JP6130773B2 - Barrel - Google Patents

Description

  The present invention relates to a movement barrel for a mechanical timepiece.

  A mechanical timepiece or the like has a barrel in the movement as a power source. The barrel has a cylindrical case structure that houses the mainspring inside, and the inner end of the mainspring is in contact with the rotating shaft located at the center of the barrel, called the barrel barrel true, and the outer end is in contact with the inner wall of the barrel. It is attached. When the mainspring is wound up, rotational force is stored in the barrel, and the barrel is rotated about the barrel true by the force that unwinds the mainspring.

  The barrel is provided with teeth for engagement protruding in the direction of the side wall, and the teeth mesh with a gear called No. 2 wheel which is one of the gear train mechanisms inside the movement, and the rotational force stored in the barrel is It is transmitted to the escapement and speed governor via the gear train mechanism.

  Such an incense box has been manufactured for a long time, and many proposals are seen (for example, refer patent document 1).

Details of the prior art disclosed in Patent Document 1 will be described with reference to FIG.
FIG. 6 is a drawing rewritten without departing from the gist of the prior art described in Patent Document 1 so as to be easy to explain, and schematically shows meshing with a gear train mechanism (second wheel). It is sectional drawing.

  The barrel 10 is provided with a barrel 4 that is a rotating shaft at the center thereof. One end of the mainspring 3 is attached to the barrel 4, and the other end is provided in contact with the inner wall of the barrel 10.

  The mainspring 3 is wound up by being transmitted with the rotational force of the winding stem or the automatic winding mechanism, and rotates the barrel 10 about the axial center 4a of the barrel 4 when unwinding.

  As shown in FIG. 6, teeth 20 for meshing with the gear train mechanism are provided on the barrel 10 so as to protrude from the location of the upper end surface 1a toward the side wall 10b.

  In the vicinity of the barrel 10, a second wheel 6 that can be rotated by the shaft 5 is provided. The second wheel 6 is a gear that rotates around the shaft center 4a of the shaft 5 and constitutes a gear train mechanism. The teeth 20 of the barrel 10 are meshed at the meshing portion 7.

  The distance from the axial center 4a of the barrel 4 to the meshing portion 7 is L0. How many turns the mainspring 3 is wound in the barrel 10 and the size of the barrel 10 depend on the design, but if the distance L0 is determined, the size of the barrel 10 is also determined, and the reduction ratio in the gear train mechanism is also determined.

JP 51-128563 A (page 1-2, FIG. 1)

By the way, it is important for a mechanism using a mainspring in a mechanical timepiece or the like to store a large amount of rotational force in a barrel in order to secure a driving time. That is, a larger-sized barrel can be used. Then, since a longer mainspring can be used, the number of windings of the mainspring can be increased, and a lot of rotational force can be stored.

  However, particularly in a mechanical timepiece, since the barrel is housed inside the movement, the size of the barrel cannot be increased without limitation from the structure of the movement and the condition of meshing with the gear train mechanism. In particular, in the movement of a mechanical timepiece used for a wristwatch with restrictions on dimensions, if the size of the barrel is increased, the size of the timepiece is also affected.

  On the other hand, a large amount of rotational force can be stored without changing the size of the barrel. That is, a mainspring having a thin plate thickness is used. If the mainspring having such a structure is used, the number of turns can be increased, so that a large amount of rotational force can be stored.

  However, in such a mainspring, since the rotational torque when the mainspring is unwound becomes weak, the barrel can not be rotated normally, and conversely, the driving time of a mechanical timepiece or the like may be reduced. .

  As described above, the conventionally known barrels cannot store a larger rotational force without lowering the rotational torque while the size is restricted.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a barrel that can store a larger rotational force even in a movement of a mechanical timepiece used for a wristwatch having a limited size.

  In order to solve the above problems, the barrel of the present invention adopts the following configuration.

  The present invention relates to a barrel that houses a timepiece driving mainspring that fits in the barrel in a true manner. It is characterized by being provided so as to protrude in parallel to the axial direction.

  Thereby, the barrel can be expanded to the space between the barrel and the second wheel, which has conventionally been generated by providing teeth on the barrel side wall, and the number of windings of the mainspring inside the barrel can be increased.

