JP2016164544A - Watch speed governor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watch speed governor that does not change or minimally changes in vibration period due to a change in properties of a balance spring with temperature increase without a stress causing a deformation of a balance wheel.SOLUTION: A watch speed governor 1 includes: a balance staff 2; a support member 4 (arm part 7) externally and radially extending from the balance staff 2; a weight member 5 that is supported by the support member 4, internally and radially extends from the supported portion, and has a large coefficient of thermal expansion according to temperature change in comparison with the support member 4; and a balance spring 3, in which the support member 4 and the weight member 5 have a moment of inertia about the balance staff 2 decreasing with temperature increase.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a speed control device used for a timepiece.

In order to obtain an accurate rate, the mechanical timepiece needs to precisely adjust the accuracy of the balance period of the balance in the speed governor. The vibration period of the balance with hairspring mainly depends on the moment of inertia around the center of rotation of the balance wheel and the spring constant of the balance spring.
When the temperature of the environment surrounding the governor increases, the spring constant of the hairspring changes in a direction that decreases. Further, when the temperature of the environment surrounding the speed governor increases, the balance wheel is deformed so as to spread outward in the radial direction, so that the inertia moment of the balance wheel is increased.
As a result, the vibration cycle of the balance with hairspring becomes longer.
Therefore, a member with a high coefficient of thermal expansion is arranged on the arm part of the balance wheel, and when the temperature rises, the arm part is expanded to distort the annular part of the balance wheel, and the part to which the weight is added is arranged. A technique has been proposed in which the moment of inertia of the balance wheel is reduced by displacing inward in the radial direction (see, for example, Patent Document 1).
According to this technique, even if the spring constant of the balance spring decreases due to an increase in temperature, the inertia moment of the balance wheel decreases, thereby preventing or suppressing a change in the vibration cycle due to an increase in temperature. it can.

JP 2013-185982 A

However, in the technique according to Patent Document 1, since the shape of the balance wheel is greatly distorted due to the expansion of the arm portion, stress is generated in the balance wheel and durability is reduced. In addition, the annular portion of the balance wheel is deformed, and there is a possibility that deviation occurs when the balance wheel rotates.
Note that the characteristics of the hairspring may change in the direction in which the spring constant increases as the temperature increases.
The present invention has been made in view of the above circumstances, and the vibration period of the speed governor changes due to a change in the characteristics of the balance spring with a change in temperature without applying a stress that causes distortion in the balance wheel. An object of the present invention is to provide a speed control device for a timepiece that can be prevented or suppressed.

The present invention provides a balance, a support member extending outwardly in the radial direction centering on the balance from the balance, a support member supported by the support member, and extending in the radial direction from the supported portion. The speed governor includes a weight member having a larger coefficient of thermal expansion corresponding to a temperature change than the support member, and a hairspring.
The weight member in the present invention may extend radially inward from the supported portion, or may extend radially outward from the supported portion.

  According to the time governor of the timepiece according to the present invention, it is possible to prevent the vibration period of the speed governor from changing due to a change in the characteristics of the balance spring accompanying a change in temperature without applying a stress that causes distortion in the balance wheel. Or it can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a speed control device (a balance) in a portable timepiece (for example, a wristwatch) according to a first embodiment (Embodiment 1) of the present invention. It is sectional drawing which shows the cross section along the AA in FIG. It is sectional drawing equivalent to FIG. 2 which shows a mode when the arm part and weight member of a supporting member are thermally expanded according to a raise of temperature, (A) shows the normal temperature state before thermal expansion, (B) Represents the state when the temperature rises from the normal temperature state. It is a top view which shows the support member which has the annular part couple | bonded with the outer edge part of all the arm parts (for example, two), and the weight member is joined to the annular part. It is a figure which shows the example which applied the weight member which has a part extended on the outer side of radial direction rather than the part supported by the supporting member instead of the weight member shown in FIG. 4, (A) is a top view, ( B) is a sectional view showing a section taken along line BB in (A). In the speed governor of 2nd Embodiment (Embodiment 2), it is sectional drawing equivalent to FIG. 2 which shows a mode when the arm part and weight member of a supporting member are thermally expanded according to the rise in temperature, ( A) shows a normal temperature state before thermal expansion, and (B) shows a state when the temperature rises from the normal temperature state. It is a perspective view which shows the flame | frame used as the supporting member in the speed governor which is the 3rd Embodiment (Embodiment 3) of this invention, and four weight members, (A) is an outer side convex part in an outer through-hole. The fitted state, (B) shows the state where the intermediate convex part is fitted into the intermediate through-hole, and (C) shows the state where the inner convex part is fitted into the inner through-hole. (A) is a top view of a frame, (B) is a side view of a weight member. It is sectional drawing in each state shown in FIG. 7, (A) respond | corresponds to the cross section along CC line of FIG. 7 (A), (B) is DD line of FIG. 7 (B). (C) corresponds to the cross section along the line EE in FIG. 7 (C). It is a perspective view which shows the flame | frame used as the supporting member in the speed governor which is the 4th Embodiment (Embodiment 4) of this invention, and four weight members. FIG. 11A is a perspective view showing a state in which the frame and the weight member are coupled by only four outer fixing screws, and FIG. 11B is a diagram in which the frame and the weight member are coupled by only four inner fixing screws. It is a perspective view which shows a state. FIG. 12 is a cross-sectional view in each state shown in FIG. 11, where (A) corresponds to a cross section taken along line FF in FIG. 11A, and FIG. Corresponds to the cross section along.

  Hereinafter, embodiments of a speed governing device according to the present invention will be described with reference to the drawings.

[Embodiment 1]
<Configuration of governor>
FIG. 1 is a perspective view showing a speed control device (balance) 1 in a portable watch (for example, a wristwatch) according to a first embodiment (Embodiment 1) of the present invention, and FIG. 2 is a line AA in FIG. It is sectional drawing which shows the cross section along line.
In FIG. 2, the balance 2 and the hairspring 3 are not shown.
The illustrated speed governor 1 includes a spring 2, a hairspring 3, a support member 4, and a weight member 5.

