JPH09319362A - Disk music box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to perform a required melody such as a melody created by a user himself (or herself) by a disk music box. SOLUTION: In the disk music box 1, a disk 3 is rotated by a motor, a star wheel is rotated so as to be guided by respective performance holes 4 formed on the disk 3 and a music box valves are touched by the star wheel to perform a melody. In this case, performance hole forming indexes 31 are formed on the disk 3 radially and concentrically from the rotational center of the disk 3 so that rhythm is expressed by the radial indexes and the scale is expressed by the concentrical indexes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotates a disc by a motor, and a star wheel is guided and rotated in each play hole provided in the disc to play a music box valve to play a melody. The present invention relates to a disc music box, in which a disc is provided with indicators such as display lines so that a user can play a desired melody such as a melody created by the user.

[0002]

2. Description of the Related Art Generally, the sounding means used for notifying a clock or the like is not limited to one that emits an inorganic electronic sound by using a sounding circuit, a speaker, etc., and a mechanical music box device is used to make it soft and old-fashioned. It is known that the sound of a music box is obtained.

Such a music box device is for playing a predetermined music box, and a sounding body having a plurality of music box valves and a projection having a music pattern arranged opposite the sounding body. In general, a drum body and a drive unit that rotationally drives the drum body.

In addition, a disc formed in the shape of a thin disk is formed with a large number of intermittent playing holes in the circumferential direction for each track in the radial direction of the disc, and the playing holes are used to play the music box. The disc music box that does is known.

The disc music box is a music box to which a disc-shaped disc having a large number of playing holes is attached.
The disc is rotatably driven by the disc drive mechanism of the music box body, while the star wheel that flips the music box valve is rotatably mounted on the star wheel shaft. Then, when the disc is rotated by the disc drive mechanism, the playing hole of the disc hooks the claw of the star wheel corresponding to the playing hole to rotate the star wheel, and the other claw of the rotating star wheel causes the music box valve. It is a music box in the form of playing and playing a melody.

Further, in this disc music box, a disc of a relatively thin thickness is held by holding the disc at a portion facing the star wheel by holding it from both upper and lower sides by a disc pressing arm having a pressing roller. Can be used. Therefore, a large number of discs on which performance hole patterns of different music pieces are formed can be produced inexpensively. Further, since the disc itself has a disk-shaped planar shape, it can be easily stored and stored, and can be transported easily.

Further, since the disc itself is easily handled in this way, it can be easily attached to and detached from the music box, and the disc can be replaced in a short time. Therefore, by preparing a plurality of discs of different tunes beforehand, selecting a tune from these discs and exchanging the discs, the music to be played by the music box can be changed quickly and easily.

As described above, in the disc music box, it is possible to select any disc from a plurality of discs and easily mount the disc music box, as compared to a fixed-music type music box dedicated to one song. Have advantages.

[0009]

The disc music box has the above-mentioned advantages, but on the other hand, the disc is provided with preset playing holes, and the music box playing music is provided for each disc. This is common not only to disc music boxes but to music boxes in general, but it is extremely difficult for a user to play a melody related to his / her idea on the music box.

Therefore, the present invention makes it easy to set the position of the playing hole based on the idea that the position of the playing hole of the disk is provided by itself to devise its own melody. It proposes a disc music box that can be done.

[0011]

According to the first aspect of the present invention, a disc is rotated by a motor, and a star wheel is guided and rotated in each of the playing holes provided in the disc. A disc music box for playing a melody by playing a valve, wherein the disc is provided with indicators for forming playing holes radially and concentrically from the center of rotation of the disc.

According to the second aspect of the present invention, in the first aspect of the invention, the radial index is a rhythm,
The concentric indexes are disc music boxes each having a scale.

Since the music box valves are usually arranged in order in the radial direction from the center of rotation of the disc, when the performance hole is punched based on the radial and concentric circular indexes, the center of rotation is formed. The size of the interval from to appears as a difference in pitch. Therefore, each concentric index is
The same thing shows the same scale. Also, the magnitude of the angle of each radial index appears as a difference in rhythm.
Therefore, those with the same angle show the same time signature.

As described above, according to the present invention, the disc which plays the melody of its own very easily and surely based on the index for forming the playing hole which is provided radially and concentrically from the center of rotation of the disc, and You will be able to devise the disc music box.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the present invention will be described below with reference to FIGS. It should be noted that the basic configuration of the disc music box described below is common to each of the specific examples described later, and thus the description of the disc music box in each specific example is omitted.

