CH715052B1 - Constant torque mechanism, timepiece movement, and timepiece. - Google Patents

Abstract

The present invention relates to a constant torque mechanism, a timepiece movement and a timepiece in which the fluctuation of the torque transmitted to an escapement is suppressed. The constant torque mechanism (30) includes a carrier (47) rotating about a first axis of rotation (O1) with power from a movement barrel, a planetary gear wheel (45) rotatably mounted on the carrier, a constant force spring (100) being energized by the rotation of the bracket, a lower level constant force wheel (60) rotating with the energy of the constant force spring (100), and transmitting the energy of the spring to constant force (100) to an escapement, the base (95) of a lever spring (94) rotating clockwise around the first axis of rotation (O1) in synchronization with the rotation of the wheel with lower level constant force (60), and a stone forming an engagement claw (86) rotating clockwise about the first axis of rotation (O1) in accordance with the rotation of the base (95 ), engageable with and disengageable from the planetary gear wheel (45), by meshing with the planetary gear wheel (45) when it is within the rotation envelope (M) of the planetary gear wheel (45) to restrict the rotation of the planetary gear wheel ( 45), and then being moved relative to the base (95) so as to be able to withdraw outside the rotational envelope (M) of the planetary gear wheel (45).

Description

BACKGROUND OF THE INVENTION

1. Field of the invention

The present invention relates to a constant torque mechanism, a timepiece movement, and a timepiece.

2. Description of prior art

[0002] Generally, in a mechanical timepiece, when a torque (energy) transmitted from a movement barrel to an escapement varies according to the degree of winding of the mainspring, the angle of oscillation of the spiral balance changes according to the fluctuation of the torque, causing a change in the rate of a timepiece, that is to say a delay or a certain advance of the timepiece. Consequently, constant torque mechanisms are known for transmission paths of energy from the barrel of the movement to the escapement in order to eliminate any fluctuation of the torque transmitted to the escapement.

[0003] Different types of constant torque mechanism of this type are proposed and, for example, in the case where the focus is on periodic control, they can mainly be classified into three systems consisting of: cam systems, using gear trains, and planetary wheel systems.

[0004] The constant torque mechanism based on a cam system comprises, for example, a follower or a fork engaging with a cam connected to a cog on the exhaust side and oscillating according to the rotation of the cam, and periodically coming into engagement and disengaging from an engagement and disengagement claw provided on the follower or the fork and which cooperates with an escapement wheel kinematically connected to a cog arranged on the side of the energy source for the control of a cycle of engagement and disengagement. Consequently, it is possible to wind a constant torque spring between the gear train located on the side of the energy source and the gear train located on the side of the escapement.

[0005] In the constant torque mechanism based on a gear train system, the cog located on the power source side and the cog located on the exhaust side are interconnected by a differential mechanism, and the engagement and release claw engaging with a stop wheel and then disengaging from it, penetrates inside the disk corresponding to the casing of the stop wheel, and comes out of the latter, so that it is possible to periodically monitor a phase difference.

For example, as described in Swiss patent application CH-A-296060 (patent document 1) and Swiss patent application CH-A-707938 (patent document 2), the constant torque mechanism using a A planetary wheel system includes a planetary mechanism using the stop wheel as a planetary wheel, and it is possible to periodically check the phase difference between the cog located on the power source side, and the cog located on the power side escapement by the planetary mechanism. The planet wheel performs a complete revolution around a sun wheel while turning on itself to follow the engagement and release claw provided in the sun wheel kinematically connected to the cog located on the escapement side in order to periodically engaged with the engagement and release claw, then to free itself from it.

[0007] Meanwhile, in the constant torque mechanism based on a planet wheel system, in a state where the tip of a tooth of the planet wheel and the engagement and disengagement claw are in contact with each other, the direction of the force applied between the sun gear and the engaging and disengaging claw is along a normal direction of the contact portion between the sun gear and the engaging and disengaging claw. Therefore, immediately before the planet wheel and the engagement and disengagement claw are released from each other, in a state where the tooth tip of the planet wheel and a corner of the engagement claw and disengagement are in contact with each other, the direction of the force applied between the sun wheel and the engagement and disengagement claw approaches the direction of rotation of the engagement and disengagement claw. Consequently, a torque transmitted from the sun wheel provided with the engagement and disengagement claw to the escapement increases and the angle of oscillation of the hairspring balance changes.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, the patent application aims to provide a constant torque mechanism, a timepiece movement and a timepiece in which any fluctuation of a torque transmitted to an escapement is removed.

The constant torque mechanism according to this aspect of the present patent application comprises a support rotating around a first axis using energy supplied by an energy source; a planetary gear wheel being rotatably mounted on the carrier and performing one full revolution about the first axis while rotating about a second axis; a constant force spring being energized by the rotation of the bracket; a constant-force wheel rotating by the energy of the constant-force spring and transmitting the energy of the constant-force spring to an escapement; a synchronous rotating part rotating in a first direction of rotation around the first axis in synchronization with the rotation of the constant force wheel; and an engagement claw rotating in the first direction of rotation in accordance with the rotation of the synchronous rotating part, capable of engaging with and disengaging from the planetary gear wheel, engaging with the wheel planetary gear when it is in a rotational envelope of the planetary gear wheel to restrict the rotation of the planetary gear wheel, and then being moved relative to the synchronous rotating part so as to be able to be removed outside the rotation envelope, the engagement claw being moreover moved in a direction extending along the first direction of rotation with respect to the synchronous rotary part to withdraw from the rotation envelope.

[0010] According to this configuration, the engagement claw is moved relative to the synchronous rotary part so as to withdraw outside the rotation envelope of the planetary gear wheel, so that it is possible to reduce the torque transmitted, according to the first direction of rotation, from the planetary gear wheel to the synchronous rotary part via the engagement claw immediately before the clearance between the planetary gear wheel and the engagement claw. Therefore, it is possible to suppress any fluctuation in the torque transmitted from the synchronous rotating part to the escapement via the constant-force wheel. Consequently, it is possible to suppress the fluctuation of the torque transmitted to the exhaust.

[0011] On the other hand, when the direction of the force applied between the planetary gear wheel and the engagement claw immediately before the disengagement of the planetary gear wheel from the engagement claw approaches the first direction of rotation, the engagement claw is compressed by the planetary gear wheel, and the engagement claw can be moved relative to the synchronous rotating part. Thus, the torque according to the first direction of rotation transmitted from the planetary gear wheel to the synchronous rotary part via the engagement claw is attenuated by the movement of the engagement claw. Therefore, it is possible to suppress the fluctuation of the torque transmitted from the synchronous rotating part to the escapement via the constant-force wheel.

In the constant torque mechanism according to the invention, it is desirable that the constant torque mechanism further comprises an elastic element directly or indirectly compressing the engagement claw inwardly of the rotation envelope.

[0013]According to this configuration, it is possible to eliminate the fact that one can remain in a state in which the engagement claw is in a retracted position where it no longer encroaches on the rotation envelope of the wheel planetary gear. Thus, it is possible to functionally stabilize the engagement and disengagement operation of the engagement claw with respect to the planetary gear wheel.

In the constant torque mechanism according to the invention, it is desirable that the constant torque mechanism further comprises a lever body rotatably carrying the engagement claw relative to the synchronous rotary part, and being arranged in a dissociated manner with respect to the elastic element.

According to this configuration, it is possible to stably support the engagement claw compared to the case where the engagement claw is supported by the part formed by the spring itself. Therefore, it is possible to stabilize the movement of the engagement claw with respect to the synchronous rotating part and functionally stabilize the operation of engaging and disengaging the engagement claw with respect to the gear wheel planetary.

In the constant torque mechanism according to the invention, it is desirable for the engagement claw to be supported by the elastic element.

According to this configuration, it is possible to reduce the number of components compared to the case of a configuration in which the engagement claw is not supported directly by the elastic element.

[0018] In the constant torque mechanism according to the invention, it is desirable that the synchronous rotating part comprises a first limiting part restricting the displacement of the engagement claw, when it is in engagement with the gear wheel. planetary, in a direction along a second direction of rotation around the first axis with respect to the synchronous rotating part.

According to this configuration, when the engagement claw rotates in the first direction of rotation with the synchronous rotary part, the engagement claw moves in the direction corresponding to the second direction of rotation opposite to the first direction of rotation. rotation with respect to the synchronous rotating part, so that it is possible to prevent the fact that the engagement claw can no longer be released from the planetary gear wheel. Therefore, it is possible to functionally stabilize the engagement and disengagement operation of the engagement claw with respect to the planetary gear wheel.

[0020] In the constant torque mechanism according to the invention, it is desirable for the synchronous rotating part to comprise a second limiting part restricting the movement of the engagement claw in a retracted position outside the rotation envelope according to a direction corresponding to the first direction of rotation with respect to the synchronous rotating part.

According to this configuration, when the engagement claw withdraws outside the rotation envelope of the planetary gear wheel, the engagement claw moves in the direction corresponding to the first direction of rotation with respect to the synchronous rotating part, but in such a way that it is possible to prevent the fact that the engagement claw can no longer penetrate again within the rotational envelope of the planetary gear wheel and end up in commitment position. Therefore, it is possible to functionally stabilize the engagement and disengagement operation of the engagement claw with respect to the planetary gear wheel.

In the constant torque mechanism according to the invention, it is desirable for the engagement claw to be arranged so as to be able to oscillate around the first axis with respect to the synchronous rotating part.

According to this configuration, a shaft extending along the first axis and supporting the synchronous rotating part can be used as a shaft which movably supports a member to which the engagement claw is attached with respect to the synchronous rotating part. . On the other hand, in a case where the engagement claw is arranged so as to be able to oscillate around an axis different from the first axis with respect to the synchronous rotating part, it is necessary to separately provide the shaft arranged on the axis different from the first axis in the synchronous rotary part since the shaft movably supporting the member to which the engagement claw is attached relative to the synchronous rotary part. Consequently, it is possible to reduce the number of components compared to the case where the engagement claw is arranged so as to be able to oscillate around an axis different from the first axis with respect to the synchronous rotating part.

[0024] In the constant torque mechanism according to the invention, it is desirable for the engagement claw to be arranged so as to be able to oscillate around a third axis different from the first axis and from the second axis with respect to the rotating part. synchronous.

According to this configuration, since a rotary shaft for the engagement claw is arranged on a third axis different from the first axis, it is possible to improve the degree of freedom in the design of the constant torque mechanism.

[0026] A timepiece movement according to the present patent application comprises the constant torque mechanism described above.

[0027] A timepiece according to this patent application comprises the timepiece movement described above.

In such a configuration, since a constant torque mechanism is provided in which a fluctuation of the torque transmitted to the escapement is suppressed, it is possible to provide a timepiece movement and a timepiece with high precision.

According to one aspect of the present patent application, it is possible to provide a constant torque mechanism, in which any fluctuation in the torque transmitted to the escapement is suppressed, as well as such a timepiece movement, and such a timepiece.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 is an external view of a timepiece according to a first embodiment. Figure 2 is a block diagram of a movement according to the first embodiment. Figure 3 is a perspective view of part of the movement according to the first embodiment taken from above. Figure 4 is a sectional view illustrating part of the movement according to the first embodiment. Figure 5 is a plan view of part of the movement of the first embodiment taken from above. Fig. 6 is a plan view of an engagement and disengagement lever unit according to the first embodiment taken from above. Fig. 7 is a sectional view illustrating the engagement and release lever unit of the first embodiment. Fig. 8 is a perspective view of a sun gear and the engagement and disengagement lever unit of the first embodiment taken from above. Fig. 9 is a perspective view of the planet wheel and the engagement and disengagement lever unit of the first embodiment taken from below. Fig. 10 is a plan view of part of a constant torque mechanism of the first embodiment seen from above. Fig. 11 is an explanatory view of the operation of the constant torque mechanism of the first embodiment. Fig. 12 is an explanatory view of an operation of the constant torque mechanism according to the first embodiment. Fig. 13 is an explanatory view of the operation of the constant torque mechanism according to the first embodiment. Fig. 14 is an explanatory view of the operation of the constant torque mechanism according to the first embodiment. Fig. 15 is a plan view of a planet wheel and an engagement and disengagement lever unit according to a second embodiment, as viewed from above. Fig. 16 is an explanatory view of the operation of a constant torque mechanism according to the second embodiment. Fig. 17 is a plan view of a sun gear and an engagement and disengagement lever unit according to a third embodiment as viewed from above. Fig. 18 is an explanatory view of the operation of a constant torque mechanism according to the third embodiment. Fig. 19 is a plan view of a planet wheel and an engagement and disengagement lever unit according to a fourth embodiment as viewed from above. Fig. 20 is an explanatory view of an operation of a constant torque mechanism according to the fourth embodiment.

DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. In the following embodiment, a mechanical timepiece will be described as an example for a timepiece.

[First embodiment]

(Basic configuration of the timepiece)

[0032] Generally, the mechanical body comprising a drive part for the timepiece is referred to as a “movement”. A state in which a dial and hands are attached to the movement, placed in a timepiece case, and assembled to form a finished product is referred to as constituting an "assembly" of the timepiece.

Among the two faces of a plate constituting a base plate of the timepiece, reference is made to the side provided with the crystal closing the case of the timepiece (that is to say, the dial side) as being the “rear face” of the movement. Furthermore, among the two sides of the plate, the side possessing the back of the timepiece case (i.e., the side opposite the dial) is referred to as being the "front side" of the movement.

Furthermore, according to the embodiment described, a description is given in which the direction going from the dial towards the bottom of the case is defined as being the direction "up" and the direction opposite to it is defined. as the "down" direction. Also, the clockwise direction seen from above is defined as clockwise and the counterclockwise direction seen from above is defined as counter-clockwise taking each axis of rotation as the center.

Figure 1 is an external view of the timepiece according to the first embodiment.

As illustrated in Figure 1, an assembly of a timepiece 1 according to this embodiment comprises a movement 10 (the movement of the timepiece), a dial 3 having indicators indicating related information at least at the current time, and hands 4 including an hour hand 5, a minute hand 6, and a seconds hand 7 in the case of the timepiece consisting of a case back (not shown ) and an ice cream 2.

Figure 2 is a block diagram of the movement according to the first embodiment.

As illustrated in Figure 2, the movement 10 comprises a movement barrel 11 which constitutes a source of energy, a cog located on the side of the energy source 12 connected to the barrel of the movement 11, an escapement 14 whose the speed is controlled by a speed regulator 13, a gear train located on the side of the escapement 15 connected to the escapement 14, and a constant torque mechanism 30 disposed between the gear train located on the side of the energy source 12 and the cog located on the exhaust side 15.

[0039] In addition, the constant torque mechanism 30 generally forms part of a front gear train including a second mobile, a third mobile, a fourth mobile, and the like. The cog located on the side of the energy source 12 according to the embodiment described is a cog positioned on the side of the barrel of the movement 11, which is the energy source of the constant torque mechanism 30, seen from the torque mechanism 30. Similarly, the cog located on the side of the escapement 15 according to the described embodiment is a cog positioned on the side of the escapement 14 with respect to the constant torque mechanism 30, seen from the constant torque mechanism 30.

A mainspring 16 is housed in the barrel of the movement 11. The mainspring 16 is wound under the action of the rotation of a winding stem (not shown) connected to a crown 17 illustrated in Figure 1. The barrel of the movement 11 rotates with an energy (torque) which is a function of the unwinding of the mainspring 16, and the energy is transmitted to the constant torque mechanism 30 via the gear train located on the side of the energy source 12. In addition , in this embodiment, the case where the energy is transmitted from the movement barrel 11 to the constant torque mechanism 30 via the gear train located on the side of the energy source 12 is described by way of example, but the present invention is not limited to such a case. For example, the energy of the movement barrel 11 can be directly transmitted to the constant torque mechanism 30 without the gear train located on the side of the energy source 12.

For example, the cog located on the side of the energy source 12 comprises a first transmission wheel 18. The first transmission wheel 18 is, for example, the third mobile. The first transmission wheel 18 is essentially supported between a plate 23 (see Figure 4) and a gear bridge (not shown). The first transmission wheel 18 rotates based on the rotation of the barrel of the movement 11. In addition, when the first transmission wheel 18 rotates, a pinion (not shown) rotates based on this rotation. The minute hand 6 shown in Figure 1 is attached to the pinion and the minute hand 6 displays the current minutes via the rotation of the pinion. The minute hand 6 rotates at a speed of rotation controlled by the escapement 14 and the speed regulator 13, that is to say by carrying out a complete revolution in one hour.

[0042] In addition, when the first transmission wheel 18 rotates, a minute wheel (not shown) rotates based on this rotation and an hour wheel (not shown) rotates based on the rotation of the hour wheel. minutes. The hour hand 5 shown in Figure 1 is attached to the hour wheel and the hour hand 5 indicates the current time via the rotation of the hour wheel. The hour hand 5 rotates at a rotational speed controlled by the escapement 14 and the speed regulator 13, and performs, for example, one revolution in 12 hours.

The cog located on the side of the escapement 15 mainly comprises a second transmission wheel 19. The second transmission wheel 19 is, for example, the fourth mobile. The second transmission wheel 19 is essentially supported between the plate 23 and the gear bridge, and rotates based on the rotation of a lower level constant force wheel 60 of the constant torque mechanism 30, which will be described later. . In the case where the second transmission wheel 19 is the fourth mobile, the seconds hand 7 illustrated in FIG. 1 is fixed to the second transmission wheel 19 and the seconds hand 7 indicates the current seconds on the basis of the rotation of the second transmission wheel 19. The seconds hand 7 rotates at a rotational speed controlled by the escapement 14 and the speed regulator 13 to perform, for example, a complete revolution in one minute.

[0044] The escapement 14 mainly includes an escapement wheel set and an anchor (neither of which is shown).

[0045] The escape wheel set is essentially supported between the plate 23 and the gear bridge, and, for example, meshes with the second transmission wheel 19. Consequently, the energy transmitted from a constant-force spring 100 describes later in the constant torque mechanism 30 is transmitted to the escapement wheel set via the gear train located on the escapement side 15. Consequently, the escape wheel set rotates with the energy of the constant force spring 100.

The anchor is pivotally mounted (that is to say so as to be able to oscillate) between the plate 23 and an anchor bridge (not shown), and has a pair of claws made in the form of stones ( not shown). The pair of claws in the form of stones is alternately engaged with an escapement gear, and released from the latter by the speed regulator 13 in the escapement wheel set according to a predetermined cycle. Consequently, the escape wheel set is capable of operating according to a predetermined cycle.

[0047] The speed regulator 13 mainly comprises a spiral balance wheel (not shown).

The spiral balance includes a balance shaft, a balance wheel, and a hairspring, and is essentially supported between the plate 23 and a balance bridge (not shown). The hairspring balance rotates in a reciprocal manner (forward and backward rotation) at a constant angle of rotation with the hairspring as the power source.

(Constant torque mechanism configuration)

The constant torque mechanism 30 is a mechanism for suppressing any energy fluctuation (torque fluctuation) transmitted to the escapement 14.

[0050] Figure 3 is a perspective view of part of the movement of the first embodiment, seen from above.

As shown in Fig. 3, the constant torque mechanism 30 includes a fixed wheel 31 having a first axis of rotation 01 extending vertically as a central axis, an upper level constant force wheel 40 rotating around of the first rotation axis 01, the lower-level constant-force wheel 60 (constant-force wheel) coaxially disposed with the upper-level constant-force wheel 40 and rotatable with respect to the upper-level constant-force wheel 40 about the first axis of rotation 01, an engagement and disengagement lever unit 80 cooperating with the upper-level constant-force wheel 40 and the lower-level constant-force wheel 60, the constant-force spring 100 transmitting a energy accumulated at the upper level constant force wheel 40 and the lower level constant force wheel 60, and a torque adjusting mechanism 110 for adjusting the torque of the constant force spring 10 0. The first axis of rotation 01 is arranged in an offset position in the plane of the plate 23 (see Figure 4) relative to the axes of rotation of the first transmission wheel 18 and the second transmission wheel 19 (see Figure 2) which are described above.

[0052] Figure 4 is a sectional view illustrating part of the movement of the first embodiment.

As illustrated in Figure 4, the fixed wheel 31 is arranged between the plate 23 and a constant force unit bridge 24. The constant force unit bridge 24 is arranged above the plate 23. The fixed wheel 31 includes a tubular body 32 arranged coaxially with the first axis of rotation 01 and a main wheel body 33 formed integrally with the tubular body 32.

The tubular body 32 is attached to a lower surface of the constant force unit bridge 24 by a fixed wheel pin 34 projecting downward from the constant force unit bridge 24. A central hole 35 and a window 36 are formed in the tubular body 32. The central hole 35 extends vertically with a constant internal diameter with the first axis of rotation 01 for center, and vertically penetrates the tubular body 32. The window 36 is adjacent to the central hole 35 along the direction of alignment between the first axis of rotation O1 and the axis of rotation of the first transmission wheel 18 when the latter are seen from a vertical direction (see FIG. 3). The window 36 penetrates the tubular body 32 in the vertical direction and extends the central hole 35 continuously. Therefore, a hole penetrating vertically inside the fixed wheel 31 is an oblong hole when viewed from the vertical direction.

[0055] The wheel main body 33 is formed coaxially with the first rotation axis 01 and protrudes from a lower end of the tubular body 32 outward in a radial direction. Fixed teeth 33a are formed on the entire periphery of an outer peripheral surface of the wheel main body 33. In other words, the fixed wheel 31 is a gear whose teeth are formed outward.

The upper level constant force wheel 40 is pivotally mounted between the platen 23 and the constant force unit bridge 24. The upper level constant force wheel 40 includes a rotation shaft 41 rotating about the first axis of rotation 01, a planet wheel 43 pivoting around the first axis of rotation 01, and a support 47 essentially supporting the planet wheel 43.

The rotation shaft 41 extends along the first rotation axis 01. The rotation shaft 41 is supported essentially by the platen 23 and the constant force unit bridge 24 via hole stones 25A and 25B. Hole stones 25A and 25B are formed, for example, of an artificial stone such as ruby. In addition, the hole stones 25A and 25B are not limited to the case of being formed of an artificial stone, but may for example be formed of other fragile materials or metallic materials such as iron-based alloys. A constant-force upper gear 41a is formed in an upper portion of the rotation shaft 41. The constant-force upper gear 41a meshes with the first transmission wheel 18. Therefore, power is transmitted from the movement barrel 11 via the gear train located on the side of the energy source 12 (see both in FIG. 2) towards the rotation shaft 41. The energy of the torque Tb is transmitted from the barrel of the movement 11 towards the shaft of rotation 41. Hereafter, the torque Tb is referred to as the rotation torque Tb of the barrel of the movement 11. The rotation shaft 41 rotates clockwise under the impulse of the energy transmitted from the barrel of movement 11.

[0058] Here, a recess 27, which is dug from the axis of rotation of the first transmission wheel 18 in the direction of the first axis of rotation 01, is formed in at least elements selected from the unit bridge to constant force unit 24 and tubular body 32. In the described embodiment, recess 27 is formed to span both constant force unit bridge 24 and tubular body 32. Recess 27 is open in the direction of the axis of rotation of the first transmission wheel 18. A part of the upper constant-force pinion 41a is arranged inside the recess 27. Consequently, when assembling the movement 10, even in a state where the constant force unit bridge 24 and the rotation shaft 41 are arranged at predetermined positions, the first transmission wheel 18 can be kinematically connected to the upper constant force bearing pinion 41a by being inserted into the recess 27 p ar slip.

