Pull rope linkage control device and pull curtain

Abstract

The utility model provides a pull rope linkage control device and a pull curtain, and the pull rope linkage control device comprises a mounting base; the first rope winding part and the second rope winding part are rotationally assembled on the mounting base, the first rope winding part and the second rope winding part are in mutual meshing transmission and are respectively used for winding a pull rope, and a spring piece used for forming elastic restoring force is arranged between the first rope winding part and the second rope winding part; the damping buffer is in transmission connection with the first rope winding part or the second rope winding part and is used for providing damping force to buffer the elastic restoring force; and the one-way stop mechanism is in transmission connection with the first rope winding part or the second rope winding part. The curtain cloth can be stopped after being pulled to any position through the one-way stop mechanism, so that different use requirements are met, impact force generated by springback can be reduced through the damping buffer, and noise and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of curtain pulling, in particular to a pull-cord linkage control device and a curtain pulling. Background Art

[0002] Cordless curtains are one of the commonly used devices for daily sunshade and light blocking and are widely used. There are generally two types of cordless curtains on the market. One is the push-pull type, which means that the curtain is adjusted by manually pulling down or pushing up, and can be stopped at any position, but it requires external force and does not have an automatic reset function. The other is the spring type, which automatically resets through the rebound of the coil spring. However, during the curtain retraction process, the bottom rod and the top box of the curtain will impact and produce noise, and after pulling down, the curtain blocking position needs to be adjusted again. It can only be reset for a distance and then pulled down again. The operation is inconvenient and may get stuck. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a pull-cord linkage control device and a pull curtain, which have the advantages of being able to stop at any position and being able to dampen and buffer the rebound force.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides the following technical solutions:

[0005] The present invention discloses an embodiment, in a first aspect, a pull-cord linkage control device, comprising:

[0006] Install the base;

[0007] A first rope winding portion and a second rope winding portion rotatably mounted on the mounting base, the first rope winding portion and the second rope winding portion meshing with each other for transmission and respectively used for winding up the draw rope, and a spring member for generating an elastic restoring force is provided between the first rope winding portion and the second rope winding portion;

[0008] a damping buffer transmission-connected to the first rope winding portion or the second rope winding portion, for providing a damping force to buffer the elastic restoring force; and

[0009] A one-way stop mechanism is connected to the first rope winding part or the second rope winding part, and the one-way stop mechanism includes a limiting ball and a labyrinth raceway that cooperate with each other. The limiting ball can engage with the labyrinth raceway when the first rope winding part or the second rope winding part is instantly reversed to realize one-way rotation of the one-way stop mechanism, and can be disengaged from the engaging state to realize free rotation of the one-way stop mechanism.

[0010] To implement the above technical solution, when in use, the drawstrings wound up by the first and second drawstring parts are respectively connected to the two sides of the curtain. When the curtain is pulled down, the drawstrings are unwound, and the first and second drawstring parts are driven to rotate relative to each other during the unwinding process. Since the first and second drawstring parts are engaged in transmission, the two parts rotate synchronously, and the spring part is pulled during the rotation process to generate an elastic restoring force. When the curtain is loosened, the first and second drawstring parts lose the downward pulling force, and thus rotate in the opposite direction under the action of the elastic restoring force. When the first and second drawstring parts are instantly reversed, the limit ball will engage with the labyrinth roller, so that the curtain stops. This allows the curtain to be pulled to any position and then stopped, and the curtain position can be changed by continuing to pull it down, and then stopped again, thus meeting different usage requirements; and when the curtain needs to be retracted, the curtain is pulled and then released, so that the limit ball will be out of the engaged state and roll freely in the maze raceway, and at this time the first and second rope winding parts can be reversed under the action of the elastic restoring force to retract the pull rope, thereby realizing automatic winding of the curtain, and in the process of winding, the damping buffer will be driven to transmit synchronously, so that the elastic restoring force can be buffered under the action of the damping force, slowing down the rotation of the first and second rope winding parts, thereby reducing the impact force caused by the rebound, reducing noise and safety hazards.

