JP7361878B2 - electric horizontal blinds - Google Patents

Description

The present invention relates to a motorized horizontal blind.

In the electric horizontal blind disclosed in Patent Document 1, the slats and the bottom rail are raised and lowered by winding up and unwinding the lifting cord onto the winding tube using a motor.

Patent Document 2 discloses a configuration in which a plurality of lifting cords are arranged on opposite sides of each other with a slat interposed therebetween.

Japanese Patent Application Publication No. 10-30385 JP2018-053712A

In the electric horizontal blind of Patent Document 1, in which the arrangement of the lifting cord is adopted as in Patent Document 2, when the bottom rail is raised to the upper limit position, the lifting cord and the slats rub near the upper limit, causing the slats to become damaged. It has been found that the phenomenon of flapping may occur in some cases.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electric horizontal blind that can suppress flapping of the slats when the bottom rail is raised.

According to the present invention, an electric horizontal blind includes a head box, a ladder cord, a lifting cord, a slat group composed of a plurality of slats, and a bottom rail arranged below the slat group, A ladder cord and the lifting cord are suspended from the head box, the slat group and the bottom rail are supported by the ladder cord, and the lifting cord includes first and second lifting cords, and the lifting cord includes first and second lifting cords. The second lifting cords are suspended at positions offset from each other in the front-back direction, and the slats have edges that abut against the first and second lifting cords and maintain the positions where the first and second lifting cords are offset from each other in the front-back direction. An electric horizontal blind that automatically tilts the slats in a direction that reduces the frictional force between the slats having a predetermined height or more and the first and second lifting cords when the first and second lifting cords are raised. is provided.

In the configuration of the present invention, when the first and second lifting cords are pulled up, the slats are automatically inclined in a direction that reduces the frictional force between the slats having a predetermined height or more and the first and second lifting cords. Therefore, it is possible to suppress the slats from flapping when the bottom rail is raised.

Various embodiments of the present invention will be illustrated below. The various embodiments shown below can be combined with each other.
Preferably, the electric horizontal blind includes a head box, a ladder cord, a lifting cord, a slat group composed of a plurality of slats, and a bottom rail disposed below the slat group, the ladder cord and The elevating cord is suspended from the head box, the slat group and the bottom rail are supported by the ladder cord, the elevating cord includes first and second elevating cords, and the elevating cord includes first and second elevating cords. The cords are suspended at positions shifted from each other in the front-back direction, and the slats are provided with edges that abut the first and second lifting cords to maintain the positions where the first and second lifting cords are shifted from each other in the front-back direction; An electric horizontal blind that automatically tilts the slats in a direction that reduces the force acting in the direction in which the first and second lifting cords sandwich the slats of a predetermined height or higher when the first and second lifting cords are pulled up. It is.

Preferably, the electric horizontal blind includes a head box, a ladder cord, a lifting cord, a slat group composed of a plurality of slats, and a bottom rail disposed below the slat group, the ladder cord and The elevating cord is suspended from the head box, the slat group and the bottom rail are supported by the ladder cord, the elevating cord includes first and second elevating cords, and the elevating cord includes first and second elevating cords. The cords are arranged so that their respective hanging positions are shifted in the front-back direction, and the lifting cord contacts the lifting cord in a shifted state on the slat, and the first and second lifting cords maintain the shifted state. the bottom rail is capable of being raised and lowered by the lifting cord, and when raising the bottom rail from the lower limit position of the bottom rail, the inclination angle of the slat group at the start of the raising is Also, in the electric horizontal blind, the inclination angle of the slat group is larger when the bottom rail is at a predetermined height or more.