1 and 2 are external perspective views showing a disc music box according to the present invention, and FIG. 3 is an external perspective view with a disc removed. In these figures, a disc music box 1 of the present example, as will be described later, has a disc-shaped disc 3 provided with playing holes 4 and 4 by a user, and the disc 3 is used to perform a music box device. Is.

That is, the disc music box 1 is
The music box body 2 that rotatably supports the disk 3 horizontally, the disk drive mechanism 5 that has the motor M that rotationally drives the disk 3, and the star wheel 12 that is disposed face-to-face with the lower surface of the disk 3 that is held. A star wheel shaft 7 that is rotatably supported, and this star wheel shaft 7.
And a music box sounding body 17 arranged to face each other.

The disc music box 1 has a music box body 17a which is a base and is formed on the music box body 2 in a predetermined number and in a predetermined comb tooth shape according to the number of scales.
A star wheel 1 that has a music box sounding body 17 having a horizontal direction and faces these music box valve body parts 17a.
2 is provided with a star wheel shaft 7 that rotatably supports the disk 2 and a disk holding portion that faces the star wheel shaft 7 and supports the disk horizontally and rotatably.
A disk drive mechanism 5 having a motor M that rotationally drives the disk 3 in a predetermined direction is provided.

The music box sounding body 17 is formed of a metal material in the shape of a long plate, and is horizontally arranged on the music box body 2. That is, the music box sounder 1
The base end of one end side of 7 is fixed to the pedestal part provided in the music box main body 2, while the tip end of the other end is provided with a plurality of music box valve parts 17a which are sound producing parts. Further, the music box valve portion 17a is formed in a comb tooth shape,
A predetermined number is provided according to the number of scales to be pronounced, and each is formed with a predetermined thickness and length according to the scale. Therefore, when the tips of the music box valves 17a and 17a are flipped, a music box sound of a predetermined scale / pitch can be generated.

Further, a plurality of star wheels 12 are rotatably supported in rotatably to face the comb tooth portions (music box valve 17). Star wheels 12 are loosely fitted on the star wheel shaft 7, and the outer peripheral surfaces of these star wheels 12 are provided at equal intervals and the claw portions 12a, 12 are provided.
b, 12c and 12d are projected. When the disc 3 is attached to the music box body 2 and a monitor switch (not shown) is turned on, the disc drive mechanism 5
The disc 3 is driven to rotate by the claws 12a, 12b, 12c, and 12d of the star wheel 12 at a predetermined timing, and the music box valve 17a corresponding to the musical scale of the music is played. That is, each playing hole 4 of the disk 3 is hooked with the claw portions 12a, 12b, 12c, 12d of the star wheel 12 corresponding to the playing hole 4, forcibly rotating the star wheel 12, and the rotating star wheel. 12 other subsequent claws 12
The a, 12b, 12c, and 12d finally flip the music box valve portion 17a, and a music box sound is generated.

As shown in FIG. 4, a motor M and the rotational driving force of the motor M are transmitted to the music box main body 2 by decelerating them to the star wheel shaft 7 and a disk pressing rotor 64b which will be described later. The gear train 6 is provided.

As the motor M, a DC motor is used,
It is connected to a motor drive circuit (not shown), and is provided so as to be able to perform normal rotation and reverse rotation operations by the forward rotation and reverse rotation drive currents supplied from this motor drive circuit.
Further, as will be described later, the motor M is configured so that a predetermined operation is started by turning on a monitor switch or mounting the disk 3.

The gear train 6 is a worm gear 61 of the motor M.
The first gear 62a and the second gear 62, which are sequentially connected to each other.
b, and a third gear 63a.
The fourth gear 63b rotating together with the holding roller shaft 15a
Is connected to a gear 64a fixed to the gear 64a. Therefore, the motor driving force is decelerated and transmitted to drive the disk 3 at a predetermined rotation.

