JP2001242856A - Supporting structure of rotary ornamental body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting structure of a rotary ornamental body which is simple in constitution and is adapted to prevent the exertion of load on a drive source even when the load is exerted on the ornamental body. SOLUTION: A drive shaft 12 and a connecting shaft 14 are connected by loosely fitting a first fitting part 12a and a second fitting part 14a. The first fitting part 12a and the second fitting part 14a are loosely fitted in the inclined state of axial centers as the centroid of the connecting shaft 14 is decentered in the radial direction from the second fitting part 14a. Engaging parts 12c and 14c are engaged with each other by the inclination of the axial centers of the first fitting part 12a and second fitting part 14a. When the load is exerted on the connecting shaft 14, the engagement state by the engaging parts 12c and 14c is easily released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a decorative body which is rotationally driven by a drive source such as a music box, a motor, a clock mechanism, etc., and particularly to a structure for applying a load to the decorative body. The present invention relates to a configuration in which a load is not transmitted to a drive source.

[0002]

2. Description of the Related Art A decorative body which is driven to rotate by using a conventional music box, motor, clock mechanism or the like as a driving source is disclosed in
As disclosed in Japanese Patent No. 184595, an arm-shaped engaging body is engaged with a cam or the like that rotates together with a drum of a music box, and the decorative body is moved by swinging the engaging body.

[0003] In the above prior art, the decoration is driven almost directly by the driving source. Therefore, when the decoration hits a stationary object or is forcibly moved by an external force, the decoration is attached to the decoration at that time. Such a load is directly applied to the drive source, and the drive source may stop or be damaged.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 10-39052, the drive shaft which is rotated by the motor and the end surface where the support shaft for rotating the decorative body abuts are formed with irregularities which are engaged in the axial direction. There is also a rotary ornament which is provided with an engaging portion, and when a load is applied to the support shaft, the engaging portion is overridden so that the support shaft is pushed up by the rotation of the drive shaft, the engagement portion is disengaged, and no load is applied to the drive shaft. Was.

[0005]

As in the prior art described above, a load is applied to the drive shaft if the engagement between the support shaft and the drive shaft is released by releasing the support shaft supporting the decorative body in the axial direction. It is possible to prevent that. However, when an external force or load is applied from the axial direction of the support shaft, the support shaft cannot escape and the support shaft cannot be disengaged from the drive shaft, and a load is applied to the drive shaft. Become.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple configuration and a rotary decoration which does not apply a load to a driving source even when a load is applied in the rotational direction or the axial direction of the decorative body. It provides a body support structure.

[0007]

According to the present invention, there is provided a support structure for a rotary decorative body, a drive source, a drive shaft rotatably driven by the drive source and having a first fitting portion at an upper end, a decorative body, and the decorative body. A connection shaft having a body attached to an upper end and a lower end having a second fitting portion that loosely fits into the first fitting portion, and having a center of gravity at a position radially eccentric from the second fitting portion. One of the first fitting portion and the second fitting portion is formed of a tubular portion and the other is formed of a shaft portion, and is engaged with one or both of the tubular portion and the shaft portion in a rotational direction. A mating portion is provided, and the axis of the second fitting portion is tilted with respect to the axis of the first fitting portion in accordance with the position of the center of gravity of the connection shaft, so that the engaging portion forms the shaft portion or the tubular portion. The connection shaft rotates together with the drive shaft by engaging with the drive shaft.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In a supporting structure of a rotary decorative body according to the present invention, rotation from a drive source is transmitted to the decorative body by a drive shaft and a connecting shaft. The drive shaft and the connection shaft are connected by loosely fitting a first fitting portion provided at an upper end of the drive shaft and a second fitting portion provided at a lower end of the connection shaft. One of the first fitting portion and the second fitting portion is a tubular portion having a bottom, and the other is a shaft portion having a smaller diameter than the tubular portion and having a tip abutting on the bottom of the tubular portion. The center of gravity of the second
Since it is eccentric in the radial direction from the fitting portion, the axis of the shaft portion is inclined with respect to the axis of the tubular portion.

