Stud, hair spring with stud, method for manufacturing the same, balance, and watch

Abstract

To provide a stud that is excellent in manufacturing efficiency and can prevent fall-off of an adhesive.SOLUTION: A stud includes a support part having a columnar shape, and a stud support provided on the support part and having a slit part for holding and fixing a hair spring. The stud support has a truncated cone shape centered on a center line passing through the center of the column. A groove forming constriction on an outer periphery is provided between the support part and the stud support. The slit part is a notch formed from a top face toward a bottom face of the stud support in the truncated cone shape, and is formed into a part of the groove.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a stud, a hairspring with a stud, a method for manufacturing the same, a balance, and a timepiece equipped with the balance. [Background technology]

[0002] Mechanical watches use a hairspring in the regulating mechanism. Because the hairspring, which is a spiral spring, maintains the accuracy of the hand movement, the end of the hairspring is glued to the stud and then touched directly to adjust it. In this case, there is a concern that the hairspring may come off the stud if the fixation strength is insufficient. For this reason, a technology has been proposed to firmly glue the end of the hairspring to the stud.

[0003] For example, in Patent Document 1, a through hole is opened in the side wall of the slit where the end of the hairspring of the stud is set, and the adhesive is filled inside the slit so that the adhesive is also filled in the through hole (for example, Fig. 1C). As a result, when the adhesive hardens, the adhesive in the through hole becomes a locking part, preventing the adhesive from falling out of the slit. Also, instead of a through hole, a notch may be formed in the lower part of the side wall of the slit (for example, Fig. 2D). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-200199 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the stud in Patent Document 1 had a problem in that the structure was complex and required many processing steps. In detail, the cylindrical stud is basically processed in the circumferential direction, but the processing of the linear slit portion is a separate process, and the drilling of holes in the side walls of the slit portion is a separate process, which required many processing steps and resulted in poor manufacturing efficiency. In other words, there has been a demand for a retainer that is excellent in manufacturing efficiency and can prevent the adhesive from falling off. [Means for solving the problem]

[0006] A hairspring holder in one embodiment of the present application includes a cylindrical support portion and a hairspring holder provided on the support portion and having a slit portion for inserting and fixing the hairspring, the hairspring holder being shaped like a truncated cone centered on a center line passing through the center of the cylinder, a groove forming a narrowing on the outer periphery is provided between the support portion and the hairspring holder, and the slit portion is a cutout portion formed from the top surface toward the bottom surface of the truncated cone-shaped hairspring holder, and extends into a portion of the groove.

[0007] 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 the stud with adhesive, the stud being provided with a slit portion for inserting and fixing the end of the hairspring, and a groove formed on the outer periphery, the slit portion extending into a part of the groove, and the adhesive being present including the slit portion and the groove.

[0008] A method for manufacturing a hairspring with a stud according to one embodiment of the present application includes the steps of: preparing a stud having a slit portion for inserting and fixing an end of the hairspring and a groove formed on the outer periphery; filling the inside of the slit portion with adhesive while the end of the hairspring is inserted in the slit portion; and hardening the adhesive, wherein in the adhesive filling step, the adhesive is filled so that it also enters the groove, and in the hardening step, the adhesive is hardened while present in the groove.

[0009] A balance according to one aspect of the present application has the above-mentioned hairspring with stud, a balance arbour supported rotatably on a receiver member, a balance wheel fixed to the balance arbour, and a collet fixed to the balance arbour.

[0010] A timepiece according to one aspect of the present application comprises the above-mentioned balance and a movement having the balance.

[0011] A stud according to one aspect of the present application is a stud having a slit portion for inserting and fixing the hairspring, and has a groove forming a constriction on the outer periphery at a position overlapping with the bottom surface of the slit portion. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a plan view of a timepiece according to a first embodiment. [Diagram 2] Transparent plan view of the movement. [Diagram 3] Cross-sectional view of a governor. [Figure 4] A perspective view of a hairspring. [Diagram 5] A perspective view of a hairspring with a stud. [Figure 6] A perspective view of a beard holder. [Figure 7] Side view of a bearded man. [Figure 8] An enlarged view of part b in Figure 7. [Figure 9] Top view of the shave. [Figure 10] FIG. 4 is a flowchart showing the steps of a manufacturing method for a stud hairspring. [Figure 11] FIG. 7 is a side view of a holder according to a second embodiment. [Figure 12] FIG. [Figure 13] FIG. 11 is a perspective view of a stud hairspring according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] EMBODIMENT 1 ***Clock Overview*** FIG. 1 is a plan view of the timepiece according to this embodiment. The timepiece 100 of this embodiment is an analog three-hand mechanical timepiece. 1 is a wristwatch worn on a user's wrist, and has a cylindrical exterior case 2 with a dial 3 disposed on the inner circumference of the exterior case 2. Of the two openings in the exterior case 2, the opening on the front side is closed with a cover crystal, and the opening on the back side is closed with a back cover.

