JP2014160037A - Balance, timepiece movement, and mechanical clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balance allowing an adjustment work of an inertia moment in a wide adjustable range, securing a fixed rigidity, and suppressing thickness in an axial direction to suppress an influence on an installing space of a balance spring.SOLUTION: A balance 40 includes a balance staff 41, a balance wheel 42 connected with the balance staff and in which a plurality of guide holes 50 are formed, and a weight part 51 movable along the guide hole. The guide hole extends in a diameter direction of a rotating axis O of the balance staff, and is placed with a space in a circumference of the rotating axis. The weight part is movably stored along the guide hole in the diameter direction of the rotating axis while at least its part is stored in the guide hole from a width direction of the balance wheel.

Description

  The present invention relates to a balance with a balance, a timepiece movement, 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 hair is a member that vibrates by rotating forward and backward periodically around the true rotation axis, and it is important that the vibration cycle is set within a predetermined value. This is because if the vibration period deviates from the specified value, the rate of the mechanical timepiece (timepiece delay, degree of advancement) changes. However, the vibration period is likely to change due to various causes, and adjustment work is required when assembling a mechanical timepiece.
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”. Accordingly, it is possible to adjust the vibration cycle of the balance by adjusting the moment of inertia of the balance or the spring constant of the hairspring. Among these, as a method of adjusting the spring constant of the hairspring, for example, a method of adjusting the hairspring by changing the length of the hairspring using a slow and steep needle is known.

  On the other hand, Friesprung is known as a mechanism for changing the vibration period by changing the moment of inertia of the balance with the balance and thereby adjusting the rate of the watch.

As one of the fleece prungs, for example, as shown in FIG. 18, a plurality of screw threads 210 and mass screws 211, which form weights, are spaced apart in the circumferential direction with respect to an annular rim portion 200 constituting a balance wheel. There is known a method of adjusting the amount of screwing of each mass screw 211 (withdrawing / withdrawing in the radial direction).
There is also known a method of changing the radial position of the chiller screw 210 by attaching the chiller screw 210 with a washer (not shown) interposed therebetween without changing the mass screw 211 and changing the number of the washers.
Further, as shown in FIG. 19, a method of changing the opening direction by attaching a plurality of C-shaped ring members 220 serving as weights at intervals in the circumferential direction of the rim portion 200 and rotating each ring member 220. It has been known.
Each of the above-described methods is disclosed in Non-Patent Document 1, for example.

  According to each method described above, the radial position of the mass screw 211 or the chill screw 210 changes or the center of gravity of the ring member 220 changes, so that the distance from the rotation axis O can be changed, thereby It becomes possible to adjust the moment of inertia.

Further, as one of the free springs, for example, as shown in FIG. 20, the balance wheel 230 is constituted by an annular rim portion 230A, and an Archimedes spiral rail portion 230C that connects the balance stem 230B and the rim portion 230A. There is also known a method of moving two weight portions 250 attached to the rotating needle portion 240 along the rail portion 230C by rotating the rotating needle portion 240 rotatably attached to the balance stem 230B (patent). Reference 1).
According to this method, since the two weight portions 250 can be simultaneously moved in the radial direction along the rail portion 230C, the distance from the rotation axis O can be similarly changed, thereby adjusting the moment of inertia. It becomes possible to do.

Hans Jendritzki, “Watch Adjustment”, 2006 reprint (first edition in 1970), p6-p8

U.S. Pat. No. 2,880,570

  However, in the conventional method of adjusting the moment of inertia using the mass screw, the chiller screw, or the ring member, the adjustment work of the mass screw, the chiller screw, or the ring member takes time and the adjustment tends to take time. In addition, the adjustment range of the moment of inertia is small, and there is room for improvement. If the adjustment range is to be increased, it is necessary to provide a large number of mass screws, chill screws, and ring members, which further reduces workability.

On the other hand, in the method in which the two weight portions are moved simultaneously along the rail portion, the weight portion can be moved greatly in the radial direction, so that it is easy to ensure a large adjustment range of the moment of inertia. However, since the rail portion extends in the Archimedes spiral shape, the entire length is inevitably long and the rigidity is lowered. Therefore, for example, the rail portion may be deformed when subjected to an external impact such as dropping.
In addition, since the rail portion, the weight portion, and the rotating needle portion have a so-called three-layer structure in which they overlap in the axial direction, the installation space for the hairspring is easily cut.

  The present invention has been made in view of such circumstances, and the purpose thereof is to adjust the moment of inertia in a wide adjustment range, ensure a certain rigidity, and reduce the axial thickness. An object of the present invention is to provide a balance with a balance that can suppress the influence on the installation space of the hairspring, a movement for a timepiece having the balance, and a mechanical timepiece.