  Moreover, you may make it arrange | position the tooth to transmit in the outermost periphery part of the upper end surface or lower end surface of a barrel.

  Thus, the teeth can be provided at any position on the upper end surface or the lower end surface of the barrel. The number of teeth and the position to be arranged can be freely selected according to the reduction ratio of the gear train mechanism.

  Further, the teeth meshing with the train wheel mechanism can have a meshing position (connection position with the train wheel) equivalent to a conventional barrel having teeth protruding from the side wall. The barrel of the present invention can be incorporated without changing the reduction ratio of the conventional gear train mechanism.

  According to the present invention, it is possible to use a mainspring longer than the conventional one by enlarging the volume inside the barrel, and by storing a lot of rotational force, the driving time of a mechanism using a mainspring such as a mechanical timepiece can be reduced. It is possible to increase.

It is a perspective view explaining the barrel in the 1st Embodiment of the present invention. It is sectional drawing explaining the barrel in the 1st Embodiment of this invention. It is a figure for demonstrating this invention, Comprising: It is sectional drawing compared with the prior art. It is a perspective view explaining the barrel in the 2nd Embodiment of this invention. It is sectional drawing explaining the barrel in the 2nd Embodiment of this invention. It is sectional drawing of the barrel which explains the prior art shown in patent documents 1.

  The barrel of the present invention is provided with teeth that mesh with a gear train mechanism that has been provided so as to protrude from the side wall of the barrel in a direction perpendicular to the barrel rotational axis direction, in a direction parallel to the barrel rotational axis direction. Thus, the barrel can be expanded to the space allowed by the train wheel mechanism.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The first embodiment will be described with reference to FIGS. 1 to 3, and the second embodiment will be described with reference to FIGS. 4 and 5. In the description, the same components are assigned the same numbers. Detailed description will be omitted.
Moreover, in description, the tooth | gear which meshes with the gear train mechanism provided in a barrel is demonstrated in the example provided in the upper end surface of a barrel.
Note that the drawings are schematic diagrams in which portions not related to the invention are omitted for easy explanation.

[Description of First Embodiment: FIGS. 1, 2, and 3]
Hereinafter, the first embodiment will be described in detail with reference to FIGS. FIG. 1 is a perspective view for explaining a barrel and a part of a gear train mechanism that meshes with the barrel. FIG. 2 is a cross-sectional view illustrating a cross-sectional state of the configuration of FIG. FIG. 3 is a cross-sectional view comparing with the prior art.

  The barrel 1 shown in FIG. 1 has a cylindrical case structure, and rotates around the barrel true 4 as a central axis. The upper end surface 1a of the barrel 1 is provided with teeth 2a that mesh with a gear train mechanism protruding in parallel to the axial center 4a of the barrel 4 and in other words, in parallel to the axial direction of the barrel 4. As shown in FIG. 2, the teeth 2a are spaced apart from the axial center 4a of the barrel complete 4 by a distance L1 and are provided on concentric circles. The teeth 2a are expressed in a prismatic shape for easy viewing of the drawing.

The second wheel 6 is a gear constituting a train wheel mechanism. The second wheel can be rotated by a shaft 5. Generally, the axial center 4a of the barrel 5 and the axial center 5a of the shaft 5 are provided in parallel.
The second wheel 6 transmits torque to the gear train mechanism by meshing with teeth 2 a provided on the upper end surface 1 a of the barrel 1 at the meshing portion 7.

  As shown in FIG. 2, the mainspring 3 is accommodated in the barrel 1, and one end of the mainspring 3 is provided in contact with the barrel full 4 and the other end is in contact with the inner wall of the barrel 1.

  The distance L1 from the axial center 4a of the barrel 4 to the tooth 2a can be set freely. The rotation of the barrel 1 is transmitted to a speed governor or escapement (not shown) via a gear train mechanism, and can be freely selected along with the number of teeth of the teeth 2a according to the reduction gear ratio of the gear train mechanism at this time. Good.