[0014] The timepiece 100 also includes a movement 10 housed within an 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 the time provided by a spring (not shown) provided in the movement 10. The hands 4A to 4C and the power reserve hand 5 are attached to the axis of the movement 10 and are driven by the movement 10. The power reserve function may be omitted. The dial 3 is provided with a small calendar window 3A, through which the date wheel 6 can be seen.

[0015] A crown 7 is provided on the side of the exterior case 2. The crown 7 can be pulled out two steps from the normal position (0 step position) in which it is pushed toward the center of the timepiece 100. When the crown 7 is rotated to the 0 position, the mainspring can be wound up as described below. The power reserve hand 5 moves in conjunction with the winding of the mainspring. The timepiece 100 of this embodiment can ensure a running time of about 40 hours when the mainspring is fully wound. When the crown 7 is pulled out to the first position and rotated, the date wheel 6 moves and the date can be adjusted. When the crown 7 is pulled out to the second position, the second hand 4C stops, and when the crown 7 is rotated in the second position, the hour hand 4A and minute hand 4B move and the time can be adjusted.

[0016] FIG. 2 is a transparent plan view of the movement. The movement 10 includes a main plate 11, a first bridge 12, and a balance bridge 13. Between the main plate 11 and the first bridge 12, there are arranged a barrel wheel (first wheel) 21 housing a mainspring, a second wheel (not shown), a third wheel 23, a fourth wheel 24, and an escape wheel 29. Between the main plate 11 and the balance cock 13, an anchor 53, a governor 55, etc. are arranged.

[0017] The manual winding mechanism 30 includes a winding stem 31, a clutch wheel 32, a crown 33, a crown wheel 40, a first intermediate wheel 51, and a second intermediate wheel 52, all of which are rotatably supported on the first bridge 12, and transmits the rotation of the crown 7 to a ratchet wheel 60, which rotates the ratchet wheel 60 and the barrel arbor to wind up the mainspring. The crown wheel 40 is made up of a first crown wheel 41 that meshes with the crown wheel 33, and a second crown wheel 42 that rotates integrally with the first crown wheel 41 and meshes with the first intermediate wheel 51.

[0018] ***Governor configuration*** Fig. 3 is a cross-sectional view of the governor, and Fig. 4 is a perspective view of the hairspring. As shown in FIG. 3, the governor 55 includes a balance 400. The balance 400 is composed of a balance arbour 410, a balance wheel 420, a collet 56, a balance stud 15, a regulator pin 460, and a hairspring 8. The balance stem 410 is rotatably supported by the main plate 11 and the balance bridge 13. Therefore, the main plate 11 and the balance bridge 13 are support members that axially support the balance stem 410. A balance wheel 420, an impeller seat 430, and a collet 56 are fixed to the balance stem 410, and are configured to rotate integrally. The regulator 460 is configured to include a hairpin 461 and a stopper portion 462 .

[0019] FIG. 4 is a perspective view of the hairspring 8 in FIG. 3 as viewed from the main plate 11 side. As shown in Fig. 4, the hairspring 8 has an inner end 81 fixed to the collet 56 and an outer end 82 fixed to the stud 15. In a preferred embodiment, the hairspring 8 is made of a plate-shaped elastic material such as Coelinvar, which is an alloy containing Cr, Ni, Co, etc. Any plate-shaped elastic material may be used, and it may be made of silicon, for example. In other words, the balance 400 has a balance arbour 410 rotatably supported by a receiving member, a balance wheel 420 fixed to the balance arbour 410, a collet 56 fixed to the balance arbour 410, and a hairspring 85 with a stud. 3, in such a governor 55, when the balance wheel 420 rotates about the balance arbour 410, the collet 56 also rotates accordingly, so that the biasing force of the hairspring 8 acts on the balance wheel 420, and when this biasing force and the inertial force of the balance wheel 420 are balanced, the balance wheel 420 stops rotating and rotates in the opposite direction due to the biasing force of the hairspring 8. In other words, the balance wheel 420 repeatedly oscillates about the balance arbour 410.

