JP5953629B2 - Temperature compensated balance, watch movement and mechanical watch - Google Patents

Description

  The present invention relates to a temperature-compensated balance, a timepiece movement including the same, and a mechanical timepiece.

A governor of a mechanical timepiece is generally composed of a balance with a balance and a hairspring. Of these, the balance with a balance that rotates about the axis and a balance wheel that is fixed to the balance via an arm portion, and is a member that periodically rotates in the forward and reverse directions to vibrate. The hairspring is a member that transmits power for rotating the balance wheel forward and backward at a constant cycle.
Incidentally, since the balance of the balance with the balance is a factor that determines the rate of the timepiece, it is important that the balance is set within a predetermined value. If the vibration period deviates from the specified value, the rate of the mechanical timepiece (timepiece delay, degree of advance) changes as described above. However, the vibration cycle is likely to change due to various causes, and for example, changes due to temperature changes.
Here, the vibration period T is expressed by the following equation (1).

In the above formula (1), I represents “the moment of inertia of the balance”, and K represents “the spring constant of the hairspring”. Therefore, when the moment of inertia of the balance or the spring constant of the hairspring changes, the vibration period also changes.
Specifically, if the spring constant of the hairspring is increased, the vibration cycle of the balance with hairspring is shortened, and if the spring constant of the hairspring is decreased, the vibration cycle of the balance with hairspring is increased. In other words, if the spring constant of the balance spring is increased, the phase of the balance spring is advanced, and if the spring constant of the balance spring is decreased, the phase of the balance spring is delayed.
On the other hand, when the moment of inertia of the balance is increased, the vibration cycle of the balance is lengthened and the phase is delayed. Further, if the moment of inertia of the balance with hairspring becomes small, the vibration cycle of the balance with hairspring becomes short and the phase advances.

  Here, the metal material used for the balance with hairspring is generally a material having a positive coefficient of linear expansion, and expands as the temperature rises. As a result, the balance wheel expands in diameter and increases the moment of inertia. Moreover, since the Young's modulus of the steel material generally used for the hairspring has a negative temperature coefficient, the spring constant is lowered by the temperature rise.

  As described above, when the temperature of the surrounding environment rises, the moment of inertia increases and the spring constant of the balance spring decreases. Therefore, as apparent from the above formula (1), the vibration period of the balance with hairspring becomes a characteristic that is short at a low temperature and long at a high temperature. For this reason, the time characteristic of the timepiece is such that it proceeds at a low temperature and is delayed at a high temperature.

  Therefore, a method for adjusting the temperature characteristic of the moment of inertia of the balance in order to correct the temperature characteristic of the balance and improve the temperature dependency of the vibration cycle of the balance is known. As one of the methods, a balance with an arm portion that connects the balance and the balance wheel made of a material having a thermal expansion coefficient different from that of the balance wheel is known (see Non-Patent Document 1).

  This balance is an Ovalising Balance type bimetal balance, and as shown in FIG. 13, the balance wheel 100 is formed of a material having a small thermal expansion coefficient (for example, nickel steel), and the arm portion 110 is thermally expanded. It is made of a material (for example, brass) larger than the coefficient. The balance wheel 100 is attached with a plurality of chill screws 120 serving as a weight portion around a position facing the radial direction across the arm portion 110.

Therefore, when the temperature rises, as shown in FIG. 14, the arm part 110 having a high thermal expansion coefficient deforms the balance wheel 100 outward in the radial direction by its deformation, so that the balance wheel 100 has its long axis at the arm part 110. It is deformed into an ellipse so as to coincide with the extending direction of. In FIG. 14, the illustration of the plurality of chill screws 120 is omitted.
Thereby, the chill screw 120 fixed to the short axis direction side of the balance wheel 100 can be moved inward in the radial direction. Accordingly, the moment of inertia of the balance wheel 100 can be reduced, and the temperature characteristic of the moment of inertia can be given a negative slope. As a result, the temperature dependency of the vibration period of the balance with hairspring can be kept low.

Hans Jendritzki, “Watch Adjustment”, 2006 reprint (first edition in 1970), p10

However, even with the conventional method described above, it is necessary to finely adjust the rate of change of the moment of inertia accompanying the temperature change, and in practice, the mounting positions of the plurality of chill screws 120 mounted on the balance wheel 100 are changed. Work is needed. However, since these chiller screws 120 are attached to screw holes (not shown) formed at equal intervals in the circumferential direction with respect to the balance wheel 100, the attachment positions of the chiller screws 120 are limited by the screw holes.
Therefore, the rate of change of the moment of inertia can be adjusted only in stages, and the adjustment accuracy has a limit. Furthermore, since the operation | work etc. which replace | exchange the chiller screw 120 to each screw hole are needed, it took time and effort, and workability | operativity was bad.

  The present invention has been made in view of such circumstances, and its purpose is to easily and steplessly adjust the rate of change of the moment of inertia accompanying a change in temperature, and to adjust the accuracy of the temperature correction of the moment of inertia. It is to provide a temperature compensated balance with improved temperature compensation performance, a timepiece movement and a mechanical timepiece having the same.

