JP6579696B2 - Machine part, method for manufacturing machine part, movement and watch - Google Patents

Description

  The present invention relates to a machine part, a machine part manufacturing method, a movement, and a timepiece.

A precision machine such as a mechanical timepiece uses mechanical parts such as gears that rotate around a shaft member.
As a coupling structure between a mechanical component and a shaft member, there is a structure in which a press-fit portion made of metal is formed in a through hole of the mechanical component, and the shaft member is press-fitted and fixed to the press-fit portion (for example, Patent Document 1). reference).
Since this type of mechanical component is formed thin, it is easily affected by the stress generated when the shaft member is press-fitted, but the mechanical component having the press-fit portion can relieve the stress by the press-fit portion.
In the mechanical part described in Patent Document 1, a metal film is formed on the entire surface by plating, and a portion of the metal film formed on the inner surface of the through hole functions as a press-fitting portion that relieves stress due to press-fitting of the shaft member. Can do.

JP 11-304956 A

However, the mechanical component has the following drawbacks because the metal film on the inner surface of the through hole is formed by plating.
When the metal film is thin, the amount of plastic deformation of the metal film is reduced, and particularly when a brittle material (ceramic material or the like) is used for a machine part, breakage easily occurs. Further, the metal film may be peeled off from the inner surface of the through hole. Film peeling can cause axial misalignment. Furthermore, the mechanical parts having the above-described structure have a problem that rotational looseness is likely to occur.
In addition, since the metal film is formed on the entire surface of the machine part, if the metal film on the inner surface of the through hole is thickened, the metal film on the outer peripheral surface is also thickened and the outer diameter of the machine part is increased. The relationship with the parts could be adversely affected.
The present invention has been made in view of the above-described circumstances, and is a mechanical component capable of firmly fixing a press-fit portion to a shaft member, obtaining a sufficient buffering effect, and improving dimensional accuracy. An object of the present invention is to provide a method of manufacturing a machine part, a movement, and a timepiece.

  The present invention is a mechanical component that rotates around a shaft member, and is formed on a component main body having a through hole through which the shaft member is inserted, and an inner surface of the through hole, and the shaft member is press-fitted. An anchor structure that regulates displacement of the press-fitting portion with respect to the component main body by holding at least a part of the press-fitting portion on the inner surface of the through-hole. A holding recess is formed, and the press-fitting portion provides a mechanical component formed of a metal material.

According to this configuration, since the holding recess that is an anchor structure that restricts the displacement of the press-fitting portion is formed in the component main body, the fixing strength of the press-fitting portion with respect to the component main body is increased, and rotation loosening during the operation of the machine component is prevented. It can be hard to happen. Therefore, the torque of the shaft member can be reliably transmitted to the component main body, and the timekeeping accuracy of the timepiece using this mechanical component can be improved.
In addition, since at least a part of the press-fit portion is held in the holding recess, the radial dimension (thickness) of the press-fit portion can be increased in this portion. For this reason, sufficient press-fitting allowance can be ensured and the buffering effect can be enhanced. Therefore, even when a brittle material is used for the component main body, it is possible to prevent the mechanical component from being damaged by the stress when the shaft member is press-fitted.
Moreover, since the radial dimension (thickness) of the press-fit portion can be increased, the press-fit portion can be hardly peeled off.
Furthermore, since the press-fit portion is made of a metal material, it can be formed by electroforming. As a result, the press-fit portion can be formed without attaching the metal material to the outer peripheral surface of the component main body, so that the outer diameter of the mechanical component does not increase. Therefore, the dimensional accuracy of the machine parts can be increased and the timekeeping accuracy of the timepiece can be improved.

It is preferable that the holding recess restricts the press-fitting portion from being displaced inward by making the width dimension at the first position smaller than the width dimension at the second position on the outer peripheral side from the first position. .
According to this configuration, it is possible to further increase the fixing strength of the press-fitting portion with respect to the component main body, and prevent rotational loosening during operation of the mechanical component.

It is preferable that the holding recess has a receiving step portion in which a circumferential dimension increases discontinuously outward, and the press-fitting portion has a contact step portion that contacts the receiving step portion. .
According to this configuration, it is possible to further increase the fixing strength of the press-fitting portion with respect to the component main body, and prevent rotational loosening during operation of the mechanical component.

The press-fitting part is preferably divided at at least one place in the circumferential direction of the component main body.
According to this configuration, displacement of the press-fit portion in the circumferential direction is less likely to occur, the fixing strength of the press-fit portion with respect to the component main body is further increased, and loosening of rotation during operation of the mechanical component can be prevented.

It is preferable that the component main body is formed with a receiving concave portion that receives a bulging deformed portion of the press-fitting portion that is generated when the shaft member is press-fitted.
According to this structure, the stress accompanying the press-fitting of the shaft member can be relaxed. Therefore, it is difficult for excessive force to be applied to the component main body, and damage to the component main body can be reliably prevented.

It is preferable that a part of the press-fitting portion protrudes from the inner surface of the through hole.
According to this configuration, the shaft member can be reliably held.

The press-fitting portion may have a displacement regulating structure that regulates displacement in the thickness direction with respect to the component main body.
According to this configuration, since the displacement of the shaft member can be restricted, the mechanical component can be prevented from being damaged, and the timekeeping accuracy of the timepiece using the mechanical component can be improved.

  The component body is preferably made of a brittle material.

The movement of the present invention includes the mechanical component.
According to this configuration, it is possible to provide a movement with high timing accuracy.

The timepiece of the present invention includes the mechanical part.
According to this configuration, it is possible to provide a timepiece having a high timing accuracy.

  The present invention is a method of manufacturing a mechanical component that rotates about a shaft member, wherein the mechanical component is formed on a component main body having a through hole through which the shaft member is inserted, and an inner surface of the through hole, A press-fit portion fixed to the shaft member by press-fitting the shaft member, and holding at least a part of the press-fit portion on the inner surface of the through-hole. A holding recess that is an anchor structure that regulates displacement is formed, and an inner shape corresponding to the shape of the press-fit portion and an outer shape corresponding to the outer shape of the component main body are formed on at least one surface of the base material that is the component main body. Forming a holding mask, forming the holding recess in the base material in accordance with the inner shape of the mask, and forming the holding recess from the metal material by electroforming so that at least a part is held in the holding recess Shape the press-fit part A step of, providing a method of manufacturing a mechanical part and a step of removing the unnecessary portion of the substrate in accordance with the outer shape of the mask.

According to the present invention, the common mask is used to form the press-fit portion and define the outer shape of the component main body, so that the coaxiality of the component main body with respect to the shaft member can be increased. Moreover, the dimensional accuracy in the radial direction can be increased.
For this reason, it is difficult to cause the shaft displacement with respect to the shaft member, and it is possible to prevent the eccentricity during the operation of the mechanical component. Therefore, the timekeeping accuracy of the timepiece using this mechanical component can be increased.