[0020] *** Beard Composition *** FIG. 5 is a perspective view of a hairspring with a stud. FIG. 5 is a perspective view of the stud 15 and its surroundings in FIG. 4, seen from a different angle. As shown in FIG. 5, the stubble support 15 is configured to include a support portion 17 and a stubble receiving portion 18 disposed on a cylindrical base portion 16. The hairspring receiver 18 is a part that supports and fixes the outer end 82 of the hairspring 8. The hairspring receiver 18 is shaped like 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 between the support portion 17 and the hairspring receiver 18 by carving out the outer periphery.

[0021] As shown in FIG. 5, the outer end 82 of the hair spring 8 is inserted into the slit portion 25 and is adhesively fixed to the hairspring receiver 18 by the adhesive 44. The member in which the outer end 82 of the hair spring 8 is fixed to the stud 15 and integrated is called a hairspring with stud 85. The adhesive 44 is filled inside the slit portion 25 and all around the groove 35, and integrated. This makes it possible to prevent the adhesive 44 from falling off the slit portion 25, since the adhesive 44 in the groove 35 serves as an engagement portion. In other words, it is possible to prevent the hairspring 8 from coming off the stud 15. The manufacturing method, including filling with the adhesive 44, will be described later.

[0022] Fig. 6 is a perspective view of the stud and corresponds to Fig. 5. Fig. 7 is a side view of the stud and corresponds to Fig. 6. Fig. 8 is an enlarged view of part b in Fig. 7. Fig. 9 is a plan view of the stud and corresponds to Fig. 7. In the following description, the side of the balance cock 13 is also referred to as the bottom, and the side of the slit portion 25 of the balance cock 18 is also referred to as the top. The top surface of the balance cock 13 is also referred to as the reference surface 13b. As shown in Figures 6 and 7, the stud 15 is a cylindrical member that stands vertically from the balance cock 13. The stud 15 is made up of a base portion 16 that is inserted and fixed into the balance cock 13, a support portion 17, a balance receiver portion 18, etc. In a preferred embodiment, the material of the stud 15 is brass. However, this is not a limitation and any metal may be used, for example, nickel silver may be used.

[0023] The support portion 17 is a cylindrical portion that is slightly thinner than the base portion 16. The upper portion of the support portion 17 is tapered into a truncated cone shape that follows the outer shape of the bristles receiving portion 18, but is cylindrical overall. The bristles receiving portion 18 is a 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 bristles receiving portion 18. The shapes of the support portion 17 and the bristles receiving portion 18 are not limited to these, and may be any shape that allows the slit portion 25 to be formed. For example, the bristles receiving portion 18 may be cylindrical. As shown in FIG. 7, the slit portion 25 is a rectangular cutout portion cut out at a pair of side surfaces 26a, 26b and a bottom surface 27. The side walls 19a, 19b are divided by the slit portion 25, and the side wall 19a has a side surface 26a, and the side wall 19b has a side surface 26b. The line segment passing through the center of the hairspring receiver 18 is defined as a center line 62. The center line 62 is a line segment perpendicular to the reference surface 13b. In other words, the hairspring receiver 18 is provided on the support portion 17 and has a slit portion 25 for inserting and fixing the hairspring 8. The hairspring receiver 18 is shaped like a truncated cone centered on the center line 62 passing through the center of the cylinder.

