JPS60145489U

JPS60145489U - Actuator for automatic piano performance equipment

Info

Publication number: JPS60145489U
Application number: JP3262684U
Authority: JP
Inventors: 繁村松; 善樹西谷
Original assignee: ヤマハ株式会社
Priority date: 1984-03-07
Filing date: 1984-03-07
Publication date: 1985-09-27

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はピアノ自動演奏装置のドライブユニットを構成
するアクチュエータ及びキーセンサーユニットの鍵に対
する配置関係を示す断面図、第２図は従来のアクチュエ
ータの構造例を示す断面図、第３図は同アクチュエータ
のストローク−推力特性図、第４図はピアノ自動演奏に
適したストローク−推力特性図、第５図はこの考案の一
実施例を示す断面図、第６゛図は同実施例における上補
助ヨークの斜視図、第７図は同実施例における下補助ヨ
ークの斜視図、第８図ａ、　ｂは上補助ヨークの形成方
法を説明するための展開図である。１・・・鍵、３・・・キーセンサーユニット、２１・・
・上部ヨーク、２２・・・下部ボーク、２３・・・ソレ
ノイドコイル、２４・・・ボビン、２５・・・上補助ヨ
ーク、２５Ａ・・・凹凸端、２６・・・下補助ヨーク、
２７・・・プランジャ、２８・・・アクチュエータヘッ
ド、２９・・・ばね。Fig. 1 is a cross-sectional view showing the arrangement of the actuator and key sensor unit that constitute the drive unit of an automatic piano performance device with respect to the key, Fig. 2 is a cross-sectional view showing an example of the structure of a conventional actuator, and Fig. 3 is a cross-sectional view of the same actuator. Figure 4 is a stroke-thrust characteristic diagram suitable for automatic piano performance, Figure 5 is a sectional view showing an embodiment of this invention, and Figure 6 is a diagram of the upper auxiliary yoke in the same embodiment. FIG. 7 is a perspective view of the lower auxiliary yoke in the same embodiment, and FIGS. 8a and 8b are developed views for explaining the method of forming the upper auxiliary yoke. 1...Key, 3...Key sensor unit, 21...
・Upper yoke, 22... Lower balk, 23... Solenoid coil, 24... Bobbin, 25... Upper auxiliary yoke, 25A... Uneven end, 26... Lower auxiliary yoke,
27...Plunger, 28...Actuator head, 29...Spring.

Claims

[Scope of utility model registration request]

A solenoid coil that is wound around a bobbin and is excited based on information regarding the movement of keys on a piano keyboard, an upper yoke that forms part of a magnetic path, and a lower yoke that forms a magnetic path that is connected to the upper yoke. A plunger formed into a round bar shape and arranged so as to be able to move freely in the axial direction using the inner surface of the bobbin as a guide, an actuator head attached to the tip of the plunger, and a contact pressure to the key applied to the actuator head. a spring; an upper auxiliary yoke formed into a cylindrical body with one end having an uneven end and inserted into the upper end side of the bobbin with the uneven end facing downward;
An actuator for an automatic piano performance device, comprising a cylindrical lower auxiliary yoke inserted coaxially with the lower end of the bobbin.