JP7060988B2 - Temperature-compensated balance, movement and watch - Google Patents

Description

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

The balance, which functions as the governor of a mechanical timepiece, is equipped with a balance extending along the axis, a balance wheel fixed to the balance, and a whiskers. The balance sheet and the balance wheel rotate forward and backward (vibrate) periodically around the axis as the whiskers expand and contract.

In the above-mentioned balance, it is important that the vibration cycle is set within a predetermined predetermined value. If the vibration cycle deviates from the specified value, the rate of the mechanical timepiece (the degree of delay or 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, and K represents the "spring constant" of the whiskers.

Based on the equation (1), when the moment of inertia I of the balance with hairspring 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 with hairspring changes. Specifically, the above-mentioned balance wheel 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. On the other hand, the hairspring may be formed of a material (for example, a steel material) having a Young's modulus having a negative temperature coefficient. In this case, as the temperature rises, the spring constant K decreases.
Therefore, as the temperature rises, the moment of inertia I increases and the spring constant K decreases, so that the vibration cycle T becomes longer. As a result, the vibration cycle T of the balance is short at low temperature and long at high temperature, so that the temperature characteristic of the timepiece advances at low temperature and is delayed at high temperature.

Therefore, as a measure for improving the temperature dependence of the vibration cycle T, it is conceivable to use a thermoelastic material (for example, coelin bar) as the material for the whiskers. It is considered that by using the thermoelastic material, the fluctuation of the spring constant K due to the temperature change can be suppressed and the temperature dependence of the vibration cycle T can be suppressed. However, in order to suppress fluctuations in the temperature coefficient of Young's modulus, strict manufacturing control is required, and there is a problem that it is difficult to manufacture whiskers.

On the other hand, as a measure for improving the temperature dependence of the vibration cycle T, a configuration in which a bimetal piece is provided at a position that is rotationally symmetric in the balance wheel can be considered (see, for example, Patent Document 1 below). The bimetal piece is formed by laminating plates having different coefficients of thermal expansion.
According to this configuration, when the temperature rises, the bimetal piece 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 cycle T can be suppressed.

Special Publication No. 43-26014

However, in the configuration of Patent Document 1 described above, when adjusting the temperature coefficient correction amount (the amount of change in the radial direction of the bimetal piece with respect to the temperature change) of each bimetal piece, a flickering screw or the like is separately attached to and detached from the bimetal piece. There is a need to. Therefore, the adjustment of the temperature coefficient correction amount is complicated, and it is difficult to make a highly accurate adjustment.
Further, when each bimetal piece is not formed into a desired shape due to, for example, manufacturing variation, the temperature coefficient correction amount of each bimetal piece tends to be unstable. When the temperature coefficient correction amount differs between each bimetal piece, the center of gravity of the balance shifts with respect to the rotation axis. As a result, one-sided weight of the balance may occur, and the fluctuation of the vibration cycle T depending on the posture of the balance may become large (so-called posture difference occurs).

The present invention provides a high-quality temperature-compensated balance sheet, movement, and watch that can easily and accurately adjust the temperature coefficient correction amount 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 has a balance with a balance body that rotates around the first axis by the power of a whiskers. , Materials having different coefficients of thermal expansion are linearly extended along the second axis perpendicular to the first axis from positions that are rotationally symmetric around the first axis in the balance body, respectively, to the second axis. It includes a bimetal piece laminated in the intersecting direction, and an adjusting portion having a weight portion attached to the bimetal piece so as to be movable in the direction of the second axis along the second axis.

According to this aspect, the average diameter of the balance sheet changes due to the deformation of the bimetal piece with the temperature change. Thereby, the temperature characteristic of the moment of inertia can be corrected.
In particular, in this embodiment, the position of the center of gravity of the weight portion in the second axis direction can be changed by adjusting the position of the weight portion in the second axis direction with respect to the bimetal piece. This makes it possible to continuously adjust the temperature coefficient of the moment of inertia of the balance. As a result, the temperature coefficient correction amount can be adjusted easily and with high accuracy as compared with the conventional configuration in which another part such as a flickering screw is attached and detached.

In the above embodiment, the balancen body has the balance with the balance and a rim portion surrounding the balance from the outside in the first radial direction orthogonal to the first axis, and the balance wheel attached to the balance. , And the adjusting portion may extend from the rim portion.
According to this aspect, since the adjusting portion is provided on the rim portion of the balance wheel, the adjusting portion can be kept away from the first axis in the first radial direction. As a result, the amount of radial deformation of the adjusting portion (in the first radial direction, the distance between the tip of the adjusting portion and the first axis at a predetermined temperature, and the tip of the adjusting portion and the first axis when the temperature changes). The difference in distance) can be increased, and the amount of temperature coefficient correction by the bimetal piece can be increased.

The temperature-compensated balance according to one aspect of the present invention has a balance extending along the first axis, a balance with the balance of the first axis rotated by the power of a whiskers, and the first in the balance. A bimetal piece extending along the second axis from a position that is rotationally symmetric around one axis and laminated in a direction in which materials having different coefficients of thermal expansion intersect the second axis, a second along the second axis. It comprises an adjusting portion having a weight portion attached to the bimetal piece so as to be movable in two axial directions, and the weight portion includes a fixing portion fixed to the bimetal piece and the second portion with respect to the fixing portion. It is equipped with a movable part that is movably attached in the axial direction .
According to this embodiment, only the movable portion of the weight portion moves with respect to the fixed portion and the bimetal piece, so that the effective length of the bimetal piece accompanying the movement of the movable portion (the bimetal piece of the adjusting portion is exposed). There is no change in the length of the part). That is, since only the position of the center of gravity of the weight portion can be changed (the deformation example of the bimetal piece does not change with respect to the temperature change), the temperature coefficient correction amount can be adjusted more easily.

In the above embodiment, the bimetal piece may be cantileveredly extended from the balance body, and the weight portion may be attached to the tip end portion of the bimetal piece.
According to this aspect, since the adjusting portion is cantilevered and extended, the amount of radial deformation due to the temperature change can be secured, and the amount of temperature coefficient correction by the bimetal piece can be increased.
Moreover, since the weight portion is attached to the tip portion of the bimetal piece, the weight of the tip portion, which is the maximum deformation portion of the adjusting portion, can be increased. Therefore, the amount of temperature coefficient correction by the bimetal piece can be increased. Further, by attaching the weight portion to the tip portion of the bimetal piece, the base end portion of the adjusting portion can be stably held by the balance sheet body. As a result, it is possible to suppress rattling of the entire adjusting portion due to the adjustment of the weight portion, and it is possible to adjust the temperature coefficient correction amount with higher accuracy.

