JPH0547836B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a keyboard device for an electronic musical instrument, and in particular to a keyboard device for preventing keys from popping out and falling off due to the spring force of a return spring during a removal operation. This is an improved version.

[Conventional technology]

Traditionally, keyboard devices for electronic musical instruments such as electronic organs have a return spring mounted between the key and the keyboard frame, and the spring rotates and returns the pressed key to its initial position. ing. In this case, the key is rotated by engaging the concave portion of the rotation fulcrum provided at the rear end with one end edge of the engagement hole provided in the keyboard frame, using this one end edge as the rotation fulcrum. Figure 12 shows this type of keyboard device (Japanese Patent Application Laid-Open No. 58-98784)
This shows a conventional example of
The key (black key) 1 is integrally formed of synthetic resin, has a U-shaped cross-section so that the lower surface is open, and the lower surface of the rear end has a rotation fulcrum portion with a recess 2 in the front substrate. 3 is integrally provided in a protruding manner, and the rotation fulcrum portion 3 is inserted from above into an engagement hole (engaging portion) 5 formed at the rear end portion of the keyboard frame (key support member) 4, so that the recess 2 is formed. By engaging with the front edge of the engagement hole 5, it is arranged on the keyboard frame 4 so as to be freely rotatable in the vertical direction using the front edge as a rotational fulcrum, and is rotated clockwise by the return spring 6. It has been given a return habit. The key 1 also has an integrally L-shaped stopper 7 vertically disposed on the lower surface of the front end.
The bent portion 7a at the lower end of the stopper 7 is inserted into a through hole 8 provided at the front end of the keyboard frame 4 so as to be vertically movable, and normally comes into contact with the upper edge of the through hole 8 by the force of the return spring 6. As a result, the key 1 is locked in a substantially horizontal initial position.

The return spring 6 is made of a band-shaped flat spring,
A spring locking portion 9 whose one end 6A is provided inside the key 1
The other end 6B is inserted and locked into a spring locking portion 10 provided on the keyboard frame 4. In this case, the return spring 6 maintains a flat state in its natural state before being assembled, and the return spring 6 maintains a flat state between the key 1 and the keyboard frame 4.
When the key 1 is inserted between the two, it is buckled into an arched shape as shown in the figure, and the reaction force of the spring 6 caused by this deformation gives the key 1 a return habit.
is urged forward to press the recess 2 into contact with the front edge of the engagement hole 5.

A spring locking piece 12 is integrally provided vertically at the rear end of the lower surface of the key 1 in correspondence with the other end 6B of the return spring 6. This spring locking piece 12 temporarily locks the other end 6B of the return spring 6 as shown in FIG. 13 before the key 1 is attached, and when the key 1 is set on the keyboard frame 4. The other end 6B extends from the spring locking piece 12 to the spring locking portion 1 of the keyboard frame 4.
0, and conversely, the spring locking piece 12 receives the other end 6B from the spring locking portion 10 during the removal operation.

That is, the return spring 6 is connected to the spring locking portion 9 of the key 1.
When the bent part 7a of the stopper 7 is inserted into the through hole 8 while temporarily fixed between the spring locking piece 12 and the key 1 is gradually lowered to the rear end of the key 1, the lower end of the spring locking piece 12 and the rotation The fulcrum portion 3 is inserted into the slit groove 14 and the engagement hole 5 of the spring locking portion 10, respectively.
At this time, the other end 6B of the return spring 6 is attached to the spring locking portion 1.
When the key 1 is moved backward against the spring 6 while being hooked on the stepped portion 15 of the key 1, the rotation fulcrum portion 3 corresponds to the engagement hole 5 and falls into the hole 5. Then, the key 1 is moved forward by the reaction force of the spring 6, so that the recess 2 of the rotation fulcrum 3 is pressed against the front edge of the engagement hole 5, and the key 1 is set on the keyboard frame 4.

On the other hand, when removing it from the keyboard frame 4, the operation described above may be reversed. That is, after the key 1 is moved back against the spring 6 to release the engagement between the recess 2 and the front edge of the engagement hole 5, the key 1 is rotated counterclockwise about the stopper 7. When the fulcrum part 3 is pulled out from the engagement hole 5, the lower end of the spring locking piece 12 comes into contact with the other end 6B of the spring 6 and is received from the spring locking part 10.

Therefore, the keyboard device having such a structure has the advantage that the work of assembling the key 1 and the return spring 6 is simple.

