JPH11272267A - Music box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a music box which can play a certain piece of music using a simple structure, play music for a long playing time, and broaden a playable range. SOLUTION: A plurality of pins 2 made of magnetic material are inserted into a plurality of holes 1a provided along a predetermined baseline on the outer peripheral surface of a rotating cylinder 1, and a plurality of vibrating valves 3 allocated to respective scales are selectively struck by the selected ones of the plurality of pins 2. A predetermined rotating position of the rotating cylinder is detected by a detection means, and electromagnets 5 provided to correspond to the plurality of pins 2 selectively causes the plurality of pins 2 to project from the outer peripheral surface of the cylinder according to the detection output of the detection means and the music to be played, to thereby strike the plurality of vibrating valves 3 selectively according to the rotation of the rotating cylinder. The pin projected by either of the plurality of electromagnets is returned by a return means 6 into the hole corresponding to the pin until the pin again approaches the electromagnet corresponding to the pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a music box.

[0002]

2. Description of the Related Art A conventional music box will be described with reference to FIG. On the table 4, a large number of pins 2 arranged according to a curve are erected on the peripheral surface of a cylinder 1 rotatably supported in one direction indicated by an arrow. 1X is a rotation axis of the cylinder 1. In accordance with the rotation of the cylinder 1, a comb-shaped vibrating valve plate 3M including a plurality of vibrating valves 3 having different lengths sequentially according to the scale played by the pins 2 is attached to the column 7 by screws 8. The support 7 is mounted on the base 4.
The pins 2 are erected on the outer peripheral surface of the cylinder 1 along the circles corresponding to the vibration valves 3 on the outer peripheral surface of the cylinder 1.

[0003] The performance time of this music box is determined by cylinder 1
Corresponds to the time for one rotation. Therefore, when playing a long song, a cylinder having a long diameter is required.

A pin is planted at a position corresponding to the vibration valve on the outer peripheral surface of the cylinder, and a pin is also planted at a position corresponding to the position between the adjacent vibration valves, and is planted at a position corresponding to the vibration valve. The vibration valve is flipped by the upright pin, and the cylinder
After rotating, there is also a music box in which the cylinder is moved in the axial direction so that the vibrating valve is flipped by a pin erected at a position corresponding to the position between the adjacent vibrating valves. Even if the diameter is not increased, the playing time of the song can be extended. However, this music box has a complicated structure because the cylinder must be moved in the axial direction for each rotation of the cylinder.

[0005] The above-mentioned conventional music box uses a cylinder in which pins are erected according to the music to be played, so that only one music is played, and at most several music is played. or,
No vibration valve is provided which is not flipped by the pin 2.

Therefore, a music box capable of playing an arbitrary (or a large number) music has been proposed. In the automatic performance music box disclosed in Japanese Utility Model Laid-Open No. 5-69792, a plurality of claws each playing a plurality of leads arranged for each musical scale are provided on a predetermined generatrix on an outer peripheral surface of a cylinder, and the plurality of claws are separately provided inside the cylinder. The provided solenoid makes the cylinder protrude out of the cylinder or retract into the cylinder depending on the music.

In the programmable music box disclosed in Japanese Patent Application Laid-Open No. 9-237086, a plurality of pins are respectively provided along the radial direction of the rotating disk or along the generatrix on the outer peripheral surface of the rotating cylinder. And each pin
By heating the shape memory alloy, it is selectively erected according to the tune, and the vibrating comb-teeth portion for each musical scale arranged so as to face the surface of the rotating disk or to face the outer peripheral surface of the rotating cylinder. I try to play.

[0008]

Problems to be Solved by the Invention
In the automatic performance music box disclosed in Japanese Patent Laid-Open Publication No. H11-27083, a solenoid for driving a claw that flips a lead must be provided in a rotary cylinder, and a drive current for driving the solenoid and performance data must be transmitted to the rotary cylinder. There is a disadvantage that it becomes complicated. In addition, since the solenoid for driving the claw that flips the lead is provided in the rotary cylinder, the number of claws along the circle on the outer peripheral surface of the rotary cylinder is inevitably reduced, so that the playing speed is slow unless the cylinder is rotated at high speed. turn into.

