JPH1049145A - Key drive - Google Patents

Abstract

(57) [Summary] [Problem] To facilitate installation work without taking time and effort. When an electromagnetic solenoid is attached, an electromagnet is attached to a lower surface of a keyboard chassis, and a key is attached to an upper surface of the keyboard chassis.
The plunger 43 is housed in the electromagnet 42 through the key 23 and the plunger insertion holes 23a, 22a formed in the keyboard chassis 22. Therefore, there is no need to perform the mounting operation in the state of holding by hand as in the related art, and the mounting operation can be easily performed without taking time and effort.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a key driving device for automatically playing a keyboard instrument.

[0002]

2. Description of the Related Art Some keyboard musical instruments such as electronic pianos and acoustic pianos have a key drive for automatic performance. FIG. 2 shows an example of such a key driving device. In this key driving device, a plurality of keys 2 are rotatably mounted on an upper surface side of a keyboard chassis 1, and an electromagnetic solenoid 3 is mounted for each key 2 on a lower surface side of the keyboard chassis 1. In this case, the electromagnetic solenoid 3 includes an electromagnet 4 and a plunger 5 movably housed in the center of the electromagnet 4. Among them, the electromagnet 4
Is mounted on a substantially U-shaped bracket 7 mounted on a lower surface of the keyboard chassis 1 via a support member 6 such that the axis of the plunger 5 is substantially vertical. The upper end of the plunger 5 is projected onto the keyboard chassis 1 through a plunger insertion hole 1a formed in the keyboard chassis 1,
The flange 8 provided at the upper end of the plunger 5
Are locked by a substantially L-shaped locking portion 9 provided on the lower surface of the.

[0003]

However, in such a conventional key driving device, when the electromagnetic solenoid 3 is attached to each key 2, the upper end of the plunger 5 is inserted into the plunger insertion hole 1a formed in the keyboard chassis 1. And a flange portion 8 provided on an upper end portion of the plunger 5 and a locking portion 9 provided on a lower surface of the key 2.
Since the bracket 7 is attached to the support member 6 in this state, the key 2 is in the way so that the locking portion 9 cannot be seen, and the mounting operation must be performed in a hand-grip state. And it took time. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily perform an attaching operation without taking time and effort.

[0004]

According to the present invention, a plurality of keys rotatably provided on a keyboard chassis and a plunger in an electromagnet provided below the keyboard chassis are provided on the keys and the keys from above the keys. It has an electromagnetic solenoid housed through a plunger insertion hole formed in a keyboard chassis, and a push-down tool provided on an upper end of the plunger on the key.

According to the present invention, when the electromagnetic solenoid is mounted, after the electromagnet is mounted under the keyboard chassis,
It is sufficient to mount the key on the keyboard chassis and store the plunger in the electromagnet via the key and the plunger insertion hole formed in the keyboard chassis, and it is not necessary to perform the mounting work in the state of holding the hand as in the conventional case, The mounting work can be easily performed without taking much time.

[0006]

FIG. 1 is a sectional view showing a main part of an electronic keyboard instrument to which an embodiment of the present invention is applied. In this electronic keyboard instrument, a sheet metal keyboard chassis 22 is mounted on a not-shown instrument body case via a support member 21. A plurality of keys (white keys and black keys, but only white keys are described) 23 made of synthetic resin are arranged in parallel on the upper surface side of the keyboard chassis 22. At the rear end of the upper plate 24 of the key 23, a substantially U-shaped locking portion 25 is provided.
A spring pressing projection 26 is provided at a predetermined position on the lower surface of the rear end. Then, the key 23 is inserted into a locking hole 27 formed in the vertical portion of the rear end of the keyboard chassis 22 with the locking portion 25, and the spring pressing projection 26 is disposed on the keyboard chassis 22 below the return portion. By abutting on the spring 28, the return spring 28 can be vertically rotated around the locking portion 25 by elastic deformation.

At the center of the lower surface of the key 23, first and second switch pressing projections 29 and 30 having a cross shape in a cross section are integrally provided. Push button type first and second rubber switches 31 and 32 are arranged below the first and second switch pressing projections 29 and 30, respectively. These rubber switches 31 and 32 are provided on a circuit board 33 attached to the lower surface of the keyboard chassis 22, and are arranged in stupid holes 34 and 35 formed in the keyboard chassis 22.

The key 23 is urged upward by the spring force of the return spring 28 and the elastic force of the rubber switches 31 and 32. The L-shaped stopper piece 37 passes through a stupid hole 38 formed in the keyboard chassis 22 and abuts on a belt-shaped upper limit stopper 39 made of felt or the like provided on the lower surface of the keyboard chassis 22 so that a predetermined initial position ( (Upper limit position). At a predetermined position at the front end of the keyboard chassis 22, there is provided a substantially L-shaped key guide 40 for preventing the key from laterally swaying and guiding the key up and down. A belt-shaped lower limit stopper 41 made of felt or the like for restricting the lower limit position of the key 23 is provided at another predetermined position of the front end portion of the keyboard chassis 22 by abutting the lower end of the stopper piece 37. .

