Electric blind

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 capable of bringing 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 number of horizontally arranged long slats on the blind body, and the slats are suspended between a head beam and a bottom beam by a ladder cord. When using blinds, the lifting cord is pulled to move the bottom beam up and down in a horizontal state, thereby achieving the purpose of deploying the slats from top to bottom at intervals or folding them up from bottom to top. However, according to the habits of most people when using blinds, the purpose of folding the blind body is to let light through when it is open, and the purpose of deploying the blind body is to block light. In order to achieve a better light adjustment effect when deploying the blind body, in many cases, the bottom beam is hung at the lowest position and then the slat angle adjustment mechanism is operated to raise and lower the two meridians of the ladder cord respectively, thereby creating a step at the front and rear heights of each slat, and the inclination angle of the slats is adjusted to achieve the purpose of appropriately changing the amount of light transmitted through the blind body.

[0003] In conventional blinds, the lifting cord is operated manually or electrically to move the bottom beam upward or downward to unfold or fold the blind body, and to raise and lower the two meridians of the ladder cord, respectively, to change the inclination angle of the slats. However, since 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 cord and the meridians of the ladder cord may not rise and fall in sync. In this case, when adjusting the inclination angle of the slats to close the slats and completely block the passage of light, a good closing effect cannot be achieved between the adjacent slats on the top and bottom, and light leakage often occurs. Such light leakage is particularly noticeable in blinds with lifting cords arranged in the front and back.

[0004] For example, when the bottom beam of the blind is lowered to the lowest position, the lifting cord is fully extended to its maximum extension length. At this time, when the user operates the slat angle adjustment mechanism to raise and lower the two meridians of the ladder cord, the bottom beam side corresponding to the ascending meridian can move freely without being constrained by the lifting cord, but the bottom beam side 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, resulting in insufficient height difference between the front and rear sides of the bottom beam. As a result, the slats that are relatively higher are far from the influence of the bottom beam, so they can still be inverted to a nearly vertical state and can be completely closed by being in close contact with the adjacent slats, but the closer they are to the bottom beam, the smaller the inclination angle of the slat becomes noticeable, and especially since the bottom beam generally only has a slight change in inclination angle, light leakage occurs. In addition, since the size and shape of the bottom beam are usually different from those of the slats and the weight is much greater than that of a single slat, when a user adjusts the inclination angle of the slats, it is difficult to synchronize and adjust the bottom beam and multiple slats to the same inclination angle due to the misalignment of the center of gravity of the bottom beam and multiple slats. As mentioned above, light leakage caused by the bottom beam not closing well with the adjacent slats is an issue that needs to be improved as soon as possible for 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 which improves the defect of light leakage by maintaining a good degree of closure between the slats and between the bottom beam and adjacent slats when the blind body is unfolded and the slats are inverted to the closed state. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides 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, 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 a ladder cord, and the ladder cord has a front meridian and a rear meridian, one end of the front meridian and the rear meridian are connected to an angle adjustment wheel provided on the head beam, the plurality of slats are located between the front meridian and the rear meridian, wherein the front meridian and the front lifting cord pass through one side of the slats, and the rear meridian 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; 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 inverting 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 which is located on the same side of the multiple slats as the upward moving front meridian or the rear meridian 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 motorized blind includes a first detector for measuring the tension of the front lift cord and a second detector for measuring the tension of the rear lift cord, and if the tension measured by the first detector or the second detector is less than a predetermined value, a signal is generated to cause the first lift motor or the second lift 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. Effect 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 greater than or equal to 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 description 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. [Diagram 2] FIG. 2 is a perspective view showing the folded state of the electric blind in FIG. [Diagram 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. [Diagram 5] 5 is a perspective view showing the cord control unit and the motor unit shown in FIG. 4 from a different angle. [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] FIG. 2 is a perspective view showing a cord control unit and a detector in the motorized blind of FIG. 1. [Figure 11] FIG. 11 is a front view of the member shown in FIG. [Figure 12] 2 is a flow chart showing an embodiment of a method for operating the electric blind in FIG. 1. [Figure 13] FIG. 2 is a perspective view showing a code 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 flow chart showing an embodiment of a method for operating the electric blind in FIG. 14. [Figure 15B] 15 is a flow chart showing an embodiment of a method for operating the electric blind in FIG. 14. [Figure 16] 15 is a flow chart showing another embodiment of a method for operating the motorized blind in FIG. 14. [Figure 17] 15 is a flow chart showing yet another embodiment of a method for operating the motorized blind in FIG. 14. [Figure 18] 15 is a flow chart showing another embodiment of a method for operating the motorized blind in FIG. 14. [Figure 19] FIG. 13 is a partially exploded schematic diagram 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 motorized blind in FIG. 19 from another angle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 1 to 3, an electric blind 100 according to a 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, among which the bottom beam 20 is suspended below the head beam 10 via two sets of lifting cords arranged in front and rear, in other words, each set of lifting cords includes a front lifting cord 22 and a rear lifting 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 in 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 motorized 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 motorized blind 100 refer to the state observed from the front side of the motorized 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, in which one end of the front lift cord 22 is connected to the first winding shaft 44, one end of the rear lift cord 24 is connected to the second winding shaft 46, and the other ends of the front lift cord 22 and the rear lift cord 24 are connected to the first winding shaft 44, the second winding shaft 46, and the third winding shaft 48, respectively. 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, of which the front side of the slats 30 faces the indoor side and the rear side of the slats 30 faces the outdoor side.