A worm gear 61 made of plastic is fixed to the output shaft of the motor M.
The first gear 62a is meshed with. The first gear 62a is fixed to one end of a plastic shaft 62 which is orthogonal to the motor output shaft and parallel to the star wheel shaft 7, and the other end of the shaft 62 has a second gear. 62
b is fixed, and the second gear 62b is the first gear 62a.
It is designed to rotate with you. Also, the second gear 62b
Is meshed with the third gear 63a, and the third gear 63a
Is fixed to the motor side end of the star wheel shaft 7. A predetermined reduction ratio is set between the gears 62a, 62b, 63a.

Further, a fourth gear 63b is coaxially fixed to the third gear 63a so as to rotate together. The fourth gear 63b is meshed with the gear 64a, and the gear ratio between them is set to 1: 1. That is, the gear 64a is fixed to the end portion of the pressing roller shaft 15 on the motor side, and the pressing roller shaft 15 is axially supported along the longitudinal direction of the disk pressing arm 8. When the disc pressing arm 8 is in the closed position, the fourth gear 63b and the gear 64a for urging the disc rotation mesh with each other.

Therefore, in this gear train 6, the motor M
Is rotated, the rotation driving force is sequentially changed from the worm 61 to the first gear 62a and the second gear rotating together with the first gear 62a.
Gear 62b, third gear 63 meshing with second gear 62b
a, transmitted to the fourth gear 63b that rotates in synchronism with the third gear 63a, and is decelerated to a predetermined rotational speed by the gear ratio provided between these gears. And this fourth gear 63b
Thus, at the same time as the star wheel shaft 7 having the fourth gear 63b fixed to the tip thereof rotates, the disk rotation urging gear 64a meshing with the fourth gear 63b rotates.

Further, by rotating the star wheel shaft 7 in the forward direction, the star wheels 12, 12 are always urged to rotate in the normal direction in the normal playing direction, as will be described later. Claw portions 12a, 12b, 12c,
12d makes it easier to enter the playing hole 4 of the disk 3 rotated to the engagement position. Further, as the gear 64a rotates, the disk pressing / rotating body 64b formed integrally with the gear 64a rotates together with the gear 64a.

The star wheel shaft 7 has a disk mounting member 9 screwed on the opposite side of the music box body 2 from the motor M, and an upward U-shape which is screwed on the music box body 2 on the motor M side. It is rotatably installed between the supporting member 10 and the supporting member 10. Further, as shown in FIG. 5, star wheel partitioning members 11, 11 formed in a ring shape having a predetermined thickness are fixed to the star wheel shaft 7 at predetermined intervals, and these star wheel partitioning members 11, 11 are fixed. The star wheels 12, 12 are rotatably mounted between the two. Therefore, each of the star wheels 12 is attached to the music box valve portion 17a of the corresponding music box sounding body 17,
I am always able to face each other. Further, a disc holding roller 13 is fixed to a portion of the star wheel shaft 7 adjacent to the fourth gear 63b. A shaft 62, in which a first gear 62a and a second gear 62b are integrally formed, is installed between the U-shaped walls of the support member 10.

The disc pressing arm 8 is formed in a substantially long plate shape longer than at least the radial length of the disc 3, one end of which is pivotally supported by the music box body 2 and the other end of which is the disc of the music box body 2. The mounting bracket 9 is configured to be engageable and lockable. That is, the base 81 of the disc holding arm 8 is pivotally supported by a support member 14 provided on the outer peripheral side of the disc 3 of the music box main body 2 while being pivotally supported by the tip 82. An insertion hole portion 82a is formed to swallow and engage with the projection 91 for inserting the disk center hole of the mounting bracket 9. Further, a groove 91a is formed at the tip of the protrusion 91 over the entire circumference, and correspondingly, a stopper rod 82b that engages with the groove 91a is provided near the insertion hole 82a. It is urged to rotate. Therefore, first, the disk holding arm 8 is rotated upward, the center hole of the disk 3 is inserted into the projection 91 of the disk mounting bracket 9, and then the disk holding arm 8 is rotated downward to insert the insertion hole. 82a
Is fitted in the projection 91, the stopper rod 82b, which is rotationally urged, is engaged with the groove 91a and locked, and the disc holding arm 8, that is, the disc 3 is mounted and fixed.

Further, a pressing roller shaft 15 is axially supported on the disk pressing arm 8 along the longitudinal direction thereof.
One end of the pressing roller shaft 15 is provided with the gear 64a described above.
And a disk pressing / rotating body 64b integrally formed therewith
But is stuck. A plurality of plastic cylinders 16a are mounted on the pressing roller shaft 15. A disc-shaped pressing roller 16b is integrally formed with the cylindrical body 16a, and the pressing roller 16b holds the disk 3 against the star wheel side when the disk is pressed by the disk pressing arm 8. ing.

