A method for operating a day and night curtain, a day and night curtain system, and a day and night curtain.

Abstract

This invention belongs to the technical field of day and night blinds, and particularly relates to a day and night blind operation method, a day and night blind system, and a day and night blind. This solution differs from the traditional full-light-transmitting operation of a day blind descending to its lower limit position in that it first determines the distance between the current positions of the day blind and night blind rods before operation. Before the day blind rod reaches its lower limit position, the distance between the two rods must be equal to a safety distance. Therefore, this solution first moves the day blind rod closer to the night blind rod to ensure the safety distance is met before proceeding with the operation to move the day blind rod to its lower limit position. Furthermore, by moving the day blind and night blind rods synchronously downwards, it ensures that the first suspension rope of the day blind rod and the second suspension rope of the night blind rod remain taut, preventing slackness.

Description

Technical Field

[0001] This invention belongs to the technical field of day and night curtains, and particularly relates to a day and night curtain operation method, a day and night curtain system, and a day and night curtain. Background Technology

[0002] Day and night blinds are a type of curtain that consists of a thin, light-transmitting first curtain (also called a day blind) and a light-blocking curtain (a night blind) connected together. A corresponding roller cord device controls the hanging cord to raise and lower the corresponding curtain. Currently, day and night blinds have the night blind attached to the bottom of the day blind, allowing direct control of the opening percentage of either the day blind or the night blind, or the day blind and night blind can be folded together to achieve light adjustment and opening.

[0003] In the structure of day and night blind products, both the first and second motors use independent rope winders to wind up the hanging ropes, facilitating the up and down control of the day and night blind rods. However, for some day and night blinds that require the hanging ropes to be wound onto the rope winder in a specific position (such as spirally wound in a thread shape), it is necessary to ensure that the hanging ropes remain taut during operation. If the hanging ropes are wound onto the rope winder in a loose state, the position of the hanging ropes on the rope winder cannot be controlled, ultimately causing the positioning of the entire day and night blind system to fail. Summary of the Invention

[0004] The purpose of this invention is to provide a method for operating day and night curtains, which adds a protective operating method to the daily operation of day and night curtains, thereby enabling the day and night curtains to operate with the suspension ropes in a taut state.

[0005] Based on this, the present invention also provides a method for operating day and night blinds, including a full-light-transmitting operation of the day blind descending to the lower limit L2 of the day blind, and after the day blind descends, determining the distance between the day blind rod and the night blind rod:

[0006] If the distance between the day curtain rod and the night curtain rod is greater than the safety distance V, the night curtain rod will stop, and the day curtain rod will move in the direction of the night curtain rod until the distance between the day curtain rod and the night curtain rod is equal to the safety distance V. After the day curtain is lowered again, the day curtain rod and the night curtain rod will move down synchronously. The day curtain rod will eventually move to the lower limit L2 of the day curtain, and the night curtain rod will eventually move to the lower limit N2 of the night curtain.

[0007] If the distance between the day curtain rod and the night curtain rod is equal to the safety distance V, the day curtain rod and the night curtain rod will move down synchronously. The day curtain rod will eventually move to the lower limit L2 of the day curtain, and the night curtain rod will eventually move to the lower limit N2 of the night curtain.

[0008] In the day / night curtain operation method described above, the safety distance V = M + E;

[0009] M is the distance between the upper limit position L1 of the day curtain rod and the upper limit position N1 of the night curtain rod;

[0010] E is a preset security value of the system, where E > 0.

[0011] In the day and night curtain operation method described above, when determining the distance between the day curtain rod and the night curtain rod, the current position L of the day curtain rod is used as a reference. P The travel C1 of the daytime blind rod is obtained from the upper limit L1 of the daytime blind rod, and the current position N of the nighttime blind rod is determined. P The stroke D1 of the night curtain lever is obtained from the upper limit switch N1;

[0012] If D1-C1>E, then it is determined that the distance between the day curtain rod and the night curtain rod is greater than the safety distance V;

[0013] If D1-C1≤E, then it is determined that the distance between the day curtain rod and the night curtain rod is equal to the safety distance V.

[0014] The day and night curtain operation method described above also includes a full opening operation where the night curtain lever moves to the upper limit N1 of the night curtain. After the night curtain is moved upward, the distance between the day curtain lever and the night curtain lever is determined.

