====== Winding ======
**Winding** stores mechanical energy in the [[mainspring]].

===== Key winding =====
In former times watches (e.g. [[pocket watch]]es in the beginning) were wound using a key. The key turned the square end of the [[spring core shaft]] of the [[barrel]] around which the [[mainspring]] is coiled. See also [[auger shaft]], [[worm shaft]]

===== Self winding =====
Invented in [[1842]] by [[Philippe, Jean-Adrien|Jean-Adrien Philippe]], **crown winding** allows one to use the [[crown]] of the watch to turn the barrel and wind the mainspring. This method is also known as **self winding**, **keyless winding**, or **hand winding**.

[[LeCoultre, Charles Antoine|Charles Antoine Jaeger-LeCoultre]] is also named as originator of the crown winding. In [[1847]] he invented a crown winding with a rocker, which allowed both winding and adjusting the hands using a single crown. Today, the LeCoultre method is typically used for all watches. The switching mechanism functions via pulling out the crown to the required position, in which one of the desired functions can be performed. Watches may include one, two, or even more crown positions for various functions, including winding, setting the main time or [[second time zone]], and setting the day and date.

Other methods of keyless winding were also developed for [[pocket watch]]es, including the [[pumping lift]], the [[remontoir]] and [[case winding]].

===== Automatic winding =====
Many modern watches include an **automatic winding** mechanism. Here, the winding of the movement happens automatically by the movements of the wearer's wrist, which sets a rotating [[weight segment]] ([[rotor]]) in motion. (For details see [[Automatic winding]].)

Note that many automatic movements may also be hand-wound. There is some debate as to whether this can damage the keyless works mechanism and clutches, however, and should be avoided with certain movements, including the popular [[ETA 2824-2]].

===== Literature =====
  *[[Das große Uhrenlexikon]]; Author [[Fritz von Osterhausen]]; ISBN 3898804305

===== See also =====
  * [[Automatic]]
  * {{tagpage>Manual_winding_movements|Manual winding movements}}


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