TWM656122U - Curtain synchronous control cord retracting device - Google Patents

Abstract

A curtain synchronously controlled rope retracting device comprises: a first driving member, a second driving member, two one-way joint sets, a first reel, a second reel and a synchronous controller, wherein the first and second driving members are both further provided with a one-way joint set, and the first and second reels are then connected and driven by the one-way joint set, so that the curtain structure is synchronously controlled. When the first and second driving members pull the top and bottom rods to move up and down, not only can the synchronous controller achieve synchronous rotation and blocking effects, but the one-way joint assembly can also timely form an idling state to have a foolproof effect, thereby avoiding the concern that the first and second driving members are continuously pulled and cause damage to the synchronous controller, thereby improving practicality and durability.

Description

Curtain synchronous control rope retracting device

This invention is about a curtain retracting device, especially a pull rope retracting device used for synchronous control of curtains that can be adjusted and raised in two directions.

Generally, windows in homes or workplaces are equipped with curtains, which can not only prevent light from penetrating into the room through the window, but also prevent others from peeping from outside. It is known that curtains are usually controlled by a pull rope to achieve the shielding effect. However, at dusk, sunlight only enters the room from the bottom of the window at a low angle. If the curtain is lowered to the lowest point, the entire window will be blocked, causing the room to be dark and poorly ventilated. In view of this, some industry insiders have developed a two-way opening and closing curtain to cope with this problem. In addition to being able to be folded and unfolded at the bottom of the curtain cloth, the top of the curtain cloth can also be lowered to fit with the bottom of the curtain cloth or raised to fit with the fixed curtain rod. In this way, the overall upper and lower positions of the curtain cloth can be controlled to be positioned at the preset positions, thereby flexibly shielding sunlight at different angles without blocking the flow of air and outdoor natural light. Although this improved curtain can solve the shortcomings of the telescopic curtain, in order to independently control the up and down lifting of the bottom or top of the curtain cloth, the linkage mechanism used still has the defects of mutual interference and unsmooth control action, so it is still necessary to develop and improve it.

In view of this, the creator has been engaged in the manufacturing, development and design of related products for many years. Aiming at the above goals, after careful design and careful evaluation, he finally obtained this creation which is truly practical.

The technical problem that the present invention aims to solve is to provide a synchronously controlled rope retracting device for curtains, which is mainly used for a curtain structure capable of bidirectionally adjusting the lifting and lowering of the curtains. The device comprises: a first driving member, a second driving member, two one-way joint sets, a first reel, a second reel and a synchronous controller. The first driving member and the second driving member respectively drive a first rotating shaft and a second rotating shaft to rotate. The first and second driving members both have a driving spindle. The front end of the driving spindle has a non-circular connecting hole. The first driving member is a first rotating shaft, a second rotating shaft is a second rotating shaft, and a first rotating shaft is a second rotating shaft. The first driving member is a first rotating shaft, a second rotating shaft is a second rotating shaft, and a second ... The first and second rotating shafts are respectively connected and penetrated by the first and second winding devices to form a linkage. The synchronous controller has a first screw and a second screw that are screwed along a base body. The first screw is connected and driven by the first rotating shaft, and the second screw is connected and driven by the second rotating shaft. When the ends of the first and second screws are close to each other, they are mutually matched and linked. The characteristic is that the front ends of the first and second driving members are both equipped with a one-way joint group, and the first and second rotating shafts are connected and linked through the one-way joint group, wherein the one-way joint group has a passive ring, a torsion spring, a driven member, and a rotating member. The invention relates to a housing and an outer housing, wherein the passive ring is rotatably sleeved on the outside of the driving spindle, and at least three detent claws are equidistantly provided on the passive ring, the torsion spring is tightly ringed on the outside of the driving spindle, and both ends of the torsion spring are bent upward to have two detent parts, and then the detent claws are pushed and driven by the detent parts, and one end of the driving member has a clutch convex part, and the outer periphery of the clutch convex part is equidistantly provided with a plurality of ratchets and tooth grooves, and the other end of the driving member has a non-cylindrical coupling convex column that is matched and connected with the connecting hole, and the rotating housing covers the passive ring, the torsion spring and the detent part. , and is connected and coupled with the passive ring. The inner wall of the rotating housing forms a clutch recess, and the outer periphery of the clutch recess is provided with a plurality of idle grooves and a plurality of steel balls that can be placed in the idle grooves, and cooperates with the clutch protrusion of the driving member to have a clutched dynamic state. The rotating housing is provided with a protruding column at the front end, and the end surface of the protruding column is further provided with a non-circular hole-shaped through-hole for the first and second rotating shafts to connect. The outer shell covers the rotating housing, the driving member, the torsion spring and the passive ring, and the front end surface of the outer shell is provided with a through-hole for the protruding column to pass through, and then respectively combined and fixed with the first and second driving members.

