part of the thirtieth day, and the short month determination lever follows the short month determination part.

According to the present invention, the actuating lever is arranged in such a way that the day advance determining lever comes into sliding contact with the outer peripheral surface of the control cam, so that it is it is possible for the thirtieth calendar determination lever to follow the thirtieth-day determination 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 towards the date indicator, so that it is possible to prevent a deviation of the date indicator, making possible the displaying the date in a predetermined position.

In addition, the month month indicator control mechanism short is equipped with a compression means for applying a restoring force on the short month day forward gear for bringing it for a long time. position before the change of date, that is to say before rotating the date indicator to a position following the change of date is after having rotated the date indicator.

[0013] According to the present invention, the short month day advance ticket can be returned to the position corresponding to the one preceding the date change after driving the date indicator in rotation during a short month. Thus it is possible to accurately make the date changes also for the next short month.

In addition, the short month day forward gear is equipped with a short month day advancement finger pressing against a tooth of the date indicator to rotate the date indicator; and an elastic support resiliently supporting the short month advancement finger is arranged such that it can be radially inwardly displaced from the short month advancement mark when the short month day advance 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 elastically supporting the forward finger of the short month day movable inwards in the radial direction of the short month advancement mark, so that it is possible to reliably prevent an inverse rotation of the date indicator when the short month advancement finger is re-established from its position corresponding to that after the date change to the position before the change of date. dated. Thus, it is possible to rotate the date indicator by the day advance mark and the short month day forward mark at the end of a short month, so that the change of day can be done accurately.

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, there is therefore provided a calendar mechanism of simple structure and easy to manufacture, so that one can obtain a movement and a timepiece of greater reliability and whose manufacturing costs are low.

According to the present invention, it is possible to operate the calendar mechanism by means of 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 to obtain a simpler structure.

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

In addition, the actuating lever is rotated from the first position to the second position when the determination lever of the thirtieth day follows the thirtieth day determination portion, the short month determination lever follows the part of determination of short month, and that the intermediate date wheel engages with the forward gear of day when it is in the second position, so that it is possible to transmit the power of the röchet of day advance at the short month day forwarding mark via the intermediate date wheel. So, at the end of a short month, the date indicator is rotated by the day forward gear and the short month forward gear, which allows a calendar change to be made. precisely.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022]

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

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

Fig. 3 is a sectional view taken along the line A-A of FIG. 2.

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

Fig. 5 is an enlarged plan view of a main date indicator control mechanism.

Fig. 6 is an enlarged plan view of a thirtieth day determination lever and a short month day advance ticket.

Fig. 7 is a plan view illustrating the state around 23 hours 50 minutes on the last day for the change of day in a short month.

Fig. 8 is a plan view illustrating the state around 23 hours 55 minutes on the last day for the change of day in a short month.

Fig. 9 is a diagram illustrating a power transmission path in a calendar mechanism.

Fig. 10 is a plan view illustrating the state around 24 hours on the last day for the change of day in a short month, with a first date change starting.

Fig. 11 is a plan view illustrating the state around 24 hours on the last day for the change of day in a short month, with the first date change half performed.

Fig. 12 is a plan view illustrating 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 illustrating 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 illustrating the state around 24 hours on the last day for day advancement in a short month, with the second date change half performed.

Fig. 15 is a plan view illustrating the state 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 around 23 hours 50 minutes on the thirtieth day for the change of date in a long month.

Fig. 17 is a plan view illustrating the state around 24 hours on the thirtieth day for the change of date in a long month, with the second change of date half performed.

Fig. 18 is a plan view illustrating the state around 24 o'clock on the thirtieth day for the change of date in a long month, with the second date change made.

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 C-C of FIG. 19.

Fig. 21 is a plan view illustrating the state around midnight on the last day for day advancement in a short month.

Fig. 22 is a plan view illustrating the state around 5 hours 55 minutes on the last day for the advancement of a day in a short month.

Fig. 23 is a plan view illustrating the state around 24 hours on the last day for the advancement of a day in a short month, immediately before a first date change.

Fig. 24 is a plan view illustrating the state around 24 hours on the last day for the advancement of a day in a short month, with a first date change starting.

Fig. 25 is a plan view illustrating the state around 24 hours on the last day for the advancement of a day in a short month, with the first change of date half performed.

Fig. 26 is a plan view illustrating the state around 24 hours on the last day for the advancement of a day in a short month, with a second date change starting.

Fig. 27 is a plan view illustrating the state around 24 hours on the last day for the advancement of a day in a short month, with the first date change made.

Fig. 28 is an explanatory view illustrating the change of 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.

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

DESCRIPTION OF THE EMBODIMENTS

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

In what follows, we will describe a mechanical wristwatch (which corresponds to the "timepiece" of the claims, hereinafter it will simply refer to the "timepiece"), and then a Calendar mechanism according to the embodiment will be described in detail. (Timepiece) [0025] The mechanical body including the leading part of a timepiece is generally referred to as the "movement." What is obtained as a complete product by mounting a dial and needles at that time. movement and putting the whole in a timepiece case constitutes the "set" of the timepiece. Of the two faces of a platen 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 is the bottom of the timepiece case, that is to say, the face opposite the dial, is commonly called "front side" of the movement.

Fig. 3 1 is an external view of a timepiece 1 according to the preferred embodiment. In the description which follows, reference will be made to the direction of clockwise in the plan view of FIG. 1 as CW ("clockwise"), and the counter clockwise direction as CCW ("counterclockwise").

As shown in FIG. 1, the entire timepiece 1 of the present embodiment contains, in a timepiece case 3 consisting of a bottom (not shown) and a mirror 2, a movement 10, a dial 11 having a scale or the like indicating hourly information, and indicator hands including a 12 hour hand indicating the time, a minute hand 13 indicating minutes, and a seconds hand 14 indicating seconds. Are arranged in the dial 11 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. Because of this construction, the timepiece 1 can display the time, the day of the month, and the month.

