JP3230221U - Support structure for balance with a mechanical watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure for a balance with a balance plate, which can prevent or suppress a large deflection of the cantilever balance sheet even when an impact force is input. SOLUTION: One end of a balance with hairspring 30 is fixed, and one end 22b of the balance with hairspring 22 is supported on the side opposite to one end with a central portion thereof, and one end of the balance with hairspring 22 is supported with respect to one end. The amount of deflection of the hole stone 32 and the receiving stone 33 that support the balance sheet 22 when the balance sheet 22 is bent with one end as a fixed end in a portion close to the portion is such that the balance sheet 22 deviates from the balance sheet 30. A regulating portion 31b is formed to regulate the bending of the balance with hairspring 30 by hitting the weight kana 82b when it is bent so as not to be within the range. [Selection diagram] Fig. 3

Description

The present invention relates to a support structure for a balance with hairspring in a mechanical timepiece.

Mechanical timepieces are equipped with a balance as a speed governor that regulates the rate of the timepiece. The balance wheel is equipped with a wheel-shaped balance spring, a balance spring, and a balance spring, which is a shaft fixed to the center of the balance spring. The balance sheet is supported by inserting one end of the balance sheet into the mortise hole of the main plate and the other end of the balance sheet into the mortise hole of the balance sheet.

Here, some balance holders are cantilevered. That is, one end side of the balance with hairspring holder is fixed to an immovable member such as the main plate of the movement, and the other end side that is not fixed supports one end of the balance with hairspring.

Japanese Unexamined Patent Publication No. 2020-003427

Here, a watch used in a harsher environment than a normal environment, such as a diver's watch, may be subject to a strong impact, and the fixed end of the balance sheet is affected by the input impact force. The deflection at the center may increase. When the distance between the main plate and the balance sheet along the axial direction of the balance sheet becomes larger than a predetermined amount due to this bending, the balance sheet may come off or tilt with respect to the original supported state. There is. The accuracy of timekeeping is reduced for the balance with hairspring in such a state.

The present invention has been made in view of the above circumstances, and provides a support structure for a balance with a balance with which the cantilever balance holder can be prevented or suppressed from bending significantly even when an impact force is input. The purpose.

The present invention is a structure for supporting a balance sheet in a mechanical timepiece, which supports a balance sheet that rotatably supports one end of the balance sheet. The balance sheet is fixed at one end and sandwiches a central portion. One end of the balance sheet is supported on the side opposite to one end portion, and the balance sheet is bent toward a portion closer to the portion supporting one end of the balance sheet than the one end portion with the one end portion as a fixed end. The amount of deflection at the portion supporting the balance sheet at the time is within a range in which the balance sheet does not come off from the balance sheet, and when the balance sheet is bent, it hits another member to reduce the deflection of the balance sheet. It is a support structure for the balance sheet in a mechanical watch, in which a regulatory part is formed.

According to the support structure of the balance sheet in the mechanical timepiece according to the present invention, it is possible to prevent or suppress the cantilever balance sheet from being greatly bent even if an impact force is input.

It is a top view (the state which only the weight kana of the rotary weights is displayed) which saw the movement which has the support structure of the balance sheet in the mechanical timepiece of one Embodiment of this invention from the back cover side of a mechanical timepiece. FIG. 1 is a plan view (a state in which the entire rotary weight is displayed) of the movement shown in FIG. 1 as viewed from the back cover side of the mechanical timepiece. It is sectional drawing which shows the cross section along the line AA in FIG.

Hereinafter, embodiments of a balance withholding support structure in the mechanical timepiece according to the present invention will be described with reference to the drawings. 1 and 2 are plan views of a movement 10 having a support structure for a balance with hairspring 30 in a mechanical timepiece according to an embodiment of the present invention, as viewed from the back cover side of the mechanical timepiece, and FIG. 1 is a plan view for automatic winding. Of the rotary weights 80, only the weight kana 82 is displayed, and FIG. 2 shows the entire rotary weight 80. FIG. 3 is a cross-sectional view showing a cross section taken along the line AA in FIG.

The support structure of the balance with hairspring 30 in the mechanical timepiece of the present embodiment is provided in the movement 10 of the mechanical timepiece. As shown in FIGS. 1 to 3, the movement 10 is provided with a balance with hairspring 20 that defines the accuracy of the mechanical timepiece.

The balance wheel 20 includes a wheel-shaped balance spring 21, a balance spring 23, and a balance spring 22 which is a shaft fixed to the center of the balance spring 21. In the balance sheet 20, as shown in FIG. 3, one end 22a of the balance sheet 22 is supported by the main plate 40, the other end 22b of the balance sheet 22 is supported by the balance sheet 30, and between the main plate 40 and the balance sheet 30. , Rotation (reciprocating) is free.

