JPH10268860A - Acoustic piano sound elimination driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an acoustic piano sound elimination driving device that stops a hammer right before strings when an acoustic piano is used as an electronic/acoustic piano. SOLUTION: A storage frame having a fitting substrate at a specific position is mounted on a bracket in the piano. On this storage frame, an electric motor provided with a gear in mounted. Through the rotation of this gear, a hammer shank is stopped from moving by a movable lever and a movement stop piece fixed to the movable lever. Further, an adjusting screw is engaged threadably with the side frame of the storage frame and a wire wound with a spring is coupled with the movable lever to make the movable stop piece movable and stop the hammer shank from moving. Further, an adjusting screw is engaged threadably with the side frame of the storage frame and an electromagnet is provided on the internal surface of one side frame, the movable stop piece is made movable together with the movable lever having a spring for restoration on the other side frame with the movable lever, thereby stopping hammer shank from moving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a live piano silencing drive device in which, when a live piano such as an upright piano is used as an electronic piano and a live piano, a movable hammer of the piano is stopped just before striking a string. It is about.

[0002]

2. Description of the Related Art Conventionally, in this kind of electronic piano, which is also used as an electronic piano, various types of silencer devices for silencing the volume of the raw piano have been scattered. There is a disadvantage that a silencer suitable for the model must be considered. In addition, when the muffler is freely attached to each manufacturer's product, the attachment is very troublesome and has a problem that it becomes very complicated.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
There was an inconvenient problem that only a mechanism that matches the model of the manufacturer could be installed. Therefore, the present invention solves the conventional inconvenience, and its main object is to provide a hammer that can be easily mounted on various types of raw pianos, regardless of the model and model of each manufacturer. Is provided so as to be surely stopped in front of a string.

[0004]

In order to achieve the above-mentioned object, a live piano silencing drive device according to the present invention is provided in which a hammer is rotated by a keyboard of a live piano and stops just before the hammer hits a string. In the mechanism, a storage frame having a mounting board is mounted at a predetermined position on a bracket inside the piano. The storage frame is provided with gears and a motor inside. A movable rod is connected to the gear via a movable shaft, and a movable stop piece for stopping the hammer shank fixed to the rotary shaft is fixedly connected to the movable rod. As another mechanism for stopping, a movable rod is suspended inside the storage frame, and an adjustment screw is screwed into one of the front and rear side frames of the storage frame.
Connect a wire with a spring to the movable rod,
The movable rod is stretched to be movable.
A movable rod is suspended inside the storage frame for the same purpose, and an adjusting screw is screwed into a side frame of the storage frame. An electromagnet is mounted on one inner surface of the side frame, and a restoring spring is interposed between the movable rod and the side frame on the other side frame.

[0005]

According to the first aspect of the present invention, when the performer wants to mute, the motor (4) is started.
A movable rod (7) is moved via a movable shaft (6) adjusted to a movable range by gears (5) and (5) having a deceleration action. The movable stop piece (9) fixed to the movable rod (7) is movably brought into contact with the hammer shank (11) side of the hammer (10), and stopped before the hammer (10) hits the string. When canceling the mute, the operation of the electric motor (4) is reversed so that the hammer shank (11) can be freely struck. In the second aspect, the hanging movable rod (7) is moved by pressing the spring (23) to the movable range using the pulling force of the wire (22) instead of the electric motor. As a result, the movable stop piece (9) fixed to the movable rod (7) rotates, and the movable stop piece (9) is movably brought into contact with the hammer shank (11) to stop the hammer (10) just before the string. Furthermore,
According to a third aspect of the present invention, in the muffler driving device, the movable rod (7) is pressed and moved toward the spring (23) by the magnetic repulsive force of the electromagnet (25) provided inside the storage frame (3), and is movable. The movable stop piece (9) fixed to the rod (7) rotates, and movably contacts the hammer shank (11) side so that the hammer (1) can move.
0) is stopped before the string.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a muffler driving device according to the present invention will be described with reference to the drawings. FIG. 1 discloses the interior of a commonly used piano, and FIGS. 1 shows a state in which a silencing drive device of the present invention is provided in a part of a bracket (1). On the bracket (1), a storage frame (3) having an attachment substrate (2) at a predetermined position substantially above is fixed. The storage frame (3) is provided with a motor (4) internally connected to a power cord (28), and the motor (4) has several reduction gears (5) (5). ) Are engaged. A movable shaft (6) is connected to an end of the gear (5), and a lower end of a movable rod (7) is connected to an end of the movable shaft (6). The movable rod (7)
Is fixed at its upper end to a shaft (16) attached to a rotating shaft bearing on the mounting substrate (2) and a movable stop piece (9) integrally formed with the shaft (16). Have been. The movable stop piece (9) is inclined to the side of the hammer shank (11) to which the hammer (10) is connected so as to be able to receive the contact. Reference numeral (12) indicates a piano dambar, (13) indicates a dambar lever, and (1)
4) shows a center rail, and (15) shows a hammer rail.