Preferably, a snap-fastening protrusion is provided at the center of the clutch protrusion of the driving member, and a through hole is provided at the center of the clutch recess of the rotating housing. The through hole is snap-fastened through the snap-fastening protrusion to further restrict the driving member to be rotatable in the rotating housing.

Preferably, the first and second driving members are provided with a plurality of buckle grooves on their peripheries, and the outer shell is provided with a plurality of spring buckle plates that are buckled and coupled with the buckle grooves.

Compared with the effect of the prior art: the first and second driving members of the invention are both further provided with a one-way joint set, and then the first and second rotating shafts are connected through the one-way joint set, so that when the curtain structure is pulled by the first and second driving members to lift the top rod and the bottom rod, it can not only have the synchronous rotation and blocking effect through the synchronous controller, but also can form an idling state in time through the one-way joint set to have a foolproof effect, avoiding the concern that the first and second driving members are continuously pulled and cause the synchronous controller to be damaged, so as to achieve the purpose of protecting the first and second driving members and the synchronous controller, which is helpful to improve the durability of the first and second driving members and has improved practicality.

10: First drive member

11: Drive spindle

111:Connection hole

12: Buckle slot

13: First axis

14: Pull the rope

20: Second drive member

21: Drive spindle

211:Connection hole

22: Buckle slot

23: Second axis

24: Pull the rope

30: One-way connector set

31: Passive ring

311: Claw

32: Torsion spring

321: Braking unit

33: Driving parts

331: Clutch convex part

332: Thorns

333: Tooth groove

334: snap-on boss

335: Combined boss

34: Rotating housing

341: Clutch concave part

342: Idle slot

343:Steel Ball

344:Piercing

345: convex column

346: Piercing hole

35: Shell

351: Socket hole

352: snap clip

40: First reel

50: Second reel

60: Synchronous controller

61: Seat

62: First screw

63: Second screw

70: Curtain structure

71: Upper beam

72: Top bar

73: Bottom bar

74: Curtains

75: Rope body

[Figure 1] is a three-dimensional image of this work.

[Figure 2] is a three-dimensional exploded view of the rope reeling device of this creation.

[Figure 3] is an exploded view of the one-way joint set at the front end of the first (second) drive member of this creation.

[Figure 4] is a cross-sectional view of the curtain structure installation of this creation.

[Figure 5] is a partial enlarged cross-sectional view of the window connection structure installation of this creation.

[Figure 6] is a schematic diagram of the first driving member controlling the bottom rod to descend and unfold the curtain.

[Figure 7] is a partial enlarged cross-sectional view of the first driving member of this invention controlling the descent of the bottom rod.

[Figure 8] is a cross-sectional view of the first driving member of this invention controlling the descent of the bottom rod.

[Figure 9] is a schematic diagram of the first driving member of this invention controlling the bottom rod to descend while the driving member is idling in the rotating housing.

[Figure 10] is a cross-sectional view of the bottom rod of this invention dropped to the bottom and the first screw rod abutted against one end of the seat body to form a positioning.