The main plate 40 is arranged on the dial 50 side in the movement 10. The balance with hairspring 30 is arranged on the back cover side of the mechanical timepiece in the movement 10.

Here, the main plate 40 includes a receiving stone 43 and a hole stone 42 in which a penetrating mortise hole is formed. A mortise at one end 22a of the balance sheet 22 is inserted into the tenon hole of the hole stone 42, and the hole stone 42 regulates the movement of the balance sheet 22 in the direction orthogonal to the axis (radial direction). The receiving stone 43 is arranged on an extension of one end 22a of the balance sheet 22 protruding from the penetrating mortise hole.

The balance sheet 30 also includes a receiving stone 33 and a hole stone 32 having a penetrating mortise hole formed in the balance sheet main body 31. The tenon of the other end 22b of the balance sheet 22 is inserted into the tenon hole of the hole stone 32, and the hole stone 32 regulates the movement of the balance sheet 22 in the direction orthogonal to the axis (radial direction). The receiving stone 33 is arranged on an extension of the other end 22a of the balance sheet 22 protruding from the penetrating mortise hole.

The hole stones 32 and 42 rotatably support the balance sheet 22. The distance between the receiving stone 43 and the receiving stone 33 is set to be slightly longer than the length of the balance sheet 22. As a result, the two receiving stones 33 and 43 regulate the axial movement of the balance sheet 22.

As shown in FIGS. 1 and 2, only one end portion 31a, which is a portion biased in a predetermined direction from the central portion, of the balance sheet receiving main body 31 is fixed to the immovable main plate 40 by screws 35. That is, the balance sheet main body 31 is supported by the main plate 40 like a cantilever beam to which one end 31a is fixed.

Further, the hole stone 42 and the receiving stone 43 are arranged on the side opposite to one end portion 31a with the central portion of the balance sheet receiving main body 31 interposed therebetween. Therefore, when a relatively large impact force is input to the mechanical timepiece provided with the movement 10, the cantilevered balance with hair receiving body 31 is centered on the one end portion 31a fixed with the screw 35, and the shaft of the balance with hairspring 22. Bend in the direction.

Here, for example, in the case of a watch such as a diver's watch, which is expected to input a relatively large impact depending on the usage environment, when such a relatively large impact force is actually input, the balance with hairspring is received. The amount of deflection increases. Therefore, in the case of the conventional support structure of the balance sheet to which the present invention is not applied, the distance between the receiving stone 43 and the receiving stone 33 becomes large (the interval is widened), and the balance sheet 22 comes off from the mortise hole. There is a fear.

On the other hand, in the support structure of the balance sheet 30 of the present embodiment, the hole stone 42 and the receiving stone 43 that support the balance sheet 22 are arranged rather than the one end portion 31a of the balance sheet receiving body 31 fixed by the screw 35. The amount of deflection of the sewn part is regulated.

That is, in the balance sheet receiving main body 31, the regulating portion 31b is formed at a position closer to the portion where the hole stone 42 and the receiving stone 43 supporting the balance sheet 22 are arranged than the one end portion 31a which is the fixed end. The restricting portion 31b has the hole stone 32 and the receiving stone 33 in the balance sheet main body 31 on the opposite side of the one end portion 31a (centering on the hole stone 32 and the receiving stone 33, the one end portion 31a and the regulating portion 31b). It is located in the area (on the side separated by an angle exceeding 90 [degrees]).

When the regulating portion 31b regards the balance with hairspring receiving body 31 as a cantilever with one end portion 31a as a fixed end, the regulating portion 31b supports a portion (hole stone 32 and a receiving stone) that supports the balance sheet when the balance sheet receiving body 31 bends. The deflection of the balance with hairspring 22 is regulated so that the amount of deflection in 33) does not deviate from both the balance with hairspring receiver 30 and the main plate 40. Then, as shown in FIG. 3, the regulating portion 31b is arranged on the back side (not the back cover side but the movement 10 side) of the weight kana 82 of the rotary weight 80.

The rotary weight 80 is arranged between the movement 10 and the back cover. The rotary weight 80 has a rotation center corresponding to the center of the dial 50 provided on the main plate 40 side. The rotary weight 80 includes a central portion 82, an arm portion 81, and a weight portion 83.

The central portion 82 includes a cylindrical boss 82a formed around the center of rotation and a weight kana 82b formed on the outside of the boss 82a. The weight portion 83 is arranged at a position separated from the center of rotation by a predetermined distance, and is formed in an arc shape. The arm portion 81 connects the central portion 82 and the weight portion 83.

