Timepiece

Abstract

To provide a timepiece which can prevent breakage of a supporting structure or displacement of a hand due to impact.SOLUTION: A timepiece (10) according to an embodiment includes: a first timepiece (a sub-hand 21); a first magnetic body (a driven magnet 32) fixed to the first hand (the sub-hand 21); a second magnetic body (a driving magnet 43) facing the first magnetic body (the driven magnet 32); a first shaft (40) fixed to the second magnetic body (the driving magnet 43); a wheel row mechanism (23) including a first rotary vehicle (a gear 42 for a sub-hand) which works with the first shaft (40); and a regulation member (24) facing the second magnetic body (the driving magnet 43) through the first magnetic body (the driven magnet 32).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a watch. [Background technology]

[0002] 2. Description of the Related Art In a timepiece such as a wristwatch, a timepiece module equipped with various parts is housed inside the case. The timepiece module includes a dial, hands such as minute and hour hands, a gear train mechanism, a drive source, etc.

[0003] In such a hand support structure, a mechanism using the magnetic force of magnets has been disclosed, which includes a driving magnet fixed to the tip of the fourth wheel axle and a driven magnet attached to the bottom of the second hand axis (see, for example, Patent Document 1). In a mechanism using the magnetic force of magnets in the hand support structure, if the watch receives an impact due to being dropped, the magnet may shift position or a repulsive force may be generated from the magnet, which may cause damage to the support structure or the hand to shift position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 50-46162 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of these problems, and has an object to provide a timepiece that can prevent damage to the support structure and displacement of the hands due to impact. [Means for solving the problem]

[0006] A timepiece according to one embodiment of the present invention comprises a first hand, a first magnetic body fixed to the first hand, a second magnetic body arranged opposite the first magnetic body, a first shaft fixed to the second magnetic body, a gear train mechanism including a first rotating wheel that moves in conjunction with the first shaft, and a regulating member arranged opposite the second magnetic body via the first magnetic body. Effect of the Invention

[0007] According to the present invention, damage to the support structure and displacement of the pointer due to impact can be prevented. [Brief description of the drawings]

[0008] [Figure 1] 1 is a plan view showing the configuration of a timepiece according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the configuration of the timepiece. [Diagram 3] 2 is a cross-sectional view showing the configuration of the hands and gear train mechanism of the timepiece. FIG. [Figure 4] 2 is an explanatory diagram showing the configuration of the hands and part of the gear train mechanism of the timepiece. FIG. [Diagram 5] FIG. 2 is an explanatory diagram showing the configuration of a magnetic body of the clock. [Figure 6] 4 is an explanatory diagram of a holding structure for the hands and part of the gear train mechanism of the timepiece. FIG. [Figure 7] FIG. 11 is an explanatory diagram showing the configuration of a part of the hands and wheel train mechanism of a timepiece according to a second embodiment. [Figure 8] FIG. 4 is an explanatory diagram of a holding structure of the watch. [Figure 9] FIG. 4 is an explanatory diagram of a holding structure of the watch. [Figure 10] FIG. 11 is an explanatory diagram showing the configuration of a part of the hands and wheel train mechanism of a timepiece according to a third embodiment. [Figure 11] 13 is an explanatory diagram of a holding structure for the hands and part of the gear train mechanism of a timepiece according to a third embodiment. FIG. [Figure 12] FIG. 13 is an explanatory diagram showing the configuration of a part of the hands and wheel train mechanism of a timepiece according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] The configuration of a timepiece 10 according to a first embodiment of the present invention will be described below with reference to Figs. 1 to 6. Fig. 1 is a plan view showing the configuration of the timepiece according to the first embodiment, and Fig. 2 is a cross-sectional view showing the configuration of the timepiece. Fig. 3 is a cross-sectional view showing the configuration of the hands and train wheel mechanism of the timepiece. Fig. 4 is an explanatory diagram showing the configuration of part of the train wheel mechanism, and Fig. 5 is an explanatory diagram showing the configuration of the magnetic body of the timepiece. Fig. 6 is an explanatory diagram of the holding structure. In each figure, the configuration is shown generally, enlarged, reduced, or omitted as appropriate.

[0010] As shown in Figures 1 and 2, the watch 10 is, for example, a wristwatch, and comprises a case 11 that forms the outer shell, a watch module 13 provided within the case 11, a watch crystal 15 that covers the front side of the watch module 13, a back cover 16 that covers the back side of the watch module 13, and one or more switches 17 arranged on the outer periphery of the case 11.

[0011] The case 11 includes a circular first case 11a and a second case 11b disposed outside the first case 11a.

[0012] The first case 11a is formed in an annular shape, and has a circular storage space therein for storing the timepiece module 13 and the like.

