Electric blinds

Abstract

To provide an electric blind in which a light leakage defect has been improved.SOLUTION: Movements of a front elevation cord, a rear elevation cord and a ladder cord 32 are controlled respectively and independently, and an angle adjustment motor controls one front meridian 32a and one rear meridian 32b of the ladder cord 32 to move them downwards and upwards respectively, driving slats to reverse them to a closed position. A second elevation motor 56 controls the rear elevation cord to move it upwards in accordance with the rear meridian, while the angle adjustment motor controls the front meridian 32a and rear meridian 32b of the ladder cord 32 to move them upwards and downwards respectively, driving the slats to reverse them to the closed position. The interlocking of the movements of the front elevation cord, the rear elevation cord and the ladder cord 32 is improved, the degree of closure between the slats is improved, and a bottom beam 10 is sufficiently reversed to a substantially vertical state so that it partially overlaps with the adjacent slat.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to blinds, and more particularly to an electric blind that can bring the slats into close contact with each other when the blind body is unfolded and the slats are inverted to a closed state. [Background technology]

[0002] As the name suggests, blinds have a plurality of horizontally arranged, elongated slats suspended between a head beam and a bottom beam by ladder cords. When using blinds, the lifting cord is pulled to move the bottom beam up and down horizontally, thereby expanding the slats at intervals from top to bottom or folding them up from bottom to top. However, according to the habits of most people, folding blinds is intended to allow light to pass through when open, and unfolding blinds is intended to block light. To achieve better light control when unfolding blinds, most people first lower the bottom beam to its lowest position and then operate the slat angle adjustment mechanism, thereby raising and lowering the two meridians of the ladder cord, respectively, to create a step between the front and rear of each slat, thereby adjusting the inclination angle of the slats and appropriately varying the amount of light passing through the blinds.

[0003] Conventional blinds use manual or electric controls to move the bottom beam up or down to unfold or collapse the blind body and raise or lower the two meridians of the ladder cord to change the inclination angle of the slats. However, because the opening and closing of the blind body and the control of the inclination angle of the slats are achieved by two independent mechanisms, the lifting and lowering of the lifting cord and the ladder cord meridians may not be synchronized. In this case, when adjusting the inclination angle of the slats to close them and completely block the passage of light, the closure between adjacent slats above and below is not achieved effectively, often resulting in light leakage. This light leakage is particularly noticeable in blinds with lifting cords located at the front and back.

[0004] For example, when the bottom beam of a blind is lowered to its lowest position, the lifting cord is fully extended to its maximum extension length. When a user operates the slat angle adjustment mechanism to raise and lower the two meridians of the ladder cord, the bottom beam corresponding to the rising meridian can move freely without being constrained by the lifting cord. However, the bottom beam corresponding to the descending meridian is constrained by the maximum extension length of the lifting cord and cannot lower its height to follow the descending meridian. This results in an insufficient height difference between the front and rear of the bottom beam. As a result, the slats located relatively higher are farther away from the influence of the bottom beam and can still flip to a nearly vertical position, allowing them to fit closely together and close completely. However, the closer the slats are to the bottom beam, the smaller the tilt angle of the slat becomes. This is especially true for the bottom beam, where only a slight change in tilt angle is typically allowed, resulting in light leakage. Furthermore, because the size and shape of the bottom beam are typically different from those of the slats and its weight is much greater than that of a single slat, when the user adjusts the tilt angle of the slats, the center of gravity of the bottom beam is misaligned with that of the multiple slats, making it difficult to synchronize and adjust the bottom beam and multiple slats to the same tilt angle.As mentioned above, light leakage caused by the bottom beam not closing properly with adjacent slats is an issue that needs to be addressed as soon as possible in conventional blind products. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, the object of the present invention is to provide an electric blind that improves the defect of light leakage by maintaining a good degree of closure between the slats and between the slats adjacent to the bottom beam when the blind body is unfolded and the slats are flipped to the closed state. [Means for solving the problem]

[0006] To achieve the above object, the present invention provides an electric blind including a head beam, a bottom beam, a plurality of slats, a first lifting motor, a second lifting motor, and an angle-adjusting motor, wherein the bottom beam is disposed below the head beam by being connected to a first winding shaft and a second winding shaft provided on the head beam via a front lifting cord and a rear lifting cord, respectively, the plurality of slats are suspended between the head beam and the bottom beam by ladder cords, and the ladder cords have front and rear meridians, one ends of which are connected to angle-adjusting wheels provided on the head beam, the plurality of slats are located between the front and rear meridians, the front meridians and the front lifting cord pass through one side of the slats, and the rear meridians and the rear lifting cord pass through the other side of the slats, a first lifting motor controls the rotation of the first winding shaft to wind up or release the front lifting cord, and a second lifting motor controls the rotation of the second winding shaft to wind up or release the rear lifting cord; an angle adjustment motor controls the rotation of the angle adjustment wheel to shift the front meridian and the rear meridian of the ladder cord up and down, thereby flipping the plurality of slats between a horizontal position and a closed position; When the front lifting cord and the rear lifting cord are wound up or released simultaneously, the bottom beam is driven to move between an upper limit position close to the head beam and a lower limit position away from the head beam, and when either the front meridian or the rear meridian moves upward and the multiple slats are flipped from the horizontal position to the closed position, either the front lifting cord or the rear lifting cord located on the same side of the multiple slats as the front meridian or the rear meridian moving upward also moves upward, thereby flipping the bottom beam in the same direction as the flipping direction of the multiple slats to a substantially vertical state and partially overlapping the adjacent slats.

[0007] In one embodiment, the electric blind includes a first detector for measuring the tension of the front lifting cord and a second detector for measuring the tension of the rear lifting cord, and if the tension measured by the first detector or the second detector is less than a predetermined value, a signal is emitted to cause the first lifting motor or the second lifting motor to stop controlling the rotation of the first winding shaft or the second winding shaft.

[0008] In one embodiment, the first detector and the second detector are provided on the head beam, the front lifting cord extends from the first winding shaft and passes through the first detector, and the rear lifting cord extends from the second winding shaft and passes through the second detector. [Effects of the Invention]

[0009] The effect of the present invention is that when the upward movement of the rear lifting cord is controlled to be equal to or greater than the upward movement of the rear meridian of the ladder cord, a good degree of closure can be maintained between the bottom beam and adjacent slats and between the slats themselves. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an electric blind according to one embodiment of the present invention in an expanded state. [Figure 2] FIG. 2 is a perspective view showing the folded state of the electric blind in FIG. [Figure 3] FIG. 2 is a side view of FIG. [Figure 4] 2 is a schematic diagram showing a cord control unit and a motor unit in the electric blind of FIG. 1. FIG. [Figure 5] 5 is a perspective view showing the cord control unit and the motor unit shown in FIG. 4 from a different angle. FIG. [Figure 6] 2 is a perspective view of the electric blind in FIG. 1 when the slats are closed. FIG. [Figure 7] FIG. 7 is a side view of FIG. 6. [Figure 8] 2 is a perspective view of the electric blind in FIG. 1 when the slats are closed. FIG. [Figure 9] FIG. 2 is a structural block diagram of an assembly electrically connected to the motorized blind in FIG. 1. [Figure 10] 2 is a perspective view showing a cord control unit and a detector in the electric blind of FIG. 1. FIG. [Figure 11] FIG. 11 is a front view of the member shown in FIG. [Figure 12] 2 is a flowchart showing an embodiment of a method for operating the electric blind in FIG. 1. [Figure 13] FIG. 10 is a perspective view showing a cord control unit and a detector in a motorized blind according to another preferred embodiment of the present invention. [Figure 14] FIG. 14 is a structural block diagram of an assembly electrically connected to the motorized blind in FIG. 13. [Figure 15A] 15 is a flowchart showing an embodiment of a method for operating the electric blind in FIG. 14. [Figure 15B] 15 is a flowchart showing an embodiment of a method for operating the electric blind in FIG. 14. [Figure 16] 15 is a flowchart showing another embodiment of a method for operating the electric blind in FIG. 14. [Figure 17] 15 is a flowchart showing yet another embodiment of a method for operating the electric blind in FIG. 14. [Figure 18] 15 is a flowchart showing another embodiment of a method for operating the electric blinds in FIG. 14. [Figure 19] 10 is a partially exploded schematic view of a motorized blind according to yet another preferred embodiment of the present invention; [Figure 20] 20 is a partially exploded schematic view showing the electric blind in FIG. 19 from another angle. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 to 3, an electric blind 100 according to one preferred embodiment of the present invention includes a head beam 10, a bottom beam 20, a plurality of long sheet-like slats 30, two cord control units 40, and a motor unit 50. The bottom beam 20 is suspended below the head beam 10 via two sets of lift cords arranged at the front and rear of the head beam 10. In other words, each set of lift cords includes a front lift cord 22 and a rear lift cord 24. The plurality of slats 30 are suspended between the head beam 10 and the bottom beam 20 via two ladder cords 32. The two cord control units 40 and the motor unit 50 are provided within the head beam 10, and the motor unit 50 is disposed between the two cord control units 40.

