JPS6237266Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a key support device for a keyboard instrument.

Conventionally, in the keyboard of an electronic musical instrument, a weight is fixed at the rear of the key arm in order to obtain the touch feeling of the key, and a frictional force is added to the support part to pivot the key arm, and the weight is fixed at the lower front position and the rear part of the arm. A key support device is known in which a stopper is disposed at an upper position to provide a touch feeling similar to that of a piano. In this case, a stopper is provided at the rear upper part to prevent the weight from jumping up when the key is pressed down strongly, but there is a disadvantage that the stopper also reacts on the support, making it difficult to prevent the fulcrum from moving upwards or downwards. Ta.

The present invention was developed in view of the above points, and a hole is provided in the rotation support part of the key arm, and the support is penetrated by a shaft that fits from both sides, making the key and support rotatable. To provide a key support device for a keyboard instrument in which a stopper is provided at the lower front or upper rear by inserting and fixing the key into the center rail so that the key does not jump up.

This invention will be explained in detail below based on one embodiment of the accompanying drawings.

In FIG. 1, a key arm 1 has a keyboard 2 fixedly attached to the front thereof, and a hole 5 is provided at the pivot point of the key arm 1. The rear part of the key arm 1 is equipped with a weight or an action mechanism to produce the feeling of a key being touched, or in the case of an electronic musical instrument, can operate a contact circuit mechanism. The key arm 1 is rotatably supported by a support 3 in a hole 5. Support 3 is center rail 6
the center rail 6 or shelf board 1 through the screw 9 with the stopper 8 from above the support 3.
Fixed at 0. A key guide member 12 is fixed to the front rail 11 to guide the keyboard 2. The stopper 7 is a band-shaped cushioning member made of felt, etc., which stops the keyboard when a key is pressed and provides a good touch feeling after the key is pressed. Another method of fixing the support 3 to the center rail 6 is to provide stoppers 3h, 3'h on the support 3 as shown in FIG. 3 is one in which it is not possible to move upward.

In Figure 2, support 3 is inserted into hole 5 of key arm 1.
Insert the cylindrical part 3a of the support 3' and insert the cylindrical part 3a of the
Hold b′ between the key arm 1 and the cylindrical part 3 of the support 3.
Fit into the recessed part a, and insert the support into the key arm. The convex portion 3b of the support 3 also fits into the concave portion of the cylindrical portion 3a' of the support 3' in the same manner as described above. A portion 1b necessary for the rotational stroke of the key arm is formed in a shape with a radius R from the hole portion 5, and portions 1a and 1c having a radius larger than R are provided on both sides of the 1b portion, and the cylindrical portion 3a' of the support 3 forms the key arm 1. 1a and 1c, the support 3 and the key arm 1 are designed not to rotate more than necessary. Supports 3, 3' attached to the key are grooves 3c, 3
It is inserted into the center rail 6 via d, 3f, 3d', 3c', 3e' and fixed with the stopper 8 as described above. Support 3g, 3h, 3j, 3g', 3
The protrusions h' and 3i' prevent the key arm 1 from wobbling laterally. The supports 3, 3' can also be a common part as described above. If they are not shared, protrusions 3h, 3i, 3g', 3j' are not required, and 3g, 3j' are not required.
The protrusions of j, 3h' and 3i' make it possible to guide the key arm over the full width of the key arm and at the same time apply lateral pressure due to the elasticity of the support, providing highly accurate guidance. . Adjust the outer diameter of the cylindrical part 3a of the support 3 to the hole 5 of the key arm 1.
It is formed slightly smaller than the diameter of the hole 5, so that even if a burr occurs near the circumference of the hole 5, the burr and the support do not come into direct contact with each other, thereby providing smooth rotation of the key.
It is also possible to arrange the shaft portion of the support 3 to rest directly on the 6b portion of the center rail 6, so that when the key is pressed, weight is not applied to the base of the shaft portion of the support 3 and the shaft portion does not break. . The center rail 6 is provided with a recessed portion 6a so that when the support is removed from the center rail 6, it can be removed without sliding to the upper part of the center rail.

Further, the cross-sectional shape of the shaft portion of the support 3 is not limited to a circular shape, but may be any shape that allows the key arm to rotate freely.

As mentioned above, since the cylindrical part of the support passes through the hole in the key arm, the key arm does not jump up on the fulcrum when a key is pressed strongly, and the effect of providing a keyboard with a good touch feeling with a simple structure is great. be.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a keyboard showing an embodiment of the keyboard device of the present invention, Fig. 2 is an enlarged explanatory view of the main part of the support shown in Fig. 1 as seen from the direction of arrow A, and Fig. 3 is a center view of the keyboard. An explanatory diagram of the fitting part of the rail, Fig. 4 is a perspective view of the support, Fig. 5 is an explanatory diagram of the penetration hole of the key arm, and Fig. 6 is an enlarged explanatory diagram of the main part when the protrusion of the support is provided. It is. 1 is a key arm, 2 is a key, 3 is a support, 5 is a hole, 6 is a center rail, 7 is a stopper, 8 is a stopper, 9 is a screw, 10 is a shelf board, 11 is a front rail, 12 is a key guide member be.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A key arm that is fixed to a keyboard and rotatably supports the keyboard, a hole provided in the key arm that serves as a pivot point for the key arm, and a cylindrical portion that passes through the hole that fits together. The keyboard is rotatably supported by a pair of supports that form a rotation axis of the key arm, a groove provided in the support, and a center rail that holds the support by fitting the groove of the support into a recess provided in the center rail. A key support device for a keyboard instrument characterized by: (2) A keyboard according to claim (1) of the utility model registration, comprising a pair of supports having the same shape, each of which has a cylindrical part that passes through a hole in a key arm and a fitting part that fits into the cylindrical part. Instrument key support device. (3) Two cylindrical parts are formed on a pair of supports, one cylindrical part serves as a rotation axis, and the other cylindrical part contacts one side of the key arm when the key arm rotates, preventing the key arm from rotating. A key support device for a keyboard instrument as set forth in claim (1) of the utility model registration claim, which comprises a blocking piece. (4) A key for a keyboard instrument as set forth in claim (1) of the utility model registration claim, which comprises a pair of supports formed with protrusions that sandwich the key arm to apply lateral pressure to the key arm and prevent the key arm from wobbling. Support device.