The temperature-compensated balance according to one aspect of the present invention has a balance extending along the first axis, a balance with the balance of the first axis rotated by the power of a whiskers, and the first in the balance. A bimetal piece extending along the second axis from a position that is rotationally symmetric about one axis and laminated in a direction in which materials having different coefficients of thermal expansion intersect the second axis, a second along the second axis. It is provided with an adjusting portion having a weight portion attached to the bimetal piece so as to be movable in the two-axis direction, and the adjusting portion is supported by the balance body so as to be position-adjustable around the second axis .
According to this aspect, since the adjusting portion is configured so that the position can be adjusted around the second axis, the orientation of the bimetal piece can be changed according to the temperature coefficient of Young's modulus in the hairspring. As a result, the temperature coefficient correction amount of the bimetal piece can be changed to both positive and negative, and the temperature coefficient of the moment of inertia of the balance can be corrected to both positive and negative. That is, the variation in the temperature coefficient of Young's modulus can be easily canceled by the temperature characteristic of the moment of inertia of the balance. In particular, as in this embodiment, the temperature coefficient correction amount can be adjusted with higher accuracy by adjusting the moment of inertia of the balance with the orientation of the bimetal piece in addition to the position of the weight portion. As a result, the vibration cycle of the balance can be kept constant, and the balance with excellent temperature compensation characteristics can be provided.
Moreover, in this embodiment, even if the orientation of the bimetal piece is changed, the length of the adjusting portion in the second axis direction is kept constant. Therefore, unlike the case where the effective length of the bimetal piece is changed as in the conventional case, it is possible to prevent the center of gravity of the balance from shifting at a predetermined temperature (normal temperature (for example, about 23 ° C.)). As a result, the occurrence of one-sided weight can be suppressed and the posture difference can be reduced.

In the above embodiment, the hairspring may be formed of a thermoelastic material.
According to this aspect, the change in Young's modulus due to the temperature change can be reduced, and the temperature dependence of the vibration cycle can be suppressed. Moreover, in this embodiment, since the variation in the temperature coefficient of Young's modulus can be corrected by the rotation angle of the adjusting unit, the manufacturing control at the time of manufacturing the whiskers becomes easy. Therefore, it is possible to improve the manufacturing efficiency of the whiskers and reduce the cost.

In the above embodiment, the center of gravity of the bimetal piece may be located on the second axis.
According to this aspect, since the center of gravity of the adjusting portion is located on the second axis, when the position of the weight portion in the second axis direction is adjusted, the center of gravity of the adjusting portion is second depending on the position of the weight portion. It is possible to prevent the axis from deviating from the axis. As a result, it is possible to suppress the shift of the center of gravity of the balance according to the rotation angle of the adjusting portion, so that the posture difference can be reliably reduced.

The movement according to one aspect of the present invention may include the temperature-compensated balance of the above-mentioned aspect.
The watch according to one aspect of the present invention may be provided with the movement of the above aspect.
According to this aspect, since the temperature-compensated balance of the present aspect is provided, it is possible to provide a high-quality movement and a timepiece with little variation in step rate.

According to the present invention, it is possible to easily and highly accurately adjust the temperature coefficient correction amount, and to provide a high-quality temperature-compensated balance with excellent temperature-compensation performance, a movement, and a timepiece.

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 top view which looked at the balance | balance which concerns on 1st Embodiment from the front side. It is a side view of the balance | balance which concerns on 1st Embodiment. It is sectional drawing corresponding to the VV line of FIG. It is an exploded perspective view of the adjustment part which concerns on 1st Embodiment. 6 is a cross-sectional view taken along the line VII-VII of FIG. It is sectional drawing corresponding to FIG. It is a partial plan view of the balance for explaining the operation of the adjustment part. It is sectional drawing which shows the adjustment part enlarged in the state which the adjustment part is in a reference position. FIG. 3 is an enlarged cross-sectional view showing the adjusting portion in a state where the rotation angle θ of the adjusting portion is 45 (deg). FIG. 3 is an enlarged cross-sectional view showing the adjusting portion in a state where the rotation angle θ of the adjusting portion is 90 (deg). It is sectional drawing which shows the adjustment part enlarged in the state that the rotation angle θ of the adjustment part is −45 (deg). It is sectional drawing which enlarges and shows the adjustment part in the state that the rotation angle θ of the adjustment part is −90 (deg). It is a graph which shows the relationship between the orientation of a bimetal piece, and the amount of deformation of a bimetal piece when the rotation angle θ of an adjustment part is changed from −90 (deg) to 90 (deg). It is a graph which shows the relationship between the rotation angle θ of the adjustment part, and the radius change amount ΔR. It is a graph which shows the relationship between the temperature (° C) and the rate by the difference of the temperature coefficient of the Young's modulus of the whiskers. It is a perspective view of the adjustment part which concerns on 2nd Embodiment. It is sectional drawing which follows the XIX-XIX line of FIG. It is a perspective view of the adjustment part which concerns on 3rd Embodiment. It is sectional drawing which follows the XXI-XXI line of FIG. It is a top view which looked at the balance | balance which concerns on a modification. It is a partial plan view of the balance | balance which concerns on a modification.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In each embodiment 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 clock parts may be omitted and the clock parts 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 a 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 by rotatably supporting a plurality of rotating bodies (gears and the like) 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 mandarin duck 24, a mandarin duck spring 25, and a back presser 26.
When the winding wheel 19 is rotated, the wheel 31 is rotated through the rotation of the wheel (not shown). The round hole wheel 32 and the square hole wheel 33 rotate in order due to the rotation of the rotary wheel 31, and the royal fern (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 royal fern, 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 car 34, the second car 41, the third car 42, and the fourth car 43 form a front wheel train.

Of the above-mentioned front wheel trains, the minute hand 5 (see FIG. 1) is attached to the second wheel 41. 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 53a. By continuously repeating these operations, the escape wheel 52 rotates intermittently. Then, the rotation of the front train wheel is controlled by the intermittent operation of the above-mentioned train wheel (front wheel train) due to the intermittent rotational movement of the escape wheel 52.

<Tempu>
FIG. 3 is a plan 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 speed of the escape wheel 52 (the escape wheel 52 escapes at a constant speed). The balance with hairspring 54 mainly has a balance with hairspring 61, a balance with hairspring 62, and a balance spring 63.

