JP2011209071A - Big date display mechanism and watch equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a big date display mechanism and a watch equipped with the same, displaying date and time in an appropriate position of a date window under such a condition that first and second sun wheels are arranged concentrically, and having a small hand to be displayed.SOLUTION: A big date display mechanism 1 of a watch has: a first sun wheel 30 which is rotated at a constant angle each day; a second sun wheel 50 which is concentric with the first sun wheel and is rotated each time a date/time at tens digit changes; and a second sun wheel feeding wheel 70 which transmits rotation of the first sun wheel to the second sun wheel. The second sun wheel feeding wheel 70 concentrically has, as one body, a driven gear part 72 and a driving gear part 75 which are arranged between the first and second sun wheels and rotated in one direction. The first sun wheel has a ratchet part 40 equipped with a plurality of claws capable of engaging with the teeth of the driven gear part. The second sun wheel has a sector gear part 56 equipped with a plurality of teeth capable of engaging with the teeth of the driving gear part. It further has a return spring 65 which returns the second sun wheel to an original rotational position by reversal rotation when the second sun wheel is rotated in a certain range of angle.

Description

  The present invention relates to a big date display mechanism and a timepiece having the same.

  A big date display mechanism is known in which a 10th digit and a 1st digit of a date are displayed on separate date wheels in order to display the date large in a watch.

  One conventional typical big date display mechanism 101 has a structure as shown in FIGS. 10A and 10B, for example (Patent Document 1).

  In other words, the conventional big date display mechanism 101 includes a substantially annular first date indicator 110 that displays the date of the 1st place and a generally sector-shaped second date indicator 120 that displays the date of the 10th place. The first date wheel 110 includes four types of cam surfaces 111 (that is, cam surfaces 111A, 111B, 111C, and 111D) on the outer peripheral surface side of the inner peripheral wall. A second date indicator feeding mechanism 130 that couples the first date indicator 110 and the second date indicator 120 includes a short lever portion 131 that functions as a cam follower and a long lever portion 132 that is longer than the short lever portion 131, A fan-shaped second date indicator driving gear 133 is provided at the tip of the lever portion 132. The tip 134 of the short lever 131 which is a cam follower is elastically pressed against the cam surface 111. The first date wheel 110 is drastically controlled by the date jumper 140 and rotated by the date indicator 151 of the date indicator driving wheel 150 or the like.

  In this conventional big date display mechanism 101, the first date indicator 101 is rotated by one step in the C1 direction each time the date passes, and accordingly, the date display window D1 is displayed through the date column D1 at the 1st place. The numerical value of the first date character 115 displayed is increased by one. When the date of the 1st place is changed from “9” to “0”, the cam surface 111 with which the short lever 131 comes into contact is raised one step, and accordingly, the short lever 131 and the long lever 132 are rotated in the P1 direction. As the P1 direction turns, the fan-shaped driven gear portion 121 of the second date indicator 120 meshed with the second date indicator driving gear 133 turns by one step in the C1 direction, and the date column at the 10th position of the date display window D is displayed. The numerical value of the second date character 125 displayed via D2 is increased by one. When the date returns from “31” to “1”, as the first date indicator 101 rotates in the C1 direction, the cam surface 111 with which the short lever 131 comes into contact returns from the cam surface 111D to the cam surface 111A. The short lever 131 and the long lever 132 are suddenly rotated in the P2 direction, and the second date indicator 120 meshed with the second date indicator driving gear 133 along with the P2 direction rotation is the C2 direction of the sector driven gear portion 121. It suddenly turns and returns.

  In the case of such a conventional big date display mechanism 101, the position of the second date indicator 120 is defined by the second date indicator feed mechanism 130.

  That is, the rotational position of the second date indicator 120 is uncertain as much as the backlash of the engagement between the second date indicator driving gear 133 of the second date indicator feed mechanism 130 and the fan-shaped driven gear portion 121 of the second date indicator 120. Remains. Here, the second date indicator feeding mechanism 130 is not only rotated in the P1 direction, but also needs to be suddenly rotated in the P2 direction when the display changes from the “31” day to the “1” day. Therefore, the second date indicator driving gear 133 and the fan-shaped driven gear 121 cannot be controlled by a jumper.

In addition, the displacement is increased in accordance with the lever ratio between the long lever 132 and the short lever 131 (typically about 2.5), and the fan-shaped driven gear portion 121 and the second date character portion 125 of the second date indicator 120 are used. The displacement is enlarged according to the lever ratio (which is also typically about 2.5). Therefore, if there is a variation in the component dimensions, the variation is increased (for example, about 6 (= 2.5 ² ) times) There is a possibility that the positional deviation of the date display character of the second date indicator with respect to the date window becomes large.

  On the other hand, as shown in FIGS. 11 (a) and 11 (b), the annular first date wheel 210 and the disk-shaped second date wheel 220 are concentric and the first date wheel 210 is second. There is also known a big date display mechanism 201 in which a concentric second date indicator 220 is rotated via an intermediate wheel or a second date indicator indicator 231 that functions as a date indicator feeding mechanism 230 (Patent Document 2).

  In the big date display mechanism 201, the first date indicator 210 is dramatically controlled by the first date jumper 240 in the first date gear portion 211, and the second date indicator 220 is changed by the second date jumper 221 in the second date gear portion 221. It is a great success at 260. The first date wheel 210 is rotated in the C1 direction by the date driving claw 251 of the date driving wheel 250. The first date indicator 210 is discretely provided with feed teeth 213 that engage with the teeth 232 of the second date indicator feed wheel 231 and rotate the feed wheel 231 in the E1 direction. Accordingly, the tooth 222 of the second date indicator wheel portion 221 of the second date indicator 220 is engaged with the tooth 232 of the second date indicator feed wheel 231 and is engaged with the second date indicator feed wheel 231 to rotate in the C2 direction. Is done.

  In this conventional big date display mechanism 201, the first date indicator 201 is rotated by one step in the C1 direction each time the date passes, and accordingly, the date column D1 at the 1st place of the date display window D is used. The numerical value of the first date letter 215 displayed is increased by one. When the one-digit date changes from “9” to “0”, the feed dog 213 of the first date indicator 210 is engaged with the teeth 232 of the second date indicator feed 231 and the second date indicator feed 231. Is rotated by one step in the E1 direction, and the second date indicator 231 is rotated by one step in the C2 direction in accordance with the rotation of the second date indicator feeding wheel 231 in the E1 direction. The numerical value of the second date character 225 displayed through the tenth place date column D2 is increased by one. The same applies when the date returns from “31” to “01”.

  For example, the second date indicator 220 is cyclically provided with a number of ten places for three months.

  In such a conventional big date display mechanism 201, unlike the big date display mechanism 201 shown in FIG. 10, the first and second date jumpers to which the rotations of both the first and second date indicator 210, 220 correspond. 240, 260 can be overwhelmed and the indication of the date dials 210, 220 can be properly positioned.

  However, in the conventional big date display mechanism 201 of this type, both the first and second date dials 210 and 220 are rotated around the central axis C, so that practically the entire area at the dial is the entire rotation plate. Therefore, there is no room for performing another display (typically, a small needle display) in a part of the area, and there is a disadvantage that it is difficult to avoid that the display is largely restricted.

