JPS6315911Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard mechanism in an electronic musical instrument such as an electronic organ.

The keyboard mechanism in conventional electronic musical instruments uses a key return spring to return the key, but this spring only slightly changes the bending angle of the bent part of the keyboard frame to which one end is locked, and can be used over a wide range of It was not possible to change the repulsive force over a period of time, and therefore it was not possible to change the touch feel of the keys to a degree that was perceptible to the player.

This invention was made in view of the above points, and consists of a keyboard frame, a key arranged on the keyboard frame so as to be able to swing vertically, one end of which is locked to the key side, and the other end of which is locked to the one end. a key return spring that imparts a return habit to the key by being latched to the keyboard frame side with the key shifted in the front-back direction of the key;
By configuring at least one of the spring locking portions provided on the key and keyboard frame sides, respectively, with a plurality of spring locking portions arranged vertically at appropriate intervals and selectively locking one end of the key return spring. To provide a keyboard mechanism for an electronic musical instrument in which the direction of action of the elastic force of a key return spring can be changed to greatly change the touch feel of a key.

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a sectional view of a main part showing an embodiment of the keyboard mechanism of an electronic musical instrument according to the invention, and FIG. 2 is a plan view of the stop block shown in FIG. 1. In these figures, above the shelf board 1, keyboard mechanisms 2A and 2B each having a large number of vertically swingable keys 3 arranged in parallel on a keyboard frame 4 are arranged in two upper and lower stages. In this case, since the upper and lower keyboard mechanisms 2A and 2B are configured in exactly the same way, only the upper keyboard mechanism 2A will be described, and the description of the lower keyboard mechanism 2B will be omitted.

The keyboard frame 4 is formed into a frame shape with an open center and extends long in the direction in which the keys 3 are arranged side by side, and both ends of the keyboard frame 4 are fitted with set screws or the like on the inner surfaces of the clapboards 5 arranged on both sides of the keys 3. It is firmly fixed by means of A front rail 6 and a back rail 7, which are made of wood or the like and extend commonly to all the keys 3, are fixed to the front and rear ends of the keyboard frame 4, respectively. A plurality of front pins 8 and balance pins 9 are implanted on the upper surfaces of the front rail 6 and back rail 7, respectively, corresponding to each key 3.

The key 3 has a structure similar to the key touch mechanism of a general piano, and the upper end of the balance pin 9 corresponding to the key is inserted into a longitudinally long elongated hole 10 formed at the rear end. As a result, the front pin 8 is swingably supported in the vertical direction using the lower end opening of the elongated hole 10 as a rotational fulcrum, and the upper end of the front pin 8 is always engaged in the recess 11 formed on the lower surface of the front end. This prevents lateral vibration.
On the opposing left and right inner surfaces of the elongated hole 10 and the recess 11, felts are provided to sandwich and hold the balance pin 9 and the front pin 8, respectively, to prevent the key 3 from rattling and generating noise when the key is operated. 12
is glued.

A switch mounting recess 13 is formed on the front surface of the front rail 6, and a switch mounting/front panel 14 is disposed to close this recess 13. A switch 15 is housed in the switch mounting recess 13 on this switch mounting/front panel 14, and the upper end of the front panel 14 extends to the lower surface of the key 3 and extends almost rearward. bent horizontally. For this reason, key 3
A recess 16 is formed on the lower surface of the front end corresponding to the upper end bent portion 14a of the front panel 14,
This allows the key 3 to rotate downward. When the key 3 is rotated downward using the rear end as a rotational fulcrum during key depression, a buffer member 17 such as felt provided on the upper surface of the front rail 6
By coming into contact with this, downward rotation is restricted.

On the rear surface of the front rail 6, a plurality of stop blocks 18 are arranged in parallel in the longitudinal direction of the front rail 6 via one L-shaped metal fitting 19. Each stop block 18 is made of synthetic resin such as ABS and is formed for each octave as shown in FIG. Main body 18A
And, on the rear surface of this main body 18A, a pair of keys are provided for each key of the octave, protruding toward the rear.
A plurality of screw mounting holes 20 are formed at appropriate locations on the main body 18A, and a cross 21 for an upper limit stopper is fixed to the lower surface of the main body 18A over the entire length. has been done. The stop block 18 is integrally connected to the L-shaped fitting 19 by a set screw 22 that is inserted into the screw mounting hole 20 and screwed into the screw hole of the L-shaped fitting 19 and the front rail 6. is firmly fixed to the front rail 6.

