Disclosed is a double-drum type curtain drum module, comprising a shell base having two compartments, a first guide wheel, a second guide wheel, an auxiliary cord rotator installed in a first compartment, and two cord drums installed in a second compartment. At least two reinforcing bars in parallel are formed in the first compartment. A plurality of first wheel-connecting grooves are formed on the reinforcing bars for installing the first guide wheel. The second compartment has a plurality of second wheel-connecting grooves formed on a bottom surface of the shell base for installing the second guide wheel. A connecting channel is formed between the reinforcing bars and exposed from the bottom surface of the shell base. The connecting channel extends into the second compartment for coupling the first wheel-connecting grooves and the second wheel-connecting grooves. A control cord reset opening is formed from the first guide wheel to a first end of the connecting channel to align between the curtain auxiliary cord access holes. A control cord transferred opening is formed from the second guide wheel to a second end of the connecting channel. Accordingly, what is solved is the rubbing issue of conventional control cord against the topmost curtain sunshade blade caused by conventional control cord being oblique to the curtain auxiliary cords adjacent to the control cord access holes.

A window blind includes a housing, a slat assembly, a slat angle adjusting device, and a first cord. The slat assembly is provided below the housing, and has multiple slats and a bottom end portion. The slat angle adjusting device includes a rotating shaft assembly provided in the housing, and a ladder assembly which includes at least two ladders connected to the rotating shaft assembly for turning the slats. The first cord passes on a front or a rear side of the slats, and connects the rotating shaft assembly and the bottom end portion. Throughout the duration of the rotation of the rotating shaft assembly, the first cord and a warp, which belongs to the ladder assembly and on the same side as the first cord, are both reeled into or out of the housing concurrently, and the slats and the bottom end portion are all rotated concurrently as well.

A window blind includes a housing, a slat assembly, a slat angle adjusting device, and a first cord. The slat assembly is provided below the housing, and has multiple slats and a bottom end portion. The slat angle adjusting device includes a rotating shaft assembly provided in the housing, and a ladder assembly which includes at least two ladders connected to the rotating shaft assembly for turning the slats. The first cord passes on a front or a rear side of the slats, and connects the rotating shaft assembly and the bottom end portion. Throughout the duration of the rotation of the rotating shaft assembly, the first cord and a warp, which belongs to the ladder assembly and on the same side as the first cord, are both reeled into or out of the housing concurrently, and the slats and the bottom end portion are all rotated concurrently as well.

An actuating system for a window shade includes an axle coupling part rotatable for raising and lowering a movable rail of the window shade, a braking part and a brake coupling part connected with each other, the braking part being adapted to apply a braking force on the brake coupling part for preventing rotation of the brake coupling part, a lift actuating module including a spool connected with an operating part, the spool being rotatable in a winding direction to wind the operating part and in an unwinding direction to unwind the operating part, and a clutching mechanism including two clutching parts movable relative to the brake coupling part and the spool to selectively couple the axle coupling part to either one of the spool and the brake coupling part.

An actuating system for a window shade includes an axle coupling part rotatable for raising and lowering a movable rail of the window shade, a braking part and a brake coupling part connected with each other, the braking part being adapted to apply a braking force on the brake coupling part for preventing rotation of the brake coupling part, a lift actuating module including a spool connected with an operating part, the spool being rotatable in a winding direction to wind the operating part and in an unwinding direction to unwind the operating part, and a clutching mechanism including two clutching parts movable relative to the brake coupling part and the spool to selectively couple the axle coupling part to either one of the spool and the brake coupling part.

A damping device of a window covering is provided, including a headrail, a covering material, and a driving device, wherein the driving device is located in the headrail to raise and extend the covering material. The damping device is provided in the headrail, and includes a metal member and a magnetic member, wherein at least a magnetic pole of the magnetic member faces the metal member. The metal member is located within a magnetic field of the magnetic member. Either one or both the metal member and the magnetic member is drivable by the driving device to make the metal member and the magnetic member move relative to each other. Whereby, the damping device is able to provide a desired damping effect at different temperature or after a long period use, such that the rotation of the metal member and the movement of the covering material are slowed down.

A damping device of a window covering is provided, including a headrail, a covering material, and a driving device, wherein the driving device is located in the headrail to raise and extend the covering material. The damping device is provided in the headrail, and includes a metal member and a magnetic member, wherein at least a magnetic pole of the magnetic member faces the metal member. The metal member is located within a magnetic field of the magnetic member. Either one or both the metal member and the magnetic member is drivable by the driving device to make the metal member and the magnetic member move relative to each other. Whereby, the damping device is able to provide a desired damping effect at different temperature or after a long period use, such that the rotation of the metal member and the movement of the covering material are slowed down.

A window covering includes a first cord extending along a drive pulley of a first ladder control mechanism such that motion of the lift cord along the drive pulley during retraction of slats towards a first rail drives rotation of the drive pulley in a first rotational direction to rotate a ladder pulley for tilting of the slats from an open position to a closed position and motion of the lift cord along the drive pulley during extension of the slats drives rotation of the drive pulley in a second rotational direction to rotate the ladder pulley for tilting of the slats from the closed position to the open position. The ladder may be composed of cord or tape. Each ladder may include a front rail, a rear rail, and rungs that extend between the front and rear rails for supporting the slats.

A window covering includes a first cord extending along a drive pulley of a first ladder control mechanism such that motion of the lift cord along the drive pulley during retraction of slats towards a first rail drives rotation of the drive pulley in a first rotational direction to rotate a ladder pulley for tilting of the slats from an open position to a closed position and motion of the lift cord along the drive pulley during extension of the slats drives rotation of the drive pulley in a second rotational direction to rotate the ladder pulley for tilting of the slats from the closed position to the open position. The ladder may be composed of cord or tape. Each ladder may include a front rail, a rear rail, and rungs that extend between the front and rear rails for supporting the slats.

A window covering includes a positional adjustment mechanism connected to a first rail that includes a spring motor unit, a first lift cord pulley connected to the spring motor unit, a first lift cord collection mechanism having a first roller positioned in the first rail, and a first lift cord that extends from the first lift cord pulley through window covering material such that a portion of the first lift cord passes along the first roller. The first roller is configured so that it only rotates a pre-selected number of revolutions when the window covering material is moved from the extended position to the retracted such that the first roller no longer rotates in the second rotational direction as the window covering material is moved from an extended position to a retracted position after having rotated the pre-selected number of revolutions in the second rotational direction.