JPH0736313Y2 - Rotating ornament drive - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary ornament drive device used in, for example, a table clock with a rotary ornament.

[0002]

2. Description of the Related Art A table clock with a rotary ornament is popular as a clock with a high decorativeness. The rotary ornament used here is mounted on a rotary shaft that is erected from a case containing a drive mechanism and rotates horizontally. As a first example of a mechanism for reciprocally rotating an ornament, as a first example, Jitsuko Sho 61-48
As disclosed in No. 64, there is a drive system including a balance spring, a coil and a drive magnet.
As a second example, instead of using a balance spring,
There is also one configured using a forward / reverse rotation motor.

[0003]

Among the above-mentioned prior arts, in the case where the rotary ornament is rotated by using the balance spring of the first example, an elegant movement can be obtained in the rotary ornament. The spring constant has to be set to correspond to the mass and rotation angle of the rotary ornament and the cycle of reciprocating rotation, which is a troublesome design and manufacturing, and also has the disadvantage of increasing the cost of parts. Further, since the balance mechanism used as the drive source is arranged so that a plurality of permanent magnets and coils are alternately stacked at a predetermined interval, the thickness of the drive device becomes large, and there are restrictions on the design of the table clock with rotary decoration. Given.

In the second example, in which the rotary ornament is rotated by using the forward / reverse rotation motor, unlike the first example, there is an advantage that a balance spring is not used. A permanent magnet is fixed to the rotary shaft to which the decoration is attached, and a fixed magnet facing the permanent magnet repels the permanent magnet on the rotary shaft side, and the decoration is levitated by the magnetic force. Therefore, when the ornament is attached to the rotary shaft or when the ornament is touched by mistake, the rotary shaft may move up and down.

Therefore, of the train wheel for driving the rotary shaft, the drive gear which the rotary shaft penetrates and is coaxial with the rotary shaft or the transmission gear which meshes with the drive gear is
In consideration of the movement of the rotary shaft in the axial direction, the tooth width must be designed with a margin, and as a result, the thickness of the gear increases and the overall thickness of the drive device increases. Furthermore, it is not preferable in terms of transmission efficiency that one of the two meshing gears moves in the rotation axis direction.

The present invention has been proposed in view of the above-mentioned drawbacks, and is a thin rotary ornament drive device in which the tooth width in the meshing portion of the drive gear and the transmission gear for driving the rotary shaft having the ornament is minimized. The purpose is to obtain the device at a low cost with a simple configuration.

[0007]

In order to achieve the above-mentioned object, a drive device for a rotary ornament according to the present invention has a permanent magnet mounted on a rotary shaft which is rotatably supported along the direction of gravity and has a ornament at one end. The fixed and fixedly mounted fixed magnet opposes and repels the permanent magnet on the rotary shaft side, and transmits the rotary drive force from the drive gear and the drive source through which the rotary shaft penetrates. It is characterized in that it is meshed with the transmission gear, and the rotary shaft is fitted to the drive gear so as to be axially movable but relatively non-rotatable.

[0008]

The drive gear and the rotary shaft rotate as a unit, but even if the rotary shaft moves in the axial direction, the drive gear does not move following this.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an upper case 1 and a lower plate 2
Are connected to each other to form a box, and a drive device for the rotary decoration is built in the box.

The rotating shaft 5 is rotatably supported by the bearing 3a fixed inside the cup 3 provided on the upper case 1 and the cup 4 provided on the lower plate 2 along its axial direction. Has been done. The rotating shaft 5 projects from the upper case 1 and a decoration 6 is attached to the upper end thereof.

A doughnut-shaped permanent magnet 7 is fixedly provided in the cup 3 on the upper case 1 side. Hereinafter, this magnet is referred to as a fixed magnet 7. The fixed magnet 7 faces the donut-shaped permanent magnet 8 fixed to the rotary shaft 5 side through a bush 8a. The opposing surfaces of the two magnets 7 and 8 have the same polarity and repel each other, and the ornament 6 is levitated by the magnetic repulsive force. A nut 9 is attached to the lower end of the rotary shaft 5 to prevent it from coming off.

