JPH0648467Y2 - Pendulum balance ball mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pendulum balancing ball mounting structure in a character timepiece having a timepiece pendulum having a structure commonly known as "Yajirobe".

(Prior Art) Conventionally, as shown in FIG. 5, a pair of balance spheres (1,1) of a pendulum timepiece having a structure commonly known as "Yajirobe" is a C-ring-shaped axial pipe that is a balance shaft. Two
When attaching to both ends (2A, 2B) of, respectively, divide the pair of balance spheres (1, 1) into left and right hemispherical shapes,
The left hemisphere portion 1A having the insertion hole 3 of the shaft pipe 2 and the right hemisphere portion 1B having the fitting projection 4 having the insertion hole 4A therein are formed respectively. After passing the end 2A or 2B through the insertion hole 3 of the left hemisphere 1A,
The shaft pipe 2 is inserted into the insertion hole 4A of the fitting protrusion 4 of the right hemisphere portion 1B.
Fit the ends (2A or 2B) of and fix with an adhesive,
After that, the left hemisphere portion 1A and the right hemisphere portion 1B were fitted into the opening edge portions 5A and 5B along the direction of the shaft pipe 2 to form one balance sphere.

However, when fitting both ends (2A, 2B) of the shaft pipe 2 to the fitting projection 4 of the right hemisphere 1B, the fitting projection 4
Since the length distance Δl of the end portion that fits into the insertion hole 4A is not reliably determined by the degree of press fitting, the fixed position of the shaft is not determined, and the balance ball 1 of the pair of left and right pendulums loses the balance. was there. Further, there is a drawback that an assembling jig separately provided for correcting the balance, a balance adjusting mechanism and the like are required, and the mounting work becomes complicated and the cost is increased.

(Technical problem) Therefore, the present invention has been made in view of the drawbacks of the prior art, and the balance sphere can be easily assembled to the shaft pipe without any other assembly jig or the like. The technical issue is to prevent the balance of the entire pendulum from being disturbed due to variations in assembly.

(Technical Means) In order to solve the above-mentioned technical problem, the present invention has through holes in the left and right ends of a C-ring shaped axial pipe functioning as a balance horizontal axis in a direction perpendicular to the axial direction in advance. After punching, press-fitting pins are lightly press-fitted into the through-holes to form a cross shape, and then a pair of hemispherical parts previously divided into two parts are fitted and clamped from the vertical direction at the top and bottom tips of the press-fitting pins. As a result, one balance sphere is assembled to the shaft pipe, and specifically, as shown in the drawings (FIGS. 1 to 4), it has the following configuration.

Reference numeral 10 is a main body of the CHARACTER watch, and a pair of balance balls (12A, 12B) are provided on both ends (12A, 12B) of a C-ring-shaped shaft pipe 12 which is a balance horizontal shaft via a fulcrum (not shown) on the case body 11. A pendulum body 14 to which the 13, 13) are attached is supported at a fulcrum point of the case body 11 like a "jijirobe" so that the pendulum can swing in the directions of arrows A to B.

The reciprocal swinging motion of the pendulum body 14 may optionally be forcedly oscillated by electromagnetic power linked to the timepiece mechanism, or may be performed by other mechanical operation.

The balance sphere 13 is divided into an upper hemispherical portion 13A and a lower hemispherical portion 13B, and the fitting projections 15 having the insertion holes 15A and 15B are divided into two parts, and the inner bottom portions of the upper hemispherical portion 13A and the lower hemispherical portion 13B are respectively formed. It is formed on.

16A is a hemispherical groove formed in a part of the opening edge portion 17A of the upper hemispherical portion 13A, 16B is a hemispherical groove formed in a part to face the hemispherical groove 16A of the opening edge portion 17B of the lower hemispherical portion 13B When the upper hemisphere portion 13A and the lower hemisphere portion 13B are fitted to each other through the opening edge portions (17A, 17B) to form one balance sphere 13, the tip portion 12A of the shaft pipe 12 is inserted. An insertion hole 16 for inserting is formed. Thus, the shaft pipes 12 are sandwiched between the upper hemisphere portion 13A and the lower hemisphere portion 13B by the insertion holes 16.

Reference numeral 18 is a press-fitting pin, and the press-fitting pin 18 is the tip portion 12A of the shaft pipe 12 and has a distance ΔL from the end along the axial direction.
At this point, it is lightly press-fitted into a through hole 19 formed in a direction perpendicular to the axial direction to form a substantially cross shape.

