JP2790057B2 - Electronic keyboard instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic keyboard musical instrument, and more particularly to an improvement for improving workability in manufacturing and assembling.

[0002]

2. Description of the Related Art A mechanism for protecting a key switch at the time of assembling an electronic keyboard instrument and improving workability is disclosed in Japanese Patent Laid-Open No. 6-110450. In the prior art described in this publication, in a configuration in which a key unit (key block) including a plurality of keys is mounted on a key frame, a boss protrudes downward from the key unit side and guides the boss to the key frame side. By forming the holes, the insertion trajectory during assembly is kept constant. Also, when the key unit is slid horizontally from the front of the key longitudinal direction to the key frame during assembly, the key unit actuator contacts the key switch on the key frame and the key switch remains deformed. A contact prevention mechanism is provided to prevent fixing. With such a configuration, the assembling work is facilitated and the key switch on the key frame is protected. Conventionally, when fixing the key unit to the key frame by screwing,
In order to facilitate the screw tightening work, the key unit side and key frame side are provided with mutually engaging projections (or recesses) and resilient claws, and when the key unit is mounted on the key frame, It has a temporary fixing function so that it does not leave.

[0003]

However, the conventional electronic keyboard musical instrument has the following problems. (I) Since the boss having a special shape is provided on the key unit side, it is difficult to store the boss before assembling, and it is difficult to use a common key or key unit, thereby lowering productivity.
(Ii) After assembling, since the boss on the key unit side protrudes from the lower surface of the key frame, the thickness of the entire keyboard increases and the size of the keyboard increases, and the thickness on the lower side of the keyboard increases. Operability deteriorates. (Iii) Provision of temporary fixing projections, resilient claws, and the like for screwing work complicates the structure and complicates the attaching / detaching work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to provide an electronic keyboard instrument which has a simple structure, improves keyboard workability, and protects a key switch during assembly. And

[0005]

In order to achieve the above object, according to the present invention, there is provided a key comprising a key, a key fixing portion, and a rocking portion connecting the key and the key fixing portion. The unit is mounted on a key supporting member, and the flexible member is driven by a key pressing operation on the key supporting member.
An electronic keyboard musical instrument comprising a key switch having a key switch, an actuator for driving the key switch is provided on the key, and a key fixing portion of the key unit is fixed on the key support member. both to have elasticity in the above
At the time of mounting operation of the key unit,
To apply an external force to the key switch from the horizontal direction.
Protruding guide bosses to prevent deformation
An electronic keyboard instrument is provided, wherein a hole into which the guide boss fits is provided in the key fixing portion.

In the invention according to a second aspect, the guide boss according to the first aspect guides the key unit in a key longitudinal direction and a key press / release direction when the key unit is attached to a key support member. And a resilient piece that can be elastically displaced in the key longitudinal direction through the gap with respect to the guide piece in the key longitudinal direction, and the guide when the key fixing portion is not mounted. The total length of the piece, the gap, and the elastic piece in the key longitudinal direction is substantially equal to or larger than the diameter of the hole provided in the key fixing portion in the key longitudinal direction.

[0007]

According to the first aspect of the present invention, the guide boss having elasticity is provided so as to protrude above the key support member, and a hole corresponding to the guide boss is formed on the key unit side. Can be simplified, and the unit structure can be shared. In addition, since the guide boss does not protrude from the lower surface side of the key frame, the thickness of the entire keyboard can be reduced, and the space under the keyboard can be particularly widened to improve the performance operability. Further, the elasticity of the guide boss allows the key unit to be resiliently held together with the guide function, thereby improving the assembling workability.

According to the second aspect of the present invention, a resilient guide boss having a simple structure can be obtained, which can combine the guide function and the holding function of the key unit at the time of assembly, and can be used for screwing work. No special temporary fixing structure is required.

[0009]

FIG. 1 is a sectional view showing the structure of an electronic keyboard instrument according to an embodiment of the present invention. A key frame (key support member) 2 is fixed to a lower case 1 constituting a shelf plate of the musical instrument body by screws or the like (not shown) through a boss hole 3. A white key 4 and a black key 5 are swingably mounted on the key frame 2. Although the figure shows the configuration of the white key 4, the configuration of the black key 5 is substantially the same. The rear end of the key frame 2 (the front end (right side in the figure) in the key longitudinal direction F) is separated and cut for each key 4, 5 and bent vertically (key pressing direction G) to form a core 6. Is formed. The key guide 7 is formed on the core 6 by outsert molding of a resin. Each key is provided with a substantially L-shaped guided member 8 so as to slide on both sides of the key guide 7 in the key width direction. The bent lower end portion of the guided member 8 constitutes an upper limit stopper 9, which abuts on a lower end surface extending on both sides of the key guide 7 to define an upper limit position of a key pressing stroke (as shown).