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

As shown in FIGS. 2 and 3, the movement 10 has a plate 5 constituting the base plate of the movement 10. As shown in FIG. 3, on the front face of the plate 5, are arranged at least one exhaust mechanism / regulator (not shown) including a sprung balance, an escapement, an anchor, etc., and front wheel including a second mobile (wheel & pinion) 8, a third mobile (wheel & pinion), a center mobile (wheel & pinion) 9, a motion barrel, etc. The second needle 14 is mounted at one end of the rear side of the second movable 8, which rotates in 60 seconds in the CW direction about a center axis O. The minute hand 13 is mounted at one end of the side. rear of the center mobile 9, which rotates in 60 minutes in the CW direction about the center axis O. (Calendar mechanism) [0030] As shown in Figs. 2 and 3, a calendar mechanism 100 is equipped with an hour wheel 16, a date indicator 20, a month indicator 30, a date indicator main control mechanism 40, and a control mechanism of Short month calendar indicator 70. In the following, the calendar mechanism 100 will be described in detail with reference to the drawings.

In the description that follows, reference will be made to months having 30 days or less (February, April, June, September and November) as short months, and 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 a toothed hour 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 gear 16a and the gear train. 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 includes an intermediate wheel 16 hours behind the hour wheel 16a. The rotation of the hour wheel 16 is transmitted to a main date indicator control mechanism 40 described below via the train consisting of, for example, the intermediate wheel hours 16b and an intermediate wheel 17.

The date indicator 20 is a ring-shaped element rotatably mounted on the plate 5. As shown in FIG. 2, the inscriptions of the days 21 representing the calendar of 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 of the display method for day 21 entries include printing, marking, and sealing, without this enumeration being restrictive. The date indicator 20 rotates in the CW direction. The inscriptions of the days 21 are displayed successively in accordance with the rotational direction of the date indicator 20.

An inner peripheral surface 20a of the date indicator 20 is formed on two stages. On the front side of the movement 10, on the inner peripheral surface 20a of the date indicator 20, a plurality of teeth 22 projecting radially inwards and at regular intervals at the periphery are formed. In agreement with the 31 days that comprise a long month, 31 teeth 22 are formed according to the following steps: 360731 = approximately every 11.6 °. The teeth 22 are pushed once a day by a day advancing finger 47b of a forward advancement pin 47 described below and configured to rotate one day. As a result, the date indicator 20 rotates CW and rotates by month.

A date jumper 25 indexes the position in the rotational direction of the date indicator 20, and helps the rotation of the date indicator 20. The proximal end of the date jumper 25 is fixed to the platen 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 deforming elastically. The date arm 25b compresses the distal end 25a towards the date indicator 20. The distal end 25a of the date jumper 25 is engaged with 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 stepwise at the same angular point as the angle of the tooth 22 (approximately 11.6 °).

On the inner peripheral surface 20a of the date indicator 20 and the back of the teeth 22, is formed an advancement portion of month 26. The advancing portion of the month 26 is formed to project internally. in the radial direction. The advancing part of month 26 pushes a tooth 28a of an intermediate wheel 28 months provided within the date indicator 20 when a switch is made from the last day of a month to the first day of the next month, turning in this way the intermediate wheel of the months 28.

In addition, on the inner peripheral surface 20a of the date indicator 20 and on the rear side of the teeth 22, is formed a determination portion of thirtieth day 29. The thirtieth-day determination portion 29 is formed as an outward recess in the radial direction. The thirtieth-day determination portion 29 is formed at a position corresponding to a distal end 74a of a thirtieth-day determination lever 74 described below provided on the inner side of the date indicator 20 when the date indicator displays the thirtieth day. When the changeover month is effected from the thirtieth day, which is the end of a short month, to the first day of the following month, the thirtieth-day determination portion 29 makes it possible to follow the switching by the distal end 74a of the Thirtieth determination determination lever 74 penetrating it. (Month Wheel) The month indicator 30 is inserted into the hour wheel 16 with play to be rotatable. The 30 month wheel has a 31 month gear and a 33 month cam. The 30 month wheel rotates by year.

The gear 31 months meshes with the intermediate wheel months 28. In accordance with the 12 months constituting the year, the gear 31 months has 12 teeth spaced according to the following steps: 360712 = 30 °. The gear wheel 31 months rotates with the rotation of the date indicator 20 and the intermediate wheel months 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 tooth gear of month 31 is indicated.

The cam of the month 33 rotates by year synchronously with the gear 31 months 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 346 (corresponding to the "short month determining portion" in the claims) located between the projections 34a.

The plurality of projections 34a of the month cam 33 is 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 of January to December are successively attributed to each of these sectors in the CW direction. The plurality of notches 34b of the month cam 33 are formed at positions corresponding to the short months (February, April, June, September, and November).

A month display plate 15 is inserted on the end of the wheel 30 months, the rear side. The month display plate 15 is a disk-shaped plate, and is arranged on the front side of the movement 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 of January to December along the peripheral direction. Examples for the method of displaying 15a month letters include printing, marking, and sealing, without this enumeration being restrictive. The month display plate 15 rotates in the CCW direction about the center axis O synchronously with the month gear 31 and the month cam 33. The letters of the month 15a are displayed successively according to the rotational direction of the display plate of the month 15, and are visible from the outside through the month window 11b.

A jumper months 35 sets the position in the rotational direction of the wheel 30 months, and helps the rotation of the wheel of the month 30. The proximal end of the jumper months 35 is connected rotatably to the platinum 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 spring jumper of the months 36. The distal end 35a of the month jumper 35 is engaged with the teeth of the wheel 30 months, regulating in this way the rotation of the wheel of the 30's months. Therefore, the 31-month gear wheel, the 33-month cam, and the 15-month wheel 15 month display plate rotate one step per month in the CCW direction at the same 30 ° angle as the tooth angle (30 °) around the center axis O, rotating one year. (Main date indicator control mechanism) FIG. 4 is a sectional view taken along the line B-B of FIG. 2, and FIG. 5 is an enlarged plan view of the main date indicator control mechanism.

As shown in FIGS. 2,4, and 5, in a position between the center axis O and the inner peripheral surface 20a of the date indicator 20 and corresponding to the direction of 5 hours, a shaft 6 protrudes vertically from the plate 5 the 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 driving wheel 43, an actuating cam 50, a control lever actuating cam 52, a forward feed nose 47, and a control cam 45. The date pin 41, the date indicator driving wheel 43, the actuating cam 50, the the forward feed nose 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 to be rotatable about the first axis C1.

The date indicator driving wheel 43 is simply inserted into the date pin 41 to be rotatable. The date indicator driving wheel 43 meshes with the intermediate wheel 17. The energy of the hour wheel 16 is transmitted to the date indicator driving wheel 43 via the intermediate hour wheel 16b and the intermediate wheel 17. The date indicator driving wheel 43 rotates daily at a fixed speed around the first axis C1.