[0013] Dial 20 of watch module 13 is disposed in the upper opening of first case 11a. Reinforcing member 18a and parting member 18b are disposed on the outer periphery of dial 20, on the inner periphery of first case 11a. A groove is formed on the back surface (the other surface) of first case 11a, and waterproof ring 11d that creates an airtight seal between it and back cover 16 is attached to this groove.

[0014] The second case 11b is provided on the outer periphery of the first case 11a and is fixed to the first case 11a by connecting members such as screws 11c.

[0015] The timepiece module 13 is housed in the storage space of the first case 11a. The timepiece module 13 includes a dial 20, an antimagnetic plate 60, a minute hand 21 which is a first hand, an hour hand 22 which is a second hand, a gear train mechanism 23 which serves as a power transmission section, a regulating member 24, and a drive source 26. Depending on the drive system, the timepiece module 13 may further include various components necessary for the operation of the timepiece, such as a battery, a circuit board on which electronic components such as an IC and an antenna are mounted, etc.

[0016] The dial 20 is configured in a disk shape and is disposed in the upper portion of the accommodation space of the first case 11a. The dial 20 has a through hole 20a in the center into which the first shaft 40 and the second shaft 45 that constitute a part of the gear train mechanism 23 are inserted. A parting member 18b on which various hour characters 14c are provided is disposed on the outer periphery of the front surface, which is one side of the dial 20.

[0017] The minute hand 21 is equipped with a first hand body 31 configured to have a predetermined width and length. A driven magnet 32 ​​is fixed to the minute hand 21 as a first magnetic body.

[0018] The first needle body 31 is configured, for example, in the shape of a long, thin plate. A first needle hole 31a, which is a through hole, is formed at the base end of the rotating first needle body 31. A circular ring-shaped driven magnet 32 ​​of the minute hand 21 is fixed to the first needle hole 31a of the first needle body 31. The first needle body 31 is provided on the dial 20 in the storage space so as to be rotatable about a rotation axis C1.

[0019] The first hand body 31 is connected to the drive source 26 via the gear train mechanism 23, and rotates so that its longitudinal direction faces the direction corresponding to the time to be displayed.

[0020] As shown in Figures 4 and 5, the driven magnet 32 ​​is configured, for example, in a circular ring shape having an axial hole 32a (hole portion) in the center. The driven magnet 32 ​​is configured of a ferromagnetic material such as samarium cobalt. The driven magnet 32 ​​is magnetized in the radial direction and has two different poles in the circumferential direction. For example, one side is polarized as an S pole and the other side is polarized as an N pole with respect to a radial polarization line L1 that passes through the center. A support member 46, which is a part of the gear train mechanism 23, is inserted into the axial hole 32a of the driven magnet 32, and the driven magnet 32 ​​is rotatably supported by the support member 46.

[0021] Train wheel mechanism 23 includes drive source 26 and a plurality of gear members that are appropriately arranged according to the arrangement of minute hand 21 and hour hand 22. As an example, train wheel mechanism 23 includes at least minute hand gear 42 as a first rotating wheel having a first shaft 40 that engages with minute hand 21, and hour hand gear 44 as a second rotating wheel having a second shaft 45 that engages with hour hand 22. Train wheel mechanism 23, together with drive source 26, constitutes a movement that moves hands 21, 22.

[0022] The minute hand gear 42 is a gear member known as a center wheel and has a first shaft 40 extending along the rotation axis C1 at its rotation center. The minute hand gear 42 is rotated by the drive source 26 to rotate the minute hand 21.

[0023] The first shaft 40 includes a shaft body 41 and a support member 46 provided at the tip of the shaft body 41. The first shaft 40 is fixed to the center of rotation of the minute hand gear 42. Depending on the arrangement of other members, the first shaft 40 may be configured as a cylinder having a through hole in the center into which other shaft members can be inserted. The first shaft 40 may be provided integrally with the minute hand gear 42, or may be configured as a separate member. The first shaft 40 may be fixed to the minute hand gear 42, or may be configured to be linked to the minute hand gear 42 without being fixed thereto.

[0024] The shaft body 41 is a rod-shaped member extending in a predetermined first direction. A hole 41a is formed at the tip of the shaft body 41, into which the support member 46 is inserted and fixed. The hole 41a is, for example, a bottomed recess that opens toward the tip side of the shaft body 41, i.e., toward the front side of the watch 10. The support member 46 is inserted and fixed in the hole 41a.

[0025] The support member 46 is a shaft member having a smaller diameter than the shaft body 41. The support member 46 is inserted into and fixed in the hole portion 41a of the shaft body 41, and is supported coaxially with the shaft body 41.

