JP2021124466A - Running wheel and timepiece - Google Patents

Abstract

To prevent a display wheel from being broken even when the display wheel is difficult to move in a running wheel for rotating the display wheel.SOLUTION: A running wheel 20 includes: a flexible elastic piece unit 27 in which a pressing tooth 24 for pressing a tooth of a date indicator in a rotation direction R is formed at an outer section farthest from a center of rotation, and an engaged unit 28 is formed at an inner section nearer from a center than the pressing tooth 24; and an engaging unit 29 that is formed apart from the engaged unit 28 and engaged with the engaged unit 28 by deflection of the elastic piece unit 27. In a case where the date indicator does no rotate even when the pressing tooth 24 presses the tooth of the date indicator by rotation of the running wheel 20, the elastic piece unit 27 bends according to rotation of the running wheel 20. The engaging portion 29 engages with the engaged unit 28 of the bent elastic piece unit 27 to cause the elastic piece unit 27 to bend radially inward according to rotation of the running wheel 20, thereby separating the pressing tooth 24 from the tooth of the date indicator.SELECTED DRAWING: Figure 4

Description

The present invention relates to a wheel and a clock.

For example, a clock with a calendar has a structure in which date numbers are exposed from a display window formed on a dial. Here, on the back side of the dial, a date wheel formed in a ring shape and having date numbers displayed side by side in the circumferential direction is arranged. As the day wheel that meshes with the day wheel rotates, the day wheel rotates by a predetermined angle, and the numbers (date display) exposed from the display window change in sequence. The day wheel is driven by a cylinder wheel that rotates the hour hand.

By the way, when manually adjusting the date and time, it is performed by operating an external operating member of the timepiece. At this time, an external operating member, which is a drive path different from that of the wheel, meshes with the wheel. Here, if the wheel is engaged with the wheel during manual correction, the wheel may be damaged because the wheel presses the wheel from the rear side in the rotation direction by an external operating member. ..

Therefore, the teeth of the wheel that mesh with the wheel are formed at the tip of the elastic piece, and when the wheel is pressed by the wheel, the elastic piece that receives the pressing force bends and the teeth of the wheel bend. A structure has been proposed in which the pressing force received from the wheel is released away from the teeth of the wheel (see, for example, Patent Document 1).

On the other hand, if the external operating member is left in a state of being engaged with the date wheel, the day wheel continues to rotate even though the day wheel is in a stationary state. Here, the torque for rotating the date wheel by the external operating member is set to be larger than the torque for rotating the date wheel by the day wheel. Therefore, if the wheel rotates while the external operating member is engaged with the wheel and the wheel is stopped, excessive torque may be applied to the wheel to damage the wheel.

Therefore, instead of the teeth of the day wheel pressing the teeth of the day wheel to rotate the day wheel, the teeth of the day wheel are formed so that the teeth of the day wheel pull the teeth of the day wheel to rotate the day wheel. A technique has been proposed in which the elastic piece is formed in front of the teeth of the date wheel in the direction of rotation (see, for example, Patent Document 2).

Jikkenhei 1-141487 Japanese Unexamined Patent Publication No. 2000-304878

However, since the technique disclosed in Patent Document 2 separates the teeth of the day wheel from the teeth of the day wheel only by the elastic deformation of the elastic piece itself due to the rotation of the day wheel, individual differences in the elastic deformation For some reasons, it is not possible to separate the teeth of the wheel from the teeth of the wheel as intended.

It should be noted that the cause of the rotation of the wheel while the wheel is stopped is not limited to the case of date correction using the above-mentioned external operating member. That is, the movement of the watch including the date wheel may be stored and transported, for example, in a state where the date wheel is covered with a cushioning material such as a sponge. At this time, the day wheel is pressed by the cushioning material and does not rotate, but the day wheel moves so as to rotate the day wheel, and excessive torque may act on the day wheel to damage it.

In addition to these factors, the risk of damage to the wheel can occur even when the wheel is difficult to move due to factors such as the accuracy of the wheel and the accuracy of assembly.

Also, the problem described above does not only occur with the combination of the date wheel that displays the date and the wheel that rotates the date wheel, but also displays information other than the date (for example, the day of the week or the name of a city in the world). The same can occur in the combination of the display vehicle and the turning wheel that rotates the display vehicle.

The present invention has been made in view of the above circumstances, and provides a turning wheel capable of preventing damage even when the rotating display vehicle is difficult to move, and a clock provided with the turning wheel and the display vehicle. The purpose is.