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

An actuating cam 50 is a sector-shaped plate as a whole, and is smaller than the contour of the date indicator driving wheel 43. On the front side of the indicator gear wheel date 43, the actuating cam 50 is stacked on the date indicator driving wheel 43. The actuating cam 50 is inserted and fixed on the date pin 41. Therefore, the actuating cam 50 is mounted rotatable about the first axis C1 relative to the driving wheel of the date indicator 43.

The actuating cam 50 is provided with an actuating cam surface 50a formed in an arcuate configuration, a compression surface 50b on which an actuating cam lever 52, described below, and an actuating cam lever 52 are actuated. inflated portion 50c penetrating a distal end 53 of the actuating cam lever 52. The actuating cam surface 50a is arranged such that its radius decreases gradually as it extends in the CW direction. The compression surface 50b is arranged such that it faces, in the CCW direction, at one end of the actuating cam surface 50a. The bulged portion 50c is provided on the opposite side to the actuating cam surface 50a in the radial direction relative to the first axis C1, and the bulge is radially outwardly oriented.

The actuating cam 50 is equipped with a regulating pin 51 projecting from the rearward side of the movement 10 along the axial direction. The control pin 51 is inserted into the groove 43a of the calendar indicator driving wheel 43 and is housed therein. The control 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 driving wheel 43, the regulation pin 51 adjoins the end of the groove 43a in the CCW direction. In the state in which the regulating pin 51 adjoins the end of the groove 43a, the date indicator driving wheel 43 rotates in the CW direction, the actuating cam 50 being rotatively mounted in the CW direction with the driving wheel of date indicator 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 driving wheel 43. Therefore, the actuating cam 50 can be rotated in the CW direction relative to the date indicator driving wheel. 43 at a predetermined angle (approximately 90 ° according to the present embodiment) corresponding to the formation range 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 by the platen 5. The lever actuating cam 52 is compressed by an actuating cam lever spring 54 so that the distal end 53 moves toward the actuating cam 50. The distal end 53 of the cam lever actuation 52 slidably engages 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 towards 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 towards the actuating cam 50, and a second projection 53b arranged at the end. proximal of the actuating cam lever 52 relative to the first projection 53a. When the actuating cam 50 rotates in the CW direction, the second projection 53b of the distal end 53 of the actuating cam lever 52 slidably contacts the actuating cam surface 50a. At a predetermined time around 0 am, when the date is changed, the second projection 53b of the distal end 53 of the actuating cam lever 52 reaches the compression surface 50b of the actuating cam 50, and compresses the compression surface 55b by the compression force of the actuating cam lever spring 54. As a result, the actuating cam 50 can instantaneously rotate in the CW direction relative to the date indicator driving wheel 43 according to a predetermined angle (which is approximately 90 ° according to the present embodiment) corresponding to the formation range of the groove 43a of the calendar indicator driving wheel 43. In addition, the actuating cam 50 rotates according to the present invention. a predetermined angle, and then the bulge portion 50c penetrates between the first projection 53a and the second projection 53b of the actuating cam lever 52, and is temporarily retained there.

[0057] The day advance pin 47 is composed of a disc-shaped day-ahead gear wheel 47a and a day-ahead pin 47b. The forward advancement pin 47 is inserted and fixed on the end of the rear side of the date pin 41, and rotates synchronously with the actuating cam 50.

[0058] The day advance gear wheel 47a is inserted and fixed in the date pin 41. Teeth are formed on the outer peripheral surface of the day advance gear wheel 47a. The forward feed gear 47a can be brought into gear engagement with a date intermediate wheel 85 of the short month calendar indicator control mechanism 70 described below.

On the rear side of the daylight forward gear 47a, the daylighting finger 47b is inserted and fixed in the date pin 41. On the outer peripheral surface of the day advance finger 47b, a finger 47c is formed protruding outward in the radial direction to be able to be engaged with the teeth 22 of the date indicator 20. At a predetermined time of around 0 hours am, when the As the date changes, the forward feed pin 47 rotates synchronously with the instantaneous rotation of the actuating cam 50. Therefore, the forward advancing finger 47b acts against the tooth 22 of the date indicator. 20 to make it turn a notch in the CW direction.

The control cam 45 is superimposed rotating in rotation on the date indicator driving wheel 43, and is arranged between the date indicator driving wheel 43 and the daylight locating pin 47. control 45 is inserted and fixed in the date pin 41, and rotates synchronously with the actuating cam 50 and the day advance pin 47. A distal end 73a of a day advance lever 73 provided on the short month date indicator control mechanism 70 described below comes into sliding contact with the outer peripheral surface of the control cam 45.

A day advance determination portion 46 is formed on the outer peripheral surface of the control cam 45. The day advance determining portion 46 is formed to be driven into the inner side in the radial direction. . A side surface 46a in the CW direction of the day advance determination portion 46 is formed to extend along the radial direction. A side surface 46b in the CCW direction of the day advance determination portion 46 is inclined in the CCW direction from the inside to the outside in the radial direction, so that the opening of the determining portion of 'day progress 46 is enlarged. When the change of month pass is made on the thirtieth day, which is the last day of a short month, on the first day of the following month, the distal end 73a of the day advance lever 73 enters the day 46 progress determination section 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 hours, a shaft 7 protrudes vertically from plate 5 along a second axis C2 (which corresponds to the predetermined axis "in the claims).

The short month calendar indicator control mechanism 70 includes an actuation lever 71, a day advance signal of the short month 76, and the intermediate date wheel 85.

The actuating lever 71 is a flat element similar to a plate formed, for example, of a metal material. The actuating lever 71 is simply inserted into a tubular portion 77 of the short month advancement head 76 described below which is inserted without interference into the shaft 7, and is supported by the shaft 7 to be mobile 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 radially outwardly of the actuating lever 71.

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

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

The distal end 73a of the day advance determining lever 73 is formed to be curved toward the control cam 45. The distal end 73a of the day advance determining lever 73 is kept in contact with the outer peripheral surface of the control cam 45 by the compression force of the spring of the operating lever 72, and, by the rotation of the control cam 45, slidingly engages the outer peripheral surface of the control cam 45. When the thirtieth day, which is the last day of a month runs, is changed to the first day of the following month (for example, between 23.55 and 24.00 on the last day of a short month), the The distal end 73a of the day advance determining lever 73 tends to enter the day advance determination portion 46 of the control cam 45, and is brought into sliding contact therewith by the compressive force. spring release of the operating lever 72.

