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 timepiece. [Background technology]

[0002] A timepiece such as a wristwatch houses a timepiece module equipped with various parts inside the case, such as a dial, hands such as minute and hour hands, a gear train mechanism, and a drive source.

[0003] In such a hand support structure, a mechanism using the magnetic force of magnets has been disclosed, which includes a drive 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 damage the support structure or cause 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 as its 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. [Effects 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 explanation of the drawings]

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

[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 schematically, 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 first case 11a having an annular shape and a second case 11b disposed outside the first case 11a.

[0012] The first case 11a is formed in a circular ring 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 placed in the upper opening of first case 11a. Reinforcing member 18a and parting member 18b are placed 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, which 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, a magnetic shield 60, a minute hand 21 serving as a first hand, an hour hand 22 serving as a second hand, a gear train mechanism 23 serving as a power transmission unit, 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 mounted with electronic components such as an IC and an antenna, etc.

[0016] The dial 20 is disc-shaped and is located at the top of the accommodation space of the first case 11a. The dial 20 has a through-hole 20a in its center, into which the first shaft 40 and second shaft 45 that form part of the gear train mechanism 23 are inserted. A parting member 18b on which various hour characters 14c are provided is located on the outer periphery of the surface, which is one side of the dial 20.

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

[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 accommodation space so as to be rotatable around 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 with an axial hole 32a (hole) in the center. The driven magnet 32 ​​is configured, for example, from 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 a radial polarization line L1 passing through the center as the boundary. A support member 46, which is 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 and 22.

[0022] The minute hand gear 42 is a gear member known as a center wheel and has, at its rotation center, the first shaft 40 extending along the rotation axis C1. The minute hand gear 42 is rotated by the drive source 26, thereby rotating 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 relative to other members, the first shaft 40 may be configured as a cylinder with 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 move in conjunction with the minute hand gear 42 without being fixed thereto.

[0024] The shaft 41 is a rod-shaped member that extends in a predetermined first direction. A hole 41a is formed at the tip of the shaft 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 41, i.e., the front side of the watch 10. The support member 46 is inserted into 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 to the hole 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 also 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 rotational movement of the driven magnet 32 ​​in the radial direction.

[0027] The support member 46 has, for example, a flange-shaped spacer 46a that protrudes in the outer circumferential direction at a predetermined location on the outer circumferential surface. The spacer 46a is a protrusion with a predetermined thickness, and by being interposed between the driven magnet 32 ​​and the drive magnet 43, it defines the axial gap between the driven magnet 32 ​​and the drive 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 drive magnet 43 serving as a second magnetic body is press-fitted and fixed to the support member 46 at a portion behind the spacer 46a, in other words, the portion between the tip end surface of the shaft 41 and the spacer 46a. Meanwhile, a driven magnet 32 ​​is rotatably attached to a portion on the front side of the spacer 46a, in other words, 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 drive 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 drive magnet 43 is configured, for example, in a circular ring shape with an axial hole 43a in the center, and is arranged coaxially with the driven magnet 32. The driven magnet 32 ​​is made of a ferromagnetic material such as samarium cobalt. The drive magnet 43 is arranged axially opposite the back side of the driven magnet 32 ​​with a spacer 46a sandwiched therebetween.

[0031] The drive magnet 43 is magnetized radially and has two different polarities in the circumferential direction. For example, one side of a radial polarization line L1 passing through the center is polarized as a south pole and the other side as a north pole. The drive 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 drive magnet 43 rotates together with the first shaft 40. The support member 46, which is part of the first shaft 40 of the gear train mechanism 23, is disposed in the shaft hole 43a of the drive magnet 43. The drive magnet 43 is fixed to the first shaft 40 by, for example, fitting or gluing. As a result, the drive magnet 43 is fixed to the minute hand gear 42.

