JPH0968970A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard device with which a coil spring is easily mountable in a predetermined position between chassis and key at the time of mounting the key to the chassis. SOLUTION: A rib 74 is formed at the chassis 70 of the keyboard device 60 and a wall 100 for preventing the fall of the spring is formed at the key 90. The fall of the coil spring 110 is prevented by the rib 74 and the wall 100 for preventing the fall of the spring. A second projecting part 98 is intruded into the other end 114 of the coil spring 110, by which the key 90 is exactly and easily mounted at the chassis 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device provided in, for example, an electronic musical instrument.

[0002]

2. Description of the Related Art Electronic musical instruments have been actively used in recent years. Some of these electronic musical instruments are provided with a keyboard device, or there is an independent keyboard device connected to the electronic musical instrument, one example of which is shown in FIG. The keyboard device 10 includes a chassis 20 and keys 30 such as black keys 32 and white keys 34. Since the black key 32 and the white key 34 are similar in structure, the structure of the white key 34 is shown in FIG.
The white key 34 is the turning portion 36 at the left end of FIG.
It is attached so as to be rotatable in the direction of approaching and separating from 0. In addition, the white key 34 has an upper wall 34a and both side walls 34b that are open to the chassis 20 side as a whole and have a U-shaped cross section. Further, the white key 34 is urged in the direction of arrow A by a coil spring 38 that returns the pressed white key 34 to the original position. The spring protrusion 21 is inserted into one end of the coil spring 38, and the spring holding portion 31 is inserted into the other end of the coil spring 38. The spring holding portion 31 has an upper wall 34.
It is formed in a space surrounded by a and both side walls 34b, and cannot be seen from above the white key 34.

Stop felts 22a and 22b are attached to the upper surface 20a and the lower surface 20b of the chassis 20, respectively, for limiting the rotation range of the white key 34,
The contact portions 40a, 40b are the stop felts 22a, 22.
By making contact with b, the rotation range of the white key 34 is limited. On the lower surface 20b side of the chassis 20, a contact board 50 is arranged to notify the key press information of the white key 34 to a control unit (not shown) of the electronic musical instrument. When the white key 34 is pressed, the key actuator 42 of the white key 34 moves the rubber switch 5
2, the white key 34 is pressed and the pressing speed is notified to the control unit of the electronic musical instrument.

As described above, the keyboard device 10 includes the chassis 20, the white key 34 attached to the chassis 20, and the coil spring 38 interposed between the chassis 20 and the white key 34. Since it is required to return the pressed white key 34 to the original position, it is necessary to fix the white key 34 at a predetermined position between the chassis 20 and the white key 34.

As a keyboard device in which the coil spring is fixed at a predetermined position between the chassis and the white key, a cylindrical space is formed in the white key, and the coil spring is inserted into the space to form the coil spring. A fixed keyboard device (see, for example, Japanese Utility Model Publication No. 54-33127) or a keyboard device in which a spring-holding protrusion is formed on a key and a chassis as shown in FIG. 15 (see, for example, Japanese Utility Model Publication No. 58-46465). ) Is known.

Among the conventional keyboard devices described above, in the keyboard device in which the spring and the protrusion for holding the spring are formed on the chassis, the work of attaching the white key 34 to the chassis 20 is performed by the following (1) to (3). It is done in order. (1) As shown in FIG. 16, first, one end of the coil spring 38 is inserted into the spring protrusion 21. (2) Next, the white key 3 is inserted from above the chassis 20 so that the spring holder 31 (see FIG. 15) is inserted into the other end of the spring.
4 is mounted on the chassis 20. (3) After placing the white key 34 on the chassis 20, the shaft of the chassis 20 is fitted into the hole of the white key 34 to form the rotating portion 36.