Note that when the front end of the key 1 is pressed against the return spring 6, the key 1 rotates downward in the counterclockwise direction using the front edge of the engagement hole 5 as a rotation fulcrum, and as a result, the actuator By operating a key switch (not shown) 17 disposed on the lower surface of the keyboard frame 4, an electronic sound corresponding to the key 1 is produced.

In addition, 18 is a bending piece that prevents the key 1 from wobbling in the left-right direction, and 19 is a bending piece that is interposed between the rear end surface of the key 1 and the bending part 20 provided at the rear end of the keyboard frame 4. , a key fall prevention member made of rubber or the like that restricts and prevents the key 1 from moving backwards, and this prevention member 1
9 is temporarily removed to enable the key 1 to be moved back when the key 1 is removed.

[Problem that the invention seeks to solve]

However, in such conventional keyboard devices,
The shape of the rotation fulcrum part 3 is simple, and the recess 2 and the engagement hole 5
When the rotation fulcrum part 3 is disengaged from the engagement hole 5, it is easy to come out of the engagement hole 5. Therefore, when removing the key 1 from the keyboard frame 4, the key 1 is moved backward and the rear end is rotated upward, and the return spring 6 is removed. At the moment when the other end 6B is transferred from the spring locking part 10 to the spring locking piece 12, the key 1 sometimes pops upward forcefully due to the spring force of the spring 6.
When the key 1 falls from the top of the keyboard frame 4 and the key 1 flies upward, the spring 6 is not received by the locking piece 12 of the key 1 and easily falls off, resulting in the relatively small spring being lost. There were also disadvantages such as the key 1 other than the removed key 1 getting stuck between the frame and the frame, making it difficult to take it out.

[Means for solving problems]

The keyboard device for an electronic musical instrument according to the present invention has been made in order to solve the above-mentioned problems, and the keyboard device of the electronic musical instrument according to the present invention has been made in order to solve the above-mentioned problems. A key disposed on a key support member so as to be freely rotatable in the vertical direction, one end of which is engaged with a spring engagement portion provided on the key, and the other end of which is engaged with a spring engagement portion provided on the key support member. a return spring that imparts a return habit to the key when locked and at the same time presses the recessed portion against one end edge of the engaging portion; a pop-out prevention protrusion provided on the key; and the key support member. and a protrusion opposing part for preventing the pop-out, and the protrusion for preventing the pop-out and the opposing protrusion for preventing the pop-out are located apart from each other by a predetermined distance when the key is attached, and the protrusion for preventing the pop-out is located at a position separated by a predetermined distance when the key is attached. When the concave portion of the rotation fulcrum is disengaged from the engagement portion of the key support member against the pressing force of the return spring, the key moves a predetermined distance according to the return force of the return spring. They are in a positional relationship where they are in contact with each other.

[Operation and effects of the invention]

In this invention, when the key is taken out, the concave portion of the pivot point of the key is removed from the engaging portion of the key support member against the pressure of the spring. At this time, when the removal operation force is weakened, the key moves in the direction of the return force of the spring. When the key moves a predetermined distance in this direction, the pop-out prevention protrusion provided on the key comes into contact with the pop-out prevention protrusion opposing portion provided on the key support member, thereby stopping the key from moving. This movement also eliminates the force stored in the spring, so that the key will not pop out again when removed from this state. In other words, even if the recessed part of the pivot point of the key is roughly removed from the engagement part of the key supporting member against the pressure force of the spring when removing the key, the returning force of the spring will cause the key supporting member to There is no such thing as jumping out with force. Therefore,
The removal work can be carried out with peace of mind, and accidents such as the key accidentally falling from the key support member and being damaged or damaged, or the spring coming off and being lost can be reduced and prevented.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of the keyboard device according to the present invention, FIG. 2 is a perspective view of the main parts of the key, FIG. 3 is a side view of the main parts of the key, and FIG. 4 is a rear view of the key. FIG. 5 is a bottom view of the main part of the key, and FIG. 6 is a sectional view taken along the line of FIG. 3.

Components and parts that are the same as those in FIGS. 12 and 13 are designated by the same reference numerals, and their explanations will be omitted. In this embodiment, a white key is shown as key 1. In addition, the actuator 17 of the key 1 is located at the center of the lower surface of the keyboard frame 4.
A key switch 25 that is turned on and off is provided. The keyboard frame 4 is disposed on a device fixing part such as a shelf board of the main body of the musical instrument, with its front and rear ends fixed by screws.

