JACK MOTION-RESTRICTING DEVICE FOR UPRIGHT PIANO

摘要

A jack motion-restricting device for an upright piano is provided to stably obtain an operation intended by a jack without changing the thickness of a base layer although a neighboring environment condition including moisture is changed. A jack motion-restricting device for an upright piano includes an action(1), a keyboard(2), a hammer(3). The keyboard includes a plurality of keys(2a) arranged in a longitudinal direction of the upright piano. Each of the keys is extended to front and rear directions. The keyboard has a central portion rotatably supported by a balance pin(5a) erected from a key frame(5) on a key bed. A back rail(6) is arranged at a rear place of the key frame to be received at a rear end of each key. The jack motion-restricting device further includes a butt pelt(16) having a base layer and a surface layer. The base layer is attached to the base member and the surface layer is attached to the base layer to be in contact with the jack.