Keyboard device for keyboard instrument

A keyboard device for a keyboard instrument, comprising:

• a keyboard chassis;
• a plurality of keys provided on the keyboard chassis and each extending a predetermined length in a front-rear direction, the keys being arranged in a state arranged side by side in a left-right direction;
• and
• a plurality of key support mechanisms each provided in a state engaged with the keyboard chassis and arranged side by side in the left-right direction, each for supporting an associated one of the keys from below, the plurality of key support mechanisms each causing, upon depression of the associated one of the keys, the depressed key to operate such that the key pivotally moves about a virtual pivot located rearward of a rear end of the key,
• wherein the key support mechanisms each include:
• a first arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a first pivot shaft provided on the keyboard chassis, the first arm including a first arm front-side connecting portion which is disposed forward of the first pivot shaft and is pivotally and/or slidably connected to a key front-side connecting portion provided on a front portion of the associated key, and
• a second arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a second pivot shaft provided on the keyboard chassis at a location rearward of the first pivot shaft, the second arm including a second arm rear-side connecting portion which is disposed rearward of the second pivot shaft and is pivotally connected to a key rear-side connecting portion provided on a rear portion of the associated key, and a second arm front-side connecting portion which is disposed forward of the second pivot shaft and is pivotally and/or slidably connected to a first arm rear-side connecting portion rearward of the first pivot shaft of the first arm, and
• wherein at least two of the key and the first and second arms of each key support mechanism which supports the key are arranged such that center lines of the at least two extending along their longitudinal directions coincide with each other, as viewed in plan view.

A keyboard device for a keyboard instrument, comprising:

• a keyboard chassis;
• a plurality of keys provided on the keyboard chassis and each extending a predetermined length in a front-rear direction, the keys being arranged in a state arranged side by side in a left-right direction;
• and
• a plurality of key support mechanisms each provided in a state engaged with the keyboard chassis and arranged side by side in the left-right direction, each for supporting an associated one of the keys from below, the plurality of key support mechanisms each causing, upon depression of the associated one of the keys, the depressed key to operate such that the key pivotally moves about a virtual pivot located rearward of a rear end of the key,
• wherein the key support mechanisms each include:
• a first arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a first pivot shaft provided on the keyboard chassis, the first arm including a first arm front-side connecting portion which is disposed forward of the first pivot shaft and is pivotally and/or slidably connected to a key front-side connecting portion provided on a front portion of the associated key, and
• a second arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a second pivot shaft provided on the keyboard chassis at a location rearward of and higher than the first pivot shaft, the second arm including a second arm rear-side connecting portion which is disposed rearward of the second pivot shaft and is pivotally connected to a key rear-side connecting portion provided on a rear portion of the associated key, and a second arm front-side connecting portion which is disposed forward of the second pivot shaft and is pivotally and/or slidably connected to a first arm rear-side connecting portion rearward of the first-pivot shaft of the first arm, and
• wherein the keyboard chassis is provided with an arm assembling opening open at least either upward or forward, for assembling the first arm and the second arm to the keyboard chassis.

A keyboard device for a keyboard instrument, comprising:

• a keyboard chassis;
• a plurality of keys provided on the keyboard chassis and each extending a predetermined length in a front-rear direction, the keys being arranged in a state arranged side by side in a left-right direction and including white keys and black keys;
• and
• a plurality of key support mechanisms for the white keys and the black keys, each provided in a state engaged with the keyboard chassis and arranged side by side in the left-right direction, each for supporting an associated one of the keys from below, the plurality of key support mechanisms each causing, upon depression of the associated one of the keys, the depressed key to operate such that the key pivotally moves about a virtual pivot located rearward of a rear end of the key,
• wherein the key support mechanisms each include:
• a first arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a first pivot shaft provided on the keyboard chassis, the first arm including a first arm front-side connecting portion which is disposed forward of the first pivot shaft and is pivotally and/or slidably connected to a key front-side connecting portion provided on a front portion of the associated key, and
• a second arm configured to extend a predetermined length in the front-rear direction and be swingably engaged with a second pivot shaft provided on the keyboard chassis at a location rearward of the first pivot shaft, the second arm including a second arm rear-side connecting portion which is disposed rearward of the second pivot shaft and is pivotally connected to a key rear-side connecting portion provided on a rear portion of the associated key, and a second arm front-side connecting portion which is disposed forward of the second pivot shaft and is pivotally and/or slidably connected to a first arm rear-side connecting portion rearward of the first pivot shaft of the first arm, and
• wherein in the key support mechanisms for the white keys and the black keys, at least either the first arms or the second arms are constructed similar to each other in shape and size.