[0012] Here, the side corresponding to the position of the front lifting cord 22 of the electric blind 100 according to the present invention is defined as the "front side," and the side corresponding to the position of the rear lifting cord 24 is defined as the "rear side," and the "left side" and "right side" of the electric blind 100 refer to the state observed from the front side of the electric blind 100. This definition applies to all of the following explanations related to directions, so duplicate explanations will be omitted.

[0013] As shown in Figures 4 and 5, the head beam 10 is a U-shaped frame consisting of a bottom plate 12 and two front and rear side plates 14 connected to the bottom plate 12, of which the bottom plate 12 has two wire holes 12a and 12b on both the left and right sides that penetrate the top and bottom surfaces of the bottom plate 12, respectively, and the bottom surface of the bottom plate 12 is defined as forming a reference plane B (see Figure 3). The two cord control units 40 have the same structure and each include a first winding shaft 44, a second winding shaft 46, and an angle adjustment wheel 48 provided inside a housing 42. For convenience of explanation, the following description will be given taking the left cord control unit 40 as an example. One end of the front lifting cord 22 is connected to the first winding shaft 44, one end of the rear lifting cord 24 is connected to the second winding shaft 46, and the other ends of the front lifting cord 22 and the rear lifting cord 24 are respectively connected to the first winding shaft 44, ... second winding shaft 46. After extending downward and passing through the through holes 42a and 42b of the housing 42 and correspondingly through the wire holes 12a and 12b of the head beam 10, the front lifting cord 22 and the rear lifting cord 24 are further fixed to the bottom beam 20, and the front lifting cord 22 and the rear lifting cord 24 pass through the front and rear sides of the slats 30, respectively, with the front side of the slats 30 facing the indoor side and the rear side of the slats 30 facing the outdoor side.

[0014] The ladder cord 32 has a front meridian 32a and a rear meridian 32b that are arranged vertically when unfolded, and a plurality of latitude lines 32c that are arranged horizontally in the front-to-rear direction, of which one ends of the front meridian 32a and the rear meridian 32b are connected to the angle adjustment wheel 48, and the other ends extend downward to pass through the through holes 42a and 42b of the housing 42 and the corresponding wire holes 12a and 12b of the head beam 10, and then connected to the bottom beam 20. In another embodiment of the present invention, the front meridian 32a and the rear meridian 32b extend downward after passing through the wire holes 12a and 12b of the head beam 10, and then remain connected to the lowest slat of the plurality of slats 30, but are not connected to the bottom beam 20, and such a configuration is also feasible. As shown in FIG. 3, the front meridian 32a and the rear meridian 32b pass through the front and rear sides of the slats 30, respectively. That is, the slats 30 are located between the front meridian 32a and the rear meridian 32b. The front meridian 32a and the rear meridian 32b are connected to a plurality of loops (not shown) through which the front lifting cord 22 and the rear lifting cord 24 pass, respectively. The latitudes 32c are arranged at equal intervals, and both ends are connected to the front meridian 32a and the rear meridian 32b, respectively. Each latitude 32c supports one slat 30. It should be mentioned that when the front lifting cord 22, rear lifting cord 24, front meridian 32a and rear meridian 32b pass through the wire holes 12a and 12b of the head beam 10, they also pass through the reference plane B.

[0015] The motor unit 50 includes a first lifting motor 54, a second lifting motor 56, and an angle adjustment motor 58 arranged in a motor box 52, and the first lifting motor 54, the second lifting motor 56, and the angle adjustment motor 58 are each electrically connected to a controller 51. The first lifting motor 54 is a driving means for rotating a first shaft 54a inserted through the first winding shaft 44, and the first shaft 54a drives the first winding shaft 44 to rotate synchronously; the second lifting motor 56 is a driving means for rotating a second shaft 56a inserted through the second winding shaft 46, and the second shaft 56a drives the second winding shaft 46 to rotate synchronously; and the angle adjustment motor 58 is a driving means for rotating a third shaft 58a inserted through the angle adjustment wheel 48, and the third shaft 58a drives the angle adjustment wheel 48 to rotate synchronously.

[0016] 1 and 2, the controller 51 of the motor unit 50 controls the first lifting motor 54 and the second lifting motor 56 to rotate the first winding shaft 44 and the second winding shaft 46 in the forward or reverse direction, thereby winding up or releasing the front lifting cord 22 and the rear lifting cord 24, and further drives the bottom beam 20 to move between an upper limit position T1 close to the head beam 10 and a lower limit position T2 away from the head beam 10. The upper limit position T1 refers to the position of the bottom beam 20 when the slats 30 are folded from bottom to top as the bottom beam 20 rises in a horizontal state and the top slat 30 is close to the bottom of the head beam 10, and the lower limit position T2 refers to the position of the bottom beam 20 when the bottom beam 20 descends in a horizontal state and the slats 30 are deployed from top to bottom at intervals and the bottom beam 20 is in a horizontal state after the front lifting cord 22 and the rear lifting cord 24 have been released to a predetermined length. The predetermined length here is usually related to the height of the window frame and is generally a length that can cover almost the entire window.

[0017] When the controller 51 of the motor unit 50 controls the angle adjustment motor 58 to rotate the angle adjustment wheel 48, it can raise or lower the front meridian 32a and the rear meridian 32b, i.e., shift the front meridian 32a and the rear meridian 32b up and down, and drive the multiple slats 30 to flip between the horizontal position P1 and the closed position P2 or P2', and move the multiple slats 30 closer to each other. The horizontal position P1 means that the slats 30 are in a horizontal state (see Figure 1), and light can pass between adjacent slats 30. The closed position P2 or P2' means that the slats 30 are flipped in different directions to an approximately vertical state, so that the bottom part of the upper slat 30 overlaps the top part of the lower slat 30, blocking light transmission. The closed position P2 means that the front ends of the slats 30 are low and the rear ends are high (see Figures 6 and 7), and the closed position P2' means that the front ends of the slats 30 are high and the rear ends are low (see Figure 8). The overlapping includes both physical overlapping and visual overlapping. More specifically, the bottom of the upper slat 30 may be directly in contact with the top of the lower slat 30, or the bottom of the upper slat 30 may be merely adjacent to the top of the lower slat 30 without direct contact. In this case, when observed from the front or rear of the electric blind 100, the upper slat 30 partially shields or is partially shielded by the lower slat 30.

[0018] In another embodiment of the present invention, the arrangement of the lifting cords is the same as in the previous embodiment, but the arrangement of the meridians is different from that in the previous embodiment. More specifically, one end of the front lifting cord and one end of the rear lifting cord are connected to the first winding shaft and the second winding shaft on the head beam, respectively, and the other ends of the front lifting cord and the rear lifting cord are both connected to the bottom beam. One end of the front meridians and one end of the rear meridians are connected to the angle adjustment wheel on the head beam, and the other ends of the front meridians and the rear meridians pass through the front and rear sides of the plurality of slats, respectively, and are then connected to the lowest slat among the plurality of slats, rather than to the bottom beam as in the previous embodiment. The first winding shaft, the second winding shaft, and the angle adjustment wheel are controlled by the first lifting motor, the second lifting motor, and the angle adjustment motor, respectively. In the electric blind of the present invention, the front lifting cord, rear lifting cord and meridians are independently controlled by different motors, and the slats and bottom beam are independently driven by the ladder cord and lifting cord, respectively, so that the above-mentioned ladder cord and lifting cord arrangement can be applied and the problem in the prior art that the operation of the ladder cord meridians and the lifting cords is not synchronized, which affects the degree of closure of the blind, can be solved.