Preferably, in the electric horizontal blind described above, the slats include a notch on one of a pair of long sides, and the slat group is inclined such that the notch faces downward during the lifting operation. , an electric horizontal blind.
Preferably, the electric horizontal blind described above is an electric horizontal blind in which tilting operation of the slat group is prohibited while the bottom rail is being raised.
Preferably, in the electric horizontal blind described above, when the bottom rail reaches a predetermined height when the bottom rail is raised, the ladder cord rotates so as to increase the inclination angle of the slat group. This is an electric horizontal blind in which the bottom rail rises in that state.
Preferably, the electric horizontal blind described above is an electric horizontal blind, in which the rotation is in a normal fully closing direction.
Preferably, in the electric horizontal blind described above, when the bottom rail is raised, until the predetermined height is reached, the ladder cord is such that the inclination angle of the uppermost slat is 20 degrees with respect to the horizontal plane. This is an electric horizontal blind with the following conditions.
Preferably, in the electric horizontal blind described above, when the bottom rail reaches a lower limit position during a lowering operation of the bottom rail, the slat group is tilted toward the inside of the room from the horizontal direction. This is an electric horizontal blind in which the slat group is rotated so as to be in a closed state.
Preferably, in the electric horizontal blind described above, the slat group is in the normally fully closed state until the bottom rail reaches the lower limit position, and when the bottom rail reaches the lower limit position, the slat group is closed. The electric horizontal blind rotates from the fully closed state to the room side tilted state, and then the slat group rotates from the room side tilted state to the fully closed state.
Preferably, the electric horizontal blind described above is an electric horizontal blind in which the room-inward tilted state is a reverse fully closed state.

1 is a perspective view of an electric horizontal blind 1 according to a first embodiment of the present invention. 2 is an enlarged view of area A in FIG. 1. FIG. 2 is an enlarged view of region B in FIG. 1. FIG. 4A is a plan view schematically showing the inside of the head box 2, and FIG. 4B is an enlarged view of region B in FIG. 4A. It is a functional block diagram of control part 16a. FIG. 3 is a front view showing the configuration of the operating section 14. FIG. FIG. 2 is a schematic diagram of the electric horizontal blind 1 viewed from the right side with the bottom rail 6 at the upper limit position. 8 is a schematic diagram showing a state in which the bottom rail 6 is being lowered from the state shown in FIG. 7. FIG. FIG. 9 is a schematic diagram showing a state in which the bottom rail 6 is further lowered from the state in FIG. 8 and reaches the lower limit position. It is a schematic diagram which shows the state after rotating the slat group 5f so that the slat group 5f will be in the state of FIG. 9 or the room inward tilting state. 11 is a schematic diagram showing a state after the slat group 5f has been rotated from the state shown in FIG. 10 so that the slat group 5f is in a fully closed state. FIG. 12 is a schematic diagram showing a state in which the bottom rail 6 is being raised from the state shown in FIG. 11. FIG. 13 is a schematic diagram showing a state when the bottom rail 6 reaches a predetermined height near the upper limit from the state shown in FIG. 12. FIG. 14 is a schematic diagram showing a state after the bottom rail 6 has been raised from the state shown in FIG. 13 until the top slat 5a abuts the lower surface 2a of the head box 2. FIG. 3 is a cross-sectional view of the support member 13 and the tilter drum 12. FIG. 7 is a flowchart showing a method for setting the lower limit position of the bottom rail 6. FIG. 7 is a flowchart showing a method for setting the upper limit position of the bottom rail 6. FIG. FIG. 18A shows the slat 5a before reaching the predetermined height, and FIG. 18B shows the slat 5a after reaching the predetermined height. A modification of the rotation preventing means for the tilt shaft 11 is shown, in which FIG. 19A is a view seen from the tilt motor 10 side, and FIG. 19B is a right side view of FIG. 19A.

Hereinafter, various embodiments of the present invention will be described using the drawings. The various embodiments shown below can be combined with each other.

1. First Embodiment An electric horizontal blind 1 according to a first embodiment of the present invention will be described.

1-1. Overall Configuration As shown in FIGS. 1 to 4, the electric horizontal blind 1 includes a head box 2, a ladder cord 3, a lifting cord 4, a slat group 5, and a bottom rail 6. A ladder cord 3 and a lifting cord 4 are suspended from the head box 2.

The slat group 5 and the bottom rail 6 are supported by the ladder cord 3. The ladder cord 3 is configured such that a pair of weft yarns 3b are provided in multiple stages between a pair of warp yarns 3a. A slat 5a is inserted between each pair of weft threads 3b. The slat group 5 is composed of multiple stages of slats 5a. In the uppermost slat 5a, the weft thread 3b is fixed to the slat 5a by a slat presser 15. In the following description, when it is necessary to distinguish, the slats 5a (floating slats) of the slat group 5 are not stacked on the bottom rail 6 (in other words, supported by the weft 3b). The group is referred to as a slat group 5f. As shown in FIG. 1, when the bottom rail 6 is at the lower limit position, the slat group 5 and the slat group 5f match.