[0015] If the distance between the day curtain rod and the night curtain rod is greater than the safety distance V, the day curtain rod will stop, and the night curtain rod will move in the direction of the day curtain rod until the distance between the day curtain rod and the night curtain rod is equal to the safety distance V. After the night curtain is moved upward again, the day curtain rod and the night curtain rod will move upward synchronously. The night curtain rod will eventually move to the upper limit position N1 of the night curtain, and the day curtain rod will eventually move to the upper limit position L1 of the day curtain.

[0016] If the distance between the day curtain rod and the night curtain rod is equal to the safety distance, the day curtain rod and the night curtain rod move upward synchronously. The night curtain rod eventually moves to the upper limit position N1 of the night curtain, and the day curtain rod eventually moves to the upper limit position L1 of the day curtain.

[0017] The day and night curtain operation method described above also includes a protective operation to prevent the day curtain rod and the night curtain rod from moving closer to each other. After operating the day curtain rod downward and the night curtain rod upward, the distance between the day curtain rod and the night curtain rod is determined.

[0018] If the distance between the day curtain rod and the night curtain rod is greater than the safe distance V, the day curtain rod and the night curtain rod will continue to operate.

[0019] If the distance between the day curtain rod and the night curtain rod is equal to the safety distance V, then the day curtain rod and the night curtain rod will stop simultaneously.

[0020] In the day and night curtain operation method described above, when determining the distance between the day curtain rod and the night curtain rod during the protection operation, the distance is determined based on the current position L of the day curtain rod. P Determine the travel distance D1 of the curtain rod;

[0021] If L P If the distance between the day curtain rod and the night curtain rod is less than or equal to L1-D1+E, then it is determined that the distance between them is equal to the safety distance V.

[0022] If L P If the distance between the day curtain rod and the night curtain rod is greater than the safety distance V, then it is determined that the distance between them is greater than the safety distance V.

[0023] In the day and night curtain operation method described above, when determining the distance between the day curtain rod and the night curtain rod during the protection operation, the distance is determined based on the current position N of the night curtain rod. P Determine the travel C1 of the sunshade rod;

[0024] If N P If the distance between the day curtain rod and the night curtain rod is equal to the safety distance V, then it is determined that the distance between them is equal to the safety distance V.

[0025] If N P If <N1-C1-E, then it is determined that the distance between the day curtain rod and the night curtain rod is greater than the safe distance V.

[0026] The present invention also provides a day / night curtain operating system, which can realize the above-mentioned day / night curtain operation method.

[0027] The present invention also provides a day and night curtain that can realize the above-mentioned day and night curtain operation method.

[0028] Implementing the embodiments of the present invention has the following beneficial effects:

[0029] This invention provides a method for operating day and night blinds. Unlike traditional methods that involve fully transmitting light as the day blind descends to its lower limit, this method first determines the distance between the current positions of the day blind and night blind rods before operation. Before the day blind rod reaches its lower limit, the distance between the two rods must be equal to a safety distance. Therefore, this method first moves the day blind rod closer to the night blind rod to ensure the safety distance is met before proceeding to the lower limit. Furthermore, by moving the day blind rod and night blind rod simultaneously downwards, the first and second suspension ropes of both rods remain taut, preventing slackness. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a day and night curtain according to the present invention;

[0032] Figure 2 Diagram showing the usage status of the day and night curtains;

[0033] Figure 3 for Figure 2 Attitude diagram of operating at a safe distance;

[0034] Figure 4 This is a schematic diagram of the fully transparent orientation;

[0035] Figure 5 This is a diagram showing the night curtain rod moving upwards to its upper limit (fully open position).

