JP2021517644A - A system for blocking the claw wheel of a watch barrel - Google Patents

Abstract

SOLUTION: This is a system (1) for blocking a claw wheel (3) of a watch barrel (2), and the system is mounted on a frame (50) in a swivel manner on the frame. A gear train (20) including a lever (4) and at least one first toothed gear (6) mounted on the lever and / or the frame in a swivel manner, and the lever on the gear train. A system comprising a spring (5) that returns the lever to a stationary position that meshes with the lever (3). [Selection diagram] Fig. 1

Description

The present invention relates to a system for blocking a claw wheel of a watch barrel. The present invention also relates to a watch mechanism, including the system. The present invention also relates to a timepiece including the system or the timepiece mechanism.

A watch with a mechanical movement that is mechanically wound contains a barrel, the claw wheel of which can rotate in only one direction around its axis due to the action of the blocking system. The blocking system is the nail.

The claws absorb part of the energy transmitted to the barrel and generate a clicking noise while winding the barrel.

International Publication No. 2015/193809 Swiss Patented Invention No. 700806

An object of the present invention is to provide a blocking system capable of correcting the above-mentioned drawbacks and improving a system known from the prior art. In particular, the present invention proposes a blocking system that enables optimization of energy transfer to the barrel and limits the noise of the blocking system during the winding of the barrel.

The system according to the present invention is defined in claim 1.

Various embodiments of the component are defined in claims 2-9.

The mechanism according to the present invention is defined in claim 10.

The clock according to the present invention is defined in claim 11.

The accompanying drawings show an embodiment of a timepiece according to the present invention as an example.

FIG. 1 is a schematic diagram of an embodiment of a timepiece in which the blocking system is in the first configuration. FIG. 2 is a schematic diagram of an embodiment of a timepiece in which the blocking system is in the second configuration. FIG. 3 is a schematic diagram of an embodiment of a timepiece in which the blocking system is in the third configuration.

An embodiment of the clock 200 will be described below with reference to FIGS. 1 to 3. The watch is, for example, a small watch, especially a wristwatch. The watch includes a watch mechanism, in particular a mechanical watch movement 100. The watch movement is, for example, a manual winding type or an automatic winding type.

The movement includes a barrel and a system 1 for blocking the barrel to prevent the barrel from loosening or unraveling, while allowing the barrel to be rolled up or tightened.

The barrel is rotatably mounted around a shaft 32 on the frame 50 of the movement. The barrel mainly includes a barrel, a body, and a royal fern, and the shaft and the body are wound around the shaft and mechanically connected by the royal fern contained in the body. The barrel Makoto is mechanically connected to a manual or automatic hoisting gear train.

When the watch is wound, the barrel Makoto is rotationally driven around a shaft 32 with respect to the frame and body to wind, tighten or compress the mainspring. Therefore, the barrel Makoto is rotationally driven via the claw wheel 3.

While driving the movement, the barrel barrel is rotationally driven around a shaft 32 relative to the frame and true to drive the gear train of the watch. For this reason, the barrel body includes a dentition that meshes with the first gear of the watch gear train.

In the illustrated embodiment, the blocking system allows the claw wheel to rotate clockwise around a shaft 32 in its first configuration shown in FIG. This allows the watch to be wound up.

In the illustrated embodiment, the blocking system prevents counterclockwise rotation about the claw wheel shaft 32 with respect to the frame 50 in its second configuration shown in FIG. This makes it possible to prevent the mainspring from loosening except when the gear train of the watch is being driven.

For this reason, the blocking system allows unidirectional blocking of barrels, especially true or barrel claw wheels. The blocking system also allows unidirectional rotation of the barrel, especially the true or barrel of the barrel, with respect to the frame.

As described above, the blocking system 1 enables conditional blocking of the claw wheel 3 of the watch barrel 2.