In the programmable music box disclosed in Japanese Patent Application Laid-Open No. 9-237086, pins for flipping the vibrating comb teeth are selectively raised by selective heating of the shape memory alloy. It takes time to stand or lay down. For this reason, the rotating speed of the rotating disk or the rotating cylinder cannot be increased too much. Further, since the erecting of the pins is controlled by heating the shape memory alloy, the heat between the adjacent shape memory alloys is reduced. In order to avoid mechanical interference, the interval between pins along the radial direction of the rotating disk and the interval between pins along the generatrix direction of the rotating cylinder cannot be reduced so much, the number of pins decreases,
Correspondingly, the number of vibrating comb teeth to be played by the pin is reduced, and the range of performance is naturally narrowed.

In view of the above, the present invention is capable of playing a song with a simple structure, playing a song having a long playing time, and taking a wide range of music that can be played. It is intended to propose a music box that can do.

[0011]

SUMMARY OF THE INVENTION The present invention provides a rotating cylinder, a plurality of pins made of a magnetic material inserted into a plurality of holes provided along a predetermined generatrix on the outer peripheral surface of the rotating cylinder, and A plurality of vibrating valves for each scale selectively played by a selected one of the plurality of pins, a detecting means for detecting a predetermined rotational position of the rotary cylinder, a detection output of the detecting means and a music to be played. Accordingly, from the outer peripheral surface of the cylinder, a plurality of pins are provided corresponding to the plurality of pins, respectively, and the plurality of pins are selectively protruded, and the plurality of vibration valves are selectively flipped according to the rotation of the rotary cylinder. A plurality of electromagnets, and return means for returning a pin protruded by any of the plurality of electromagnets into a hole corresponding to the pin before approaching the electromagnet corresponding to the pin again. That is a music box.

According to the present invention, the predetermined rotational position of the rotary cylinder is detected by the detecting means, and the plurality of pins are respectively applied from the outer peripheral surface of the cylinder to the plurality of pins by the electromagnet in accordance with the detected output and the music to be played. Correspondingly provided, the plurality of pins are selectively protruded, the plurality of vibrating valves are selectively repelled according to the rotation of the rotary cylinder, and are returned by any of the plurality of electromagnets by return means. The pin is returned into the hole corresponding to the pin before approaching again by the electromagnet corresponding to the pin.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is directed to a rotating cylinder, and a plurality of pins made of a magnetic material inserted into a plurality of holes provided along a predetermined generatrix on the outer peripheral surface of the rotating cylinder, respectively. A plurality of vibration valves for each musical scale selectively played by a selected one of the plurality of pins; a detecting means for detecting a predetermined rotational position of the rotary cylinder; a detection output of the detecting means and a music piece to be played Are provided corresponding to the plurality of pins from the outer peripheral surface of the cylinder, respectively, and the plurality of pins are selectively protruded, so that the plurality of vibration valves are selectively resilient in accordance with the rotation of the rotary cylinder. A plurality of electromagnets to be turned on, and return means for returning a pin protruded by any of the plurality of electromagnets into a hole corresponding to the pin before approaching again near the electromagnet corresponding to the pin. Have Is a music box that was so.

According to a second aspect of the present invention, in the music box of the first aspect, the plurality of pins are arranged along a plurality of buses at equal angular intervals on the outer peripheral surface of the rotary cylinder, and are connected to the plurality of buses. The detecting means is a music box which is inserted into a plurality of holes provided along the intersecting circles, and which detects the rotational positions at equal angular intervals equal to the number of buses of the rotary cylinder.

