JPS62169075A - Time-piece - Google Patents

Abstract

PURPOSE:To obtain a time-piece with a two main plate structure and a low power consumption by pivotally supporting one end of a second hand shaft by an upper main plate and holding a pointer pipe coaxially fitted to the second hand shaft by a lower main plate. CONSTITUTION:The bottom end of the second hand shaft 5a of a second hand wheel 5 is pivotally supported by an upper main plate 1. The minute hand pipe 6A of a minute hand wheel 6 is rotatably fitted to the second hand shaft 5a and the hour hand pipe 7A of an hour hand wheel 7 is rotatably fitted to the minute hand pipe 6A. The engaging projection 7b of the hour hand pipe 7A engages the upper end surface of the engaging portion 2A of a lower main plate 2 and regulates the displacement of the hour wheel 7 in an axial direction together with the engagement between the upper surface of the hour wheel 7 and the lower end surface of the engaging portion 2A. Similarly, the engaging projection 6a of the minute hand pipe 6A, engaging the engaging portion 7c of the hour hand pipe 7A, regulates the displacement of the minute hand wheel 6 in an axial direction. Therefore, since the load of the minute hand wheel 6 and the hour hand wheel 7 is wholly applied to the lower main plate 2 and is not applied to the second hand wheel 5, the output of a driving motor 3 can be small even for a two main plate structure.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an analog timepiece.

(Prior art) As is well known, the second hand shaft of the second hand wheel has a pair of pointer pipes such as a minute hand pipe and an hour hand pipe, and when a watch is configured with two main plates (upper and lower), the second hand shaft has a minute hand pipe, an hour hand pipe, etc. The load of the hour hand wheel, etc. will be directly applied to it.

As a result, the second hand wheel, which has a weak output torque, becomes unstable and sometimes stops.

For this reason, conventional measures have been taken to increase the output of the watch's drive motor, or to purchase a three-piece main plate by installing a middle plate to prevent the load of the pointer wheel from being applied to the second hand wheel, thereby reducing current consumption. That is the reality.

(Problems to be Solved by the Invention) However, increasing the output of the drive motor requires an additional amount of current consumption, and the structure of the three-plate base plate becomes complicated accordingly, making the assembly work complicated.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a timepiece that has a two-piece base plate structure and can also reduce current consumption.

(Means for Solving Problems) A feature of the present invention is that the watch wheel train is rotatably supported by two main plates (upper and lower), and the second hand wheel is free from loads from other pointer pipes. This is where I tried to avoid it. The configuration is such that one end of the second hand shaft of the second hand wheel is pivotally supported by the upper base plate, and pointer pipes such as an indicator pipe, an hour hand pipe, and a minute hand pipe are coaxially and rotatably connected to the second hand shaft. At the same time, these pointer pipes are successively held by the base plate.

Specifically, the pointer pipe located at the outermost periphery of the pointer pipes, such as the guide pipe and the hour hand pipe, is connected to the pointer pipe by the locking part provided on the base plate. The inner pointer pipe is rotatably held with its movement in the axial direction restricted, and the inner pointer pipe is provided with a locking protrusion on its outer periphery, which is engaged with the locking portion IL of the adjacent outer pointer pipe. By stopping the inner pointer pipe, movement in the axial direction is restricted.

(Function) Since the present invention has the above configuration, the locking protrusion of the outermost pointer pipe, for example, the hour hand pipe, locks into the locking portion of the base plate and is rotatable and movable in the axial direction. Furthermore, the inner pointer pipe is supported by the outer pointer pipe in a rotatable and axially restricted manner, so that all the load of the pointer pipe is applied to the base plate and is not applied to the second hand wheel. It doesn't hang at all.

(Example) Examples of the present invention will be described below based on the drawings.

As shown in the first diagram, the wheel train of the watch is rotatably supported between two base plates, an upper base plate 1 and a base plate 2. A rotor 3 of a clock drive motor and an intermediate wheel 4 for transmitting the rotational driving force of the rotor are supported on the main plate, and this intermediate wheel rotationally drives a second hand wheel 5. The lower end of the second hand shaft 5A of the second hand wheel 5 is pivotally supported by the upper base plate 1, and the minute hand shaft 5A is attached to this shaft portion.
A minute hand pipe A is rotatably fitted therein, and an hour hand pipe 7A of the hour hand wheel 7 is fitted into this minute hand pipe. The hour hand pipe 7A is rotatably held by the base plate 2. The fitting state of the pointer pipe A, 7A and the second hand shaft 5A, the holding state of the hour hand pipe 7A by the base plate 2, and the pointer pipe A, ? The mutually fitted state of A will be explained in detail later.

The second hand wheel 5 rotationally drives the minute hand wheel 6 via an intermediate wheel 8 that is pivotally supported by both base plates 1 and 2, and the minute hand wheel rotationally drives the hour hand wheel 7 via a back wheel 9. It is something to do. A second hand 10 is press-fitted into the tip of the second hand shaft 5A, a minute hand 11 is press-fitted into the tip of the minute hand pipe 7A, and an hour hand 12 is press-fitted into the tip of the hour hand pipe 7A. and the front cover 14 to display the time. Also, the back side of the upper base plate 1 (lower part in Figure 1)
A back cover 15 is located there.