FIG. 6 is an enlarged plan view of the thirtieth day determination lever and the short month day advance ticket.

The distal end 74a of the thirtieth calendar determination 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 determination 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 day, the distal end 74a of the thirtieth calendar determination lever 74 is arranged to be in a position corresponding to the thirtieth date determination portion 29 of the date indicator 20. (see Fig. 6).

The short month determination lever 75 extends between the center axis O and the first axis C1 according to a plan view, and its distal end 75a is formed such that it is bent towards the cam The distal end 75a of the short month determining 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 determining 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 the notch 34b of each month.

FIG. 7 is a plan view illustrating the state around 23 hours 55 minutes on the last day for day changes in a short month, and FIG. 8 is a plan view illustrating the state around 23 hours 55 minutes on the last day for the day changes of a short month.

As shown in FIG. 2, when the distal end 73a of the day advance determining lever 73 is in sliding contact with the region of the control cam 45 other than the day advance determining portion 46, the operating 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 spring compression force of the operating lever 72.

In addition, as shown in FIG. 7, as for the actuating lever 71, on the thirtieth day, 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-day determination lever 74 is arranged to be in a position corresponding to the thirtieth-day determination portion 29.

And, as shown in FIG. 8, 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 23 hours 55 minutes and 24 hours of the last day of a short month), the distal end 73a of the day advance determining lever 73 comes into and makes sliding contact with the day advance determining portion 46, and the distal end 74a of the thirtieth determination lever. Date 74 enters the thirtieth-day determination portion 29 to follow it, and the distal end 75a of the short month determination lever 75 enters the notch 34b of the month cam 33 to follow it. When the distal end 73a of the day advance determining lever 73 enters the day advance determination portion 46 to make sliding contact with it, the operating lever 71 is arranged to be in a position (which is referred to hereinafter as the "second position") more inclined in the CCW direction than the first position about the second axis C2 by the compression force of the actuating lever spring 72.

As shown in FIG. 6, the short month day advancement pin 76 has a tubular portion 77, a finger gear 78, a finger plate 79, and a return spring connecting portion 80. The tubular portion 77, the wheel toothed finger 78, the finger plate 79, and the return spring connection portion 80 are integrally attached to one another, and rotate about the second axis C2 synchronously with each other. other.

The tubular portion 77 is rotatably inserted on the shaft 7.

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

A 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 advance finger 79b , and an elastic support 79c.

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

The short month advancement finger 79b has an elongated shape in the radial direction, and protrudes outwardly from the finger gear 78 in the radial direction. In a position preceding the change of date (which is referred to hereinafter simply as the "pre-advancement position"), before it comes to act on the teeth 22 of the date indicator 20 to do so. turn, the short month day advance finger 79b is steered approximately in the 6 o'clock direction. The short month advancement finger 79b is in the finger groove 79d, and is movable along the radial direction. The CW side surface of the short month advancement finger 79b is formed as a flat surface, and can be engaged with the teeth 22 of the date indicator 20. The lateral surface in the CCW direction of the finger The short month day advance 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 advance finger 79b. The elastic support 79c resiliently supports the short month advancement finger 79b so that it can move in the finger groove 79d radially inwardly.

The return spring connecting portion 80 is a member formed in a tubular configuration, and is inserted and fixed on the tubular portion 77 on the front side of the actuating lever 71.

A return spring 82 (which corresponds to the "means of decompression" in the claims) is connected to the return spring connection portion 80. The return spring 82 is a spiral formed to extend along an Archimedean spiral whose center is, for example, the second axis C2. The inner end of the balance spring 82 is fixed to the return spring connection portion 80, and its outer end is fixed to a stationary pin 84 projecting vertically from the plate 5.

The return spring 82 acts on the finger gear 78 of the short month day forward gear 76 in the CCW direction to the pre-change date position from the position following the change of date (to which is hereinafter simply referred to as the "post-change position") after the short month advancement 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 forward advancement mark 76 in the CCW direction. The short month day advance mark 76 is rotatably indexed in the CCW direction and is held in position when the control pin 71a of the operating lever 71 adjoins the CCW end of the groove 78a of the gear wheel 78.

As shown in FIGS. 2 and 4, the intermediate date wheel 85 is arranged mobile in rotation with respect to the actuating lever 71 about a third axis C3 between the first axis C1 and the second axis C2. Intermediate date wheel 85 meshes with the 78 month short month advancement gear wheel 76.

The intermediate date wheel 85 is separated from the day forward gear 47 in the first position where the actuating lever 71 is inclined in the CW direction about the second axis C2. In addition, the date intermediate wheel 85 is engaged with the forward gear 47 in the second position where the actuating lever 71 is inclined in the CCW direction about the second axis C2. (Operation) [0088] In what follows, the operation of the calendar mechanism 100 described will be described, and in particular how the calendar mechanism 100 changes 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 fig. 9, the arrow in solid line indicates the direction of transmission of the energy.

Figs. 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 diagrams are given sequentially in the order of fig. 10-15. As regards the reference numbers of the components of the calendar mechanism 100 described below, the drawings refer to them as appropriate.

First, the operation of the calendar mechanism 100 will be described until the first day of the next month which is reached from the last day of a short month. In the following, by way of example, the operation of calendar mechanism 100 is described 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 long month. 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 an exception.

As illustrated in FIG. 7, the inscription of days 21 of "30" indicating the thirtieth day is displayed through the date window 11a. In addition, the letters of the month 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 determining 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 driving wheel 43 of the date indicator main control mechanism 40 via the wheel consisting of the hour wheel 16, the intermediate wheel 17, etc. (see Fig. 9). Therefore, the date indicator driving wheel 43 of the date indicator main control mechanism 40 rotates in the CW direction about the first axis C1 at a speed of a full rotation per day.

In the state in which the regulation pin 51 adjoins the end of the groove 43a, the actuating cam 50 rotates in the CW direction with the date indicator driving wheel 43. Therefore, the röchet 47 and the control cam 45 of the date indicator main control mechanism 40 turn in the CW direction about the first axis C1 at a speed of one rotation per day synchronously with the driving wheel of date indicator 43 and the actuating cam 50.

In addition, 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 advance determining lever 73 of the operating lever 71 is brought into sliding contact with the zone of the control cam 45 other than the determining portion of the control lever. 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 forward gear 47.