According to a third aspect of the present invention, in the music box of the first aspect, the returning means is a music box which is a pressing plate extending in a generatrix direction of the outer peripheral surface of the cylinder and slidingly contacting the outer peripheral surface.

According to a fourth aspect of the present invention, in the music box according to the first aspect of the invention, the return means includes a pressing portion provided on the core of the electromagnet, and the rotating cylinder is moved closer to the pressing portion as the rotating cylinder rotates. And a member provided with a concave surface facing a part of the outer peripheral surface of the rotary cylinder, wherein the interval between the outer peripheral surface and the outer peripheral surface is gradually narrowed.

According to a fifth aspect of the present invention, in the music box of the first aspect, a counter for counting detection pulses from the detection means, music data storage means, and music data storage means using the count output from the counter as an address signal. To read music data, and from the read music data, a scale signal generating means for generating a scale signal synchronized with the detection pulse from the detecting means, and a scale signal generating means of the plurality of electromagnets. An electromagnet driving means for supplying a driving pulse to the electromagnet corresponding to the scale signal.

According to a sixth aspect of the present invention, in the music box of the second aspect, a counter for counting detection pulses from the detection means, music data storage means, and music data storage means using the count output from the counter as an address signal. To read music data, and from the read music data, a scale signal generating means for generating a scale signal synchronized with the detection pulse from the detecting means, and a scale signal generating means of the plurality of electromagnets. An electromagnet driving means for supplying a driving pulse to the electromagnet corresponding to the scale signal.

[Specific Example of Embodiment of the Invention] A specific example of a music box according to an embodiment of the present invention will be described below with reference to the drawings. First, the structure of a specific example of a music box will be described with reference to FIG. 1 showing a cross-sectional view of the specific example and FIG. 2 showing a perspective view. Reference numeral 1 denotes a cylinder made of a non-magnetic material, which is rotatably supported on a table 4 by a motor (not shown) (spring can be used) so as to rotate at a constant speed in the direction of the arrow. 1X is a rotation axis of this cylinder.

Holes 1 extending in the radial direction at predetermined intervals along a predetermined generatrix on the outer peripheral surface of the cylinder 1
For example, 49 holes are provided. These holes 1a
, Pins 2 each made of a magnetic material, for example, steel, are inserted. In this case, the number of pins 2 is also 4
9

A vibrating valve plate 3M comprising 49 vibrating valves (vibrating plates, vibrating pieces) 3 arranged in musical order so as to be selectively flipped by the pins 2 is provided. This 4
The nine oscillating valves 3 cover sounds of a musical scale of four octaves. The vibrating valve plate 3M is attached to a column 7 by a screw 8, and the column 7 is attached to the base 4.

Reference numeral 5 denotes 49 electromagnets (consisting of a rod-shaped core 5A and a coil 5B wound around the core 5A), which are mounted on a holder 5a mounted on the base 4 and held on the base 4 5b is provided in each recess. When the 49 pins 2 reach the position corresponding to the electromagnet 5 according to the rotation of the cylinder 1, the electromagnet 5 is selectively energized, and the pin 2 is pulled by the energized electromagnet 5, and the pin 2 is moved. It protrudes from the hole 1a to the outside of the outer peripheral surface of the cylinder 1. Thereafter, as the cylinder 1 rotates, the pins 2 projecting from the outer peripheral surface of the cylinder 1 flip the vibration valve 3. The protruding length of the pin 2 is determined by the distance between the end surface of the core 5A of the electromagnet 5 on the cylinder 1 side and the surface of the cylinder 1 facing the end surface.

Since the moving direction of the pin 2 is substantially perpendicular to the vibration valve 3, when the pin 2 collides with the vibration valve 3, there is no possibility that the pin 2 is pushed back into the corresponding hole 1a. .

Also, by making the length of the pin 2 sufficiently longer than its protruding length, when the pin 2 flips the elastic valve 3, the reaction force against the mouth of the hole 1a can be reduced, and Can be reduced with respect to the hole 1a.