The bottom rail 6 is arranged below the slat group 5. The lower end of the ladder cord 3 and the lower end of the lifting cord 4 are connected to the bottom rail 6. The bottom rail 6 can be raised and lowered by a lifting cord 4. The lifting cord 4 is arranged along the warp thread 3a. The elevator cord 4 includes an elevator cord 4a arranged on the inside of the room as shown in FIG. 2, and an elevator cord 4b arranged on the outside of the room as shown in FIG. The lifting cords 4a and 4b are arranged along the edges of the slats 5a, and are arranged on opposite sides of the slat group 5. The lifting cords 4a and 4b are maintained at positions offset from each other in the front-rear direction by the edges of the slats 5a.

The lifting cords 4a and 4b are arranged so that the bottom rail 6 is horizontal. In this embodiment, among the plurality of lifting cords 4, lifting cords 4b are arranged at both left and right ends, and lifting cords 4a are arranged at the center. The lifting cords 4a, 4b are inserted between the pair of weft threads 3b at positions corresponding to the second and subsequent slats 5a. The lifting cord 4b and the warp thread 3a can be engaged with a notch 5b provided in the slat 5a, thereby suppressing lateral displacement of the slat 5a. The cutout 5b is preferably provided on one of the pair of long sides of the slat 5a.

Note that the number and arrangement of the lifting cords 4a, 4b and the notches 5b can be changed as appropriate. For example, the lifting cords 4a and 4b may be inserted between a pair of weft threads 3b at positions corresponding to the third and subsequent slats 5a, or may not be inserted between a pair of weft threads 3b. good.

As shown in FIG. 4, inside the head box 2, there are a lifting motor (an example of a "motor") 7, a lifting shaft (an example of a "drive shaft") 8, a winding tube 9, and a tilt motor (an example of a "motor"). 10, a tilt shaft (an example of a "drive shaft") 11, a tilter drum 12, a support member 13, encoders 8a and 11a, and a control board and a power supply board (not shown). The same number of winding tubes 9 as the lifting cords 4 are provided. The number of tilter drums 12 is the same as the number of ladder cords 3. The rotation angles of the lift shaft 8 and the tilt shaft 11 can be detected by encoders 8a and 11a. Further, the magnitude of the drive current of the lift motor 7 and the tilt motor 10 can be detected by a current detection section provided on the control board. The winding tube 9 and the tilter drum 12 are rotatably supported by a support member 13.

A power cord (not shown) is connected to the power supply board, and AC power supplied through the power cord is converted to DC power in the power supply board. This DC power drives members such as the lifting motor 7, the tilt motor 10, the control board, and the encoders 8a and 11a. A program necessary for control is recorded on the control board, and the electric horizontal blind 1 operates according to this program. With such a program, the control section 16a having the configuration shown in FIG. 5 is realized. The control unit 16a includes an elevation motor control unit (an example of a “motor control unit”) 7a that controls the operation of the elevation motor 7, and a tilt motor control unit (an example of a “motor control unit”) that controls the operation of the tilt motor 10. 10a is configured.

As the lifting motor 7 rotates, the lifting shaft 8 rotates, and as the lifting shaft 8 rotates, the winding tube 9 rotates. The upper end of the lifting cord 4 is connected to a winding tube 9, and as the lifting tube 9 rotates, the lifting cord 4 is wound around or unwound onto the winding tube 9, thereby raising and lowering the bottom rail 6. .

As the tilt motor 10 rotates, the tilt shaft 11 rotates, and as the tilt shaft 11 rotates, the tilter drum 12 rotates. In the ladder cord 3, the upper ends of a pair of warp threads 3a are connected to the tilter drum 12. As the tilter drum 12 rotates, the ladder cord 3 also rotates (in other words, the pair of warp yarns 3a move relative to each other in the vertical direction), and the inclination angle of the slat group 5f changes.

The electric horizontal blind 1 can be operated using an operating section 14 shown in FIG. The operation unit 14 can communicate with a control unit provided on a control board by wire or wirelessly. The operation unit 14 includes a rise button 14a, a fall button 14b, a normal full-close button 14c, a reverse full-close button 14d, and a stop button 14e. The bottom rail 6 can be raised by pressing the rise button 14a. The bottom rail 6 can be lowered by pressing down the lowering button 14b. By pressing the normal full close button 14c, the slat group 5f can be rotated in the normal full closing direction. By pressing the reverse fully close button 14d, the slat group 5f can be rotated in the reverse fully close direction. Each operation can be stopped by pressing the stop button 14e. Fully closed is a state in which the slat group 5f is tilted to the maximum extent in a direction in which the upper surface of the slat 5a faces toward the outside of the room. Reverse fully closed is a state in which the slat group 5f is tilted to the maximum extent in a direction in which the upper surface of the slat 5a faces toward the inside of the room.