[0011] In one embodiment of the present invention, the one-way stop mechanism includes:

[0012] a sleeve connected to the first rope winding part or the second rope winding part in a transmission manner, wherein the sleeve is provided with a ball groove;

[0013] A roller rotatably mounted in the sleeve and adapted to the sleeve, the roller being provided with a labyrinth roller track, and the labyrinth roller track being provided with a limit slot; and

[0014] The limiting ball can roll in the ball groove and the labyrinth raceway and drive the roller to rotate in a linked manner. The limiting ball can be embedded in the limiting slot to limit the instantaneous reversal of the sleeve to achieve unidirectional rotation, and can be disengaged from the limiting slot to allow the sleeve to rotate freely.

[0015] To implement the above technical solution, when pulling down, the sleeve rotates synchronously under the power of the first rope winding part or the second rope winding part. At this time, the limit ball can move in the maze raceway and drive the roller to rotate. When the pull-down stops suddenly, the limit ball will fall into the limit slot and form a clamping state, thereby achieving stopping; when continuing to pull down, because the limit ball remains in a stuck state, it can be pulled to any position and then stopped to achieve stopping. At this time, a certain pulling force needs to be applied to continue pulling down; and if resetting is required, quickly pull down and then release, the limit ball will disengage from the limit slot, and can now rotate freely without affecting the return rotation.

[0016] In one embodiment of the present invention, a fixed shaft coaxially arranged with the sleeve is fixed on the mounting base, and the roller is rotatably assembled on the fixed shaft.

[0017] The above technical solution is implemented to facilitate installation of the roller.

[0018] In one embodiment of the present invention, the first rope winding portion includes:

[0019] a first gear rotatably mounted on the mounting base; and

[0020] A first rope loop is fixed to the first gear and is used for winding up the first side pull rope.

[0021] In one embodiment of the present invention, the second rope winding portion includes:

[0022] a second gear rotatably mounted on the mounting base and meshing with the first gear; and

[0023] A second rope loop is fixed to the second gear and is used for winding up the second side pull rope.

[0024] To implement the above technical solution, the pull rope is reeled in by the first rope winding loop and the second rope winding loop respectively, and the first gear and the second gear are engaged in transmission, so that the first rope winding loop and the second rope winding loop rotate synchronously, thereby realizing synchronous reeling or unreeling of the pull rope.

[0025] In one embodiment of the present invention, the spring member is a scroll spring, which is coaxially arranged with the second gear, and has a first end fixed relative to the first gear and a second end fixed relative to the mounting base.

[0026] In one embodiment of the present invention, a clamping sleeve is provided on the first rope winding sleeve, and the first end of the spiral spring is clamped and fixed to the clamping sleeve; a connecting shaft for rotatably installing the second gear is provided on the mounting base, the spiral spring is sleeved on the connecting shaft, and the second end of the spiral spring is fixed to the connecting shaft.

[0027] To implement the above technical solution, when the first rope winding portion and the second rope winding portion rotate in the forward direction, the spiral spring begins to release and winds around the clamping sleeve to generate an elastic restoring force.

[0028] In one embodiment of the present invention, a third gear rotatably connected to the mounting base is provided at the bottom of the sleeve, and the third gear is meshed with the first gear or the second gear for transmission.

[0029] By implementing the above technical solution, the sleeve and the first rope winding part or the second rope winding part can be rotated synchronously.

[0030] In one embodiment of the present invention, the damping buffer includes:

[0031] a fourth gear rotatably mounted on the first gear or the second gear;

[0032] a damping shaft fixed to the fourth gear; and

[0033] A damping sleeve is fixed relatively to the mounting base, wherein damping oil is filled in the damping sleeve, and the damping shaft passes through the damping sleeve and is sealed with the damping sleeve.

