Stud, balance spring with stud, method for manufacturing balance spring with stud, balance spring mechanism, and timepiece

Abstract

The invention provides a stud, a stud-equipped hairspring, a method for manufacturing the stud-equipped hairspring, a balance spring mechanism, and a timepiece, which are excellent in manufacturing efficiency and capable of preventing an adhesive from falling off. The outer pile comprises: a cylindrical support part; the pile clamp part is arranged on the supporting part and provided with a gap part for placing and fixing a hairspring, the pile clamp part is in a cone frustum shape with the center line passing through the center of the cylinder as the center, and a groove for forming a necking is formed in the periphery between the supporting part and the pile clamp part. The slit part is a notch part formed from the upper surface of the cone-frustum-shaped pile clamp part to the bottom surface, and enters a part of the groove.

Description

Technical Field

[0001] The invention relates to an outer pile, a hairspring with the outer pile and a manufacturing method thereof, a balance wheel hairspring mechanism and a watch with the balance wheel hairspring mechanism. Background Art

[0002] A hairspring is used in the speed regulator of a mechanical watch. Since the hairspring composed of a spiral spring is used to maintain the accuracy of the movement of the hands, sometimes the hairspring is directly contacted with the hairspring after the end of the hairspring is bonded and fixed to the stud. At this time, if the fixing strength is insufficient, the hairspring may fall off the stud. Therefore, a technology for firmly bonding the end of the hairspring to the stud has been proposed.

[0003] For example, in Patent Document 1, a through hole is formed in the side wall of a slit portion at the end of a stud where a hairspring is provided, and an adhesive is filled in the slit portion so that the adhesive is also filled in the through hole (for example, Figure 1 C). Thus, when the adhesive is cured, the adhesive in the through hole becomes a locking portion, preventing the adhesive from falling out of the slit portion. In addition, a cutout portion (for example, Figure 2 D).

[0004] Patent Document 1: Japanese Patent Application Publication No. 2019-200199

[0005] However, the stud of Patent Document 1 has a complex structure and many processing steps. Specifically, the stud in a cylindrical shape is based on processing in the circumferential direction, but processing of the linear slit portion becomes another processing, and opening of the slit portion to the side wall becomes another processing, so the processing steps are many and the manufacturing efficiency is poor.

[0006] That is, a stud which is excellent in manufacturing efficiency and can prevent the adhesive from falling off is sought. Summary of the invention

[0007] The stud of one embodiment of the present application includes: a support portion, which is cylindrical; and a pile clamp portion, which is provided on the support portion and has a slit portion for receiving and fixing a hairspring, the pile clamp portion is in the shape of a truncated cone centered on a center line passing through the center of the cylinder, a groove forming a neck is provided on the outer periphery between the support portion and the pile clamp portion, and the slit portion is a cutout portion formed from the upper surface of the pile clamp portion of the truncated cone toward the bottom surface, and enters a part of the groove.

[0008] A hairspring with a stud according to one embodiment of the present application is a hairspring with a stud in which an end of the hairspring is joined to an outer stud by an adhesive, wherein the outer stud is provided with a slit portion for receiving and fixing the end of the hairspring and a groove formed on the outer circumference, the slit portion enters a part of the groove, and the adhesive is present at a position including the slit portion and the groove.

[0009] A method for manufacturing a hairspring with an external stud according to one embodiment of the present application includes: a step of preparing an external stud having a slit portion for placing and fixing an end portion of the hairspring and a groove formed on the outer circumference; a step of filling an adhesive into the interior of the slit portion with the end portion of the hairspring placed in the slit portion; and a step of curing the adhesive, wherein the adhesive is filled in the adhesive filling step so that the adhesive also enters the groove, and in the curing step, the adhesive is cured while being present in the groove.

[0010] A balance wheel and hairspring mechanism according to one embodiment of the present application comprises: the hairspring with a stud as described above; a balance shaft rotatably supported by a support member; a balance wheel fixed to the balance shaft; and a stud fixed to the balance shaft.

[0011] A timepiece according to one aspect of the present application includes: the above-mentioned balance with hairspring; and a movement including the balance with hairspring.

[0012] A stud according to one embodiment of the present application has a slit portion for receiving and fixing a hairspring, and has a groove forming a constriction on the outer periphery at a position overlapping with a bottom surface of the slit portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the timepiece according to Embodiment 1.

[0014] Figure 2 This is a perspective top view of the movement.

[0015] Figure 3 It is a cross-sectional view of the speed regulator.

[0016] Figure 4 It is a three-dimensional picture of the hairspring.

[0017] Figure 5 It is a three-dimensional image of a hairspring with an external stud.

[0018] Figure 6 It is a three-dimensional diagram of the outer pile.

