JP2019132596A - Movement and watch - Google Patents

Abstract

To provide a thin movement and a watch while ensuring the duration of a power spring.SOLUTION: A movement includes: a second wheel 42 which is rotatably supported on the front side of a bottom board 21 and to which a rotational force of a movement barrel 41 is transmitted; a third wheel which is rotatably supported on the front side of the bottom board 21 and to which the rotational force of the second wheel 42 is transmitted; a back wheel train 33 which is rotatably supported on the back side of the bottom board 21; and a center transmission wheel 45 which connects between the back wheel train 33 and the second wheel 42 and transmits the rotational force of the second wheel 42 to the back wheel train 33.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a movement and a timepiece.

  In a watch movement, the barrel wheel rotates by the restoring force of the mainspring built in the barrel wheel, so that the rotational force is transmitted to various wheel trains. For example, Patent Document 1 below discloses a configuration in which a second wheel and a third wheel are sequentially connected to a barrel car.

In the following Patent Document 1, the third pinion of the third wheel is meshed with the second gear and the minute wheel of the second wheel. On the other hand, the third gear of the third wheel meshes with the fourth pinion of the fourth wheel.
According to this configuration, the third wheel is rotated by the rotational force of the second wheel, so that the fourth wheel is rotated once in 60 seconds and the minute wheel is rotated once in 60 minutes.

JP 2004-170271 A

  However, in the conventional movement, there is still room for improvement in terms of reducing the movement of the mainspring while ensuring the duration of the mainspring (time until the spring returns to the natural length). That is, the conventional movement has a limitation on the layout of the third wheel because the third wheel is directly connected to both the second wheel and the minute wheel. Therefore, in the plan view seen from the axial direction, for example, when the third wheel and the barrel wheel are arranged to overlap each other, it is necessary to reduce the thickness of the barrel wheel accordingly.

  An object of the present invention is to provide a thin movement and timepiece while ensuring the duration of the mainspring.

  In order to solve the above problems, a movement according to one aspect of the present invention is rotatably supported on the front side of the main plate and is rotatably supported on the front side of the main plate and a second wheel that transmits the rotational force of the barrel complete. A third wheel to which the rotational force of the second wheel is transmitted, a back wheel train rotatably supported on the back side of the main plate, and a connection between the back wheel train and the second wheel And a center transmission wheel for transmitting the rotational force of the center wheel to the rear wheel train.

  According to this aspect, since the rear wheel train is connected to the second wheel via the center transmission wheel, the third wheel is used as both the second wheel and the rear wheel train (for example, the minute wheel) as in the past. Compared to the connected configuration, the degree of freedom in layout of the third wheel & pinion can be improved. Thereby, the third wheel can be moved away from the barrel wheel, and for example, the third wheel and the barrel wheel can be arranged so as not to overlap in a plan view. Therefore, the thickness of the barrel complete can be ensured after the movement is made thinner. By securing the thickness of the barrel, a large mainspring can be accommodated inside the barrel, so that the duration of the mainspring can be secured.

In the movement according to the above aspect, the center transmission wheel may be disposed on the front side of the main plate, and the center transmission wheel and the back wheel train may be connected through a communication opening formed in the base plate.
According to this aspect, the center transmission wheel can be assembled to the main plate in the assembly process on the front side of the main plate, and the connection between the center wheel and the center wheel is facilitated.

In the movement of the above aspect, the center transmission wheel may mesh with a minute wheel constituting the back wheel train.
According to this aspect, since the rotational force of the center wheel is transmitted to the minute wheel via the center transmission wheel, for example, the transmission of the center transmission wheel to the back wheel train as compared with the case where the center transmission wheel is connected to the hour wheel. The ratio can be reduced. Thereby, the rotational force can be smoothly transmitted from the center wheel to the rear wheel train.

