Balance wheel, clock, and method for manufacturing a balance wheel

Abstract

To provide a balance with a hairspring that can maintain high accuracy, a watch, and a method for manufacturing a balance with a hairspring.SOLUTION: A balance with a hairspring comprises: a balance staff 410 that is rotatably supported on a bottom board; a collet 440 that is fixed to the balance staff 410; a balance spring 70 that is fixed to the collet 440, and has the Grossmann curve arranged on the side of the collet 440 and the Archimedes curve connected with the Grossmann curve; and a shock resistant member 500 that prevents displacement of the shape of the Grossmann curve at least on the side of the collet 440.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a template, a clock, and a method for manufacturing a template.

Background Art

[0002] Patent Documents 1 and 2 disclose a silicon-based hairspring in which the inner curved portion has a Grossmann shape and the outer curved portion has an Archimedes shape for regulating the speed of a template. The end of the inner curved portion of the hairspring is fixed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technologies described in Patent Documents 1 and 2, when an impact is applied to the clock, there is a problem that the Grossmann-shaped inner curved portion with a fixed end is deformed or damaged, which deteriorates the accuracy of regulating the speed of the template. On the other hand, even when the Grossmann-shaped inner curved portion is formed of a metal material, there is a problem that it affects the accuracy of regulating the speed of the template, that is, the accuracy of the clock, such as being deformed by an impact.

Means for Solving the Problems

[0005] The balance wheel comprises a balance staff rotatably supported by a support member, a hairspring fixed to the balance staff, a hairspring fixed to the hairspring and having a Grossman curve positioned on the hairspring side, and an Archimedes curve connected to the Grossman curve, and an impact-resistant member that suppresses displacement of at least the shape of the Grossman curve on the hairspring side.

[0006] The watch is equipped with the balance wheel described above.

[0007] A method for manufacturing a balance wheel comprises a balance staff rotatably supported by a support member and a hairspring fixed to the balance staff, and includes the steps of: preparing a hairspring that follows an Archimedes curve; fixing the inner end of the hairspring to the hairspring; shaping the inner end section of the hairspring using a shaping member so that it follows a Grossman curve; and removing the shaping member from the hairspring.

[0008] A method for manufacturing a balance wheel comprises a balance staff rotatably supported by a support member and a hairspring fixed to the balance staff, and includes the steps of: preparing a hairspring that follows an Archimedes curve; fixing the inner end of the hairspring to the hairspring; attaching an impact-resistant member to the hairspring; and using the impact-resistant member to shape the inner end section of the hairspring so that it follows a Grossman curve.

[0009] A method for manufacturing a balance wheel comprises a balance staff rotatably supported by a support member and a hairspring fixed to the balance staff, and includes the steps of: preparing a hairspring that follows an Archimedes curve; fixing the inner end of the hairspring to the hairspring; and shaping the inner end section of the hairspring using the hairspring so that it follows a Grossman curve. [Brief explanation of the drawing]

[0010] [Figure 1] A plan view showing the configuration of a clock. [Figure 2]Plan view showing the movement structure. [Figure 3] Plan view showing the template structure. [Figure 4] Cross-sectional view showing the template structure. [Figure 5] Plan view showing an enlarged part of the template structure. [Figure 6] Cross-sectional view showing the structure of the whisker ball and the shock-resistant member. [Figure 7] Perspective view showing the structure of the whisker ball, the whisker spring, and the shock-resistant member. [Figure 8] Perspective view showing the manufacturing method of the template. [Figure 9] Perspective view showing the manufacturing method of the template. [Figure 10] Perspective view showing the manufacturing method of the template. [Figure 11] Perspective view showing the manufacturing method of the template. [Figure 12] Plan view showing the structure of the template of the modification. [Figure 13] Cross-sectional view showing the structure of the template of the modification. [Figure 14] Plan view showing the structure of the template of the modification. [Figure 15] Cross-sectional view showing the structure of the template of the modification.

Embodiments for Carrying Out the Invention

[0011] First, the structure of the clock 1 will be described while referring to FIG. 1.