[0014] The ladder cord 32 includes a front meridian 32a and a rear meridian 32b arranged vertically when deployed, and a plurality of latitude lines 32c arranged horizontally from front to back, of which one end of the front meridian 32a and the rear meridian 32b are connected to the angle adjustment wheel 48, and the other end extends downward and passes through the through holes 42a and 42b of the housing 42, and then passes through the wire holes 12a and 12b of the head beam 10 correspondingly, before being 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 are connected to the slat at the bottom end of the plurality of slats 30, and are not connected to the bottom beam 20, and such a configuration is also possible. 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, and each latitude 32c supports one slat 30. Let me say this for clarity. When the front lifting cord 22, the rear lifting cord 24, the front meridian 32a and the 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 lift motor 54, a second lift motor 56, and an angle adjustment motor 58 arranged in a motor box 52, and the first lift motor 54, the second lift motor 56, and the angle adjustment motor 58 are each electrically connected to a controller 51. Among them, 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, when the controller 51 of the motor unit 50 controls 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 a forward or reverse direction, the controller 51 can wind up or release the front lifting cord 22 and the rear lifting cord 24, and further drive 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 topmost slat 30 approaches 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 are released to a predetermined length. The predetermined length referred to 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 respectively 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, so as to drive the multiple slats 30 to flip between the horizontal position P1 and the closed position P2 or P2', and bring the multiple slats 30 close to each other, the horizontal position P1 means that the slats 30 are in a horizontal state (see FIG. 1), and light can pass between the adjacent slats 30 at this time, and the closed position P2 or P2' means that the slats 30 are flipped in different directions to a nearly vertical state, so that the bottom part of the upper slat 30 overlaps with the top part of the lower slat 30 to block the transmission of light. Among them, the closed position P2 means that the front end of the slat 30 is low and the rear end is high (see Fig. 6 and Fig. 7), and the closed position P2' means that the front end of the slat 30 is high and the rear end is low (see Fig. 8). The overlap includes both physical overlap and visual overlap, and more specifically, the bottom of the upper slat 30 may be directly in contact with the top of the lower slat 30 and may be attached to the top of the lower slat 30, or the bottom of the upper slat 30 may be adjacent to the top of the lower slat 30 but not in direct contact. In this case, when observed from the front or rear side of the motorized blind 100, the upper slat 30 partially shields the lower slat 30 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 that of the previous embodiment, but the arrangement of the meridians is different from that of 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 of 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 meridian and one end of the rear meridian are connected to the angle adjustment wheel of the head beam, and the other ends of the front meridian and the rear meridian are connected to the slat located at the bottom end of the plurality of slats after passing through the front side and the rear side of the plurality of slats, respectively, instead of being connected 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 lift cord, rear lift cord and meridians are independently controlled by different motors, and the slats and bottom beam are independently driven by the ladder cord and lift cord, respectively, so that the above-mentioned ladder cord and lift cord arrangement can be applied, and the problem in the prior art that the operation of the ladder cord meridians and the lift cords are not synchronized, which affects the degree of closure of the blinds, can be solved.

[0019] In the preferred embodiment shown in Figs. 1 to 3, when the electric blind 100 is fully deployed (i.e., the bottom beam 20 is located at the lower limit position T2) and the user wants to control the slats 30 to reverse from the horizontal position P1 to the closed position P2 or P2' to effectively block light penetration into the room, the controller 51 operates 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, and 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 at the same time, a part of the rear meridian 32b is wound up upward, and at the same time as the angle adjustment wheel 48 rotates, the controller 51 synchronously operates the second lifting motor 56 and controls and rotates the second winding shaft 46 to wind up a part of the rear lifting cord 24.