P is a spherical molding parting line that is perpendicular to the axial direction of the press-fitting pin 18, and is substantially on the same horizontal line as the axial direction of the axial pipe 12.

Thus, the upper end 18A of the press-fitting pin 18 is lightly press-fitted into the insertion hole 15A formed in the fitting projection 15 of the upper hemisphere 13A, and the fitting projection 15 of the lower hemisphere 13B is Insertion hole 1
The lower tip 18B of the press-fitting pin 18 is lightly press-fitted into the 5B, and at the same time, the opening edge 17A of the upper hemisphere 13A and the opening edge 17B of the lower hemisphere 13B are clamped from above and below the shaft pipe 12 respectively. By fitting them together, the balance balls (13, 13) are attached to both end portions (12A, 12B) of the shaft pipe 12.

At that time, the through hole is preliminarily formed at right angles to the axial direction of the axial pipe 12.
Balance sphere 13 if 19 is set to the distance ΔL from the end
Is completely fixed in a fixed position and the balance ball
13 may move along the axial pipe 12 while shifting,
Further, there is no possibility that the balance sphere 13 itself will rotate around the shaft pipe 12.

The present invention has a great feature in that it can be assembled only by fitting and forming without using an adhesive or the like for assembly, and can be disassembled into individual parts.

(Operation) The above technical means operates as follows.

First, the press-fitting pin 18 is press-fitted into the through hole 19 of the shaft pipe 12, and the upper end 18A of the press-fitting pin 18 is press-fitted into the insertion hole 15A of the fitting projection 15 of the upper hemisphere 13A, and the lower end 18B. Is press-fitted into the insertion hole 15B of the fitting projection 15 of the lower hemispherical portion 13B to sandwich the press-fitting pin 18 between the hemispherical portions (13A, 13B), and then the opening edge portions (17A, 17B) are attached to each other by the shaft. The pipe 12 is fitted so as to be sandwiched between the hemispherical grooves 16A and 16B.

Then, the balance ball 13 is attached to the shaft pipe 12 through the press-fitting pin 18.
Will be installed.

At that time, the press-fitting pin 18 causes the balance ball 13 to shift along the parting line P of the axial pipe 12,
The balance ball 13 does not rotate around the shaft pipe 12 as a rotation axis.

Further, the shaft pipe 12, the press-fitting pin 18, the upper hemisphere portion 13A, and the lower hemisphere portion 13B can be disassembled, and it is not necessary to use an adhesive or the like.

Thus, the pendulum body 14 is formed, and this may be attached to the operation fulcrum of the case body 11.

(Effect) Therefore, the present invention has the following unique effects.

(A) No adhesive or the like is required for assembly, and assembly and disassembly are easy.

(B) The balance sphere itself can be perfectly fixed at a predetermined position without rotating, and the entire pendulum can be automatically balanced without any balance adjustment.

(C) Since no assembly jig or the like is required, the cost can be reduced.

(D) The position of the ball forming parting line of the balance sphere can be fixed at a predetermined position, which is preferable in design.

[Brief description of drawings]

1 to 4 show the product of the present invention. FIG. 1 is an overall perspective view of a character timepiece main body, FIG. 2 is an overall perspective view of a pendulum main body, and FIG. 3 is a balance ball attached to a shaft pipe. FIG. 4 is a longitudinal sectional view showing a main part in the closed state, and FIG. 4 is an exploded perspective view showing the main part when the balance ball is attached to the shaft pipe. FIG. 5 shows the prior art. 13 …… Balance sphere, 13A …… Upper hemisphere 13B …… Lower hemisphere, 12 …… Shaft pipe 18 …… Press-fit pin

Claims (1)

[Scope of utility model registration request] 1. A pair of balance balls 13 are divided into an upper hemisphere portion 13A and a lower hemisphere portion 13B, respectively, and a shaft pipe 12 is provided.
A pair of press-fitting pins 18 are attached to both end portions (12A, 12B) of the shaft pipe 12 such that the axial direction of the shaft pipe 12 and the axial direction of the press-fitting pin 18 are orthogonal to each other, and the shaft pipe 12 is inserted through the press-fitting pins 18. Both tip parts (12A, 12B) of upper hemisphere 13A and lower hemisphere 13B respectively
Balance sphere mounting structure for pendulum designed to be sandwiched from above and below