[0012] As shown in FIG. 1, the clock 1 is a mechanical wristwatch worn on the user's wrist and includes a cylindrical outer case 2. A dial 3 is disposed on the inner peripheral side of the outer case 2. Of the two openings of the outer case 2, the opening on the front side is closed with a cover glass, and the opening on the back side is closed with a back cover.

[0013] The timepiece 1 includes, for example, a movement 10 (see FIG. 2) housed in an outer case 2, hour hand 4A, minute hand 4B, second hand 4C for displaying time information, and a power reserve hand 5 for indicating the duration by a spring (not shown).

[0014] The hour hand 4A, minute hand 4B, second hand 4C, and power reserve hand 5 are attached to the pointer shaft of the movement 10 and driven by the movement 10. A calendar window 3A is provided on the dial 3, and the date wheel 6 is visible through the calendar window 3A. A dragon head 7 is provided on the side surface of the outer case 2.

[0015] Next, the configuration of the movement 10 will be described while referring to FIG. 2.

[0016] As shown in FIG. 2, the movement 10 includes a base plate 11, a first wheel carrier 12, and a mainspring support 13. Between the base plate 11 and the first wheel carrier 12, there are arranged a barrel arbor 21 storing a mainspring, a second wheel (not shown), a third wheel 23, a fourth wheel 24, and an escape wheel 25. Also, between the base plate 11 and the mainspring support 13, there are arranged an anchor 26, a speed regulator 27, etc. And in this embodiment, the speed regulator 27 includes a template 400.

[0017] The winding mechanism 30 includes a winding drum 31, a ratchet wheel 32, a click wheel 33, a round hole wheel 40, a first intermediate wheel 51, and a second intermediate wheel 52, which are rotatably supported by the first wheel carrier 12. The rotation by the rotation operation of the dragon head 7 is transmitted to a square hole wheel 60, and the square hole wheel 60 and the barrel drum are rotated to wind up the mainspring. The round hole wheel 40 is composed of a first round hole wheel 41 meshing with the click wheel 33 and a second round hole wheel 42 rotating integrally with the first round hole wheel 41 and meshing with the first intermediate wheel 51.

[0018] Next, the configuration of the template 400 will be described while referring to FIGS. 3 to 5.

[0019] As shown in Figures 3 and 4, the balance wheel 400 is composed of a balance staff 410, a balance wheel 420, a hairspring 440, and a hairspring 70.

[0020] The balance staff 410 is rotatably supported by the base plate 11 and the balance wheel support 13 (see Figure 2). Note that the base plate 11 and the balance wheel support 13 are examples of support members.

[0021] The balance staff 410 has the balance wheel 420, the hairspring ball 440, etc., fixed to it, and these are configured to rotate as a single unit. The hairspring 70 has its inner end 71 (see Figure 5) fixed to the hairspring ball 440, and its outer end 74 fixed to a hairspring holder (not shown). The hairspring holder is fixed to the balance bridge 13.

[0022] In the balance wheel 400, when the balance wheel 420 rotates around the balance staff 410, the hairspring 440 also rotates. The balance wheel 420 is subjected to the biasing force of the hairspring 70. When this biasing force and the inertial force of the balance wheel 420 balance each other, the rotation of the balance wheel 420 stops, and the biasing force of the hairspring 70 causes the balance wheel 420 to rotate in the opposite direction. In other words, the balance wheel 420 repeatedly oscillates around the balance staff 410.

[0023] As shown in Figure 5, the hairspring 70 is made of a metal, plate-shaped elastic material, specifically an elastic material made of a plate-shaped material such as a coelin bar, which is an alloy containing Cr, Ni, Co, etc. The hairspring 70 may also be made of silicon material. The hairspring 70 comprises an inner end 71, a first winding portion 72, a second winding portion 73, and an outer end 74.

[0024] The inner end portion 71 is the part that is inserted into and fixed to the fixing portion 442 of the whisker ball 440. The first winding portion 72 is formed continuously from the inner end portion 71. The first winding portion 72 is formed along the Grossman curve in a plan view taken from the axial direction of the balance staff 410.

[0025] Specifically, the first winding section 72 is formed such that, in Figure 5, its centroid lies at a virtual point P on a virtual line segment M that is perpendicular to the virtual line segment N connecting the connection point E of the first winding section 72 and the second winding section 73 with the center point C of the balance staff 410, and the length Q from the center point C of the balance staff 410 satisfies the following equation (1).