As described above, the teeth for meshing with the gear train mechanism that has been provided in the direction of the side wall 1b of the barrel 1 are provided on the upper end surface 1a of the barrel 1 so that the side wall 1b and the shaft center 5a of the shaft 5 The distance L2 can be made smaller.
That is, without changing the size of the movement, the size of the barrel 1 can be increased to a marginal distance where the side wall 1b and the shaft 5 do not contact each other. Therefore, the capacity of the barrel 1 can be increased, a longer mainspring can be used than before, and the driving time of the mechanical timepiece can be increased by storing a large amount of rotational force.

  FIG. 3 shows a comparison with the prior art. 3A corresponds to the sectional view shown in FIG. 6, and FIG. 3B corresponds to FIG. 3A and 3B, the shaft center 4a of the barrel 5 and the shaft center 5a of the shaft 5 are described so as to coincide with each other in the drawings.

  As is apparent from the description with reference to FIGS. 1 and 2 and FIG. 3, the barrel 1 of the present invention can be made larger than the prior art. Furthermore, if the distance L0 from the shaft center 4a of the barrel barrel 4 of the prior art to the meshing portion 7 is the same as the distance L1 of the present invention, the meshing position between the barrel and the gear train mechanism in the movement will not change. can do.

  Of course, depending on the movement, it may be necessary to adjust the position of the engaging portion 7 in the height direction in the figure. Even in such a case, it can be dealt with if the true shape of the barrel is changed or the height of the teeth 2a is changed.

  By doing so, for example, when manufacturing a mechanical timepiece, the driving time can be extended by simply replacing the barrel of the present invention with respect to the movement using the barrel of the prior art. That is, the barrel of the present invention can be used even for a mechanical timepiece that has already been designed.

[Explanation of Second Embodiment: FIGS. 4 and 5]
Hereinafter, the second embodiment will be described in detail with reference to FIGS. 4 and 5. A feature of the second embodiment is that teeth provided on the upper end surface of the barrel are provided on the outermost peripheral portion of the upper end surface. Therefore, FIG. 4 corresponds to FIG. 1, and FIG. 5 corresponds to FIG. In addition, although the tooth | gear provided in the upper end surface 1a of the barrel 1 is the same as that of 1st Embodiment, since the position to install differs, the different number 2b is provided for convenience.

  As shown in FIG. 4, the teeth 2 b provided on the upper end surface 1 a of the barrel 1 are provided on the outer peripheral portion of the barrel 1. The tooth 2b is provided on the outermost peripheral portion so that its end face coincides with the side wall 1b of the barrel 1 and, as shown in FIG. 5, the distance from the axial center 4a of the barrel 4 is a distance L3.

  Also in the second embodiment, the number of teeth 2b can be freely selected according to the reduction ratio of the gear train mechanism, as in the first embodiment described above. And of course, the distance L2 between the side wall 1b and the shaft center 5a of the shaft 5 can be further reduced, and the size of the barrel 1 can be increased without changing the size of the movement.

  Of course, if the distance L0 from the shaft center 4a of the barrel barrel 4 of the prior art to the meshing portion 7 is the same as the distance L3 of the present invention, the meshing position between the barrel and the gear train mechanism in the movement will not change. can do.

  In the two embodiments described above, an example in which the teeth of the barrel that meshes with the gear train mechanism is provided on the upper end surface of the barrel. Of course, the present invention is not limited to this example, and may be provided on the lower end surface of the barrel. Thus, the teeth of the barrel can be provided on either the upper end surface or the lower end surface depending on the structure of the meshing gear train mechanism.

  The present invention is suitable for a barrel as a power source of a mechanical timepiece, particularly a mechanical timepiece having a size restriction such as a wristwatch.

DESCRIPTION OF SYMBOLS 1,10 Incense case 1a Upper end surface of incense box 1b, 10b Side wall of incense box 20, 2a, 2b Teeth meshing with gear train mechanism 3 Mainspring 4 True barrel 4a Axis center 5 Axis of No. 2 car 5a Axis center 6 No. 2 car 7 Engagement Part

Claims (2)

In the barrel that houses the mainspring for the clock drive that fits the barrel perfectly,
A barrel that protrudes from the upper end surface or the lower end surface of the barrel to be parallel to the true axial direction of the barrel by providing teeth that transmit the rotational force when the mainspring is unwound to the gear train mechanism. The barrel according to claim 1, wherein the teeth to be transmitted are arranged on an outermost peripheral portion of an upper end surface or a lower end surface of the barrel.

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