Since the inclination state of the slat group 5f is determined by the state of the ladder cord 3, in the following explanation, the ladder cord 3 is The states in which the ladder cord 3 is rotated are respectively referred to as a normal fully closed state, a reverse fully closed state, a horizontal state, and a tilted state.

1-2. Operation of the electric horizontal blind 1 The operation of the electric horizontal blind 1 will be explained using FIGS. 7 to 17. In FIGS. 7 to 14, illustration of the ladder cord 3 and the lifting cord 4 is omitted for convenience of illustration.

(1) Lowering operation For the sake of explanation, a state in which the bottom rail 6 is at the upper limit position as shown in FIG. 7 is assumed to be an initial state. In this state, all the slats 5a of the slat group 5 are stacked on the bottom rail 6.

When the lowering button 14b is pressed from the state shown in FIG. 7, the ladder cord 3 is rotated so as to be in the normally fully closed state as shown in FIG. do. As the bottom rail 6 descends, the slats 5a move away from the bottom rail 6 in order from above and are supported by the weft threads 3b. Until the bottom rail 6 reaches the lower limit position, the warp threads 3a of the ladder cord 3 are slack near the bottom rail 6, and the lifting cord 4 carries the entire load of the bottom rail 6 and the slats 5a riding on it. It is ready to receive. Therefore, even if the ladder cord 3 is in the fully closed state, the bottom rail 6 and the slats 5a stacked thereon are horizontal. On the other hand, like the ladder cord 3, the slat group 5f is in a fully closed state.

Here, a method for setting the lower limit position of the bottom rail 6 will be described using the flowchart of FIG. 16.
First, as described above, when the bottom rail 6 is lowered (step A1), the elevator motor control section 7a rotates the elevator motor 7 so that the elevator shaft 8 rotates in the direction in which the elevator cord 4 is unwound. Along with this, the lifting cord 4 is rewound and the bottom rail 6 begins to descend. When the bottom rail 6 descends until the warp threads 3a are no longer slack, the warp threads 3a come to receive the load of the bottom rail 6, and the load applied to the lifting cord 4 is reduced. The winding tube 9 is equipped with an obstacle detection and stop device (an example of a "rotation prevention means") having a clutch with the same configuration as in JP-A-2005-179994, and the rotation of the lifting shaft 8 is controlled by the clutch. The signal is transmitted to the cylinder 9. Then, when the load applied to the lifting cord 4 is reduced, a difference occurs between the rotational speeds of the lifting shaft 8 and the winding tube 9, and the obstacle detection and stop device is activated, preventing the rotation of the lifting shaft 8 and lifting/lowering. The rotation of the shaft 8 is stopped (step A2). Stopping the rotation of the lifting shaft 8 is detected by the encoder 8a. Furthermore, when the rotation of the lifting shaft 8 is blocked, an overcurrent is generated in the lifting motor 7. When the above rotation stop or overcurrent is detected (step A3), the lifting motor control section 7a stops the lifting motor 7 (step A4). The stopping time of the lifting motor 7 is, for example, 0.1 to 3 seconds.

Next, the lifting motor control unit 7a reversely rotates the lifting motor 7 by a predetermined amount (that is, rotates in the winding direction of the lifting cord 4) (step A5). The obstacle detection and stop device is configured to be deactivated when the lifting shaft 8 is rotated in the opposite direction. Therefore, as the lifting motor 7 is reversely rotated, the operation of the obstacle detection and stop device is canceled (step A6), and then the lifting motor control unit 7a stops the lifting motor 7 (step A7). The amount by which the lifting motor 7 is reversely rotated may be greater than or equal to the amount required to deactivate the obstacle detection and stop device, for example, 1 to 3 times the amount required to deactivate the obstacle detection and stop device. 1.5 to 2.5 times is preferable. The amount required to deactivate the obstacle detection and stop device is, for example, 30 to 270 degrees, preferably 60 to 180 degrees.

The number of rotations of the lifting shaft 8 (that is, the number of pulses output from the encoder 8a) from the time when the bottom rail 6 is at the upper limit position until the time when the lifting motor 7 stops is memorized. The lower limit position of the rail 6 is defined (step A8). Note that steps A5 to A7 may be omitted and the position of the bottom rail 6 after step A4 may be set as the lower limit position. Alternatively, step A4 may be omitted, and step A5 may be executed when the rotation stop or overcurrent described above is detected (step A3).