When the pin 2 stays in the hole 1a and does not protrude from the outer peripheral surface of the cylinder 1, the pin 2 can flip the vibration valve 2 even if the cylinder 1 rotates. Absent.

Next, referring to a partial cross-sectional view of the specific example of FIG. 3, a photo sensor 1 for detecting the rotational position of the cylinder 1 will be described.
0 will be explained. In the vicinity of the hole 1a of the cylinder 1, a reflection pattern 1b is formed on a part of the outer peripheral surface of the cylinder 1 on the upstream side of the rotation, and the other part is painted black, for example, to be a non-reflection surface. A photo sensor 10 is provided upstream of the electromagnet 5 in the rotation direction of the cylinder 1 so as to face the reflection pattern 1b on the outer peripheral surface of the cylinder 1, and is mounted on the table 4. The attached state is not shown.

In this case, one position detection pulse (timing pulse) is obtained from the photosensor 10 for each rotation of the cylinder 1.

In FIG. 1, reference numeral 6 denotes a pin 2 which is pulled by the electromagnet 5 and protrudes from the outer peripheral surface of the cylinder 1.
Is fixed to the base 4 at one end, and the other end is a free end.
Are elastically biased so as to slide on the generatrix on the outer peripheral surface of the cylinder 1. Since the outer peripheral surface of the cylinder 1 rotates while contacting from the root of the holding plate 6 toward the free end, even if there is a pin 2 protruding from the outer peripheral surface of the cylinder 1, it is pushed back into the hole 1 a by the holding plate 6. It is.

The continuous rotation of the cylinder 1 repeats a series of operations including the projection of the pin 2, the elasticity of the pin 2, and the return of the pin 2 to the hole, thereby producing continuous sound. By simultaneously energizing a plurality of electromagnets 5 and simultaneously playing the vibration valves 3 of different musical scales, a chord can be generated.

Based on the rotation speed of the cylinder 1 corresponding to the shortest note, the pin 2 per rotation of the cylinder 1
The rhythm can be varied by reducing the number of protrusions and increasing the interval at which the vibration valve 3 is flipped stepwise. For example, if a continuous bullet is set to a speed equivalent to a sixteenth note, every four revolutions of the cylinder 1 will have a rhythm corresponding to a quarter note.

Next, a partial sectional view of another specific example of FIG. 4 will be described. For example, 49 × 6 = 294 pins 2 are arranged along six buses at equal angular intervals (60 °) on the outer peripheral surface of the rotary cylinder 1 and along a circle intersecting the six buses. It should be inserted into each of 49 × 6 = 294 holes 1a provided. Then, six rows of holes 1a of the cylinder 1
, Reflection patterns 1b are formed at six positions at intervals of 60 ° on the upstream side of the rotation of the cylinder 1, and the outer peripheral surface of the cylinder 1 excluding the reflection patterns 1b is painted black, for example, and is non-reflective. Face. One photosensor 10 is provided upstream of the electromagnet 5 in the rotation direction of the cylinder 1 so as to face the reflection pattern 1b, and is mounted on the table 4.

In this case, six position detection pulses (timing pulses) are obtained from the photo sensor 10 for each rotation of the cylinder 1. Assuming that the rotation speed of the cylinder 1 is 2
Assuming 00 rpm, the minimum interval between the bullets is 50 msec, which is a quarter note ♪ = 150 per minute, and it is possible to speak up to a thirty-second note. In this specific example, the frequency of energization to the electromagnet 5 is increased without changing the number of the electromagnets 5.