The present invention provides the following means in order to solve the above problems.
(1) A temperature-compensated balance according to the present invention is attached to the balance with a balance that rotates about the axis and an arm that extends along the radial direction of the balance. An annular balance wheel having a coefficient of thermal expansion different from the expansion coefficient, a plurality of weight portions provided on the balance wheel at intervals in the circumferential direction of the balance, and the plurality of weight portions simultaneously with the arm and a control mechanism for the relatively movable in distichum direction previously for parts, the plurality of parts, in a state in which mutual relative position is fixed in the circumferential direction, provided on the balance wheel and said that you are.

  According to the temperature-compensated balance according to the present invention, when a temperature change occurs, the annular balance wheel is elliptical due to the difference in thermal expansion coefficient between the arm portion and the balance wheel, more specifically along the extending direction of the arm portion. And deformed into an ellipse so that the major axis or minor axis is oriented. Thereby, the weight part provided in the balance wheel can be moved toward the inside or outside in the radial direction, and the position can be changed in the radial direction. Therefore, the moment of inertia of the entire balance can be changed, and the temperature correction can be performed by changing the gradient of the temperature characteristic of the moment of inertia.

  At this time, since the position of the weight portion relative to the arm portion can be moved in the circumferential direction by the adjustment mechanism, it is possible to adjust the amount of change in the weight portion whose position changes in the radial direction as the balance wheel is deformed. It is. Thereby, the rate of change of the inertia moment with respect to the temperature change can be adjusted, and the temperature correction can be performed precisely.

In particular, unlike the conventional method using a chill screw, the arm portion and the weight portion can be freely moved relative to each other in the circumferential direction, so that the amount of change in the radial direction of the weight portion can be continuously and continuously. Can be adjusted. As a result, the rate of change of the inertia moment with respect to the temperature change can also be adjusted steplessly and continuously, and the adjustment accuracy of the inertia moment can be improved. Therefore, the temperature dependence of the vibration frequency of the balance with hairspring can be suppressed, and the balance with excellent temperature compensation performance can be obtained in which the rate is difficult to change due to temperature change.
In addition, it is not necessary to replace the flicker screw as in the prior art, and the temperature correction operation for the moment of inertia can be performed continuously.

(2) In the temperature compensated balance according to the present invention, it is preferable that the arm portion has a larger coefficient of thermal expansion than the balance wheel.

  In this case, when the temperature rises, the arm portion deforms the balance wheel outward in the radial direction, so that the balance wheel can be deformed into an elliptical shape so that the long axis is directed in the extending direction of the arm portion. Therefore, the weight part can be easily moved inward in the radial direction, and can be adjusted in a direction to reduce the moment of inertia. Therefore, it can be used in combination with a general balance spring whose spring constant decreases with increasing temperature, and it is easy to improve versatility as a balance.

(3) In the temperature-compensated balance according to the present invention, the adjustment mechanism may include a convex portion provided on one of the arm portion and the balance wheel, and the other of the arm portion and the balance wheel. A concave portion extending along the circumferential direction, and the convex portion is movably engaged with the concave portion, whereby the arm portion and the weight portion are relatively moved in the circumferential direction. It is preferable to enable this.

  In this case, since the arm portion and the balance wheel are connected to each other so as to be relatively movable in the circumferential direction via the convex portion and the concave portion, it is possible to perform a simple operation simply by relatively moving the arm portion and the balance wheel in the circumferential direction. The arm portion and the weight portion can be relatively moved in the circumferential direction. Therefore, it is possible to easily perform the temperature correction operation of the moment of inertia and to easily improve the adjustment accuracy. Further, since the adjustment mechanism can be configured by the convex portion and the concave portion, the configuration can be easily simplified.

( 4 ) In the temperature compensated balance according to the present invention, the balance wheel is provided with a first balance wheel attached to the arm portion and the weight portion, and is relatively rotatable with respect to the first balance wheel. A second balance wheel attached to the first balance wheel, and the adjusting mechanism relatively rotates the first balance wheel and the second balance wheel, thereby causing the arm portion and the weight portion to move in the circumferential direction. It is preferable to enable relative movement.

In this case, the arm portion and the weight portion can be relatively moved in the circumferential direction by a simple operation of simply rotating the first balance wheel and the second balance wheel. Therefore, it is possible to easily perform the temperature correction operation of the moment of inertia and to easily improve the adjustment accuracy.
In particular, since it is possible to integrally connect the first balance wheel and the arm portion, rattling or the like hardly occurs at the connection portion between the first balance wheel and the arm portion. Therefore, the balance wheel composed of the first balance wheel and the second balance wheel and the balance wheel can be accurately arranged on the same axis, and the rotation balance can be further improved.

( 5 ) In the temperature compensation balance according to the present invention, the first balance wheel is disposed radially outside the second balance wheel, and extends along the circumferential direction of the first balance wheel. It is preferable that a concave portion is formed and the weight portion is a screw member that is fixed to the second balance wheel through the concave portion from outside in the radial direction of the first balance wheel.