[0032] The drive magnet 43 is disposed opposite the driven magnet 32, and holds the driven magnet 32 ​​in a rotational position where their south and north poles attract each other. Therefore, in a stationary state, the driven magnet 32 ​​and minute hand 21 are held in the rotational direction where the south and north 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 drive magnet 43 and driven magnet 32 ​​form a magnetic holding structure 30 as part of the train wheel mechanism 23.

[0033] The hour hand 22 includes a second hand member 47 having a predetermined width and length. For example, the second hand member 47 is shorter than the first hand member 31 and has a predetermined shape.

[0034] The second hand body 47 is configured, for example, 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 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 mounted on the dial 20 within 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 an hour wheel, and has a second shaft 45 extending along the rotation axis C1 as its center of rotation. 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 with 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 provided integrally with 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 serving 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 formed in a disk shape. The cover portion 24b is provided integrally with one end portion of the fixing pin 24a, which is the base end side in the insertion direction. For example, the cover portion 24b is formed 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 drive magnet 43 with the driven magnet 32 ​​interposed therebetween. The cover portion 24b is disposed on the front side of the driven magnet 32 ​​and restricts movement of the driven magnet 32 ​​toward the front side. In other words, 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 functioning as a restricting portion that restricts the position of the driven magnet 32.

[0042] The cover portion 24b is positioned such that its back surface (the other surface) faces 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 positioned opposite the front surface of the driven magnet 32 ​​with a small gap between them. Therefore, the cover portion 24b is positioned opposite at a position that does not interfere with the rotation of the driven magnet 32.

[0043] The magnetic shield 60 is positioned adjacent to the dial 20 on the opposite side of the first hand, minute hand 21, and the second hand, hour hand 22, and reduces the effect of magnetic flux from the drive magnet 43 and driven magnet 32 ​​on the timepiece module 13. The magnetic shield 60 is formed in a circular shape with the through-hole 20a of the dial 20 at its center. The magnetic shield is made of, for example, SPCC (cold-reduced carbon steel sheets and strips) or the like. The magnetic shield 60 may be made of any material that easily collects magnetic fields, and the material for the magnetic shield 60 is not limited to SPCC. For example, the magnetic shield 60 may be made of permalloy or the like.

[0044] Drive source 26 includes one or more drive mechanisms. Various drive mechanisms, such as a motor or a spring mechanism, can be used as the drive mechanism depending on the drive system of timepiece 10. A single drive mechanism may be used to drive multiple hands 21, 22 by transmitting power via gear train mechanism 23, or each hand 21, 22 may be provided with its own drive mechanism.

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

[0046] The switch 17 is pressed by an operator to switch modes of the clock module 13, correct the time, and so on.

[0047] In the timepiece 10 configured as described above, the minute hand 21 and a portion of the gear train mechanism 23 are connected by the holding force of the magnets 32 and 43. The driven magnet 32 ​​of the minute hand 21 is rotatably supported by the support member 46 of the first shaft 40. This prevents rotation of the minute hand 21 due to an external impact from being transmitted to the first shaft 40. For example, if the timepiece 10 is dropped or otherwise subjected to a lateral impact, a rotational moment will be generated in the minute hand 21, but the minute hand gear 42 will not be subjected to a rotational torque greater than the binding force created by the mutual magnetic forces between the drive magnet 43 and the driven magnet 32. Therefore, even if an impact is applied to the minute hand 21, the first shaft 40 is prevented from rotating, preventing damage to the interior of the movement due to rotation of the first shaft 40 caused by an external force. Furthermore, damage to the gears due to external forces and damage to the movement due to slippage or dislocation of the press-fitted parts of the hands can also be prevented. Furthermore, if a motor is used as the drive source 26, deviations in the time display due to step-out of the motor magnet can also be prevented.

