Watch

Abstract

A watch is provided with: a first pointer; a first magnet fixed to the first pointer; a second magnet disposed facing the first magnet; a first shaft fixed to the second magnet; the wheel train mechanism comprises a first rotating wheel linked with the first shaft; and a restricting member disposed facing the second magnet with the first magnet interposed therebetween.

Description

Technical Field

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

[0002] A watch such as a wristwatch contains a watch module having various parts inside a case. The watch module has a dial, pointers such as a minute hand and an hour hand, a gear train mechanism, a drive source, and the like.

[0003] In such a pointer support structure, for example, Japanese Patent Application Laid-Open No. 50-46162 discloses a mechanism using the magnetic force of a magnet, which includes a driving magnet fixed to the front end of the No. 4 wheel shaft and a driven magnet attached to the lower part of the second hand shaft. In a mechanism using the magnetic force of a magnet in a pointer support structure, when the watch is subjected to an impact such as being dropped, the support structure may be damaged or the pointer may be displaced due to the positional displacement of the magnet or the generation of a reaction force of the magnet. Summary of the invention

[0004] Problems to be solved by the invention

[0005] The present disclosure has been made in view of such a problem, and an object of the present invention is to provide a timepiece capable of preventing damage to a support structure or positional displacement of a pointer due to an impact.

[0006] Solutions to Solve Problems

[0007] A watch involved in one embodiment of the present invention comprises a first pointer, a first magnet fixed to the first pointer, a second magnet arranged opposite to the first magnet, a first axis fixed to the second magnet, a wheel train mechanism including a first rotating wheel linked to the first axis, and a limiting component arranged opposite to the second magnet across the first magnet.

[0008] Effects of the Invention

[0009] According to the present disclosure, it is possible to prevent damage to the support structure or positional deviation of the pointer due to impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a plan view showing the structure of the timepiece according to the first embodiment.

[0011] Figure 2 It is a cross-sectional view showing the structure of the watch.

[0012] Figure 3 This is a cross-sectional view showing the structure of the pointer and gear train mechanism of the watch.

[0013] Figure 4 This is an explanatory diagram showing the structure of a portion of the hands and the wheel train mechanism of the watch.

[0014] Figure 5 This is an explanatory diagram showing the structure of the magnet of the watch.

[0015] Figure 6 This is an explanatory diagram of the structure for holding the hands and part of the wheel train mechanism of the watch.

[0016] Figure 7 It is an explanatory diagram showing the structure of a part of the hands and the train wheel mechanism of a watch according to the second embodiment.

[0017] Figure 8 This is a diagram for explaining the structure of the table.

[0018] Fig. 9 This is a diagram for explaining the structure of the table.

[0019] Fig.10 It is an explanatory diagram showing the structure of a part of the hands and the train wheel mechanism of a watch according to the third embodiment.

[0020] Fig.11 It is an explanatory diagram of a structure for holding a part of a pointer and a train wheel mechanism of a watch according to a third embodiment.

[0021] Fig.12 It is an explanatory diagram showing the structure of a part of the hands and the train wheel mechanism of a watch according to the fourth embodiment. DETAILED DESCRIPTION

[0022] [First embodiment]

[0023] Below, refer to Figures 1 to 6 The structure of Table 10 according to the first embodiment of the present disclosure will be described. Figure 1 2 is a plan view showing the structure of a watch according to the first embodiment. Figure 2 A cross-sectional view showing the structure of a watch. Figure 3 This is a cross-sectional view showing the structure of the watch's hands and gear train mechanism.

[0024] Figure 4 This is an explanatory diagram showing the structure of a part of the gear train mechanism. Figure 5 This is an explanatory diagram showing the structure of the magnet of the watch. Figure 6 In each figure, the structure is schematically shown by appropriately enlarging, reducing, or omitting the structure.

[0025] like Figure 1 as well as Figure 2 As shown, the watch 10 is, for example, a wristwatch, which comprises: a shell 11 constituting an outer contour, a watch module 13 arranged in the shell 11, a watch glass 15 covering the front of the watch module 13, a back cover 16 covering the back of the watch module 13, and one or more switches 17 arranged on the periphery of the shell 11.

[0026] The housing 11 includes an annular first housing 11 a and a second housing 11 b disposed outside the first housing 11 a .

[0027] The first housing 11 a is formed in an annular shape and has a circular storage space therein for storing the watch module 13 and the like.