[0009] On one or both of the inner peripheral surface and the outer peripheral surface of the tubular portion and the shaft-like portion as described above, there is provided an engaging portion formed of a notch, a knurl or the like. The engagement portion engages with the inner surface of the tubular portion or the outer surface of the shaft portion by tilting the axis of the tubular portion and the shaft portion. When the engagement portion engages in the rotation direction, the rotation of the drive shaft causes the connection shaft to rotate. And the decoration rotates.

[0010] As described above, the drive shaft and the connecting shaft are engaged by the axis of the tubular portion and the shaft portion being inclined by the center of gravity of the connecting shaft including the decorative body. Therefore, when the decorative body hits a stationary object or an external force is applied to the connection shaft, the engagement state of the engagement portion is easily released, and the load applied to the connection shaft is prevented from being transmitted to the drive shaft as it is. Can be.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of a support structure for a rotary decorative body according to one embodiment of the present invention, FIG. 2 is an external perspective view of a music box-equipped watch using the support structure shown in FIG. 1, and FIGS. 2 is a front view and a side view showing the drive shaft and the drive source shown in FIG.
It is a side view which shows the connection shaft shown in FIG.

In FIG. 2, reference numeral 2 denotes a timepiece housing, a time display section 4 is provided on the front face thereof, and a slit-shaped sound hole 6 for emitting a sound from a music box described later is provided on a side face thereof. A movement 8 for driving the time display unit 4 and a music box unit 10 are housed inside the timepiece housing 2. In addition, a decoration 1 is provided above the clock housing 2.
6 are provided. In this embodiment, the ornament 16 is configured to rotate by transmitting the rotation of the music box of the music box unit 10 to the ornament 16 via the drive shaft 12 and the connecting shaft 14 as a drive source.

As shown in FIGS. 3 and 4, the music box unit 10 includes a music box 18, a resonance board 20 made of a wooden board to which the music box 18 is attached, and the resonance board 2.
Box-shaped resonance chamber 2 which is formed in part of
2 is provided. The music box 18 generates sound by playing a musical scale plate 18b provided on a substrate 18a with a projection provided on a peripheral surface of a drum 18d rotated by a motor 18c. Motor 1
8 c is an alarm signal from a reference mechanism provided in the movement 8 or the frame 2 fixed to the resonance plate 20.
4 operates in response to the operation of the monitor switch 26 provided on the upper side 4 for a certain period of time.

The drive shaft 12 is attached to a shaft of a drum 18 d in the music box 18, and is configured to protrude upward from a hole 2 a provided on the upper surface of the timepiece housing 2. The upper end of the drive shaft 12 has a first fitting portion 12a
Is provided. As shown in FIGS. 1 and 3, the first fitting portion 12a is formed of a tubular portion having a bottom, and has a cutout portion 12b formed in an axial direction from an upper end surface. Also,
The first fitting portion 12a is provided with a first engaging portion 12c formed of an edge of a cutout portion 12b slightly projecting inward.

As shown in FIGS. 2 and 5, the connecting shaft 14 is bent substantially in a crank shape, and the upper end of the connecting shaft 14 is
6, and a second fitting portion 14a is provided at the lower end. The outer diameter of the second fitting portion 14a is smaller than the inner diameter of the first fitting portion 12a of the drive shaft 12, and the first engagement portion 14a is brought into contact with the bottom portion 12d of the first fitting portion 12a. A second engaging portion 14c made of knurls with fine irregularities is provided at a position facing the joining portion 12c.

The drive shaft 12 and the connecting shaft 14 having the above construction
Are loosely fitted and connected as shown in FIG. That is, from the inner diameter of the first fitting portion 12a of the drive shaft 12,
Since the outer diameter of the second fitting portion 14a is smaller, the second fitting portion 14a is loosely fitted with play when inserted into the first fitting portion 12a. At this time, the position of the connecting shaft 14 in the axial direction is such that the distal end 14b is at the bottom 12 of the first fitting portion 12a.
The first engaging portion 12c and the second engaging portion 14c face each other at this time.

As described above, since the second fitting portion 14a is loosely fitted to the first fitting portion 12a, the second fitting portion 14a is provided with the second fitting portion for the play.
The fitting portion 14a is in a state capable of moving in the radial direction,
The axis 14e of the second fitting portion 14a is stabilized in a state where it is slightly inclined with respect to the axis 12e of the first fitting portion 12a. In particular, when the connecting shaft 14 is in the shape of a crank as in the present embodiment and the decorative body 16 is attached at a position off the axis of the second fitting portion 14a, the position of the center of gravity of the second fitting portion 14a becomes the second fitting position. The second fitting portion 14 is radially eccentric from the fitting portion 14a.
The axis 14e of a is easily inclined with respect to the axis 12e of the first fitting portion 12a.

As described above, the shaft center 14 of the second fitting portion 14a is
When e is inclined with respect to the axis 12e of the first fitting portion 12a, the second engaging portion 14c is pressed against the first engaging portion 12c facing at this time. Since the first engaging portion 12c and the second engaging portion 14c are formed of a set of sharp edge-shaped convex portions or knurled fine irregularities,
When it comes into contact, it will bite or generate a large friction in the rotation direction. By engaging in the rotation direction in this way, the rotation of the drive shaft 12 is transmitted to the connection shaft 14 and the decoration body 16 is rotated. Will be.

On the other hand, the first engaging portion 12c and the second engaging portion 14
The engagement state with c is only held by the inclination of the connecting shaft 14, and when an external force or a load is applied to the decorative body 16 and the degree of inclination of the connecting shaft 14 changes, the engagement is immediately released. The drive shaft 12 and the connection shaft 14 are separately rotatable. Therefore, the load applied to the connecting shaft 14 is
And the music box 18 as a drive source can be prevented from stopping or being damaged.

In the above embodiment, the first
The fitting portion 12a is formed of a tubular portion, and the second fitting portion 14a of the connecting shaft 14 is formed of a shaft-shaped portion.
The first fitting portion 12a is constituted by a shaft portion, and the second fitting portion 14a
May be constituted by a tubular portion.

In the above embodiment, the first engagement portion 12c and the second engagement portion 14a are respectively provided with the first engagement portion 12c.
And the second engaging portion 14c, but the first engaging portion 12c
Only one of the first and second engagement portions 14c may be provided.

[0022]

According to the present invention, the first fitting portion formed of a tubular portion or the like provided on the drive shaft and the second fitting portion formed of a shaft portion or the like provided on the connecting shaft are loosely fitted. Since the rotation of the drive shaft is transmitted to the connection shaft by providing the engagement portion engaged by the inclination of the axis in the first fitting portion and the second fitting portion, the external force and the load are rotated. When the inclination of the shaft center changes in the direction or in the axial direction, the engagement state between the drive shaft and the connection shaft is immediately released, and external force or load can be prevented from being transmitted from the drive shaft to the drive source.

Further, since other parts and a special connection structure are not required at the connection portion between the drive shaft and the connection shaft, the configuration is simple and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a support structure for a rotary decorative body according to an embodiment of the present invention.

2 is an external perspective view of a timepiece with a music box using the support structure shown in FIG. 1;

FIG. 3 is a front view showing a drive shaft and a drive source shown in FIG. 2;

FIG. 4 is a side view showing a drive shaft and a drive source shown in FIG. 2;

FIG. 5 is a side view showing a connection shaft and a decorative body shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Music box unit 12 Drive shaft 12a 1st fitting part 12c 1st engaging part 14 Connecting shaft 14a 2nd fitting part 14c 2nd engaging part 16 Decorative body 18 Music box

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A63H 29/00 A63H 29/00 B G04B 45/00 G04B 45/00 U

Claims (1)

[Claims] A drive shaft rotatably driven by the drive source and having a first fitting portion at an upper end; a decorative body; the decorative body attached to an upper end; and a first fitting portion at a lower end. And a connection shaft having a center of gravity at a position radially eccentric from the second fitting portion, the second fitting portion being loosely fitted to the first fitting portion and the second fitting portion. One is formed of a tubular portion and the other is formed of a shaft portion, and one or both of the tubular portion and the shaft portion are provided with an engaging portion that is engaged in a rotational direction, and the second portion is formed in accordance with the center of gravity of the connection shaft. When the axis of the second fitting portion is inclined with respect to the axis of the one fitting portion, the engaging portion engages with the shaft portion or the tubular portion, and the connection shaft rotates together with the drive shaft. A supporting structure for a rotating decorative body.