Then, when the forward gear 47, the control cam 45, the date indicator driving wheel 43, and the actuating cam 50 still rotate in the CW direction with the passing time, the distal end 73a of the day advance determining lever 73 reaches the day advance determination portion 46 of the control cam 45.

Then, as shown in FIG. 8, when 23 hours 55 minutes are reached, the distal end 73a of the day advance determination lever 73 enters the day advance determination portion 46 of the control cam 45 due to the force of compression of the operating lever member spring 72. In addition, the distal end 74a of the thirtieth-day determination lever 74 penetrates inside the thirtieth-day determination portion 29 and follows it. In addition, the distal end 75a of the short month determination lever 75 enters the notch 34b of the month cam 33 and follows it. 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 about the second axis C2, to the second position where it is inclined in the CCW direction around the second axis C2. The date intermediate wheel 85 moves with the rotation of the operating lever 71, and engages with the forward gear 47.

Furthermore, the second projection 53b of the actuating cam lever 52 reaches the compression surface 50b via 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 pressing surface 50b of the actuating cam 50 due to the compressive force of the actuating cam lever spring. 54. As a result, the forward feed nose 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 greater speed than the of the indicator wheel of date indicator 43.

In addition, with the energy transmitted by the forward gear 47, the intermediate date wheel 85 rotates at a high speed in the CCW direction about the third axis C3, and the gear wheel 78 of the röchet a short month day advancement 76, engaged with the intermediate date wheel 85, rotates at a high speed in the CW direction against the compression force of the return spring 82.

[0102] Then, as shown in FIG. 11, the short month day forward advancement pin 79b of the short month advancement pin 76 rotates at high speed in the CW direction about the second axis C2, and bears against the teeth 22 of the indicator 20. The short month day advance finger 79b of the short month advancement mark 76 acts in compression on the teeth 22 of the date indicator 20. The date indicator 20 is disengaged from the date jumper 25, and rotated in the CW direction around the center axis O.

In addition, with the rotation of the date indicator 20, the thirtieth calendar determination portion 29 moves in the CW direction. At this time, the distal end 74a of the thirtieth-day determination lever 74, which has been positioned inside the thirtieth-day determination part 29, moves along the thirtieth-day determination part. 29, and tends to exit the determination portion of thirtieth day 29. In addition, the operating lever 71 rotates in the CW direction about the second axis C2.

[0104] Then, as shown in FIG. 12, the date indicator 20 is again engaged with the date jumper 25, and rotates a notch in the CW direction about the center axis O. The date marking 21 displayed in the window date of date 11 a is changed from "30" to "31." [0105] In addition, the distal end 74a of the thirtieth calendar determination lever 74 leaves the thirtieth day determination portion 29 while being in sliding contact. with this one. Consequently, the operating lever 71 rotates in the CW direction about the second axis C2 from the second position where it is inclined in the CCW direction about the second axis C2 to the first position where it is inclined in the CW direction around the second axis C2. second axis C2. Therefore, the date intermediate wheel 85 is separated from the daylight forward gear 47. In addition, with respect to the short month day forward gear 76, the transmission of energy to the latter from the gear day progress 47 via the intermediate date wheel 85 is now released.

In this position, the short month day advance signal 76 is compressed from the postchanging position to the pre-change position by the return spring 82. Thus, when the transmission of energy since the day forward gear 47 is released, the short month day forward gear 76 is rotated at a high speed in the CCW direction about the second axis by the compression force of the return spring 82. therefore, the short month day advance finger 79b instantly returns to the pre-change position from the post-change position. The short month day advancement mark 76 is resiliently held by the elastic support 79c so that it can be moved inward radially. Therefore, when it returns to the pre-change position from the post-change position, the short month advancement finger 79b moves inward radially even when it bears against teeth 22 of the date indicator 20. Therefore, a commitment between the short month advancement finger 79b and the teeth 22 is avoided, so that the date indicator 20 does not rotate in reverse in the CCW sense.

[0107] Then, as shown in FIG. 13, the forward feed nose 47, the control cam 45, and the actuating cam 50 of the date indicator main control mechanism 40 rotate at a high speed in the CW direction about the first axis C1. The finger portion 47c of the forward gear 47 bears against the teeth 22 of the date indicator 20 and acts in compression thereon.

[0108] Then, as shown in FIG. 14, the date indicator 20 is disengaged from the date jumper 25, and rotates in the CW direction about the center axis O. In addition, with the rotation of the date indicator 20, the advancing part of month 26 acts on the tooth 28a of an intermediate wheel months 28 provided inside the date indicator 20. Therefore, the intermediate wheel months 28 rotates in the CW direction. In addition, the month wheel 30 in engagement with the intermediate wheel 28 is disengaged from the month jumper 35, and rotates in the CCW direction. As a result, a month display plate 15 displaying month letters 15a rotates synchronously with the month wheel 30.

[0109] Then, as shown in FIG. 15, the date indicator 20 is made to engage again with the date jumper 25, and still turns a notch in the CW direction about the center axis O. Therefore, the inscription of date 21 displayed through the date window 11a is changed from "31" to "1." [0110] In addition, the wheel of the month 30 is made to engage again with the jumper of month 35, and turns of a CCW-directional notch about the center axis O. The month display plate 15 displaying the month letters 15a rotates one notch in the CCW direction about the center axis O synchronously 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.

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, carried out by the calendar mechanism 100, is over.

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

[0113] FIG. 17 is a plan view illustrating the state around 24 o'clock on the thirtieth day for the change of day in a long month, with the change of date done halfway.

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

In what follows we will give, as an example, the operating mode of the calendar mechanism 100 when a transition is made since the thirtieth day of May, which is a long month, the first day of June (1 June), which is a short month, on the thirty-first day of May. For all that concerns any operation that is the same as that described above of the 100 calendar mechanism for a transition since the last day of April, which is a short month, the first day of May, which is a long month, we will refer to the above without providing a further detailed description.

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

Moreover, since the date indicator 20 displays the thirtieth day, the distal end 74a of the thirtieth calendar determination lever 74 is arranged to be in a position corresponding to the thirtieth day determination portion 29 of the date indicator 20.

In addition, the distal end 75a of the short month determination lever 75 is arranged to be in a position corresponding to the protrusion 34a of May, which is a long month.

When the time elapses, the forward gear 47, the control cam 45, the date indicator gear wheel 43, and the actuating cam 50 rotate in the CW direction. The distal end 73a of the day advance determination lever 73 reaches the day advance determining portion 46 of the control cam 45.

