JP2020186635A - Electric horizontal blind - Google Patents

Abstract

To provide an electric shielding device allowing reduction of space, simplification of wiring, cost reduction, improved reaction speed and reduction of maintenance frequency.SOLUTION: The electric horizontal blind comprises a tilt shaft 11, a motor 10, a controller and rotation prevention means, the controller controls an operation of the motor 10, the tilt shaft 11 is configured to rotate along with rotation of the motor, the rotation prevention means is configured to be capable of mechanically preventing the tilt shaft 11 from rotating and when an abnormal value of an output of an encoder 11a for detecting an abnormal value of a motor current for driving the motor 10 during rotation of the tilt shaft 11 or a rotation of the tilt shaft is detected, the controller determines whether the abnormal value is due to a mechanical rotation prevention or not.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electric horizontal blind.

In the electric horizontal blind of Patent Document 1, the slat and the bottom rail are moved up and down by winding or rewinding the lifting cord to the winding cylinder by using the lifting motor, and the tilt angle of the slat is determined by using the tilt motor. It is possible to adjust.

Japanese Unexamined Patent Publication No. 10-30385

In Patent Document 1, the rotation origin of the slat is set by using the slat angle detection device, and the operation of the tilt motor is automatically stopped when the slat is rotated to the rotation end point based on the rotation origin. It is set to do.

However, the configuration of Cited Document 1 has problems that space is increased, wiring is complicated, and cost is increased, maintenance is required, and the reaction speed is not good.

The present invention has been made in view of such circumstances, and provides an electric horizontal blind capable of reducing space, simplifying wiring, reducing costs, improving reaction speed, and reducing maintenance frequency.

According to the present invention, the electric horizontal blind is provided with a tilt shaft, a motor, a control unit, and rotation blocking means, the control unit controls the operation of the motor, and the tilt shaft is the motor. The rotation blocking means is configured to mechanically block the rotation of the tilt shaft, and the control unit drives the motor during the rotation of the tilt shaft. An electric horizontal blind is provided that detects an abnormal value of the motor current or an abnormal value of the output of the encoder that detects the rotation of the tilt shaft, and determines whether or not the abnormal value is due to mechanical rotation prevention. Rotate.

In the configuration of the present invention, since the rotation blocking means capable of mechanically blocking the rotation of the tilt shaft is used, the above-mentioned problems are achieved. Further, since it is determined whether or not the abnormal value detected by the control unit is due to mechanical rotation prevention, it is possible to appropriately stop the motor or the like based on the determination result.

Hereinafter, various embodiments of the present invention will be illustrated. The various embodiments shown below can be combined with each other.
Preferably, the electric horizontal blind is provided with a tilt shaft, a motor, a control unit, and rotation blocking means, the control unit controls the operation of the motor, and the tilt shaft controls the rotation of the motor. The rotation blocking means is configured to mechanically block the rotation of the tilt shaft, and when the control unit detects an abnormal value of the motor current for driving the motor, the rotation blocking means is configured to rotate with the rotation. It is an electric horizontal blind that stops the motor.
Preferably, the electric horizontal blind is the electric horizontal blind, which comprises a rotating body and a fixed object which does not move with respect to the head box, so that the rotating body rotates with the rotation of the motor. The rotating body has a deformed cross section, and when a protrusion provided on the rotating body comes into contact with the fixed object as the rotating body rotates, the rotation of the tilt shaft is prevented and the tilt occurs. It is an electric horizontal blind that is configured to stop the rotation of the shaft.
Preferably, it is the electric horizontal blind described above, wherein a ladder cord is connected to the rotating body.