The blocking system is
-Frame 50 and
-Lever 4 mounted on the frame in a swivel manner,
-A gear train 20 including at least one toothed gear 6 mounted on a lever and / or frame in a swivel manner.
− Return the lever to the stationary position where the gear train meshes with the claw wheel 3, the spring 5 and
Including
The gear train includes the dentitions 61 and 71 of the irreversible gear 30.

The lever 4 is mounted on the frame so as to be rotatable around the shaft 8. The axis is, for example, parallel to the axis 32. Preferably, the lever is of a monostable type. Therefore, the lever is returned to the first, stationary or return position. This first stationary or return position is shown in FIGS. 1 and 2. This return is guaranteed by the spring 5. The spring is advantageously manufactured with or integrated with the lever. The spring abuts on the fastener 51 of the frame, or more generally of the movement, to ensure elastic return to the first position of FIGS. 1 and 2. For example, the spring 5 is a leaf spring 5.

The lever 4 includes a retaining surface 12 that cooperates with the fastener 10 of the frame, or more generally of the movement. The stopper 10 may be a pin. The cooperation by contact between the retaining surface 12 and the fastener 10 defines the first position of the lever 4 shown in FIGS. 1 and 2. Therefore, the above-mentioned spring 5 can return the stop surface 12 to the contact with the stopper 10.

The lever supports at least a portion of the gear train 20. In other words, one or more elements 6 and 7 constituting the gear train are mounted on the lever 4, particularly on the arm 41 of the lever 4 in a swivel manner. For example, the single element or all the elements 6 and 7 constituting the gear train are mounted on the lever 4 in a swivel manner, particularly on the arm 41 of the lever 4. In the illustrated embodiment, the gear train includes a first toothed gear 6 and a second toothed gear 7. The first and second toothed gears are arranged on the lever so that they mesh permanently with each other.

The first toothed gear 6 is mounted on the frame 50 in a manner that allows it to rotate around a shaft 8. The second toothed gear 7 is mounted on the lever in a manner that allows it to rotate around the shaft 9. Preferably, the shafts 8 and 9 are parallel to each other and parallel to the barrel 32 of the barrel. Also preferably, the shaft on which the first toothed gear is swiveled around it on the lever is the shaft on which the lever is swiveled around it on the movement. The first toothed gear 6 is mounted so as to be rotatable around the shaft 8. Therefore, the first toothed gear can be regarded as being swiveled on the lever, provided that it can swivel freely with respect to the lever.

In the illustrated embodiment, the first gear 6 has a first dentition 61 and the second gear 7 has a second dentition 71. These first and second dentitions are arranged to form an irreversible gear between the first and second gears. Therefore, when the second gear is a driving gear and rotates in the counterclockwise direction, the second gear rotationally drives the first gear, so that the first gear becomes a driven gear (see FIG. 1). However, when the second gear is a drive gear and rotates clockwise, the gear is blocked and the rotation of the second gear is blocked by the first gear (see FIG. 2). Specifically, the shapes of the first and second gears bring the tips of the teeth of the first and second dentitions into contact when the second gear, which rotates clockwise, starts driving the first gear.

In this embodiment, the irreversibility of the gears is guaranteed by the particular profiles of the first and second dentitions 71 and the placement of the first and second gears. Separately from the illustrated first and second dentition profiles, other dentition profiles may be used to form the irreversible gear, in particular the dentitions illustrated in Patent Documents 1 and 2. can.

Preferably, the dentition 31 of the square hole wheel is completely conventional. In particular, the dentition 31 is a dentition whose profile is a standard watch profile.

Preferably, the first dentition contains less than 30, less than 20, or less than 10 teeth, and or the second dentition has less than 30, less than 20, or 10 teeth. Contains fewer teeth than a book.

