CN113341674B

CN113341674B - Guide mechanism, information display mechanism, movement and timepiece

Info

Publication number: CN113341674B
Application number: CN202110228888.4A
Authority: CN
Inventors: 幸田雅行; 森裕一; 藤枝久; 铃木重男
Original assignee: Seiko Chronometer Co ltd
Current assignee: Seiko Chronometer Co ltd
Priority date: 2020-03-02
Filing date: 2021-03-02
Publication date: 2024-03-08
Anticipated expiration: 2041-03-02
Also published as: CN113341674A; JP2021139637A; JP6766283B1; CH717215A2

Abstract

The invention relates to a guide mechanism, an information display mechanism, a movement and a timepiece, which can stably and accurately guide a display wheel displaying information for a long period of time, and can reduce the number of parts and improve the cost and maintenance. A guide mechanism (130) is provided, which is provided with a plurality of internal teeth (92) and is used for rotationally guiding a display wheel (90) displaying information around an axis (C) at a predetermined period, and is provided with a rotary guide part (140) which is formed separately from a main plate (11) and is combined with the main plate in a state of being arranged on the inner side in the radial direction than the internal teeth, wherein the rotary guide part is provided with a guide surface (141) which is positioned at the same height as the internal teeth in the thickness direction of the main plate, and the guide surface is a curved surface which is formed by taking the axis as the center and is formed by a radius (R2) below the radius of a rotation track of a tooth tip in the internal teeth, and is opposite to at least more than 2 internal teeth from the inner side in the radial direction.

Description

Guide mechanism, information display mechanism, movement and timepiece

Technical Field

The invention relates to a guiding mechanism, an information display mechanism, a movement and a timepiece.

Background

Conventionally, a timepiece including a calendar mechanism is known as a timepiece that displays information other than time. Generally, a calendar mechanism includes: a date wheel for displaying a date; changing the day wheel, rotating for 24 hours for one turn, and rotating the day wheel corresponding to 1 step (corresponding to 1 day); and a correction member such as a date jumper for correcting the date wheel to an appropriate position. The date wheel is rotatably supported with respect to the main plate and has internal teeth throughout the entire circumference of the inner peripheral portion. The date changing wheel has a date changing claw capable of engaging with an inner tooth of the date wheel, and can feed a date to the date wheel via the date changing claw. Therefore, the date can be switched by rotating the date wheel by 1 step at, for example, 24 arrival time points by rotating the date wheel.

However, in such calendar mechanisms, the date wheel needs to be rotatably supported (guided) in a state of being positioned in the planar direction on the main plate. In this regard, many date wheels are often positioned in a planar direction by date wheel guide portions integrally formed on a main plate, and are rotationally guided. Specifically, for example, a date wheel guide portion having a guide surface with which the internal teeth are in contact or come close to each other, which is disposed on the inner side in the radial direction than the internal teeth of the date wheel, is often integrally formed with the main plate by cutting. Thus, the date wheel can be positioned in the planar direction by the guide surface of the date wheel guide portion, and the date wheel can be rotationally guided while the internal teeth are in sliding contact with the guide surface.

However, from the viewpoint of machinability and the like, the main plate is mostly formed of a copper-based metal material such as brass. Therefore, the entire main plate including the date indicator guide has lower mechanical strength than, for example, stainless steel, and the guide surface is likely to be thinned or deformed due to contact (sliding contact) of the internal teeth or the like caused by rotation of the date indicator. Therefore, there is a possibility that quality degradation is caused with long-term use.

Then, for example, as shown in patent document 1 below, a calendar mechanism is known in which positioning and rotation guidance in the plane direction of a date wheel are performed by a plurality of rolling elements rotatably supported by a main plate.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2004-144482.

Disclosure of Invention

Problems to be solved by the invention

However, in the calendar mechanism described in patent document 1, a plurality of rolling elements are required, and a support member such as a pin for combining these rolling elements with a main plate is also required. Therefore, not only is the number of parts increased, but also it is difficult to reduce the cost, and there are drawbacks such as a decrease in maintainability. Further, it is necessary to combine a plurality of rolling elements with excellent accuracy with respect to the main plate, but it is difficult to perform high-accuracy assembly due to a machining deviation of the rolling elements, an assembly error, or the like. Therefore, the accuracy of the rotation guide of the date wheel is likely to be lowered, and there is room for improvement in quality stability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a guide mechanism, an information display mechanism, a movement, and a timepiece, which can stably and precisely guide a display wheel for displaying information in a rotation over a long period of time, and which can reduce the number of parts and improve the cost and maintenance.

Means for solving the problems

(1) The guide mechanism according to the present invention is a guide mechanism having a plurality of internal teeth and configured to rotationally guide an annular display wheel on which information is displayed about an axis line at a predetermined cycle, and is characterized by comprising a rotational guide portion that is formed separately from a main plate and that is combined with the main plate in a state of being disposed further inward in a radial direction of the display wheel than the internal teeth, wherein the rotational guide portion has a guide surface that is positioned at the same height as the internal teeth in a thickness direction of the main plate, and wherein the guide surface is a curved surface that is formed with a radius equal to or smaller than a radius of a rotational locus of a tooth tip in the internal teeth centering on the axis line, and is opposed to the internal teeth of at least 2 teeth from the inner side in the radial direction.

According to the guide mechanism of the present invention, the rotation guide portion combined with the main plate has the guide surface which is disposed further inside in the radial direction than the plurality of internal teeth and which faces from the inside in the radial direction with respect to at least 2 or more internal teeth. In particular, the guide surface is formed with a radius equal to or smaller than a radius of a rotation locus of each tooth tip of the plurality of internal teeth, and is located at the same height as the internal teeth in the thickness direction of the main plate. Therefore, the internal teeth of at least 2 teeth in the display wheel can be brought into contact with the guide surface, and the display wheel can be positioned in the planar direction of the main plate. Further, when the display wheel rotates around the axis line in a predetermined cycle, the display wheel can be restrained from moving in the planar direction of the main plate. In addition, since the internal teeth can be brought into sliding contact with the guide surface when the display wheel rotates, the display wheel can be rotationally guided.

In particular, since the rotation guide portion can be formed separately from the main plate, the rotation guide portion can be formed completely without being limited by the main plate. Therefore, the rotation guide portion can be formed in consideration of, for example, mechanical strength, hardness, sliding characteristics, and the like, and the degree of freedom in material selectivity can be improved. Therefore, damage, deformation, and the like to the guide surface due to contact with the internal teeth, collision, sliding contact, and the like can be suppressed, and degradation of the rotation guide portion including the guide surface can be suppressed. Therefore, the display wheel can be stably and accurately rotatably guided over a long period of time. Further, since only the rotation guide portion having the guide surface is combined with the main plate, the number of parts can be suppressed unlike the case of using the conventional rolling elements or the like, and the cost can be reduced and the maintainability can be improved. In addition, unlike conventional rolling elements and the like, the guide surface can be machined with excellent accuracy, and machining variations and the like are less likely to occur.

(2) The rotation guide portion may be formed of a high-hardness material having a hardness higher than that of the main plate.

In this case, when the main plate is made of a copper-based metal material such as brass, which is generally used, the rotation guide portion may be made of a high-hardness material such as carbon steel, stainless steel, or ceramic. Therefore, the entire rotation guide portion including the guide surface can be formed hard, and resistance to friction can be improved. Therefore, damage, deformation, and the like are less likely to occur on the guide surface due to contact with the internal teeth, collision, sliding contact, and the like, and deterioration of the rotation guide portion including the guide surface can be further suppressed.

(3) The rotation guide portion may have a coating layer having a smaller friction coefficient than the main plate at least on the guide surface.

In this case, since at least the guide surface is covered with the cover layer having a smaller friction coefficient than the main plate, the sliding characteristic of the guide surface can be improved. Therefore, damage, deformation, and the like to the guide surface due to contact with, collision with, sliding contact with, and the like of the internal teeth can be effectively suppressed, and deterioration of the rotation guide portion including the guide surface can be further suppressed.

(4) The display device may further include an auxiliary guide portion provided on the main plate so as to be arranged side by side with respect to the rotation guide portion in a circumferential direction of the display wheel, wherein the auxiliary guide portion includes an auxiliary guide surface located at the same height as the internal teeth in a thickness direction of the main plate, and the auxiliary guide surface is a curved surface formed with a smaller radius than a radius of the guide surface with respect to the axis line as a center, and faces inward in the radial direction with respect to the internal teeth.

In this case, the auxiliary guide surface is located at the same height as the internal teeth in the thickness direction of the main plate, but is formed with a smaller radius than the guide surface in the rotation guide portion. Therefore, the internal teeth of the display wheel and the auxiliary guide surface can be brought into a non-contact state in a state where the internal teeth are in contact with the guide surface in the rotation guide portion. On the other hand, when the display wheel rotates, if the display wheel is excessively rocked in the planar direction of the main plate, or the like, the display wheel may be undesirably displaced so that the internal teeth are separated from the guide surface. However, since the auxiliary guide portions are arranged side by side in the circumferential direction with respect to the rotation guide portions, the internal teeth can be brought into contact with the auxiliary guide surfaces, and the unintended displacement of the display wheel can be restricted. Further, since the internal teeth can be brought into sliding contact with the auxiliary guide surface, the display wheel can be appropriately rotationally guided. By providing the auxiliary guide portion in this manner, the display wheel can be appropriately rotated while suppressing excessive behavior such as movement of the display wheel in the planar direction of the main plate. Further, even when an unexpected external force acts on the display wheel, the display wheel can be restrained from excessively moving in the planar direction of the main plate by the auxiliary guide portion.

(5) The auxiliary guide portion may be integrally formed with the main plate.

In this case, for example, when the main plate is formed in a predetermined shape by cutting or the like, the auxiliary guide portions can be formed simultaneously, and therefore, the number of parts can be reduced, and the cost reduction or the like can be facilitated.

(6) The rotation guide portion may include a protruding piece that protrudes outward in the radial direction so as to overlap the internal teeth in the thickness direction of the main plate, and may correct the position of the display wheel in the thickness direction.