It is a perspective view of the electric horizontal blind 1 of the 1st Embodiment of this invention. It is an enlarged view of the area A in FIG. It is an enlarged view of the area B in FIG. FIG. 4A is a plan view schematically showing the inside of the head box 2, and FIG. 4B is an enlarged view of a region B in FIG. 4A. It is a functional block diagram of the control unit 16a. It is a front view which shows the structure of the operation part 14. It is a schematic view of the electric horizontal blind 1 in the state where the bottom rail 6 is in the upper limit position, as seen from the right side surface. It is a schematic diagram which shows the state in the process of lowering the bottom rail 6 from the state of FIG. It is a schematic diagram which shows the state which further lowered the bottom rail 6 from the state of FIG. 8 and reached the lower limit position. It is a schematic diagram which shows the state of FIG. 9 or the state after rotating the slat group 5f so that the slat group 5f is inclined inside the room. It is a schematic diagram which shows the state after rotating the slat group 5f so that the slat group 5f becomes a fully closed state from the state of FIG. It is a schematic diagram which shows the state in the process of raising the bottom rail 6 from the state of FIG. It is a schematic diagram which shows the state at the time when the bottom rail 6 reaches a predetermined height near the upper limit from the state of FIG. It is a schematic diagram which shows the state after raising the bottom rail 6 from the state of FIG. 13 until the uppermost slat 5a comes into contact with the lower surface 2a of the head box 2. It is sectional drawing of a support member 13 and a tilter drum 12. It is a flowchart which shows the lower limit position setting method of the bottom rail 6. It is a flowchart which shows the upper limit position setting method of the bottom rail 6. FIG. 18A shows the slat 5a in the state before reaching the predetermined height, and FIG. 18B shows the slat 5a in the state after reaching the predetermined height. A modified example of the rotation preventing means of the tilt shaft 11 is shown, 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 with reference to the drawings. The various embodiments shown below can be combined with each other.

1. 1. First Embodiment The electric horizontal blind 1 of the 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, an elevating cord 4, a slat group 5, and a bottom rail 6. The ladder cord 3 and the elevating cord 4 are suspended from the head box 2.

The slat group 5 and the bottom rail 6 are supported by a ladder cord 3. The ladder cord 3 is configured by providing a plurality of stages of a pair of weft threads 3b between a pair of warp threads 3a. A slat 5a is inserted between each pair of weft threads 3b. The slat group 5 is composed of a plurality of stages of slat 5a. In the uppermost slat 5a, the weft thread 3b is fixed to the slat 5a by the slat retainer 15. In the following description, when distinction is necessary, the slat group 5 is composed of slat 5a (floating slat) that is not stacked on the bottom rail 6 (in other words, is 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 in the lower limit position, the slat group 5 and the slat group 5f coincide with each other.

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 elevating cord 4 are connected to the bottom rail 6. The bottom rail 6 can be raised and lowered by the lifting cord 4. The elevating cord 4 is arranged along the warp thread 3a. The elevating cord 4 includes an elevating cord 4a arranged inside the room as shown in FIG. 2 and an elevating cord 4b arranged outside the room as shown in FIG. The elevating cords 4a and 4b are arranged along the edge of the slats 5a, and are arranged on opposite sides of the slats 5a. The elevating cords 4a and 4b are maintained at positions shifted in the front-rear direction by the edges of the slats 5a.

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

The number and arrangement of the elevating cords 4a and 4b and the notch 5b can be changed as appropriate. For example, the elevating cords 4a and 4b may be inserted between the pair of weft threads 3b at the positions corresponding to the slats 5a of the third and subsequent stages, or may not be inserted between the pair of weft threads 3b. Good.

As shown in FIG. 4, in the head box 2, an elevating motor (an example of a "motor") 7, an elevating shaft (an example of a "drive shaft") 8, a take-up cylinder 9, and a tilt motor ("motor") are included. An example) 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) are provided. The number of take-up cylinders 9 is the same as that of the elevating cord 4. The same number of tilter drums 12 as the ladder code 3 are provided. The rotation angles of the elevating shaft 8 and the tilt shaft 11 can be detected by the encoders 8a and 11a. Further, the magnitudes of the drive currents of the elevating motor 7 and the tilt motor 10 can be detected by a current detection unit provided on the control board. The take-up tube 9 and the tilter drum 12 are rotatably supported by the 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 into DC power in the power supply board. The DC power drives members such as an elevating motor 7, a tilt motor 10, a control board, and encoders 8a and 11a. A program required for control is recorded on the control board, and the electric horizontal blind 1 operates according to this program. By such a program, the control unit 16a having the configuration shown in FIG. 5 is realized. The control unit 16a includes an elevating motor control unit (an example of a "motor control unit") 7a that controls the operation of the elevating 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.

The elevating shaft 8 rotates with the rotation of the elevating motor 7, and the take-up cylinder 9 rotates with the rotation of the elevating shaft 8. The upper end of the elevating cord 4 is connected to the take-up cylinder 9, and the elevating cord 4 is wound up or rewound on the take-up cylinder 9 as the take-up cylinder 9 rotates, so that the bottom rail 6 moves up and down. ..