As shown in FIG. 4, the balance with hairspring 61 is rotatably supported around the first axis O1 between the main plate 21 and the balance with hairspring 65. 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 direction of the first axis coincides with the direction of the front and back surfaces.

The balance spring 61 rotates forward and reverse with a constant vibration cycle around the first axis O1 by the power transmitted from the hairspring 63. The front end portion of the balance sheet 61 in the direction of the first axis is supported by the balance sheet 65 via a bearing (not shown). The back end portion of the balance sheet 61 in the direction of the first axis is supported by a bearing (not shown) formed on the main plate 21.

A swing seat 67 is externally fitted to the back end portion of the balance sheet 61 in the direction of the first axis. The swing seat 67 is formed in a tubular shape arranged coaxially with the first axis line 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 mainly includes a hub portion 71, an adduct portion 72, and a rim portion 73. In the present embodiment, the hub portion 71, the ridge portion 72, and the rim portion 73 are integrally formed of a metal material (for example, brass or the like).

The hub portion 71 is fixed to the balance plate 61 by press fitting or the like.
The Amida portion 72 is projected from the hub portion 71 to the outside in the first radial direction. In the present embodiment, the position of the ridges 72 in the first circumferential direction, the number of ridges 72, and the like can be appropriately changed.

The rim portion 73 is formed in an annular shape arranged coaxially with the first axis line O1 as a whole by connecting both ends of the pair of rim pieces 75 in the first circumferential direction. The rim portion 73 surrounds the hub portion 71 from the outside in the first radial direction. The outer peripheral end portion of the ridge portion 72 in the first radial direction is connected to the inner peripheral surface of the rim portion 73.

Each rim piece 75 is formed to be rotationally symmetric (in the present embodiment, twice 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, let n be an integer of 2 or more, and if it 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 = 2, when it is rotated by 180 °, it becomes symmetric twice, which overlaps with itself.

Each rim piece 75 has an arc portion 76, a first bent portion 77, and a second bent portion 78.
Each arc portion 76 is formed in an arc shape having the same radius of curvature about the first axis O1.
The first bent portion 77 is connected to the first end portion of the arc portion 76 in the first circumferential direction. The first bent portion 77 is bent from the arc portion 76 toward the first axis O1 along the tangential direction of the rim portion 73.
The second bent portion 78 is connected to the second end portion of the arc portion 76 in the first circumferential direction. The second bent portion 78 is bent from the arc portion 76 toward the first axis O1 along the tangential direction of the rim portion 73.

Of each rim piece 75, the first bent portion 77 of one rim piece 75 is connected to the second bent portion 78 of the other rim piece 75. Of each rim piece 75, the second bent portion 78 of one rim piece 75 is connected to the first bent portion 77 of the other rim piece 75. As a result, the rim portion 73 is integrally formed in an annular shape. In the present embodiment, the first bent portion 77 of one rim piece 75 (or the other rim piece 75) and the second bent portion 78 of the other rim piece 75 (or one rim piece 75) are orthogonal to each other. ing.

The hairspring 63 is a spiral-shaped flat hair 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 spring 61 via a hairspring 79. The outer end of the hairspring 63 is connected to the balance with hairspring 65 via a hairspring (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 it to the balance wheel 61.

In the present embodiment, a thermoelastic material (for example, a coelin bar or the like) 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 cycle 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 elasticity 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 that the spring constant decreases with an increase in temperature).

<Adjustment section>
Here, the adjusting portion 100 is cantileveredly supported by the first bent portion 77 of each of the above-mentioned rim pieces 75. The adjusting portion 100 is formed inside the rim portion 73 in a rod shape extending along the second axis O2 parallel to the tangent line of the rim portion 73. In the following description, the direction along the second axis O2 is referred to as the second axis direction, the direction orthogonal to the second axis O2 is referred to as the second radial direction, and the direction orbiting around the second axis O2 is the second. Sometimes referred to as the circumferential direction. In the present embodiment, each adjusting unit 100 is formed rotationally symmetrically around the first axis O1. Therefore, in the following description, one of the adjusting units 100 will be described as an example.

FIG. 5 is a cross-sectional view taken along the line VV of FIG.
As shown in FIG. 5, the above-mentioned first bent portion 77 is formed with a mounting hole 101 that penetrates the first bent portion 77 in the second axis direction. The mounting hole 101 is formed in a circular shape (perfect circular shape) when viewed from the front in the direction of the second axis. The shape of the mounting hole 101 is not limited to a circular shape, and may be a rectangular shape, a triangular shape, or the like.

Slits 102 are formed in the first bent portion 77 at portions located on both sides in the second radial direction with respect to the mounting hole 101. Each slit 102 extends in the second radial direction, and the inner end portion in the second radial direction communicates with the mounting hole 101. Each slit 102 penetrates the first bent portion 77 in the second axis direction.

As shown in FIG. 3, the adjusting portion 100 is formed by connecting the holding portion 120, the bimetal piece 121, and the weight portion 122 from the base end side (fixed end side) to the tip end side (free end side) in the second axis direction. Has been done.

FIG. 6 is an exploded perspective view of the adjusting unit 100.
As shown in FIGS. 3 and 6, the holding portion 120 is formed of, for example, a metal material. The holding portion 120 has a bottomed cylindrical shape that opens toward the tip end side of the adjusting portion 100 in the direction of the second axis. The holding portion 120 is formed in a circular shape when viewed from the front along the second axis, corresponding to the mounting hole 101 described above. The holding portion 120 is press-fitted (elastically held) into the mounting hole 101.

As shown in FIG. 5, the tightening allowance between the holding portion 120 and the mounting hole 101 is adjusted when a predetermined torque is applied to the adjusting portion 100 around the second axis O2 (second circumferential direction). The unit 100 is set so as to be rotatable around the second axis O2. That is, the adjusting portion 100 of the present embodiment is positioned around the second axis O2 by rotating around the second axis O2 while the outer peripheral surface of the holding portion 120 slides on the inner peripheral surface of the mounting hole 101. Is configured to be adjustable. The cross-sectional shape of the holding portion 120 is not limited to a circular shape, but may be a rectangular shape, a triangular shape, or the like. Further, in the present embodiment, the case where the cross-sectional shape of the holding portion 120 is formed corresponding to the mounting hole 101 has been described, but if the holding portion 120 is configured to be rotatable around the second axis O2, The holding portion 120 and the mounting hole 101 may be different from each other.

As shown in FIG. 3, the base end portion of the holding portion 120 in the second axis direction protrudes to the outside of the rim portion 73 with respect to the first bent portion 77. Specifically, the base end portion of the holding portion 120 is a portion of the rim portion 73 defined by the first bent portion 77 of one rim piece 75 and the second bent portion 78 of the other rim piece 75. Is housed in.