In this case, since the position correction of the display wheel in the thickness direction of the main plate can be performed by the protruding piece, for example, a clip member for pressing the display wheel or the like can be omitted or the size thereof can be reduced. Therefore, space saving and the like can be easily achieved.

(7) An information display mechanism according to the present invention is characterized by comprising: the guide mechanism; the display wheel; a turning wheel having turning claws capable of meshing with the internal teeth, the turning wheel being configured to rotate around the axis line at a predetermined cycle; and a correcting member for correcting a rotational position of the display wheel by a correcting force biasing the display wheel to the outside in the radial direction.

According to the information display mechanism of the present invention, for example, if a predetermined time comes, the rotating pawl in the rotating wheel engages with one of the internal teeth. Accordingly, the power can be transmitted to the display wheel via the rotating claw with the rotation of the rotating wheel, and the display wheel can be rotated around the axis line with a predetermined cycle. Further, since the display wheel receives the correction force from the correction member toward the outside in the radial direction, the display wheel is positioned in a state in which the internal teeth are in contact with the guide surface in the rotation guide portion. Thereby, the display wheel is positioned in the plane direction of the main plate, and the rotational position is corrected. Therefore, in the non-rotation (stationary state), the display wheel can be stably positioned with less wobbling, and smooth rotation of the display wheel can be achieved. Therefore, the information can be displayed with excellent accuracy by the display wheel.

(8) The rotation guide unit may be configured to: the guide surface is located on at least the opposite side of the axis line with respect to the correction member in the radial direction.

In this case, the display wheel is biased outward in the radial direction due to the bias of the correction member, so that the internal teeth can be reliably brought into contact with the guide surface of the rotation guide portion. Therefore, for example, the display wheel can be positioned in a state where the display wheel is supported at multiple points, and the display wheel can be positioned stably with less further shaking when not rotated (when in a stationary state).

(9) The display wheel may be a date wheel for displaying a date character as the information.

In this case, since the date wheel can be stably and precisely rotatably guided over a long period of time by the guide mechanism, for example, the date characters can be displayed with excellent precision without being deviated from the window hole of the dial.

(10) The movement according to the present invention is characterized by comprising the information display means.

(11) The timepiece according to the present invention includes the movement.

In this case, since the guide mechanism is provided, the display wheel for displaying information can be stably and precisely rotatably guided over a long period of time, and the display wheel can be used as a movement and a timepiece having high quality and high performance.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the display wheel for displaying information can be stably and accurately rotated over a long period of time, and the number of parts can be reduced, thereby reducing the cost and improving the maintainability.

Drawings

Fig. 1 is a view showing a first embodiment of the present invention, and is an external view of a timepiece.

Fig. 2 is a plan view of the movement shown in fig. 1, as seen from the back side.

Fig. 3 is a plan view of a state in which the back side object pressing plate is detached from the movement shown in fig. 2.

Fig. 4 is a longitudinal section of the movement along the line A-A shown in fig. 3.

Fig. 5 is a longitudinal sectional view of the periphery of the hour wheel shown in fig. 3.

Fig. 6 is a perspective view of the movement shown in fig. 3.

Fig. 7 is a plan view of the date wheel shown in fig. 3.

Fig. 8 is a plan view of the periphery of the day changing wheel shown in fig. 3.

Fig. 9 is a plan view of the sun gear shown in fig. 8.

Fig. 10 is a plan view of the sun gear shown in fig. 9 as seen from below (the case rear cover side).

Fig. 11 is a plan view of the sun gear showing a state in which the spring pressing plate is detached from the state shown in fig. 10.

Fig. 12 is a longitudinal sectional view of the sun gear along the line B-B shown in fig. 10.

Fig. 13 is a perspective view showing a state in which the date wheel guide plate is detached from the state shown in fig. 6.

Fig. 14 is a perspective view of the date wheel guide plate shown in fig. 6.

Fig. 15 is a plan view showing a state in which the day changing wheel rotates counterclockwise from the state shown in fig. 8, and the engagement between the day changing wheel and the day changing regulating spring is released.

Fig. 16 is a plan view showing a state in which the date wheel is instantaneously rotated in the counterclockwise direction by the day wheel from the state shown in fig. 15.

Fig. 17 is a perspective view showing a modification of the date wheel guide plate shown in fig. 14.

Fig. 18 is a plan view showing a movement according to a second embodiment of the present invention.

Fig. 19 is a plan view showing a movement according to a third embodiment of the present invention.

Fig. 20 is a longitudinal section of the cartridge along the line C-C shown in fig. 19.

Detailed Description

(first embodiment)

A first embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a mechanical timepiece having a three-hand center second hand direct structure in which an hour hand, a minute hand, and a second hand are disposed in the center of a movement is illustrated as an example of the timepiece. In the drawings of the present embodiment, for the sake of easy viewing of the drawings, a part of the timepiece component may be omitted, and the timepiece component may be simplified and illustrated.

In general, a mechanical body including a driving portion of a timepiece is referred to as a "movement". The following states are called "finished" of the timepiece: the dial and the needle are arranged on the movement and put into a watch case to form the finished product. The side of the glass of the case of the timepiece (i.e., the side where the dial is present) among the two sides of the main plate constituting the base plate of the timepiece is referred to as the "back side" of the movement. In addition, the side of the main plate on which the case back cover of the timepiece case exists (i.e., the side opposite to the dial) is referred to as the "watch side" of the movement. In the present embodiment, the direction from the case rear cover (front side) toward the dial is described as the upper side, and the opposite side (back side) is described as the lower side. Therefore, the thickness direction of the main plate is up and down.

As shown in fig. 1, the timepiece 1 according to the present embodiment includes, in a timepiece case 3 composed of a case back cover and glass 2, not shown: movement 10; a dial 4 having a scale or the like indicating at least information about hours; and a hand including an hour hand 5 representing an hour, a minute hand 6 representing a minute, and a second hand 7 representing a second. A date window 8, which is clearly indicated by a date character 91 displayed on a date wheel 90 described later, is opened to the dial 4. Thus, the date can be confirmed in addition to the time.

As shown in fig. 2 to 4, the deck 10 has a main board 11 constituting a substrate of the deck 10. On the back side (i.e., above) of the main board 11, at least: a rear wheel train 12 including a minute wheel 40, a straddle wheel 60 and an hour wheel 50; calendar mechanism (information display mechanism according to the present invention) 13; and a date correcting mechanism 14. The rear wheel train 12 is pivotally supported between the main plate 11 and a rear object pressing plate 15 disposed on the rear side of the main plate 11. The back side object pressing plate 15 is disposed inside a date wheel 90 described later. The dial 4 is disposed on the back side of the back side object pressing plate 15 so as to be visually identifiable by the glass 2.

At least the front side (i.e., lower side) of the main plate 11, as shown in fig. 5, a front side train 16, an escapement 17 for controlling the rotation of the front side train 16, and a speed governor, not shown, for regulating the speed of the escapement 17 are disposed.

(front side wheel train, back side wheel train)

The front wheel train 16 is disposed between the main plate 11 and a wheel train bridge 18 disposed on the front side of the main plate 11, and rotates by an output torque generated by unwinding a spring, not shown, to perform the functions of moving the hour hand 5, minute hand 6, and second hand 7. The front wheel train 16 mainly includes a barrel wheel, a second wheel, a third wheel 20, and a fourth wheel 30 for accommodating the spring. In the drawings, the cartridge wheel and the second wheel are not shown.

The barrel wheel can rotate by an elastic restoring force (power) accompanying the unwinding of the spring. The spring is wound up via a stem 19 shown in fig. 1. The stem 19 is rotatably fitted into a stem guide hole, not shown, formed in the main plate 11. The stem 19a shown in fig. 1 is coupled to the stem 19. Thereby, the stem 19 can be rotated via the stem 19 a.

The stem 19 is positioned in the axial direction by a switching device not shown, such as a setting lever, a clutch lever, and a clutch lever spring. A not-shown standing wheel which is rotatable relative to the stem 19 and is not movable in the axial direction is attached to the guide shaft portion of the stem 19. A clutch wheel, not shown, which is not rotatable relative to the stem 19 and movable in the axial direction, is attached to a portion of the stem 19 on the tip end side than the standing wheel.

For example, when stem 19 is disposed at a stem position (0-stage position) closest to movement 10 in the axial direction, the standing wheel and the clutch wheel can be engaged with each other. Therefore, by rotating the stem 19 via the stem 19a in this state, the standing wheel can be rotated about an axis coaxial with the stem 19 via the clutch wheel. Then, the standing wheel rotates, whereby the spring can be wound up via a ratchet wheel, not shown.

Further, when the stem 19 is rotated from the 0-stage position, for example, in a state of being pulled out by 1 stage, date correction can be performed, and when it is rotated in a state of being pulled out by 2 stage, time correction can be performed. This will be described later.

The second wheel is rotatable in association with the rotation of the drum wheel rotated by the power generated by unwinding the spring. The second wheel includes a second pinion to which power is transmitted from the case wheel side, and a second gear engaged with a third pinion 21 described later.

As shown in fig. 5, the lower tenon portion of the third wheel 20 is supported by the drill bearing shaft held by the train wheel bridge 18, and the upper tenon portion is supported by the drill bearing shaft held by the main plate 11, and the third wheel 20 is rotatable about the first axis O1. The third wheel 20 includes a third pinion 21 engaged with the second gear, and a third gear 22 engaged with a fourth pinion 32 described later. Thereby, the third wheel 20 can rotate around the first axis O1 with the rotation of the second wheel.

The fourth wheel 30 is disposed coaxially with the central axis (axis according to the present invention) C of the main plate 11 and rotatable about the central axis C in a state of being disposed in the cylindrical portion 25 held by the main plate 11. Wheel number four 30 has: an axle 31; a fourth pinion 32 engaged with the third gear 22; and a fourth gear 33. The wheel shaft 31 is rotatably supported by a bearing provided in the cylindrical portion 25. In the illustrated example, the wheel shaft 31 is rotatably supported by two bearings arranged at intervals in the up-down direction. The lower tenon portion of the wheel shaft 31 is supported by a bearing shaft such as a hole drill held by the train wheel bridge 18. Thereby, the fourth wheel 30 can rotate around the central axis C with the rotation of the third wheel 20.