The present invention provides the following means in order to solve the above problems.
(1) A balance according to the present invention is capable of moving along a balance wheel rotating about an axis, a balance wheel connected to the balance and having a plurality of guide holes, and the guide holes. A weight portion, and the guide hole extends in a radial direction of the rotation shaft of the balance stem, and is arranged at intervals around the rotation shaft, and the weight portion has a thickness of the balance wheel. From the direction, the guide hole is held so as to be movable in the radial direction of the rotating shaft along the guide hole in a state where at least a part is accommodated in the guide hole.

According to the balance according to the present invention, by moving the weight portion along the guide hole, the position of the weight portion can be changed in the radial direction of the true rotation shaft. The distance to the entire center of gravity can be changed. Thereby, the inertia moment of the balance with hairspring can be adjusted, and the rate can be adjusted by changing the vibration period of the balance with the balance.
In particular, since the guide hole is a long hole extending in the radial direction of the rotation shaft, the weight portion can be greatly moved in the radial direction along the guide hole, and the inertia moment can be adjusted in a wide adjustment range. . Further, since only the weight portion needs to be moved, the inertia moment adjustment work can be easily performed. Further, the moment of inertia can be finely adjusted by finely adjusting the position of the weight portion.

Further, unlike the conventional one in which the weight portion is moved along the rail portion, the guide hole formed in the balance wheel is used, so that the rigidity of the balance wheel itself is hardly lowered and a certain rigidity can be secured. Therefore, even if an external impact or the like is received, the adjustment amount of the inertia moment adjusted once hardly changes, and a high-performance balance can be obtained.
Furthermore, since at least a portion of the weight portion is accommodated in the guide hole from the thickness direction of the balance wheel (the axial direction of the rotation shaft), the entire thickness of the balance wheel and the weight portion can be suppressed. Therefore, the influence which it has on the installation space of the hairspring can be suppressed.

(2) In the balance according to the present invention, it is preferable that at least one of the weight portion and the guide hole is provided with a resistance applying portion that applies resistance to movement of the weight portion.

  In this case, resistance can be applied to the movement of the weight portion, so that the weight portion can be prevented from moving in the radial direction unexpectedly, and the position of the weight portion in the radial direction can be easily defined. Therefore, the inertia moment adjustment operation can be performed more easily and accurately, and the inertia moment once adjusted can be prevented from being changed by unintended movement of the weight portion.

(3) In the balance according to the present invention, the resistance applying portion protrudes from the weight portion toward the inner wall surface of the guide hole, and urges the weight portion against the inner wall surface of the guide hole. It is preferable that

In this case, since the weight portion can be pressed against the inner wall surface of the guide hole by using the urging force of the elastic body, the frictional resistance between the weight portion and the inner wall surface of the guide hole is increased. Can do. Thereby, resistance can be provided to the movement of the weight portion.
As described above, since the resistance can be imparted to the movement of the weight portion with a simple configuration in which an elastic body is provided on the weight portion, the configuration can be easily simplified. Moreover, since the shakiness of the weight part in a guide hole can also be suppressed, a balance with a balance can be rotated with a favorable balance.

(4) In the balance according to the present invention, at least one of the weight part and the guide hole restricts the position of the weight part in the thickness direction of the balance wheel with respect to the guide hole. It is preferable that a restricting portion is provided.

  In this case, it is possible to regulate the position of the weight part in the thickness direction of the balance wheel with respect to the guide hole while allowing the movement of the weight part in the radial direction along the guide hole. Can be prevented from coming off. Therefore, the weight portion can be stably moved in the radial direction along the guide hole, and the inertia moment can be easily adjusted. Moreover, since the shakiness of the weight part in the thickness direction can be prevented, the balance with the balance can be rotated with a good balance.

(5) In the balance according to the present invention, the restricting portion protrudes from the inner wall surface of the guide hole in a direction orthogonal to the thickness direction, and a protruding strip portion formed along the guide hole; It is preferable that the outer peripheral surface of the weight portion is provided with an engagement groove that is recessed along the moving direction of the weight portion and that engages with the ridge portion.

  In this case, the engagement of the convex portion on the guide hole side and the engagement groove on the weight portion side allows the movement of the weight portion in the radial direction along the guide hole, while the balance wheel with respect to the guide hole is allowed to move. The position of the weight portion in the thickness direction can be reliably regulated.

(6) In the balance according to the present invention, it is preferable that the guide hole extends linearly along the radial direction of the rotation shaft.

  In this case, since the guide hole extends linearly along the radial direction, the position of the weight portion can be changed efficiently in the radial direction, and the inertia moment adjustment work can be easily performed efficiently.

(7) In the balance according to the present invention, it is preferable that the guide hole extends in a radial direction of the rotating shaft while being curved.