[0026] Q=R 2 / L...Formula (1)

[0027] In equation (1) above, R is the length of the imaginary line segment N from the center point C of the balance staff 410 to the connection point E of the first winding section 72 and the second winding section 73. L is the length of the arc from the connection point S of the inner end section 71 and the first winding section 72 to the connection point E of the first winding section 72 and the second winding section 73, that is, the length of the first winding section 72.

[0028] The second winding section 73 is formed continuously from the first winding section 72. The second winding section 73 is formed along an Archimedes curve when viewed in a plan view from the axial direction of the truing post 410. In this embodiment, a bent section 722 (see Figure 3) is formed in the middle of the outermost circumference of the second winding section 73.

[0029] The outer end portion 74 (see Figure 3) is formed continuously from the second winding portion 73 and is fixed to a hairspring holder (not shown). That is, the hairspring 70 has its inner end portion 71 fixed to the hairspring ball 440 and its outer end portion 74 fixed to a hairspring holder (not shown).

[0030] Next, the configurations of the hairspring 440, the hairspring 70, and the shock-resistant member 500 will be described with reference to Figures 6 and 7.

[0031] As shown in Figures 6 and 7, the whisker ball 440 is fixed to the balance staff 410. Above the whisker ball 440, the impact-resistant member 500 is fixed to the balance staff 410.

[0032] The whisker ball 440 comprises, for example, a whisker ball body portion 441, a fixing portion 442, and a balance staff insertion hole 444.

[0033] The main body portion 441 of the whisker ball is provided in a roughly cylindrical shape with a roughly circular outer shape 443 (see Figure 5).

[0034] The main body portion 441 of the balance staff has a divided portion 441a (see Figure 7) formed therein. This allows the torque to be adjusted to an appropriate value by expanding the divided portion 441a if the torque is too strong when the balance staff 440 is fixed to the balance staff 410 when the balance staff 410 is inserted into the balance staff insertion hole 444.

[0035] The fixing portion 442 has a groove and is the part that fixes the inner end portion 71 of the hairspring 70. The fixing portion 442 fixes the hairspring 70 by sandwiching the inner end portion 71 in the groove.

[0036] The balance staff insertion hole 444 is an insertion hole into which the balance staff 410 is inserted.

[0037] As described above, an impact-resistant member 500 is positioned above the hairspring 440. The impact-resistant member 500 is used to suppress the displacement of the Grossman curve, which is the first winding portion 72 of the hairspring 70. The impact-resistant member 500 is made of a roughly cylindrical metal material.

[0038] The impact-resistant member 500 supports the hairspring 70 in maintaining its Grossman curve, at least in the first region 521 on the inner end 71 side and in the vicinity of the second region 522, which is the boundary between the first winding portion 72 and the second winding portion 73.

[0039] As shown in Figure 7, the first region 521 is near the fixing part 442 that secures the hairspring 70 to the hairspring ball 440. The second region 522 is, for example, a range from about 180° to about 360°, assuming that the point where the curve changes from a Grossman curve to an Archimedes curve is about 270° from the fixing part 442. It is preferable that the shock-resistant member 500 supports the range from the first region 521 to the second region 522, and the shape of each part is set to achieve both the prevention of deformation of the hairspring 70 and the balance of the center of gravity of the shock-resistant member 500.

[0040] In other words, the area in which the displacement of the hairspring 70 is suppressed by the shock-absorbing member 500 is smaller in distance between the shock-absorbing member 500 and the hairspring 70 than in other areas. Specifically, the areas of the shock-absorbing member 500 other than the first area 521 and the second area 522 may have a deformed outer shape rather than a circular shape. For example, the outer shape may be concave or notched. Also, if the outer shape is circular, there may be a hollow area.

[0041] Specifically, for example, the gap from the connection point S between the inner end portion 71 and the first winding portion 72 to the arc length L = 750 μm to 1000 μm is set to 50 μm or less. By setting the gap in this way, it is possible to suppress the inward deformation of the base of the hairspring 70. On the side opposite the connection point S, the gap is set to 200 μm to 250 μm or less. By setting the gap in this way, it is possible to suppress the outward deformation of the base of the hairspring 70.