[0026] The support member 46 is fixed to the shaft body 41 and fixes the driven magnet 32. The support member 46 is disposed in the axial hole 32a of the driven magnet 32 ​​and the axial hole 43a of the drive magnet 43. The support member 46 rotatably supports the driven magnet 32 ​​and restricts the radial movement of the driven magnet 32 ​​during rotation.

[0027] The support member 46 has, for example, a flange-shaped spacer 46a protruding in the outer circumferential direction at a predetermined location on the outer circumferential surface. The spacer 46a is a protrusion having a predetermined thickness, and by being interposed between the driven magnet 32 ​​and the driving magnet 43, it defines the axial gap between the driven magnet 32 ​​and the driving magnet 43. For example, the thickness dimension of the spacer 46a is set to a dimension that can ensure the necessary holding force by magnetism.

[0028] A driving magnet 43 as a second magnetic body is press-fitted and fixed to the support member 46 at a rear side of the spacer 46a, in other words, at a portion between the tip end surface of the shaft body 41 and the spacer 46a. Meanwhile, a driven magnet 32 ​​is rotatably attached to a front side of the spacer 46a, in other words, at a portion closer to the tip end than the spacer 46a. That is, the spacer 46a rotatably supports the driven magnet 32 ​​at a predetermined interval relative to the driving magnet 43, and regulates the radial position of the driven magnet 32.

[0029] An insertion hole 46b into which the fixing pin 24a of the regulating member 24 is inserted is formed at the tip of the support member 46. The fixing pin 24a of the regulating member 24 is inserted and fixed in the insertion hole 46b. The axial dimension of the support member 46 is configured such that the tip surface of the front end of the support member 46 protrudes slightly toward the front side beyond the tip surface of the front end of the driven magnet 32.

[0030] 4, the driving magnet 43 is configured, for example, in a circular ring shape having an axial hole 43a in the center, and is disposed coaxially with the driven magnet 32. The driven magnet 32 ​​is made of a ferromagnetic material such as samarium cobalt. The driving magnet 43 is disposed facing the rear side of the driven magnet 32 ​​in the axial direction, with a spacer 46a in between.

[0031] The driving magnet 43 is magnetized in the radial direction and has two different poles in the circumferential direction. For example, one side is polarized as an S pole and the other side is polarized as an N pole with respect to a radial polarization line L1 passing through the center. The driving magnet 43 is pressed and fixed to the shaft body 41 by a spacer 46a of a support member 46 that is press-fitted and fixed to the shaft body 41 of the first shaft 40. The driving magnet 43 rotates together with the first shaft 40. A support member 46 that is a part of the first shaft 40 of the gear train mechanism 23 is disposed in the shaft hole 43a of the driving magnet 43. For example, the driving magnet 43 is fixed to the first shaft 40 by fitting or bonding. As a result, the driving magnet 43 is fixed to the minute hand gear 42.

[0032] The driving magnet 43 is disposed opposite the driven magnet 32, and holds the driven magnet 32 ​​in a rotational position where their respective S and N poles attract each other. Therefore, in a stationary state, the driven magnet 32 ​​and minute hand 21 are held in the rotational direction in which the S and N poles of the magnets attract each other, and during normal hand operation of the timepiece, the minute hand 21 rotates in synchronization with the rotation of the minute hand gear 42. In other words, the driving magnet 43 and the driven magnet 32 ​​form a magnetic holding structure 30 as part of the gear train mechanism 23.

[0033] The hour hand 22 includes a second hand body 47 that is configured to have a predetermined width and length. For example, the second hand body 47 is configured to be shorter than the first hand body 31 and has a predetermined shape.

[0034] The second hand body 47 is, for example, configured in the shape of a long, thin plate, and has a second pinhole 47a at its base end for rotation. A second shaft, which is a part of the gear train mechanism 23, is fixed to the second pinhole 47a of the second hand body 47. The second hand body 47 is rotatably provided on the dial 20 in the accommodation space. The second hand body 47 is connected to the drive source 26 via the gear train mechanism 23, and rotates so that its longitudinal direction faces the direction corresponding to the time.

[0035] The hour hand gear 44 is a gear member known as a central wheel, and has a second shaft 45 extending along the rotation axis C1 as its rotation center. The hour hand gear 44 is rotated by the drive source 26, thereby rotating the hour hand 22.

[0036] The second shaft 45 is a hollow rod-shaped member extending in a predetermined first direction. The second shaft 45 is configured in a cylindrical shape having a through hole 45a in the center into which the first shaft 40 can be inserted. The second shaft 45 is rotatably attached to the outer periphery of the first shaft 40. The second shaft 45 is integrally provided or fixed to the axial center of the hour hand gear 44.

[0037] The second needle body 47 is press-fitted and fixed to the tip portion of the second shaft 45. That is, the second needle body 47 rotates as the second shaft 45 rotates.

