JPH075092U - Structure of watch support member - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a structure of a timepiece support member that prevents a train wheel from falling when a train wheel that is prone to fall is incorporated and that facilitates incorporation of a class. [Structure] A gap between a tooth tip portion 3d of a chronograph wheel 3 and a protrusion portion 4a formed on a circuit support base 4 is particularly narrowed, and a tip portion 3d of a falling chronograph wheel 3 is protruded portion 4a. To prevent the chronograph car from falling further [Effect] It was possible to easily install the class after the wheel train that was prone to fall was installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a timepiece support member.

[0002]

[Prior art]

 Conventionally, when assembling a train wheel that easily falls due to its high center of gravity from the receiving side of the timepiece, the gap is prevented by narrowing the gap between the shaft portion of the train wheel and other components.

FIG. 4 is a sectional view showing the structure of a conventional supporting member, and a chronograph train wheel is used for the description. Since the heart cam 3c fitted with the chronograph wheel stem 3a is located above the chronograph wheel 3b, the center of gravity of the chronograph wheel 3 is off the center axis, and the hole 1a of the main plate 1 is located from above. The inserted chronograph wheel 3 cannot stand upright as it is.

When the clearance between the chronograph wheel stem 3a and the circuit support base 6 is reduced to 35 μm, the chronograph wheel 3 is placed on the circuit support base 6 after the chronograph wheel stem 3a enters the hole 1a of the main plate 1. It will fall down to the point of contact and will be stable, so that the receiving plate 2 can be easily assembled. However, because there is an error in the size and the fixed position of the circuit support base 6, when the chronograph wheel 3 is inserted into the hole 1a of the main plate 1, the chronograph wheel stem 3a and the circuit support base 6 are caught, which makes mounting difficult. I will let you.

As shown in FIG. 3, in order to replace the auxiliary wheel 8 having a gear lower than that of the chronograph wheel 3 with the chronograph wheel 3, the tooth tip portion is Since the lower surface portion 6b of the circuit support base 6 where 8b enters must be largely released from the auxiliary needle gear 8a, the circuit support base 6 cannot be arranged near the chronograph wheel stem 3a. .

In such a case, there is also a method of preventing the chronograph wheel 3 from collapsing by uniformly filling the gap between the upper surface portion 6a of the circuit support base 6 and the tooth top portion 3d of the chronograph gear 3b by 80 μm. Since the thickness of the upper surface portion 6a and the lower surface portion 6b of the circuit support base 6 is only about 200 μm, the circuit support base 6 may be deformed so as to be lifted upward due to aging.

[0007]

[Problems to be solved by the device]

 By the way, in the structure of the conventional timepiece supporting member as described above, the chronograph wheel 3 can be smoothly rotated while avoiding the friction between the upper surface portion 6a and the tooth top portion 3d, so that the upper surface portion 6a and the tooth top portion can be smoothly rotated. If a clearance of 150 μm or more is secured to the portion 3d, the chronograph wheel 3 will be greatly tilted and the receiving plate 2 cannot be incorporated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a structure of a support member that prevents the train wheel from falling and facilitates the incorporation of a class. Is.

[0009]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above-mentioned object is to form a train wheel from the receiving side of a watch. In the structure of a timepiece support member, it is formed on the lower surface side of the addendum of the train wheel and the upper surface side of the support member. It is characterized in that the gap with the protrusion is narrower than the other portions.

[0010]

[Action]

 The structure of the timepiece support member according to the present invention is such that the gap between the lower surface side of the addendum of the train wheel incorporated in the timepiece and the projection formed on the upper surface side of the support member is narrower than other portions. Therefore, even when incorporating a train wheel that is prone to collapse due to the center of gravity being off the central axis, the train wheel can be prevented from collapsing and the catch can be easily incorporated from the top of the train wheel. .

[0011]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a timepiece support member of the present invention, and FIG. 2 is a plan view thereof. A winding stem spacer 5 is incorporated in the main plate 1, and a circuit support base 4 is incorporated from above.

After the chronograph intermediate wheel 7 is installed, the chronograph wheel 3 is installed in the hole 1a of the main plate 1, but the heart cam 3c on the upper surface side of the chronograph gear 3b is press-fitted into the chronograph wheel true 3a. Since the center of gravity is off the central axis, the chronograph wheel 3 cannot stand upright.

As shown in FIGS. 1 and 2, for the timepiece of the present invention in which the gap between the lower surface side of the addendum portion 3d of the chronograph gear 3b and the protruding portion 4a formed on the upper surface side of the circuit support base is particularly narrowed. In the structure of the supporting member, immediately after the chronograph wheel 3 is slightly tilted to the side opposite to the intermediate chronograph wheel 7, the lower surface of the tooth tip portion 3d is supported by the three protruding portions 4a. It is possible to prevent the car 3 from falling.

As a result, since the backing plate 2 and the chronograph wheel stem 3a do not hit each other when the backing plate 2 is mounted from the upper surface side of the timepiece, the backing plate 2 can be easily assembled. Even if the circuit support base 4 is deformed at the same time, the gap between the circuit support base 4 and the chronograph gear 3b other than the protrusion 4a is set to be sufficiently larger than the deformation amount of the circuit support base 4, so that the circuit support base 4 is not deformed. The friction between the gear 4 and the chronograph gear 3b can be prevented as much as possible.

[0015]

[Effect of device]

 As described above, according to the present invention, the gap between the lower surface of the addendum of the wheel train incorporated in the timepiece and the projection formed on the upper surface side of the timepiece support member is particularly narrowed, so that the wheel train that is prone to fall over. It is possible to prevent the fall even when the is installed, and it is possible to easily install the receiving class.

[0016]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a timepiece support member according to an embodiment of the present invention.

FIG. 2 is a plan view showing a structure of a timepiece support member according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a structure of a timepiece support member applied to the present invention and a conventional example.

FIG. 4 is a cross-sectional view showing a structure of a conventional timepiece support member.

[Explanation of symbols]

 1 main plate 1a hole 2 receiving plate 3 chronograph wheel 3a chronograph wheel true 3b chronograph gear 3c heart cam 3d tooth tip 4 circuit support 4a protrusion 5 winding true spacer 6 circuit support 6a upper surface 6b lower surface 7 chronograph Graph Intermediate wheel 8 Secondary needle wheel 8a Secondary needle gear 8b Tooth tip

Front page continuation (72) Kenji Shimoda 6-12 Hommachi Honmachi, Tanashi City, Tokyo Citizen Watch Co., Ltd. Tanashi Manufacturing Co., Ltd. (72) Masami Fukuda 6-12 Hommachi, Tanashi City, Tokyo Citizen Watch Co., Ltd. Tanashi Factory (72) Nobuyuki Uehara 6-12 Hommachi, Tanashi City, Tokyo Citizen Watch Company Tanashi Factory

Claims (1)

[Scope of utility model registration request] 1. A structure of a timepiece support member, in which the upper and lower sides of a train wheel in which a pinion of a first car meshes with a gear of a second car are supported by a receiver and a main plate, and the train wheel is incorporated from a receiving side of a watch. A structure of a timepiece support member, wherein a member having a protrusion is arranged on a side of a main plate near a tooth tip of a gear of a second wheel when the gear of the second wheel is on a receiving side of the gear of the first wheel.