Therefore, in the disc music box 1 of this embodiment, the disc 3 at the portion facing the star wheels 12, 12 is held by the disc pressing arm 8 having the pressing roller 16b as described above. Discs can be used.

Further, since the outer peripheral portion of the disc 3 is sandwiched between the disc holding roller 13 and the disc pressing rotary member 64b, the disc holding roller 13 and the disc pressing rotary member 64b rotate. Therefore, the rotation can be reliably and stably performed. Further, a rubber ring 64c is mounted around the disk pressing and rotating body 64b, and the rubber ring 64c prevents slippage when the disk is rotationally driven.

The star wheels 12, 12 are made of a metal material and are formed in a ring shape, and are loosely mounted on the star wheel shaft 7. Further, along the circumferential direction of the outer peripheral surface of the ring, four claw portions 12a, 12
b, 12c and 12d are projected. These nails 1
2a, 12b, 12c and 12d are formed on the slope surface of the stage in the forward direction of rotation, and are formed in a plane orthogonal to the rotational direction in the reverse direction of rotation.

Therefore, when the star wheel shaft 7 is rotated in the forward direction, the star wheels 12, 12 are also rotated in the same direction, and the certain claw portions 12a, 12b, 12c, 1 are formed.
When 2d abuts on the music box valve portion 17a of the corresponding music box sounding body 17, it idles at its rotational position, and each of the star wheels 12, 12 is in a sound standby state. And
The rotation of the disc 3 causes the predetermined playing hole 4 to engage with the corresponding claw portion 12 of the star wheel 12 to generate a predetermined music box sound. That is, the claw portions 12a, 12b, 12c, and 12d located forward in the forward rotation direction engage with the playing holes 4 of the disc 3 and are forcibly rotated, so that the music box valve portion 17a is flicked. I have to.

As shown in FIG. 6, the disk 3 is rotationally driven in the forward direction (FIG. 6 (1)), and the playing hole 4 is one of the claw portions 12a, 12b, 12c, 12d of the star wheel 12.
For example, when the claw portion 12a is engaged (FIG. 6 (2)), the claw portion 12a is forcibly moved by the playing hole 4 and the star wheel 12 is rotated. At this time, the claw portion 12b adjacent to the claw portion 12a of the star wheel 12 abuts the music box valve portion 17a (Fig. 6 (3)), and further rotationally moves to claw the music box valve portion 17a (Fig. 6 (4)). As a result, a music box sound of a specific scale of the music box valve section 17a is generated.

On the other hand, in the case of reverse rotation, the claw portions 12a,
After the 12b, 12c, 12d abut on the music box valve portion 17a, the star wheel 12
, And stops at that position.

In this example, the disk drive mechanism 5 for rotationally driving the disk 3 and the shaft drive mechanism for rotationally driving the star wheel shaft 7 are provided by the same drive system using the motor M and the gear train 6. .

Further, the disc music box 1 of the present example includes
A stop switch 21 having a switch rod 21b for detecting one rotation of the disk 3 and a mounted / unmounted state of the disk 3 is provided. That is, as shown in FIGS. 1 to 3 again, the stop switch 21 corresponds to the stop hole 3a formed at a predetermined position on the inner peripheral side of the disc 3 and corresponds to the disc mounting bracket 9 on the music box body 2. It is arranged at a predetermined position in the vicinity. The distance between the lower surface of the disk and the stop switch 21 is set to be shorter than the entire length of the switch rod 21b by a predetermined distance, that is, the distance that the switch rod 21b contacts the lower surface of the disk and falls down.

As shown in FIG. 7, the stop switch 21 is provided with a pin-shaped switch rod 21b on an upper portion of a switch case 21a. The switch rod 21b has a base end rotatably supported by a housing 21a. It is urged to rotate by a spring or the like so that its tip faces upward. A contact terminal is interlocked with the base end of the switch rod 21b. When the switch rod 21b is inverted horizontally, the contact terminal is connected, and the stop switch 21 outputs an ON state signal. On the other hand, when standing up, the connection of the contact terminal is released, and the stop switch 21 is turned off.