[0038] For example, the minute hand 21, the first shaft 40, the hour hand 22, and the second shaft 45 are made of a non-magnetic material.

[0039] 3, the restricting member 24 is a retaining member that integrally includes a fixing pin 24a and a cover portion 24b as a restricting portion. The restricting member 24 is formed of, for example, a metal material. The restricting member 24 is made of, for example, a non-magnetic material such as brass.

[0040] The fixing pin 24a is a cylindrical shaft body having an outer diameter slightly larger than an insertion hole 46b formed in the support member 46 at the tip end of the first shaft 40, and is press-fitted and fixed into the insertion hole 46b of the support member 46. In other words, the restricting member 24 is connected to the first shaft 40 via the support member 46.

[0041] The cover portion 24b is configured in a disk shape. The cover portion 24b is provided integrally with one end portion that is the base end side in the insertion direction of the fixing pin 24a. For example, the cover portion 24b is configured in a circular plate shape that is larger than the outer shape of the driven magnet 32. The cover portion 24b is disposed opposite the driving magnet 43 via the driven magnet 32. The cover portion 24b is disposed on the front side of the driven magnet 32 ​​and regulates the movement of the driven magnet 32 ​​to the front side. That is, since the cover portion 24b is fixed to the support member 46 at the tip end of the first shaft 40 via the fixing pin 24a, when the driven magnet 32 ​​moves in the axial direction, the cover portion 24b interferes with the driven magnet 32, thereby becoming a regulating portion that regulates the position of the driven magnet 32.

[0042] The cover portion 24b is positioned with its back surface (the other surface) facing the tip surface of the support member 46. That is, the axial dimension of the support member 46 is configured such that the tip surface of the front end of the support member 46 protrudes slightly toward the front side beyond the tip surface of the front end of the driven magnet 32, and therefore the cover portion 24b is disposed facing the front surface of the driven magnet 32 ​​with a small gap therebetween. Therefore, the cover portion 24b is disposed facing at a position that does not interfere with the rotation of the driven magnet 32.

[0043] The magnetic shield 60 is disposed adjacent to the dial 20 on the opposite side of the minute hand 21, which is the first hand, and the hour hand 22, which is the second hand, and reduces the effect of magnetic flux from the drive magnet 43 and the driven magnet 32 ​​on the timepiece module 13. The magnetic shield 60 is configured in a circular plate shape centered on the through-hole 20a of the dial 20. The magnetic shield is formed, for example, from SPCC (Cold-reduced carbon steel sheets and strips) or the like. The material of the magnetic shield 60 is not limited to SPCC as long as it can easily collect a magnetic field. For example, the magnetic shield 60 may be made of permalloy or the like.

[0044] The driving source 26 includes one or more driving mechanisms. Various driving mechanisms, such as a motor or a spring mechanism, can be used as the driving mechanism depending on the drive system of the timepiece 10. A configuration in which one driving mechanism is used to drive the multiple hands 21, 22 by transmitting power via the wheel train mechanism 23, or a configuration in which a driving mechanism is provided for each of the hands 21, 22, may be used.

[0045] The crystal 15 is a so-called windshield, and is made of a light-transmitting material in a transparent, circular shape. The crystal 15 is supported on the parting member 18b at the inner periphery of the upper opening of the first case 11a, and covers the front side of the dial 20. The crystal 15 is attached to the inner periphery of the first case 11a, for example, via a packing 19.

[0046] When an operator presses the switch 17, the switch 17 switches modes of the clock module 13, adjusts the time, and so on.

[0047] In the timepiece 10 configured as above, the minute hand 21 and a part of the gear train mechanism 23 are connected by the holding force of the magnets 32, 43. In addition, the driven magnet 32 ​​of the minute hand 21 is rotatably supported by the support member 46 of the first shaft 40. This makes it possible to prevent the rotation of the minute hand 21 caused by an external impact from being transmitted to the first shaft 40. For example, if the timepiece 10 is subjected to a lateral impact due to being dropped, a moment in the rotation direction is generated in the minute hand 21, but the minute hand gear 42 is not subjected to a rotational torque greater than the binding force of the magnetic forces of the drive magnet 43 and the driven magnet 32. For this reason, even if the minute hand 21 rotates due to an impact when the minute hand 21 is applied, the first shaft 40 is prevented from rotating, so that the inside of the movement can be prevented from being destroyed by the rotation of the first shaft 40 due to an external force. Furthermore, damage to the gears due to an external force and damage to the movement due to slippage or dislocation of the press-fitted fixed part of the hand can also be prevented. Furthermore, if a motor is used as the drive source 26, deviations in the time display due to loss of synchronism of the motor magnet can also be prevented.