  In this case, since the guide hole is curved and extends in the radial direction while being curved in a spiral shape such as Archimedes spiral, for example, even if the weight is moved along the guide hole, the movement in the radial direction is performed. The amount is easy to make small. Therefore, the amount of change in the moment of inertia per moving distance of the weight can be suppressed, and finer adjustment of the moment of inertia can be performed.

(8) In the balance with hair according to the present invention, it is preferable that the weight portion is entirely accommodated in the guide hole.

  In this case, since the whole weight part is completely accommodated in the guide hole, the influence on the installation space of the hairspring can be further suppressed. Further, since the weight portion can be completely accommodated in the guide hole, it is possible to suppress the viscous frictional resistance of the air when the balance is rotated, and to improve the rotation performance.

(9) In the balance according to the present invention, the weight portion preferably includes a first weight portion and a second weight portion having a mass different from that of the first weight portion.

  In this case, since the first weight portion and the second weight portion having different weights are provided, the moment of inertia is first roughened (larger) by moving, for example, the heavier weight portion of both weight portions. It can be adjusted, and after that, by moving the lighter weight part, the inertia moment can be adjusted finely (smallly). Therefore, by adjusting the use of the first weight part and the second weight part, it is possible to accurately adjust the finer moment of inertia.

(10) A timepiece movement according to the present invention includes a barrel wheel having a power source, a train wheel that transmits the rotational force of the barrel wheel, an escapement mechanism that controls rotation of the train wheel, and the escapement mechanism. The balance according to the present invention for adjusting the speed is provided.

  According to the timepiece movement according to the present invention, the balance with the balance capable of easily and simply adjusting the moment of inertia in a wide adjustment range as described above is provided. Movement.

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

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

  According to the present invention, it is possible to easily and easily adjust the moment of inertia in a wide adjustment range, and to easily and accurately adjust the rate by changing the vibration cycle as intended. In addition, it is possible to maintain a certain level of rigidity and maintain the quality, and to suppress the axial thickness, thereby suppressing the influence of the hairspring on the installation space.

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 perspective view of the balance with the movement shown in FIG. It is AA sectional drawing shown in FIG. It is a perspective view of the balance wheel which comprises the balance shown in FIG. It is a figure which shows 2nd Embodiment which concerns on this invention, Comprising: It is an expanded sectional view which shows the periphery of the weight part accommodated in the guide hole. It is a figure which shows the modification of 2nd Embodiment, Comprising: It is a perspective view of a balance wheel. It is a figure which shows 3rd Embodiment which concerns on this invention, Comprising: It is a perspective view (partial sectional view) of a balance wheel. It is an expansion perspective view of the weight part shown in FIG. It is a figure which shows 4th Embodiment which concerns on this invention, Comprising: It is a perspective view (partial sectional view) of a balance wheel. FIG. 10 is an enlarged perspective view of the periphery of the weight portion shown in FIG. 9, showing a state where the lid and the weight portion are removed. FIG. 10 is an enlarged perspective view around the weight portion shown in FIG. 9. It is a figure which shows the modification of 3rd Embodiment, Comprising: It is a longitudinal cross-sectional view of the connection bridge in which the guide hole was formed. It is a figure which shows 5th Embodiment which concerns on this invention, Comprising: It is a perspective view (partial sectional view) of a balance wheel. FIG. 14 is an enlarged perspective view of the periphery of the weight portion shown in FIG. 13, showing a state before the weight portion is assembled. FIG. 14 is an enlarged perspective view around the weight portion shown in FIG. 13. It is a figure which shows the modification which concerns on this invention, Comprising: It is a perspective view of the balance wheel formed so that a guide hole might be extended in radial direction, curving. It is a figure which shows the modification which concerns on this invention, Comprising: It is a perspective view of the balance wheel which has a weight part from which weight differs. It is a top view which shows an example of the conventional balance with a balance. It is a top view which shows another example of the conventional balance with a balance. It is a top view which shows another example of the conventional balance with a balance.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<First Embodiment>
[Configuration of mechanical watch, watch movement and balance]
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 28, 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 at the first winding stem position (0th stage) closest to the inside of the movement 10 along the rotation axis direction, for example. As a result, the chisel wheel 17 rotates through the rotation of the pinion 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 28 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 has a function of transmitting the rotational force of the barrel wheel 22. . Further, an escapement mechanism 30 and a speed control mechanism 31 for controlling the rotation of the front train wheel 28 are disposed 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 that controls the rotation of the front wheel train 28 described above, and an escape wheel 35 that meshes with the fourth wheel 27 and an ankle that moves the escape wheel 35 and rotates it regularly. 36.
The speed regulating mechanism 31 is a mechanism for regulating the escapement mechanism 30, and includes a balance 40.