The upper end of the wheel shaft 31 protrudes upward from the dial 4 and protrudes upward from the minute wheel 40 and the hour wheel 50. A second hand 7 is attached to the upper end portion of the wheel shaft 31. This is a direct drive system in which the second hand 7 is directly driven by the rotation of the fourth wheel 30. Further, the second hand 7 rotates at a rotation speed regulated by the escapement 17 and the speed regulator, that is, one rotation for 1 minute.

The minute wheel 40 constituting the backside wheel train 12 is disposed coaxially with the central axis C on the backside (upper) of the main plate 11, and is rotatable about the central axis C. The minute wheel 40 has: a cylindrical minute wheel body 41 surrounding the cylindrical portion 25; a minute wheel gear 42 which is combined with the lower end portion of the minute wheel main body 41 and is engaged with the third pinion 21; and a minute wheel pinion 43 formed at a portion of the minute wheel body 41 between the minute wheel gear 42 and the hour wheel 50. Thereby, the cannon-pinion 40 can rotate around the central axis C with the rotation of the third wheel 20.

Specifically, the minute wheel 40 is arranged inside a minute wheel main body 41 described later on the inside of a hour wheel main body 51 described later on the condition that a minute wheel pinion 43 is superimposed on a hour wheel gear 52 described later on. Thereby, the minute wheel 40 is positioned in the up-down direction by the hour wheel 50, and is guided by the hour wheel 50 while being able to rotate stably about the central axis C.

The minute wheel main body 41 and the minute wheel gear 42 are combined in a state of maintaining a predetermined pressing force (friction force). Therefore, for example, when a relative rotational force exceeding the pressure contact force (friction force) acts between the minute wheel body 41 and the minute wheel gear 42 at the time of time calibration or the like, the minute wheel gear 42 may slip with respect to the minute wheel body 41.

The upper end of the minute wheel main body 41 protrudes upward from the hour wheel 50 and is disposed below the upper end of the wheel shaft 31 in the fourth wheel 30. A minute hand 6 is attached to the upper end of the minute wheel main body 41. Therefore, the minute hand 6 is located closer to the dial 4 than the second hand 7 attached to the fourth wheel 30. Thus, the minute hand 6 can be directly moved by the rotation of the minute wheel 40. Further, the minute hand 6 rotates at a rotation speed regulated by the escapement 17 and the speed regulator, i.e., one rotation for 1 hour.

The hour wheel 50 constituting the back wheel train 12 is disposed coaxially with the central axis C on the back side of the main plate 11 and rotatable about the central axis C. The hour wheel 50 includes: a cylindrical hour wheel main body 51 surrounding the minute wheel main body 41; and a hour wheel gear 52 integrally formed at a lower end portion of the hour wheel main body 51 and engaged with a jumper pinion 61 described later.

As shown in fig. 3 and 4, the lower tenon portion of the straddle 60 is supported by the bearing shaft of the hole drill held by the main plate 11, and the upper tenon portion is supported by the bearing shaft of the hole drill held by the back side object pressing plate 15, and the straddle 60 is rotatable about the second axis O2. The idler 60 includes an idler pinion 61 engaged with the hour wheel gear 52 and an idler gear 62 engaged with the minute wheel pinion 43 of the minute wheel 40. Thus, the straddle wheel 60 is engaged to both the minute wheel 40 and the hour wheel 50.

As a result, the hour wheel 50 can rotate around the central axis C with the rotation of the minute wheel 40 and the straddle wheel 60. The upper end of the hour wheel body 51 protrudes upward from the dial 4, and is disposed below the upper end of the minute wheel body 41. An hour hand 5 is attached to the upper end of the hour wheel main body 51. Therefore, the hour hand 5 is located closer to the dial 4 than the minute hand 6 attached to the minute wheel 40. Thereby, the hour hand 5 can be directly set by the rotation of the hour wheel 50. In addition, the hour hand 5 rotates at a rotational speed regulated by the escapement 17 and the governor, i.e., one revolution for 12 hours.

(escapement, speed governor)

As shown in fig. 5, the escapement 17 includes an escape wheel 80 that rotates around the fourth axis O4 in association with the rotation of the fourth wheel 30, and an escapement fork, not shown, that regularly rotates the escape wheel 80, and controls the timepiece side train 16 with regular vibrations from a balance spring system, not shown. In the present embodiment, the following is taken as an example: between escape wheel 80 and escape wheel 30, an escape intermediate wheel 70 is disposed that rotates about a third axis O3, and the rotational force of escape wheel 30 is transmitted to escape wheel 80 via escape intermediate wheel 70.

However, the escapement intermediate wheel 70 is not necessarily required for the escapement 17, and may not be provided, since it only plays a role of mainly adjusting the speed increasing ratio of the timepiece wheel system 16. In this case, for example, the fourth wheel 30 may be configured to directly engage with the escape wheel 80. Further, a plurality of intermediate escape wheels including the intermediate escape wheel 70 may be disposed between the escape wheel 80 and the fourth wheel 30, and the rotational force of the fourth wheel 30 may be transmitted to the escape wheel 80 via the plurality of intermediate escape wheels.

The lower tenon portion of the escape intermediate wheel 70 is supported by a bearing shaft such as a drill held by the train wheel bridge 18, and the upper tenon portion is supported by a bearing shaft such as a drill held by the main plate 11, so that the escape intermediate wheel 70 can rotate about the third axis O3. The escape pinion 70 includes an escape pinion 71 engaged with the fourth gear 33 and an escape pinion 72. Thereby, the escape intermediate wheel 70 can rotate around the third axis O3 with the rotation of the fourth wheel 30.

The lower tenon portion of the escape wheel 80 is supported by a drill-like bearing shaft held by the escape plate 85, and the upper tenon portion is supported by a drill-like bearing shaft held by the main plate 11, so that the escape wheel 80 can rotate about the fourth axis O4. The escape wheel 80 includes an escape pinion 81 engaged with the escape pinion 72, and an escape pinion 82 having a plurality of escape teeth. The pallet has an entry pallet and an exit pallet which can be engaged with and disengaged from the escape tooth.

The governor includes a balance spring system that mainly uses a balance spring (not shown) as a power source and reciprocates (rotates in a forward and reverse direction) at a constant amplitude (a pivot angle) according to the output torque of the spring.

The rotation of the timepiece gear train 16 and the back gear train 12 can be controlled by the escapement 17 and the speed governor configured as described above, and the second hand 7, the minute hand 6, and the hour hand 5 can be properly moved as described above to trace the correct time.

(calendar mechanism)

As shown in fig. 3 and 6, the calendar mechanism 13 is disposed on the back side (upper side) of the main plate 11. The calendar mechanism 13 includes: a date wheel (display wheel according to the present invention) 90; a date changing wheel (wheel according to the present invention) 100 rotatably disposed about a fifth axis O5, and configured to rotate (date feed) the date wheel 90 about a central axis C at a predetermined cycle; a day changing wheel train 110 for rotating the day changing wheel 100 with the rotation of the hour wheel 50; a date jumper (correction means) 120 for correcting the rotational position of the date wheel 90; and a guide mechanism 130 that rotationally guides the date wheel 90 around the center axis C.

The date wheel 90 is an annular member rotatably disposed on the upper surface of the main plate 11, and on the upper surface thereof, date characters (date information) 91 indicating 1 to 31 date are sequentially and clearly indicated in the circumferential direction. The method for specifying the date character 91 includes, for example, printing, engraving, and seal attachment, but is not particularly limited.

The date wheel 90 is rotatable in a counterclockwise direction (hereinafter, simply referred to as a counterclockwise direction) as indicated by an arrow K1 shown in fig. 3 when viewed from above (dial 4 side). Accordingly, the date wheel 90 rotates in the counterclockwise direction, thereby enabling date feeding. The rotation direction opposite to the rotation direction of the date wheel 90 is referred to as a clockwise rotation direction (hereinafter, simply referred to as a clockwise direction). However, the rotation direction of the date wheel 90 is not limited to the above, and for example, the date wheel 90 may be rotated clockwise to perform date feeding.

The plurality of internal teeth 92 are formed at equal intervals in the circumferential direction over the entire circumference at the inner peripheral edge portion of the date wheel 90. The number of internal teeth 92 is 31 teeth. Accordingly, by rotating the date wheel 90 in accordance with 1 tooth of the internal teeth 92, the date character 91 displayed through the date window 8 can be fed in accordance with 1 day. However, the number of the internal teeth 92 is not limited to 31 teeth, and may be changed to 62 teeth, for example, as appropriate. In this case, the rotation amount of the date wheel 90 corresponding to the 1-day date may be changed appropriately according to the number of the internal teeth 92.

As shown in fig. 6, the inner peripheral edge portion of the date wheel 90 is formed in a stepwise manner so as to be located on the main plate 11 side than the other portions of the date wheel 90. Therefore, the plurality of internal teeth 92 are located slightly more on the main plate 11 side than the other portions in the date wheel 90. Each of the internal teeth 92 includes a first inclined surface 92a facing in the counterclockwise direction, which is the rotation direction of the date wheel 90, and a second inclined surface 92b facing in the clockwise direction, and is a triangular tooth portion protruding inward in the radial direction.

The date wheel 90 configured as described above is superposed on the main plate 11 with the center axis C of the main plate 11 as shown in fig. 7 at a stage before the biasing force from the date jumper 120 described later is applied thereto. Therefore, the rotation locus M of the tooth tips of the plurality of internal teeth 92, which is drawn by the rotation of the date wheel 90 around the central axis C, becomes a virtual circle of the radius R1 centered around the central axis C. In fig. 7, the date character 91 is not shown.

In the present embodiment, the calendar mechanism 13 is configured to: at a predetermined time (for example, around 0 midnight), rotation of the date wheel 90 is started by changing the date wheel 100, and for example, after a predetermined time has elapsed, the date wheel 90 is instantaneously rotated in accordance with the date of 1 day (that is, in accordance with 1 tooth of the internal teeth 92).