The support 47 is fixedly mounted on the rotation shaft 41, and carried by the latter. The rotational torque Tb in the clockwise direction is transmitted from the rotation shaft 41 to the support 47. Consequently, the support 47 rotates, thanks to the energy supplied by the barrel of the movement 11, with the rotation shaft 41 in a clockwise direction around the first axis of rotation 01. The support 47 comprises a lower plate set with stones 48 integrally connected to the rotation shaft 41, and an upper plate set with stones 54 arranged above the lower plate set with stones 48, and fixed to the lower plate set with stones 48.

The lower stone-set plate 48 is disposed below the fixed gear 31. The lower stone-set plate 48 includes a sun gear support portion 49, supporting the sun gear 43, a spring support portion 50, supporting the constant force spring 100, and a connecting part 51 connecting the sun gear supporting part 49 to the spring supporting part 50.

[0061] Figure 5 is a plan view of part of the movement of the first embodiment, seen from above.

As shown in Figs. 3 and 5, the sun gear support portion 49 extends in a circular arc shape along a circumferential direction around the first axis of rotation 01 when viewed. in a vertical direction. The sun gear support part 49 is formed such that an intermediate part as seen from the vertical direction is lowered one stage below both ends.

As illustrated in Figure 4, the spring support part 50 is arranged on the opposite side to the support part of the planet wheel 49, the first axis of rotation 01 being interposed between them. A pin insertion hole 50a, through which a constant force spring pin 103 described later is inserted, is formed in the spring support part 50. The link part 51 has a central hole through which the rotation shaft 41 is inserted. The connecting part 51 is fixed to the rotation shaft 41 at a part lower than that of the upper constant-force bearing gear 41a. Therefore, the lower stone plate 48 rotates integrally with the rotation shaft 41. A support window 52 is formed in the lower stone plate 48. The support window 52 is formed on the first axis side. of rotation 01 with respect to the support part of the planet wheel 49. The support window 52 penetrates vertically into the lower plate set with stones 48. The support window 52 avoids any contact with the lower plate set with stones 48 and a stone forming an engagement claw 86 (engagement claw) described later.

As shown in Figure 3, the upper stone-set plate 54 is disposed above the sun gear support portion 49 of the lower stone-set plate 48, and above the wheel main body. 33 of the fixed wheel 31. The upper stone-set plate 54 extends in a circular arc shape along a circumferential direction around the first axis of rotation 01, when the latter is viewed from a vertical direction. The upper stone-set plate 54 is stacked on top of the sun gear support portion 49 of the lower stone-set plate 48, but spaced therefrom by a plurality of flanges 55. The two ends of the upper stone-set plate Stones 54 are attached to both ends of the planet wheel support portion 49 by a plurality of bolts 56 inserted through the plurality of flanges 55.

As shown in Figure 4, sun gear 43 is rotatably mounted on bracket 47. Specifically, sun gear 43 is pivotally mounted between sun gear support portion 49 of lower stone set plate 48 and the upper stone-set plate 54, being supported via hole stones 59A and 59B, and is rotatable about a second axis of rotation O2. The second axis of rotation O2 is disposed in a position offset in the plane of the plate 23 with respect to the first axis of rotation 01 and in a fixed position with respect to the support 47. The planet wheel 43 is disposed vertically between the intermediate part of the sun gear support portion 49 of the lower stone plate 48 and the middle part of the upper stone plate 54 (see Fig. 3). The planet wheel 43 includes a planet pinion 44 and a planet gear wheel 45.

[0066] The planetary gear 44 meshes with the fixed toothing 33a of the fixed wheel 31. Since the fixed wheel 31 is a toothed wheel on its outer periphery, the planetary wheel 43 performs a revolution in the direction of clockwise around of the first axis of rotation 01 while rotating around the second axis of rotation 02 clockwise, following the rotation of the support 47 clockwise by meshing between the planet gear 44 and the fixed wheel 31.

[0067] The planetary gear wheel 45 is formed below the planetary pinion 44 and can rotate (both in rotation on itself and to perform a revolution around another axis) without being in contact with the fixed wheel 31. Planetary gear wheel 45 has a plurality of stopper teeth 45a engageable with an engagement surface 86a (see Fig. 8) of the stone forming the engagement claw 86 described more away, and freed from it. The number of stop teeth 45a is 8. However, the present invention is not limited to such a case, and the number of teeth can be changed as needed.

[0068] As illustrated in Figure 5, the stop teeth 45a are inclined clockwise around the second axis of rotation 02 and arranged around the second axis of rotation 02 when viewed according to the vertical direction. The tip of the stop tooth 45a is an active surface in the process of engagement and disengagement with respect to the engagement surface 86a of the stone constituting the engagement claw 86. The tip of the tooth stopper 45a has a curved projecting surface shape when viewed in the vertical direction. In what follows, the rotation envelope M of the planetary gear wheel 45 will be referred to as being the rotation envelope M, that is to say the circle drawn by the tip of the tooth of the tooth of stop 45a following the rotation of the planet wheel 43.

As shown in Fig. 4, the lower level constant force wheel 60 is rotatably supported by the rotating shaft 41 of the upper level constant force wheel 40 between the platen 23 and the bridge. constant force unit 24. The lower level constant force wheel 60 is disposed between the support 47 and the plate 23 below the support 47 of the upper level constant force wheel 40. The lower level constant force wheel 60 includes a lower level tube 61, fitted to the outside of the rotation shaft 41, and a lower level constant force gear wheel 62 integrally connected to the lower level tube 61. lower level constant force 60 rotates clockwise around the first axis of rotation 01 under the action of the energy transmitted by the constant force spring 100.

[0070] The rotation shaft 41 is inserted into the lower level tube 61 from above and protrudes below the lower level tube 61. Ring-shaped hole stones 69A and 69B are driven from the bottom. inside the upper and lower ends of the lower level tube 61. The rotation shaft 41 is inserted between the hole stones 69A and 69B, inside them.

The lower level constant force gear wheel 62 is integrally connected to the lower end of the lower level tube 61. Lower level teeth 62a with which the second transmission wheel 19 meshes are formed all along the outer periphery of the lower level constant force gear wheel 62. Therefore, the lower level constant force wheel 60 can transmit energy from the constant force spring 100 to the second transmission wheel 19 connected to the escapement 14, that is to say, to the cog located on the side of the escapement 15.

[0072] Further, within the framework of this embodiment, a case is described where the energy of the constant force spring 100 is transmitted to the escapement 14 via the escapement side train 15 by way of example. , but the present invention is not limited to such a case. For example, the energy of the constant force spring 100 can be directly transmitted to the escapement 14 without the cog located on the side of the escapement 15.

The engagement and disengagement lever unit 80 comprises the stone forming an engagement claw 86 which alternately engages the stopper tooth 45a of the planetary gear wheel 45 and then releases from that here, and rotatably supports the stone forming the engagement claw 86 about the first axis of rotation 01. The engagement and disengagement lever unit 80 comprises a lever cap 81 and a lever spring 94 arranged in a fixed manner in rotation with respect to the lower level tube 61, and an engagement and disengagement lever 84 arranged so as to be free in rotation with respect to the lower level tube 61.

The lever cap 81 has a cylindrical shape coaxial with the first axis of rotation 01. The lever cap 81 is fitted on the outside of the upper end of the lower level tube 61 of the constant force wheel of lower level 60, and is integrally connected with the lower level tube 61. Therefore, the lever cap 81 rotates clockwise around the first axis of rotation 01 in synchronization with the rotation of the force wheel lower level constant 60. A collar 82 protruding outward in the radial direction is formed at an upper end of the lever cap 81.

Fig. 6 is a plan view of the engagement and disengagement lever unit of the first embodiment, viewed from above. Fig. 7 is a sectional view illustrating the engagement and release lever unit of the first embodiment.

As shown in Figures 6 and 7, the engagement and release lever 84 is arranged to be rotatable about the first axis of rotation 01 relative to the lever cap 81 and the lever spring 94. The Engagement and release lever 84 includes a lever main body 85 (the lever body), the stone forming an engagement claw 86, and a lever pin 87 supported by the lever main body 85.

The lever main body 85 is disposed below the sun gear 45 of the sun gear 43 (see Fig. 4). The lever main body 85 is rotatably supported by a vertical intermediate portion of the lever cap 81. The lever main body 85 cannot move upward relative to the lower level tube 61 due to the collar 82 of the lever cap 81. The lever main body 85 includes a first lever portion 90, a second lever portion 91, and a third lever portion 92 extending radially outward from the lever cap 81. first lever part 90, the second lever part 91, and the third lever part 92 are arranged so as to be spaced from each other in a circumferential direction around the first axis of rotation 01. In the example illustrated, vertically oriented through holes are formed at the ends of the base of the first lever part 90, the second lever part 91, and the third lever part 92. However, the shapes for the first lever part 90, the second lever part 91, and the third lever part 92 are not limited to such a case, but can be changed freely. In addition, the shape of the lever main body 85 is not limited to the shape described above, but can be changed freely. For example, the main lever body may not include a third lever portion 92.

A stone holding part 90a for holding the stone forming the engagement claw 86 is formed at one end of the first lever part 90. The stone holding part 90a enters the first part vertically. lever 90. A pin holding part 91a for holding the lever pin 87 is formed at one end of the second lever part 91. The pin holding part 91a enters the second lever part vertically. 91.

Fig. 8 is a perspective view of the planet wheel and the engagement and disengagement lever unit according to the first embodiment, seen from above, while Fig. 9 is a perspective view of the planet wheel and the engagement and disengagement lever unit of the first embodiment, seen from below.

As shown in Figures 8 and 9, the stone forming the engagement claw 86 is fixed to the stone holding part 90a of the first lever part 90, and is rotatably mounted on the main lever body 85 with respect to the lever cap 81 and the lever spring 94. Consequently, the stone forming the engagement claw 86 is arranged so as to be able to oscillate around the first axis of rotation 01. The stone forming the engagement claw 86 is formed, for example, of an artificial stone such as a ruby. However, the stone forming the engagement claw 86 is not limited to the case where it consists of an artificial stone similar to the hole stone described above, but can for example be formed of other fragile materials or materials metals such as iron-based alloys. In addition, the stone forming the engagement claw 86 could not be formed separately from the main lever body 85, but could be formed integrally, that is to say in one piece, with the lever main body 85. The stone forming the engagement claw 86 is held in a state where it protrudes toward the planetary gear wheel 45 (forward) from the stone holding portion 90a. The stone forming the engagement claw 86 is disposed within the support window 52 of the support 47 of the upper level constant force wheel 40 (see Figure 4).

[0081] Figure 10 is a plan view of part of a constant torque mechanism according to the first embodiment, seen from above.

As shown in Figures 8 and 10, among the projecting parts of the stone forming the engagement claw 86, the side surface oriented on the side opposite the first axis of rotation 01 constitutes the engagement surface 86a with which the tip of the stopper tooth 45a of the planetary gear wheel 45 is engaged and from which it is alternately released. In the example illustrated, substantially all of the engagement surface 86a is a flat surface, the two ends of which are chamfered at R when viewed in the vertical direction. In other words, the edges of the engagement surface 86a on both sides in the circumferential direction around the first rotation axis θ1 project in a curved shape when seen in the vertical direction. Below, the edge of the engagement surface 86a in the counter-clockwise direction around the first axis of rotation 01 will be referred to as the first edge 86a1. The stone forming the engagement claw 86 engages the planetary gear 45 within the rotation envelope M of the planetary gear 45 to limit the rotation of the planetary gear 43. more, the stone forming the engagement claw 86 is moved clockwise around the first axis of rotation 01 with respect to the planet wheel 43 and retracts outside the envelope of rotation M of the planetary gear wheel 45 to disengage from stopper tooth 45a and release engagement with planetary gear wheel 45.