[0042] Furthermore, in the region between the first region 521 and the second region 522, a notch is provided so that the center of gravity of the impact-resistant member 500 coincides with the center of the balance staff, while setting a gap between the impact-resistant member 500 and the balance spring 70 to suppress deformation of the base of the balance spring 70. This makes it possible to suppress deformation of the Grossman curve when an impact is applied to the balance spring 70 from any direction. It also makes it possible to suppress the occurrence of uneven weight distribution due to the impact-resistant member 500.

[0043] Furthermore, the height of the impact-resistant member 500 is set to be at least equal to or greater than the height of the hairspring 70. As a result, the displacement of the hairspring 70 is suppressed by the impact-resistant member 500, which is equal to or greater than the height of the hairspring 70, so that deformation of the Grossman curve can be suppressed when the hairspring 70 is subjected to an impact.

[0044] Next, the manufacturing method of Temp 400 will be explained with reference to Figures 8 to 11.

[0045] In the process shown in Figure 8, the hairspring 70 (see Figure 9) and the hairspring ball 440 are prepared. Specifically, the hairspring material, which is made of a metal, plate-shaped elastic material, is formed along the Archimedes curve.

[0046] In the process shown in Figure 9, the shaping member 600 is used to shape the hairspring 70 so that the section from connection point S to connection point E becomes a Grossman curve. Specifically, first, the inner end portion 71 of the hairspring 70 is fixed to the fixing portion 442 of the hairspring ball 440. Then, the inner end portion of the hairspring 70 is shaped along the outer peripheral shape portion 601 of the shaping member 600 so that it becomes a Grossman curve.

[0047] In the process shown in Figure 10, the shaping member 600 is removed from the hairspring ball 440. This forms a hairspring 70 having a first winding portion 72 formed along the Grossman curve and a second winding portion 73 formed along the Archimedes curve.

[0048] In the process shown in Figure 11, the balance wheel 400 is completed by fixing the balance ball 440 to which the hairspring 70 is fixed, and the balance wheel 420 to the balance staff 410, and then fixing the shock-resistant member 500, which suppresses the displacement of the first winding portion 72 of the hairspring 70, to the balance staff on top of the hairspring ball 440. This makes it possible to suppress deformation of the Grossman curve fixed to the hairspring ball 440, which is particularly susceptible to shock, when the hairspring 70 is subjected to an impact.

[0049] As described above, the balance wheel 400 of this embodiment comprises a balance staff 410 rotatably supported by the base plate 11 and the balance bridge 13, a hairspring 440 fixed to the balance staff 410, a hairspring 70 fixed to the hairspring 440 and having a Grossman curve positioned on the hairspring 440 side and an Archimedes curve connected to the Grossman curve, and an impact-resistant member 500 that suppresses displacement of at least the shape of the Grossman curve on the hairspring 440 side.

[0050] With this configuration, the shock-resistant member 500 suppresses the displacement of at least the shape of the Grossman curve on the hairspring 440 side. For example, if the hairspring 70 is subjected to an impact, deformation of the Grossman curve fixed to the hairspring 440, which is particularly susceptible to impact, can be suppressed. This suppresses the impact on the accuracy of the balance wheel 400's regulating function, or in other words, on the accuracy of the clock 1.

[0051] Furthermore, in the balance wheel 400 of this embodiment, it is preferable that the center of gravity of the hairspring and the shock-resistant member combined coincides approximately with the center of the balance staff. With this configuration, since the center of gravity coincides with the center of the balance staff, it is possible to suppress the shift in the center of gravity that causes uneven weight distribution.

[0052] Furthermore, in the balance wheel 400 of this embodiment, it is preferable that the distance between the shock-resistant member 500 and the hairspring 70 is set smaller in the first region 521 where the hairspring 70 is fixed to the hairspring ball 440 and near the second region 522 where the curve changes from a Grossman curve to an Archimedes curve than the distance between the first region 521 and the second region 522. With this configuration, the distance between the shock-resistant member 500 and the hairspring 70 is small in at least the first region 521 and the second region 522, making it possible to suppress the displacement of the hairspring 70, and thus it is possible to suppress deformation of the Grossman curve when the hairspring 70 is subjected to an impact.