[0007]

Problems to be Solved by the Invention (1) to (3)
The work of (2) of the work of the above is the white key 34 as described above.
This is a work for inserting the spring holding portion 31 surrounded by the upper wall 34a and both side walls 34b and which cannot be seen from above the white key 34 into the other end of the coil spring 38. Therefore, this work is very troublesome. There is a problem that it becomes a difficult and time-consuming task. Even in such a difficult work, as shown in FIG. 16, one end of the coil spring 38 accurately enters the spring protrusion 21 and the coil spring 38 is placed on the chassis 20.
Is placed vertically, the white key 34 can be accurately attached to the chassis 20. However, the coil spring 38
Is tilted (obliquely) into the spring protrusion 21 or the coil spring 38 is tilted due to vibration during work, etc., in a state where the spring holding portion 31 does not accurately enter the other end of the coil spring 38. There is a possibility that the white key 34 may be attached to the chassis 20, which causes a defective product. Such a problem also exists in the above-mentioned conventional keyboard device in which a cylindrical space is formed in a white key, and a coil spring is inserted into the space to fix the coil spring.

In view of the above circumstances, it is an object of the present invention to provide a keyboard device capable of easily fixing a coil spring at a predetermined position between the chassis and the key when mounting the key on the chassis.

[0009]

The first keyboard device of the present invention for achieving the above object is a chassis and a chassis which is rotatable in a direction extending in a predetermined longitudinal direction and contacting with and separating from the chassis. One end is supported, and a key having an upper wall and both side walls as a whole having a U-shaped cross section, which is opened to the side of the chassis, and is interposed between the key and this chassis,
In a keyboard device including a coil spring that biases the key in a direction away from the chassis, a first protrusion that protrudes from the chassis toward the key and enters one end of the coil spring, and the first protrusion. The chassis side is provided with a rib which is formed at a position adjacent to the protrusion in the longitudinal direction and which protrudes toward the key along the outer wall of the coil spring into which the first protrusion is inserted. A second protrusion projecting toward the chassis from a wall surface of the upper wall of the key facing the chassis, the second protrusion protruding into the other end of the coil spring, and the longitudinal direction with respect to the second protrusion. Formed in the position adjacent to the direction,
The key side is provided with a spring fall prevention wall protruding toward the chassis along the outer wall of the coil spring into which the second protrusion is inserted.

Here, the spring fall prevention wall is the second
It is preferable that the protrusion amount is larger than that of the protrusion portion. Further, it is preferable that the spring fall prevention wall is a semi-cylindrical wall curved along the outer wall of the coil spring into which the second protrusion is inserted. Further, it is preferable that end portions on the chassis side of portions of the both side walls of the key, which face the second protrusions, are formed in a tapered shape that opens toward the chassis.

A second keyboard device of the present invention for attaining the above object has a chassis, one end of which is supported by the chassis so as to extend in a predetermined longitudinal direction and be rotatable in a direction of coming into contact with and separating from the chassis. A key having an upper wall and both side walls having a generally U-shaped cross section which is opened to the side of the chassis, and is interposed between the key and the chassis, and the key is biased in a direction away from the chassis. In a keyboard device including a coil spring, a protrusion that protrudes from the chassis toward the key and that enters one end of the coil spring,
A rib extending along the outer wall of the coil spring into which the protrusion is inserted is formed at a position where the distance from the protrusion is shorter than the diameter of the wire of the coil spring, and the rib is provided on the chassis side. The element wire of the coil spring is press-fitted between the rib and the protruding portion.

Here, it is preferable that the rib has a convex portion whose tip abuts on the strand of the coil spring into which the protrusion is inserted. Also, the rib is
It is preferable that the coil spring has a spring property that urges the strand of the coil spring into which the protruding portion is inserted toward the protruding portion.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a keyboard device according to a first embodiment of the present invention, (a) is a sectional view in which a part of a key is cut away,
(B) is a partially enlarged view of (a) and shows a state immediately before a key is attached to the chassis. 2 is a perspective view showing a part of the keys of the keyboard device shown in FIG. 1 as seen from the back side, and FIG. 3 is a perspective view showing a part of the chassis of the keyboard device shown in FIG. Here, the same components as those of the keyboard device shown in FIG. 15 are designated by the same reference numerals.