According to the mechanical component of the present invention, since the holding recess that is an anchor structure that restricts the displacement of the press-fit portion is formed in the component main body, the fixing strength of the press-fit portion with respect to the component main body is increased, and the mechanical component is in operation. It is possible to make it difficult for rotational loosening to occur. Therefore, the torque of the shaft member can be reliably transmitted to the component main body, and the timekeeping accuracy of the timepiece using this mechanical component can be improved.
In addition, since at least a part of the press-fit portion is held in the holding recess, the radial dimension (thickness) of the press-fit portion can be increased in this portion. For this reason, sufficient press-fitting allowance can be ensured and the buffering effect can be enhanced. Therefore, even when a brittle material is used for the component main body, it is possible to prevent the mechanical component from being damaged by the stress when the shaft member is press-fitted.
Moreover, since the radial dimension (thickness) of the press-fit portion can be increased, the press-fit portion can be hardly peeled off.
Furthermore, since the press-fit portion is made of a metal material, it can be formed by electroforming. As a result, the press-fit portion can be formed without attaching the metal material to the outer peripheral surface of the component main body, so that the outer diameter of the mechanical component does not increase. Therefore, the dimensional accuracy of the machine parts can be increased and the timekeeping accuracy of the timepiece can be improved.

According to the method for manufacturing a mechanical component according to the present invention, the press-fit portion is formed using a common mask and the outer shape of the component main body is defined. Therefore, the coaxiality of the component main body with respect to the shaft member can be increased. Moreover, the dimensional accuracy in the radial direction can be increased.
For this reason, it is difficult to cause the shaft displacement with respect to the shaft member, and it is possible to prevent the eccentricity during the operation of the mechanical component. Therefore, the timekeeping accuracy of the timepiece using this mechanical component can be increased.

It is a figure which shows the machine component in 1st Embodiment of this invention, (a) is a whole top view, (b) is the top view which expanded a part of (a). It is sectional drawing which shows the machine component of FIG. 1, and is sectional drawing which follows the I-I 'line of Fig.1 (a). It is explanatory drawing which shows the manufacturing method of the machine component in embodiment of this invention. It is explanatory drawing which shows the manufacturing method of the mechanical components following a previous figure. It is explanatory drawing which shows the manufacturing method of the mechanical components following a previous figure. It is explanatory drawing which shows the manufacturing method of the mechanical components following a previous figure. It is a schematic diagram which shows the structure of an electroforming apparatus. It is a top view which shows the specific example of the machine component of 1st Embodiment of this invention. It is a top view which shows the machine component in 2nd Embodiment of this invention. It is a top view which shows the machine component in 3rd Embodiment of this invention. It is a top view which shows the machine component in 4th Embodiment of this invention. It is a top view which shows the modification of the machine component of 1st Embodiment of this invention. It is sectional drawing which shows typically the 1st modification of the machine component of FIG. It is sectional drawing which shows typically the 2nd modification of the machine component of FIG. It is sectional drawing which shows typically the 3rd modification of the machine component of FIG. It is sectional drawing which shows typically the 4th modification of the machine component of FIG. It is sectional drawing which shows typically the 5th modification of the machine component of FIG. It is a top view of the complete in embodiment of this invention. It is a top view of the movement front side in the embodiment of the present invention.

(First embodiment, machine parts)
The mechanical component 10 which is 1st Embodiment of this invention is demonstrated.
FIG. 1A is a plan view showing the mechanical component 10, and FIG. 1B is an enlarged plan view of a part of the mechanical component 10. FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. FIG. 1 shows the mechanical component 10 before the shaft member 30 is press-fitted.

As shown in FIGS. 1 and 2, the mechanical component 10 includes a substantially disc-shaped component main body 11 and a press-fit portion 12 provided inside the component main body 11.
A1 is a central axis of the component main body 11 and a rotation axis of the mechanical component 10.
In the following description, the “circumferential direction” is a circumferential direction of a circle whose center coincides with the central axis A1 in the plane including the first surface 11a of the component main body 11. The “radial direction” is the radial direction of the circle. The “axial direction” is a direction along the central axis A1. Further, “inward” is a direction approaching the central axis A1, and “outward” is a direction away from the central axis A1. Further, among the circumferential directions, the clockwise direction in FIG. 1A is referred to as a C1 direction, and the counterclockwise direction is referred to as a C2 direction.

As shown in FIG. 1, a central hole portion 14 (through hole) that penetrates the component main body 11 in the thickness direction is formed at the center of the component main body 11.
A plurality of holding recesses 15 are formed at intervals in the circumferential direction on the inner edge 14 a (inner surface) of the central hole portion 14.
The holding recess 15 is formed in a substantially sector shape having an arcuate outer edge 15a along the circumferential direction and side edges 15b and 15b that are inward from both ends of the outer edge 15a in plan view. On the side edges 15b and 15b, convex portions 16 and 16 are formed at positions away from the outer edge 15a (positions closer to the inner side than the outer edge 15a), respectively.

In the example shown in FIG. 1, four holding recesses 15 are formed. These holding recesses 15 may be referred to as first to fourth holding recesses 15A to 15D in the clockwise direction.
A portion between adjacent holding recesses 15 and 15 is referred to as an intermediate portion 17. These intermediate portions 17 may be referred to as first to fourth intermediate portions 17A to 17D in the clockwise direction.

The holding recesses 15 are preferably formed at regular intervals in the circumferential direction. That is, it is preferable that the dimensions of the intermediate portion 17 in the circumferential direction are equal to each other. The circumferential dimensions of the holding recess 15 are preferably equal to each other. In the example of FIG. 1, the four holding recesses 15 are formed by shifting their positions by 90 degrees in the circumferential direction.
The number of holding recesses is not limited to the illustrated example. The number of holding recesses may be one or more.

The positional relationship of each component of the mechanical component 10 may be described with reference to an XY coordinate system.
In the plane parallel to the first surface 11a of the component main body 11, the center (circumferential center) of the intermediate portion 17 (first intermediate portion 17A) that is a portion between the first holding recess 15A and the second holding recess 15B. ) And the direction along the radial direction is referred to as the X direction. A direction perpendicular to the X direction in a plane parallel to the first surface 11a of the component main body 11 is referred to as a Y direction.

C1 direction side edge 15b (side edge 15Ab2) of the first holding recess 15A, C2 direction side edge 15b (side edge 15Bb1) of the second holding recess 15B, and C1 direction side of the third holding recess 15C. The side edge 15b (side edge 15Cb2) and the side edge 15b (side edge 15Db1) on the C2 direction side of the fourth holding recess 15D can be formed along the X direction.
The side edge 15b (side edge 15Ab1) on the C2 direction side of the first holding recess 15A, the side edge 15b (side edge 15Bb2) on the C1 direction side of the second holding recess 15B, and the C2 direction side of the third holding recess 15C The side edge 15b (side edge 15Cb1) and the side edge 15b (side edge 15Db2) on the C1 direction side of the fourth holding recess 15D can be formed along the Y direction.

