JPS5848875B2 - Clock with decorative rotating body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, in addition to the indicating device of a timepiece, a decorative rotating body that is visible from the outside has often been provided, and the present invention relates to an improvement in the structure thereof.

In a conventional timepiece of this type, the decorative rotating body 3 was directly mechanically connected to the movement 1, as shown in FIG.

Therefore, the larger the ornamental rotating body becomes, the more difficult it is to match its load with the movement, which has the disadvantage of causing mechanical failure and adversely affecting time accuracy.

The present invention aims to solve the above-mentioned drawbacks, and by adopting an indirect transmission method using the gap between magnets, it is possible to prevent the movement of the decorative rotary body from affecting the movement side. It is an object of the present invention to provide a clock that will not malfunction or lose its time even if an external force is applied to a rotating body due to touching it with a hand or the like.

1 and 2 show an embodiment of the present invention,
The configuration of the present invention will be described below with reference to FIG. 2. The output shaft 2 is taken out at an appropriate rotation speed from the gear train of a movement 1 equipped with a speed regulating mechanism such as a crystal oscillator, and the rotating shaft of the decorative rotating body 3. 4 are arranged concentrically, and ring-shaped magnets 5 and 6 magnetized into multiple poles along the circumference are attached to both the above-mentioned shafts 2 and 4.
The two magnets 5 and 6 are fixed to each other and are opposed to each other with a gap between them.

The torque setting of the output shaft 2 driven from the movement 1 side is determined by the magnets 5 and 6 when the decorative rotating body 3 side is stopped.
Make it larger than the torque in the opposite direction that acts when the two cross each other's magnetic field.

The timepiece having a decorative rotating body according to the present invention is constructed as described above, and since the movement 1 is equipped with a speed regulating mechanism separate from the decorative rotating body 3, it has poor accuracy like a conventional pendulum clock. The time accuracy is not affected by the pendulum, and a high-precision one such as a crystal can be used as the regulating mechanism, and the connection between the output shaft 2 from the movement 1 and the rotating shaft 4 of the decorative rotating body 3 is as follows. The output shaft 2 and the rotary shaft 4, which is a separate body from the output shaft 2, are arranged concentrically, and the end of the output shaft 2 and the end of the rotary shaft 4 are spaced apart, and magnets are respectively fixed to both shafts. 5 and 6 facing each other with a gap, even if the decorative rotating body 3 stops, the output shaft 2 continues to rotate in synchronization with the speed regulating mechanism, so the time accuracy is not affected. If the stopping conditions are removed, the rotating body 3 can be restarted without requiring a start, and the attraction force of the magnets 5 and 6 reduces the load on the bearing 7 of the rotating shaft 4, which has the effect of preventing wear. be.

Furthermore, since the output shaft 2 and the rotating shaft 4 are not mechanically connected, but only electromagnetically, the rotation from the output shaft 2 to the rotating shaft is transmitted only by the magnets 5 and 6. ,
It has less resistance than those with mechanical connections, and the rotation of the output shaft can be efficiently transmitted to the rotating shaft by magnets, and unlike those with mechanical connections, dust does not accumulate on the mechanical connection parts. There is no fear that the movement of the decorative rotating body will have an adverse effect on the movement if it sticks.

In addition, as mentioned above, the movement of the decorative rotating body does not affect the movement side, so the decorative effect can be achieved by increasing the size of the decorative rotating body or adding another movement to the decorative rotating body using a separate means. There are advantages that can be further enhanced.

Note that by magnetizing the magnets 5 and 6 into multiple poles along the circumference as in this embodiment, the rotation axis 4 relative to the output shaft 2 is
This increases the degree of freedom in the relative position of the rotating body, making it possible to restart the rotating body when an external force is applied to it, or to make smooth movements when turning the rotating body in other directions such as reverse rotation. .

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of a timepiece having a decorative rotating body according to the present invention, and Figure 1 is an external perspective view, and Figure 2 is a
The figure is an explanatory diagram of the main part, and FIG. 3 is an explanatory diagram of the main part of a conventional example. 1...Movement, 2...Output shaft,
3... Decorative rotating body, 4... Rotating shaft, 5
, 6... Magnet, 7... Bearing.

Claims (1)

[Claims] 1. An output shaft extending from a gear train of a movement equipped with a speed regulating mechanism and a rotating shaft separate from the output shaft are arranged concentrically, and the end of the output shaft and the end of the rotating shaft are spaced apart, A timepiece having a decorative rotating body, characterized in that ring-shaped magnets magnetized along the circumference are respectively fixed to both of the shafts, and the two magnets are opposed to each other with a gap between them.