[0036] Figure 6 This is a schematic diagram showing the night curtain rod descending to its lower limit. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figures 1 to 3As shown, this embodiment of the invention provides a method for operating day and night curtains, including a full-light-transmitting operation where the day curtain descends to its lower limit L2. After the day curtain descends, the distance between the day curtain lever 2 and the night curtain lever 3 is determined: if the distance between the day curtain lever 2 and the night curtain lever 3 is greater than the safety distance V, then the night curtain lever 3 is stationary, and the day curtain lever 2 moves towards the night curtain lever 3, stopping when the distance between the day curtain lever 2 and the night curtain lever 3 is equal to the safety distance V. After the day curtain descends again, the day curtain lever 2 and the night curtain lever 3 descend synchronously, with the day curtain lever 2 eventually moving to the lower limit L2 and the night curtain lever 3 eventually moving to the lower limit N2. If the distance between the day curtain lever 2 and the night curtain lever 3 is equal to the safety distance V, the day curtain lever 2 and the night curtain lever 3 descend synchronously, with the day curtain lever 2 eventually moving to the lower limit L2 and the night curtain lever 3 eventually moving to the lower limit N2. This scheme differs from the traditional full-light-transmitting operation of the day curtain descending to its lower limit. First, it determines the distance between the current positions of the day curtain rod 2 and the night curtain rod 3 before operation. Before the day curtain rod 2 reaches its lower limit, the distance between the day curtain rod 2 and the night curtain rod 3 must be equal to the safety distance V. Therefore, this scheme first moves the day curtain rod closer to the night curtain rod to ensure the safety distance is met before proceeding to the lower limit. Furthermore, by moving the day curtain rod and the night curtain rod simultaneously downwards, it ensures that the first suspension rope of the day curtain rod and the second suspension rope of the night curtain rod remain taut, preventing slackness.

[0039] In this invention, the safety distance V refers to the distance between the day curtain rod 2 and the night curtain rod 3 when they are close to each other and the folded night curtain body is not squeezed. It is generally preset according to the material of the curtain body and the total length of the curtain body.

[0040] Therefore, in this scheme, the safety distance V = M + E; M is the distance between the upper limit L1 of the day curtain rod 2 and the upper limit N1 of the night curtain rod 3; E is a system-preset safety fixed value, where E > 0. When adjusting the stroke, since this scheme uses the upper limit obtained after the day curtain rod 2 and the night curtain rod 3 move upwards to an automatic stop, the distance between the upper limit L1 of the day curtain rod 2 and the upper limit N1 of the night curtain rod 3 at this time can be understood as the extreme position of the maximum compression of the night curtain body. The safety distance V of this scheme is based on this distance, with an additional preset safety fixed value E, so that the entire distance V satisfies the distance when the folded night curtain body is not compressed after the day curtain rod 2 and the night curtain rod 3 approach each other.

[0041] See also Figure 2 , Figure 3 , Figure 5The present invention also includes a full opening operation where the night curtain lever 3 moves to the upper limit position N1 of the night curtain. After the night curtain is moved upward, the distance between the day curtain lever 2 and the night curtain lever 3 is determined: if the distance between the day curtain lever 2 and the night curtain lever 3 is greater than the safety distance V, then the day curtain lever 2 is stationary, and the night curtain lever 3 moves towards the day curtain lever 2, stopping when the distance between the day curtain lever 2 and the night curtain lever 3 is equal to the safety distance V. After the night curtain is moved upward again, the day curtain lever 2 and the night curtain lever 3 move upward synchronously, and the night curtain lever 3 eventually moves to the upper limit position N1 of the night curtain, while the day curtain lever 2 eventually moves to the upper limit position L1 of the day curtain; if the distance between the day curtain lever 2 and the night curtain lever 3 is equal to the safety distance, the day curtain lever 2 and the night curtain lever 3 move upward synchronously, and the night curtain lever 3 eventually moves to the upper limit position N1 of the night curtain, while the day curtain lever 2 eventually moves to the upper limit position L1 of the day curtain. This scheme differs from the traditional method of fully opening the night curtain by moving it up to its upper limit. First, it determines the distance between the current positions of the day curtain rod 2 and the night curtain rod 3 before operation. Before the night curtain rod 3 reaches its upper limit, the distance between the day curtain rod 2 and the night curtain rod 3 must be equal to the safety distance V. Therefore, this scheme first moves the night curtain rod closer to the day curtain rod to ensure the safety distance is met before operating again to move the night curtain rod to its upper limit. Furthermore, by moving the day curtain rod and the night curtain rod synchronously upwards, it ensures that the first suspension rope of the day curtain rod and the second suspension rope of the night curtain rod remain taut, preventing slackness.