Next, another example of the music box will be described with reference to the sectional view of FIG. In the case of this specific example, a return means for returning the pin 2 protruding from the outer peripheral surface of the cylinder 1 into the hole 1a thereof is provided with a pressing portion 6 'integrally provided at the tip of the core 5A of the electromagnet 5, As the cylinder 1 rotates, the distance between the cylinder 1 and the outer peripheral surface of the cylinder 1 gradually decreases as the cylinder approaches the holding portion 6 ′. A member including a concave surface 16 </ b> A facing a part of the outer peripheral surface of the rotary cylinder 1 (cylinder) Cradle 16). Although not shown, the receiving table 16 is fixed on the table 4.

In this case, the pin 2 is connected to the core 5A of the electromagnet 5.
Since the distance between the cylinder 1 and the holding portion 6 'when detaching from the holding portion 6' formed integrally with the cylinder 1 becomes considerably short,
Since the collision noise of the pin 2 with the electromagnet 5 is reduced and the amount of protrusion of the pin 2 is reduced, the attraction force of the electromagnet 5 can be reduced, and the power consumption of the electromagnet 5 is reduced.

Next, a circuit of a music box of a specific example will be described with reference to a block diagram of FIG. Photo sensor 10
The detected pulse (timing pulse) is supplied to a counter (tempo counter) 11 to be counted. Further, a detection pulse from the photo sensor 10 is supplied to a CPU (central processing unit) (microcomputer) 13. This counter 11 can be reset (cleared) by the CPU 13.

Reference numeral 12 denotes a music data memory, which supplies a count signal from the counter 11 as an address signal to the memory 12 under the control of the CPU 13 so that the stored music data is read out and supplied to the CPU 13. I do. The CPU 13 converts the music data read from the memory 12 into a musical scale signal, and
4

N electromagnets 5-1, 5-2, 5-3,.
‥‥‥‥‥, 5-N, N pins 2-1, 2-2, 2-
3, ‥‥‥‥‥‥ 2-N and N vibration valves 3-1 and 3-
2, 3-3, ‥‥‥‥‥‥, and 3-N are associated. Here, N is, for example, 49. Also, the vibration valves 3-1 and 3
Reference numerals −2, 3-3, ‥‥‥‥‥‥, and 3-N denote vibration valves in a range of four octaves, which are sequentially arranged from a lower scale to a higher scale.

The electromagnet selection drive circuit 14 includes N electromagnets 5-1, 5-2, 5-3,.
A drive pulse is supplied to the selected electromagnet in accordance with the scale signal from the CPU 13, and the N pins 2-1, 2-2, 2-
3. Pull the pin corresponding to the electromagnet supplied with the drive pulse of 内 2-N to project from the outer peripheral surface of the cylinder 1, and according to the rotation of the cylinder 1, the outer peripheral surface of the cylinder 1 Vibrating valves 3-1 and 3
Flip the vibrating valve corresponding to that pin out of -2, 3-3, ‥‥‥‥‥‥ 3-N.

Next, referring to the flowchart of FIG.
The operation of the music box in a specific example will be described. Note that a timing chart of the operation of the specific example of FIG. 8 is also referred to. Step S
At T-1, the CPU 13 sets the tempo counter 11
Reset. Step ST-1 is followed by step ST
-2.

In step ST-2, the photo sensor 10
Is supplied to the counter 11 to count it (FIG. 8A). After step ST-2, the process proceeds to step ST-3.

In step ST-3, the count signal from the counter 11 is supplied to the music data memory 12 as a read address signal, and the music data is read.
Supply to CPU13. After step ST-3, the process moves to step ST-4.

In step ST-4, the CPU 13 generates a musical scale signal synchronized with the timing signal from the photosensor 10 from the music data read from the memory 12. Following step ST-4, step ST-
Move to 5.

In step ST-5, the electromagnet selection drive circuit 14 performs the following based on the scale signal received from the CPU 13.
N electromagnets 5-1, 5-2, 5-3, ‥‥‥‥‥‥,
A drive pulse (S1 in FIG. 8B, S3 in FIG. 8D, and S3 in FIG. 8E) to be supplied to the selected electromagnet among 5-N is generated. In FIGS. 8C and 8F, no drive pulse is generated. After step ST-5, the process proceeds to step ST-6.