As shown in fig. 3 and 6, the day changing wheel 100 is rotatable about the fifth axis O5 based on the power (rotational force) from the hour wheel 50 transmitted via the day changing wheel train 110. Specifically, the day changing wheel 100 is configured to: the rotation is counterclockwise as indicated by an arrow K2 shown in fig. 3 about the fifth axis O5, and is decelerated by the day changing gear train 110, thereby rotating for 24 hours once.

As shown in fig. 6 and 8, the day changing wheel 100 includes: the sun gear 200 rotates one turn in the counterclockwise direction about the fifth axis O5 within 24 hours in synchronization with the rotation of the hour wheel 50; a sun changing claw unit 210 rotatably provided about a fifth axis O5 with respect to the sun changing gear 200; and a sun changing operation spring 220 (see fig. 10) for applying torque between the sun changing gear 200 and the sun changing pawl unit 210. In the following description, the direction in which day wheel 100 rotates (i.e., counterclockwise) during normal needle running of movement 10 is sometimes referred to as the forward direction.

As shown in fig. 8 to 11, the sun gear 200 includes: a gear main body 201 engaged with a second sun gear 116 (see fig. 4); and a first spring pin 202A, a second spring pin 202B, and a restriction release pin 203, protruding downward (case back cover side) from the gear main body 201.

Fig. 8 and 9 are plan views of the day changing wheel 100 viewed from above (dial side), and fig. 10 and 11 are plan views of the day changing wheel 100 viewed from below (case rear cover side). The gear main body 201 is rotatably provided around a fifth axis O5, and has a through hole formed in a central portion thereof through which a sun gear shaft 230 to be described later is inserted.

As shown in fig. 10 and 11, the first spring pin 202A and the second spring pin 202B are supported by the gear main body 201 at positions eccentric with respect to the fifth axis O5, respectively. The first spring pins 202A and the second spring pins 202B are arranged side by side in the circumferential direction about the fifth axis O5. The first spring pin 202A is positioned in the forward rotation direction more than the second spring pin 202B. In fig. 10 and 11, the sun gear 100 is seen from below (from the case rear cover side), and therefore the forward rotation direction of the sun gear 100 is opposite to that of fig. 8 and 9.

In the present embodiment, since the first spring pin 202A and the second spring pin 202B are formed in the same manner as each other, when one of the first spring pin 202A and the second spring pin 202B is not specifically designated, it is simply referred to as the spring pin 202.

The spring pin 202 is formed in a cross-sectional circular shape. The spring pin 202 includes: a cylindrical portion 205 protruding downward from the gear main body 201; and a flange portion 206 extending outward in the radial direction of the cylindrical portion 205 from the lower end portion of the cylindrical portion 205. Further, the flange portion 206 is located below the lower surface of the gear main body 201 with a space therebetween.

The restriction release pin 203 is disposed at an interval in the normal rotation direction with respect to the first spring pin 202A and the second spring pin 202B. As shown in fig. 12, the restriction release pin 203 includes: a shaft portion 207 fixed to the gear main body 201; and a flange portion 208 extending outward in the radial direction of the shaft portion 207 from an intermediate portion in the up-down direction of the shaft portion 207. The upper end of the shaft 207 is press-fitted into a through hole formed in the gear body 201. The flange 208 is located below the lower surface of the gear main body 201 with a space therebetween, and is configured to avoid interference with a day changing operation spring 220 described later.

As shown in fig. 9 and 12, the day changing pawl unit 210 includes a day changing shaft 230, a day changing pawl 240, a day changing pawl spring 250, a pawl presser plate 260, and a spring presser plate 270.

As shown in fig. 12, the sun-changing shaft 230 includes: a center tube 231 disposed on the same shaft as the fifth axis O5; and a claw holder 232 extending from the center tube 231. The center tube 231 is inserted into a through hole penetrating the gear main body 201 so as to be rotatable about the fifth axis O5, and protrudes upward and downward with respect to the gear main body 201. The pawl 232 is disposed to overlap the upper surface of the gear main body 201. The claw seat 232 protrudes outward in the radial direction from the center 231, and is formed in a ring shape extending over the entire circumference in the circumferential direction.

As shown in fig. 9, the date changing claw 240 is disposed so as to overlap the claw seat 232 in a plan view, and is disposed along the outer peripheral edge of the claw seat 232. The day changing pawl 240 is rotatably supported by the pawl seat 232 at an intermediate portion in the circumferential direction about the fifth axis O5. Specifically, the day changing pawl 240 is rotatably supported by a support shaft protruding upward from the pawl seat 232. The day changing claw 240 includes: a pawl main body 241 extending in a normal rotation direction (counterclockwise direction) from a rotation center of the support shaft; and an arm 242 extending from the rotation center in a direction opposite to the normal rotation direction (clockwise direction).

The arm 242 is formed so as to be able to contact the outer peripheral surface of the center tube 231 of the sun exchange shaft 230. The distal end portion of the claw body 241 is formed so as to protrude radially outward from the claw seat 232 in a plan view. The pawl body 241 is provided with an engagement surface 241a facing in the forward rotation direction.

When the date changing pawl unit 210 rotates in the forward direction, the pawl main body 241 is disposed at a position where the engagement surface 241a can contact the second inclined surface 92b of the internal teeth 92 of the date indicator 90 (see fig. 6). When the date changing pawl unit 210 rotates in the direction opposite to the normal rotation direction (clockwise direction), the pawl main body 241 is brought into contact with the first inclined surface 92a of the internal teeth 92 of the date wheel 90, and can be displaced inward in the radial direction about the rotation center of the support shaft.

The day changing pawl spring 250 is disposed so as to overlap the pawl seat 232 in a plan view and biases the day changing pawl 240. The day changing pawl spring 250 includes: a base 251 fixed to the claw holder 232; and a spring body 252 extending from the base 251 in the forward rotation direction of the day changing wheel 100 and contacting the arm 242 of the day changing pawl 240. The base 251 is supported by a support shaft protruding upward from the claw seat 232. The spring body 252 contacts the arm 242 of the day changing pawl 240 from the outside in the radial direction, and presses the arm 242 to the inside in the radial direction by the elastic restoring force. Thereby, the date changing claw 240 is biased in a direction in which the arm 242 contacts the outer peripheral surface of the center tube 231 of the date changing shaft 230. That is, the date changing claw 240 is biased in a direction protruding radially outward from the claw seat 232 in a plan view along the distal end portion of the claw body 241.

As shown in fig. 9 and 12, the claw pressing plate 260 restricts upward movement of the day changing claw 240 and the day changing claw spring 250. The claw pressing plate 260 is disposed on the opposite side of the claw seat 232 with the day changing claw 240 and the day changing claw spring 250 interposed therebetween. The claw pressing plate 260 is formed in a disk shape having a diameter substantially equal to the outer diameter of the claw seat 232, and is disposed coaxially with the claw seat 232. A through hole into which the upper end portion of the center tube 231 of the sun gear replacement shaft 230 is fitted is formed in the center of the claw pressing plate 260. Thereby, the claw pressing plate 260 is integrally combined with the sun gear shaft 230. Further, in the claw pressing plate 260, a through hole is formed which avoids interference with the respective support shafts supporting the day changing claw 240 and the day changing claw spring 250.

As shown in fig. 10 and 12, the spring presser 270 is disposed on the same shaft as the fifth axis O5 below the gear body 201 of the sun gear 200, and holds the sun gear working spring 220 between the gear body 201 and the sun gear working spring. The spring presser 270 is formed in a disk shape having a smaller diameter than the gear main body 201, and has a through hole formed at the center thereof, into which the lower end portion of the center tube 231 of the sun gear shaft 230 is fitted. Thereby, the spring pressing plate 270 is integrally combined with the sun gear shaft 230.

The spring presser 270 is formed with a pin guide hole 271 and a restraining spring engaging portion 272. The lower end portion of the shaft portion 207 of the restriction cancellation pin 203 in the sun gear 200 is inserted into the pin guide hole 271. The pin guide hole 271 extends in an arc shape centering on the fifth axis O5 so as to allow displacement of the restriction release pin 203 about the fifth axis O5. The pin guide hole 271 includes a first peripheral end 271a provided in the forward rotation direction and a second peripheral end 271b provided in a direction opposite to the forward rotation direction of the day changing wheel 100. The lower end portion of the shaft portion 207 of the restriction release pin 203 is located at the second peripheral end 271b of the pin guide hole 271.

The regulating spring engaging portion 272 is a notch formed on the outer peripheral surface of the spring pressing plate 270, and is formed in the vicinity of the first peripheral end 271a of the pin guide hole 271. The regulating spring engaging portion 272 includes a spring engaging surface 272a facing the forward rotation direction of the sun gear 100. In a state where the lower end portion of the shaft portion 207 in the restriction cancellation pin 203 is located at the first peripheral end 271a of the pin guide hole 271, the spring engagement surface 272a is provided at a position overlapping the flange portion 208 of the restriction cancellation pin 203 in a plan view (see fig. 15).

As shown in fig. 10 to 12, the date changing operation spring 220 is disposed between the gear main body 201 of the date changing gear 200 and the spring pressing plate 270 of the date changing pawl unit 210. The day change operation spring 220 is a scroll spring made of a metal such as iron or nickel, or a nonmetal such as silicon. The daily working spring 220 is wound up by rotating the outer end portion and the inner end portion relatively to wind up in a reduced diameter manner. The wound-up daily-change operation spring 220 generates a torque between the outer end portion and the inner end portion by elastic deformation.

In the following description about the shape of the day changing operation spring 220, unless otherwise specified, it is assumed that the state in which the winding amount of the day changing operation spring 220 is the smallest among all the states of the day changing wheel 100 at the time of operation of the movement 10.

The daily working spring 220 includes a spring body 221 formed in a spiral shape, a spring fixing portion 222 located at an inner end portion, and a spring engaging portion 223 located at an outer end portion. The spring body 221 is formed in a spiral shape extending along an archimedes curve centering on the fifth axis O5 in a plan view, for example. Further, the spring main body 221 extends from the spring fixing portion 222 toward the spring engaging portion 223 in the normal rotation direction.