[0019] 1 to 3, when the electric blind 100 is fully deployed (i.e., the bottom beam 20 is at the lowest position T2) and the user wants to control the slats 30 to flip from the horizontal position P1 to the closed position P2 or P2' to effectively block light penetration into the room, the controller 51 activates the angle adjustment motor 58 and drives the angle adjustment wheel 48 to rotate in a predetermined rotation direction. In this embodiment, the predetermined rotation direction is a first direction. When the angle adjustment wheel 48 rotates in the first direction, a part of the front meridian 32a of the ladder cord 32 is released downward, and a part of the rear meridian 32b is wound up upward. Simultaneously with the rotation of the angle adjustment wheel 48, the controller 51 synchronously activates the second lifting motor 56 and controls the second winding shaft 46 to rotate, thereby winding up a part of the rear lifting cord 24.

[0020] It should be mentioned that in this embodiment, since the width of the bottom beam 20 in the front-rear direction is substantially the same as the width of each slat 30 in the front-rear direction, the rear lifting cord 24 is wound up so that the upward movement thereof is equal to or greater than the upward movement of the rear meridian 32b, where the upward movement refers to the amount by which the rear lifting cord 24 and the rear meridian 32b are pulled upward relative to the reference plane B, and preferably the upward movement of the rear lifting cord 24 is greater than the upward movement of the rear meridian 32b. The reason for this setting is that in actual use, if the upward movement of the rear lifting cord 24 is simply set equal to the upward movement of the rear meridian 32b, the center of gravity of the bottom beam 20 may not coincide with each slat 30, or the length of the front lifting cord 22 may be limited to a fixed value, which may prevent a sufficient inclination angle from being secured. In contrast, by setting the upward movement of the rear lifting cord 24 to be greater than the upward movement of the rear meridian 32b, the entire bottom beam 20 can be directly suspended and the center of gravity of the bottom beam 20 can be forcibly changed.This allows the bottom beam 20 to be placed in an almost upright position, close to or in contact with the bottom of the adjacent slat 30, and at the same time, when the bottom beam 20 is lifted and swings forward and downward, a pressing force is applied to one or more adjacent slats 30, thereby ensuring good spacing between the multiple slats 30 that are close to the bottom beam 20 (as shown in Figures 6 and 7), thereby improving the light leakage defect that exists in conventional structures.

[0021] However, the amount of upward movement of the rear lifting cord 24 can be set in various ways depending on the shape of the bottom beam and is not limited to the example given here. In another embodiment of the present invention, the width of the bottom beam in the front-to-rear direction is clearly smaller than the width of each slat 30 in the front-to-rear direction. In other words, the bottom beam has a slender and narrow shape and is narrower in the front-to-rear direction than each slat 30. In this way, the radius of rotation of the bottom beam is shorter than the radius of rotation of each slat 30 during the process of reversing from a horizontal state to a vertical state. Therefore, in this embodiment, by winding up the rear lifting cord 24 so that the amount of upward movement is smaller than the amount of upward movement of the rear meridian 32b, the bottom beam can be reversed approximately vertically and effectively closed to the slats 30. In other words, the electric blind 100 of the present invention uses the second lifting motor 56 to flexibly adjust the amount of upward movement of the rear lifting cord 24 according to the shape and design of the bottom beam, and can be set to be smaller, equal to, or larger than the amount of upward movement of the rear meridian 32b, thereby allowing the bottom beam and adjacent slats 30 to close together well.

[0022] In another embodiment of the present invention, when a user operates the angle adjustment motor 58 via the controller 51 to rotate in the first direction, the controller 51 not only controls the second lifting motor 56 to rotate the second winding shaft 46 to wind up a portion of the rear lifting cord 24 by operating the second lifting motor 56, but also controls the first lifting motor 54 to rotate the first winding shaft 44 by operating the first lifting motor 54 in synchronization with the second lifting motor 56, thereby releasing a portion of the front lifting cord 22. The downward movement of the front lifting cord 22 is set to be equal to or greater than the downward movement of the front meridian 32a, and the downward movement is the amount by which the front lifting cord 22 and the front meridian 32a are pulled downward relative to the reference plane B. As a result, the front side of the bottom beam 20 can be lowered in height in accordance with the descent of the front meridian 32a without being limited to the predetermined length to which the front lifting cord 22 is released, and preferably, the downward movement of the front lifting cord 22 is made greater than the downward movement of the front meridian 32a, thereby increasing the amount of inversion of the front side of the bottom beam 20, which can further promote the inclination of the slats 30 due to the inclination of the bottom beam 20, so that the bottom beam 20 reaches an inclination angle sufficient to be extremely close to or abut the adjacent slats 30 (as shown in Figures 6 and 7), thereby improving the light leakage defect present in the conventional structure.

[0023] In yet another embodiment of the present invention, the angle adjustment motor 58 is operated by the controller 51 to drive the angle adjustment wheel 48 to rotate in a predetermined rotation direction, which is a second direction. The rotation of the angle adjustment wheel 48 releases a portion of the rear meridian 32b of the ladder cord 32 downward, while simultaneously winding up a portion of the front meridian 32a. When the angle adjustment wheel 48 rotates, the controller 51 synchronously operates the first lifting motor 54 and controls the first winding shaft 44 to rotate, thereby winding up a portion of the front lifting cord 22. The upward movement of the front lifting cord 22 is set to be equal to or greater than the upward movement of the front meridian 32a, and the upward movement refers to the amount by which the front lifting cord 22 and the front meridian 32a are pulled upward relative to the reference plane B. Furthermore, the controller 51 also synchronously operates the second lifting motor 56 and controls the second winding shaft 46 to rotate, thereby releasing a portion of the rear lifting cord 24, and the downward movement of the rear lifting cord 24 is set to be equal to or greater than the downward movement of the rear meridian 32b, or set to be equal to the upward movement of the front lifting cord 22, where the downward movement refers to the amount of movement by which the rear lifting cord 24 and the rear meridian 32b are pulled downward relative to the reference plane B. This allows the bottom beam 20 to reach an inclination angle sufficient to bring it extremely close to or abut against the adjacent slat 30 (for example, as shown in FIG. 8), thereby improving the light leakage defect present in the conventional structure.

[0024] In the above-described embodiments, the predetermined rotation direction is described as either the first direction or the second direction. However, this is merely an example for the sake of convenience, and the first direction may be defined as the second direction opposite to the first direction, and the second direction may be defined as the first direction opposite to the second direction. Those skilled in the art will understand that when the predetermined rotation direction is different, the movement directions of the front meridian 32a, the rear meridian 32b, the front lifting cord 22, and the rear lifting cord 24 will be opposite to those described in the initial embodiment, but the definition of the movement amount of each meridian and lifting cord, and the resulting function of providing the bottom beam 20 with a sufficient inclination angle to properly close with the adjacent slat 30, remain the same.

[0025] It should be further explained that two sets of front lifting cords 22 and rear lifting cords 24 are provided to lift the bottom beam 20 in order to smoothly raise or lower the bottom beam 20. However, in other embodiments, as long as the requirement that the bottom beam 20 can be smoothly raised or lowered is satisfied, it is also possible to provide only one front lifting cord 22 and one rear lifting cord 24, for example, by providing the front lifting cord 22 on the left side and the rear lifting cord 24 on the right side.

[0026] In addition, the above-mentioned electric blind 100 is equipped with two cord control units 40, one on each side of the motor unit 50, and also has two sets of lifting cords for pulling the bottom beam 20.In addition to the above configuration, the electric blind 100 of the present invention can also expand the operating modes of the electric blind 100 by providing a first detector and a second detector at positions corresponding to each of the cord control units 40.