[0019] Figure 7 It is a side view of the outer pile.

[0020] Figure 8 yes Figure 7 An enlarged view of part b.

[0021] Fig. 9 It is a top view of the outer stud.

[0022] Fig.10 It is a flowchart showing the process of the manufacturing method of the hairspring with an outer stud.

[0023] Fig.11 It is a side view of the outer stud of Embodiment 2.

[0024] Fig.12 It is a perspective view of the outer stud in a different mode.

[0025] Fig.13 It is a perspective view of the hairspring with an outer stud of Embodiment 3.

[0026] Reference Numeral Explanation

[0027] 2: Outer case; 3: Dial; 3A: Date window; 4A: Hour hand; 4B: Minute hand; 4C: Second hand; 5: Power reserve indicator; 6: Date wheel; 7: Crown; 8: Hairspring; 10: Movement; 11: Main plate; 12: First bridge; 13: Balance spring bridge; 13b: Reference plane; 15: Outer stud (bearded); 16: Base portion; 17: Support portion; 18: Stud clamp portion (beard receiving portion); 19a: Side wall; 19b: Side wall; 21: First wheel; 23: Third wheel; 24: Fourth wheel; 25: Gap portion; 26a: Side; 26b: Side; 27: Bottom surface; 28: Hole; 29: Escapement wheel; 30: Manual winding mechanism; 31: Arbor; 32: Clutch wheel; 33: Cylindrical wheel; 35: Groove; 35a: First surface; 35b: Second surface; 35c: Third surface; 36: Upper surface; 38a: Groove; 38b: Groove; 39: Groove; 40: Pinion; 41: First pinion; 42: Second pinion; 44: Adhesive; 45: Outer stud; 46: Outer stud; 48: Bonding member; 49: Cutout portion; 51: First intermediate wheel; 52: Second intermediate wheel; 53: Escapement fork; 55: Regulator; 56: Inner stud (bearded ball); 60: Great wheel; 62: Center line; 81: Inner end; 82: Outer end; 85: Hairspring with outer stud; 100: Pointer; 400: Balance spring mechanism; 410: Balance staff; 420: Balance wheel; 430: Breguet balance; 460: Index regulator; 461: Adjusting bar (beard bar); 462: Stop portion (stopping portion). Detailed Embodiments

[0028] Embodiment 1

[0029] ***Outline of the Clock***

[0030] Figure 1 It is a top view of the clock of this embodiment.

[0031] The timepiece 100 of the present embodiment is an analog three-hand mechanical timepiece.

[0032] Figure 1 The timepiece 100 shown is a wristwatch worn on a user's wrist, and has a cylindrical outer case 2, and a dial 3 is arranged on the inner circumference of the outer case 2. Of the two openings of the outer case 2, the front opening is closed by a glass cover, and the back opening is closed by a back cover.

[0033] The timepiece 100 includes a movement 10 housed in the outer case 2 , an hour hand 4A, a minute hand 4B, and a second hand 4C that display time information, and a power reserve hand 5 that indicates the duration of a mainspring (not shown) included in the movement 10 .

[0034] Each of the hands 4A to 4C and the power storage hand 5 is mounted on a hand shaft of the movement 10 and driven by the movement 10. In addition, the power storage function may be omitted.

[0035] The dial 3 is provided with a small calendar window 3A, and the date wheel 6 can be visually viewed through the small calendar window 3A.

[0036] A crown 7 is provided on the side surface of the outer case 2. The crown 7 can be pulled out two steps from a normal position (0-step position) in which it is pushed toward the center of the timepiece 100.

[0037] When the crown 7 is rotated at the 0-stage position, the mainspring can be wound as described later. The power storage hand 5 moves in conjunction with the winding of the mainspring. When the mainspring is fully wound, the timepiece 100 of this embodiment can ensure a duration of about 40 hours.

[0038] When the crown 7 is pulled to the first position and rotated, the date wheel 6 can be moved to adjust the date. When the crown 7 is pulled to the second position, the second hand 4C stops, and when the crown 7 is rotated at the second position, the hour hand 4A and the minute hand 4B move to adjust the time.

[0039] Figure 2 This is a perspective top view of the movement.

[0040] The movement 10 has a bottom plate 11, a first bridge 12, and a balance spring bridge 13. Between the bottom plate 11 and the first bridge 12, a barrel wheel (first wheel) 21 storing a mainspring, a second wheel (not shown), a third wheel 23, a fourth wheel 24, and an escape wheel 29 are arranged.

[0041] Furthermore, a pallet fork 53 , a governor 55 , and the like are disposed between the main plate 11 and the balance-spring bridge 13 .