[0028] The dial 20 of the watch module 13 is disposed at the upper opening of the first housing 11a. A reinforcing member 18a and an edge member 18b are disposed at the outer peripheral portion of the dial 20 and at the inner edge of the first housing 11a. In addition, a groove is formed on the surface (the other surface) on the back side of the first housing 11a, and a waterproof ring 11d is installed in the groove to make it airtight with the back cover 16.

[0029] The second housing 11b is provided on the outer periphery of the first housing 11a. The second housing 11b is fixed to the first housing 11a by a fastening member such as a screw 11c.

[0030] The watch module 13 is accommodated in the storage space of the first housing 11a. The watch module 13 includes: a dial 20, a magnetic shielding plate 60, a minute hand 21 as a first pointer, an hour hand 22 as a second pointer, a gear train mechanism 23 as a power transmission part, a limiting member 24, and a driving source 26. In addition, the watch module 13 also includes various components required for the operation of the watch, such as a circuit substrate equipped with electronic components such as a battery, an IC, and an antenna, depending on the driving method.

[0031] The dial 20 is formed in a disk shape and is arranged in the upper part of the storage space of the first housing 11a. The dial 20 has a first shaft 40 constituting a part of the gear train mechanism 23 and a through hole 20a for inserting the second shaft 45 in the center portion. An edge member 18b provided with various time scales 14c is arranged on the outer peripheral portion of the surface of one side of the dial 20.

[0032] The minute hand 21 includes a first needle body 31 having a predetermined width and length. A driven magnet 32 ​​as a first magnetic body is fixed to the minute hand 21 .

[0033] The first needle body 31 is formed, for example, in the shape of an elongated plate. A first needle hole 31a as 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 arranged on the dial 20 in the storage space so as to be rotatable around the rotation axis C1.

[0034] The first needle body 31 is connected to the driving source 26 via the gear train mechanism 23 , and rotates so that its length direction points in a direction corresponding to the displayed time.

[0035] like Figure 4 as well as Figure 5 As shown, the driven magnet 32 ​​is, for example, formed in a ring shape having an axial hole 32a (hole portion) at the center. The driven magnet 32 ​​is, for example, formed of a strong magnetic body such as samarium cobalt. The driven magnet 32 ​​is magnetized in the radial direction and has two different poles in the circumferential direction. The driven magnet 32 ​​is, for example, polarized to an S pole on one side and to an N pole on the other side, with a radial polarization line L1 passing through the center as a boundary. The driven magnet 32 ​​has a support component 46 inserted into the axial hole 32a as a part of the gear train mechanism 23, and is rotatably supported by the support component 46.

[0036] The gear train mechanism 23 includes a plurality of gear components that are appropriately arranged according to the arrangement of the drive source 26 and the minute hand 21 and the hour hand 22. As an example, the gear train mechanism 23 includes at least a minute hand gear 42 as a first rotating wheel having a first shaft 40 engaged with the minute hand 21 and an hour hand gear 44 as a second rotating wheel having a second shaft 45 engaged with the hour hand 22. The gear train mechanism 23 and the drive source 26 together constitute a movement for moving the hands 21 and 22.

[0037] The minute hand gear 42 is a gear member called 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 driving source 26 , thereby rotating the minute hand 21 .

[0038] The first shaft 40 includes a shaft body 41 and a support member 46 disposed at the front end of the shaft body 41. The first shaft 40 is fixed to the rotation center of the minute hand gear 42. In addition, according to the configuration relationship with other components, the first shaft 40 can also be configured as a cylinder having a through hole in the center for inserting other shaft components. In addition, the first shaft 40 can be provided integrally with the minute hand gear 42, or can also be composed of other components. In addition, the first shaft 40 can be fixed to the minute hand gear 42, or can be a structure that is not fixed to the minute hand gear 42 but linked.

[0039] The shaft body 41 is a rod-shaped member extending in a predetermined first direction. A hole portion 41a is formed at the front end portion of the shaft body 41, into which the support member 46 is inserted and fixed. The hole portion 41a is, for example, a bottomed recessed portion that opens toward the front end side of the shaft body 41, that is, the front side of the watch 10. The support member 46 is inserted and fixed into the hole portion 41a.

[0040] The support member 46 is a shaft member having a smaller diameter than the shaft body 41. The support member 46 is inserted and fixed to the hole portion 41a of the shaft body 41, and is coaxially supported with the shaft body 41.