[Figure 11] is a schematic diagram showing the bottom rod of the invention being lowered to the bottom and the first driving member being idle.

[Figure 12] is a partial enlarged cross-sectional view of the second drive member of this invention controlling the descent of the top rod.

[Figure 13] is a cross-sectional view of the second drive member of this invention controlling the descent of the top rod.

[Figure 14] is a schematic diagram of the second driving member of this invention controlling the top rod to descend while the driving member is idling in the rotating housing.

[Figure 15] is a schematic diagram showing that the second driving member of the present invention continuously controls the top rod to descend, and the second screw rod abuts against the second screw rod to form a positioning.

[Figure 16] is a schematic diagram of the second driving member of this invention being continuously pulled to form an idling state.

[Figure 17] is a partial enlarged cross-sectional view of the second driving member of this invention controlling the rise of the top rod.

[Figure 18] is a cross-sectional view of the second drive member of this invention controlling the rise of the top rod.

[Figure 19] is a partial enlarged cross-sectional view of the first driving member of this invention controlling the rise of the bottom rod.

[Figure 20] is a cross-sectional view of the first driving member of this invention controlling the rise of the bottom rod.

[Figure 21] is a schematic diagram of the one-way joint assembly of this invention idling in the second drive member.

[Figure 22] is a schematic diagram of the rotating housing inside the second driving member of this invention idling outside the driving member.

In order to enable the review committee to have a deeper understanding and knowledge of the purpose, features and effects of this creation, please follow the [Simple Diagram Description] for details:

First, please refer to the first, second and third figures, a curtain synchronously controlled rope retracting device, which comprises: a first driving member 10, a second driving member 20, two one-way joint sets 30, at least one first reel 40, at least one second reel 50 and a synchronous controller 60, the first driving member 10 and the second driving member 20 both have a driving spindle 11, 21, the driving spindle The front ends of the first and second driving members 10 and 20 have a non-circular connecting hole 111 and 211, and the outer peripheries of the first and second driving members 10 and 20 are provided with a plurality of buckle grooves 12 and 22. The front ends of the first and second driving members 10 and 20 are both provided with a one-way joint assembly 30, and the one-way joint assembly 30 is used to connect and drive a first rotating shaft 13 and a second rotating shaft 23, respectively. A passive ring 31, a torsion spring 32, a driver 33, a rotating housing 34 and an outer housing 35. The passive ring 31 is rotatably sleeved outside the driving spindle 11, 21, and at least three detent claws 311 are equidistantly provided on the passive ring 31. The torsion spring 32 is tightly arranged outside the driving spindle 11, 21, and both ends of the torsion spring 32 are bent upward to have two detent parts 311. 21, and then the said pawl 311 is pushed and driven by the said pawl 321, and one end of the said driving member 33 has a clutch protrusion 331, and the outer periphery of the clutch protrusion 331 is provided with a plurality of ratchets 332 and tooth grooves 333 at equal intervals, and a snap-fastening protrusion 334 is provided at the center of the clutch protrusion 331, and the other end of the said driving member 33 has a non-cylindrical coupling protrusion 335 which is connected with the said connecting hole 111, 211 is matched and connected, the rotating housing 34 covers the passive ring 31, the torsion spring 32 and the driving member 33, and is connected to the passive ring 31 to form a linkage, the inner wall of the rotating housing 34 forms a clutch recess 341, the outer periphery of the clutch recess 341 is provided with a plurality of idle grooves 342 and a plurality of steel balls 343 that can be placed in the idle grooves 342, and cooperate with the clutch convex of the driving member 33. The part 331 has a disengaged dynamic state, and a through hole 344 is provided at the center of the disengagement recess 341 of the rotating housing 34, and the through hole 344 is passed through the snap-on protrusion 334 for snap-on engagement. A protrusion 345 is provided at the front end of the rotating housing 34, and a non-circular through hole 346 is further provided on the end surface of the protrusion 345 for connection of the first and second rotating shafts 13 and 23. The outer shell 35 covers the rotating housing. The outer shell 35 is provided with a sleeve hole 351 at the front end surface thereof for the protruding column 345 to pass through, so as to further restrict the rotating shell 34 to be rotatable in the outer shell 35, and a plurality of snap plates 352 are provided on the periphery of the outer shell 35 to be snap-fitted with the snap grooves 12 and 22 of the first and second driving members 10 and 20. , 23 respectively penetrate and connect the first and second reels 40, 50 to form a linkage. The synchronous controller 60 has a first screw 62 and a second screw 63 that are screwed along a base 61. The first screw 62 is connected to the first rotating shaft 13 for actuation, and the second screw 63 is connected to the second rotating shaft 23 for actuation. When the ends of the first and second screws 62, 63 are close to each other, they fit together and are linked.