[0042] The manual winding mechanism 30 includes a stem 31 rotatably supported on the first bridge 12, a clutch wheel 32, a vertical wheel 33, a small steel wheel 40, a first intermediate wheel 51, and a second intermediate wheel 52. The rotation based on the rotation operation of the crown 7 is transmitted to the large steel wheel 60, so that the large steel wheel 60 and the barrel arbor are rotated to wind the mainspring. In addition, the small steel wheel 40 is composed of a first small steel wheel 41 meshed with the vertical wheel 33 and a second small steel wheel 42 that rotates integrally with the first small steel wheel 41 and meshed with the first intermediate wheel 51.

[0043] ***Structure of the speed regulator***

[0044] Figure 3 It is a cross-sectional view of the speed regulator. Figure 4 It is a three-dimensional picture of the hairspring.

[0045] like Figure 3 As shown, the speed regulator 55 has a balance spring mechanism 400 .

[0046] The balance wheel and hairspring mechanism 400 includes a balance staff 410 , a balance wheel 420 , an inner stud 56 , an outer stud 15 , an index finger 460 and a hairspring 8 .

[0047] The balance shaft 410 is rotatably supported by the bottom plate 11 and the balance-spring mechanism bridge 13. Therefore, the bottom plate 11 and the balance-spring mechanism bridge 13 are supporting members that axially support the balance shaft 410. The balance wheel 420, the double disc 430, and the collet 56 are fixed to the balance shaft 410, and they are configured to rotate integrally.

[0048] The speed needle 460 is configured to include an adjustment rod 461 and a stopper 462 .

[0049] Figure 4 It is observed from the bottom plate 11 side Figure 3 A three-dimensional view of the balance spring 8 in FIG.

[0050] like Figure 4 As shown, the inner end 81 of the hairspring 8 is fixed to the inner stud 56, and the outer end 82 is fixed to the outer stud 15. In a preferred example, the hairspring 8 is formed of a plate-shaped elastic material such as Co-Elinvar, which is an alloy containing Cr, Ni, Co, etc. In addition, any plate-shaped elastic material can be used, for example, silicon. In other words, the balance spring mechanism 400 includes: a balance shaft 410 rotatably supported by a supporting member; a balance wheel 420 fixed to the balance shaft 410; an inner stud 56 fixed to the balance shaft 410; and a hairspring 85 with an outer stud.

[0051] like Figure 3As shown, in such a speed regulator 55, when the balance wheel 420 rotates with the balance shaft 410 as the axis, the stud 56 also rotates accordingly, so that the force of the hairspring 8 acts on the balance wheel 420. When the force is balanced with the inertia force of the balance wheel 420, the rotation of the balance wheel 420 stops, and the balance wheel 420 rotates in the opposite direction by the force of the hairspring 8. That is, the balance wheel 420 repeatedly swings with the balance shaft 410 as the axis.

[0052] *** Structure of the external pile ***

[0053] Figure 5 It is a three-dimensional image of a hairspring with an external stud.

[0054] Figure 5 Observe from different angles Figure 4 A perspective view of the peripheral portion of the outer pile 15 in FIG.

[0055] like Figure 5 As shown, the stud 15 is configured by including a support portion 17 and a stud clamp portion 18 on a cylindrical base portion 16 .

[0056] The clip portion 18 is a portion that supports and fixes the outer end portion 82 of the hairspring 8. The clip portion 18 is in the shape of a truncated cone and is composed of a pair of side walls 19a, 19b, a slit portion 25, a groove 35, etc. The groove 35 is an annular groove formed by digging into the outer circumference between the support portion 17 and the clip portion 18.

[0057] like Figure 5 As shown, the outer end portion 82 of the hairspring 8 is fixed to the stud 18 by the adhesive 44 while being inserted through the slit portion 25. In addition, the component in which the outer end portion 82 of the hairspring 8 is fixed to the stud 15 and integrated is referred to as a hairspring 85 with a stud. Here, the adhesive 44 is filled in the inside of the slit portion 25 and the entire circumference of the groove 35 to be integrated. As a result, the adhesive 44 in the groove 35 serves as a locking portion, so that the adhesive 44 can be prevented from falling out of the slit portion 25. In other words, the hairspring 8 can be prevented from falling out of the stud 15. In addition, the manufacturing method including the filling of the adhesive 44 will be described later.

[0058] Figure 6 is a three-dimensional diagram of the outer pile, Figure 5 correspond. Figure 7 is the side view of the outer pile, and Figure 6 correspond. Figure 8 yes Figure 7 An enlarged view of part b. Fig. 9 is a top view of the outer pile, and Figure 7 In the following description, the side of the balance with hairspring bridge 13 is also referred to as the lower side, and the side of the slit portion 25 of the pile clip portion 18 is also referred to as the upper side. In addition, the upper surface of the balance with hairspring bridge 13 is also referred to as the reference surface 13b.