The keyboard device 60 includes a chassis 70, a key 90 extending in a predetermined longitudinal direction (direction of arrow A), and a chassis 7.
A coil spring 110 is provided between 0 and the key 90. The key 90 has an upper wall 92 and side walls 94 that are open to the side of the chassis 70 and have a generally U-shaped cross section. Further, one end portion 96 of the key 90 is supported by the chassis 70 so as to be rotatable in a direction in which the key 90 comes into contact with and separates from the chassis 70.
Further, the coil spring 110 is interposed between the key 90 and the chassis 70 and biases the key 90 in the direction of separating from the chassis 70.

A key 90 is attached to the chassis 70 from the chassis side.
A first projecting portion 72 is formed so as to project toward, and the first projecting portion 72 is inserted into one end 112 of the coil spring 110. Further, ribs 74 and 76 are formed on the chassis 70 at positions adjacent to the first protrusion 72 in the longitudinal direction (direction of arrow A). Ribs 74,
The protrusion 76 projects toward the key 90 along the outer wall 110a of the coil spring 110 with the first protrusion 72 inserted therein. In the present embodiment, the rib 74 corresponds to the “rib” according to the present invention.

The key 90 is formed with a second protrusion 98 protruding from the wall surface 92a of the upper wall 92 facing the chassis 70 toward the chassis 70. The second protrusion 98 is formed on the key 90. It has entered the other end 114 of the coil spring 110. The rib 90 is located at a position adjacent to the second protrusion 98 in the longitudinal direction (direction of arrow A) on the key 90.
4, a spring fall prevention wall 100 is formed at a position on the opposite side of the coil spring 110 in the longitudinal direction (arrow A direction). The spring fall prevention wall 100 is a semi-cylindrical wall as shown in FIG. 2, and is curved along the outer wall 110 a of the coil spring 110 in which the second protrusion 98 is inserted and protrudes toward the chassis 70. ing. Further, the protrusion amount of the spring fall prevention wall 100 is larger than the protrusion amount of the second protrusion 98. As shown in FIG. 2, both side walls 94 of the key 90 are shown.
At the end of the portion facing the second protrusion 98 on the side of the chassis 70, a taper 94a that opens toward the chassis 70 is formed. As described above, FIG. 1 shows a state immediately before the key 90 is attached to the chassis 70, and the key 90 is attached to the shaft 78 of the chassis 70.
By inserting the hole 102 of the
0 is attached.

As described above, the chassis 70 of the keyboard device 60.
The ribs 74 are formed on the key 90, while the key 90 is provided with a spring fall prevention wall 100 and a taper 94a. The operation of each of these members will be described with reference to FIG. In FIG. 4A, in order to show the action of the spring fall prevention wall 100, the key 90 ′ without the spring fall prevention wall 100 is attached to the chassis 7.
4 (b) is a schematic view showing how the ribs 74 are attached to the chassis 7 without the ribs 74.
It is a schematic diagram which shows a mode that the key 90 is attached to 0 '.