As shown in FIG. 4, a locking portion 126 is formed on the base end surface of the holding portion 120. The locking portion 126 is a groove extending linearly along the second radial direction. A tool can be locked to the locking portion 126. That is, the adjusting portion 100 is configured to be rotatable around the second axis O2 via a tool locked to the locking portion 126. The locking portion 126 is not limited to the groove as long as it can be locked to the tool.

As shown in FIGS. 3 and 5, the bimetal piece 121 is fixed in the holding portion 120. For example, the bimetal piece 121 is press-fitted or inserted into the holding portion 120, and is fixed to the holding portion 120 with an adhesive or the like. The bimetal piece 121 is formed in a plate shape extending linearly along the second axis direction.

The bimetal piece 121 is configured by stacking two plates (low expansion member 130 and high expansion member 131) having different coefficients of thermal expansion in the second radial direction. In the present embodiment, Invar (Ni—Fe alloy), silicon, ceramics and the like are preferably used for the low expansion member 130. Copper, a copper alloy, aluminum, or the like is preferably used for the high expansion member 131. The low expansion member 130 and the high expansion member 131 have the same shape as each other (the cross-sectional shape orthogonal to the second axis O2 is rectangular). In the illustrated example, the boundary portion between the low expansion member 130 and the high expansion member 131 is located on the second axis O2. The center of gravity of the adjusting unit 100 is preferably located on the second axis O2. Therefore, the plate thicknesses of the low expansion member 130 and the high expansion member 131 may be different from each other (the plate thickness can be changed as appropriate). When the plate thicknesses of the low expansion member 130 and the high expansion member 131 are different, the boundary portion between the low expansion member 130 and the high expansion member 131 extends parallel to the second axis O2.

The bimetal piece 121 (low expansion member 130 and high expansion member 131) is configured so that the orientation in the second radial direction can be changed as the adjusting portion 100 rotates around the second axis O. The bimetal piece 121 is configured to be deformable in the second radial direction with a temperature change by utilizing the difference in the coefficient of thermal expansion between the low expansion member 130 and the high expansion member 131. The specific operation of the bimetal piece 121 will be described later.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 8 is a cross-sectional view corresponding to FIG. 7.
As shown in FIGS. 6 to 8, the weight portion 122 includes a fixed portion 140 and a movable portion 141. In this embodiment, both the fixed portion 140 and the movable portion 141 are made of a metal material.

The fixing portion 140 is formed in a tubular shape coaxially arranged with the second axis O2. The through hole 143 of the fixing portion 140 is formed in a stepped shape in which the inner diameter gradually decreases toward the tip end side in the second axis direction. Specifically, the through hole 143 has a large diameter portion 143a located on the base end side in the second axis direction, a small diameter portion 143b located on the tip end side in the second axis direction, and the large diameter portion 143a and the small diameter portion 143b. It has a stepped surface 143c and the like for connecting the above.

The tip of the bimetal piece 121 is fixed in the large diameter portion 143a. For example, the bimetal piece 121 is press-fitted or inserted into the fixing portion 140, and is fixed to the fixing portion 140 with an adhesive or the like. The tip surface of the bimetal piece 121 is close to or in contact with the stepped surface 143c in the large diameter portion 143a in the second axis direction. As a result, the fixing portion 140 is positioned with respect to the bimetal piece 121 in the second axis direction.

A female screw portion is formed on the inner peripheral surface of the small diameter portion 143b. The inner diameter of the through hole 143 can be changed as appropriate. For example, the inner diameter of the through hole 143 may be uniform over the entire second axis direction.

The movable portion 141 is formed in a screw shape. A male screw portion is formed on the shaft portion 141a of the movable portion 141. The shaft portion 141a is screwed into the small diameter portion 143b.
The head 141b of the movable portion 141 projects outward in the second radial direction from the tip portion of the shaft portion 141a in the second axis direction. The head 141b is formed in a polygonal shape when viewed from the front in the direction of the second axis. In the present embodiment, the maximum outer diameter portion of the head 141b is the same as the outer diameter portion of the fixed portion 140. However, the front view shape and outer diameter of the head 141b can be changed as appropriate.

As shown in FIG. 8, the movable portion 141 moves to the base end side in the second axis direction with respect to the fixed portion 140 and the bimetal piece 121 by rotating the movable portion 141 with respect to the fixed portion 140 in the tightening direction. As a result, the center of gravity of the weight portion 122 moves to the base end side in the second axis direction. On the other hand, as shown in FIG. 7, the movable portion 141 moves toward the tip end side in the second axis direction with respect to the fixed portion 140 and the bimetal piece 121 by rotating the movable portion 141 in the loosening direction with respect to the fixed portion 140. As a result, the center of gravity of the weight portion 122 moves toward the tip end side in the second axis direction.
As described above, the weight portion 122 of the present embodiment is configured so that the center of gravity of the weight portion 122 itself in the second axis direction can be adjusted as the movable portion 141 moves with respect to the fixed portion 140 and the bimetal piece 121 in the second axis direction. Has been done.

[Temperature correction method]
Next, in the above-mentioned balance with hairspring 54, a method for adjusting the temperature coefficient correction amount will be described. First, a temperature compensation method depending on the orientation of the bimetal piece 121 will be described. FIG. 9 is a partial plan view of the balance with hairspring 54 for explaining the operation of the adjusting unit 100.
In the state of FIG. 9, in the bimetal piece 121, the low expansion member 130 and the high expansion member 131 are arranged in the first radial direction with the low expansion member 130 located inside in the first radial direction.

In the balance with hairspring 54 of the present embodiment, when a temperature change occurs, the bimetal piece 121 is bent and deformed due to the difference in the coefficient of thermal expansion between the low expansion member 130 and the high expansion member 131. Specifically, when the temperature rises with respect to a predetermined temperature T0 (normal temperature (for example, about 23 ° C.)), the high expansion member 131 expands more than the low expansion member 130. As a result, the adjusting portion 100 is deformed to one side in the stacking direction of the low expansion member 130 and the high expansion member 131 (inside in the first radial direction in FIG. 9). When the temperature drops with respect to the predetermined temperature T0, the high expansion member 131 contracts more than the low expansion member 130. As a result, the adjusting portion 100 is deformed to the other side in the stacking direction (outside in the first radial direction in FIG. 9).

