Kabushiki Kaisha Kawai Gakki Seisakusho

Hideyuki Ishida

Akihiro Suzuki

Yasushi Terai

Masahiko Iwase

Mikhail Vasilievich Pletnev

Anton Anatolievich Nikitin

Akhiro Suzuki

A keyboard device having keys enabling sufficient weight of touch to be obtained in spite of being configured to be shorter in length than those of the grand piano and. Link mechanisms are each provided on a base for supporting an associated one of the keys from below and configured to cause the associated key to operate such that when a front end of the key is depressed, an amount of downward movement of a rear end of the key becomes approximately half of an amount of downward movement of the front end of the key. Each link mechanism includes front-side and rear-side key link bars and front-side and rear-side connecting link bars. The front-side and rear-side connecting link bars are pivotally supported, respectively, and are pivotally and slidably connected to each other via respective rear and front ends thereof.

Keyboard device including link mechanism

A hammer device of an electronic piano with keys which swing in accordance with key depression, includes a hammer support that is made of a synthetic resin and has a fulcrum shaft, and a hammer having a shaft hole part for being fitted on the fulcrum shaft and configured to pivotally move about the fulcrum shaft in a manner interlocked with the swinging key. The fulcrum shaft has an outer peripheral surface formed by a pair of arcuately-curved surface portions opposite to each other and a pair of planar surface portions each extending between the pair of arcuately-curved surface portions and parallel to each other.

Hammer device and keyboard device for electronic keyboard instrument

A keyboard device for an electronic keyboard instrument, including several keys arranged side by side in a left-right direction, a hammer support disposed rearward of the keys, a plurality of hammers pivotally supported by the hammer support to be pivotally moved in accordance with key depression, and a key switch having a plurality of switch bodies provided in association with the respective hammers and a switch board mounted to the hammer support. The hammer support has a hammer supporting part for supporting the hammers and a switch mounting part to which the key switch is mounted, and is formed by an injection molded article of a predetermined kind of synthetic resin.

Keyboard device for electronic keyboard instrument

A keyboard device for an electronic keyboard instrument, capable of ensuring stable contact between movable contacts and fixed contacts of a switch body, to accurately detect key depression information. A hammer has a pressure-applying surface formed in a predetermined configuration. A key switch detects key depression information and includes a substrate with fixed contacts, a hollow switch body with a pressure-receiving surface, and movable contacts provided inside the body. Pressing of the pressure-receiving surface by the pressure-applying surface sequentially brings the movable contacts into contact with the fixed contacts, causing switch body compressive deformation. The pressure-receiving surface and pressure-applying surface are complementary in shape, and an orientation of the former conforms to an orientation of the latter when hammer pivotal motion is terminated after the movable contacts are brought into contact with the fixed contacts.

A key switch for an electronic piano, which makes it possible to increase an allowable range for shift of a movable contact without increasing the size of the key switch of the three-contact type. The key switch includes a substrate having first to third stationary contacts arranged thereon side by side in the lengthwise direction of a pivotal member as one of a key and a hammer. Each stationary contact has a common contact and a non-common contact. The common contact has an extended portion extending between two non-common contacts. The key switch has first to third movable contacts arranged side by side on an elastic switch body, for being sequentially brought into contact with the common contacts and non-common contacts of the stationary contacts as the switch body is pressed by the pivotal member, to thereby output signals indicative of key depression information.

Key switch for electronic piano

A keyboard device for an electronic keyboard instrument, which enables facilitation of work for mounting and dismounting a key switch and install hammers and the key switch with high accuracy, and provision of a touch feeling similar to one provided by an acoustic grand piano while keeping the device compact in depth. The device comprises swingable keys, a hammer support formed by a synthetic resin molded article, hammers pivotally supported by the hammer support, and a key switch including switch bodies provided in association with the hammers and a switch board. The hammer support has a switch mounting part formed with an opening vertically extending therethrough. The key switch is removably mounted to the switch mounting part, with the switch bodies facing the hammers from above via the opening and the switch board placed on the upper surface of the switch mounting part.

Keyboard device for electronic keyboard instrument and mounting structure of let-off imparting member for electronic keyboard instrument

A hammer device for an electronic keyboard instrument, enabling prevention of grease or the like from adhering to an actuator portion during mounting of the hammer, to thereby enable speedy hammer mounting work and improve the work efficiency. The hammer device includes a hammer support and hammers arranged side by side in a left-right direction and each pivotally supported by the hammer support to pivotally move in accordance with depression of an associated key. When mounting the hammer to the hammer support, before a shaft hole is engaged with a fulcrum shaft portion, left and right protrusions of the hammer are brought into abutment with respective left and right stopper walls provided close to the respective left and right ends of the fulcrum shaft portion, to thereby prevent the actuator portion from being brought into contact with the fulcrum shaft portion.

Growing community of inventors

Hamamatsu, Japan

Hideyuki Ishida