The tilt shaft 11 rotates with the rotation of the tilt motor 10, and the tilter drum 12 rotates with the rotation of the tilt shaft 11. In the ladder cord 3, the upper ends of the pair of warp threads 3a are connected to the tilter drum 12. Along with the rotation of the tilter drum 12, the ladder cord 3 also rotates (in another expression, the pair of warp threads 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 by using the operation unit 14 shown in FIG. The operation unit 14 can communicate with the control unit provided on the control board by wire or wirelessly. The operation unit 14 includes an ascending button 14a, a descending button 14b, a forward fully closed button 14c, a reverse fully closed 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 the lower button 14b. By pressing the fully closed button 14c, the slat group 5f can be rotated in the fully closed direction. By pressing the reverse fully closed button 14d, the slat group 5f can be rotated in the reverse fully closed direction. Each operation can be stopped by pressing the stop button 14e. Fully closed is a state in which the slat group 5f is maximally inclined in the direction in which the upper surface of the slat 5a faces the outside of the room. The reverse fully closed state is a state in which the slat group 5f is maximally inclined in the direction in which the upper surface of the slat 5a faces the inside of the room.

Since the inclined state of the slat group 5f is determined by the state of the ladder code 3, in the following description, the ladder code 3 is set so that the slat group 5f is in the fully closed state, the reverse fully closed state, the horizontal state, and the inclined state. The rotated state of the ladder cord 3 is referred to as a fully closed state, a reverse fully closed state, a horizontal state, and an inclined state, respectively.

1-2. Operation of Electric Horizontal Blind 1 The operation of the electric horizontal blind 1 will be described with reference to FIGS. 7 to 17. In FIGS. 7 to 14, for convenience of illustration, the ladder code 3 and the elevating code 4 are not shown.

(1) Lowering operation For the sake of explanation, the state where the bottom rail 6 is in the upper limit position is set as the initial state as shown in FIG. In this state, all the slats 5a of the slats group 5 are stacked on the bottom rail 6.

When the lowering button 14b is pressed from the state of FIG. 7, the ladder cord 3 is rotated so as to be in the fully closed state, the elevating cord 4 is rewound, and the bottom rail 6 starts descending, as shown in FIG. To do. As the bottom rail 6 descends, the slats 5a move away from the bottom rail 6 in order from the top and are supported by the weft threads 3b. Until the bottom rail 6 reaches the lower limit position, the warp 3a of the ladder cord 3 is loose in the vicinity of the bottom rail 6, and the elevating cord 4 bears the total load of the bottom rail 6 and the slats 5a on the bottom rail 6. It is ready to receive. Therefore, even when the ladder cord 3 is in the fully closed state, the bottom rail 6 and the slats 5a stacked on the bottom rail 6 are horizontal. On the other hand, the slat group 5f is in a fully closed state as in the ladder code 3.

Here, a method of setting the lower limit position of the bottom rail 6 will be described with reference to the flowchart of FIG.
First, as described above, when the bottom rail 6 is lowered (step A1), the lifting motor control unit 7a rotates the lifting motor 7 so that the lifting shaft 8 rotates in the rewinding direction of the lifting cord 4. Along with this, the elevating cord 4 is rewound and the bottom rail 6 starts descending. When the bottom rail 6 is lowered until the warp 3a is no longer loosened, the warp 3a receives the load of the bottom rail 6 and the load applied to the elevating cord 4 is reduced. An obstacle detection / stopping device (an example of "rotation blocking means") having a clutch having the same configuration as that of JP-A-2005-179994 is incorporated in the take-up cylinder 9, and the rotation of the elevating shaft 8 is taken up through the clutch. It is transmitted to the cylinder 9. Then, when the load applied to the elevating cord 4 is reduced, a difference occurs in the rotation speeds of the elevating shaft 8 and the take-up cylinder 9, and the obstacle detection / stopping device is activated to prevent the elevating shaft 8 from rotating and elevate. The rotation of the shaft 8 is stopped (step A2). The rotation stop of the elevating shaft 8 is detected by the encoder 8a. Further, when the rotation of the elevating shaft 8 is blocked, an overcurrent occurs in the elevating motor 7. When the above rotation stop or overcurrent is detected (step A3), the elevating motor control unit 7a stops the elevating motor 7 (step A4). The stop time of the elevating motor 7 is, for example, 0.1 to 3 seconds.

