The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1988
Filed:
Mar. 12, 1987
Kazuo Murakami, Hamamatsu, JP;
Toshio Tajima, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
An actuator for an automatic performance piano, includes electromagnetic plunger units provided in correspondence to and adjacent to a plurality of keys of the piano, each of the electromagnetic plunger units having an excitation coil and a plunger, and a key drive portion, provided at the distal end of the plunger for driving the key. The electromagnetic plunger units are arranged along the key arrangement direction to be deviated from each other in the front-back direction of the key in a staggered manner. A motion stroke of the key drive portion of the electromagnetic plunger unit in one row is made smaller than a motion stroke of the key drive portion of the electromagnetic plunger unit in the other row.