The assembly application of the structure is shown in Figures 2 to 5. The pull rope retracting device is applied to a curtain structure that can adjust the curtain lifting in two directions. The curtain structure 70 includes an upper beam 71, a top rod 72, a bottom rod 73, a curtain sheet 74 between the top rod 72 and the bottom rod 73, and a plurality of control means for controlling the lifting and lowering of the top rod 72 and the bottom rod 73. The first and second driving members 10 and 20 are provided with a one-way joint set 30 at their front ends. The two one-way joint sets 30 have opposite clutch directions. One end of the first and second rotating shafts 13 and 23 is respectively inserted into the through holes 346 of the two one-way joint sets 30 on the rotating housing 34. The first and second winding ropes 40 and 50 are respectively inserted into the first and second winding ropes 40 and 50. The first and second screws 62 and 63 of the synchronous controller 60 are firstly screwed and arranged on the base 61, and the ends of the first and second screws 62 and 63 are fitted against each other, and then the other ends of the first and second shafts 13 and 23 are respectively passed through the first and second screws 62 and 63 of the synchronous controller 60, thereby the two driving parts 1 are connected. 0 and 20 are respectively arranged at the two ends, and are connected to the first and second reels 40 and 50 and the synchronous controller 60 in sequence. Finally, the above structure is placed in the upper beam of the curtain structure 70, and the rope body 75 is reeled in by the first and second reels 40 and 50 to achieve the lifting action of the top rod 72 and the bottom rod 73, so as to complete the installation assembly of the rope reeling device.

The actual use state of the structure is shown in Figures 5 to 9. When the curtain structure 70 is not in use, the bottom rod 73 gathers the curtain sheet 74 upward and under the top rod 72, and the top rod 72 is upward against the bottom of the upper beam 71, so that the curtain structure 70 forms a fully open and light-transmitting state, and the first and second screw rods 62 and 63 of the synchronous controller 60 are close to each other, and the first driving member 10 controls the lifting and lowering of the bottom rod 73, and the second driving member 20 controls the lifting and lowering of the top rod 72. Accordingly, the first driving member 10 is pulled clockwise to move the bottom rod 73 upward. When the pull rope 14 of the first driving member 10 controls the bottom rod 73 to descend to form the unfolded state of the curtain 74, the driving spindle 11 of the first driving member 10 will synchronously drive the torsion spring 32 of the one-way joint assembly 30 and the driving member 33 to rotate. When the torsion spring 32 rotates clockwise with the driving spindle 11, it pushes the detent claw 311 of the passive ring 31 through the detent portion 321, thereby driving the rotating housing 34 to rotate and driving the first winding device 40 to loosen the rope body 75 through the rotation of the first rotating shaft 13, so that the bottom rod 73 can naturally descend to achieve the downward unfolding of the curtain 74. The purpose of shading is to open the driving member 33, and when the driving member 33 moves clockwise, the steel ball 343 is pushed into the idle groove 342 of the clutch recess 341 through the ratchet 332, so that the clutch protrusion 331 and the clutch recess 341 form a disengaged state, so that the driving member 33 can idle in the rotating housing 34; at the same time, the first screw 62 of the synchronous controller 60 will rotate along the seat body 61 as the first rotating shaft 13 rotates and gradually moves away from the second rotating shaft 23; in addition, when the bottom rod 73 is completely lowered, please refer to Figures 10 and 11, the first screw 62 of the synchronous controller 60 will rotate along the seat body 61 as the first rotating shaft 13 rotates and gradually moves away from the second rotating shaft 23. A screw rod 62 will be screwed against one end of the seat body 61 to form a limited state, and at the same time, the first shaft 13 will be restricted from being rotated. At this time, the rotating housing 34 and the passive ring 31 will be unable to rotate along with the first shaft 13, and the detent part 321 of the torsion spring 32 will loosen the driving spindle 11 due to the abutment against the passive ring 31 that cannot rotate, so that when the first driving member 10 continues to pull the rope 14, the driving spindle 11 will still rotate and drive the driving member 33 to idle in the rotating housing 34, so as to avoid continuous pulling of the rope 14 and damage to the parts.

