JPS6321007Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a keyboard device for a keyboard instrument such as an electric piano or an electronic organ.

Conventionally, as a keyboard device, in order to energize the keys,
A leaf spring made of spring steel or other elastic material can be attached by gluing or screwing both ends to the keyboard frame and keys, or a coil spring can be attached by locking its ends to the keyboard chassis and keys. However, the installation efficiency was poor, and it was also difficult to remove the lock for inspection, repair, etc. Furthermore, the number of parts and man-hours increased, and unless care was taken to ensure that the spring was positioned accurately, there were performance problems such as variations in the pressing force of the key due to errors in the individual locking parts.

The purpose of the present invention is to provide a keyboard device that does not have the drawbacks of the conventional keyboard device, that is, to provide a keyboard device that facilitates the installation of springs, keys, etc., and also provides reliable positioning and less variation in performance. , the tip operation part of the key 1 is rotatably supported using the rear part of the key 1 as a fulcrum, and the tip operation part of the key 1 is biased upward by a spring 2 arranged at the bottom of the key 1. In the above spring 2, the spring 2 is attached to a base plate portion 2a.
It consists of a plurality of key biasing pieces 2b extending from this and a cut-and-raised piece 2c from the base plate part 2a, and the keyboard frame 3 is sandwiched between the base-board part 2a and the cut-and-raised piece 2c, It is attached to the keyboard frame 3.

The spring 2 has a plurality of key biasing pieces 2b bent upward from their roots to protrude from one side edge of the base plate 2a, as shown in the first figure, and cut into, for example, both left and right sides of the base plate 2a. A raised piece 2c is formed, and a positioning hole 2d is made in the center thereof.

As shown in the second figure, this spring 2 is made by inserting cut-and-raised pieces 2c, 2c into the holes 3a, 3a of the keyboard frame 3, and sandwiching the keyboard frame 3 between the cut-and-raised pieces 2c, 2c and the base plate 2a. and is attached to the keyboard frame 3. At this time, when the positioning hole 2d provided in the base plate 2a is engaged with the protrusion 4 provided in the keyboard frame 3, the spring 2 is positioned at a predetermined position on the keyboard frame 3, and the spring 2 is moved by the vertical movement of the key 1. It is also possible to reliably prevent the displacement of the position.

After attaching this spring 2 to the keyboard frame 3, the rear part of the key 1 is fitted into the hole 3c of the upright piece 3b at the rear of the keyboard frame 3, and the locking groove 1a at the rear part is inserted into the hole 3c.
The key 1 is rotatably supported by the keyboard frame 3 by being locked to the upper edge 3d of the keyboard frame 3. At this time, the key biasing piece 2 of the spring 2
Since b is deflected downward by key 1,
The reaction force urges the tip of the key 1 upward.

In FIG. 2, 1b is the lower opening of the key 1;
c is a downward protrusion, and 1d is an upper limit regulating portion of the key 1.

Incidentally, a positioning hole 2d is made in the base plate 2a of the spring 2 as shown in the first figure, and the hole 2d is made in the keyboard frame 3.
Instead of providing the protrusion 4 into which the keyboard frame 3 fits, a protrusion may be provided on the base plate 2a and a positioning hole may be provided on the keyboard frame 3.

FIG. 3 shows another embodiment of the present invention in which an inclined cut-out piece 3e is provided to lock the spring 2 to the keyboard frame 3. The piece 2b may be extended from the base plate 2a without being bent at its root.

In this way, according to the present invention, a plurality of key biasing pieces are extended from the base plate, and a leaf spring is provided with a cut-and-raised piece on the base plate, and the keyboard frame is formed by the cut-and-raised pieces and the base plate. Since the spring is attached to the keyboard frame by pinching, it is easy to attach and remove the spring from the keyboard frame, and the number of parts is small.
Further, there is an effect that variations in the pressing force of the key due to spring installation errors are reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a spring used in the keyboard device of the present invention, Fig. 2 is a partially cut-away side view of one embodiment of the present invention, and Fig. 3 is a partially cut-away side view of the main parts of another embodiment. It is. 1... Key, 2... Spring, 2a... Board part, 2b
...Key biasing piece, 2c...Cut-and-raised piece, 2d...Positioning hole, 3...Keyboard frame, 4...Protrusion.

Claims (1)

[Scope of utility model registration request] A type in which the tip operation part of the key 1 is rotatably supported using the rear part of the key 1 as a fulcrum, and the tip operation part of the key 1 is biased upward by a spring 2 arranged at the bottom of the key 1. In the spring 2, the spring 2 is connected to the base plate 2a.
It consists of a plurality of key biasing pieces 2b extending from this, and a cut-and-raised piece 2c from the base plate part 2a, and the keyboard frame 3 is sandwiched between the base-board part 2a and the cut-and-raised piece 2c. A keyboard device attached to a keyboard frame 3.