The first aspect of the present invention is a turning wheel that presses and rotates the teeth of the display wheel by rotation, and a pressing portion that presses the teeth in the rotation direction of the display wheel is formed on the outermost portion farthest from the center of rotation. A flexible elastic piece portion in which an engaged portion is formed in an inner portion closer to the center than the pressing portion, and an elastic piece portion formed apart from the engaged portion. The elastic piece portion includes an engaging portion that engages with the engaged portion due to the deflection of the wheel, and the display wheel does not rotate even if the pressing portion presses the teeth due to the rotation of the turning wheel. When It is a wheel that bends inward and separates the pressing portion from the teeth.

The second aspect of the present invention is a timepiece including a display wheel and a turning wheel according to the present invention for rotating the display wheel.

According to the turning wheel and the clock according to the present invention, it is possible to prevent the rotating display wheel from being damaged even when it is difficult to move.

It is a perspective view which shows the day wheel which is one Embodiment of the turning wheel which concerns on this invention, and the movement which includes the day wheel rotated by this day wheel. It is a top view which shows the timepiece which built in the movement shown in FIG. It is a perspective view which shows the day wheel and the day wheel which has the pressing tooth which meshes with the tooth of the day wheel. It is a top view which shows the day wheel. It is a schematic diagram which shows the operation of the day wheel when the day wheel does not move, and shows the state which the pressing tooth has started to press a tooth in the rotation direction R. It is a figure corresponding to FIG. 5 which shows the state which the wheel has rotated from the state shown in FIG. It is a figure corresponding to FIG. 5 which shows the state which the wheel has rotated from the state shown in FIG. It is a figure corresponding to FIG. 5 which shows the state which the wheel has rotated from the state shown in FIG. 7. It is a schematic diagram which shows the operation of the day wheel when the day wheel does not move, and shows the state which the pressing tooth is detached from a tooth. It is a top view corresponding to FIG. 4 which shows the day wheel of a modification.

Hereinafter, an embodiment of a wheel and a clock using the wheel according to the present invention will be described with reference to the drawings.

<Clock>
FIG. 1 is a perspective view showing a movement 80 including a day wheel 20 according to an embodiment of the turning wheel according to the present invention and a day wheel 10 rotated by the day wheel 20, and FIG. 2 is a perspective view showing the movement shown in FIG. It is a top view which shows the clock 100 which built-in 80. The clock 100 is an embodiment of the clock according to the present invention.

As shown in FIG. 2, the timepiece 100 includes a movement 80, a dial 2, and a pointer 3 (hour hand 3a, minute hand 3b, and second hand 3c) inside the case 1. Further, the watch 100 covers the upper part of the pointer 3 and the dial 2 with the windshield 6 fixed to the case 1.

The movement 80 is arranged on the back side of the dial 2. The movement 80 includes a day wheel 10 (an example of a display car) and a day wheel 20 which will be described later.

The dial 2 is provided with an index bar 2b at every 30 [degrees] of an angle around the center C1. Four scales 2c are displayed at equal intervals between the two adjacent index bars 2b, respectively.

The index bar 2b is not provided at the 3 o'clock position of the dial 2, and a rectangular opening 2a is formed. The opening 2a exposes one of the numbers corresponding to the date number 12 displayed on the date wheel 10 provided on the movement 80 to the front surface side of the dial 2.

Further, at the center of the dial 2, a pointer shaft 4 to which each pointer of the movement 80 is attached penetrates toward the front surface side. Each pointer 3 is fixed to any of the corresponding axes 4a, 4b, 4c of the pointer axis 4 and rotates around the pointer axis 4. Each pointer 3 indicates the time by pointing to the index bar 2b and the scale 2c.

<Movement>
The movement 80 rotates around the center C1 shown in FIG. 2 by a drive source such as a royal fern or a motor (not shown), a wheel train that transmits the rotational drive force of the drive source, and a rotary drive force transmitted by the wheel train. A winding stem 72 connected to a crown 71 (see FIG. 2), which is an example of an external operating member, and a main plate 5 for holding a drive source, a train wheel, a wheel train, a wheel train receiver, and the like. It is equipped with a day wheel 10 and a day wheel 20.

<Sun wheel>
The date wheel 10 is an example of a display wheel in the present invention, and is formed in an annulus band shape, and is arranged so that the center of the annulus coincides with the center C1 in the movement 80. On the front surface 11 (the surface closer to the dial 2) of the date wheel 10, as shown in FIG. 2, 31 numbers 12 representing the date are located around the center C1 along the circumferential direction. It is displayed at equal intervals. In FIG. 1, the display of the number 12 is omitted.

