A rebound device used in running a pull cord provides for a retractable unit of a window blind to switch reversely a winding angle of the pull cord, upon rolling up the pull cord onto an inner radial side of a reel. The rebound device with an elastic action is disposed in the retractable unit opposite to an access opening of the reel, and includes an elastic tensile element or a gate-front shear set with an elastic function. In rolling up the pull cord, the pull cord is wound onto a coil on the wheel surface of the reel and after the pull cord is wound onto a coil on the inner radial side, the rebound action of the rebound device switches the pull cord reversely, allowing a new layer of winding coil to be wound reversely and orderly, so that the coil can be wound orderly in layers.

A winding mechanism adapted for window blinds includes a shaft and at least one spiral groove configured on the shaft. The shaft has a wider first end and a narrower second end, and a diameter of the shaft is gradually reduced from the wider first end to the narrower second end, one end of a pull rope is connected with the shaft, and the other end of the pull rope is connected with slats, the pull rope in turn winds around the spiral groove from the wider first end to the narrower second end, or in turn disengages from the spiral groove from the narrower second end to the wider first end. The force moment of the pull rope is varied with the diameter of the shaft, thereby an effortless and quick operation to pull or lift the window blind is obtained, and no rebound or no falling problem happens.

A cord wrapping mechanism converts linear motion to circular motion for use in coverings for architectural openings. The cord is guided onto a spool.

A motorized shade for covering an architectural opening comprising a roller tube and a shade material comprising an upper end attached to the roller tube and a lower end. The shade material at least partially comprises electrically conductive material and the roller tube comprises an electrically conductive material that creates an electrically conductive path between the conductive material of the shade material and the roller tube. The motorized shade further comprises a capacitive touch sensor electrically connected to the roller tube via at least one electrical contact, and a controller electrically connected to the capacitive touch sensor and adapted to detect a touch of the shade material via the capacitive touch sensor and in response generate a command.

A curtain cord winding device includes a base, a cord winding mechanism rotatably mounted to the base, and a drive mechanism. The cord winding mechanism includes a main reel fitted about a drive shaft of the drive mechanism, and a secondary reel. The main reel includes a first winding segment for winding a cord, and a screw segment screwed to a screw hole of the base. The main reel and the secondary reel are coaxially arranged and fixed in turn. The secondary reel includes a second winding segment, and a first connecting member. An end of the first winding segment away from the screw segment and an end of the second winding segment away from the first connecting member each is provided with a second connecting member. The first connecting member is fixed to the second connecting member in an axial direction.

A cord wrapping mechanism converts linear motion to circular motion for use in coverings for architectural openings. The cord is guided onto a spool.

A winding mechanism adapted for window blinds includes a shaft and at least one spiral groove configured on the shaft. The shaft has a wider first end and a narrower second end, and a diameter of the shaft is gradually reduced from the wider first end to the narrower second end, one end of a pull rope is connected with the shaft, and the other end of the pull rope is connected with slats, the pull rope in turn winds around the spiral groove from the wider first end to the narrower second end, or in turn disengages from the spiral groove from the narrower second end to the wider first end. The force moment of the pull rope is varied with the diameter of the shaft, thereby an effortless and quick operation to pull or lift the window blind is obtained, and no rebound or no falling problem happens.

A control system for a window shade includes a suspension member, a first and a second casing portion, a rotary drum, a torsion spring, a coupling member, a transmission axle, a central gear, a ring and planetary gears. The rotary drum is pivotally connected with the first casing portion, and is rotatable to wind and unwind the suspension member. The torsion spring can bias the rotary drum for winding the suspension member, and has a first and a second end respectively affixed with the second casing portion and a coupling member. The transmission axle is disposed through the torsion spring, and is rotationally coupled with the rotary drum and the central gear. The ring is affixed with the second casing portion and has protruding teeth. The planetary gears are pivotally supported by the coupling member, and are respectively meshed with the central gear and the teeth of the ring.

A pull-rod mechanism includes a drive connector, a pull rod, a lift mechanism, and an actuating mechanism. The pull rod includes a fixed shaft, an unlocking shaft and a lift operating member. When the lift operating member protrudes relative to the unlocking shaft, the lift mechanism drives the actuating mechanism to transmit a torque to the roller for winding up the covering material. When the unlocking shaft protrudes relative to the fixed shaft, the lift mechanism drives a drive shaft of the actuating mechanism to rotate reversely, causing the engagement between the swinging pawls of the actuating mechanism and the drive connector to discontinue. Thereby, the drive connector and the roller rotate freely relative to the drive shaft under a weight of the covering material, unwinding the covering material so that the covering material is extended from the roller.