Therefore, when the disc 3 is mounted on the disc music box 1, or when the music box is being played, as shown in FIG.
The switch rod 21b comes into contact with the lower surface of the disk 3 and is inverted, and an ON state signal is output.

Then, as shown in FIG. 8 (2), a hole 3a for stopping corresponding to the stop switch 21 is formed in the disk 3.
Is provided, so the performance of the first song is completed and the disc 3
When the hole 3a reaches a position directly above the switch rod 21b, the switch rod 21b enters the hole 3a and the switch rod 21b stands up, so that the stop switch 21 sends an off-state signal. , To the motor control circuit section. Next, based on this OFF signal, the motor control circuit unit reversely rotates the star wheel 12 after the overrun operation of continuing the rotation of the disk 3 for a predetermined period.
The alignment control for aligning the claw portions 12a, 12b, 12c, 12d is performed, and operation control is performed so that the motor M of the disk drive mechanism 5 is stopped.

Next, a disk used in the disk music box of the present invention will be described with reference to FIGS. 9 and 10.

In the initial state, the disk 3 of this example is
When the user arbitrarily sets the playing hole 4 on the disk 3 and is formed in a thin disk shape without the playing hole 4, the index 31 by an auxiliary display line for assisting this setting work is provided at least on the disk. It is provided on one side.

That is, as shown in FIG.
Is made of vinyl chloride or YUPO paper in the shape of a thin disk having a predetermined diameter, and as the index 31, a plurality of scale display lines 32 are formed concentrically along the radial direction, similarly to the circumference. A plurality of time signature display lines 33 are formed radially along the direction.

In the initial state of the disc 3, the playing hole 4 is not provided, and the user arbitrarily sets the playing hole 4. Therefore, disk 3
In addition, since it is formed in a thin disk shape using vinyl chloride or YUPO paper, which can be easily processed, the user can easily form the playing hole 4 by using a simple punching tool.

An index 31 for assisting and facilitating the setting of the playing hole 4 is described on at least one side of the disc 3,
The index 31 is composed of a scale display line 32 for assisting the scale setting to be pronounced and a time signature display line 33 for assisting the rhythm setting.

The scale display line 32 is concentrically formed corresponding to each music box valve body portion 17a of the music box sounding body.

As shown by the broken line in the figure, a plurality of the time signature display lines 33 are provided radially from the center of rotation of the disk 3 and are spaced from each other by a predetermined distance. That is, the intervals between the time signature display lines 33 are set in correspondence with the quarter notes of the music box performance. Therefore, by providing the playing holes 4 and 4 on each time signature display line 33, a rhythm corresponding to a quarter note can be obtained. Further, the playing hole 4 above the time signature display line 33 and the time signature display line 33 are adjacent to each other. By providing the performance hole 4 between the time signature display lines 33, the rhythm corresponding to the eighth note can be obtained. In this way, a desired rhythm can be obtained by appropriately setting the position of the playing hole 4.

The scale display line 3 which constitutes the index 31
2 and the time signature display line 33 are preferably formed for each scale and time signature, but the present invention is not limited to this and may have a simple configuration.

Further, by using an appropriate line shape and color display for the scale display line 32 and the time signature display line 33, not only each part can be easily confirmed but also the appearance design can be improved. it can.

Next, an example of using such a disk 3 will be described.

First, the disk 3 in the initial state in which the playing hole 4 is not provided is prepared, and the user refers to the index 31 composed of the scale display line 32 and the time signature display line 33,
Plot the melody you want to play on Disk 3. In order to make each of the plotted positions a playing hole, the playing holes 4 and 4 are set by using a simple punching tool as shown in FIG.

When the user mounts the disc 3 on the disc music box 1 and turns on the monitor switch, the music box performance by the disc 3 is started. In other words, the motor control circuit of the disc music box 1 drives the motor M in a predetermined manner, and the motor drives the disc 3 to rotate in the forward direction from the performance start position. Then, as the disc 3 rotates,
The playing holes 4 and 4 provided at predetermined positions on the disc 3 are
The corresponding claws 12a, 12b, 12 of the star wheel 12
The star wheel 12 is forcibly rotated by hooking c and 12d, and the music box sound is generated by flipping the music box valve 17a with the other claws 12a, 12b, 12c and 12d following the rotating star wheel 12. It

Finally, after the disk 3 makes one revolution, the music box performance ends. That is, by the motor control drive by the motor control circuit, after the star wheel 12 is aligned, the disc 3 is stopped at the initial rotation position where the music box performance starts.

