| 摘要 |
PURPOSE:To automatically open or close a blind sheet by sensing the variation of light quantity. CONSTITUTION:This sheet blind apparatus has a winding roller 7 and a delivery roller 10 rotatably attached to both ends of a nearly rectangular frame 1, a guiding rod 8 placed in the frame in a state slidable along the frame 1, a light- shielding sheet 6 extended between the winding roller 7 and the guiding rod 8, a delivery rope 11 extended between the delivery roller 10 and the guiding rod 8, a winding mechanism 12 and a delivery mechanism 13 connected to the winding roller 7 and the delivery roller 10 through respective clutches, a light sensor 61 to detect the variation of light quantity, a sensor controller 60 to actuate the winding mechanism 12 or the delivery mechanism 13 by the signal transmitted from the light sensor and a stopper mechanism 30 to stop the action of the winding mechanism 12 or the delivery mechanism 13 and release the action of the clutch of the winding side or the delivery side. |
