structure used in piano actions to provide controlled rotational resistance

Abstract

The invention discloses a structure for providing a controlled rotating resistance in piano actions. The structure comprises the substrate of an action lever part made from a non-moisture-absorbent composite material, wherein mounting holes are formed in the rotating center of the substrate, a hard sleeve which is matched and embedded in the mounting holes and is made from a non-moisture-absorbent self-lubricating plastic material, and a central pin which runs through the central through hole of the hard sleeve and is in interference fit and connection to the central through hole; inside an action lever structure, the end of the substrate serving as a rotating center supporting part is in the form a U-shaped fork; the round mounting holes are respectively formed in two branches at the end of the U fork-shaped substrate and the central axes of the two mounting holes are overlapped; and the part around the positions of the mounting holes on the substrate part used as a rotating lever is configured with a thickness matched with a distance between the two branches at the end of the U fork-shaped substrate. Through the above structures, the structure can be used for keeping stable actions during the varying period of environment humidity and can be used for providing a controlled rotating resistance, which is beneficial for a pianist to play the piano.

Description

technical field [0001] The invention relates to the technical field of piano actions, in particular to a structure used in a piano action to provide controlled rotation resistance by using an interference-fit hard sleeve. Background technique [0002] A piano action is the heart of a piano, with each moving part being a rotating lever. It provides a center of rotation through a swivel connection, which must be fixed in some way. For the main part, this is achieved by fastening the axle bracket to the bar so that the center of rotation is fixed to the bar. For other parts, the center of rotation is located on one of the main levers of the action, so that when the main lever rotates around the fixed center of rotation, the jack or balance bar can rotate within the corresponding range, so as to push the hammer to strike. The effect of hitting the strings. [0003] In the piano action, the center of rotation also provides a certain amount of damping, allowing the pianist to f...

AI Technical Summary

Problems solved by technology

In the piano action, once the rotation resistance changes, the transmission action of the action will deviate, which will affect the piano performance

Also, previous pin bushings were soft made of felt material, which is hygroscopic, and they tended to provide a "soft" support for the center pin, not only causing the lever parts to potentially rotate in a less precise trajectory, but also When the environment around the instrument changes, the rotation resistance changes after the pin sleeve absorbs moisture

This situation is more obvious than the change of wood. In practice, users often cause high maintenance costs due to this reason.

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