When the rotary weight 80 rotates around the center of rotation, the weight kana 82b provided in the central portion 82 also rotates integrally. The weight kana 82 meshes with the train wheel mechanism of the movement 10, and when the weight kana 82 rotates, the mainspring, which is the power source of the mechanical timepiece, is wound up via the train wheel mechanism.

As shown in FIG. 3, the regulating portion 31b is arranged on the dial 50 side of the weight kana 82 with a predetermined gap along the thickness direction of the timepiece with the weight kana 82b. The predetermined gap is, for example, about 200 [μm], but the size of the predetermined gap may be larger or smaller than 200 [μm].

That is, in a state where the balance with hairspring receiving body 31 is bent so that the displacement amount of the regulation portion 31b becomes the size of this predetermined gap, the balance with hairspring 22 comes out of the mortise holes of either of the hole stones 32 and 42. It is good if there is no.

It should be noted that the predetermined gap is secured to such that the weight kana 82b and the regulation portion 31b in the non-flexible state do not come into contact with each other even if the center portion 82 is shaken (change in inclination) when the rotary weight 80 rotates. It is preferable to do so.

According to the support structure of the balance with hairspring 30 in the mechanical timepiece of the present embodiment configured as described above, when the cantilevered balance with hairspring 30 bends due to the input of impact force or the like, the regulating portion 31b also bends. , The regulation unit 31b hits the weight kana 82b.

When the regulating portion 31b hits the weight kana 82b, it does not bend any more. Therefore, the maximum amount of bending of the regulating portion 31b is between the regulating portion 31b and the weight kana 82b when the balance with hairspring 30 is not bent. It becomes the size of the set predetermined gap.

Then, when the amount of bending of the regulating portion 31b becomes the size of the predetermined gap, the cantilever balance holder 30 is prevented or suppressed from being greatly bent. That is, when the amount of deflection of the regulating portion 31b becomes the size of the predetermined gap, the deflection of the balance sheet 30 is such that the balance stone 22 is one of the hole stones 32 in the portion where the hole stone 32 and the receiving stone 33 are arranged. , The amount of deflection that does not come out of the 42 mortise holes is regulated.

Therefore, in the support structure of the balance sheet 30 of the present embodiment, even if a large impact force is input, the balance sheet 30 is not in a normal state supported by the mortises 32 and 42 (for example, the balance sheet). The balance sheet 30 can be operated normally without being disengaged from the mortise hole and tilting the balance sheet.

Also, even if the tenon comes off the tenon, the amount of the detachment is small, so the tenon (the end of the tenon) that comes off the tenon returns to its original state and occurs when it comes off slightly. Damage to the tenon can be prevented or reduced. As a result, it is possible to prevent the mortise and tenon from coming off from the pallet fork and the mortise and tenon to be crushed, and to keep the timekeeping function of the mechanical timepiece normal.

Further, in the support structure of the balance with hairspring 30 of the present embodiment, the regulation portion 31b of the balance with hairspring receiver 31 sandwiches the hole stone 32 and the receiving stone 33 for supporting the balance with hairspring 22, and is different from one end portion 31a which is a fixed end. It is formed in a region on the opposite side (a side in which one end portion 31a and the regulating portion 31b are separated by an angle exceeding 90 [degrees] from the center of the hole stone 32 and the receiving stone 33). Therefore, the amount of bending of the hole stone 32 and the receiving stone 33 can always be made smaller than the maximum amount of bending that the regulating portion 31b can bend (the dimension of the gap between the regulating portion 31b and the weight kana 82b).

In the support structure of the balance with hairspring according to the present invention, the regulating portion 31b sandwiches the hole stone 32 and the receiving stone 33 for supporting the balance sheet 22 and is on the same side as the one end portion 31a (hole stone 32 and the receiving stone) which is a fixed end. One end portion 31a and the regulating portion 31b may be formed in a region of the stone 33 at a right angle within 90 [degrees]). In this case as well, the regulating portion 31b is arranged at a position closer to the hole stone 32 and the receiving stone 33 than the one end portion 31a.

According to the support structure arranged in this way, the amount of bending in the hole stone 32 and the receiving stone 33 is the maximum amount of bending that the regulating portion 31b can bend (the dimension of the gap between the regulating portion 31b and the weight kana 82b). By setting the dimension of the gap between the regulation part 31b and the weight kana 82b to be smaller. It is possible to suppress the amount of deflection of the balance sheet 22 so that it does not come out of the mortise holes of either of the hole stones 32 and 42.