As illustrated in Figure 7, the lever pin 87 comprises a shaft 87a constituting the body of this part, which takes the form of a column extending vertically, and which is inserted through the holding part of pin 91a of the lever main body 85, and a head 87b having a larger diameter located at a lower end of the shaft 87a. Shaft 87a projects both upward and downward from second lever portion 91. Head 87b is disposed so as to be spaced from the bottom surface of second lever portion 91.

As shown in Figs. 7 and 9, the lever spring 94 is disposed below the lever main body 85 and is fixedly supported by the lower end of the lever cap 81. Therefore, the spring lever spring 94 rotates clockwise around the first axis of rotation 01, in synchronization with the rotation of the lower level constant-force wheel 60. The lever spring 94 includes a base 95 (synchronous rotating part ) attached to the lever cap 81, and a spring main body 97 (elastic member) extending from the base 95.

[0085] As shown in Figure 9, the base 95 is configured in a ring shape so as to surround the first axis of rotation 01. The base 95 is fitted on the outside of the lower end of the lever cap 81, and is integrally connected to the lever cap 81. The base 95 can abut the lever main body 85 of the engagement and disengagement lever 84 from below, and restrict the downward movement of the lever main body 85 by relative to the lever cap 81. An arm 96 is formed in the base 95.

As illustrated in Figure 6, the arm 96 extends along a direction of extension of the second lever portion 91 of the engagement and disengagement lever 84 when seen in the direction vertical. One end of arm 96 bears against shaft 87a of lever pin 87 between one end of second lever portion 91 and head 87b of lever pin 87 counterclockwise around of the first axis of rotation 01 (see also Figure 9). Accordingly, arm 96 limits the rotation of engagement and disengagement lever 84 relative to base 95 in a counter-clockwise direction about first axis of rotation 01. In other words, arm 96 limits the movement of the stone forming the engagement claw 86 into engagement with the planetary gear wheel 45 (see both in Figure 8) counterclockwise about the first axis of rotation 01 with respect to the base 95. The lever spring 94 compresses the engagement and disengagement lever 84 clockwise around the first axis of rotation 01 to rotate.

[0087] The main spring body 97 is a thin leaf spring. The main spring body 97 extends from the end of the arm 96 counterclockwise around the first axis of rotation 01. The main spring body 97 rotates around the base 95 outward in the radial direction and comes to bear against the shaft 87a of the lever pin 87 going up clockwise around the first axis of rotation 01 between the end of the second lever part 91 and the head 87b of the lever pin 87 (see also figure 9). Accordingly, the spring main body 97 allows the engagement and disengagement lever 84 to move relative to the base 95 in a clockwise direction about the first axis of rotation 01 while compressing the lever. engagement and release 84 with respect to the base 95 in the counterclockwise direction around the first axis of rotation 01. Consequently, the stone forming the engagement claw 86 included in the engagement and release lever clearance 84 is in a state where it has play with respect to the base 95 in the clockwise direction around the first axis of rotation 01.

As illustrated in Figure 10, the constant force spring 100 is a fine leaf spring made of a metal such as iron or nickel, or an alloy, and has a spiral shape. Specifically, the constant force spring 100 is configured as a spiral corresponding to the Archimedean spiral in a polar coordinate system, taking the first axis of rotation θ1 as the origin. Accordingly, the constant force spring 100 is wound with a plurality of turns such that each winding is adjacent to each other at substantially equal intervals in the radial direction, when viewing the spring as the vertical direction.

As shown in Figure 4, the constant force spring 100 is located below the engagement and disengagement lever unit 80, and is disposed between the engagement and disengagement lever unit. 80 and the lower level constant-force gear wheel 62. In the constant-force spring 100, an outer end 101, which constitutes a first peripheral end, is connected to the lower plate set with stones 48 of the support 47 of the upper level constant force wheel 40 via the constant force spring pin 103, and an inner end 102, which constitutes the other peripheral end, is connected to the lower level constant force wheel 60 via a fixing ring 104 and the torque adjustment mechanism 110. Therefore, the constant force spring 100 can transmit accumulated energy to each of the upper level constant force wheel 40 and lower level constant force wheel 60.

[0090] The constant force spring pin 103 is held in the spring support part 50 in a state where it protrudes below the pin insertion hole 50a formed in the spring support part 50 of the upper-level constant-force wheel 40. The outer end 101 of the constant-force spring 100 is fixed to a projecting part of the constant-force spring pin 103.

The fixing ring 104 is fixed to the inner end 102 of the constant-force spring 100. The fixing ring 104 is configured in annular form and coaxial with the first axis of rotation 01. The fixing ring 104 is integrally connected to a constant force spring cap 111 of the torque adjustment mechanism 110, which will be described later.

[0092] The constant force spring 100 is wound in a predetermined amount of windings in a clockwise direction toward the outer end 101 with the inner end 102 as the unwinding position. The constant force spring 100 is elastically deformed to reduce its diameter when it is raised, and a preload is then applied. Therefore, torque energy Tc is generated in the constant force spring 100 and energy is accumulated therein. The energy accumulated in the constant force spring 100 is transmitted to the upper level constant force wheel 40 and the lower level constant force wheel 60 in accordance with the elastic restoring force due to the elastic deformation of the force spring. constant force 100. Therefore, the upper-level constant-force wheel 40 and the lower-level constant-force wheel 60 can rotate around the first axis of rotation 01 in opposite directions to each other under the impetus energy transmitted by the constant force spring 100. Specifically, the lower level constant force wheel 60 can rotate clockwise and the upper level constant force wheel 40 can rotate clockwise. counter clockwise. Hereinafter, reference is made to the torque Tc to designate the rotational torque Tc of the constant-force spring 100. In addition, in a case where the mainspring 16 of the movement barrel 11 is wound with a predetermined amount of windings, the rotation torque Tc is a torque smaller than the rotation torque Tb of the rotation shaft 41.

The torque adjustment mechanism 110 applies a preload to the constant force spring 100 to adjust the rotational torque Tc of the constant force spring 100. The torque adjustment mechanism 110 includes the constant force spring cap 111 supported by the lower level tube 61 of the lower level constant force wheel 60, a first torque adjustment wheel 112 integrally connected to the constant force spring cap 111, a second torque adjustment wheel 113 connected integrally to the lower level tube 61, and a torque adjustment jumper 114 which engages with the first torque adjustment wheel 112 and the second torque adjustment wheel 113.

[0094] The constant force spring cap 111 is arranged in a cylindrical shape coaxial with the first axis of rotation 01. The constant force spring cap 111 is fitted on the outside of the lower level tube 61 between the wheel of lower level constant force gear 62 and the engagement and disengagement lever unit 80. The constant force spring cap 111 is rotatably arranged with respect to the lower level tube 61 about the first axis of rotation 01. The fixing ring 104 is fitted to the outside of an intermediate part, in the vertical direction, of the constant-force spring cap 111, and the constant-force spring cap 111 and the fixing ring 104 are integrally connected to each other.

[0095] The first torque adjusting wheel 112 is integrally connected to a lower end of the constant force spring cap 111. First torque adjusting teeth 112a are formed on the entire outer peripheral surface of the first torque adjusting wheel. torque adjuster 112. A torque adjuster wheel (not shown) meshes with the first torque adjuster teeth 112a.

The second torque adjusting wheel 113 is disposed between the lower level constant force gear wheel 62, the constant force spring cap 111, and the first torque adjusting wheel 112. The second torque adjustment wheel 113 is integrally connected to the lower level tube 61. The second torque adjustment wheel 113 is formed with a diameter smaller than that of the first torque adjustment wheel 112. Second teeth d torque adjusters 113a are formed on an entire outer peripheral surface of the second torque adjuster wheel 113. The torque adjuster jumper 114 reversibly and intermittently engages with the second torque adjuster teeth 113a.

The torque adjustment jumper 114 is supported by the first torque adjustment wheel 112, and can perform a revolution around the first axis of rotation 01 at the periphery of the second torque adjustment wheel 113. The torque adjustment jumper 114 may limit the rotation of the first torque adjustment wheel 112 clockwise relative to the second torque adjustment wheel 113. In addition, the torque adjustment jumper torque adjuster 114 may allow rotation of the first torque adjuster wheel 112 counterclockwise relative to the second torque adjuster wheel 113.

[0098] Therefore, when the constant force spring cap 111 and the first torque adjustment wheel 112 receive energy from the constant force spring 100 in the clockwise direction, the energy is transmitted to the second torque adjusting wheel 113 via the torque adjusting jumper 114. Next, the torque adjusting jumper 114 limits the rotation of the first torque adjusting wheel 112 in the clockwise direction. clockwise with respect to the second torque adjustment wheel 113, and the first torque adjustment wheel 112 and the second torque adjustment wheel 113 rotate together clockwise. Therefore, the lower level constant force wheel 60 also rotates clockwise with the second torque adjustment wheel 113.

[0099] Further, when the preload is applied to the constant force spring 100, the torque adjusting wheel (not shown) meshes with the first torque adjusting wheel 112, and the torque adjusting wheel is rotated to rotate the first torque adjustment wheel 112 counterclockwise. Next, the torque adjustment jumper 114 allows the rotation of the first torque adjustment wheel 112 counterclockwise with respect to the second torque adjustment wheel 113, such that the constant-force spring cap 111 and the fixing ring 104 are rotated counterclockwise without rotating the lower-level constant-force wheel 60. Therefore, the inner end 102 of the constant force spring 100 can be rotated counterclockwise. As a result, the constant force spring 100 can be raised and the preload of the constant force spring 100 increased accordingly, so that the rotational torque Tc can be adjusted to increase.

(Operation of the constant torque mechanism)

In the following, an operation of the constant torque mechanism 30 having the configuration described above will be described.

Furthermore, in an initial state, the mainspring 16 of the barrel of the movement 11 is wound by being wound on itself with a predetermined quantity of windings, and the energy of the torque Tb is transmitted from the barrel of movement 11 to the support 47 of the upper level constant-force wheel 40 via the cog located on the side of the energy source 12. In addition, the constant-force spring 100 is wound with a predetermined amount of windings, and the energy of the rotational torque Tc less than the rotational torque Tb is transmitted from the constant force spring 100 to the support 47 of the upper level constant force wheel 40 and the lower level constant force wheel 60.

[0102] According to the constant-torque mechanism 30 of the described embodiment, since the constant-force spring 100 is supplied, the energy accumulated in the constant-force spring 100 is transmitted to the lower-level constant-force wheel 60, and the lower-level constant-force wheel 60 can be rotated clockwise about the first axis of rotation 01. In detail, the energy of the constant-force spring 100 is transmitted to the mechanism of torque adjustment 110 via the attachment ring 104. The energy transmitted to the torque adjustment mechanism 110 is transmitted to the lower level constant-force wheel 60. Therefore, the energy is transmitted from the constant-force spring 100 to the lower level constant force wheel 60 so as to rotate clockwise around the first rotation axis 01 by using the rotation torque Tc. Further, the energy of the constant force spring 100 can be transmitted from the lower level constant force wheel 60 to the second transmission wheel 19, and the second transmission wheel 19 can be rotated in accordance with that of the lower-level constant-force wheel 60. That is, the energy of the constant-force spring 100 can be transmitted to the escapement-side cog 15 via the lower-level constant-force wheel 60, and operate the escapement 14.

[0103] In addition, since the energy of the constant-force spring 100 can also be transmitted to the upper-level constant-force wheel 40, the upper-level constant-force wheel 40 is rotated counterclockwise. of a watch around the first axis of rotation O1 by the torque Tc.