A key return spring locking member 23 is fixed to the lower surface of the front end of each key 3 by a screw 24 in correspondence with the stop block 18. This key return spring locking member 23 is formed into a substantially T-shape by bending a metal plate, and consists of a vertical piece 23A and a horizontal piece 23B extending in the front-rear direction of the key 3. extends below the stop block 18 through between the protrusion 18B corresponding to the key 3 of the stop block 18 and the adjacent left or right protrusion, and has a lower end facing forward approximately. It is bent 90 degrees and its bent portion (engaging portion) 230a abuts the cross 21 from below, thereby forming the upper limit stopper of the key 3. On the other hand, the front end of the horizontal piece 23B is bent upward and fixed into a groove provided on the lower surface of the key 3, and the rear end is bent downward at a predetermined angle to form a bent piece (spring locking piece).
230b is provided with three spring locking portions A to C, each consisting of, for example, a recess (or a small hole), at appropriate intervals in the key pressing direction, that is, in the vertical direction.
One end 25a of a key return spring 25 made of a torsion coil spring is selectively locked in these spring locking portions A to C, and the other end 25b is located below the one end 25a to prevent a stop block. It is locked to a metal plate 26 fixed to the rear surface of 18. This key return spring 25 is caused by the weight of the key 3 to cause one end 2 of the key return spring 25 to
5a is pressed down and elastic force is stored in the coil portion 25c, so that the key 3 is always in the return direction.
In other words, a clockwise rotational habit is imparted. Therefore, the bent portion 230a of the upper limit stopper 23A
is usually pressed against the cross 21 from below and the key 3
is locked in an almost horizontal initial position. Said key 3
The key press stroke S is adjusted by changing the bending angle of the bending portion 230a, and the key touch feeling is adjusted by changing the elastic force of the key return spring 25 against the key 3, as will be described later. A part of the other end 25b of the key return spring 25 is inserted between a pair of protrusions 18B of the stop block 18 corresponding to the spring 25, so that the key return spring 25 can be operated on the left and right sides with both ends 25a and 25b as fulcrums. Directional swing is prevented.

A key switch frame 31 is fixed to the front surface of the back rail 7, and the frame 31 is bent into a substantially L shape and has a horizontal portion extending forward.A key switch 27 is disposed on the lower surface of this frame 31. There is. This key switch 27 is activated when the key 3 is pressed.
The actuator is configured to be actuated by an actuator (not shown) that lowers together with the actuator. A key catch 28 and a back rail reinforcing metal fitting 29 are fixed to the rear surface of the back rail 7 to prevent the key 3 from coming off the balance pin 9. In addition, 30
is a cross interposed between the key 3 and the back rail 7.

In such a configuration, the elastic force A of the key return spring 25 is determined by the positional relationship between both ends 25a and 25b, and is divided into a vertical component B and a horizontal component C, as shown in FIG. As shown in Figures a to c, the repulsive force A is tilted as the key stroke S changes, so its vertical component B changes as B ₁ →B ₂ →B ₃ .
Further, as shown in FIG. 5, this vertical force B acts against the weight G of the key 3 (B>G), giving the key 3 a turning habit. This vertical component B also changes by selectively locking one end 25a of the key return spring 25 to the spring locking portions A to C. That is, as the one end 25a moves from the upper spring locking part A to the lower spring locking parts B and C, the elastic force A becomes more inclined as shown in FIGS. 4a to 4c. The vertical component force changes greatly, and as a result, the touch feeling of the key can be changed to a degree that is perceptible to the fingers, as shown in FIG. Furthermore, Fig. 5 is a diagram showing the relationship between the vertical component force B and the key stroke S, and Fig. 6 is a diagram showing the change in key touch feeling, where the vertical axis represents the vertical component force B.
The horizontal axis shows the key stroke S. And _T1 to _T3
The one end 25a of the key return spring 25 is connected to the spring locking part I~
This is the change in the key touch feeling when the key is locked in C.