Further, in the support structure of the balance sheet 30 of the present embodiment, one end portion 31a of the balance sheet receiving body 31 is arranged on the outer peripheral side of the mechanical timepiece, and a hole stone is placed near the other end portion of the balance sheet receiving body 31. 32 and the receiving stone 33 are arranged. Therefore, the restricting portion 31b formed on the other end side is arranged on the central portion side of the mechanical timepiece in a plan view seen from the back cover side of the mechanical timepiece, and is covered with the existing weight kana 82b (arrangement). (Arrangement on the back side of the weight kana).

Therefore, it is not necessary to newly provide a member for covering the regulation portion 31b arranged on the central portion side of the mechanical timepiece, and the cost can be reduced as compared with the case where such a member is newly provided.

Further, the support structure of the balance with hairspring 30 of the present embodiment is arranged to be covered with a weight kana 82b arranged on the central side of the mechanical timepiece, but if it is a member arranged on the central part side of the mechanical timepiece, Often, the weight is not limited to 82b.

However, since the rotary weight 80 is arranged on the outermost side on the back cover side in the thickness direction of the movement 10, the arrangement of covering the regulating portion 31b with the weight kana 82b is the last arrangement for assembling the rotary weight 80 to the movement 10. Since the size of the gap between the regulating portion 31b and the weight kana 82b can be adjusted in the process, the assembly work can be performed efficiently.

In the support structure of the balance with hairspring 30 of the present embodiment, at least one of the weight kana 82b with which the regulation part 31b and the regulation part 31b abuts (regulation part 31b or weight kana 82b) and the other (weight kana 82b or regulation part 31b). It is also possible to arrange an elastic member on the surface (end surface) that abuts against.

In this way, in the configuration in which the elastic member is arranged on at least one surface of the regulation portion 31b and the weight kana 82b, the elastic member relaxes the impact force when the regulation portion 31b and the weight kana 82b abut, so that the regulation portion Damage can be prevented or suppressed by the collision of 31b with the weight or 82b. As such an elastic member, rubber, silicon, fluororesin, other resin, or the like can be applied.

In the support structure of the balance with hairspring 30 of the present embodiment, the one that supports the balance with hairspring 30 and the main plate 40 and the balance with hairspring 20 is illustrated. It is not limited to those who support the clock. That is, in the balance with hairspring support structure according to the present invention, the member that supports the balance sheet together with the balance sheet is not limited to the main plate, and may be a member that supports the balance sheet other than the main plate.

Further, in the support structure of the balance with hairspring 30 of the present embodiment, one end 31a of the balance with hairspring 30 is fixed to the main plate 40 by screws 35, but the member to which the one end 31a is fixed is attached to the main plate 40. It is not limited, and may be another non-moving member.

Further, what fixes one end 31a of the balance with hairspring 30 to a non-moving member such as the main plate 40 is not limited to the screw 35, and may be fixed by, for example, a fitting structure or adhered. It may be fixed by such as.

22 Temper 22b One end 30 Tempre receiver 31 Temp holder body 31a One end 31b Restriction part 32 Hole stone 33 Receiving stone 80 Rotating weight 83 Weight part

Claims (4)

It is a support structure for the balance sheet in a mechanical watch that supports the balance sheet that rotatably supports one end of the balance sheet.
One end of the balance sheet is fixed, and one end of the balance sheet is supported on the side opposite to the one end portion with the central portion interposed therebetween, and the balance plate holder is closer to the portion supporting one end of the balance sheet than the one end portion. Flexion so that the amount of deflection at the portion supporting the balance sheet when the balance sheet is bent with the one end portion as a fixed end is within a range in which the balance sheet does not come off from the balance sheet. A support structure for a balance sheet in a mechanical timepiece, in which a regulating portion is formed to regulate the deflection of the balance sheet by hitting another member at the time. One end of the balance sheet is arranged on the outer peripheral side of the mechanical timepiece, and the restricting part is arranged on the center side of the mechanical timepiece.
The restricting portion is arranged on the back side of the weight kana of the rotary weight provided in the mechanical timepiece along the thickness direction of the mechanical timepiece with a predetermined distance from the weight kana. The support structure for the balance sheet in the mechanical timepiece according to claim 1, which regulates the deflection of the balance sheet. The support structure for a balance sheet in a mechanical timepiece according to claim 1 or 2, wherein the restricting portion is formed in a region opposite to the one end portion with a portion supporting the balance plate. The aspect according to any one of claims 1 to 3, wherein an elastic member for alleviating an impact force at the time of abutting is arranged on a surface of at least one of the regulating portion and the other member that abuts the other. Support structure for the balance sheet in mechanical watches.