In this case, the weight portion fixed to the second balance wheel can be moved in the circumferential direction by relatively rotating the first balance wheel and the second balance wheel, thereby the weight portion and the arm portion. Can be moved relative to each other in the circumferential direction.
In particular, the weight portion is a screw member that is fixed to the second balance wheel through the recess from the outside in the radial direction of the first balance wheel. It can be easily regulated and released. Therefore, temperature correction can be easily performed in this respect.

( 6 ) In the temperature compensated balance according to the present invention, the first balance wheel is disposed radially inward of the second balance wheel, and the weight portion is fixed to the second balance wheel. In addition, it is preferable that the first balance wheel is a screw member that presses the first balance wheel from the outside in the radial direction.

In this case, the weight portion fixed to the second balance wheel can be moved in the circumferential direction by relatively rotating the first balance wheel and the second balance wheel, thereby the weight portion and the arm portion. Can be moved relative to each other in the circumferential direction.
In particular, since the weight portion is a screw member that presses the first balance wheel located radially inward of the second balance wheel from the outside in the radial direction, the pressing force due to the tightening can be changed. The relative rotation between the first balance wheel and the second balance wheel can be easily regulated and released. Therefore, temperature correction can be easily performed in this respect.

( 7 ) The temperature-compensated balance according to the present invention includes a balance spring that transmits power to the balance wheel to rotate the balance wheel with a constant vibration cycle. The balance spring has a spring constant. Is preferably made of a material that decreases with increasing temperature.

In this case, a balance spring made of a general material whose spring constant becomes smaller as the temperature rises can be used, so that the cost can be easily reduced.
Since the balance spring acts so that the vibration period of the balance increases as the temperature rises, it interacts with the action that reduces the vibration period of the balance by reducing the moment of inertia accompanying the rise in temperature. It becomes possible to maintain the vibration cycle of the balance with respect to the change.

( 8 ) A timepiece movement according to the present invention includes a barrel wheel having a power source, a wheel train for transmitting the rotational force of the barrel wheel, an escape mechanism for controlling the rotation of the wheel train, and the escape mechanism. And a temperature-compensated balance according to the present invention.

  According to the timepiece movement according to the present invention, as described above, since the balance with high temperature compensation performance is improved and the inertia moment adjustment accuracy is improved, a high-quality timepiece movement with less error in the yield rate is provided. can do.

( 9 ) A mechanical timepiece according to the present invention includes the timepiece movement according to the present invention.

  According to the mechanical timepiece of the present invention, since the timepiece movement according to the present invention is provided, a high-quality mechanical timepiece with less error in rate can be obtained.

  According to the present invention, the rate of change of the moment of inertia accompanying the temperature change can be easily and continuously adjusted, the adjustment accuracy of the moment of inertia is improved, and the temperature compensation type balance with improved temperature compensation performance. Can be obtained.

It is a figure which shows 1st Embodiment which concerns on this invention, Comprising: It is a block diagram of the movement of a mechanical timepiece. It is a top view of the balance with the movement shown in FIG. It is DD sectional drawing shown in FIG. It is a top view which shows the state which removed the hairspring from the state shown in FIG. It is a perspective view of the balance with hairspring shown in FIG. FIG. 5 is a top view showing a state where the balance shown in FIG. 4 is deformed by a temperature change. It is a figure which shows 2nd Embodiment which concerns on this invention, Comprising: It is a perspective view of a balance with a balance. It is a perspective view of the engagement piece shown in FIG. It is a figure which shows 3rd Embodiment which concerns on this invention, Comprising: It is a perspective view of a balance with a balance. It is a figure which shows 4th Embodiment which concerns on this invention, Comprising: It is a perspective view of a balance with a balance. It is a fragmentary sectional view of the balance with a balance shown in FIG. It is EE sectional drawing shown in FIG. It is a top view which shows an example of the conventional balance (Ovalising Balance type). It is a figure which shows the state which the balance shown in FIG. 13 deform | transformed by the temperature rise.

<First Embodiment>
Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the mechanical timepiece 1 of the present embodiment is, for example, a wristwatch, and includes a movement (timepiece movement) 10 and a casing (not shown) that houses the movement 10.

(Composition of movement)
This movement 10 has a base plate 11 constituting a substrate. A dial (not shown) is arranged on the back side of the main plate 11. A train wheel incorporated on the front side of the movement 10 is referred to as a front train wheel, and a train wheel incorporated on the back side of the movement 10 is referred to as a back train wheel.
A winding stem guide hole 11a is formed in the base plate 11, and a winding stem 12 is rotatably incorporated therein. The winding stem 12 is positioned in the axial direction by a switching device having a setting lever 13, a yoke 14, a yoke spring 15 and a back presser 16. In addition, a chichi wheel 17 is rotatably provided on the guide shaft portion of the winding stem 12.