[0053] Furthermore, in the balance wheel 400 of this embodiment, it is preferable that the shock-resistant member 500 has a notched shape or a concave shape between the first region 521 and the second region 522. With this configuration, it is possible to suppress deformation of the Grossman curve when the hairspring 70 is subjected to an impact, while also suppressing the occurrence of uneven weighting due to the shock-resistant member 500.

[0054] Furthermore, in the balance wheel 400 of this embodiment, it is preferable that the height of the shock-resistant member 500 is at least equal to or greater than the height of the hairspring 70. With this configuration, the displacement of the hairspring 70 is suppressed by the shock-resistant member 500, which is equal to or greater than the height of the hairspring 70, so that deformation of the Grossman curve can be suppressed when the hairspring 70 is subjected to an impact.

[0055] Furthermore, the clock 1 of this embodiment is equipped with the balance wheel 400 described above. With this configuration, because the balance wheel 400 is provided, deformation of the hairspring 70 can be suppressed even if the clock 1 is subjected to an impact. This makes it possible to provide a clock 1 that can suppress the impact on the accuracy of the time.

[0056] Furthermore, the manufacturing method of the balance wheel 400 in this embodiment includes the steps of: preparing a hairspring 70 that follows the Archimedes curve; fixing the inner end portion 71 of the hairspring 70 to the hairspring ball 440; and shaping the inner end portion of the hairspring 70 to conform to a Grossman curve using a shaping member 600. By this method, the hairspring 70 is shaped to conform to a Grossman curve, thereby improving the accuracy of the balance wheel 400's regulating function.

[0057] Furthermore, in the manufacturing method of the balance wheel 400 of this embodiment, it is preferable to have a step of attaching an impact-resistant member 500, which suppresses displacement of the Grossman curve, to the balance staff 410. According to this method, since the impact-resistant member 500 is attached after the shape-setting member 600 is removed, for example, if the hairspring 70 is subjected to an impact, deformation of the Grossman curve of the hairspring 70, which is particularly susceptible to impact and is fixed to the hairspring ball 440, can be suppressed. This makes it possible to suppress the impact on the accuracy of the balance wheel 400's regulating.

[0058] The following describes some variations of the embodiments described above.

[0059] As described above, the method is not limited to removing the shape-setting member 600 from the whisker ball 440 and then attaching the impact-resistant member 500; the following method may also be used.

[0060] As shown in Figures 12 and 13, in the modified example 1, the balance wheel 400a may be configured such that the shock-resistant member 500 also functions as a shaping member 600. As a method for manufacturing the balance wheel 400a of the modified example 1, first, the inner end portion 71 of the hairspring 70, which is formed into an Archimedes curve, is fixed to the side surface of one of the two fitting portions 801 and 802 provided on the hairspring ball 440, for example, by laser welding. Next, the shock-resistant member 500, which has the function of the shaping member 600 described above, is attached to the hairspring ball 440. At this time, the fitting portions 801 and 802 are used to position and fix the hairspring ball 440. The hairspring 70 is shaped using the shock-resistant member 500 to form a Grossman curve. After that, the hairspring ball 440 and the shock-resistant member 500 are attached to the balance staff 410.

[0061] Thus, the manufacturing method for the balance wheel 400a of the modified example 1 includes the steps of: preparing a hairspring 70 that follows an Archimedes curve; fixing the inner end portion 71 of the hairspring 70 to the hairspring ball 440; attaching the shock-resistant member 500 to the hairspring ball 440; and shaping the inner end portion of the hairspring 70 to conform to a Grossman curve using the shock-resistant member 500.

[0062] This method allows the hairspring 70 to be shaped using the shock-resistant member 500. As a result, if the hairspring 70 is subjected to an impact, such as from a fall, during use after manufacturing, the shock-resistant member 500, which also functions as part of the balance wheel while shaping the hairspring, can prevent deformation of the Grossman curve. This minimizes the impact on the accuracy of the balance wheel 400a's regulating function.

[0063] In the modified example 2, the Temp 400b has an integrated structure with the shock-resistant member 500 and the hairspring 440. In other words, the hairspring 440 has the function of both the shock-resistant member 500 and the shape-setting member 600.