[0027] 5, 9, and 10, the electric blind 100 includes two first detectors 60a, 60b and two second detectors 70a, 70b (shown only in FIG. 9), which are mounted on the head beam 10 and electrically connected to the controller 51. The two first detectors 60a and 60b are provided corresponding to the left and right front lifting cords 22, respectively, and detect changes in tension of the left and right front lifting cords 22. The two second detectors 70a and 70b are provided corresponding to the left and right rear lifting cords 24, respectively, and detect changes in tension of the left and right rear lifting cords 24. With this configuration, in addition to controlling the folding and unfolding of the electric blinds 100 and changing the angle of the plurality of blinds 30 via the controller 51, the user can also control the folding and unfolding of the electric blinds 100 or change the angle of the blinds 30 by directly touching and operating the bottom beam 20 by lifting, flipping, or other means that change the tension of the lift cord.

[0028] In this embodiment, the first detectors 60a, 60b and the second detectors 70a, 70b are all microswitches electrically connected to the controller 51 and have the same structure. As shown in FIGS. 10 and 11 , the first detector 60a corresponding to the left front lift cord 22 includes a transmission member 62a, a pull ring 64a, a fixed contact 66a, and a spring 68a. The transmission member 62a has a first end and a corresponding second end, and a movable contact located at the first end. The second end of the transmission member 62a is used to connect to the pull ring 64a. The spring 68a provides a restoring force that biases the transmission member 62a in a direction from the second end toward the first end of the transmission member 62a. The front lift cord 22 is redirected after passing through the pull ring 64a in the first detector 60a. In a normal state, the front lift cord 22 is tensioned enough to maintain a balanced relationship with the pull ring 64a, allowing the transmission member 62a to resist the return force of the spring 68a, so that its movable contact does not contact the fixed contact 66a. When the front lift cord 22 goes from tensioned to slack, the return force of the spring 68a shifts the transmission member 62a, causing its movable contact to contact the fixed contact 66a, and a signal is sent from the first detector 60a to the controller 51. Similarly, the left rear lift cord 24 passes through the pull ring 74a in the corresponding second detector 70a, and in a normal state, the rear lift cord 24 is tensioned. When the rear lift cord 24 goes from tensioned to slack, the second detector 70a is activated and sends a signal to the controller 51.

[0029] FIG. 12 is a flowchart showing one embodiment of a method for operating the electric blind 100 shown in FIG. 1. Referring to FIG. 12, first, in step S11, the user controls the controller 51 to unfold the electric blind 100, thereby moving the bottom beam 20 downward toward the lowest position T2. ​​Then, in step S12, one of the left and right sides of the bottom beam 20 contacts an obstacle and stops moving downward, while the other side continues to move downward, resulting in the bottom beam 20 tilting asymmetrically. In step S13, when the front lifting cord 22 and / or the rear lifting cord 24 corresponding to the side of the bottom beam 20 obstructed by the obstacle loosens from a taut state and the tension weakens, at least one corresponding detector sends a signal to the controller 51. The detectors refer to first detectors 60a and 60b corresponding to the left and right front lifting cords 22, respectively, and second detectors 70a and 70b corresponding to the left and right rear lifting cords 24, respectively. In step S14, the controller 51 receives the at least one signal to control the first lifting motor 54 and the second lifting motor 56 to simultaneously stop the first winding shaft 44 and the second winding shaft 46 so that the bottom beam 20 does not continue to descend until the obstruction is removed.

[0030] Figure 13 is a perspective view showing the cord control unit and detectors of an electric blind according to another preferred embodiment of the present invention, and Figure 14 is a structural block diagram of the assembly components electrically connected to the electric blind. Referring to Figures 13 and 14, in this embodiment, the electric blind 100' also includes two first detectors 60a', 60b', respectively, corresponding to the two front lift cords 22 on the left and right sides, and two second detectors 70a', 70b', respectively, corresponding to the two rear lift cords 24 on the left and right sides. These are tension detectors electrically connected to the controller 51 and each equipped with a chip with computing capabilities. Other than that, the components and structure of the electric blind 100' are the same as those of the electric blind 100 shown in Figure 1, and therefore will not be described again.

[0031] 15A and 15B are flowcharts illustrating one embodiment of a method for operating the electric blind 100' in FIG. 14. Further referring to FIGS. 15A and 15B, first, in step S20, the user lifts the electric blind 100', which is stationary, upward while supporting its bottom beam 20 with their hands. Because the user does not intentionally center the bottom beam 20 during the lifting process, the front lifting cord 22 and the rear lifting cord 24 on the same side (left or right) will loosen from their taut state and become less taut, depending on the position and amount of force applied. For example, if the force is applied to the left side of the bottom beam 20, the left front lifting cord 22 and the rear lifting cord 24 will loosen from their taut state before the right front lifting cord 22 and the rear lifting cord 24. At this time, in step S21, the first detector 60a' detects a decrease in the tension of the left front lifting cord 22, and simultaneously determines that the tension value of the left front lifting cord 22 is less than a predetermined value, and after this determination result is maintained for a preset time or longer (e.g., 0.5 seconds), sends a signal to the controller 51. Almost simultaneously, the second detector 70a' also detects a decrease in the tension of the left rear lifting cord 24, and simultaneously determines that the tension value of the left rear lifting cord 24 is less than the predetermined value, and after this determination result is maintained for the preset time or longer, sends a signal to the controller 51.

[0032] On the other hand, if the force application position is biased to the right side of the bottom beam 20 in the previous step S20, in this step S21, another set of first detector 60b' and second detector 70b' respectively detects and determines that the tension values ​​of the corresponding right front lifting cord 22 and right rear lifting cord 24 are less than the predetermined value for a period longer than the predetermined time, and then transmits a signal to the controller 51. In this embodiment, neither of the above two situations affects the next step.

[0033] Next, in step S22, after the controller 51 simultaneously receives signals from the first detector 60a' and the second detector 70a' or simultaneously receives signals from the first detector 60b' and the second detector 70b', the controller 51 simultaneously operates the first lifting motor 54 and the second lifting motor 56 to drive the first winding shaft 44 and the second winding shaft 46 to rotate in the forward direction, winding up the two front lifting cords 22 and the two rear lifting cords 24, and raising the bottom beam 20. In step S23, when it is determined that the bottom beam 20 is about to reach the desired height, the bottom beam 20 is again lifted upward while being supported by hand. During the lifting process, the front lifting cord 22 and the rear lifting cord 24 located on the same side, either the left or right side, slacken from their taut state and the tension decreases depending on the position and amount of force applied.

[0034] Next, in step S24, if the position at which the force is applied to the bottom beam 20 is biased to the left in the previous step S23, the first detector 60a' and the second detector 70a' detect and determine that the tension values ​​of the corresponding left front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for the preset time or longer, they each send a signal to the controller 51. If the position at which the user's hand applies force to the bottom beam 20 is biased to the right in the previous step S23, another set of first detector 60b' and second detector 70b' determine that the tension values ​​of the corresponding right front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for the preset time or longer, they each send a signal to the controller 51. In this embodiment, neither of the above two situations affects the next step.

[0035] 15B , in step S25, after the controller 51 simultaneously receives signals from the first detector 60a' and the second detector 70a' or simultaneously receives signals from the first detector 60b' and the second detector 70b', the controller 51 controls the first lift-down motor 54 and the second lift-down motor 56 to stop the rotation of the first winding shaft 44 and the second winding shaft 46, respectively, and stops the movement of the bottom beam 20. At this time, the electric blind 100' comes to a standstill. In step S26, the bottom beam 20 of the electric blind 100' is manually lifted upward for the third time while the bottom beam 20 is being lifted. During the lifting process, the front lift-down cord 22 and the rear lift-down cord 24 located on the same side (either the left or right side) slacken from their taut state and the tension decreases depending on the position and amount of force applied.

[0036] In step S27, if the position where the user's hand applies force to the bottom beam 20 is shifted to the left in the previous step S26, the first detector 60a' and the second detector 70a' detect and determine that the tension values ​​of the corresponding left front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for the preset time or longer, they each send a signal to the controller 51. In the previous step S26, if the position where the user's hand applies force to the bottom beam 20 is shifted to the right, the first detector 60b' and the second detector 70b' determine that the tension values ​​of the corresponding right front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for the preset time or longer, they each send a signal to the controller 51. In this embodiment, neither of the above two situations affects the next step. In step S28, after the controller 51 simultaneously receives signals from the first detector 60a' and the second detector 70a', or simultaneously receives signals from the first detector 60b' and the second detector 70b', the controller 51 simultaneously activates the first lifting motor 54 and the second lifting motor 56 to drive the first winding shaft 44 and the second winding shaft 46, respectively, to rotate in opposite directions, thereby releasing the two front lifting cords 22 and the two rear lifting cords 24 and lowering the bottom beam 20.