On the inner peripheral portion of the annulus of the date wheel 10, the same number of teeth 13 as the number (31) of the displayed number 12 is formed so as to correspond to the position of the displayed number 12. Therefore, when the number 12 of the date wheel 10 is exposed from the opening 2a of the dial 2 and the number 12 of the date wheel 10 is rotated by one tooth 13, the next number 12 adjacent to the number 12 is next to the number 12. The number 12 is exposed from the opening 2a.

An early correction mechanism meshes with the teeth 13 of the date wheel 10. The quick correction mechanism rotates the date wheel 10 by rotating the winding stem 72 in conjunction with the movement of the winding stem 72 in a state where the winding stem 72 is pulled. On the other hand, in the state where the winding stem 72 is pushed back to the original position, the quick correction mechanism does not interlock with the winding stem 72, so that the date wheel 10 does not rotate even if the winding stem 72 is rotated.

<Hamster wheel>
FIG. 3 is a perspective view showing the day wheel 10 and the day wheel 20 having pressing teeth 24 that mesh with the teeth 13 of the day wheel 10, and FIG. 4 is a plan view showing the day wheel 20. The day wheel 20 is an example of the turn wheel according to the present invention, and rotates the day wheel 10 which is an example of the display car.

As shown in FIGS. 3 and 4, the day wheel 20 is formed in a substantially disk shape. For example, 14 teeth 21 are formed on the outer peripheral portion of the day wheel 20 at equal intervals around the center. These teeth 21 mesh with the teeth 62 of the day turning intermediate wheel 61 (see FIG. 1).

The day turning intermediate wheel 61 has seven teeth 62 formed at equal intervals around the center C1. The day turning intermediate wheel 61 rotates integrally with the cylinder wheel (see FIG. 1) which is the shaft 4a to which the hour hand 3a is fixed among the pointer shafts 4. Since the shaft (cylinder wheel) 4a makes one rotation in 12 hours, the daily intermediate wheel 61 also makes one rotation in 12 hours.

Since the daily wheel 20 has 14 teeth 21, when the daily intermediate wheel 61 makes two rotations, the daily wheel 20 makes one rotation. Therefore, the day wheel 20 makes one revolution in 24 hours.

As shown in FIG. 4, the day wheel 20 has an elastic piece portion 27. The elastic piece portion 27 has a fixed end and a free end, and the free end has flexibility that allows the free end to be displaced inward and circumferentially in the radial direction of the wheel 20. One of the 14 teeth 21 formed on the wheel 20 is formed at the free end of the elastic piece portion 27.

Hereinafter, the tooth 21 formed on the elastic piece portion 27 is referred to as a pressing tooth 24 (pressing portion) in order to distinguish it from the other 13 teeth 21. Further, of the 14 teeth 21 formed on the day wheel 20, the tooth 21 formed immediately after the rotation direction R of the day wheel 20 of the pressing tooth 24 is used as the auxiliary pressing tooth 23 (auxiliary pressing portion). There is that.

Of the 14 teeth 21 of the day wheel 20, 13 teeth 21 excluding the pressing tooth 24 are formed at positions having the same radius (radius r1) from the center of the day wheel 20 as shown in FIG. However, only the pressing tooth 24 is formed at a position having a radius (radius r2 (> r1)) larger than that of the other 13 teeth 21.

The center of the day wheel 20 is arranged at a position corresponding to the center C2. Here, the center C2 is a position set so that the distance from the center C2 to the teeth 13 of the date wheel 10 is longer than the radius r1 and shorter than the radius r2.

The elastic piece portion 27 extends from the tip end side of the first elastic piece 26, which can be flexed mainly in the radial direction of the day wheel 20, to the outside in the radial direction of the day wheel 20, and is used for day rotation. A second elastic piece 25 that can bend mainly in the circumferential direction of the car 20 is integrally formed.

The first elastic piece 26 is formed so as to extend from the fixed end to the front in the rotation direction R of the wheel 20. Therefore, the free end (tip) of the first elastic piece 26 is formed in front of the fixed end in front of the rotation direction R of the day wheel 20.

The second elastic piece 25 is formed so as to extend outward in the radial direction of the day wheel 20 with the vicinity of the tip of the first elastic piece as a fixed end. Therefore, the free end (tip) of the second elastic piece 25 is formed outside the fixed end in the radial direction of the wheel 20.

