JP2020134428A - Temperature compensation type balance, movement, and watch - Google Patents

Abstract

To provide a high-quality temperature compensation type balance, movement and watch with excellent temperature compensation performance, capable of easily adjusting the inertia moment with high accuracy while suppressing a speed change.SOLUTION: A temperature compensation type balance according to an aspect of the present invention comprises a balance ring 62 provided on a balance stem rotatably around a first axis line by power of a hairspring and having a high expansion part 82 and a low expansion part 81 which are different in thermal expansion coefficient. The balance ring 62 includes: a deformation part 80 which is deformable in the radial direction according to a temperature change due to a difference in the thermal expansion coefficient between the high expansion part 82 and the low expansion part 81; and an adjustment part 64 having a weight part 102 which has the center of gravity at a position eccentric to a second axis line O2 along the radial direction and mounted on the deformation part 80 rotatably around the second axis line O2 in a state in which at least the weight part 102 is restricted from moving in a direction along the second axis line O2.SELECTED DRAWING: Figure 5

Description

The present invention relates to temperature compensated balances, movements and watches.

The balance wheel, which functions as the governor of a mechanical timepiece, is equipped with a balance wheel that extends along the axis, a balance wheel that is fixed to the balance wheel, and a balance spring. The balance spring and the balance wheel periodically rotate forward and reverse (vibrate) around the axis as the balance spring expands and contracts.

In the above-mentioned balance sheet, it is important that the vibration period is set within a predetermined value. If the vibration cycle deviates from the specified value, the rate of the mechanical timepiece (the degree of delay and advance of the timepiece) changes.

The vibration period T of the balance is expressed by the following equation (1). In equation (1), I represents the "moment of inertia" of the balance wheel and K represents the "spring constant" of the balance spring.

Based on the equation (1), when the moment of inertia I of the balance wheel and the spring constant K of the balance spring change due to a temperature change or the like, the vibration period T of the balance wheel changes. Specifically, the balance wheel described above may be formed of a material having a positive coefficient of thermal expansion (a material that expands with an increase in temperature). In this case, as the temperature rises, the diameter of the balance wheel expands and the moment of inertia I increases.
Therefore, as the temperature rises, the moment of inertia I increases, so that the vibration period T becomes longer. As a result, the vibration period T of the balance is short at a low temperature and long at a high temperature, so that the temperature characteristics of the timepiece advance at a low temperature and are delayed at a high temperature.

As a measure for improving the temperature dependence of the vibration cycle T, a configuration in which a bimetal is provided at a position that is rotationally symmetric in the balance wheel can be considered (see, for example, Non-Patent Document 1 below). The bimetal is formed by laminating plate materials having different coefficients of thermal expansion.
According to this configuration, when the temperature rises, the bimetal is deformed, for example, inward in the radial direction due to the difference in the coefficient of thermal expansion of each plate material. As a result, the average diameter of the balance wheel is reduced, so that the moment of inertia I can be reduced. As a result, it is considered that the temperature characteristic of the moment of inertia I can be corrected and the temperature dependence of the vibration period T can be suppressed.

Swiss Watch University Bias, "The Theory of Horology", English Edition 2nd Edition, April 2003, p136-137

For example, if the bimetal is not formed into a desired shape due to manufacturing variations or the like, the temperature coefficient of the bimetal (the amount of deformation of the bimetal with respect to a temperature change) becomes unstable, and the temperature characteristics of the bimetal may not be accurately corrected. was there. In such a case, a method of attaching a flickering screw to the bimetal to adjust the temperature characteristic of the moment of inertia I (the amount of change of the moment of inertia I with respect to the temperature change) can be considered.

However, in adjusting the temperature characteristics with the flicker screw, it was only possible to change the mounting presence / absence, the mounting position, and the weight of the flicker screw to be mounted, so it was not possible to make fine adjustments or continuous adjustment of the temperature characteristics. ..

The present invention provides a high-quality temperature-compensated balance sheet, movement, and timepiece that can easily and accurately adjust the temperature characteristics of the moment of inertia while suppressing changes in the rate, and have excellent temperature-compensation performance. ..

In order to solve the above problems, the temperature-compensated balance according to one aspect of the present invention has a balance extending along the first axis and a balance that can be rotated around the first axis by the power of a whiskers. It is provided with a balance sheet having a high expansion portion and a low expansion portion having different thermal expansion rates, and the balance plate main body changes in temperature due to a difference in thermal expansion coefficient between the high expansion portion and the low expansion portion. Correspondingly, it has a deformable portion that can be deformed in the radial direction orthogonal to the first axis, and a weight portion having a center of gravity at a position eccentric with respect to the second axis along the radial direction, and at least the weight portion is the first. It is provided with an adjusting portion that is rotatably attached to the deformed portion around the second axis in a state where movement in a direction along the two axes is restricted.