In the movement according to the above aspect, the third wheel may be arranged at a position that does not overlap the barrel wheel in a plan view as viewed from the thickness direction of the main plate.
According to this aspect, it is possible to secure the thickness of the barrel complete while suppressing the interference between the third wheel and the barrel complete. As a result, the movement can be thinned while ensuring the duration of the mainspring.

In the movement of the above aspect, the movement has a fourth wheel that is rotatably supported on the front side of the main plate and transmits the rotational force of the third wheel, and a escape wheel that can be engaged with and disengaged from an ankle, and the barrel wheel A speed control escapement that controls the rotation of the escape wheel and an escape wheel intermediate wheel that connects the escape wheel and the fourth wheel.
According to this aspect, since the outer diameter of the fourth wheel (fourth gear) itself can be reduced, it is possible to prevent the fourth wheel and a peripheral member (for example, a square hole wheel) from overlapping in a plan view. Thereby, further thinning of the movement can be realized. In addition, since the outer diameter of the fourth wheel can be reduced, the module (pitch circle diameter / number of teeth) of the fourth wheel is extremely increased in order to secure the speed increasing ratio of the fourth wheel with respect to the escape wheel. There is no need to make it smaller. Thereby, the rotational force of the fourth wheel can be efficiently transmitted to the escape wheel.
Moreover, the layout of the third wheel can be improved by reducing the outer diameter of the fourth wheel.

In the movement of the above aspect, the number of teeth of the third wheel and the number of teeth of the center transmission wheel may be smaller than the number of teeth of the second wheel.
According to this aspect, since the rotation speed of the third wheel and the center transmission wheel is increased with respect to the rotation speed of the second wheel, the number of teeth of the second wheel is easy to set. Thus, unlike the conventional case where the third wheel is used for both the speed increase from the second wheel and the deceleration to the minute wheel, the transmission efficiency of the rotational force can be improved.

The timepiece according to one aspect of the present invention may include the movement according to the above aspect.
According to this aspect, a watch that is thin and has a long duration can be provided.

  According to one aspect of the present invention, it is possible to provide a thin movement and timepiece while ensuring the duration of the mainspring.

It is an external view of a timepiece. It is the top view which looked at the movement from the front side. It is the top view which looked at the movement from the back side. FIG. 4 is a cross-sectional view corresponding to line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view corresponding to line VV in FIG. 2. It is sectional drawing corresponded in the VI-VI line of FIG.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[clock]
FIG. 1 is an external view of the timepiece 1. In each of the drawings shown below, in order to make the drawing easier to see, some of the timepiece parts are not shown, and the timepiece parts may be simplified in some cases.
As shown in FIG. 1, the timepiece 1 of the present embodiment is configured by a movement 2, a dial 3, hands 4 to 6 and the like incorporated in a timepiece case 7.

  The watch case 7 includes a case main body 11, a case lid (not shown), and a cover glass 12. A crown 15 is provided at the 3 o'clock position (the right side in FIG. 1) on the side surface of the case body 11. The crown 15 is for operating the movement 2 from the outside of the case body 11. The crown 15 is fixed to a winding stem 19 inserted into the case main body 11.

[Movement]
The movement 2 is configured such that a plurality of gears and the like are rotatably supported on a base plate 21 constituting the substrate of the movement 2. The above-described winding stem 19 is incorporated in the main plate 21. The winding stem 19 is used to correct the date and time. The winding stem 19 is rotatable about its axis and is movable in the axial direction. In the following description, the cover glass 12 side (the dial plate 3 side) of the watch case 7 with respect to the base plate 21 is referred to as the “back side” of the movement 2, and the case lid side (the opposite side to the dial plate 3 side) is the movement. 2 is “front side”. Each gear described below is provided with the front and back surfaces of the movement 2 as the axial direction.

FIG. 2 is a plan view of the movement 2 as viewed from the front side. FIG. 3 is a bottom view of the movement 2 as seen from the back side.
The movement 2 has a front wheel train 31 and a speed control escapement 32 arranged on the front side with respect to the main plate 21 as shown in FIG. 2, and a rear side arranged on the back side with respect to the main plate 21 as shown in FIG. And a train wheel 33.

