Curtain and rope winding device thereof

Abstract

The embodiment of the invention provides a curtain and a rope winding device thereof. The device comprises a base; the rope winding drum is pivoted on the base and is in transmission connection with an external power device through a coaxially arranged transmission shaft; the inner end of the bearing rope is wound on the rope winding drum, and the outer end of the bearing rope is led out from the rope winding drum and connected to the curtain body; the brake assembly comprises a ratchet wheel which is coaxially fixed with the transmission shaft; the pawl is pivoted on the base through a first pivot and comprises a clamping jaw part clamped and matched with the ratchet wheel and an abutting part used for allowing the bearing rope to be directionally abutted against the pawl part; the first reset spring is used for applying elastic thrust to the clamping jaw component to enable the clamping jaw component to be clamped with ratchets of the ratchet wheel; the outer end of the bearing rope firstly winds around the abutting part and then is connected to the curtain body, and when the bearing rope is tensioned due to pulling force, abutting force is applied to the abutting part so as to enable the clamping jaw part to be separated from the ratchets. According to the embodiment, component layout design can be conveniently carried out, and the pawl can be prompted to return quickly.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of curtain accessories, and in particular to a curtain and a cord winding device thereof. Background Art

[0002] A conventional curtain comprises an upper beam, two curtain cord winding devices assembled on the upper beam at a predetermined distance, a curtain body disposed below the upper beam and connected to the curtain cord winding devices, and a power device for driving the curtain cord winding devices to raise the curtain body. The curtain cord winding device further comprises a base, a rope drum pivotally mounted on the base and connected to the power device via a transmission shaft, and a load rope wound around the rope drum, the outer end of the load rope extending from the rope drum and connected to the curtain body; and a brake assembly assembled on the base. In which, the brake assembly includes a ratchet coaxially fixed with the transmission shaft; and a pawl pivotally mounted on the base and used to unidirectionally lock the ratchet. The load-bearing rope is led out from the rope drum and then wound around one end of the pawl and then connected to the curtain body. When the curtain body is pulled down, the load-bearing rope is tightened and exerts a resisting force on the pawl, causing the pawl to rotate and disengage from the ratchet. The rope drum can then rotate to release the load-bearing rope, and the curtain body can continue to descend. When the load-bearing rope is slack, the pawl is not subjected to the resisting force of the load-bearing rope and returns to a position engaged with the ratchet under gravity, so that the rope drum can only rotate unidirectionally in the direction of winding up the load-bearing rope. Since two curtain rope winding devices are usually arranged on the upper beam at the two ends corresponding to the width direction of the curtain body, during the process of pulling down the curtain body, if the curtain body appears to be in an unbalanced state with one end higher than the other end, at this time, the load-bearing rope corresponding to the relatively higher end of the curtain body is not tightened but will become loose, and the brake assembly in the corresponding curtain rope winding device will be clamped on the ratchet by the pawl, the transmission shaft cannot rotate, and the rope winding drum cannot release the load-bearing rope, thereby preventing the curtain body from continuing to descend.

[0003] During implementation, the inventors discovered that the pawl in the brake assembly relies on its own gravity to return to its original position, which severely limits its placement and hinders the layout design of the various components of the cord winding device. Furthermore, if the support cord on one side becomes slack during the curtain lowering process, the corresponding pawl may not return to its original position in a timely manner. This not only causes the curtain to continue to be pulled down in an unbalanced state, but also makes it easy for the slack support cord to become tangled or snagged, thus affecting the normal use of the curtain. SUMMARY OF THE INVENTION Technical issues

[0004] The technical problem to be solved by the embodiments of the present application is to provide a curtain cord winding device that can facilitate component layout design and can prompt the pawl to return to its original position quickly.