[0020] It should be mentioned that in this embodiment, the width of the bottom beam 20 in the front-rear direction is approximately the same as the width of each slat 30 in the front-rear direction, and the rear lifting cord 24 is wound up so that the upward movement amount is equal to or greater than the upward movement amount of the rear meridian 32b, and the upward movement amount refers to the movement 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 amount of the rear lifting cord 24 is made larger than the upward movement amount of the rear meridian 32b. The reason for this setting is that, in actual use, if the upward movement amount of the rear lifting cord 24 is simply set equal to the upward movement amount of the rear meridian 32b, the center of gravity position 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 be constant, and a sufficient inclination angle may not be ensured. 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, so that the bottom beam 20 is brought into an almost upright position and close to or in contact with the bottom of the adjacent slat 30.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 a good degree of spacing between the multiple slats 30 close to the bottom beam 20 (as shown in Figures 6 and 7), thereby improving the light leakage defect that exists in the conventional structure.

[0021] However, the upward movement amount 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-rear direction is obviously smaller than the width of each slat 30 in the front-rear direction, in other words, the bottom beam has a thin and narrow shape and is narrowed in the front-rear direction more than each slat 30. In this way, the rotation radius of the bottom beam becomes shorter than the rotation radius of each slat 30 in the process of reversing from the horizontal state to the vertical state. Therefore, in this embodiment, by winding up the upward movement amount of the rear lifting cord 24 so that it is smaller than the upward movement amount of the rear meridian 32b, the bottom beam can be reversed approximately vertically to form a good closure with the slat 30. In other words, the electric blind 100 of the present invention uses the second lift motor 56 to flexibly adjust the amount of upward movement of the rear lift cord 24 in accordance with 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 enabling the bottom beam and the adjacent slats 30 to be closed well together.

[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 lift motor 56 to rotate the second winding shaft 46 to wind up a part of the rear lift cord 24 by operating the second lift motor 56, but also controls the first lift motor 54 to rotate the first winding shaft 44 in synchronization with the second lift motor 56 to release a part of the front lift cord 22. Among them, the downward movement amount of the front lift cord 22 is set to be released equal to or more than the downward movement amount of the front meridian 32a, and the downward movement amount is the movement amount by which the front lift cord 22 and the front meridian 32a are pulled downward with respect 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 to increase the amount of inversion of the front side of the bottom beam 20, thereby further promoting 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 abutting 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, and the predetermined rotation direction is a second direction. By the rotation of the angle adjustment wheel 48, a part of the rear meridian 32b of the ladder cord 32 is released downward, and at the same time, a part of the front meridian 32a is wound up upward. 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 to wind up a part of the front lifting cord 22, and the upward movement amount of the front lifting cord 22 is set to be equal to or greater than the upward movement amount of the front meridian 32a, and the upward movement amount refers to the movement amount by which the front lifting cord 22 and the front meridian 32a are pulled up relative to the reference plane B. In addition, the controller 51 also synchronously operates the second lifting motor 56 and controls the second winding shaft 46 to rotate to release a part of the rear lifting cord 24, and the downward movement amount of the rear lifting cord 24 is set to be equal to or greater than the downward movement amount of the rear meridian 32b, or the downward movement amount of the rear lifting cord 24 is set to be equal to the upward movement amount of the front lifting cord 22, and the downward movement amount refers to the movement amount 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 a sufficient inclination angle to be extremely close to or abut the adjacent slat 30 (for example, as shown in FIG. 8), thereby improving the defect of light leakage existing in the conventional structure.

[0024] In the above-mentioned embodiments, the predetermined rotation direction is the first direction or the second direction, but it is merely an example for the convenience of understanding, and the first direction may be the second direction opposite to the first direction, and the second direction may be 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 direction of the front meridian 32a, the rear meridian 32b, the front lifting cord 22, and the rear lifting cord 24 will be opposite to the direction described in the initial embodiment, but the definition of the movement amount of each meridian and lifting cord, and the resulting function of making the bottom beam 20 have a sufficient inclination angle to close well with the adjacent slat 30 are the same.