  Further, a second date indicator whose diameter is about half that of the first date indicator is arranged so as to be rotatable around a position greatly deviated from the center of rotation of the watch, and a claw provided with four claws concentrically with the second date indicator A big date display mechanism has also been proposed in which a car is rotated by claws arranged at intervals in the circumferential direction of the first date indicator (Patent Document 3).

  In the proposed big date display mechanism, since the second date indicator having a diameter of about half is eccentrically arranged, an area that is not scanned by the first and second date indicator remains. Can be displayed.

  However, in this proposed big date display mechanism, there are only four claws of the second date wheel at 90 degree intervals, so in order to reliably jump the claw wheel with the jumper of the jumper, Since it is necessary to increase the holding force of the jumper spring and to rotate the claw wheel against this strong spring load, it is difficult to avoid an increase in loss of driving energy. On the other hand, when the holding force of the jumper spring is small, it is difficult to avoid the positioning of the second date indicator becoming unstable or insufficient.

JP2007-218856 JP 2005-214837 A Japanese Patent No. 4307613

  The present invention has been made in view of the above points, and its object is to display the date at an appropriate position on the date window in a state where the first and second date indicators are concentrically arranged, and It is an object of the present invention to provide a big date display mechanism capable of displaying a small hand and a timepiece having the same.

  In order to achieve the above object, the big date display mechanism of the present invention is a first date indicator that is rotated by a constant angle every day, and a first date indicator that is rotated every time the tens place date is concentric with the first date indicator. A big date display mechanism having a second date indicator and a second date indicator feeding wheel that transmits the rotation of the first date indicator to the second date indicator. It is arranged in an annular region between the cars and is configured to rotate in one direction. The driven gear part and the driving gear part are integrally provided at different positions in the concentric and axial directions, and the first date indicator is the second date indicator. A plurality of claw wheels provided with a plurality of claw portions engageable with teeth of a driven gear portion of a feed wheel, and a plurality of second date wheels that can be engaged with teeth of a drive gear portion of a second date wheel feed wheel When the second date indicator is rotated by the angular range of the sector gear portion, the second date indicator is rotated in the reverse direction to return to the original rotational position. It is returned further comprising a spring.

  In the big date display mechanism of the present invention, “the first date indicator that is rotated by a fixed angle every day, the second date indicator that is rotated concentrically with the first date indicator every time the tens place changes, A second date indicator feed wheel that transmits the rotation of the day indicator to the second date indicator, and the second date indicator feed wheel is arranged in an annular region between the first and second date indicators and is unidirectional Therefore, the rotation of the first date indicator can be transmitted to the second date indicator as it is without being excessively enlarged. In the big date display mechanism of the present invention, the return spring returns to the original rotation position by rotating the second date indicator in the reverse direction when the second date indicator is rotated by the angular range of the sector gear portion. Therefore, the first and second date wheels are always subjected to a load in one direction, so that the possibility of positional displacement due to backlash can be minimized. Therefore, the date can be reliably displayed at an appropriate position of the date window. Further, in this big date display mechanism, since the second date indicator is reciprocated within a limited angle range without making one rotation, it is possible to display a small hand.

  The big date display mechanism of the present invention typically includes a second date indicator jumper that controls the second date indicator feed.

  In that case, the second date indicator feed wheel can be securely held at an appropriate rotational position, the second date indicator can be securely held at an appropriate rotational position, and the tens place date can be set to an appropriate position on the date window. Can be displayed. Here, since the second date indicator feed wheel transmits the rotation of the first date indicator to the concentric second date indicator, the gear (driven gear portion) of the second date indicator feed wheel can have a sufficient number of teeth. Unlike the case of the conventionally proposed big date display mechanism in which the second-day wheel-feeder jumper jumps a four-toothed cross-shaped car with a jumper, a driven gear portion comprising a gear with a sufficient number of teeth is provided. It can be dramatically controlled with a relatively small holding force (jumper spring force), and the load on transmission of rotation from the first date indicator to the second date indicator can be minimized.

  In the big date display mechanism of the present invention, typically, when the second date indicator is rotated in the return direction by the return spring, the rotation in the return direction of the second date indicator is regulated by contacting the stopper. Configured.

  In that case, the rotation of the second date indicator can be reliably regulated by the stopper. Here, the stopper typically consists of a locking portion such as a locking projection fixed to a stationary support such as a ground plate, and the wall surface locked by the stopper of the second date indicator is: For example, it consists of a side wall of an arcuate recess. However, as long as desired locking can be performed, the structure and shape may be any.

  In the big date display mechanism of the present invention, typically, the drive gear portion of the second date indicator feed wheel is provided with a missing tooth portion that lacks teeth in a part of its circumferential direction, and the missing tooth portion is the second date. When facing the sector gear portion of the car, the sector gear portion is configured to be rotatable in a non-engaged state with respect to the drive gear portion of the second date indicator feed wheel.

  In that case, the second date indicator can be returned to the initial position by the return spring. This initial position is typically a position where the second date indicator is locked to the stopper as described above.

  In the big date display mechanism of the present invention, the claw wheel portion of the first date indicator may or may not include a claw portion for idle feeding that does not involve rotation of the second date indicator.

  In the former case, i.e., when the claw wheel portion of the 1st date indicator has a claw portion for idle feeding that does not involve the rotation of the 2nd date indicator, the number is desirable for smooth rotation transmission and appropriate jumping by jumpers. It is easy to provide the desired relative rotation to the first and second date dials by providing the teeth of the second gear to the driven gear portion.

  In this case, the big date display mechanism of the present invention is typically configured such that the second date indicator feed wheel is rotated once while the first date indicator is rotated once. In that case, for example, the claw wheel portion of the 1st date indicator is provided with 4 idle feed claw portions, the driven gear portion of the 2nd date indicator feed wheel is provided with 8 tooth portions, and the 2nd date indicator feed wheel The drive gear portion includes three tooth portions and five missing tooth portions. When the driven gear portion includes five or more tooth portions having a desired number of teeth N, the drive gear portion of the second date indicator feed wheel includes three tooth portions and (N-3) missing tooth portions. The number N of teeth is preferably sufficiently larger than four to facilitate smooth rotation transmission in a given space, and is preferably not excessively large from the viewpoint of ease of manufacture. Since the number of teeth (N-4) for feeding is 8 or less ((N-4) ≦ 8), N ≦ 12.

  The big date display mechanism of the present invention may be configured such that the second date indicator feed wheel is rotated a plurality of times while the first date indicator is rotated once.

  In that case, it is also possible to avoid idle feeding while ensuring smooth rotation transmission. This is suitable, for example, when the claw wheel portion of the 1st date indicator does not include the claw portion for idle feeding that does not involve rotation of the 2nd date indicator.

  In this case, for example, the driven gear portion of the second date indicator feed wheel includes eight tooth portions, and the drive gear portion of the second date indicator feed wheel includes three tooth portions and one missing tooth portion. Two sets are provided.