[0034] To implement the above technical solution, when the first rope winding part or the second rope winding part rotates, it will synchronously drive the fourth gear to rotate. At this time, due to the action of the damping oil, a damping force will be generated on the damping shaft, thereby limiting the rapid rotation of the fourth gear, and then buffering the elastic restoring force of the spring part.

[0035] In one embodiment of the present invention, a limiting torsion spring is further provided at the upper end of the roller. The limiting torsion spring is sleeved on the fixed shaft and loosely fits with the fixed shaft. One end of the limiting torsion spring is fixed to the roller and the other end is free. When the roller reverses, the limiting torsion spring has an elastic deformation tendency to limit the rotation of the roller.

[0036] To implement the above technical solution, when the limiting ball is in a clamped and continuously external force state, when the sleeve rotates forward, the limiting torsion spring will rotate forward synchronously with the roller. At this time, the limiting torsion spring has no deformation tendency, and therefore does not affect the forward rotation of the roller. Since one end of the limiting torsion spring is free and closely matched with the fixed shaft, the limiting torsion spring has an elastic deformation tendency, so that the roller cannot reverse and can only rotate forward, so that the ball will not encounter any obstacles in the maze raceway during reset, thereby improving the use stability and preventing reset jamming.

[0037] In one embodiment of the present invention, the mounting base is further connected to a top cover, which covers the mounting base; and the top cover is provided with a positioning block for limiting the damping sleeve.

[0038] By implementing the above technical solution, the top cover can be used to protect the various components, and the positioning block can be used to limit and fix the damping sleeve.

[0039] The present utility model discloses an embodiment, and a second aspect provides a curtain, comprising the pull-cord linkage control device as described in the first aspect.

[0040] As mentioned above, the complete utility model name of the present utility model has the following beneficial effects:

[0041] The embodiment of the utility model adopts a pull-cord linkage control device and a curtain pulling device. When in use, the pull cords wound up by the first rope part and the second rope part are respectively connected to the two sides of the curtain. When the curtain is pulled down, the pull cord is unwound, and the first rope part and the second rope part are driven to rotate relative to each other during the unwinding process. Since the first rope part and the second rope part are engaged in transmission, the two will rotate synchronously, and the spring part will be pulled during the rotation process to generate an elastic restoring force; when the curtain is loosened, the first rope part and the second rope part lose the downward pulling force, so they will rotate in the opposite direction under the action of the elastic restoring force, and when the first rope part and the second rope part are instantly reversed, the limit ball will form a locking state with the maze roller. The curtain is stopped, so that the curtain can be stopped after being pulled to any position, and the curtain position can be changed after continuing to pull it down and then stopped, thereby meeting different usage needs; and when the curtain needs to be retracted, the curtain is pulled and then released, so that the limit ball will be out of the engaged state and roll freely in the maze raceway, and the first and second rope winding parts can be reversed and the pull ropes can be recovered under the action of the elastic restoring force, thereby realizing automatic winding of the curtain, and in the process of winding, the damping buffer will be driven to transmit synchronously, so that the elastic restoring force can be buffered under the action of the damping force, slowing down the rotation of the first and second rope winding parts, thereby reducing the impact force caused by the rebound, reducing noise and safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Shown is a structural schematic diagram of a pull-cord linkage control device in an embodiment of the present utility model.

[0043] Figure 2 It shows a schematic structural diagram of the pull-cord linkage control device in an embodiment of the present invention without the top cover.

[0044] Figure 3 Shown is a cross-sectional view of a pull-cord linkage control device in an embodiment of the present invention.

[0045] Figure 4 Shown is an exploded schematic diagram of the roller, limiting ball and limiting torsion spring in an embodiment of the present invention.

