JPH0119197Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a drum for a ratchet-type music box that rotatably supports a plurality of ratchet wheels and plays a vibrating valve.

[Prior art]

Conventionally, the drum of this kind of ratchet-type music box has a synthetic resin input gear and a metal gear integrally molded on a metal shaft, as proposed by the present applicant in Japanese Utility Model Application Publication No. 58-23387. A stop sleeve is fitted, and a spacer is fitted to the outer periphery of this sleeve to hold the pawl freely rotatable.The tip of the metal shaft is knurled and a synthetic resin output gear is press-fitted, but the metal gear and Since integral molding of the metal shaft and input gear is troublesome and requires a large number of parts, rationalization is necessary.If the metal shaft is made of synthetic resin, molding will be easier and the number of parts can be eliminated, but it is the same as above. If the shaft and output gear were made of resin, the knurled press-fit would not work properly and it would not be possible to fix them securely, so a solution to this problem was needed.

[Purpose of invention]

The purpose of this invention is to propose a ratchet-type music box drum in which the center shaft and output gear are made of synthetic resin, and the number of parts is reduced by ensuring press-fit connection.

[Structure of the idea]

This invention integrates the input gear and the central shaft, press-fits the output gear into the tip of the central shaft, and uses a drum with multiple pawls supported between the input gear and the output gear so that they can rotate independently, and a pawl that faces the vibration valve. In the car music box,
The center shaft and the input gear are integrally molded from synthetic resin, a hollow hole with a non-circular cross section is formed at the tip of the center shaft, and a non-circular section with the same shape as the hollow hole is formed on one side of the output gear made of synthetic resin. In addition to providing a protruding shaft portion with a protruding shaft portion, an annular groove having approximately the same diameter as the outer diameter of the central shaft is formed surrounding the protruding shaft portion, a bearing portion is provided at the center of the other side of the output gear, and the tip of the central shaft is connected to the protruding shaft portion. , because it was press-fitted into the annular groove.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. In the ratchet type music box shown in Fig. 1, a barrel 10 with a full-scale internal structure, a diaphragm 2, and a wind regulating mechanism 3 are fixed on a frame 1, and a drum 4 rotated by a full-speed drive source is mounted on the frame 1. As shown in FIG. 2, the drum 4 is rotatably supported by a shaft, and a ratchet wheel 6 and a spacer 7 are alternately fitted to a drum center shaft 5, and an output gear 8 made of synthetic resin is press-fitted and fixed to the tip of the center shaft 5. The output gear 8 is configured to rotate a disc 9 with projections.

As shown in FIGS. 2 and 3, the drum center shaft 5 is integrally formed with an input gear 5a made of synthetic resin, and a metal gear 11 is integrally molded. A hollow hole 5b having a non-circular cross section is formed.

As shown in FIG. 4, the ratchet wheel 6 is formed of a metal material into an annular shape having a plurality of pawls 6a on its outer periphery.

As shown in FIGS. 2 and 5, the spacer 7 has a plurality of protrusions 7 spaced apart on one side of the metal annular disk.
A is formed by press working from the side surface side from which no projections protrude. The number of protrusions 7a is preferably three or more from the viewpoint of preventing inclination.

As shown in FIGS. 2 and 3, the output gear 8 has a toothed portion 8a on the outer periphery and a hollow hole 5 on the central shaft 5 on one side.
a protruding shaft portion 8c having a non-circular cross-section portion 8b having a hexagonal shape, for example, and a central shaft 5 surrounding the protruding shaft portion;
An annular groove 8d having approximately the same diameter as the outer diameter and a bearing part 8e are formed at the center of the other side surface and are integrally formed with synthetic resin.The bearing part 8e has a pivot shaft part 12 fixed to the frame 1. is inserted.

The disk 9 is formed with a tooth profile 9a that meshes with the tooth portion 8a of the output gear 8, and a large number of downward protrusions 9b that engage with the toe of the ratchet wheel 6 in accordance with the track.

