Abstract: A motorized window blind includes a top rail, a bottom rail, a plurality of slats assembled between the top rail and the bottom rail, and a control device received in the bottom rail so as to control movement of the slats. The control device includes a transmission unit, a motor, a first cord, a second cord and a power supply. The power supply provides electric power to the motor which is connected to the transmission unit. The first and second cords are respectively connected to the transmission unit, and extend through the slats, and are connected to the top rail. The transmission unit is driven by the motor to lift and lower the slats. The control device includes a detection unit and an angle detection member. The slats are lowered when the detection unit detects the power supply is low. The angle detection member angularly controls the salts status.

Abstract: A scrolling mechanism for a window shade is received in a tube and includes a housing, a wheel, a driving gear, a bevel gear unit, a first scrolling unit and a second scrolling unit. Two springs are respectively connected to the first scrolling unit and the second scrolling unit. The driving gear drives the first scrolling unit, the first scrolling unit drives the second scrolling unit. The torque generated by the scrolling mechanism balances the torque that is created by operation to the bottom rail of the shade so as to control the position of the shade.

Abstract: A window shade adjustment device includes a top rail having two covers on two ends thereof, a housing located between the two covers and having a scrolling part located there. A shade is connected to the top rail and lifted or lowered along with rotation of the housing. Two end caps are respectively engaged with the two ends of the housing. Each end cap includes a tubular portion and a flange which extends radially therefrom. The flanges each are a ring-shaped part, and the thick of the flange is reduced from a center of the flange toward the periphery of the flange so as to form a ramp face that faces the housing. Multiple protrusions protrude axially from the ramp face of each of the flanges. When the shade moves upward and tilt, the shade moves along the ramp face and the protrusions which guide the shade not to tilt.

Abstract: An electric curtain includes an upper beam, two curtain ropes, a curtain body and a lower beam. The upper beam includes a rotating shaft, a pivotal member, two rope winders, a controller and a wireless control unit installed inside the controller. The wireless control unit has the technical feature of receiving and matching with a wireless transmission communication protocol originated from the external, thereby allowing the electric curtain to achieve the effect of establishing the most optimal electrical conduction and wireless communication transmission between the two based on the external wireless transmission communication protocol selected and matched.

Abstract: A window curtain includes a rotary tube located in the top rail, and a curtain is connected between the top rail and the bottom rail. A scrolling device is located in the tube and includes a torsion spring mounted to a fixed shaft. A sleeve is connected to the fixed shaft. An adjustment unit is connected to the fixed shaft. The torsion spring is located between the sleeve and the adjustment unit. The adjustment unit includes a housing, a tubular part and a resilient member. The first end of the torsion spring is fixed to the tubular part. The torsion spring is compressed or released by rotating the adjustment unit. The tubular part includes ratchets which are engaged with a pawl in the housing to maintain the tubular part and the torsion spring from rotating reversely.

Abstract: A control rope guide device for a window curtain assembly includes a bottom part and a top part. The top part is connected to the top of the bottom part. The control rope guide device is cooperated with the window curtain assembly to separate two control ropes apart from each other so as to smoothly expand or lift the curtain.

Abstract: A method for controlling curtain position of a curtain assembly includes a motor and a control unit. The motor includes a detection unit for detecting the working current of the motor. When the curtain moves upward and stops, the detection unit detects the working current increases. The detection unit sends a signal to a processor of the control unit to judge that the curtain reaches the upper-most position. Then the control unit stops the motor and demands the motor to operate reversely a range to lower the curtain slightly. The curtain that is lowered by operating the motor reversely is defined as at a limited position. When the curtain is lowered by the motor, the lower-most position of the curtain is defined by a pre-set number of revolutions of the motor. The pre-set number of revolutions of the motor is set by the control unit.

Abstract: A method for stopping motor operation of an electric window curtain which includes a motor, a scrolling unit being driven by the motor, and a controlling member that controls operation of the motor to activate the scrolling unit to operate ropes to move a curtain. The method includes a detector connected to the motor to detect a load current of the motor. When the curtain moves downward and is interfered to stop, the load current for the motor reduces to close to a non-load current, the detector detects the non-load current of the motor, and the controlling member demands the motor to stop to prevent the ropes from being tied.

Abstract: A scrolling unit for electric blinds includes a top box. An electric motor and a scrolling unit are located in the top box. The electric motor includes a shaft, a plate extends axially from the shaft. The scrolling unit includes a rotary part, and the plate is inserted into a slit defined axially in the rotary part. Two ropes are spirally wrapped to the rotary part. Multiple frames are located in the top box and separate the ropes apart. The diameter of the shaft of the electric motor is different from the diameter of the rotary part. The ropes are spirally wrapped to the rotary part and do not tangle with each other.

Abstract: A scrolling system for a window curtain includes a transmission device connected between a shaft to which the curtain is wrapped, and a fixed frame fixed. The transmission device includes a housing in which a first transmission unit and a second transmission unit are accommodated. The first transmission unit includes a first bevel gear which is engaged with a second bevel gear of the second transmission unit. The shaft is connected to the second transmission unit. The first transmission unit includes a loop which is located beyond the housing. A driving rod is hooked to the loop and drives the first bevel gear which drives the second bevel gear so that the second transmission unit is rotated, such that the shaft is rotated to operate the curtain up and down.