The spring fixing portion 222 is integrally formed at the inner end of the spring body 221, and is formed in a circular ring shape and is disposed coaxially with the fifth axis O5. The spring fixing portion 222 is externally inserted into the center pipe 231 of the date changing shaft 230, and is integrally combined with the date changing shaft 230.

The spring engaging portion 223 is integrally formed at an outer end portion of the spring main body 221. The spring engagement portion 223 is disposed radially outward of the outer peripheral portion of the spring body 221 at a distance from the restriction release pin 203 in the circumferential direction. The spring engaging portion 223 extends from the outer end portion of the spring main body 221 in the forward rotation direction. The spring engagement portion 223 is engaged with the first spring pin 202A and the second spring pin 202B of the sun gear 200. Thus, the spring engagement portion 223 is restricted from being displaced in the direction opposite to the normal rotation direction with respect to the sun gear 200.

Further, a pair of through holes 224 into which the first spring pins 202A and the second spring pins 202B are respectively inserted are formed in the spring engaging portion 223. These through holes 224 include: a narrow width portion 224a, and the cylindrical portion 205 of the spring pin 202 is located at the narrow width portion 224a; and a wide width portion 224b connected to the narrow width portion 224a in the circumferential direction, and formed larger than the narrow width portion 224a in the radial direction. The width of the narrow width portion 224a in the radial direction is the same diameter as the outer diameter of the cylindrical portion 205 of the spring pin 202, and can hold the cylindrical portion 205. The wide portion 224b is formed larger than the spring pin 202 in plan view, and allows the flange portion 206 of the spring pin 202 to pass in the up-down direction.

Accordingly, in a state where the spring pin 202 is inserted into the wide portion 224b of the through hole 224, the spring pin 202 is slid and moved in a direction opposite to the normal rotation direction with respect to the sun gear 200, and the spring pin 202 is positioned at the narrow portion 224a, whereby the spring pin 202 can be engaged with the spring engaging portion 223.

The sun gear change operation spring 220 is wound up as the spring engagement portion 223 moves in the forward rotation direction of the sun gear 100 relative to the spring fixing portion 222, and the spring fixing portion 222 generates a torque in the forward rotation direction. Thereby, the day changing operation spring 220 can bias the day changing pawl unit 210 in the forward rotation direction.

The sun gear 100 configured as described above is assembled such that a support pin, not shown, provided on the main plate 11 is inserted into the inside of the center tube 231, and the coupling screw 280 shown in fig. 6 is screwed to the support pin so as to be positioned in the up-down direction of the main plate 11 in a rotatable state about the fifth axis O5. As shown in fig. 8, the day changing regulating spring 290 is attached to the main plate 11 so as to be adjacent to the day changing wheel 100. In the drawings other than fig. 8, the day changing regulating spring 290 is appropriately omitted.

As shown in fig. 8, the day changing regulating spring 290 is formed in a cantilever shape. In the day changing regulating spring 290, the base end portion 291 is fixed to the main plate 11, and the tip end portion 292 is capable of sliding contact with the outer peripheral surface of the spring presser 270. The tip end 292 of the day changing regulating spring 290 faces in a clockwise direction opposite to the rotation direction of the date wheel 90 and the day changing wheel 100. Thereby, the tip end portion 292 of the day changing regulating spring 290 can be engaged with the spring engagement surface 272a of the regulating spring engagement portion 272 in association with the rotation of the day changing wheel 100. When the tip end portion 292 is engaged with the regulating spring engaging portion 272, the day changing regulating spring 290 is disposed so that the flange portion 208 of the regulating release pin 203 of the day changing gear 200 can contact the tip end portion 292.

As shown in fig. 4 and 6, the sun gear train 110 includes: a first day-changing intermediate wheel 111 that rotates about a sixth axis O6 based on the rotation of the hour wheel 50; and a second day changing intermediate wheel 115 that rotates around a seventh axis O7 based on the rotation of the first day changing intermediate wheel 111. These first day changing intermediate wheel 111 and second day changing intermediate wheel 115 are disposed between the main plate 11 and the back side object pressing plate 15, and are rotatably supported by the shaft through the main plate 11.

The first day changing intermediate wheel 111 includes a first day changing intermediate gear 112 engaged with the hour wheel gear 52 of the hour wheel 50. The second day changing intermediate wheel 115 includes: a second day change intermediate gear 116 engaged with the first day change intermediate gear 112; and a second sun gear intermediate pinion 117 engaged with the sun gear 200 of the sun gear 100. Accordingly, the first day changing intermediate wheel 111 and the second day changing intermediate wheel 115 can be rotated with the rotation of the hour wheel 50, and as described above, the day changing wheel 100 can be rotated around the fifth axis O5 in the counterclockwise direction.

The sun gear train 110 is constituted by the first sun gear 111 and the second sun gear 115, but the present invention is not limited to this, and the number of intermediate gears may be increased or decreased, for example. The sun gear train 110 is not necessarily a component, and the sun gear train 110 may not be provided. In this case, the positional relationship between the day changing wheel 100 and the hour wheel 50 may be adjusted so that the day changing gear 101 is directly engaged with the hour wheel 50.

As shown in fig. 3, 6 and 8, the date jumper 120 is a timepiece component that corrects the rotational position of the date wheel 90 and assists the rotation of the date wheel 90, and is rotatably combined with respect to a support shaft provided to the main plate 11. The date jumper 120 includes: a base portion 121 having an insertion through hole through which the support shaft is inserted; and a date arm 122 connected to the base portion 121, and a tip end portion becomes a free end; and a date jumper spring portion 124 connected to the base portion 121.

The date jumper spring portion 124 is, for example, a leaf spring formed in a U shape in a plan view, and is disposed below the date wheel 90. The tip end 124a of the date jumper spring 124 engages with a projection formed on the main plate 11 (see fig. 3), and the tip end of the date arm 122 is biased outward in the radial direction about the support shaft by an elastic restoring force. This makes it possible to bias the date wheel 90 with a correction force that is outward in the radial direction by the tip end portion of the date arm 122.

A jump stopper 123 for correcting the rotational position of the date indicator 90 is formed at the distal end portion of the date arm 122. As described above, since the distal end portion of the date arm 122 is biased outward in the radial direction by the date jumper spring portion 124, the stopper portion 123 can be pressed toward the date wheel 90, and the stopper portion 123 can be engaged with the inner teeth 92 of the date wheel 90.

Specifically, the jump stopper 123 engages with the inner teeth 92 and biases the date wheel 90 outward in the radial direction in a state where two inner teeth 92 adjacent in the circumferential direction are interposed therebetween. The jump stopper 123 includes a first engagement surface 123a facing the counterclockwise direction as the rotation direction of the date wheel 90 and a second engagement surface 123b facing the clockwise direction, and is formed in a triangular shape protruding outward in the radial direction. Therefore, the jump stopper 123 can enter between the internal teeth 92 in the following manner: the second engagement surface 123b engages with the first inclined surface 92a of the internal tooth 92 on the clockwise side than the jump stopper 123, and the first engagement surface 123a engages with the second inclined surface 92b or the apex of the internal tooth 92 with respect to the internal tooth 92 on the counterclockwise side than the jump stopper 123. The date wheel 90 corrects the rotational position by the date jumper 120 thus constituted.

However, if the date wheel 90 is gradually pushed in the counterclockwise direction by the date changing pawl 103, the rotation slightly starts in the counterclockwise direction against the biasing force of the date jumper 120. Accordingly, the internal teeth 92 of the second engagement surface 123b engaged with the stopper portion 123 elastically deform the date jumper spring portion 124 so as to push up the date arm portion 122 toward the inside in the radial direction, and at the same time, move in the counterclockwise direction so as to slide on the second engagement surface 123 b. Then, by further pushing from the date changing pawl 103, the internal teeth 92 pass over the second engagement surface 123b of the click-stop portion 123, and if the vertex portion of the click-stop portion 123 is reached, the click-stop of the date jumper 120 is released.

As a result, as described above, the date wheel 90 can be fed with the date changing claw 103. Further, since the date jumper spring portion 124 elastically returns to deform in association with the rotation of the date wheel 90, the date arm portion 122 can be displaced to return to the outside in the radial direction, and the first engagement surface 123a of the stopper portion 123 can push the second inclined surface 92b of the internal tooth 92 in the counterclockwise direction with assistance. This can assist the rotation of the date wheel 90.

As a result, the date wheel 90 can be rotated counterclockwise in accordance with one of the internal teeth 92, and date feeding can be performed in accordance with 1 day. Further, if the date wheel 90 rotates in accordance with one of the internal teeth 92, the jump stopper 123 in the date arm 122 again enters between the internal teeth 92 adjacent in the circumferential direction, and thus the date wheel 90 again becomes a state in which the rotational position is corrected.

(guiding mechanism)

As shown in fig. 3, 4, and 6, the guide mechanism 130 serves to guide the rotation of the date wheel 90 rotating around the central axis C at a predetermined cycle. The guide mechanism 130 includes: a date indicator guide plate (rotation guide portion according to the present invention) 140 that is formed separately from the main plate 11 and is combined with the main plate 11 in a state of being disposed further inward in the radial direction than the internal teeth 92 of the date indicator 90; and a date wheel supporting guide (supporting guide according to the present invention) 150 provided on the main plate 11 in a state of being arranged parallel to the date wheel guide plate 140 along the circumferential direction of the date wheel 90.

As shown in fig. 4, the date wheel guide plate 140 is formed in a plate shape having a guide surface 141 located at the same height as the internal teeth 92 in the up-down direction as the thickness direction of the main plate 11. Specifically, as shown in fig. 3, the guide surface 141 is a curved surface formed with a radius R2 equal to or smaller than a radius R1 (see fig. 7) of the rotation locus M of the tooth tip in the internal teeth 92 centering around the central axis C, and is formed so as to face at least 2 teeth or more from the inside in the radial direction with respect to the internal teeth 92.