[0042] In this invention, when determining the distance between the day curtain rod 2 and the night curtain rod 3, the distance is determined based on the current position L of the day curtain rod 2. P The travel C1 of the day curtain rod is obtained from the upper limit L1 of the day curtain rod, and the current position N of the night curtain rod 3 is determined. P The travel distance D1 of the night curtain rod is obtained by comparing it with the upper limit setting N1. If D1 - C1 > E, it is determined that the distance between the day curtain rod 2 and the night curtain rod 3 is greater than the safety distance V; if D1 - C1 ≤ E, it is determined that the distance between the day curtain rod 2 and the night curtain rod 3 is equal to the safety distance V. Since the travel distances of the day curtain and the night curtain are the same after the upper limit setting is set, the distance between the day curtain rod 2 and the night curtain rod 3 is M. Therefore, this method only needs to compare the difference in travel distances between the two rods with the value E to determine the safety distance V.

[0043] See also Figures 2 to 3The present invention also includes a protective operation to prevent the day curtain rod 2 and the night curtain rod 3 from moving closer to each other. After the day curtain rod 2 moves downward and the night curtain rod 3 moves upward, the distance between the day curtain rod 2 and the night curtain rod 3 is determined: if the distance between the day curtain rod 2 and the night curtain rod 3 is greater than the safety distance V, then the day curtain rod 2 and the night curtain rod 3 continue to operate; if the distance between the day curtain rod 2 and the night curtain rod 3 is equal to the safety distance V, then the day curtain rod 2 and the night curtain rod 3 stop simultaneously. This design addresses a common issue in daily use: when a user activates the day blind rod 2 to move downwards while simultaneously activating the night blind rod 3 to move upwards, the night blind rod approaches the day blind rod. As the night blind rod continues to move upwards, it compresses the night blind curtain. When the day and night blinds compress the night blind curtain at a position other than the upper limit, the day blind rod is slightly lifted (due to the elasticity of the night blind curtain itself). This lifting causes the first hanging rope to loosen from its taut position. This design effectively protects against this operation, ensuring that both the day blind and night blind rods stop simultaneously at a safe distance, thus preventing the night blind curtain from being compressed.

[0044] Specifically, in this embodiment of the invention, when determining the distance between the daytime curtain rod 2 and the nighttime curtain rod 3 during the protection operation, the distance is determined based on the current position L of the daytime curtain rod 2. P Determine the travel distance D1 of the curtain rod; if L P If L ≤ L1 - D1 + E, then the distance between day curtain rod 2 and night curtain rod 3 is equal to the safety distance V; if L P If the distance between day curtain rod 2 and night curtain rod 3 is greater than the safety distance V, then it is determined that the distance between them is greater than the safety distance V.

[0045] Alternatively, the current position N of the night curtain rod 3 can be used. P Determine the travel C1 of the sunshade rod; if N P If the distance between day curtain rod 2 and night curtain rod 3 is equal to the safety distance V, then it is determined that the distance between them is equal to N1-C1-E; if N P If the distance between day curtain rod 2 and night curtain rod 3 is greater than the safety distance V, then the solution is considered to be satisfied by any one of these conditions.

[0046] like Figure 1 , Figure 5 , Figure 6As shown, in the above scheme, the upper limit of the day curtain rod and the lower limit of the night curtain rod are obtained when setting the day and night curtain travel. Specifically, the day and night curtain travel setting method is as follows: Step a, operate the day curtain rod 2 and the night curtain rod 3 to move upward and stop near the day and night curtain housing 1 to obtain the upper limit L1 of the day curtain rod 2 and the upper limit N1 of the night curtain rod 3; Step b, operate the night curtain rod 3 to move downward and stop at any position, save the current position of the night curtain rod 3 as the lower limit N2, and automatically obtain the lower limit L2 of the day curtain rod 2, thus completing the upper and lower travel setting of the day curtain rod 2 and the night curtain rod 3. It simplifies the cumbersome setup process by better adapting to users' daily use. Users only need to operate the night curtain upwards to complete the upper limit settings of both the day curtain and night curtain rods. Afterwards, users can control the downward position of the night curtain rod as needed to complete the lower limit setting. At the same time, this solution automatically obtains the lower limit of the day curtain rod based on the lower limit of the night curtain rod, thus completing the entire travel setting. Compared with the traditional method of setting two rods separately, this simplifies the setup operation and greatly improves efficiency.

