What Is Piano Action? - Parts of a Piano

The mechanism of the piano that drives the hammers to strike the strings when a key is pressed is called the "action." In this video, Texas Tim pulls out the action of a grand piano to see a bit of how it works.

When speaking about the history of the piano action, one must reference the repetition mechanism, or double escapement, invented by Sébastien Érard of France. This mechanism allows a pianist to repeat a note in quick succession without having to fully release the key. Up until the introduction of this repetition mechanism, when a key was pressed, the hammer usually rose and struck the string and was not ready for the next keystroke, until it had gone back to its at-rest position. Erard's invention made it possible to prepare for the next keystroke even though the hammer hadn't completely made it all the way back to its at-rest position

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