[0041] The support member 46 is fixed to the shaft body 41 and fixes the driven magnet 32. The support member 46 is arranged in the shaft hole 32a of the driven magnet 32 ​​and the shaft hole 43a of the driving magnet 43. The support member 46 rotatably supports the driven magnet 32 ​​and restricts the radial movement of the driven magnet 32 ​​due to rotation.

[0042] The support member 46 has, for example, a flange-shaped spacer 46a protruding in the outer peripheral direction at a predetermined position on the outer peripheral surface. The spacer 46a is a protrusion having a predetermined thickness, and defines the gap between the driven magnet 32 ​​and the driving magnet 43 in the axial direction by being interposed 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.

[0043] The driving magnet 43 as the second magnet is press-fitted and fixed to the back side of the spacer 46a of the support member 46, in other words, to the area between the front end surface of the shaft body 41 and the spacer 46a. On the other hand, the driven magnet 32 ​​is rotatably mounted to the front side of the spacer 46a, in other words, to the area closer to the front end side 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 restricts the radial position of the driven magnet 32.

[0044] An insertion hole 46b for inserting the fixing pin 24a of the limiting member 24 is formed at the front end of the support member 46. The fixing pin 24a of the limiting member 24 is inserted and fixed in the insertion hole 46b. In addition, the axial dimension of the support member 46 is configured such that the front end surface of the front end of the support member 46 protrudes slightly toward the front side than the front end surface of the front end of the driven magnet 32.

[0045] like Figure 4 As shown, the driving magnet 43 is, for example, an annular shape having an axial hole 43a at the center, and is coaxially arranged with the driven magnet 32. The driving magnet 43 is, for example, made of a strong magnetic material such as samarium cobalt. The driving magnet 43 is arranged opposite to the back surface of the driven magnet 32 ​​via a spacer 46a in the axial direction.

[0046] The driving magnet 43 is magnetized in the radial direction and has two different poles in the circumferential direction. The driving magnet 43 is, for example, bounded by a radial polarization line L1 passing through the center, with one side polarized to the S pole and the other side polarized to the N pole. The driving magnet 43 is pressed and fixed to the shaft body 41 by a spacer 46a of a support component 46 that is pressed into the shaft body 41 fixed to the first shaft 40. In addition, the driving magnet 43 rotates together with the first shaft 40. In the shaft hole 43a of the driving magnet 43, a support component 46 that is a part of the first shaft 40 of the wheel train mechanism 23 is arranged. 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.

[0047] The driving magnet 43 is arranged opposite to the driven magnet 32, and the driven magnet 32 ​​is held in a rotational position where the S poles and N poles of both sides attract each other. Therefore, in a stationary state, the driven magnet 32 ​​and the minute hand 21 are held in the rotational direction where the S poles and N poles of the magnet attract each other, and when the watch is in normal operation, the minute hand 21 rotates synchronously with the rotation of the minute hand gear 42. That is, by the driving magnet 43 and the driven magnet 32, a magnetic holding structure 30 is formed in a part of the wheel train mechanism 23.

[0048] The hour hand 22 includes a second needle body 47 having a predetermined width and length. For example, the second needle body 47 is configured in a predetermined shape shorter than the first needle body 31 .

[0049] The second needle body 47 is formed in the shape of an elongated plate, for example, and has a second needle hole 47a at the base end portion of the rotation. A second shaft as a part of the gear train mechanism 23 is fixed to the second needle hole 47a of the second needle body 47. The second needle body 47 is rotatably arranged on the dial 20 in the storage space. The second needle body 47 is connected to the drive source 26 via the gear train mechanism 23, and performs a rotational motion in a manner that the length direction points to the direction corresponding to the time.

[0050] The hour hand gear 44 is a gear member called a barrel wheel, and integrally includes a second shaft 45 extending along the rotation axis C1 at its rotation center. The hour hand gear 44 is rotated by the driving source 26 , thereby rotating the hour hand 22 .

[0051] The second shaft 45 is a hollow rod-shaped member extending in a predetermined first direction. The second shaft 45 is configured to be cylindrical and has a through hole 45a at the center portion that can be inserted into the first shaft 40. The second shaft 45 is rotatably mounted on the outer periphery of the first shaft 40. The second shaft 45 is integrally provided or fixed to the axial center portion of the hour hand gear 44.