[0104] However, the rotational torque Tb is transmitted from the cog located on the side of the energy source 12 to the upper level constant-force wheel 40 to cause it to rotate clockwise around the first axis of rotation 01. Since the rotational torque Tb is larger than the rotational torque Tc, the upper-level constant-force wheel 40 is prevented from rotating counterclockwise around the first axis of rotation 01.

[0105] In addition, an energy (rotation torque Tb - rotation torque Tc) corresponding to a difference between the rotation torque Tb transmitted from the gear train located on the side of the energy source 12 and the rotation torque Tc transmitted since the constant force spring 100 acts on the upper level constant force wheel 40. On the other hand, the stone forming the engagement claw 86 of the engagement and disengagement lever unit 80 engages with the planetary gear wheel 45 in the rotation envelope M of the planetary gear wheel 45 of the upper level constant-force wheel 40, so that the rotation on itself and the revolution of the wheel planetary 43 are limited. Therefore, the upper level constant force wheel 40 and the lower level constant force wheel 60 can be interlocked, and the upper level constant force wheel 40 can be prevented from rotating clockwise. around the first axis of rotation O1.

[0106] As described above, at a stage when the planetary gear wheel 45 and the engagement claw stone 86 are brought into mutual engagement, the upper level constant force wheel 40 is restrained from rotating around. of the first axis of rotation 01. In addition, since the energy corresponding to the difference described above acts on the upper-level constant-force wheel 40, a tip of the stopper tooth 45a of the planetary gear wheel 45 engages the engagement surface 86a of the stone forming the engagement claw 86 to be in a highly compressed state.

[0107] Figs. 11 to 14 are explanatory views of the operation of the constant torque mechanism according to the first embodiment, and plan views of the fixed gear, the sun gear, and the engagement lever unit and of clearance when viewed from above. Additionally, in Figs. 11 to 14, the fixed gear, the sun gear, and the engagement and disengagement lever unit are schematically illustrated.

[0108] When the lower-level constant-force wheel 60 rotates using the energy of the constant-force spring 100, the lever stopper 81 and the lever spring 94 of the engagement lever unit and release lever 80 accordingly rotate clockwise around the first rotation axis 01. When the lever spring 94 rotates, the engagement and release lever 84 of the engagement lever unit and release lever 80 is compressed by arm 96 of lever spring 94, and rotates clockwise about first axis of rotation 01. When engagement and release lever 84 rotates clockwise of a watch, the stone forming the engagement claw 86 arranged on the engagement and disengagement lever 84 moves clockwise around the first axis of rotation 01, in a state where it has still some play to move clockwise in the turn of the first axis of rotation θ1. Therefore, the engagement and disengagement lever unit 80 can be gradually released from the planetary gear wheel 45, so that the stone forming the engagement claw 86 retracts outside the envelope of rotation M of the planetary gear wheel 45. Therefore, as shown in Figures 11 to 13, the tip of the stopper tooth 45a moves counterclockwise a watch around the first axis of rotation 01 with respect to the engagement surface 86a, while sliding on the engagement surface 86a in accordance with the release movement of the stone forming the engagement claw 86.

[0109] Here, the force F applied between the stopper tooth 45a and the stone forming the engagement claw 86 is a force resulting from a compression force with which the stopper tooth 45a bears on the surface of engagement 86a, and a frictional force generated by a sliding movement of the stop tooth 45a on the engagement surface 86a. The compressive force is a force acting parallel to a normal direction at the contact portion between the stopper tooth 45a and the engagement surface 86a; the frictional force is a force acting parallel to a tangential direction at the contact portion between the stopper tooth 45a and the engagement surface 86a. The tip of the stopper tooth 45a and the first edge 86a1 of the engagement surface 86a have a curved projecting surface shape when viewed from the vertical direction, so that when the tip of the stop tooth 45a comes into contact with the first edge 86a1 of the engagement surface 86a, the force F approaches clockwise around the first axis of rotation 01 (see figure 13). Therefore, the engagement and disengagement lever 84 including the stone forming the engagement claw 86 rotates clockwise about the first axis of rotation 01 with respect to the base 95 against the pushing force of the spring main body 97 of the lever spring 94. As shown in Fig. 14, when the tip of the stopper tooth 45a passes the first edge 86a1 of the engagement surface 86a, the engagement between the stopper tooth stop 45a and the stone forming an engagement claw 86 is released. Therefore, the engagement between the upper level constant force wheel 40 and the lower level constant force wheel 60 via the stone forming the engagement claw 86 and the planet wheel 43 is released.

[0110] Therefore, the upper level constant force wheel 40 rotates clockwise around the first axis of rotation 01 with the energy (rotation torque Tb - rotation torque Tc), c' is to say the difference between the torque Tb transmitted from the gear train located on the side of the energy source 12 and the torque Tc transmitted from the constant-force spring 100.

[0111] The upper-level constant-force wheel 40 rotates clockwise about the first axis of rotation 01, so that the constant-force spring 100 can be wound up via the force spring pin. constant force 103 fixed to the support 47, and energy can be stored in the constant force spring 100. In other words, it is possible to compensate for a loss of energy lost during the transmission of energy to the force wheel. lower level constant 60 using the energy transmitted from the movement barrel 11 used as an energy source. Therefore, the energy of the constant force spring 100 can be constantly maintained and the escapement 14 can be operated with a constant torque.

[0112] Further, even in a case where the energy supply to the constant-force spring 100 is performed, the lower-level constant-force wheel 60 rotates with the energy of the constant-force spring 100, and the energy of the constant force spring 100 is transmitted to the gear train located on the side of the escapement 15.

[0113] Further, when power supply to the constant-force spring 100 is performed, the sun gear 43 performs a clockwise revolution around the first rotation axis 01 while rotating on itself clockwise around the second axis of rotation O2 in accordance with the rotation of the upper level constant force wheel 40 around the first axis of rotation 01 to follow the stone forming the engagement claw 86. The planet wheel 43 rotates a total corresponding to one tooth of the stopper tooth 45a to catch up with the stone forming the engagement claw 86, and the tip of the stopper tooth 45a engages again with the engagement surface 86a of the stone forming the engagement claw 86.

[0114] Therefore, since the upper level constant-force wheel 40 and the lower level constant-force wheel 60 engage again, any rotation of the upper level constant-force wheel 40 is prevented, and the energy supply to the constant force spring 100 is completed.

The engagement and disengagement between the planetary gear wheel 45 and the stone forming the engagement claw 86 can be effected intermittently by repeating the operation described above. That is, the engagement and disengagement between the planetary gear wheel 45 and the engagement claw stone 86 is effected intermittently, and the upper-level constant-force wheel 40 can be rotated intermittently by relative to the lower-level constant-force wheel 60 based on the rotation of the lower-level constant-force wheel 60. Therefore, power supply to the constant-force spring 100 can be performed intermittently.

As described above, the constant torque mechanism 30 of the embodiment includes the base 95 of the lever spring 94 rotating clockwise about the first axis of rotation 01 in synchronization with the rotation of the lower level constant-force wheel 60, and the stone forming the engagement claw 86 rotating clockwise around the first axis of rotation 01 in accordance with the rotation of the base 95, capable of engage and release from the planetary gear wheel 45, by engaging the planetary gear wheel 45 in the rotation envelope M of the planetary gear wheel 45 to restrict the rotation of the planetary gear wheel 45, and then being moved relative to the base 95 so as to be able to retract outside the rotation envelope M of the planetary gear wheel 45. In such a configuration, the stone forming the commitment claw 86 is moved relative to the base 95 and withdraws outside the rotation envelope M of the planetary gear wheel 45, such that immediately before the clearance between the planetary gear wheel 45 and the stone forming the engagement claw 86, it is possible to reduce the clockwise torque around the first axis of rotation 01 which is transmitted from the planetary gear wheel 45 to the base 95 via the stone forming the engagement claw 86. Therefore, it is possible to suppress the fluctuation of the torque transmitted from the base 95 to the escapement 14 via the lower level constant-force wheel 60. Therefore, it is possible to suppress the fluctuation of the torque transmitted to the exhaust 14.

More particularly, in the embodiment described, the tip of the stopper tooth 45a of the planetary gear wheel 45 and the first edge 86a1 of the engagement surface 86a of the stone forming the claw engagement 86 have a curved projecting surface shape when viewed from the vertical direction. Therefore, it is possible to reduce the pressure at the contact surface between the planet gear wheel 45 and the stone forming the engagement claw 86, and prevent severe abrasion from occurring between the planetary gear wheel 45 and the stone forming an engagement claw 86 compared to the case where the tip of the planetary gear wheel stopper tooth and the first edge of the engagement surface of the stone forming an engagement claw do not have a curved projecting surface shape. Also, in this case, the sliding distance between a tooth tip of the stopper tooth 45a of the planetary gear wheel 45 and the first edge 86a1 of the engagement surface 86a of the stone forming a claw d engagement 86 is increased compared to the case where the tooth tip of the stopper tooth of the planetary gear wheel and the first edge of the engagement surface of the stone forming an engagement claw do not have a shape of surface projecting in a curved way. Therefore, the period during which the direction of the force F applied between the planetary gear 45 and the engagement claw stone 86 approaches clockwise around the first axis of rotation θ1 is increased. Here, in the embodiment described above, immediately prior to disengagement between the planetary gear wheel 45 and the engagement claw stone 86, the engagement claw stone 86 is retracted apart. of the rotational envelope M of the planetary gear wheel 45, and the clockwise torque around the first axis of rotation 01, which is transmitted from the planetary gear wheel 45 to the base 95, can be reduced. Therefore, it is possible to improve the durability of the constant torque mechanism 30 and to suppress the torque fluctuation.

[0118] Furthermore, since the abrasion between the planetary gear wheel 45 and the stone forming the engagement claw 86 is eliminated, there is room to increase the force applied at the contact portion between the planetary gear wheel 45 and the stone forming the engagement claw 86. Therefore, the distance between the contact portion between the planetary gear wheel 45 and the stone forming the engagement claw 86, and the first axis of rotation θ1 can be reduced, and the constant torque mechanism 30 can be reduced in size.

[0119] In addition, the stone forming the engagement claw 86 moves clockwise around the first axis of rotation 01 with respect to the base 95, and withdraws outside the envelope of rotation M. In this configuration, immediately before the clearance between the planet gear 45 and the stone forming the engagement claw 86, when the direction of the force F applied between the planet gear 45 and the stone forming the engagement claw 86 approaches clockwise around the first axis of rotation 01, the engagement claw stone 86 is compressed by the planetary gear wheel 45 and the engagement claw stone engagement 86 can be moved relative to base 95. Therefore, clockwise torque about first axis of rotation 01, which is transmitted from planetary gear 45 to base 95 via the stone forming a claw of en engagement 86, is reduced by the displacement of the stone forming the engagement claw 86. Therefore, the fluctuation of the torque transmitted from the base 95 to the escapement 14 via the lower level constant force wheel 60 can be suppressed.

[0120] In addition, the constant torque mechanism 30 further comprises the spring main body 97 indirectly prompting the stone forming an engagement claw 86 to move inwardly of the rotation envelope M via the main body lever 85. In such a configuration, it is possible to prevent the stone forming an engagement claw 86 from remaining in a state where it is in a retracted position outside the rotation envelope M of the wheel gear 45. Therefore, the engagement and disengagement operation of the stone forming the engagement claw 86 with respect to the planet gear wheel 45 can be stabilized.

In addition, the constant torque mechanism 30 also comprises the main lever body 85 on which is mounted the stone forming the engagement claw 86 movable in rotation relative to the base 95 of the lever spring 94, and which is provided separately from the spring main body 97. According to this configuration, it is possible to stably support the stone forming the engagement claw 86 compared to the case where the stone forming the engagement claw 86 is supported by the part elastic formed by the spring. Therefore, it is possible to stabilize the movement of the stone forming the engagement claw 86 with respect to the base 95, and to stabilize the engagement and disengagement operation of the stone forming the engagement claw 86 by relative to planetary gear wheel 45.

