| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a dag of a grand piano which is capable of positioning a keyframe to the prescribed position in a longitudinal direction, smoothly guiding the movement of the keyframe accompanying a pedal operation and holding the keyframe on a keybed without shaking. SOLUTION: The dag 25 of the grand piano has a main body section 26a which is fixed to the prescribed position at the rear of the keybed 2, a roller 35 which is disposed at the main body section 26a freely movably in the longitudinal direction, freely rotatably around the axis in a perpendicular direction and touches the back of the keyframe 3, a roller positioning means 28 which positions this roller 35 in the longitudinal direction and a stopper 29 which has an eaves section 26b forward projected with the main body section 26a, is freely advanceably and retreatably screwed vertically to this eaves section 26b and touches the top surface of the keyframe 3.</p> |