[0046] Component number description

[0047] 10. Mounting base; 11. Connecting shaft; 20. First rope winding part; 21. First gear; 22. First rope winding sleeve; 23. Clamping sleeve; 30. Second rope winding part; 31. Second gear; 32. Second rope winding sleeve; 40. Spring member; 50. Damping buffer; 51. Fourth gear; 52. Damping shaft; 53. Damping sleeve; 60. One-way stop mechanism; 61. Sleeve; 62. Ball groove; 63. Roller; 64. Labyrinth raceway; 65. Limiting slot; 66. Limiting ball; 67. Fixed shaft; 68. Third gear; 69. Limiting torsion spring; 70. Top cover; 71. Positioning block. DETAILED DESCRIPTION

[0048] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0049] See also Figures 1 to 4 In a first aspect, an embodiment of the present invention provides a rope-pulling linkage control device, comprising: a mounting base 10; a first rope-winding portion 20 and a second rope-winding portion 30 rotatably mounted on the mounting base 10, the first rope-winding portion 20 and the second rope-winding portion 30 being engaged with each other for transmission and respectively used for winding up the rope, and a spring member 40 for forming an elastic restoring force is provided between the first rope-winding portion 20 and the second rope-winding portion 30; a damping buffer 50 transmission-connected to the first rope-winding portion 20 or the second rope-winding portion 30 for providing a damping force to buffer the elastic restoring force; and a one-way stopping mechanism 60 transmission-connected to the first rope-winding portion 20 or the second rope-winding portion 30.

[0050] Among them, the one-way stop mechanism 60 includes a limiting ball 66 and a labyrinth roller 64 that cooperate with each other. The limiting ball 66 can engage with the labyrinth roller 64 when the first rope winding part 20 or the second rope winding part 30 is instantly reversed to realize the one-way rotation of the one-way stop mechanism 60, and can be disengaged from the engaging state to realize the free rotation of the one-way stop mechanism 60.

[0051] Specifically, the first rope winding portion 20 includes: a first gear 21 rotatably assembled on the mounting base 10; and a first rope loop 22 fixed to the first gear 21 for winding up the first side pull rope, the first rope loop 22 and the first gear 21 are integrally formed, and a first rope winding groove is formed between the first rope loop 22 and the first gear 21; the second rope winding portion 30 includes: a second gear 31 rotatably assembled on the mounting base 10 and meshing with the first gear 21; and a second rope loop 32 fixed to the second gear 31 for winding up the second side pull rope, the second rope loop 32 and the second gear 31 are integrally formed, and a second rope winding groove is formed between the second rope loop 32 and the second gear 31. The first side pull rope and the second side pull rope are respectively wound on the first rope loop 22 and the second rope loop 32 in opposite directions. Due to the meshing relationship between the first gear 21 and the second gear 31, the rotation directions of the two are also opposite. The pull ropes are respectively wound through the first rope loop 22 and the second rope loop 32, and the first gear 21 and the second gear 31 are meshed for transmission, so that the first rope loop 22 and the second rope loop 32 rotate synchronously, thereby realizing synchronous winding or unwinding of the pull rope.

[0052] The spring member 40 is preferably a spiral spring, which is coaxially arranged with the second gear 31, and the first end of the spiral spring is relatively fixed to the first gear 21, and the second end is relatively fixed to the mounting base 10; wherein, a clamping sleeve 23 is provided on the first rope sleeve 22, and the clamping sleeve 23 is integrally formed with the first rope sleeve 22, and the first end of the spiral spring is clamped and fixed to the clamping sleeve 23. Specifically, a bayonet is provided on the clamping sleeve 23, and the first end of the spiral spring is clamped into the bayonet and fixed in the bayonet by a buckle or screw connection; a connecting shaft 11 for rotatably mounting the second gear 31 is provided on the mounting base 10, the spiral spring is sleeved on the connecting shaft 11, and the second end of the spiral spring is fixed to the connecting shaft 11, accordingly, a shaft for mounting the first gear 21 can also be provided on the mounting base 10; when the first rope winding part 20 and the second rope winding part 30 rotate forward, the spiral spring begins to release and winds around the clamping sleeve 23 to generate an elastic restoring force.