[0122] Further, the base 95 of the lever spring 94 includes the arm 96 restricting movement of the stone forming the engagement claw 86 into engagement with the planetary gear wheel 45 in a counterclockwise direction. shows around the first axis of rotation 01 with respect to the base 95. According to this configuration, when the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 with the base 95 , the stone forming the engagement claw 86 can move counterclockwise around the first axis of rotation 01 with respect to the base 95, but in such a way that it is possible to prevent the engagement claw stone 86 can never again be released from the planetary gear wheel 45. Therefore, it is possible to stabilize the engagement and release operation of the engagement claw stone 86 relative to the gear wheel planetary stroke 45.

[0123] In addition, the stone forming the engagement claw 86 is arranged so as to be able to oscillate around the first axis of rotation 01 relative to the base 95 of the lever spring 94. In this configuration, the lever cap 81 extending along the first axis of rotation 01 and supporting the base 95 can be used as a shaft which movably supports the lever main body 85 to which the engagement claw stone 86 is fixed with respect to the base 95 of the lever spring 94. On the other hand, in a case where the stone forming an engagement claw is arranged so as to be able to oscillate around an axis different from the first axis of rotation 01, it is necessary to provide separately a member constituting the shaft (for example, in the form of a rotary lever shaft 389 as in the fourth embodiment shown in Fig. 19) arranged on an axis different from the first axis of rotation 01 as a supporting shaft in an oscillating way element to which the stone forming the engagement claw is fixed. Consequently, it is possible to reduce the number of components compared to the case where the stone forming the engagement claw 86 is arranged so as to be able to oscillate around an axis different from the first axis of rotation 01.

In the following, the assembly of the constant torque mechanism 30 will be briefly described. When the constant torque mechanism 30 is assembled, first, the lower level constant force wheel 60 is assembled to the platen. 23 with the torque adjustment mechanism 110, the constant force spring 100, and the engagement and disengagement lever unit 80. Next, the upper level constant force wheel 40 is assembled to the lower force tube. constant force wheel 61 of the lower level constant force wheel 60. Next, the fixed wheel 31, assembled with the constant force unit bridge 24, is assembled with the upper level constant force wheel 40. In this case, while the rotation shaft 41 is inserted into the central hole 35 of the fixed gear 31, the wheel main body 33 of the fixed gear 31 is connected with the planetary gear wheel 45 of the planetary gear 43 while avoiding the plate upper set with stones 54 of the support 47. Therefore, it is necessary to insert the rotation shaft 41 into the central hole 35 of the fixed wheel 31 in a state where the fixed wheel 31 is inclined with respect to the first axis of rotation 01. According to the described embodiment, the window 36 continuously extends the central hole 35 of the fixed wheel 31 through which the rotation shaft 41 is inserted, and the central hole 35 is formed as an oblong hole when the latter is seen from the vertical direction. Therefore, the rotation shaft 41 can be inserted into the central hole 35 of the fixed wheel 31 in a state where the fixed wheel 31 is inclined with respect to the first rotation axis 01. Therefore, it is possible to provide a constant torque mechanism 30 whose assembly convenience is improved.

In the timepiece 1 and the movement 10 of this embodiment, the fluctuation of the torque transmitted to the escapement 14 is suppressed and a constant torque mechanism 30 of greater durability is provided, so that It is possible to provide a movement 10 and a timepiece 1 of high precision and excellent durability.

[Second Embodiment]

[0126] In the following, a second embodiment will be described with reference to FIGS. 15 and 16. The second embodiment differs from the first embodiment in that an engagement and disengagement lever 84 is not more pushed. The configurations of other parts than those described below are the same as those of the first embodiment.

(Engagement and disengagement lever unit configuration)

Fig. 15 is a plan view of a planet wheel and an engagement and disengagement lever unit of the second embodiment viewed from above. In addition, in Fig. 15, the planet wheel, and the engagement and disengagement lever unit are illustrated in a simplified manner (which also applies to each following drawing).

As shown in Fig. 15, the engagement and disengagement lever unit 180 includes a degree adjustment lever 194 (synchronous rotating part) instead of the lever spring 94 according to the first embodiment.

[0129] The degree adjustment lever 194 is disposed below a lever main body 85 and is integrally connected to a lower end of a lever cap 81. Therefore, the degree adjustment lever 194 rotates clockwise about a first axis of rotation 01 in synchronization with the rotation of a lower level constant force wheel 60. A two-legged fork 195 is formed at one end of the degree adjustment lever 194. A lever pin 87 is disposed inside the fork 195. The inside of the fork 195 is formed to be wider than the lever pin 87 in the circumferential direction around the first axis of rotation 01. Therefore, the fork 195 allows the engagement and disengagement lever 84 including the lever pin 87 to rotate through a predetermined angle range with respect to the degree adjustment lever 194.

[0130] The fork 195 rotates clockwise around the first axis of rotation 01 so as to be in contact with the lever pin 87 counterclockwise around the first axis of rotation. rotation 01. Consequently, the degree adjustment lever 194 comes to bear against the engagement and disengagement lever 84 so as to make it rotate clockwise around the first axis of rotation 01. Furthermore, the fork 195 restricts the rotation of the engagement and disengagement lever 84 with respect to the degree adjustment lever 194 counterclockwise about the first axis of rotation θ1. In other words, the fork 195 restricts movement of the stone forming the engagement claw 86 into engagement with the planetary gear wheel 45 counterclockwise about the first axis of rotation 01 relative to the degree adjustment lever 194. As described above, the stone forming the engagement claw 86 included in the engagement and release lever 84 is in a state where it still has play to move clockwise around the first axis of rotation 01 relative to the degree adjustment lever 194.

[0131] In addition, the fork 195 restricts the rotation of the engagement and disengagement lever 84 with respect to the degree adjustment lever 194 in the clockwise direction around the first axis of rotation 01. In other words, the fork 195 restricts the movement of the stone forming the engagement claw 86 when the latter tends to withdraw outside the rotational envelope M of the planetary gear wheel 45 in the clockwise direction around of the first axis of rotation 01 with respect to the degree adjusting lever 194.

(Operation of the engagement and disengagement lever unit)

[0132] Described herein is the operation of the engagement and disengagement lever unit 180 having the configuration described above.

[0133] Similar to the first embodiment, when the planetary gear wheel 45 and the stone forming the engagement claw 86 engage with each other, a tip of a tooth of stopper 45a of the planetary gear wheel 45 engages with an engagement surface 86a of the stone forming the engagement claw 86 to come into a state of strong mutual compression.

[0134] When the lower-level constant-force wheel 60 rotates under the impulse of the energy of the constant-force spring 100, the lever cap 81 and the degree adjustment lever 194 of the lever unit engagement and release 180 accordingly rotate clockwise around the first axis of rotation 01. When the degree adjustment lever 194 rotates, the stone forming the engagement claw 86 included in the engagement and disengagement 84 moves clockwise around the first axis of rotation 01 in a state where it still has play to move clockwise around the first axis of rotation 01. Therefore, the engagement and disengagement lever unit 180 can be gradually released from the planetary gear wheel 45, so that the engagement claw stone 86 withdraws out of the rotation envelope M of the gear wheel planetary renage 45. The tip of the stop tooth 45a moves counterclockwise relative to the engagement surface 86a while sliding on the engagement surface 86a.

[0135] Fig. 16 is an explanatory view of the operation of a constant torque mechanism according to the second embodiment and a plan view of the planet wheel and the engagement and disengagement lever unit, seen from the top.

When the tip of the stopper tooth 45a comes into contact with the first edge 86a1 of the engagement surface 86a, a force F applied between the stopper tooth 45a and the stone forming the engagement claw 86 approaches clockwise around the first axis of rotation 01. Consequently, the engagement and disengagement lever 84 moves clockwise around the first axis of rotation 01 with respect to to the degree adjustment lever 194 with a play directed clockwise around the first axis of rotation 01. As shown in Fig. 16, when the tip of the stop tooth 45a passes the first edge 86a1 of the engagement surface 86a, the engagement between the stop tooth 45a and the stone forming the engagement claw 86 is released.

[0137] As described above, the constant torque mechanism 130 of the presently described embodiment includes the degree adjustment lever 194 rotating clockwise around the first axis of rotation 01 in synchronization with the rotation of the lower level constant force wheel 60 in place of the lever spring 94 of the first embodiment. Further, the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 in accordance with the rotation of the degree adjusting lever 194; it is capable of engaging and releasing the planetary gear wheel 45, engages with the planetary gear wheel 45 within the rotation envelope M of the planetary gear wheel 45 to restrict the rotation of the planetary gear wheel 45, and is then moved relative to the degree adjustment lever 194 to be able to withdraw outside the rotational envelope M of the planetary gear wheel 45. Therefore , similar to the first embodiment, the fluctuation of the torque transmitted from the degree adjusting lever 194 to the escapement 14 via the lower level constant force wheel 60 can be suppressed. Consequently, any fluctuation in the torque transmitted to the exhaust 14 can be suppressed.

[0138] In addition, the degree adjustment lever 194 includes the fork 195 restricting movement of the stone forming the engagement claw 86 into engagement with the planetary gear wheel 45 counterclockwise. around the first axis of rotation 01 with respect to the degree adjustment lever 194. In this configuration, when the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 with the degree adjustment lever 194, the stone forming the engagement claw 86 can move counterclockwise about the first axis of rotation 01 with respect to the degree adjustment lever 194, but in such a way that it is possible to prevent the stone forming the engagement claw 86 from ever again being able to be released from the planetary gear wheel 45. Therefore, it is possible to stabilize the engagement and disengagement operation of I a stone forming the engagement claw 86 with respect to the planetary gear wheel 45.

[0139] In addition, the degree adjustment lever 194 includes the fork 195 restricting the movement of the stone forming the engagement claw 86 when it withdraws outside the rotation envelope M of the gear wheel sun gear 45 clockwise around the first axis of rotation 01 relative to the degree adjustment lever 194. In this configuration, when the stone forming the engagement claw 86 withdraws outside the casing of rotation M of the planetary gear wheel 45, the stone forming the engagement claw 86 can move clockwise around the first axis of rotation 01 with respect to the degree adjustment lever 194, but in such a way that the stone forming the engagement claw 86 can again penetrate inside the rotation envelope M of the planetary gear wheel 45 and find itself in the engagement position. Therefore, it is possible to stabilize the engagement and disengagement operation of the stone forming an engagement claw 86 with respect to the planetary gear wheel 45.

[Third Embodiment]

[0140] In the following, a third embodiment will be described with reference to Figures 17 and 18. In the first embodiment, the stone forming the engagement claw 86 is indirectly prompted to move by the main body of spring 97 of the lever spring 94 via the main lever body 85. The third embodiment differs from the first embodiment in that the stone forming the engagement claw 86 is directly actuated by a spring 294. The configuration elements other than those described below are the same as those of the first embodiment.

(Engagement and disengagement lever unit configuration)

Fig. 17 is a plan view of a planet wheel and an engagement and disengagement lever unit according to the third embodiment, seen from above.

As shown in Fig. 17, the engagement and release lever unit 280 includes a base 284 (synchronous rotating part) and the spring 294 in place of the engagement and release lever 84 and the spring lever 94 of the first embodiment.