(Structure of balance)
As shown in FIGS. 2 and 3, the balance with hairspring 40 rotates around an axis (rotation axis) O (rotates about the axis), and is attached to the balance 41 and includes a plurality of guides. A balance wheel 42 in which a hole 50 is formed, a weight portion 51 that is movable along the guide hole 50, and a hairspring 43 (spring spring), and the axis line is generated by the power transmitted from the hairspring 43. It is a member that can be rotated forward and backward with a constant vibration period around O.

  In the present embodiment, a direction orthogonal to the axis O is referred to as a radial direction, a direction around the axis O is referred to as a circumferential direction, and a direction along the axis O is referred to as an axial direction. Further, in the axial direction, the hairspring 43 side is the upper side, and the opposite direction is the lower side.

  The balance stem 41 is a rotating shaft body that extends 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 above-described movement 10. A substantially intermediate portion in the vertical direction of the balance stem 41 is a large diameter portion 41a having the largest diameter. Further, in the balance stem 41, a cylindrical swing seat 45 is externally provided coaxially with the axis O at a portion located below the large diameter portion 41a. The swing seat 45 has an annular flange 45a projecting outward in the radial direction, and a swing stone 46 for swinging the ankle 36 is fixed to the flange 45a. .

  The hairspring 43 is, for example, a flat whiskers wound spirally in one plane, and the inner end portion of the hairspring 43 is fixed to a portion located above the large-diameter portion 41 a of the balance stem 41 via a whisker ball 47. ing. The balance spring 43 plays a role of storing power transmitted from the fourth wheel 27 to the escape wheel 35 and transmitting the power to the balance wheel 42 as described above.

  As shown in FIG. 4, the balance wheel 42 is arranged coaxially with the axis O, and surrounds the balance stem 41 from the outside in the radial direction, and the rim portion 55 and the balance stem 41 in the radial direction. And a connecting member 56 to be connected.

The connecting member 56 includes four connecting bridges 56A that extend in the radial direction and are spaced apart in the circumferential direction. In the illustrated example, the four connecting bridges 56A are arranged at intervals of 90 degrees in the circumferential direction around the axis O so as to be arranged in a cross shape in plan view. Thereby, each connection bridge 56A is arrange | positioned so that it may oppose on the opposite side of radial direction on both sides of the axis line O, respectively.
Each of the connecting bridges 56A has a radially outer end portion integrally connected to an inner peripheral portion of the rim portion 55, and the radially inner end portions are connected to each other to be integrated. A shaft hole 57 that is coaxial with the axis O is formed at a portion where the radially inner end portions of the connecting bridges 56A are connected and integrated.

  The balance wheel 42 is integrally attached to the balance stem 41 by being fixed to the large diameter portion 41a of the balance stem 41 through the shaft hole 57, for example, by press fitting or the like (see FIG. 3).

The guide hole 50 is formed in each connection bridge 56 </ b> A of the connection member 56 constituting the balance wheel 42. Specifically, the guide hole 50 is formed so as to extend linearly along the radial direction of the axis O, and is located at the center in the circumferential direction (the center in the width direction) of the connection bridge 56A.
In the illustrated example, the guide hole 50 is formed in a region from the radial intermediate portion to the connection portion with the rim portion 55 in the connecting bridge 56A. You may form so that it may extend toward. The guide hole 50 is a through-hole that penetrates the connecting bridge 56A in the axial direction.

The weight portion 51 is held so as to be movable in the radial direction along the guide hole 50 in a state where the weight portion 51 is entirely accommodated in the guide hole 50.
In the example shown in the drawing, the weight portion 51 has a length L1 in the radial direction that is approximately 1/3 of the length of the guide hole 50 and a width L2 that is in pressure contact with the inner wall surface 50a of the guide hole 50. The block body is formed into an elliptical shape in plan view that is long in the radial direction. The weight 51 has the same thickness as the balance wheel 42.
The weight 51 having such a shape is movably held in the guide hole 50 by being pressed into the guide hole 50 by, for example, press-fitting.

[Method of adjusting the moment of inertia]
Next, a method for adjusting the moment of inertia using the balance 40 will be described.
In this case, as shown in FIG. 2, the weight portions 51 positioned on the opposite side in the radial direction across the axis O are arranged in the same direction along the guide hole 50 (inner side in the radial direction or outer side in the radial direction). ), The position of the weight portion 51 can be changed in the radial direction in the same manner, so that the distance from the axis O to the center of gravity of the balance 40 can be changed. Thereby, the inertia moment of the balance with hairspring 40 can be adjusted, and the rate can be adjusted by changing the vibration cycle of the balance with hairspring 40.

  In particular, since the guide hole 50 is a long hole extending linearly along the radial direction, the weight portion 51 can be efficiently moved large in the radial direction along the guide hole 50, and inertia can be achieved over a wide adjustment range. You can adjust the moment. Further, since only the weight portion 51 needs to be moved, the inertia moment adjustment work can be easily performed. Furthermore, the moment of inertia can be finely adjusted by finely adjusting the position of the weight portion 51.