[0025] It should be further explained that, in order to smoothly raise or lower the bottom beam 20, two sets of combinations of the front lifting cord 22 and the rear lifting cord 24 for lifting the bottom beam 20 are provided. 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 is also provided with two sets of lifting and lowering 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 motorized blind 100 includes two first detectors 60a, 60b and two second detectors 70a, 70b (only shown in FIG. 9), which are provided on the head beam 10 and electrically connected to the controller 51. Among them, the two first detectors 60a and 60b are provided corresponding to the front lifting cords 22 on both the left and right sides, respectively, and detect tension changes in the front lifting cords 22 on both the left and right sides. The two second detectors 70a and 70b are provided corresponding to the rear lifting cords 24 on both the left and right sides, respectively, and detect tension changes in the rear lifting cords 24 on both the left and right sides. With this configuration, in addition to controlling the folding and unfolding of the motorized 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 motorized blinds 100 or change the angle of the blinds 30 by directly contacting 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 is provided with 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 second end corresponding thereto, and has 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 return force to bias the transmission member 62a in a direction from the second end to 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 in a tensioned state such that its tension can maintain an equilibrium relationship with the pull ring 64a, so that the transmission member 62a can resist the return force of the spring 68a, and as a result, its movable contact is in a position that does not contact the fixed contact 66a. When the front lift cord 22 goes from a tensioned state to a slack state, the transmission member 62a shifts due to the return force of the spring 68a, so that its movable contact comes into contact with 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 in a tensioned state. When the rear lift cord 24 goes from a tensioned state to a slack state, the second detector 70a is activated to send a signal to the controller 51.

[0029] FIG. 12 is a flow chart showing an embodiment of the method of operating the electric blind 100 in FIG. 1. Referring to FIG. 12, first, in step S11, the user controls the electric blind 100 to unfold via the controller 51, and moves the bottom beam 20 downward toward the lower limit 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, but the other 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 detector corresponding thereto transmits a signal to the controller 51. The detectors refer to the first detectors 60a and 60b corresponding to the left and right front lifting cords 22, respectively, and the 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 lift motor 54 and the second lift 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] Fig. 13 is a perspective view showing a cord control unit and a detector in an electric blind according to another preferred embodiment of the present invention, and Fig. 14 is a structural block diagram of an assembly part electrically connected to the electric blind. Please refer to Fig. 13 and Fig. 14. In this embodiment, the electric blind 100' also includes two first detectors 60a', 60b' provided corresponding to the two front lifting cords 22 on the left and right sides, and two second detectors 70a', 70b' provided corresponding to the two rear lifting cords 24 on the left and right sides, which are tension detectors electrically connected to the controller 51 and have built-in chips with computing power. Other than that, the components and structure of the electric blind 100' are the same as those of the electric blind 100 in Fig. 1, so repeated explanations will be omitted.

[0031] 15A and 15B are flow charts showing an embodiment of a method for operating the electric blind 100' in FIG. 14. Please refer to FIG. 15A and 15B. First, in step S20, the electric blind 100' in a stationary state is lifted upward while supporting the bottom beam 20 with the hands. Since the user does not intentionally align the bottom beam 20 with the center during the lifting process, the front lifting cord 22 and the rear lifting cord 24 located on the same side of the left or right side will loosen from the tensioned state and the tension will be reduced depending on the position where the force is applied and the amount of force. For example, if the position where the force is applied is biased to the left side of the bottom beam 20, the front lifting cord 22 and the rear lifting cord 24 on the left side will loosen from the original tensioned state before the front lifting cord 22 and the rear lifting cord 24 on the right side during the process of lifting the bottom beam 20. At this time, in step S21, the first detector 60a' detects a decrease in the tension of the left front lift-down cord 22, determines that the tension value of the left front lift-down cord 22 is less than a preset value, and after this determination result is maintained for a preset time or more (e.g., 0.5 seconds), transmits a signal to the controller 51. Almost simultaneously, the second detector 70a' also detects a decrease in the tension of the left rear lift-down cord 24, determines that the tension value of the left rear lift-down cord 24 is less than a preset value, and after this determination result is maintained for the preset time or more, transmits a signal to the controller 51.

[0032] On the other hand, if the position of the force application is biased to the right side of the bottom beam 20 in the previous step S20, in this step S21, another set of the first detector 60b' and the second detector 70b' detects and determines that the tension values ​​of the corresponding right front lifting cord 22 and right rear lifting cord 24 are sustained for a time longer than the predetermined time and are smaller than the predetermined value, and then transmits a signal to the controller 51. In this embodiment, either of the above two situations does not affect 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 a desired height, the bottom beam 20 in the process of rising is lifted upward again while being supported by hand. In the process of lifting, the front lifting cord 22 and the rear lifting cord 24 located on the same side, either the left or right side, are loosened from the taut state and the tension is reduced depending on the position of force application and the amount of force applied.

[0034] Next, in step S24, if the position where 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 value of the corresponding left front lifting cord 22 and rear lifting cord 24 is less than the preset value, and after this determination result is maintained for the preset time or more, they each send a signal to the controller 51. In the previous step S23, if the position where the force is applied to the bottom beam 20 by the user's hand is biased to the right, another set of the first detector 60b' and the second detector 70b' determine that the tension value of the corresponding right front lifting cord 22 and rear lifting cord 24 is less than the preset value, and after this determination result is maintained for the preset time or more, they each send a signal to the controller 51. In this embodiment, whichever of the above two situations is present, does not affect the next step.