[0059] like Figure 6 , Figure 7 As shown, the stud 15 is a cylindrical member vertically erected from the balance spring mechanism bridge 13. The stud 15 is composed of a pedestal portion 16 inserted and fixed to the balance spring mechanism bridge 13, a support portion 17, a stud clamp portion 18, etc. In addition, in a preferred example, the material of the stud 15 is brass. In addition, it is not limited to this, as long as it is a metal, for example, zinc white copper can also be used.

[0060] The support portion 17 is a cylindrical portion that is thinner than the base portion 16. The upper portion of the support portion 17 is formed into a tapered truncated cone shape along the outer shape of the hairspring stud portion 18, but the entirety is cylindrical. The stud portion 18 is a portion having a tapered truncated cone shape that tapers from the upper portion of the support portion 17. A slit portion 25 is formed in the upper portion of the stud portion 18. The shapes of the support portion 17 and the stud portion 18 are not limited thereto, and any shape may be used as long as the slit portion 25 can be formed. For example, the stud portion 18 may be cylindrical.

[0061] like Figure 7 As shown in FIG. 1 , the slit portion 25 is a rectangular cutout portion cut out at a pair of side surfaces 26a, 26b and a bottom surface 27. In addition, the side walls 19a and 19b are portions divided by the slit portion 25, and the side wall 19a has the side surface 26a, and the side wall 19b has the side surface 26b. In addition, the line segment passing through the center of the pile clamp portion 18 is defined as the center line 62. The center line 62 is a line segment perpendicular to the reference surface 13b. In other words, the pile clamp portion 18 is provided on the support portion 17, and has the slit portion 25 for inserting and fixing the hairspring 8. Moreover, the pile clamp portion 18 is in the shape of a truncated cone centered on the center line 62 passing through the center of the cylinder.

[0062] like Figure 7 As shown, the groove 35 is an annular groove formed by being provided between the support portion 17 and the pile clamp portion 18 and being dug into the outer circumference. In other words, the groove 35 forming a constriction is provided on the outer circumference between the support portion 17 and the pile clamp portion 18. Furthermore, the groove 35 goes around the outer circumference of the cylinder.

[0063] like Figure 8 As shown, the groove 35 is composed of the following parts: a first surface 35a which is parallel to the center line 62 and forms the bottom of the groove 35; a second surface 35b which intersects the first surface 35a and is close to the pile clamp 18; and a third surface 35c which intersects the first surface 35a and is close to the support portion 17. In a preferred example, the third surface 35c is parallel to the upper surface 36 of the support portion 17. The upper surface 36 of the support portion 17 is parallel to the reference surface 13b. In addition, the parallelism in this embodiment includes not only complete parallelism, but also substantial parallelism within a certain error range. In addition, it is not limited to this structure, and the third surface 35c can also be inclined to the lower side of the center line 62. For example, as Figure 8 As shown in FIG. 1 , the third surface 35c may also be inclined at an angle θ relative to the upper surface 36 of the support portion 17. The angle θ is an inclination toward the lower side of the center line 62. Thus, the adhesive 44 ( Figure 5 ) further enters the groove 35, thereby improving the anti-falling effect of the adhesive 44.

[0064] In other words, the groove 35 includes: a first surface 35 a which is parallel to the center line 62 and forms the bottom of the groove 35; a second surface 35 b which intersects with the first surface 35 a and is close to the pile clamping portion 18; and a third surface 35 c which intersects with the first surface 35 a and is close to the support portion 17. The third surface 35 c is parallel to the upper surface 36 of the support portion 17 or is inclined to the lower side of the center line 62.

[0065] In addition, in the above description, the groove 35 is a trapezoidal groove whose cross section has a first surface 35a, a second surface 35b, and a third surface 35c, but it is not limited to this. As long as it is a groove dug into the circumference, it can be, for example, a semicircular, triangular, or rectangular groove.

[0066] like Figure 7 As shown in FIG. 1 , the bottom surface 27 of the slit portion 25 is located approximately in the center of the groove 35. In addition, it is not limited to being located approximately in the center, and the bottom surface 27 of the slit portion 25 may reach the groove 35 and be located above the third surface 35c of the groove 35. In other words, the slit portion 25 is a cutout portion formed from the upper surface toward the bottom surface of the truncated cone-shaped stud clip portion 18, and enters a part of the groove 35. Moreover, the bottom surface 27 of the slit portion 25 is located above the third surface 35c of the groove 35. Furthermore, the stud 15 is a stud 15 having the slit portion 25 for receiving and fixing the hairspring 8, and has the groove 35 formed as a constriction on the outer periphery of the position overlapping with the bottom surface 27 of the slit portion 25.