  Further, unlike the conventional one in which the weight portion is moved along the rail portion, the guide hole 50 formed in the connection bridge 56A in the balance wheel 42 is used. Therefore, the rigidity of the balance wheel 42 itself can be ensured by the four connecting bridges 56A and the annular rim portion 55, and even if the guide hole 50 is formed, it is difficult to cause an excessive decrease in rigidity of the balance wheel 42 and is constant. Can be secured. Therefore, even if an external impact is applied due to dropping or the like, for example, the adjustment amount of the moment of inertia adjusted once hardly changes, and the balance with high performance can be obtained.

  As described above, since the rigidity of the balance wheel 42 can be ensured, even if the balance wheel 42 is formed of, for example, a ceramic material such as silicon that is a brittle material, it is easy to ensure the necessary rigidity. Therefore, it is possible to manufacture the fine wheel 42 more efficiently and using a semiconductor manufacturing technique (such as a photolithography technique or an etching technique), and it is possible to reduce the weight.

  Further, since the weight portion 51 is completely accommodated in the guide hole 50, the thickness of the weight portion 51 can be absorbed by the thickness of the balance wheel 42, so that the thickness of the balance wheel 42 is sufficient. Therefore, the influence on the installation space of the hairspring 43 can be suppressed. In addition, since the weight portion 51 can be accommodated in the guide hole 50, the viscous frictional resistance of air when the balance 40 is rotated can be suppressed, and the rotation performance can be improved.

In addition, according to the movement 10 of the present embodiment, as described above, the balance 40 is provided that can easily and simply adjust the moment of inertia in a wide adjustment range, so that there is little error in rate. It can be a high-quality movement.
Furthermore, according to the mechanical timepiece 1 of this embodiment provided with the movement 10, a high-quality timepiece having a low rate error is similarly 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 weight portion 51 is merely accommodated in the guide hole 50, but in the second embodiment, resistance is given to the movement of the weight portion 51.

(Structure of balance)
As shown in FIG. 5, in the balance with hairspring 60 of the present embodiment, the weight portion 51 is provided with a resistance applying portion 61 that applies resistance to the movement of the weight portion 51.
Specifically, the outer peripheral surface of the weight portion 51 that protrudes from the weight portion 51 toward one inner wall surface 50 a of the guide hole 50 and is opposite to the protruding direction is the other inner wall surface of the guide hole 50. A leaf spring (elastic body) 62 that urges the weight portion 51 is integrally provided on the weight portion 51 so as to be pressed against the weight portion 50a.

  In the illustrated example, the plate spring 62 is formed in an arc shape in plan view, and an intermediate portion 62c between a base end portion 62a connected to the weight portion 51 and a free end portion 62b is a guide. An urging force (spring force) is applied in contact with one inner wall surface 50 a of the hole 50. Therefore, this leaf spring 62 functions as the resistance applying portion 61.

(Function and effect)
According to the balance 60 of the present embodiment configured as described above, the weight portion 51 can be pressed against the inner wall surface 50a of the guide hole 50 using the urging force (spring force) by the leaf spring 62. The frictional resistance between the weight 51 and the inner wall surface 50a of the guide hole 50 can be increased. Thereby, resistance can be given to the movement of the weight part 51.
Therefore, it can suppress that the weight part 51 moves to radial direction unexpectedly, and it is easy to prescribe | regulate the position of the weight part 51 to radial direction. Therefore, the adjustment work of the inertia moment can be performed more easily and accurately, and the inertia moment once adjusted can be prevented from being changed by the unintended movement of the weight portion 51.

In addition, since the resistance can be imparted to the movement of the weight portion 51 with a simple configuration in which the weight portion 51 is simply provided with the leaf spring 62, the configuration can be easily simplified. Moreover, since the rattling of the weight part 51 in the guide hole 50 can be suppressed, the balance 60 can be rotated with a good balance.
The elastic body is not limited to the leaf spring 62, and for example, an elastic block such as soft rubber or sponge may be employed.

(Modification)
In the second embodiment, the case where the leaf spring 62 provided on the weight portion 51 is used as an example of the resistance applying portion 61 has been described as an example. However, the case is limited to the case where the leaf spring 62 is provided. Instead, a resistance applying portion may be provided on the guide hole 50 side.

  For example, in the balance 70 shown in FIG. 6, two slit holes 71 extending in the radial direction along the guide holes 50 are formed in each connection bridge 56 </ b> A. The slit holes 71 are formed so as to be located on both sides of the guide hole 50 in the circumferential direction, and are formed at positions slightly separated from the guide hole 50 in the circumferential direction. Accordingly, it is possible to form a leaf spring-like elastic wall portion 72 having a spring property between the slit hole 71 and the guide hole 50.