A flexible board 10 on which various control circuits, switch circuits, power supply lines, signal lines, and the like are formed is mounted on the upper surface of the central portion of the key frame 2. On the flexible substrate 10, there is formed a lower bowl portion 11 made of an elastic member such as rubber having a movable contact therein, and a fixed contact pattern (not shown) provided on the substrate corresponding to the movable contact in the lower bowl portion 11. ) Is fixed. An actuator 12 is provided on the key side of the key switch at a position facing the lower bowl portion 11. A protrusion 13 is formed at the lower end of the actuator 12. The protrusion 13 fits into a crown 14 provided on the upper surface of the lower bowl 11 of the key switch.
When a key is depressed by a key pressing operation, the actuator 12 elastically deforms the lower bowl portion 11 of the key switch, closes the internal switch circuit, and generates a key-on signal and a key pressing speed signal.

The projections 41 provided on the lower surface of the key come into contact with the upper end surface of the key guide 7 when the key unit is assembled to the key frame, so that the lower bowl 11 of the key switch is pressed against the actuator 12. It is a projection for a key assembly guide for preventing it from being fixed.

The plurality of predetermined white keys 4 are connected to a first white key common base end 16 via a swinging portion 15 made of an elastic member. Another plurality of white keys are similarly set to the second white key common base end 1.
7 is connected. Further, a plurality of predetermined black keys 5 are similarly connected to the black key common base end portion 18. Each common base end 1
6, 17 and 18 are superposed in three stages to form a key common base end 19. The key common base end 19 is fixed on the key frame 2 to form a key fixing unit. A plurality of white keys 4 and black keys 5 connected to such a key common base end 19.
Thus, a key unit 32 of, for example, one octave is configured (see FIG. 2 described later).

A hole 20 is formed in the key common base end portion 19, and a guide boss 24 according to the present invention is fitted into the hole 20. The guide boss 24 is provided between the guide piece 21 and the gap 2.
An elastic piece 23 is arranged in parallel with the guide piece 21 through the guide piece 2. The elastic piece 23 projects from the end of the key frame 2 and is fixed. The operation of the guide boss 24 will be described later. Reference numeral 25 denotes an upper case which constitutes the main body of the musical instrument together with the lower case 1, and is provided with operation switches 26 for controlling various musical sounds or for selecting.

FIG. 2 shows the three-tiered key common base end 19.
FIG. 5 is an exploded perspective view showing a part of a key unit including a plurality of keys connected to the key unit. A convex portion 31 formed on the common base end portion 16 of the first white key block 27 including a plurality of predetermined white keys (E, etc.) is a second white key block 28 including another white key (F, D, etc.). The common base ends 16 and 17 are overlapped with each other by fitting into the recess 30 formed in the common base end 17. Further, the overlapped common base ends 16 and 17 are similarly overlapped with a common base end of a black key block (not shown) made of a black key such as D #, and a three-tiered key common base end 19 ( FIG. 1) is formed. Holes 20 into which the above-described guide bosses 24 (FIG. 1) are inserted are formed at common base ends of the three blocks at positions aligned with each other. In addition, a mounting hole 29 through which a screw or the like for fixing the three-tiered key common base end portion 19 to the key frame 2 is formed.

FIGS. 3A and 3B show the guide boss 24 described above.
It is a front view and a side view of FIG. As described above, the elastic piece 23 is formed in parallel with the guide piece 21 via the gap 22. The elastic piece 23 is elastically displaceable in the direction of approaching and separating from the guide piece 21. Such a guide boss 24
May be integrally formed with the key frame with a resin material, or separately formed with a metal material and joined and fixed to the key frame 2 by an appropriate means, or cut and raised by pressing the key frame 2 May be formed.

FIG. 4 is a perspective view showing another example of the shape of the embodiment of the present invention. A plurality of keys 33 are swingably connected to the key common base end 19 via the swinging part 15 to constitute the key unit 32. The guide boss 24 is formed in the key frame 2 as described above, and the hole 20 into which the guide boss 24 is fitted is provided in the key common base end 19 of the key unit 32.

FIGS. 5A to 5D are side views sequentially showing the assembling operation of the electronic keyboard instrument according to the embodiment of the present invention. FIGS. 6A to 6C are explanatory diagrams showing states of the guide boss corresponding to FIGS. 5B to 5D. First, as shown in FIG. 5A, the key common base end portion 19 of a keyboard unit 40 of, for example, one octave composed of a plurality of white keys 4 and black keys 5 is positioned above the guide boss 24. Accordingly, the key-side actuator 12 is disposed above the key switch lower bowl 11 on the key frame 2 side. In this case, since the position of the top of the guide boss 24 is considerably higher than that of the key switch lower bowl 11, when the key unit 40 is moved on the key frame 2 and is arranged and operated at a predetermined position, the actuator 12 on the key unit side is moved. The key switch bowl 11 is not deformed by striking the key switch bowl 11 on the key frame from the horizontal direction. Temporary key tip (right side in the figure)
If the key is dropped more than in FIG.
And the projection 41 abuts, and the actuator 12 and the key switch bowl 11 do not abut in this state.