[0067] like Fig. 9 As shown, a hole 28 is provided at the center of the pile clamp portion 18. The hole 28 is a circular hole centered on the center line 62, and is formed to a depth reaching the middle of the support portion 17.

[0068] In the side wall 19a, a pair of side surfaces 26a are arranged in a straight line across the hole 28. The inner peripheral edge of the side wall 19a is in an arc shape along the hole 28. Similarly, in the side wall 19b, a pair of side surfaces 26b are arranged in a straight line across the hole 28. The inner peripheral edge of the side wall 19b is in an arc shape along the hole 28. In this way, by providing the hole 28 at the lower part of the slit portion 25, when the adhesive 44 is filled, the adhesive 44 also enters the hole 28, and the bonding strength can be further improved.

[0069] ***Manufacturing method of hairspring with external stud***

[0070] Fig.101 is a flowchart showing the flow of a method for manufacturing a hairspring with a stud.

[0071] Here, the process of the manufacturing method of the hairspring 85 with an external stud is as follows. Fig.10 The invention is mainly described in conjunction with other drawings as appropriate.

[0072] In step S11, the stud 15 is prepared. In other words, the stud 15 having the slit portion 25 for receiving and fixing the outer end portion 82 of the hairspring 8 and the groove 35 formed on the outer circumference is prepared.

[0073] In step S12, Figure 5 As shown, the outer end portion 82 of the hairspring 8 is provided so as to be inserted through the slit portion 25 of the stud 15 .

[0074] In step S13, Figure 5 As shown in FIG. 1 , the adhesive 44 is filled in such a manner that the inside of the slit portion 25 and the groove 35 are completely filled. In other words, the adhesive 44 is filled in the slit portion 25 in a state where the outer end portion 82 of the hairspring 8 is placed in the slit portion 25. Then, the adhesive 44 is filled in such a manner that the groove 35 is also filled. In addition, the order of step S12 and step S13 may be reversed. Specifically, after the adhesive 44 is filled in such a manner that the inside of the slit portion 25 and the groove 35 are completely filled, the outer end portion 82 of the hairspring 8 may be set in the slit portion 25. Even in this order, since the adhesive 44 wraps around the outer end portion 82 of the hairspring 8, the adhesive 44 can be filled in the slit portion 25 and the groove 35 in the same manner as described above in a state where the outer end portion 82 of the hairspring 8 is set. In other words, the step of filling the gap 25 with the adhesive 44 while the outer end 82 of the hairspring 8 is inserted into the gap 25 also includes a method of providing the outer end 82 of the hairspring 8 after the adhesive 44 is filled.

[0075] In a preferred embodiment, an ultraviolet curing adhesive is used as the adhesive 44. Moreover, the viscosity of the adhesive 44 before curing is preferably 400 mPa·s or more and 600 mPa·s or less. By setting it to this viscosity, it will not be too soft and become a moderate viscosity, so the workability is good and an appropriate amount can be filled in a necessary place.

[0076] In step S14, the filled adhesive 44 is uniformly irradiated with ultraviolet rays to cure the adhesive 44. In other words, in the curing step, the adhesive 44 is cured while existing in the groove 35. That is, the adhesive 44 exists in a position including the slit portion 25 and the groove 35.

[0077] Therefore, if Figure 5As shown in FIG. 1 , the outer end portion 82 of the hairspring 8 is fixed to the clip portion 18 by adhesive 44 while being inserted through the slit portion 25. Here, the adhesive 44 is filled in the interior of the slit portion 25 including the hole 28 and the entire circumference of the groove 35, and is firmly integrated. Therefore, the adhesive 44 in the groove 35 serves as a locking portion, and the adhesive 44 can be prevented from falling out of the slit portion 25. In other words, the adhesive 44 in the groove 35 flows back and forth, and exerts an anchoring effect, and the adhesive 44 can be prevented from falling out of the slit portion 25.

[0078] The adhesive 44 is not limited to an ultraviolet curing adhesive, and may be any adhesive that can maintain a strong bond after curing, and may be, for example, an epoxy adhesive, a hot melt adhesive, or a metal solder such as brazing material.

[0079] As described above, according to the stud 15, the hairspring with a stud 85, the balance with hairspring 400, the timepiece 100, and the method for manufacturing the hairspring with a stud 85 of the present embodiment, the following effects can be obtained.