[0052] The second needle body 47 is press-fitted and fixed to the front end portion of the second shaft 45. That is, the second needle body 47 rotates as the second shaft 45 rotates.

[0053] For example, the minute hand 21 , the first shaft 40 , the hour hand 22 , and the second shaft 45 are made of non-magnetic materials.

[0054] like Figure 3 As shown in FIG. 1 , the restricting member 24 is a retaining member integrally including 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 formed of, for example, a non-magnetic material such as brass.

[0055] The fixing pin 24a is a cylindrical shaft having an outer diameter slightly larger than the insertion hole 46b formed in the support member 46 at the front end of the first shaft 40, and is press-fitted and fixed to the insertion hole 46b of the support member 46. That is, the restriction member 24 is connected to the first shaft 40 via the support member 46.

[0056] The cover portion 24b is configured in a circular plate shape. The cover portion 24b is integrally provided at one end portion on the base end side of the insertion direction of the fixed 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 arranged opposite to the driving magnet 43 across the driven magnet 32. The cover portion 24b is arranged on the front side of the driven magnet 32 ​​and limits the movement of the driven magnet 32 ​​toward the front side. That is, the cover portion 24b is fixed to the support member 46 at the front end portion of the first shaft 40 via the fixed pin 24a, so that when the driven magnet 32 ​​moves in the axial direction, the cover portion 24b interferes with the driven magnet 32, thereby becoming a limiting portion that limits the position of the driven magnet 32.

[0057] The back side (other side) of the cover 24b is arranged and positioned to be opposite to the front end face of the support member 46. That is, the axial dimension of the support member 46 is configured such that the front end face of the front end of the support member 46 slightly protrudes forward than the front end face of the front end of the driven magnet 32, so the cover 24b is arranged relative to the front surface of the driven magnet 32 ​​with a small gap therebetween. Therefore, the cover 24b is arranged relative to the position that does not hinder the rotation of the driven magnet 32.

[0058] The anti-magnetic plate 60 is arranged adjacent to the minute hand 21 as the first pointer and the hour hand 22 as the second pointer relative to the dial 20, and reduces the influence of the magnetic flux from the driving magnet 43 and the driven magnet 32 ​​on the watch module 13. The anti-magnetic plate 60 is configured as a circular plate centered on the through hole 20a of the dial 20. The anti-magnetic plate is formed, for example, of SPCC (Cold-reduced carbon steel sheets and strips). In addition, the anti-magnetic plate 60 can be made of any material that can easily collect magnetic fields, and the material forming the anti-magnetic plate 60 is not limited to SPCC. For example, the anti-magnetic plate 60 can be formed of Permalloy or the like.

[0059] The driving source 26 has one or more driving mechanisms. As the driving mechanism, various driving mechanisms such as a motor and a clockwork mechanism can be used according to the driving method of the watch 10. It can be a structure in which power is transmitted through the gear train mechanism 23, so that a plurality of needles 21 and 22 are driven by one driving mechanism, or it can be a structure in which each needle 21 and 22 has a driving mechanism.

[0060] The watch glass 15 is a so-called windshield, which is made of a light-transmitting material and is in the shape of a transparent disk. The watch glass 15 is supported on the edge member 18b at the inner edge of the upper opening of the first housing 11a, and covers the front side of the dial 20. The watch glass 15 is mounted on the inner edge of the first housing 11a via a gasket 19, for example.

[0061] The switch 17 is pressed by an operator to switch the mode of the watch module 13 , adjust the time, and the like.

[0062] In the watch 10 constructed as described above, the minute hand 21 and a part of the wheel train mechanism 23 are connected by the holding force of the magnets 32 and 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. As a result, the rotation of the minute hand 21 caused by an external impact can be suppressed from being transmitted to the first shaft 40. For example, when the watch 10 is impacted from the side direction due to falling, a torque in the rotation direction is generated on the minute hand 21, but the minute hand gear 42 is not subjected to a rotation torque greater than the restraining force generated by the magnetic force between the driving magnet 43 and the driven magnet 32. Therefore, when the minute hand 21 is impacted, even if the minute hand 21 rotates due to the impact, the first shaft 40 can be prevented from rotating, so that the rotation of the first shaft 40 caused by the external force can be prevented from damaging the inside of the movement. In addition, it is also possible to prevent the gear from being damaged by an external force, and the movement from being damaged by slipping or falling of the pressed fixed part of the needle. Furthermore, for example, when a motor is provided as the driving source 26 , it is also possible to prevent the time display from being shifted due to misalignment of the magnet of the motor.