Next, the embodiment shown in FIGS. 4 and 5 is a storage frame (3) attached to a bracket (1), in which a movable rod (7) suspended inside the rotary shaft (8). ) Is stored movably. The storage frame (3) is provided with a side frame (20) and a side frame (20) at opposing positions, and the side frame (20) is provided.
An adjusting screw (21) for adjusting and stopping the movable range of the movable rod (7) is provided on one of them so as to be freely screwed. The movable rod (7) is connected at its lower end to a distal end of a wire (22) inserted through one side frame (20) by a fixing screw (24). A spring (23) for restoring the movable rod (7) is wound around the wire (22). The one shown in FIG. 5 shows a normal case, and the state where the movable rod (7) is pulled and the spring (23) is compressed corresponds to the mute state.

Further, in the embodiment shown in FIGS. 6 and 7,
A movable rod (7) is movably suspended inside the storage frame (3), and a side frame (20) and a side frame (20) of the storage frame (3).
The adjusting screws (21) and (21) for easily adjusting the movable range of the movable rod (7) are screwed together. An electromagnet (25) is attached to the inner surface of one of the side frames (20) to use the movable rod (7) by using magnetic repulsion. A restoring spring (23) is fixed to the other side frame (20) by being wound around the outer periphery of the adjusting screw (21) between the movable rod (7) and the movable rod (7). Reference numeral (28) indicates a power cord connected to the electromagnet (25) via the electric connection part (26). FIG. 7 shows a normal case, and the sound is muted when the movable rod (7) presses the spring (23).

[0009]

As described above, the sound deadening drive device for a piano according to the present invention is not affected by the model and model, as in the prior art, and is a convenient effect that the sound deadening device can be freely mounted on various live pianos. Also, since the space of the bracket is used, there is also an effect that the mounting of the silencer can be surely and easily performed. Then, when the live piano is muted by the player's selection, the electric motor in the storage frame is operated by the operation of the switch, and the movable rod and the movable stop piece are easily moved together with the movable shaft via the gear, so that the hammer shaking is performed. Has the effect of stopping the movement of the hammer and stopping the hammer reliably just before striking. Further, the wire spring mounted on the side frame of the storage frame has an excellent effect that the structure is very simple and the movable stop piece can be easily operated by utilizing the pulling force. Furthermore, since the electromagnet and the spring are mounted on the inner surface of the side frame of the storage frame, it can be easily operated by operating the switch, and the movable stop piece connected to the movable rod by accurately operating the movable rod is provided. It is movable and has the effect of stopping the hammer reliably before striking the hammer.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing the internal structure of a raw piano.

FIG. 2 is a partially cutaway perspective view of a case where a motor device is mounted on the bracket of the present invention.

FIG. 3 is an enlarged perspective view of an essential part of FIG.

FIG. 4 is a partially cutaway perspective view of the wire spring operating device of the present invention.

FIG. 5 is an enlarged vertical sectional side view of the present invention with a part removed from FIG. 4;

FIG. 6 is a partially cutaway perspective view of the electromagnet operating device according to the present invention.

FIG. 7 is an enlarged longitudinal sectional side view of the present invention in which a part is omitted in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Mounting board 3 Storage frame 4 Electric motor 5 Gear 6 Movable shaft 7 Movable rod 8 Rotating shaft 9 Movable stop piece 10 Hammer 11 Hammerjack 12 Dambar 16 Shaft 19 Side frame 20 Side frame 21 Adjusting screw 22 Wire 23 Spring 24 Fixing screw 25 Electromagnet

Claims (3)

[Claims] 1. A silencing drive device in which a hammer of a live piano stops before a string, a bracket (1) having a mounting board (2) at a predetermined position is mounted on a bracket (1) inside the piano. An electric motor (4) provided with gears (5) and (5) is provided inside the storage frame (3), and a movable rod (7) is mounted on the gears (5) and (5) via a movable shaft (6). And a movable stop piece (9) for stopping the movement of a hammer shank (11) fixed to a rotating shaft (8) is fixedly connected to the movable rod (7). Drive. 2. A movable rod (7) is suspended inside a storage frame (3) according to claim 1, and a side frame (2) of said storage frame (3) is opposed to said movable frame.
0) and at least one of the side frames (20), an adjusting screw (21) is screwed, and a wire (22) around which a spring (23) is wound is connected to the movable rod (7). The live piano silence driving device according to claim 1, wherein: 3. An adjusting screw (21) for suspending a movable rod (7) inside a storage frame (3) and facing a side frame (19) and a side frame (20) door of the storage frame (3). (21) are screwed together, an electromagnet (25) is provided on the inner surface of one of the side frames (20), and the movable rod (7) and the side frame (20) are mounted on the other side frame (20).
2. A drive device for silencing a live piano according to claim 1, wherein a restoring spring (27) is interposed between the device and the device.