The elastic wall portion 72 can be used to press the inner wall surface 50a of the guide hole 50 against the outer peripheral surface of the weight portion 51. The weight portion 51 is sandwiched from both sides in the circumferential direction to move the weight portion 51. Can be given resistance.
Therefore, even in this case, the elastic wall portion 72 can be caused to function as the resistance applying portion 73, and the same operational effects as when the leaf spring 62 is used can be achieved.
Further, the elastic wall portion 72 and the leaf spring 62 described above may be combined.

<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 second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, resistance is given to the movement of the weight portion 51, but in the third embodiment, the position of the weight portion 51 in the axial direction is further restricted.

(Structure of balance)
As shown in FIGS. 7 and 8, the balance with hairspring 80 of the present embodiment is provided with a restricting portion 81 that restricts the position of the weight portion 51 in the axial direction with respect to the guide hole 50. Specifically, the restricting portion 81 includes a protruding strip portion 82 provided on the guide hole 50 side and an engaging groove 83 provided on the weight portion 51 side, and is engaged with the protruding strip portion 82. The restriction is performed by engagement with the groove 83.

The protruding portion 82 protrudes from the inner wall surface 50 a of the guide hole 50 toward the inside of the guide hole 50 (projects toward the circumferential direction orthogonal to the axial direction) and extends in the radial direction along the guide hole 50. ing. In addition, the protruding item | line part 82 is formed so that it may protrude in V-shape view of a longitudinal cross section.
On the other hand, the weight portion 51 is formed with a recess along the moving direction of the weight portion 51 on the outer peripheral surface opposite to the side where the leaf spring 62 is provided. An engaging groove 83 to be engaged is formed. In the example shown in the figure, the engaging groove 83 is formed in a concave shape in a V shape in a longitudinal sectional view corresponding to the shape of the ridge 82.

(Function and effect)
According to the balance with hairspring 80 of the present embodiment configured in this way, in addition to being able to achieve the effects described in the second embodiment, the engagement between the protruding strip portion 82 on the guide hole 50 side and the weight portion 51 side is also possible. The engagement with the mating groove 83 allows the movement of the weight 51 in the radial direction along the guide hole 50, and the weight in any axial direction (upper and lower) with respect to the guide hole 50. Since the position of 51 can be regulated, it is possible to prevent the weight portion 51 from dropping (falling) or jumping out from the guide hole 50.
Therefore, the weight portion 51 can be stably moved in the radial direction along the guide hole 50, and the inertia moment can be easily adjusted. Moreover, since the shakiness of the weight portion 51 in the axial direction can be prevented, the balance 80 can be rotated with a better balance.

<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 second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, resistance is given to the movement of the weight portion 51, but in the fourth embodiment, the position of the weight portion 51 in the axial direction is further restricted.
In the third embodiment, an example in which the position of the weight portion 51 in the axial direction is regulated is shown. However, in the third embodiment, the protrusion 82 on the guide hole 50 side and the engagement groove on the weight portion 51 side are shown. In the fourth embodiment, the restricting portion is provided only on the guide hole 50 side.

  As shown in FIGS. 9 to 11, in the balance with hairspring 90 of the present embodiment, a bottom wall portion 91 that closes the guide hole 50 from the lower side is formed integrally with the connection bridge 56 </ b> A. As a result, the guide hole 50 of the present embodiment is a groove having an elliptical shape in plan view and long in the radial direction. Accordingly, the weight portion 51 accommodated in the guide hole 50 is movable in the radial direction while being stably supported from below by the bottom wall portion 91.

Furthermore, an annular stepped portion 92 that is recessed along the opening of the guide hole 50 is formed on the upper surface of each connection bridge 56A. A lid 93 that covers the guide hole 50 from above is attached to each connection bridge 56A by, for example, fitting and fixing to the stepped portion 92. Thereby, the weight part 51 accommodated in the guide hole 50 will be in the state pinched | interposed between the bottom wall part 91 and the cover body 93, and will move with respect to any direction (above and below) of an axial direction. Is regulated. That is, the weight part 51 is prevented from dropping (falling) and jumping out from the guide hole 50.
Therefore, in the present embodiment, the bottom wall portion 91 and the lid body 93 function as the restriction portion 94.

  The lid 93 is formed in an elliptical shape in plan view that is long in the radial direction corresponding to the shape of the stepped portion 92, and is formed with a slit-shaped adjustment window 93a extending along the radial direction. An adjustment hole 51a is formed in the weight portion 51 at a position corresponding to the adjustment window 93a, and is exposed upward through the adjustment window 93a. Accordingly, the weight 51 can be moved in the radial direction through the adjustment hole 51a through a jig (not shown) without removing the lid 93.

