Method and a device for adjusting the pitch and stopping the rotation of the blades of a wind turbine

A device for controlling the pitch angle of a wind turbine blade of a wind turbine comprising:

• a main shaft rotatably connected to a base part of the wind turbine, and at least one blade connected to the main shaft, the connection enables rotation of the blade about a longitudinal axis of the blade;
• and
• pitch angle altering means connected to the at least one blade for altering the pitch angle of said blade, and said pitch altering means comprising a bevel gear with a drive wheel being rotated by at least one synchronizing shaft and drive pinions for turning the at least one blade at an angle;
• the at least one synchronizing shaft connecting activatable driving means with the pitch angle altering means, at least a part of the synchronizing shaft being aligned with and extends along or parallel with a central axis of the rotatably connected main shaft, so that upon activation of the driving means a difference in angular rotation between the synchronizing shaft and the rotatably connected main shaft is introduced, as the pitch angle altering means is adapted to convert the angular rotation difference into a rotation of the at least one blade along its longitudinal axis, whereby the pitch angle of the at least one blade is altered by activating the driving means, said pitch controlling device further having the entire activatable driving means mounted on the rotatably connected main shaft.