<Front wheel train>
4 is a cross-sectional view corresponding to the line IV-IV in FIG.
As shown in FIG. 4, the front wheel train 31 mainly includes a barrel wheel 41, a second wheel 42, a third wheel 43, a fourth wheel 44, and a center transmission wheel 45 (see FIG. 6). The front wheel train 31 constitutes a speed increasing wheel train in which the number of rotations increases as the gear is located in the rear stage.

  The barrel complete 41 is rotatably supported between the main plate 21 and the barrel holder 51. The barrel complete 41 has a mainspring (not shown) as a power source of the timepiece 1 inside. The mainspring is wound up through the square hole wheel 46 by rotating the winding stem 19, for example. The barrel complete 41 is rotated by a rotational force (restoring force) when the mainspring is rewound. In the timepiece 1 of the present embodiment, the mainspring can be wound up by rotating the rotary weight 40 according to the movement of the user. However, the movement 2 may be configured without the rotating weight 40.

  The center wheel & pinion 42 is rotatably supported between the main plate 21 and the train wheel bridge 52. The axis of the center wheel & pinion 42 is disposed at a position where it does not overlap with the barrel complete 41 in a plan view as viewed from the front and back surfaces. The second pinion 42 a of the second wheel 42 is meshed with the barrel gear 41 a of the barrel 41. Thereby, the center wheel & pinion 42 is rotated by the rotational force transmitted from the barrel complete 41.

  The third wheel & pinion 43 is rotatably supported between the main plate 21 and the train wheel bridge 52. The axis line of the third wheel & pinion 43 is arranged at a position where it does not overlap with the barrel complete 41 and the second wheel & pinion 42 in plan view. The third pinion 43 a of the third wheel 43 is meshed with the second gear 42 b of the second wheel 42. In the present embodiment, the number of teeth of the third pinion 43a is smaller than the number of teeth of the second gear 42b.

  The third gear 43b of the third wheel & pinion 43 is disposed at a position where it does not overlap with the barrel complete 41 in a plan view. Specifically, the third gear 43b is disposed within the thickness range of the barrel complete 41 (the barrel 41b) in the front and back direction. However, the third gear 43b may be arranged at a position shifted in the front and back direction with respect to the barrel 41b.

  The fourth wheel & pinion 44 is rotatably supported between the main plate 21 and the train wheel bridge 52. The fourth wheel 44 is arranged coaxially with the center of the movement 2. The fourth pinion 44a of the fourth wheel 44 is meshed with the third gear 43b. A fourth stem 44 b of the fourth wheel 44 is rotatably inserted into a center pipe 47 fixed to the main plate 21. The center pipe 47 penetrates the base plate 21 in the front and back direction and protrudes to the back side of the base plate 21. In the fourth wheel 44, the back side end of the fourth wheel 44 b protrudes to the back side from the center pipe 47.

<Controlled escapement>
As shown in FIG. 2, the speed governor escapement 32 is connected to the rear stage of the front wheel train 31 via an escape wheel 48. The speed control escapement 32 controls the rotation of the barrel complete 41. The governor escapement 32 includes an escape wheel 61, an ankle 62, and a balance 63.

FIG. 5 is a cross-sectional view corresponding to the line VV in FIG.
As shown in FIG. 5, the escape wheel 61 is rotatably supported between the main plate 21 and the escape guard 54. The escape wheel 61 a of the escape wheel 61 meshes with the intermediate gear 48 a of the escape wheel intermediate wheel 48. The gangue intermediate wheel 48 is rotatably supported between the train wheel bridge 52 and the gantry bridge 54. The intermediate pinion 48 b of the escape wheel intermediate wheel 48 meshes with the fourth gear 44 c of the fourth wheel 44. The hook 61a may be configured to mesh directly with the fourth gear 44c.