[0048] Furthermore, by providing the timepiece 10 with the regulating member 24 having a regulating portion facing the driving magnet 43 across the driven magnet 32, the magnet 32 ​​can be prevented from coming loose from the shaft 41 when an impact is applied. That is, for example, in a stationary state, the S and N poles of the magnets are arranged opposite each other, and the driving magnet 43 and the driven magnet 32 ​​are arranged opposite each other and attract each other, thereby holding the driven magnet 32 ​​in place, but if an impact causes the positional relationship of the magnets 32 and 43 to shift and bring the repulsive poles into a positional relationship facing each other, the repulsive force of the magnets may cause the driven magnet 32 ​​to come loose from the first shaft 40, and a force may be applied in the direction of floating the needle body. Even in such a case, by arranging the cover portion 24b of the regulating member 24 opposite the front side of the driven magnet 32, the movement of the magnet 32 ​​can be regulated and the magnet can be maintained in a held state.

[0049] Therefore, in the timepiece 10 according to the above embodiment, even if an impact causes the relative positions of the drive magnet 43 and the driven magnet 32 ​​to shift, the magnetic force returns the positional relationship between the drive magnet 43 and the driven magnet 32 ​​in the rotational direction to their original position, so that the minute hand 21 returns to the position it was in before the impact was applied, and the time display is adjusted. Also, by arranging the driven magnet 32 ​​and the drive magnet 43 opposite each other in the axial direction, they do not interfere with each other's rotational movement.

[0050] Furthermore, the support member 46 provided on the first shaft 40 rotatably supports the driven magnet 32 ​​in a space-saving manner and restricts radial positional deviation. Also, the spacer 46a interposed between the driven magnet 32 ​​and the driving magnet 43 creates a gap between the driven magnet 32 ​​and the driving magnet 43 in the axial direction. In other words, since friction caused by contact between the driven magnet 32 ​​and the driving magnet 43 can be reduced, a configuration can be achieved in which the return of the minute hand 21 is not hindered by frictional force caused by contact between the driven magnet 32 ​​and the driving magnet 43.

[0051] The above-described embodiments are merely examples and do not limit the scope of the invention.

[0052] For example, in the above embodiment, the restricting member 24 having the fixing pin 24a and the cover portion 24b integrally therewith is exemplified, but the configuration of the restricting member 24 is not limited to the above example.

[0053] The restricting member 24 may be configured to prevent the magnet from coming off by narrowing the distance between the magnet to be restricted and the opposing member.

[0054] In the above embodiment, an example was shown in which the minute hand 21 and the hour hand 22 were provided as the hands, but this is not limited thereto, and other hands such as a second hand may also be provided.

[0055] In addition, in the above embodiment, an example was shown in which a holding structure 30 using magnets 32, 43 is interposed in the support structure for the minute hand 21, but this is not limited to this, and a configuration in which a holding structure using a magnet is interposed may be applied as a support structure for the hour hand, second hand, and other pointers.

[0056] [Second embodiment] The regulating member 24A according to the second embodiment will be described below with reference to Figs. 7 to 9. Fig. 7 is an explanatory diagram showing the configuration of the hands and part of the gear train mechanism of the timepiece according to the second embodiment. Figs. 8 and 9 are explanatory diagrams of the retaining structure 30. In this embodiment, the regulating member 24A has an annular cover portion 24c. The rest of the configuration is the same as that of the timepiece 10 according to the first embodiment, so the description will be omitted.

[0057] As shown in FIG. 7, the regulating member 24A has a washer-shaped cover portion 24c fixed to the outer periphery of the support member 46 at the tip of the first shaft 40 as a regulating portion. For example, the cover portion 24c is a washer member formed in a circular flat plate shape and having a circular hole 24d in the center. The regulating member 24A is made of a non-magnetic material. The cover portion 24c is connected and fixed to the tip of the support member 46 by press-fitting the tip of the support member 46 into the central hole 24d. That is, the regulating member 24A is connected and fixed to the first shaft 40 via the support member 46. The upper surface of the regulating member 24A is at approximately the same height as the upper surface of the support member 46. The cover portion 24c is disposed opposite the driving magnet 43 with the driven magnet 32 ​​in between in the axial direction, and regulates the movement of the driven magnet 32 ​​to the front side.

[0058] That is, for example, in a stationary state as shown in Fig. 8, the S pole and N pole of the magnets are arranged facing each other, and the driving magnet 43 and the driven magnet 32 ​​are arranged facing each other and attract each other, thereby holding the driven magnet 32. On the other hand, as shown in Fig. 9, if an impact causes the positional relationship between the driven magnet 32 ​​and the driving magnet 43 to shift and the repulsive poles become opposed to each other, the repulsive force of the magnets may cause the driven magnet 32 ​​to come off the first shaft 40, and a force may be applied in the direction in which the needle body floats.