[0024] As shown in Fig. 7, the groove 35 is provided between the support portion 17 and the bristles receiving portion 18, and is an annular groove formed by carving out the outer periphery. In other words, the groove 35 that forms a constriction on the outer periphery is provided between the support portion 17 and the bristles receiving portion 18. The groove 35 goes around the outer periphery of the cylinder. As shown in FIG. 8, the groove 35 is composed of a first surface 35a that is parallel to the center line 62 and is the bottom of the groove 35, a second surface 35b that intersects with the first surface 35a and is located on the side of the whisker receiving portion 18, and a third surface 35c that intersects with the first surface 35a and is located on the side of the support portion 17. In a preferred embodiment, 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 this embodiment, "parallel" includes not only perfect parallelism but also substantial parallelism within a certain error range. In addition, this is not limited to this configuration, and the third surface 35c may be inclined downward from the center line 62. For example, as shown in FIG. 8, the third surface 35c may be inclined at an angle θ with respect to the upper surface 36 of the support portion 17. The angle θ is the inclination downward from the center line 62. According to this, the adhesive 44 (FIG. 5) filled in the groove 35 penetrates further into the groove 35, so that the effect of preventing the adhesive 44 from falling off can be improved.

[0025] In other words, groove 35 includes a first surface 35a that is parallel to center line 62 and forms the bottom of groove 35, a second surface 35b that intersects with first surface 35a and is located on the whisker receiving portion 18 side, and a third surface 35c that intersects with first surface 35a and is located on the support portion 17 side, and third surface 35c is parallel to upper surface 36 of support portion 17 or inclined below center line 62. In the above, groove 35 has been described as being a trapezoidal groove whose cross section has a first surface 35a, a second surface 35b, and a third surface 35c. However, this is not limited to this and any groove formed by carving out a circumferential portion may be used. For example, the groove may be semicircular, triangular, or rectangular.

[0026] As shown in FIG. 7, the bottom surface 27 of the slit portion 25 is located approximately in the center of the groove 35. However, this is not limited to approximately in the center, and it is sufficient that the bottom surface 27 of the slit portion 25 reaches the groove 35 and is located above the third surface 35c of the groove 35. In other words, the slit portion 25 is a cutout portion formed from the top surface to the bottom surface of the truncated cone-shaped hairspring receiver 18, and extends into a part of the groove 35. The bottom surface 27 of the slit portion 25 is located above the third surface 35c of the groove 35. The stud 15 has a slit portion 25 for inserting and fixing the hairspring 8, and has a groove 35 forming a constriction on the outer periphery at a position overlapping with the bottom surface 27 of the slit portion 25.

[0027] 9, a hole 28 is provided in the center of the bristles receiving portion 18. The hole 28 is a circular hole centered on the center line 62, and is formed to a depth reaching approximately the middle of the support portion 17. In side wall 19a, a pair of side surfaces 26a are arranged in a straight line straddling hole 28. The inner peripheral edge of side wall 19a forms an arc shape along hole 28. Similarly, in side wall 19b, a pair of side surfaces 26b are arranged in a straight line straddling hole 28. The inner peripheral edge of side wall 19b forms an arc shape along hole 28. In this way, by providing hole 28 at the bottom of slit portion 25, when adhesive 44 is filled, adhesive 44 also enters hole 28, and the adhesive strength can be further increased.

[0028] ***How ​​to make a hairspring with a stud*** FIG. 10 is a flow chart showing the flow of a method for manufacturing a stud hairspring. Here, the flow of the manufacturing method of the stud hairspring 85 will be explained mainly with reference to FIG. 10, and with other figures as appropriate.

[0029] In step S11, the stud 15 is prepared. In other words, the stud 15 is prepared, which has 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.

[0030] In step S12, as shown in FIG. 5, the outer end portion 82 of the hairspring 8 is inserted into the slit portion 25 of the stud 15 and set.

[0031] In step S13, as shown in FIG. 5, the adhesive 44 is filled in the slit portion 25 and the groove 35. In other words, the adhesive 44 is filled in the slit portion 25 with the outer end 82 of the hairspring 8 inserted in the slit portion 25. The adhesive 44 is then filled in so as to penetrate into the groove 35 as well. The order of steps S12 and S13 may be reversed. In particular, the adhesive 44 may be filled in the slit portion 25 and the groove 35 to fill the inner portion of the slit portion 25 and the groove 35, and then the outer end 82 of the hairspring 8 may be set in the slit portion 25. Even in this order, the adhesive 44 envelops the outer end 82 of the hairspring 8, so that the adhesive 44 can be filled in the slit portion 25 and the groove 35 with the outer end 82 of the hairspring 8 set, as described above. In other words, the process of filling the inside of the slit portion 25 with adhesive 44 while the outer end portion 82 of the hairspring 8 is inserted into the slit portion 25 also includes a method of setting the outer end portion 82 of the hairspring 8 after filling the adhesive 44. In a preferred embodiment, an ultraviolet-curing adhesive is used as the adhesive 44. The viscosity of the adhesive 44 before curing is preferably 400 mPa·s or more and 600 mPa·s or less. This viscosity provides an appropriate viscosity that is not too soft, making it easy to work with and allowing an appropriate amount to be applied to the required location.