[0053] The damping buffer 50 includes: a fourth gear 51 rotatably mounted on the first gear 21 or the second gear 31; a damping shaft 52 fixed to the fourth gear 51; and a damping sleeve 53 fixed relative to the mounting base 10. The damping sleeve 53 is filled with damping oil. The damping shaft 52 is inserted into and sealed with the damping sleeve 53. The bottom of the damping sleeve 53 is sealed by a sealing ring. The middle of the sealing ring has a sealing opening for the damping shaft 52 to pass through. To increase the damping force, a connecting sleeve can also be provided on the damping shaft 52 to increase the contact area with the damping oil. When the first rope winding portion 20 or the second rope winding portion 30 rotates, it simultaneously drives the fourth gear 51 to rotate. At this time, the damping oil generates a damping force on the damping shaft 52, thereby limiting the rapid rotation of the fourth gear 51 and buffering the elastic restoring force of the spring member 40.

[0054] Furthermore, a top cover 70 is connected to the mounting base 10, which is locked with the mounting base 10 by bolts and covers the top of the mounting base 10 to protect the various components; and a positioning block 71 for limiting the damping sleeve 53 is provided on the top cover 70, and a positioning opening adapted to the positioning block 71 is provided at the bottom of the damping sleeve 53. The positioning block 71 is rectangular in shape, and the positioning block 71 is embedded in the positioning opening, thereby realizing the limiting fixation of the damping sleeve 53.

[0055] The one-way stopping mechanism 60 specifically includes: a sleeve 61 which is transmission-connected to the first rope winding part 20 or the second rope winding part 30, and a ball groove 62 is provided on the sleeve 61; a roller 63 which is rotatably assembled in the sleeve 61 and adapted to the sleeve 61, and a labyrinth roller 64 is provided on the roller 63, and a limiting groove 65 is provided in the labyrinth roller 64; and a limiting ball 66, which can roll in the ball groove 62 and the labyrinth roller 64 and can drive the roller 63 to rotate in conjunction, and the limiting ball 66 can be embedded in the limiting groove 65 to realize the stopping of the sleeve 61, and can be disengaged from the limiting groove 65 to allow the sleeve 61 to rotate freely.

[0056] The bottom of the sleeve 61 is provided with a third gear 68 rotatably connected to the mounting base 10. The third gear 68 meshes with the first gear 21 or the second gear 31 for transmission, thereby achieving synchronous rotation of the sleeve 61 and the first rope winding portion 20 or the second rope winding portion 30. Preferably, the mounting base 10 is also provided with a mounting notch for receiving the first gear 21, the second gear 31, the third gear 68, and the fourth gear 51. A fixed shaft 67 coaxially arranged with the sleeve 61 is fixed to the mounting base 10, and the roller 63 is rotatably assembled on the fixed shaft 67. The roller 63 is fitted onto the fixed shaft 67 by a clearance fit to enable the roller 63 to rotate on the fixed shaft 67.

[0057] The limiting slot 65 is located in the upper curved part of the labyrinth raceway 64. Under normal pulling-down conditions, the limiting ball 66 rolls freely in the labyrinth raceway 64. When the sleeve 61 rotates rapidly or is subjected to an instantaneous reverse force, the limiting ball 66 will be embedded in the limiting slot 65 and clamped, so that it cannot rotate in the opposite direction relying solely on the elastic restoring force; when pulled down and released again, the limiting ball 66 will be disengaged from the limiting slot 65 and rotate freely, thus not affecting the reset.