[0035] Referring to FIG. 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 lifting motor 54 and the second lifting motor 56 to stop the rotation of the first winding shaft 44 and the second winding shaft 46, respectively, and stops the operation of the bottom beam 20. At this time, the motorized blind 100' becomes stationary. In step S26, the bottom beam 20 of the motorized blind 100' in a stationary state is lifted upward by hand for the third time, and in the process of lifting, the front lifting cord 22 and the rear lifting cord 24 located on the same side, either the left or right side, become loose from the taut state and the tension becomes smaller depending on the position where the force is applied and the amount of force applied.

[0036] In step S27, if the position where the user's hand applies force to the bottom beam 20 is biased to the left in the previous step S26, 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 preset value, and after this determination result is maintained for the preset time or more, 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 biased to the right, the first detector 60b' and the second detector 70b' determine that the tension value of the corresponding right front lifting cord 22 and rear lifting cord 24 is less than the preset value, and after this determination result is maintained for the preset time or more, they each send a signal to the controller 51. In this embodiment, whichever of the above two situations occurs does not affect 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 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, 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 the above steps S22, S25 and S28, the controller 51 simultaneously receives signals from the left first detector 60a' and the left second detector 70a', or simultaneously receives signals from the right first detector 60b' and the right second detector 70b', 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 60a' and the left second detector 70a', or simultaneously receives signals from the right first detector 60b' and the right second detector 70b', and then switches the operation of the bottom beam 20 between the raising and lowering operations.

[0038] Fig. 16 is a flow chart showing another embodiment of the method of operating the motorized blind 100' in Fig. 14. Referring to Fig. 16, first, in step S30, the user controls the folding of the motorized 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 motorized blind 100' while supporting the bottom beam 20 with their hands while folding it up. In the process of lifting, 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 where the force is applied and the amount of force applied.

[0039] In step S32, if the position where the user's hand applies force to the bottom beam 20 is biased to the left in the previous step S31, the first detector 60a' and the second detector 70a' detect and determine that the tension value of the corresponding left front lift cord 22 and rear lift cord 24 is less than the preset value at almost the same time, and after this determination result is maintained for a preset time or more (e.g., 0.5 seconds), they each transmit 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 biased to the right, another pair of the first detector 60b' and the second detector 70b' detect and determine that the tension value of the corresponding right front lift cord 22 and rear lift cord 24 is less than the preset value, and after this determination result is maintained for the preset time or more, they each transmit a signal to the controller 51. In this embodiment, whichever of the above two situations occurs does not affect 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 opposite direction 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 operation of the bottom beam 20 is converted from upward to downward.

[0041] Then, in step S34, the user lifts the bottom beam 20, which is in the process of lowering, upward with respect to the electric blind 100', which is in the process of unfolding. In the process of lifting, the bottom beam 20 remains in an almost horizontal state, and the front lifting cord 22 and the rear lifting cord 24, which are located on the same side, either the left or right side, loosen from the taut state and become less tensile, depending on the position and amount of force applied. In step S35, if the position where the user's hand applies force to the bottom beam 20 in the previous step S34 is biased to the left side, 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 more, they each transmit 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 side, another pair of the first detector 60b' and the second detector 70b' detects and determines that the tension value of the corresponding right front lifting cord 22 and rear lifting cord 24 is less than the preset value, and after this determination result is maintained for the preset time or more, they respectively send a signal to the controller 51. In this embodiment, either of the above two situations does not 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 opposite direction to the 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 raising it to the upper limit position T1.

[0043] The above-mentioned operation is only an example. By using the first detector 60a', 60b', the second detector 70a', 70b' and the controller 51 in combination, different operation modes can be designed as needed, for example, the number of times the bottom beam 20 is lifted (i.e., the number of times the front lift cord 22 and the rear lift cord 24 on the same side, either the left or right, are in a slack state) can be set to be different, the time the bottom beam 20 is lifted (i.e., the duration the front lift cord 22 and the rear lift cord 24 on the same side, either the left or right, are in a slack state) 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 lift cord 22 and the rear lift cord 24 on the same side, either the left or right side, have slackened to when the motors are actually controlled), the controller 51 can use this as a basis for sending different commands to the first lift motor 54 and the second lift motor 56, while also controlling the raising, lowering, stopping or moving the bottom beam 20 of the electric blind 100' to a specific position, 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 indicating that the tension of the front lift cord 22 has been decreased from the first detectors 60a', 60b' corresponding to the left and right front lift cords 22, or simultaneously receives signals indicating that the tension of the rear lift cord 24 has been decreased from the second detectors 70a', 70b' corresponding to the left and right rear lift cords 24, the controller 51 drives the angle adjustment motor 58 to rotate the angle adjustment wheel 48 in a specific direction, thereby inverting the slats 30 and adjusting the amount of light passing through between the slats 30. For detailed examples, please refer to the following two embodiments.