  The timepiece of the present invention includes the above-described big date display mechanism in order to achieve the above-described object.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory plan view of a big date display mechanism of a timepiece having a big date display mechanism according to a preferred embodiment of the present invention (when it is changed from 9th to 10th). FIGS. 2A and 2B show a date indicator of the big date display mechanism of FIG. 1, in which FIG. 1A is an explanatory plan view of a first date indicator, and FIG. FIGS. 1A and 1B show a second date indicator feeding wheel of the big date display mechanism of FIG. 1, wherein FIG. 1A is a perspective explanatory view seen from the driven claw wheel side, and FIG. 1B is a perspective explanatory view seen from the driving claw wheel side. Figure. FIG. 2 is a cross-sectional explanatory view of a timepiece having a big date display mechanism according to a preferred embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory plan view showing an appearance of a timepiece having a big date display mechanism according to a preferred embodiment of the present invention from the dial side. FIG. 12 is an explanatory plan view showing a state when the date changes from the 10th to the 11th in the big date display mechanism of FIG. 1. FIG. 3 is an explanatory plan view showing a state when the date changes from the 31st to the 1st in the big date display mechanism of FIG. 1. FIG. 3 is an explanatory plan view showing a state in which the date changes from one day to two days in the big date display mechanism of FIG. 1. The plane explanatory drawing similar to FIG. 1 about the big date display mechanism of the timepiece provided with the big date display mechanism of the modification of this invention. 1A and 1B show an example of a conventional big date display mechanism, where FIG. 1A is a plan view of the mechanism, and FIG. 2B is a plan view showing an overview of first and second date wheels used in the mechanism. Figure. The conventional big date display mechanism of another example is shown, (a) is a plane explanatory view of the mechanism, (b) is a plane explanatory view showing an outline of a second date indicator used in the mechanism. .

  A preferred embodiment of the present invention will be described based on a preferred embodiment shown in the accompanying drawings.

  A timepiece 2 having a big date display mechanism 1 according to a preferred embodiment of the present invention has an appearance as shown in FIG.

  The timepiece 2 has a chronograph in the form of a small hand rotated around positions Cs, Cm, and Ch eccentric from the center C, in addition to the second hand 11, the minute hand 12 and the hour hand 13, which are rotated around the central axis C. A second hand 14, a chronograph minute hand 15, and a chronograph hour hand 16 are provided. The needles 11, 12, 13, 14, 15, 16 may be partially or entirely differently displayed. For example, the hand 16 may be a 24-hour hand. In this example, the positions Cs, Cm, and Ch include a 3 o'clock position, a 9 o'clock position, and a 6 o'clock position, respectively. However, if desired, the position may be different.

  The timepiece 2 includes a so-called big date display mechanism 1. The date display window D of the dial plate 3 includes an area D1 for displaying the 1st place date and an area D2 for displaying the 10th place. The date of the 1st place by the first date indicator 30 is displayed in the area D1, and the date of the 10th place by the second date indicator 50 is displayed in the area D2.

  In the timepiece 2, as shown in the cross-sectional view of FIG. 4, the true 22 a of the second wheel 22 and the true 23 a of the fourth wheel 23 are rotatably inserted inside the center pipe 21 driven into the main plate 4. The true or cylinder 24a of the hour wheel 24 is rotatably fitted on the outside of the center pipe 21. On the back cover side of the main plate 4, a second pinion 22b integral with the second pinion 22a and a second gear 22c slip-engaged with the second pinion 22a are provided, and a fourth gear 23c and the like are provided on the fourth pinion 23a. They are fitted and connected to each other via a train wheel (not shown). On the dial plate side of the main plate 4, a cylindrical pinion 24 b and a cylindrical gear 24 c are fitted to the true or cylinder 24 a of the hour wheel 24 and coupled to the second wheel 22 via a wheel train (not shown). A second hand 11, a minute hand 12, and an hour hand 13 are attached to ends of the fourth true stem 23 a, second true stem 22 a, and true (cylinder) 24 a of the hour wheel 24 that protrude from the dial 3.

  Various parts constituting the big date display mechanism 1 are arranged between the main plate 4, the cylindrical gear 24 c and the cylindrical pinion 24 b and the dial 3.

  As shown in FIG. 1 in addition to FIGS. 5 and 4, the big date display mechanism 1 includes a first date wheel 30 that can rotate in the C1 direction around the central axis C and displays the date of the first place, A second date indicator 50 which can rotate in the C1 and C2 directions around the axis C and displays the date of the tenth place, and a second date indicator feed wheel which transmits the rotation of the first date indicator 30 to the second date indicator 50 70.

  As shown in FIG. 2A in addition to FIGS. 4 and 1, the first date indicator 30 includes a disk-shaped first date indicator main body 31 and an inner peripheral edge of the first date indicator main body 31. And a short cylindrical portion 34 extending in the A1 direction (FIG. 4) toward the back cover side, and an extension end of the cylindrical portion 34, that is, an inner periphery of the back cover side end portion, along the circumferential direction. The first date indicator gear portion 36 in the form of an internal tooth having 31 teeth 35 and the inner peripheral side of the intermediate portion 39 in the longitudinal direction A of the cylindrical portion 34 are arranged in accordance with a predetermined rule R1. A plurality of claw portions or projections 40a, 40b, 40c, 40d for rotating the two-wheeled carriage (when collectively referred to or not distinguished from each other, it is represented by reference numeral 40, and when collectively referred to as a claw wheel portion 40) ).

  As can be seen from FIG. 2A, the annular surface (first date letter display surface) 31 a on the dial side of the first date indicator main body 31 has one of the dates from “01” to “31”. .., 8, 9, 9, 0, 1, 2,..., 8, 9, 0, 1, 2,. 9, 0, 1 ", that is, the first date characters 32 are displayed at equal intervals in the circumferential direction.

  During normal hand movement, the first date indicator gear portion 36 rotates at the tooth portion 35 by the F1 direction rotation of the date indicator claw 37a (FIG. 1) according to the F1 direction rotation of the date indicator driving wheel 37 accompanying the rotation of the hour wheel 24. In response, it is rotated in the C1 direction by 360/31 degrees every day.

  The first date indicator 30 is rotatably disposed in an annular recess 4a formed on the dial plate 3 side of the main plate 4, and the first date indicator gear portion 36 has a first date indicator holder 44 (FIG. 4). , And is confined in the recess 4a.

The plurality of protrusions 40 for rotating the second date indicator feed wheel of the first date indicator 30 are rotated by rotating the second date indicator feed wheel 70 when the date changes as indicated by the next arrow. The second date indicator 50 is rotated via the second date indicator feed wheel 70 ("Rule R1").
“09” → “10”
“19” → “20”
“29” → “30”
“31” → “1”

  That is, the first date indicator 30 has protrusions 40a, 40b, 40c, and 40d at circumferential portions Ea, Eb, Ec, Ed that rotate the second date indicator feeding wheel 70 in accordance with the rule R1. Furthermore, as will be described later, it has a protrusion 40f for forced return or the like (FIG. 1). In this example, there are four protrusions 40f, 40f1, 40f2, 40f3, and 40f4.