[0032] In step S14, the filled adhesive 44 is uniformly irradiated with ultraviolet light to harden the adhesive 44. In other words, in the hardening process, the adhesive 44 is hardened while it is present in the grooves 35. That is, the adhesive 44 is present in the slit portions 25 and the grooves 35 as well. 5, the outer end 82 of the hairspring 8 is inserted into the slit portion 25 and is fixed to the hairspring receiver 18 by the adhesive 44. The adhesive 44 fills the inside 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 acts as an engagement portion, and the adhesive 44 can be prevented from falling off the slit portion 25. In other words, the adhesive 44 in the groove 35 acts as a return, exerting an anchor effect and preventing the adhesive 44 from falling off the slit portion 25.

[0033] The adhesive 44 is not limited to an ultraviolet-curing adhesive, but may be any adhesive that can maintain a strong bond after curing, such as an epoxy adhesive, a hot melt adhesive, or a metal brazing material such as solder.

[0034] As described above, according to the stud 15, the stud hairspring 85, the balance wheel 400, the timepiece 100, and the method for manufacturing the stud hairspring 85 of this embodiment, the following effects can be obtained. The hairspring holder 15 includes a cylindrical support portion 17 and a hairspring receiving portion 18 provided on the support portion 17 and having a slit portion 25 for inserting and fixing the hairspring 8. The hairspring receiving portion 18 is shaped like a truncated cone centered on a center line 62 passing through the center of the cylinder. A groove 35 is provided between the support portion 17 and the hairspring receiving portion 18, forming a constriction on the outer periphery. The slit portion 25 is a cutout portion formed from the top surface to the bottom surface of the truncated cone-shaped hairspring receiving portion 18, and extends into part of the groove 35.

[0035] According to this, the groove 35 that functions as an engagement portion for preventing the adhesive 44 from falling off is formed along the outer periphery of the cylindrical stud 15, and can be formed by processing the stud 15 in the circumferential direction. Therefore, unlike the conventional studs that required a separate process such as drilling holes in the side walls of the slit portion, the number of processing steps is small and manufacturing efficiency is good. In particular, since the stud 15 is a small part with a height of about several mm, it is not easy to change the setup by changing the machine tool, and manufacturing efficiency is good if the same machine tool can process the groove 35. Furthermore, the adhesive 44 in the annular groove 35 acts as a return, exhibiting an anchor effect and preventing the adhesive 44 from falling off the slit portion 25. Therefore, it is possible to provide a support 15 that is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0036] In addition, groove 35 includes a first surface 35a that is parallel to center line 62 and forms the bottom of groove 35, a second surface 35b that intersects with first surface 35a and is located on the whisker receiving portion 18 side, and a third surface 35c that intersects with first surface 35a and is located on the support portion 17 side, and third surface 35c is parallel to upper surface 36 of support portion 17 or is inclined below center line 62. According to this, the adhesive 44 filled in the groove 35 penetrates further into the groove 35, so that the effect of preventing the adhesive 44 from falling off can be improved.

[0037] In addition, the bottom surface 27 of the slit portion 25 is located above the third surface 35c of the groove 35. According to this, the adhesive 44 filled in the slit portion 25 and the adhesive 44 filled in the groove 35 join together inside the groove 35, so that the adhesive 44 can be integrated.

[0038] Moreover, the groove 35 goes all the way around the outer periphery of the cylinder of the stud 15 . According to this, the adhesive 44 filled in the groove 35 also has a circular shape, which provides a strong structure as an engagement portion and makes it possible to prevent the adhesive 44 from falling off.