Now, in this embodiment, a protrusion (protrusion for preventing protrusion) 30 as a stopper for preventing the key 1 from protruding from the engagement hole 5 is provided on the rotation fulcrum 3 of the key 1, and a hole in the engagement hole 5 is provided. The shape has been changed, the rear end bent portion 20 of the keyboard frame 4 is bent downward, and the key fall prevention member 19 has a tongue piece (protrusion for preventing popping out) that makes it easier to engage with the protrusion 30. This device differs from the conventional device shown in FIGS. 12 and 13 in that the opposing portion 31 is integrally provided, but the other configurations are generally the same.

The protrusion 30 protrudes from the rear surface of the rotation fulcrum 3, that is, the surface opposite to the surface on which the recess 2 is formed, and extends downward from the rotation fulcrum 3. There is. Projections 3 are provided at the bottom of both sides of the projection 30.
3a and 33b are provided integrally, and a step portion 34 that is one step higher than the projecting portions 33a and 33b is provided at the lower rear surface of the protrusion 30 corresponding to the tongue piece 31, and furthermore, a step portion 34 is provided at the lower rear surface of the protrusion 30 corresponding to the tongue piece 31. A pair of left and right vanes 35a, 35b extending longitudinally is integrally provided, and the lower ends of these vanes 35a, 35b are connected to the front ends of the respective overhangs 33a, 33b.

The engagement hole 5 of the keyboard frame 4 is formed into a substantially convex shape as shown in FIG.
wide hole 5A into which is inserted, and this wide hole 5A
It is configured with a narrow hole portion 5B that communicates with the rear end and prevents the protrusion 30 from protruding upward. The width W ₁ of the wide hole portion 5A is the width W ₂ of the rotation fulcrum portion 3.
(Fig. 5), and the length _l1 is from the front end of the rotation fulcrum 3 to _the vane plates 35a _, 35b.
Dimension to the rear surface of l ₂ (Fig. 3) is slightly larger (l ₁
> l ₂ ), the width W ₃ of the narrow hole portion 5B is larger than the width W ₄ of the stepped portion 34 and the width W ₅ of the lower end of the protrusion 30 (Fig. 4)
smaller (W ₅ > W ₃ > W ₄ ), the length l ₃ is the wing plate 35
The dimension from the rear surface of a, 35b to the rear end surface of the lower end of the protrusion 30 is slightly larger than l ₄ (FIG. 2) (l ₃ > l ₄ ).
Moreover, the overhanging portions 33a, 3
The dimension l ₅ (FIG. 3) to the top surface of the keyboard frame 3b is larger than the thickness t of the keyboard frame 4.

The narrow hole portion 5B has a rear end extending to the bent portion 20 of the keyboard frame 4, so that the width of the narrow hole portion 5B is approximately L.
It is shaped like a letter.

In the keyboard device having such a configuration, when setting the key 1 on the keyboard frame 4, first insert the bent portion 7a of the stopper 7 into the through hole 8 of the keyboard frame 4.
and insert the rear end of the return spring 6 into the spring locking part 10.
abutting and engaging. At this time, the protrusion 30 is inserted into the engagement hole 5.
It corresponds to the wide hole portion 5A and falls into the hole portion 5A. In this state, if the back end of the key 1 is rattled in the left-right direction, the wing plates 35a and 35b are
Regulation is prevented by contacting both side edges of A. Further, as shown in FIG. 3, the lower end of the protrusion 30 is slightly inserted into the narrow hole 5B, and the overhang 33
A and 33b partially face the lower surface of the keyboard frame 4 and are caught in the narrow hole 5B, so that the protrusion 30 is prevented from popping out upward.

Next, in this state, the key 1 is moved back against the spring 6. Then, the spring 6 is further buckled and deformed, detached from the spring locking piece 12 of the key 1, and transferred to the stepped portion 15 (FIG. 13) on the keyboard frame 4.
Further, as the key 1 moves backward, the rotation fulcrum 3 moves along the upper surface of the keyboard frame 4 and corresponds to the wide hole 5A of the engagement hole 5. Therefore, when the rear end of the key 1 is pushed down, the rotation fulcrum part 3 is inserted into the wide hole part 5A, and the lower end surface of the rear end of the key 1 is inserted into the keyboard frame 4.
touches the top surface of the Then, when the external force in the front and back direction is removed from the key 1, the key 1 moves forward and returns due to the force of the spring 6, so that the recess 2 abuts and engages with the front edge 40 (FIG. 3) of the engagement hole 5. , the installation of the key 1 is completed.