Furthermore, when the pull rope 24 of the second driving member 20 is pulled counterclockwise and the top rod 72 is controlled to descend, as shown in FIGS. 12 to 14, the driving spindle 21 of the second driving member 20 will synchronously drive the torsion spring 32 of the one-way joint assembly 30 and the driving member 33 to rotate. When the torsion spring 32 rotates counterclockwise with the driving spindle 21, it pushes against the driving claw 311 of the passive ring 31 through the driving portion 321, thereby driving the rotating housing 34 to rotate and The second winding device 50 is driven by the second rotating shaft 23 to loosen the rope body 75, so that the top rod 72 can be naturally lowered and the curtain sheet 74 is gathered toward the bottom rod 73. At the same time, the top rod 72 is lowered away from the upper beam 71 to form a light-transmitting effect on the upper half of the curtain. When the driving member 33 is actuated counterclockwise, the steel ball 343 is pushed into the idle groove 342 of the clutch recess 341 through the ratchet 332, so that the clutch protrusion 331 and the clutch recess 341 are disengaged. state, so that the driving member 33 is idle in the rotating housing 34; at the same time, the second screw 63 of the synchronous controller 60 will rotate along the seat body 61 as the second shaft 23 rotates and gradually approaches the first screw 62; moreover, when the top rod 72 descends and the curtain sheet 74 is collected downward above the bottom rod 73, please continue to see from Figures 15 and 16 that the second screw 63 is screwed against the first screw 62 to form a positioning state, and at the same time, the second screw 63 is limited. The shaft 23 can no longer be rotated, and the rotating housing 34 and the passive ring 31 are in an unrotatable state along with the second rotating shaft 23, and the detent portion 321 of the torsion spring 32 is loosened from the driving spindle 11 by abutting against the unrotatable passive ring 31, so that when the second driving member 20 continues to pull the rope 24, the driving spindle 21 will still rotate and drive the driving member 33 to idle in the rotating housing 34, thereby avoiding damage to the part caused by continuously pulling the rope 14.

Furthermore, when the pull rope 24 of the second driving member 20 is pulled to control the top rod 72 to move upward, as shown in Figures 17 and 18, the pull rope 24 pulls the driving spindle 21 clockwise to rotate. At this time, the driving spindle 21 drives the torsion spring 32 and the driving member 33 to rotate clockwise at the same time. Since the driving member 33 guides the steel ball 343 into the tooth groove 333 through the ratchet 332 of the clutch protrusion 331, and also presses the steel ball 343 against the tooth groove 333 and the opening of the idle groove 342, The clutch protrusion 331 and the clutch recess 341 form a bite state, so that the rotating housing 34 can be driven to rotate directly through the driving member 33, thereby linking the second shaft 23 to rotate clockwise and drive the second reel 50 to reel in the rope body 75, so that the top rod 72 can be moved upward and the curtain sheet 74 is unfolded toward the upper beam 71, forming a shading effect on the upper half of the curtain; at the same time, the second screw 63 of the synchronous controller 60 will rotate along the seat body 61 as the second shaft 23 rotates and gradually move away from the first screw 62.