In the stationary or return position of the lever shown in FIGS. 1 and 2, the gear train 20, especially the second gear 7, meshes with the claw wheel. At the second position of the lever shown in FIG. 3, the lever turns and the dentition 31 of the claw wheel no longer meshes with the gear row 20, especially the dentition 71 of the second gear 7. The second position defines a third configuration of the blocking system. Specifically, the dentitions 31 and 71 are located apart from each other. In the third configuration, the claw wheel is freely rotatable about the axis 32 with respect to the frame 50, particularly in the counterclockwise direction. The second position can be defined by the cooperation of the contact surface 11 of the lever and the stopper 10. The second position allows the royal fern to be rewound, for example to disassemble the movement. The third configuration is shown in FIG.

The lever has, for example, a first arm 41 on which the gear train is mounted. The lever has, for example, a second arm 42 on which stopping surfaces 11 and 12 provided to limit the turning amplitude of the lever 4 in cooperation with one or more fasteners 10 are mounted. The lever has, for example, a third arm 43 formed by a spring 5. The three arms are distributed, for example, in a T-shape, i.e. so that the three arms form substantially two right angles.

Advantageously, the gear train and the lever are arranged so that the claw wheel driven in the rewinding direction (ie, counterclockwise direction) of the main shaft brings the action of driving the lever to the stationary position on the gear train. NS.

In the embodiment described above, the lever includes three arms that ensure the function of supporting the gear train, limiting the turning amplitude, and elastically returning the lever. As a variant, the arms may be geometrically organized in other ways. Further, as a modification, the functions guaranteed by these three arms may be organized differently on the arms, in particular any of these functions may be integrated into the same arm. Therefore, the lever may have only two arms or only one arm.

In the above-described embodiment and its modifications, the first and second dentitions are characteristic. As a modification, only the first dentition or only the second dentition is characteristic, and the profile may cooperate with the second dentition or the first dentition, which are standard watch profiles, respectively.

In the above-described embodiment and its modifications, the irreversible gear is formed between the second gear and the first gear. However, as a modification, the irreversible gear may be formed between the gear train and the claw wheel. In this case, the tooth profile of the claw wheel is preferably a standard watch profile, and the gear tooth profile of the gear train that meshes with the claw wheel produces irreversibility when meshing with the standard profile tooth. It is a characteristic profile.

In the above embodiments and variations thereof, the gear train includes two gears. However, as a modification, the gear train may include a single gear. In this case, the gear is not swiveled on the lever around the axis on which the lever swivels around it on the frame. As a further modification, the gear train may include two or more gears, in particular three or four gears.

In the above embodiments and variations thereof, the gear train includes gears that swivel on the frame in a shaft around which the lever swivels on the frame. However, as a modification, the gear train may include gears that swivel on the frame at locations other than the axis on which the lever swivels around it. In this case, the gear train includes at least two gears. Further, in this case, the mesh between the gear that swivels on the frame and the gear that swivels on the lever may be cut at the second position of the lever.

In the present specification, the expression "irreversible gear" is the meshing of the second dentition with the first dentition, and the first dentition can be driven in only one direction while the second dentition is being driven. Yes, it is understood to mean a bite in which the first and second dentitions are blocked in the other direction. Advantageously, the blocking is obtained by the shape of the first and / or second dentition. In particular, blocking is brought about by the butt phenomenon.

The operation of the watch 200, especially the movement 100, will be described below.

It is assumed that there is no action on the lever 4, especially no action by the watchmaker on the lever 4. Therefore, the lever is in the first position shown in FIGS. 1 and 2.

The automatic or manual hoisting power transmission device is premised on driving the claw wheel clockwise. This drive causes compression or hoisting of the main royal fern. Because of the rotation of the claw wheel, the dentition 31 drives the dentition 71 of the second gear 7 that rotates counterclockwise. Because of the rotation of the second gear, the dentition 71 drives the dentition 61 of the first gear 6 which rotates clockwise. The rotation of the first and second gears is free with no resistance or substantially no resistance. The only resistances to overcome are the meshing friction of the dentition and the turning friction of the gears on the lever. These resistances are very small.