[0045] Fig. 17 is a flow chart showing another embodiment of the operation method of 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 be rotated at a preset certain angle each time (for example, but not limited to, an angle of 30 degrees or an angle of 40 degrees), and in a specific rotating step in which the slats 30 are rotated to a 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 turned upward, and at this time, the front end of the bottom beam 20 is turned downward correspondingly, so that the front lifting cords 22 on both the left and right sides of the electric blind 100' are kept taut to keep the tension within a preset range, but the rear lifting cords 24 on both the left and right sides are slackened to reduce the tension. In step S42, the second detectors 70a' and 70b' corresponding to the two rear lifting cords 24 respectively detect that the tension of the two rear lifting cords 24 is less than the preset value, and send a signal to the controller 51. In step S43, after simultaneously receiving the signals from the second detectors 70a' and 70b', the controller 51 determines whether the plurality of slats 30 reach the closed state after being turned over at the preset certain angle. If not, proceed 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 (for example, 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 multiple slats 30 at the preset certain angle so that the rear ends face upward and the front ends face downward. Then, the controller 51 may choose to return to step S41 and reversing the rear ends of the bottom beam 20 upward again to continue adjusting the inclination angles of the slats 30.

[0048] On the other hand, in step S43, when the controller 51 determines that the plurality of slats 30 have reached the closed state after reversing the predetermined constant 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 lifting motor 54 and the second lifting 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 shifting the front meridians 32a and the rear meridians 32b on both the left and right sides by moving them in the opposite directions, thereby reversing the plurality of slats 30 in the direction in which the rear ends face upward and the front ends face downward at the predetermined constant angle, 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 have the same downward movement amount and the downward movement amount of the left and right front lifting cords 22 is greater than the downward movement amount 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 following 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 left and right rear lifting cords 24, among which the upward movement amounts of the left and right rear lifting cords 24 are the same, and the upward movement amounts of the left and right rear lifting cords 24 are at least equal to the upward movement amounts of the left and right rear meridians 32b, but preferably greater than the upward movement amounts of the left and right rear meridians 32b, 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 FIG. 1, that is, can be implemented using the first detectors 60a, 60b and the second detectors 70a, 70b that function as microswitches.

[0052] Meanwhile, the user can also reverse the bottom beam 20 to the other direction to perform the same operation. Figure 18 is a flow chart showing another embodiment of the operation method of the electric blind 100' in Figure 14. Please refer to Figure 18, first, in step S51, the front end of the bottom beam 20 is reversed upward, and at this time, the rear end of the bottom beam 20 is correspondingly reversed downward, and the rear lifting cords 24 on both the left and right sides of the electric blind 100' can still maintain a taut state and keep the tension within a preset range, but the front lifting cords 22 on both the left and right sides become slack and the tension becomes smaller. In step S52, the first detectors 60a', 60b' corresponding to the two front lift-down cords 22 determine whether the tension of the left and right front lift-down cords 22 corresponding to each of them is less than a preset value, and if it is less than the preset value, the process proceeds to the next step S53, and the first detectors 60a, 60b each send a signal to the controller 51 after a preset time (e.g., 0.5 seconds) has elapsed since the determination was made.