In this embodiment, the lower limit position of the bottom rail 6 is set by a rotation preventing means that can mechanically prevent the rotation of the lifting shaft 8, so compared to the case where an electric switch is used, the space is reduced. Effects include simplification of wiring, cost reduction, improvement in reaction speed, and reduction in maintenance frequency.

Note that the above-mentioned obstacle detection and stop device also operates when the bottom rail 6 collides with an obstacle while descending, and in that case as well, the lifting motor control section 7a controls the setting of the lower limit position of the bottom rail 6. The lifting motor 7 can be controlled in the same way as before.

The advantages of deactivating the obstacle detection and stop device by rotating the lifting motor 7 in the reverse direction are as follows.
If the vehicle is stopped with the obstacle detection/stop device in operation, the load on parts such as the obstacle detection/stop device will be large. Therefore, by rotating the lifting motor 7 in the reverse direction and activating the obstacle detection/stop device, the load on the above-mentioned components can be reduced.

Further, in a state in which the obstacle detection and stop device is activated when setting the lower limit position, both the lifting cord 4 and the ladder cord 3 are loosened. In addition, the slats 5a overlap, resulting in poor design. By rotating the lifting motor 7 in the opposite direction and winding up the lifting cord 4 a little, it is possible to eliminate the slack in the lifting cord 4 and the ladder cord 3 and the overlap of the slats 5a, thereby improving the design.

Furthermore, when the bottom rail 6 collides with an obstacle and the obstacle detection/stop device is activated, there is a problem in that when the obstacle is removed, the loosened lifting cord will be stretched vigorously. By rotating the lifting motor 7 in the opposite direction and winding up the lifting cord 4 a little, the occurrence of such a problem can be suppressed. Moreover, by canceling the operation of the obstacle detection and stop device after it has been activated, the bottom rail 6 can smoothly resume its descent after the obstacle has been removed.

When the bottom rail 6 is at the lower limit position, the inclination angle of the bottom rail 6 is determined by the state of the ladder cord 3, so when the bottom rail 6 reaches the lower limit position, the bottom rail 6 changes from horizontal to fully closed. Rotate in the direction. However, the bottom rail 6 may not rotate smoothly, and in this case, as shown in FIG. In that case, the slats 5a near the bottom rail 6 also tend to open due to the effect of the bottom rail 6, resulting in poor light shielding properties. Furthermore, at this point, there may be variations in the inclination angle of the slats 5a.

Therefore, in the present embodiment, after the bottom rail 6 reaches the lower limit position, the slat group 5f is rotated in the reverse fully closed direction as shown in FIG. After the slat group 5f is tilted in the direction facing the slat group 5f, the slat group 5f is rotated in the normally fully closed direction, and as shown in FIG. 11, the slat group 5f is again brought into the fully closed state. By performing such an operation, the inclination angle α of the bottom rail 6 is increased, the light blocking performance is improved, and variations in the inclination angle of the slats 5a are reduced. The room side tilted state is preferably a reverse fully closed state. In this case, the inclination angle α of the bottom rail 6 tends to become particularly large.

In addition, in this embodiment, the bottom rail 6 is lowered in the fully closed state, but the bottom rail 6 is in the inclined state on the outside of the room, which is closer to the horizontal state than in the fully closed state (the upper surface of the slat 5a faces the outside of the room). The slat group 5f may be lowered with the slat group 5f tilted in the direction, the bottom rail 6 may be lowered in a horizontal state, or the bottom rail 6 may be lowered with the bottom rail 6 tilted toward the inside of the room. In either case, the light blocking performance can be improved by rotating the bottom rail 6 from the room-inward inclined state to the fully closed state.

(2) Lifting operation When the rising button 14a is pressed from the state shown in Figure 11, the ladder cord 3 is rotated to a horizontal position as shown in Figure 12, and in that state the lifting cord 4 is wound up and bottomed. Rail 6 rises. Like the ladder cord 3, the slat group 5f is in a horizontal state. By placing the slat group 5f in a horizontal state during the ascent, the lifting cord 4b and the warp thread 3a are easily engaged with the notch 5b, and the lateral displacement of the slat 5a during the ascent is suppressed.