[0039] In addition, a stud-attached hairspring 85 is formed in which the outer end 82 of the hairspring 8 is joined to the stud 15 with adhesive 44. The stud 15 is provided with a slit portion 25 for inserting and fixing the outer end 82 of the hairspring 8, and a groove 35 formed on the outer periphery. The slit portion 25 extends into a part of the groove 35, and the adhesive 44 is present including the slit portion 25 and the groove 35. This makes it possible to provide a stud-type hairspring 85 that is excellent in manufacturing efficiency and has a stud 15 that can prevent the adhesive 44 from falling off.

[0040] The balance 400 also has a hairspring with a stud 85, a balance arbour 410 rotatably supported by a receiver member, a balance wheel 420 fixed to the balance arbour 410, and a collet 56 fixed to the balance arbour 410. This makes it possible to provide a balance 400 that is excellent in manufacturing efficiency and is equipped with a stud 15 that can prevent the adhesive 44 from falling off.

[0041] The timepiece 100 also includes a balance 400 and a movement 10 having the balance 400. This makes it possible to provide a watch 100 that is highly efficient to manufacture and has a stud 15 that can prevent the adhesive 44 from falling off.

[0042] The manufacturing method of the stud-attached hairspring 85 includes the steps of preparing a stud 15 having a slit portion 25 for inserting and fixing the outer end portion 82 of the hairspring 8 and a groove 35 formed on the outer periphery, filling the inside of the slit portion 25 with adhesive 44 while the outer end portion 82 of the hairspring 8 is inserted into the slit portion 25, and hardening the adhesive 44. In the step of filling the adhesive 44, the adhesive 44 is filled so that it also enters the groove 35, and in the hardening step, the adhesive 44 is hardened while remaining in the groove 35. This allows efficient manufacture of the studs 15 that are excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0043] The stud 15 has a slit portion 25 for inserting and fixing the hairspring 8, and has a groove 35 forming a constriction on the outer periphery at a position overlapping with the bottom surface 27 of the slit portion 25.

[0044] According to this, the groove 35 that functions as an engagement part to prevent the adhesive 44 from falling off is formed along the outer periphery of the cylindrical stud 15, so it can be formed by processing the stud 15 in the circumferential direction. Therefore, unlike the conventional studs that required a separate process such as drilling holes in the side walls of the slit part, the number of processing steps is small and manufacturing efficiency is good. Furthermore, the adhesive 44 in the ring-shaped groove 35 acts as a return, exerting an anchor effect and preventing the adhesive 44 from falling off from the slit part 25. Therefore, it is possible to provide a support 15 that is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0045] EMBODIMENT 2 ***Different forms of beards*** Fig. 11 is a side view of the styli according to the second embodiment, which corresponds to Fig. 7. Fig. 12 is a perspective view of a styli in a different aspect, which corresponds to Fig. 7. In the above embodiment, the hair receiving portion 18 of the hair holder 15 is described as having one groove 35 formed therein, but this is not limited thereto, and the hair receiving portion 18 may have a plurality of grooves, or may be a spiral groove. In the following, the same parts as those in the above embodiment are given the same numbers, and duplicated descriptions will be omitted.

[0046] As shown in FIG. 11, the stubble support 45 of this embodiment has two grooves 38a, 38b on the outer periphery of the stubble receiving portion 18. As shown in FIG. The groove 38a is a first groove, and is the same as the groove 35 in the first embodiment. Groove 38b is a second groove and is provided above groove 38a. Groove 38b is divided into a side wall 19a side and a side wall 19b side by slit portion 25. In other words, there are two grooves: groove 38a as a first groove including bottom surface 27 of slit portion 25, and groove 38b as a second groove located above groove 38a and divided by slit portion 25.

[0047] In the bonding process, adhesive 44 is applied to the stud 45 so as to fill the inside of the slit portion 25 and the grooves 38a and 38b. According to this, there are two grooves, groove 38a and groove 38b, which function as locking portions for preventing adhesive 44 from falling off, so that stronger adhesion can be achieved.

[0048] As shown in Fig. 12, the stubble support 46 of this embodiment has a spiral groove 39 on the outer periphery of the stubble receiving portion 18. In a preferred embodiment, the groove 39 goes around the outer periphery of the stubble receiving portion 18 three times, but it is sufficient if the groove 39 goes around the outer periphery of the stubble receiving portion 18 one or more times. The bottom surface 27 of the slit portion 25 fits into the bottommost groove of the groove 39. In other words, the groove 39 goes around the outer periphery of the cylindrical stubble receiving portion 18 in a spiral shape at least once.