Then, as shown in FIG. 16, when reaching 23 hours 55 minutes on the thirtieth day, the distal end 73a of the day advance determination lever 73 tends to enter the day advance determining portion 46 of the control cam 45 due to the compressive force exerted by the operating lever element spring 72.

In this position, the distal end 75a of the short month determination 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 bears against the projection 34a, and its rotation in the CCW direction (i.e., its movement from the first position to the second position) is indexed. The intermediate date wheel 85 is maintained in a state in which it remains spaced from the day forward gear 47. Thus, the energy transmission of the forward gear 47 to the intermediate date wheel 85 and the 78 month short day forward gear pin 78 is cut, and they are held in position without turning.

Then, when reached 24 hours (midnight) on the thirtieth day, 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 in this way, the forward feed beam 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 driving wheel 43.

[0123] Then, as shown in FIG. 17, the forward feed nose 47, the control cam 45, and the actuating cam 50 of the date indicator main control mechanism 40 rotate in CW direction at high speed about the first axis C1. The finger portion 47c of the forward gear 47 bears on the teeth 22 of the date indicator 20 and exerts a compression on the latter. The date indicator 20 is disengaged from the date jumper 25, and rotates in the CW direction about 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 advance determining portion 46.

[0124] Then, as shown in FIG. 18, the date indicator 20 is again engaged with the date jumper 25, and turns a notch in the CW direction about the axis of center O. The date of inscription 21 displayed in the window of date 11a is changed from "30" to "31." [0125] A similar operation is also performed during the passage of May 31, which is the last day of a long month, June 1, which is the first day of a short month. In other words, when it reaches 24 hours 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 spring. actuating cam lever 54. The forward feed nose 47, the control cam 45, and the actuating cam 50 of the date indicator main control mechanism 40 rotate at high speed in the CW direction around of the first axis C1. The finger 47c of the forward gear 47 bears against the teeth 22 of the date indicator 20 and exerts a compressive force on the latter. As a result, the date indicator 20 is disengaged from the date jumper 25, and rotates in CW direction about the center axis O.

In addition, with the rotation of the date indicator 20, the month advancement portion 26 acts on the tooth 28a of the intermediate wheel 28 months arranged inward of the date indicator 20 As a result, the intermediate wheel of the months 28 rotates in the CW direction. In addition, the 30-month wheel engaged with the intermediate wheel 28 is released from the month jumper 35 and rotates in the CCW direction. As a result, the month display plate 15 displaying the month 15a letters rotates in the CCW direction synchronously with the 30 month wheel.

Then, the date indicator 20 is engaged again with the date jumper 25, and turns a notch in the CW direction about the center axis O. Therefore, the date inscription 21 displayed in the date window 11 a passes from "31" to "1." [0128] In addition, the wheel of the month 30 comes again to engage with the saltire of the months, and turns of a in the CCW direction around the center axis O. Therefore, the month letters 15a displayed in the month window 11b are changed from "MAY", indicating the month of May, to "JUN" indicating the month of June.

Thus, the transition from the thirtieth day of May, which is a long month, to June 1st, which is the first day of a short month, is completely carried out thanks to the calendar mechanism 100 via the thirty-one - the first day of May.

According to the present embodiment, it is possible to operate the calendar mechanism 100 by means of the operating lever 71, so that, compared with the prior art technique in which four levers are provided, a reduction in the number of components and a structural simplification is achieved.

Furthermore, the actuating lever 71 is provided with the thirty-day determination lever 74 and the short month determination lever 75, so that, only by raising the actuating lever 71, it is possible arranging the thirtieth day determination lever 74 and the short month determining lever 75 into predetermined positions. In other words, there is no need to perform individual positioning of the thirtieth calendar determination lever 74 and the short month determination lever 75, so that the production of such a mechanism is facilitated.

In addition, the actuating lever 71 rotates from the first position to the second position when the thirtieth day determination lever 74 follows the thirtieth day determination portion 29, and the short month determination lever 75 follows. the notch 34b of the month cam 33; and the intermediate date wheel 85 engages with the day advance pin 47 when in the second position, so that the energy of the daylight forward gear 47 can be transmitted to the Short month day advance signal 76 by the intermediate date wheel 85. Thus, it is possible to rotate the date indicator 20 on the last day of a short month by means of the forward speed signal. 47 day and 76 month short day progress log to accurately perform the date change.

In addition, the actuating lever 71 is arranged such that the day advance determining lever 73 is in sliding contact with the outer peripheral surface of the control cam 45, so that It is possible to generate the tracking of the thirtieth day determination part 29 by thirtieth calendar determination lever 74 without putting it in contact with the date indicator 20. Therefore, it is possible to suppress the generation of a load on the date indicator 20 from the operating lever 71, so that it is possible to prevent a deflection of the date indicator 20 and display a day in a predetermined position.

In addition, the short month calendar indicator control mechanism 70 is equipped with the return spring 82 acting in compression on the short month day advance signal 76 from the date postchange position to the pre-change date position, so that the short month forward advancement mark 76 can be returned to the pre-forward position after the date indicator 20 is rotated within a short month. Therefore, it is possible to accurately perform a date change by advancing one day also during the next short month.

In addition, the resilient support 79c resiliently supporting the short month advancement finger 79 is provided to allow radially inward movement of the short month advancement mark 76 , so that when the short month advancement finger 79b is returned to the pre-change date position to the post-change date position, it is possible to prevent the date indicator 20 to turn. Thus, it is possible to rotate the date indicator through the day advance mark 47 and the short month day advance mark 76 at the end of a short month to make a date change. precisely.

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 piece of furniture. watches 1 which are better reliability and low cost. (Variants of the previous embodiment) FIG. 19 is a plan view of a movement equipped with a calendar mechanism according to a variant, and FIG. 20 is a sectional view taken along line C-C of FIG. 19.

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

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

In this way, as shown in FIGS. 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 control cam and the day progress determination lever. In the following, a detailed description of the components which are the same as those of the embodiment described above will therefore not be repeated. (Main date indicator control mechanism) [0141] As shown in FIGS. 19 and 20, the main date indicator control mechanism 40 is equipped with the date pin 41, the date indicator driving wheel 43, the actuating cam 50, the actuating cam lever. 52, and day advance mark 47.