Incidentally, since the load of the bottom rail 6 and the slats 5a is applied to the lifting cord 4, the number of slats 5a supported by the lifting cord 4 increases as the bottom rail 6 rises. Therefore, as the bottom rail 6 rises, the tension in the lifting cord 4 increases. Furthermore, as shown in FIGS. 12 and 13, since the lifting cords 4a and 4b are wound around the winding tube 9 in the same direction, the distance between the lifting cords 4a and 4b is shorter as the position is closer to the head box 2. Thus, the slat 5a is sandwiched between the lifting cords 4a and 4b. If the lifting cord 4 is wound up with the slat 5a being sandwiched between the lifting cords 4a and 4b having a large tension, there is a problem that the slat 5a will flap.

Therefore, in this embodiment, as shown in FIG. 13, when lifting the lifting cords 4a and 4b, the slats are moved in a direction that reduces the frictional force between the slat 5a having a predetermined height or more and the lifting cords 4a and 4b. automatically tilted. In other words, when lifting and lifting the lifting cords 4a and 4b, the slats 5a are automatically inclined in a direction that reduces the component force that acts in the direction in which the lifting cords 4a and 4b sandwich the slat 5a that is above a predetermined height. . In this way, when the bottom rail 6 reaches a predetermined height, the ladder cord 3 is rotated to be in an inclined state, and the bottom rail 6 is raised in that state. This prevents the slats 5a from flapping. Since the slat group 5f is in an inclined state like the ladder cord 3, rubbing between the lifting cord 4 and the slat 5a is suppressed. As shown in FIG. 11, the predetermined height is, for example, 0.5H to 0.95H (preferably is a height within the range of 0.6H to 0.9H). The ladder cord 3 may be inclined either towards the inside of the room or towards the outside of the room, but it is preferably inclined towards the outside of the room. In this case, the slat group 5f is inclined so that the notches 5b of the slats 5a included in the slat group 5f face downward, and the lifting cord 4b and the warp threads 3a are likely to be engaged with the notches 5b. It is preferable that the ladder cord 3 is in a normally fully closed state.

Here, a method for setting the upper limit position of the bottom rail 6 will be described using the flowchart of FIG. 17.
First, as described above, when the bottom rail 6 is lifted (step B1), the lifting motor control section 7a rotates the lifting motor 7 so that the lifting shaft 8 rotates in the winding direction of the lifting cord 4. Along with this, the bottom rail 6 rises. As shown in FIG. 14, when the bottom rail 6 rises until the uppermost slat 5a contacts the lower surface 2a of the head box 2, even if an attempt is made to further wind up the lifting cord 4, the slat 5a touches the lower surface 2a of the head box 2. Due to the pressure, the lifting cord 4 cannot be further wound up, and the rotation of the lifting shaft 8 is prevented, and the rotation of the lifting shaft 8 is stopped (step B2). Stopping the rotation of the lifting shaft 8 is detected by the encoder 8a. Furthermore, when the rotation of the lifting shaft 8 is blocked, an overcurrent is generated in the lifting motor 7. When the above rotation stop or overcurrent is detected (step B3), the lifting motor control section 7a stops the lifting motor 7 (step B4). The stopping time of the lifting motor 7 is, for example, 0.1 to 3 seconds.

Next, the lifting motor control unit 7a rotates the lifting motor 7 in the reverse direction by a predetermined amount (that is, rotates it in the direction in which the lifting cord 4 is rewound) (step B5). As a result, the lifting cord 4 is slightly rewound to the state shown in FIG. 7. This relieves the pressure of the slat group 5 against the head box 2 by the bottom rail 6 (step B6). This reduces the creep load. Thereafter, the lifting motor control section 7a stops the lifting motor 7 (step B7), and the height position of the bottom rail 6 in the state shown in FIG. 7 is set to the upper limit position (step B8). The rotation angle when rewinding the lifting cord 4 (that is, the amount of rotation of the lifting motor 7 in reverse rotation) is, for example, 10 to 180 degrees, preferably 30 to 90 degrees, and more preferably 60 degrees. .

Note that step B4 may be omitted and step B5 may be executed when the rotation stop or overcurrent described above is detected (step B3).

Furthermore, either the upper limit position or the lower limit position may be set first. The control unit 16a may perform control so that the lower limit position is subsequently set after the upper limit position is set. As a result, the upper and lower limit positions can be set through a series of operations, making installation easier. Furthermore, the trouble of inputting a setting start button can be saved.

