JP4801112B2 - blind - Google Patents

Description

  The present invention relates to a blind provided with a slat adjusting device that supports a plurality of slats in an aligned state by a ladder cord suspended from a head box and rotates the slats by relatively moving up and down the vertical cords before and after the ladder cord. .

  2. Description of the Related Art Conventionally, a blind is known in which a slat adjusting device is driven to move a vertical code of a ladder cord relatively up and down, thereby rotating a slat placed on a middle cord of the ladder cord. The slat adjusting device includes, for example, a rotating drum that can rotate integrally with a shaft that is rotatably supported in the head box, and the upper ends of the vertical cords before and after the ladder cord are respectively attached to the rotating drums. A fixed one is known. By rotating the shaft and rotating the rotating drum, the vertical cords before and after the ladder cord are relatively moved up and down to rotate the slats. Further, the slat adjusting device includes a lifting drum that can rotate integrally with the shaft, and the upper end of the lifting cord is fixed to the lifting drum. And by rotating a shaft and rotating a raising / lowering drum, a raising / lowering cord can be wound or unwound and a slat can be raised / lowered. As a method of rotating the shaft, there are a manual type in which an operation cord wound around a pulley provided at one end of the shaft is manually operated, and an electric type in which a motor connected to the shaft is driven.

  In this type of conventional blind, the rotational speed of the rotating drum of the slat adjusting device is constant, and therefore the slat also rotates at a substantially constant speed. That is, in the case of the electric type, the rotational speed of the motor is constant. In the case of the manual type, the speed transmission ratio of (ladder code moving speed) / (operation code operating speed) is constant, If the operation speed is constant, the ladder code moves at a constant movement speed, and the movement speed is set to a relatively high speed. One reason for this is that the rotational speed of the shaft is determined in accordance with the lifting speed so that the slats can be lifted and lowered quickly.

  However, when the shaft is rotated at a high speed, the slat cannot follow the vertical movement of the ladder cord vertical cord, and one edge of the slat is caught by a part of the ladder cord vertical cord, and the slat rotates. There is a problem that it may not be possible. Such problems are caused by the fact that the width of the slat is larger than the longitudinal distance between the vertical cords before and after the ladder cord, and the center of gravity of the slat is not at the midpoint between the vertical cords before and after the ladder cord. This is likely to occur with blinds such as those described in. When this phenomenon is described with reference to FIG. 8, 1 is a slat, 2 is a ladder cord, and the slat 1 shown in FIG. When the 2a is moved up and down relatively, the center of gravity of the slat 1 is closer to the front edge side where the slat 1 protrudes from the ladder cord than the midpoint between the vertical cords 2a and 2a before and after the ladder cord. Therefore, it is difficult for the rear edge of the slat 1 to rotate downward, and as shown in (b), the rear edge of some slats 1 is caught in the middle of the vertical cord 2a on the rear side of the ladder cord 2. End up. Therefore, there is a problem that the slats 1 are not in a desired rotational state and the rotations of a large number of slats 1 are not aligned.

JP 2002-38849 A

  The problem to be solved by the present invention is to provide a blind capable of aligning a large number of slats in a desired rotational state in the rotational movement of the slats.

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a plurality of slats are supported in an aligned state by a ladder cord suspended from the head box, and the vertical cords before and after the ladder cord can be moved up and down relatively. And a blind including a slat adjustment device that rotates the slats by relatively moving the vertical cords up and down relative to each other.
The slat adjustment device can change the relative speed of the front and rear vertical cords, until a predetermined time elapses from the start of rotation of the slats or until it rotates to a predetermined angle, or Predetermined when the slat is in a predetermined angular range that is at least part of the angular range between the angle at which the slat is fully closed and the angle at which the slat is horizontal at the start of rotation. The relative speed of the front and rear vertical cords is set to a low speed until a predetermined time elapses, until a predetermined angle is rotated, or until the predetermined angle range is exceeded. Thereafter, it is characterized by higher speed.

  According to the present invention, when the slat rotates, the moving speed of the vertical cord can be changed. Therefore, in a situation where the slat may be caught by the ladder cord, the slat is reduced by rotating the slat at a low speed. You can follow the ladder code. As a result, the angles of the slats can be made uniform.

  In addition, in order to raise and lower the slat, by changing the rotation speed at the time of rotation of the slat at the start of the vertical movement of the lifting code, the slat can sufficiently follow the ladder code at low speed. By reducing the speed and increasing the speed as much as possible at the time of high speed, the time required for operations such as raising and lowering the slats can be shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments do not limit the present invention.