[0005] A further technical problem to be solved by the embodiments of the present application is to provide a curtain that can facilitate the rapid return of the ratchet of the rope winding device and effectively prevent the curtain body from falling unbalancedly. Solution

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions: a curtain cord winding device, comprising:

[0007] A base assembled on the upper beam of the curtain;

[0008] A rope drum pivotally mounted on the base and connected to an external power device via a coaxially arranged transmission shaft;

[0009] A carrying rope having an inner end wound around the rope drum and an outer end drawn out from the rope drum and connected to a curtain body of the curtain; and

[0010] A brake assembly assembled on the base, the brake assembly comprising:

[0011] a ratchet wheel coaxially fixed to the transmission shaft;

[0012] a pawl pivotally mounted on the base via a first pivot and configured to control the unidirectional rotation of the ratchet wheel, the pawl comprising a pawl component engaged with the ratchet teeth of the ratchet wheel and a pressing component for the carrying rope to be pressed against the pawl in a directional manner; and

[0013] a first return spring assembled on the base and used for applying elastic thrust to the claw component to keep the claw component engaged with the ratchet teeth of the ratchet wheel;

[0014] The outer end of the carrying rope is led out from the rope drum, firstly passes through the pressing component and then is connected to the curtain body. When the carrying rope is tightened by tension, it applies a pressing force to the pressing component to prompt the claw component to overcome the elastic thrust and rotate to a position disengaged from the ratchet.

[0015] Furthermore, the claw component and the pressing component are two independent components manufactured separately, one end of the claw component is formed with a claw for engaging with the ratchet and the other end is pivoted on the base by means of the first pivot, the pressing component includes a transmission rod with a middle section pivoted to the base by means of a second pivot and the opposite ends respectively constituting a control end and a driving end, the carrying rope is pressed against the control end, and the driving end is in contact with one end of the claw component formed with the claw, and when the carrying rope is taut, it presses the control end so that when the pressing component rotates, the driving end pushes the claw component to disengage the claw from the ratchet.

[0016] Furthermore, the claw component is formed with a socket at one end of the claw, and the end of the driving end is correspondingly formed with a push block that is movably inserted into the socket and abuts against the inner wall of the socket on the side away from the ratchet.

[0017] Furthermore, the pressing component further includes: a second return spring for pushing the transmission rod to rotate to a position where the pawl is engaged with the ratchet.

[0018] Furthermore, a first receiving groove is provided on the side of the pawl facing away from the ratchet wheel, and the middle section of the first pivot is placed in the first receiving groove, and the opposite two ends pass through the opposite side walls of the first receiving groove for pivotal connection to the corresponding first pivot holes on the base. The middle section of the first pivot is also pivotally connected to a first pressing seat, and the opposite two ends of the first return spring are respectively pressed against the bottom wall of the first receiving groove and the first pressing seat, and the first pressing seat is also formed with a first positioning portion that limits the position of the first return spring.

[0019] Furthermore, the first positioning portion is a first side baffle extending from the first pressure seat toward the opposite sides of one side of the bottom wall of the first receiving groove and parallel to the opposite side walls of the first receiving groove, and the first return spring is a first torsion spring correspondingly arranged on the middle section of the first pivot and located between the two first side baffles, and the two torsion arms of the first torsion spring respectively press against the bottom wall of the first receiving groove and the first pressure seat.

[0020] Furthermore, a second receiving groove is provided on the side of the transmission rod facing away from the ratchet, the middle section of the second pivot is placed in the second receiving groove, and the opposite ends pass through the opposite side walls of the second receiving groove for pivotal connection to the second pivot holes correspondingly provided on the base, the middle section of the second pivot is also pivotally connected to a second pressing seat, the opposite ends of the second return spring are respectively pressed against the bottom wall of the second receiving groove and the second pressing seat, and the second pressing seat is also formed with a second positioning portion that limits the position of the second return spring.

[0021] Furthermore, the second positioning portion is a second side baffle extending from the second pressing seat toward the opposite sides of one side of the bottom wall of the second receiving groove and parallel to the opposite side walls of the second receiving groove, and the second return spring is a second torsion spring correspondingly arranged on the middle section of the second pivot and located between the two second side baffles, and the two torsion arms of the second torsion spring respectively press against the bottom wall of the second receiving groove and the second pressing seat.

[0022] Furthermore, the pressing component is provided with a rope groove for the load-bearing rope to pass through in a directional manner, and a notch is provided on one side of the rope groove for the load-bearing rope to be installed in the rope groove, and the tops of the groove side walls on both sides of the notch are staggered and protrude toward each other to form a block for preventing the load-bearing rope from sliding out of the rope groove, and the opposite ends of the rope groove are also provided with end openings connected to the notch and for the load-bearing rope to slide in and out of the rope groove, and the groove bottom wall of the rope groove is provided with a guide rod with a smooth outer wall for the load-bearing rope to press.

[0023] On the other hand, in order to solve the above-mentioned further technical problems, the embodiments of the present application further provide the following technical solutions: a curtain, comprising an upper beam, two curtain rope winding devices assembled on the upper beam at a predetermined interval, and a curtain body arranged below the upper beam and connected to the curtain rope winding devices, and a power device for synchronously driving the two rope winding devices to work to lift the curtain body, wherein the curtain rope winding device is a curtain rope winding device as described in any one of the above items. Beneficial effects

[0024] By adopting the above technical solution, the embodiment of the present application has at least the following beneficial effects: by adding a first return spring to the base to elastically press against the pawl component of the brake assembly, the embodiment of the present application can constantly push the pawl component to maintain engagement with the ratchet teeth of the ratchet wheel, without relying on the pawl's own weight to maintain engagement with the ratchet teeth. This allows for more flexible design of the pawl position, facilitates the spatial layout design of the various components within the rope winding device, makes the internal structure of the rope winding device more compact, and reduces the overall volume of the rope winding device. When applied to a curtain, a rope winding device is provided at each end of the upper beam to connect to the curtain body. During the process of pulling down the curtain body, if the curtain body tilts, the load rope of the rope winding device located at the higher end of the curtain body will slack. The elastic thrust of the corresponding first return spring ensures that the pawl component quickly returns to its original position and reengages with the ratchet teeth of the ratchet wheel, thereby preventing the transmission shaft coaxially connected to the ratchet wheel from rotating, preventing the curtain body from being pulled down further, and thus preventing the curtain body from being unbalanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the disassembled structure of an optional embodiment of the curtain of this application.

[0026] Figure 2 This is a schematic diagram of the disassembled structure of an optional embodiment of the curtain rope winding device of the present application installed on the base part.

[0027] Figure 3 This is a schematic diagram of the disassembled structure of the brake assembly of an optional embodiment of the curtain rope winding device of the present application.

[0028] Figure 4This is a schematic cross-sectional view of the structure of an optional embodiment of the curtain cord winding device of the present application when the pawl component of the brake assembly is engaged with a ratchet tooth of the ratchet wheel.

[0029] Figure 5 This is a schematic cross-sectional view of the structure of an optional embodiment of the curtain cord winding device of the present application when the pawl component of the brake assembly is separated from a ratchet tooth of the ratchet wheel.

[0030] Figure 6 This is a schematic diagram of the disassembled structure of another optional embodiment of the curtain rope winding device of the present application installed on the base part.

[0031] Figure 7 This is a schematic diagram of the disassembled structure of the brake assembly of another optional embodiment of the curtain cord winding device of the present application.

[0032] Figure 8 This is a schematic cross-sectional view of the structure of a further optional embodiment of the curtain cord winding device of the present application, when a pawl component of a brake assembly is engaged with a ratchet tooth of a ratchet wheel.

[0033] Figure 9 This is a schematic cross-sectional view of the structure of a further optional embodiment of the curtain cord winding device of the present application, when the pawl component of the brake assembly is separated from a ratchet tooth of the ratchet wheel. Modes for Carrying Out the Invention

[0034] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present application and are not intended to limit the present application. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0035] like Figures 1-9 As shown, an optional embodiment of the present application provides a curtain cord winding device 1, comprising:

[0036] A base 10 assembled on the upper beam 3 of the curtain;

[0037] A rope drum 12 is pivotally mounted on the base 10 and is connected to the external power device 4 via a coaxial transmission shaft 11;

[0038] The inner end of the rope is wound around the rope drum 12, and the outer end is drawn out from the rope drum 12 and connected to the curtain body 5 of the curtain; and

[0039] A brake assembly 14 assembled on the base 10 includes:

[0040] a ratchet 141 coaxially fixed to the transmission shaft 11;

[0041] A pawl 143 is pivotally mounted on the base 10 via a first pivot 142 and is used to control the unidirectional rotation of the ratchet 141. The pawl 143 includes a claw component 1430 that engages with the ratchet teeth 1410 of the ratchet 141 and a pressing component 1432 for the carrying rope 13 to be pressed against the pawl 143; and

[0042] a first return spring 145 assembled on the base 10 and used to apply elastic thrust to the claw member 1430 so that the claw member 1430 maintains engagement with the ratchet teeth 1410 of the ratchet wheel 141 ;

[0043] The outer end of the carrying rope 13 is led out from the rope drum 12 and first passes through the pressing component 1432 before being connected to the curtain body. When the carrying rope 13 is tightened by tension, it applies a pressing force to the pressing component 1432 to prompt the claw component 1430 to overcome the elastic thrust and rotate to a position disengaged from the ratchet 1410.

[0044] The embodiment of the present application adds a first return spring 145 to the base 10 to always elastically press the pawl component 1430 of the brake assembly 14, and can always push the pawl component 1430 to keep it engaged with the ratchet teeth 1410 of the ratchet 141, and does not rely on the gravity of the pawl 143 itself to keep it engaged with the ratchet teeth 1410, so that the position of the pawl 143 can be designed more flexibly, which is beneficial to the spatial layout design of the internal components of the rope winding device 1, making the internal structure of the rope winding device 1 more compact and reducing the overall volume of the rope winding device 1. When applied to curtains, a rope winding device 1 is provided at each end of the upper beam 3 to connect the curtain body. During the process of pulling down the curtain body 5, once the curtain body 5 is tilted, the load-bearing rope of the rope winding device 1 at the higher end of the curtain body 5 will become loose, and the elastic thrust of the corresponding first return spring 145 can ensure that the claw component 1430 quickly returns to its position and then engages with the ratchet teeth 1410 of the ratchet 141, thereby preventing the rotation of the transmission shaft 11 coaxially connected to the ratchet 141, and the curtain body 5 can no longer be pulled down, thereby avoiding the unbalanced descent of the curtain body 5.

[0045] In an optional embodiment of the present application, Figure 2-Figure 5As shown, the claw component 1430 and the pressing component 1432 are two separate independent components. One end of the claw component 1430 is formed with a claw 1430a for engaging with the ratchet 1410, and the other end is pivotally mounted on the base 10 by means of the first pivot 142. The pressing component 1432 includes a middle section pivotally connected to the base 10 by means of a second pivot 1434a, and the opposite ends respectively constitute a control end 1434b and a driving end 1434b. The transmission rod 1434 has a transmission end 1434c, and the carrying rope 13 is pressed against the control end 1434b. The driving end 1434c is in contact with one end of the claw 1430a formed on the claw component 1430. When the carrying rope 13 is taut, it presses against the control end 1434b to make the pressing component 1432 rotate. The driving end 1434c pushes the claw component 1430 to disengage the claw 1430a from the ratchet 1410.

[0046] In this embodiment, during operation, the tightened carrying rope 13 presses the control end 1434b of the transmission rod 1434, causing the transmission rod 1434 to rotate around the second pivot 1434a. Since one end of the claw component 1430 is pivoted on the base 10 by means of the first pivot 142 and the other end is formed with a claw 1430a, the claw 1430a is engaged with the ratchet 1410 under the elastic pushing action of the first return torsion spring 145. At the same time, the driving end 1434c of the transmission rod 1434 is engaged with the claw component 143 0 is formed with one end of the claw 1430a abutting against each other, so when the transmission rod 1434 rotates around the second pivot 1434a, the transmission rod 1434 pushes the end of the claw component 1430 with the claw 1430a through the driving end 1434c to overcome the elastic force of the first return torsion spring 145 and rotate around the first pivot 142, thereby separating the claw 1430a from the ratchet 1410; when the carrying rope 13 is slack, the transmission rod 1434 and the claw component 1430 can be automatically reset under the action of the first return torsion spring 145.

[0047] In an optional embodiment of the present application, Figure 3-Figure 5 As shown, one end of the claw component 1430 having the claw 1430a is further formed with a socket 1430b, and the distal end of the driving end 1434c is correspondingly formed with a push block 1434d that is movably inserted into the socket 1430b and abuts against an inner wall of the socket 1430b on a side away from the ratchet 141. In this embodiment, the driving end 1434c of the transmission rod 1434 is movably inserted into the socket 1430b of the claw component 1430 via the push block 1434d. The push block 1434d cooperates with the socket 1430b to achieve a stable push-fitting between the transmission rod 1434 and the claw component 1430.

[0048] In an optional embodiment of the present application, Figure 3-Figure 5 As shown, the pressing component 1432 further includes a second return spring 1436 for pushing the transmission rod 1434 to rotate to a position where the pawl 1430a engages with the ratchet 1410. In this embodiment, the pressing component 1432 further includes the second return spring 1436, which can assist the first return torsion spring 145 in automatically returning the transmission rod 1434.

[0049] In specific implementation, Figure 6-Figure 9 In the illustrated embodiment, the claw member 1430 and the pressing member 1432 are integrally formed and disposed on either side of the first pivot 142. One end of the claw member 1430 is formed with a claw 1430a for engaging with the ratchet 1410. Since the claw member 1430 and the pressing member 1432 are directly integrally formed, the pawl 143 can be directly assembled to the base 10, simplifying the assembly structure.

[0050] In an optional embodiment of the present application, Figure 3-Figure 5 、 Figure 7-Figure 9 As shown, the pawl 143 is provided with a first receiving groove 143a on the side away from the ratchet wheel 141. The middle section of the first pivot 142 is placed in the first receiving groove 143a. The opposite ends of the first pivot 142 pass through the opposite side walls of the first receiving groove 143a to be pivotally connected to the corresponding first pivot holes 101a provided on the base 10 (as shown in FIG. Figure 7 (As shown), the middle section of the first pivot 142 is further pivotally connected to a first pressing seat 143b. The opposite ends of the first return spring 145 respectively press against the bottom wall of the first receiving groove 143a and the first pressing seat 143b. The first pressing seat 143b is also formed with a first positioning portion 143c that defines the position of the first return spring 145. In this embodiment, by providing the first receiving groove 143a to accommodate the first return spring 145, the occupied space can be effectively reduced. The first return spring 145 is also pressed against the base 10 via the first pressing seat 143b, which facilitates the first return spring 145 to smoothly release its elastic thrust. The first pressing seat 143b is also provided with a first positioning portion 143c to prevent the first return spring 145 from being deformed and shifted during the extension and retraction process.

[0051] In an optional embodiment of the present application, Figure 3-Figure 5 、 Figure 7-Figure 9As shown, the first positioning portion 143c is a first side plate extending from the first pressing seat 143b toward opposite sides of one side of the bottom wall of the first receiving groove 143a, parallel to the opposite side walls of the first receiving groove 143a. The first return spring 145 is a first torsion spring correspondingly mounted on the middle section of the first pivot 142 and located between the two first side plates 143c. The two torsion arms of the first torsion spring 145 respectively press against the bottom wall of the first receiving groove 143a and the first pressing seat 143b. In this embodiment, the first return spring 145 is a first torsion spring mounted on the middle section of the first pivot 142. This not only allows the first torsion spring to be positioned using the first pivot 142, but also facilitates the two torsion arms of the first torsion spring to smoothly release torsional force through twisting. In addition, the first positioning portion 143c is a first side plate extending from the first pressing seat 143b, thereby effectively confining the torsion arms of the first torsion spring to the first pressing seat 143b.

[0052] In an optional embodiment of the present application, Figure 3-Figure 5 As shown, the transmission rod 1434 is provided with a second receiving groove 1434e on the side away from the ratchet 141, and the middle section of the second pivot 1434a is placed in the second receiving groove 1434e, and the opposite ends thereof penetrate the opposite side walls of the second receiving groove 1434e for pivoting to the corresponding second pivot holes 101b provided on the base 10 (as shown in FIG. Figure 3 (as shown), the middle section of the second pivot 1434a is further pivotally connected to a second pressing seat 1434f, and the opposite ends of the second return spring 1436 respectively press against the bottom wall of the second receiving groove 1434e and the second pressing seat 1434f. The second pressing seat 1434f is also formed with a second positioning portion 1434g that defines the position of the second return spring 1436. In this embodiment, by providing the second receiving groove 1434e to accommodate the second return spring 1436, the occupied space can be effectively reduced. The second return spring 1436 is also pressed against the base 10 through the second pressing seat 1434f, which facilitates the second return spring 1436 to smoothly release its elastic thrust. The second pressing seat 1434f is also provided with a second positioning portion 1434g to prevent the second return spring 1436 from being deformed and shifted during the extension and retraction process.

[0053] In an optional embodiment of the present application, Figure 3-Figure 5As shown, the second positioning portion 1434g is a second side baffle extending from the second pressing seat 1434f toward the opposite sides of one side of the bottom wall of the second receiving groove 1434e and parallel to the opposite side walls of the second receiving groove 1434e, and the second return spring 1436 is a second torsion spring correspondingly arranged on the middle section of the second pivot 1434a and located between the two second side baffles 1434g, and the two torsion arms of the second torsion spring 1436 are respectively pressed against the bottom wall of the second receiving groove 1434e and the second pressing seat 1434f. In this embodiment, the second return spring 1436 adopts a second torsion spring sleeved on the middle section of the second pivot 1434a, which not only can utilize the second pivot 1434a to realize the positioning of the second torsion spring, but also facilitates the two torsion arms of the second torsion spring to release the torsional force smoothly through twisting; in addition, the second positioning portion 1434g adopts a second side baffle extending from the second pressure seat 1434f, so as to effectively limit the torsion arm of the second torsion spring on the second pressure seat 1434f.

[0054] In an optional embodiment of the present application, Figure 3-Figure 5 、 Figure 7-Figure 9 As shown, the pressing component 1432 is provided with a rope groove 1438 for the carrying rope 13 to pass through in a directional manner, and a slot 1438a is provided on one side of the rope groove 1438 for the carrying rope 13 to be installed into the rope groove 1438, and the tops of the groove side walls on both sides of the slot 1438a are staggered and protrude toward opposite directions to form a stopper 1438b for preventing the carrying rope 13 from sliding out of the rope groove 1438, and the opposite ends of the rope groove 1438 are also provided with end openings 1438c connected with the slot 1438a and for the carrying rope 13 to slide in and out of the rope groove 1438, and the groove bottom wall of the rope groove 1438 is provided with a guide rod 1438d with a smooth outer wall for the carrying rope 13 to press. In this embodiment, a rope groove 1438 is further provided on the pressing component 1432. During the specific assembly, the load-bearing rope 13 can be directly inserted into the rope groove 1438 from the notch 1438a of the rope groove 1438. It is not only convenient for assembly, but also the load-bearing rope 13 is not easily separated from the pressing component 1432 of the pawl 143, ensuring that the load-bearing rope 13 stably applies a pressing force when tightened; and the guide rod 1438d is assembled in the rope groove 1438. During the process of retracting and releasing the load-bearing rope 13, it abuts against the guide rod 1438d with a smooth outer wall, thereby reducing the wear of the load-bearing rope 13 and extending its service life.

[0055] In specific implementation, Figure 2-Figure 9As shown, the base 10 includes a mounting base 101 for pivotally mounting the rope drum 12 thereon, and a brake box 103 fixedly assembled to one end of the mounting base 101. The transmission shaft 11 passes through the mounting base 101 and the brake box 103 in sequence. The brake assembly 14 is assembled in the brake box 103. A side wall of the brake box 103 is provided with an opening 1030 through which one end of the pressing component 1432 of the pawl 143 is exposed. In this embodiment, the base 10 includes the mounting base 101 and the brake box 103. The brake box 103 accommodates the brake assembly 14. During assembly, the brake box 103 with the brake assembly 14 assembled therein can be directly assembled to one end of the mounting base 101. Then, the load rope 13 is passed around the pressing component 1432 exposed from a side wall of the brake box 103b. This can effectively facilitate assembly and optimize the structural layout.

[0056] On the other hand, Figure 1 As shown, another embodiment of the present application provides a curtain, comprising an upper beam 3, two curtain cord winding devices 1 assembled on the upper beam 3 at a predetermined interval, a curtain body 5 disposed below the upper beam 3 and connected to the curtain cord winding devices 1, and a power device 4 for synchronously driving the two cord winding devices 1 to work and lift the curtain body 5. The curtain cord winding device is any of the above-mentioned embodiments. The curtain of this embodiment uses the cord winding device 1 provided by any of the above-mentioned embodiments. During the process of pulling down the curtain body 5, if the curtain body 5 tilts, the load cord of the cord winding device 1 located at the higher end of the curtain body 5 will slack. The elastic thrust of the corresponding first return spring 145 ensures that the claw component 1430 quickly returns to its original position and reengages with the ratchet teeth 1410 of the ratchet wheel 141, thereby preventing the transmission shaft 11 coaxially connected to the ratchet wheel 141 from rotating. The curtain body 5 can no longer be pulled down, thereby preventing the curtain body 5 from falling unbalanced.

[0057] In specific implementation, although Figure 1 The illustrated curtain is a Venetian blind, but the curtain provided in this embodiment can also be applied to cellular blinds and Roman blinds, which utilize a load cord 13 to raise and lower the curtain body 5. The two curtain cord winding devices 1 are connected to the same power unit 4, ensuring synchronization between the retraction and extension of the load cord 13 by the two curtain cord winding devices 1 and reducing costs. In a specific implementation, the power unit 4 can be a spring motor drive and assembled between the two curtain cord winding devices 1, facilitating structural layout.

[0058] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, which all fall within the scope of protection of this application.

Claims

1. A curtain cord winding device, comprising: A base assembled on the upper beam of the curtain; A rope drum pivotally mounted on the base and connected to an external power device via a coaxially arranged transmission shaft; A carrying rope having an inner end wound around the rope drum and an outer end drawn out from the rope drum and connected to a curtain body of the curtain; and a brake assembly assembled on the base, the brake assembly comprising a ratchet coaxially fixed with the transmission shaft and a pawl pivotally mounted on the base via a first pivot and used to control the unidirectional rotation of the ratchet, the pawl comprising a pawl component engaged with the ratchet teeth of the ratchet and a pressing component for the carrying rope to be pressed against the pawl in a directional manner; Characterized in that the brake assembly further comprises: a first return spring assembled on the base and used for applying elastic thrust to the claw component to keep the claw component engaged with the ratchet teeth of the ratchet wheel; The outer end of the carrying rope is led out from the rope drum, firstly passes through the pressing component and then is connected to the curtain body. When the carrying rope is tightened by tension, it applies a pressing force to the pressing component to prompt the claw component to overcome the elastic thrust and rotate to a position disengaged from the ratchet.

2. The curtain cord winding device according to claim 1, wherein: The claw component and the pressing component are two independent components manufactured separately. One end of the claw component is formed with a claw for engaging with the ratchet and the other end is pivoted on the base with the help of the first pivot. The pressing component includes a transmission rod with a middle section pivoted to the base with the help of a second pivot and the opposite ends respectively constituting a control end and a driving end. The carrying rope is pressed against the control end, and the driving end is in contact with one end of the claw component formed with the claw. When the carrying rope is taut, it presses against the control end so that when the pressing component rotates, the driving end pushes the claw component to disengage the claw from the ratchet.

3. The curtain cord winding device according to claim 2, wherein: The claw component is formed with an end having the claw and an insertion hole, and the end of the driving end is correspondingly formed into a push block which is movably inserted into the insertion hole and abuts against the inner wall of the insertion hole on a side away from the ratchet.

4. The curtain cord winding device according to claim 2, wherein: The pressing component further includes a second return spring for pushing the transmission rod to rotate to a position where the pawl is forced to engage with the ratchet.

5. The curtain cord winding device according to claim 1, wherein: A first receiving groove is provided on the side of the pawl facing away from the ratchet wheel, and the middle section of the first pivot is placed in the first receiving groove, and the opposite ends pass through the opposite side walls of the first receiving groove for pivotal connection to the corresponding first pivot holes on the base. The middle section of the first pivot is also pivotally connected to a first pressing seat, and the opposite ends of the first return spring are respectively pressed against the bottom wall of the first receiving groove and the first pressing seat, and the first pressing seat is also formed with a first positioning portion that limits the position of the first return spring.

6. The curtain cord winding device according to claim 5, characterized in that: The first positioning portion is a first side baffle extending from the first pressure seat toward the opposite sides of one side of the bottom wall of the first receiving groove and parallel to the opposite side walls of the first receiving groove. The first return spring is a first torsion spring correspondingly arranged on the middle section of the first pivot and located between the two first side baffles. The two torsion arms of the first torsion spring respectively press against the bottom wall of the first receiving groove and the first pressure seat.

7. The curtain cord winding device according to claim 4, wherein: A second receiving groove is provided on the side of the transmission rod facing away from the ratchet wheel, and the middle section of the second pivot is placed in the second receiving groove, and the opposite ends pass through the opposite side walls of the second receiving groove for pivotal connection to the second pivot holes correspondingly provided on the base. The middle section of the second pivot is also pivotally connected to a second pressing seat, and the opposite ends of the second return spring are respectively pressed against the bottom wall of the second receiving groove and the second pressing seat, and the second pressing seat is also formed with a second positioning portion that limits the position of the second return spring.

8. The curtain cord winding device according to claim 7, wherein: The second positioning portion is a second side baffle extending from the second pressing seat toward the opposite sides of one side of the bottom wall of the second receiving groove and parallel to the opposite side walls of the second receiving groove. The second return spring is a second torsion spring correspondingly arranged on the middle section of the second pivot and located between the two second side baffles. The two torsion arms of the second torsion spring respectively press against the bottom wall of the second receiving groove and the second pressing seat.

9. The curtain cord winding device according to claim 1, wherein: The pressing component is provided with a rope groove for the load-bearing rope to pass through in a directional manner, and a notch is provided on one side of the rope groove for the load-bearing rope to be installed in the rope groove, and the tops of the groove side walls on both sides of the notch are staggered and protrude toward each other to form a block for preventing the load-bearing rope from sliding out of the rope groove, and the opposite ends of the rope groove are also provided with end openings connected to the notch and for the load-bearing rope to slide in and out of the rope groove, and the groove bottom wall of the rope groove is provided with a guide rod with a smooth outer wall for the load-bearing rope to press.

10. A curtain comprising an upper beam, two rope winding devices assembled on the upper beam at a predetermined interval, a curtain body arranged below the upper beam and connected to the rope winding devices, and a power device for synchronously driving the two rope winding devices to work to lift the curtain body, characterized in that: The rope winding device is the curtain rope winding device according to any one of claims 1 to 9.

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