According to this aspect, since the radial deformation amount (distance from the first axis before and after deformation) of the deformed portion differs depending on the position in the circumferential direction, the center of gravity of the weight portion changes in the circumferential direction, so that the deformed portion is deformed. The amount of radial deformation of the accompanying weight can be changed (adjusted).
In particular, in this embodiment, the center of gravity of the weight portion can be continuously changed in the circumferential direction depending on the rotation position of the weight portion, so that the amount of radial deformation of the weight portion can be finely adjusted.
Moreover, in this embodiment, since the weight portion rotates in a state where the movement in the second axis direction is restricted, the movement of the weight portion in the radial direction due to the rotation of the weight portion can be suppressed. As a result, it is possible to suppress fluctuations in the average diameter (moment of inertia) of the balance sheet body due to a change in the position of the center of gravity of the weight portion.
As a result, it is possible to easily and accurately adjust the temperature characteristics of the moment of inertia while suppressing the change in the rate, and it is possible to provide a high-quality temperature-compensated balance with excellent temperature-compensation performance.

In the above aspect, the deformed portion is a bimetal in which the high expansion portion and the low expansion portion are overlapped in the radial direction and extend along the circumferential direction around the first axis. , A connecting portion for connecting the first end portion of the deformed portion in the circumferential direction and the balance plate may be provided.
According to this aspect, the average diameter of the balance sheet body can be changed by the deformation of the deformed portion, and the temperature characteristic of the moment of inertia can be corrected.
Moreover, by providing the deformed portion as a bimetal only in the rim portion of the balance, the degree of freedom in designing the connecting portion can be improved as compared with the case where the deformed portion is formed by the entire balance of the balance. Further, since the deformed portion is cantilevered and extends from the first end portion as a starting point, the radial deformation amount of the deformed portion with respect to the temperature change gradually increases from the fixed end to the free end. Therefore, by changing the center of gravity of the weight portion in the circumferential direction, the amount of radial deformation of the weight portion with respect to the temperature change can be gradually reduced or increased. As a result, the temperature characteristic of the moment of inertia can be adjusted more easily.

In the above aspect, the adjusting portion extends along the second axis and is located outside the shaft portion supported by the deformed portion and the shaft portion in the radial direction with respect to the deformed portion. The weight portion and the weight portion may be provided.
According to this aspect, since the weight portion can be operated from the outside of the balance sheet body, the temperature characteristics can be easily adjusted.

In the above aspect, the shaft portion and the weight portion may be integrally formed.
According to this aspect, since the shaft portion and the weight portion are integrally formed, the number of parts can be reduced and the configuration can be simplified.

In the above aspect, the shaft portion and the weight portion may be formed separately.
According to this aspect, a material or the like suitable for each of the shaft portion and the weight portion can be selected. Therefore, the degree of design freedom can be improved.

In the above aspect, the weight portion is formed with a flattening portion along the tangential direction of the virtual circle centered on the second axis in a side view seen from the radial direction, and the first axis in the deformed portion. The end edge facing the direction may be formed in parallel with the flattening portion in a state where the flattening portion faces the first axis direction.
According to this aspect, the amount of protrusion of the weight portion from the deformed portion in the first axis direction can be suppressed in a state where the flattening portion faces the first axis direction. As a result, it is possible to suppress an increase in size of the balance wheel in the direction of the first axis.
Further, when the weight portion is operated, the tool and the weight portion can be prevented from rotating by holding the weight portion by using the flattening portion. Therefore, it is not necessary to separately provide a tool locking portion on the weight portion, so that the degree of freedom in designing the weight portion can be improved.

In the above aspect, the deformed portion may be provided with attachment portions to which the adjusting portion is detachably attached at intervals in the circumferential direction around the first axis.
According to this aspect, since a plurality of mounting portions are formed on the deformed portion, the number of adjusting portions to be mounted on the deformed portion and the mounting position of the adjusting portion can be changed. As a result, the temperature characteristic of the moment of inertia can be adjusted with higher accuracy and over a wide range.

The movement according to one aspect of the present invention may include the temperature-compensated balance of the above-described aspect.
The watch according to one aspect of the present invention may include the movement of the above aspect.
According to this aspect, since the temperature-compensated balance of the present aspect is provided, a high-quality movement and watch can be provided.

According to the present invention, it is possible to easily and accurately adjust the temperature characteristics of the moment of inertia while suppressing changes in the rate, and to obtain a high-quality temperature-compensated balance sheet, movement and watch with excellent temperature compensation performance. Can be provided.

It is an external view of the timepiece which concerns on 1st Embodiment. It is a top view which looked at the movement which concerns on 1st Embodiment from the front side. It is a perspective view which looked at the balance | balance which concerns on 1st Embodiment from the front side. It is a side view of the balance sheet which concerns on 1st Embodiment. It is a partial plan view of the balance sheet which concerns on 1st Embodiment. It is a VI arrow view of FIG. It is a partial plan view of the balance sheet for demonstrating the operation of the deformed part. It is a side view of the balance sheet for demonstrating the operation of the adjustment part. It is a side view of the balance sheet for demonstrating the operation of the adjustment part. It is a partial plan view of the balance sheet for demonstrating the operation of the adjustment part. It is a partial plan view of the balance sheet for demonstrating the operation of the adjustment part. It is a partial cross-sectional view of the balance | balance which concerns on 2nd Embodiment. It is an arrow view of XIII of FIG. It is a perspective view of the balance | balance which concerns on 3rd Embodiment. It is sectional drawing which follows the XV-XV line of FIG.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In each of the embodiments described below, the corresponding configurations may be designated by the same reference numerals and the description thereof may be omitted.
(First Embodiment)
[clock]
FIG. 1 is an external view of the clock 1. In each of the drawings shown below, in order to make the drawings easier to see, some of the timepiece parts may be omitted and each timepiece part may be simplified.
As shown in FIG. 1, the watch 1 of the present embodiment is configured by incorporating a movement 2, a dial 3, various pointers 4 to 6, and the like in the watch case 7.