[0037] In steps S22, S25, and S28, the controller 51 simultaneously receives signals from the left first detector 60 a' and the left second detector 70 a', or simultaneously receives signals from the right first detector 60 b' and the right second detector 70 b', and then controls the bottom beam 20 to sequentially perform the raising, stopping, and lowering operations, respectively. In another embodiment described below, the controller 51 simultaneously receives signals from the left first detector 60 a' and the left second detector 70 a', or simultaneously receives signals from the right first detector 60 b' and the right second detector 70 b', and then switches the operation of the bottom beam 20 between the raising and lowering operations.

[0038] Figure 16 is a flowchart showing another embodiment of the method for operating the electric blind 100' in Figure 14. Referring to Figure 16, first, in step S30, the user controls the folding of the electric blind 100' via the controller 51, thereby moving the bottom beam 20 upward toward the upper limit position T1. In step S31, the user lifts the electric blind 100' while supporting the bottom beam 20 with their hands while folding it up. During the lifting process, the front lifting cord 22 and the rear lifting cord 24 located on the same side, either the left or right side, slacken from their taut state and the tension decreases depending on the position and amount of force applied.

[0039] In step S32, if the position where the user's hand applies force to the bottom beam 20 is shifted to the left in the previous step S31, the first detector 60a' and the second detector 70a' substantially simultaneously detect and determine that the tension values ​​of the corresponding left front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for a preset time or longer (e.g., 0.5 seconds), they each send a signal to the controller 51. In the previous step S31, if the position where the user's hand applies force to the bottom beam 20 is shifted to the right, another pair of the first detector 60b' and the second detector 70b' detect and determine that the tension values ​​of the corresponding right front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for the preset time or longer, they each send a signal to the controller 51. In this embodiment, neither of the above two situations affects the next step.

[0040] Next, in step S33, after the controller 51 simultaneously receives signals from the first detector 60a' and the second detector 70a' or simultaneously receives signals from the first detector 60b' and the second detector 70b', the controller 51 controls the first lifting motor 54 and the second lifting motor 56 to change the rotation direction of the first winding shaft 44 and the second winding shaft 46, respectively, so that they rotate in the direction opposite to their original rotation direction. That is, the first winding shaft 44 and the second winding shaft 46 are switched from forward rotation to reverse rotation, the two front lifting cords 22 and the two rear lifting cords 24 are released, and the movement of the bottom beam 20 is changed from rising to falling.

[0041] Then, in step S34, the user lifts the bottom beam 20, which is in the process of lowering, of the electric blind 100' that is in the process of unfolding. During the lifting process, the bottom beam 20 remains approximately horizontal, and the front lifting cord 22 and the rear lifting cord 24 located on the same side (left or right) slacken from their taut state and become less tense, depending on the position and amount of force applied. In step S35, if the position where the user's hand applied force to the bottom beam 20 in the previous step S34 was biased to the left, the first detector 60a' and the second detector 70a' detect and determine that the tension value of the corresponding left front lifting cord 22 and rear lifting cord 24 is less than the predetermined value, and after this determination result is maintained for the preset time or longer, each detector sends a signal to the controller 51. In the previous step S34, if the position where the user's hand applies force to the bottom beam 20 is biased to the right, another set of first detector 60b' and second detector 70b' will detect and determine that the tension values ​​of the corresponding right front lifting cord 22 and rear lifting cord 24 are less than the predetermined value, and after this determination result is maintained for the preset time or longer, will send a signal to the controller 51. In this embodiment, neither of the above two situations will affect the next step.

[0042] In step S36, after the controller 51 simultaneously receives signals from the first detector 60a' and the second detector 70a' or simultaneously receives signals from the first detector 60b' and the second detector 70b', the controller 51 controls the first lifting motor 54 and the second lifting motor 56 to change the rotation direction of the first winding shaft 44 and the second winding shaft 46, respectively, to rotate them in the direction opposite to their original rotation direction. That is, the first winding shaft 44 and the second winding shaft 46 are switched from reverse rotation to forward rotation, and the two front lifting cords 22 and the two rear lifting cords 24 are wound up, thereby changing the operation of the bottom beam 20 from descending to ascending and lifting it to the upper limit position T1.

[0043] The above-described operation is merely an example. The first detectors 60a', 60b', the second detectors 70a', 70b', and the controller 51 can be used in combination to further design different operation modes as needed. For example, the number of times the bottom beam 20 is lifted (i.e., the number of times the front lifting cord 22 and the rear lifting cord 24 on the same side, either the left or right, become slack) can be set to be different, or the time the bottom beam 20 is lifted (i.e., the duration the front lifting cord 22 and the rear lifting cord 24 on the same side, either the left or right, become slack) can be set to be different, or By setting different delay times after the bottom beam 20 is lifted (i.e., the time from when it is detected that the front lifting cord 22 and the rear lifting cord 24 on the same side, either the left or right, have loosened to when the motors are actually controlled), the controller 51 can use this as a basis for sending different commands to the first lifting motor 54 and the second lifting motor 56, while also controlling the raising, lowering, stopping or moving to a specific position of the bottom beam 20 of the electric blind 100', thereby changing the shading range of the slats 30 between the head beam 10 and the bottom beam 20.

[0044] Furthermore, when the controller 51 simultaneously receives signals from the first detectors 60a', 60b' corresponding to the left and right front lifting cords 22 indicating that a decrease in tension has been detected in the front lifting cords 22, or simultaneously receives signals from the second detectors 70a', 70b' corresponding to the left and right rear lifting cords 24 indicating that a decrease in tension has been detected in the rear lifting cords 24, the controller 51 drives the angle adjustment motor 58 to rotate the angle adjustment wheel 48 in a specific direction, thereby flipping the slats 30 and adjusting the amount of light passing through between the slats 30. For detailed examples, please refer to the two embodiments below.

[0045] Fig. 17 is a flow chart showing another embodiment of the operating method for the electric blind 100' in Fig. 14. Please refer to Fig. 17. In this embodiment, the user can control the plurality of slats 30 to rotate at a preset angle each time (for example, but not limited to, 30 degrees or 40 degrees), and in a specific rotation step where the slats 30 are rotated to the closed state, the electric blind 100' automatically controls the lifting cord to be linked with the movement of the meridian, so as to ensure the closing effect between the bottom beam 20 and its adjacent slats 30.

[0046] In this embodiment, first, in step S41, the rear end of the bottom beam 20 is flipped upward, while the front end of the bottom beam 20 is flipped downward accordingly. The front lift cords 22 on both sides of the electric blind 100' are kept taut, maintaining their tension within a predetermined range, while the rear lift cords 24 on both sides are loosened, reducing their tension. In step S42, the second detectors 70a' and 70b' corresponding to the two rear lift cords 24 detect that the tension of the two rear lift cords 24 is less than the predetermined value, and transmit a signal to the controller 51. In step S43, after simultaneously receiving signals from the second detectors 70a' and 70b', the controller 51 determines whether the slats 30 have reached the closed state after flipping through the predetermined angle. If not, the process proceeds to step S44.

[0047] In step S44, the controller 51 sends a first reversal signal to the angle adjustment motor 58 after a preset time (e.g., 0.5 seconds) has elapsed. Then, in step S45, the angle adjustment motor 58 receives the first reversal signal and drives the angle adjustment wheel 48 to rotate in a first direction, thereby moving the front meridians 32a and the rear meridians 32b on both the left and right sides in opposite directions to shift them up and down, thereby reversing the plurality of slats 30 at the preset angle so that their rear ends face up and their front ends face down. Then, the process may return to step S41, where the rear ends of the bottom beam 20 are reversibly reversible upward to continue adjusting the inclination angles of the slats 30.

