JPH0669996U - Keyboard drive for automatic performance - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object to provide a keyboard drive device for automatic performance, which enables a keyboard operation according to a musical piece to be played with a simple structure. [Structure] A rotary drum 3 provided along the keyboard row 8,
A rotary drum 4 for rotating the rotary drum 3, and a large number of protrusions 2a are arranged in the circumferential direction of the rotary drum 3 for key-pressing each keyboard 8a of the keyboard row 8 in response to a musical piece to be played. Is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a keyboard driving device for automatic performance, in which each keyboard is pressed in response to a musical piece when automatically playing a piano toy or the like.

[0002]

[Prior art]

 Conventionally, there are no piano toys and the like that have a built-in keyboard drive for automatic performance.However, with a general piano keyboard drive, actuators such as solenoids are controlled by mycon control that corresponds to the music being played. It is known that the keys are operated to activate the keys.

[0003]

[Problems to be solved by the device]

 As described above, simply applying the conventional keyboard drive device for automatic performance to a piano toy to a piano toy complicates the device configuration and raises the cost.

An object of the present invention is to provide a keyboard drive device for automatic performance, which enables a keyboard operation according to a music piece to be played with a simple structure.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a rotary drum provided corresponding to the width of the keyboard row and a rotating means for rotating the rotary drum, and plays each keyboard of the keyboard row in the circumferential direction of the rotary drum. It is characterized in that a large number of protrusions for key-depressing operation are provided in correspondence with the above.

In this case, a moving mechanism for moving the rotating drum in the axial direction according to the rotation of the rotating drum is further provided, and the projecting piece portion is arranged in a spiral shape corresponding to the movement in the axial direction. Is preferred.

[0007]

[Action]

 When the rotating drum is rotated by the rotating means, the projecting portion of the rotating drum causes the keyboard to be pressed by a cam or a flipping action. In the circumferential direction of the rotating drum, the projecting pieces are arranged in correspondence with the musical pieces to be played, and as the rotating drum rotates, each key is automatically pressed according to the desired musical piece. .

In this case, a moving mechanism for moving the rotating drum in the axial direction according to the rotation of the rotating drum is further provided, and correspondingly, the projecting piece portion is arranged in a spiral shape, whereby The playing time can be lengthened, and the rotary drum can be formed with a small diameter.

[0009]

【Example】

 An automatic performance keyboard driving device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. This keyboard drive device is applied to a piano toy, and automatically presses the keyboard of the piano toy in accordance with the performance music. FIG. 1 is an exploded perspective view showing the overall configuration of the keyboard drive device, and FIG. 2 is a partial cutaway view of a main part of the keyboard drive device, in which the left half is viewed from the side and the right half is viewed from the top. It is a figure. As shown in both figures, this keyboard driving device 1 includes a rotary drum 3 having a large number of operating protrusions 2a, which are projecting pieces, planted on the outer peripheral surface thereof, and a drive device 4 (rotating step) for rotating the rotary drum 3. ), And a lateral movement mechanism 5 for laterally moving the rotary drum 3 in the axial direction in association with the rotation of the rotary drum 3, are housed in a drum case 6. When the rotary drum 3 is moved laterally while being rotated by the drive device 4 and the lateral movement mechanism 5, the operating projections 2a of the rotary drum 3 appropriately press the respective keys 8a via the push-up pins 7. By this key depression operation, the keyboard switch 9 abutted on the lower surface of the front portion of the keyboard 8a is turned on and off, and a sounding device (not shown) connected to the keyboard switch 9 is operated to perform a desired automatic performance. Be seen.

In this case, of course, the structure may be such that the sounding plate is directly hit with the keyboard 8a to perform the performance, or the sounding device and the driving device 4 are synchronized and the sounding device plays the performance. The drive device 4 may have a structure for operating the keyboard 8a.

The rotating drum 3 has a length substantially corresponding to the width of the keyboard row 8 composed of eight keyboards 8 a, and is provided along the length thereof, and has a cylindrical shape in which the operating protrusions 2 a are planted. Drum main body 21, a pair of bearing portions 22 and 22 attached to both ends of the drum main body 21, a screw portion 23 extending from one (right side in the figure) bearing portion 22, and a screw portion. 23 and an input gear 24 attached to the tip of 23.

The actuating projections 2 a constitute eight sets of actuating projection rows 2 corresponding to each keyboard 8 a, and the actuating projections 2 a of each actuating projection row 2 are rotated by the drive device 4 and laterally moved by the lateral movement mechanism 5. Corresponding to the combined movement with the movement, the drum body 21 is spirally arranged in the circumferential direction of the outer peripheral surface. The arrangement of the operation protrusions 2a of each operation protrusion row 2 corresponds to the key pressing operation of each keyboard 8a corresponding to the desired musical piece, and the circumferential length of the operation protrusions 2a corresponds to the key pressing time. The interval between the adjacent actuating projections 2a in the circumferential direction corresponds to the key release time. The actuating projection 2a is abutted on the lower surface of the rear portion of the keyboard 8a via the push-up pin 7, and the cam action of the actuating projection 2a on the push-up pin 7 causes the keyboard 8a to center around the fulcrum 10 of the intermediate portion. A seesaw exercise is performed, that is, a key is pressed.

The bearing portion 22 is slidably fitted to the drum case 6 and allows the rotation of the rotary drum 3 by the drive device 4 and the axial movement of the rotary drum 3 by the lateral movement mechanism 5 (FIG. 2). reference). The screw portion 23 constitutes a part of the lateral movement mechanism 5 which will be described in detail later, and the input gear 24 constitutes an input portion for the power from the drive device 4.

