JPH0355998Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a music box that stops the rotation of a drum through engagement between an engaging portion of a stopper and a hole in the drum.

[Prior art]

Conventionally, in a music box in which the rotation of the drum is stopped with a stopper so that the music box always starts playing from the beginning of the song, a hole 8 is installed in the end plate of the drum or in the eccentric position of the gear 7 that rotates integrally with the drum, as shown in Fig. 5. The engaging portion 11 of the stopper 10 is dropped into this hole and stopped. This engaging part 1
If both ends a and b of 1 are formed with end faces parallel to the hole, when the positions of the engaging part 11 and the hole 8 match, the engaging part will suddenly fall into the hole from the end face of the hole edge. There is a drawback that an impact noise is generated when the hole edge and the stopper come into contact with each other.

In a high-quality music box that is made with precision, it is necessary to prevent the generation of noise as much as possible, and with the conventional structure mentioned above, the generation of impact noise is unavoidable, and the impact noise is generated during playback, which has the disadvantage of impairing the sense of pitch that allows you to enjoy the melody. There is.

[Purpose of invention]

In view of the above-mentioned drawbacks, the present invention proposes a music box in which the engagement part of the stopper does not drop suddenly into the hole, thereby preventing the generation of impact noise.

[Structure of the idea]

The present invention includes a drum, a diaphragm that is repelled by a pin provided on the drum, a governor that rotates the drum at a constant speed, and an end plate of the drum or an eccentric position of a gear that rotates integrally with the drum. a stopper having a hole provided therein, a protrusion that is slidably supported and faces the rotation range of the speed governor, and an engaging portion that falls into the hole; and a spring that biases the stopper; The depressed side of the engaging part and the end face on the forward side in the rotational direction of the end plate or the gear is a slope, and the engaging part of the stopper is urged by the spring toward the end plate or the gear. The protruding piece is urged in a direction substantially perpendicular to the urging direction and out of the rotation range.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. In the music box, as shown in Figures 1 and 2, the entire drum inside the barrel 2 fixed on the frame 1 is wound up by the drum shaft 3, and the drum 4 is rotated at a constant speed by the speed governor 5 using this drum driving source. The music box is played by playing the diaphragm 6 with the pin of the drum.

A hole 8 is bored in the end plate of the drum 4 or at an eccentric position of the gear 7 that rotates integrally with the drum, and the frame 1
A stopper 10 is supported by a pin 9 so as to be slidable back and forth and rotated freely, and the stopper 10 is formed with an engaging portion 11 that falls into the hole 8 and faces the hole 8.

As shown in FIGS. 1 to 3, the stopper 10 is formed with an engaging portion 11, a long hole 12 into which the pin 9 is fitted, a spring hook portion 13, and a projecting piece 14 facing the rotation range of the speed governor 5. A slope 15 is formed on the depressed side end surface of the engaging portion 11 as shown in FIG.
The protruding piece 14 is covered with a cover 16 made of rubber or the like. A spring 18 is stretched between the spring hook 13 and the spring hook 17 fixed to the frame 1.

The speed governor 5 has a protruding piece 1 in which a rotating body 19 is formed of an elastic body such as rubber and covered with a cover 16 such as rubber.
4 faces the rotation range of the rotating body 19.

The operation of the music box is such that when the entire winding shaft 3 is wound up and the other end 20 of the stopper 10 is rotated counterclockwise against the spring 18 in FIG. 2, it is engaged with the hole 8. The part 11 is pulled out from the hole 8, the stopper 10 is returned to the front side by the spring 18, and the cover 1 of the protrusion 14 that is locked to the rotating body 19 of the speed governor 5 is removed.
6 is detached from the rotating body 19, the drum 4 is rotated, and even if the rotation of the stopper 10 is released, the engaging portion 1
1 is not engaged with the hole 8, and the cover 16 of the projecting piece 14 does not stop the rotation of the rotating body 19.

Next, when the drum 4 is rotated once and approaches the end of one song, the engaging portion 11 of the stopper 10 as shown in FIG.
When the slope 15 slowly slides into the hole 8 and the front end surface 21 of the engaging portion 11 is engaged with the hole 8, the stopper 10 resists the spring 18 and slides into the elongated hole 12.
Drum 4 after being slid forward according to the length of
rotation is stopped, and at the same time the cover 16 is closed to the speed governor 5.
The rotation of the rotary body 19 is stopped, and one sound performance is completed.

Therefore, when the gear 7, which rotates integrally with the drum 4, engages with the stopper 10, the slope 15 slides little by little into the hole 8, and the spring pressure of the spring 18 is dispersed, preventing the generation of noise, thereby preventing the rotation of the speed governor 5. The combination of the body 19 and the cover 16 of the projecting piece 14 prevents noise generation, and the sense of pitch for enjoying the melody is not impaired, the musical effect is improved, and the high-class image of the music box is enhanced.

When the stopper 10 is rotated counterclockwise and held, the Geneva gear 22 rotatably supported on the barrel 2 and the Geneva protrusion 23 fixed to the Zener shaft 3 rotate the Zener shaft 3. The music box will play until it is stopped.

In the music box described above, the drum 4 is the drum shaft 2.
This music box can play two types of songs by moving on the drum 4, and the hole 8 is provided at the eccentric position of the gear 7 that rotates integrally with the drum 4. However, if the drum does not move, the eccentricity of the end plate of the drum A hole 8 may be provided at the position so as to engage with the engaging portion 11 of the stopper 10.

[Effect of idea]

As mentioned above, the present invention is such that the slope formed at the engagement part of the stopper gradually slides into the hole provided at the eccentric position of the end plate or gear that rotates integrally with the drum, and the spring pressure is dispersed, generating impact noise. To provide a music box that has excellent practical effects, such as the structure in which the rotation of the drum is stopped without any disturbance, so the musical effect is improved and the high-class image of the music box is enhanced without impairing the pitch of enjoying the melody. You can.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is an enlarged cross-sectional plan view of the main parts of the music box, Fig. 2 is an external plan view of the music box, Fig. 3 is a side view of the main parts of the stopper and gears, and Fig. 4 5 is an explanatory diagram of the operation of the main part of the stopper, and FIG. 5 is an explanatory diagram of the operation of the conventional stopper. 4...Drum, 5...Governor, 6...Diaphragm,
7... Gear, 8... Hole, 10... Stopper, 1
1... Engaging portion, 15... Slanted surface, 14... Protruding piece.

Claims (1)

[Scope of utility model registration request] A drum, a diaphragm that is repelled by a pin provided on the drum, a governor that rotates the drum at a constant speed, and a hole provided at an eccentric position of an end plate of the drum or a gear that rotates integrally with the drum. a stopper having a protruding piece that is slidably supported and faces the rotation range of the speed governor and an engaging part that falls into the hole; and a spring that biases the stopper, the engaging part of the stopper The end face of the end plate or the gear on the forward side in the rotational direction is a slope, and the spring urges the engaging portion of the stopper toward the end plate or the gear, and the projecting piece is A music box characterized in that the music box is biased in a direction substantially perpendicular to the biasing direction and outside the rotation range.