  FIG. 1 is a plan view of a blind according to an embodiment of the present invention. In the figure, the blind 10 has a head box 12, and a plurality of ladder cords 14 are suspended from the head box 12 at intervals in the width direction, and a plurality of slats 16 are aligned by the ladder cords 14. Supported by

  As shown in FIG. 2, each ladder cord 14 suspended from the head box 12 is provided with a plurality of vertical cords 14a, 14a extending in the vertical direction and spaced apart in the vertical direction so that the vertical cords 14a , 14a, and a slat 16 is placed on the middle cord 14c. The upper ends of the front and rear vertical cords 14 a that serve as one end of the ladder cord 14 are connected to a slat adjustment device 22 disposed in the head box 12, and the lower ends that serve as the other ends are connected to a bottom rail 18 provided below the slat 16. Connected.

  In this example, the width of the slat 16 is set between the vertical cords 14a and 14a before and after the ladder cord 14 so that the airtightness when the slat 16 is fully closed can be enhanced as shown in FIGS. The slit 16a is formed at one edge (front edge) of the slat 16, and the vertical cord 14a on the front side of the ladder cord 14 is inserted into the slit 16a. As a result, the slat 16 The front edge protrudes from the vertical cord 14 a on the front side of the ladder cord 14, and the position of the center of gravity of the slat 16 is biased to the front side from the midpoint between the vertical cords 14 a and 14 a before and after the ladder cord 14. ing. However, the present invention is not limited to such a slat 16, and the present invention can be similarly applied to a normal slat in which the center of gravity of the slat is located at the center between the vertical cords 14a and 14a before and after the ladder cord 14. Yes.

  A plurality of elevating cords 20 are suspended from the head box 12 at intervals in the width direction, and the upper end of the elevating cord 20 is connected to a slat adjusting device 22 disposed in the head box 12 and the lower end thereof. Is coupled to the bottom rail 18. The slat 16 is provided with a lifting / lowering cord insertion hole 16b (see FIG. 3), and the lifting / lowering cord 20 is inserted through the lifting / lowering cord insertion hole 16b of each slat 16.

  The slat adjustment device 22 includes a shaft 24 that is rotatably supported in the head box 12, a motor 26 that rotationally drives the shaft 24, a plurality of rotary drums 28 and a lifting drum 30 that are provided on the shaft 24, and control. Circuit 32. The upper ends of the vertical cords 14 a before and after each ladder cord 14 are fixed to each rotary drum 28. An upper end of the lifting / lowering cord 20 is fixed to the lifting / lowering drum 30, and the lifting / lowering cord 20 can be wound and unwound on the lifting / lowering drum 30. The elevating drum 30 is configured to rotate integrally with the shaft 24, or idles from a rotation start of the shaft 24 to a predetermined angle, and thereafter rotates integrally with the shaft 24. On the other hand, the rotating drum 28 rotates integrally with the shaft 24 up to a predetermined angle. However, when the shaft 24 further rotates, the rotating drum 28 rotates idly with respect to the shaft 24. That is, when the shaft 24 rotates at the start of the vertical movement of the lifting / lowering cord 20, the vertical cords 14 a before and after the ladder cord 14 relatively move up and down within a predetermined angular range of the shaft 24.

  Further, as shown in FIG. 4, the control circuit 32 disposed in the head box 12 operates in accordance with an elevation command signal from the operation unit 34. The elevation command signal from the operation unit 34 is supplied to the control circuit 32 by wire or wirelessly. A rotation angle sensor 36 for detecting the rotation angle of the rotary drum 28 is provided, and a detection angle signal from the rotation angle sensor 36 is supplied to the control circuit 32.

  In the blind configured as described above, when the operation unit 34 is operated to move the slat 16 up and down, the motor 26 is activated. By the motor drive signal from the control circuit 32, the motor 26 is controlled to rotate at a low speed at first and then at a high speed. Accordingly, when the operation starts, the vertical cords 14a and 14a before and after the ladder cord 14 relatively move at a low speed, so that the slat 16 can reliably follow the operation of the ladder cord 14 and the slat 16 can follow the ladder cord 14. It is possible to rotate without being caught on. When the slat 16 is in the fully closed state shown in FIG. 5 (a), the slat 16 goes up after passing through the states of FIGS. 5 (b), (c) and (d).

  The selection of the rotational speed of the motor 26 by the control circuit 32 and the switching of the rotational speed from the low speed to the high speed can take the following modes.

  1) The control circuit 32 measures the time from the start of rotation of the motor 26, rotates the motor 26 at a low speed, and rotates the motor 26 at a high speed when a predetermined time has elapsed.