  Under such a configuration, the winding stem 12 is rotated in a state where the winding stem 12 is in the first winding stem position (0th stage) closest to the inside of the movement 10 along the rotation axis direction. Then, the hour wheel 17 rotates through the rotation of the spell wheel (not shown). And when this chi-wheel 17 rotates, the round hole wheel 20 which meshes with this rotates. And when this round hole wheel 20 rotates, the square wheel 21 which meshes with this rotates. Further, when the square hole wheel 21 rotates, the mainspring (power source) (not shown) housed in the barrel complete 22 is wound up.

  The front wheel train of the movement 10 includes a second wheel 25, a third wheel 26 and a fourth wheel 27 in addition to the barrel wheel 22, and functions to transmit the rotational force of the barrel wheel 22. Further, an escapement mechanism 30 and a speed adjusting mechanism 31 for controlling the rotation of the front wheel train are arranged on the front side of the movement 10.

The center wheel 25 is a gear that meshes with the barrel complete 22. The third wheel 26 is a gear that meshes with the second wheel 25. The fourth wheel 27 is a gear that meshes with the third wheel 26.
The escapement mechanism 30 is a mechanism for controlling the rotation of the above-described front wheel train, and an escape wheel 35 that meshes with the fourth wheel 27 and an ankle 36 that causes the escape wheel 35 to escape and rotate regularly. And.
The speed control mechanism 31 is a mechanism for controlling the escapement mechanism 30 and includes a balance (temperature compensation type balance) 40 as shown in FIGS.

(Structure of balance)
The balance with hairspring 40 includes a balance stem 50 that rotates about an axis O, a balance wheel 52 attached to the balance stem 50 via an arm 51, and a hairspring (balance spring) 41. The power transmitted from the mainspring 41 is a member that can be rotated forward and backward around the axis O with a constant vibration cycle.
In the present embodiment, a direction orthogonal to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

The balance stem 50 is a rotating shaft body extending vertically along the axis O, and the upper end portion and the lower end portion thereof are pivotally supported by members (not shown) such as a base plate and a balance holder that constitute the movement 10 described above.
A substantially intermediate portion in the vertical direction of the balance 50 is a large diameter portion 50a having the largest diameter. Further, in the balance stem 50, a cylindrical swing seat 53 is externally provided coaxially with the axis O at a portion located below the large diameter portion 50a. The swing seat 53 has an annular flange 53a projecting outward in the radial direction, and a swing stone 54 for swinging the ankle 36 is fixed to the flange 53a. .

The hairspring 41 is, for example, a flat whiskers wound spirally in one plane, and the inner end portion thereof is fixed to a portion located above the large diameter portion 50a of the balance stem 50 via a whisker ball (not shown). Has been. The balance spring 41 plays a role of storing the power transmitted from the fourth wheel 27 to the escape wheel 35 and transmitting the power to the balance wheel 52 as described above.
The hairspring 41 of the present embodiment is formed of a general steel material having a negative temperature coefficient of Young's modulus, and has a characteristic that the spring constant decreases as the temperature rises.

  As shown in FIGS. 3 to 5, the balance wheel 52 is formed in an annular shape surrounding the balance stem 50 from the outside in the radial direction, and the arm portion 51 is arranged coaxially with the balance stem 50. It is attached to the stem 50 via

The arm portion 51 is a belt-like plate member extending along the radial direction, and a fitting hole 51a fitted to the large diameter portion 50a of the balance stem 50 is formed at the central portion in the radial direction. As a result, the arm portion 51 is fixed to the balance stem 50 and can be rotated together with the balance stem 50.
Opposite wall portions 51b that face the inner peripheral surface of the balance wheel 52 are provided upright at both ends in the radial direction of the arm portion 51, respectively. These opposing wall portions 51 b are opposed to the balance wheel 52 with a minute gap therebetween, and are formed in a circular arc shape in plan view that follows the curvature of the balance wheel 52. Each opposing wall 51b is formed with a screw hole 51c, and a connecting screw 56 is screwed into the screw hole 51c with the balance wheel 52 sandwiched from outside in the radial direction of the balance wheel 52.

  Further, the balance wheel 52 is formed with an elongated hole-like recess 60 extending along the circumferential direction so as to face the radial direction across the balance 50. The connecting screw 56 is screwed into the screw hole 51c while being inserted through the recess 60. Therefore, the connection screw 56 in this embodiment functions as a convex portion that is provided on the arm portion 51 and engages with the concave portion 60 so as to be movable in the circumferential direction. Further, by loosening the connection screw 56, the arm portion 51 and the balance wheel 52 can be relatively moved in the circumferential direction.

By the way, the arm part 51 and the balance wheel 52 described above are formed of materials having different coefficients of thermal expansion.
In the present embodiment, the balance wheel 52 is formed of a low thermal expansion material such as invar, and the arm portion 51 is formed of a high thermal expansion material such as brass having a thermal expansion coefficient larger than that of the balance wheel 52. However, the present invention is not limited to the materials described above, and various materials may be appropriately selected and used. At this time, it is preferable to select materials for the arm portion 51 and the balance wheel 52 so that a large difference in the coefficient of thermal expansion occurs as much as possible.