  The first date indicator wheel 30 includes a jumping claw portion 42 a that performs a jumping operation on the teeth 35, 35 of the gear portion 36 in the C1 direction rotation of the first date indicator gear portion 36 of the first date indicator 30. The jumper 42 dominates (FIG. 1).

  The second date indicator 50 includes a second date indicator main body 51 and a second date indicator return spring 65 that biases the second date indicator main body 51 in the C1 direction. The second date indicator main body 51 includes an annular plate-shaped second date indicator 52 and a date indicator wheel 53 integrated with the second date indicator 52 by caulking or the like. In 53b, it is fitted to the cylindrical portion 24a of the hour wheel 24 so as to be slidable and rotatable.

  The date indicator wheel 53 of the second date indicator 50 is arranged at equal intervals in the circumferential direction so as to protrude in the radial direction with respect to the partial cylindrical surface 54 forming a part of the cylinder. A fan-shaped or arcuate gear portion 56 having three teeth 55 and a concave portion 59 extending in the circumferential direction over the same extent as the circumferential expansion of the gear portion 56 are provided. Each tooth 55 includes a protrusion 57 and valleys 58 on both sides thereof, and the valleys 58 between adjacent protrusions 57 coincide or overlap to form one valley. Accordingly, the gear portion 56 has teeth 55a, 55b, and 55c (represented by reference numeral 55 when not distinguished from each other or generically), that is, projections 57a, 57b, and 57c (represented by reference numeral 57 when not distinguished from each other or generically). And valleys 58f, 58g, 58h, and 58j on both sides thereof (represented by reference numeral 58 when not distinguished from each other or generically). The teeth 55 of the gear portion 56 mesh with corresponding teeth of a second date indicator feeding wheel 70 described later.

  The second date indicator pressing projection 4 c of the base plate 4 is loosely fitted in the concave portion 59, and the C1 direction rotation of the date indicator wheel 53 of the second date indicator 50 causes the base plate 4 to be opposed to one end wall (side wall) 59 a of the concave portion 59. The second date indicator pressing projection 4c is adjusted (stopped) by contact or locking, and the C2 direction rotation of the date indicator wheel 53 of the second date indicator 50 is the main plate with respect to the other end wall (side wall) 59b of the recess 59. 4 is adjusted (stopped) by contact or locking of the second date indicator pressing projection 4c.

  The date indicator wheel 53 further includes a spring locking projection 53 a that locks one end of the second date indicator return spring 65.

  The second date indicator 50 is also displaced in the extending direction A of the axis C by the second date indicator press ring 60 (FIG. 4) engaged with the cylindrical portion 24 a of the hour wheel 24 in the vicinity of the dial 3. It is regulated.

  As can be seen from (b) of FIG. 2, the second date plate 52 includes an arc-shaped second date display surface portion 61 in the vicinity of the outer peripheral edge, and the second date display surface portion 61 includes a second date (10 The second date display area PD2 representing the second date and the first date display area PD1 representing the first date (the first date) are alternately formed.

  More specifically, the second date display area PD2 includes four areas PD2a, PD2b, PD2c, and PD2d. Each area PD2a, PD2b, PD2c, and PD2d includes second dates “0”, “1”, and “2”. "," 3 "are displayed. Still, the first date display area PD1 includes four openings PD1a, PD1b, PD1c, and PD1d. When each area PD1 is positioned in the first date display window area D1 of the date window D, the opening PD1 is displayed. Then, the first date on the date display surface of the first date indicator 30 is displayed.

  As can be seen from FIG. 2B, the second date plate 52 further includes arcuate openings or through-holes 63 separated from each other by the partition wall 62. This opening 63 enables small needle display. That is, since the expansion of the opening 63 in the circumferential direction is limited by the partition wall 62, the second date plate 52 is formed of a continuous plate, so that it is possible to display a small needle within the range of the opening 63. . In this example, the opening 63 includes four openings 63a, 63b, 63c, and 63d that are separated from each other. The size (expansion) and number of the openings 63 may be different, and some of the openings 63a, 63b, 63c, and 63d may be omitted. In that case, the partition part 62 should just expand in the area | region without an opening part, for example.

  The second date indicator return spring 65 is fixed to the main plate 4 at one end portion 66, and is locked to the spring locking projection 53 a of the date indicator wheel 53 of the second date indicator 50 at the other end portion 67. A C1 direction rotational shift force is exerted on the main body portion (second date indicator main body) 51 of the second date indicator 50 via the display wheel 53.

  As can be seen from FIG. 4 in addition to FIGS. 1 and 3 (a) and 3 (b), the second date indicator feed wheel 70 rotates at the central hole 71 to the cylindrical protrusion 4 b (FIG. 4) of the base plate 4. The first date indicator 30 and the second date indicator 50 are joined together freely. That is, the second date indicator feeding wheel 70 is a driven claw wheel or driven gear 72 as a driven gear portion that can rotate around the central axis Cf of the central hole 71 and the central axis Cf concentric with the driven claw wheel 72. A second date indicator driving claw wheel or a second date indicator driving gear 75 as a driving gear portion overlapping in the extending direction A is integrally provided. That is, the second date indicator feed wheel 70 is integrally provided with a two-stage claw wheel or gears 72 and 75. Depending on the relative rotational position of the second date indicator 50 with respect to the first date indicator 30, the teeth (claws) 73 of the driven gear (driven claw wheel) 72 and the teeth (claws) of the drive gear (drive claw wheel) 75 are Instead of overlapping in the A direction, it may be displaced by a predetermined angle relative to the circumferential direction or the rotational direction Cf1.

  As can be seen from FIG. 1 and FIG. 3 (a), the driven pawl wheel 72 constituting the first stage claw wheel or gear has eight claws or teeth 73a, 73b, 73c, 73d, 73e, 73f, 73g, 73h ( When it changes to the day “9 → 10”, the projecting portion 40a for rotating the second date indicator feeding wheel of the first date indicator 30 is a driven claw wheel. The driven pawl wheel 72 is engaged with the claw 73a of 72 and rotated by one step in the Cf1 direction. Similarly, when changing to the “19 → 20” day, changing to the “29 → 30” day, and changing to the “31 → 1” day, the projection for rotating the second date indicator feeding wheel of the first date indicator 30 is performed. The portions 40b, 40c, and 40d engage with the claws 73b, 73c, and 73d of the driven claw wheel 72, respectively, and rotate the driven claw wheel 72 by one step in the Cf1 direction.

  Furthermore, when the date changes from “01 → 02”, from “02 → 03”, from “03 → 04” and from “04 → 05”, The projections 40f, 40f, 40f, 40f for rotating the second date wheel feed wheel engage with the claws 73e, 73f, 73g, 73h of the driven claw wheel 72, respectively, so that the driven claw wheel 72 is moved in the Cf1 direction. Rotate only one step.

  The Cf1 direction rotation of the driven claw wheel 72 of the second date wheel feeding wheel 70 includes a jumping claw portion 81 and a spring portion 82, and is engaged with the driven claw wheel 72 by the jumping claw portion 81 to perform a jumping operation. The second day wheel carriage jumper 80 that performs

  In this case, the rotation of the driving claw wheel 75 in the Cf1 direction is formally the same as the above case, but the second date wheel integrated with the driven claw wheel (driven gear) 72 as described below. Since the state of the driving pinion wheel (second date indicator driving gear) 75 is different, the role is completely different from the viewpoint of involvement in the rotation of the second date indicator 50.