Next, the elevating motor control unit 7a rotates the elevating motor 7 in the reverse direction by a predetermined amount (that is, rotates in the winding direction of the elevating cord 4) (step A5). Since the obstacle detection / stopping device is configured so that the operation is released when the elevating shaft 8 is rotated in the reverse direction, the operation of the obstacle detection / stopping device is released as the elevating motor 7 rotates in the reverse direction (step). A6), after that, the elevating motor control unit 7a stops the elevating motor 7 (step A7). The amount of reverse rotation of the elevating motor 7 may be equal to or greater than the amount required to release the operation of the obstacle detection / stopping device, and is, for example, 1 to 3 times the amount required to release the operation of the obstacle detection / stopping device. It is preferably 1.5 to 2.5 times. The amount required to release the operation of the obstacle detection / stopping device is, for example, 30 to 270 degrees, preferably 60 to 180 degrees.

The rotation speed of the elevating shaft 8 (that is, the number of pulses output from the encoder 8a) from the time when the bottom rail 6 is in the upper limit position to the time when the elevating motor 7 is stopped is stored, and after that, the bottom is determined by this rotation speed. 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. Further, step A4 may be omitted, and step A5 may be executed when the above-mentioned rotation stop or overcurrent is detected (step A3).

In the present embodiment, the lower limit position of the bottom rail 6 is set by the rotation blocking means capable of mechanically blocking the rotation of the elevating shaft 8, so that the space is reduced as compared with the case of using an electric switch. The effects such as simplification of wiring, cost reduction, improvement of reaction speed, and reduction of maintenance frequency are achieved.

The above-mentioned obstacle detection / stopping device also operates when the bottom rail 6 collides with an obstacle during descent, and even in that case, the elevating motor control unit 7a sets the lower limit position of the bottom rail 6. As in the case, the elevating motor 7 can be controlled.

The advantages of rotating the elevating motor 7 in the reverse direction to release the operation of the obstacle detection / stopping device are as follows.
If the obstacle detection / stopping device is stopped while it is activated, the load on parts such as the obstacle detection / stopping device is large. Therefore, the load on the above-mentioned parts can be reduced by rotating the elevating motor 7 in the reverse direction to operate the obstacle detection / stopping device.

Further, in the state where the obstacle detection / stopping device is operated when the lower limit position is set, both the elevating cord 4 and the ladder cord 3 are loosened. In addition, the slats 5a overlap, resulting in poor design. By rotating the elevating motor 7 in the reverse direction and winding up the elevating cord 4 a little, it is possible to eliminate the slack of the elevating cord 4 and the ladder cord 3 and the overlap of the slats 5a and improve the design.

Further, when the bottom rail 6 collides with an obstacle and the obstacle detection / stopping device is activated, if the obstacle is removed, there is a problem that the loose lifting cord is stretched vigorously. By rotating the elevating motor 7 in the reverse direction and winding the elevating cord 4 a little, the occurrence of such a problem can be suppressed. Further, by releasing the operation of the obstacle detection / stopping device after the operation of the obstacle detection / stopping device, the lowering of the bottom rail 6 can be smoothly restarted after the obstacle is removed.

When the bottom rail 6 is in the lower limit position, the inclination angle of the bottom rail 6 is determined by the state of the ladder code 3. Therefore, when the bottom rail 6 reaches the lower limit position, the bottom rail 6 is fully closed from the horizontal. Rotate in the direction. However, the bottom rail 6 may not rotate smoothly. In this case, as shown in FIG. 9, the inclination angle α of the bottom rail 6 (inclination angle with respect to the horizontal plane H; the same applies hereinafter) may not be sufficiently large. In that case, the slat 5a in the vicinity of the bottom rail 6 also tends to open due to the influence of the bottom rail 6, and the light-shielding property deteriorates. Further, at this point, the inclination angle of the slats 5a may vary.