Even if the one end 112 of the coil spring 110 accurately enters the first protrusion 72 of the chassis 70 and the coil spring 110 is vertically placed on the chassis 70,
As shown in FIG. 4 (a), the key 90 ′ has a spring fall prevention wall 1
When there is not 10, when the position of the second protruding portion 98 of the key 90 ′ is displaced to the rib 74 side with respect to the position of the first protruding portion 72, the second end portion 114 of the coil spring 110 is provided with a second The key 90 ′ is attached to the chassis 70 in a state where the protrusion 98 does not enter, which causes defective products. On the other hand, the coil spring 1 is attached to the first protrusion 72 of the chassis 70 '.
One end 112 of the 10 fits exactly into the chassis 70 '
Even if the coil spring 110 is placed vertically on top of FIG.
As shown in (b), when the ribs 74 are not provided on the chassis 70 ′, the position of the second protrusion 98 of the key 90 deviates from the position of the first protrusion 72 toward the spring fall prevention wall 110 side. In this case, the key 90 is attached to the chassis 70 'without the second protrusion 98 entering the other end 114 of the coil spring 110, which causes defective products. As described above, when either the rib 74 or the spring fall prevention wall 110 is absent, when the key 90 is attached to the chassis 70, it is necessary to accurately align the first protrusion 72 and the second protrusion 98. Is a difficult installation work. Furthermore, when the one end 112 of the coil spring 110 does not accurately enter the first protrusion 72 of the chassis 70 and the coil spring 110 is tilted, the coil spring 110
Insert the second protrusion 98 into the other end 114 of the key 9
Accurately attaching 0 to the chassis 70 is extremely difficult. However, since the ribs 74 are formed on the chassis 70 of the keyboard device 60 and the spring fall prevention wall 110 is formed on the key 90, the fall of the coil spring 110 is prevented by the ribs 74 and the spring fall prevention wall 110. Has been
The key 90 can be accurately and easily attached to the chassis 70 by inserting the second protrusion 98 into the other end 114 of the coil spring 110. Further, the taper 94a is provided on the upper wall 92.
Since the coil spring 110 is prevented from collapsing in a direction substantially orthogonal to the width direction (direction of arrow A), the work of attaching the key 90 becomes easier.

FIGS. 5 and 6 are plan views showing the ribs of the keyboard device according to the second embodiment of the present invention. The keyboard device of the second embodiment is characterized by the ribs formed on the chassis 70. The rib 120 of this keyboard device is
The distance between the protrusion 72 and the protrusion 72 is the wire 110 of the coil spring 110.
It is formed at a position shorter than the diameter of a. A portion of the rib 120 on the side of the protrusion 72 is a protrusion 120a, and the tip of the protrusion 120a abuts on the strand 110a. Therefore, the wire 110a of the coil spring 110 is press-fitted between the rib 120 and the protrusion 72, and the coil spring 1
10 is fixed. Therefore, even if the inner diameter of the coil spring is different due to the manufacturing error of the coil spring 110 and the inner diameter is larger than the outer diameter of the protrusion 72, the coil spring 110 can be fixed substantially perpendicular to the chassis 70. The coil spring can be easily fixed at a predetermined position between the chassis and the key.

FIG. 7 is a side view showing a rib of a keyboard device according to a third embodiment of the present invention. The keyboard device of the third embodiment is characterized by the ribs formed on the chassis 70.
The ribs 130 of this keyboard device have a U-shape inverted and have a spring property. One end portion 1 of the rib 130
The numeral 32 is fixed to the chassis 70. A protrusion 134 a protruding toward the protrusion 72 is formed on the other end portion 134 of the rib 130, and the distance between the tip of the protrusion 134 a and the protrusion 72 is determined by the strand 110 of the coil spring 110.
shorter than the diameter of a. Therefore, the protrusion 13 of the rib 130
The wire 11 of the coil spring 110 is provided between the 4a and the protrusion 72.
0a is press-fitted, and this wire 110a is projected onto the projection 72.
The coil spring 110 is more surely fixed by being biased by. Therefore, even if the inner diameter of the coil spring is different due to the manufacturing error of the coil spring 110 and the inner diameter is larger than the outer diameter of the protrusion 72, the coil spring 110 can be fixed substantially perpendicular to the chassis 70. The coil spring can be easily fixed at a predetermined position between the chassis and the key. Further, as described above, the rib 130 has a spring property, so that noise due to resonance of the coil spring 110 can be prevented.

8 to 14 show a modification of the rib 130 shown in FIG. FIG. 8 shows the first rib of FIG.
It is a side view which shows a modification. As shown in FIG. 8, a pair of ribs 130 are arranged so as to sandwich the protrusion 72. Therefore, as compared with the case of one rib 130, the coil spring 11
0 is more securely fixed.