The first elastic piece 26 and the second elastic piece 25 are integrated so as to intersect at an acute angle, and the tip of the first elastic piece 26 is in the rotation direction R more than the tip of the second elastic piece 25. It is located in front.

At the tip of the first elastic piece 26, an engaged portion 28 protruding outward in the radial direction of the wheel 20 is formed. The above-mentioned pressing teeth 24 are formed at the tip of the second elastic piece 25. Therefore, the engaged portion 28 is located in front of the pressing tooth 24 in the rotation direction R.

Further, the pressing teeth 24 are located on the outermost side in the radial direction of the wheel 20. Therefore, the engaged portion 28 is formed inside the rotating wheel 20 in the radial direction with respect to the pressing teeth 24.

When the elastic piece 27 bends, the pressing tooth 24 is displaced inward in the radial direction from the natural state where the elastic piece 27 is not loaded (the state before bending), and at this time, the pressing tooth 24 is pressed. The tooth 24 is also displaced at a position having the same radius r1 as the other 13 teeth 21 and at a position substantially equal to the other teeth 21.

As a result, all the teeth 21 of the daily wheel 20 including the pressing teeth 24 mesh with the teeth 62 of the daily intermediate wheel 61 without any trouble, and the daily wheel 20 rotates according to the rotation of the daily intermediate wheel 61.

Here, when the day wheel 20 does not rotate even if the day wheel 10 rotates in the rotation direction R, or when the rotation speed of the day wheel 10 in the rotation direction R is faster than the rotation speed of the day wheel 20. The teeth 13 of the sun wheel 10 are in contact with the pressing teeth 24 of the sun wheel 20 from the rear side in the rotation direction R, and the pressing teeth 24 are pressed by the teeth 13 in front of the rotation direction R and displaced forward.

Since the wheel 20 on which the pressing teeth 24 are formed does not rotate or the rotation speed is relatively slow, the elastic piece portion 27 having the pressing teeth 24 formed at the tip thereof bends. As the bending of the elastic piece portion 27 increases, the pressing tooth 24 is displaced inward in the radial direction, and the engagement allowance of the pressing tooth 24 with respect to the tooth 13 becomes smaller. It comes off from the tooth 13.

Further, inside the tooth 21 of the day wheel 20 located in front of the pressing tooth 24 in the rotation direction R in the radial direction, the elastic piece portion 27 is in the natural state of the engaged portion 28 in the rotation direction. A distant engaging portion 29 is formed at a rear position. The position of the engaged portion 28 with respect to the engaging portion 29 changes due to the bending of the elastic piece portion 27.

Then, when the elastic piece portion 27 does not rotate even if the wheel 20 rotates in the rotation direction R, the elastic piece portion 27 flexes relatively rearward in the rotation direction R. That is, when the pressing teeth 24 formed at the tip of the elastic piece portion 27 are in contact with the teeth 13 of the non-rotating day wheel 10 from the rear side in the rotation direction R and the displacement is stopped, the day wheel 20 As the rotation progresses, the elastic piece portion 27 bends backward in the rotation direction R relative to the entire wheel 20.

Here, when the day wheel 10 does not rotate even if the day wheel 20 rotates in the rotation direction R, the tip (pressing tooth 24) of the second elastic piece 25 is relatively displaced rearward in the rotation direction R. Bend. Due to the elastic force generated in the second elastic piece 25 due to this bending, the fixed end of the second elastic piece 25 (near the tip of the first elastic piece 26) is displaced outward in the radial direction and rearward in the rotation direction R. , The first elastic piece 26 bends. Due to this bending, the engaged portion 28 approaches the engaging portion 29 which is separated behind the rotation direction R on the outer side in the radial direction.

As the rotation of the day wheel 20 progresses and the bending of the elastic piece portion 27 increases, the engaged portion 28 comes into contact with the engaging portion 29, and the engaged portion 28 and the engaging portion 29 engage with each other. .. After that, the engaged portion 28 and the engaging portion 29 are in contact with each other and engaged with each other, and the engaging portion 29 pulls the elastic piece portion 27 in the rotation direction R by the rotation of the wheel 20.

As a result, in the elastic piece portion 27, the first elastic piece 26 is mainly bent inward in the radial direction, and the entire second elastic piece 25 is displaced inward in the radial direction. Then, the pressing tooth 24 formed at the tip of the second elastic piece 25 is displaced inward in the radial direction, and the engagement allowance of the pressing tooth 24 with respect to the tooth 13 becomes smaller. 24 comes off the tooth 13.