As another method of using the disc according to this example, a famous music pattern or main melody is provided as a play hole in the disc in advance, and the latter half or a part of the play hole is not provided. Alternatively, the user may freely add a melody.

As described above, according to the disc music box of this embodiment, the disc is not provided with the playing hole and the disc is provided with the index for assisting the setting of the playing hole. You can create your own original disc. In this way, it is possible to enjoy the music box performance using the self-created disk as well as using the normal disk, so that the commercial value of the disk music box can be enhanced.

Moreover, since the music box can be played immediately using the produced original disc,
It is also suitable as a music teaching material.

[0058]

As described above, according to the first aspect of the present invention, the disk is rotated by the motor, and
In a disc music box in which a star wheel is guided to rotate in each playing hole provided in a disc and plays a melody by playing a music box valve with the star wheel, the disc is radially and concentrically formed from the center of rotation of the disc. A disc music box having a structure in which an index for forming a playing hole is provided on the disk. Further, in the invention according to claim 2 of the present application, in the invention according to claim 1, the radial index is a beat and the concentric circles. The shape-like index is a disc music box with a structure that indicates the scale.

Therefore, according to the present invention, a disc capable of playing its own melody is devised very easily and surely on the basis of the index for forming the playing hole which is provided radially and concentrically from the center of rotation of the disc. Is what you can do.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a schematic overall configuration of a disc music box according to this example.

FIG. 2 is an external perspective view showing the state of the disc music box related to the present specific example with no disc mounted.

FIG. 3 is an external perspective view showing the state of the disc music box engaging member and the disc pressing arm of the present example being opened.

FIG. 4 is a perspective view showing a gear train of a disc music box of the present specific example.

FIG. 5 is an exploded perspective view showing a star wheel and a star wheel shaft of the present specific example, with some parts omitted.

6A and 6B are diagrams for explaining the sounding operation of the disk music box of the present specific example, (1) shows a sounding preparation state, and (2) shows an initial state in which a star wheel claw is engaged with a playing hole of the disk. , (3) show a sounding state in which the music box valve is flipped by the claws of the star wheel, and (1) shows a state in which the sounding preparation is restored.

FIG. 7 is a front view showing a stop switch for detecting one rotation of the disk according to the present specific example.

FIG. 8 illustrates the operation of the stop switch of this example,
(1) is a side view showing a state during the rotation of the disk,
(1) is a side view showing a state in which one rotation of the disc is detected.

FIG. 9 is a plan view of a disk according to the present example, showing an initial state in which a playing hole is not provided.

FIG. 10 is a plan view of a disk according to the present example, showing a state in which playing holes are arbitrarily provided.

[Explanation of symbols]

 1 Disc Music Box 2 Music Box Main Body 3 Disc 3a Stop Hole 4 Playing Hole 5 Disc Drive Mechanism 6 Gear Train 7 Star Wheel Shaft 8 Disc Holding Arm 9 Disc Mounting Bracket 10 Supporting Material 11 Spacing Wheel Setting Star Wheel Partitioning Member 12 Star Wheel 12a Claw part 12b Claw part 12c Claw part 12d Claw part 13 Disk clamping roller 14 Supporting material 15 Holding roller shaft 16a Cylindrical body 16b Pressing roller 17 Music box sounding body 17a Music box valve part 21 Stop switch 21a Housing 21b Switch rod 31 Indicator 32 sound level Line 33 Time signature line 61 Worm gear 62 Shaft 62a First gear 62b Second gear 63a Third gear 63b Fourth gear 64a Gear 64b Disk pressing rotor 81 Base 82 Tip 82a Insertion hole 91 Protrusion 91 Groove M motor

Claims (2)

[Claims] 1. A disc music box in which a disc is rotated by a motor, and a star wheel is guided and rotated in each play hole provided in the disc to play a melody by playing a music box valve with the star wheel. The disc music box is characterized in that a play hole forming index is provided radially and concentrically from the center of rotation of the disc. 2. The disc music box according to claim 1, wherein the radial index indicates a time signature, and the concentric index indicates a musical scale.