The watch case 7 includes a case main body 11, a case lid (not shown), and a cover glass 12. A crown 15 is provided at the 3 o'clock position (on the right side in FIG. 1) on the side surface of the case body 11. The crown 15 is for operating the movement 2 from the outside of the case body 11. The crown 15 is fixed to the winding stem 19 inserted in the case body 11.

[Movement]
FIG. 2 is a plan view of the movement 2 as viewed from the front side.
As shown in FIG. 2, the movement 2 is configured such that a plurality of rotating bodies (gears and the like) are rotatably supported on a main plate 21 constituting the substrate of the movement 2. In the following description, the cover glass 12 side (dial 3 side) of the watch case 7 is referred to as the "back side" of the movement 2 with respect to the main plate 21, and the case lid side (opposite to the dial 3 side) is referred to. It is referred to as the "front side" of the movement 2. Further, each of the rotating bodies described below is provided with the front and back surfaces of the movement 2 as the axial direction.

The winding stem 19 described above is incorporated in the main plate 21. The volume 19 is used for correcting the date and time. The winding stem 19 is rotatable around its axis and movable in the axial direction. The position of the winding stem 19 in the axial direction is determined by a switching device including a mandarin duck 23, a kanuki 24, a kanuki spring 25, and a back retainer 26.
When the winding wheel 19 is rotated, the wheel 31 is rotated through the rotation of the wheel (not shown). The rotation of the rotary wheel 31 causes the round hole wheel 32 and the square hole wheel 33 to rotate in order, and the mainspring (not shown) housed in the barrel wheel 34 is wound up.

The barrel wheel 34 is rotatably supported between the main plate 21 and the barrel receiver 35. The second wheel 41, the third wheel 42, and the fourth wheel 43 are rotatably supported between the main plate 21 and the train wheel receiving 45.
When the barrel wheel 34 rotates due to the restoring force of the barrel, the second wheel 41, the third wheel 42, and the fourth wheel 43 rotate in order due to the rotation of the barrel wheel 34. The barrel wheel 34, the second wheel 41, the third wheel 42, and the fourth wheel 43 form a front wheel train.

A minute hand 5 (see FIG. 1) is attached to the second wheel 41 of the above-mentioned front wheel train. The hour hand 4 described above is attached to a cylinder wheel (not shown) that rotates with the rotation of the second wheel 41. Further, the second hand 6 (see FIG. 1) is configured to rotate based on the rotation of the fourth wheel 43.

The movement 2 is equipped with a speed governor 51.
The speed governor 51 has an escape wheel 52, an ankle 53, and a balance sheet (temperature-compensated balance sheet) 54.

The escape wheel 52 is rotatably supported between the main plate 21 and the train wheel receiving 45. The escape wheel 52 rotates with the rotation of the fourth wheel 43.
The pallet fork 53 is rotatably supported between the main plate 21 and the pallet fork 55. The pallet fork 53 includes a pair of claw stones 56a and 56b. The claw stones 56a and 56b alternately engage with the escape gear 52a of the escape wheel 52 as the ankle 53 reciprocates. The escape wheel 52 temporarily stops rotating when one of the pair of claws 56a and 56b is engaged with the escape gear 52a. Further, the escape wheel 52 rotates when the pair of claw stones 56a and 56b are separated from the escape gear 52a. By continuously repeating these operations, the escape wheel 52 rotates intermittently. Then, the rotation of the front train wheel is controlled by the above-mentioned train wheel (front wheel train) operating intermittently by the intermittent rotational movement of the escape wheel 52.

<Tempu>
FIG. 3 is a perspective view of the balance with hairspring 54 as viewed from the front side. FIG. 4 is a side view of the balance with hairspring 54.
As shown in FIGS. 3 and 4, the balance with hairspring 54 controls the escape wheel 52 (the escape wheel 52 escapes at a constant speed). The balance with hairspring 54 has a balance with hairspring 61, a balance wheel 62, a hairspring 63, and an adjusting unit 64. The balance wheel 62 and the adjusting portion 64 constitute the balance sheet of the present embodiment.

As shown in FIG. 4, the balance sheet 61 is rotatably supported between the main plate 21 and the balance sheet 65 around the first axis O1. In the following description, the direction along the first axis O1 is referred to as the first axis direction, the direction orthogonal to the first axis O1 is referred to as the first radial direction, and the direction orbiting around the first axis O1 is referred to as the first circumferential direction. In some cases. In this case, the first axis direction coincides with the front and back directions.

The balance spring 61 rotates forward and reverse in a constant vibration cycle around the first axis O1 by the power transmitted from the hairspring 63. The front end of the balance with hairspring 61 in the first axis direction is supported by the balance with hairspring 65. The back end portion of the balance sheet 61 in the first axis direction is supported by the main plate 21.