<Action>
According to the clock 100 of the present embodiment configured as described above, when the day wheel 20 rotates around the center C2, the pressing teeth 24 having a radius r2 from the center C2 are the teeth 13 of the day wheel 10. The date wheel 10 is rotated in the rotation direction R by engaging with. On the other hand, the other teeth 21 (excluding the pressing teeth 24) having a radius of r1 from the center C2 do not mesh with the teeth 13 of the date wheel 10 and do not rotate the date wheel 10.

The rotation angle around the center C1 in which the pressing teeth 24 mesh with the teeth 13 of the date wheel 10 to rotate the date wheel 10 coincides with the angle interval in which 31 numbers 12 representing the date are displayed. As a result, the pressing teeth 24 mesh with the teeth 13 and rotate the date wheel 10 by an angle corresponding to one date only within a predetermined one hour out of 24 hours.

As described above, as described above, the day wheel 20 rotates the day wheel 10 while the clock 100 is in the normal hand movement operation, that is, while the clock 100 is in the hand movement operation for displaying the time.

Here, during the normal hand movement of the watch 100, the pressing teeth 24 of the day wheel 20 are in mesh with the teeth 13 of the day wheel 10, and the operation of the crown 71 by the user causes quick correction. When the date wheel 10 is rotated by the mechanism meshing with the day wheel 10 and rotating the winding stem 72, the day wheel 10 is rotated in the rotation direction R in the state shown in FIG.

Then, the tooth 13 of the date wheel 10 located behind the pressing tooth 24 in the rotation direction R comes into contact with the pressing tooth 24 from the rear of the pressing tooth 24. As the rotation of the date wheel 10 further progresses, the tooth 13 of the date wheel 10 in contact with the pressing tooth 24 from behind the pressing tooth 24 presses the pressing tooth 24 forward in the rotation direction R.

Since the pressing tooth 24 is formed at the free end of the elastic piece portion 27, the elastic piece portion 27 is formed in the rotation direction R mainly by the action of the second elastic piece 25 by pressing forward from the tooth 13 in the rotation direction R. As well as bending forward, it bends inward in the radial direction of the day wheel 20 mainly due to the action of the first elastic piece 26.

When the pressing force by the tooth 13 on the pressing tooth 24 further progresses, the bending of the elastic piece portion 27 becomes larger, and the radius r2 from the center C2 to the pressing tooth 24 becomes equal to or less than the distance from the center C2 to the tooth 13. As a result, the pressing tooth 24 escapes inward in the radial direction from the tooth 13 pressing the pressing tooth 24 forward, and the tooth 13 overtakes the pressing tooth 24 and exits in front of the rotation direction R.

Since the load pressed forward is removed from the pressing teeth 24, the elastic force generated by the bending restores the pressing teeth 24 to the natural state before the bending.

As described above, even when the operation by the quick correction mechanism is performed while the clock 100 is in the normal hand movement operation and the pressing teeth 24 of the wheel 20 are in mesh with the teeth 13 of the wheel 10. , The day wheel 20 and the day wheel 10 are not damaged.

Further, contrary to the above-mentioned state, the quick correction mechanism is in the state where the pressing teeth 24 of the day wheel 20 are in mesh with the teeth 13 of the day wheel 10 during the normal hand movement operation of the clock 100. If left in a state of being meshed with 10, the day wheel 20 continues to rotate even though the day wheel 10 is in a stationary state. In this case, the clock 100 of the present embodiment operates as described below.

5 to 9 are schematic views showing the operation of the day wheel 20 when the day wheel 10 does not move, and FIG. 5 shows a state in which the pressing teeth 24 start pressing the teeth 13 in the rotation direction R, and FIG. , 7 and 8 show that the rotation of the wheel 20 progresses in the order shown, and FIG. 9 shows a state in which the pressing teeth 24 are separated from the teeth 13.

As shown in FIG. 5, during the normal hand movement operation of the clock 100, the pressing teeth 24 come into contact with the rear side of the rotation direction R of the teeth 13 of the date wheel 10 to try to rotate the date wheel 10 in the rotation direction R. At that time, if the early correction mechanism is left in a state of being meshed with the day wheel 10 and the day wheel 10 is not moving, it may be difficult for the day wheel 10 to rotate with the torque of the day wheel 20.