The balance stem 2 is rotatably supported by a base plate and a balance holder whose illustration is omitted from the top and bottom of the shaft.
The hairspring 3 has an inner end joined to the balance 2 and an outer end fixed to a balance receiver not shown.
The support member 4 is formed in a + shape in plan view. The support member 4 is made of, for example, silicon. The support member 4 is integrally formed with a base portion 6 formed in a substantially cylindrical shape at the center of the + character and four arm portions 7 extending radially around the base portion 6.

The base 6 is coupled to the stem 2 by fitting the stem 2 inside the cylindrical shape. The four arm portions 7 are arranged at equiangular intervals (angle 90 [degree] intervals) with the base 6 as the center. Accordingly, the arm portion 7 extends outward along the radial direction centering on the balance 2.
The arm portion 7 is formed in a rectangular parallelepiped box shape without an upper wall, and the four arm portions 7 have the same shape.

The weight member 5 is formed in a rectangular parallelepiped shape, and is disposed in the box-shaped space 7 a of each arm portion 7. Therefore, the weight member 5 also extends along the radial direction with the balance 2 as the center. The weight member 5 is made of, for example, copper or nickel. That is, the weight member 5 has a larger coefficient of thermal expansion in accordance with the temperature change than the support member 4. In the present embodiment, the weight member 5 is heavier than the support member 4 (particularly, the arm portion 7).
In the case of this embodiment, the thermal expansion coefficient of the weight member 5 is larger than six times the thermal expansion coefficient of the support member 4.

The weight member 5 is supported by being joined to the arm portion 7 at only one place. Specifically, the end 5 a of the weight member 5 in the radial direction with respect to the balance 2 is joined to the end 7 b of the arm 7 in the radial direction. For joining the weight member 5 and the arm portion 7, a known joining method such as adhesion by an adhesive, welding by heat, fastening by a screw, and fitting by an uneven shape can be applied. The weight member 5 is not joined to the arm portion 7 except for the outer end portion 5a.
Thereby, when the weight member 5 is thermally expanded or contracted according to a change in temperature, the outer end portion 5a supported by the arm portion 7 is used as a reference on the inner side in the radial direction. It expands and contracts without being constrained.

<Operation of governor>
Next, the operation of the speed governor 1 in the portable timepiece of this embodiment will be described.
FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing a state in which the arm portion 7 and the weight member 5 of the support member 4 are thermally expanded in response to an increase in temperature, and (A) is room temperature before thermal expansion. A state is shown, (B) represents a state when temperature rises from a normal temperature state.

  As shown in FIG. 3A, before the thermal expansion, the center of gravity G of the member combining the arm portion 7 and the weight member 5 is at a radial distance Rg from the center O of the balance 2. In the present embodiment, the single center of gravity G5 of the weight member 5 is outside the single center of gravity G7 of the arm portion 7 in the radial direction.

When the temperature rises from room temperature, as shown in FIG. 3B, the support member 4 expands in accordance with the coefficient of thermal expansion with the center O of the balance 2 as a reference, and the arm portion 7 extends radially outward. Extends to Ro. As a result, the outer end portion 7b of the arm portion 7 is displaced in the radially outer direction Ro.
The weight member 5 also expands in accordance with the coefficient of thermal expansion. However, since the outer end portion 5a of the weight member 5 is joined to the outer end portion 7b of the arm portion 7, the weight member 5 itself is outside the arm portion 7. Along with the end portion 7b, the outer end portion 7b is displaced in the radially outer direction Ro.

  On the other hand, the weight member 5 extends without being constrained in the radially inner direction Ri with reference to the outer end portion 5a supported by the arm portion 7. Since the thermal expansion coefficient of the weight member 5 is larger than the thermal expansion coefficient of the arm portion 7, the center of gravity G5 of the weight member 5 is displaced in the radial inner direction Ri, and the arm portion 7 and the weight member 5 are combined. The center of gravity G of the member is also displaced in the radially inner direction Ri.

As a result, the radial distance Rg from the center O of the balance 2 to the center of gravity G of the member combining the arm portion 7 and the weight member 5 is the corresponding distance Rg in the normal temperature state shown in FIG. Shorter than.
In other words, the speed governing device 1 of this embodiment is formed such that the center of gravity G of the support member 4 and the weight member 5 has a smaller distance Rg from the center O of the balance stem 2 as the temperature rises.
As a result, in the speed governing device 1, the moment of inertia of the support member 4 and the weight member 5 around the balance 2 becomes smaller as the temperature increases.

Generally, in the governor, as the temperature rises, the spring constant of the hairspring decreases and the vibration cycle of the governor increases.
Also in the speed governor 1 of this embodiment, the spring constant of the hairspring 3 decreases as the temperature increases.
However, the speed governing device 1 according to the present embodiment acts in the direction of shortening the vibration period of the speed governing device 1 because the moment of inertia of the support member 4 and the weight member 5 becomes smaller due to the temperature rise. As a result, the speed governor 1 prevents or suppresses a change in the vibration cycle of the speed governor 1 due to a change in the spring constant of the hairspring 3 by changing the moment of inertia of the support member 4 and the weight member 5. be able to.

  In addition, in the speed governing device 1 of the present embodiment, the support member 4 and the weight member 5 corresponding to the balance wheel are joined at only one place, so that both the support member 4 and the weight member 5 change in temperature. The stress that generates the strain due to the above does not act, or the effect of the stress is small. Therefore, the durability of the support member 4 and the weight member 5 is prevented or suppressed from being reduced by stress.

Since the weight member 5 is heavier than the support member 4 (particularly, the arm portion 7), the speed control device 1 of the present embodiment has a temperature higher than that when the weight member 5 is lighter than the support member 4. The amount of movement of the center of gravity of the member combining the weight member 5 and the support member 4 due to the ascent increases. Therefore, the speed governing device 1 of the present embodiment can expand the adjustable range of the moment of inertia as compared with the case where the weight member 5 is lighter than the support member 4.
Further, in the speed governing device 1 of the present embodiment, since the end portion 5a on the outer side in the radial direction of the weight member 5 is supported by the support member 4, the portion on the inner side in the radial direction from the end portion 5a is the support member. 4, the length of the center of gravity G5 of the weight member 5 that moves in the radial inner direction Ri can be maximized.

