Keyboard lid opening and closing mechanism for keyboard musical instrument and keyboard musical instrument

摘要

A keyboard lid opening and closing mechanism for a keyboard musical instrument having a simple structure and not requiring a large space for installation thereof. To house a keyboard lid in the folded state inside the keyboard musical instrument, the mechanism is provided with a reverse V-shape forming portion disposed at the place where the undersurface of the keyboard lid passes while moving, a rotation support portion including first connecting groove walls, and a keyboard lid stop portion including second connecting groove walls. Therefore, the structure of the mechanism for opening and closing the keyboard lid is simplified, and a large space for installation of the mechanism is not necessary since these portions include no movable parts.