And is described in detail. As shown in fig. 3, the date indicator plate 140 according to the present embodiment is a strip-shaped plate which is a thin plate extending in the circumferential direction over an angular range of approximately 180 degrees around the central axis C and formed in an arc shape having a predetermined width in the radial direction. The date wheel guide plate 140 is combined with the main plate 11 so as to be located on the opposite side in the radial direction with respect to the center axis C as viewed from the center axis C with respect to the day wheel 100, the day wheel train 110, the date jumper 120, and the like. At this time, as shown in fig. 6 and 13, the date wheel guide plate 140 is combined with the main plate 11 in a state of being accommodated in the accommodation recess 160 formed in the main plate 11.

The accommodation recess 160 is formed to be recessed downward from the uppermost surface 11a of the main plate 11, which is most on the dial 4 side, and is formed to follow the outer shape of the date wheel guide plate 140. Further, the receiving recess 160 is formed in a size slightly larger than the date wheel guide plate 140 by one turn.

The date wheel guide plate 140 is accommodated in the accommodation recess 160 so as to be combined with the main plate 11 in a state of being positioned in the plane direction of the main plate 11. The thickness of the date indicator plate 140 is equal to the depth of the accommodating recess 160, and is not projected upward from the uppermost surface 11a of the main plate 11.

As shown in fig. 14, one peripheral end portion and the other peripheral end portion of the date wheel guide plate 140 are formed with: a positioning hole 142 through which a positioning pin 161 protruding upward from the bottom surface of the accommodation recess 160 is inserted; the insertion through hole 143 is inserted through by the coupling screw 162; and a relief hole 144 to avoid interference with other timepiece components. As shown in fig. 6, the date wheel guide plate 140 is accommodated in the accommodating recess 160 in a state in which the positioning pin 161 is inserted into the positioning hole 142, and is integrally combined with the main plate 11 by fastening the coupling screw 162 inserted through the through hole 143.

As shown in fig. 3 and 6, the outer peripheral surface of the date wheel guide plate 140 serves as the guide surface 141, and faces the inner teeth 92 from the inside in the radial direction. In particular, since the date wheel guide plate 140 of the present embodiment extends in the circumferential direction over an angular range of approximately 180 degrees centered on the central axis C, the guide surface 141 faces from the inside in the radial direction with respect to about half of the internal teeth 92 among the plurality of internal teeth 92.

However, since the date wheel 90 is pushed by the correction force applied to the outward side in the radial direction by the stopper 123 in the date jumper 120 as described above, the date jumper 120 is slightly eccentric on the whole. Thus, the inner tooth 92 located on the opposite side of the date jumper 120 in the radial direction among the plurality of inner teeth 92 is close to the guide surface 141 of the date wheel guide plate 140. In this regard, since the date wheel guide plate 140 is combined with respect to the date jumper 120 so that the guide surface 141 is located on the opposite side in the radial direction with respect to the central axis C as described above, the internal teeth 92 located on the opposite side in the radial direction from the date jumper 120 can be reliably brought into contact with the guide surface 141.

Further, a part of the guide surface 141 of the date indicator plate 140 located on the opposite side of the date jumper 120 in the radial direction serves as a relief surface 145 formed to be slightly recessed toward the inside in the radial direction. In the illustrated example, the relief surface 145 is formed as: the length in the circumferential direction is 3 tooth amounts corresponding to the internal teeth 92.

Therefore, in the stationary state in which the date wheel 90 is biased by the date jumper 120, as shown in fig. 3 and 6, the two internal teeth 92 located on both sides in the circumferential direction with respect to the three internal teeth 92 facing the opposing escape surface 145 reliably contact the guide surface 141 of the date wheel guide plate 140. Therefore, the date wheel 90 of the present embodiment is positioned with respect to the planar direction of the main plate 11 by the 4 points of the two contact positions (P1, P2) of the two internal teeth 92 with the guide surface 141 and the two engagement positions (i.e., the engagement position (P3) of the first engagement surface 123a of the click-stop portion 123 with the internal teeth 92 and the engagement position (P4) of the second engagement surface 123b of the click-stop portion 123 with the internal teeth 92) of the click-stop portion 123 with the internal teeth 92 in the date jumper 120. Further, as long as the date wheel 90 is in the stationary state, the positioning of the date wheel 90 based on the above 4 points is continued.

When the date wheel 90 is in the stationary state, the date wheel 90 corrects the rotational position (the position in the circumferential direction of the date wheel 90) by 2 points, i.e., the engagement position (P3) of the first engagement surface 123a of the stopper portion 123 with the internal teeth 92 and the engagement position (P4) of the second engagement surface 123b of the stopper portion 123 with the internal teeth 92.

As shown in fig. 3, 4 and 6, the date wheel auxiliary guide 150 is integrally formed with the main plate 11 in an arc shape having an auxiliary guide surface 151 located at the same height as the internal teeth 92 in the up-down direction as the thickness direction of the main plate 11. Specifically, the auxiliary guide surface 151 is a curved surface formed with a smaller radius R3 than the radius R2 of the guide surface 141 in the date wheel guide plate 140 centering around the central axis C, and is formed so as to face the inner teeth 92 from the inside in the radial direction.

And is described in detail. The date wheel supporting guide 150 according to the present embodiment is integrally formed on the main plate 11 by cutting or the like, and is formed so that the length in the circumferential direction is 2 teeth corresponding to the length of the internal teeth 92. Thereby, the auxiliary guide surface 151 faces the two internal teeth 92 from the inside in the radial direction. The date wheel supporting guide 150 is located between the date wheel 100 and the date wheel guiding plate 140, and is formed on the main plate 11 so as to be located radially outward of the date wheel train 110.

However, in the date wheel supporting guide 150, the supporting guide surface 151 is located at the same height as the internal teeth 92 in the up-down direction, but the supporting guide surface 151 is formed at a smaller radius R3 than the guide surface 141 in the date wheel guiding plate 140. Therefore, in a state where the internal teeth 92 of the date wheel 90 are in contact with the guide surface 141, that is, in a state where the date wheel 90 is stationary, the internal teeth 92 and the auxiliary guide surface 151 can be brought into a non-contact state.

(date correcting mechanism)

As shown in fig. 3 and 6, the date corrector 14 is disposed above the main plate 11 and in a region between the date wheel guide plate 140 and the rear wheel train 12. The date correcting mechanism 14 includes: a rocking plate 170 capable of rocking about a rocking axis S with movement of the stem 19 in the axial direction; a first wheel-spanning intermediate wheel 171 rotatably supported by the swing plate 170; a second wheel-span intermediate wheel 172 rotatably supported by the swing plate 170 and engaged with the first wheel-span intermediate wheel 171; a date correcting intermediate wheel 173 rotatably supported between the main plate 11 and the back side object pressing plate 15 and engaged with the second sidewheel intermediate wheel 172; and a date correcting wheel 174 rotatably supported between the main plate 11 and the back side object pressing plate 15, and engaged with the date correcting intermediate wheel 173.

The first and second intermediate wheels 171 and 172 are combined with the swing plate 170 in a state of being always engaged with each other. The rocking plate 170 is rocked to a position where the first intermediate wheel 171 is engaged with the intermediate wheel gear 62 in the intermediate wheel 60 when the stem 19 is moved to a 2-stage position where 2 stages are pulled out from the 0-stage position described earlier, for example, and is rocked so as to release the engagement of the first intermediate wheel 171 with the intermediate wheel gear 62 when the stem 19 is located outside the 2-stage position. In fig. 3 and 6, the engagement between the first idler intermediate wheel 171 and the idler gear 62 is released.

The second mid-wheel 172 is engaged with a small steel wheel, not shown. When the stem 19 is in the 1-stage position in which the 1-stage is pulled out from the 0-stage position or the 2-stage position, the small steel wheel is engaged with the clutch wheel. Therefore, by performing the rotating operation in a state where the stem 19 is pulled out to the 2-stage position, the first intermediate wheel 171 can be rotated via the clutch wheel, the small steel wheel, and the second intermediate wheel 172, whereby the intermediate wheel gear 62 can be rotated. As a result, the minute wheel 40 and the hour wheel 50 engaged with the fifth wheel gear 62 can be rotated to correct the time.

Further, by performing the rotating operation in a state where the stem 19 is pulled out to the 1-stage position, the second intermediate wheel 172 can be rotated via the clutch wheel and the small steel wheel, and the date correction wheel 174 can be rotated via the date correction intermediate wheel 173. The date corrector wheel 174 has date claws engaged with the second inclined surfaces 92b of the internal teeth 92 of the date wheel 90. Accordingly, the inner teeth 92 can be pressed in the counterclockwise direction by the rotation of the date corrector wheel 174 via the date claw, and the date can be fed to the date wheel 90. As a result, date correction can be performed. In addition, at the time of date correction, the engagement between the first idler intermediate wheel 171 and the idler gear 62 is released, and thus, no time correction is performed.

In addition, at the time of normal running, the stem 19 is not located at the 2-stage position, and therefore, not only is the engagement of the first intermediate wheel 171 with the intermediate wheel gear 62 released, but also the engagement of the small steel wheel with the clutch wheel is released. Therefore, even if the date corrector wheel 174 rotates by the internal teeth 92 of the date wheel 90, the entire date corrector mechanism 14 is free to idle, and thus the normal needle running is not affected.

(action of timepiece)

Next, the operation of the timepiece 1 configured as described above will be described. According to the timepiece of the present embodiment, the rotation of the front wheel train 16 and the back wheel train 12 can be controlled regularly by the power from the spring, and the second wheel and the third wheel 20 can be rotated in order. Accordingly, the fourth wheel 30 and the minute wheel 40 can be rotated together with the rotation of the third wheel 20, and the hour wheel 50 can be rotated via the straddle wheel 60. This allows the seconds hand 7, minute hand 6 and hour hand 5 to be moved.

However, if the hour wheel 50 rotates, the rotation force can be transmitted to the day changing wheel 100 via the day changing wheel system 110 (the first day changing intermediate wheel 111 and the second day changing intermediate wheel 115), and thus, as shown in fig. 3, the day changing gear 200 can be rotated in the counterclockwise direction about the fifth axis O5 by rotating once for 24 hours. As a result, the sun gear 100 rotates counterclockwise as a whole, and the sun gear pawl 240 gradually approaches the inner teeth 92 of the date wheel 90.