Next, the pull rope 14 of the first driving member 10 is pulled to control the bottom rod 73 to move upward. As shown in FIGS. 19 and 20, the pull rope 14 pulls the driving spindle 11 counterclockwise to rotate. At this time, the driving spindle 11 drives the torsion spring 32 and the driving member 33 to rotate counterclockwise. Since the driving member 33 guides the steel ball 343 into the tooth groove 333 through the ratchet 332 of the clutch protrusion 331, and the steel ball 343 is pressed against the opening between the tooth groove 333 and the idle groove 342, The clutch protrusion 331 and the clutch recess 341 form a bite state, so that the rotating housing 34 can be driven to rotate directly through the driving member 33, thereby linking the first shaft 13 to rotate counterclockwise and drive the first reel 40 to reel in the rope body 75, so that the bottom rod 73 can be moved upward and the curtain sheet 74 is retracted toward the top rod 72 to form a light-transmitting effect of the curtain; at the same time, the first screw 62 of the synchronous controller 60 will rotate along the seat body 61 as the first shaft 13 rotates and gradually approaches the second screw 63.

In addition, when the top rod 72 has not yet completely abutted against the bottom of the upper beam 71, and the pull rope 14 of the first driving member 10 is continuously pulled to raise the bottom rod 73 to close the curtain sheet 74, since the bottom rod 73 is simultaneously driven to move the first screw 62 toward the second screw 63 during the process of rising, when the curtain sheet 74 is completely collected between the top rod 72 and the bottom rod 73, the first screw 62 and the second screw 63 are moved. The second screw 63 is fitted against each other (as shown in FIG. 19 ), and when the first driving member 10 winds up the curtain sheet 74, the driving member 33 engages with the rotating housing 34 to form a direct transmission state, so the winding force is relatively large and the second screw 63 can be driven to rotate by the first screw 62 at the same time, thereby synchronously rotating the second shaft 23 and driving the second reel 50 to perform the rope The retraction of the body 75 achieves the effect of synchronously pushing the top rod 72 up, and when the second shaft 23 is synchronously rotated, as shown in Figures 21 and 22, the rotating housing 34 of the second driving member 20 and the passive ring 31 rotate clockwise synchronously with the second shaft 23, and the detent claw 311 of the passive ring 31 pushes the detent claw 311 of the torsion spring 32 in the opposite direction. The torsion spring 32 is loosened and idles outside the driving spindle 11, so that the passive ring 31 and the rotating housing 34 will not drive the driving spindle 21 to rotate when rotating, and the rotating housing 34 is idle outside the driving member 33, which can avoid linking the second driving member 20 to ensure the stability of the structural operation, thereby improving the convenience and practicality of the curtain operation.

The structure of the above-mentioned specific embodiment can obtain the following benefits: the first and second driving members 10 and 20 of the invention are both further provided with a one-way joint set 30, and then the first and second rotating shafts 13 and 23 are connected through the one-way joint set 30, so that when the curtain structure 70 is pulled up and down by the first and second driving members 10 and 20 to pull the top rod 72 and the bottom rod 73, it can not only have the same matching through the synchronous controller 60 In addition to the step rotation and blocking effect, the one-way joint set 30 can also be used to form an idle state in time to have a foolproof effect, avoiding the concern that the first and second driving parts 10 and 20 are continuously pulled and cause damage to the synchronous controller 60, thereby achieving the purpose of protecting the first and second driving parts 10 and 20 and the synchronous controller 60, which helps to improve the durability of the first and second driving parts 10 and 20 and has a practical improvement.

