Tuning device

The utility model discloses a koto inflexion device used for adjusting the tones of strings specially used for the koto. The koto inflexion device comprises a front bracket, a back bracket, an arc pressure rod and a string pressing device; the front bracket is an L-shaped plate and the upper end is provided with a shaft; the bottom end is connected with a connector at one side of a koto body; the front end of the arc pressure rod is provided with a hole in which the shaft of the front bracket arranged; the back bracket is a slot body which consists of a back bracket base, a back bracket connection plate and the fixing plate of a pressure rod fixing plate; the pressure rod tightly presses and fixes the back end of the arc pressure rod; the back bracket base is fixed on a connector at the other side of the koto body; the string pressing device is arranged on the arc pressure rod and comprises an adjusting screw and a string pressing post; the string pressing post is arranged on the adjusting screw; when in use,