[0048] On the other hand, if the controller 51 determines in step S43 that the plurality of slats 30 have reached the closed state after reversing through the predetermined angle, the process proceeds to step S46. In step S46, the controller 51 transmits a first reversal signal to the angle adjustment motor 58 after the predetermined time has elapsed, and simultaneously transmits a first control signal and a second control signal to the first lift-down motor 54 and the second lift-down motor 56, respectively. Next, in step S47, the angle adjustment motor 58 receives the first reversal signal and drives the angle adjustment wheel 48 to rotate in the first direction, thereby moving the front meridians 32a and rear meridians 32b on both the left and right sides in opposite directions to shift them up and down, thereby reversing the plurality of slats 30 by the predetermined angle so that their rear ends face up and their front ends face down, thereby reversing the plurality of slats 30 to the closed state shown in FIG. 6 .

[0049] At the same time, in step S47, the first lifting motor 54 receives the first control signal and drives the first winding shaft 44 to rotate, thereby releasing the left and right front lifting cords 22, among which the left and right front lifting cords 22 move downward by the same amount, and the amount of downward movement of the left and right front lifting cords 22 is greater than the amount of downward movement of the left and right front meridians 32a. This prevents the bottom beam 20 from being limited by the length of the front lifting cords 22 and being unable to fully reverse in response to the descent of the front meridians 32a.

[0050] At the same time, in step S47, the second lifting motor 56 receives the second control signal and drives the second winding shaft 46 to rotate, thereby winding up the rear lifting cords 24 on both the left and right sides, among which the upward movement amount of the rear lifting cords 24 on both the left and right sides is the same, and the upward movement amount of the rear lifting cords 24 on both the left and right sides is at least equal to the upward movement amount of the rear meridians 32b on both the left and right sides, but preferably greater than the upward movement amount of the rear meridians 32b on both the left and right sides, thereby completely lifting the bottom beam 20 by the two rear lifting cords 24 and forcibly inverting it to an almost vertical state, thereby improving the problem of light leakage caused by insufficient closure between the bottom beam 20 and the adjacent slats 30.

[0051] The operating method of this embodiment can also be applied to the electric blind 100 shown in Figure 1, that is, it can be implemented using the first detectors 60a, 60b and the second detectors 70a, 70b that function as microswitches.

[0052] On the other hand, the user can also perform the same operation by flipping the bottom beam 20 in the other direction. Figure 18 is a flowchart showing another embodiment of the method for operating the electric blind 100' in Figure 14. Referring to Figure 18, first, in step S51, the front end of the bottom beam 20 is flipped upward, and at this time, the rear end of the bottom beam 20 is correspondingly flipped downward, so that the rear lifting cords 24 on both the left and right sides of the electric blind 100' are still taut and the tension can be kept within a predetermined range, but the front lifting cords 22 on both the left and right sides are slackened and the tension is reduced. In step S52, the first detectors 60a', 60b' corresponding to the two front lifting cords 22 determine whether the tension of the front lifting cords 22 on both the left and right sides corresponding to each other is less than a predetermined value, and if it is less than the predetermined value, proceed to the next step S53, and the first detectors 60a, 60b each send a signal to the controller 51 after a predetermined time (e.g., 0.5 seconds) has elapsed since the determination was made.

[0053] Next, in step S54, after simultaneously receiving the two signals, the controller 51 sends a second reversal signal to the angle adjustment motor 58, and at the same time, the controller 51 sends a first control signal and a second control signal to the first lifting motor 54 and the second lifting motor 56, respectively. In step S55, the angle adjustment motor 58 receives the second reversal signal and drives the angle adjustment wheel 48 to rotate in a second direction, thereby moving the front meridians 32a and the rear meridians 32b on each side in opposite directions to shift them up and down, and reversing the multiple slats 30 in a direction where their front ends face up and their rear ends face down to the closed state shown in FIG. At the same time, in step S55, the first lifting motor 54 receives the first control signal and drives the first winding shaft 44 to rotate, thereby winding up the front lifting cords 22 on both the left and right sides, among which the upward movement amounts of the front lifting cords 22 on both the left and right sides are the same, and the upward movement amounts of the front lifting cords 22 on both the left and right sides are at least equal to the upward movement amounts of the front meridians 32a on both the left and right sides, but preferably greater than the upward movement amounts of the front meridians 32a on both the left and right sides, thereby completely lifting the bottom beam 20 by the front lifting cords 22 and forcibly inverting it to an almost vertical state, thereby improving the problem of light leakage caused by insufficient closure between the bottom beam 20 and the adjacent slats 30.

[0054] At the same time, in step S55, the second lifting motor 56 receives the second control signal and drives the second take-up shaft 46 to rotate, thereby releasing the left and right rear lifting cords 24, but the downward movement amounts of the left and right rear lifting cords 24 are the same and are greater than the downward movement amounts of the left and right rear meridians 32b. In this way, it is possible to avoid the bottom beam 20 being limited by the length of the rear lifting cords 24 and being unable to fully reverse in response to the descent of the rear meridians 32b.

[0055] The above-described operation is merely an example, and different operation modes can be designed as needed by combining the first detectors 60a', 60b', the second detectors 70a', 70b' and the controller 51. For example, the bottom beam 20 may be set to have a different reversal angle, or the bottom beam 20 may be set to have a different reversal time (i.e., the duration during which both the left and right front lift cords 22 or both the left and right rear lift cords 24 are simultaneously in a slack state), or the delay time after the bottom beam 20 is reversed (i.e., the time from the time when it is detected that both the left and right front lift cords 22 or both the left and right rear lift cords 24 are slackened to the time when the motor actually starts rotating) may be set. By setting the time (time until control is performed) to be different, the controller 51 can issue different commands to the angle adjustment motor 58, the first lifting motor 54 and / or the second lifting motor 56, thereby controlling the electric blind 100' to flip the slats 30, and in a specific flipping step in which the multiple slats 30 are about to be flipped from the non-closed position to the closed position P2 or P2', the front lifting cords 22 on both the left and right sides or the rear lifting cords 24 on both the left and right sides are controlled to be wound up or released, thereby ensuring good closure between the bottom beam 20 and the adjacent slats 30.

[0056] Here, as a mode for controlling the reversal of the slats 30, as in the embodiment shown in Figure 18, the slats 30 can be directly reversed from the horizontal position P1 to the closed position P2 or P2', or conversely, reversed from the closed position P2 or P2' to the horizontal position P1.Furthermore, as in the embodiment shown in Figure 17, the reversal operation of each slat 30 from the horizontal position P1 to the closed position P2 or P2' can be carried out sequentially in multiple stages, and the reversal angle of the multiple slats 30 in each stage can be set to approximately the same value. Furthermore, in another embodiment of the present invention, the first detectors 60a', 60b' and the second detectors 70a', 70b', which have high measurement accuracy, are used to detect the tension data of the corresponding lifting cords, and the controller 51 is used to flip the slats 30 to one of the intermediate positions between the horizontal position P1 and the closed position P2 or P2' based on the measured data, so that the flip angle of the slats 30 and the flip angle of the bottom beam 20 have an equal and positive correlation, thereby more precisely adjusting the light transmittance of the electric blind 100'.

[0057] Furthermore, the motorized blind of the present invention does not necessarily have to be arranged with the motor unit 50 and cord control unit 40 as shown in Figure 4. The first lifting motor 54, second lifting motor 56, angle adjustment motor 58, and the lifting cord and ladder cord winding devices may be arranged on the head beam in different relative positions while maintaining the electrical connection relationship as shown in Figure 9.

[0058] 19 and 20, in yet another preferred embodiment of the present invention, an electric blind 110 includes, in addition to a head beam 10', a bottom beam (not shown), and a plurality of slats (not shown), a front lift cord electromechanical control unit 40', a ladder cord electromechanical control unit 50', and a rear lift cord electromechanical control unit 60', which are provided within the head beam 10'. Among them, the ladder cord electromechanical control unit 50' is located between the front lift cord electromechanical control unit 40' and the rear lift cord electromechanical control unit 60'. The head beam 10' is provided with two wire holes 12a' and 12b' on both the left and right sides, which respectively penetrate the top and bottom surfaces of the bottom plate 12'.