<Modification>
The speed control device 1 according to the present embodiment joins a support member 4 made of, for example, silicon, and a weight member 5 made of, for example, copper or nickel, so that the support member 4 and the weight are joined. The member 5 is integrated. However, the speed governor 1 is not limited to this form, and the support member 4 and the weight member 5 may be integrally formed instead of being individually formed.
As such an integral forming technique, for example, a LIGA (Lithographie (lithography), Galvanoformung (electroforming), Abformung (molding)) process using silicon as a mold can be applied.

  That is, the silicon formed in a box shape serving as the arm portion 7 by the LIGA process is used as a mold, copper is formed as an underlying electrode inside the mold, and the weight member 5 is formed on the copper electrode by electroforming. A nickel layer is grown, and then the portion of the electrode copper excluding the outer end 5a is removed, for example, by etching. Thus, the nickel weight member 5 and the silicon support member 4 (arm portion 7) are integrated with each other in a state where only the outer end portion 5a of the nickel weight member 5 is joined to the arm portion 7 via copper. Can be formed.

In the speed governor 1 of the present embodiment, the support member 4 includes four arm portions 7, but the arm portions 7 are not limited to four, and are equiangularly spaced around the center O of the balance 2. The number may be two or more, and the number in the range of 4 to 8 is preferable from the viewpoint of the balance of arrangement.
The number of the weight members 5 is preferably the same as the number of the arm portions 7, but may not be the same as the number of the arm portions 7 as long as the weight members 5 are arranged around the center O of the balance 2 at equal angular intervals.

Moreover, the arm part 7 is not limited to what extended linearly in the radial direction, and may extend in the shape of a curve.
The arm portion 7 does not have to have a box-like space 7a, and may have a thin plate shape. However, if the shape has the box-like space 7a, the weight member 5 can be disposed in the space 7a and the weight of the weight member 5 joined only at one place can be received. Moreover, since the side wall of the arm member 7 is in contact with the side surface of the weight member 5, the weight member 5 is swung in the direction perpendicular to the radial direction when moving around the center O of the balance stem 2. It can also be prevented or suppressed.

The portion of the support member 4 (arm portion 7) on which the weight member 5 is supported is not limited to the outer end portion 7b in the radial direction, as long as a space in which the weight member 5 can be disposed can be secured. Any part of the arm part 7 may be used.
FIG. 4 shows a support in which all (for example, two) arm portions 7 have an annular portion 8 coupled to an outer end portion 7 b, and a weight member 5 is joined to the annular portion 8. FIG. 6 is a plan view showing a member 14.

As shown in FIG. 4, the speed governing device 1 according to the present embodiment has a ring-shaped portion 8 coupled to the outer end portions 7 b of all the arm portions 7 instead of the support member 4. 14 may be provided, and the weight member 5 may be joined to the annular portion 8 instead of the arm portion 7. The support member 14 corresponds to a balance wheel in a conventional speed governor.
However, when there is no annular portion 8, the moment of inertia of the support member 14 itself is reduced, and the ratio of the moment of inertia of the support member 14 to the moment of inertia of the weight member 5 can be reduced. Thereby, the change of the whole inertia moment of the support member 14 and the weight member 5 by the change of temperature can be enlarged.

FIG. 5 is a diagram showing an example in which a weight member 15 having a portion extending outward in the radial direction from the portion supported by the support member 14 is applied instead of the weight member 5 shown in FIG. (A) is a top view, (B) is sectional drawing which shows the cross section along the BB line in (A).
The speed governing device 1 of the embodiment shown in FIGS. 1 and 4 has a structure in which the radially outer end 5a of the weight member 5 is joined to the support members 4 and 14, but the speed governing device 1 is As shown in FIG. 5, a portion on the inner side in the radial direction than the end portion 15 c on the outer side in the radial direction may be joined to the support member 14.

  In this case, the speed governing device 1 has an end 15b in the radial direction from the portion (projection 15a) in which the projection 15a is fitted and supported in the hole 8a of the support member 14 (annular portion 8) of the weight member 15. The length L1 of the inner portion 15d is longer than the length L2 of the outer portion 15e from the portion (protrusion 15a) supported by the support member 14 (annular portion 8) to the radially outer end portion 15c. ing.

  As the temperature rises, the inner portion 15d extends in the radial inner direction Ri with reference to the supported portion, so that the center of gravity Gd moves in the radial inner direction Ri. On the other hand, as the temperature rises, the outer portion 15e extends toward the radially outer direction Ro with the supported portion as a reference, so that the center of gravity Gd moves in the radially outer direction Ro.

  As the temperature rises, the portion (protrusion 15a) on which the weight member 15 is supported moves in the radially outward direction Ro as the support member 14 (annular portion 8) expands. The length L1 of the inner portion 15d and the outer portion 15e are such that the entire center of gravity of the support member 14 and the weight member 15 moves in the inner direction Ri regardless of the movement of the supported portion in the outer direction Ro. By setting the length L2, the speed governor 1 can also reduce the moment of inertia due to the temperature rise.

  Note that the weight member in the present invention may have the outer portion 15e as in the weight member 15 in FIG. 5, but does not have the outer portion 15e (at the end portion in the radial direction of the weight member). The form supported by the support member: the weight member 5) shown in FIGS. 1 and 4 is preferable because the amount of movement of the center of gravity of the weight member in the radial inner direction Ri due to the temperature rise increases.

  The speed control device 1 of the above-described embodiment has a uniform shape in the radial direction of the weight members 5 and 15, but is not limited to a uniform shape, and the width becomes wider toward the inside in the radial direction, It is also possible to adopt a shape in which the thickness increases or the weight increases. Thus, according to the weight member whose shape increases in weight toward the inner side in the radial direction, the amount of movement of the center of gravity to the inner side in the radial direction due to a rise in temperature is reduced to a weight having a uniform width and thickness. It can be made larger than the amount of movement of the center of gravity by the member.