In step ST-6, the corresponding pin 2 is pulled by the electromagnet 5 to which the drive pulse has been supplied, and is projected from the outer peripheral surface of the cylinder 1 to the outside. After step ST-6, the process proceeds to step ST-7.

In step ST-7, the corresponding vibration valve 3 is flipped by the protruding pin 2. Subsequent to step ST-7, the process returns to step ST-2, in which the timing pulse (the rotation position detection pulse of the cylinder 1) from the photo sensor 10 is supplied to the counter 11 for counting.

[0046]

According to the first aspect of the present invention, a rotary cylinder and a plurality of pins made of a magnetic material inserted into a plurality of holes provided along a predetermined generatrix on the outer peripheral surface of the rotary cylinder, A plurality of vibration valves for each musical scale selectively played by a selected one of the plurality of pins; a detecting means for detecting a predetermined rotational position of the rotary cylinder; a detection output of the detecting means and a music piece to be played Are provided corresponding to the plurality of pins from the outer peripheral surface of the cylinder, respectively, and the plurality of pins are selectively protruded, so that the plurality of vibration valves are selectively resilient in accordance with the rotation of the rotary cylinder. A plurality of electromagnets to be turned on, and return means for returning a pin protruded by any of the plurality of electromagnets into a hole corresponding to the pin before approaching again near the electromagnet corresponding to the pin. Have Since, it is possible to play any song with a simple structure, it can play a long song and time, moreover, it is possible to obtain a music box which can take a wide range that can be played.

According to the second aspect of the present invention, in the music box of the first aspect, the plurality of pins are formed along a plurality of buses at equal angular intervals on the outer peripheral surface of the rotary cylinder and the plurality of pins are provided. It is inserted into a plurality of holes provided along a circle intersecting with the bus, and the detecting means detects the rotational positions at equal angular intervals equal to the number of buses of the rotary cylinder. In addition to the effects of the present invention, it is possible to obtain a music box that can shorten the minimum interval at which the pin flips the vibration valve.

According to the third aspect of the present invention, in the music box of the first aspect of the present invention, the return means is a pressing plate extending in the generatrix direction of the outer peripheral surface of the cylinder and slidingly contacting the outer peripheral surface. In addition to the effect of the first aspect of the present invention, it is possible to obtain a music box provided with a simple returning means.

According to the fourth aspect of the present invention, in the music box of the first aspect of the present invention, the return means comprises: a pressing portion provided on the core of the electromagnet; A member having a concave surface facing a part of the outer peripheral surface of the rotary cylinder, the distance between the outer cylinder and the outer peripheral surface of the rotary cylinder being gradually narrowed. The distance between the cylinder and the holding part when detaching from the holding part formed integrally with the pin is considerably shortened, the collision noise of the pin with the electromagnet is reduced, and the amount of protrusion of the pin is shortened. It is possible to obtain a music box which can be reduced in size and which can reduce the power consumption of the electromagnet.

According to a fifth aspect of the present invention, in the music box of the first aspect of the present invention, a music data storage means, a counter for counting detection pulses from the detection means, a music data storage means, and a count output from the counter as an address signal. A musical scale signal generating means for supplying music data to the storage means to read musical data and generating a musical scale signal synchronized with a detection pulse from the detecting means from the read musical data; and a musical scale signal generating means of the plurality of electromagnets. And an electromagnet driving means for supplying a driving pulse to the electromagnet corresponding to the musical scale signal from the player. Therefore, in addition to the effect of the first invention, it is possible to perform using any music data stored in the storage means. You can get a music box that you can.