[0063] In addition, in Table 10, by providing a limiting member 24 having a limiting portion that is opposite to the driving magnet 43 across the driven magnet 32, it is possible to prevent the magnet 32 ​​from falling off from the shaft body 41 when it is impacted. That is, for example, in a stationary state, the S pole and the N pole of the magnet are arranged opposite to each other, and the driving magnet 43 and the driven magnet 32 ​​are arranged opposite to each other and attracted to each other, thereby holding the driven magnet 32, but the positional relationship between the magnets 32 and 43 may be offset by an impact, and when the repelling poles are in an opposing positional relationship, the driven magnet 32 ​​may fall off from the first shaft 40 due to the reaction force of the magnet, and the needle body may be forced in the floating direction. Even in such a case, by arranging the cover 24b of the limiting member 24 opposite to the front side of the driven magnet 32, the movement of the magnet 32 ​​can be restricted, and the holding state of the magnet can be maintained.

[0064] Therefore, according to the watch 10 involved in the above-mentioned embodiment, even if the relative position of the driving magnet 43 and the driven magnet 32 ​​is offset due to an impact, the positional relationship of the driving magnet 43 and the driven magnet 32 ​​in the rotation direction will return to the original position due to the magnetic force, so that the minute hand 21 can be restored to the position before the impact and the time display can be adjusted. In addition, by arranging the driven magnet 32 ​​and the driving magnet 43 relative to each other in the axial direction, the rotational movement of each other will not be hindered.

[0065] Furthermore, the driven magnet 32 ​​is rotatably supported in a space-saving manner by the support member 46 provided on the first shaft 40, and the radial positional deviation can be restricted. In addition, a gap is generated between the driven magnet 32 ​​and the driving magnet 43 in the axial direction by the spacer 46a interposed between the driven magnet 32 ​​and the driving magnet 43. That is, the friction caused by the contact between the driven magnet 32 ​​and the driving magnet 43 can be reduced, so that the restoration of the minute hand 21 is not hindered by the friction force generated by the contact between the driven magnet 32 ​​and the driving magnet 43.

[0066] In addition, the above-mentioned embodiment is an example and does not limit the scope of the invention.

[0067] For example, in the above embodiment, the restricting member 24 integrally including the fixing pin 24 a and the cover portion 24 b is exemplified, but the structure of the restricting member 24 is not limited to the above example.

[0068] Furthermore, the restriction member 24 may be configured to prevent the magnet from falling off by narrowing the distance between the magnet to be restricted and the opposing member.

[0069] In the above embodiment, an example is shown in which the minute hand 21 and the hour hand 22 are provided as hands, but the present invention is not limited thereto, and other hands such as a second hand may be provided.

[0070] In addition, the above embodiment shows an example in which the holding structure 30 composed of magnets 32 and 43 is sandwiched in the supporting structure of the minute hand 21, but it is not limited to this. As a supporting structure for the hour hand, second hand, or other hands, a structure in which a holding structure composed of magnets is sandwiched can also be applied.

[0071] [Second Embodiment]

[0072] Below, refer to Figures 7 to 9 A restriction member 24A according to the second embodiment will be described. Figure 7 It is an explanatory diagram showing the structure of a part of the hands and the train wheel mechanism of a watch according to the second embodiment. Figure 8 as well as Fig. 9 3 is an explanatory diagram of the holding structure 30. In this embodiment, the limiting member 24A includes a circular ring-shaped cover portion 24c. As other structures are configured in the same manner as the watch 10 according to the first embodiment, description thereof will be omitted.

[0073] like Figure 7 As shown, the limiting component 24A has a washer-shaped cover portion 24c fixed to the outer periphery of the support component 46 at the front end of the first shaft 40 as a limiting portion. For example, the cover portion 24c is a washer component that is constructed in a circular flat plate shape and has a circular hole 24d in the center. The limiting component 24A is made of non-magnetic material. The cover portion 24c is connected and fixed to the front end of the support component 46 by pressing the front end of the support component 46 into the central hole 24d. That is, the limiting component 24A is connected to the first shaft 40 via the support component 46 and is fixed thereto. The upper surface of the limiting component 24A is almost at the same height as the upper surface of the support component 46. The cover portion 24c is arranged opposite to the driving magnet 43 in the axial direction with the driven magnet 32 ​​therebetween, and limits the movement of the driven magnet 32 ​​toward the front side.