A pair of weight screws 61 functioning as weight parts are screwed onto the outer peripheral surface side of the balance wheel 52. At this time, the weight screw 61 is fixed so as to face in the radial direction with the balance 50 interposed therebetween. As described above, the arm portion 51 and the balance wheel 52 are relatively moved in the circumferential direction, so that the arm portion 51 and the weight screw 61 can be relatively moved in the circumferential direction.
Therefore, the concave portion 60 and the connecting screw 56 described above function as an adjustment mechanism 65 that allows the arm portion 51 and the weight screw 61 to move relative to each other in the circumferential direction.

(Inertia moment temperature correction method)
Next, a method for correcting the temperature of the moment of inertia using the balance 40 will be described.
According to the balance 40 of the present embodiment, when a temperature change occurs, the annular balance wheel 52 is elliptical due to the difference in thermal expansion coefficient between the arm portion 51 and the balance wheel 52, more specifically, the extending direction of the arm portion 51. It is deformed into an ellipse shape so that the major axis or minor axis faces along. Accordingly, the pair of weight screws 61 fixed to the balance wheel 52 can be moved inward or outward in the radial direction, and the position thereof can be changed in the radial direction. Therefore, the moment of inertia of the balance with hairspring 40 can be changed, and the temperature correction can be performed by changing the gradient of the temperature characteristic of the moment of inertia.

  At this time, the position of the weight screw 61 relative to the arm portion 51 is moved in the circumferential direction by loosening the connecting screw 56 constituting the adjusting mechanism 65 and relatively moving the arm portion 51 and the balance wheel 52 in the circumferential direction. Therefore, it is possible to adjust the amount of change of the weight screw 61 whose position changes in the radial direction as the balance wheel 52 is deformed. Thereby, the rate of change of the inertia moment with respect to the temperature change can be adjusted, and the temperature correction can be performed precisely.

The above point will be described in more detail.
First, as an initial position of the weight screw 61, for example, as shown in FIG. And the case where the balance wheel 52 is deformed into an elliptical shape (shown in phantom line B) with the minor axis facing the extending direction of the arm portion 51 (shown in phantom line B), Let the intersecting part be the initial position.

  In FIG. 6, the deformation of the balance wheel 52 is highlighted. Therefore, in the illustrated example, the angle θ formed by the straight line along the extending direction of the arm portion 51 and the straight line connecting the weight screw 61 arranged at the initial position and the axis O is about 45 degrees. Has been. However, it is not limited to this angle. Further, in each of the drawings other than FIG. 6, the state in which the weight screw 61 is located at the initial position is illustrated as an example.

In this state, for example, when the ambient temperature rises, the thermal expansion coefficient of the arm portion 51 is larger than that of the balance wheel 52, so that the arm portion 51 moves the balance wheel 52 radially outside. Deform toward. Thereby, the balance wheel 52 can be deformed into an ellipse (shown by an imaginary line A) in a state where the major axis is oriented in the extending direction of the arm portion 51.
Here, the spring mainspring 41 of the present embodiment has a tendency that the spring constant decreases as the temperature rises and the vibration period of the balance 40 increases, so adjustment to reduce the moment of inertia is necessary to cancel this. It is said. Therefore, after loosening the connection screw 56, the arm portion 51 and the balance wheel 52 are moved relative to each other in the circumferential direction, so that the position of the weight screw 61 is changed from the initial position to the direction of arrow C shown in FIG. Move so that the angle θ increases.

  As a result, the weight screw 61 can be moved inward in the radial direction as the balance wheel 52 is deformed, and the moment of inertia can be reduced. At this time, the amount of change of the weight screw 61 whose position changes in the radial direction with the deformation of the balance wheel 52 can be adjusted depending on how much the weight screw 61 is moved in the circumferential direction from the initial position. The rate of change of the moment of inertia with respect to can be adjusted, and temperature correction can be performed precisely.

In particular, unlike the conventional method using a chill screw, the arm portion 51 and the weight screw 61 can be freely moved relative to each other without being restricted in the circumferential direction. Can be continuously and continuously adjusted. That is, since a screw hole for fixing the chiller screw is not required, the interval between the screw holes is not limited to the adjustment accuracy of the inertia moment, and fine adjustment of temperature correction can be continuously performed.
As a result, the rate of change of the inertia moment with respect to the temperature change can also be adjusted steplessly and continuously, and the adjustment accuracy of the inertia moment can be improved. Therefore, the temperature dependence of the vibration cycle of the balance with hairspring 40 can be suppressed, and the balance with excellent temperature compensation performance can be obtained in which the rate does not easily change due to a temperature change.