[0048] Furthermore, by providing timepiece 10 with regulating member 24 having a regulating portion facing drive magnet 43 across driven magnet 32, it is possible to prevent magnet 32 ​​from becoming dislodged from shaft body 41 in the event of an impact. That is, for example, when the watch is stationary, the south and north poles of the magnets are arranged opposite each other, and drive magnet 43 and driven magnet 32 ​​are arranged opposite each other and attract each other, thereby holding driven magnet 32 ​​in place. However, if an impact causes the positional relationship between magnets 32 and 43 to shift so that the repulsive poles face each other, the repulsive force of the magnets may cause driven magnet 32 ​​to become dislodged from first shaft 40, applying a force in a direction that causes the hand body to float. Even in such a case, by arranging cover portion 24b of regulating member 24 opposite the front side of driven magnet 32, movement of magnet 32 ​​can be restricted, and the magnet can be maintained in a held state.

[0049] Therefore, with 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 will return the rotational positional relationship between the drive magnet 43 and the driven magnet 32 ​​to their original position, so that the minute hand 21 returns to the position it was in before the impact was applied, thereby achieving the effect of adjusting the time display. Furthermore, because the driven magnet 32 ​​and the drive magnet 43 are positioned 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 radial positional deviation can be restricted. Also, the spacer 46a interposed between the driven magnet 32 ​​and the drive magnet 43 creates a gap between the driven magnet 32 ​​and the drive magnet 43 in the axial direction. In other words, since friction caused by contact between the driven magnet 32 ​​and the drive magnet 43 can be reduced, a configuration can be achieved in which the frictional force generated by contact between the driven magnet 32 ​​and the drive magnet 43 does not interfere with the restoration of the minute hand 21.

[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 integrally including the fixing pin 24a and the cover portion 24b is exemplified, but the configuration of the restricting member 24 is not limited to the above example.

[0053] The restricting member 24 may also 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 hands, but this is not limitative, and other hands such as a second hand may also be provided.

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

[0056] [Second embodiment] The regulation member 24A according to the second embodiment will be explained below with reference to Figs. 7 to 9. Fig. 7 is an explanatory diagram showing the configuration of the hands and part of the train wheel 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 regulation member 24A has an annular cover portion 24c. As the rest of the configuration is the same as that of the timepiece 10 according to the first embodiment, explanation will be omitted.

[0057] As shown in FIG. 7 , the restricting 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 restricting portion. For example, the cover portion 24c is a washer member formed in the shape of a circular flat plate with a circular hole 24d in the center. The restricting 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. In other words, the restricting member 24A is connected and fixed to the first shaft 40 via the support member 46. The upper surface of the restricting member 24A is approximately at the same height as the upper surface of the support member 46. The cover portion 24c is disposed opposite the drive magnet 43 with the driven magnet 32 ​​sandwiched between them in the axial direction, and restricts the movement of the driven magnet 32 ​​toward the front side.

[0058] That is, for example, as shown in Fig. 8, in a stationary state, the S and N poles of the magnets are arranged opposite each other, and the drive magnet 43 and driven magnet 32 ​​are arranged opposite 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 drive 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 timepiece 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 when an impact is applied, and the magnet can be maintained in a held state.

[0060] Therefore, in the watch 10 according to 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 will return 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 will return to the position it was in before the impact was applied, thereby adjusting the time display.

[0061] [Third embodiment] A restricting member 24B according to the third embodiment will be described below with reference to Figures 10 and 11. The restricting member 24B shown in Figure 10 is a cap member integrally having a cover portion 24e arranged opposite 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 portion 24e has a circular hole 24g in its center and is configured as a circular flat plate. The tip of the support member 46 is inserted into the central hole 24g of the cover portion 24e, where it is fixed. The diameter of the central hole 24g of the cover portion 24e is larger than the diameter of the support member 46. Therefore, there is a slight gap between the cover portion 24e and the support member 46. The regulating member 24B simply rests on the driven magnet 32 ​​and is not fixed by press-fitting or other means. However, because the regulating member 24B is made of a magnetic material and is attracted to the driven magnet 32, it will not come off even if the display face of the timepiece 10 is reversed from top to bottom. In other words, the regulating member 24B is fixed to the first shaft 40 via the support member 46. The cover portion 24e has a circular outer shape that is larger than the outer shape of the driven magnet 32. Cover portion 24e is disposed opposite drive magnet 43 with driven magnet 32 ​​sandwiched between them in the axial direction, and restricts movement of driven magnet 32 ​​toward the front side. That is, because cover portion 24e is fixed to support member 46 at the tip end of first shaft 40, when driven magnet 32 ​​moves in the axial direction, cover portion 24e interferes with driven magnet 32, thereby functioning as a restricting portion that restricts the position of driven magnet 32 ​​and prevents it from coming loose.