[0047] In this invention, the upper limit positions of the day curtain rod 2 and the night curtain rod 3 are automatically obtained by the system based on the highest position that the day curtain rod 2 and the night curtain rod 3 can reach. Since the upper limit position determines the maximum opening degree of the day and night curtains in daily use, and the day and night curtains are often fully opened, the method makes the setting of the upper limit position automatically obtained by the system, so that the user does not need to set the day curtain rod 2 and the night curtain rod 3 separately, thereby simplifying the setting process of the travel.

[0048] In this embodiment of the invention, in step a, the day curtain rod 2 and the night curtain rod 3 move upwards towards the day / night curtain housing 1 and stop automatically upon impact. In the day / night curtain system, since the control of the day curtain rod 2 and the night curtain rod 3 are controlled by two separate sets of motors, when the first motor drives the day curtain rod 2 upwards, because there is a day curtain body between the day curtain rod 2 and the lower end of the day / night curtain housing 1, the day curtain body is compressed and folded when the day curtain rod 2 approaches the day / night curtain housing 1. This results in the day curtain rod 2 not contacting the day / night curtain housing 1, thus leaving a gap between them. This gap varies depending on the material and maximum length of the day curtain body. Similarly, the night curtain rod 3 also leaves a gap with the day curtain rod 2 due to the night curtain body. Therefore, in this solution, the system stops near the day / night curtain housing 1, obtaining the upper limit L1 of the day curtain rod 2 and the upper limit N1 of the night curtain rod 3. This represents the extreme position where the day curtain rod 2 reaches its compression limit, and the night curtain rod 3 reaches its compression limit. In the product, the final determination is made by the first and second motors. Therefore, the automatic stop here refers to the braking mechanism of the first motor caused by excessive reverse pulling force on the first motor when the day curtain rod 2 reaches its upper limit, resulting in overload protection. The same applies to the second motor.

[0049] In this embodiment of the invention, since the positions of the day curtain rod 2 and the night curtain rod 3 are arbitrary before entering the travel setting mode, for ease of operation, after entering the travel setting mode, in step a, when the night curtain rod 3 is moved upward, the day curtain rod 2 and the night curtain rod 3 move upward simultaneously. This eliminates the need for the user to separately operate the night curtain rod and the day curtain rod, making operation simpler.

[0050] In this embodiment of the invention, after setting the upper limit N1 and lower limit N2 of the night curtain rod 3, the total stroke D of the night curtain rod 3 is also obtained simultaneously, i.e., D = N1 - N2. In principle, the maximum stroke of the day curtain rod 2 is also the same as the total stroke of the night curtain rod 3. Therefore, this solution automatically obtains the lower limit of the day curtain rod 2 according to this logic. Specifically, in step b, the lower limit L2 of the day curtain rod 2 is automatically obtained based on the total stroke of the night curtain rod 3, i.e., L2 = L1 - (N1 - N2); where the total stroke of the night curtain rod 3 is the distance from the upper limit N1 to the lower limit N2 of the night curtain rod 3.

[0051] In this embodiment of the invention, after entering the travel setting mode, in step b, when the night curtain lever 3 is moved down, the day curtain lever 2 is in a stationary state. Therefore, this solution does not require the day curtain lever 2 to be moved down to the lower limit L2 of the day curtain to determine this. During the adjustment process, only the night curtain lever 3 needs to be moved. After the night curtain lever 3 is set to the lower limit N2, the lower limit L2 of the day curtain lever 2 is automatically obtained.

[0052] The present invention also provides a day and night curtain system, which can realize the above-described day and night curtain operation method.

[0053] The present invention also provides a day and night curtain that can realize the above-described day and night curtain operation method.

[0054] This invention provides a method for operating day and night blinds. Unlike traditional methods that involve fully transmitting light as the day blind descends to its lower limit, this method first determines the distance between the current positions of the day blind and night blind rods before operation. Before the day blind rod reaches its lower limit, the distance between the two rods must be equal to a safety distance. Therefore, this method first moves the day blind rod closer to the night blind rod to ensure the safety distance is met before proceeding to the lower limit. Furthermore, by moving the day blind rod and night blind rod simultaneously downwards, the first and second suspension ropes of both rods remain taut, preventing slackness.