In summary, this creation has indeed achieved a breakthrough structural design, and has improved new content, while also being able to achieve industrial applicability and progress. Moreover, this creation has not been seen in any publication and is also novel, and should comply with the relevant provisions of the Patent Law. Therefore, a new patent application has been filed in accordance with the law, and the Jun Bureau Review Committee is requested to grant legal patent rights, and I am very grateful.

However, the above is only a preferred embodiment of this invention, and it cannot be used to limit the scope of implementation of this invention; that is, all equivalent changes and modifications made within the scope of this new patent application should still fall within the scope of this new patent.

10: First drive member

11: Drive spindle

111:Connection hole

12: Buckle slot

14: Pull the rope

20: Second drive member

21: Drive spindle

211:Connection hole

22: Buckle slot

24: Pull the rope

30: One-way connector set

31: Passive ring

311: Claw

32: Torsion spring

321: Braking unit

33: Driving parts

331: Clutch convex part

332: Thorns

333: Tooth groove

334: snap-on boss

335: Combined boss

34: Rotating housing

341: Clutch concave part

342: Idle slot

343:Steel Ball

344:Piercing

345: convex column

346: Piercing hole

35: Shell

352: snap clip

Claims (3)

A curtain synchronously controlled rope retracting device is mainly used for a curtain structure capable of bidirectionally adjusting the lifting and lowering of the curtain, comprising: a first driving member, a second driving member, two one-way joint sets, a first reel, a second reel and a synchronous controller, wherein the first driving member and the second driving member respectively drive a first rotating shaft and a second rotating shaft to rotate, and the first and second driving members both have a driving spindle, and the front end of the driving spindle has a non-circular hole-shaped connecting hole, and the first and second rotating shafts respectively penetrate and connect the first and second reels to form a The synchronous controller has a first screw and a second screw that are screwed along a base body, the first screw is connected to the first shaft, the second screw is connected to the second shaft, and the ends of the first and second screws are closely connected to each other. The first and second screws are characterized in that the front ends of the first and second driving members are both equipped with a one-way joint set, and the first and second shafts are connected and linked through the one-way joint set, wherein the one-way joint set has a passive ring, a torsion spring, a driven member, a rotating housing and an outer housing, and the passive ring is rotatable. The driven member is movably sleeved outside the driving spindle, and at least three detent claws are equidistantly provided on the passive ring. The torsion spring is tightly ringed outside the driving spindle, and both ends of the torsion spring are bent upward to have two detent parts, and then the detent claws are pushed and driven by the detent parts. One end of the driving member has a clutch protrusion, and the outer periphery of the clutch protrusion is equidistantly provided with a plurality of ratchets and tooth grooves. The other end of the driving member has a non-cylindrical coupling protrusion that is matched and connected with the connecting hole. The rotating housing covers the passive ring, the torsion spring and the detent, and is connected to the passive ring. The inner wall of the rotating housing forms a clutch recess, and the outer periphery of the clutch recess is provided with a plurality of idle grooves and a plurality of steel balls that can be placed in the idle grooves, and cooperates with the clutch protrusion of the driving member to have a clutched dynamic state. A boss is provided at the front end of the rotating housing, and a non-circular hole is provided on the end surface of the boss for connecting the first and second shafts. The outer shell covers the rotating housing, the driving member, the torsion spring and the passive ring, and a sleeve hole is provided on the front end surface of the outer shell for the boss to pass through, and then respectively combined and fixed with the first and second driving members. As described in claim 1, the pull rope retracting device for synchronous control of the curtain, wherein a snap-fastening protrusion is provided at the center of the clutch protrusion of the driving member, and a through hole is provided at the center of the clutch recess of the rotating housing, and the through hole is buckled through the snap-fastening protrusion to further restrict the driving member to be rotatable in the rotating housing. As described in claim 1, the pull rope retracting device for synchronous control of the curtain, wherein the first and second driving members are provided with a plurality of buckle grooves on the periphery, and the outer shell is provided with a plurality of spring buckle plates that are buckled and combined with the buckle grooves.

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