(3) Tilt operation By pressing the normal full close button 14c or the reverse full close button 14d, it is possible to perform a tilt operation (operation for changing the inclination angle) of the slat group 5f. During the lowering or raising operation of the bottom rail in the above-mentioned lowering or raising operation, it is preferable to disable the tilt operation in order to prevent malfunction, and preferably to allow the tilt operation in other states.

The rotation angle of the tilt shaft 11 during the tilt operation can be detected by the encoder 11a, and the rotation of the tilt shaft 11 is stopped when the ladder cord 3 reaches the normal fully closed state or the reverse fully closed state. It has become. On the other hand, if the rotation of the tilt shaft 11 does not stop even if the ladder cord 3 is in the normal fully closed state or the reverse fully closed state due to an abnormality in the encoder 11a, etc., as shown in FIG. 15, the main body of the tilter drum 12 A protrusion 12a protruding radially outward from 12b comes into contact with a protrusion 13a of the support member 13 to prevent further rotation of the tilter drum 12 (an example of a "rotation inhibiting means"). The protrusion 13a is arranged on the vertical line of the tilt axis 11. The projection 12a is configured so as not to climb over the projection 13a. There is a gap between the main body portion 12b and the protrusion 13a.

When the rotation of the tilter drum 12 is prevented, the rotation of the tilt shaft 11 is also prevented, and the rotation of the tilt shaft 11 is stopped. When the tilt shaft 11 stops rotating, the encoder 11a stops outputting pulses, or the encoder 11a starts outputting abnormal waveform current or abnormal waveform voltage, so that the rotation stop of the tilt shaft 11 is detected by the encoder 11a. . Furthermore, when the rotation of the tilt shaft 11 is blocked, an overcurrent occurs in the tilt motor 10. When the above rotation stop or overcurrent is detected, the tilt motor control section 10a stops the tilt motor 10. Such a configuration reliably prevents tilt malfunctions. Furthermore, since the limit angle of inclination of the tilter drum 12 is set by a rotation preventing means that can mechanically prevent the rotation of the tilt shaft 11, space and wiring are reduced compared to the case where an electric switch is used. Effects include simplification, cost reduction, improved reaction speed, and reduced maintenance frequency.

Note that the rotation prevention means for the tilt shaft 11 may be configured such that an arbitrary member that moves with the rotation of the tilt shaft 11 and an arbitrary member that does not move with the rotation of the tilt shaft 11 are brought into contact with each other. good. For example, as shown in FIG. 19, a projection 17a is provided on a connecting member 17 that connects the tilt motor 10 and the tilt shaft 11, and this projection is brought into contact with a locking portion 18a provided on a member 18 fixed to the head box. You can.

(4) Display of operating status It is preferable that the electric horizontal blind 1 is provided with an indicator (not shown) that indicates the operating status. Preferably, the indicator indicates the operating status by turning on or off a light source such as an LED. It is preferable that the indicator is provided at a position that is visible from inside the room. However, since providing an indicator on the front surface of the head box 2 may impair the aesthetic appearance, it is preferable to provide the indicator on the lower surface 2a of the head box 2 (shown in FIG. 11) at a position closer to the inside of the room than the slat group 5. . In this case, there is an advantage that the indicator is easily visible to an operator who is near the electric horizontal blind 1, and that the indicator is not noticeable to a person who is located away from the electric horizontal blind 1. The operating status includes at least one of the following: the bottom rail is descending, reaching the lower limit position, rising, reaching the upper limit position, and tilting.