As shown in FIG. 1B, the convex portion 16 can be, for example, a rectangular shape in plan view, and can be formed so as to protrude in a direction perpendicular to the side edge 15b.
The outer edge 16a of the convex portion 16 is formed in a direction inclined with respect to the side edge 15b (perpendicular to the side edge 15b in FIG. 1B). The outer edge 16 a is a portion where the circumferential position changes greatly, and is also referred to as a receiving step portion 19.
In the receiving step part 19, the dimension of the holding | maintenance recessed part 15 in the circumferential direction is changing discontinuously. That is, the circumferential dimension of the holding recess 15 increases discontinuously in the receiving step portion 19 toward the outside.
With this structure, the inward displacement of the shaft support portion 18 can be prevented, the fixing strength of the press-fit portion 12 with respect to the component main body 11 can be further increased, and the loosening of rotation during the operation of the mechanical component 10 can be prevented.
The tip edge 16b of the convex portion 16 can be formed in parallel with the side edge 15b.
In addition, the planar view shape of a convex part is not restricted to a rectangle, It is good also as a semicircle and a triangle. A plurality of convex portions may be formed. The plurality of convex portions can be formed in a plurality of stages.

As shown in FIG. 1A, of the inner edge 17a of the intermediate portion 17 (the inner edge 14a of the central hole portion 14), the inner edges 17Aa and 17Ca of the first intermediate portion 17A and the third intermediate portion 17C are along the Y direction. Can be formed.
Inner edges 17Ba and 17Da of the second intermediate portion 17B and the fourth intermediate portion 17D can be formed along the X direction.

The holding recess 15 has a width dimension L1 (see FIG. 1A) at the innermost circumferential position 15c (the innermost position of the tip edge 16b of the convex portion 16) (first position) (see FIG. 1B). Is smaller than the width L2 (see FIG. 1A) at the outermost peripheral position 15d (the outermost position of the side edge 15b) (second position) (see FIG. 1B).
The width dimension L1 is the distance between the innermost circumferential position 15c at one end in the circumferential direction of the holding recess 15 and the innermost circumferential position 15c at the other end. The width dimension L2 is the distance between the outermost peripheral position 15d at one end in the circumferential direction of the holding recess 15 and the outermost peripheral position 15d at the other end.

The holding recess 15 functions as an anchor structure that restricts the shaft support 18 from being displaced inward and circumferentially by holding the shaft support 18.
With this structure, the inward and circumferential displacements of the shaft support portion 18 can be prevented, so that the fixing strength of the press-fit portion 12 with respect to the component main body 11 can be further increased, and rotational loosening during the operation of the mechanical component 10 can be prevented. it can.
The holding recess has a first position that does not have to be the innermost circumferential position as long as the width dimension at the first position is smaller than the width dimension at the second position on the outer peripheral side from the first position, and the second position. May not be the outermost peripheral position.

As the material of the component body 11, a brittle material such as a ceramic material is preferable. As the ceramic material, Si, SiC, Si ₃ N ₄ , zirconia, ruby, carbon material and the like can be used.
The brittle material has a small limit strain amount of elastic deformation due to external stress. If the elastic deformation limit is exceeded, the yield point does not exist and the material breaks. Preferably, the elastic deformation region is 1%. The following is preferable, and more preferably 0.5% or less. Brittle materials have the property of low toughness.
The component main body 11 desirably has high insulation properties. If the insulation of the component body 11 is not sufficient, it is desirable to form an oxide film on the surface that contacts the shaft support 18.

A shaft support portion 18 that constitutes the press-fit portion 12 is formed in the holding recess 15 (15A to 15D).
The shaft support portion 18 fills the internal space of the holding recess 15, and a part of the shaft support portion 18 protrudes inward from the inner edge 17 a of the intermediate portion 17 (inner edge 14 a of the central hole portion 14). With this structure, the shaft support portion 18 can reliably hold the shaft member 30.
The shaft support portion 18 has a generally sector shape having an arcuate outer edge 18a that contacts the outer edge 15a, a side edge 18b that contacts the side edge 15b, and an inner edge 18c along the circumferential direction in plan view.
A portion of the shaft support portion 18 formed in the holding recess 15 is referred to as a main portion 21, and a portion protruding inward from the inner edge 17 a of the intermediate portion 17 is referred to as a protrusion portion 22.

On the side edges 18b and 18b, recesses 24 and 24 are formed at positions away from the outer edge 18a (positions closer to the inner side than the outer edge 18a), respectively.
The concave portion 24 has an inner edge 24 a that contacts the outer edge 16 a (receiving step portion 19) of the convex portion 16, and a linear side edge 24 b that contacts the leading edge 16 b of the convex portion 16.
The inner edge 24 a is a portion where the circumferential position changes greatly, and is also referred to as a contact step portion 25. In the contact step portion 25, the circumferential dimension of the shaft support portion 18 changes discontinuously. That is, the circumferential dimension of the shaft support portion 18 increases discontinuously at the contact step portion 25 toward the outside.
The inner edge 24a (abutting step portion 25) abuts against the outer edge 16a (the receiving step portion 19) of the convex portion 16, thereby reliably preventing the shaft support portion 18 from being displaced inward.
In the example shown in FIG. 1, the side edge 24b is formed in a straight line parallel to the side edge 15b.

The shaft support portion 18 has a portion on the outer peripheral side (outer peripheral portion 28) and a portion on the inner peripheral side (inner peripheral portion 29) on the basis of the contact step portion 25.
The outer peripheral portion 28 has a substantially sector shape in which the circumferential dimension increases toward the outer peripheral side. The inner peripheral portion 29 also has a substantially sector shape in which the circumferential dimension increases toward the outer peripheral side.
Since the circumferential dimension of the shaft support 18 changes discontinuously at the contact step 25, the maximum circumferential dimension of the inner circumferential portion 29 is smaller than the minimum circumferential dimension of the outer circumferential portion 28.

As shown in FIG. 2, the first surface 18 d of the shaft support portion 18 can be formed flush with the first surface 11 a of the component body 11, and the second surface 18 e of the shaft support portion 18 is formed on the component body 11. It can be formed flush with the second surface 11b.
The shaft support 18 is advantageous in increasing the holding force of the shaft member 30 when the radial dimension is large.
The shaft support 18 is integrated with the component main body 11.

The outer diameter of the component main body 11 can be set to several mm to several tens mm, for example. The thickness of the component main body 11 can be about 100-1000 micrometers, for example.
Diameter _{r a} of FIG. 1 and FIG. 2 is the distance from the center axis A1 to the inner edge 18c of the shaft support portion 18. Diameter _{r b} is the distance from the center axis A1 to an outer edge 18a of the shaft support portion 18.
Diameter _{r c} is the distance from the center axis A1 to the inner edge 24a of the recess 24 (those Seddan portion 25) (see Figure 1 (b)). Specifically, the diameter _{r c} is the distance from the center axis A1 to the tip of the inner edge 24a 24a1.
The diameter R is the minimum distance from the central axis A1 to the inner edge 17a of the intermediate portion 17, and is the distance from the central axis A1 at the center of the inner edge 17a of the intermediate portion 17 in FIG.

