Music – Instruments – General features
Patent
1996-12-17
2000-12-19
Martin, David
Music
Instruments
General features
84170, 84171, 84220, 84438, 84615, G10C 312
Patent
active
061629804
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an electronic upright piano provided with an action load simulation member providing an action simulating load onto a keyboard.
BACKGROUND OF THE INVENTION
Conventionally, in an electronic piano, electronic sound is issued from a loudspeaker, in response to an player's depressing or releasing a key or keys. Recently, such electronic sound was improved to reach a highly desirable level. The feel of the keys on the electronic keyboard has also been improved in various ways, in order to reach the feel of the keys of an acoustic piano.
Specifically, an electronic piano provided with an action load simulation member is developed, such that the touch of the keys approaches the touch of the keys of an acoustic upright piano. As shown in FIG. 9, such electronic piano is provided with a hammer arm P14 rotatable about a shaft P10 for depressing the rear end of a key P12. As shown in FIG. 10, another electronic piano is provided with a hammer arm P20 rotatable about a shaft P16 for pushing up a key P18, such that the tip of the key 18 is raised (refer to the Japanese Patent Application laid-open No.4-347895). The action load simulation members shown in FIGS. 9 and 10 are developed for use in an electronic upright piano, having a low roof top height, such that almost acoustic piano sound can be generated.
The key touch on the acoustic upright piano is now explained. As shown in FIG. 11, when a player depresses a key 111, a wippen 115 is rotated in the direction opposite to the rotary direction of the key 111 (counterclockwise as viewed in the figure) and is raised, and a jack 117, rotatably attached to the wippen 115, is raised to push up a hammer butt 118. The hammer butt 118 is in turn rotated together with a hammer shank 121 and a hammer head 123 in the direction opposite to the rotary direction of the key 111 (counterclockwise as viewed in the figure). The jack 117 is raised to a predetermined position where a jack tail 117a contacts the bottom of a regulating button 116, and is then released from the hammer butt 118. Consequently, the hammer butt 118, the hammer shank 121 and the hammer head 123 continued to be inertially rotated, thereby striking a string.
As aforementioned, in the acoustic upright piano, the wippen 115, the jack 117 and the hammer butt 118 are rotated about different axes, respectively. In addition, the jack 117 leaves the hammer butt 118 at a specified timing. The touch of the key 111 is complicated.
However, in the action load simulation member shown in FIG. 9 or FIG. 10, a dead weight is rotated about an axis. Therefore, the key touch is simpler as compared with the key touch of the acoustic upright piano.
DISCLOSURE OF THE INVENTION
The present invention has been developed to solve the aforementioned problem, and an object of the first aspect of the present invention is to provide an electronic upright piano providing a touch of keys of an acoustic upright piano. An object of the second aspect of the present invention is to provide a method of mass production of the electronic upright piano according to the first aspect of the present invention.
To attain the aforementioned object, the fist aspect of the present invention provides an electronic upright piano provided with an action load simulation member for applying an action simulating load to a keyboard.
The action load simulation member is composed of when a key is depressed and rotated, for rising when the key is depressed and the wippen equivalent member is rotated, member and being rotated, while the jack equivalent member is rising to a predetermined position, and leaving the jack equivalent member and moving inertially after the jack equivalent member reaches the predetermined position, and thereby stopping the movement of the hammer equivalent member.
The hammer equivalent member can be rotatably attached to the piano body and can be provided with a butt part for contacting and leaving the jack equivalent member, a bar-like hammer shank part connected to the butt part and a hammer pa
REFERENCES:
patent: 877603 (1908-01-01), Smith
patent: 5247129 (1993-09-01), Nozaki et al.
patent: 5287787 (1994-02-01), Satoshi
patent: 5386083 (1995-01-01), Kawamura
Reblitz, Piano Servicing, Tuning, and Rebuilding for the Professional, the Student, and the Hobbyist 1993, The Vertal Press.
Ishida Muneo
Kimura Masaji
Kitashima Riichi
Miwa Shinichiro
Hsieh Shih-yung
Kabushiki Kaisha Kawai Gakki Seisakusho
Martin David
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