According to ChatGPT, "An upright piano action is a mechanical system that translates the player's touch on the keys into the striking of hammers against the strings, producing sound. The action consists of a series of interconnected parts, including the keys, wooden levers, hammers, and dampers. When a key is pressed, it triggers a complex sequence of movements: the key pivots on a fulcrum, activating a lever that pushes a hammer towards the strings. The hammer then strikes the strings, creating sound waves, before the damper falls back into place to silence the strings when the key is released. The action in an upright piano is compact, with the components arranged vertically, allowing for a more space-efficient design compared to grand pianos. Despite its smaller size, the upright action is capable of offering nuanced touch and response, providing the player with a wide dynamic range and expressive control."
The piano action looks like this in the piano.
I had an old Wurlitzer upright action in my office from a piano I took apart for scrap. I used it to learn techniques and try out repair methods. I got tired of it taking up space and decided to tear it apart. There are a lot of parts in a piano!
The action brackets hold everything together and mount the action in the piano.
Look at all those screws!
Hammers
Dampers
Wippen and jack assembly
Damper rails and mounting boards
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