Diameter r _a of the shaft support portion 18 is smaller than the diameter R of the intermediate portion 17. That is, “R> r _a ”.
The difference between the diameter r _a of the radius R and the shaft supporting portion 18 of intermediate section 17 (R-r _a) is dimensioned to be a press-fit allowance when the shaft member 30 is press-fitted to the inner space 26 (described later), About 10 μm is preferable.
Diameter _{r c} is larger than the diameter _{r a,} and is smaller than the diameter _{r b.} That is, “r _a <r _c <r _b ”.
Radial dimension t of the shaft support portion 18 is the difference between the diameter _{r b} and the diameter _{r a (r b -r a)} , several tens of μm or more.
The aspect ratio (radial dimension t / axial dimension) of the shaft support 18 is preferably 10 or less.
By setting the aspect ratio within this range, a sufficient press-fitting allowance can be secured, and damage to the component main body 11 can be easily prevented.

The press-fit portion 12 is configured by four shaft support portions 18 arranged in the circumferential direction. It can be said that the shape of the shaft support portion 18 is a shape in which the annular body is divided at four locations whose circumferential positions are different from each other.
By making the press-fitting part 12 into a divided shape, displacement of the press-fitting part 12 in the circumferential direction is less likely to occur, the fixing strength of the press-fitting part 12 with respect to the component main body 11 is further increased, and rotation loosening during the operation of the mechanical component 10 is prevented. be able to. Therefore, the torque of the shaft member 30 can be reliably transmitted to the component main body 11.
In addition, the division | segmentation number of a shaft support part should just be 1 or more, 2 or more are preferable and 3 or more are more preferable. When the number of divisions is 1, the shaft support portion is approximately C-shaped, and when the number of divisions is 2, the shaft support portion is in the shape of two arcs facing each other.

The shaft support portion 18 is made of a metal material. The metal material is preferably a material that can be plastically flowed and can be formed by electroforming.
Examples of such a metal material include Au, Ni, Cu, and alloys thereof. Examples of the alloy include Ni alloys (Ni—Fe, Ni—W, etc.), Cu alloys, Au alloys, and the like.
Since the metal material has higher bending strength, tensile strength, ductility, and limit strain and is less brittle than the brittle material, the mechanical component 10 can be less likely to be damaged when the shaft member 30 is press-fitted.

A shaft member 30 can be press-fitted into a space 26 (inner space 26) inside the inner edge 18 c of the shaft support portion 18.
When the shaft member 30 is press-fitted, the shaft support portion 18 is pressed outward and plastically deformed in the compression direction, and the inner edge 18c of the shaft support portion 18 holds the shaft member 30, whereby the mechanical component 10 is It is fixed to the shaft member 30.

The diameter of the shaft member 30 can be, for example, about several tens to 500 μm.
The shaft support 18 may be joined to the shaft member 30 after being attached to the shaft member 30. As a bonding method, laser welding, soldering, diffusion bonding, brazing, eutectic bonding, thermocompression bonding, bonding with an adhesive, bonding with wax, or the like can be employed.

According to the mechanical component 10, the holding recess 15, which is an anchor structure that restricts the displacement of the press-fit portion 12, is formed in the component main body 11, so that the fixing strength of the press-fit portion 12 with respect to the component main body 11 can be increased. For this reason, it is possible to make it difficult for rotational loosening to occur during the operation of the mechanical component 10. Therefore, the torque of the shaft member 30 can be reliably transmitted to the component main body 11, and the timekeeping accuracy of the timepiece using the mechanical component 10 can be improved.
Moreover, since a part of press-fit part 12 is hold | maintained at the holding | maintenance recessed part 15, the radial direction dimension (thickness) of the press-fit part 12 can be enlarged in this part. For this reason, sufficient press-fitting allowance can be ensured and the buffering effect can be enhanced. Therefore, even when a brittle material is used for the component main body 11, it is possible to prevent the mechanical component 10 from being damaged due to stress when the shaft member 30 is press-fitted.
Moreover, since the radial dimension (thickness) of the press-fit portion 12 can be increased, the press-fit portion 12 can be hardly peeled off.
Furthermore, since the press-fit portion 12 is made of a metal material, it can be formed by electroforming. Thereby, since the press-fit portion 12 can be formed without attaching a metal material to the outer peripheral surface of the component main body 11, the outer diameter of the mechanical component 10 does not increase. Therefore, the dimensional accuracy of the machine part 10 can be increased and the timekeeping accuracy of the timepiece can be improved.

(First Embodiment, Manufacturing Method of Machine Parts)
Next, the manufacturing method of the mechanical component 10 of 1st Embodiment is demonstrated, referring FIGS. 3-6.
In FIG. 3, (a), (c), and (e) are plan views, and (b), (d), and (f) are II-II ′ in (a), (c), and (e), respectively. It is sectional drawing of a line, III-III 'line, and IV-IV' line. In FIG. 4, (a), (c), and (e) are plan views, and (b), (d), and (f) are VV ′ in (a), (c), and (e), respectively. It is sectional drawing of a line, VI-VI 'line, and VII-VII' line. 5, (a) and (c) are plan views, and (b) and (d) are cross-sectional views taken along lines VIII-VIII ′ and IX-IX ′, respectively. 6, (a) and (c) are plan views, and (b) and (d) are cross-sectional views taken along lines XX ′ and XI-XI ′, respectively.

  The manufacturing method of the present embodiment includes a step of manufacturing the molding die 41, a step of forming the press-fit portion 12 in the molding die 41 by electroforming, and a step of removing unnecessary portions.

(1) Fabrication of mold A base 31 made of Si or the like is prepared as shown in FIGS. 3 (a) and 3 (b).
Next, as shown in FIGS. 3C and 3D, a first mask 32 made of an oxide such as SiO ₂ is provided on at least one surface (here, the first surface 31 a) of the base material 31. Form.
The first mask 32 has an annular main body portion 32a, a central portion 32b that is formed inside the main body portion 32a so as to be separated from the main body portion 32a, and a plurality of connecting portions 32c that connect them together.
A plan view shape (inner shape of the first mask 32) of the gap portion 32d between the main body portion 32a and the central portion 32b is a shape corresponding to the shape of the press-fit portion 12 shown in FIG. Specifically, it has the same planar view shape as that of the press-fit portion 12.
The external shape of the first mask 32 in plan view is the same as the external shape of the component body 11 in plan view.

The first mask 32 can be formed, for example, by patterning a coating film made of an oxide (for example, SiO ₂ ) or the like formed over the entire first surface 31a of the substrate 31 by photolithography.
The coating film can be patterned by the following method, for example.
The coating film is formed over the entire first surface 31a of the substrate 31, and a resist layer (not shown) is formed on the surface of the coating film. As the resist layer, a negative type photoresist or a positive type photoresist may be used.
A predetermined photomask is disposed on the surface of the resist layer, and the resist layer is exposed. The shape and size of the light shielding pattern of the photomask in plan view correspond to the shape and size of the component main body 11 in plan view shown in FIG.
Unnecessary portions are removed by development of the resist layer, and the resist layer has a shape corresponding to the first mask 32.
The first mask 32 shown in FIGS. 3 (c) and 3 (d) is formed by removing the coating film where there is no resist layer by dry etching or the like. After the formation of the first mask 32, the resist layer is removed.

