JPH0114062Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a keyboard device for a musical instrument.

2. Description of the Related Art Conventionally, as shown in FIGS. 1, 2, and 3, a key of a keyboard device for a musical instrument has a keyboard 1 and a key arm 4 attached to each other by integral molding, adhesion, welding, press-fitting, or the like. The keyboard 1 is made of synthetic resin or the like and is formed into a substantially U-shape, and has a key rest 2 at the front of the keyboard and ribs 3 at the front and rear.The keyboard 1 is attached to a key arm 4 by the ribs. The key arm 4 has a fulcrum part 5 at the lower part of the approximately central part, and is pivotably connected to a center rail 7 fixed to a shelf board 6, and a pilot 8 is provided on the upper surface of the rear part of the key arm to carry an action, a switch, etc. make it work. A weight 9 is provided at the rear of the key arm to assist in key operation. Buffer members 10 and 11 are provided in front of the shelf board 6 opposite to the key holder 2 to regulate the height and sink amount of the keyboard. As shown in Fig. 3, the keyboard 1 is formed into a substantially U-shape with an open bottom surface, so it tends to curve upward due to the residual stress and shrinkage balance during resin molding. If they are attached together, there will be a gap between the opposing surfaces, and if many keyboards are lined up, the keyboard surfaces will be uneven.Since the key rest 2 is located at the front of the keyboard 1, the heights of the front parts are approximately the same, but the heights of the keyboard 1 are approximately the same. There was a drawback that the height of the rear part was uneven, and the rear part of the key arm 4 was uneven, making it necessary to adjust the height of the pilot 8.

The present invention eliminates the above-mentioned drawbacks, provides a keyboard device with good keyboard arrangement accuracy, and improves the appearance quality.In order to improve the appearance quality, a protrusion is provided on the surface where the keyboard and key arm face each other, and the protrusion allows the keyboard to be pressed in the vertical direction. The gap 12 created by the protrusion causes the key arm to come into contact with the key arm and cause the keyboard to warp in the vertical direction.
It is absorbed by

There are seven types of keyboard shapes within one octave,
The shapes of these molds differ greatly, and it is nearly impossible to make the precision of the parts uniform between the molds, even if we make full use of mold manufacturing technology and resin molding technology, and the present invention is particularly intended to solve this problem.

Figures 4 and 5 are views showing an embodiment of the present invention. In Figure 4, the keyboard 1 is made of synthetic resin and is molded into a substantially U-shape, with a key rest 2 at the front and ribs 3 at the front and rear.
The keyboard 1 is attached to the key arm 4 by means of ribs. A protrusion 13 provided at a portion facing the tip of the key arm and the rear of the keyboard 1 is configured to abut against a receiving portion 14 of the keyboard 1.

The keyboard 1 and the key arm 4 abut in the vertical direction at the protrusions 13, and the warpage caused by resin molding of the keyboard 1 can be absorbed by the gap 12 formed between the keyboard 1 and the key arm 4. When a large number of keyboards are arranged, the vertical positional relationship of each keyboard is based on both protrusions of the key arm, so that it is possible to construct a keyboard device with a constant arrangement of keys. FIG. 5 shows a case where a protrusion 13 is provided on the keyboard 1, and a portion of the rib may also be used as the protrusion.

When the keyboard 1 is attached to the key arm 4, the warpage of the keyboard 1 is absorbed between the protrusions 13, and the positional relationship between the keyboard 1 and the key arm 4 is determined by the protrusions 13 and is constant, so that even if a large number of keyboards are arranged, the front of the keyboard The height of the key rest 2 is constant, and the height of the rear part is also constant without variation due to the relationship between the keyboard and the key arm, so there is no need to adjust the position of the pilot 8.

As described above, according to the present invention, a protrusion is provided between the keyboard and one end of the key arm, and a gap is created between the inner wall of the top surface of the keyboard and the key arm. It can be absorbed by the keyboard, and the alignment accuracy can be improved when a large number of keys are lined up.

[Brief explanation of the drawing]

FIG. 1 is a top view of a keyboard device, FIGS. 2 and 3 are sectional views of a conventional keyboard device, and FIGS. 4 and 5 are sectional views showing an embodiment of the present invention. 1 is the keyboard, 2 is the key rest, 3 is the rib, 4 is the key arm, 5 is the fulcrum, 6 is the shelf board, 7 is the center rail, 8 is the pilot, 9 is the weight, 10, 11
12 is a cushioning material, 12 is a gap, 13 is a protrusion, and 14 is a receiving portion.

Claims (1)

[Scope of utility model registration request] The keyboard has a substantially U-shaped cross section with an open bottom surface, and a key arm that is attached to the keyboard and whose fulcrum part is rotatably supported by a center rail, and one end of the key arm and the inner wall are in contact with an inner wall on the top surface of the keyboard. A gap is formed between the inner wall of the top surface of the keyboard and the key arm by the protrusion, and the longitudinal warp of the keyboard that occurs on the top surface of the keyboard during molding is accommodated in the gap. A musical instrument keyboard device designed to eliminate variations when installed.