[0049] In the bonding process, adhesive 44 is applied to the stud 46 so as to fill the inside of the slit portion 25 and the spiral groove 39. According to this, the groove that functions as an engagement portion for preventing the adhesive 44 from falling off becomes the three-turn spiral groove 39, so that stronger adhesion can be achieved.

[0050] As described above, according to the stabilisers 45 and 46 of this embodiment, in addition to the effects of the above embodiment, the following effects can be obtained. The grooves of the support 45 are a groove 38a serving as a first groove including the bottom surface 27 of the slit portion 25, and a groove 38b serving as a second groove located above the groove 38a and divided by the slit portion 25.

[0051] According to this, the two grooves 38a, 38b are formed along the outer periphery of the cylindrical support 45, and can be formed by processing the support 45 in the circumferential direction, so that the number of processing steps is small and manufacturing efficiency is good. Furthermore, it is possible to prevent the adhesive 44 from falling off. Therefore, it is possible to provide the support 45 which is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0052] Further, the groove 39 of the stubble support 46 extends in a spiral manner at least once around the outer periphery of the cylindrical stubble receiving portion 18 .

[0053] According to this, the spiral groove 39 is formed along the outer periphery of the cylindrical stud 46, and can be formed by processing the stud 46 in the circumferential direction, so that the number of processing steps is small and manufacturing efficiency is good. Furthermore, it is possible to prevent the adhesive 44 from falling off. Therefore, it is possible to provide a support 46 that is excellent in manufacturing efficiency and can prevent the adhesive 44 from falling off.

[0054] EMBODIMENT 3 ***Different aspects of adhesive*** FIG. 13 is a perspective view of a hairspring with a stud according to the third embodiment, and corresponds to FIG. In the above embodiment, the adhesive 44 before hardening is described as being liquid, but this is not limited thereto, and a solid adhesive material may be used. Hereinafter, the same parts as those in the above embodiment are denoted by the same numbers, and duplicated descriptions will be omitted.

[0055] As shown in FIG. 13, this embodiment differs from the first embodiment in that an adhesive member 48 that is solid in its initial state before hardening is used as the adhesive. The adhesive member 48 is cylindrical and has a shape that fits inside the slit portion 25 of the stud 15. The diameter of the adhesive member 48 is slightly smaller than the hole 28 at the top of the stud 15, and a notch 49 corresponding to the outer end portion 82 of the hairspring 8 is provided on the underside. The adhesive member 48 is a thermoplastic adhesive pellet whose main component is a material such as a natural resin such as an insect covering, or a synthetic resin made of phenol resin, polyamide resin, ethylene vinyl acetate, or the like.

[0056] In the adhesive filling step, the adhesive member 48 is set in the slit portion 25, and in the curing step, the adhesive member 48 is heated and melted. When the adhesive member 48 melts, the inside of the slit portion 25 and the entire circumference of the groove 35 are filled with the molten adhesive member. It is then cooled for a predetermined period of time and hardened. This allows for adhesive fixation in the same state as the adhesive 44 in FIG. 5. The notch portion 49 of the adhesive member 48 may be omitted. The adhesive member 48 is a flexible resin pellet, so even without the notch portion 49, it will deform and fit inside the slit portion 25 when pushed in. In other words, the adhesive is a solid adhesive member 48, and in the adhesive filling step, the adhesive member 48 is set in the slit portion 25, and in the curing step, the adhesive member 48 is heated and melted, and then cooled and cured.

[0057] As described above, according to the support 15 and adhesive member 48 of this embodiment, in addition to the effects of the above embodiment, the following effects can be obtained. The adhesive is a solid adhesive member 48. In the adhesive filling step, the adhesive member 48 is set in the slit portion 25, and in the curing step, the adhesive member 48 is heated and melted, and then cooled and cured.