Therefore, as shown in FIGS. 6 and 7, as the rotation of the wheel 20 progresses, the pressing teeth 24 in contact with the teeth 13 do not move, but the pressing teeth 24 of the wheel 20 are formed. The portions other than the elastic piece portion 27 continue to rotate in the rotation direction R.

Since the pressing teeth 24 are formed at the free end of the elastic piece portion 27, the elastic piece portion 27 mainly acts on the main body portion of the wheel 20 other than the elastic piece portion 27 by the second elastic piece 25. As a result, it flexes relatively backward in the rotation direction R, and also flexes outward in the radial direction of the day wheel 20 mainly due to the action of the first elastic piece 26.

As the rotation of the day wheel 20 progresses, the bending of the elastic piece portion 27 in the rearward direction of the relative rotation direction R and the bending of the elastic piece portion 27 in the radial direction increase. As a result, the engaged portion 28 formed at the tip of the first elastic piece 26 is naturally formed so as to be rearward of the engaged portion 28 and outside in the radial direction with respect to the engaged portion 28. It approaches the engaging portion 29 relatively from the front in the rotation direction R and from the inside in the radial direction.

After that, as shown in FIG. 6, the engaged portion 28 and the engaging portion 29 are in contact with each other and are engaged with each other, and further rotation of the day wheel 20 in the rotation direction R causes the engaging portion 28 to be further rotated in the rotation direction R, as shown in FIGS. 7 and 8. , The elastic piece portion 27 is pulled forward in the rotation direction R in a state where the engaging portion 29 is engaged with the engaged portion 28.

Then, mainly due to the inward bending of the first elastic piece 26 in the radial direction, the entire second elastic piece 25 is displaced inward in the radial direction, and the pressing teeth formed at the tip of the second elastic piece 25. The 24 is displaced inward in the radial direction, and the radius r2 from the center C2 to the pressing tooth 24 becomes equal to or less than the distance from the center C2 to the tooth 13.

As a result, as shown in FIG. 9, the pressing tooth 24 escapes inward in the radial direction from the tooth 13 pressing the pressing tooth 24 forward, overtakes the tooth 13, and exits in front of the rotation direction R.

Since the reaction force that presses the front tooth 13 disappears, the pressing tooth 24 is restored to the natural state before bending by the elastic force generated by the bending.

As described above, in the clock 100 of the present embodiment, the quick correction mechanism is set in a state where the pressing teeth 24 of the day wheel 20 are engaged with the teeth 13 of the day wheel 10 during the normal hand movement operation of the clock 100. Even when the wheel 10 is left in a meshed state, the elastic piece 27 itself bends (elasticity) due to the rotation of the wheel 20 to separate the pressing teeth 24 of the wheel 20 from the teeth 13 of the wheel 10. In addition to the bending of the elastic piece 27 itself, the elastic piece 27 is displaced by the engagement between the engaging portion 29 and the engaged portion 28 of the wheel 20.

Therefore, in the clock 100 of the present embodiment, the pressing teeth 24 of the day wheel 20 can be stably separated from the teeth 13 of the day wheel 10 regardless of the presence or absence of individual differences in the elastic deformation of the elastic piece portion 27. .. As a result, in the clock 100 of the present embodiment, the quick correction mechanism is in the state where the pressing teeth 24 of the day wheel 20 are in mesh with the teeth 13 of the day wheel 10 while the clock 100 is in the normal hand movement operation. Even when the wheel is left in a state of being meshed with 10, the day wheel 20 and the day wheel 10 can be reliably prevented from being damaged.

In the day wheel 20 of the present embodiment, as shown in FIG. 8, the pressing tooth 24 is greatly bent rearward in the rotation direction R as compared with the natural state before the pressing tooth 24 is separated from the tooth 13. , The pressing tooth 24 comes into contact with the tooth 21 (auxiliary pressing tooth 23) formed immediately after the rotation direction R.

Therefore, during the predetermined rotation period until the pressing tooth 24 is separated from the tooth 13 as shown in FIG. 9, the day wheel 20 holds the tooth 13 in a state where the pressing tooth 24 and the auxiliary pressing tooth 23 are integrated. Press from behind the rotation direction R.

Since the auxiliary pressing tooth 23 is formed on the main body portion of the wheel 20 where almost no bending occurs, the structure in which the pressing tooth 24 and the auxiliary pressing tooth 23 integrally press the tooth 13 is in the rotation direction R. Compared with the structure in which the teeth 13 are pressed only by the pressing teeth 24 formed on the elastic piece portion 27 in which the bending occurs, the efficiency of transmitting torque from the wheel 20 to the wheel 10 can be improved.