Next, as shown in FIGS. 3E and 3F, an annular second mask 33 is formed in a region outside the outer edge of the first mask 32.
The second mask 33 covers a region outside the first mask 32 on the first surface 31 a of the substrate 31. Since the gap portion 32d is not covered by the second mask 33, the first surface 31a of the substrate 31 is exposed at the gap portion 32d.
As shown in FIGS. 3E and 3F, the second mask 33 may partially cover an area including the outer edge of the first mask 32.

The second mask 33 can be formed by a resist layer, for example. As the resist layer, a negative type photoresist or a positive type photoresist may be used.
The resist layer can be formed by patterning by photolithography, for example. For example, the annular second mask 33 shown in FIGS. 3E and 3F can be formed by exposing and developing the resist layer through a predetermined photomask.

Next, as shown in FIGS. 4A and 4B, the portion of the base material 31 exposed in the gap portion 32d of the first mask 32 is removed by dry etching or the like. As a result, a through hole 34 having a shape and a size in plan view corresponding to the gap portion 32d is formed in the base material 31.
The through hole 34 becomes the holding recess 15 in a later step.
At this time, since the region outside the first mask 32 is covered with the second mask 33, this region is not removed.
By removing the second mask 33, the molding die 41 in which the first mask 32 is formed on the surface of the base material 31 having the through holes 34 is obtained.

  The etching used in the manufacturing method of this embodiment may be dry etching such as reactive ion etching (RIE) or wet etching using a buffered hydrofluoric acid aqueous solution (BHF). As RIE, deep reactive ion etching (DRIE) is preferable.

(2) Formation of press-fit portion As shown in FIGS. 4C and 4D, the molding die 41 is fixed to the surface 60a of the substrate 60 by adhesion or the like. At this time, the molding die 41 is in a posture in which the first surface 31 a of the base material 31 faces the substrate 60. The board | substrate 60 and the shaping | molding die 41 fixed to this are called shaping | molding die 41A with a board | substrate. The substrate 60 may have a conductive film (not shown) made of metal or the like on the surface 60a, or the substrate 60 itself may be made of a conductive material.
In FIG. 4C and FIG. 4D, the molding die 41 is in a posture with the first surface 31a facing downward.

The shaft support 18 is formed of a metal material in the gap portion 32d of the mold 41. The shaft support 18 is preferably formed by electroforming.
FIG. 7 is a schematic diagram showing a configuration of an electroforming apparatus 50 for forming the shaft support portion 18.
The electroforming apparatus 50 includes an electroforming tank 51, an electrode 53, an electric wiring 55, and a power supply unit 57.
An electroforming solution 59 is stored in the electroforming tank 51. The electrode 53 is immersed in the electroforming liquid 59. The electrode 53 is formed using the same metal material as that of the shaft support portion 18.
The electrical wiring 55 has a first wiring 55a and a second wiring 55b. The first wiring 55 a connects the electrode 53 and the anode side of the power supply unit 57. The second wiring 55 b connects the forming die 41 </ b> A with the substrate and the cathode side of the power supply unit 57.
With this configuration, the electrode 53 is connected to the anode side of the power source 57, and the molding die 41A with the substrate is connected to the cathode side.

  The electroforming liquid 59 is selected according to the electroforming material. For example, when an electroformed member made of nickel is formed, a sulfamic acid bath, a watt bath, a sulfuric acid bath, or the like is used. When nickel electroforming is performed using a sulfamic acid bath, for example, sulfamic acid containing nickel sulfamate hydrate as a main component is placed in the electroforming tank 51 as the electroforming liquid 59.

As shown in FIG. 7, the molding die 41A with the substrate is set in the electroforming apparatus 50, the power source 57 is operated, and a voltage is applied between the electrode 53 and the molding die 41A with the substrate.
Thereby, the metal (for example, nickel) which comprises the electrode 53 ionizes, moves the electroforming liquid 59, and deposits in the area | region which faced the through-hole 34 of the shaping | molding die 41 among the surfaces 60a of the board | substrate 60.
As shown in FIGS. 4C and 4D, the metal grows in the through hole 34, and the shaft support portion 18 is formed. When the through hole 34 is filled with metal and the metal grows to a degree that protrudes slightly from the second surface 31b, voltage application is stopped.

Next, as shown by phantom lines in FIG. 4D, the metal (bulged portion 61) of the portion protruding from the second surface 31b is removed by grinding, polishing, or the like. The metal surface is preferably flush with the second surface 31b.
Specifically, after the molding die 41 having the metal formed in the through hole 34 is taken out from the electroforming tank 51, the second surface 31b of the molding die 41 is ground and polished to flatten the second surface 31b. In addition, the thickness of the mold 41 can be adjusted.
As a result, the shaft support portion 18 is formed in the through hole 34.
Next, the mold 41 is removed from the substrate 60.

(3) Removal of Unnecessary Part Next, as shown in FIGS. 4E and 4F, a third mask 35 having a central hole 63 is formed on the first surface 31 a of the base material 31. The shape and size of the central hole portion 63 in plan view correspond to the shape and size of the central hole portion 14 shown in FIG. 1A in plan view.
The material constituting the third mask 35 is preferably selected so as not to damage the shaft support 18 made of metal when the central portion 32b of the first mask 32 is removed in the next step. The third mask 35 may be a resist layer or a metal layer.
In FIG. 4 (e) and FIG. 4 (f), the mold 41 is in a posture with the first surface 31a facing upward.

Next, as shown in FIGS. 5A and 5B, the central portion 32b of the first mask 32 is removed. In order to remove the central portion 32b, for example, dry etching using a fluorocarbon-based gas can be employed.
Next, as shown in FIGS. 5C and 5D, the third mask 35 is removed using an organic solvent, O ₂ plasma ashing, or the like.

Next, as shown in FIG. 6A and FIG. 6B, the base material 31 in a region where the first mask 32 is not formed, that is, a region located inside and outside the first mask 32 in a plan view. Remove.
By removing the base material 31 in the region located inside the first mask 32, the central hole portion 14 shown in FIG. 1A is formed in the base material 31.
By removing the base material 31 in the region located outside the first mask 32, the component main body 11 having the shape shown in FIG. 1A is obtained.

Next, as shown in FIGS. 6C and 6D, the first mask 32 is removed. In order to remove the first mask 32, for example, dry etching using a fluorocarbon-based gas can be employed.
As a result, the mechanical component 10 shown in FIGS. 1 and 2 is obtained.

According to the manufacturing method of the machine part of the present embodiment, the common first mask 32 is used to form the press-fit portion 12 and to define the outer shape of the part body 11, so that the part body 11 is coaxial with the shaft member 30. The degree can be increased. Moreover, the dimensional accuracy in the radial direction can be increased.
For this reason, it is possible to prevent the shaft member 30 from being misaligned and prevent the mechanical component 10 from being decentered. Therefore, the timekeeping accuracy of the timepiece using this mechanical component 10 can be increased.

(Specific examples of the first embodiment, machine parts)
FIG. 8 is a plan view of a machine part 10A according to a specific example of the machine part 10 of the first embodiment.
The machine part 10A is a gear, and a plurality of teeth 27 projecting radially outward are formed on the outer peripheral edge of the machine part 10A. The teeth 27 have a shape (tapered shape) that gradually decreases in width in the protruding direction. By forming the teeth 27, the mechanical component 10A can mesh with the adjacent gear.
The gear as the machine part 10A is a wheel or the like.
The machine part 10 is not limited to a gear like the machine part 10A, but may be a escape wheel, ankle, a worm or the like.