  The speed governing device 1 of the above-described embodiment is formed such that the center of gravity G of the support member 4 and the weight member 5 has a smaller distance Rg from the center O of the balance stem 2 as the temperature increases. The distance Rg may be formed so as not to change due to a temperature rise. Further, the speed governing device 1 has an amount of movement of the support member 4 and the weight member 5 to the outside of the center of gravity G compared to the amount of movement of the support member 4 (arm portion 7) alone to the outside of the center of gravity G7 due to temperature rise. You may form so that it may become small. In these cases, the moments of inertia of the support member 4 and the weight member 5 do not decrease as the temperature increases, but the rate of increase of the moment of inertia with respect to the temperature rise is the ratio of the support member 4 (arm portion 7) alone. It becomes smaller than the rate of increase of the moment of inertia. Therefore, the change in the characteristics of the speed governor 1 due to the temperature rise can be suppressed.

The embodiment and the modification described above are cases where the temperature rises, but when the temperature falls, the spring constant of the hairspring 3 increases as the temperature falls, contrary to the case where the temperature rises. The moment of inertia of the support member 24 and the weight member 25 increases as the temperature decreases.
As described above, the speed control device 1 according to the present embodiment and the modified example increases the moment of inertia of the support member 24 and the weight member 25 even when the temperature decreases, thereby adjusting the spring constant of the hairspring 3 by increasing the moment of inertia. The change of the vibration cycle of the speed device 1 can be prevented or suppressed.

[Embodiment 2]
6 shows a state in which the arm portion 27 and the weight member 25 of the support member 24 in the speed governor 21 of the second embodiment (Embodiment 2) are thermally expanded as the temperature rises. It is considerable sectional drawing, (A) shows the normal temperature state before thermal expansion, (B) represents the state when temperature rises from a normal temperature state. In FIG. 6, G27 indicates the center of gravity of the support member 24 (particularly the arm portion 27), G25 indicates the center of gravity of the weight member 25, and G indicates the center of gravity of the support member 24 and the weight member 25.

  In the speed control device 1 according to the first embodiment and the modified example described above, the hairspring 3 has a characteristic that the spring constant decreases as the temperature rises. 6 is applicable as an embodiment of the speed governing device according to the present invention. The speed governing device 21 shown in FIG.

That is, the speed governor 21 shown in FIG. 6 applies the support member 24 instead of the support member 4 shown in FIG. 3, applies the weight member 25 instead of the weight member 5, and the hairspring 3 has the temperature It has a characteristic that the spring constant is increased by the increase of.
The arm portion 27 of the support member 24 extends outward in the radial direction with the balance 2 (see FIG. 1) as the center. The arm portion 27 is formed with an inner peripheral wall 27a at a portion near the end portion on the inner peripheral side.

The weight member 25 is supported by being joined to the arm portion 27 at only one place. Specifically, the end 25 b of the weight member 25 that is radially inward of the balance 2 is joined to the inner peripheral wall 27 a of the arm 27. Thereby, when the weight member 25 is thermally expanded or contracted according to a change in temperature, the inner end 25b supported by the arm 27 is used as a reference, and the weight member 25 is radially outward with respect to the arm 27. It expands and contracts without being constrained.
According to the speed control device 21 configured as described above, the distance Rg from the center O of the balance 2 of the center of gravity G of the support member 24 and the weight member 25 is higher than that in the normal temperature state (FIG. 6A). It becomes larger in the raised state (FIG. 6B).

The rate of increase in the distance Rg is greater than the rate of increase in the distance of the center of gravity G27 of the support member 24 alone.
Therefore, in the speed governor 21, the moment of inertia of the support member 24 and the weight member 25 centering on the balance 2 increases as the temperature rises, and the rate at which this moment of inertia increases is the support member 24 alone. The moment of inertia is larger than the ratio.

As described above, the speed governor 21 according to the present embodiment supports the support member even if the vibration period of the speed governor 21 is shortened by increasing the spring constant of the hairspring 3 due to an increase in temperature. It is possible to prevent or suppress the vibration period of the speed governor 21 from being shortened by increasing the moment of inertia of the weight member 25 and the weight member 25.
Note that the speed governor 21 of the present embodiment supports the support member even when attempting to change the vibration period of the speed governor 21 in the direction of increasing by decreasing the spring constant of the mainspring 3 when the temperature decreases. It is possible to prevent or suppress an increase in the vibration period of the speed governor 21 due to a decrease in the moment of inertia of 24 and the weight member 25.

[Embodiment 3]
The speed control device according to the present invention may change the portion of the weight member supported by the support member without changing the moment of inertia at a specific temperature (for example, normal temperature). That is, the weight member is provided with a plurality of portions (supported candidate portions) that are candidates to be supported by the support member, and by selecting one of the supported candidate portions as the supported portion, The length from the supported portion to the free end can be changed, and the degree of change in the moment of inertia caused by the temperature change can be adjusted.

  FIG. 7 is a perspective view showing a frame 34 serving as a support member and four weight members 35 in the speed governor 31 according to the third embodiment (Embodiment 3) of the present invention, and FIG. A state where the convex portion 35a is fitted into the outer through hole 39a, (B) is a state where the intermediate convex portion 35b is fitted into the intermediate through hole 39b, and (C) is a state where the inner convex portion 35c is fitted into the inner through hole 39c. Each state.

As shown in FIG. 7, the speed governor 31 according to the third embodiment includes a frame 34 and a weight member 35, and further includes a hairspring and a balance spring. The balance spring and the balance spring are not different from the balance spring 3 and the balance spring 2 in the speed governor 1 of the first embodiment, and thus illustration and description thereof are omitted.
8A is a plan view of the frame 34, and FIG. 8B is a side view of the weight member 35.

The frame 34 is made of, for example, silicon. As shown in FIG. 8A, the base 34 is formed in a substantially cylindrical shape at the center, and a base 36 to which the balance is fixed, and an angle 90 [ Degrees] and four arms 37 extending radially in the radial direction at intervals.
The frame 34 connects the outer ends of the four arms 37, an annular inner rim 38 c centered on O, an intermediate rim 38 b concentric with the inner rim 38 c and formed outside the inner rim 38 c, An outer rim 38a is formed concentrically with the intermediate rim 38b and formed outside the intermediate rim 38b.