[0059] In the watch 10 of this embodiment, by providing a regulating member 24A having a retaining portion that faces the driving magnet 43 across the driven magnet 32, it is possible to prevent the magnet 32 ​​from coming off the first shaft 40 in the event of an impact, and the magnet can be maintained in a held state.

[0060] Therefore, in the watch 10 of the above embodiment, even if an impact is applied and the relative positions of the drive magnet 43 and the driven magnet 32 ​​are shifted, the magnetic force returns the positional relationship between the drive magnet 43 and the driven magnet 32 ​​in the rotational direction to its original position, so that the minute hand 21 returns to the position it was in before the impact was applied, and the time display is adjusted.

[0061] [Third embodiment] Hereinafter, the restricting member 24B according to the third embodiment will be described with reference to Fig. 10 and Fig. 11. The restricting member 24B shown in Fig. 10 is a cap member integrally having a cover portion 24e arranged to face the front side of the driven magnet 32 ​​and a peripheral wall portion 24f formed on the outer periphery of the cover portion 24e.

[0062] The cover part 24e is formed in a circular hole 24g in the center and is configured in a circular flat plate shape. The tip of the support member 46 is inserted into the central hole 24g of the cover part 24e, arranged, and fixed. The diameter of the central hole 24g of the cover part 24e is larger than the diameter of the support member 46. Therefore, there is a slight gap between the cover part 24e and the support member 46. The regulating member 24B is simply placed on the driven magnet 32 ​​and is not fixed by press-fitting or the like. However, since the regulating member 24B is made of a magnetic material and is attracted to the driven magnet 32, the regulating member 24B will not come off even if the display surface of the timepiece 10 is reversed from the top to the bottom. In other words, the regulating member 24B is fixed to the first shaft 40 via the support member 46. The cover part 24e has a circular outer shape larger than the outer shape of the driven magnet 32. The cover portion 24e is disposed opposite the drive magnet 43 with the driven magnet 32 ​​in between in the axial direction, and restricts movement of the driven magnet 32 ​​towards the front side. That is, since the cover portion 24e is fixed to the support member 46 at the tip end of the first shaft 40, when the driven magnet 32 ​​moves in the axial direction, the cover portion 24e interferes with the driven magnet 32, thereby functioning as a restricting portion that restricts the position of the driven magnet 32 ​​and prevents it from coming off.

[0063] The peripheral wall portion 24f is a wall-like member extending from the outer periphery of the circular cover portion 24e to the rear side, and is disposed opposite the outer periphery of the front side of the driven magnet 32.

[0064] The regulating member 24B is fixed to the support member 46 by press-fitting from the front sides of the support member 46 and the driven magnet 32, and is fitted over the front surface, which is one face side of the driven magnet 32, and the outer periphery of the front side.

[0065] The cover portion 24e of the regulating member 24B is configured so that the sum of the thickness dimension T1 of the cover portion 24e and the thickness dimension T2 of the driven magnet 32 ​​is larger than the distance D2 from the top surface of the cover portion 24e to the other side of the watch crystal 15, which is the opposing member. In other words, the dimensions are set so that the range of movement of the driven magnet 32 ​​when it moves in the removal direction is smaller than the depth dimension at which the driven magnet 32 ​​engages with the first shaft 40.

[0066] In other words, the axial dimension D2 of the gap between the front end of the regulating member 24B and the watch crystal 15, which is the opposing member arranged opposite the front side of the regulating member 24B, is smaller than the depth dimension D1 from the base end of the driven magnet 32 ​​to the tip end of the support member 46 of the first shaft 40.

[0067] In other words, when the driven magnet 32 ​​is fixed to the first shaft 40, the dimension D1 of the insertion depth, which is the distance from the tip of the support member 46, which is the tip of the first shaft 40, to the base end of the driven magnet 32, is configured to be larger than the dimension D2 of the gap between the regulating member 24 and the watch crystal 15. Therefore, the dimensions are set so that the distance by which the cover part 24e moves axially toward the tip side until it is removed from the first shaft 40 is smaller than the distance by which it abuts against the watch crystal 15, which is the opposing member.

[0068] Therefore, when the regulating member 24B is positioned in the correct position, the insertion depth dimension D1 of the first shaft 40 is greater than the distance D2 to the opposing member, the watch crystal 15, so that if the driven magnet 32 ​​moves in the axial direction in a direction that would cause it to come off as shown in Figure 11, it will interfere with the opposing member before coming off the first shaft 40, thereby preventing the magnet from coming off.