(Function and effect)
Even with the balance 90 of the present embodiment configured in this way, the position of the weight portion 51 in the axial direction with respect to the guide hole 50 while allowing the weight portion 51 to move in the radial direction along the guide hole 50 is allowed. Therefore, the same effect as the third embodiment can be achieved.

(Modification)
In the fourth embodiment, the weight part 51 is prevented from falling off from the guide hole 50 by the bottom wall part 91 and the protrusion from the guide hole 50 is prevented by the cover body 93. 93 is not essential. For example, as shown in FIG. 12, the lid 93 may not be provided and only the bottom wall 91 may be provided. Even in this case, the weight portion 51 in the guide hole 50 can be prevented from falling off, and the position of the weight portion 51 in the axial direction can be restricted. Therefore, in this case,
The bottom wall portion 91 functions as the restriction portion 95.

<Fifth Embodiment>
Next, a fifth embodiment of the invention will be described with reference to the drawings. In the fifth 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 weight portion 51 is merely accommodated in the guide hole 50. However, in the fifth embodiment, the weight portion 51 in the axial direction is further provided while providing resistance to the movement of the weight portion 51. Is restricted from moving.

  As shown in FIGS. 13 to 15, the balance with hairspring 100 of the present embodiment is a pair of convex wall 101 extending in the radial direction along the guide hole 50 while facing the inner wall surface 50 a of the guide hole 50 in the circumferential direction. Is formed so as to protrude toward the inner side of the guide hole 50 (in a circumferential direction orthogonal to the axial direction). Therefore, a second guide hole 102 that is long in the radial direction is defined between the pair of protruding strip walls 101.

  On the other hand, the weight part 51 of the present embodiment includes a lower weight part 51A and an upper weight part 51B connected to the lower weight part 51A so as to be separable in the axial direction.

The lower weight portion 51A projects from the lower side of the connection bridge 56A into the guide hole 50 and protrudes upward from the disk portion 104. The lower weight portion 51A projects into the second guide hole 102. And a protrusion 105 that can be inserted from below. The protrusion 105 is formed in an oval shape in plan view that is long in the radial direction, and the outer peripheral surface contacts the inner wall surface 101 a of the ridge wall 101, so that the rotation is restricted in the second guide hole 102. Accordingly, the lower weight portion 51A is prevented from rotating by the contact between the protrusion 105 and the inner wall surface 101a.
Further, a screw hole 105a that opens upward is formed in the protrusion 105 at the center of the upper end surface.

The upper weight portion 51B protrudes downward from the disk portion 106 that can be accommodated in the guide hole 50 from the upper side of the connection bridge 56A, and is screwed into the screw hole 105a. A screw shaft 107.
Therefore, by screwing the screw shaft 107 of the upper weight portion 51B into the screw hole 105a of the lower weight portion 51A, the upper weight portion 51B and the lower weight are sandwiched between the pair of convex walls 101 from above and below. The parts 51A can be combined with each other. In particular, since the lower weight portion 51A is prevented from rotating as described above, the upper weight portion 51B and the lower weight portion 51A can be easily combined.
A rotating groove 106a for easily performing the above screwing operation is formed on the upper surface of the disc portion 106 in the upper weight portion 51B.

(Function and effect)
According to the balance 100 of the present embodiment configured as described above, the tightening force for sandwiching the pair of convex wall 101 is adjusted by adjusting the screwing amount of the upper weight portion 51B with respect to the lower weight portion 51A. Therefore, the frictional resistance between the pair of ridge walls 101 and the weight portion 51 can be increased. Thereby, resistance can be given to the movement of the weight part 51. Therefore, it can suppress that the weight part 51 moves to radial direction unexpectedly, and it is easy to prescribe | regulate the position of the weight part 51 to radial direction.
In particular, in the case of the present embodiment, the movement of the weight portion 51 in the radial direction can be restricted by firmly sandwiching the pair of ridge walls 101, and the position of the weight portion 51 in the radial direction can be set at an arbitrary position. It is also possible to position.

  Furthermore, since the weight 51 composed of the lower weight 51A and the upper weight 51B sandwiches the pair of convex walls 101, the weight 51 in any axial direction (upper and lower). Can be controlled. Accordingly, it is possible to prevent the weight portion 51 from dropping (falling) and jumping out from the guide hole 50.

  As described above, in the present embodiment, the pair of ridge walls 101, the lower weight portion 51A, and the upper weight portion 51B function as a resistance applying portion that provides resistance to the movement of the weight portion 51, and in the axial direction. It also functions as a restricting part that restricts the position of the weight part 51.

  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 entire weight portion 51 is accommodated in the guide hole 50, but the present invention is not limited to this case. It suffices that at least a part of the weight portion 51 is accommodated in the guide hole 50 from the axial direction that is the thickness direction of the balance wheel 42. Even in this case, since the entire thickness of the balance wheel 42 and the weight portion 51 can be suppressed, the installation space of the balance spring 43 is hardly affected.
In this case, it is preferable that the weight portion 51 is attached from the direction opposite to the balance wheel 42 from the side on which the hairspring 43 is installed.

