JP2759758B2 - Movable ornament drive for mechanism clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable ornament driving device for a timepiece.

[0002]

2. Description of the Related Art In a conventional timepiece, when a movable ornament is supported so as to be reciprocally movable, a guide pin on a back surface of the movable ornament may be fitted into a guide groove of a main body frame.
At this time, when assembling, the guide pin is aligned with the guide groove, and the main body frame is turned upside down in that state, and a stopper for the movable decoration is provided at the tip of the guide pin via a screw or the like.

[0003]

For this reason, assembly is troublesome. In particular, when the movable ornament is removed for maintenance or the like, the movable ornament is stopped after not only removing the front cover but also removing the back cover. The screw had to be removed. SUMMARY OF THE INVENTION It is an object of the present invention to provide a movable ornament driving device that can easily attach and detach a movable ornament from the front side of a main body frame.

[0004]

According to the present invention, a guide pin is provided on a back surface of a decoration, and the guide pin is slidable in a guide groove provided in a main body frame. Mated. The guide groove includes a first groove in which the guide pin can slide, and a wide second groove in which the guide pin can be inserted and removed at a position beyond the swing range of the guide pin. The guide pin is provided at its tip with a retaining projection having a diameter larger than the width of the first groove and smaller than the width of the second groove.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1, 2, and 3, a movable ornament 2 made of plastic or the like is provided on a main body frame 1. The movable ornament 2 comprises a circular rotary ornament 4, a connecting rod 5, and a swing ornament 7 in the form of a clown. As shown in FIG. 1, the motor shaft 3 is
Are provided to pass through. The motor shaft 3 has a rotating decoration 4
Is press-fitted into a central shaft 41 provided on the back surface of the main body. As shown clearly in FIG. 2, an eccentric cam 42 having a shape close to a circle is provided on the back surface of the rotary decoration 4.

The eccentric cam 42 has one end of the connecting rod 5 (FIG. 2).
(Lower side in the drawing) is rotatably fitted with a cylindrical section 5a having a circular cross section. The other end (upper side in FIG. 2) of the connecting rod 5 is rotatably connected to a swing decoration 7 by a pin 6. Therefore, when the rotary ornament 4 rotates, the eccentric cam 4
2 rotates eccentrically, and the swinging decoration 7 reciprocates linearly via the connecting rod 5 (see FIG. 3). The eccentric cam 42 has a tapered shape close to a circle, and is provided on the inner peripheral surface of the cylindrical portion 5a.
The three portions 2a, 42b, and 42c are in contact with each other, and the other portions have gaps on the inner peripheral surface of the cylindrical portion 5a. For this reason, the sliding friction between the eccentric cam 42 and the cylindrical portion 5a is reduced, and the load on a drive system such as a motor can be reduced.

[0007] As shown in FIGS.
A boss 7a into which the pin 6 is press-fitted near the center of the back surface.
Is provided. Further, three bosses 7 b are provided on the back surface of the swing decoration 7, and a guide pin 8 is fixed to a tip of the boss 7 b with a screw 9. The guide pin 8 is formed as one member by a connecting portion 8a to facilitate assembly. A locking portion 8a for locking to the boss 7b is provided at one end (left side in FIG. 1) of the guide pin 8, and a retaining projection 8b (see FIG. 2) is provided at the other end.

As shown in FIG. 4, the body frame 1 is provided with a guide groove 10 for guiding the guide pin 8. The guide groove 10 includes a narrow first groove 10a and a wide second groove 10b connected to one end of the first groove. The first groove portion 10a allows the guide pin 8 to slide freely, has a smaller diameter than the locking portion 8a and the retaining projection 8b, and has a length sufficient to cover the moving range of the guide pin 8. have. The second groove 10b has a larger diameter than the retaining projection 8b.