By the way, the state in which the hour hand wheel 7 is held by the base plate 2 is as follows.

A locking portion 2A is protruded from the edge of the pointer through hole of the base plate 2, and the structure of the hour hand pipe 7A of the hour wheel 7 held by this locking portion is as shown in Fig. 2.3. As shown, elastic arms 7a are integrally formed at equal angular intervals, and locking protrusions 7b protrude from the tips of the elastic arms. Of course, if the hour hand pipe 7A itself is elastic, the locking protrusion 7b does not necessarily need to be formed into an elastic arm, and may be formed as shown in the fourth figure. Therefore, the locking protrusion 7b of the hour wheel 7 locks on the upper end surface of the locking portion 2A of the base plate 2, and the load of this hour wheel is applied to the base plate. Since the upper surfaces are close to each other, the hour hand wheel is fitted in a rotatable but immovable manner in the axial direction. Therefore, the entire load of the hour hand wheel 7 is applied to the base plate 2.

Next, the fitting state of the pointer pipes A and 7A will be explained. A locking protrusion 6a is also formed on the minute hand pipe A of the minute hand wheel 6, and this specific structure substantially corresponds to the hour hand pipe 7.
It is the same as the locking protrusion 7b of A. And minute hand pipero A
The locking protrusion 6a engages with a locking portion 7c protruding from the inner wall of the hour hand pipe 7A. Further, the upper surface of the minute hand pinion 16 that meshes with the hour hand wheel 9 is provided in close proximity to the hour hand wheel 7, so that the minute hand pipe can freely rotate within the hour hand pipe 7A and its movement in the axial direction is restricted. When fitted, the load of the minute hand wheel 6 is applied to the hour hand wheel 7. Therefore, all the loads of the hour hand wheel 79 and the minute hand wheel 6 are received by the base plate 2.

In addition, the second hand wheel 5 is held by the minute wheel 6 (1"). The bearing part 6B protruding from the inner wall of the minute hand pipe A bears the small diameter part of the second hand shaft 5a, and the stepped part 5b
By engaging with this bearing portion 6B, the second hand shaft 5A is prevented from coming off upward in FIG. Due to the above-described configuration, the second hand wheel 5 is not subjected to any load from the minute hand wheel 61 and the hour hand wheel 7.

Next, the assembling work of the timepiece according to the present invention will be explained.

Using the base plate 2 as a reference, the locking protrusion 7b of the hour hand wheel 7 is locked to the locking portion 2A of the base plate by deformation of the elastic arm 7a. In the same manner, the minute hand wheel 6 is inserted into the hour hand wheel 7, and the rotor 3, intermediate wheel 4, minute wheel 9, and intermediate wheel 8 are each supported on the base plate 2, and the minute hand pipe A of the minute hand wheel 6 is inserted. The second hand shaft 5A of the second hand wheel 5 is inserted into the second hand wheel 5, and the upper base plate 1 is attached.

(Effects of the Invention) As described above, the present invention can have a two-piece main plate structure, which makes the assembly work of the watch more efficient.Also, since no load is applied to the second hand wheel from other pointer shafts, it It is not necessary to increase the output of the drive motor as in the case of the above, and therefore it is effective in terms of low current consumption.

[Brief explanation of drawings]

Fig. 1 is a sectional view, Fig. 2 is a front view of the hour hand wheel, Fig. 3 is a partially cutaway plan view of the hour hand wheel, and Fig. 4 is a partially omitted front view showing another embodiment of the hour hand wheel. . DESCRIPTION OF SYMBOLS 1... Upper plate, 2... Base plate, 2A... Locking part, 5... Second hand wheel, 5A... Second hand shaft, 6A... Minute hand pipe, 6a... Locking projection , 7A... Hour hand pipe, 7a... Elastic arm, 7b... Locking protrusion, 7c... Locking portion. Figure 1

Claims (1)

[Claims] 1. A timepiece wheel train is rotatably supported between two upper and lower base plates, and one end of a shaft portion of a second hand wheel in the timepiece train is pivotally supported on the upper base plate. A plurality of pointer pipes are coaxially and rotatably fitted into the second hand shaft of the second hand wheel, and the outermost pointer pipe among the pointer pipes is provided with a locking protrusion. is held rotatably with axial movement restricted by being locked to the locking part provided on the base plate, and the inner pointer pipe has a locking protrusion on its outer periphery. ,
By locking this locking protrusion to a locking portion provided on the adjacent outer pointer pipe, the inner pointer pipe can rotate freely while its axial movement is restricted by the adjacent outer pointer pipe. A watch characterized by being supported. 2. The timepiece according to claim 1, wherein the locking protrusion of the pointer pipe is provided at the tip of an elastic arm integrally formed with the pointer pipe.