  2) When the control circuit 32 receives the detection angle signal from the rotation angle sensor 36 and rotates the motor 26 at a low speed and detects the rotation of a predetermined angle, the motor 26 is rotated at a high speed.

  3) The control circuit 32 receives a detection angle signal from the rotation angle sensor 36 at the start of rotation, and if the detection angle is within a predetermined angle range, the motor 26 is rotated at a low speed and determined in advance. When the rotation is made for a predetermined time or a predetermined angle, the motor 26 is rotated at a high speed. At the start of rotation, if the detected angle is not within a predetermined angle range based on the detected angle signal from the rotation angle sensor 36, the motor 26 is rotated at a high speed instead of a low speed.

  4) When the control circuit 32 receives the detected angle signal from the rotation angle sensor 36 at the start of rotation and the detected angle is within a predetermined angle range, the motor 26 is rotated at a low speed to obtain the predetermined value. When the angle range is removed, the motor 26 is rotated at a high speed. At the start of rotation, if the detected angle is not within a predetermined angle range based on the detected angle signal from the rotation angle sensor 36, the motor 26 is rotated at a high speed instead of a low speed.

As the reference of the predetermined time or the predetermined angle in the above 1) and 2), or the predetermined angle range in the above 3) and 4), the slat 16 is shown in FIG. if the angle range of between up to 90 degrees to the slat 16 shown towards the heavy heart farther vertical codes of the slat 16 from the fully closed state lying above in (c) is in a horizontal position, is sufficient. Alternatively, the angle range from the fully closed state shown in FIG. 5A to the state in which the vertical cord 14a of the ladder cord 14 is completely inserted into the slit 16a of the slat 16 shown in FIG. 5B is sufficient. . In the horizontal state shown in (c), if all the slats 16 are completely placed on the middle stage 14c of the ladder cord 14 and the state in which the angles of all the slats 16 are aligned is secured, even if the slats rotate at high speed, 16 can follow the movement of the ladder code 14.

  Next, FIG. 6 is an example of the drum of the slat adjusting device according to the second embodiment. This example can be applied not only to an electric type in which a shaft is rotated by a motor but also to a manual type in which an operation cord wound around a pulley provided at one end of the shaft is manually operated.

  The slat adjusting device 42 includes a shaft 24 and a drum 48 provided on the shaft 24. The drum 48 includes a drum base 50, a sun gear 52 fitted to rotate integrally with the shaft 24, a planetary gear 54 rotating around the sun gear 52, a gear ring 56 in which the planetary gear 54 is inscribed, and the drum base 50. A drum body 58 that is pivotally supported by the gear ring 56 and engaged with the gear ring 56, a ladder ring 60 that is externally fitted to the outside of the drum body 58, and a planetary gear 54 that is pivotally supported and abuts against the ladder ring 60 outside the drum body 58. The transmission plate 59 that has become possible, the first idling drum 62 fitted to rotate integrally with the shaft 24, the second idling drum 64 pivotally supported by the first idling drum 62, and the outer periphery of the second idling drum 64 And a clutch spring 66 provided on the front side. An upper end of the lifting / lowering cord 20 is fixed to the drum main body 58, and the lifting / lowering cord 20 can be wound and unwound on the drum main body 58. Further, the upper end of the vertical cord 14 a of the ladder cord 14 is fixed to the ladder ring 60.

  A planetary gear mechanism including the sun gear 52, the planetary gear 54, the gear ring 56, and the transmission plate 59 constitutes a speed reduction mechanism. Further, the first idling drum 62 and the second idling drum 64 constitute an idling mechanism, and the outer peripheral surfaces of the first idling drum 62 and the second idling drum 64 protrude in the outer diameter direction as compared with other portions and are mutually connected. Protrusions 62a and 64a that can come into contact with each other are formed. A protrusion 58 a protruding in the axial direction is formed at the end of the drum body 58, and the protrusion 58 a is inserted into a groove 64 b formed in the second idling drum 64.

  Further, the transmission plate 59 is formed with a projection 59 a protruding in the axial direction. The projection 59 a can interfere with the ladder ring 60, and the ladder ring 60 can rotate together with the transmission plate 59. However, if the ladder ring 60 is rotated more than a certain amount by a stopper (not shown), further rotation is prevented and the spread is expanded, so that the protrusion 59 a is idled with respect to the ladder ring 60.

The operation of the slat adjustment device 42 configured as described above will be described. First, in order to raise and lower the slat 16, when the operating portion is operated and the shaft 24 rotates, the rotation is transmitted to the sun gear 52 and the first idling drum 62, and both start to rotate. Here, it is assumed that the state of the slat 16 is in the state of FIG. From here, as the shaft 24 continues to rotate, the protrusion 62a of the first idling drum 62 is not yet in contact with the projection 64a of the second idling drum 64, and the first idling drum 62 to the second idling drum. No rotation is transmitted to 64 immediately.