[0053] Next, in step S54, the controller 51 transmits a second inversion signal to the angle adjustment motor 58 after receiving the two signals simultaneously, and at the same time, the controller 51 transmits a first control signal and a second control signal to the first lift motor 54 and the second lift motor 56, respectively. In step S55, the angle adjustment motor 58 receives the second inversion 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 of the left and right sides in the opposite directions to shift them up and down, thereby inverting the multiple slats 30 in the direction in which the front ends face upward and the rear ends face downward 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 winding 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 the downward movement amounts of the left and right rear lifting cords 24 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-mentioned operation is merely an example. By using the first detectors 60a', 60b', the second detectors 70a', 70b' and the controller 51 in combination, different operation modes can be designed as required. For example, the reversal angle of the bottom beam 20 can be set to be different, the reversal time of the bottom beam 20 (i.e., the duration during which the front lift cords 22 on both the left and right sides or the rear lift cords 24 on both the left and right sides are simultaneously in a slack state) can be set to be different, or the delay time after the bottom beam 20 is reversed (i.e., the time from the time when it is detected that the front lift cords 22 on both the left and right sides or the rear lift cords 24 on both the left and right sides are slackened to the time when the motor actually rotates) can be set to be different. By setting the time (time until control is performed) differently, the controller 51 can send different commands to the angle adjustment motor 58, the first lift motor 54 and / or the second lift motor 56, thereby controlling the electric blind 100' to reverse the slats 30, and in a specific reversal step in which the multiple slats 30 are about to be reversed from the non-closed position to the closed position P2 or P2', the front lift cords 22 on both the left and right sides or the rear lift 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 inversion of the slats 30, as in the embodiment shown in Figure 18, the slats 30 can be directly inverted from the horizontal position P1 to the closed position P2 or P2', or conversely, can be inverted from the closed position P2 or P2' to the horizontal position P1. Furthermore, as in the embodiment shown in Figure 17, the inversion operation of each slat 30 from the horizontal position P1 to the closed position P2 or P2' can be performed sequentially in multiple stages, and the inversion angles of the multiple slats 30 in each stage can be approximately the same value. Furthermore, in another embodiment of the present invention, the first detector 60a', 60b' and the second detector 70a', 70b', which have high measurement accuracy, are used to detect the tension data of the corresponding lifting cord, and the controller 51 is used to flip the slat 30 to one intermediate position between the horizontal position P1 and the closed position P2 or P2' based on the measured data, so that the flip angle of the slat 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 the cord control unit 40 as shown in Fig. 4. The first lift motor 54, the second lift motor 56, the angle adjustment motor 58, and the lift 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 Fig. 9.

[0058] 19 and 20, in another preferred embodiment of the present invention, the motorized blind 110 includes a head beam 10', a bottom beam (not shown), a plurality of slats (not shown), and further includes 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 in 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', which penetrate the top and bottom surfaces of the bottom plate 12' on both the left and right sides.

[0059] 19 and 20, the front lifting cord electromechanical control unit 40' includes a first lifting motor 41 and a first winding shaft 43 that is provided in an upright state, and the two are connected by a gear transmission mechanism (only a part of a spur gear that meshes with a toothed disk at the upper end of the first winding shaft 43 is shown) provided in a first shell 45. One end of the right front lifting cord 22 is fixed to and wound around the upper one of the two grooves of the first winding shaft 43, and the other end extends into the right third shell 57 and extends downward to pass through the through hole 57a thereof, and then passes through one wire hole 12a' adjacent to the right side of the head beam 10', and is then fixed to the bottom beam (not shown). At the same time, one end of the left front lifting cord 22 is fixed to 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', and is then fixed to the bottom beam (not shown). The first lifting motor 41 drives the first winding shaft 43 to rotate about a 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 winding shaft 63 that is provided in an upright state, and the two are connected by a gear transmission mechanism (only a part of a spur gear that meshes with a toothed disk at the upper end of the second winding shaft 63 is shown exposed) provided in a second shell 65. One end of the left rear lifting cord 24 is fixed to and wound around the upper one of the two grooves of the second winding shaft 63, and the other end extends into the left third shell 57 and extends downward to pass through the through hole 57b thereof, and further passes through one wire hole 12b' adjacent to the left side of the head beam 10', and then is 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', and is then 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 the left and right rear lifting cords 24, or synchronously releasing 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 provided in the motor box 53, and the two angle adjustment wheels 59 are provided in the 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 to rotate, and when the two shafts 55a and 55b rotate, the two angle adjustment wheels 59 rotate synchronously, so that one of the front meridians 32a and the rear meridians 32b of each ladder cord 32 moves upward and the other moves downward. At the same time, the electric blind 110 of this embodiment is provided with two first detectors 71a and 71b corresponding to the front lifting cords 22 on the left and right sides, and two second detectors 81a and 81b corresponding to the rear lifting 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 realize all of the same operation methods as the electric blind 100 described above.

[0062] To sum up, 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, so that the angle adjustment motors 55, 58 can be linked to release or roll up the front meridians 32a and rear meridians 32b according to the bottom beams 20 of different sizes and shapes, so that the bottom beams 20 are extremely close or abutted against the adjacent slats 30 when the motorized blinds 100, 100' and 110 are in the closed state, which greatly improves the problem of poor closing caused by the lift cords and the meridians not being synchronized. In addition, by providing a detector that can detect the tension change corresponding to each lift cord, the motorized blinds 100, 100' and 110 of the present invention can be operated by directly touching the bottom beams 20 in addition to being controlled by the controller 51, which can bring consumers an innovative and convenient user experience.