[0063] The peripheral wall portion 24f is a wall-like member that extends from the outer peripheral edge of the circular cover portion 24e to the rear side, and is disposed opposite the outer peripheral portion 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 side of the support member 46 and the driven magnet 32, and is attached by covering the front surface, which is one side of the driven magnet 32, and the outer periphery of the front side.

[0065] The cover portion 24e of the restricting member 24B is configured so that the sum of the thickness T1 of the cover portion 24e and the thickness T2 of the driven magnet 32 ​​is greater than the distance D2 from the top surface of the cover portion 24e to the other rear surface of the opposing member, the watch crystal 15. 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 insertion depth dimension D1, 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 end until it comes off the first shaft 40 is shorter 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 when the driven magnet 32 ​​moves in the axial direction in a direction to come off as shown in Figure 11, it interferes with the opposing member before coming off the first shaft 40, thereby preventing it from coming off.

[0069] In this embodiment, too, cover portion 24e is disposed opposite drive magnet 32 ​​in the axial direction, sandwiching driven magnet 32 ​​therebetween, and restricting movement of driven magnet 32 ​​toward the front side prevents driven magnet 32 ​​from falling out. Furthermore, by making the dimension of the gap between cover portion 24e and the opposing member in the axial direction smaller than the depth dimension at which driven magnet 32 ​​engages with first shaft 40, falling out can be prevented. For example, even if cover portion 24e moves in the direction of falling out, magnet 32 ​​can be held so as not to come off the tip of first shaft 40. Therefore, even if an impact is applied and the relative positions of drive magnet 43 and driven magnet 32 ​​are shifted, the magnetic force restores the positional relationship between drive magnet 43 and driven magnet 32 ​​in the rotational direction, thereby returning minute hand 21 to the position it was in before the impact was 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 is equipped with a second hand 25 as a third pointer, and is equipped with 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 as a cylinder with 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 rest of the configuration is the same as in the first embodiment.

[0071] Second hand gear 49 is a gear member known as a second wheel and has third shaft 48, which extends along rotation axis C1, integrally formed at its rotation center. Second hand gear 49 is rotated by drive source 26, thereby rotating 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 arranged coaxially with the first shaft 40 and the second shaft 45. In this embodiment, the shaft body 41 of the first shaft 40 arranged 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 arranged in the hollow portion 41c.

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

[0075] Second hand 25 is positioned closer to the front than minute hand 21 and hour hand 22, and rotates together with second hand gear 49. In order to reduce the influence 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-fit when fixing second hand 25.

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

[0077] This embodiment also achieves the same effects as the first embodiment. Specifically, by providing the timepiece 100 with a support member 51 having a restricting portion 51b that faces the drive magnet 43 across the driven magnet 32, it is possible to prevent the magnet 32 ​​from slipping off the shaft 41 when an impact is applied. Therefore, the restricting portion 51b, which is positioned opposite the front side of the driven magnet 32 ​​as part of the support member that supports the second hand 25, restricts the movement of the magnet 32, maintaining its held state. Furthermore, since the minute hand 21 and the gear train mechanism 23 are connected by the holding force of the magnet, the transmission of external impacts can be suppressed. Furthermore, by using non-magnetic materials for the second hand 25, the shaft 50 of the third shaft 48, and the support member 51, the effects of magnetic force can be suppressed, allowing the hands to operate normally.