In addition, it is not necessary to perform a replacement work such as once removing the flicker screw and reattaching it to another mounting position as in the prior art, and since the inertia moment temperature correction work can be performed continuously, it is easy and easy to perform.
Further, since it is not necessary to reattach the weight screw 61, it is possible to suppress variations in the moment of inertia due to an attachment error caused by a change in the amount of screwing. Therefore, adjustment management of the change rate of the moment of inertia can be facilitated, and the number of steps required for the adjustment work can be reduced. At the same time, when the weight screw 61 is reattached, it is necessary to readjust the balance of the balance with hairspring 40. However, since this work is also unnecessary, simple and continuous temperature correction can be performed.
Moreover, since the pair of weight screws 61 are fixed to the balance wheel 52 so as to face each other in the radial direction across the axis O, the balance of the balance of the balance with hairspring 40 is not easily lost. Further, since the pair of weight screws 61 can be simultaneously moved in the same direction and in the circumferential direction, the temperature correction operation can be performed very easily.

In addition, it is possible to use the balance spring 41 made of a general material that is not a special characteristic and has a spring constant that decreases as the temperature rises. Therefore, versatility as the balance with hairspring 40 can be improved and the cost can be reduced. It is easy to plan.
Furthermore, since the arm 51 and the weight screw 61 can be relatively moved in the circumferential direction by a simple operation in which the arm 51 and the balance wheel 52 are relatively moved in the circumferential direction, temperature correction can be easily performed also in this respect. Work can be performed and the adjustment accuracy can be improved more easily. Moreover, since the adjustment mechanism 65 can be comprised by the recessed part 60 and the connection screw 56, it is easy to aim at simplification of a structure.

In addition, according to the movement 10 of the present embodiment, the balance 40 is provided with the above-described balance with high temperature compensation performance with improved inertia moment adjustment accuracy, so that the high-quality movement 10 with less error in yield is provided. be able to.
Furthermore, according to the mechanical timepiece 1 of this embodiment provided with the movement 10, a high-quality timepiece having a small error in the yield rate is obtained.

In the first embodiment, the convex portion that is movably engaged in the concave portion 60 formed in the balance wheel 52 is the connection screw 56. However, the present invention is not limited to this case. For example, the opposing wall of the arm portion 51 is used. A protruding portion that protrudes from the portion 51b toward the outside in the radial direction and is movably engaged in the recessed portion 60 may be used as the protruding portion. In this case, it is preferable that the arm portion 51 and the balance wheel 52 be prevented from rotating unexpectedly due to, for example, contact resistance between the concave portion 60 and the protruding portion.
Further, the concave portion 60 may be formed not on the balance wheel 52 but on the opposing wall portion 51b of the arm portion 51, and the convex portion may be formed on the balance wheel 52 instead of the opposing wall portion 51b. Even in this case, the same effect can be obtained.

Second Embodiment
Next, a second embodiment according to the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, the arm portion 51 and the balance wheel 52 are relatively movable in the circumferential direction, but in the second embodiment, the arm portion 51 and the balance wheel 52 are integrally connected.

(Structure of balance)
As shown in FIG. 7, in the balance (temperature compensated balance) 70 according to the present embodiment, the opposing wall portion 51 b of the arm portion 51 and the balance wheel 52 are integrally connected by a connection screw 71. Further, the balance wheel 52 is formed with a circumferentially extending recess 72 facing the radial direction across the axis O at a position spaced from the connecting portion with the arm portion 51 in the circumferential direction.
Further, on the inner peripheral surface side of the balance wheel 52, engagement pieces (convex portions) 73 that are movably engaged with the respective concave portions 72 are respectively arranged. As shown in FIGS. 7 and 8, the engagement piece 73 is a plate piece formed in an arc shape in plan view that follows the curvature of the balance wheel 52, and a screw hole 73 a is formed at the center in the circumferential direction. Has been. Further, the engagement piece 73 is provided with an engagement protrusion 73b that engages in the recess 72, and is disposed, for example, at intervals in the circumferential direction so as to sandwich the screw hole 73a therebetween.

  The weight screw 61 is screwed into the screw hole 73a of the engagement piece 73 through the recess 72 so as to sandwich the balance wheel 52 from outside in the radial direction of the balance wheel 52. At this time, since the engagement piece 73 is provided with a pair of the engagement protrusions 73b, the engagement piece 73 is restricted from rotating together. In the case of the present embodiment, the concave portion 72 and the engagement piece 73 described above function as the adjustment mechanism 74.

(Inertia moment temperature correction method)
According to the balance with the balance 70 of the present embodiment configured as described above, the engagement piece 73 can be moved in the circumferential direction along the recess 72 by loosening the weight screw 61. The weight screw 61 can be relatively moved in the circumferential direction. Therefore, similarly to the first embodiment, the temperature correction operation of the moment of inertia can be easily performed, and the adjustment accuracy can be improved because it can be performed steplessly and continuously. Moreover, since the adjustment mechanism 74 can be comprised by the recessed part 72 and the engagement piece 73, a simplification of a structure can also be aimed at.
When the weight screw 61 is moved in the circumferential direction, it may be moved by the same amount in the same direction so as to always face the radial direction across the axis O.