When the adjusting portion 100 is deformed, the distance between the tip portion of the adjusting portion 100 and the first axis O1 in the first radial direction changes. Specifically, the distance R0 between the tip of the adjusting unit 100 and the first axis O1 at a predetermined temperature T0 in the first radial direction is set, and the tip of the adjusting unit 100 and the first axis O1 when the temperature changes. 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 ΔR in the first radial direction. Then, the average diameter of the balance wheel 62 can be reduced or expanded according to the radius change amount ΔR, and the moment of inertia around the first axis O1 of the balance with hairspring 54 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. This makes it possible to correct the temperature coefficient of the moment of inertia.

By the way, when a thermoelastic material is used for the beard royal fern 63 as in the present embodiment, the temperature coefficient of Young's modulus varies positively or negatively depending on the processing conditions in the manufacturing process of the beard royal fern (for example, melting or heat treatment). there's a possibility that.

On the other hand, in the present embodiment, the direction of the bimetal piece 121 (rotation angle θ around the second axis O2) can be changed according to the temperature coefficient of Young's modulus of the hairspring 63. Specifically, the tool is locked in the locking portion 126 of the adjusting portion 100 shown in FIG. Then, by rotating the tool around the second axis O2, the adjusting portion 100 rotates around the second axis O2 while the outer peripheral surface of the holding portion 120 slides on the inner peripheral surface of the mounting hole 101. As a result, the rotation angle θ is changed.

10 to 14 are enlarged cross-sectional views showing the adjusting unit 100.
In the state shown in FIG. 10, the low expansion member 130 and the high expansion member 131 are arranged in the first axis direction with the low expansion member 130 located on the front side in the first axis direction. With this state as the reference position (0 (deg)) of the adjusting unit 100, the rotation angle θ around the second axis O2 is adjusted. For example, in FIG. 11, the adjusting unit 100 is rotated by 45 (deg) in the clockwise direction (+ direction) around the second axis O2 from the reference position. In FIG. 12, the adjusting unit 100 is rotated by 90 (deg) from the reference position in the clockwise direction (+ direction) around the second axis O2.
In FIG. 13, the adjusting unit 100 is rotated by −45 (deg) from the reference position in the counterclockwise direction (− direction) around the second axis O2. In FIG. 14, the adjusting unit 100 is rotated by −90 (deg) in the clockwise direction (− direction) around the second axis O2 from the reference position.

FIG. 15 shows the orientation of the bimetal piece 121 and the amount of deformation of the bimetal piece 121 when the rotation angle θ of the adjusting unit 100 is changed from −90 (deg) to 90 (deg) at the same temperature (at high temperature). It is a graph showing the relationship between and. In FIG. 15, the X-axis shows a component (hereinafter, referred to as an X component) along the first radial direction in the deformation vector of the bimetal piece 121. Further, the Y-axis shows a component (hereinafter, referred to as a Y component) along the first axis direction in the deformation vector of the bimetal piece 121. In this case, in FIG. 15, the −X direction coincides with the inside of the first radial direction, and the + X direction coincides with the outside of the first radial direction. Further, in FIG. 15, the bimetal piece 121 located at the origin shows a state of a predetermined temperature T0 (before deformation).

As shown in FIG. 15, when the adjusting unit 100 is in the reference position (0 (deg)), the bimetal piece 121 is deformed only on the front side in the first axis direction (A1 in FIG. 15). Therefore, at the reference position, the Y component is the maximum and the X component is 0 in the deformation vector of the bimetal piece 121. In this case, since the radius change amount ΔR is 0, the temperature coefficient of the moment of inertia does not change.

When the adjusting unit 100 is rotated in the + direction from the reference position, the bimetal piece 121 is also deformed to the outside in the first radial direction, so that the + X component of the deformation vector of the bimetal piece 121 is generated (in FIG. 15). A2, A3). Then, by increasing the rotation angle θ in the + direction, the + X component gradually increases. That is, by positioning the rotation angle θ of the adjusting unit 100 in the + direction from the reference position, the amount of increase in the moment of inertia of the balance with hairspring 54 when the temperature rises can be increased. Moreover, when the rotation angle θ is 90 (deg) (A3 in FIG. 15), the bimetal piece 121 is deformed only to the outside in the first radial direction. Therefore, when the rotation angle θ is 90 (deg), the + X component becomes the maximum and the Y component becomes 0. In this way, by rotating the adjusting unit 100 in the + direction from the reference position, the temperature coefficient of the moment of inertia can be increased.

On the other hand, when the adjusting unit 100 is rotated in the − direction from the reference position, the bimetal piece 121 is also deformed inward in the first radial direction, so that the −X component of the deformation vector of the bimetal piece 121 is generated ( A4 and A5) in FIG. Then, by increasing the rotation angle θ in the − direction, the −X component becomes larger. That is, by locating the rotation angle θ of the adjusting unit 100 in the − direction from the reference position, it is possible to suppress an increase in the moment of inertia of the balance with hairspring 54 when the temperature rises. Moreover, when the rotation angle θ is 90 (deg) (A5 in FIG. 15), the bimetal piece 121 is deformed only inside in the first radial direction. Therefore, when the rotation angle θ is 90 (deg), the −X component becomes the maximum and the Y component becomes 0. In this way, by rotating the adjusting unit 100 in the − direction from the reference position, the temperature coefficient of the moment of inertia can be reduced.

FIG. 16 is a graph showing the relationship between the rotation angle θ of the adjusting unit 100 and the radius change amount ΔR.
As shown in FIG. 16, from the result in FIG. 15 described above, when the adjusting unit 100 is rotated in the + direction from the reference position, the radius change amount ΔR of the adjusting unit 100 is in the + direction (outside the first radial direction). growing. On the other hand, when the adjusting unit 100 is rotated in the − direction from the reference position, the radius change amount ΔR of the adjusting unit 100 increases in the − direction (inside in the first radial direction).