[0080] The stud 15 includes a cylindrical support portion 17 and a stud 18, which is provided on the support portion 17 and has a slit portion 25 for receiving and fixing the hairspring 8. The stud 18 is in the shape of a truncated cone centered on a center line 62 passing through the center of the cylinder, and a groove 35 forming a constriction is provided on the outer periphery between the support portion 17 and the stud 18. The slit portion 25 is a cutout portion formed from the upper surface of the truncated cone-shaped stud 18 toward the bottom surface, and enters a part of the groove 35.

[0081] Thus, the groove 35 that functions as a locking portion for preventing the adhesive 44 from falling off is formed along the outer periphery of the cylindrical outer pile 15, so it can be formed by processing the outer pile 15 in the circumferential direction. Therefore, unlike the previous outer piles that require other processes such as hole processing on the side wall of the slit portion, the processing time is small and the manufacturing efficiency is good. In particular, since the outer pile 15 is a small component with a height of about several mm, it is not easy to change the production adjustment of the machine tool. If the same machine tool can be used to process the groove 35, the manufacturing efficiency is good. In addition, the adhesive 44 in the annular groove 35 returns, exerts an anchoring effect, and can prevent the adhesive 44 from falling off from the slit portion 25.

[0082] Therefore, it is possible to provide the stud 15 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0083] The groove 35 includes a first surface 35 a which is parallel to the center line 62 and forms the bottom of the groove 35 ; a second surface 35 b which intersects the first surface 35 a and is on the side of the pile clip 18 ; and a third surface 35 c which intersects the first surface 35 a and is on the side of the support portion 17 , and the third surface 35 c is parallel to the upper surface 36 of the support portion 17 or is inclined below the center line 62 .

[0084] Thus, the adhesive 44 filling the groove 35 enters through the groove 35 , and thus the effect of preventing the adhesive 44 from falling off can be enhanced.

[0085] In addition, the bottom surface 27 of the slit portion 25 is located above the third surface 35 c of the groove 35 .

[0086] Thus, the adhesive 44 filled in the slit portion 25 and the adhesive 44 filled in the groove 35 merge into the groove 35 , so that the adhesives 44 can be integrated.

[0087] Furthermore, the groove 35 goes around the outer circumference of the cylinder of the stud 15 .

[0088] Thus, the adhesive 44 filled in the groove 35 also has an annular shape, so that the locking portion has a strong structure and can prevent the adhesive 44 from falling off.

[0089] In addition, the outer end portion 82 of the hairspring 8 is joined to the stud 15 by the adhesive 44. The stud 15 is provided with a slit portion 25 for receiving and fixing the outer end portion 82 of the hairspring 8, and a groove 35 formed on the outer periphery. The slit portion 25 enters a part of the groove 35, and the adhesive 44 is present at a position including the slit portion 25 and the groove 35.

[0090] Thus, it is possible to provide a hairspring with a stud 85 having a stud 15 that is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0091] The balance wheel and hairspring mechanism 400 includes: a hairspring 85 with a stud; a balance staff 410 rotatably supported by a support member; a balance wheel 420 fixed to the balance staff 410 ; and a stud 56 fixed to the balance staff 410 .

[0092] Thus, it is possible to provide a balance with hairspring 400 having a stud 15 that is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0093] Furthermore, the timepiece 100 includes a balance with hairspring 400 and a movement 10 including the balance with hairspring 400 .

[0094] Thus, it is possible to provide a timepiece 100 having a stud 15 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0095] The manufacturing method of the hairspring 85 with an external stud includes: a step of preparing the external stud 15 having the slit portion 25 for receiving and fixing the outer end portion 82 of the hairspring 8 and the groove 35 formed on the outer periphery; a step of filling the slit portion 25 with the adhesive 44 in a state where the outer end portion 82 of the hairspring 8 is placed in the slit portion 25; and a curing step of curing the adhesive 44, in which the adhesive 44 is filled in the filling step so that the adhesive 44 also enters the groove 35, and in the curing step, the adhesive 44 is cured in a state where it exists in the groove 35.

[0096] This makes it possible to efficiently manufacture the stud 15 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0097] Stud 15 has slit portion 25 for receiving and fixing hairspring 8 , and has constricted groove 35 formed on the outer periphery at a position overlapping bottom surface 27 of slit portion 25 .

[0098] Thus, the groove 35 that functions as a locking portion for preventing the adhesive 44 from falling off is formed along the outer periphery of the cylindrical external pile 15, and can therefore be formed by processing the external pile 15 in the circumferential direction. Therefore, unlike the previous external piles that require other processes such as drilling the side wall of the slit portion, the processing time is small and the manufacturing efficiency is good. Moreover, the adhesive 44 in the annular groove 35 is returned, and the anchoring effect is exerted, which can prevent the adhesive 44 from falling off from the slit portion 25.