[0063] The above are merely preferred embodiments that can realize the present invention, and any 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 Code 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 lift motor, a second lift 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 a ladder cord, and the ladder cord has a front meridian and a rear meridian, one end of the front meridian and the rear meridian are connected to an angle adjustment wheel provided on the head beam; the plurality of slats are located between the front meridian and the rear meridian, the front meridian and the front lifting cord pass through one side of the slats, and the rear meridian and the rear lifting cord pass through the other side of the slats; the first lifting motor controls rotation of the first winding shaft to wind up or release the front lifting cord; the second lifting motor controls 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 inverting 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 one of the front meridian and the rear meridian moves upward and the multiple slats are flipped from the horizontal position to the closed position, either one of the front lifting cord and the rear lifting cord, which is located on the same side of the multiple slats as the upward moving front meridian or the rear meridian, 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 an adjacent slat.

2. the head beam has a reference plane through which the front lift cord, the rear lift 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 motorized blind of claim 1 , wherein the upward movement is defined as the amount of upward movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian relative to the reference plane.

3. the head beam has a reference plane through which the front lift cord, the rear lift 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 motorized blind of claim 1 , wherein the upward movement is defined as the amount of upward movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian relative to the reference plane.

4. the head beam has a reference plane through which the front lift cord, the rear lift 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 motorized blind of claim 1 , wherein the upward movement is defined as the amount of upward movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian relative to the reference plane.

5. the head beam has a reference plane through which the front lift cord, the rear lift cord, the front meridian, and the rear meridian pass; When the plurality of slats are inverted 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 amount of downward movement is defined as the amount of movement that the front lift cord, the rear lift cord, the front meridian, and the rear meridian are pulled downward relative to the reference plane.

6. 2. The motorized blind of claim 1, 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 motorized 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, to stop the rotation of the first winding shaft and the second winding shaft.

8. 7. The motorized 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 to simultaneously release the front lift cord and the rear lift cord or simultaneously wind up the front lift cord and the rear lift cord.

9. 7. The motorized blind according to claim 6, wherein, when the tension detected by only the second detector among the first detector and the second detector is less than a preset value, a first reversal signal is sent to drive the angle-adjusting motor to rotate the angle-adjusting 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 among the first detector and the second detector is less than a preset value, a second reversal signal is sent to drive the angle-adjusting motor to rotate the angle-adjusting wheel in a second direction, thereby winding up the front meridian and releasing the rear meridian.

10. 7. The motorized blind of claim 6, wherein the first detector and the second detector are provided on the head beam, the front lift cord extends from the first winding shaft and passes through the first detector, and the rear lift 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 lift motor, a second lift 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 a ladder cord, and the ladder cord has a front meridian and a rear meridian, one end of the front meridian and the rear meridian are connected to an angle adjustment wheel provided on the head beam; the plurality of slats are located between the front meridian and the rear meridian, the front meridian and the front lifting cord pass through one side of the slats, and the rear meridian and the rear lifting cord pass through the other side of the slats; the first lifting motor controls rotation of the first winding shaft to wind up or release the front lifting cord; the second lifting motor controls 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 inverting 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 in a stationary state, and only the tension detected by the second detector among the first detector and the second detector is less than a predetermined value, the controller transmits 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 in a stationary state, and only the tension detected by the first detector among the first detector and the second detector is less than the predetermined value, the controller transmits 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 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 slats and partially overlaps the adjacent slats; and / or When the controller sends the second reversal signal, the angle adjustment motor controls the angle adjustment wheel to reverse the multiple 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 and reverse the bottom beam to a substantially vertical position in the same direction as the reverse direction of the multiple slats and so as to partially overlap the adjacent slats, an electric blind.

12. the head beam has a reference plane through which the front lift cord, the rear lift 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 controls 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 controls the first lift motor to rotate the first winding shaft to wind up the front lift cord, an upward movement of the front lift cord is greater than an upward movement of the front meridian; 12. The motorized blind of claim 11, wherein the upward movement is defined as the amount of upward movement of the front lift cord, the rear lift cord, the front meridian, and the rear meridian 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 to release the front lifting cord; 12. The motorized blind of 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 lift cord, the rear lift 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 lift motor to rotate the first winding shaft to release the front lift cord, a downward movement of the front lift cord is greater than a downward movement 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, 14. The motorized blind of claim 13, wherein the amount of downward movement is defined as the amount of movement that the front lift cord, the rear lift cord, the front meridian, and the rear meridian are pulled downward relative to the reference plane.

15. The motorized blind of claim 11, wherein, when both of 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 change the moving states of the first winding shaft and the second winding shaft, respectively, thereby releasing the front lift cord and the rear lift cord simultaneously, winding up the front lift cord and the rear lift cord simultaneously, or stopping the front lift cord and the rear lift cord that are moving.

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