Subsequently, as shown in FIG. 5B, the key common base end 19 is engaged with the upper end of the guide boss 24. At this time, as shown in FIG. 6A, the inner wall surface 19a of the hole 20 formed in the key common base end portion 19 contacts the distal end guide surface 21a of the guide piece 21 of the guide boss 24 and is guided downward.

Further, as shown in FIG. 5C, when the key common base end 19 is pushed down along the guide piece 21, the inner wall surface 19 a of the key common base end 19 becomes the guide boss 24.
6B, the insertion operation proceeds while deforming the elastic piece 23 toward the guide piece 21 as shown by the arrow A. As shown in FIG.

When the key common base end 19 is completely mounted on the guide boss 24 and the state shown in FIG.
As shown in FIG. 6 (C), the guide piece 23 of FIG. 4 returns in the direction of arrow B and resiliently pushes the key common base end 19 in a state of being fitted in the hole of the key common base end 19. Hold to make it difficult to pull out. At this time, the actuator 1 on the key unit side
Reference numeral 2 denotes a state in which it is in contact with the upper end of the key switch lower bowl 11 on the key frame side (the state of FIG. 1).

[0021]

As described above, in the invention according to the first aspect, the structure of the key unit is simplified, the unit can be shared, and the productivity is improved. In addition, since the guide boss does not protrude from the lower surface side of the key frame, the thickness of the entire keyboard can be reduced, and the space under the keyboard can be particularly widened to improve the performance operability. Also, when mounting the key unit on the key frame,
Due to the elasticity of the guide boss, the key unit can be elastically held together with the guide function, so that the workability of the assembly is improved.

Further, by raising the guide boss to a certain degree or more, when the key common base end engages with the tip of the guide boss, the actuator is located almost directly above the key switch. Abuts on the key switch almost vertically from above.
Therefore, without requiring extreme attention during assembly,
In addition, it is possible to prevent external force on the key switch from the horizontal direction with a simple configuration without strengthening the rubber material of the switch, so that the assembling work can be facilitated and the degree of freedom of design can be increased. That is, by increasing the height of the guide boss 24 or providing a lower limit stopper 91 shown in FIG. 1 at this position, the projection 41 can be made unnecessary. Key switch protection is provided. In this sense, in the present invention, the protrusion 41 is not an essential requirement but an auxiliary requirement.

Further, according to the second aspect of the present invention, a resilient guide boss having a simple structure can be obtained, so that the guide function and the holding function of the key unit can be combined at the time of assembling. This eliminates the need for a special temporary fixing structure, thereby simplifying the structure and improving the assembling workability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main configuration of an electronic keyboard instrument according to an embodiment of the present invention.

FIG. 2 is a perspective view partially showing a configuration of a key unit in the embodiment of FIG. 1;

FIGS. 3A and 3B are a front view and a side view of a guide boss according to an embodiment of the present invention, respectively.

FIG. 4 is a perspective view showing another example of a main part shape of the electronic keyboard instrument according to the embodiment of the present invention.

FIGS. 5A to 5D are explanatory diagrams sequentially showing an assembling operation of the electronic keyboard instrument according to the present invention.

FIGS. 6A to 6C are explanatory diagrams sequentially showing the operation of the guide boss in the assembling operation of the electronic keyboard instrument according to the present invention.

[Explanation of symbols]

2: key frame, 4: white key, 5: black key, 7: key guide, 8: guided member, 9: upper limit stopper, 1
1: Bowl part of key switch, 12: Actuator,
15: swing part, 19: key common base end, 20: hole,
21: guide piece, 22: gap, 23: elastic piece, 2
4: Guide boss, 32: Key unit.

Claims (2)

(57) [Claims] A key unit comprising a key, a key fixing portion, and a swinging portion connecting the key and the key fixing portion is mounted on a key supporting member, wherein the key supporting member is provided with a key unit. A key switch having flexibility which is driven by a key pressing operation of the key; an actuator for driving the key switch is provided on the key; and a key fixing portion of the key unit is fixed on a key support member. In such an electronic keyboard instrument, the key support member has elasticity and the key unit is mounted.
During the landing operation, the actuator is engaged with the key switch.
To prevent deformation by applying external force from the horizontal direction.
An electronic keyboard musical instrument, wherein a guide boss for protruding the guide boss is provided, and a hole for fitting the guide boss is provided in the key fixing portion. A guide piece for guiding the key unit in a key longitudinal direction and a key pressing / releasing direction when the key unit is attached to a key support member, and a guide piece provided with a gap between the guide piece and the guide piece. An elastic piece that can be elastically displaced in the key longitudinal direction is arranged side by side in the key longitudinal direction, and the total length of the guide piece, the gap and the elastic piece in the key longitudinal direction when the key fixing part is not mounted is provided. 2. The electronic keyboard instrument according to claim 1, wherein は is substantially equal to or larger than a diameter of the hole provided in the key fixing portion in a key longitudinal direction. 3.