  On the other hand, rotation is transmitted from the sun gear 52 that rotates with the shaft 24 to the planetary gear 54. At this time, the gear ring 56 is fitted to the drum main body 58, and the rotation of the drum main body 58 is prohibited by the clutch spring 66, so the gear ring 56 cannot rotate. For this reason, the transmission plate 59 revolves by the rotation of the planetary gear 54, and the ladder ring 60 rotates together with the transmission plate 59.

  Since the transmission plate 59 transmits the rotation decelerated by the reduction mechanism to the ladder ring 60, the slat 16 rotates at a low speed.

  When the rotation of the shaft 24 continues and rotates by a predetermined angle, the protrusion 62a of the first idling drum 62 comes into contact with the protrusion 64a of the second idling drum 64, and further, the second idling drum 64 contacts the protrusion 58a of the drum body 58. In order to make contact, rotation is transmitted from the first idling drum 62 to the drum main body 58 via the second idling drum 64, and the drum main body 58 rotates. At this time, the second idling drum 64 is allowed to rotate the drum body 58 in order to relax the one-way clutch spring 66.

  When the drum body 58 rotates, the gear ring 56 also rotates together. At this time, the sun gear 52, the planetary gear 54, and the gear ring 56 are rotated together by the gear ring 56, and the rotation from the shaft 24 is transmitted to the ladder ring 60 at a speed transmission ratio of 1: 1. Rotates at high speed.

  Thus, even if the shaft 24 is operated to rotate at the same speed, the slat 16 can be changed by changing the speed transmission ratio (= the moving speed of the ladder cord 14 / the operating speed of the operating cord) while the slat 16 is rotating. The rotation speed can be switched. In the case of this example, the angle of the first idling drum 62 when the rotation of the first idling drum 62 is transmitted to the drum body 58 and the angle of the slat 16 when the rotation speed of the slat 16 should be switched are made to correspond. Thus, it is possible to switch to a low speed until the slat 16 reaches a predetermined angle (for example, until the state shown in FIG. 5B), and thereafter to a high speed.

  According to each of the embodiments described above, when the slat is moved up and down, the slat rotates following the ladder cord. Therefore, the slat can be prevented from being caught by the ladder cord and the rotation of the slat can be made uniform. In addition, by switching the rotation speed of the slats in this way, the slats are slow enough to follow the ladder code at low speeds, and as fast as possible at high speeds. In addition, the time required for operations such as raising and lowering the slats can be shortened.

  Further, if the rotation range of the slat that is set to a low speed is widened, the angle of the slat can be finely adjusted, and the amount of light collected can also be finely adjusted.

It is a front view of the blind concerning embodiment of this invention. It is a fragmentary sectional view of the blind showing the slat and ladder code concerning an embodiment of the present invention. It is a fragmentary top view of the slat of the blind showing the slat and ladder code concerning an embodiment of the present invention. It is a block diagram of the slat adjustment device of an embodiment of the present invention. It is the fragmentary sectional view and the fragmentary top view of a slat showing the operation | movement of a slat and a ladder cord. It is sectional drawing of the slat adjustment apparatus of 2nd Embodiment of this invention. It is a disassembled perspective view of the slat adjustment apparatus of 2nd Embodiment of this invention. It is a partial side view of the blind showing the conventional slat and ladder code.

Explanation of symbols

12 Head box 14 Ladder cord 16 Slat 20 Lifting cord 22, 42 Slat adjustment device

Claims (1)

The ladder cord (14) suspended from the head box (12) supports the plurality of slats (16) in an aligned state, and the vertical cords (14a, 14a) before and after the ladder cord (14) can be moved up and down relatively. And a blind provided with a slat adjustment device (22, 42) for rotating the slat (16) by relatively moving the front and rear vertical cords (14a, 14a) up and down,
The slat adjusting device (22, 42) can change the relative speed of the front and rear vertical cords, and until a predetermined time elapses from the start of rotation of the slat (16) or until a predetermined angle. At least a portion of the angular range between the angle until the slat (16) is fully closed and the angle at which the slat (16) is horizontal until the slat (16) starts rotating. When it is in a predetermined angle range that is an angle range, until a predetermined time elapses, until it rotates to a predetermined angle, or exceeds the predetermined angle range The blind is characterized in that the relative speed of the front and rear vertical cords (14a) is set to a low speed until and until then is set to a higher speed.

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