[0058] When the pull-down mechanism is in a state of being pulled downward, the sleeve 61 is driven by the power of the rotation of the first winding rope portion 20 or the second winding rope portion 30 to rotate synchronously. At this time, the limit ball 66 can move in the labyrinth roller 64. When the pull-down mechanism is in a state of being pulled downward quickly or stopped suddenly, the limit ball 66 will fall into the limit groove 65 to form a clamping state, thereby achieving stopping. In the clamping state, if there is still an external force acting, the external force is transmitted to the limit ball 66 through the sleeve 61, and the limit ball 66 pushes the roller 63 to rotate in the positive (clockwise) direction, thereby not affecting the continued pulling down of the curtain. The applied force will only be slightly greater than that required in the unclamped state. Because the limit ball 66 remains in a stuck state, it can be pulled to any position to stop and achieve stopping. If it is necessary to reset, the curtain is released after being pulled downward again. The instantaneous reverse rotational force will cause the limit ball 66 to disengage from the limit groove 65 and return to the labyrinth roller 64. At this time, the ball 66 can rotate freely without affecting the reset rotation.

[0059] When in use, the drawstrings of the first cord-winding portion 20 and the second cord-winding portion 30 are respectively connected to the two sides of the curtain. When the curtain is pulled down, the drawstrings are unwound, and the first cord-winding portion 20 and the second cord-winding portion 30 are driven to rotate relative to each other during the unwinding process. Since the first cord-winding portion 20 and the second cord-winding portion 30 are engaged in transmission, the two will rotate synchronously, and the spring member 40 will be pulled during the rotation process to generate an elastic restoring force. When the curtain is loosened, since the first cord-winding portion 20 and the second cord-winding portion 30 lose the downward pulling force, they will rotate in the opposite direction under the action of the elastic restoring force. When the first cord-winding portion 20 and the second cord-winding portion 30 are instantly reversed, the limiting ball 66 will form a locking state with the limiting card slot 65 that falls into the curtain, so that the curtain The curtain can be stopped after being pulled to any position, and the curtain position can be changed by continuing to pull it down and then stopped, thereby meeting different usage requirements. When the curtain needs to be recovered, the curtain is pulled and then released, so that the limit ball 66 will be out of the engaged state and roll freely in the labyrinth raceway 64. At this time, the first and second winding rope parts 20 and 30 can be reversed and the recovery ropes can be recovered under the action of the elastic restoring force, thereby realizing automatic winding of the curtain. In the process of winding, the damping buffer 50 will be driven to transmit synchronously, so that the elastic restoring force can be buffered under the action of the damping force, slowing down the rotation of the first and second winding rope parts 20 and 30, thereby reducing the impact force caused by the rebound, reducing noise and safety hazards.

[0060] Furthermore, in some embodiments, a limiting torsion spring 69 can be provided at the upper end of the roller 63. The limiting torsion spring 69 is sleeved on the fixed shaft 67 and is loosely fitted with the fixed shaft 67. One end of the limiting torsion spring 69 is fixed to the roller 63 by a screw, and the other end is free. When the roller 63 reverses, the limiting torsion spring 69 has an elastic deformation tendency to limit the rotation of the roller 63.

[0061] When the limiting ball 66 is in a clamped state and the external force is continuously applied, when the sleeve 61 rotates forward, the limiting torsion spring 69 will rotate forward synchronously with the roller 63. At this time, the limiting torsion spring 69 does not have a deformation tendency, so it will not affect the forward rotation of the roller 63. Since one end of the limiting torsion spring 69 is free and the tight fit relationship with the fixed shaft 67 makes the limiting torsion spring 69 have an elastic deformation tendency, so that the roller 63 cannot be reversed and can only rotate forward, so that the ball will not encounter any obstacles in the maze raceway during reset, thereby improving the stability of use and preventing reset jamming.

[0062] The second aspect of the embodiment of the utility model provides a curtain, including a pull rope linkage control device as described in the first aspect, a rope threading hole is opened on the mounting base 10, and the pull ropes on both sides pass through the rope threading holes and are connected to the curtain cloth, so that the stopping and recovery of the curtain cloth can be controlled by the pull rope linkage control device.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any equivalent modifications or variations made by persons skilled in the art without departing from the spirit and technical concepts disclosed herein shall be encompassed by the claims of the present invention.

