JPS589558A - Rotary for electronic clock - Google Patents

Abstract

PURPOSE:To reduce cost while thinning the rotor by separately forming a rotor core and a Japanese syllabary section and mounting a flange for fixing a rotor magnet at another end side of the Japanese syllabary incorporating section of the rotor core. CONSTITUTION:The rotor is provided with the rotor core 9, to which the flange 9b is formed integrally, the rotor magnet 1, which is positioned by the flange and inserted into the rotor core, and a rotor gear 10 fixing the rotor magnet between the gear and the flange, and the rotor gear 10 is molded integrally to the rotor core 9 through insertion molding after inserting the rotor magnet 1. Accordingly, the number of rotor forming parts can be reduced while a range which can be engaged with other transmitting wheels can be obtained instantaneously from the upper surface section of the rotor magnet, and the rotor can be thinned.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a rotor for an electronic timepiece.

In recent electronic watches, miniaturization and thinning have been successfully achieved, but there is an even stronger demand for smaller, smaller, and thinner watches, as well as the need to reduce costs.
The configuration of the conventional rotor for electronic watches is shown in Figures 1 and 2.
Although the structure shown in FIG. 1 and FIG. 3 is used, the structure shown in FIG. Although it is fixed, the number of parts is large and the magnet frame 2cL is placed between the rotor magnet 1 and the rotor pinion 30.
-1'l! Due to the large gap between the rotor pinion and the gear that meshes with the rotor pinion, it is difficult to make it thinner.In the structure in which the rotor magnet 1 shown in Fig. 2 is insert-molded with the plastic member 4, the number of parts is small. Similarly, it is difficult to make the wave thinner due to the plastic upper part 4a surrounding the magnet 1.Even if the rotor pinion 3 shown in FIG. 3 has a large side bearing surface of the rotor magnet 1 and the other end is fixed with the magnet frame 2b, example,
As in the example shown in FIG. 2, the meshing portion is kept away from the magnet 1, which prevents the device from becoming thinner.

In order to eliminate the above-mentioned drawbacks, the present invention makes the rotor core and pinion part separate, and provides a rotor magnet fixing flange on the other end of the rotor core's pinion assembly part, thereby reducing the cost and thickness of the watch. The aim is to achieve these goals at the same time.

The present invention will be explained in detail below based on the drawings.

FIG. 4 shows an embodiment of the present invention, in which reference numeral 5 denotes a base plate, and a bearing portion 5α is formed to pivotally support an axis 6α at one end of a rotor 6, which is a component of a motor block. Stator hole 7α of one component of the motor block
The rotor 6 has one end shaft supported by the main plate 5 and the other end shaft center 6bf, which is supported by the gear train bearing member 8. The other end side of the holding flange portion 9cL of the rotor core 9 is fixed by a rotor pinion portion 10 formed by insert molding a plastic member after the rotor magnet 1 is inserted into the rotor core 9. The transmission wheel 11 that transmits the driving force from the rotor to the pointer shaft is designed to ensure a minimum clearance between the rotor magnet 1 and the mutual component tolerance absorption amount.
1 is placed.

As described above, the pinion part of the rotor pinion side that meshes with another transmission wheel of the rotor of the electronic watch motor is molded from a plastic member, and the rotor magnet is held by the flange part of the rotor core at the other end. In addition, it is possible to reduce costs by reducing the number of rotor component parts and the rotor manufacturing process, and also to make it possible to immediately mesh with other transmission wheels from the top surface of the rotor magnet. It has the effect of reducing the cost as well as making it thinner.

[Brief explanation of drawings]

1, 2, and 3 are cross-sectional views showing the structure of a conventional rotor, and FIG. 4 is a cross-sectional view showing the rotor portion of the present invention. 1. Rotor magnet 2. . Magnet frame 31. Rota kana 5. . Base plate 6°, rotor 70. Stator 800 gear train support member 90. rotor core

Claims (1)

[Claims] A rotor of a watch motor comprising a rotor core integrally formed with a flange and a rotor gear positioned by the seven flange, a rotor magnet inserted into the rotor core, and a rotor gear fixed between the rotor magnet and the seven flange, the rotor gear A rotor for an electronic watch, characterized in that it is integrally formed with a rotor core by insert molding after inserting a rotor magnet.