When the ratchet type music box is configured as described above and is played, the entire drum is wound up, the drum 4 is rotated, and the output gear 8 rotates the disc 9, which corresponds to the protrusion 9b as shown in Fig. 4. When the pawl 6a of the ratchet wheel 6 is engaged and the ratchet wheel 6 is rotated one pitch, the diaphragm 2
The vibration valve 2a is flipped by the other toe of the ratchet wheel 6 corresponding to the vibration valve 2a.

When the ratchet type music box is configured as described above, the central shaft can be made of synthetic resin, and the input gear 5a and the metal gear 11 are integrally molded on the central shaft 5, and the ratchet wheel 6 and the spacer 7 are integrally formed. The number of parts is reduced because the central shaft 5 and the output gear 8 are fitted, and the non-circular section 8b of the protruding shaft portion 8c is press-fitted into the hollow hole 5b with a non-circular cross section, and the outer periphery of the central shaft 5 is connected to the output gear. Since it is press-fitted into the annular groove 8d of the gear 8, both are securely fixed to prevent rotation, and the force that causes the tip of the central shaft 5 to expand around the circumference due to the press-fitting of the protruding shaft portion 8c into the hollow hole 5b is applied to the annular groove 8d. Press-fitting the outer periphery of the tip prevents the tip from breaking. Furthermore, a bearing portion 8e on the other side of the output gear 8
Since the pivot shaft portion 12 is fitted into the pivot shaft portion 12, the output gear 8 will not be separated from the central shaft 5 after assembly.

The above-mentioned non-circular cross-sectional shape may be an occluded circle other than a hexagon.

The bearing portion 8e of the output gear 8 may have a convex shape instead of a concave shape.

In the above description, the drum 4 and the disc 9 are driven to rotate completely within the barrel 10 provided on the frame 1, but they may also be rotated manually. Alternatively, the frame 1 may be rotated while the disk 9 is kept stationary. Further, the disk 9 may be replaced with another member such as a belt with protrusions.

[Effect of idea]

Since the present invention is constructed as described above, the central shaft can be made of synthetic resin, the input gear and the metal gear can be integrally molded, reducing the number of parts, and the tip of the central shaft and the output gear are integrated with a secure press-fit connection. It is possible to provide a drum of a ratchet type music box which has excellent effects in practical use, such as being able to transform the central axis without breaking, and since the output gear is bearing on the back side, it does not come off the central axis.

[Brief explanation of the drawing]

The drawings show one embodiment of the drum of the ratchet-wheel type music box of the present invention, and FIG. 1 is a plan view of the ratchet-wheel type music box, FIG. 2 is a partially sectional side view of the drum of the ratchet-wheel type music box, and FIG. 3 is a side view of the drum of the ratchet-wheel type music box. 4 is an exploded sectional side view of the tip of the central shaft and the output gear, FIG. 4 is a sectional front view of the main part of the drum, and FIG. 5 is an A front view and a B sectional side view of the spacer. 2a... Vibration valve, 4... Drum, 5... Center shaft, 5a... Input gear, 5b... Hollow hole, 6...
Ratchet wheel, 8... Output gear, 8b... Non-circular section,
8c...Protruding shaft portion, 8d...Annular groove, 8e...Beared portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A vibration valve is a drum in which an input gear and a central shaft are integrated, an output gear is press-fitted to the tip of the central shaft, and a plurality of pawls are supported between the input gear and the output gear so as to be able to rotate independently. In the ratchet-type music box that faces each other, the central shaft and input gear are integrally molded from synthetic resin, a hollow hole with a non-circular cross section is formed at the tip of the central shaft, and a hollow hole with a non-circular cross section is formed at the tip of the central shaft, and a hollow hole with a non-circular cross section is formed on one side of the output gear made of synthetic resin. A protruding shaft portion having a non-circular cross section having the same shape as the hollow hole is provided, and an annular groove having approximately the same diameter as the outer diameter of the central shaft is formed surrounding the protruding shaft portion, and a bearing is provided at the center of the other side of the output gear. A ratchet-type music box drum with a central shaft tip press-fitted into a protruding shaft and an annular groove.