Action part for piano

Abstract

Provided is an action component of a piano which has high rigidity while maintaining advantages that synthetic resin has and then can obtain an equivalent sound volume of the piano with smaller key depression energy and can improve the responsiveness of an action. The action component 1 of the piano rotates as a key is pressed to transmit key pressing energy of the key to a hammer, and is formed of a molding of thermoplastic resin which is formed by a long fiber method and contains long fiber for reinforcement.

Description

technical field [0001] The present invention relates to a string hammer unit for a piano which pivotally moves with depression of a key to thereby transmit key depression energy generated by the depression of the key to a hammer. Background technique [0002] Generally, a boat is one of the action parts of a grand piano, said boat is made of wood and pivots at its rear end for movement around its pivot (hereinafter, the The forward side as seen from the player is called "rear"). The canoe is placed on the rear of the key. When pushed up by depressing the key, the boat lever pivots upward and moves in an interlocking fashion other hammer parts, such as the lifting lever, thereby pivoting the hammer upward for striking Strings stretched over it. Afterwards, the boat lever pivots downwards by gravity and brings into contact with the rear of the key, thus making the key ready for the next depression. As described above, the boat is one of the main hammer components for trans...

AI Technical Summary

Problems solved by technology

However, wood is inferior in machining accuracy when compared with a synthetic resin, and this situation makes adjustments required in the manufacture of hammerheads troublesome.

In addition, wood undergoes large dimensional changes due to drying and humidification, a condition that makes the wooden canoe easily misaligned in positional relationship to other hammer parts

This makes it difficult to maintain the normal motion of the hammer

[0005] On the other hand, the canoe made of synthetic resin does not have the above-mentioned inconvenience caused by the above-mentioned wooden canoe, but since the rigidity of the synthetic resin is lower than that of wood, the pivoting speed of the hammer is reduced.

As a result, to get the same volume, a greater key press energy must be used

In addition, since the synthetic resin has a larger specific gravity than wood, the movement of the canoe becomes slow, and this slow movement reduces the responsiveness of the hammer action while causing a delay in hammering the strings.

In addition, the large specific gravity of the synthetic resin increases the weight of the entire hammer including the boat, and thus in order to obtain the same touch weight as the above-mentioned wooden boat, it is necessary to increase the amount of the above-mentioned weight fixed to the keys.

[0006] Metal boats do not have the inconvenience caused by wooden boats, and are the same as synthetic resin boats, but because metal has a larger specific gravity than synthetic resin, the delay in hammering the strings and the key more significant weight gain

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