The back end portion of the balance sheet 61 in the direction of the first axis is fitted to the swing seat 67. The swing seat 67 is formed in a tubular shape arranged coaxially with the first axis O1. A swing stone 68 is provided in a part of the swing seat 67 in the first circumferential direction. The swing stone 68 repeats engagement and disengagement of the pallet fork 53 with the pallet fork in synchronization with the reciprocating rotation of the balance with hairspring 54. As a result, the ankle 53 reciprocates, so that the claw stones 56a and 56b repeatedly engage with and disengage from the escape wheel 52.

As shown in FIG. 3, the balance wheel 62 is fixed to the front side in the first axis direction with respect to the swing seat 67 in the balance sheet 61. The balance wheel 62 includes a connecting portion 70 and a rim portion 73.

The connecting portion 70 connects the balance plate 61 and the rim portion 73. The connecting portion 70 includes a hub portion 71 and a ridge portion 72.
The hub portion 71 is fixed to the balancer 61 by press fitting or the like.
The Amida portion 72 projects from the hub portion 71 to the outside in the first radial direction. In the present embodiment, three Amida portions 72 are formed radially with respect to the first axis O1. The position of the ridges 72 in the first circumferential direction, the number of ridges 72, and the like can be changed as appropriate.

The rim portion 73 includes a plurality of deformed portions 80. Each of the deformed portions 80 is cantilevered and extends from each of the above-mentioned ridge portions 72 toward one side in the first circumferential direction. In the present embodiment, the deformed portion 80 is formed rotationally symmetric (in the present embodiment, three times symmetric) around the first axis O1. The rotation target is an example of an expression for characterizing a figure, and is a known concept. For example, when n is an integer of 2 or more and is rotated by (360 / n) ° around a certain center (in the case of a two-dimensional figure) or an axis (in the case of a three-dimensional figure), the property of overlapping with itself is symmetric or n times. It is called n-phase symmetry, (360 / n) degree symmetry, etc. For example, in the case of n = 3, when it is rotated by 120 °, it becomes symmetric three times, which overlaps with itself.

The rim portion 73 is formed in an annular shape as a whole, which is arranged coaxially with the first axis O1 by arranging the deformed portions 80 on the same circumference at intervals in the first circumferential direction. .. The rim portion 73 surrounds the periphery of the connecting portion 70 from the outside in the first radial direction.

The deformed portion 80 is a so-called bimetal in which two plate members having different coefficients of thermal expansion are superposed in the first radial direction. The deformed portion 80 includes a low expansion portion 81 located inside in the first radial direction and a high expansion portion 82 located outside in the first radial direction of the low expansion portion 81. The deformed portion 80 utilizes the difference in the coefficient of thermal expansion between the low expansion portion 81 and the high expansion portion 82 in the first radial direction starting from the fixed end (the boundary portion with the Amida portion 72) as the temperature changes. It is configured to be deformable. In the present embodiment, since the high expansion portion 82 is located outside in the first radial direction, the deformed portion 80 is deformed toward the inside in the first radial direction when the temperature rises. In the illustrated example, the thickness of the low expansion portion 81 in the first radial direction is thicker than that of the high expansion portion 82. However, the plate thicknesses of the low expansion portion 81 and the high expansion portion 82 can be changed as appropriate.

In the present embodiment, Invar (Ni—Fe alloy), silicon, ceramics, or the like is preferably used for the low expansion portion 81. Copper, a copper alloy, aluminum, or the like is preferably used for the high expansion portion 82. However, the materials of the low expansion portion 81 and the high expansion portion 82 can be changed as appropriate.

A mounting hole (mounting portion) 85 is formed at the free end (tip portion in the first circumferential direction) of the deformed portion 80. The mounting hole 85 penetrates the deformed portion 80 in the first radial direction. The formation position of the mounting hole 85 can be appropriately changed as long as it is formed at a position to be rotated with each other in each deformed portion 80.

The hairspring 63 is a spiral-shaped flat whiskers in a plan view seen from the first axis direction. The hairspring 63 is wound along the Archimedes curve. The inner end of the hairspring 63 is connected to the balance wheel 61 via a beard ball 87. The outer end of the hairspring 63 is connected to the balance with hairspring 65 via a whiskers (not shown). The hairspring 63 stores the power transmitted from the fourth wheel 43 to the escape wheel 52, and plays a role of transmitting the power to the balance wheel 61.

In the present embodiment, a constant elastic material (for example, a coelin bar) is preferably used for the hairspring 63. The hairspring 63 has a positive temperature characteristic with a Young's modulus in the operating temperature range. In this case, the temperature coefficient of Young's modulus of the whiskers 63 is adjusted so that the vibration period of the balance with hairspring 54 is as constant as possible with respect to the temperature characteristic of the moment of inertia of the balance with temperature change. However, the hairspring 63 may be formed of a material other than the constant elastic material. In this case, as the hairspring 63, it is possible to use a general steel material having a negative Young's modulus and a temperature coefficient (a characteristic in which the spring constant decreases as the temperature rises).