(Second embodiment, machine parts)
The mechanical component 70 which is 2nd Embodiment of this invention is demonstrated. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.
FIG. 9 is a plan view showing the mechanical component 70.
As shown in FIG. 9, the mechanical component 70 includes a substantially disc-shaped component main body 71 and a press-fit portion 72 provided inside the component main body 71.
A central hole 74 (through hole) is formed in the center of the component main body 71, and three holding recesses 75 are formed on the inner edge 74 a (inner surface) of the central hole 74 at intervals in the circumferential direction. .
The holding recess 75 is formed in a substantially sector shape having an arcuate outer edge 75a along the circumferential direction and linear side edges 75b and 75b that are inward from both ends of the outer edge 75a in plan view.

The holding recess 75 is formed such that the width dimension L3 at the innermost peripheral position 75c (first position) is smaller than the width dimension L4 at the outermost peripheral position 75d (second position).
The holding recess 75 functions as an anchor structure that restricts the displacement of the shaft support portion 78 inwardly and circumferentially by holding the shaft support portion 78.
A portion between adjacent holding recesses 75 and 75 is referred to as an intermediate portion 77.
The component main body 71 is preferably made of a brittle material such as a ceramic material, similarly to the component main body 11 in the first embodiment.

The holding recess 75 is formed with a shaft support portion 78 that constitutes a press-fit portion 72.
The shaft support portion 78 fills the internal space of the holding recess 75 and is formed to protrude inward from the inner edge of the intermediate portion 77.
The shaft support portion 78 has a generally sector shape having an arcuate outer edge 78a that contacts the outer edge 75a, a side edge 78b that contacts the side edge 75b, and an inner edge 78c along the circumferential direction in plan view.
The shaft support portion 78 is formed of a metal material using an electroforming method, similarly to the shaft support portion 18 in the first embodiment.
The press-fit portion 72 is configured by three shaft support portions 78 arranged in the circumferential direction, and this shape can be said to be a shape in which the annular body is divided at three locations.

  The shaft member 30 that rotates the mechanical component 70 can be press-fitted into the space 26 (inner space 26) inside the inner edge 78c.

In the mechanical component 70, unlike the mechanical component 10 of the first embodiment, the side edges 75b and 75b have no stepped portion, but the holding recess 75 has a sufficient function as an anchor structure that restricts the displacement of the press-fit portion 72. Therefore, the fixing strength of the press-fit portion 72 with respect to the component main body 71 can be increased. For this reason, the rotation looseness of the mechanical component 70 is made difficult to occur, and the timekeeping accuracy of the timepiece can be improved.
Moreover, since the radial dimension (thickness) of the press-fit portion 72 can be increased without increasing the outer diameter, similarly to the mechanical component 10 of the first embodiment, the buffering effect is enhanced to prevent the mechanical component 70 from being damaged, The dimensional accuracy of the mechanical component 70 can be increased and the timekeeping accuracy of the timepiece can be improved.

(Third embodiment, machine parts)
The mechanical component 80 which is 3rd Embodiment of this invention is demonstrated.
FIG. 10 is a plan view showing the mechanical component 80.
As shown in FIG. 10, the mechanical component 80 is formed in that a receiving concave portion 82 is formed in the component main body 81 for receiving a bulging deformation portion of the shaft support portion 18 generated by the press-fitting of the shaft member 30. Different from the component main body 11 shown in 1 etc.

The receiving recess 82 is formed from the vicinity of the end of the outer edge 15a of the holding recess 15 to the vicinity of the end on the outer peripheral side of the side edge 15b.
In the example shown in FIG. 10, the receiving recess 82 has an arcuate plan view shape centered on a corner 18 f that is an intersection of the outer edge 18 a and the side edge 18 b of the shaft support 18.

  The receiving recess 82 can receive a bulging deformed portion of the shaft support portion 18 that is generated when a force is applied to the shaft support portion 18 by press-fitting the shaft member 30. For this reason, the stress accompanying press-fitting of the shaft member 30 can be relaxed. Therefore, it is difficult for excessive force to be applied to the component main body 11, and damage to the component main body 11 can be reliably prevented.

The position where the receiving recess is formed is not limited to the position shown in FIG. 10, and may be any position in the extending direction of the outer edge 15a or the side edge 15b. For example, you may form in the center position of the circumferential direction of the outer edge 15a.
The shape of the receiving recess in plan view is not limited to the arc shape, and may be any shape, for example, a rectangle, a semicircle, a triangle, and the like.

(Fourth embodiment, machine parts)
The mechanical component 90 which is 4th Embodiment of this invention is demonstrated.
FIG. 11 is a plan view showing the mechanical component 90.
As shown in FIG. 11, the mechanical component 90 includes a substantially disc-shaped component main body 91 and a press-fit portion 92 provided inside the component main body 91.
A central hole portion 94 (through hole) having a substantially circular shape in plan view is formed at the center of the component main body 91, and three holding recesses 95 are provided at the inner edge (inner surface) of the central hole portion 94 at intervals in the circumferential direction. Is formed.
The holding recess 95 can have an arc shape in plan view. Since the center of the arc-shaped holding recess 95 in the illustrated example is outside the circle formed by the central hole portion 94, the width dimension L5 at the innermost circumferential position 95c (first position) is the position 95d at which the width dimension is maximum. It is smaller than the width dimension L6 at (second position).
The holding recess 95 functions as an anchor structure that restricts the press-fit portion 92 from being displaced in the circumferential direction by holding the protruding portion 98. Since the holding recess 95 has a width dimension L5 smaller than the width dimension L6, the holding recess 95 has a structure that can also restrict the inward displacement of the press-fit portion 92.

The press-fit portion 92 has an annular main body portion 93 formed on the inner surface of the central hole portion 94 and a protruding portion 98 that protrudes outward from the outer edge of the main body portion 93.
The protruding portion 98 is formed so as to fill the internal space of the holding recess 95 and has the same planar view shape as the holding recess 95 (arc shape in FIG. 11).
The press-fitting part 92 is formed of a metal material by using an electroforming method, similarly to the press-fitting part 12 in the first embodiment.
In addition, the planar view shape of the protrusion part 98 is not restricted to a circular arc shape, It is good also as a rectangle, a semicircle, a triangle, etc.

  According to the mechanical component 90, since the holding recess 95 having an anchor structure that restricts the displacement of the press-fit portion 92 is formed in the component main body 91, the fixing strength of the press-fit portion 92 with respect to the component main body 91 can be increased. it can. For this reason, the rotation looseness of the mechanical component 90 is hardly caused, and the timekeeping accuracy of the timepiece can be improved.