  That is, unlike the driven claw wheel 72 having eight pawls 73 at equal intervals in the circumferential direction and forming a first stage claw wheel or gear, the second date indicator driving claw wheel 75 forming a second stage claw wheel or gear is With respect to the circumferential direction, the claw 76 is disposed asymmetrically, and a portion without the claw 76 is a small-diameter partial cylindrical surface 77. The claw 76 of the driving claw wheel 75 includes three claws 76a, 76b, and 76c arranged at the same interval as the claw 73 of the driven claw wheel 72 in the circumferential direction. In other words, the second date indicator driving claw wheel 75 is in the form of a missing gear having only three teeth 76a, 76b, 76c and lacking the other five teeth, and the three teeth 76a, 76b, 76c are: As will be described next, the teeth of the second date indicator 50 mesh with the three teeth (claws) 57a, 57b, 57c of the date indicator wheel 53.

  More specifically, when the claw 40a of the first date indicator 30 is engaged with the claw 72a of the driven claw wheel 72 of the second date indicator feeding wheel 70 to rotate the driven claw wheel 72 in the Cf1 direction, The first claw 76a is provided at a circumferential position that engages with the first claw 57a of the date indicator wheel 53 of the car 50 and rotates the date indicator wheel 53 in the C2 direction. In this example, the claw 76a of the driving claw wheel 75 overlaps with the claw 73f of the driven claw wheel 72 in the A direction.

  Similarly, when the claws 40b, 40c of the first date indicator 30 are engaged with the claws 72b, 72c of the driven claw wheel 72 of the second date indicator feed wheel 70 to rotate the driven claw wheel 72 in the Cf1 direction, The remaining two claws 76b and 76c are provided at circumferential positions that engage with the claws 57b and 57c of the date indicator wheel 53 of the second date indicator 50 to rotate the date indicator wheel 53 in the C2 direction. In this example, the claws 76b and 76c of the driving claw wheel 75 overlap with the claws 73g and 73h of the driven claw wheel 72 in the A direction.

  However, depending on the number of claws of the driven claw wheel 72 of the second date indicator feeding wheel 70, the inner diameter of the first date indicator gear portion 31, and the outer diameter of the date indicator wheel 53 of the second date indicator 50, The relative position can be different.

  The pawls 40a, 40b, 40c of the first date wheel 30 are engaged with the corresponding gears or pawls 72a, 72b, 72c of the second date wheel feeding wheel 70 or the driven pawl wheel 72 to rotate the driven pawl wheel 72. Except for this time, the driving claw wheel 75 of the second date indicator feeding wheel 70 integrated with the driven claw wheel 72 does not mesh with or engage with the gear portion 56 of the date indicator wheel 53 of the second date indicator 50.

  When the claw 40d of the claw wheel 40 of the first date indicator 30 is engaged with the driven claw 72d of the second date indicator feeding wheel 70 or the corresponding claw 72d of the driven claw wheel 72 to rotate the driven claw wheel 72, the driving gear or The engagement or engagement of the teeth or claw 76 of the driving claw wheel 75 and the teeth 55 or claw 57 of the date indicator wheel 53 is released. As a result, the date indicator wheel 53 through the second date indicator 50 are allowed to freely rotate, and the date indicator wheel 53 through the second date indicator 50 are under the action of the second date indicator return spring 65 so that the side wall 59a of the recess 59 is the main plate. 4 is returned to the initial position where it abuts against the second date indicator pressing projection 4c, and is maintained at the initial position until it is rotationally driven again.

  Next, the date display operation of the timepiece 2 provided with the big date display mechanism 1 configured as described above will be described.

  At the beginning of the month, that is, the date “1” on the date display surface 31a of the first date indicator 30 is located in the first date display area (opening) PD1a of the second date indicator 50, and the first date display on the date window D On the first day (one day) displayed from the window area D1, the date indicator wheel 53 of the second date indicator 50 is under the action of the elastic restoring force of the second date indicator return spring 65, as shown in FIG. The initial position where one side wall 59a of the recess 59 abuts on the locking projection 4c of the main plate 4 is taken. At this time, the second date indicator return spring 65 takes a state in which the engagement end 67 is expanded to the maximum with the engagement end 67 engaged with the projection 53 of the date indicator wheel 53.

  On the other hand, at this time, as shown in FIG. 8, the first claw 40 f of the claw 40 f of the first date indicator 30 tries to engage with the claw 73 of the driven claw wheel 72 of the second date indicator feed wheel 70. Take position. More specifically, if the day 1 is changed to day 2 as shown in FIG. 8, the first claw 40f1 of the first date indicator 30 is moved to the driven claw wheel of the second date indicator feed wheel 70 as shown in FIG. 72, the driven claw wheel 72 of the second date indicator feeding wheel 70 is to be rotated in the Cf1 direction.

  When the second date indicator feeding wheel 70 rotates in the F1 direction, the second date indicator driving claw wheel 75 is moved to the claw portion 55 of the date indicator wheel 53 of the second date indicator 50 by the partial cylindrical surface 77. Since they face each other, the Cf1 direction rotation of the second date indicator driving claw wheel 75 does not affect the date indicator wheel 53, and the second date indicator 50 does not rotate.

  Similarly, when the date changes from the "2" day to the "3" day, the claw 40f2 of the first date indicator 30 engages with the claw 73f of the driven claw wheel 72 of the second date indicator feed wheel 70, and the driven claw. Although the vehicle 72 is rotated in the F1 direction by one step, the second date indicator 50 is kept stopped. When the date changes from the "3" day to the "4" day, the claw 40f3 of the first date indicator 30 engages with the claw 73g of the driven claw wheel 72 of the second date indicator feed wheel 70, and the driven claw wheel. 72 is rotated in the direction of Cf1 by one step, but the second date indicator 50 is kept in a stopped state, and when the date changes from the “4” day to the “5” day, the claw 40f4 of the first date indicator 30 is Although the second claw wheel 72 is engaged with the claw 73h of the driven claw wheel 72 of the second date indicator feeding wheel 70 and the driven claw wheel 72 is rotated in the Cf1 direction by one step, the second date wheel 50 is kept in a stopped state.

  Thereafter, until the date reaches “9”, the claw 40 does not engage with the claw 73 of the driven claw wheel 72 of the second date wheel feeding wheel 70 even if the first date wheel 30 further rotates in the C1 direction. Therefore, both the second date indicator feeding wheel 70 and the second date indicator 50 are kept stopped.

  When the date changes from the “9” day to the “10” day, the state shown in FIG. 1 is adopted. That is, when the date changes from the “9” day to the “10” day, the claw 40a of the first date indicator 30 is changed to the claw 73a of the driven claw wheel 72 of the second date indicator feed wheel 70 as shown in FIG. Engage and rotate the driven claw wheel 72 by one step in the Cf1 direction. At this time, the claw 76a of the driving claw wheel 75 of the second date indicator feeding wheel 70 is engaged with the teeth 55a of the date indicator wheel 53 of the second date indicator 50, that is, the claw or protrusion 57a, and the spring of the return spring 65 is reached. The date indicator wheel 53 is rotated in the C2 direction by one step against the force. As a result, the second date indicator 50 rotates, the second date display area PD2b moves to the second date display window area D2 of the date window D, and the date of the "10" position changes from "0" to " Change to 1 ”.