  In particular, in the case of the present embodiment, the connecting portion between the balance wheel 52 and the arm portion 51 has no backlash such as a gap and can be connected together, so that the balance stem 50 and the balance wheel 52 are connected to each other. The balance can be arranged more accurately on the same axis, and the balance of the balance of the balance 70 can be easily improved.

<Third Embodiment>
Next, a third embodiment according to the present invention will be described with reference to the drawings. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, the balance wheel 52 is a single component, but in the third embodiment, the balance wheel 52 is formed of two components.

(Structure of balance)
As shown in FIG. 9, a balance (temperature-compensated balance) 80 according to this embodiment includes a balance wheel 52, a first balance wheel 81 attached to the arm portion 51, a weight screw 61, and a first balance. The second balance wheel 82 attached to the ring 81 so as to be rotatable relative to the ring 81 is formed in a double ring shape.

  The first balance wheel 81 is disposed on the outer side in the radial direction than the second balance wheel 82. The arm portion 51 extends so as to protrude outward in the radial direction from the first balance wheel 81, and the opposing wall portion 51 b is disposed to face the outer peripheral surface side of the first balance wheel 81. And the opposing wall part 51b and the 1st balance wheel 81 are integrally connected by the connection screw 83 attached from the radial direction outer side of the opposing wall part 51b.

The first balance wheel 81 is formed with a recess 84 extending in the circumferential direction so as to face the radial direction across the axis O at a position spaced from the connecting portion with the arm 51 in the circumferential direction.
The weight screw 61 is screwed to the second balance wheel 82 from the outside in the radial direction of the first balance wheel 81 through the recess 84 so as to sandwich the first balance wheel 81. At this time, the weight screw 61 is fixed to the second balance wheel 82 so as to face the radial direction across the axis O.
In the case of this embodiment, the first balance wheel 81 and the second balance wheel 82 also function as the adjustment mechanism 85.

(Inertia moment temperature correction method)
According to the balance 80 of the present embodiment configured as described above, after the weight screw 61 is loosened, the second balance wheel 82 is simply operated by relatively rotating the first balance wheel 81 and the second balance wheel 82. The weight screw 61 fixed to the balance wheel 82 can be moved in the circumferential direction, whereby the weight screw 61 and the arm portion 51 can be relatively moved in the circumferential direction. Therefore, it is possible to easily perform the temperature correction operation of the moment of inertia and to perform the stepless and continuous operation, thereby improving the adjustment accuracy.

Further, since the relative rotation between the first balance wheel 81 and the second balance wheel 82 can be easily regulated and released by tightening the weight screw 61, the temperature correction operation can be easily performed in this respect as well. Even in the case of this embodiment, there is no backlash such as a gap in the connecting portion between the first balance wheel 81 and the arm portion 51 as in the above-described second embodiment, and the two are integrally connected. Therefore, the balance stem 50 and the balance wheel 52 can be arranged on the same axis with high accuracy, and the balance of the balance of the balance 80 can be easily improved.
Further, since the weight screw 61 is fixed to the second balance wheel 82 so as to face the radial direction across the axis O, the balance of the balance of the balance with hairspring 80 is not easily lost in this respect. In addition, since the pair of weight screws 61 can be simultaneously moved in the same direction and in the circumferential direction, the temperature correction can be performed very simply.

<Fourth embodiment>
Next, a fourth embodiment according to the present invention will be described with reference to the drawings. In the fourth embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the third embodiment, the first balance wheel 81 is disposed on the outer side in the radial direction than the second balance wheel 82, but in the fourth embodiment, the second balance wheel 82 has a diameter larger than that of the first balance wheel 81. It is arranged outside the direction.

(Structure of balance)
As shown in FIGS. 10 and 11, in the balance (temperature-compensated balance) 90 according to this embodiment, the first balance wheel 81 is disposed radially inward of the second balance wheel 82, and the arm portion 51. The arm portion 51 is integrally connected to both ends in the radial direction by connecting screws 91 attached from below. The arm portion 51 projects outward in the radial direction from the first balance wheel 81 and supports the second balance wheel 82 from below.

In addition, the first balance wheel 81 is formed with a first claw portion 81a projecting outward in the radial direction and projecting downward in an annular shape over the entire circumference. On the other hand, the second balance wheel 82 is formed with a second claw portion 82a projecting inward in the radial direction and projecting upward in an annular shape over the entire circumference. The first balance wheel 81 and the second balance wheel 82 are relatively rotatable with the first claw portion 81a and the second claw portion 82a engaged with each other.
Further, as shown in FIGS. 10 to 12, the weight screw 61 is fixed to the second balance wheel 82 so as to face the radial direction across the axis O, and the second balance wheel 82 is fixed to the first balance wheel. It is clamped between the ring 81.