(Modification of first embodiment, machine part)
As shown in FIG. 12, in the mechanical component 10 of the first embodiment, the first unevenness 16c is formed on the tip edge 16b of the convex portion 16, and the first edge is formed on the side edge 24b of the concave portion 24 in contact with the first unevenness 16c. The second unevenness 24c having a shape corresponding to the uneven structure 16c may be formed.
By fitting the first unevenness 16c and the second unevenness 24c to each other, the anchor effect (in this example, the effect of making the inward displacement of the shaft support portion 18 less likely) is enhanced.

(First modification of first embodiment, machine part)
FIG. 13 is a cross-sectional view schematically showing a machine component 220 that is a first modification of the machine component 10 of the first embodiment. FIG. 13 is a cross-sectional view taken along a line (see line II ′ in FIG. 1A) passing through the central axis, the holding recess, and the shaft support portion of the mechanical component 220, as in FIG.
The inner surface 225b of the peripheral edge 225a of the holding recess 225 is an inclined surface that is inclined at a constant angle so that the diameter decreases from the first surface 221a to the second surface 221b.
The shaft support portion 228 has a structure that regulates displacement in the thickness direction (relative to the component main body 221). Specifically, the outer surface 228b of the outer edge 228a of the shaft support portion 228 is an inclined surface that is inclined at a constant angle so that the diameter decreases from the first surface 228c to the second surface 228d, and is in contact with the inner surface 225b over the entire surface.
Since the outer diameter (maximum outer diameter) of the first surface 228c of the shaft support portion 228 is larger than the inner diameter (minimum inner diameter) of the second surface 221b of the holding recess 225, the shaft support portion 228 moves downward (the thickness of the component main body 221). (Movement in the vertical direction) is restricted.
With this structure, the mechanical component 220 can prevent the shaft support portion 228 from falling off and enhance its durability.

(Second modification of first embodiment, machine part)
FIG. 14 is a cross-sectional view schematically showing a machine component 230 that is a second modification of the machine component 10 of the first embodiment.
The shaft support portion 238 has a structure that regulates displacement in the thickness direction (relative to the component main body 231). Specifically, the shaft support portion 238 has an L-shaped structure including a main body portion 238a and an outwardly extending portion 238b.
The main body 238 a is provided on the inner surface 235 b of the peripheral edge 235 a of the holding recess 235. The outward extending portion 238b extends radially outward along the first surface 231a of the component main body 231 from the end of the main body 238a on the first surface 231a side.
The shaft support portion 238 is restricted from moving downward (moving in the thickness direction of the component main body 231) by the first surface 231a contacting the outward extending portion 238b.
With this structure, the mechanical component 230 can prevent the shaft support portion 238 from falling off and enhance its durability.

(Third Modification of First Embodiment, Machine Part)
FIG. 15 is a cross-sectional view schematically showing a machine component 240 that is a third modification of the machine component 10 of the first embodiment.
The holding recess 245 has a main portion 245c and a first surface recess 245d. The main portion 245c is formed on the inner surface 245b of the peripheral edge 245a of the holding recess 245. The first surface recess 245 d is formed on the first surface 241 a of the component main body 241.
The shaft support portion 248 has a structure that regulates displacement in the thickness direction (relative to the component main body 241). Specifically, the shaft support portion 248 includes a main body portion 248a and an outward extending portion 248b.
The main body portion 248a is provided in the main portion 245c over the entire thickness direction of the component main body 241. The outward extending portion 248b protrudes radially outward from the portion of the main body portion 248a on the first surface 241a side. The outward extending portion 248b is thinner than the component main body 241, and is formed in a part of the thickness range of the component main body 241 (thickness range from the intermediate position in the thickness direction to the first surface 241a). It is located in the first surface recess 245d.
In the shaft support portion 248, the outward extension portion 248 b is formed in the first surface recess 245 d, so that the downward movement (movement in the thickness direction of the component main body 241) is restricted by the bottom portion 245 e of the holding recess 245. .
With this structure, the mechanical component 240 can prevent the shaft support portion 248 from falling off and enhance its durability.

(Fourth modification of the first embodiment, machine part)
FIG. 16 is a cross-sectional view schematically showing a machine component 250 that is a fourth modification of the machine component 10 of the first embodiment.
The holding recess 255 formed in the component main body 251 includes a main portion 255c, a first surface recess 255d formed in the first surface 251a, and an outer edge recess 255e formed in the outer edge portion of the first surface recess 255d. .
The main portion 255c is formed on the inner surface 255b of the peripheral edge 255a of the holding recess 255. The outer edge recess 255e is formed in a concave shape toward the second surface 251b on the bottom surface of the outer edge of the first surface recess 255d.

The shaft support portion 258 has a structure that regulates displacement in the thickness direction (relative to the component main body 251). Specifically, the shaft support portion 258 includes a main body portion 258a, an outwardly extending portion 258b, and an outer edge convex portion 258c.
The main body portion 258a is provided in the main portion 255c over the entire thickness direction of the component main body 251. The outward extending portion 258b protrudes radially outward from a portion of the main body portion 258a on the first surface 251a side, and is formed in the first surface recess 255d. The outer edge convex portion 258c protrudes from the outer edge portion of the outward extending portion 258b toward the second surface 251b, and is formed in the outer edge concave portion 255e.
The shaft support 258 is restricted from moving downward (moving in the thickness direction of the component main body 251) by the bottom of the first surface recess 255d and the bottom of the outer edge recess 255e.
With this structure, the mechanical component 250 can prevent the shaft support portion 258 from falling off and enhance its durability.

(Fifth Modification of First Embodiment, Machine Part)
FIG. 17 is a cross-sectional view schematically showing a machine component 260 that is a fifth modification of the machine component 10 of the first embodiment.
The holding recess 265 has a main portion 265c and a first surface recess 265d. The main portion 265c is formed on the inner surface 265b of the peripheral edge 265a of the holding recess 265. The first surface recess 265d is formed in the first surface 261a of the component main body 261.
The shaft support portion 268 has a structure that regulates displacement in the thickness direction (relative to the component main body 261). Specifically, the shaft support portion 268 is thinner than the component main body 261 and is formed in a part of the thickness range of the component main body 261 (thickness range from the intermediate position in the thickness direction to the first surface 261a). The shaft support portion 268 has a constant thickness in the radial direction. A portion including the outer edge of the shaft support portion 268 is formed in the first surface recess 265d.
Since the shaft support portion 268 is partially formed in the first surface recess 265d, downward movement (movement of the component main body 261 in the thickness direction) is restricted by the bottom portion 265e of the holding recess 265.
With this structure, the mechanical component 260 can prevent the shaft support portion 268 from falling off and enhance its durability.

  Hereinafter, an embodiment of a movement and a timepiece according to the present invention will be described with reference to the drawings. In the drawings to be referred to, the scale of each member is appropriately changed in order to make each member a recognizable size.

(clock)
In general, a machine body including a driving part of a timepiece is referred to as a “movement”. A state in which a dial and hands are attached to the movement and put into a watch case to make a finished product is called “complete” of the watch. Of the two sides of the base plate constituting the watch substrate, the side of the watch case with the windshield, that is, the side with the dial is referred to as the “back side” or “dial side” of the movement.
Of the two sides of the main plate, the side with the back cover of the watch case, that is, the side opposite to the dial is referred to as the “front side” or “back side” of the movement.