Therefore, even if the date wheel 10 cannot be rotated only by the pressing teeth 24, when the pressing teeth 24 and the auxiliary pressing teeth 23 are integrally pressed to press the teeth 13, the pressing teeth 24 are teeth. The possibility of rotating the date wheel 10 before leaving 13 can be increased.

The clock 100 of the present embodiment applies the wheel according to the present invention to the wheel 20 that rotates the wheel 10, but the wheel according to the present invention is limited to the wheel 20. is not it.

That is, the turning wheel according to the present invention is not only a day turning wheel that rotates the day wheel, but also a day wheel (a car in which characters indicating the day of the week are displayed side by side in the circumferential direction) and a moon car (month (month (month)). Various information is displayed, such as a car with characters indicating (January-December) arranged side by side in the circumferential direction), a moon phase, a city display vehicle (a vehicle with characters indicating the city name displayed side by side in the circumferential direction), etc. It can also be applied to a turning wheel that rotates a display wheel.

Further, the clock according to the present invention can also be applied to a clock including such a display vehicle and a rotating wheel according to the present invention that rotates the display vehicle.

Further, the clock 100 and the day wheel 20 of the present embodiment exemplify a case where the day wheel 10 is left in a date correction state by an early correction mechanism using an external operating member as a cause of difficulty in rotating. The clock and the wheel according to the invention are not limited to the problem when the display wheel is difficult to rotate due to the above-mentioned causes.

That is, the movement of the watch including the display wheel may be stored and transported, for example, with the display wheel covered with a cushioning material such as a sponge. At this time, the display wheel is pressed by the cushioning material and does not rotate, but the wheel moves to rotate the display wheel, and excessive torque may be applied to the wheel to damage it.

The clock and the wheel according to the present invention are subject to the subject of the present invention even when the display vehicle is difficult to rotate due to the above-mentioned causes, or when the display vehicle is difficult to move due to factors such as the accuracy of the display vehicle and the accuracy of assembly. handle.

In the clock 100 and the wheel 20 of the above-described embodiment, the engaged portion 28 is formed at the tip of the first elastic piece 26, and the engaging portion 29 is a tooth in front of the pressing tooth 24 in the rotation direction R. It is formed corresponding to 21, and has a structure in which the elastic piece portion 27 is pulled forward in the rotation direction R in a state where the engaging portion 29 is engaged with the engaged portion 28 by the rotation of the rotating wheel 20. be.

However, the clock and the wheel according to the present invention may have a structure in which the elastic piece portion 27 is pushed forward in the rotation direction R while the engaging portion 29 is engaged with the engaged portion 28.

FIG. 10 is a plan view showing a modified example of the day wheel 20. The illustrated wheel 20 is a modification of the wheel 20 shown in FIG. 4, and is an embodiment of the wheel according to the present invention.

The illustrated day wheel 20 has the same basic configuration (structure in which the pressing teeth 24 are formed at the tip of the elastic piece portion 27) as the day wheel 20 shown in FIG. 4, but the engaged portion. 28 is formed between the fixed end 26b and the tip 26a of the first elastic piece 26, not the tip of the first elastic piece 26.

The engaged portion 28 is an intermediate portion in the longitudinal direction of the first elastic piece 26 so that the first elastic piece 26 is easily bent when the engaging portion 29 of the wheel 20 and the engaged portion 28 are engaged. It is preferably formed on the tip 26a side of the 26c.

Then, the engaging portion 29 that engages with the engaged portion 28 corresponds to the teeth 21 that are not in front of the pressing tooth 24 in the rotation direction R but behind in the rotation direction R, and is in the rotation direction R of the engaged portion 28. It is formed at the rear, apart from the outside in the radial direction.

In the modified example in which the engaged portion 28 and the engaging portion 29 are formed in this way, as the rotation of the wheel 20 progresses, the elastic piece portion 27 flexes backward in the relative rotation direction R. Then, the deflection of the day wheel 20 in the radial direction becomes large. As a result, the engaged portion 28 formed in the intermediate portion of the first elastic piece 26 is naturally formed so as to be separated from the engaged portion 28 rearward in the rotational direction R and outward in the radial direction. It approaches the engaging portion 29 relatively from the front in the rotation direction R and from the inside in the radial direction.