Here, the automatic or manual winding power transmission device no longer holds the claw wheel (in the case of a manual winding small watch, when the winding of the small watch is completed, or in the case of an automatic small watch, in the middle of disassembly. Or) is assumed. The claw wheel tends to rotate counterclockwise under the effect of the main royal fern. However, the rotation is prevented as described below. Specifically, it is a possible rotation of the claw wheel 3 in the counterclockwise direction, and during the rotation, the second gear is driven in the clockwise direction because of the meshing of the tooth rows 31, 71 and 61. Following the rotation in which the first gear is driven counterclockwise, the teeth of the second dentition come into contact with the tips of the teeth of the first dentition. This results in blocking due to the butt rotation of the second dentition, forming an obstacle to the rotation of the claw wheel in the counterclockwise direction. The butt occurs because the force F1 (indicated by the arrow) of the first dentition 61 on the second dentition is directed in the direction in which the first gear passes the shaft 8 that swivels around it. As shown in FIG. 2, the force F1 on the second gear of the first gear opposes the torque generated around the shaft 9 by the force F2 (indicated by the arrow) on the second gear of the claw wheel, the shaft 9 Generates torque around it. The force F2 exerted on the lever by the claw wheel turns the lever clockwise around the rotation axis 8 or returns the lever to its stationary position, particularly to the position where the stop surface 12 contacts the stopper 10. Note that there is a tendency. The spring 5 also tends to rotate the lever in the same direction.

However, during maintenance work, it is necessary to loosen the mainspring and make it possible to release the energy stored in the barrel. For this reason, the lever 4 (by the watchmaker) is actuated to move from a stationary position. Therefore, the force applied by the spring 5 becomes invalid, and the action on the lever of the claw wheel becomes invalid. When the lever reaches the turning amplitude, the dentition of the claw wheel and the second gear no longer meshes, and the claw wheel is also free to rotate counterclockwise. The lever is moved to a second position defined by contact of the stopper 10 with the retaining surface 11, particularly as shown in FIG.

Because of the blocking system mentioned above
− No claws or no claws
− It can be easily released by a simple action (called lever rotation) by a watchmaker.
− Optimize the transfer of energy to the barrel,
− Limit the noise generated during the winding of the barrel,
It becomes possible to obtain a blocking system.

Claims (11)

It is a system (1) for blocking the claw wheel (3) of the watch barrel (2), and the system is
Frame (50) and
A lever (4) mounted on the frame in a swivel manner and
A gear train (20) including at least one first toothed gear (6) mounted on the lever and / or the frame in a swivel manner.
A spring (5) that returns the lever to a stationary position where the gear train meshes with the claw wheel (3).
Including
The gear train comprises a dentition (61; 71) of an irreversible gear (30). The gear train includes the first toothed gear and a second toothed gear (7), particularly a second toothed gear mounted on the lever (4) in a swingable manner.
The blocking system (1) according to claim 1. The irreversible gear is formed between the first gear and the second gear.
The blocking system according to claim 2. The first toothed gear is mounted in a swivel manner around a shaft (8) at which the lever swivels on the frame, particularly in a swivel manner on the lever.
The blocking system according to any one of claims 1 to 3. The irreversible gear is formed between the gear train and the claw wheel.
The blocking system according to any one of claims 1 to 4. The spring is a leaf spring (5), particularly a leaf spring (5) manufactured with or integrated with the lever.
The blocking system according to any one of claims 1 to 5. The system includes a stopper (10) that cooperates with the surface (12) of the lever (4) to define the stationary position of the lever.
The blocking system according to any one of claims 1 to 6. The gear train and the lever are arranged so that the claw wheel driven in the unwinding direction of the main royal fern exerts an action of driving the lever toward the stationary position on the gear train.
The blocking system according to any one of claims 1 to 7. The blocking system according to any one of claims 1 to 8, which has no claws. A watch mechanism (200), particularly a watch movement, comprising the system (1) according to any one of claims 1-9. A watch (200), particularly a wristwatch, comprising the mechanism according to claim 10 and / or the system according to any one of claims 1-9.

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