The date pin 41 is of a tubular configuration, and is inserted without clamping on the shaft 6 to be movable in rotation about the first axis C1. At the intermediate portion in the axial direction of the date pin 41 is a support plate 41a. The support plate 41a is arranged at the rear of the movement 10 with respect to the date indicator driving wheel 43. The support plate 41a is configured in the form of a circle in the axial direction, and is of a larger diameter. small as the date indicator driving wheel 43.

The forward feed pin 47 is inserted and fixed on the rear end of the date pin 41. The forward feed pin 47a of the forward feed nose 47 is arranged in a state in which it is in contact with the support plate 41a.

The short month calendar indicator control mechanism 70 is equipped with the operating lever 71.

The actuating lever 71 is equipped with the regulating pin 71a, the thirtieth calendar determination lever 74, and the short month determination lever 75. The thirtieth-day determination lever 74 and the determination lever Short months 75 are arranged integrally with one another.

The end 74a of the thirtieth calendar determination lever 74 has a shape curved towards the inner peripheral surface 20a of the date indicator 20. The end 74a of the thirtieth calendar determination lever 74 is kept in contact with the inner peripheral surface 20a of the date indicator 20 by the compressive force of the spring of the actuating lever 72.

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

[0148] The short month day advance finger 79b extends along the radial direction. The short month advancement finger 79b protrudes outwardly 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 calendar determination lever 74 is in sliding contact with the zone of the inner peripheral surface 20a of the date indicator 20 other than the thirtieth calendar determination portion 29, the lever actuator 71 is arranged to be in the first position where it is inclined in the CW direction about the second axis C2. When the distal end 74a of the thirtieth-day determination lever 74 has penetrated inside the thirtieth-day determination part 29 of the date indicator 20, and is in sliding contact with it, the lever actuator 71 is arranged to be in the second position where it is even more inclined in the CCW direction about the second axis C2 than when it is in the first position. (Operation) [0150] In the following, 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 when switching 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 in a short month.

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

Figs. 23 to 27 are plan views illustrating the state around midnight on the last day of a short month for a date change, the patterns being ordered in a sequence following the passage of time.

First of all, the operation of the calendar mechanism 100 will be described during the transition from the last day of a short month to the first day of the following month; for 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 1st).

As shown in FIG. 19, the date marking 21 of the "29" indicating the 29th day is exposed and displayed in the date window 11a. The month 15a letter of "APR" indicating April, which is a short month, is exposed and displayed in the month window 11b.

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.

[0157] Immediately before 24 hours of the 29th day, which is the day before the last day for the change of calendar of a short month, the daylight forwarding pin 47 and the actuating cam 50 of the main control mechanism Date indicator 40 rotates in the CW direction at a speed greater than the date indicator driving wheel 43. The finger 47c of the forward feed nose 47 bears against the teeth 22 of the indicator of date 20 and acts on them.

[0158] Then, as shown in FIG. 21, at 0 o'clock on the thirtieth day, which is the last day for the change of date during a short month, the date indicator 20 rotates a notch, and the date marking 21 exposed through the date window 11a is changed from "29" to "30." [0159] Then, the distal end 74a of the thirtieth calendar determination lever 74 reaches the determination portion of thirtieth day 29 of the date indicator 20 and, at the same time, penetrates inside the thirtieth day determination portion 29 of the date indicator 20 due to the compressive force exerted by the spring of the actuating lever 72. In addition, the The distal end 75a of the short month determination lever 75 enters the notch 34b of the month cam 33 and follows it. 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 date intermediate wheel 85 moves together with the rotation of the actuating lever 71, and engages with the forward gear 47.

The control pin 51 of the actuating cam 50 moves in the groove 43a by means of the high speed movement of the forward gear 47 and the actuating cam 50, and when, after flow 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 drive wheel. date indicator 43 rotating at a fixed speed. Thus, the actuating cam 50 and the day feed nose 47 are idle without turning until 5 hours 55 minutes on the thirtieth day.

[0161] Next, as shown in FIG. 22, when, for example, the hour of 5 hours 55 minutes is reached on the thirtieth day, the regulation pin 51 of the actuating cam 50 abuts against the end of the groove 43a of the driving wheel date indicator 43 in the CCW direction. As a result, the energy of the date indicator driving wheel 43, rotating in the CW direction at a fixed speed, is transmitted to the actuating cam 50 and the forward advancement pin 47 via the regulating pin 51. The actuating cam 50 and the forward gear 47 rotate synchronously with the date indicator driving wheel 43. In addition, the energy is transmitted from the forward gear 47 to the intermediate date wheel 85 engaged with the day forward gear 47, and the date intermediate wheel 85 rotates in the CCW direction at a predetermined speed about a third axis C3.

As shown in FIG. 23, as time elapses, the finger wheel gear 78 of the short month advancement pin 76, engaged with the date intermediate wheel 85 rotates in the CW direction at a predetermined speed against the compression force of the return spring 82.

[0163] Then, as shown in FIG. 24, when it reaches 24 hours on the thirtieth day, the short month advancement finger 79b of the short month advancement mark 76 bears against the teeth 22 of the date indicator 20. And, the short month day advancement finger 79b of the short month advancement marker 76 comes to act on the teeth 22 of the date indicator 20.

[0164] Then, as shown in FIG. 25, the date indicator 20 is disengaged from the date jumper 25, and rotates in the CW direction about the center axis O. In addition, with the rotation of the date indicator 20, the determination portion of thirtieth day 29 moves in the CW direction. At this time, the distal end 74a of the thirtieth-day determination lever 74, which has been positioned inside the thirtieth-day determination part 29, tends to leave the thirtieth-day determination part 29. In addition, 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 is again engaged with the date jumper 25, and rotates one notch in the CW direction about the center axis O. The date marking 21 displayed in the window date of date 11a is changed from "30" to "31." [0166] The operating 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 towards the first position where it is inclined in the CW direction about the second axis C2. Therefore, the date intermediate wheel 85 is spaced from the day advance pin 47.

[0167] In addition, the transmission of power to the short month forward gear 76 from the forward gear 47 via the intermediate date wheel 85 is released. The short month day forwarding pin 76 rotates at a high speed in the CCW direction about the second axis due to the compression force exerted by the return spring 82, and is instantly returned to the pre-change position of date from the post-change date position.

The second protrusion 53b of the actuating cam lever 52 reaches the compression surface 50b and acts on it because of the rotation of the actuating cam 50. Therefore, the advancement mark of day 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 driving wheel 43. The short month advancement finger 79b of the short month day advance signal 79b acts on the teeth 22 of the date indicator 20. The date indicator 20 is disengaged from the date jumper 25, and rotates in the CW direction around the center axis O.