[0069] In this embodiment, the cover portion 24e is also disposed opposite the driving magnet with the driven magnet 32 ​​in the axial direction, and the movement of the driven magnet 32 ​​toward the front side is restricted, thereby preventing the driven magnet 32 ​​from falling out. In addition, the size of the gap between the opposing member in the axial direction is made smaller than the depth dimension at which the driven magnet 32 ​​engages with the first shaft 40, thereby preventing the driven magnet 32 ​​from falling out. For example, even if the cover portion 24e moves in the direction of falling out, the magnet 32 ​​can be held so as not to come off the tip of the first shaft 40. Therefore, even if an impact is applied and the relative positions of the driving magnet 43 and the driven magnet 32 ​​are displaced, the magnetic force returns the positional relationship between the driving magnet 43 and the driven magnet 32 ​​in the rotational direction to the original position, so that the minute hand 21 returns to the position before the impact is applied, and the time display is adjusted.

[0070] [Fourth embodiment] Next, a timepiece 100 according to a fourth embodiment will be described with reference to Fig. 12. The timepiece 100 according to this embodiment includes a second hand 25 as a third pointer, and a second hand gear 49 as a third rotating wheel having a third shaft 48 and driving the second hand 25 as part of the train wheel mechanism 23. In this embodiment, the support member 46 is configured in a cylindrical shape having a hollow portion. In this embodiment, a support member 51, which is part of the third shaft 48 that supports the second hand 25, serves as a regulating member. The other configurations are the same as those of the first embodiment.

[0071] The second hand gear 49 is a gear member known as a second wheel and has a third shaft 48 extending along the rotation axis C1 as its rotation center. The second hand gear 49 is rotated by the drive source 26 to rotate the second hand 25.

[0072] The third shaft 48 includes a rod-shaped shaft body 50 and a support member 51 provided at the tip of the shaft body 50 as a restricting member.

[0073] The shaft body 50 is disposed coaxially with the first shaft 40 and the second shaft 45. In this embodiment, the shaft body 41 of the first shaft 40 disposed at the center of the second shaft 45 is configured in a cylindrical shape having a hollow portion 41c, and the rod-shaped shaft body 50 is disposed in the hollow portion 41c.

[0074] The support member 51 has a cylindrical fixing portion 51a which is press-fitted and fixed to the second hand 25, and a restricting portion 51b which is arranged to face the front side of the driven magnet 32. The support member 51 is fixed to the second hand 25. The restricting portion 51b is configured in a flange shape in which a part of the outer circumferential surface of the cylindrical fixing portion 51a projects radially outward. The restricting portion 51b is arranged between the second hand 25 and the driven magnet 32 ​​in the axial direction. The restricting portion 51b is arranged to face the front side of the driven magnet 32, and constitutes a retaining member which restricts the position of the driven magnet 32 ​​by interfering with the driven magnet 32 ​​when the driven magnet 32 ​​moves to the front side.

[0075] Second hand 25 is positioned on the front side of minute hand 21 and hour hand 22, and rotates together with second hand gear 49. In order to suppress the effects of magnetism, second hand 25, shaft body 50 of third shaft 48, and support member 51 are made of a non-magnetic material that is hard enough to withstand the load of the press-in when fixing second hand 25.

[0076] In this embodiment, the support member 46 of the first shaft 40 is configured in a cylindrical shape into which the shaft body 50 of the third shaft 48 can be inserted, and is fixed to the hollow portion of the first shaft 40. The support member 46 includes a spacer 46a having a step that rotatably holds the driven magnet 32. The other configurations are configured similarly to the first embodiment.

[0077] This embodiment also has the same effect as the first embodiment. That is, in the timepiece 100, by providing a support member 51 having a restricting portion 51b that faces the driving magnet 43 with the driven magnet 32 ​​in between, it is possible to prevent the magnet 32 ​​from coming off the shaft body 41 when an impact is applied. Therefore, the movement of the magnet 32 ​​can be restricted by the restricting portion 51b arranged opposite the front side of the driven magnet 32 ​​as part of the support member that supports the second hand 25, and the holding state can be maintained. In addition, the minute hand 21 and the gear train mechanism 23 are connected by the holding force of the magnet, so that the transmission of external impacts can be suppressed. In addition, by using non-magnetic materials for the second hand 25, the shaft body 50 of the third shaft 48, and the support member 51, the influence of magnetic force can be suppressed, and the hands can operate normally.

[0078] The features of the above-mentioned embodiments may be combined. For example, in the timepiece 10 according to the first embodiment, the axial dimension of the gap between the regulating member 24 and the opposing member, the watch crystal 15, can be made smaller than the depth dimension at which the regulating member 24 engages with the first shaft 40, i.e., the distance from the base end of the regulating member 24 to the tip of the support member 46 on the tip side of the first shaft 40, thereby improving the prevention effect.