<Adjustment section>
FIG. 5 is a partial plan view of the balance with hairspring 54.
As shown in FIGS. 3 and 5, the adjusting portion 64 is separately attached to each of the above-mentioned deformed portions 80. That is, each adjusting unit 64 is provided at a position to be rotated around the first axis O1. The adjusting portion 64 includes an engaging portion 100, a pin member 101, and a weight portion 102. The adjusting portion 64 is formed in a rod shape extending along the second axis O2. In the present embodiment, the second axis O2 extends along the first radial direction. In the following description, the direction along the second axis O2 is referred to as the second axis direction (first radial direction), and the direction orthogonal to the second axis O2 is referred to as the second radial direction, and orbits around the second axis O2. The direction may be referred to as the second circumferential direction.

The engaging portion 100 is formed in a stepped tubular shape extending in the second axis direction. Specifically, the engaging portion 100 has a large diameter portion 110 located inside the second axis direction (inside the first radial direction) and a small diameter portion 110 located outside the large diameter portion 110 in the second axis direction. It has a unit 111 and.

The small diameter portion 111 is press-fitted into the mounting hole 85 of the deformed portion 80 from the inside in the second axis direction. As a result, the engaging portion 100 is in a state where the stepped surface 112 between the large diameter portion 110 and the small diameter portion 111 is in contact with or close to the inner peripheral surface of the deformed portion 80 from the inside in the second axis direction. It is fixed (engaged) to 80. The engaging portion 100 may be fixed to the deformed portion 80 by adhesion or the like.

The pin member 101 is arranged coaxially with the second axis O2. The pin member 101 includes a shaft portion 115 and a head portion 116.
The inner end portion of the shaft portion 115 in the second axis direction is press-fitted into the engaging portion 100 from the outside in the second axis direction.
The head portion 116 projects from the outer edge of the shaft portion 115 in the second axis direction. The center of gravity of the engaging portion 100 and the pin member 101 is located on the second axis O2 when viewed from the side in the direction of the second axis.

FIG. 6 is a view taken along the line VI of FIG.
As shown in FIG. 6, the weight portion 102 is rotatably attached to the shaft portion 115 around the second axis O2. Specifically, the weight portion 102 is attached to the outer end portion of the shaft portion 115 in the second axial direction in a state of being urged inward in the second radial direction. The weight portion 102 is formed in a C shape that surrounds the shaft portion 115 in a lateral view. Therefore, in the side view, the center of gravity G of the weight portion 102 is eccentric in the second radial direction with respect to the second axis O2.

The weight portion 102 is configured to be rotatable around the second axis O2 while sliding on the outer peripheral surface of the shaft portion 115. Therefore, as the weight portion 102 rotates, the center of gravity G of the weight portion 102 moves (revolves) around the second axis O2. As a result, the center of gravity G of the weight portion 102 moves along the first circumferential direction (specifically, the tangential direction of the outer peripheral surface of the deformed portion 80 through the mounting hole 85). The side view outer shape of the weight portion 102 is not limited to a circular shape, but may be a polygonal shape or the like. Further, in the present embodiment, the urging force of the weight portion 102 is used to position the shaft portion 115 in the second circumferential direction, but the configuration is not limited to this. For example, the weight portion 102 and the shaft portion 115 may be positioned in the second circumferential direction by unevenness or the like that can be overcome in the second circumferential direction.

In the weight portion 102 of the present embodiment, flattening portions 120 are formed at both ends in the second circumferential direction. The flat surface 120 is a flat surface extending along the tangential direction of the virtual circle centered on the second axis O2. The flattening portion 120 is arranged in parallel with both end edges of the deformed portion 80 facing the first axis direction in a state of facing the first axis direction. In the illustrated example, the thickness of the weight portion 102 in the second radial direction is uniformly formed over the entire circumference. However, the thickness of the weight portion 102 may be changed depending on the position in the second circumferential direction.

The position of the center of gravity of the weight portion 102 (the amount of eccentricity of the center of gravity G) can be changed as appropriate. Examples of the method of changing the position of the center of gravity of the weight portion 102 include changing the shape of the weight portion 102 and changing the specific gravity of the weight portion 102. For example, for the weight portion 102, a material having a relatively large specific gravity (compared to, for example, the engaging portion 100 or the pin member 101) can be selected. In this case, gold (Au), platinum (Pt), tungsten (W), or the like is preferably used for the weight portion 102.

The weight portion 102 is sandwiched between the outer peripheral surface of the deformed portion 80 and the head portion 116 in the second axis direction. As a result, the weight portion 102 is restricted from moving in the second axis direction by the deformed portion 80 and the pin member 101. A slight gap may be formed between the weight portion 102 and the outer peripheral surface of the deformed portion 80, or between the weight portion 102 and the head 116.

In the present embodiment, the configuration in which only the weight portion 102 can rotate around the second axis O2 has been described, but the configuration is not limited to this configuration. That is, the adjusting portion 64 has a configuration in which the engaging portion 100 and the pin member 101 can rotate together with the weight portion 102 in addition to the weight portion 102, provided that the weight portion 102 can rotate at least around the second axis O2. There may be. That is, the adjusting portion 64 itself rotates by inserting the engaging portion 100 into the mounting hole 85, fixing the pin member 101 to the engaging portion 100, and fixing the weight portion 102 to the pin member 101. It may be a possible configuration. Further, the pin member 101 and the weight portion 102 may be rotatably configured by fixing the engaging portion 100 in the mounting hole 85 and inserting the pin member 101 into the engaging portion 100.

