| 摘要 |
PURPOSE:To prevent lengthening of a positioning control mechanism for a screen and simplify adjustment of stopping position by providing the plural number of steps of planetary gear mechanisms and a clutch mechanism on the winding shaft of a winding device for a screen such as a blind or the like. CONSTITUTION:The plural number of steps of planetary gear mechanisms 29-32 coupled with regular/reverse output of a winding shaft 2 are continuously provided, while a clutch mechanism 80, which conducts and intercepts regular and reverse output of the winding shaft 2, is provided between the output side of the winding shaft 2 and the input side of said planetary gear mechanisms 29-32. Regular/reverse output of the winding shaft 2 is conducted to and intercepted from said planetary gear mechanisms 29-32 through the clutch mechanism 80. Said mechanisms 29-32 are provided with respective internal gears with different ratio of rotation, and engagement grooves are carved axially on the outer periphery of these internal gears. A position detecting switch, which detects a time when engagement grooves coincide in axial direction with each other, is provided and stoppage of a motor 24 is controlled by means of this switch. |
