Blind operating device

摘要

There is provided a blind operating device for transmitting a rotation in both directions from an operation portion to a driving axis of the blind capable of making a diameter of a clutch spring smaller, and then capable of reducing operation load without breaking the clutch spring. The blind operating device includes an input shaft 30 into which a rotation from a pulley 20 is inputted, and a rotation axis 32 that is provided coaxially with the input axis 30 and is capable of transmitting the rotation to the driving axis. A clutch spring 34 is wound around a fixed spring winding axis 14b of a case 14 and a rotation spring winding axis 32c of the rotation axis 32. Linking and de-linking of the rotation axis 32 and the case 14 is made possible utilizing tightening and loosening of the clutch spring 34 and one end of the clutch spring 34 is linked to the rotation axis 32. When the rotation in one direction is inputted to the input axis 30, a part of the clutch spring 34 wound around the fixed spring winding axis 14b loosens starting from a rotation spring winding axis 32c side, whereby the rotation axis 32 is allowed to rotate with the input axis 30.