  When the second date indicator feed wheel 70 is rotated as described above, the second date indicator feed wheel 70 is greatly controlled by the jumper 80 in the driven gear or the driven claw wheel 72. The rotational position of the date indicator feed wheel 70 can be accurately determined so that the deviation due to the variation in the component dimensions is minimized. Further, the date indicator wheel 53 or the date indicator wheel 53 that is forcibly rotated against the return spring 65 by the drive gear or the driving claw wheel 75 of the second date indicator feeding wheel 70 in which definite positioning is performed in this way (integrally with this). Since the rotational position of the second date indicator 50 is determined by the return spring 65 that is rotationally biased in one direction, it can be accurately determined without uncertainty such as backlash. Therefore, the possibility that a position shift of the date of “10” by the second date indicator 50 may be minimized.

  Next, when the date changes from the “10” day to the “11” day, a state as shown in FIG. 6 is adopted. That is, when the date changes from the “10” day to the “11” day, the claw 40 that engages with the claw 73 of the driven claw wheel 72 of the second date indicator feeding wheel 70 is shown in FIG. Since the 1st date indicator 30 does not exist in the 1st date indicator 30, even if the 1st date indicator 30 rotates one step in the C1 direction, the 2nd date indicator feed wheel 70 is kept stopped and the 2nd date indicator 50 is also kept stopped. Be drunk. However, the tooth 55a or the protrusion 57a of the date indicator wheel 53 is moved in the C2 direction by one claw so that the second date indicator 50 resists the elastic force of the return spring 65. The second date wheel feeding wheel 70 is engaged with the claw 76a of the driving claw wheel 75, and the driven claw wheel 72 is kept in the state regulated by the jumper 80.

  Until the date reaches “19”, the C1 direction rotation position of the first date indicator 30 changes by one step, and the first date display window area D1 and the first date display area (opening) PD1b of the date window D 6 is maintained in the same state as shown in FIG. 6 except that the date displayed via the button increases day by day.

  Further, when the date changes from the “19” day to the “20” day, the rotation of the first date indicator 30 is rotated via the second date indicator feed wheel 70 in the same manner as shown in FIG. 50. However, the nail | claw with which nail | claw 40,73,76,55 (57) relates is different (it has shifted | deviated adjacently).

  That is, when the date changes from the “19” day to the “20” day, the claw 40b of the first date indicator 30 is moved to the claw 73b of the driven claw wheel 72 of the second date indicator feed wheel 70, as in the case of FIG. And the driven claw wheel 72 is rotated by one step in the F1 direction so that the claw 76b of the driving claw wheel 75 of the second date indicator feeding wheel 70 is a tooth 55b or protrusion of the date indicator wheel 53 of the second date indicator 50. The date indicator wheel 53 is further rotated in the C2 direction by one step against the spring force of the return spring 65 by engaging with 57b. As a result, the second date indicator 50 rotates, the second date display area PD2c moves to the second date display window area D2 of the date window D, and the date of the "10" position changes from "1" to " 2 ”.

  Even when the second date indicator feed wheel 70 is rotated, the second date indicator feed wheel 70 is greatly rotated by the jumper 80 in the driven claw wheel 72. The rotational position of the vehicle 70 can be accurately determined so that the deviation due to the variation in component dimensions is minimized. Further, the second date indicator 50 integrated with the date indicator wheel 53 forcibly rotated against the return spring 65 by the driving claw wheel 75 of the second date indicator feed wheel 70 in which definite positioning is performed as described above. The rotational position of can be accurately determined without uncertainty such as backlash. Therefore, the possibility that a position shift of the date of “10” by the second date indicator 50 may be minimized.

  Next, when the date changes from the “20” day to the “21” day, a state substantially similar to that shown in FIG. 6 is adopted. That is, the claw 40 that engages with the claw 73 of the driven claw wheel 72 of the second date indicator feeding wheel 70 is not provided in the first date indicator 30, so the first date indicator 30 rotates one step in the C1 direction. Even so, the second date indicator feeding wheel 70 is kept in the stopped state, and the second day indicator 50 is also kept in the stopped state. However, with the second date indicator 50 rotated in the C2 direction by two claws so as to resist the elastic force of the return spring 65, the teeth 55b or protrusions 57b of the date indicator wheel 53 are provided on the second date indicator feed wheel. The second date wheel feeding wheel 70 is engaged with the claw 76b of the driving claw wheel 70 of 70, and the driven claw wheel 72 is kept in the state regulated by the jumper 80. Until the date reaches “29” day, the C1 direction rotation position of the first date indicator 30 changes by one step, and the first date display window region D1 and the first date display region (opening) PD1c of the date window D 6 is maintained in the same state as shown in FIG. 6 except that the date displayed via the button increases day by day.

  Further, when the date changes from the "29" day to the "30" day, the claw 40c of the first date indicator 30 is moved to the claw 73c of the driven claw wheel 72 of the second date indicator feed wheel 70, as in the case of FIG. And the driven claw wheel 72 is rotated by one step in the F1 direction so that the claw 76c of the driving claw wheel 75 of the second date indicator feeding wheel 70 is a tooth 55c or protrusion of the date indicator wheel 53 of the second date indicator 50. The date indicator wheel 53 is further rotated in the C2 direction by one step against the spring force of the return spring 65 by engaging with 57c. As a result, the second date indicator 50 rotates, the second date display area PD2d moves to the second date display window area D2 of the date window D, and the date of “10” is changed from “2” to “ Change to 3 ”. In this case, the circumferential position of the second date indicator 50 can be accurately determined as in the case described above.

  Next, when the date changes from the “30” day to the “31” day, a state substantially similar to that shown in FIG. 6 is adopted. That is, the claw 40 that engages with the claw 73 of the driven claw wheel 72 of the second date indicator feeding wheel 70 is not provided in the first date indicator 30, so the first date indicator 30 rotates one step in the C1 direction. Even so, the second date indicator feeding wheel 70 is kept in the stopped state, and the second day indicator 50 is also kept in the stopped state. However, the tooth 55c or the projection 57c of the date indicator wheel 53 is moved to the second date indicator feeding wheel in a state in which the second date indicator 50 is rotated in the C2 direction by three claws so as to resist the elastic force of the return spring 65. The second date wheel feeding wheel 70 is engaged with the claw 76c of the driving claw wheel 75 of 70, and the driven claw wheel 72 is kept in the state regulated by the jumper 80.