Moreover, in each embodiment, although the guide hole 50 was linearly formed along the radial direction, it is not limited to this case, and the shape may be freely designed as long as it extends in the radial direction. .
For example, as shown in FIG. 16, a guide hole 110 that extends in the radial direction while curving in an arc shape may be used.

In this case, the balance wheel 120 is composed of a single disc member.
That is, the balance wheel according to the present invention is not limited to the one constituted by the annular rim portion 55 shown in each embodiment and the connection member 56 having a plurality of connection bridges 56A. Thus, it may be composed of a single disk member. In any case, it is only necessary to be integrally connected to the balance stem 41 and to be rotatable around the axis O together with the balance stem 41, and the shape thereof may be appropriately changed.

Thus, even if the weight 51 is moved along the guide hole 110 by extending the guide hole 110 in the radial direction while curving, it is easy to reduce the amount of movement in the radial direction. Therefore, the amount of change in the moment of inertia per moving distance of the weight portion 51 can be suppressed, and finer adjustment of the moment of inertia can be performed.
In addition, when curving the guide hole 110, it is not restricted to circular arc shape, For example, you may curve by spiral shapes, such as Archimedes spiral shape.

In each of the above embodiments, one type of weight 51 is used, but a plurality of weights having different weights may be used.
For example, as shown in FIG. 17, the weight portion 51 may be configured by a first weight portion 130 and a second weight portion 131 that is lighter than the first weight portion 130. In this way, for example, by moving the first weight portion 130, the moment of inertia can be adjusted coarsely (largely) first, and then, by moving the light second weight portion 131, the moment of inertia is fine ( It can be used properly by adjusting to (smaller).
As described above, by properly using the first weight part 130 and the second weight part 131, it is possible to perform a finer inertia moment adjustment operation with high accuracy.

O ... Axis (rotating axis)
1 ... Mechanical watch 10 ... Movement (watch movement)
22 ... barrel wheel 28 ... front wheel train
DESCRIPTION OF SYMBOLS 30 ... Escapement mechanism 40, 60, 70, 80, 90, 100 ... Balance 41 ... Tenshin 42, 120 ... Balance wheel 50, 110 ... Guide hole 50a ... Inner wall surface of guide hole 51 ... Weight part 61, 73 ... Resistance Giving part 62 ... leaf spring (elastic body)
81, 94, 95 ... Restricting portion 82 ... Projection strip 83 ... Engaging groove 130 ... First weight portion 131 ... Second weight portion

Claims (11)

With the balance rotating around the axis,
A balance wheel connected to the balance and having a plurality of guide holes;
A weight portion movable along the guide hole,
The guide hole extends in the radial direction of the true pivot shaft and is arranged around the pivot shaft with an interval therebetween,
The weight portion is held so as to be movable in the radial direction of the rotating shaft along the guide hole in a state in which at least a part is accommodated in the guide hole from the thickness direction of the balance wheel. A balance that features The balance according to claim 1,
The balance with hairspring, wherein at least one of the weight part and the guide hole is provided with a resistance applying part for applying resistance to the movement of the weight part. The balance with hairspring according to claim 2,
The balance with hairspring, wherein the resistance applying portion is an elastic body that protrudes from the weight portion toward the inner wall surface of the guide hole and biases the weight portion against the inner wall surface of the guide hole. The balance with hairspring according to any one of claims 1 to 3,
At least one of the weight portion and the guide hole is provided with a restriction portion for restricting the position of the weight portion in the thickness direction of the balance wheel with respect to the guide hole. Totemp. The balance with hairspring according to claim 4,
The regulation part is
Projecting in a direction perpendicular to the thickness direction from the inner wall surface of the guide hole, and a ridge formed along the guide hole;
A balance with an engagement groove formed on the outer peripheral surface of the weight portion so as to be recessed along the moving direction of the weight portion and to be engaged with the ridge portion. The balance with hairspring according to any one of claims 1 to 5,
The balance with hairspring, wherein the guide hole extends linearly along the radial direction of the rotation shaft. The balance with hairspring according to any one of claims 1 to 6,
The balance with hairspring, wherein the guide hole extends in a radial direction of the rotating shaft while being curved. The balance with hairspring according to any one of claims 1 to 7,
The balance weight is characterized in that the weight portion is entirely accommodated in the guide hole. The balance with hairspring according to any one of claims 1 to 8,
The balance with a weight, wherein the weight portion includes a first weight portion and a second weight portion having a mass different from that of the first weight portion. 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 balance according to claim 1, which adjusts the speed of the escapement mechanism.   A mechanical timepiece comprising the timepiece movement according to claim 10.

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