FIG. 18 is a plan view of the complete.
As shown in FIG. 18, the complete 1 a of the timepiece 1 includes a dial 2 having a scale 3 indicating time information, an hour hand 4 a indicating hour, a minute hand 4 b indicating minute, and a second hand 4 c indicating second. And.
FIG. 19 is a plan view of the movement front side. In FIG. 19, in order to make the drawing easy to see, some of the timepiece components constituting the movement 100 are not shown.

A movement 100 of a mechanical timepiece has a main plate 102 constituting a substrate. A winding stem 110 is rotatably incorporated in the winding stem guide hole 102 a of the main plate 102. The winding stem 110 is positioned in the axial direction by a switching device including a setting lever 190, a yoke 192, a yoke spring 194 and a back presser 196.
Then, when the winding stem 110 is rotated, the hour wheel 112 is rotated through the rotation of the clutch wheel (not shown). The round hole wheel 114 and the square hole wheel 116 are sequentially rotated by the rotation of the hour wheel 112, and the mainspring (not shown) accommodated in the barrel complete 120 is wound up.

The barrel complete 120 is rotatably supported between the main plate 102 and the barrel holder 160. The second wheel 124, the third wheel 126, the fourth wheel 128, and the escape wheel 130 are supported rotatably between the main plate 102 and the train wheel bridge 162.
When the barrel wheel 120 is rotated by the restoring force of the mainspring, the second wheel 124, the third wheel 126, the fourth wheel 128, and the escape wheel 130 are sequentially rotated by the rotation of the barrel wheel 120. The barrel wheel 120, the second wheel 124, the third wheel 126, and the fourth wheel 128 constitute a front wheel train.

When the center wheel & pinion 124 is rotated, a cylindrical pinion (not shown) is simultaneously rotated based on the rotation, and a minute hand 4b (see FIG. 18) attached to the cylindrical pinion displays "minute". .
Further, the hour wheel (not shown) is rotated through the rotation of the minute wheel (not shown) based on the rotation of the hour pinion, and the hour hand 4a (see FIG. 18) attached to the hour wheel is “hour”. Is displayed.

The escapement and speed control device for controlling the rotation of the front train wheel is composed of a escape wheel 130, an ankle 142, and a mechanical component 10 (a balance).
Teeth 130 a are formed on the outer periphery of the escape wheel & pinion 130. The ankle 142 is rotatably supported between the main plate 102 and the ankle receiver 164, and includes a pair of pallets 142a and 142b. The escape wheel 130 is temporarily stopped in a state where one pallet 142a of the ankle 142 is engaged with the teeth 130a of the escape wheel 130.
The mechanical part 10 (the balance) is reciprocated at a constant period, so that one pallet 142a and the other pallet 142b of the ankle 142 are alternately engaged with and released from the teeth 130a of the escape wheel 130. I am letting. Thereby, the escape wheel & pinion 130 is escaped at a constant speed.

  According to the said structure, since the mechanical component of embodiment mentioned above is provided, a movement and timepiece with a high timing accuracy can be provided.

  Note that the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Timepiece 10,10A, 70,80,90,220,230,240,250,260 ... Mechanical part 11,71,81,91,221,231,241,251,261 ... Part main body 12,72,82 , 92 ... Press-fit part 14, 74, 94 ... Central hole part (through hole)
14a, 74a ... Inner edge of the central hole (inner surface of the through hole)
15, 75, 85, 95, 225, 235, 245, 255, 265 ... holding recess (anchor structure)
15c, 75c, 95c ... innermost peripheral position (first position)
15d, 75d ... outermost peripheral position (second position)
DESCRIPTION OF SYMBOLS 19 ... Reception step part 25 ... Contact step part 30 ... Shaft member 31 ... Base material 32 ... 1st mask 50 ... Electroforming apparatus 82 ... Receiving recessed part 95d ... Position where the width dimension of a holding recessed part becomes the maximum (2nd position)
100 ... Movement

Claims (10)

A mechanical part that rotates about a shaft member,
A component main body having a through hole through which the shaft member is inserted;
A press-fitting portion that is formed on the inner surface of the through-hole and is fixed to the shaft member by press-fitting the shaft member;
Wherein the inner surface of the through hole, by retaining at least a portion of the press-hold recess you restrict displacement of the press-fitting portion relative to the component body is formed,
The press-fitting portion is formed of a metal material ,
The holding recess restricts the press-fitting portion from being displaced inward by making the width dimension at the first position smaller than the width dimension at the second position on the outer peripheral side from the first position. Machine parts. A mechanical part that rotates about a shaft member,
A component main body having a through hole through which the shaft member is inserted;
A press-fitting portion that is formed on the inner surface of the through-hole and is fixed to the shaft member by press-fitting the shaft member;
Wherein the inner surface of the through hole, by retaining at least a portion of the press-hold recess you restrict displacement of the press-fitting portion relative to the component body is formed,
The press-fitting portion is formed of a metal material ,
The holding concave portion has a receiving step portion in which the circumferential dimension increases discontinuously toward the outside,
The machine part according to claim 1, wherein the press-fit portion has a contact step portion that contacts the receiving step portion . A mechanical part that rotates about a shaft member,
A component main body having a through hole through which the shaft member is inserted;
A press-fitting portion that is formed on the inner surface of the through-hole and is fixed to the shaft member by press-fitting the shaft member;
Wherein the inner surface of the through hole, by retaining at least a portion of the press-hold recess you restrict displacement of the press-fitting portion relative to the component body is formed,
The press-fitting portion is formed of a metal material ,
The mechanical component according to claim 1, wherein the component main body is formed with a receiving recess for receiving a bulging deformed portion of the press-fitting portion that is generated when the shaft member is press-fitted .   The machine part according to any one of claims 1 to 3, wherein the press-fitting portion is divided at at least one place in a circumferential direction of the component main body. The machine part according to any one of claims 1 to 4 , wherein a part of the press-fitting portion protrudes from an inner surface of the through hole. The mechanical part according to any one of claims 1 to 5 , wherein the press-fitting portion has a displacement regulating structure that regulates displacement in a thickness direction with respect to the component main body. The component body, the mechanical component according to any one of claims 1-6, characterized in that it consists of a brittle material. Movement of comprising the mechanical part according to any one of claims 1-7. A timepiece comprising the movement according to claim 8 . A manufacturing method of a machine part that rotates around a shaft member,
The mechanical component has a component main body having a through-hole through which the shaft member is inserted, and a press-fit portion that is formed on the inner surface of the through-hole and is fixed to the shaft member by being press-fitted into the shaft member. the on the inner surface of the through hole, hold the recess you restrict displacement of the press-fitting portion relative to the component body by holding at least a portion of the press-fitting portion is formed,
A mask having an inner shape corresponding to the shape of the press-fit portion and an outer shape corresponding to the outer shape of the component main body is formed on at least one surface of the base material to be the component main body, and is matched to the inner shape of the mask Forming the holding recess in the substrate;
Forming the press-fit portion made of a metal material by electroforming so that at least a portion is held in the holding recess;
And a step of removing unnecessary portions of the base material in accordance with the outer shape of the mask.

Images