itsestäänanvyvän

Itsestäänanvyvän is a Finnish term that translates to "self-winding" or "automatic" in English. It is most commonly used to describe a type of watch mechanism. In an automatic watch, the movement of the wearer's wrist provides the energy to wind the mainspring, which in turn powers the watch. This eliminates the need for manual winding, a common feature of traditional mechanical watches.

The self-winding mechanism typically consists of a rotor, a semi-circular weight that pivots freely on a central axis. As the wearer moves their arm, the rotor swings or spins, engaging a winding mechanism that tightens the mainspring. This stored energy is then gradually released to drive the watch's gears and hands. The efficiency of the self-winding mechanism can vary between different watch models, with some requiring more vigorous movement than others to maintain their power reserve.

The invention of the self-winding watch dates back to the 18th century, with significant advancements made in the 20th century leading to the widespread adoption of this technology. Modern automatic watches are appreciated for their convenience and the intricate engineering involved in their construction. They remain a popular choice for watch enthusiasts and those who prefer a mechanical timepiece without the daily task of manual winding.