[0074] That is, for example Figure 8 As shown, in the static state, the S pole and the N pole of the magnet are arranged opposite to each other, and the driving magnet 43 is arranged opposite to the driven magnet 32 ​​and attracts each other, thereby holding the driven magnet 32. Fig. 9 As shown, when the positional relationship between the driven magnet 32 ​​and the driving magnet 43 is shifted by impact and the repelling poles are in an opposing positional relationship, the driven magnet 32 ​​may fall off the first shaft 40 due to the reaction force of the magnets and the needle body may be forced in the floating direction.

[0075] In the watch 10 involved in this embodiment, by providing a limiting component 24A having a disengagement prevention portion opposite to the driving magnet 43 across the driven magnet 32, it is possible to prevent the magnet 32 ​​from falling off the first shaft 40 when impacted and maintain the magnet's retention state.

[0076] Therefore, according to the watch 10 involved in the above-mentioned embodiment, even if the relative position of the driving magnet 43 and the driven magnet 32 ​​is shifted due to an impact, the positional relationship between the driving magnet 43 and the driven magnet 32 ​​in the rotation direction will return to the original position due to the magnetic force, so that the minute hand 21 can be restored to the position before the impact and the time display can be adjusted.

[0077] [Third Embodiment]

[0078] Below, refer to Fig.10 as well as Fig.11 A restriction member 24B according to the third embodiment will be described. Fig.10 The restricting member 24B shown is a cap member integrally including a cover portion 24 e disposed on the front side facing the driven magnet 32 ​​and a peripheral wall portion 24 f formed on the outer edge of the cover portion 24 e.

[0079] The cover 24e is formed with a circular hole 24g in the center and is configured as a circular flat plate. The front end of the support member 46 is inserted into the hole 24g in the center of the cover 24e and is fixed thereto. The diameter of the hole 24g in the center of the cover 24e is larger than the diameter of the support member 46. As a result, a slight gap is left between the cover 24e and the support member 46. The limiting member 24B is simply placed on the driven magnet 32 ​​and is not fixed by pressing in or the like. However, the limiting member 24B is made of a magnetic material and is pulled by the driven magnet 32, so even if the display surface of a watch 10 is reversed from the upper side to the lower side, the limiting member 24B will not fall off. That is, the limiting member 24B is fixed to the first shaft 40 via the support member 46. The cover 24e has a circular outer shape that is larger than the outer shape of the driven magnet 32. The cover 24e is arranged opposite to the driving magnet 43 in the axial direction across the driven magnet 32, and restricts the movement of the driven magnet 32 ​​toward the front side. That is, the cover 24e is fixed to the support member 46 at the front end of the first shaft 40, so when the driven magnet 32 ​​moves in the axial direction, the cover 24e interferes with the driven magnet 32, thereby becoming a restricting portion that restricts the position of the driven magnet 32 ​​to prevent it from falling off.

[0080] The peripheral wall portion 24 f is a wall-shaped member extending from the outer edge of the circular cover portion 24 e toward the rear surface, and is disposed to face the outer peripheral portion of the front side of the driven magnet 32 ​​.

[0081] The restricting member 24B is fixed to the supporting member 46 by press-fitting from the front side of the supporting member 46 and the driven magnet 32 ​​, and is attached to cover the surface of one surface side and the outer peripheral portion of the front side of the driven magnet 32 ​​.

[0082] The cover 24e of the limiting member 24B is configured such that the sum of the thickness dimension T1 of the cover 24e and the thickness dimension T2 of the driven magnet 32 ​​is greater than the distance D2 from the top surface of the cover 24e to the other side, i.e., the back side, of the watch glass 15 as an opposing member. That is, the moving range of the driven magnet 32 ​​when moving in the falling direction is set to a dimension smaller than the depth dimension of the engagement between the driven magnet 32 ​​and the first shaft 40.

[0083] That is, the axial dimension D2 of the gap between the front end of the limiting component 24B and the watch glass 15 as an opposing component relatively arranged on the front side of the limiting component 24B is smaller than the depth dimension D1 from the base end of the driven magnet 32 ​​to the front end of the supporting component 46 of the first shaft 40.