  Next, when the date changes from the “31” day to the “1” day, the claw 40d of the first date indicator 30 is moved to the claw 73d of the driven claw wheel 72 of the second date indicator feed wheel 70 as shown in FIG. And the driven claw wheel 72 is rotated by one step in the F1 direction so that the claw 76c of the driving claw wheel 75 of the second date indicator feeding wheel 70 is a tooth 55c or protrusion of the date indicator wheel 53 of the second date indicator 50. The date indicator wheel 53 is further rotated in the C2 direction by one step against the spring force of the return spring 65 by engaging with 57c. As a result, the second date indicator 50 slightly rotates in the C2 direction. With such rotation, the engagement support of the teeth 55 or the protrusions 57 of the date indicator wheel 53 by the claw 76 of the driving claw wheel 75 of the second date indicator feeding wheel 70 is lost. Accordingly, the second date indicator 50 is suddenly rotated in the C1 direction under the action of the return spring 65. The rotation in the C1 direction is stopped when the side wall 59a of the recess 59 is locked by the locking protrusion 4c of the main plate 4. In this way, the date returns to the first day (“1” day), and the second date indicator 50 returns to the initial position. At this time, the 1st date indicator 30 goes around once in the C1 direction and returns to the initial position.

  In the above, the second date indicator 50 is reciprocated in the C2 and C1 directions within the range of the spread angles of the three teeth 55a, 55b, and 55c, and is not rotated once. It is possible to perform display using small hands in the area (for example, display of chronograph, chronograph minutes and chronograph seconds around the central axes Ch, Cm, Cs as shown in the clock of FIG. 5). It is. The small hand is displayed as a 24-hour display instead of the chronograph hour, or a normal hand second instead of the chronograph second (in this case, for example, around the central axis C, the chronograph instead of the second hand). (The graph second hand may rotate).

  In the above description, an example in which the date display window D of the big date is at the 12 o'clock position of the timepiece 2 is shown, but the date display window may be at another location such as the 6 o'clock position.

  In the above, the protrusion part 40 directly related to rotation of the second date indicator 50 in the first date indicator 30 is the four protrusion parts 40a, 40b, 40c, and 40d. Similarly, in the second date indicator feeding wheel 70, more than four of the claws or teeth 73 of the driven claw wheel 72 are for effectively transmitting the rotation in a limited spatial arrangement. In this example, four nails or teeth 73 are fed in an idle manner. That is, four projections directly related to the rotation of the second date indicator 50 among the eight projection portions 40a, 40b, 40c, 40d, 40f1, 40f2, 40f3, and 40f4 constituting the projection portion 40 of the first date indicator 30. The four projecting portions 40f1, 40f2, 40f3, 40f4 other than the portions 40a, 40b, 40c, 40d feed the four claws or teeth 73 of the driven claw wheel 72 of the second date wheel feeding wheel 70, The driving claw wheel 75 of the second date indicator feeding wheel 70 has a claw in a corresponding region and has a partial cylindrical surface 77.

  Accordingly, if the number of the claws 73 of the driven claw wheel 72 as the driven gear portion of the second date indicator feeding wheel 70 is N, the number of the claws 73 exceeding four (N-4) can be skipped. The 1st date indicator 30 is provided with an extra protrusion 40f by the number (N-4). The number N of the claws 73 is determined in consideration of smooth transmission of rotation. However, in order not to overlap with the next protrusion 40a, (N−4) ≦ 8.

  In the above, the example has been described in which the second date indicator feed wheel 70 also makes one revolution while the first date indicator 30 makes one revolution, but the second date indicator feed wheel while the first date indicator 30 rotates a plurality of times. 70 may rotate once.

  FIG. 9 shows a big date display mechanism 1Q according to another embodiment of the present invention in which the second date indicator feed wheel 70 is rotated once while the first date indicator 30 rotates twice.

  In the big date display mechanism 1Q of FIG. 9, the same reference numerals are given to the same elements and parts as those of the big date display mechanism 1 of FIG. 1 to FIG. A suffix Q is added at the end.

  In the big date display mechanism 1Q of the modified example shown in FIG. 9, the claw wheel portion or claw portion 40Q of the first date indicator 30Q is a claw 40a that works during the transition from the 9th day to the 10th day, from the 19th day to the 20th day. Of the big date display mechanism 1, including a claw 40 b that works during the transition from 1 to 29, a claw 40 c that works during the transition from the 29th to the 30th, and a claw 40 d that works during the transition from the 31st to the 1st. Unlike the claw portion 40 of the first date wheel 30, the claw portions 40f1, 40f2, 40f3, 40f4 for idle feeding are not included (the claw portion 40f for idle feeding is missing).

  In the big date display mechanism 1Q, the driven claw wheel 72Q as the driven gear part of the second date indicator feed wheel 70Q is a claw part 40a, 40b, 40c, 40d that constitutes the claw wheel part 40Q of the first date indicator 30Q. In addition to the first set of claw portions 73a, 73b, 73c and 73d respectively operated by the second set, the second set of claw portions 40a, 40b, 40c and 40d respectively operated similarly to the first set of claw portions. Claw portions 73aQ, 73bQ, 73cQ, 73dQ are provided. Accordingly, the driven claw wheel 72Q of the second date indicator feeding wheel 70Q is rotated once by the claw portion 40Q of the first date indicator 30 being rotated twice. Here, as far as the form is concerned, the second set of claw portions 73aQ, 73bQ, 73cQ, 73dQ of the driven claw wheel 72Q of the second date indicator feeding wheel 70Q are the second shown in FIG. 1 and FIG. 3, respectively. Corresponding to the claw portions 73e, 73f, 73g, 73h of the driven claw wheel 72 of the date wheel feeding wheel 70, both coincide with each other (there is a drive claw wheel 75Q as a drive gear portion to be described next, Its function is different).

  That is, in the big date display mechanism 1Q, the driving claw wheel or the driving gear 75Q as the driving gear portion of the second date indicator feeding wheel 70Q has a short partial cylindrical shape with a first set of claw portions or tooth portions 76a, 76b, 76c. In addition to the portion (the portion lacking the claw) 77Q1, it has a second set of claw portions 76aQ, 76bQ, 76cQ and a short partial cylindrical portion (a portion lacking the claw) 77Q2. In other words, this driving claw wheel (driving gear) 75Q has a form of ((3 teeth + 1 missing tooth) + (3 teeth + 1 missing tooth)), and (3 teeth + 1 missing tooth) is repeated twice. is there.

  Here, when the first set of claw portions 73a, 73b, 73c of the driven claw wheel 72Q of the second date indicator feeding wheel 70Q are actuated by the claw portions 40a, 40b, 40c of the first date indicator 30Q, respectively, The first pair of claw portions 76a, 76b, 76c of the driving claw wheel 75Q of the date indicator feeding wheel 70Q are engaged with the projections 57a, 57b, 57c of the date indicator wheel 53 of the second date indicator 50, respectively. When the second date wheel is rotated and the first pair of claw portions 73d of the driven claw wheel 72Q of the second date wheel feeding wheel 70Q is actuated by the claw portion 40d of the first date wheel 30Q, a short portion of the driving claw wheel 75 is obtained. Cylindrical part (part lacking the claw) 77Q1 faces the date indicator wheel 53 of the second date indicator 50, the rotation regulation for the return spring 65 is lost, and the second date indicator 50 is returned to the C1 direction by the return spring 65. It is.