[Temperature coefficient correction method]
Next, in the above-mentioned balance with hairspring 54, a method for correcting the temperature coefficient will be described. FIG. 7 is a partial plan view of the balance with hairspring 54 for explaining the operation of the deformed portion 80.
As shown in FIG. 7, in the balance with hairspring 54 of the present embodiment, when a temperature change occurs, the deformed portion 80 is bent and deformed due to the difference in the coefficient of thermal expansion between the low expansion portion 81 and the high expansion portion 82. Specifically, when the temperature rises with respect to a predetermined temperature T0 (normal temperature (for example, about 23 ° C.)), the high expansion portion 82 expands more than the low expansion portion 81. As a result, the deformed portion 80 is deformed inward in the first radial direction (reference numeral A in FIG. 7). When the temperature drops with respect to the predetermined temperature T0, the high expansion portion 82 contracts more than the low expansion portion 81. As a result, the deformed portion 80 is deformed outward in the first radial direction (reference numeral B in FIG. 7).

When the deformed portion 80 is deformed, the distance between the free end of the deformed portion 80 and the first axis O1 in the first radial direction changes. Specifically, the distance R0 between the free end of the deformed portion 80 at a predetermined temperature T0 and the first axis O1 in the first radial direction is set, and the free end of the deformed portion 80 and the first axis O1 when the temperature rises When the distance in the first radial direction is R1, the difference between the distance R0 and the distance R1 is the amount of change in radius ΔR1 in the first radial direction when the temperature rises. On the other hand, when the distance between the free end of the deformed portion 80 and the first axis O1 in the first radial direction when the temperature drops is R2, the difference between the distance R0 and the distance R2 is the first radial direction when the temperature drops. The amount of change in radius ΔR2 at. The radial deformation amounts ΔR1 and ΔR2 gradually increase from the fixed end to the free end.

Then, the average diameter of the balance wheel 62 can be reduced or increased according to the amount of change in radius ΔR1 and ΔR2, and the moment of inertia around the first axis O1 of the balance wheel 62 can be changed. That is, when the temperature rises, the average diameter of the balance wheel 62 can be reduced to reduce the moment of inertia. When the temperature drops, the average diameter of the balance wheel 62 can be increased to increase the moment of inertia. Thereby, the temperature characteristic of the moment of inertia can be corrected.

By the way, if the deformed portion is not formed into a desired shape due to manufacturing variation or the like, the deformation amount of the deformed portion 80 with respect to the temperature change may vary, and the temperature characteristic may not be accurately corrected by the deformed portion 80. is there.

Therefore, in the present embodiment, the position of the center of gravity of the weight portion 102 in the first circumferential direction can be changed according to the temperature coefficient of the deformed portion 80. Specifically, as shown in FIG. 5, the position where the center of gravity G of the weight portion 102 and the second axis O2 are aligned in the direction of the first axis is set as the reference position.

8 and 9 are side views corresponding to FIG. 5 for explaining the operation of the adjusting unit 64. 10 and 11 are partial plan views of the balance with hairspring 54 for explaining the operation of the adjusting unit 64.
As shown in FIGS. 8 and 10, when the temperature coefficient of the deformed portion 80 is higher than a desired value, the weight portion 102 is rotated around the second axis O2, and the center of gravity G of the weight portion 102 is changed to the deformed portion 80. Move closer to the fixed end of. As a result, the amount of change in the radius of the weight portion 102 with respect to the temperature change can be reduced and the moment of inertia of the balance wheel 62 can be reduced as compared with the case where the weight portion 102 is in the reference position.

On the other hand, as shown in FIGS. 9 and 11, when the temperature coefficient of the deformed portion 80 is lower than the desired value, the weight portion 102 is rotated around the second axis O2 to deform the center of gravity G of the weight portion 102. Move the part 80 toward the free end. As a result, the amount of radial deformation of the weight portion 102 with respect to the temperature change can be increased and the moment of inertia of the balance wheel 62 can be increased as compared with the case where the weight portion 102 is in the reference position.

As described above, according to the present embodiment, the weight portion 102 having the center of gravity G at a position eccentric with respect to the second axis O2 is configured to be rotatable around the second axis O2.
According to this configuration, the amount of radial deformation of the deformed portion 80 differs depending on the position in the first circumferential direction. Therefore, the center of gravity G of the weight portion 102 changes in the first circumferential direction, so that the weight portion that accompanies the deformation of the deformed portion 80 The amount of radial deformation of 102 can be changed (adjusted).
In particular, in the present embodiment, the center of gravity G of the weight portion 102 can be continuously changed in the circumferential direction depending on the rotation position of the weight portion 102, so that the amount of radial deformation of the weight portion 102 can be finely adjusted.
Moreover, since the weight portion 102 rotates in a state where the movement in the first radial direction is restricted by the deformed portion 80 and the head 116, the movement of the weight portion 102 in the first radial direction accompanying the rotation of the weight portion 102 Can be suppressed. As a result, fluctuations in the average diameter of the balance wheel 62 due to the change in the position of the center of gravity of the weight portion 102 can be suppressed.
As a result, it is possible to easily and highly accurately adjust the temperature coefficient while suppressing the change in the rate, and it is possible to provide a high-quality balance sheet 54 having excellent temperature compensation performance.