FIG. 17 is a graph showing the relationship between the temperature (° C.) and the rate due to the difference in the temperature coefficient of the Young's modulus of the hairspring 63. In FIG. 17, the broken line G1 shows the case where the rate (vibration cycle of the balance with hairspring 54) has a negative temperature characteristic, and the chain line G2 shows the case where the rate has a positive temperature characteristic.
As shown in G1 of FIG. 17, due to the relationship between the Young's modulus of the hairspring 63 and the moment of inertia of the balance spring 54, when the rate has a negative temperature characteristic, the rate tends to be delayed as the temperature rises. In this case, the adjusting unit 100 is rotated in the − direction from the reference position. As a result, the amount of change in radius ΔR inward in the first radial direction due to the temperature rise can be secured, and the temperature coefficient of the moment of inertia can be reduced, so that the increase in the moment of inertia of the balance with the temperature rise can be suppressed. can. As a result, the temperature coefficient of the vibration cycle of the balance with hairspring 54 is adjusted toward zero, and the rate is kept constant regardless of the temperature change (see the solid line G3 in FIG. 17).
On the other hand, as shown in G2 of FIG. 17, when the rate has a positive temperature characteristic due to the relationship between the Young's modulus of the hairspring 63 and the moment of inertia of the balance with hairspring 54, the rate tends to increase as the temperature rises. It is in. In this case, the adjusting unit 100 is rotated in the + direction from the reference position. As a result, the amount of change in radius ΔR in the first radial direction due to the temperature rise can be secured and the temperature coefficient of the moment of inertia can be increased. You can make it bigger. As a result, the temperature coefficient of the vibration cycle of the balance with hairspring 54 is adjusted toward zero, and the rate is kept constant regardless of the temperature change (see the solid line G3 in FIG. 17).

Next, a temperature compensation method using the weight portion 122 will be described.
The weight portion 122 of the present embodiment is configured such that the movable portion 141 is movable in the second axis direction with respect to the fixed portion 140 and the bimetal piece 121. In this case, in order to reduce the temperature coefficient of the moment of inertia, the movable portion 141 is rotated in the tightening direction as shown in FIG. 7. Then, the movable portion 141 moves toward the base end side in the second axis direction with respect to the fixed portion 140 and the bimetal piece 121. That is, the length of the weight portion 122 in the second axis direction (the length of the portion protruding from the first bent portion 77) is reduced, so that the center of gravity of the adjusting portion 100 moves toward the base end side in the second axis direction. .. As a result, the temperature coefficient of the moment of inertia of the adjusting unit 100 can be reduced.

On the other hand, in order to increase the temperature coefficient of the moment of inertia, as shown in FIG. 8, the movable portion 141 is rotated in the loosening direction. Then, the movable portion 141 moves toward the tip end side in the second axis direction with respect to the fixed portion 140 and the bimetal piece 121. That is, as the length of the weight portion 122 in the second axis direction increases, the center of gravity of the adjusting portion 100 moves toward the tip end side in the second axis direction. As a result, the temperature coefficient of the moment of inertia of the adjusting unit 100 can be increased.

In the present embodiment, the balance with hairspring 54 is changed by changing the rotation angle θ of the adjusting portion 100 (direction of the bimetal piece 121) and the length of the weight portion 122 (position of the movable portion 141) according to the temperature characteristic of the moment of inertia. The temperature coefficient of the moment of inertia can be corrected to both positive and negative. As a result, the variation in the temperature coefficient of Young's modulus can be easily canceled by the temperature characteristic of the moment of inertia of the balance with hairspring 54.

As described above, according to the present embodiment, the adjusting portion 100 having the bimetal piece 121 is provided at a position of the balance wheel 62 that is rotationally symmetric.
According to this configuration, the bimetal piece 121 is deformed with the temperature change, so that the average diameter of the balance wheel 62 changes. Thereby, the temperature characteristic of the moment of inertia can be corrected.

Here, in the present embodiment, the adjusting portion 100 has a bimetal piece 121 and a weight portion 122 attached to the bimetal piece 121 so as to be movable in the second axis direction.
According to this configuration, the position of the center of gravity of the weight portion 122 in the second axis direction can be changed by adjusting the position of the weight portion 122 in the second axis direction with respect to the bimetal piece 121. As a result, the temperature coefficient of the moment of inertia of the balance with hairspring 54 can be continuously adjusted. As a result, the temperature coefficient correction amount can be adjusted easily and with high accuracy as compared with the conventional configuration in which another part such as a flickering screw is attached and detached.

In the present embodiment, since the adjusting portion 100 is provided on the rim portion 73 of the balance wheel 62, the adjusting portion 100 can be kept away from the first axis line O1 in the first radial direction. As a result, the radius deformation amount ΔR can be increased, and the temperature coefficient correction amount by the bimetal piece 121 can be increased.

In the present embodiment, the weight portion 122 is attached to the fixed portion 140 and the fixed portion 140 so as to be movable in the second axis direction.
According to this configuration, of the weight portion 122, only the movable portion 141 moves with respect to the fixed portion 140 and the bimetal piece 121, so that the effective length of the bimetal piece 121 accompanying the movement of the movable portion 141 (holding portion 120). And the length of the exposed part from the weight part 122) does not change. That is, since only the position of the center of gravity of the weight portion 122 can be changed (the amount of deformation of the bimetal piece 121 with respect to the temperature change does not change), the temperature coefficient correction amount can be adjusted more easily.

In the present embodiment, the bimetal piece 121 is cantileveredly extended from the rim portion 73, and the weight portion 122 is attached to the tip portion of the bimetal piece 121.
According to this configuration, since the adjusting portion 100 is cantilevered and extended, the radius deformation amount ΔR due to the temperature change can be secured, and the temperature coefficient correction amount by the bimetal piece 121 can be increased.
Moreover, since the weight portion 122 is attached to the tip portion of the bimetal piece 121, the weight of the tip portion, which is the maximum deformed portion of the adjusting portion 100, can be increased. Therefore, the amount of temperature coefficient correction by the bimetal piece 121 can be increased. Further, by attaching the weight portion 122 to the tip portion of the bimetal piece 121, the base end portion of the adjusting portion 100 can be stably held by the rim portion 73. As a result, it is possible to suppress rattling and the like of the entire adjusting portion 100 due to the adjustment of the weight portion 122, and it is possible to adjust the temperature coefficient correction amount with higher accuracy.

In the present embodiment, the adjusting unit 100 is configured so that the position can be adjusted around the second axis O2.
According to this configuration, the orientation of the bimetal piece 121 can be changed according to the temperature coefficient of Young's modulus in the hairspring 63. As a result, the temperature coefficient correction amount of the bimetal piece 121 can be changed to both positive and negative, and the temperature coefficient of the moment of inertia of the balance with hairspring 54 can be corrected to both positive and negative. That is, the variation in the temperature coefficient of Young's modulus can be easily canceled by the temperature characteristic of the moment of inertia of the balance with hairspring 54. In particular, as in the present embodiment, the temperature coefficient correction amount can be adjusted with higher accuracy by adjusting the moment of inertia of the balance with hairspring 54 at the rotation angle θ of the adjusting unit 100 in addition to the position of the weight portion 122. As a result, the vibration cycle of the balance with hairspring 54 can be kept constant, and the balance with hairspring 54 having excellent temperature compensation characteristics can be provided.
Moreover, in the present embodiment, even if the orientation of the bimetal piece 121 is changed, the length of the adjusting unit 100 in the second axis O2 direction is maintained constant. Therefore, unlike the case where the effective length of the bimetal piece 121 is changed as in the conventional case, the center of gravity of the balance with hairspring 54 can be prevented from shifting at a predetermined temperature T0. As a result, the occurrence of one-sided weight can be suppressed and the posture difference can be reduced.

