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.

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 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 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 driving mechanism for curtain cord winding reels includes a driving module, and first and second transition shafts mounted to two sides of the driving module. The driving module includes a base, a power member assembled in the base, and a middle shaft connected to the power member and mounted to two sides of the base. Two ends of the middle shaft extend out of the sides of the base and form a first shaft hole and a first axis. The first and second transition shafts are mounted to the ends of the middle shaft. An end of the first transition shaft connected to the middle shaft forms a second axis. An end of the second transition shaft connected to the middle shaft defines a second shaft hole. Cross sections of the first and second shaft holes, the first and second axes are matched with one another, and are non-circular.

A driving mechanism for curtain cord winding reels includes a driving module, and first and second transition shafts mounted to two sides of the driving module. The driving module includes a base, a power member assembled in the base, and a middle shaft connected to the power member and mounted to two sides of the base. Two ends of the middle shaft extend out of the sides of the base and form a first shaft hole and a first axis. The first and second transition shafts are mounted to the ends of the middle shaft. An end of the first transition shaft connected to the middle shaft forms a second axis. An end of the second transition shaft connected to the middle shaft defines a second shaft hole. Cross sections of the first and second shaft holes, the first and second axes are matched with one another, and are non-circular.

A novel cord retracting-releasing apparatus, including a conical reel set and a drive wheel set, where the conical reel set includes a first cone pulley and a second cone pulley that rotate co-axially, one end of a first pull cord is connected to a curtain retracting-releasing controller, the other end of the first pull cord is fastened to a large-head end of the first cone pulley, one end of a second pull cord is connected to a reel in the drive wheel set, and the other end of the second pull cord is fastened to a small-head end of the second cone pulley. The conical reel set is provided with two cone pulleys toward a same direction and automatically balance the force of the change in the arm of the pull cord on the cone pulley.

A novel cord retracting-releasing apparatus, including a conical reel set and a drive wheel set, where the conical reel set includes a first cone pulley and a second cone pulley that rotate co-axially, one end of a first pull cord is connected to a curtain retracting-releasing controller, the other end of the first pull cord is fastened to a large-head end of the first cone pulley, one end of a second pull cord is connected to a reel in the drive wheel set, and the other end of the second pull cord is fastened to a small-head end of the second cone pulley. The conical reel set is provided with two cone pulleys toward a same direction and automatically balance the force of the change in the arm of the pull cord on the cone pulley.

An embodiment of the present invention provides a curtain drawstring adjustment mechanism mounted at an outside of a drawstring exit of a curtain drawstring mechanism. The curtain drawstring adjustment mechanism includes a base, a slider slidably mounted to the base, and an adjustment member for adjusting a position of the slider in a direction perpendicular to an axial direction of the drawstring exit. The slider correspondingly forms a drawstring limiting portion for hooking the drawstring.

An embodiment of the present invention provides a curtain drawstring adjustment mechanism mounted at an outside of a drawstring exit of a curtain drawstring mechanism. The curtain drawstring adjustment mechanism includes a base, a slider slidably mounted to the base, and an adjustment member for adjusting a position of the slider in a direction perpendicular to an axial direction of the drawstring exit. The slider correspondingly forms a drawstring limiting portion for hooking the drawstring.