2. Other Embodiments The present invention can also be implemented in the following embodiments.
- In "(2) Raising operation" of the above embodiment, the bottom rail 6 may be raised in a state where the slat group 5 is not horizontal. Even in this case, when the bottom rail 6 reaches a predetermined height, the ladder cord 3 is rotated so as to increase the inclination angle of the slat group 5, and the bottom rail 6 is raised in that state. It is possible to suppress flapping of 5a. It is preferable that the ladder cord 3 rotates in the positive fully closed direction. Assuming that the inclination angle of the slat 5a with respect to the horizontal plane before reaching a predetermined height as shown in FIG. 18A is α, and the inclination angle of the slat 5a with respect to the horizontal plane after reaching the predetermined height as shown in FIG. 18B is β, It is preferable that α<β and 0≦α.
- In "(2) Raising operation" of the above embodiment, the bottom rail 6 may start to rise with the slat group 5 tilted, and the bottom rail 6 may be raised to the upper limit position in that state. Even with this configuration, when the bottom rail 6 is at a predetermined height or higher, the bottom rail 6 can be raised with the slat group 5 tilted, and the slats 5a are prevented from flapping.
- The inclination angle of "(2) Ascending operation" in the above embodiment may be gradually changed. When the bottom rail 6 reaches a predetermined height,
- In "(2) Ascending operation" of the above embodiment, until the bottom rail 6 reaches a predetermined height, the ladder cord 3 is such that the inclination angle of the top slat 5a is 20 degrees (preferably 10 degrees, more preferably 5 degrees) or less. In this case, lateral displacement of the slats 5a is effectively suppressed. Further, at this time, it is preferable that the slats 5a be inclined toward the outside of the room. In this case, the lifting cord 4b and the warp thread 3a are likely to be engaged with the notch 5b.
- In "(1) Lowering operation" of the above embodiment, if an overcurrent generated in the lifting motor 7 due to rotation prevention of the lifting shaft 8 is detected, or if stopping of rotation of the lifting shaft 8 is detected, the lifting is stopped. The configuration in which the motor 7 is stopped can be applied not only to electric horizontal blinds but also to any electric shielding device (for example, electric pleated screen, electric Roman shade) that raises and lowers the shielding material using a lifting cord and a lifting motor. It is.
- In the above embodiment, the slat 5a is not provided with a through hole, and the lifting cords 4a, 4b are arranged along the edge of the slat 5a. , 4b may be inserted into the through hole. Further, in this case, the through hole may be arranged at a position biased to one side in the front-rear direction of the slat 5a.
- The rotation of the lifting motor 7 may be converted by a gear and transmitted to the tilt shaft 11.

1: Electric horizontal blind 2: Head box 2a: Bottom surface 3: Ladder cord 3a: Warp thread 3b: Weft thread 4: Lifting cord 4a: Lifting cord 4b: Lifting cord 5: Slat group 5a: Slat 5b: Notch 5f: Slat group 6 : Bottom rail 6a : Lowest position 7 : Lifting motor 8 : Lifting shaft 8a : Encoder 9 : Winding tube 10 : Tilt motor 11 : Tilt shaft 11a : Encoder 12 : Tilter drum 12a : Protrusion 12b : Main body part 13 : Support member 13a : Protrusion 14: Operation part 14a: Up button 14b: Down button 14c: Normal full close button 14d: Reverse full close button 14e: Stop button 15: Slat presser H: Horizontal plane α: Inclination angle

Claims (7)

It is an electric horizontal blind,
Equipped with a head box, a ladder cord, a lifting cord, a slat group consisting of multiple tiers of slats, and a bottom rail placed below the slat group,
The ladder cord and the lifting cord are suspended from the head box,
The slat group and the bottom rail are supported by the ladder cord,
The bottom rail can be raised and lowered by the lifting cord,
When the bottom rail reaches a predetermined height during a lifting operation of the bottom rail, the ladder cord rotates so as to increase the inclination angle of the slat group, and the bottom rail rises in that state. Horizontal blinds. The electric horizontal blind according to claim 1,
The electric horizontal blind is rotated in the positive and fully closed direction. The electric horizontal blind according to claim 1 or 2,
In the electric horizontal blind, the ladder cord is in such a state that the inclination angle of the uppermost slat is 20 degrees or less with respect to a horizontal plane until the bottom rail reaches the predetermined height when the bottom rail is raised. The electric horizontal blind according to any one of claims 1 to 3,
When the bottom rail reaches a lower limit position during a lowering operation of the bottom rail, the slat group is rotated so that the slat group changes from a room-inward inclined state in which the slat group is inclined toward the inside of the room from the horizontal to a fully closed state. Electric horizontal blinds. The electric horizontal blind according to claim 4,
The slat group is in the fully closed state until the bottom rail reaches the lower limit position,
When the bottom rail reaches the lower limit position, the slat group rotates from the normally fully closed state to the room side tilted state, and then the slat group changes from the room side tilted state to the normally fully closed state. An electric horizontal blind that rotates to The electric horizontal blind according to claim 4 or 5,
The electric horizontal blind is in a reverse fully closed state when it is tilted toward the inside of the room. The electric horizontal blind according to any one of claims 1 to 6,
The lifting cord includes first and second lifting cords,
The first and second lifting cords are arranged on opposite sides of the slat group, and the electric horizontal blinds are arranged on opposite sides of the slat group.