JPS6221982Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the second hand presser spring structure, and particularly improves the ease of assembly.

The second hand presser spring is used to press the second hand shaft or the second hand wheel fixed to the second hand shaft with appropriate spring pressure in order to prevent the second hand blade from swinging improperly.

As a conventional second hand presser spring structure with good assembly workability, there is a known second hand presser spring structure in which a plate-shaped second hand presser spring is loosely fitted onto the second hand shaft, and the spring is brought into contact with the main plate and the second hand wheel. However, in this method,
Since the second hand presser spring was simply loosely fitted onto the second hand shaft, there was a problem in that it could easily come off if any vibration occurred when it was assembled into the main plate during assembly. This problem poses a particularly serious problem when automatically assembling a watch. For example, if a watch is assembled with the second hand presser spring removed, all of the pieces will be defective. A method was desired.

This invention was devised to solve the above-mentioned conventional problems, and its purpose is to improve workability by preventing the second hand presser spring from easily coming off from the second hand shaft during assembly work. .

In order to achieve the above object, the present invention provides a second hand presser spring structure in which a plate-shaped second hand presser spring is loosely fitted onto the second hand shaft, and the spring is brought into contact with the main plate and the second hand wheel. A hole that can be fitted loosely into the wheel and an elongated hole connected to the hole are provided, and the second hand shaft has a small diameter part into which the second hand presser spring can be loosely fitted, and a large diameter part larger than the hole on the insertion direction side of the second hand presser spring. The second hand presser spring is installed on the second hand shaft and then incorporated into the timepiece wheel train.

Hereinafter, the present invention will be explained in detail based on preferred embodiments.

FIG. 1 shows an exploded sectional view of a timepiece movement according to an embodiment of the present invention in a fully assembled state. A rotor 30, a fifth wheel 40, a second wheel 50, and a third wheel 6 as a train that constitutes an analog display clock.
0, minute hand wheel 70, date wheel 80, hour hand wheel 90 and correction wheel 100, upper plate 2, middle plate 4 and lower plate 6.
It is rotatably supported by. The upper plate 2 and lower plate 6 in this embodiment have side walls extending from their respective peripheries (not shown), and also function as a case.

The second hand presser spring 10 is arranged between the upper plate 2 and the second hand wheel 50, and as will be explained in detail later, presses the second hand shaft 20 against the middle plate 4 with appropriate spring pressure and is attached to the tip of the second hand shaft. This can prevent the second hand sword (not shown) from swinging incorrectly. The assembly work regarding the second hand presser spring 10 will be explained with reference to FIGS. 2, 3, and 4. FIGS. 2 and 3 show the state before the upper plate 2 is assembled, and is inserted into the second hand shaft 20. The second hand presser spring 10 is formed by pressing a metal spring material into the shape shown in FIG. It has a long hole 14. On the other hand, the second hand shaft 20 has a large diameter portion 24 formed at the end in the insertion direction of the second hand presser spring 10, that is, in the embodiment, the upper plate 2 side, and then a small diameter portion 22. There is. This small diameter portion 22 is set to have a slightly smaller diameter than the hole 12 of the second hand presser spring 10, so that when the spring 10 is inserted into the small diameter portion 22 position, it fits loosely. on the other hand,
The large diameter portion 24 is set to have a slightly larger diameter than the hole 12. The second hand presser spring 10 needs to be inserted through the large diameter section 24 and up to the small diameter section 22.
4, the diameter of the hole 12 can be expanded elastically. When the second hand presser spring 10 is inserted up to the small diameter portion 22 of the second hand shaft 20, the spring 10 is held by the second hand shaft 20. Therefore, by first inserting the second hand presser spring 10 into the second hand shaft 20 and then assembling the watch movement, it is possible to assemble the second hand wheel 50 (including the second hand shaft 20) into the middle plate 4. , second hand presser spring 1 due to vibrations generated when assembling the upper plate 2.
It is possible to prevent 0 deviation defects. When the upper plate 2 is completely assembled as shown in FIG. By elastically abutting each other, the second hand shaft 20 and the second hand wheel 50 can be pressed against the middle plate 4 with appropriate spring pressure.

In the embodiment, the second hand presser spring 10 is arranged between the upper plate 2 and the second hand wheel 50, but for example, it may be arranged between the second hand wheel 50 and the middle plate 4, and the second hand shaft 20 and the second hand wheel 50 are placed between the upper plate 2 and the second hand wheel 50. It is also possible to press the plate in two directions, and it has the same effect.

On the other hand, the upper plate 2 in the embodiment functions as a case and also as a dust cover, but in a structure in which, for example, the upper plate and dust cover are both provided independently, it is also possible to place the second hand presser spring 10 between the second hand wheel 50 and the dust cover, which will have the same effect.

As explained above, the present invention relates to the improvement of the second hand presser spring structure, and the second hand presser spring 10 has a second hand shaft 20.
A hole 12 and a long hole 14 connected to the hole 12 are formed, and the second hand shaft 20 has a small diameter portion 22 into which the second hand presser spring 10 is loosely fitted, and a small diameter portion 22 into which the second hand presser spring 10 is loosely fitted.
By forming the large diameter portion 24 on the insertion direction side of the second hand, the second hand presser spring 10 is held when inserted into the second hand shaft 20, making it possible to prevent unauthorized removal during assembly. It is something.

[Brief explanation of the drawing]

1 to 5 show a second hand presser spring structure as an embodiment of the present invention, and FIG. 1 is an exploded cross-sectional view showing the state after the timepiece movement is assembled. FIG. 2 is an enlarged sectional view of the main parts before the upper plate is assembled.
FIG. 3 is a plan view of FIG. 2. FIG. 4 is an enlarged sectional view of the main part after the upper plate is assembled. FIG. 5 is a perspective view of the second hand presser spring. 10... Second hand presser spring, 12... Hole, 14...
Long hole, 20...Second hand, 22...Small diameter section, 24...
Large diameter section, 50... second hand wheel.

Claims (1)

[Scope of utility model registration request] In the second hand presser spring structure in which a plate-shaped second hand presser spring is loosely fitted onto the second hand shaft and the spring is brought into contact with the main plate and the second hand wheel, the second hand presser spring has a hole that can be loosely fitted to the second hand shaft and a hole in which the second hand presser spring can be loosely fitted to the second hand shaft. A connecting elongated hole is provided, and the second hand shaft has a small diameter portion into which the second hand presser spring can be loosely fitted, and a large diameter portion larger than the hole on the side in the insertion direction of the second hand presser spring, and the second hand presser spring is attached to the second hand shaft. The second hand presser spring structure is characterized in that it is assembled into the watch wheel train after the second hand is fixed.