Therefore, in the present embodiment, after the bottom rail 6 reaches the lower limit position, as shown in FIG. 10, the slat group 5f is rotated in the reverse fully closed direction to incline the inside of the room (the upper surface of the slat 5a is inside the room). The slat group 5f is tilted in the direction toward the direction), and then the slat group 5f is rotated in the fully closed direction to be in the fully closed state again as shown in FIG. By performing such an operation, the inclination angle α of the bottom rail 6 is increased, the light-shielding property is improved, and the variation in the inclination angle of the slat 5a is reduced. The room inward inclined state is preferably a reverse fully closed state. In this case, the inclination angle α of the bottom rail 6 tends to be particularly large.

Further, in the present embodiment, the bottom rail 6 is lowered in the fully closed state, but the bottom rail 6 is tilted outside the room 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 in a horizontal state), the bottom rail 6 may be lowered in a horizontal state, or the bottom rail 6 may be lowered in a state of being tilted inside the room. In any case, the light-shielding property can be improved by rotating the bottom rail 6 from the inclined state inside the room to the fully closed state.

(2) Lifting operation When the rising button 14a is pressed from the state shown in FIG. 11, the ladder cord 3 is rotated so as to be in a horizontal state as shown in FIG. 12, and the lifting cord 4 is wound up in that state to bottom. Rail 6 rises. The slat group 5f is in a horizontal state as in the ladder code 3. By making the slat group 5f horizontal when ascending, the elevating cord 4b and the warp 3a are easily engaged with the notch 5b, and lateral displacement of the slat 5a when ascending is suppressed.

By the way, since the load of the bottom rail 6 and the slats 5a is applied to the elevating cord 4, the number of slats 5a supported by the elevating cord 4 increases as the bottom rail 6 rises. Therefore, the tension of the elevating cord 4 increases as the bottom rail 6 rises. Further, as shown in FIGS. 12 to 13, since the elevating cords 4a and 4b are wound around the winding cylinder 9 in the same direction, the closer the position is to the head box 2, the shorter the distance between the elevating cords 4a and 4b is. Therefore, the slats 5a are sandwiched between the elevating cords 4a and 4b. Then, if the elevating cord 4 is wound while the slat 5a is sandwiched between the elevating cords 4a and 4b having a large tension, there is a problem that the slat 5a flutters.

Therefore, in the present embodiment, as shown in FIG. 13, when the elevating cords 4a and 4b are pulled up and raised, the slat is moved in a direction in which the frictional force between the slats 4a having a predetermined height or higher and the elevating cords 4a and 4b is reduced. It is tilted automatically. In other words, when the elevating cords 4a and 4b are pulled up and raised, the slat 5a is automatically tilted in a direction that reduces the component force acting in the direction in which the elevating cords 4a and 4b sandwich the slat 4a having a predetermined height or higher. .. In this way, when the bottom rail 6 reaches a predetermined height, the ladder cord 3 is rotated so as to be in an inclined state, and the bottom rail 6 is raised in that state. This prevents the slats 5a from fluttering. Since the slat group 5f is in an inclined state like the ladder cord 3, rubbing between the elevating 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 0.5H to 0.95H), where H is the height from the lowest position 6a when the bottom rail 6 is in the lower limit position to the lower surface 2a of the headbox 2. Is a height in the range of 0.6H to 0.9H). The ladder code 3 may be inclined to either the inside of the room or the outside of the room, but it is preferable to incline it to the outside of the room. In this case, the slat group 5f is tilted so that the notch 5b of the slat group 5a included in the slat group 5f faces downward, and the elevating cord 4b and the warp 3a are likely to be engaged with the notch 5b. The ladder code 3 is preferably in a fully closed state.

Here, a method of setting the upper limit position of the bottom rail 6 will be described with reference to the flowchart of FIG.
First, as described above, when the bottom rail 6 is lifted (step B1), the lift motor control unit 7a rotates the lift motor 7 so that the lift shaft 8 rotates in the winding direction of the lift 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 abuts on the lower surface 2a of the head box 2, the slat 5a touches the lower surface 2a of the head box 2 even if the lifting cord 4 is to be further wound. Being pressed, the elevating cord 4 cannot be further wound up, the rotation of the elevating shaft 8 is blocked, and the rotation of the elevating shaft 8 is stopped (step B2). The rotation stop of the elevating shaft 8 is detected by the encoder 8a. Further, when the rotation of the elevating shaft 8 is blocked, an overcurrent occurs in the elevating motor 7. When the above rotation stop or overcurrent is detected (step B3), the elevating motor control unit 7a stops the elevating motor 7 (step B4). The stop time of the elevating motor 7 is, for example, 0.1 to 3 seconds.