Here, the arm 37 and the inner rim 38 c are joined by a first joint 39 h formed at the outer end of each arm 37. Further, the inner rim 38c and the intermediate rim 38b are joined to the first joints 39h by four second joints 39g formed at positions shifted by an angle θ around the center O.
Further, the intermediate rim 38b and the outer rim 38a are joined to each second joint 39g by four third joints 39f formed at positions shifted by an angle θ around the center O.

The angle θ is not limited to a specific value, but is set so that the first joint portion 39h, the second joint portion 39g, and the third joint portion 39f do not line up in a straight line in the radial direction. In this example, the angle θ is set so as not to be a multiple of 90 [degrees] in addition to 0 [degree], and is set to 30 [degrees], for example.
Through holes 39a, 39b, and 39c (joint structures) are formed in the joint portions 39f, 39g, and 39h, respectively. These three through holes 39a, 39b, and 39c are support candidate portions that support the weight member 35 at three positions at different distances from the center O in the radial direction.
The through hole 39a may be referred to as an outer through hole 39a, the through hole 39b may be referred to as an intermediate through hole 39b, and the through hole 39c may be referred to as an inner through hole 39c.

The weight member 35 is made of, for example, copper, and has a larger coefficient of thermal expansion corresponding to a change in temperature than the frame 34 made of, for example, silicon.
As shown in FIG. 8B, the weight member 35 is formed in a rectangular plate shape, and on the lower surface, three convex portions 35a as supported candidate portions to be fitted in correspondence with the through holes 39a, 39b, 39c. , 35b, 35c (bonding structure) are formed.
Of the three convex portions 35a, 35b, and 35c, the convex portion 35c near the free end 35d on the left side of the drawing (hereinafter referred to as the inner free end 35d) is the inner convex portion 35c, and the middle convex portion 35b is the intermediate convex portion 35b. The convex portion 35a close to the free end 35e on the right side of the drawing (hereinafter referred to as the outer free end 35e) may be referred to as the outer convex portion 35a.

Here, the interval between the convex portion 35a and the convex portion 35b is the same as the difference in the radial distance between the through hole 39a and the through hole 39b with O as the center. Similarly, the distance between the convex portion 35b and the convex portion 35c is the same as the difference in the radial distance between the through hole 39b and the through hole 39c with O as the center.
One of the three through holes 39a, 39b, 39c selected as a support portion, and one convex portion corresponding to the selected one through hole 39a, 39b, 39c 35a, 35b, and 35c are supported parts.

One of the through-holes 39a (or the through-holes 39b and 39c) selected as the support part is a supported part corresponding to the through-hole 39a (or the through-holes 39b and 39c). By fitting the two convex portions 35 a (or the convex portions 35 b and 35 c), the frame 34 and the weight member 35 are coupled and the weight member 35 is supported by the frame 34.
Specifically, the outer convex portion 35a corresponds to the outer through hole 39a, the intermediate convex portion 35b corresponds to the intermediate through hole 39b, and the inner convex portion 35c corresponds to the inner through hole 39c.
9 is a cross-sectional view in each state shown in FIG. 7, where (A) corresponds to a cross section taken along line CC in FIG. 7 (A), and (B) is a cross-sectional view taken along line D in FIG. 7 (B). Corresponding to the cross section along line -D, (C) corresponds to the cross section along line EE in FIG.

  When the outer through hole 39a is selected as shown in FIG. 7 (A), the weight member 35 in a posture extending in the radial direction in a state where the outer convex portion 35a is fitted and coupled to the outer through hole 39a, As shown in FIG. 9A, the other convex portions 35 b and 35 c are not restrained by the frame 34. That is, the weight member 35 is supported by the frame 34 only by the outer convex portion 35a.

  Therefore, when the weight member 35 expands and contracts due to a rise in temperature, the inner free end 35d extends inward in the radial direction with reference to the outer protrusion 35a, and the center of gravity of the weight member 35 moves inward in the radial direction. On the other hand, the frame 34 extends outward in the radial direction with respect to the center O. However, since the thermal expansion coefficient of the weight member 35 is larger than the thermal expansion coefficient of the frame 34, the inner free end 35d of the weight member 35 is The entire mass distribution of the frame 34 and the weight member 35 moves in a direction approaching the center O.

As a result, the entire moment of inertia of the frame 34 and the weight member 35 becomes smaller than before the temperature rise.
Therefore, when the spring constant of the hairspring has a temperature characteristic that decreases with an increase in temperature, the vibration period of the hairspring increases with an increase in temperature, but the entire frame 34 and the weight member 35 with an increase in temperature. Therefore, the rate of the speed governor 31 is adjusted in a direction that cancels the temperature characteristics of the hairspring.

  When the intermediate through hole 39b is selected as shown in FIG. 7B, the weight member 35 in a posture extending in the radial direction with the intermediate convex portion 35b fitted and coupled to the intermediate through hole 39b is As shown in FIG. 9B, the other convex portions 35 a and 35 c are not restrained by the frame 34. That is, the weight member 35 is supported by the frame 34 only by the intermediate convex portion 35b.

Therefore, when the weight member 35 expands and contracts due to a rise in temperature, the inner free end 35d extends inward in the radial direction and the outer free end 35e extends outward in the radial direction with the intermediate protrusion 35b as a reference. Since the distance R2 from the intermediate convex portion 35b to the inner free end 35d is longer than the distance R3 from the intermediate convex portion 35b to the outer free end 35e, the center of gravity of the weight member 25 moves in a direction approaching the center O.
On the other hand, the frame 34 extends outward in the radial direction with respect to the center O. However, since the thermal expansion coefficient of the weight member 35 is larger than the thermal expansion coefficient of the frame 34, the entire frame 34 and the weight member 35 are arranged. The mass distribution moves toward the center O.

As a result, the entire moment of inertia of the frame 34 and the weight member 35 becomes smaller than before the temperature rise.
Therefore, when the spring constant of the hairspring has a temperature characteristic that decreases with an increase in temperature, the vibration period of the hairspring increases with an increase in temperature, but the entire frame 34 and the weight member 35 with an increase in temperature. Therefore, the rate of the speed governor 31 is adjusted in a direction that cancels the temperature characteristics of the hairspring.