According to a sixth aspect of the present invention, in the music box of the second aspect of the present invention, a music data storage device includes a counter for counting detection pulses from the detection device, a music data storage device, and a count output from the counter as an address signal. A musical scale signal generating means for supplying music data to the storage means to read musical data and generating a musical scale signal synchronized with a detection pulse from the detecting means from the read musical data; and a musical scale signal generating means of the plurality of electromagnets. And an electromagnet driving means for supplying a driving pulse to the electromagnet corresponding to the musical scale signal from the player, so that in addition to the effect of the second invention, it is possible to perform using any music data stored in the storage means. You can get a music box that you can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a music box according to a specific example of an embodiment of the present invention.

FIG. 2 is a perspective view showing a structure of a music box according to a specific example of the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a part of a music box according to a specific example of the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a part of a music box according to another specific example of the embodiment of the present invention.

FIG. 5 is a sectional view showing another specific example of the embodiment of the present invention.

FIG. 6 is a block diagram showing a circuit of a music box according to a specific example of the embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of a music box according to a specific example of the embodiment of the present invention.

FIG. 8 is a timing chart of the operation of a music box according to a specific example of the embodiment of the present invention.

FIG. 9 is a perspective view showing a conventional music box.

[Explanation of symbols]

1 cylinder, 2, 2-1 to 2-N pin, 3, 3-1
3-N vibrating valve, 3M vibrating valve plate, 4 units, 5 electromagnets, 5A core, 5B coil, 5a electromagnet holder, 5b electromagnet holding unit, 6 holding plate, 6 'holding unit, 7 columns.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yasuo Nagata 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Yoshihisa Mori 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (6)

[Claims] 1. A rotating cylinder, a plurality of pins made of a magnetic material inserted into a plurality of holes provided along a predetermined generatrix on an outer peripheral surface of the rotating cylinder, and a selected one of the plurality of pins. A plurality of vibrating valves of different scales selectively played by the pins, detecting means for detecting a predetermined rotational position of the rotary cylinder, and an outer periphery of the cylinder in accordance with a detection output of the detecting means and a music to be played. A plurality of electromagnets provided corresponding to the plurality of pins from a surface, respectively, and selectively projecting the plurality of pins to selectively flip the plurality of vibration valves according to rotation of the rotary cylinder. And return means for returning the pin protruded by any of the plurality of electromagnets into the hole corresponding to the pin before approaching again near the electromagnet corresponding to the pin. When Music Box that. 2. The music box according to claim 1, wherein the plurality of pins extend along a plurality of buses at equal angular intervals on an outer peripheral surface of the rotary cylinder and intersect with the plurality of buses. Wherein the detecting means detects rotational positions at equal angular intervals equal to the number of the buses of the rotary cylinder. 3. The music box according to claim 1, wherein the return means is a pressing plate extending in a generatrix direction of an outer peripheral surface of the cylinder and slidingly contacting the outer peripheral surface. 4. The music box according to claim 1, wherein the return means includes: a pressing portion provided on a core of the electromagnet; and the rotation cylinder rotates as the rotation cylinder rotates. A music box comprising: a member having a concave surface facing a part of the outer peripheral surface of the rotary cylinder, wherein a gap between the outer peripheral surface and the outer peripheral surface is gradually narrowed. 5. The music box according to claim 1, wherein a counter for counting detection pulses from said detection means, music data storage means, and a count output from said counter is supplied to said music data storage means as an address signal. Music data read, from the read music data, a scale signal generating means for generating a scale signal synchronized with the detection pulse from the detecting means, from the scale signal generating means of the plurality of electromagnets And an electromagnet driving means for supplying a driving pulse to an electromagnet corresponding to the musical scale signal. 6. A music box according to claim 2, wherein a counter for counting detection pulses from said detection means, music data storage means, and a count output from said counter is supplied to said music data storage means as an address signal. Music data read, from the read music data, a scale signal generating means for generating a scale signal synchronized with the detection pulse from the detecting means, from the scale signal generating means of the plurality of electromagnets And an electromagnet driving means for supplying a driving pulse to an electromagnet corresponding to the musical scale signal.