[0078] It is also possible to combine the features of the above-described multiple embodiments. For example, in the timepiece 10 according to the first embodiment, the axial dimension of the gap between the restricting member 24 and the opposing member, the watch crystal 15, can be made smaller than the depth dimension at which the restricting member 24 engages with the first shaft 40, i.e., the distance from the base end of the restricting member 24 to the position of the tip of the support member 46 on the tip side of the first shaft 40, thereby improving the retention effect.

[0079] In addition, 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 this. 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] Furthermore, in each of the above embodiments, an example was shown in which a holding structure using magnets 32, 43 was 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 magnets is interposed may also be applied as a support structure for the hour hand, second hand, and other pointers.

[0081] For example, although the example in which the drive magnet 43 and the driven magnet 32 ​​are made of a hard magnetic material has been shown, 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...Back cover 17...Switch 18a...Reinforcing member 18b...Cutting material 19...Gasket 20…Dial 20a...Through hole 21...Minute hand (first pointer) 22...Hour hand 23…wheel train mechanism 24, 24A, 24B...Regulating member 24a...Fixing pin 24b, 24c, 24e...Cover part (restriction 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 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...Magnetic-resistant plate 100...Clock C1...Rotation axis L1: Polarization line T1...Thickness dimension T2: Thickness dimension

Claims

1. The first guideline, A first magnet fixed to the first guideline, A second magnet is positioned opposite the first magnet, The first shaft is fixed to the second magnet, A gear train mechanism including a first rotating wheel that is linked to the first shaft, The system comprises a regulating member positioned opposite the second magnet via the first magnet, The axial dimension of the gap between the restricting member and the opposing member positioned opposite to the front side of the restricting member is smaller than the axial dimension from the back side of the first magnet to the tip of the first shaft. clock.

2. The regulating member is fixed to the first shaft. The clock according to claim 1.

3. The second magnet holds the first magnet by magnetic force, The first magnet and the second magnet are configured in a circular shape and are polarized in the circumferential direction of rotation. The clock according to claim 1.

4. The first magnet and the second magnet are arranged opposite each other in the axial direction. The clock according to claim 1 or 2.

5. The first magnet and the second magnet are configured in an annular shape with a hole in the center. The first shaft comprises a shaft body and a support member provided at the tip of the shaft body, The support member is disposed in the hole and rotatably supports the first magnet on the shaft, and restricts the radial movement of the rotation of the first magnet. The restricting member is fixed to the tip of the support member. The clock according to claim 1.

6. The support member has a spacer that protrudes in the outer peripheral direction, The spacer supports the first magnet so that it can rotate at a predetermined distance from the second magnet, and also restricts the radial position of the first magnet. The clock according to claim 5.

7. The regulating member comprises a cover portion positioned on the front side of the first magnet, and a pin connected to the cover portion and fixed to the tip of the support member. The clock according to claim 5.

8. The cover portion is positioned opposite the front side of the first magnet with a gap in between. The clock according to claim 7.

9. The cover portion is configured as a circular plate that is larger than the outer edge of the first magnet, and is positioned opposite to the second magnet via the first magnet. The clock according to claim 7.

10. The regulating member is made of a non-magnetic material. The clock according to claim 1.

11. Equipped with a second guideline, The gear train mechanism includes a second rotating wheel having a second axle to which the second pointer is fixed. The first and second axes are arranged coaxially. The clock according to claim 1.

12. Equipped with a third guideline, The gear train mechanism includes a third rotating wheel having a third axle to which the third pointer is fixed. The first axis, the second axis, and the third axis are arranged coaxially. The clock according to claim 11.

13. The first indicator is the minute hand, The second or third pointer is the hour hand or the second hand. At least one of the first guide, the first axis, the second guide, the second axis, the third guide, and the third axis is made of a non-magnetic material. The clock according to claim 12.

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