[0084] In other words, when the driven magnet 32 ​​is fixed to the first shaft 40, the distance from the front end of the support member 46, which is the front end of the first shaft 40, to the base end of the driven magnet 32, i.e., the dimension D1 of the insertion depth, is configured to be larger than the dimension D2 of the gap between the limiting member 24 and the watch glass 15. Therefore, the distance until the cover 24e abuts against the opposing member, i.e., the watch glass 15, is dimensioned to be smaller than the distance that the cover 24e moves in the axial front end side until it falls off from the first shaft 40.

[0085] Therefore, when the limiting member 24B is arranged in the normal position, the insertion depth dimension D1 of the first shaft 40 is greater than the distance D2 to the watch glass 15 as the opposing member. Fig.11 As shown, when the driven magnet 32 ​​moves in a direction deviating from the axial direction, before the driven magnet 32 ​​falls off from the first shaft 40 , the restriction member 24B interferes with the opposing member, thereby preventing the driven magnet 32 ​​from falling off.

[0086] In the present embodiment, the cover 24e is arranged opposite to the driving magnet with the driven magnet 32 ​​interposed therebetween in the axial direction, and the driven magnet 32 ​​can be prevented from falling off by limiting the movement of the driven magnet 32 ​​toward the front side. In addition, the driven magnet 32 ​​can be prevented from falling off by making the size of the gap with the opposing component in the axial direction smaller than the depth size of the engagement between the driven magnet 32 ​​and the first shaft 40. For example, even if the cover 24e may move in the falling-off direction, the magnet 32 ​​can be held and not fall off from the front end of the first shaft 40. Therefore, even if the relative position of the driving magnet 43 and the driven magnet 32 ​​is offset due to an impact, the positional relationship between the driving magnet 43 and the driven magnet 32 ​​in the rotation direction will return to the original position due to the magnetic force, so that the minute hand 21 can be restored to the position before the impact and the effect of adjusting the display at all times can be obtained.

[0087] [Fourth Embodiment]

[0088] Next, refer to Fig.12 The watch 100 according to the fourth embodiment will be described. The watch 100 according to the present embodiment includes a second hand 25 as a third pointer, and includes a second hand gear 49 as a third rotating wheel having a third shaft 48 and driving the second hand 25 as a part of the wheel train mechanism 23. In addition, in the present embodiment, the support member 46 is configured as a cylindrical shape having a hollow portion. In the present embodiment, the support member 51 as a part of the third shaft 48 supporting the second hand 25 becomes a limiting member. The other structures are the same as those of the first embodiment.

[0089] The second hand gear 49 is a gear member called a second wheel, and has a third shaft 48 extending along the rotation axis C1 integrally formed at its rotation center. The second hand gear 49 is rotated by the driving source 26 , thereby rotating the second hand 25 .

[0090] The third shaft 48 includes a rod-shaped shaft body 50 and a support member 51 as a restriction member provided at the front end of the shaft body 50 .

[0091] 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 formed in a cylindrical shape having a hollow portion 41c, and the rod-shaped shaft body 50 is disposed in the hollow portion 41c.

[0092] The support member 51 includes a cylindrical fixing portion 51a that is pressed and fixed to the second hand 25, and a limiting portion 51b that is arranged opposite to the front side of the driven magnet 32. The support member 51 is fixed to the second hand 25. The limiting portion 51b is configured as a flange in which a part of the outer peripheral surface of the cylindrical fixing portion 51a extends radially outward. The limiting portion 51b is arranged between the second hand 25 and the driven magnet 32 ​​in the axial direction. The limiting portion 51b is arranged opposite to the front side of the driven magnet 32, and when the driven magnet 32 ​​moves on the front side, it interferes with the driven magnet 32, thereby constituting an anti-dropping component that limits the position of the driven magnet 32.

[0093] The second hand 25 is arranged in front of the minute hand 21 and the hour hand 22, and rotates together with the second hand gear 49. The second hand 25, the shaft 50 of the third shaft 48, and the support member 51 are made of non-magnetic materials having a hardness that can withstand the pressure when the second hand 25 is fixed to suppress the influence of magnetism.

[0094] In this embodiment, the support member 46 of the first shaft 40 is formed 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, and the spacer 46a rotatably holds the driven magnet 32. The other structures are formed in the same manner as the first embodiment described above.