Abstract: A window curtain includes a rotary tube located in the top rail, and a curtain is connected between the top rail and the bottom rail. A scrolling device is located in the tube and includes a torsion spring mounted to a fixed shaft. A sleeve is connected to the fixed shaft. An adjustment unit is connected to the fixed shaft. The torsion spring is located between the sleeve and the adjustment unit. The adjustment unit includes a housing, a tubular part and a resilient member. The first end of the torsion spring is fixed to the tubular part. The torsion spring is compressed or released by rotating the adjustment unit. The tubular part includes ratchets which are engaged with a pawl in the housing to maintain the tubular part and the torsion spring from rotating reversely.

Abstract: A window curtain includes a top rail, a bottom rail and a curtain between the top and bottom rails. A transmission unit and a scrolling unit are received in the bottom rail. Transmission unit includes a control member, a motor, and a shaft connected to the motor. The scrolling unit includes a case in which a passive part, a first prat and a second part are accommodated. The shaft of the motor drives the scrolling unit. A first rope is connected to the first part. A second rope is connected to the second part. The first and second ropes pass through the curtain and are connected to the top rail via the first and second transition members. The transmission unit and the scrolling unit are received in the bottom rail to reduce the weight of the top rail, and are easily maintained.

Abstract: A motorized window blind includes a top rail, a bottom rail, a plurality of slats assembled between the top rail and the bottom rail, and a driving device received in the bottom rail. The driving device includes a transmission unit, a motor, a first cord and a second cord. A first end of each of the first and second cords is connected to the transmission unit, and a second end of each of the first and second cords extends through the slats and is connected to the top rail. The motor is connected to and drives the transmission unit to lift and lower the slats. The driving device received in the bottom rail is easily maintained. The top rail does not occupy too much space and is easily to be installed.

Abstract: A motorized window blind includes a top rail, a bottom rail, a plurality of slats assembled between the top rail and the bottom rail, and a control device received in the bottom rail so as to control movement of the slats. The control device includes a transmission unit, a motor, a first cord, a second cord and a power supply. The power supply provides electric power to the motor which is connected to the transmission unit. The first and second cords are respectively connected to the transmission unit, and extend through the slats, and are connected to the top rail. The transmission unit is driven by the motor to lift and lower the slats. The control device includes a detection unit and an angle detection member. The slats are lowered when the detection unit detects the power supply is low. The angle detection member angularly controls the salts status.

Abstract: A securing device includes an attachment plate and a holder. The attachment plate includes a first face attached to a wall or ceiling, and at least one bolt protrudes from the second face of the attachment plate. The holder includes a first part and a second part, wherein the first part is connected to the at least one bolt which is connected with a nut. The second part includes a first arm and a second arm. The first and second arms hold the curtain top rail. The wall of ceiling is not damaged while curtain top rail is held by the holder.

Abstract: A method for manufacturing an operation device for shutters includes a step of forming a ladder a step of forming a receiving element, a cord accommodated in the receiving element, and a step of connecting multiple connecting elements to the ladder and the receiving element. The operation device for shutters includes a ladder, a receiving element accommodating a cord therein, and the connecting elements connected to the ladder and the receiving element.

Abstract: A window blind includes: a headrail; a blind body and a cord reel, both mounted on the bottom wall of the headrail; two lift cords each having one end fixedly provided at the cord reel and the opposite end inserted through the headrail and the blind body and then fixed to the lower end of the blind body; and a weight and a bottom rail, both provided at the lower end of the blind body. The weight and a slat of the blind body are mounted into the bottom rail through either of the lengthwise ends of the bottom rail and are thus received in the bottom rail, with the junction between the slat and the other slats exposed through a mounting aperture of the bottom rail. The bottom rail can be mounted as needed to enable stable expansion and retraction of the window blind.

Abstract: Provided is a cord-penetrating component for use with a window shade having a top rail, a reeling unit and a cord. A bottom wall of the top rail has a through-hole penetrable by the cord. The reeling unit is disposed in the top rail and has a top plate and a bottom plate. A reeling wheel for reeling in the cord is disposed between the top and bottom plates. The cord-penetrating component is disposed on bottom wall of the top rail and protrudes from top side of the bottom wall. Ratio of vertical distance between bottom side of the top plate of the reeling unit and top side of the bottom plate of the reeling unit to vertical distance between top side of the cord-penetrating component and top side of the bottom wall of the top rail is 2?5:1. A window shade using the cord-penetrating component is further provided.

Abstract: The blind includes an upper beam, a rope winder and a lifting rope. The bottom wall of the upper beam includes a through hole for the lifting rope to penetrate therethrough. The rope winder is arranged inside the upper beam and includes a top plate and a bottom plate. A winding wheel for winding the lifting rope is arranged between the top and bottom plates. The stringing apparatus of the present invention is arranged on the bottom wall of the upper beam and protrudes out of the top surface of the bottom wall. The relationship between a vertical distance from the bottom surface of the top plate of the rope winder to the top surface of the rope winder and a distance from the top surface of the stringing apparatus to the top surface of the bottom wall of the upper beam satisfies the relation of 2-5:1.

Abstract: A blind capable of stepless positioning includes a control unit which controls the positioning of a shade, is disposed in a roller, and has a fixed sleeve, a spindle, a movable sleeve and a pre-torque spring. The fixed sleeve is fixedly disposed at a roller holder and fitted around one end of the spindle, whereas the movable sleeve is fixedly disposed at the roller and fitted around the other end of the spindle; hence, the movable sleeve rotates together with the roller. The pre-torque spring is fitted around the spindle and has two ends connected to the fixed sleeve and the movable sleeve, respectively, such that the pre-torque spring operates in conjunction with the movable sleeve. While the shade is being rolled up and rolled down, a predetermined torque level of the pre-torque spring matches the length of the shade to therefore brake the shade at any height.