At this time, the date wheel 90 is stationary in a state where the rotational position is properly positioned by the engagement of the first engagement surface 123a of the stopper portion 123 with the internal teeth 92 (P3) and the engagement of the second engagement surface 123b of the stopper portion 123 with the internal teeth 92 (P4) in the date jumper 120. In addition, the date wheel 90 is positioned in the planar direction of the main plate 11 by two contact positions (P1, P2) of the two internal teeth 92 with the guide surface 141 of the date wheel guide plate 140 and 4 point contact of the click-stop portion 123 of the date jumper 120 with the two engagement positions (P3, P4) of the internal teeth 92. Therefore, the date wheel 90 is held in a stable state with little rattling, and for example, the date character 91 is not displaced from the date window 8, and the date character 91 can be clearly visually recognized.

Then, if the day changing wheel 100 is further rotated in the counterclockwise direction, as shown in fig. 15, the tip end portion 292 of the day changing regulating spring 290 is engaged with the regulating spring engaging portion 272 in the day changing wheel 100. This restricts the rotation of the day changing pawl unit 210 in the counterclockwise direction (forward rotation direction). Accordingly, the day changing gear 200 continues to rotate in the counterclockwise direction with respect to the day changing pawl unit 210. Thereby, the date changing gear 200 moves the shaft portion 207 of the restriction releasing pin 203 in the counterclockwise direction from the vicinity of the second peripheral end 271b of the pin guide hole 271 of the date changing pawl unit 210 and rotates at the same time. Then, the sun gear 200 winds up the sun work spring 220 while rotating in the counterclockwise direction. As a result, the date changing operation spring 220 increases the torque biasing the date changing pawl unit 210 in the counterclockwise direction and is wound up at the same time.

Then, as shown in fig. 16, if the rotation of the sun gear 200 is further continued, the shaft portion 207 of the restriction release pin 203 reaches the vicinity of the first peripheral end 271a (see fig. 10) of the pin guide hole 271. Then, the flange 208 of the restriction release pin 203 contacts the tip end 292 of the day changing restriction spring 290, and presses the tip end 292 of the day changing restriction spring 290 outward in the radial direction. This releases the engagement between the day changing regulating spring 290 and the regulating spring engaging portion 272. Furthermore, the day changing wheel 100 is designed to: for example, at a time point about 0 midnight, the engagement between the day changing regulating spring 290 and the regulating spring engaging portion 272 is released.

Thus, at a time point around 0 midnight, the wound daily changing operation spring 220 can be unwound at a time, and the spring force accumulated in the daily changing operation spring 220 can be released at a time to rapidly rotate the daily changing claw unit 210 in the counterclockwise direction. Therefore, as shown in fig. 16, the pawl main body 241 of the date changing pawl 240 can be rapidly moved in the counterclockwise direction, and the engagement surface 241a can be brought into contact with the second inclined surface 92b of the internal teeth 92 of the date wheel 90. This releases the jump by the date jumper 120 and instantaneously rotates the date wheel 90. As a result, the date can be instantaneously switched to perform date feeding.

However, at the time of the date feeding described above, the inner teeth 92 of the second engagement surface 123b of the stopper 123 engaged with the date jumper 120 elastically deform the date jumper spring portion 124 so as to push up the date arm portion 122 toward the inside in the radial direction, and at the same time, move in the counterclockwise direction so as to slide on the second engagement surface 123 b. Then, the internal teeth 92 pass over the second engagement surface 123b of the stopper 123 with the momentary rotation of the date wheel 90, and reach the apex of the stopper 123 as shown in fig. 16.

Accordingly, the date wheel 90 rotates counterclockwise with respect to one of the internal teeth 92, and the date arm 122 can be displaced by restoring the elastic restoring force of the date jumper spring portion 124, so that the stopper portion 123 can be brought between the internal teeth 92 adjacent to each other in the circumferential direction again. As a result, as shown in fig. 3 and 6, the rotational position of the date wheel 90 can be corrected again.

Therefore, the date wheel 90 can be made stationary in a state in which the rotational position of the date wheel 90 is again corrected by the engagement (P3) of the first engagement surface 123a of the stopper portion 123 with the internal teeth 92 and the engagement (P4) of the second engagement surface 123b of the stopper portion 123 with the internal teeth 92 in the date jumper 120. Further, the date wheel 90 can be stationary in a state of being positioned in the planar direction with respect to the main plate 11 by two contact positions (P1, P2) of the two internal teeth 92 with the guide surface 141 of the date wheel guide plate 140 and 4 point contact of the click-stop portion 123 of the date jumper 120 with the two engagement positions (P3, P4) of the internal teeth 92.

In particular, the timepiece 1 of the present embodiment includes a guide mechanism 130 for guiding rotation of the date wheel 90, and a date wheel guide plate 140 having a guide surface 141 formed to face at least 2 teeth of the internal teeth 92 from the inside in the radial direction is combined with the main plate 11. The guide surface 141 is formed with a radius R2 equal to or smaller than the radius R1 of the rotation locus M of each tooth tip in the internal teeth 92, and is located at the same height as the internal teeth 92. Therefore, as described above, in the stationary state of the date wheel 90, the internal teeth 92 of at least 2 teeth can be brought into contact with the guide surface 141, and the date wheel 90 can be positioned in the planar direction of the main plate 11.

Further, even if the date wheel 90 performs a behavior such as shaking in the planar direction of the main plate 11 when the date wheel 90 is rotated (date feeding), the internal teeth 92 can be brought into contact with the guide surface 141, and thus the behavior of the date wheel 90 can be suppressed. In addition, when the date wheel 90 rotates, the internal teeth 92 can be brought into sliding contact with the guide surface 141, and thus the date wheel 90 can be also guided to rotate. Further, even in the case of performing date feeding to the date wheel 90, since the click-stop portion 123 in the date click lever 120 is in contact with the internal teeth 92 as shown in fig. 16, the date wheel 90 can be positioned in the planar direction of the main plate 11 by the contact position (P5) and the 3-point contact of the two internal teeth 92 with the two contact positions (P1, P2) of the guide surface 141 in the date wheel guide plate 140.

In particular, as shown in fig. 3 and 6, the date wheel guide plate 140 can be formed separately from the main plate 11, and thus the date wheel guide plate 140 can be formed completely without being limited by the main plate 11. Therefore, the date indicator plate 140 can be formed in consideration of, for example, mechanical strength, hardness, sliding characteristics, and the like, and the degree of freedom in material selectivity can be improved. Therefore, damage, deformation, and the like of the guide surface 141 due to contact, collision, sliding contact, and the like with the internal teeth 92 can be suppressed, and deterioration of the date wheel guide plate 140 including the guide surface 141 can be suppressed. Therefore, the date wheel 90 can be stably and accurately guided to rotate over a long period of time.

Further, since only the date indicator plate 140 having the guide surface 141 is combined with the main plate 11, the number of parts can be suppressed unlike the case of using a conventional rolling element or the like, and the cost can be reduced and the maintainability can be improved. In addition, unlike conventional rolling elements and the like, the guide surface 141 can be machined with excellent accuracy, and machining variations and the like are less likely to occur.

As described above, according to the guide mechanism 130 of the present embodiment, the date indicator 90 can be stably and precisely rotatably guided over a long period of time, and the number of components can be reduced, thereby improving the cost and maintenance performance. Further, according to the calendar mechanism 13 of the present embodiment, since the date wheel 90 can be stably and precisely rotatably guided by the guide mechanism 130 over a long period of time, the date character 91 can be precisely displayed without being deviated from the date window 8 of the dial 4, for example. Therefore, according to the movement 10 and the timepiece 1 including the calendar mechanism 13, the movement and the timepiece having high quality and high performance can be obtained.

In particular, since the date wheel guide plate 140 is disposed such that the guide surface 141 is located at least on the opposite side in the radial direction from the center axis C of the date jumper 120, the date wheel 90 is biased outward in the radial direction due to the bias of the date jumper 120, and the internal teeth 92 can be reliably brought into contact with the guide surface 141. Therefore, in the stationary state, the date wheel 90 can be stably held. Further, since the guide surface 141 is accurately positioned within a functionally necessary range in consideration of the position of the date jumper 120, various timepiece parts can be disposed in other areas (spaces) of the main plate 11 without waste, and downsizing and thinning of the movement 10 can be facilitated.

Further, since the main plate 11 of the timepiece 1 of the embodiment is provided with the date wheel supporting guide 150 having the supporting guide surface 151, the following operational effects can be obtained. For example, when the date wheel 90 is excessively swung in the planar direction of the main plate 11 during rotation of the date wheel 90, the date wheel 90 may be undesirably displaced so that the internal teeth 92 are separated from the guide surface 141 of the date wheel guide plate 140. However, in this case, the internal teeth 92 can be brought into contact with the auxiliary guide surface 151, and unintended displacement of the date wheel 90 can be restricted. Further, since the internal teeth 92 can be brought into sliding contact with the auxiliary guide surface 151, the date wheel 90 can be appropriately rotationally guided.

In this manner, by providing the date wheel supporting guide 150, the date wheel 90 can be appropriately guided to rotate while suppressing excessive movement of the date wheel 90 in the planar direction of the main plate 11. Further, even when an unexpected external force acts on the date wheel 90 due to, for example, a drop impact or the like, excessive movement of the date wheel 90 in the planar direction of the main plate 11 can be suppressed by the date wheel supporting guide 150.

Further, since the date wheel supporting guide 150 is integrally formed on the main plate 11, the date wheel supporting guide 150 can be formed simultaneously when the main plate 11 is formed in a predetermined shape or the like by, for example, cutting. Therefore, the number of parts can be reduced, and the cost can be reduced. However, the date wheel supporting guide 150 is not necessarily integrally formed with the main plate 11, and for example, the date wheel supporting guide 150 may be formed separately from the main plate 11 and integrally combined with the main plate 11.