[0058] According to this, since it is only necessary to set the adhesive member 48 in the slit portion 25, this is simpler and more efficient than filling with a liquid adhesive. Furthermore, it is possible to prevent the adhesive from falling off. Therefore, it is possible to provide a method for manufacturing the stud hairspring 85 that is excellent in manufacturing efficiency and can prevent the adhesive from falling off. [Explanation of symbols]

[0059] 2...Outer case, 3...Dial, 3A...Calendar window, 4A...Hour hand, 4B...Minute hand, 4C...Second hand, 5...Power reserve hand, 6...Date indicator, 7...Crown, 8...Balance spring, 10...Movement, 11...Main plate, 12...First bridge, 13...Balance bridge, 13b...Reference surface, 15...Balance holder, 16...Base, 17...Support, 18...Balance holder, 19a...Side wall, 19b...Side wall, 21...First wheel, 23...Third wheel, 24...Fourth wheel, 25...Slit, 26a...Side, 26b...Side, 27...Bottom, 28...Hole, 29...Escape wheel, 30...Hand-winding mechanism, 31...Winding stem, 32...Drum wheel, 33...Lower wheel, 35...Groove, 35a...first surface, 35b...second surface, 35c...third surface, 36...upper surface, 38a...groove, 38b...groove, 39...groove, 40...crowned wheel, 41...first crown wheel, 42...second crown wheel, 44...adhesive, 45...balance pin, 46...balance pin, 48...adhesive member, 49...notch, 51...first intermediate wheel, 52...second intermediate wheel, 53...pallet fork, 55...governor, 56...collar, 60...rattle wheel, 62...center line, 81...inner end, 82...outer end, 85...balance spring with stud, 100...clock, 400...balance, 410...balance axle, 420...balance wheel, 430...oscillating seat, 460...regulation pin, 461...balance pin, 462...degree stop portion.

Claims

1. A cylindrical support portion; a hairspring receiving portion provided on the support portion and having a slit portion for receiving and fixing the hairspring, The bristles receiving portion is shaped like a truncated cone centered on a center line passing through the center of the cylinder, A groove is provided between the support portion and the bristles receiving portion to form a constriction on the outer periphery, The slit portion is a cutout portion formed from the top surface of the truncated cone-shaped bristles receiving portion toward the bottom surface, and extends into a part of the groove. He has a beard.

2. The groove has a first surface that is parallel to the center line and forms a bottom of the groove; A second surface intersecting the first surface and positioned on the side of the bristles receiving portion; a third surface that intersects with the first surface and is located on the support portion side, The third surface is parallel to an upper surface of the support portion or inclined downwardly to the center line. The hair retainer according to claim 1 .

3. A bottom surface of the slit portion is located above the third surface of the groove. The hair retainer according to claim 2.

4. The groove extends around the circumference of the cylinder. The hair retainer according to claim 1 .

5. The groove includes a first groove including a bottom surface of the slit portion; a second groove located above the first groove and divided by the slit portion; The hair retainer according to claim 3.

6. The groove extends in a spiral manner at least once around the outer periphery of the cylinder. The hair retainer according to claim 1 .

7. A hairspring with a stud, the end of which is bonded to the stud by adhesive, The stud has a slit portion for receiving and fixing an end of the hairspring, and a groove formed on an outer periphery thereof, The slit portion extends into a part of the groove, The adhesive is present in the slit portion and the groove. Balance spring with stud.

8. A hairspring with a stud according to claim 7, A balance shaft rotatably supported by a receiving member; A balance wheel fixed to the balance shaft; and a hairpin fixed to the balance shaft. Temp.

9. The balance according to claim 8; A movement having the balance. clock.

10. preparing a stud having a slit portion for receiving and fixing an end of the hairspring and a groove formed on an outer periphery; filling the inside of the slit with adhesive while the end of the hairspring is inserted in the slit; and a curing step of curing the adhesive. In the step of filling the adhesive, the adhesive is filled so as to penetrate into the groove, In the curing step, the adhesive is cured while being present in the groove. A method for manufacturing a hairspring with a stud.

11. The viscosity of the adhesive is 400 mPa·s or more and 600 mPa·s or less. A method for manufacturing the stud hairspring according to claim 10.

12. The adhesive is a solid adhesive member, In the adhesive filling step, the adhesive member is set in the slit portion, In the curing step, the adhesive member is heated and melted, and then cooled and cured. A method for manufacturing the stud hairspring according to claim 10.

13. A stud having a slit for inserting and fixing the hairspring, A groove is provided on the outer periphery at a position overlapping with the bottom surface of the slit portion to form a constriction. He has a beard.

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