FIG. 9 is a side view showing a second modification of the rib shown in FIG. 7, and FIG. 10 is a plan view of the rib shown in FIG. The shape of the rib 140 is similar to the shape of the rib 130 of FIG. 7, but the rib 140 is different from the rib 1 of the surface of the chassis 70.
It is in contact with the surface on which 40 is arranged. Similar to the rib 130 of FIG. 7, one end 142 of the rib 140 is fixed to the chassis 70. At the other end 144 of the rib 140, the protrusion 1 protruding toward the protrusion 72 is provided.
44 a is formed, and the distance between the tip of the protrusion 144 a and the protrusion 72 is shorter than the diameter of the wire 110 a of the coil spring 110. Therefore, similar to the rib 130 of FIG. 7, the coil spring 110 can be fixed substantially perpendicularly to the chassis 70, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

FIG. 11 is a plan view showing a third modification of the rib shown in FIG. As shown in FIG. 11, a pair of ribs 140 are arranged with the protrusion 72 interposed therebetween. For this reason,
The coil spring 110 is more reliably fixed than in the case of one rib 140. FIG. 12 is a plan view showing a fourth modification of the rib shown in FIG.

As shown in FIG. 12, a pair of ribs 140 are arranged so as to sandwich the protruding portion 72. However, compared to the arrangement of FIG. 11, the directions of the U-shaped ribs 140 are opposite to each other. There is. Even if the pair of ribs 140 are arranged in this way, the coil spring 110 is securely fixed, and the coil spring 1
The fall of 10 can be prevented. FIG. 13 is a plan view showing a fifth modification of the rib shown in FIG.

The rib 150 has an elliptical shape, and the rib 150 is fixed to the chassis 70 (see FIG. 9) by a fixing portion 152. A protrusion 154 protruding toward the protrusion 72 is formed on the opposite side of the fixed portion 152.
The distance between the tip of 54 and the protrusion 72 is equal to the coil spring 110.
Is shorter than the diameter of the wire 110a. Therefore, similar to the rib 130 of FIG. 7, the coil spring 110 can be fixed substantially perpendicularly to the chassis 70, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

FIG. 14 is a plan view showing a sixth modification of the rib shown in FIG. The rib 160 has an elliptical shape, and the rib 1
Reference numeral 60 denotes a pair of fixing portions 162, which is a chassis 70 (see FIG. 9).
It is fixed to. In addition, two adjacent ribs 160
A pair of protrusions 164 protruding toward each of the two protrusions 72 is formed, and the tip of the protrusion 164 and the protrusion 7 are formed.
The distance from 2 is shorter than the diameter of the wire 110a of the coil spring 110. Therefore, one rib 160 can prevent the two coil springs 110 from collapsing, and as a result, the coil spring 1
The 10 can be fixed substantially perpendicular to the chassis 70, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

[0027]

As described above, the chassis of the first keyboard device of the present invention is formed with ribs, and the key is formed with the spring fall prevention wall, so that the fall of the coil spring becomes a rib. The key can be accurately and easily attached to the chassis by being prevented by the spring fall prevention wall and allowing the second protrusion to enter the other end of the coil spring.

According to the second keyboard device of the present invention,
Since the chassis includes the protrusion and the rib, and the coil spring is formed by press-fitting the wire between the rib and the protrusion,
The coil spring can be fixed substantially perpendicular to the chassis, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

[Brief description of drawings]

FIG. 1 shows a keyboard device according to a first embodiment of the present invention,
(A) is a sectional view in which a part of the key is cut away, (b) is a partially enlarged view of (a), and shows a state immediately before the key is attached to the chassis.

FIG. 2 is a perspective view showing a part of a key of the keyboard device shown in FIG.

3 is a perspective view showing a part of a chassis of the keyboard device shown in FIG. 1. FIG.