[0055] It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0056] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method of operating a day / night shade, characterized by, The full light transmission operation includes the day curtain descending to the day curtain lower limit L2, after operating the day curtain descending, the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is determined: If the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is greater than the safety distance V, the night curtain pull rod (3) is static, the day curtain pull rod (2) moves to the direction of the night curtain pull rod (3), and stops when the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V, after operating the day curtain descending again, the day curtain pull rod (2) and the night curtain pull rod (3) descend synchronously, the day curtain pull rod (2) finally moves to the day curtain lower limit L2, and the night curtain pull rod (3) finally moves to the night curtain lower limit N2; If the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V, the day curtain pull rod (2) and the night curtain pull rod (3) descend synchronously, the day curtain pull rod (2) finally moves to the day curtain lower limit L2, and the night curtain pull rod (3) finally moves to the night curtain lower limit N2. The safety distance V=M+E; The M is the distance between the day curtain pull rod (2) upper limit L1 and the night curtain pull rod (3) upper limit N1; The E is a safety fixed value preset by the system, and E>0; When judging the distance between the day curtain pull rod (2) and the night curtain pull rod (3), according to the current position L of the day curtain pull rod (2) P And the upper limit L1 of the day curtain pull rod, the stroke C1 of the day curtain pull rod is obtained, according to the current position N of the night curtain pull rod (3) P And the upper limit N1 of the night curtain pull rod, the stroke D1 of the night curtain pull rod is obtained; If D1-C1>E, it is determined that the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is greater than the safety distance V; If D1-C1<=E, it is determined that the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V.

2. The method of claim 1, wherein, The full opening operation of the night curtain pull rod (3) moving to the night curtain upper limit N1 is further included, after operating the night curtain ascending, the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is determined: If the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is greater than the safety distance V, the day curtain pull rod (2) is static, the night curtain pull rod (3) moves to the direction of the day curtain pull rod (2), and stops when the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V, after operating the night curtain ascending again, the day curtain pull rod (2) and the night curtain pull rod (3) ascend synchronously, the night curtain pull rod (3) finally moves to the night curtain upper limit N1, and the day curtain pull rod (2) finally moves to the day curtain upper limit L1; If the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V, the day curtain pull rod (2) and the night curtain pull rod (3) ascend synchronously, the night curtain pull rod (3) finally moves to the night curtain upper limit N1, and the day curtain pull rod (2) finally moves to the day curtain upper limit L1.

3. The method of claim 1, wherein, The protection operation of the day curtain pull rod (2) and the night curtain pull rod (3) moving close to each other is further included, after operating the day curtain pull rod (2) descending and the night curtain pull rod (3) ascending, the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is determined: If the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is greater than the safety distance V, the day curtain pull rod (2) and the night curtain pull rod (3) continue to run; If the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V, the day curtain pull rod (2) and the night curtain pull rod (3) stop at the same time.

4. A method of operating a day and night blind according to claim 3, wherein, In the protection operation, when judging the distance between the day curtain pull rod (2) and the night curtain pull rod (3), according to the current position L of the day curtain pull rod (2) P The stroke D1 of the night curtain pull rod is judged. If L P ≤ L1 - D1 + E, it is judged that the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V. If L P > L1-D1+E, it is judged that the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is greater than the safety distance V.

5. The method of claim 3, wherein, In the protection operation, when judging the distance between the day curtain pull rod (2) and the night curtain pull rod (3), according to the current position N P of the night curtain pull rod (3), the stroke C1 of the day curtain pull rod is judged. If N P ≥ N1-C1-E, it is judged that the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is equal to the safety distance V. If N P If N1-C1-E, it is determined that the distance between the day curtain pull rod (2) and the night curtain pull rod (3) is greater than the safety distance V.

6. A day / night shade operating system characterized by, The system can realize the day and night curtain operation method in any one of claims 1-5.

7. A day and night blind characterized by The day-and-night curtain can realize the day-and-night curtain operation method as claimed in any one of claims 1-5.

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