In the present embodiment, the adjusting portion 100 is arranged inside the rim portion 73 in the first radial direction and extends along the tangent line of the rim portion 73.
According to this configuration, it is possible to secure the radius deformation amount ΔR due to the temperature change while suppressing the increase in size of the balance with hairspring 54 due to the addition of the adjusting unit 100.

In the present embodiment, since the locking portion 126 is formed at the base end portion (holding portion 120) of the adjusting portion 100, it is easy to adjust the position of the adjusting portion 100 around the second axis O2 via the holding portion 120. Can be done. Moreover, by changing the rotation angle θ of the adjusting portion 100 via the holding portion 120, the adjustment is made as compared with the case where the rotation angle θ of the adjusting portion 100 is changed via the tip portion (bimetal piece 121 or weight portion 122). It is possible to suppress the plastic deformation of the adjusting portion 100 at the time of adjusting the position of the portion 100. Therefore, it is possible to suppress the variation in the rate at the predetermined temperature T0 due to the plastic deformation of the adjusting unit 100.

In the present embodiment, the hairspring 63 is made of a constant elastic material.
According to this configuration, the change in Young's modulus due to the temperature change can be reduced, and the temperature dependence of the vibration cycle can be suppressed. Moreover, in the present embodiment, since the variation in the temperature coefficient of Young's modulus can be corrected by the adjusting unit 100, the manufacturing control at the time of manufacturing the hairspring 63 becomes easy. Therefore, it is possible to improve the manufacturing efficiency of the hairspring 63 and reduce the cost.

In the present embodiment, since the center of gravity of the adjusting unit 100 is located on the second axis O2, the center of gravity of the adjusting unit 100 is second depending on the rotation angle θ of the adjusting unit 100 and the position of the weight unit 122 in the second axis direction. It is possible to suppress the deviation from the axis O2. As a result, the temperature coefficient correction amount can be adjusted with higher accuracy.

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 a high-quality movement 2 and the timepiece 1 with little variation in the rate.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 18 is a perspective view of the adjusting unit 100 according to the second embodiment. FIG. 19 is a cross-sectional view taken along the line XIX-XIX of FIG.
As shown in FIGS. 18 and 19, the adjusting portion 100 of the present embodiment is different from the above-described first embodiment in that the weight portion 122 is configured by being directly screwed to the bimetal piece 121. ..

A male screw portion is formed on the outer peripheral surface of the tip portion of the bimetal piece 121.
The weight portion 122 is formed in a tubular shape coaxially arranged with the second axis O2. A female screw portion is formed on the inner peripheral surface of the weight portion 122. As a result, the weight portion 122 is screwed to the tip end portion of the bimetal piece 121.

In the present embodiment, by rotating the weight portion 122 with respect to the bimetal piece 121 in the tightening direction, the weight portion 122 moves to the base end side in the second axis direction with respect to the bimetal piece 121. As a result, the center of gravity of the adjusting unit 100 moves to the base end side in the second axis direction. On the other hand, by rotating the weight portion 122 in the loosening direction with respect to the bimetal piece 121, the weight portion 122 moves toward the tip end side in the second axis direction with respect to the bimetal piece 121.

In this embodiment, in addition to exhibiting the same effects as those of the above-described embodiment, for example, the following effects are exhibited.
That is, according to the present embodiment, the effective length of the bimetal piece 121 changes as the weight portion 122 moves. This makes it possible to increase the amount of change in the moment of inertia of the balance with respect to the amount of adjustment of the weight portion 122 in the direction of the second axis.

(Third Embodiment)
Next, a third embodiment of the present invention will be described. FIG. 20 is a perspective view of the adjusting unit 100 according to the third embodiment. FIG. 21 is a cross-sectional view taken along the line XXI-XXI of FIG.
As shown in FIGS. 20 and 21, in the present embodiment, the weight portion 122 includes a tubular portion 200 and a weight main body 201.

The tubular portion 200 is arranged coaxially with the second axis line O2. The tubular portion 200 is formed with a slit 202 that opens at the base end surface in the second axis direction. The slit 202 extends in the second axis direction and is terminated at an intermediate portion in the tubular portion 200. In the present embodiment, the slits 202 are formed in pairs on the portions of the tubular portion 200 facing each other in the second radial direction. The portion of the tubular portion 200 located between the slits 202 in the second circumferential direction is configured to be flexible and deformable in the second radial direction. The position, number, dimensions, etc. of the slits 202 can be changed as appropriate.

The weight body 201 is fixed to the tip portion in the tubular portion 200. The size and the like of the weight body 201 can be changed as appropriate.

In the present embodiment, the bimetal piece 121 is press-fitted (elastically held) from the opening on the proximal end side of the tubular portion 200. The tightening allowance between the bimetal piece 121 and the cylinder portion 200 is set so that the weight portion 122 can move in the second axis direction when an external force is applied to the cylinder portion 200 in the second axis direction. There is.
In the present embodiment, the position of the center of gravity of the weight portion 122 in the second axis direction can be changed by sliding the weight portion 122 with respect to the bimetal piece 121 in the second axis direction. That is, by moving the weight portion 122 toward the tip end side in the second axis direction with respect to the bimetal piece 121, the center of gravity of the weight portion 122 moves toward the tip end side in the second axis direction. On the other hand, by moving the weight portion 122 toward the proximal end side in the second axis direction with respect to the bimetal piece 121, the center of gravity of the weight portion 122 moves toward the proximal end side in the second axis direction.

In this embodiment, in addition to exhibiting the same effects as those of the second embodiment described above, for example, the following effects are exhibited.
That is, the weight portion 122 can be movably attached to the bimetal piece 121 in the second axis direction without any special processing on the bimetal piece 121. As a result, it is possible to suppress a decrease in manufacturing efficiency and an increase in manufacturing cost due to the addition of the weight portion 122.

(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 embodiment, a configuration in which two adjusting portions 100 are provided at positions of the rim portion 73 that are rotationally symmetrical has been described, but the configuration is not limited to this configuration. That is, as long as each adjusting unit 100 is provided at a position that is rotationally symmetric, three or more adjusting units 100 may be provided, for example, as shown in FIG.