  As shown in FIG. 2, the ankle 62 is rotatably supported between the main plate 21 and the ankle receiver 55 with the front and back directions being the front and back directions. The ankle 62 includes a pair of pallet stones 65a and 65b. The pallet stones 65 a and 65 b are alternately engaged with the escape wheel 61 b of the escape wheel 61 as the ankle 62 reciprocates. The escape wheel 61 temporarily stops rotating when one of the pair of pawl stones 65a and 65b is engaged with the escape wheel 61b. The escape wheel 61 rotates when the pair of pallet stones 65a and 65b is detached from the escape wheel 61b. By repeating these operations continuously, the escape wheel 61 rotates intermittently.

  The balance with hairspring 63 adjusts the escape wheel 61 (the escape wheel 61 is retreated at a constant speed). Specifically, the balance 63 is supported so as to be rotatable between the main plate 21 and the balance holder 56 with the front and back direction as the axial direction. Specifically, the balance with hairspring 63 reciprocates at a constant frequency by the power transmitted from the hairspring 67 (see FIG. 5). The balance with hairspring 63 repeats engagement and disengagement of the ankle 62 with the ankle lever 62a (see FIG. 5) in synchronization with the reciprocating rotation. As a result, the ankle 62 reciprocally rotates so that the pawl stones 65 a and 65 b are repeatedly engaged and disengaged from the escape wheel 61.

<Back wheel train>
6 is a cross-sectional view corresponding to the line VI-VI in FIG.
As shown in FIGS. 3 and 6, the back train wheel 33 mainly includes a minute wheel 71, a minute wheel 72 (see FIG. 3), and an hour wheel 73.
As shown in FIG. 6, the minute wheel 71 is rotatably attached to the center pipe 47 described above on the back side of the main plate 21. The minute wheel 71 is connected to the front wheel train 31 via the center transmission wheel 45.

As shown in FIG. 3, the minute wheel 72 is rotatably supported by the main plate 21. The minute wheel 72 a of the minute wheel 72 is meshed with the minute pinion 71 a of the minute wheel 71.
As shown in FIG. 5, the hour wheel 73 is extrapolated to the minute wheel 71. The hour wheel 73 is configured to be rotatable with respect to the minute wheel 71 between the main plate 21 and the hour wheel holder 58. The hour wheel 72 b (see FIG. 3) of the hour wheel 72 is engaged with the hour wheel 73.

In the present embodiment, the number of teeth is set so that the above-mentioned fourth wheel & pinion 44 rotates once in 60 seconds. In the fourth wheel & pinion 44, a second hand 6 is attached to a rear side end portion of the fourth wheel & pinion 44b.
The minute wheel 71 is set with the number of teeth so that it rotates once in 60 minutes. In the minute wheel 71, a minute hand 5 is attached to a portion protruding rearward from the hour wheel presser 58.
The hour wheel 73 is set with the number of teeth so that it rotates once in 12 hours. In the hour wheel 73, the hour hand 4 is attached to a portion protruding rearward from the hour wheel presser 58.

  Here, as shown in FIG. 6, the above-described center transmission wheel 45 connects the second wheel 42 and the minute wheel 71. The center transmission wheel 45 is rotatably supported by the part located in the back side of the barrel complete 41 in the main plate 21. In the plan view shown in FIG. 6, the entire center transmission wheel 45 overlaps the barrel complete 41 in the plan view. However, the center transmission wheel 45 may be disposed at a position that partially overlaps the barrel complete 41 in a plan view, or may be disposed at a position not overlapping the barrel complete 41.

  In this embodiment, the center transmission wheel 45 is located behind the third gear 43b. The transmission gear 45a of the center transmission wheel 45 meshes with the second gear 42b. That is, the rotational force of the center wheel & pinion 42 is transmitted to the center transmission wheel 45 and the center wheel & pinion 43 through the second gear 42b.