The connecting portion 8a of the guide pin 8 has two protrusions 8c.
And a projection 5b near the cylindrical portion 5a and the pin 6 of the connecting rod 5.
Are provided one by one (see FIG. 2). The projection 8c and the projection 5b are slidable with the rail 11 provided at a relative position of the main body frame 1. When the projection 8c and the projection 5b slide on the rail 11, the swing decoration 7
Is prevented, and the body frame 1 and the swinging decoration 7 are hit and both are prevented from being damaged. Since the rail 11 covers the swing range of the projections 8c and 5b, the one near the guide groove 10 is linear and the one near the motor shaft 3 is circular.

Next, the assembling operation will be described. First, the connecting rod 5 is attached to the boss 7a provided on the back surface of the swing decoration 7.
Are connected by a pin 6. Next, the guide pin 8 is fixed to the boss 7a with the screw 9. In this state, the guide pin 8 is aligned with the wide second groove 10b. Since the second groove 10b is wider than the guide pin 8, the guide pin 8 can be easily inserted. Thereafter, when the swing decoration 7 is moved to the narrow first groove portion side, the guide pin 8 enters the first groove portion. Locking part 8
The swing ornament 7 is slidably fitted in the guide groove 10 because the diameter of the protrusion a and the retaining protrusion 8b is larger than that of the first groove. Thereafter, the eccentric cam 42 of the rotary decoration 4 is fitted to the cylindrical portion 5a,
The center shaft 41 is pressed into the motor shaft 3. At this time, since the second groove 10b is located at a position beyond the swing range of the eccentric cam 42, the swing decoration 7 does not fall out of the guide groove 10.

When the swing ornament 7 is removed, the rotary ornament 4 that has restricted the swing range of the swing ornament 7 is moved to the motor shaft 3.
And remove the guide pin 8 of the swinging ornament 7 from the second groove 10b.
The swing decoration 7 can be easily removed by moving the swing decoration 7.

Next, the operation will be described. When the rotational driving force from the drive source is transmitted to the rotary ornament 4, the rotary ornament 4 rotates in one direction. The eccentric cam 42 provided on the back surface of the rotary decoration 4 rotates eccentrically, and drives the swing decoration 7 via the connecting rod 5. At this time, the guide pin 8 provided on the back surface of the swing decoration 7 slides along the guide groove 10, and the swing decoration 7 reciprocates straight in a stable state. The swing range of the eccentric cam 42 is the first groove 10a of the guide groove 10.
Are sufficiently covered, so that the swinging ornament 7 does not come off the guide groove 10 when the swinging ornament 7 swings.

In the present embodiment, the boss 7b and the guide pin 8 are provided as separate members, but they may be provided as a single member on the swing decoration 7. At this time, the fixing member 9 such as a screw is not particularly required. Further, although three guide pins 8 are provided, the number is not limited to this, and at least one guide pin 8 is sufficient.

[0014]

According to the structure of the present invention, the swinging ornament can be mounted from the front side without turning over the main body frame or removing the back cover. In addition, this eliminates the need for a member such as a swing decoration holder. As a result, assembly becomes easier.

[Brief description of the drawings]

FIG. 1 is a sectional view of a movable ornament according to the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a front view of the present invention provided on the body frame side.

[Explanation of symbols]

 3 Rotating shaft 4 Rotating decoration 42 Eccentric cam 5 Connecting rod 7 Swing decoration 8 Guide pin 8b Retaining projection 10 Guide groove 10a First groove 10b Second groove

Claims (1)

(57) [Claims] 1. A swing ornament is disposed outside a rotary ornament, and the rotary ornament is connected to a rotating shaft to which a rotational driving force from a driving source is transmitted at a center of rotation. An eccentric cam is provided on the back of the decoration, and one end of a connecting rod is rotatably fitted to the eccentric cam, and the other end of the connecting rod is rotatably connected to the swinging decoration. A guide pin is provided on the back surface of the swing decoration, and the guide pin is slidably fitted in a guide groove provided in the main body frame. A first groove in which the pin can slide, and a wide second groove in which the guide pin can be inserted and removed at a position beyond the swing range of the guide pin; The diameter of the retaining groove is larger than the width of the first groove and smaller than the width of the second groove. Movable decoration driving device automaton clock, characterized in that force is provided.