[0143] The base 284 is configured in a ring shape to surround the first axis of rotation 01. The base 284 is fitted on the outside of a lever cap 81 and is integrally connected to the lever cap 81. Therefore, the base 284 rotates clockwise about the first axis of rotation 01 in synchronization with the rotation of the lower level constant force wheel 60. An edge 284a of the base 284 facing one side of the stone forming the engagement claw 86 extends along the circumferential direction around the first rotation axis θ1 when viewed from the vertical direction. The base 284 includes a projecting portion 284b projecting from the edge 284a outward in the radial direction. The projecting portion 284b is adjacent to the edge 284a in a clockwise direction around the first axis of rotation 01. The engagement and disengagement lever unit 280 does not include the lever cap 81, and the base 284 can be directly connected to the lower level tube 61 of the lower level constant force wheel 60.

The spring 294 (elastic element) is a thin leaf spring. The spring 294 extends from one end of the base 284 towards the stone forming an engagement claw 86 counterclockwise around the first axis of rotation 01. The spring 294 rotates around the base 284 outward in the radial direction and extends around the base 284 substantially around a position facing the edge 284a of the base 284 from the outside in the radial direction. Engagement prong stone 86 is attached to one end 294a of spring 294. Accordingly, spring 294 supports engagement prong stone 86 movably relative to base 284. 86 projects from end 294a of spring 294 toward planet gear 45 (upward). The end 294a of the spring 294 bears against the edge 284a of the base 284. Consequently, the end 294a of the spring 294 is in sliding contact with the edge 284a of the base 284, and can thus move in the direction circumferential around the first axis of rotation O1.

[0145] The end 294a of the spring 294 is arranged with a space with respect to the protruding portion 284b of the base 284 in the counterclockwise direction around the first axis of rotation 01. In addition, part of the spring 294 at the base of the end 294a bears against the protruding portion 284b of the base 284 clockwise around the first axis of rotation θ1. Consequently, the end 294a of the spring 294 can rotate within a predetermined angle range relative to base 284.

[0146] The base 284 rotates clockwise around the first axis of rotation 01, such that the spring 294 is compressed by the protruding portion 284b of the base 284 and rotates clockwise. a clock around the first axis of rotation 01. In addition, the movement of the end 294a of the spring 294 counterclockwise around the first axis of rotation 01 with respect to the base 284 is limited. In other words, the protruding portion 284b of the base 284 restricts the movement of the stone forming the engagement claw 86 in engagement with the planet gear wheel 45 in the counterclockwise direction around the first axis of rotation. 01 compared to base 284.

[0147] In addition, the spring 294 allows the movement of the stone forming the engagement claw 86 relative to the base 284 in the clockwise direction around the first axis of rotation 01 while acting on the stone. forming the engagement claw 86 by causing it to move counter-clockwise around the first axis of rotation 01 with respect to the base 284. In other words, the stone forming the claw of engagement 86 attached to end 294a of spring 294 is in a state where it has play to move clockwise about first axis of rotation 01 relative to base 284. Rotation of the spring 294 in the clockwise direction around the first axis of rotation O1 with respect to the base 284 is limited by the projecting portion 284b. In other words, the protruding portion 284b of the base 284 restricts the displacement of the stone forming the engagement claw 86 in the direction of the withdrawal outside the rotation envelope M of the planetary gear wheel 45 in the direction of clockwise around the first axis of rotation 01 with respect to the base 284.

(Operation of the engagement and disengagement lever unit)

[0148] In the following, an operation of the engagement and disengagement lever unit 280 having the configuration described above will be described.

[0149] Similar to the first embodiment, when the planetary gear wheel 45 and the stone forming the engagement claw 86 are brought into mutual engagement, a point of a stopper tooth 45a of the gear wheel The planetary gear 45 comes into engagement with an engagement surface 86a of the stone forming the engagement claw 86 to find itself in a state of strong mutual compression.

[0150] As the lower level constant force wheel 60 rotates under the impetus of the energy of the constant force spring 100, the lever cap 81 and base 284 rotate clockwise accordingly. around the first axis of rotation 01. When the base 284 rotates, the stone forming the engagement claw 86, supported by the spring 294, moves clockwise around the first axis of rotation 01 in a state that it still has play to move clockwise around the first axis of rotation 01. Therefore, the engagement and disengagement lever unit 280 can be released from the wheel gradually. planetary gear 45, so that the stone forming the engagement claw 86 can withdraw outside the rotation envelope M of the planetary gear wheel 45. The tip of the stopper tooth 45a moves anti-clockwise pa r relative to the engagement surface 86a while sliding on the engagement surface 86a.

[0151] Fig. 18 is an explanatory view of the operation of a constant torque mechanism according to the third embodiment and consists of a plan view of a sun wheel and an engagement and disengagement lever unit , seen from above.

[0152] When the tip of the stopper tooth 45a comes into contact with the first edge 86a1 of the engagement surface 86a, a force F applied between the stopper tooth 45a and the stone forming an engagement claw 86 approaches clockwise around the first axis of rotation 01. Consequently, the stone forming the engagement claw 86 moves clockwise around the first axis of rotation 01 with respect to at the base 284 with a clearance directed clockwise around the first axis of rotation 01. As illustrated in Figure 18, when the tip of the stopper tooth 45a passes the first edge of engagement 86a, the engagement between the stop tooth 45a and the stone forming an engagement claw 86 is released.

As described above, the constant torque mechanism 230 of the embodiment includes the base 284 of the engagement and disengagement lever unit 280 rotating clockwise about the first axis. of rotation 01 in synchronization with the rotation of the lower level constant force wheel 60 in place of the base 95 of the lever spring 94 according to the first embodiment. In addition, the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 in accordance with the rotation of the base 284; it is capable of engaging and releasing the planetary gear wheel 45, and engages the planetary gear wheel 45 within the rotation envelope M of the gear wheel planet gear 45 to restrict the rotation of the planet gear wheel 45, and is then moved relative to the base 284 so as to be able to withdraw outside the rotational envelope M of the planet gear wheel 45 Therefore, similar to the first embodiment, the fluctuation of the torque transmitted from the base 284 to the escapement 14 via the lower level constant force wheel 60 can be suppressed. Thus, any fluctuation in the torque transmitted to the exhaust 14 can be eliminated.

[0154] Moreover, the constant torque mechanism 30 further comprises the spring 294 acting directly on the stone forming the engagement claw 86 to induce it to move towards the inside of the rotation envelope M of the planetary gear wheel 45. According to this configuration, it is possible to prevent the stone forming the engagement claw 86 from being held in a state where it is withdrawn outside the rotation envelope M of the gear wheel. planetary gear 45. Therefore, the engagement and disengagement operation of the stone forming the engagement claw 86 with respect to the planetary gear wheel 45 can be stabilized.

In addition, the stone forming the engagement claw 86 is supported by the spring 294. According to this configuration, it is possible to reduce the number of components compared to a configuration in which the stone forming the engagement claw 86 is not supported by the spring.

[0156] Additionally, the base 284 of the engagement and disengagement lever unit 280 includes the projecting portion 284b limiting the movement of the stone forming the engagement claw 86 into engagement with the planetary gear wheel 45 counterclockwise around the first axis of rotation O1 with respect to the base 284. According to this configuration, when the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 with the base 284, the stone forming the engagement claw 86 can move counterclockwise around the first axis of rotation 01 with respect to the base 284, but in such a way that it is possible to prevent the stone forming the engagement claw 86 from ever again being able to be released from the planetary gear wheel 45. Therefore, it is possible to stabilize the engagement and disengagement operation of the stone forming a engagement claw 86 relative to planetary gear wheel 45.

[0157] In addition, the base 284 of the engagement and disengagement lever unit 280 includes the protruding portion 284b limiting the movement of the stone forming the engagement claw 86 when it withdraws outside the envelope of rotation M of the planetary gear wheel 45 in the clockwise direction around the first axis of rotation O1 with respect to the base 284. According to this configuration, when the stone forming the engagement claw 86 retracts outside the rotation envelope M of the planetary gear wheel 45, the stone forming the engagement claw 86 can move clockwise around the first axis of rotation 01 with respect to the base 284, but in such a way that the stone forming the engagement claw 86 can again penetrate inside the rotation envelope M of the planetary gear wheel 45 and find itself in the engagement position. Therefore, it is possible to stabilize the engagement and disengagement operation of the stone forming an engagement claw 86 with respect to the planetary gear wheel 45.

Fourth Embodiment

[0158] In the following, a fourth embodiment will be described with reference to Figures 19 and 20. The fourth embodiment differs from the first embodiment in that the stone forming the engagement claw 86 is arranged so as to to be able to oscillate around a third axis of rotation 03 different from the first axis of rotation 01. The configurations other elements than those described below are the same as those of the first embodiment.

(Engagement and disengagement lever unit configuration)

Fig. 19 is a plan view of a planet wheel and an engagement and disengagement lever unit of the fourth embodiment, viewed from above.

[0160] As illustrated in Fig. 19, the engagement and disengagement lever unit 380 supports a stone forming an engagement claw 86 so that it can oscillate around the third axis of rotation O3. The third axis of rotation 03 is in an offset position in the plane of the plate 23 (see Figure 4) relative to the first axis of rotation 01 and the second axis of rotation O2. The engagement and disengagement lever unit 380 is fixedly supported by an upper end of a lower level tube 61 of a lower level constant force wheel 60. The engagement and release lever unit The release lever 380 includes an engagement and release lever 384 and a lever spring 394 in place of the engagement and release lever 84 and the lever spring 94 of the first embodiment.

The lever spring 394 is fixedly supported by a lever cap 81. The lever spring 394 includes a base 395 (synchronous rotating part) fixed to the lever cap 81 and a spring main body 397 extending from base 395.

[0162] The base 395 is configured in a ring shape surmounting the first axis of rotation 01. The base 395 is fitted on the outside of the lever cap 81 and is integrally connected to the lever cap 81. Therefore, the base 395 rotates clockwise around the first axis of rotation 01 in synchronization with the rotation of the lower level constant-force wheel 60. The base 395 is provided with a protruding lever pin 398 (first limiting part ). The lever pin 398 is arranged between the engagement claw stone 86 and the first rotation axis 01 when viewed from the vertical direction. The lever pin 398 has a cylindrical shape and projects upward from the base 395. Additionally, the engagement and disengagement lever unit 380 may not include the lever cap 81 and the base 395 could be directly connected to the lower level tube 61 of the lower level constant force wheel 60.

[0163] The spring main body 397 (elastic member) is a thin leaf spring. Spring main body 397 extends from one end of base 395 toward stone forming engagement claw 86 in a counterclockwise direction. The spring main body 397 rotates around the base 395 outward in the radial direction and extends to a position facing the stone forming the engagement claw 86 counterclockwise around of the first axis of rotation 01 when viewed from the vertical direction.

[0164] The engagement and disengagement lever 384 is rotatably mounted around the third axis of rotation O3 relative to the base 395 of the lever spring 394. The third axis of rotation O3 is arranged in a fixed position relative to the base 395 of the lever spring 394. Consequently, the engagement and disengagement lever 384 is arranged in such a way as to be able to perform a movement of revolution around the first axis of rotation 01. In the example illustrated, the third axis of rotation O3 is disposed outside the lever cap 81 in the radial direction with respect to the lever pin 398. The engagement and disengagement lever 384 includes a lever main body 385 and the engagement claw stone 86 supported by lever main body 385.

The lever main body 385 is disposed below the sun gear 45 of the sun gear 43, and above the base 395 of the lever spring 394. The lever main body 385 is supported rotatably relative to base 395 by a lever rotation shaft 389 extending along third axis of rotation O3. The engagement claw stone 86 is fixed to the lever main body 385. Therefore, the engagement claw stone 86 is arranged so as to be able to oscillate around the third axis of rotation O3. The engagement claw stone 86 protrudes from the lever main body 385 toward the planetary gear wheel 45 (upward). The engagement claw stone 86 is disposed outside the lever cap 81 in the radial direction from the third rotation axis O3.