In the present embodiment, the structure has a deformed portion 80 in which the low expansion portion 81 and the high expansion portion 82 are overlapped.
According to this configuration, the average diameter of the balance wheel 62 can be changed by the deformation of the deformed portion 80, and the temperature characteristic of the moment of inertia can be corrected.
Moreover, by providing the deformed portion 80 as a bimetal only in the rim portion 73 of the balance with hairspring 54, it is possible to improve the degree of freedom in designing the connecting portion 70 and the like as compared with the case where the deformed portion is formed by the entire balance plate body. Further, since the deformed portion 80 is cantilevered and extends, the amount of radial deformation of the deformed portion 80 with respect to the temperature change gradually increases from the fixed end to the free end. Therefore, by changing the center of gravity G of the weight portion 102 in the circumferential direction, the amount of radial deformation of the weight portion 102 with respect to the temperature change can be gradually reduced or increased. As a result, the temperature characteristic of the moment of inertia can be adjusted more easily.

In the present embodiment, the weight portion 102 is arranged outside the first radial direction (second axial direction) with respect to the deformed portion 80.
According to this configuration, the weight portion 102 can be operated from the outside of the balance with hairspring 54, so that the temperature characteristics can be easily adjusted.

In the present embodiment, the shaft portion 115 and the weight portion 102 are formed as separate bodies.
According to this configuration, a material or the like suitable for each of the shaft portion 115 and the weight portion 102 can be selected. Therefore, the degree of design freedom can be improved.

In the present embodiment, the edge of the deformed portion 80 facing the first axis direction is formed in parallel with the planing portion 120 with the flattening portion 120 facing the first axis direction.
According to this configuration, the amount of protrusion of the weight portion 102 from the deformed portion 80 in the first axis direction can be suppressed in a state where the flattening portion 120 faces the first axis direction. As a result, it is possible to suppress the increase in size of the balance wheel 62 in the direction of the first axis.
Further, when the weight portion 102 is operated, the tool and the weight portion 102 can be prevented from rotating by holding the weight portion 102 by using the flattening portion 120. Therefore, it is not necessary to separately provide the tool locking portion on the weight portion 102, so that the degree of freedom in designing the weight portion 102 can be improved.

Since the movement 2 and the timepiece 1 of the present embodiment include the above-mentioned balance with hairspring 54, it is possible to provide the movement 2 and the timepiece 1 of high quality with little variation in the rate.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described. FIG. 12 is a partial cross-sectional view of the balance with hairspring 54 according to the second embodiment. FIG. 13 is an arrow view of XIII of FIG. The present embodiment is different from the above-described first embodiment in that the shaft portion 201 and the weight portion 202 are integrally formed in the adjusting portion 200.
The adjusting portion 200 shown in FIGS. 12 and 13 includes an engaging portion 100 and a pin member 210.
The small diameter portion 111 of the engaging portion 100 is inserted into the mounting hole 85.

The pin member 210 includes a shaft portion 201 and a weight portion 202.
The shaft portion 201 is press-fitted into the engaging portion 100 through the mounting hole 85. As a result, the pin member 210 is configured to be rotatable around the second axis O2 together with the engaging portion 100.

The weight portion 202 is formed at the outer end portion of the shaft portion 201 in the direction of the second axis. The weight portion 202 has an enlarged diameter with respect to the shaft portion 201. The weight portion 202 sandwiches the deformed portion 80 in the second axis direction with the stepped surface 112 of the engaging portion 100. As a result, the movement of the weight portion 202 with respect to the deformed portion 80 in the second axis direction is restricted.

As shown in FIG. 13, the weight portion 202 is formed in a circular shape centered on a position eccentric from the second axis O2 in a side view. As a result, the center of gravity G of the weight portion 202 is eccentric from the second axis O2 in the side view. However, the shape of the weight portion 202 can be changed as appropriate.

A tool locking portion 211 is formed on the outer end surface of the weight portion 202 in the second axis direction. The tool locking portion 211 is a groove that passes through the center of gravity G and extends linearly along the second radial direction. The tool locking portion 211 is configured so that the tool can be locked. That is, the adjusting unit 200 is configured to be rotatable around the second axis O2 via a tool locked to the tool locking unit 211. The tool locking portion 211 is not limited to the groove as long as it can be locked to the tool.

According to the present embodiment, the adjusting unit 200 rotates around the second axis O2 by rotating the tool around the second axis O2 while the tool is locked to the tool locking unit 211. As a result, the center of gravity G of the weight portion 202 moves in the first circumferential direction. As a result, the same action and effect as those of the first embodiment described above are obtained.
Further, in the present embodiment, since the shaft portion 201 and the weight portion 102 are integrally formed, the number of parts can be reduced and the configuration can be simplified.