[0059] 19 and 20, the front lifting cord electromechanical control unit 40' includes a first lifting motor 41 and a first upright winding shaft 43, which are connected to each other by a gear transmission mechanism (only a portion of the spur gear that meshes with the toothed disk at the upper end of the first winding shaft 43 is shown) provided within a first shell 45. One end of the right front lifting cord 22 is fixed to and wound around the upper of the two grooves in the first winding shaft 43, and the other end extends downward into a right third shell 57, passes through a through-hole 57a therein, and then passes through a wire hole 12a' adjacent to the right side of the head beam 10' before being fixed to the bottom beam (not shown). At the same time, one end of the left front lifting cord 22 is fixed and wound in the lower of the two grooves of the first winding shaft 43, and the other end extends downward and passes through the through-hole 57a of the left third shell 57 and the wire hole 12a' adjacent to the left side of the head beam 10' before being fixed to the bottom beam (not shown). The first lifting motor 41 drives the first winding shaft 43 to rotate about its vertical axis via the gear transmission mechanism, thereby synchronously winding up the left and right front lifting cords 22 or synchronously releasing the left and right front lifting cords 22.

[0060] Similarly, the rear lifting cord electromechanical control unit 60' includes a second lifting motor 61 and a second upright winding shaft 63, which are connected to each other by a gear transmission mechanism (only a portion of the spur gear that meshes with the toothed disk at the upper end of the second winding shaft 63 is shown) provided within a second shell 65. One end of the left rear lifting cord 24 is fixed to and wound around the upper of the two grooves in the second winding shaft 63, and the other end extends downward into the left third shell 57, passes through a through-hole 57b therein, and then passes through one wire hole 12b' adjacent to the left side of the head beam 10', before being fixed to the bottom beam (not shown). One end of the right rear lifting cord 24 is fixed and wound in the lower of the two grooves of the second winding shaft 63, and the other end extends downward and passes through the through-hole 57b of the right third shell 57 and the wire hole 12b' adjacent to the right side of the head beam 10' before being fixed to the bottom beam (not shown). The second lifting motor 61 drives the second winding shaft 63 to rotate about a vertical axis via the gear transmission mechanism, thereby synchronously winding up both the left and right rear lifting cords 24 or synchronously releasing both the left and right rear lifting cords 24.

[0061] The ladder cord electromechanical control unit 50' includes an angle adjustment motor 55 and two angle adjustment wheels 59. The angle adjustment motor 55 is mounted in a motor box 53, and the two angle adjustment wheels 59 are mounted in two third shells 57 on the left and right sides, respectively. The angle adjustment motor 55 drives two shafts 55a and 55b that penetrate the two angle adjustment wheels 59. When the two shafts 55a and 55b rotate, the two angle adjustment wheels 59 rotate synchronously, causing one of the front meridians 32a and the rear meridians 32b of each ladder cord 32 to move upward and the other to move downward. The electric blind 110 of this embodiment is also provided with two first detectors 71a and 71b corresponding to the front lift cords 22 on the left and right sides, and two second detectors 81a and 81b corresponding to the rear lift cords 24 on the left and right sides. Among them, the first detector 71a and the second detector 81a are provided on the head beam 10' adjacent to the left third shell 57, and the first detector 71b and the second detector 81b are provided on the head beam 10' adjacent to the right third shell 57. With this configuration, the electric blind 110 of this embodiment can be operated in all the same ways as the electric blind 100 described above.

[0062] In summary, the motorized blinds 100, 100', and 110 of the present invention can adjust the movement of the front lift cords 22 on both sides and the rear lift cords 24 on both sides via the first lift motors 54, 41 and the second lift motors 56, 61, respectively. This allows the angle-adjusting motors 55, 58 to release or reel in the front meridians 32a and rear meridians 32b according to the size and shape of the bottom beam 20. This allows the bottom beam 20 to be extremely close to or abut the adjacent slats 30 when the motorized blinds 100, 100', and 110 are closed, significantly reducing the problem of poor closing caused by misalignment of the lift cords and the meridians. Furthermore, by providing a detector for detecting tension changes in each lift cord, the motorized blinds 100, 100', and 110 of the present invention can be operated by directly touching the bottom beam 20 in addition to being controlled by the controller 51, providing consumers with an innovative and convenient user experience.

[0063] The above are merely preferred embodiments that can realize the present invention, and equivalent modifications made without departing from the scope of the specification and claims of the present invention should be included in the scope of the claims of the present invention. [Explanation of symbols]

[0064] 100, 100', 110: Electric blinds 10,10': Head beam 12,12': Bottom plate 12a,12a': Wire hole 12b,12b': Wire hole 14: Side plate 20: Bottom beam 22: Front lift cord 24: Rear lift cord 30: Slat 32: Ladder cord 32a: anterior meridian 32b: Posterior meridian 32c: Parallel 40: Code control unit 40': Front lift cord electromechanical control unit 41, 54: First lift motor 42: Cabinet 42a: Through hole 42b: Through hole 43, 44: First winding shaft 46,63: Second winding shaft 45: First shell 48,59: Angle adjustment wheel 50: Motor unit 50': Ladder code electromechanical control unit 51: Controller 52, 53: Motor box 54a: First shaft 55,58: Angle adjustment motor 55a, 55b: Axis rod 56, 61: Second lift motor 56a: Second shaft 57: Third Shell 57a, 57b: Through hole 58a: Third shaft 60': Rear lift cord electromechanical control unit 60a, 60b, 60a', 60b', 71a, 71b: first detector 62a: Transmission member 64a, 74a: Pull ring 65: Second shell 66a: Fixed contact 68a:Spring 70a, 70b, 70a', 70b', 81a, 81b: second detector B: Reference plane P1: Horizontal position P2,P2': Closed position T1: Upper limit position T2: Lower limit position

Claims

1. An electric blind comprising a head beam, a bottom beam, a plurality of slats, a first lifting motor, a second lifting motor, and an angle adjustment motor, The bottom beam is disposed below the head beam by being connected to a first winding shaft and a second winding shaft provided on the head beam via a front lifting cord and a rear lifting cord, respectively; the plurality of slats are suspended between the head beam and the bottom beam by ladder cords, and the ladder cords have front meridians and rear meridians, one end of each of the front meridians and the rear meridians is connected to an angle adjustment wheel provided on the head beam; the plurality of slats are located between the front meridians and the rear meridians, the front meridians and the front lifting cord pass through one side of the slats, and the rear meridians and the rear lifting cord pass through the other side of the slats; the first lifting motor controls the rotation of the first winding shaft to wind up or release the front lifting cord; the second lifting motor controls the rotation of the second winding shaft to wind up or release the rear lifting cord; The angle adjustment motor controls the rotation of the angle adjustment wheel to shift the front meridian and the rear meridian of the ladder cord up and down, thereby flipping the plurality of slats between a horizontal position and a closed position; When the front lifting cord and the rear lifting cord are wound up or released simultaneously, the bottom beam is driven to move between an upper limit position close to the head beam and a lower limit position away from the head beam, and when either the front meridian or the rear meridian moves upward and the plurality of slats are flipped from the horizontal position to the closed position, either the front lifting cord or the rear lifting cord, which is located on the same side of the plurality of slats as the front meridian or the rear meridian that is moving upward, also moves upward, thereby flipping the bottom beam in the same direction as the flipping direction of the plurality of slats to a substantially vertical state and so as to partially overlap the adjacent slats.

2. the head beam has a reference plane through which the front lifting cord, the rear lifting cord, the front meridian, and the rear meridian pass; When the front lifting cord moves upward, the amount of upward movement of the front lifting cord is greater than the amount of upward movement of the front meridian, and when the rear lifting cord moves upward, the amount of upward movement of the rear lifting cord is greater than the amount of upward movement of the rear meridian, The electric blind according to claim 1 , wherein the upward movement amount is defined as the amount by which the front lift cord, the rear lift cord, the front meridian, and the rear meridian are pulled upward relative to the reference plane.

3. the head beam has a reference plane through which the front lifting cord, the rear lifting cord, the front meridian, and the rear meridian pass; When the front lifting cord moves upward, the amount of upward movement of the front lifting cord is approximately equal to the amount of upward movement of the front meridian, and when the rear lifting cord moves upward, the amount of upward movement of the rear lifting cord is approximately equal to the amount of upward movement of the rear meridian, The electric blind according to claim 1 , wherein the upward movement amount is defined as the amount by which the front lift cord, the rear lift cord, the front meridian, and the rear meridian are pulled upward relative to the reference plane.