On the lower surface of the keyboard chassis 22, an electromagnetic solenoid 41 is provided for each key 23. In this case, the electromagnetic solenoid 41 includes an electromagnet 42 and a plunger 43 movably housed in the center of the electromagnet 42. The electromagnet 42 is mounted on a substantially U-shaped bracket 45 mounted on a support member 44 mounted on the lower surface of the circuit board 33 so that the axis of the plunger 43 is substantially vertical. At predetermined positions of the circuit board 33, the keyboard chassis 22, and the key 23 corresponding to the center of the electromagnet 42, plunger insertion holes 33a, 22a,
3a are formed. The plunger 43 is inserted into the electromagnet 42 from the upper surface side of the key 23 through the plunger insertion holes 23a, 22a, 33a. An E-ring (pressing tool) 4 is provided at the upper end of the plunger 43 on the key 23.
6 is attached. A ring-shaped buffering member 47 made of felt or the like is provided on the upper surface of the key 23 around the plunger insertion hole 23a to reduce an impact when the E-ring 46 collides with the key 23. Above each plunger 43, a plunger stopper 48 for preventing the plunger 43 from floating is provided. The plunger stopper 48 is formed of a band-shaped metal plate or the like, one end of which is bent in an L shape and screwed to the rear end of the keyboard chassis 22, and the other end is horizontally projected above the plunger 43. I have. In this case, a buffering member 49 made of felt or the like is provided on the lower surface of the other end of the plunger stopper 48 to reduce the impact when the plunger 43 collides, and a predetermined distance is provided between the buffering member 49 and the plunger. A gap is provided. A cover 50 for blindfolding is provided above the plunger stopper 48.

Next, the operation of the electronic keyboard instrument configured as described above will be described. First, when a current is supplied to the electromagnetic solenoid 41, the electromagnet 42 of the electromagnetic solenoid 41 to which the current is supplied attracts and pulls the plunger 43, and the E-ring 46 pushes the key 23 downward. As a result, the key 23 is pressed against the spring force of the return spring 28 and the elastic force of the rubber switches 31 and 32. Then
The first and second switch pressing projections 29 and 30 respectively press the first and second rubber switches 31 and 32,
Thus, the first and second rubber switches 31 and 32 are sequentially turned on with a time difference. And the second
By turning on the rubber switch 32, key-on data for instructing the tone generator (not shown) to start generating a musical tone is obtained, and the data relating to the key pressing speed, that is, the tone characteristics such as the volume and tone of the musical tone are initially controlled by the time difference. Initial touch data is obtained. Next, when the supply of current to the electromagnetic solenoid 41 is stopped,
The electromagnet 42 stops attracting the plunger 43, whereby the key 23 is returned to the original initial position by the spring force of the return spring 28 and the elastic force of the rubber switches 31 and 32.

As described above, in this electronic keyboard instrument, when the electromagnetic solenoid 41 is mounted, the electromagnet 42 is mounted on the lower surface side of the keyboard chassis 22 and then the keyboard chassis 22 is mounted.
The key 23 is attached to the upper surface side of the
It is only necessary to house the electromagnet 42 through the plunger insertion holes 23a, 22a formed in the keyboard chassis 22, and it is not necessary to perform the mounting work in the state of holding by hand as in the conventional case, and it is easy without time and effort. Mounting work can be performed.

In the above embodiment, the E-ring 46 is provided at the upper end of the plunger 43 as a depressing tool.
However, the present invention is not limited to this. For example, a flange may be integrally provided at the upper end of the plunger 43. In the above embodiment, the present invention is applied to an electronic keyboard instrument. However, the present invention is not limited to this, and can be applied to an acoustic keyboard instrument.

[0013]

As described above, according to the present invention, when an electromagnetic solenoid is mounted, an electromagnet is mounted under the keyboard chassis, then a key is mounted on the keyboard chassis, and the plunger is formed on the key and the keyboard chassis. It is sufficient to house the device in the electromagnet through the inserted plunger insertion hole, and it is not necessary to perform the mounting operation in the state of holding by hand as in the related art, and the mounting operation can be easily performed without much labor and time.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electronic keyboard instrument to which an embodiment of the present invention is applied.

FIG. 2 is a sectional view of a conventional keyboard instrument.

[Explanation of symbols]

 22 Keyboard Chassis 23 Key 41 Electromagnetic Solenoid 42 Electromagnet 43 Plunger 22a, 23a Plunger Insertion Hole

Claims (1)

[Claims] 1. A plurality of keys rotatably provided on a keyboard chassis, and a plunger inserted into an electromagnet provided below the keyboard chassis from above the keys and the plunger formed on the keyboard chassis. A key driving device comprising: an electromagnetic solenoid housed through a hole; and a depressing device provided on an upper end of the plunger on the key.