[0099] Therefore, it is possible to provide the stud 15 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0100] Implementation Method 2

[0101] ***DIFFERENT FORMS***

[0102] Fig.11 is a side view of the outer pile of embodiment 2, and Figure 7 correspond. Fig.12 It is a three-dimensional picture of different types of external piles, Figure 7 correspond.

[0103] In the above embodiment, the case where one groove 35 is formed in the pile clip portion 18 of the stud 15 is described, but the present invention is not limited thereto, and the grooves may be plural or spiral. Hereinafter, the same reference numerals are given to the same parts as in the above embodiment, and repeated descriptions are omitted.

[0104] like Fig.11 As shown, the outer stud 45 of the present embodiment has two grooves 38 a and 38 b on the outer periphery of the stud clip portion 18 .

[0105] The groove 38 a is a first groove, and is the same as the groove 35 in the first embodiment.

[0106] The groove 38b is a second groove and is provided above the groove 38a. The groove 38b is divided into the side wall 19a side and the side wall 19b side by the slit portion 25. In other words, the grooves are the groove 38a as the first groove including the bottom surface 27 of the slit portion 25 and the groove 38b as the second groove above the groove 38a and divided by the slit portion 25.

[0107] In the stud 45 , the adhesive 44 is filled in the bonding step so as to fill up the inside of the slit 25 and the grooves 38 a and 38 b .

[0108] Thus, since the grooves functioning as the locking portion for preventing the adhesive 44 from falling off are the groove 38 a and the groove 38 b , stronger bonding can be achieved.

[0109] like Fig.12 As shown in FIG. 1 , the outer pile 46 of this embodiment has a spiral groove 39 on the outer periphery of the pile clip 18. In a preferred example, the groove 39 surrounds the outer periphery of the pile clip 18 three times, but it only needs to be one or more times. The bottom surface 27 of the slit 25 enters the bottommost groove of the groove 39. In other words, the groove 39 surrounds the outer periphery of the cylindrical pile clip 18 in a spiral shape for at least one time.

[0110] In the stud 46 , the adhesive 44 is filled in the bonding step so as to fill up the inside of the slit 25 and the spiral groove 39 .

[0111] Thus, the groove that functions as a locking portion for preventing the adhesive 44 from falling off is formed into a three-circle spiral groove 39, so that stronger bonding can be achieved.

[0112] As described above, according to the studs 45 and 46 of the present embodiment, in addition to the effects of the above-described embodiment, the following effects can be obtained.

[0113] The grooves of the stud 45 are composed of two grooves: a first groove 38 a including the bottom surface 27 of the slit portion 25 and a second groove 38 b located above the groove 38 a and divided by the slit portion 25 .

[0114] Thus, the two grooves 38a and 38b are formed along the outer circumference of the cylindrical stud 45 and can be formed by processing the stud 45 in the circumferential direction, so that the processing man-hours are reduced and the manufacturing efficiency is improved. In addition, the adhesive 44 can be prevented from falling off.

[0115] Therefore, it is possible to provide the stud 45 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0116] Furthermore, the groove 39 of the stud 46 spirally circles at least once along the outer circumference of the cylindrical stud clip 18 .

[0117] Thus, the spiral groove 39 is formed along the outer circumference of the cylindrical stud 46 and can be formed by machining the stud 46 in the circumferential direction, so that machining man-hours are reduced and manufacturing efficiency is improved. Furthermore, the adhesive 44 can be prevented from falling off.

[0118] Therefore, it is possible to provide the stud 46 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0119] Implementation 3

[0120] ***Different ways of bonding***

[0121] Fig.13 3 is a perspective view of a hairspring with an outer stud according to Embodiment 3, Figure 5 correspond.

[0122] In the above embodiment, the adhesive 44 before curing is liquid, but the present invention is not limited thereto, and a solid adhesive member may be used. Hereinafter, the same reference numerals are given to the same parts as those in the above embodiment, and repeated descriptions are omitted.

[0123] like Fig.13 As shown, in this embodiment, it is different from the description of Embodiment 1 that an adhesive member 48 which is solid in an initial state before curing is used as an adhesive.

[0124] The adhesive member 48 is cylindrical and is shaped to be received in the slit portion 25 of the stud 15. The diameter of the adhesive member 48 is slightly smaller than the hole 28 in the upper portion of the stud 15, and a cutout portion 49 corresponding to the outer end portion 82 of the hairspring 8 is provided on the lower surface. The adhesive member 48 is, for example, thermoplastic adhesive particles mainly composed of a natural resin such as insect body covering, or a synthetic resin such as phenolic resin, polyamide resin, ethylene vinyl acetate, or the like.

