JPH0229092U

JPH0229092U -

Info

Publication number: JPH0229092U
Application number: JP10745088U
Authority: JP
Priority date: 1988-08-16
Filing date: 1988-08-16
Publication date: 1990-02-23

Description

[Brief explanation of drawings]

図面はそれぞれこの考案の一実施例を示し、第
１図はこの考案による電子鍵盤楽器の鍵盤装置の
一部を省略した平面図、第２図は同鍵盤装置の縦
断面図、第３図および第４図は同鍵盤装置の作用
を説明した要部縦断面図、第５図は同鍵盤装置に
おける鍵タツチ特性を示した図、第６図および第
７図は同鍵盤装置を構成する第１のアクシヨンア
ームのカム部の変形形状を示す図、第８図および
第９図は第５図および第６図のカム部形状で得ら
れる鍵タツチ特性を示した図である。１……鍵盤シヤーシ、２……鍵、１１……第１
のアクシヨンアーム、１２……第２のアクシヨン
アーム、１２ｅ……ウエイト部、１４……支点軸
、１５……短尺部（第１のアクシヨンアームの一
端）、１６……押圧突起、１７……ころがり軸、
１９ａ……傾斜面、１９ｂ……カム面、１９ｃ…
…離脱面。 The drawings each show an embodiment of this invention, and FIG. 1 is a partially omitted plan view of a keyboard device of an electronic keyboard instrument according to this invention, FIG. 2 is a vertical cross-sectional view of the same keyboard device, and FIGS. Fig. 4 is a longitudinal cross-sectional view of the main part explaining the operation of the keyboard device, Fig. 5 is a diagram showing the key touch characteristics in the keyboard device, and Figs. 6 and 7 are the first parts of the keyboard device. FIGS. 8 and 9 are diagrams showing a modified shape of the cam portion of the action arm, and FIGS. 8 and 9 are diagrams showing key touch characteristics obtained with the cam portion shapes shown in FIGS. 5 and 6. 1...Keyboard chassis, 2...Key, 11...1st
Action arm, 12... Second action arm, 12e... Weight part, 14... Fulcrum shaft, 15... Short part (one end of first action arm), 16... Press projection, 17 ...Rolling axis,
19a... Inclined surface, 19b... Cam surface, 19c...
...Leaving side.

Claims

[Claims for Utility Model Registration] (1) A keyboard chassis, a key rotatably mounted on the keyboard chassis in the vertical direction, and a seesaw rotatably mounted below the key on the keyboard chassis. a first axion arm of the mold; a pressing protrusion that is vertically disposed on the lower surface of the key and presses against one end of the first axion arm; a second action arm that is attached and removably engaged with the first action arm, one end of which is pressed by the pressing protrusion when the key is pressed downward; The first action arm engaged with the first action arm and the second action arm engaged with the first action arm rotate upward about the fulcrum shaft, and the key is pressed to a predetermined position. Then, the second action arm, which continues to rotate upward together with the first action arm, separates from the first action arm, which continues to rotate upward, and this first action arm The second action arm separated from the lock is configured to be engaged with the first action arm again when the first action arm is in a return position by releasing the key. A keyboard device for an electronic keyboard instrument. (2) The first action arm has the second
The second action arm has an inclined surface with which the action arm engages, and a separation surface that is continuous to the separation surface via a cam surface. A rolling shaft that can slide between the surfaces is provided, and when the first action arm and the second action arm rotate upward about the fulcrum shaft by pressing the key. , when the rolling shaft of the second action arm slides on the inclined surface of the first action arm and the key is pressed to a predetermined position,
The rolling shaft sliding on the inclined surface moves from the inclined surface to the release surface via the cam surface, and the second action arm separates from the first action arm, and the key is released. When the first action arm is in the return position, the rolling shaft moves from the release surface to the inclined surface via the cam surface, and the second action arm returns to the first position. The keyboard device for an electronic keyboard instrument according to claim 1, wherein the keyboard device engages with an action arm. (3) Claim No. (1) characterized in that the second action arm is provided with a weight portion.
) or (2) above.