And, as shown in FIG. 27, the date indicator 20 is again engaged with the date jumper 25, and turns a notch in the CW direction about the center axis O. The date marking 21 displayed in the date window 11 a is changed from "31" to "1." [0170] In addition, due to the rotation of the date indicator 20, the advancing part of month 26 acts on the tooth 28a of the intermediate wheel months months 28 arranged inside the date indicator 20. Consequently, 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 from 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, as an example, the operating mode of the calendar mechanism 100 for a transition of the thirtieth day of May, which is a long month, the first day of June, which is the first day of a long month, via the thirty-first day, which is the last day of May. For similar date-change operations to those described in the calendar mechanism 100 of the embodiment described above, and that of a change in 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.

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 projection 34a, and the actuating lever 71 is adjusted in its CCW rotation (i.e., the movement of the first position to the second position). The intermediate date wheel 85 is maintained in a state in which it is spaced from the day advance gear 47. Thus, the energy transmission of the daylight forward gear 47 to the date intermediate wheel 85 and the wheel Finger tooth 78 of the short month day advance connector 76 is interrupted, and these are held in position without being rotated.

Then, when the predetermined time of the thirtieth day (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 forward feed pin 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 driving wheel 43. As a result, the date indicator 20 rotates a notch in the CW direction about the center axis O, and the date registration 21 displayed in the date window 11a is changed from "30" to "31." [0176] When a date change is made on May 31st, which is the last day of a long month, to move to June 1st, which is the first jo For a short month, a similar operation is performed. In other words, when reaching 24 hours on May 31, the second projection 53b of the actuating cam lever 52 acts on the pressing surface 50b of the actuating cam 50 due to the force of compression exerted by the actuating cam lever spring 54. Accordingly, the date indicator 20 rotates in the CW direction about the center axis O of a notch, and the date marking 21 displayed in the date window 11a changes from "31" to "1".

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

In this way, the transition is completely performed by the calendar mechanism 100 to move from the thirtieth day of May, which is a long month, to June 1, which is the first day of a short month, 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. In addition, there is no need to provide a control cam, so that it is possible to provide a calendar mechanism 100 for further reduction in size and thickness.

The technical scope of this invention is not restricted to that of the above embodiment 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.

The control cam 45 according to the above embodiment is formed so that the lateral surface 46a in the CW direction of the day advance determination portion 46 extends in the radial direction (see FIG. Fig. 5).

On the other hand, as for the control cam 45 shown in FIG. 29, the CW side surface 46a of the day advance determination portion 46 can be CW-inclined from the inside out in the radial direction so that the opening of the portion of day advance determination 46 can be expanded.

According to this architecture, the distal end 73a of the day advance determination lever 73 enters the day advance determining portion 46 at a lower speed than in the above embodiment while 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 forward gear 47 and the intermediate date wheel 85 meshes with each other at a lower speed than in the embodiment above. Therefore, it is possible to eliminate the wear of the teeth of the forward gear 47 and the intermediate date wheel 85, so that a longer life calendar mechanism 100 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. 30.

According to this embodiment, the display plate 15 months is arranged on the front of the movement 10 relative to the dial 11, and a month is displayed by exposing the letters 15a months of the display plate months 15 through the window of months 11b (see Figures 1 and 3).

[0187] On the other hand, as shown in FIGS. 30 and 31, a hand of the months 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 represented on the dial 11 by the hand of the months 18.

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

Claims (6)

In addition to this, it is possible to replace the components of the embodiment described above with known components if necessary without departing from the scope of the spirit of the present invention. claims 1. Calendar mechanism comprising: an indicator of the months (30) rotating per year; a calendar indicator (20) rotating one month and having a thirtieth-day determining portion (29) located at a predetermined position at its periphery; a date indicator main control mechanism (40) rotating daily and rotating the date indicator (20); and a short month indicator control mechanism (70) rotating the date indicator (20) at the end of a short month having 30 days or less, wherein the month indicator (30) has a a month cam (33) having, on its outer peripheral surface, a short month determining portion corresponding to the short month; the main date indicator control mechanism (40) has an actuating cam (50) superimposed on and rotatably arranged with respect to a date indicator drive wheel (43), rotated by at a fixed speed, and which is configured to rotate per day, and a forward feedmark (47) rotating synchronously 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 determination lever (74) capable of following the thirtieth day determination portion (29), and a month determination lever (74). short (75) capable of following the short month determining portion, having an operating lever (71) rotating about a predetermined axis, a short month advancing mark (76) rotating the indicator date calendar (20) at the end of a short month, and an intermediate date wheel (85) arranged to be rotatable with respect to the actuating lever (71) when engaged with the ratchet short month day advance (76); the actuating lever (71) moving between a first position and a second position when the thirtieth calendar determination lever (74) follows the thirtieth day determination part (29), and the month determination lever short (74) follows the short month determination portion; and the intermediate date wheel (85) being spaced from the forward gear (47) when the actuating lever (71) is in the first position, and engaging with the forward gear ( 47) when the operating lever (71) is in the second position. The calendar mechanism according to claim 1, wherein the main date indicator control mechanism (40) is equipped with a control cam (45) rotating synchronously with the actuating cam (50) and having a day advance determining portion (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 progress determination lever (73) comes into sliding contact with the day advance determination portion (46), the thirtieth calendar determination lever (74) follows the thirtieth day determination portion (29), and the month determination lever (74). short (75) follows the short month determination portion. The calendar mechanism according to claim 1 or 2, wherein the short month calendar indicator control mechanism (70) is equipped with a compression means for applying a restoring force to the forward gear. a short month day (76) for bringing it from a position prior to the date change, before rotating the date indicator (20) to a position following the change of date after rotating the indicator of date (20). The calendar mechanism according to claim 3, wherein the short month day advance pin (76) is equipped with a short month day advance finger (79b) acting on a flag tooth. date calendar (20) for rotating the date indicator (20); and wherein an elastic support portion resiliently supporting the short month advancement finger (79b) is arranged to be movable radially inwardly of the short month advancement mark (76) when the short month advancement finger (79b) moves from the position corresponding to that after the date change to the position corresponding to the one preceding the date change to contact the tooth. 5. A movement equipped with a calendar mechanism according to claim 4. 6. Timepiece equipped with a movement according to claim 5.