On the other hand, if the key 1 is to be removed from the keyboard frame 1, the operation described above may be reversed. That is, the key 1 is moved backward against the spring 6, and the wing plate 35
a, 35b to the rear edge 41a, 41 of the wide hole portion 5A.
b (Fig. 7). Then, the engagement between the recess 2 and the front edge 40 of the engagement hole 5 is disengaged, and the rotation fulcrum 3 can be pulled out from the wide hole 5A. However, since the protruding parts 33a and 33b of the protruding part 30 come into contact with the peripheral edge of the narrow hole part 5B on the back surface of the keyboard frame 4, the protruding part 30 cannot be pulled out from the engaging hole 5, thereby preventing the key 1 from popping out. To prevent. After the rotation fulcrum part 3 is removed, the key 1 is moved forward by the force of the spring 6, and the other end 6B of the spring 6 is received by the spring locking piece 12 of the key 1 from the stepped part 15 of the spring locking part 10. After being passed, the protrusion 30 corresponds to the wide hole 5A. Therefore, the key 1 is completely removed by lifting the rear end of the key 1, removing the protrusion 30 from the wide hole 5A, and then removing the stopper 7 from the through hole 8. At this time,
The protrusion 30 is dimensioned so that it cannot come out of the wide hole 5A until the spring 6 is held by the spring locking parts 9 and 12. Therefore, the spring 6 does not fall off from the key 1.

Thus, according to the keyboard device having such a configuration, when the key 1 is moved back against the spring 6 during the key removal operation and the rotation fulcrum portion 3 is pulled out from the engagement hole 5, the protrusion is removed in this state. Since the key 30 has not been pulled out yet and is still functioning as a stopper, the spring force of the spring 6 prevents the rear end of the key 1 from flying up, and also prevents the return spring 6 from falling off when the key 1 jumps up. can do. In addition, the wing plates 35a, 35
b acts as a guide when the rotation fulcrum part 3 is inserted into the wide hole part 5A of the engagement hole 5 during the key installation operation, and also serves as a guide when the rotation fulcrum part 3 is inserted into the wide hole part 5A of the engagement hole 5. Prevents directional wobbling.

FIGS. 8 and 9 are an exploded perspective view and a cross-sectional view of essential parts showing another embodiment of the present invention.
In this embodiment, a protrusion 50 for preventing slippage is integrally provided on the rear end surface of the rotation fulcrum 3, and the engagement hole 5 extends to a bent piece 20 provided at the rear end of the keyboard frame 4. It was formed as follows. The bent piece 20 is bent upward at a substantially right angle so that it closely faces the rear end surface of the key 1.

In such a configuration, when attaching the key 1, the protrusion 50 is first inserted into the vertical hole 5A of the engagement hole 5, and then the rotation fulcrum 3 is lowered and inserted into the horizontal hole 5B. Then, by abutting and engaging the recess 2 with the front edge of the engagement hole 5, the attachment of the key 1 is completed.

On the other hand, when removing the key 1, the key 1 is moved backward to release the engagement between the recess 2 and the engagement hole 5. Then, pull up the retreat of the key 1 and move the rotation fulcrum part 3 to the horizontal hole part 5.
Extract from B. At this time, the protrusion 50 is connected to the vertical hole 5
By coming into contact with the upper edge 53 of A, the rear end of the key 1 is prevented from flying upward. Rotation fulcrum part 3
After pulling out, the key 1 is moved forward and the protrusion 50 is pulled out from the vertical hole 5A, thereby completing the removal of the key 1 without causing the return spring 6 to fall off.

FIG. 10 is an exploded perspective view showing another embodiment of the invention. In this embodiment, a protrusion 60 for preventing protrusion is integrally provided on the front end side of the lower surface of the rotation fulcrum portion 3. The protrusion 60 includes a substantially hook-shaped base 60A whose lower end is bent forward;
A and a pop-out prevention part 60B provided at the tip. Both ends of the pop-out prevention portion 60B protrude to both sides of the base portion 60A, and have a length slightly smaller than the hole width of the engagement hole 5. The engagement hole 5
The hole width is slightly larger than the width of the rotation fulcrum part 3,
Further, on both sides of the hole 5 near the front end, there are opposing sides,
A pair of tongue pieces 61A and 61B that engage with the recess 2 are provided in a protruding manner. These pair of tongue pieces 61A, 61B
The distance is slightly larger than the width of the base portion 60A, and the hole portion 5A of the engagement hole 5 on the front side of the tongue pieces 61A, 61B is connected to the pop-out prevention portion 60B.
It has a size that allows it to be inserted.