[0064] As shown in Figures 14 and 15, the manufacturing method for the modified example 2 of the balance wheel 400b involves first preparing a balance wheel 440 which integrates the function of the shape-setting member 500 described above with the function of a balance wheel 440. The balance wheel 440 consists of two layers: a lower layer which functions as a center of gravity adjustment member and an upper layer which functions as both the impact-setting member 500 and the shape-setting member 600. Next, the inner end portion 71 of the hairspring 70, which is formed into an Archimedes curve, is fixed to the fixing portion 442 of the upper layer of the balance wheel 440, for example, by laser welding. Then, the hairspring 70 is shaped using the balance wheel 440 to form a Grossman curve. After that, the balance wheel 440 is attached to the balance staff.

[0065] Thus, in the modified example 2 of the Temp 400b, it is preferable that the shock-resistant member 500 is integrally structured with the hairspring 440. With this configuration, since the shock-resistant member 500 and the hairspring 440 are integrally structured, an increase in the number of parts can be prevented.

[0066] Furthermore, the manufacturing method for the balance wheel 400b of the modified example 2 includes the steps of: preparing a hairspring 70 that follows an Archimedes curve; fixing the inner end portion 71 of the hairspring 70 to the hairspring ball 440; and shaping the inner end portion of the hairspring 70 using the hairspring ball 440 so that it follows a Grossman curve.

[0067] This method allows the hairspring 70 to be shaped using the hairspring ball 440. As a result, if the hairspring 70 is subjected to impact during use after manufacturing, such as from a fall, the hairspring ball 440, which also functions as a shaping member and impact-resistant member, can prevent deformation of the Grossman curve and minimize the impact on the regulating accuracy of the balance wheel 400b.

[0068] Furthermore, as described above, the impact-resistant member 500 is not limited to being fixed to the balance staff 410, but may also be fixed to the hairspring 440.

[0069] Furthermore, the impact-resistant member 500 is not limited to being made of a metal material, but may also be made of a resin material. This would further suppress the occurrence of uneven weight distribution in the balance wheel 400, even if there are variations in shape, because the specific gravity is low.

[0070] Furthermore, the hairspring 440 may be equipped with a center of gravity adjustment member for adjusting the combined center of gravity of the hairspring 440 and the shock-resistant member 500 to the center of the balance staff 410. This prevents a decrease in the accuracy of the watch 1 due to uneven weight distribution in the balance wheel 400.

[0071] Thus, the modified balance wheel 400 may be equipped with a center of gravity adjustment member that adjusts the center of gravity of the hairspring 440 and the shock-resistant member 500 together to the center of the balance staff 410.

[0072] Furthermore, in the modified balance wheel 400, the center of gravity adjustment member may be integrated with the hairspring 440. With this configuration, since the center of gravity adjustment member and the hairspring are integrated, an increase in the number of parts can be prevented.

[0073] Furthermore, as described above, the center of gravity adjustment member is not limited to being provided on the hairspring 440, but may also be provided on the impact-resistant member 500. Alternatively, the impact-resistant member 500 may be provided with a center of gravity adjustment member so as to coincide with the center point of the balance staff 410, and the hairspring 440 may also be provided with a center of gravity adjustment member so as to coincide with the center point of the balance staff 410. [Explanation of Symbols]

[0074] 1...Watch, 2...Outer case, 3...Dial, 3A...Calendar window, 4A...Hour hand, 4B...Minute hand, 4C...Second hand, 5...Power reserve hand, 6...Date wheel, 10...Movement, 11...Main plate as a support component, 13...Balance bridge as a support component, 12...First bridge, 21...Main barrel, 23...Third wheel, 24...Fourth wheel, 25...Escape wheel, 26...Anchor lever, 27...Regulator, 30...Manual winding mechanism, 31...Winding stem, 32...Handwheel, 33...Handwheel, 40...Hassle wheel, 41...First hook wheel, 42...Second hook wheel, 5 1...First intermediate wheel, 52...Second intermediate wheel, 60...Square hole wheel, 70...Hairspring, 71...Inner end, 72...First winding section, 73...Second winding section, 74...Outer end, 400...Balance wheel, 410...Balance staff, 420...Balance wheel, 440...Hairspring ball, 441...Hairspring ball body, 441a...Separation section, 442...Fixing section, 444...Balance staff insertion hole, 445...Center of gravity adjustment member, 500...Impact-resistant member, 521...First region, 522...Second region, 600...Shaping member, 601...Outer circumference shape section, 722...Bent section, 801,802...Fitting section.