(modification of the first embodiment)

In the first embodiment described above, it is preferable that the date wheel guide plate 140 is formed of a high-hardness material having a hardness higher than that of the main plate 11. For example, it is preferable that main plate 11 is formed of a copper-based metal material such as brass, which is generally used, and date indicator plate 140 is formed of a high-hardness material such as carbon steel, stainless steel, or ceramic. By doing so, the entire date indicator plate 140 can be formed hard including the guide surface 141, and resistance to friction force can be improved. Therefore, damage, deformation, and the like are less likely to occur on the guide surface 141 due to contact, collision, sliding contact, and the like with the internal teeth 92, and deterioration of the date wheel guide plate 140 including the guide surface 141 can be further suppressed.

In the first embodiment, as shown in fig. 17, at least the guide surface 141 of the date indicator plate 140 may be formed with a cover layer 180 having a smaller friction coefficient than the main plate 11. Specifically, for example, the cover layer 180 may be formed of a fluororesin (teflon (registered trademark) resin or the like) by performing a surface lubrication treatment such as a fluororesin coating or the like, or the cover layer 180 may be formed by performing a surface lubrication treatment such as a teflon (registered trademark) plating treatment or the like.

By doing so, at least the guide surface 141 is covered with the cover layer 180 having a smaller friction coefficient than the main plate 11, and thus the sliding characteristic of the guide surface 141 can be improved. Therefore, damage, deformation, and the like to the guide surface 141 due to contact, collision, sliding contact, and the like with the internal teeth 92 can be effectively suppressed, and deterioration of the date wheel guide plate 140 including the guide surface 141 can be further suppressed. In fig. 17, the cover 180 is formed on the guide surface 141, but the cover 180 may cover the entire date wheel guide plate 140. Further, it is more preferable that not only the date wheel guide plate 140 itself is formed of a high-hardness material such as carbon steel as described above, but also the entirety of the date wheel guide plate 140 is subjected to teflon (registered trademark) plating treatment.

(second embodiment)

Next, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the first embodiment, 1 date wheel guide plate 140 extending in the circumferential direction is combined with the main plate 11, but in the second embodiment, a plurality of date wheel guide plates are combined with the main plate 11.

As shown in fig. 18, the guide mechanism 190 of the present embodiment includes a first date wheel guide plate 191, a second date wheel guide plate 192, and a third date wheel guide plate 193. These first date wheel guide 191, second date wheel guide 192, and third date wheel guide 193 function as rotation guides according to the present invention, and are combined with the main plate 11. In fig. 18, the first date wheel guide 191, the second date wheel guide 192, the third date wheel guide 193, the date wheel 90, and the date jumper 120 are mainly illustrated, and the other timepiece components are not illustrated.

The first date wheel guide 191, the second date wheel guide 192, and the third date wheel guide 193 overlap the main plate 11 using the positioning pin 161 mounted to the main plate 11, and are combined with the main plate 11 using the coupling screw 162. The first date wheel guide 191 and the second date wheel guide 192 are located on opposite sides of the date jumper 120 in the radial direction with respect to the central axis C as viewed in the direction of the central axis C, and are arranged at intervals in the circumferential direction. The third date wheel guide plate 193 is located on the clockwise side than the second date wheel guide plate 192.

The outer peripheral surface of the first date indicator plate 191 is formed with a radius R2 equal to or smaller than a radius R1 (see fig. 7) of the rotation locus M of the tooth tips in the internal teeth 92 centering on the central axis C, and serves as a guide surface 195 facing at least 2 teeth or more of the internal teeth 92 from the inside in the radial direction. Similarly, the outer peripheral surfaces of the second date wheel guide plate 192 and the third date wheel guide plate 193 are formed with a radius R2 equal to or smaller than a radius R1 of the rotation locus M of the tooth tips in the internal teeth 92 centered on the central axis C, and serve as guide surfaces 195 facing at least 2 teeth or more of the internal teeth 92 from the inside in the radial direction.

Even the guide mechanism 190 of the present embodiment configured as described above can provide the same operational effects as those of the first embodiment. In particular, the first day wheel guide plate 191 and the second day wheel guide plate 192 are arranged such that the guide surface 195 is located at least on the opposite side in the radial direction with respect to the date jumper 120 with the central axis C therebetween. Therefore, in the stationary state biased by the date jumper 120, the date wheel 90 is reliably in contact with one of the internal teeth 92 facing the first date wheel guide 191 with respect to the guide surface 195, and is reliably in contact with one of the internal teeth 92 facing the second date wheel guide 192 with respect to the guide surface 195.

Therefore, even in the case of the present embodiment, the date wheel 90 can be stopped with the rotation position properly positioned by the engagement of the first engagement surface 123a of the stopper portion 123 with the internal teeth 92 (P3) and the engagement of the second engagement surface 123b of the stopper portion 123 with the internal teeth 92 (P4) in the date jumper 120. In addition, the date wheel 90 can be positioned in the planar direction of the main plate 11 by the two contact positions (P1, P2) of the two internal teeth 92 and the guide surface 195 and the 4-point contact of the stopper 123 of the date jumper 120 and the two engagement positions (P3, P4) of the internal teeth 92.

In the second embodiment, for example, the guide surface 195 of the third date indicator guide plate 193 may be formed to have a smaller radius from the center axis C than the guide surface 195 of the first date indicator guide plate 191 or the like, and may function as an auxiliary guide surface according to the present invention.

(third embodiment)

Next, a third embodiment of the present invention will be described with reference to the drawings. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 19 and 20, the guide mechanism 130 of the present embodiment includes a date wheel guide plate 140 having protruding pieces 300, and the protruding pieces 300 protrude outward in the radial direction so as to overlap the internal teeth 92 in the thickness direction of the main plate 11, thereby correcting the position of the date wheel 90 in the thickness direction. The protruding piece 300 is formed along the outer peripheral edge portion of the date wheel guide plate 140, and protrudes in a convex shape toward the outer side in the radial direction so as to be located above the guide surface 141. Thus, the protruding piece 300 is located above the internal teeth 92, and is configured to cover at least the tooth tip side in the internal teeth 92 from above.

According to the date indicator guide plate 140 of the present embodiment thus configured, not only the same operational effects as those of the first embodiment can be obtained, but also the position correction of the date indicator 90 in the thickness direction of the main plate 11 can be performed by the protruding piece 300. Therefore, for example, the size of the back side object pressing plate 15 for pressing the date wheel 90 can be reduced, and space saving and the like can be easily achieved.

While the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. Examples of the embodiments and modifications thereof include examples that can be easily assumed by those skilled in the art, examples that are substantially the same, examples that are equivalent in scope, and the like.

For example, in the above embodiments, the mechanical timepiece 1 has been described as an example, but the present invention is not limited to this case, and is applicable to, for example, a quartz timepiece. In this case, for example, each wheel may be rotated by the driving force of the stepping motor.

In the above embodiments, the date wheel has been described as the display wheel for displaying information, but the present invention is not limited to the date wheel. For example, a day wheel for displaying a day as information may be applied as the display wheel, or other display wheels for displaying various information may be used.

Symbol description

C … … central axis (axis)

M … … rotation track

1 … … clock

10 … … movement

11 … … main board

13 … … calendar mechanism (information display mechanism)

90 … … date wheel (display wheel)

92 … … internal teeth

100 … … sun-changing wheel (runner)

120 … … date jumping bar (correcting component)

130. 190 … … guiding mechanism

140 … … date wheel guide plate (rotating guide)

141. 195 … … guide surfaces

Auxiliary guide (auxiliary guide) of 150 … … date wheel

151 … … auxiliary guide surface

180 … … cover layer

240 … … day-changing claw (rotating claw)

300 … … tab.

Claims

1. A guide mechanism having a plurality of internal teeth and guiding a ring-shaped display wheel on which information is displayed to rotate around an axis of a main plate in a predetermined cycle, characterized in that,

the display device includes a rotation guide portion formed separately from the main plate and combined with the main plate in a state of being disposed further inward in a radial direction of the display wheel than the internal teeth,

the rotation guide portion has a guide surface located at the same height as the internal teeth in a thickness direction of the main plate,

the guide surface is a curved surface formed with a radius equal to or smaller than a radius of a rotation locus of a tooth tip in the internal teeth, centering on the axis, and is opposed to at least 2 teeth from the inner side in the radial direction with respect to the internal teeth.

2. The guide mechanism according to claim 1, wherein the rotation guide portion is formed of a high-hardness material having a higher hardness than the main plate.

3. The guide mechanism according to claim 1 or 2, wherein a cover layer having a smaller friction coefficient than the main plate is formed at least on the guide surface at the rotation guide portion.

4. The guide mechanism according to claim 1 or 2, wherein,

an auxiliary guide portion provided on the main plate in a state of being arranged side by side with respect to the rotation guide portion along a circumferential direction of the display wheel,

the auxiliary guide portion has an auxiliary guide surface located at the same height as the internal teeth in the thickness direction of the main plate,

the auxiliary guide surface is formed as a curved surface having a smaller radius than the guide surface with the axis as a center, and faces the internal teeth from the inside in the radial direction.

5. The guide mechanism of claim 4, wherein the auxiliary guide is integrally formed on the main plate.

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

the rotation guide portion includes a protruding piece that protrudes outward in the radial direction so as to overlap the internal teeth in the thickness direction of the main plate, and corrects the position of the display wheel in the thickness direction.

7. An information display mechanism, comprising:

the guide mechanism according to any one of claims 1 to 6;

the display wheel;

a wheel having a rotating claw capable of meshing with respect to the internal teeth, the wheel being rotated around the axis at a predetermined cycle; and

and a correction member that corrects a rotational position of the display wheel by a correction force biasing the display wheel toward an outer side in the radial direction.

8. The information display mechanism according to claim 7, wherein the rotation guide portion is configured to: the guide surface is located at least on the opposite side of the radial direction with respect to the corrective element with the axis therebetween.

9. The information display mechanism according to claim 7 or 8, wherein the display wheel is provided as a date wheel that displays date characters as the information.

10. A movement characterized by being provided with the information display mechanism according to any one of claims 7 to 9.

11. A timepiece comprising the movement according to claim 10.