In such a configuration, when the key 1 is disposed on the keyboard frame 4, the pop-out prevention portion 60B is inserted into the front side hole portion 5 of the engagement hole 5, as shown in FIG. 11a.
Drop the protrusion 60 and rotation fulcrum part 3 into the engagement hole 5 from above in alignment with A. After the rotation fulcrum part 3 is inserted into the engagement hole 5 following the protrusion 60,
When the key 1 is moved forward as shown in FIG. Ru.

On the other hand, when removing the key 1, as shown in FIG.
A, 61B is disengaged. In this state, since the pop-out prevention part 60B is located at the rear of the front side hole part 5A, the protrusion 60 cannot be pulled out from the engagement hole 5, and the key 1 is slightly lifted and moved forward again. Then, a pair of tongue pieces 6
The base 60A is inserted between 1A and 61B, and the pop-out prevention part 60B is aligned with the front side hole part 5A,
When the key 1 is lifted in this state, the protrusion 60 slips out of the engagement hole 5, completing the removal of the key 1.

Therefore, even in such a configuration, the same effects as in the above embodiment can be obtained.

In the above embodiments, the case where the key 1 is provided with the spring locking piece 12 for temporarily locking the return spring 6 has been described, but the present invention is not limited to this in any way; It is also possible to temporarily attach it to the frame 4 side, and in that case, the spring locking part 10 and the bending piece 18 should be used as in JP-A-58-98784 (the embodiment in FIG. 1). Bye.

〔Effect of the invention〕

As explained above, in the keyboard device for an electronic musical instrument according to the present invention, a key is provided with a protrusion for preventing the key from popping out, and a protrusion for preventing the key from popping out is provided with a corresponding portion opposing the protrusion on the key support member in correspondence with the protrusion to prevent the key from popping out. When the key is attached, the protrusion and the opposite part of the pop-out prevention protrusion are separated by a predetermined distance, and when the key is removed, the concave part of the rotational fulcrum of the key is engaged with the key support member against the pressing force of the return spring. When the key is removed from the housing, the key moves a predetermined distance according to the return force of the return spring, and the key comes into contact with the key. When it comes into contact with the opposite part and stops, the force stored in the return spring is lost, so the key does not fly out. Therefore, the removal work can be carried out with peace of mind, and the key may accidentally fall from the key support member and be damaged. This can reduce and prevent accidents such as damage or loss of the spring due to it coming off.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the keyboard device according to the present invention, FIG. 2 is a perspective view of the main parts of the key, FIG. 3 is a side view of the main parts of the key, and FIG. 4 is a rear view of the key. Figure 5 is a bottom view of the main parts of the key, Figure 6 is a sectional view taken along the line of Figure 3, Figure 7 is a perspective view of the engagement hole, Figures 8 and 9.
The figures are an exploded perspective view and a sectional view of essential parts showing another embodiment of the invention, Fig. 10 is an exploded perspective view showing another embodiment of the invention, and Fig. 11 is for explaining the effect of preventing pop-out. Figures 12 and 13
The figures are sectional views showing a conventional example of a keyboard device in a mounted state and before mounting. 1...key, 2...recess, 3...rotation fulcrum, 4
... Keyboard frame, 5 ... Engagement hole, 6 ... Return spring, 9, 10 ... Spring locking portion, 12 ... Spring locking piece, 30, 50, 60 ... Projection.

Claims (1)

[Scope of Claims] 1. A key that is rotatably disposed on the key support member in the vertical direction by engaging the recess of the rotation fulcrum provided at the rear end with the engagement portion of the key support member. One end is locked to a spring locking portion provided on the key, and the other end is locked to a spring locking portion provided on the key support member, thereby giving the key a return habit and at the same time providing the recessed portion. a return spring that presses the lock against one end edge of the engaging portion; a protrusion for preventing pop-out provided on the key; and a portion opposing the protrusion for preventing protrusion provided on the key support member; The prevention protrusion and the protrusion opposing part are located apart from each other by a predetermined distance when the key is attached, and when the key is removed, the rotation fulcrum resists the pressing force of the return spring. A keyboard device for an electronic musical instrument, characterized in that when the concave portion is removed from the engagement portion of the key support member, the key is in a positional relationship such that the key comes into contact with the key after it moves a predetermined distance according to the restoring force of the restoring spring.