  When the inner through hole 39c is selected as shown in FIG. 7C, the weight member 35 in the posture extending in the radial direction with the inner convex portion 35c fitted and coupled to the inner through hole 39c is As shown in FIG. 9C, the other convex portions 35 a and 35 b are not restrained by the frame 34. That is, the weight member 35 is supported by the frame 34 only by the inner convex portion 35c.

Therefore, when the weight member 35 expands and contracts due to a rise in temperature, the inner free end 35d extends inward in the radial direction with the inner convex portion 35c as a reference, and the outer free end 35e extends outward in the radial direction. Since the distance R4 from the inner convex portion 35c to the inner free end 35d is longer than the distance R5 from the inner convex portion 35c to the outer free end 35e, the center of gravity of the weight member 25 moves in a direction approaching the center O.
On the other hand, the frame 34 extends outward in the radial direction with respect to the center O. However, since the thermal expansion coefficient of the weight member 35 is larger than the thermal expansion coefficient of the frame 34, the entire frame 34 and the weight member 35 are arranged. The mass distribution moves toward the center O.

As a result, the entire moment of inertia of the frame 34 and the weight member 35 becomes smaller than before the temperature rise.
Therefore, when the spring constant of the hairspring has a temperature characteristic that decreases with an increase in temperature, the vibration period of the hairspring increases with an increase in temperature, but the entire frame 34 and the weight member 35 with an increase in temperature. Therefore, the rate of the speed governor 31 is adjusted in a direction that cancels the temperature characteristics of the hairspring.

  Here, in the speed governor 31 according to the third embodiment, a portion where the frame 34 and the weight member 35 are coupled is outside at a normally used temperature (a temperature at which a reference state without expansion and contraction, for example, room temperature). Whether it is a combination of the through hole 39a and the outer convex part 35a, a combination of the intermediate through hole 39b and the intermediate convex part 35b, or a combination of the inner through hole 39c and the inner convex part 35c Regardless, the position of the weight member 35 in the radial direction of the frame 34 is the same. Therefore, the overall moment of inertia of the frame 34 and the weight member 35 in the three combinations described above is the same.

On the other hand, in the three combinations described above, the degree of reduction in the moment of inertia when the temperature is increased differs depending on the portion to be coupled.
That is, in the state where the temperature has risen, when the outer through hole 39a and the outer convex portion 35a are coupled, the distance R1 from the portion serving as a reference for elongation (the outer convex portion 35a) to the inner free end 35d is different. The longest compared to the combination. Moreover, the distance from the part (outer convex part 35a) used as the reference | standard of elongation to the outer side free end 35e is substantially zero. Therefore, when the outer through-hole 39a and the outer convex portion 35a are coupled, the degree of inertia moment is the largest as compared with the other combinations.

  Further, when the inner through hole 39c and the inner convex portion 35c are coupled, the distance R4 from the portion serving as a reference for elongation (the inner convex portion 35c) to the inner free end 35d is compared to the case of other combinations. Shortest. Moreover, the distance R5 from the portion serving as the reference for elongation (inner convex portion 35c) to the outer free end 35e is the longest compared to other combinations. Therefore, when the inner through-hole 39c and the inner convex portion 35c are coupled, the degree of reduction of the moment of inertia is the smallest as compared with other combinations.

  Further, when the intermediate through hole 39b and the intermediate convex portion 35b are coupled, the distance R2 from the portion serving as a reference for elongation (intermediate convex portion 35b) to the inner free end 35d is an intermediate between the above two combinations. Become length. In addition, the distance R3 from the portion serving as a reference for elongation (intermediate convex portion) to the outer free end 35e is also an intermediate length between the above two combinations. Therefore, when the intermediate through-hole 39b and the intermediate convex portion 35b are coupled, the degree of decrease in the moment of inertia becomes an intermediate degree in the case of other combinations.

  Thus, according to the speed governor 31 of the third embodiment, a combination of the through holes 39a, 39b, and 39c and the convex portions 35a, 35b, and 35c corresponding to the through holes 39a, 39b, and 39c is selected. Accordingly, it is possible to select a variation of the moment of inertia suitable for canceling the variation of the rate due to the temperature characteristic of the balance spring in which the frame 34 and the weight member 35 are combined. Therefore, the rate adjusting operation of the speed governor 31 can be facilitated.

  Since the through holes 39a, 39b, 39c and the projections 35a, 35b, 35c are detachable, the three combinations described above are tested and the most suitable combination is confirmed. What is necessary is just to fix both by apply | coating an adhesive etc. to the hole 39a (or the through-hole 39b, the through-hole 39c), and the convex part 35a (or the convex part 35b, the convex part 35c).

Further, the speed governor 31 of the third embodiment can also join the weight member 35 to the frame 34 in the opposite direction inside and outside. That is, in FIG. 9, the through hole 39 a and the convex portion 35 c are arranged such that the inner free end 35 d of the weight member 35 faces the outer side in the radial direction and the outer free end 35 e of the weight member 35 faces the inner side in the radial direction. It is possible to join, or join the through hole 39b and the convex part 35b, or join the through hole 39c and the convex part 35a.
In this case, when the hairspring has a temperature characteristic in which the vibration period is shortened due to a rise in temperature, the governor 31 uses the overall moment of inertia of the frame 34 and the weight member 35 as the temperature characteristic of the hairspring. It is possible to adjust in a direction to cancel the fluctuation of the rate due to.

  The speed adjusting device 31 according to the third embodiment includes a through hole 39a, 39b, and 39c as an example of a coupling structure in which a frame 34 and a weight member 35, which are support members, couple the frame 34 and the weight member 35 to each other. Since the convex portions 35a, 35b, and 35c are provided as a part thereof, it is not necessary to separately provide a coupling member that couples the frame 34 and the weight member 35.