The main lever body 385 bears against the lever pin 398 in the clockwise direction around the third axis of rotation O3. Therefore, movement of the lever main body 385 counterclockwise around the third axis of rotation O3 is restrained by the lever pin 398. That is, the lever spring 394 including the lever pin 398 restricts movement of the stone forming an engagement claw 86 engaged with the planetary gear wheel 45 counterclockwise about the third axis of rotation 03 relative to the base 395.

The main lever body 385 bears against one end of the main spring body 397 of the lever spring 394 coming from the counterclockwise direction around the third axis of rotation O3. Therefore, movement of the lever main body 385 is permitted clockwise around the third axis of rotation 03 relative to the base 395 while being pushed by the spring main body 397 in the counterclockwise direction. clockwise around the third axis of rotation θ3 with respect to the base 395 of the lever spring 394. Therefore, the stone forming the engagement claw 86 fixed to the lever main body 385 is in a state where it has a game to move clockwise around the third axis of rotation O3 with respect to the base 395.

[0168] Here, the third axis of rotation O3 is arranged between the stone forming the engagement claw 86 and the first axis of rotation 01 in the radial direction of the lever cap 81. Therefore, the lever pin 398 of the spring lever 394 restricts the movement of the stone forming the engagement claw 86 into engagement with the planetary gear wheel 45 counterclockwise about the first axis of rotation 01 with respect to the base 395. In addition, the stone forming the engagement claw 86 is in a state where it has play to move clockwise around the first axis of rotation 01 with respect to the constant-force wheel of lower level 60. The direction along the clockwise direction around the first axis of rotation 01 is a direction parallel to the clockwise direction around the first axis of rotation 01 or slightly inclined with respect to the clockwise direction. needles of a clockwise around the first axis of rotation O1. The same is applied to a direction along counterclockwise around the first axis of rotation O1.

(Operation of the engagement and disengagement lever unit)

[0169] In the following, the operation of the engagement and disengagement lever unit 380 having the configuration described above will be described.

[0170] Similarly to the first embodiment, when the planetary gear wheel 45 and the stone forming the engagement claw 86 come into engagement with each other, the tip of a tooth of The stopper 45a of the planetary gear wheel 45 engages with an engagement surface 86a of the stone forming the engagement claw 86 to be in a state of strong mutual compression.

[0171] As the lower level constant force wheel 60 rotates under the impetus of the energy of the constant force spring 100, the base 395 of the lever spring 394 accordingly rotates clockwise around of the first axis of rotation 01. When the base 395 rotates, the engagement and disengagement lever 384 performs a movement of revolution in the direction of clockwise around the first axis of rotation 01. Then, the stone forming the engagement claw 86 included in the engagement and disengagement lever 384 moves clockwise around the first axis of rotation 01, in a state where it has play to move clockwise clockwise around the first axis of rotation 01. Therefore, the engagement and disengagement lever unit 380 can be gradually released from the planetary gear wheel 45, so that the stone forming the claw commitment 86 withdraws re outside the envelope of rotation M of the planetary gear wheel 45. The tip of the stopper tooth 45a moves counterclockwise relative to the engagement surface 86a while by sliding on the engagement surface 86a.

[0172] Fig. 20 is an explanatory view of the operation of a constant torque mechanism of the fourth embodiment and is a plan view of the sun wheel and the engagement and disengagement lever unit, seen from the top.

[0173] When the tip of the stopper tooth 45a comes into contact with the first edge 86a1 of the engagement surface 86a, a force F applied between the stopper tooth 45a and the stone forming the engagement claw 86 approaches clockwise around the first axis of rotation 01. Consequently, the stone forming the engagement claw 86 moves clockwise around the first axis of rotation 01 with respect to at the base 395 of the lever spring 394 with clockwise play about the first axis of rotation 01. As shown in Fig. 20, when the tip of the stopper tooth 45a passes the first edge 86a1 of the engagement surface 86a, the engagement between the stop tooth 45a and the stone forming the engagement claw 86 is released.

[0174] As described above, the constant torque mechanism 330 of the described embodiment comprises the base 395 of the lever spring 394 rotating clockwise around the first axis of rotation 01 in synchronization with the rotation of the lower level constant force wheel 60 in place of the base 95 of the lever spring 94 of the first embodiment. In addition, the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 in accordance with the rotation of the base 395, is able to engage with the wheel of planetary gear 45 and to release itself from it, engages with the planetary gear wheel 45 inside the rotation envelope M of the planetary gear wheel 45 to limit the rotation of the gear wheel 45, and is then moved relative to the base 395 to be able to withdraw outside the rotational envelope M of the planetary gear wheel 45. Therefore, similarly to the first embodiment, the fluctuation of the Torque transmitted from base 395 to escapement 14 via lower level constant force wheel 60 can be suppressed. Consequently, any fluctuation in the torque transmitted to the exhaust 14 can be suppressed.

[0175] Additionally, the constant torque mechanism 30 further includes the main spring body 397 acting indirectly on the stone forming the engagement claw 86 to induce it to move inwardly of the rotation envelope. M via the lever main body 385. According to this configuration, it is possible to prevent the stone forming the engagement claw 86 from being kept in a state where it is pulled out of the rotation envelope M of the wheel gear wheel 45. Therefore, the engagement and disengagement operation of the stone forming the engagement claw 86 with respect to the planet gear wheel 45 can be stabilized.

[0176] Additionally, base 395 of lever spring 394 includes lever pin 398 restricting movement of the stone forming engagement claw 86 into engagement with planetary gear wheel 45 counterclockwise. a clock around the first axis of rotation 01 with respect to the base 395. According to this configuration, when the stone forming the engagement claw 86 rotates clockwise around the first axis of rotation 01 with the base 395, the stone forming the engagement claw 86 can move in a direction along the counterclockwise direction around the first axis of rotation 01 relative to the base 395, but such that it it is possible to prevent the stone forming the engagement claw 86 from ever again being able to be released from the planetary gear wheel 45. Therefore, it is possible to stabilize the operation of engaging and disengaging the stone forming the claw of engagement 86 to planetary gear wheel 45.

In addition, the stone forming the engagement claw 86 is arranged so as to be able to oscillate around the third axis of rotation O3, which is different from the first axis of rotation O1 and from the second axis of rotation O2, with respect to the base 395 of the lever spring 394. According to this configuration, since a rotation shaft of the stone forming the engagement claw 86 is arranged on the third axis of rotation O3 different from the first axis of rotation 01, it is possible to to improve the degree of freedom in the design of the constant torque mechanism 30. In addition, the direction in which the stone forming the engagement claw 86 moves when released from the planetary gear wheel 45 can be tilted with respect to the clockwise direction around the first axis of rotation 01. Therefore, immediately before the clearance between the planetary gear wheel 45 and the stone forming the engagement claw 86, the force F applied between the r planetary gear wheel 45 and the engagement claw stone 86 may lie along the moving direction of the engagement claw stone 86. Therefore, it is possible to allow the engagement stone forming a engagement claw 86 to retract as reliably as possible outside the rotational envelope M of the planetary gear wheel 45, and to stabilize the engagement and disengagement operation of the stone forming an engagement claw engagement 86 with planetary gear wheel 45.

The present invention is not limited to the embodiments described above with reference to the drawings, and various examples of variants are conceivable without departing from the scope of its technical teaching.

[0179] For example, in the embodiments described above, the fixed wheel 31 is an external toothed wheel, but the invention is not limited to this, and the fixed wheel can also consist of an internal toothed wheel. .

[0180] Further, in the embodiments described above, the upper level constant force wheel 40 and the lower level constant force wheel 60 are arranged coaxially, but the invention is not limited. to such a configuration. The wheel connected to the upper level constant force wheel or the lower level constant force wheel could be interposed between the upper level constant force wheel and the constant force spring, or between a lower level constant force wheel and the constant force spring.

[0181] Further, in the embodiment described above, the tip of the stopper tooth 45a of the planetary gear wheel 45 and the first edge 86a1 of the engagement surface 86a of the stone forming the engagement claw 86 are configured as a curved projecting surface, but the invention is not limited to such a configuration. The tip of the stopper tooth of the planetary gear wheel and the edge of the engagement surface of the stone forming the engagement claw may not be formed in this curved surface shape. However, in terms of reducing the contact surface pressure between the planetary gear wheel and the engagement dog stone to suppress the abrasion between the planetary gear wheel and the engagement dog stone , it is preferable that at least one of the tip of the stopper tooth of the planetary gear wheel and the edge of the engagement surface of the stone forming the engagement claw has such a shape of surface projecting in a curved way.

Further, in the embodiments described above, the torque adjusting mechanism 110 is provided in the constant torque mechanism, but the torque adjusting mechanism 110 may not be arranged therein. In this case, in a state where a predetermined preload is applied to the constant-force spring 100, the inner end 102 of the constant-force spring 100 can be fixed to the lower level tube 61.

Moreover, without departing from the spirit of the present invention, it is possible to replace configuration elements of the embodiments described above with well-known configuration elements according to the needs, and moreover each embodiments described above may be combined as appropriate.

Claims (10)

1. Constant torque mechanism (30) comprising: a support (47) rotating around a first axis (O1) using energy provided by an energy source; a planetary gear wheel (45) rotatably mounted on the carrier (47) and performing one full revolution about the first axis (O1) while rotating about a second axis (O2); a constant force spring (100) being energized by the rotation of the bracket (47); a constant force wheel (60) rotating by energy from the constant force spring (100) and transmitting energy from the constant force spring (100) to an escapement; a synchronous rotating part rotating in a first direction of rotation around the first axis (O1) in synchronization with the rotation of the constant force wheel (60); And an engagement claw (86) rotating in the first direction of rotation in accordance with the rotation of the synchronous rotating part, capable of engaging with and disengaging from the planetary gear wheel (45), coming into engaged with the planetary gear wheel (45) when it is within the rotation envelope (M) of the planetary gear wheel (45) to restrict rotation of the planetary gear wheel (45) , and then being moved relative to the synchronous rotary part in order to be able to withdraw outside the rotation envelope (M), the engagement claw (86) being moved in a direction corresponding to the first direction of rotation with respect to the synchronous rotary part to withdraw outside the rotation envelope (M). 2. A constant torque mechanism (30) according to claim 1, further comprising: An elastic element directly or indirectly compressing the engagement claw (86) towards the inside of the rotation envelope (M). 3. A constant torque mechanism (30) according to claim 2, further comprising: a lever body (85) rotatably carrying the engagement claw (86) with respect to the synchronous rotary part, and which is arranged dissociated with respect to the elastic element. 4. Constant torque mechanism (30) according to claim 2, wherein the engagement claw (86) is supported by said resilient member. 5. Constant torque mechanism (30) according to one of claims 1 to 4, wherein the synchronous rotating portion includes a first limiting portion limiting movement of the engagement claw (86), when engaged with the planetary gear wheel (45), in a direction extending along of a second direction of rotation around the first axis (O1) with respect to the synchronous rotating part. 6. Constant torque mechanism (30) according to one of claims 1 to 5, wherein the synchronous rotating part comprises a second limiting part limiting the movement of the engagement claw (86), when the latter has withdrawn outside the rotation envelope (M), in a direction s' extending along the first direction of rotation relative to the synchronous rotating part. 7. Constant torque mechanism (30) according to one of claims 1 to 6, in which the engagement claw (86) is arranged so as to be able to oscillate around the first axis (O1) with respect to the synchronous rotating part. 8. Constant torque mechanism (30) according to one of claims 1 to 6, wherein the engagement claw (86) is arranged oscillating around a third axis (O3) different from the first axis (O1) and the second axis (O2) with respect to the synchronous rotating part. 9. Movement (10) of timepiece (1) comprising the constant torque mechanism (30) according to one of claims 1 to 8. 10. Timepiece (1) comprising the movement (10) of the timepiece (1) according to claim 9.