4. the head beam has a reference plane through which the front lifting cord, the rear lifting cord, the front meridian, and the rear meridian pass; When the front lifting cord moves upward, the amount of upward movement of the front lifting cord is smaller than the amount of upward movement of the front meridian, and when the rear lifting cord moves upward, the amount of upward movement of the rear lifting cord is smaller than the amount of upward movement of the rear meridian, The electric blind according to claim 1 , wherein the upward movement amount is defined as the amount by which the front lift cord, the rear lift cord, the front meridian, and the rear meridian are pulled upward relative to the reference plane.

5. the head beam has a reference plane through which the front lifting cord, the rear lifting cord, the front meridian, and the rear meridian pass; When the plurality of slats are flipped from the horizontal position to the closed position, one of the front lifting cord and the rear lifting cord moves upward while the other moves downward, and when the front lifting cord moves downward, the downward movement amount of the front lifting cord is approximately equal to the downward movement amount of the front meridian, and when the rear lifting cord moves downward, the downward movement amount of the rear lifting cord is approximately equal to the downward movement amount of the rear meridian, The motorized blind of claim 1 , wherein the downward movement is defined as the amount of movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian pulled downward relative to the reference plane.

6. 10. The motorized blind of claim 1, further comprising a first detector for detecting tension in the front lift cord and a second detector for detecting tension in the rear lift cord.

7. 7. The electric blind according to claim 6, wherein the first lift motor and the second lift motor drive the first winding shaft and the second winding shaft to rotate, respectively, and when the tension detected by at least one of the first detector and the second detector is less than a predetermined value, a first control signal and a second control signal are sent to the first lift motor and the second lift motor, respectively, thereby causing the first lift motor and the second lift motor to stop the rotation of the first winding shaft and the second winding shaft.

8. 7. The electric blind according to claim 6, wherein, when the first winding shaft and the second winding shaft are stationary and the tensions detected by the first detector and the second detector are both less than a predetermined value, a first control signal and a second control signal are sent to the first lift motor and the second lift motor, respectively, and the first lift motor and the second lift motor control the rotation of the first winding shaft and the second winding shaft, thereby simultaneously releasing the front lift cord and the rear lift cord or simultaneously winding up the front lift cord and the rear lift cord.

9. 7. The electric blind according to claim 6, wherein, when the tension detected by only the second detector of the first and second detectors is less than a predetermined value, a first reversal signal is transmitted to drive the angle adjustment motor to rotate the angle adjustment wheel in a first direction, thereby releasing the front meridian and winding up the rear meridian; and when the tension detected by only the first detector of the first and second detectors is less than a predetermined value, a second reversal signal is transmitted to drive the angle adjustment motor to rotate the angle adjustment wheel in a second direction, thereby winding up the front meridian and releasing the rear meridian.

10. 7. The electric blind of claim 6, wherein the first detector and the second detector are provided on the head beam, the front lifting cord extends from the first winding shaft and passes through the first detector, and the rear lifting cord extends from the second winding shaft and passes through the second detector.

11. An electric blind comprising a head beam, a bottom beam, a plurality of slats, a first lifting motor, a second lifting motor, an angle adjustment motor, a first detector, a second detector, and a controller, The bottom beam is disposed below the head beam by being connected to a first winding shaft and a second winding shaft provided on the head beam via a front lifting cord and a rear lifting cord, respectively; the plurality of slats are suspended between the head beam and the bottom beam by ladder cords, and the ladder cords have front meridians and rear meridians, one end of each of the front meridians and the rear meridians is connected to an angle adjustment wheel provided on the head beam; the plurality of slats are located between the front meridians and the rear meridians, the front meridians and the front lifting cord pass through one side of the slats, and the rear meridians and the rear lifting cord pass through the other side of the slats; the first lifting motor controls the rotation of the first winding shaft to wind up or release the front lifting cord; the second lifting motor controls the rotation of the second winding shaft to wind up or release the rear lifting cord; The angle adjustment motor controls the rotation of the angle adjustment wheel to shift the front meridian and the rear meridian of the ladder cord up and down, thereby flipping the plurality of slats between a horizontal position and a closed position; the first detector is used to detect tension of the front lift cord; the second detector is used to detect tension of the rear lift cord; the controller is electrically connected to the first lift motor, the second lift motor, and the angle adjustment motor; When the first winding shaft and the second winding shaft are stationary and only the tension detected by the second detector of the first detector and the second detector is less than a predetermined value, the controller issues a first reversal signal to control the angle adjustment motor to rotate the angle adjustment wheel in a first direction, thereby moving the rear meridian upward relative to the front meridian to reverse the multiple slats; When the first winding shaft and the second winding shaft are stationary and only the tension detected by the first detector of the first detector and the second detector is less than the predetermined value, the controller issues a second reversal signal to control the angle adjustment motor to rotate the angle adjustment wheel in a second direction, thereby moving the front meridian upward relative to the rear meridian to reverse the plurality of slats; Any one or two of the following situations occurs: When the controller transmits the first reversal signal, the angle adjustment motor controls the angle adjustment wheel to reverse the plurality of slats to the closed position, and the controller further controls the second lifting motor to rotate the second winding shaft to wind up the rear lifting cord, so that the bottom beam is reversed to a substantially vertical state in the same direction as the reversal direction of the plurality of slats and partially overlaps the adjacent slats; and / or When the controller transmits the second reversal signal, the angle adjustment motor controls the angle adjustment wheel to reverse the plurality of slats to the closed position, and the controller further controls the first lifting motor to rotate the first winding shaft to wind up the front lifting cord, thereby reversing the bottom beam to a substantially vertical position in the same direction as the reversal direction of the plurality of slats and so as to partially overlap adjacent slats.

12. the head beam has a reference plane through which the front lifting cord, the rear lifting cord, the front meridian, and the rear meridian pass; when the controller controls the angle adjustment motor to rotate the angle adjustment wheel in the first direction and the second lifting motor to rotate the second winding shaft to wind up the rear lifting cord, an upward movement amount of the rear lifting cord is greater than an upward movement amount of the rear meridian, when the controller controls the angle adjustment motor to rotate the angle adjustment wheel in the second direction and the first lifting motor to rotate the first winding shaft to wind up the front lifting cord, an upward movement amount of the front lifting cord is greater than an upward movement amount of the front meridian, The motorized blind according to claim 11, wherein the upward movement is defined as the amount of movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian upward relative to the reference plane.

13. When the first winding shaft and the second winding shaft are stationary and the tension detected by the second detector is less than the predetermined value, the controller further controls the first lifting motor to rotate the first winding shaft, thereby releasing the front lifting cord; 12. The electric blind according to claim 11, wherein when the first winding shaft and the second winding shaft are stationary and the tension detected by the first detector is less than the predetermined value, the controller further controls the second lift motor to rotate the second winding shaft, thereby releasing the rear lift cord.

14. the head beam has a reference plane through which the front lifting cord, the rear lifting cord, the front meridian, and the rear meridian pass; when the controller controls the angle adjustment motor to rotate the angle adjustment wheel in the first direction and simultaneously controls the first lifting motor to rotate the first winding shaft to release the front lifting cord, a downward movement amount of the front lifting cord is greater than a downward movement amount of the front meridian, when the controller controls the angle adjustment motor to rotate the angle adjustment wheel in the second direction and simultaneously controls the second lifting motor to rotate the second winding shaft to release the rear lifting cord, a downward movement amount of the rear lifting cord is greater than a downward movement amount of the rear meridian, The motorized blind of claim 13, wherein the downward movement is defined as the amount of movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian pulled downward relative to the reference plane.

15. 12. The electric blind according to claim 11, wherein, when both the tensions detected by the first detector and the second detector are less than a predetermined value, the controller controls the first lift motor and the second lift motor to drive the first winding shaft and the second winding shaft to rotate in a forward direction or a reverse direction, respectively, thereby simultaneously releasing or winding up the front lifting cord and the rear lifting cord, or the controller controls the first lift motor and the second lift motor to stop the rotation of the first winding shaft and the second winding shaft, respectively, thereby stopping the moving front lifting cord and the moving rear lifting cord.

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