After that, the engaged portion 28 and the engaging portion 29 are in contact with each other and engaged with each other, and the engaging portion 29 is engaged with the engaged portion 28 by further rotation of the wheel 20 in the rotation direction R. The elastic piece portion 27 is pushed forward in the rotation direction R.

Then, mainly due to the inward bending of the first elastic piece 26 in the radial direction, the entire second elastic piece 25 is displaced inward in the radial direction, and the pressing teeth formed at the tip of the second elastic piece 25. The 24 is displaced inward in the radial direction, and the radius r2 from the center C2 to the pressing tooth 24 becomes equal to or less than the distance from the center C2 to the tooth 13.

As a result, the pressing tooth 24 escapes inward in the radial direction from the tooth 13 pressing the pressing tooth 24 forward, overtakes the tooth 13, and exits in front of the rotation direction R.

Since the reaction force that presses the front tooth 13 disappears, the pressing tooth 24 is restored to the natural state before bending by the elastic force generated by the bending.

As described above, the watch 100 having the day wheel 20 of the modified example is in a state where the pressing teeth 24 of the day wheel 20 are in mesh with the teeth 13 of the day wheel 10 during the normal hand movement operation of the watch 100. Even when the quick correction mechanism is left in a state of being engaged with the sun wheel 10, the elastic piece 27 due to the rotation of the sun wheel 20 prevents the pressing teeth 24 of the wheel 20 from being separated from the teeth 13 of the wheel 10. Not only by bending (elastic deformation) of itself, but in addition to the bending of the elastic piece 27 itself, the elastic piece 27 due to the engagement between the engaging part 29 of the wheel 20 and the engaged part 28 Displacement is also performed.

Therefore, in the clock 100 having the day wheel 20 of the modified example, the pressing teeth 24 of the day wheel 20 are stabilized from the teeth 13 of the day wheel 10 regardless of the presence or absence of individual differences in the elastic deformation of the elastic piece portion 27. It can be separated. As a result, the clock 100 having the day wheel 20 of the modified example is in a state where the pressing teeth 24 of the day wheel 20 are in mesh with the teeth 13 of the day wheel 10 during the normal hand movement operation of the clock 100. Even when the correction mechanism is left in a state of being meshed with the day wheel 10, damage to the day wheel 20 and the day wheel 10 can be reliably prevented.

10-day wheel 13 teeth 20-day wheel 21 teeth 24 pressing teeth 27 elastic piece 28 engaged part 29 engaged part 100 clock C1, C2 center R rotation direction r1, r2 radius

Claims (5)

It is a turning wheel that presses and rotates the teeth of the display wheel by rotation.
A pressing portion that presses the tooth in the rotation direction of the display wheel is formed on the outer portion farthest from the center of rotation, and an engaged portion is formed on the inner portion that is closer to the center than the pressing portion. A flexible elastic piece and an engaging portion formed apart from the engaged portion and engaged with the engaged portion by bending of the elastic piece.
When the display wheel does not rotate even if the pressing portion presses the teeth due to the rotation of the wheel, the elastic piece is bent according to the rotation of the wheel.
The engaging portion engages with the engaged portion of the elastic piece portion that has been bent, the elastic piece portion is bent inward in the radial direction according to the rotation of the wheel, and the pressing portion is pressed. A wheel that separates from the teeth. The pressing portion is formed so as to be separated from the pressing portion behind the rotation direction of the turning wheel, and is in contact with the pressing portion of the elastic piece portion bent by the rotation of the turning wheel from the rear in the rotation direction. The turning wheel according to claim 1, further comprising an auxiliary pressing portion for pressing the display wheel together with the portion. The elastic piece portion is integrally formed with a first elastic piece that bends inward in the radial direction and a second elastic piece that extends outward in the radial direction from the first elastic piece and bends in the rotational direction of the wheel. ,
The pressing portion is formed at the tip of the second elastic piece, and is formed.
The wheel according to claim 1 or 2, wherein the engaged portion is formed at the tip of the first elastic piece. The elastic piece portion is integrally formed with a first elastic piece that bends inward in the radial direction and a second elastic piece that extends outward in the radial direction from the first elastic piece and bends in the rotational direction of the wheel. ,
The pressing portion is formed at the tip of the second elastic piece, and is formed.
The wheel according to claim 1 or 2, wherein the engaged portion is formed between the fixed end and the tip of the first elastic piece. A clock comprising a display wheel and a wheel according to any one of claims 1 to 4 for rotating the display wheel.

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