  Similarly, when the second set of claw portions 73aQ, 73bQ, 73cQ of the driven claw wheel 72Q of the second date indicator feeding wheel 70Q are operated by the claw portions 40a, 40b, 40c of the first date indicator 30Q, respectively, The second pair of claw portions 76aQ, 76bQ, 76cQ of the driving claw wheel 75Q of the date indicator feeding wheel 70Q are engaged with the projections 57a, 57b, 57c of the date indicator wheel 53 of the second date indicator 50, respectively. When the second date wheel is rotated and the second claw portion 73dQ of the driven claw wheel 72Q of the second date indicator feeding wheel 70Q is actuated by the claw portion 40d of the first date wheel 30Q, a short portion of the driving claw wheel 75 is obtained. Cylindrical part (part lacking the claw) 77Q2 faces the date indicator wheel 53 of the second date indicator 50, the rotation regulation for the return spring 65 is lost, and the second date indicator 50 is returned to the C1 direction by the return spring 65. It is.

  Here, the claw portions 76aQ, 76bQ, and 76cQ of the driving claw wheel 75Q are located at portions overlapping with the claw portions 73b, 73c, and 73d of the driven claw wheel 72Q in the A direction. When the claw portions 73aQ, 73bQ, 73cQ are rotated by the claw portion 40Q of the first date indicator 30Q, the claw portions 76aQ, 76bQ, 76cQ of the driving date wheel 75Q are the projections 57 of the date indicator wheel 53 of the second date indicator 50. And the second date indicator 50 is rotated.

  It will be apparent that the big date display mechanism 1Q of the timepiece 2Q of this modification works in the same way as the big date display mechanism 1 of the timepiece 2 of the embodiment shown in FIGS.

1,1Q Big date display mechanism 2,2Q Clock 3 Dial 4 Base plate 4a Annular recess 4b Cylindrical protrusion 4c Second date wheel holding protrusion 11 Second hand 12 Minute hand 13 Hour hand 14 Chronograph second hand 15 Chronograph minute hand 16 Chronograph hour hand 21 Center pipe 22 Second wheel 22a Second wheel 22b Second wheel 22c Second gear 23 Fourth wheel 23a Fourth wheel 23c Fourth gear 24 Hour wheel 24a Hour of wheel
24b cylindrical pinion 24c cylindrical gears 30, 30Q first date wheel 31 first date wheel main body 31a dial side annular surface (first date letter display surface)
34 Short cylindrical portion 35 Tooth portion 36 First date wheel gear portion 37 Date indicator driving wheel 39 Intermediate portion 40, 40Q Claw wheel portion 40a, 40b, 40c, 40d, 40Q Projection portion for rotation of second date indicator feed wheel (nail Part)
40f, 40f1, 40f2, 40f3, 40f4 Projection part for nipping (claw part)
42 First date wheel jumper 42a Jump control claw portion 50 Second date wheel 51 Second date wheel main body 52 Second date plate 53 Date indicator wheel 53a Spring locking projection 53b Central hole 54 Partial cylindrical surfaces 55, 55a, 55b , 55c Teeth 56 Fan-shaped or arcuate gears 57, 57a, 57b, 57c Protrusions 58, 58f, 58g, 58h, 58j Valley portions 59 Circumferentially extending recesses 59a, 59b End walls (side walls)
60 Second date indicator press ring 61 Second date display surface portion 62 Partition portion 63, 63a, 63b, 63c, 63d Opening portion 65 Second date indicator return spring 66, 67 End portion 70, 70Q Second date indicator feed wheel 71 Center Hole 72, 72Q driven claw wheel (driven gear)
73, 73a, 73b, 73c, 73d, 73e, 73f, 73g, 73h, 73aQ, 73bQ, 73cQ, 73dQ Nail (teeth)
75,75Q Day 2 wheel drive pinion (drive gear)
76, 76a, 76b, 76c, 76aQ, 76bQ, 76cQ Claw 77, 77Q1, 77WQ2 Partial cylindrical surface 80 Second date wheel feeder jumper 81 Jumping claw portion 82 Spring portion A, A1 Back cover direction (thickness direction)
C, Cf, Ch, Cm, Cs Center of rotation (axis)
C1, C2, Cf1 Rotation direction D Date display window D1 First date display window area D2 of date window Second date display window area Ea, Eb, Ec, Ed of date window Circumferential region R1 Predetermined rule F1 Rotation direction PD1, PD1a, PD1b, PD1c, PD1d First date display area (opening)
PD2, PD2a, PD2b, PD2c, PD2d Second date display area

Claims (10)

A first day wheel that is rotated by a certain angle every day,
A second date wheel that is concentric with the first date wheel and is rotated every time the tens place date changes,
A big date display mechanism having a second date indicator for transmitting rotation of the first date indicator to the second date indicator,
The second date indicator feeding wheel is arranged in an annular region between the first and second date indicator and is configured to be rotated in one direction, and the driven gear portion and the driving gear portion are concentrically and at different positions in the axial direction. Integrally prepared,
The first date wheel has a claw wheel portion having a plurality of claw portions engageable with the teeth of the driven gear portion of the second date wheel feeder,
The second date indicator has a fan-shaped gear portion having a plurality of tooth portions engageable with the teeth of the drive gear portion of the second date indicator feeding wheel,
A big date display mechanism further comprising a return spring for rotating the second date indicator in the reverse direction and returning it to the original rotational position when the second date indicator is rotated by the angular range of the sector gear portion.   2. The big date display mechanism according to claim 1, further comprising a second date indicator jumper for controlling the second date indicator feed vehicle.   3. The big date according to claim 1, wherein when the second date indicator is rotated in the return direction by the return spring, the rotation of the second date indicator in the return direction is regulated by contacting the stopper. Display mechanism.   The drive gear portion of the second date indicator feed wheel is provided with a missing tooth portion lacking teeth in a part of its circumferential direction, and when the missing tooth portion faces the sector gear portion of the second date indicator, the sector gear portion is The big date display mechanism according to any one of claims 1 to 3, wherein the big date display mechanism is configured to be rotatable in a non-engaged state with respect to a drive gear portion of a second date indicator feeding wheel.   The big date display mechanism according to any one of claims 1 to 4, wherein the claw wheel portion of the first date indicator is provided with a claw portion for idle feeding that is not accompanied by rotation of the second date indicator.   The big date display mechanism according to any one of claims 1 to 5, wherein the second date indicator feed wheel is rotated once while the first date indicator is rotated once.   The claw wheel portion of the 1st date indicator is provided with four idle feed claw portions, the driven gear portion of the 2nd date indicator feed wheel is provided with 8 tooth portions, and the drive gear portion of the 2nd date indicator feed wheel is The big date display mechanism according to claim 6, comprising three tooth portions and five missing tooth portions.   The big date display mechanism according to any one of claims 1 to 4, wherein the second date indicator feed wheel is rotated a plurality of times while the first date indicator is rotated once.   The driven gear portion of the second date indicator feed wheel has eight teeth, and the drive gear portion of the second date indicator feed wheel has two sets of three teeth and one set of missing teeth. Item 9. The big date display mechanism according to Item 8.   A timepiece comprising the big date display mechanism according to any one of claims 1 to 9.

Images