[0095] In this embodiment, the same effect as the first embodiment described above can be achieved. That is, in the watch 100, by having a support member 51 having a limiting portion 51b opposite to the driving magnet 43 across the driven magnet 32, it is possible to prevent the magnet 32 ​​from falling off the shaft body 41 when subjected to an impact. Therefore, as a part of the support member supporting the second hand 25, the movement of the magnet 32 ​​can be limited by the limiting portion 51b arranged relative to the front side of the driven magnet 32, and the holding state can be maintained. In addition, the minute hand 21 is connected to the wheel train mechanism 23 by the holding force of the magnet, so that the transmission of the impact from the outside 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 the magnetic force can be suppressed, and the pointer can work normally.

[0096] In addition, the features of the above-mentioned multiple embodiments may be combined. For example, in the watch 10 involved in the first embodiment, the anti-falling effect can be improved by configuring the axial dimension of the gap between the limiting member 24 and the watch glass 15 as an opposing member to be smaller than the depth dimension of the engagement between the limiting member 24 and the first shaft 40, that is, the distance from the end of the base end side of the limiting member 24 to the position of the front end of the support member 46 on the front end side of the first shaft 40.

[0097] In addition, in the above-mentioned embodiment, the second hand 25 and the third shaft 48 as the third pointer are made of non-magnetic materials, but the present invention is not limited thereto. In addition, other components may be made of non-magnetic materials instead of or in addition to the second hand 25 and the third shaft 48. 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 components may be made of non-magnetic materials.

[0098] In addition, in the above-mentioned embodiments, an example is shown in which a retaining structure composed of magnets 32 and 43 is sandwiched in the supporting structure of the minute hand 21, but it is not limited to this. As a supporting structure for the hour hand, second hand, or other hands, a structure in which a retaining structure composed of magnets is sandwiched can also be applied.

[0099] For example, the example in which the driving magnet 43 and the driven magnet 32 ​​are made of hard magnetic material is shown, but the present invention is not limited to this. For example, one of them may be made of soft magnetic material.

[0100] Although several embodiments of the present disclosure have been described, the present disclosure is intended to encompass the inventions described in the claims and their equivalents.

Claims

1. A table, characterized in that: have: First pointer; a first magnet fixed to the first pointer; a second magnet, disposed opposite to the first magnet; a first shaft fixed to the second magnet; a gear train mechanism comprising a first rotating wheel linked to the first shaft; and The limiting member is arranged to face the second magnet via the first magnet.

2. The watch according to claim 1, characterized in that The restriction member is fixed to the first shaft.

3. The watch according to claim 1 or 2, characterized in that The second magnet holds the first magnet by magnetic force, The first magnet and the second magnet are magnets which are configured in a circular shape and are polarized in the circumferential direction of rotation.

4. A watch according to any one of claims 1 to 3, characterized in that The first magnet and the second magnet are arranged opposite to each other in the axial direction.

5. The watch according to any one of claims 1 to 4, characterized in that The first magnet and the second magnet are configured in a ring shape having a hole at the center. The first shaft includes a shaft body and a support member provided at a front end portion of the shaft body. The support member is arranged in the hole portion, rotatably supports the first magnet on the shaft body, and restricts the radial movement of the first magnet during rotation. The restriction member is fixed to a front end portion of the support member.

6. The watch according to claim 5, characterized in that The restriction member includes a cover portion disposed on the front surface side of the first magnet and a pin connected to the back surface side of the cover portion and fixed to the front end portion of the support member.

7. A watch according to any one of claims 1 to 5, characterized in that The limiting member includes a limiting portion fixed to the first shaft and arranged on the surface side of the first magnet. An axial dimension of a gap between the restriction member and an opposing member disposed on a surface side of the restriction member is smaller than an axial dimension from a base end portion of the first magnet to a front end portion of the first shaft.

8. A watch according to any one of claims 1 to 7, characterized in that With a second pointer, The gear train mechanism comprises a second rotating wheel having a second shaft, and the second shaft fixes the second pointer. The first shaft and the second shaft are coaxially arranged.

9. The watch according to claim 8, characterized in that With a third pointer, The gear train mechanism comprises a third rotating wheel having a third shaft, and the third shaft fixes the third pointer. The first axis, the second axis, and the third axis are coaxially arranged.

10. The watch according to claim 9, characterized in that The first pointer is the minute hand. The second pointer or the third pointer is an hour hand or a second hand, At least one of the first pointer, the first shaft, the second pointer, the second shaft, the third pointer, and the third shaft is made of a non-magnetic material.

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