[0079] In the above embodiment, the second hand 25, which is the third pointer, and the third shaft 48 are made of a non-magnetic material, but this is not limited to the above. Also, instead of or in addition to the second hand 25 and the third shaft 48, other members may be made of a non-magnetic material. For example, at least one of the minute hand 21, the first shaft 40, the hour hand 22, the second shaft 45, the second hand 25, and the third shaft 48, or other peripheral members may be made of a non-magnetic material.

[0080] In addition, in each of the above embodiments, an example has been shown in which a holding structure using magnets 32, 43 is interposed in the support structure for minute hand 21, but this is not limited to this, and a configuration in which a holding structure using a magnet is interposed may be applied as a support structure for the hour hand, second hand, and other pointers.

[0081] For example, although the driving magnet 43 and the driven magnet 32 ​​are made of a hard magnetic material in the above example, the present invention is not limited to this. For example, one of them may be made of a soft magnetic material.

[0082] Although several embodiments of the present invention have been described, the present invention is encompassed within the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0083] 10. Clock 11. Case 11a…Case 11b…Case 11c...Bis 11d…Waterproof ring 13...Clock module 14c…hour character 15...Clock glass 16…Case back 17…Switch 18a…Reinforcing member 18b... Trim material 19…Packing 20…Dial 20a...Through hole 21...Minute hand (first pointer) 22...Hour hand 23…wheel train mechanism 24, 24A, 24B…Regulation members 24a…Fixed pin 24b, 24c, 24e...Cover part (regulating part) 24d, 24g…hole 24f...peripheral wall part 25...Second hand 26...Drive source 30...Retaining structure 31...Needle body 31a...needle hole 32...Driven magnet (first magnetic body) 32a…Shaft hole 40...1st axis 41...Shaft body 41a...hole 41c...Hollow part 42...Minute hand gear (first wheel, second wheel) 43...Drive magnet (second magnetic body) 43a…Shaft hole 44...Hour hand gear (hour wheel) 45…Second axis 45a...Through hole 46...Support member 46a…Spacer 46b…insertion hole 47…Needle body 47a…needle hole 48...Third axis 49…Second hand gear (fourth wheel) 50...Shaft 51...Support member 51a...Fixed part 51b…Regulatory Department 60...Antimagnetic plate 100…Clock C1…Rotation axis L1…Polarization line T1…Thickness dimension T2…Thickness dimension

Claims

1. The first guideline, a first magnetic body fixed to the first pointer; a second magnetic body disposed opposite the first magnetic body; a first shaft fixed to the second magnetic body; a gear train mechanism including a first rotating wheel interlocking with the first shaft; a restricting member disposed opposite the second magnetic body via the first magnetic body; A watch that is equipped with

2. The timepiece according to claim 1 , wherein the regulating member is fixed to the first shaft.

3. the second magnetic body holds the first magnetic body by magnetism, 2. The timepiece according to claim 1, wherein the first magnetic body and the second magnetic body are magnets configured in a circular shape and polarized in the circumferential direction of rotation.

4. 3. The timepiece according to claim 1, wherein the first magnetic body and the second magnetic body are arranged opposite each other in the axial direction.

5. The first magnetic body and the second magnetic body are configured in an annular shape having a hole at the center, the first shaft includes a shaft body, and a support member provided at a tip portion of the shaft body and disposed in the hole portion, the support member rotatably supporting the first magnetic body on the shaft body, and restricting radial movement of the first magnetic body in rotation; The timepiece according to claim 1 , wherein the regulating member is fixed to a tip end of the support member.

6. The watch as described in claim 5, wherein the regulating member comprises a cover portion arranged on one side of the first magnetic body, and a pin connected to the other side of the cover portion and fixed to the tip portion of the support member.

7. the regulating member is made of a non-magnetic material, is fixed to the first shaft, and has a regulating portion disposed on one surface side of the first magnetic body; The timepiece as described in claim 1, wherein the axial dimension of the gap between the regulating member and an opposing member arranged opposite the front side of the regulating member is smaller than the axial dimension from the base end of the first magnetic body to the tip end of the first shaft.

8. The second guideline is provided. the gear train mechanism includes a second rotating wheel having a second shaft to which the second pointer is fixed; The first shaft and the second shaft are arranged coaxially.

2. The watch according to claim 1.

9. Equipped with the third guideline, the train wheel mechanism includes a third rotating wheel having a third shaft to which the third pointer is fixed; The first shaft, the second shaft, and the third shaft are arranged coaxially.

9. The watch according to claim 8.

10. the first hand is a minute hand, the second hand or the third hand is an hour hand or a second hand, 10. The timepiece according to claim 9, wherein at least one of the first hand, the first shaft, the second hand, the second shaft, the third hand, and the third shaft is made of a non-magnetic material.

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