  In the base plate 21, a communication opening 21 a that connects the front side and the back side of the base plate 21 is formed at a position adjacent to the center transmission wheel 45. A minute wheel 71b of the minute wheel 71 and a transmission pinion 45b of the center transmission wheel 45 face the communication opening 21a. The minute gear 71b and the transmission pinion 45b mesh with each other through the communication opening 21a. In the present embodiment, the configuration in which the center wheel & pinion 42 and the minute wheel 71 are connected by one central transmission wheel 45 has been described. However, the present invention is not limited to this configuration. For example, the second wheel 42 and the minute wheel 71 may be connected by a plurality of center transmission wheels.

<Clock operation>
Next, the operation of the timepiece 1 will be described.
In the timepiece 1 of the present embodiment, when the barrel wheel 41 is rotated by the restoring force of the mainspring, the second wheel 42, the third wheel 43, and the fourth wheel 44 are rotated while being controlled by the speed control escapement 32.

The rotational force of the center wheel & pinion 42 is transmitted to the center transmission wheel 45 in addition to the center wheel & pinion 43. Thus, the minute wheel 71 rotates as the center transmission wheel 45 rotates. The rotational force of the minute wheel 71 is transmitted to the hour wheel 73 via the minute wheel 72, whereby the hour wheel 73 rotates.
Thereby, the timepiece 1 keeps time.

Thus, in this embodiment, it was set as the structure provided with the center transmission wheel 45 which connects the center wheel & pinion 42 and the back wheel train 33 (minute wheel 71).
According to this configuration, since the back wheel train 33 is connected to the second wheel 42 via the center transmission wheel 45, the third wheel is connected to both the second wheel and the minute wheel as in the prior art. Compared to the above, the degree of freedom in layout of the third wheel & pinion 43 can be improved. Thereby, the third wheel 43 can be moved away from the barrel complete 41 and, for example, the third wheel 43 and the barrel 41 can be arranged so as not to overlap each other in plan view. Therefore, the thickness of the barrel complete 41 can be ensured after the movement 2 is thinned. By securing the thickness of the barrel wheel 41, a large mainspring can be accommodated inside the barrel wheel 41, so that the duration of the mainspring can be secured.

In the present embodiment, the center transmission wheel 45 is arranged on the front side of the main plate 21, and the center transmission wheel 45 and the minute wheel 71 are connected through the communication opening 21 a of the main plate 21.
According to this configuration, the center transmission wheel 45 can be assembled to the main plate 21 in the assembly process on the front side of the main plate 21, and the second wheel 42 and the center transmission wheel 45 can be easily connected.

In the present embodiment, the center transmission wheel 45 is connected to the minute wheel 71 of the rear wheel train 33.
According to this configuration, since the rotational force of the center wheel & pinion 42 is transmitted to the minute wheel 71 via the center transmission wheel 45, for example, the rear wheel train 33 is compared with the case where the center transmission wheel 45 is connected to the hour wheel 73. The transmission ratio of the center transmission wheel 45 with respect to can be reduced. Thereby, transmission of the rotational force from the front wheel train 31 to the back train wheel 33 can be performed smoothly.

In the present embodiment, the third wheel & pinion 43 is arranged at a position where it does not overlap with the barrel complete 41 in a plan view.
According to this configuration, the thickness of the barrel complete 41 can be secured while suppressing interference between the third wheel 43 (third gear 43 b) and the barrel complete 41. As a result, the movement 2 can be thinned while ensuring the duration of the mainspring.

In the present embodiment, the fourth wheel 44 and the escape wheel 61 are connected via an intermediate escape wheel 48.
According to this configuration, since the outer diameter of the fourth wheel 44 (fourth gear 44c) itself can be reduced, the fourth gear 44c and peripheral members (for example, the square wheel 46) are prevented from overlapping in plan view. it can. Thereby, the further thickness reduction of the movement 2 is realizable. In addition, since the outer diameter of the fourth gear 44c can be reduced, a module of the fourth gear 44c is secured in order to ensure a speed increasing ratio of the fourth gear 44c with respect to the escape wheel 61 (the escape wheel 61a). There is no need to make (pitch circle diameter / number of teeth) extremely small. Thereby, the rotational force of the fourth wheel 44 can be efficiently transmitted to the escape wheel 61.
Moreover, the layout of the third wheel & pinion 43 can be improved by reducing the outer diameter of the fourth gear 44c.