FIG. 7 is a vertical sectional view of main parts showing another embodiment of this invention, and FIGS. 8 a to 8 d are a front view, a plan view, a sectional view taken along the line, and - of the stop block shown in FIG. 7.
FIG. Components in the figure that are the same as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. A stop block 40 is fixed to the front surface of the front rail 6 via an L-shaped metal fitting 19. This stop block 40 is made of synthetic resin and is formed long enough to accommodate a plurality of keys 3, and has a plurality of stopper insertion holes 41a, 41b penetrating the front and rear surfaces and the top surface corresponding to each key 3, respectively.
A plurality of spring insertion holes 43 are formed in partition walls 42a, 42b, which partition these stopper insertion holes 41a, 41b, so as to penetrate from the front and rear surfaces.
a, 43b... The stop block 40 is connected to the L-shaped fitting 19 by a set screw (not shown) inserted into the screw mounting hole 44.
and is integrally fixed to the front rail 6.

A key return spring locking member 45 is fixed to the lower surface of the key 3 in correspondence with the stop block 40. This locking member 45 consists of a vertical piece 45A and a horizontal piece 45B, which constitute an upper limit stopper, as in the previous embodiment.
The vertical piece 45A is inserted from above into the stopper insertion hole 41a corresponding to the key 3 of the stop block 40, and its lower end is bent forward approximately 90 degrees to form a bent portion ( Engagement part) 4
6 engages with the lower surface of a protrusion 47 provided on the front surface of the stop block 40. On the other hand, a bent piece 48 bent downward at a predetermined angle is provided at the front end of the horizontal piece 45B, and this bent piece 48 has a plurality of spring locking parts 49 as in the above embodiment. The same is provided. One end of the key return spring 25 is selectively locked in any one of the plurality of spring locking parts 49, and the other end is in the spring insertion hole 43a of the stop block 40 corresponding to the key 3. The L-shaped metal fitting 19 is inserted through the L-shaped metal fitting 19.

Incidentally, in each of the above-mentioned embodiments, a case has been described in which a plurality of spring locking portions are provided on the key return spring locking member, but this invention is not limited to this in any way, and the spring locking portions are provided on the keyboard frame 4 side. Of course, it may be provided on the metal plate 26, the L-shaped fitting 19, or on both the key and keyboard frame sides.

Furthermore, according to the embodiment described above, it is possible to easily change the touch feel of the keys of the upper and lower keyboard mechanisms 2A and 2B.

As explained above, according to the keyboard mechanism of the electronic musical instrument according to the present invention, at least one of the spring locking portions provided on the key and the keyboard frame side is arranged in plural at appropriate intervals in the vertical direction. ,
Since one end of the key return spring is selectively locked in these spring locking parts, the key touch feeling can be easily and easily changed to a sufficiently perceptible degree, and it is also possible to change the key touch feeling to a sufficiently perceptible level. In electronic musical instruments that have a mechanism, it is possible to change the key touch feeling for each stage, and the practical effects of this are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main part showing an embodiment of the keyboard mechanism according to this invention, Fig. 2 is a plan view of the stop block shown in Fig. 1, and Figs. 3 and 4 show the feeling of key touch. Figure 5 is a diagram showing the relationship between vertical component force B and key stroke S, Figure 6 is a diagram showing changes in key touch feeling, and Figure 7 is a diagram showing the relationship between vertical component force B and key stroke S. Main part vertical sectional view showing the embodiment, FIG. 8a
-d are a front view, a plan view, a cross-sectional view taken along the - line, and a cross-sectional view taken along the - line, respectively, of the stop block shown in FIG. 2A... Upper keyboard mechanism, 2B... Lower keyboard mechanism, 3... Key, 4... Keyboard frame, 23, 4
5... Key return spring locking member, 25... Key return spring, 49, A, B, C... Spring locking portion.

Claims (1)

[Scope of utility model registration request] a keyboard frame; a key disposed on the keyboard frame so as to be vertically swingable; one end thereof is locked to the key side, and the other end is shifted in the front-rear direction of the key with respect to the one end and is attached to the keyboard frame side; A key return spring that imparts a return behavior to the locked key, and at least one of the spring locking portions provided on the key and the keyboard frame, respectively, are arranged in parallel at appropriate intervals in the vertical direction. A keyboard mechanism for an electronic musical instrument, comprising a plurality of pieces that selectively lock one end of the key return spring.