[Embodiment 4]
The speed adjusting device 31 according to the third embodiment includes a through hole 39a, 39b, and 39c as an example of a coupling structure in which a frame 34 and a weight member 35, which are support members, couple the frame 34 and the weight member 35 to each other. Convex portions 35a, 35b, and 35c are included as a part thereof.
However, in the speed governor according to the present invention, the support member and the weight member may not have a coupling structure as a part of itself. That is, the speed governor according to the present invention may include a coupling member that couples the support member and the weight member separately from the support member and the weight member.

FIG. 10 is a perspective view showing a frame 44 serving as a support member and four weight members 45 in the speed governor 40 according to the fourth embodiment (Embodiment 4) of the present invention.
As shown in FIG. 10, the speed governor 40 according to the fourth embodiment includes a frame 44 and a weight member 45, and in addition to these, a hairspring and a balance spring. The balance spring and the balance spring are not different from the balance spring 3 and the balance spring 2 in the speed governor 1 of the first embodiment, and thus illustration and description thereof are omitted.

  The frame 44 is made of, for example, silicon, and is formed in a substantially cylindrical shape at the center. The base 46 is fixed to the stem, the ring-shaped rim 48 is centered on the center O of the base 46, and the center O is around the center O. And four arms 49 extending radially inward from the rim 48 at an angle of 90 degrees.

Each of the four arms 49 has a through hole 49 a formed at a position far from the center O in the radial direction and a through hole 49 b formed at a position close to the center O. These two through holes 49a and 49b serve as support candidate portions that support the weight member 45 at two positions at different distances from the center O in the radial direction.
Hereinafter, the through hole 49a may be referred to as an outer through hole 49a, and the through hole 49b may be referred to as an inner through hole 49b.
Each through hole 49a, 49b is formed with a female screw to which fixing screws 41, 42 described later are combined.

The weight member 45 is made of, for example, copper, and has a larger coefficient of thermal expansion corresponding to a change in temperature than the frame 44 made of, for example, silicon.
The weight member 45 is formed in a rectangular plate shape, and through holes 45a and 45b corresponding to the through holes 49a and 49b are formed.
Hereinafter, the through hole 45a may be referred to as an outer through hole 45a, and the through hole 45b may be referred to as an inner through hole 45b.

Here, the interval between the through hole 45a and the through hole 45b is the same as the interval between the through hole 49a and the through hole 49b.
Any one of the two through holes 49a and 49b is used as a supporting portion, and one through hole 45a and 45b corresponding to the selected one through hole 49a and 49b is supported. Part.
Further, the speed governing device 40 fixes the through-hole 49a or the through-hole 49b serving as the supporting portion and the through-hole 45a or the through-hole 45b serving as the supported portion separately from the frame 44 and the weight member 45. Screws 41 and 42 (coupling members) are provided.

Hereinafter, the fixing screw 41 may be referred to as an outer fixing screw 41, and the fixing screw 42 may be referred to as an inner fixing screw 42.
The outer fixing screw 41 corresponds to the outer through hole 49a of the frame 44 and the outer through hole 45a of the weight member 45, and the outer through hole of the frame 44 passes through the outer through hole 45a of the weight member 45 from the weight member 45 side. Fastened with the female screw 49a. Thereby, the frame 44 and the weight member 45 are coupled.

The inner fixing screw 42 corresponds to the inner through hole 49b of the frame 44 and the inner through hole 45b of the weight member 45. The inner through hole of the frame 44 passes through the inner through hole 45b of the weight member 45 from the weight member 45 side. Fastened with a female screw formed in 49b. Thereby, the frame 44 and the weight member 45 are coupled.
The outer fixing screw 41 is formed with a smaller mass than the inner fixing screw 42. The outer fixing screw 41 and the inner fixing screw 42 differ only in the size of their heads, and the shaft portion and the screw portion may be the same.

11A is a perspective view showing a state in which the frame 44 and the weight member 45 are coupled only by the four outer fixing screws 41, and FIG. 11B shows the frame 44 only by the four inner fixing screws 42. It is a perspective view which shows the state with which the weight member 45 was couple | bonded.
In the governor 40, the frame 44 and the weight member 45 are not coupled to each other by both the outer fixing screw 41 and the inner fixing screw 42, but four outer fixing screws as shown in FIG. The frame 44 and the weight member 45 are coupled only by the screws 41, or the frame 44 and the weight member 45 are coupled only by the four inner fixing screws 42 as shown in FIG. 11B.

  The outer fixing screw 41 and the weight member 45 in a state where the outer fixing screw 41 is fastened to the outer through hole 49a of the frame 44 through the outer through hole 45a of the weight member 45 (see FIG. 11A). And the entire moment of inertia of the frame 44 and the inner fixing screw 42 in a state where the inner fixing screw 42 is fastened to the inner through hole 49b of the frame 44 through the inner through hole 45b of the weight member 45 (see FIG. 11B). The mass difference between the outer fixing screw 41 and the inner fixing screw 42 is set so that the inertia moments of the fixing screw 42, the weight member 45, and the frame 44 are the same.

12 is a cross-sectional view in each state shown in FIG. 11, where (A) corresponds to a cross section taken along line FF in FIG. 11 (A), and (B) is a cross-sectional view along G in FIG. 11 (B). Corresponds to a cross section along line G.
First, as shown in FIG. 11A, a case where the frame 44 and the weight member 45 are coupled to each other by the outer fixing screw 41 at the outer through hole 49a and the outer through hole 45a will be described.

  In this case, when the weight member 45 extends due to a rise in temperature, as shown in FIG. 12 (A), the inner free end 45c extends radially inward with the outer through hole 45a as a reference, and the outer through hole 45a is As a reference, the outer free end 45d extends outward in the radial direction. Since the distance from the outer through hole 45a to the outer free end 45d is substantially zero compared to the distance R6 from the outer through hole 45a to the inner free end 45c, the center of gravity of the weight member 45 moves inward in the radial direction.

  On the other hand, the frame 44 extends outward in the radial direction with respect to the center O. However, since the thermal expansion coefficient of the weight member 45 is larger than the thermal expansion coefficient of the frame 44, the inner free end 45c of the weight member 45 is The entire mass distribution of the frame 44, the weight member 45, and the outer fixing screw 41 moves in a direction approaching the center O.