[0125] In the adhesive filling step, the adhesive member 48 is placed in the gap 25, and in the curing step, the adhesive member 48 is heated to melt. When the adhesive member 48 melts, the inside of the gap 25 and the entire circumference of the groove 35 are filled with the melted adhesive member. Then, it is cooled for a predetermined time to solidify. In this way, it is possible to perform bonding with the adhesive member 48. Figure 5 The adhesive 44 of the adhesive member 48 is bonded and fixed in the same manner. In addition, the cutout portion 49 of the adhesive member 48 can also be omitted. The adhesive member 48 is a soft resin particle, so even if there is no cutout portion 49, it will deform and be accommodated in the interior of the slit portion 25 as long as it is pressed in.

[0126] In other words, the adhesive is a solid adhesive member 48 , and in the adhesive filling step, the adhesive member 48 is placed in the slit portion 25 , and in the curing step, the adhesive member 48 is heated and melted, and then cooled and cured.

[0127] As described above, according to the stud 15 and the adhesive member 48 of the present embodiment, in addition to the effects of the above-described embodiment, the following effects can be obtained.

[0128] The adhesive is a solid adhesive member 48 . In the adhesive filling step, the adhesive member 48 is placed in the slit portion 25 . In the curing step, the adhesive member 48 is heated and melted, and then cooled and cured.

[0129] Thus, it is sufficient to only provide the adhesive member 48 in the slit portion 25, which is simpler than a liquid-filled adhesive and has good manufacturing efficiency. In addition, it is possible to prevent the adhesive from falling off.

[0130] Therefore, it is possible to provide a method for manufacturing the hairspring 85 with a stud which is excellent in manufacturing efficiency and can prevent the adhesive from coming off.

Claims

1. An external pile, comprising: A supporting portion, which is cylindrical; and The pile clamp part is arranged on the supporting part and has a slit part for placing and fixing the hairspring. The pile clamp portion is in the shape of a truncated cone centered on a center line passing through the center of the cylinder. A groove forming a neck is provided on the outer periphery between the support portion and the pile clamp portion. The slit portion is a cutout portion formed from the upper surface toward the bottom surface of the pile clamp portion having a truncated cone shape, and enters a portion of the groove.

2. The external pile according to claim 1, wherein: The tank comprises: a first surface, which is parallel to the center line and forms the bottom of the groove; a second surface intersecting the first surface and close to the pile clamping portion; and a third surface intersecting the first surface and close to the support portion; The third surface is parallel to the upper surface of the support portion, or is inclined toward the lower side of the center line.

3. The external pile according to claim 2, wherein: The bottom surface of the slit portion is located above the third surface of the groove.

4. The external pile according to claim 1, wherein: The groove goes around the outer circumference of the cylinder.

5. The external pile according to claim 3, wherein: The grooves include two grooves, a first groove and a second groove, wherein the first groove includes the bottom surface of the slit portion, and the second groove is located above the first groove and is divided by the slit portion.

6. The external pile according to claim 1, wherein: The groove spirally circles at least once along the outer circumference of the cylinder.

7. A hairspring with an outer stud, wherein the hairspring with an outer stud is formed by bonding the end of the hairspring to the outer stud by means of an adhesive. The stud is provided with a slit for receiving and fixing the end of the hairspring and a groove formed on the outer circumference. The slit portion enters a portion of the groove, The adhesive is present at a position including the slit portion and the groove.

8. A balance spring mechanism, comprising: The hairspring with an external stud as claimed in claim 7; A swing shaft rotatably supported on a supporting member; a balance wheel fixed to the balance shaft; and An inner pile fixed to the swing shaft.

9. A timepiece comprising: The balance spring mechanism according to claim 8; and A movement having the balance spring mechanism.

10. A method for manufacturing a hairspring with an external stud, the method comprising: A step of preparing a stud having a slit portion for receiving and fixing an end of a hairspring and a groove formed on an outer circumference thereof; a step of filling the interior of the slit with an adhesive while the end of the hairspring is placed in the slit; and a curing step of curing the adhesive, In the step of filling the adhesive, the adhesive is filled in such a way that the adhesive also enters the groove. In the curing step, the adhesive is cured while being present in the groove.

11. The method for manufacturing a hairspring with an external stud according to claim 10, wherein: The adhesive has a viscosity of 400 mPa·s or more and 600 mPa·s or less.

12. The method for manufacturing a hairspring with an external stud according to claim 10, wherein: The adhesive is a solid bonding component. In the adhesive filling step, the adhesive member is placed in the gap. In the curing step, the adhesive member is heated and melted, and then cooled and cured.

13. A stud having a slit for receiving and fixing a hairspring, A groove forming a constriction is provided on the outer periphery of a position overlapping with the bottom surface of the slit portion.

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