(Third Embodiment)
Next, a third embodiment according to the present invention will be described. FIG. 14 is a perspective view of the balance with hairspring 54 according to the third embodiment. This embodiment is different from each of the above-described embodiments in that the mounting position of the adjusting unit 301 can be changed.
In the balance with hairspring 54 shown in FIG. 14, a plurality of mounting holes 310 are formed in each deformed portion 80. In the present embodiment, the mounting holes 310 are formed at intervals in the first circumferential direction.

FIG. 15 is a cross-sectional view taken along the line XV-XV of FIG.
As shown in FIGS. 14 and 15, the adjusting portion 301 is detachably attached to the deformed portion 80 through at least one of the mounting holes 310 among the mounting holes 310.

In the adjusting portion 301, a male screw portion 311 is formed on the shaft portion 115 of the pin member 101. The male threaded portion 311 is formed in a portion of the shaft portion 115 that protrudes inward in the second axis direction with respect to at least the deformed portion 80.

A female screw portion 321 is formed on the inner peripheral surface of the engaging portion 320. The engaging portion 320 is detachably attached to the shaft portion 115 by screwing the female screw portion 321 to the male screw portion 311.

In this embodiment, in addition to exhibiting the same effects as those of the above-mentioned first embodiment, the following effects are exhibited.
That is, since a plurality of mounting holes 310 are formed in the deformed portion 80, the number of adjusting portions 301 to be mounted on the deformed portion 80 and the mounting position of the adjusting portion 301 can be changed. As a result, the temperature characteristic of the moment of inertia can be adjusted with higher accuracy and over a wide range.

(Other variants)
The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the case where the bimetal is used as the deformed portion 80 has been described, but the present invention is not limited to this configuration. The deformed portion may have a configuration in which the average diameter of the balance wheel changes due to the relative deformation of the high expansion portion and the low expansion portion due to the temperature change. In this case, for example, in the balance wheel, one of the high-expansion portion and the low-expansion portion forms a protruding portion, and one of the high-expansion portion and the low-expansion portion forms a rim portion. May be good. In this case, the rim portion is not limited to cantilever and may be cantilevered. That is, the temperature-compensated balance according to the present invention may have a deformed portion in a part of the balance except the balance (temple body).

In the above-described embodiment, the configuration in which the weight portion is arranged outside the deformed portion 80 in the first radial direction has been described, but the configuration is not limited to this configuration. The weight portions may be arranged inside the deformed portion 80 in the first radial direction or on both sides in the first axial direction.
In the above-described embodiment, the configuration in which the adjusting portion is attached to the deformed portion 80 through the mounting hole has been described, but the configuration is not limited to this configuration. The adjusting portion may be configured to be rotatable around the second axis while at least the weight portion is restricted from moving in the direction along the second axis.
In the above-described embodiment, the configuration in which the moment of inertia is adjusted by the adjusting portion has been described, but in addition to this, a chisel screw or the like may be separately provided to adjust the moment of inertia of the balance wheel.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention, and each of the above-described modifications may be appropriately combined.

1 ... Clock 2 ... Movement 54 ... Temp 62 ... Temp wheel (temple body)
63 ... Beard mainspring 64,200,300 ... Adjustment section (temple body)
80 ... Deformation part 102, 202 ... Weight part 310 ... Mounting hole (mounting part)

Claims (9)

Tenshin extending along the first axis,
The balance spring is provided so as to be rotatable around the first axis by the power of the hairspring, and is provided with a balance sheet body having a high expansion portion and a low expansion portion having different coefficients of thermal expansion.
The body of the balance
Due to the difference in the coefficient of thermal expansion between the high expansion portion and the low expansion portion, a deformable portion that can be deformed in the radial direction orthogonal to the first axis according to a temperature change, and a deformable portion.
The second axis has a weight portion having a center of gravity at a position eccentric with respect to the second axis along the radial direction, and at least the weight portion is restricted from moving in the direction along the second axis. A temperature-compensated balance with an adjusting part that can be rotated around and attached to the deformed part. The deformed portion is a bimetal in which the high expansion portion and the low expansion portion are overlapped in the radial direction and extend along the circumferential direction around the first axis.
The temperature-compensated balance according to claim 1, wherein the balance sheet main body includes a connecting portion that connects the first end portion of the deformed portion in the circumferential direction and the balance sheet. The adjusting part
A shaft portion that extends along the second axis and is supported by the deformed portion, and a shaft portion.
The temperature-compensated balance according to claim 1 or 2, wherein the shaft portion includes the weight portion located outside the deformed portion in the radial direction. The temperature-compensated balance according to claim 3, wherein the shaft portion and the weight portion are integrally formed. The temperature-compensated balance according to claim 3, wherein the shaft portion and the weight portion are formed separately. The weight portion is formed with a flattening portion along the tangential direction of the virtual circle centered on the second axis in the side view seen from the radial direction.
The edges of the deformed portion that face the first axis direction are formed in parallel with the flattening portion in a state where the flattening portion faces the first axis direction, according to claims 3 to 5. The temperature-compensated balance according to any one item. Any one of claims 1 to 6, wherein mounting portions to which the adjusting portion is detachably attached are arranged on the deformed portion at intervals in the circumferential direction around the first axis. The temperature compensation type balance described in. A movement comprising the temperature-compensated balance according to any one of claims 1 to 7. A timepiece comprising the movement according to claim 8.

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