Next, the elevating motor control unit 7a rotates the elevating motor 7 in the reverse direction by a predetermined amount (that is, rotates in the rewinding direction of the elevating cord 4) (step B5). As a result, the elevating cord 4 is slightly rewound to the state shown in FIG. As a result, the pressing of the slat group 5 against the head box 2 by the bottom rail 6 is relaxed (step B6). This reduces the creep load. After that, the elevating motor control unit 7a stops the elevating motor 7 (step B7), and the height position of the bottom rail 6 in the state of FIG. 7 is set to the upper limit position (step B8). The rotation angle at the time of rewinding the elevating cord 4 (that is, the amount of rotation of the elevating motor 7 in the 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 above rotation stoppage or overcurrent is detected (step B3).

In addition, either the upper limit position or the lower limit position may be set first. The control unit 16a may control to set the lower limit position after setting the upper limit position. As a result, the upper and lower limit positions can be set by a series of operations, which facilitates the installation work. Furthermore, the trouble of inputting the setting start button can be saved.

(3) Tilt operation By pressing the forward fully closed button 14c or the reverse fully closed button 14d, the tilt operation (operation of changing the tilt angle) of the slat group 5f can be performed. During the lowering or raising operation of the bottom rail in the above-mentioned lowering operation or raising operation, it is preferable to disable the tilt operation in order to prevent malfunction, and it is preferable to enable 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 code 3 is in the 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 code 3 is in the fully closed state or the reverse fully closed state due to an abnormality of the encoder 11a or the like, as shown in FIG. 15, the main body of the tilter drum 12 A protrusion 12a projecting radially outward from 12b abuts on the protrusion 13a of the support member 13 to prevent further rotation of the tilter drum 12 (an example of "rotation prevention means"). The protrusion 13a is arranged on the vertical line of the tilt shaft 11. The protrusion 12a is configured so as not to get over the protrusion 13a. There is a gap between the main body 12b and the protrusion 13a.

When the rotation of the tilter drum 12 is blocked, the rotation of the tilt shaft 11 is also blocked, and the rotation of the tilt shaft 11 is stopped. When the tilt shaft 11 stops rotating, the encoder 11a stops outputting a pulse, or the encoder 11a outputs an abnormal waveform current or an abnormal waveform voltage. Therefore, the rotation stop of the tilt shaft 11 is detected by the encoder 11a. .. Further, 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 unit 10a stops the tilt motor 10. With such a configuration, the malfunction of the tilt is surely prevented. Further, since the limit angle of the tilt of the tilter drum 12 is set by the rotation blocking means capable of mechanically blocking the rotation of the tilt shaft 11, the space can be reduced and the wiring can be reduced as compared with the case of using an electric switch. The effects such as simplification, cost reduction, reaction speed improvement, and maintenance frequency reduction are achieved.

The rotation preventing means of the tilt shaft 11 may be configured so 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 protrusion 17a is provided on the connecting member 17 that connects the tilt motor 10 and the tilt shaft 11, and the protrusion is brought into contact with the locking portion 18a provided on the member 18 fixed to the head box. You may.

(4) Display of Operating Status It is preferable that the electric horizontal blind 1 is provided with an indicator (not shown) indicating the operating status. The indicator preferably indicates the operating status by turning on / off a light source such as an LED. The indicator is preferably provided at a position visible from the inside of the room. However, since providing the indicator on the front surface of the head box 2 may spoil the aesthetic appearance, it is preferable to provide the indicator on the lower surface 2a (shown in FIG. 11) of the head box 2 at a position inside the room rather than the slat group 5. .. In this case, there is an advantage that the indicator is easily visible to the operator near the electric horizontal blind 1, and the indicator is not conspicuous to the person who is located away from the electric horizontal blind 1. Examples of the operating state include at least one of the bottom rail being lowered, reaching the lower limit position, rising, reaching the upper limit position, and tilting.