Claims

1. A pull rope linkage control device, characterized in that: include: Install the base; A first rope winding portion and a second rope winding portion rotatably mounted on the mounting base, the first rope winding portion and the second rope winding portion meshing with each other for transmission and respectively used for winding up the draw rope, and a spring member for generating an elastic restoring force is provided between the first rope winding portion and the second rope winding portion; a damping buffer transmission-connected to the first rope winding portion or the second rope winding portion, for providing a damping force to buffer the elastic restoring force; and A one-way stop mechanism is connected to the first rope winding part or the second rope winding part, and the one-way stop mechanism includes a limiting ball and a labyrinth raceway that cooperate with each other. The limiting ball can engage with the labyrinth raceway when the first rope winding part or the second rope winding part is instantly reversed to realize one-way rotation of the one-way stop mechanism, and can be disengaged from the engaging state to realize free rotation of the one-way stop mechanism.

2. The pull rope linkage control device according to claim 1, characterized in that: The one-way stop mechanism comprises: a sleeve connected to the first rope winding part or the second rope winding part in a transmission manner, wherein the sleeve is provided with a ball groove; A roller rotatably mounted in the sleeve and adapted to the sleeve, the roller being provided with a labyrinth roller track, and the labyrinth roller track being provided with a limit slot; and A limiting ball, which can roll in the ball groove and the labyrinth raceway and drive the roller to rotate in a linked manner, and the limiting ball can be embedded in the limiting slot to limit the instantaneous reversal of the sleeve to achieve unidirectional rotation, and can be disengaged from the limiting slot to allow the sleeve to rotate freely; A fixed shaft coaxially arranged with the sleeve is fixed on the mounting base, and the roller is rotatably assembled on the fixed shaft.

3. The pull rope linkage control device according to claim 2, characterized in that: The first rope winding portion includes: a first gear rotatably mounted on the mounting base; and a first rope loop fixed to the first gear and used for winding up the first side pull rope; The second rope winding portion includes: a second gear rotatably mounted on the mounting base and meshing with the first gear; and A second rope loop is fixed to the second gear and is used for winding up the second side pull rope.

4. The pull rope linkage control device according to claim 3, characterized in that: The spring member is a scroll spring, which is coaxially arranged with the second gear. The first end of the scroll spring is relatively fixed to the first gear, and the second end of the scroll spring is relatively fixed to the mounting base.

5. The pull rope linkage control device according to claim 4, characterized in that: The first rope winding sleeve is provided with a clamping sleeve, and the first end of the volute spring is clamped and fixed to the clamping sleeve; the mounting base is provided with a connecting shaft for rotatably mounting the second gear, the volute spring is sleeved on the connecting shaft, and the second end of the volute spring is fixed to the connecting shaft.

6. The pull rope linkage control device according to claim 4, characterized in that: A third gear rotatably connected to the mounting base is provided at the bottom of the sleeve, and the third gear is meshed with the first gear or the second gear for transmission.

7. The pull rope linkage control device according to claim 4, characterized in that: The damping buffer comprises: a fourth gear rotatably mounted on the first gear or the second gear; a damping shaft fixed to the fourth gear; and A damping sleeve is fixed relatively to the mounting base, wherein damping oil is filled in the damping sleeve, and the damping shaft passes through the damping sleeve and is sealed with the damping sleeve.

8. The pull rope linkage control device according to claim 2, characterized in that: A limiting torsion spring is also provided at the upper end of the roller. The limiting torsion spring is sleeved on the fixed shaft and loosely fits with the fixed shaft. One end of the limiting torsion spring is fixed to the roller and the other end is free. When the roller reverses, the limiting torsion spring has an elastic deformation tendency to limit the rotation of the roller.

9. The pull rope linkage control device according to claim 7, characterized in that: The mounting base is further connected to a top cover, which covers the mounting base; and the top cover is provided with a positioning block for limiting the damping sleeve.

10. A curtain, characterized in that: It comprises a pull rope linkage control device as described in any one of claims 1 to 9.

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