Inside the box body composed of the upper case 1 and the lower plate 2, a forward / reverse rotation motor as a drive source composed of a stator 10 and a rotor 11 is provided upright. The intermediate gear 12, the transmission gear 13, and the drive gear 14 penetrating the rotary shaft 5 are sequentially meshed with a rotor cana 11a which is integral with the rotor 11, and the rotational force of the reciprocating rotation of the motor is transmitted to the ornament 6. Form a train wheel for. The transmission gear 13 is divided into upper and lower parts via a coil spring 15, and constitutes a slip mechanism for cutting off the rotation generated when an excessive rotational force is applied to the decoration 6 from the outside.

The drive gear 14 through which the rotary shaft 5 penetrates is loosely fitted in the cup 4 provided on the lower plate 2, and a viscous resistance (such as grease) between the inner surface of the cup 4 and the drive gear 14 ( (Not shown) is satisfied. Due to this viscous resistance,
The movement of the drive gear 14 is made smooth. Here, the rotary shaft 5 is movable in the axial direction with respect to the drive gear 14, but is relatively non-rotatably fitted to the drive gear 14, and its configuration will be described below.

As shown in FIGS. 2 and 3, the radial cross-sectional shape of the portion of the rotary shaft 5 which engages with the drive gear 14 is a non-circular shape in which a part of a circle is cut away. . Therefore, the rotary shaft 5 rotates integrally with the drive gear 14, but is movable in the axial direction. As described above, the axial length of the portion of the rotary shaft 5 having a non-circular radial cross-section is set to be larger than the axial thickness of the drive gear 14 in consideration of the axial movement amount of the rotary shaft 5 itself. There is. The tooth width of the tooth portion 13a of the transmission gear 13 that meshes with the drive gear 14 is a.

Here, the decoration 6 is attached to the rotary shaft 5, or the decoration 6 is touched by mistake, and the rotary shaft 5 is rotated.
Suppose that moves along its axis. As shown in FIG. 4, it is assumed that the force in the arrow direction is applied from the outside and the rotating shaft 5 is lowered by the length b. At this time, the rotating shaft 5 is the drive gear 1
Similarly, the drive gear 14 does not move in the same manner as the length b, but the drive gear 14 and the transmission gear 13 are not affected.

If the drive gear 14 is fixed to the rotary shaft 5, the drive gear also moves as the rotary shaft 5 moves in the axial direction, so that the transmission gear 13 meshes with the drive gear 14.
The tooth width a (FIG. 2) of the tooth portion 13a must be large, but according to the configuration of the present invention, the tooth width a described above may be the minimum necessary.

In this embodiment, as shown in FIG. 3, the radial cross-sectional shape of the portion of the rotary shaft 5 that engages with the drive gear 14 is a non-circular shape in which a part of a circle is cut away. However, the present invention is not limited to this, and various configurations are conceivable, such as a configuration in which the portion of the rotary shaft 5 that engages with the drive gear 14 is an eccentric cylinder.

[0019]

As described above, according to the rotary ornament drive device of the present invention, the rotary shaft to which the ornament is attached can move in the axial direction of the drive gear, but cannot rotate relatively. Since they are fitted, even if a decoration is attached to the rotary shaft or the decoration is accidentally touched and the rotary shaft moves in the axial direction, the drive gear does not move following it. The tooth width of the meshing portion of the transmission gear with the drive gear can be reduced, and the entire device can be made thin.

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part showing an operating state.

[Explanation of symbols]

 5 rotating shaft 6 decoration 7 fixed magnet 8 permanent magnet 13 transmission gear 14 drive gear

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft that is rotatably supported along the direction of gravity and has a decoration at one end, a permanent magnet fixed to the rotary shaft, and a permanent magnet that faces the permanent magnet and repels it. A fixed magnet that is fixedly provided by being loosely fitted to the rotating shaft; and a drive gear that penetrates the rotating shaft and meshes with a transmission gear that transmits the rotational driving force from the drive source. A drive device for a rotary ornament, which is fitted in the drive gear so as to be axially movable but relatively non-rotatable.