FIG. 4A is a schematic view showing how a key without a spring fall prevention wall is attached to the chassis to show the action of the spring fall prevention wall, and FIG. 4B shows the action of the rib.
It is a schematic diagram which shows a mode that a key is attached to the chassis without a rib.

FIG. 5 is a side view showing a keyboard device according to a second embodiment of the present invention.

6 is a plan view showing the rib of FIG. 5. FIG.

FIG. 7 is a side view showing a rib of a keyboard device according to a third embodiment of the present invention.

FIG. 8 is a side view showing a first modification of the rib shown in FIG.

9 is a side view showing a second modification of the rib shown in FIG.

10 is a plan view showing the rib of FIG. 9. FIG.

FIG. 11 is a plan view showing a third modified example of the rib shown in FIG.

FIG. 12 is a plan view showing a fourth modification of the rib shown in FIG.

13 is a plan view showing a fifth modified example of the rib shown in FIG.

FIG. 14 is a plan view showing a sixth modification of the rib shown in FIG.

FIG. 15 is a cutaway view showing an example of a conventional keyboard device.

16 is an enlarged view showing a chassis and a coil spring of the keyboard device shown in FIG. 15 in an enlarged manner.

[Explanation of symbols]

 60 keyboard device 70 chassis 72 first protrusion 74, 120, 130, 140, 150, 160 rib 90 key 92 upper wall 92a wall surface 94 both side walls 94a taper 96 one end 98 second protrusion 110 spring fall prevention wall 110 Coil spring 110a Outer wall 114 Other end

Claims (7)

[Claims] 1. A chassis and a generally U-shape open to the side of the chassis, which has one end supported by the chassis so as to be rotatable in a direction extending in a predetermined longitudinal direction and contacting with and separating from the chassis. A keyboard device comprising a key having an upper wall and both side walls in cross section, and a coil spring interposed between the key and the chassis and biasing the key in a direction of separating the key from the chassis. A first protrusion that protrudes toward the key and that enters one end of the coil spring, and the first protrusion that is formed at a position adjacent to the first protrusion in the longitudinal direction A rib that protrudes toward the key along the outer wall of the coil spring is provided on the chassis side, and the rib protrudes toward the chassis from the wall surface of the upper wall of the key that faces the chassis, Ko A second protrusion that enters the other end of the spring, and an outer wall of the coil spring that is formed at a position adjacent to the second protrusion in the longitudinal direction and in which the second protrusion enters And a spring fall prevention wall projecting toward the chassis on the key side. 2. The keyboard device according to claim 1, wherein the spring fall prevention wall has a protrusion amount larger than that of the second protrusion portion. 3. The spring fall prevention wall is a semi-cylindrical wall curved along the outer wall of the coil spring, into which the second protrusion is inserted, according to claim 1 or 2. Keyboard device. 4. The chassis-side ends of the opposite side walls of the key facing the second protrusion are formed in a tapered shape that opens larger toward the chassis. The keyboard device according to any one of claims 1 to 3. 5. A chassis and an overall U-shape open to the side of the chassis, one end of which is supported by the chassis so as to be rotatable in a direction extending in a predetermined longitudinal direction and contacting with and separating from the chassis. A keyboard device comprising a key having an upper wall and both side walls in cross section, and a coil spring interposed between the key and the chassis and biasing the key in a direction of separating the key from the chassis. The coil spring protruding toward the key and entering one end of the coil spring, and the coil spring formed at a position where the distance between the coil spring and the coil is shorter than the diameter of the wire of the coil spring. And a rib extending along the outer wall of the coil spring on the chassis side, and the coil spring is formed by press-fitting a wire of the coil spring between the rib and the protrusion. 6. The keyboard device according to claim 5, wherein the rib has a convex portion whose tip abuts on the strand of the coil spring into which the protrusion is inserted. 7. The keyboard device according to claim 5, wherein the rib has a spring property for urging the strand of the coil spring, into which the protrusion is inserted, toward the protrusion. .