In the present embodiment, the number of teeth of the third wheel 43 (third gear 43b) and the number of teeth of the center transmission wheel 45 (transmission gear 45a) are smaller than the number of teeth of the second wheel 42 (second gear 42b). It was.
According to this configuration, the number of rotations of the third wheel 43 and the center transmission wheel 45 is increased with respect to the number of rotations of the second wheel 42, so that the number of teeth of the second gear 42 b can be easily set. As a result, unlike the case where the third wheel (third wheel) is used for both the acceleration from the second wheel (second gear) and the deceleration to the minute wheel as in the past, the rotational force is reduced. Transmission efficiency can be improved.

  Since the timepiece 1 of the present embodiment includes the movement 2 described above, it is possible to provide a timepiece 1 that is thin and has a long duration.

(Other variations)
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the appended claims.
For example, in the above-described embodiment, the configuration in which the center wheel & pinion 42 and the minute wheel 71 are connected via the center transmission wheel 45 has been described, but the configuration is not limited thereto. For example, the center transmission wheel 45 may be connected to any one of the gears (for example, the hour wheel 73) constituting the back wheel train 33.

In the above-described embodiment, the configuration in which the center transmission wheel 45 is arranged on the front side with respect to the main plate 21 has been described, but the configuration is not limited to this configuration. The center transmission wheel 45 may be arranged on the back side with respect to the main plate 21.
In the above-described embodiment, the configuration in which the center transmission wheel 45 increases the rotation speed of the center wheel & pinion 42 and transmits it to the rear wheel train 33 has been described. However, the present invention is not limited to this configuration. The center transmission wheel 45 may reduce the rotational speed of the center wheel & pinion 42.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by a known component, and you may combine each modification mentioned above suitably.

DESCRIPTION OF SYMBOLS 1 ... Clock 2 ... Movement 21 ... Base plate 21a ... Communication opening 32 ... Control escapement 33 ... Back train wheel 41 ... barrel wheel 42 ... Second wheel 43 ... Third wheel 44 ... Fourth wheel 45 ... Central transmission wheel 61 ... the escape wheel 71 ... minute drive

Claims (7)

A second wheel that is rotatably supported on the front side of the main plate and transmits the rotational force of the barrel complete,
A third wheel that is rotatably supported on the front side of the main plate, and to which the rotational force of the second wheel is transmitted;
A back train wheel rotatably supported on the back side of the base plate;
A movement comprising: a center transmission wheel that connects the back wheel train and the second wheel train and transmits the rotational force of the second wheel train to the back wheel train. The center transmission wheel is disposed on the front side of the main plate,
The movement according to claim 1, wherein the center transmission wheel and the back wheel train are connected through a communication opening formed in the main plate.   The movement according to claim 1 or 2, wherein the center transmission wheel meshes with a minute wheel constituting the back wheel train.   The movement according to any one of claims 1 to 3, wherein the third wheel is arranged at a position that does not overlap the barrel wheel when viewed from the thickness direction of the main plate. A fourth wheel which is rotatably supported on the front side of the main plate and to which the rotational force of the third wheel is transmitted;
A speed escapement having a escape wheel that can be engaged with and disengaged from the ankle, and controlling the rotation of the barrel wheel,
The movement according to any one of claims 1 to 4, further comprising an escape wheel intermediate wheel that connects the escape wheel and the fourth wheel.   The movement according to any one of claims 1 to 5, wherein the number of teeth of the third wheel and the number of teeth of the center transmission wheel are smaller than the number of teeth of the second wheel.   A timepiece comprising the movement according to claim 6.

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