As a result, the entire moment of inertia of the frame 44, the weight member 45, and the outer fixing screw 41 becomes smaller than before the temperature rise.
Therefore, when the spring constant of the hairspring has a temperature characteristic that decreases with an increase in temperature, the vibration period of the hairspring becomes longer due to the increase in temperature, but the frame 44 and the weight member 45 are fixed to the outside due to the increase in temperature. Since the overall moment of inertia with the screw 41 becomes small, the rate of the speed governor 40 is adjusted in a direction to cancel the temperature characteristic of the hairspring.

  Next, as shown in FIG. 11B, a case where the frame 44 and the weight member 45 are coupled to each other by the inner fixing screw 42 at the inner through hole 49b and the inner through hole 45b will be described.

In this case, when the weight member 45 extends due to the temperature rise, as shown in FIG. 12B, the inner free end 45c extends radially inward with the inner through hole 45b as a reference, and the outer free end 45d Extends radially outward. Since the distance R7 from the inner through hole 45b to the inner free end 45c is shorter than the distance R8 from the inner through hole 45b to the outer free end 45d, the center of gravity of the weight member 45 moves in a direction away from the center O.
As a result, the entire mass distribution of the frame 44, the weight member 45, and the inner fixing screw 42 moves away from the center O.

As a result, the entire moment of inertia of the frame 44, the weight member 45, and the inner fixing screw 42 becomes larger than before the temperature rises.
Therefore, when the spring constant of the hairspring has a temperature characteristic that increases as the temperature rises, the vibration period of the hairspring becomes shorter as the temperature rises, but the frame 44 and the weight member 45 are fixed to the inner side due to the temperature rise. Since the entire moment of inertia with the screw 42 is increased, the rate of the speed governor 40 is adjusted in a direction to cancel the temperature characteristic of the hairspring.

  Here, in the speed governing device 40 of the fourth embodiment, the frame 44 and the weight member 45 are moved by the outer fixing screw 41 at a normally used temperature (a temperature at which a reference state without expansion and contraction, for example, room temperature). Regardless of whether the combination is a combination of the outer through hole 49a and the outer through hole 45a or a combination of the inner through hole 49b and the inner through hole 45b by the inner fixing screw 42, The overall moment of inertia of the weight member 45 and the outer fixing screw 41 or the inner fixing screw 42 is the same.

On the other hand, in the two combinations described above, the direction of change of the moment of inertia when the temperature is increased is opposite between the two.
As described above, according to the speed governor 40 of the fourth embodiment, the through holes 49a and 49b of the frame 44, the through holes 45a and 45b of the weight member 45 corresponding to the through holes 49a and 49b, and the fixing screw A combination with 41 and 42 can be selected. As a result, it is possible to select a variation in the moment of inertia suitable for canceling the variation in the rate due to the temperature characteristic of the hairspring in which the frame 44, the weight member 45, and the fixing screw 41 or the fixing screw 42 are combined. Therefore, the rate adjusting operation of the speed governor 40 can be facilitated.

  Since the combination of the through holes 49a, 49b, the through holes 45a, 45b and the fixing screw 41 or the fixing screw 42 is detachable, after the above two combinations are tried and a suitable combination is confirmed, The through hole 49a (or the through hole 49b), the through hole 45a (or the through hole 45b), and the fixing screw 41 (or the fixing screw 42) combined by the combination are fixed by applying an adhesive or the like. Just do it.

In addition, since the speed control device 40 of the fourth embodiment is coupled to the frame 44 and the weight member 45 by the fixing screw 41 or the fixing screw 42 separately from the frame 44 and the weight member 45, There is no need to form a coupling structure for coupling the weight member 45 to each other.
In addition, the balance spring in the speed control devices 1, 21, 31, and 40 according to the above-described embodiments and modifications may be formed of, for example, a metal other than that formed of silicon.

DESCRIPTION OF SYMBOLS 1 Speed governor 2 Scale 4 Support member 5 Weight member 5a, 7b End part 6 Base part 7 Arm part 7a Space G, G5, G7, Gd Center of gravity O Center Rg Distance Ri Inner direction Ro Outer direction

Claims (10)

Tenshin,
A support member extending outwardly in the radial direction centered on the balance from the balance;
A weight member that is supported by the support member, extends in the radial direction from the supported portion, and has a large coefficient of thermal expansion corresponding to a temperature change compared to the support member
A speed governor equipped with a hairspring. The support member has a plurality of support candidate portions that support the weight member at a plurality of different positions in the radial direction,
The weight member has a plurality of supported candidate portions corresponding to the plurality of support candidate portions,
One of the plurality of support candidate portions selected as a support candidate portion is set as a support portion, and one of the supported portions corresponding to one selected support candidate portion is set as a supported portion. The speed control device according to claim 1, wherein the weight member is supported by the support member by being coupled to a supported portion.   The speed control device according to claim 2, wherein the support candidate portion and the supported candidate portion have a coupling structure that couples to each other when both are combined. The support member and the supported member are combined with the support member and the supported member, and the support member and the weight member are provided as separate members.
A plurality of the coupling members are prepared such that the mass of the candidate support portion to be coupled as the support portion becomes smaller as the position of the candidate support portion is farther from the center of the balance, and of the plurality of coupling members having different masses, the support rear portion The speed governing device according to claim 2, which is provided alternatively according to the position of.   The speed control device according to any one of claims 1 to 4, wherein the weight member extends inward in the radial direction from the supported portion.   The speed control device according to claim 5, wherein the moment of inertia of the support member and the weight member centered on the balance is reduced so as to increase with temperature.   The weight member is supported by the support member at a position where the length of the entire length extending in the radial direction to the inner end portion in the radial direction is longer than the length to the outer end portion in the radial direction. The speed governing device according to any one of claims 1 to 6.   8. The speed control device according to claim 1, wherein the weight member has an end portion on the outer side in the radial direction supported by the support member. 9.   The speed control device according to any one of claims 1 to 4, wherein the weight member extends outward in the radial direction from the supported portion. The speed control device according to claim 1, wherein the weight member is heavier than the support member.