Claims

1. The balance staff is rotatably supported by the support member, The lead barrel fixed to the balance staff, A hairspring having a Grossman curve fixed to the hairspring and positioned on the hairspring side, and an Archimedes curve connected to the Grossman curve, The system includes, at least, an impact-resistant member that suppresses the displacement of the shape of the Grossman curve on the whisker ball side, A balance wheel in which the combined center of gravity of the aforementioned hairspring and the aforementioned shock-resistant member coincides approximately with the center of the balance staff.

2. A balance staff rotatably supported by a support member, The lead barrel fixed to the balance staff, A hairspring having a Grossman curve fixed to the hairspring and positioned on the hairspring side, and an Archimedes curve connected to the Grossman curve, The system includes, at least, an impact-resistant member that suppresses the displacement of the shape of the Grossman curve on the whisker ball side, A balance wheel comprising a center of gravity adjustment member for adjusting the combined center of gravity of the hairspring and the shock-resistant member to the center of the balance staff.

3. A balance staff rotatably supported by a support member, The lead barrel fixed to the balance staff, A hairspring having a Grossman curve fixed to the hairspring and positioned on the hairspring side, and an Archimedes curve connected to the Grossman curve, The system includes, at least, an impact-resistant member that suppresses the displacement of the shape of the Grossman curve on the whisker ball side, A balance wheel in which, in the first region where the hairspring is fixed to the hairspring ball, and near the second region where the curve changes from the Grossman curve to the Archimedes curve, the distance between the shock-resistant member and the hairspring is set to be smaller than the distance between the first region and the second region.

4. The temper according to claim 3, A temper plate having a notched shape or a concave shape between the first region and the second region of the impact-resistant member.

5. A temp according to any one of claims 1 to 4, The height of the shock-resistant member is at least equal to or greater than the height of the hairspring, in the balance wheel.

6. A temp according to any one of claims 1 to 5, The aforementioned shock-resistant member is a balance wheel, which has an integral structure with the hairspring.

7. The temper according to claim 2, The aforementioned center of gravity adjustment member is integrally structured with the balance wheel.

8. A clock comprising the balance wheel according to any one of claims 1 to 7.

9. A method for manufacturing a balance wheel comprising a balance staff rotatably supported by a support member and a hairspring fixed to the balance staff, The process of preparing a hairspring that follows the Archimedes curve, A step of fixing the inner end of the hairspring to the hairspring ball, The process of attaching a shape-setting member to the aforementioned whisker ball, A step of shaping the inner end section of the hairspring using the shaping member so that it forms a Grossman curve, The process of removing the setting member from the whisker ball, A step of attaching an impact-resistant member to the balance staff to suppress the displacement of the Grossman curve, A method for manufacturing temp, having the following characteristics.

10. A method for manufacturing a balance wheel comprising a balance staff rotatably supported by a support member and a hairspring fixed to the balance staff, The process of preparing a hairspring that follows the Archimedes curve, A step of fixing the inner end of the hairspring to the hairspring ball, A step of attaching an impact-resistant member to the whisker ball that suppresses the displacement of at least the shape of the Grossman curve on the whisker ball side, A method for manufacturing a balance wheel, comprising the step of shaping the inner end section of the hairspring using the shock-resistant member so that it forms a Grossman curve.

11. A method for manufacturing a balance wheel comprising a balance staff rotatably supported by a support member and a hairspring fixed to the balance staff, The aforementioned hairspring is provided with a layer that acts as an impact-resistant member to suppress displacement of at least the shape of the hairspring side of the Grossman curve, The process of preparing a hairspring that follows the Archimedes curve, A step of fixing the inner end of the hairspring to the hairspring ball, A method for manufacturing a balance wheel, comprising the step of shaping the inner end section of the hairspring using the layer of the hairspring ball as the shock-resistant member to form the Grossman curve.

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