(Inertia moment temperature correction method)
According to the balance 90 of the present embodiment configured as described above, after the weight screw 61 is loosened, the second balance wheel 82 is simply operated by relatively rotating the first balance wheel 81 and the second balance wheel 82. The weight screw 61 fixed to the balance wheel 82 can be moved in the circumferential direction, whereby the weight screw 61 and the arm portion 51 can be relatively moved in the circumferential direction.
Therefore, similarly to the third embodiment, the temperature correction operation of the moment of inertia can be easily performed, and the adjustment accuracy can be improved because it can be performed steplessly and continuously.
In particular, since the first balance wheel 81 and the second balance wheel 82 are engaged with each other over the entire circumference via the first claw portion 81a and the second claw portion 82a, The second balance wheel 82 can be easily deformed while being synchronized.

Even in the case of the present embodiment, the relative rotation between the first balance wheel 81 and the second balance wheel 82 can be easily regulated and released by tightening the weight screw 61. Temperature correction work can be performed.
Further, even in the case of the present embodiment, the first balance wheel 81 and the arm portion 51 can be integrally connected, so that the balance stem 50 and the balance wheel 52 can be arranged more accurately on the same axis, It is easy to improve the rotation balance of the balance with hairspring 90. Further, since the weight screw 61 is fixed to the second balance wheel 82 so as to face the radial direction across the axis O, the balance of the balance of the balance with hairspring 90 is not easily lost in this respect.
In addition, since the pair of weight screws 61 can be simultaneously moved in the same direction and in the circumferential direction, the temperature correction can be performed very simply. In the case of this embodiment, the weight screw 61 can be freely rotated 360 degrees around the axis O.

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

  For example, in each of the above embodiments, the case where the thermal expansion coefficient of the arm portion 51 is larger than that of the balance wheel 52 is taken as an example, but the opposite may be possible. In this case, for example, a balance spring 41 made of a material whose spring constant increases with increasing temperature may be used in combination.

O ... Axis 1 ... Mechanical watch 10 ... Movement (watch movement)
22 ... barrel wheel 30 ... escapement mechanism 40, 70, 80, 90 ... balance (temperature compensated balance)
41 ... Hairspring (temple spring)
50 ... Tenshin 51 ... Arm part 52 ... Balance wheel 56 ... Connecting screw (convex part)
60, 72 ... concave part 61 ... weight screw (weight part)
65, 74, 85 ... adjusting mechanism 73 ... engaging piece (convex part)
81 ... First balance wheel 82 ... Second balance wheel

Claims (9)

With the balance rotating around the axis,
An annular balance wheel attached to the balance via an arm portion extending in the radial direction of the balance and having a thermal expansion coefficient different from the thermal expansion coefficient of the arm section;
A plurality of weight portions provided on the balance wheel at intervals in the circumferential direction of the balance ;
And a control mechanism for the relatively movable in distichum direction prior to the plurality of parts at the same time the arm portion,
The temperature-compensated balance balance, wherein the plurality of weight portions are provided on the balance wheel in a state in which relative positions in the circumferential direction are fixed . In the temperature compensated balance according to claim 1,
The temperature-compensated balance balance characterized in that the arm portion has a larger coefficient of thermal expansion than the balance wheel. In the temperature compensation type balance according to claim 1 or 2,
The adjustment mechanism is
A convex portion provided on one of the arm portion and the balance wheel;
A recess provided on the other of the arm part and the balance wheel and extending along the circumferential direction,
A temperature-compensated balance balance, wherein the convex portion is movably engaged with the concave portion, thereby allowing the arm portion and the weight portion to move relative to each other in the circumferential direction. In the temperature compensation type balance according to claim 1 or 2,
The balance wheel is
A first balance wheel attached to the arm portion;
A second balance wheel provided with the weight portion and attached to the first balance wheel so as to be rotatable relative to the first balance wheel;
The adjustment mechanism is
A temperature-compensated balance balance characterized in that the arm portion and the weight portion can be relatively moved in the circumferential direction by relatively rotating the first balance wheel and the second balance wheel. . The temperature-compensated balance according to claim 4 ,
The first balance wheel is disposed radially outside the second balance wheel;
The first balance wheel is formed with a recess extending along the circumferential direction,
The temperature-compensated balance balance is characterized in that the weight portion is a screw member fixed to the second balance wheel through the concave portion from the outside in the radial direction of the first balance wheel. The temperature-compensated balance according to claim 4 ,
The first balance wheel is disposed radially inward of the second balance wheel;
The weight compensation balance is fixed to the second balance wheel and is a screw member that presses the first balance wheel from the outside in the radial direction. In the temperature compensation type balance according to any one of claims 1 to 6 ,
A balance spring that transmits power for rotating the balance wheel with a constant vibration cycle to the balance wheel,
The balance spring is characterized in that the balance spring is made of a material whose spring constant decreases with increasing temperature. A barrel complete with a power source;
A train wheel for transmitting the rotational force of the barrel wheel,
An escapement mechanism for controlling rotation of the train wheel;
A timepiece movement comprising: the temperature-compensated balance according to claim 1, which adjusts the speed of the escapement mechanism. A mechanical timepiece comprising the timepiece movement according to claim 8 .

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