The adjusting unit 100 may adjust the position around the second axis O2 and then fix the adjusting unit 100 to the first bent portion 77 so as not to rotate. The method of fixing the adjusting portion 100 may be welding, adhesion, or the like, or may be fixed by using a separate fastening member (for example, a set screw or the like).

In the above-described embodiment, the configuration in which the moment of inertia of the balance with hairspring 54 is adjusted by the rotation angle θ of the bimetal piece 121 and the position of the weight portion 122 in the second axis direction has been described, but the configuration is not limited to this configuration. The adjusting portion 100 may be configured such that at least the weight portion 122 is movable in the second axis direction with respect to the bimetal piece 121.
In the above-described embodiment, the configuration in which the weight portion 122 is attached to the tip end portion of the bimetal piece 121 has been described, but any configuration in the bimetal piece 121 as long as it can move in the second axis direction with respect to the bimetal piece 121. It can be installed in the position of.

In the above-described embodiment, the configuration in which the adjusting portion 100 is arranged on the same plane as the rim portion 73 has been described, but the configuration is not limited to this configuration. That is, the adjusting portion 100 and the rim portion 73 may be arranged at positions deviated from each other in the first axis direction.
In the above-described embodiment, the configuration in which the second axis O2 of the adjusting portion 100 extends along the tangent line of the rim portion 73 has been described, but the configuration is not limited to this configuration. That is, any configuration may be used as long as the X component is generated in the deformation vector of the adjusting unit 100 by the deformation of the bimetal piece 121 due to the temperature change. In this case, the second axis O2 can be set in a direction intersecting the first axis direction, a direction parallel to the first axis direction, and the like.

In the above-described embodiment, the configuration in which the adjusting portion 100 is supported by the rim portion 73 via the supporting portion 110 has been described, but the configuration is not limited to this configuration. That is, it suffices if the adjusting portion 100 is provided in the portion (temple main body) of the balance sheet 54 that is rotated by the power of the hairspring 63. In this case, examples of the balance sheet include a balance sheet 61, a balance wheel 62 (hub portion 71, amida portion 72, etc.), a swing seat 67, and the like.

In the above-described embodiment, the case where the low expansion member 130 and the high expansion member 131 are formed of plate materials having the same shape has been described, but the present invention is not limited to this configuration. For example, as shown in FIG. 23, the thicknesses of the low expansion member 130 and the high expansion member 131 may be different from each other. Further, the cross-sectional shape of the low expansion member 130 and the high expansion member 131 orthogonal to the second axis O2 is not limited to a rectangular shape, but can be appropriately changed such as a triangular shape or a semicircular shape.

In the above-described embodiment, the configuration in which the low expansion member 130 and the high expansion member 131 are laminated in the second radial direction has been described, but the configuration is not limited to this configuration, and the low expansion member 130 and the high expansion member 131 are laminated in a direction intersecting the second axis direction. In this case, for example, as shown in FIG. 23, a low expansion member 130 that gradually becomes thicker toward the tip side and a high expansion member 131 that gradually becomes thinner toward the tip side may be laminated. ..
In the above-described embodiment, the configuration in which the adjusting unit 100 extends linearly has been described, but the configuration is not limited to this configuration. The adjusting unit 100 may intersect and extend in the direction of the second axis line or may be formed into a waveform as long as the position can be adjusted around the second axis line O2.

In the above-described embodiment, the configuration in which the adjusting unit 100 is cantilevered and extended has been described, but the configuration is not limited to this configuration, and a two-sided configuration may be used.
In the above-described embodiment, the case where the bimetal piece 121 is formed over the entire area between the support portion 110 and the weight portion 122 in the adjusting portion 100 has been described, but the present invention is not limited to this configuration. It suffices that at least a part of the adjusting unit 100 is composed of the bimetal piece 121.

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

1 ... Clock 2 ... Movement 54 ... Temp 61 ... Temp Shin (temple body)
62 ... Temple (temple body)
63 ... Hairspring 73 ... Rim part 100 ... Adjustment part 121 ... Bimetal piece 122 ... Weight part 140 ... Fixed part 141 ... Movable part

Claims (9)

A balance sheet that has a balance extending along the first axis and is rotated around the first axis by the power of the whiskers.
Materials having different coefficients of thermal expansion intersect the second axis line, extending linearly along the second axis line perpendicular to the first axis line from positions that are rotationally symmetric around the first axis line in the balance sheet body. A temperature-compensated balance with a bimetal piece laminated in the direction of the element, and an adjusting portion having a weight portion attached to the bimetal piece so as to be movable in the direction of the second axis along the second axis. A balance sheet that has a balance extending along the first axis and is rotated around the first axis by the power of the whiskers.
A bimetal piece extending along the second axis from a position that is rotationally symmetric around the first axis in the balance body, and laminated in a direction in which materials having different coefficients of thermal expansion intersect the second axis. It is provided with an adjusting portion having a weight portion attached to the bimetal piece so as to be movable in the direction of the second axis along the second axis.
The weight portion is
The fixed part fixed to the bimetal piece and
A temperature -compensated balance with a movable portion that is movably attached to the fixed portion in the direction of the second axis. A balance sheet that has a balance extending along the first axis and is rotated around the first axis by the power of the whiskers.
A bimetal piece extending along the second axis from a position that is rotationally symmetric around the first axis in the balance body, and laminated in a direction in which materials having different coefficients of thermal expansion intersect the second axis. It is provided with an adjusting portion having a weight portion attached to the bimetal piece so as to be movable in the direction of the second axis along the second axis.
The adjusting unit is a temperature -compensated balance that is supported by the balance body so that its position can be adjusted around the second axis. The main body of the balance
With the above-mentioned Tenshin
It has a rim portion that surrounds the balance with respect to the balance from the outside in the first radial direction orthogonal to the first axis, and includes a balance wheel attached to the balance.
The temperature-compensated balance according to any one of claims 1 to 3 , wherein the adjusting portion extends from the rim portion. The bimetal piece is cantilevered and extended from the balance body.
The temperature-compensated balance according to any one of claims 1 to 4 , wherein the weight portion is attached to the tip end portion of the bimetal piece. The temperature-compensated balance sheet according to any one of claims 1 to 5, wherein the hairspring is made of a thermoelastic material. The temperature-compensated balance according to any one of claims 1 to 6, wherein the center of gravity of the bimetal piece is located on the second axis. 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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