2. 2. Other Embodiments The present invention can also be implemented in the following embodiments.
-In the "(2) raising operation" of the above embodiment, the bottom rail 6 may be raised while 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 to raise the slat. It is possible to suppress the fluttering of 5a. The rotation of the rudder cord 3 is preferably a rotation in the forward / fully closed direction. As shown in FIG. 18A, let α be the inclination angle of the slat 5a with respect to the horizontal plane before reaching the predetermined height, and let β be the inclination angle of the slat 5a after reaching the predetermined height with respect to the horizontal plane as shown in FIG. 18B. It is preferable that α <β and 0 ≦ α.
-In the "(2) ascending operation" of the above embodiment, the bottom rail 6 may be started to ascend in a state where the slat group 5 is tilted, and the bottom rail 6 may be raised to the upper limit position in that state. Even in such a form, when the bottom rail 6 is at a predetermined height or higher, the bottom rail 6 can be raised in a state where the slat group 5 is tilted, and the slat 5a is suppressed from fluttering.
-The tilt angle of "(2) Ascending operation" of the above embodiment may be gradually changed. When the bottom rail 6 reaches a predetermined height,
-In the "(2) ascending operation" of the above embodiment, until the bottom rail 6 reaches a predetermined height, the inclination angle of the uppermost slat 5a of the ladder code 3 is 20 degrees (preferably) with respect to the horizontal plane. It is preferably in a state of 10 degrees, more preferably 5 degrees) or less. In this case, lateral displacement of the slats 5a is effectively suppressed. At this time, the slats 5a are preferably inclined to the outside of the room. In this case, the elevating cord 4b and the warp 3a are likely to be engaged with the notch 5b.
-In the "(1) lowering operation" of the above embodiment, when an overcurrent generated in the elevating motor 7 due to the rotation prevention of the elevating shaft 8 is detected, or when the rotation stop of the elevating shaft 8 is detected, the elevating and lowering is performed. The configuration in which the motor 7 is stopped can be applied not only to the electric horizontal blind but also to any electric shielding device (for example, electric pleated screen, electric roman shade) that raises and lowers the shielding material by using the elevating cord and the elevating motor. Is.
In the above embodiment, the slat 5a is not provided with a through hole, and the elevating cords 4a and 4b are arranged along the edge of the slat 5a. However, the slat 5a is provided with a through hole and the elevating cord 4a is provided. , 4b may be inserted through 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 elevating 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 code 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: Minimum position 7: Lifting motor 8: Lifting shaft 8a: Encoder 9: Winding cylinder 10: Tilt motor 11: Tilt shaft 11a: Encoder 12: Horizontal drum 12a: Protrusion 12b: Main body 13: Support member 13a: Protrusion 14: Operation unit 14a: Up button 14b: Down button 14c: Forward fully closed button 14d: Reverse fully closed button 14e: Stop button 15: Slat presser H: Horizontal plane α: Tilt angle

Claims (4)

It ’s an electric horizontal blind,
It is equipped with a tilt shaft, a motor, a control unit, and rotation blocking means.
The control unit controls the operation of the motor and
The tilt shaft is configured to rotate with the rotation of the motor.
The rotation blocking means is configured to be able to mechanically block the rotation of the tilt shaft.
When the control unit detects an abnormal value of the motor current that drives the motor or an abnormal value of the output of the encoder that detects the rotation of the tilt shaft during the rotation of the tilt shaft, the abnormal value mechanically prevents rotation. An electric horizontal blind that determines whether or not it is due to. It ’s an electric horizontal blind,
It is equipped with a tilt shaft, a motor, a control unit, and rotation blocking means.
The control unit controls the operation of the motor and
The tilt shaft is configured to rotate with the rotation of the motor.
The rotation blocking means is configured to be able to mechanically block the rotation of the tilt shaft.
The control unit is an electric horizontal blind that stops the motor when it detects an abnormal value of the motor current that drives the motor. The electric horizontal blind according to claim 1 or 2.
The electric horizontal blind comprises a rotating body and a fixed object that does not move with respect to the headbox.
The rotating body is configured to rotate with the rotation of the motor.
The rotating body has a modified cross section and has a modified cross section.
When the protrusions provided on the rotating body come into contact with the fixed object as the rotating body rotates, the rotation of the tilt shaft is blocked and the rotation of the tilt shaft is stopped. Horizontal blind. The electric horizontal blind according to claim 3.
An electric horizontal blind to which a ladder cord is connected to the rotating body.