La malle aux accordeons

Mechanical principles of the accordion: air flow paths

The Melody: Button, Pallet.

As described previously, the reed rank is a kind of wood harmonica on which reed-fitted plates are laid. 

When air flows through the rank in the right direction, the reed vibrates.

Each button on the accordion is connected to a mechanism which allows one or more pallets to be lifted.

Pressing a key on the fingerboard raises the pallet and allows air to flow across the reed.

Right hand of a study chromatic button accordion: 

figure 1 - no sound produced
accordion air mechanism
figure 2 - air reaches the reeds
accordion working air mechanism

Example of a 2-voice, 80-bass accordion, as depicted above:

Pigini top prince II

Accordéon Pigini Top Prince 2