The drive device 4 includes a drive motor 31 for driving the rotary drum 3, a worm 32 attached to a drive shaft 31 a of the drive motor 31, a worm wheel 33 meshing with the worm 32, and a worm wheel 33 coaxially with the worm wheel 33. It is composed of a fixed small gear 34, which meshes with the input gear 24 of the rotary drum 3. When the drive motor 31 rotates, the reduction drum train including the worm 32, the worm wheel 33, the small gear 34, and the input gear 24 causes the rotary drum 3 to rotate at a predetermined rotation speed. Further, the small gear 34 is formed to be long in the axial direction, and allows the input gear 24 to move laterally while maintaining the meshing state with the input gear 24 against the lateral movement of the rotary drum 3. .

The lateral movement mechanism 5 is configured by a screw mechanism including a screw portion 23 of the rotary drum 3 and an engagement protrusion 11 that is engaged with the screw portion 23 and fixed to the drum case 6. (See Figure 2). When the rotary drum 3 is rotated by the driving device 4, the engagement protrusion 11 on the fixed side acts on the screw portion 23 of the rotary drum 3, and the rotary drum 3 laterally moves in the axial direction. That is, the rotary drum 3 rotates so as to draw a spiral with respect to the push-up pin 7 and the keyboard 8a. The return of the rotary drum 3 to the original position is performed by lowering the entire keyboard drive device 1 with respect to the keyboard 8a by a mechanism (not shown) and then reversing the drive motor 31.

The drum case 6 is formed of resin or the like in a “U” shape, and eight cutout portions 6 a corresponding to each keyboard 8 a of the keyboard row 8 are formed on one side edge portion. . Although not shown, a protrusion formed on the lower surface of the keyboard 8a is engaged with the notch 6a to prevent lateral movement of the keyboard 8a. As shown in FIG. 2 (not shown in FIG. 1), a lid 12 is attached to the drum case 6, and the push-up pin is inserted into a through hole 12a formed in the lid 12. 7 faces and guides the up and down movement.

Next, a modified example of the above embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 shows a modification around the actuating protrusion 2a, and FIG. 4 shows a modification around the rotary drum 3. In the modification of FIG. 3, the actuating protrusion 2a is formed in a pin shape, and the rotating actuating protrusion 2a directly or indirectly flips the keyboard 8a to perform a key depression operation. Therefore, the key pressing time is adjusted by the protruding length of the operating protrusion 2a.

In the modification of FIG. 4, a spiral groove is cut on the outer peripheral surface of the rotary drum 3 to form a so-called cylindrical cam, and the operation protrusion 2 a is formed on the bottom surface of the cam groove 13. With this configuration, the lateral movement mechanism 5 can be configured by the cam groove 13 and the push-up pin 7, and the keyboard 8a can be pressed by the operation protrusion 2a via the push-up pin 7. it can. Although not shown, if a return groove having no actuating protrusion 2a is provided in the cam groove 13, the rotation of the drive motor 31 is continued for a short period of time after the performance is completed, so that the rotary drum 3 is returned to its original position. be able to.

In this modification, a convex portion may be formed on the side surface of the cam groove 13 and used as the operating protrusion 2a. In this case, there is a cam action for laterally moving the push-up pin 7, so a link or the like is provided between the push-up pin 7 and the keyboard 8a, and this lateral movement is converted into vertical movement to move the keyboard 8a. Press the key. Further, the lateral movement mechanism 5 may be configured by a plate cam or a link mechanism that is in contact with the end of the rotary drum 3.

As described above, according to the present embodiment, the rotary drum 3 having the actuating protrusions 2a spirally arranged corresponding to the musical piece to be played is circumferentially moved laterally while being rotated. Since the keyboard 8a is pressed by the cam action of the actuating protrusion 2a, one rotation of the rotary drum 3 does not correspond to one cycle of the performance, and a long musical piece or a plurality of musical pieces can be played. However, it is possible to automatically press each keyboard 8a in accordance with the musical piece being played. At the same time, since one rotation of the rotary drum 3 is not one cycle of performance, the rotary drum 3 can be configured to have a small diameter, that is, to be compact. Moreover, since the rotary drum 3 has a simple structure, it is possible to reduce malfunctions and the cost can be reduced.

In the present embodiment, the case where the present invention is applied to a piano toy has been described, but it can be applied to other keyboard musical instrument toys, ornaments such as piano figurines, and general keyboard musical instruments. Needless to say.

[0022]

[Effect of device]

 As described above, according to the keyboard driving device of the present invention, the projecting piece is arranged in the circumferential direction of the rotating drum so as to correspond to the musical piece to be played, and the keyboard is pressed by the cam action and the flipping action of the projecting piece. Since the keys are operated, the keyboard can be automatically pressed in response to the musical piece to be played with a simple structure, and a simple and low-cost device can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an overall configuration of a keyboard driving device for automatic performance according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a main part of the keyboard driving device of the embodiment when the left half part is viewed from the plane from the right half part side surface.

FIG. 3 is a side view of a first modified example of the keyboard driving device of the embodiment.

FIG. 4 is a front view of a second modified example of the keyboard driving device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 keyboard drive device 2 actuation projection row 2a actuation projection 3 rotating drum 4 drive device 5 lateral movement mechanism 8 keyboard row 8a keyboard

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location G10F 1/02 A 6821-5H

Claims (2)

[Scope of utility model registration request] 1. A rotary drum provided along a keyboard row,
Rotating means for rotating the rotary drum, and a plurality of protrusions for arranging the keys of the keyboard row in a circumferential direction of the rotary drum in response to musical pieces to be played are arranged. A keyboard drive for automatic performance. 2. A moving mechanism for moving the rotating drum in the axial direction in accordance with the rotation of the rotating drum is further provided, and the projecting piece is arranged in a spiral shape corresponding to the movement in the axial direction. The keyboard drive device for automatic performance according to claim 1, wherein: