Dual roller day and night shade

Abstract

This invention discloses a double-roller day and night blind, belonging to the field of curtain technology. The transmission module and winding device are both housed within the curtain track. The output end of the transmission box extends into the curtain track. The winding device includes multiple winding shafts. One end of the drive rod is connected to the output end of the transmission box, and the other end of the drive rod passes through both the winding shaft and the transmission module. The transmission module includes a lead screw and a transmission mechanism. Each drive rod has a transmission mechanism, which includes a first transmission wheel. The first transmission wheel is threadedly connected to the lead screw and is connected to the corresponding drive rod. The first transmission wheels of different transmission modules are engaged through their own spiral locking parts, allowing one drive rod to drive another to rotate. This double-roller day and night blind solves the problem of existing double-layer curtains that, during the day, need to maintain a certain level of light transmission, easily result in the wrong winding device being operated when the sheer curtain is pulled down, leading to the lowering of a non-sheer curtain with strong light-blocking properties.

Description

Technical Field

[0001] This invention relates to the field of curtain technology, and in particular to a double-roller day and night curtain. Background Technology

[0002] As living standards improve, people have higher and higher requirements for the quality of curtains used in interior decoration. In order to meet the needs of curtains that can block light during the day while maintaining a certain degree of light transmission, and that can completely block light and maintain absolute privacy at night, double-layer curtains have emerged, as described in Chinese invention patent application number 201110142415.9, which discloses "A Double-Layer Curtain".

[0003] Existing double-layered curtains use separate drawstrings on different winders to control the movement of each curtain panel. At night, a single curtain panel may not provide sufficient blackout for privacy, necessitating the lowering of both panels. Users must first operate one winder to lower one panel, then the other separately. During the day, to maintain some light transmission, simply pulling down the sheer curtain can lead to misalignment of the winders, resulting in the lowering of the non-sheer curtain with higher blackout properties instead of the sheer curtain. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides a dual-roller day and night curtain to solve the above-mentioned problems.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: a double-roller day and night blind, comprising a curtain track, a drive rod, a transmission module, a winder, a transmission box, and a curtain. The transmission module and the winder are both disposed within the curtain track. The transmission box is disposed at one end of the curtain track, and its output end extends into the curtain track. The winder includes multiple winding shafts, each corresponding to a drive rod, an output end of the transmission box, and a curtain piece. One end of the drive rod is connected to the output end of the transmission box, and the other end of the drive rod passes through both the winding shaft and the transmission module. A pull cord is wound around the winding shaft, and the pull cord is connected to the corresponding curtain.

[0006] The transmission module includes a lead screw and a transmission mechanism. Each drive rod is equipped with the transmission mechanism. The transmission mechanism includes a first transmission wheel, which is threadedly connected to the lead screw. The first transmission wheel is also connected to the corresponding drive rod so that the drive rod drives the first transmission wheel to rotate or the first transmission wheel drives the drive rod to rotate. The first transmission wheels of different transmission modules are engaged with each other through their own spiral engagement parts so that one drive rod drives another drive rod to rotate.

[0007] Preferably, the double-roller day and night blind includes two drive rods, two transmission mechanisms, two winders, two output ends of the transmission box, and two curtain panels;

[0008] Each drive rod is equipped with two winding shafts. The two winding shafts on the same drive rod do not belong to the same winder. The winding shafts on the same drive rod are distributed on both sides of the transmission module. The pull lines of the two winding shafts on the same drive rod are respectively connected to both sides of the same curtain, so that the opening and closing of the curtain can be driven by the opening and closing of the pull lines of the winding shafts.

[0009] The two output ends of the transmission box are connected to different drive rods, and the different drive rods are matched with different winding shafts in the same winder.

[0010] Optionally, the transmission module further includes a second transmission wheel, which is sleeved on the drive rod and meshes with the first transmission wheel; the second transmission wheel has a polygonal hole that passes through it, and the drive rod is a polygonal cylinder that cooperates with the polygonal hole, and the drive rod passes through the polygonal hole so that the second transmission wheel can slide along the length direction of the drive rod.

[0011] It is worth noting that in the two adjacent first transmission wheels of the lead screw, the spiral locking parts provided on their opposite surfaces have opposite spiral directions to form complementary locking positions.

[0012] Specifically, the curtain track has a through hole; the winding device also includes a base and a cover, with a mounting cavity formed between the base and the cover, and the winding shaft is disposed in the mounting cavity. Two winding shafts of the same winding device are arranged side by side along a direction perpendicular to the length of the drive rod, and the wires of the two winding shafts are located in the gap between the two winding shafts, and the wires of the two winding shafts pass through the same through hole.

[0013] Preferably, the winding device further includes a connector and a tension roller. The connector is disposed between the two winding shafts and is connected to both winding shafts. The connector has a guide hole facing the through hole, and the wires of the two winding shafts pass through the guide hole. The tension roller is distributed at the outlet of the guide hole.

[0014] It is worth noting that the base has a limiting groove, and the bottom of the limiting groove has a limiting hole. The limiting hole faces the through hole, and the tension roller is disposed in the limiting groove so that the guide hole faces the limiting hole.

[0015] The winding device also includes a guide block, which is connected to the connector. The limiting groove is provided with a sliding groove, and the guide block is slidably disposed in the sliding groove.

[0016] Optionally, the winder further includes rings, which are respectively disposed on both sides of the connector, and the two winding shafts are respectively disposed in the corresponding rings.

[0017] Specifically, the two output ends of the transmission box are divided into a first output end and a second output end; the transmission box includes a base, an intermediate connecting seat, an end cover, a first transmission shaft, and a second transmission shaft;

[0018] A first cavity is formed between the base and the intermediate connecting seat. The first drive shaft passes through the base and connects with the first drive gear located in the first cavity to form the first output end.

[0019] A second cavity is formed between the intermediate connecting seat and the end cover. A second transmission tooth is provided in the second cavity. The shaft of the second transmission tooth passes through the intermediate connecting seat and is located in the first cavity. The second transmission shaft passes through the base and is connected to the shaft of the second transmission tooth located in the first cavity to form the second output end.

[0020] Optionally, the front and back sides of the intermediate connecting seat are respectively provided with a first guide and a second guide; so that a first guide channel is formed in the first cavity by setting the first guide, and the first guide channel faces the first transmission tooth; so that a second guide channel is formed in the second cavity by setting the second guide, and the second guide channel faces the second transmission tooth;

[0021] The first guide and the second guide are respectively disposed at opposite ends of the intermediate connecting seat, so that the direction of the first guide channel toward the outside is opposite to the direction of the second guide channel toward the outside.

[0022] The beneficial effects of this invention are as follows: In the double-roller day and night blind, the output end of the transmission box can drive the corresponding drive rod to rotate; after one drive rod rotates, it can drive the corresponding winding shaft to rotate, realizing the winding or unwinding of the cord, and thus driving the corresponding blind to rise and fall; the winding device on different drive rods will be connected to different slats, so that different slats can be raised and lowered through different winding devices. The first slat is a light-transmitting blind, and the second slat is an opaque blind. When both the first and second slats are retracted, their corresponding first transmission wheels are engaged by their own spiral locking parts. Thus, when the transmission mechanism corresponding to the first slat is driven alone, since the transmission mechanism corresponding to the second slat does not move, it is locked to the screw through the threaded connection, and the transmission mechanism corresponding to the first slat cannot move in the direction of the transmission mechanism corresponding to the second slat. Similarly, when the transmission mechanism corresponding to the second slat is driven alone, the transmission mechanism corresponding to the second slat cannot move in the direction of the transmission mechanism corresponding to the first slat. Thus, only when the transmission mechanism corresponding to the first slat moves away from the transmission mechanism corresponding to the second slat, causing the first transmission wheels of the two transmission mechanisms to lose their engagement, can the transmission mechanism corresponding to the second slat be moved closer to the transmission mechanism corresponding to the first slat under the drive of the drive rod. Therefore, by moving the transmission mechanism corresponding to the first slat away from the transmission mechanism corresponding to the second slat as the action of pulling down the first slat, and by moving the transmission mechanism corresponding to the second slat closer to the transmission module corresponding to the first slat as the action of pulling down the second slat, the function can be achieved that the second slat can only be pulled down after the first slat is pulled down, and vice versa. This prevents the user from accidentally lowering the wrong slat due to operating the wrong winder. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a dual-roller day / night blind in one embodiment of the present invention;

[0024] Figure 2 This is a partial structural diagram of a dual-roller day / night blind in one embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the transmission module in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the drive rod, transmission mechanism, and lead screw in one embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the drive rod, transmission mechanism, and lead screw in another embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the first transmission wheel in one embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the transmission mechanism in one embodiment of the present invention;

[0030] Figure 8 This is a cross-sectional view of the transmission module in one embodiment of the present invention;

[0031] Figure 9 This is an exploded view of the curtain track and winder in one embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the base structure in one embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the winding shaft in one embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram of the connector and collar in one embodiment of the present invention;

[0035] Figure 13 This is a cross-sectional view of a dual-roller day / night blind in one embodiment of the present invention;

[0036] Figure 14 This is an exploded view of the transmission box in one embodiment of the present invention;

[0037] Figure 15 This is an exploded view of the transmission box in another embodiment of the present invention;

[0038] Figure 16 This is a schematic diagram of the transmission box structure in one embodiment of the present invention;

[0039] Figure 17 This is a cross-sectional view of the transmission module in another embodiment of the present invention;

[0040] In the diagram: 1. Curtain track; 11. Perforation; 2. Drive rod; 3. Transmission module; 31. Transmission box; 311. Guide rail; 32. Lead screw; 33. Transmission mechanism; 331. First transmission wheel; 3311. Spiral locking part; 332. Second transmission wheel; 3321. Polygonal hole; 333. Housing; 3331. Guide groove; 4. Winder; 41. Pull cord; 410. Base; 4101. Limiting groove; 4102. Limiting hole; 4103. Slide groove; 411. Cover; 412. Winding shaft; 414. Connector; 415. Guide hole; 416. Tension roller; 417. Guide block; 418. Ring; 419. Bearing; 5. Transmission box; 51. Base; 52. Intermediate connecting seat; 521. First guide component; 522. First guide channel; 523. Second guide component; 524. Second guide channel; 53. End cover; 54. First transmission shaft; 55. Second transmission shaft; 56. First transmission gear; 57. Second transmission gear. Detailed Implementation

[0041] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] like Figure 1-17 As shown, a double-roller day and night blind includes a curtain track 1, a drive rod 2, a transmission module 3, a winder 4, a transmission box 5, and a curtain. The transmission module 3 and the winder 4 are both located within the curtain track 1. The transmission box 5 is located at one end of the curtain track 1, and its output end extends into the curtain track 1. The winder 4 includes multiple winding shafts 412, each corresponding to a drive rod 2, an output end of the transmission box 5, and a curtain piece. One end of the drive rod 2 is connected to the output end of the transmission box 5, and the other end of the drive rod 2 passes through both the winding shaft 412 and the transmission module 3. A pull cord 41 is wound around the winding shaft 412, and the pull cord 41 is connected to the corresponding curtain.

[0043] like Figure 1-5 As shown, the transmission module 3 includes a lead screw 32 and a transmission mechanism 33. Each drive rod 2 is provided with the transmission mechanism 33. The transmission mechanism 33 includes a first transmission wheel 331, which is threadedly connected to the lead screw 32. The first transmission wheel 331 is connected to the corresponding drive rod 2 so that the drive rod 2 drives the first transmission wheel 331 to rotate or the first transmission wheel 331 drives the drive rod 2 to rotate. The first transmission wheels 331 of different transmission modules 3 are engaged with each other through their own spiral engagement parts 3311 so that one drive rod 2 drives another drive rod 2 to rotate.

[0044] In the double-roller day and night blind, the curtain track 1 is fixed to the wall, and the output end of the transmission box 5 can drive the corresponding drive rod 2 to rotate independently. After the drive rod 2 rotates, it can drive the corresponding winding shaft 412 to rotate, realize the winding or unwinding of the cord, and thus drive the corresponding curtain to be raised or lowered. The winding device 4 on different drive rods 2 will be connected to different sashes, so that different sashes can be raised and lowered through different winding devices 4. The first sash is a light-transmitting curtain, and the second sash is an opaque curtain. When both the first and second slats are retracted, their corresponding first drive wheels 331 are engaged by their own spiral locking parts. Thus, when only the drive mechanism 33 corresponding to the first slat is driven, since the drive mechanism 33 corresponding to the second slat is not activated and is locked to the screw via a threaded connection, the drive mechanism 33 corresponding to the first slat cannot move towards the drive mechanism 33 corresponding to the second slat. Similarly, when only the drive mechanism 33 corresponding to the second slat is driven, it cannot move towards the drive mechanism 33 corresponding to the first slat. Therefore, only when the drive mechanism 33 corresponding to the first slat moves away from the drive mechanism 33 corresponding to the second slat, causing the engagement between the first drive wheels of the two drive mechanisms 33 to disengage, can the drive mechanism 33 corresponding to the second slat approach the drive mechanism 33 corresponding to the first slat under the drive of the drive rod. Therefore, by moving the transmission mechanism 33 corresponding to the first slat curtain away from the transmission mechanism 33 corresponding to the second slat curtain, the first slat curtain is pulled down. Conversely, by moving the transmission mechanism 33 corresponding to the second slat curtain closer to the transmission module corresponding to the first slat curtain, the second slat curtain can be pulled down only after the first slat curtain is pulled down. Conversely, the first slat curtain can be retracted only after the second slat curtain is retracted. This prevents users from accidentally lowering the wrong curtain due to operating the wrong winder 4.

[0045] It is worth noting that, such as Figure 1 , 2 As shown in Figures 9, 14, 15, and 16, the double-roller day and night blind includes two drive rods 2, two transmission mechanisms 33, two winders 4, two output ends of the transmission box 5, and two curtain panels.

[0046] Each drive rod 2 is equipped with two winding shafts 412. The two winding shafts 412 located on the same drive rod 2 do not belong to the same winder 4. The winding shafts 412 located on the same drive rod 2 are distributed on both sides of the transmission module 3, that is, the two winders 4 are distributed on both sides of the transmission module 3. The pull lines 41 of the two winding shafts 412 connected to the two sides of the same curtain are respectively connected, so that the curtain can be moved up and down by the pulling lines 41 of the winding shafts 412; so that there are lines connected on both sides of the curtain, and the curtain can maintain balance.

[0047] The two output ends of the transmission box 5 are connected to different drive rods 2, thereby driving the drive rods 2 to rotate. Different drive rods 2 cooperate with different winding shafts 412 in the same winder 4.

[0048] In this embodiment, the two curtains are a sheer curtain and a non-sheer curtain, respectively. The non-sheer curtain has better light-blocking properties than the sheer curtain. The sheer curtain corresponds to a drive rod 2, a transmission mechanism 33, a winding shaft 412 in the same winder 4, and an output end of the transmission box 5. The non-sheer curtain corresponds to another drive rod 2, another transmission mechanism 33, another winding shaft 412 in the same winder 4, and another output end of the transmission box 5.

[0049] Optional, such as Figure 3 , 4 As shown in Figures 5, 7, and 8, the transmission module 3 further includes a second transmission wheel 332, which is sleeved on the drive rod 2 and meshes with the first transmission wheel 331. When the drive rod 2 rotates, it can drive the corresponding winder 4 to rotate, thereby driving the corresponding curtain to move. It can also drive the second transmission wheel 332 to rotate, and then drive the first transmission wheel 331 to rotate through the second transmission wheel 332, so that the first transmission wheel 331 can move on the lead screw 32, causing the first transmission wheel 331 to move along the length direction of the lead screw 32.

[0050] The second transmission wheel 332 has a polygonal hole 3321 that passes through it. The drive rod 2 is a polygonal cylinder that mates with the polygonal hole 3321. The drive rod 2 passes through the polygonal hole 3321 so that the second transmission wheel 332 can slide along the length direction of the drive rod 2. By engaging the polygonal hole 3321 with the polygonal cylinder-shaped drive rod 2, the second transmission wheel 332 and the drive rod 2 can remain stationary in a direction perpendicular to the length of the drive rod 2, while the second transmission wheel 332 can also move relative to the length direction of the drive rod 2. In this way, the drive rod 2 and the second transmission wheel 332 can rotate synchronously, and the second transmission wheel 332 can also slide along the length direction of the drive rod 2.

[0051] The transmission module 3 further includes a housing 333, within which both the first transmission wheel 331 and the second transmission wheel 332 are disposed. The housing 333 protects the first transmission wheel 331 and the second transmission wheel 332. Furthermore, by housing both the first transmission wheel 331 and the second transmission wheel 332 within the housing 333, they can slide synchronously along the length of the lead screw 32. The outer wall of the housing 333 is provided with a guide groove 3331, and the inner wall of the transmission box 31 is provided with a guide rail 311. The guide rail 311 is parallel to the lead screw 32, and the guide groove 3331 is slidably connected to the guide rail 311. The cooperation of the guide groove 3331 and the guide rail 311 provides a guiding function, ensuring that the housing 333 can only move along the length of the lead screw 32.

[0052] Specifically, such as Figure 3 and 6 As shown, in the two adjacent first transmission wheels 331 of the lead screw 32, the spiral engaging portions 3311 on their opposite surfaces have opposite spiral directions to form complementary engaging positions. This allows the two adjacent first transmission wheels 331 to be locked together.

[0053] Preferred, such as Figure 9 As shown, the curtain track 1 has a through hole 11; the winding device 4 also includes a base 410 and a cover 411, with a mounting cavity formed between the base 410 and the cover 411. The winding shaft 412 is disposed in the mounting cavity. Two winding shafts 412 of the same winding device 4 are arranged side by side along a direction perpendicular to the length of the drive rod 2. The wires of the two winding shafts 412 are located in the gap between the two winding shafts 412, and the wires of the two winding shafts 412 pass through the same through hole 11. The ends of the pull cords 41 wound on the two winding shafts 412 are concentrated in the gap, and then passed through the same through hole 11 to connect to the corresponding curtains. In this way, the number of holes to be drilled on the track is reduced, thereby simplifying the processing procedure.

[0054] It is worth noting that, such as Figure 11 and 12 As shown, the winding device 4 also includes a connector 414 and a tension roller 416. The connector 414 is disposed between the two winding shafts 412 and is connected to both winding shafts 412. The connector 414 has a guide hole 415 facing the through hole 11. The wires of the two winding shafts 412 pass through the guide hole 415. The tension roller 416 is distributed at the outlet of the guide hole 415.

[0055] By setting the connector 414, the gap between the two winding shafts 412 can be kept constant, thereby ensuring that both winding shafts 412 can rotate stably within the mounting cavity. Additionally, the guide hole 415 on the connector 414 guides the lead wires from the two winding shafts 412 to the through hole 11. When the tension roller 416 is not set, since the winding directions of the two winding shafts 412 are the same, the lead wire from one winding shaft 412 can smoothly enter the through hole 11, but the lead wire from the other winding shaft 412 can only be forced through the through hole 11. This causes the lead wire from the other winding shaft 412 to become loose, which can easily lead to wire jamming during winding or unwinding. Figure 13 As shown, in this embodiment, located Figure 13 The wire from the left-side winding spool 412 can smoothly enter the through hole 11, located in... Figure 13 If there is no tension roller 416, the wire exiting the right winding shaft 412 can only be forcibly inserted into the through hole 11. In this embodiment, after the tension roller 416 is set, the wires exiting the two winding shafts 412 pass through the guide hole 415 and then contact the tension roller 416, thereby tightening the wires and preventing the wires from becoming loose. Then they are inserted into the through hole 11, which facilitates the winding and unwinding of the two winding shafts 412.

[0056] Preferred, such as Figure 10-12 As shown, the base 410 has a limiting groove 4101, and the bottom of the limiting groove 4101 has a limiting hole 4102. The limiting hole 4102 faces the through hole 11. The tension roller 416 is disposed in the limiting groove 4101 so that the guide hole 415 faces the limiting hole 4102.

[0057] The winding device 4 also includes a guide block 417, which is connected to the connector 414. The limiting groove 4101 is provided with a sliding groove 4103, and the guide block 417 is slidably disposed in the sliding groove 4103.

[0058] After the two winding shafts 412 are installed in the mounting cavity, the tension roller 416 is accommodated by the limiting groove 4101. By providing a limiting hole 4102 at the bottom of the limiting groove 4101, the lead wires of the two winding shafts 412 can pass through the base 410 and through the through hole 11. The guide block 417 and the slide groove 4103 cooperate to limit the two winding shafts 412 and the connector 414 within the base 410.

[0059] Optional, such as Figure 11 and 12As shown, the winding device 4 also includes collars 418, which are respectively disposed on both sides of the connector 414, and two winding shafts 412 are respectively disposed within their corresponding collars 418. In this embodiment, the collars 418 are fixedly connected to the connector 414, and both winding shafts 412 are located within their corresponding collars 418 and can rotate relative to the collars 418. Specifically, as... Figure 9 As shown, each end of the two winding shafts 412 is fitted with a bearing 419, and the outer wall of the bearing 419 is connected to the base 410. By providing the bearings 419, the two winding shafts 412 can rotate relative to the base 410.

[0060] Specifically, such as Figure 14-16 As shown, the two output ends of the transmission box 5 are divided into a first output end and a second output end; the transmission box 5 includes a base 51, an intermediate connecting seat 52, an end cover 53, a first transmission shaft 54 ​​and a second transmission shaft 55.

[0061] A first cavity is formed between the base 51 and the intermediate connecting seat 52. The first drive shaft 54 ​​passes through the base 51 and connects with the first drive tooth 56 located in the first cavity to form the first output end.

[0062] A second cavity is formed between the intermediate connecting seat 52 and the end cover 53. A second transmission tooth 57 is provided in the second cavity. The shaft of the second transmission tooth 57 passes through the intermediate connecting seat 52 and is located in the first cavity. The second transmission shaft 55 passes through the base 51 and is connected to the shaft of the second transmission tooth 57 located in the first cavity to form the second output end.

[0063] The first transmission gear 56 and the second transmission gear 57 are separated and disposed in different cavities to facilitate individual driving. In this embodiment, transmission belts are provided in both the first and second cavities, so that the first transmission gear 56 or the second transmission gear 57 can be driven to rotate independently by an external drive mechanism such as a motor; when the first transmission gear 56 rotates, it drives the corresponding drive rod 2 to rotate via the first transmission shaft 54, and when the second transmission gear 57 rotates, it drives the corresponding drive rod 2 to rotate via the second transmission shaft 55. In this embodiment, as... Figure 8 As shown, the two second transmission wheels 332 are not on the same horizontal plane, so that the first transmission shaft 54 ​​and the second transmission shaft 55, which are arranged on different second transmission wheels 332, are not on the same horizontal plane, or as... Figure 17 As shown, the two second transmission wheels 332 are on the same horizontal plane so that the first transmission shaft 54 ​​and the second transmission shaft 55, which are arranged on different second transmission wheels 332, can be on the same horizontal plane.

[0064] It is worth noting that, such as Figure 14-16 As shown, the front and back sides of the intermediate connecting seat 52 are respectively provided with a first guide member 521 and a second guide member 523; so that a first guide channel 522 is formed in the first cavity by setting the first guide member 521, and the first guide channel 522 faces the first transmission tooth 56; so that a second guide channel 524 is formed in the second cavity by setting the second guide member 523, and the second guide channel 524 faces the second transmission tooth 57;

[0065] The first guide member 521 and the second guide member 523 are respectively disposed at opposite ends of the intermediate connecting seat 52, so that the direction of the first guide channel 522 toward the outside is opposite to the direction of the second guide channel 524 toward the outside.

[0066] like Figure 14-16 As shown, the first guide member 521 is disposed on the front side of the intermediate connecting seat 52 and at the right end of the intermediate connecting seat 52, thereby opening the first guide channel 522 to the right to facilitate the insertion of the transmission belt; the second guide member 523 is disposed on the rear side of the intermediate connecting seat 52 and at the left end of the intermediate connecting seat 52, thereby opening the second guide channel 524 to the left to facilitate the insertion of the transmission belt. Specifically, the first transmission tooth 56 and the first guide member 521 are disposed within the same inner ring formed by the transmission belt, and the second transmission tooth 57 and the second guide member 523 are disposed within the same inner ring formed by the transmission belt.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A double-roller day and night blind, characterized in that: The system includes a curtain track, a drive rod, a transmission module, a cord winder, a transmission box, and a curtain. The transmission module and the cord winder are both housed within the curtain track. The transmission box is located at one end of the curtain track, with its output end extending into the track. The cord winder comprises multiple winding shafts, each corresponding to a drive rod, an output end of the transmission box, and a curtain piece. One end of the drive rod is connected to the output end of the transmission box, and the other end passes through both the winding shaft and the transmission module. A pull cord is wound around the winding shaft and connected to the corresponding curtain. The transmission module includes a lead screw and a transmission mechanism. Each drive rod is equipped with the transmission mechanism. The transmission mechanism includes a first transmission wheel, which is threadedly connected to the lead screw. The first transmission wheel is also connected to the corresponding drive rod so that the drive rod drives the first transmission wheel to rotate or the first transmission wheel drives the drive rod to rotate. The first transmission wheels of different transmission modules are engaged with each other through their own spiral engagement parts so that one drive rod drives another drive rod to rotate.

2. The double-roller day and night blind according to claim 1, characterized in that: The double-roller day and night blind includes two drive rods, two transmission mechanisms, two winders, two output ends of the transmission box, and two curtain panels. Each drive rod is equipped with two winding shafts. The two winding shafts on the same drive rod do not belong to the same winder. The winding shafts on the same drive rod are distributed on both sides of the transmission module. The pull lines of the two winding shafts on the same drive rod are respectively connected to both sides of the same curtain, so that the opening and closing of the curtain can be driven by the opening and closing of the pull lines of the winding shafts. The two output ends of the transmission box are connected to different drive rods, and the different drive rods are matched with different winding shafts in the same winder.

3. A double-roller day and night blind according to claim 1, characterized in that: The transmission module further includes a second transmission wheel, which is sleeved on the drive rod and meshes with the first transmission wheel. The second transmission wheel has a polygonal hole that passes through it. The drive rod is a polygonal cylinder that mates with the polygonal hole. The drive rod passes through the polygonal hole so that the second transmission wheel can slide along the length of the drive rod.

4. A double-roller day and night blind according to claim 1, characterized in that: The spiral engaging portions on the two adjacent first drive wheels of the lead screw have opposite spiral directions to form complementary engagement positions.

5. A double-roller day and night blind according to claim 2, characterized in that: The curtain track has a through hole; the winding device also includes a base and a cover, with a mounting cavity formed between the base and the cover, and the winding shaft is disposed in the mounting cavity. Two winding shafts of the same winding device are arranged side by side along a direction perpendicular to the length of the drive rod, and the wires of the two winding shafts are located in the gap between the two winding shafts, and the wires of the two winding shafts pass through the same through hole.

6. A double-roller day / night blind according to claim 5, characterized in that: The winding device further includes a connector and a tension roller. The connector is disposed between the two winding shafts and is connected to both winding shafts. The connector has a guide hole facing the through hole, and the wires of the two winding shafts pass through the guide hole. The tension roller is distributed at the outlet of the guide hole.

7. A double-roller day / night blind according to claim 6, characterized in that: The base has a limiting groove, and the bottom of the limiting groove has a limiting hole. The limiting hole faces the through hole. The tension roller is disposed in the limiting groove so that the guide hole faces the limiting hole. The winding device also includes a guide block, which is connected to the connector. The limiting groove is provided with a sliding groove, and the guide block is slidably disposed in the sliding groove.

8. A double-roller day and night blind according to claim 6, characterized in that: The winding device also includes rings, which are respectively disposed on both sides of the connector, and two winding shafts are respectively disposed in their corresponding rings.

9. A double-roller day and night blind according to claim 2, characterized in that: The transmission box has two output ends, namely a first output end and a second output end; the transmission box includes a base, an intermediate connecting seat, an end cover, a first transmission shaft and a second transmission shaft. A first cavity is formed between the base and the intermediate connecting seat. The first drive shaft passes through the base and connects with the first drive gear located in the first cavity to form the first output end. A second cavity is formed between the intermediate connecting seat and the end cover. A second transmission tooth is provided in the second cavity. The shaft of the second transmission tooth passes through the intermediate connecting seat and is located in the first cavity. The second transmission shaft passes through the base and is connected to the shaft of the second transmission tooth located in the first cavity to form the second output end.

10. A double-roller day / night blind according to claim 9, characterized in that: The intermediate connecting seat is provided with a first guide and a second guide on its front and back sides, respectively, so that a first guide channel is formed in the first cavity by setting the first guide, and the first guide channel faces the first transmission tooth; so that a second guide channel is formed in the second cavity by setting the second guide, and the second guide channel faces the second transmission tooth; The first guide and the second guide are respectively disposed at opposite ends of the intermediate connecting seat, so that the direction of the first guide channel toward the outside is opposite to the direction of the second guide channel toward the outside.

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