JP2010084319A - Screen lifting device of electric roll blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen lifting device of an electric roll blind enabling easy replacement of a position detection device. <P>SOLUTION: In the electric roll blind, a winding shaft 4 is rotatably supported between a pair of side brackets and a screen is lifted by rotating the winding shaft 4 with the drive force of a motor 17 stored in the winding shaft 4. The electric roll blind comprises the position detection device for detecting the lifted position of the screen. The position detection device includes a photo sensor 21 attached to a side bracket 3b and a detection pattern which is attached to the end of the winding shaft 4 so as to face the photo sensor 21 for detecting the rotation of the winding shaft by the photo sensor 21. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a screen lifting device for an electric roller blind.

  The electric roller blind is configured to move up and down the screen by rotating the winding shaft with the driving force of the motor. In such an electric roller blind, a position detection device is provided for stopping the operation of the motor and preventing further rotation of the winding shaft in the same direction when the screen is raised or lowered to the upper limit or the lower limit. ing.

The position detection device is configured to mechanically detect the upper limit position and lower limit position of the screen with a feed screw that moves based on the rotation of the winding shaft. There is a configuration in which the upper limit position and the lower limit position are electrically detected.
JP 2006-257711 A

In a mechanical position detection device using a feed screw, the detection accuracy may be reduced due to a mechanical accuracy defect such as a fitting backlash of the feed screw device.
In the position detection device using the encoder, the detection accuracy is improved as compared with the mechanical type. However, since the encoder is built in the motor unit, the sensor of the encoder may malfunction due to the vibration of the motor. In such a case, since it is necessary to replace the motor unit including the motor without any trouble in order to eliminate the malfunction of the encoder, the replacement work becomes complicated and the repair cost also increases.

  Patent Document 1 discloses a winding device that winds a curtain-like material around a winding pipe with a tubular motor with a built-in encoder. However, if the encoder malfunctions, the tubular motor needs to be replaced for each unit. .

  An object of the present invention is to provide a screen lifting device for an electric roll blind that can easily replace a position detection device.

  In claim 1, a winding shaft is rotatably supported between a pair of side brackets, the winding shaft is rotated by a driving force of a motor accommodated in the winding shaft, and the screen is moved up and down. In the electric roller blind provided with a position detecting device for detecting the raising / lowering position, the position detecting device is provided at a position facing the photo sensor at the end of the winding shaft and a photo sensor attached to the side bracket. And a detection pattern for detecting rotation of the winding shaft by the photosensor.

According to a second aspect of the present invention, a slit plate is attached to the end of the winding shaft, and a slit pattern is formed as the detection pattern on the side surface of the slit plate.
According to a third aspect of the present invention, the base end is attached to the side bracket, and the motor is attached to the motor case protruding into the winding shaft.

According to a fourth aspect of the present invention, a side case is fixed to the side bracket with a screw, and the photosensor is fixed to the side case with a screw.
According to a fifth aspect of the present invention, the end portion of the winding shaft is rotatably supported by the support shaft portion fixed to the side bracket.

  ADVANTAGE OF THE INVENTION According to this invention, the screen raising / lowering apparatus of the electric roll blind which can perform the exchange operation | work of a position detection apparatus easily can be provided.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In the electric roller blind shown in FIGS. 1 and 2, both ends of the frame 2 are supported by a mounting bracket 1 fixed to a mounting surface, and side brackets 3 a and 3 b are attached to both ends of the frame 2.

  A winding shaft 4 is rotatably supported between the side brackets 3 a and 3 b, a screen 5 is suspended from the winding shaft 4, and a weight bar 6 is attached to the lower end of the screen 5. Then, when the winding shaft 4 is rotated, the screen 5 is wound around the winding shaft 4 or rewound.

  A spring motor 7 is disposed at one end of the winding shaft 4. One end of the spring motor 7 is fixed to the side bracket 3 a so as not to rotate, and the other end is fixed to the winding shaft 4. When the take-up shaft 4 is rotated in the screen rewind direction, the spring motor 7 is stored, and when the screen 5 is taken up by the take-up shaft 4, the urging force of the spring motor 7 acts as an auxiliary force.

  A motor unit 8 that rotationally drives the take-up shaft 4 is disposed on the other end side of the take-up shaft 4, and a sensor unit (position detection) that detects the amount of rotation of the take-up shaft 4 is provided on the side bracket 3b. Device) 9 is provided. The motor unit 8 and the sensor unit 9 are connected to the controller 11 via a cable 10 so that the operation of the motor unit 8 can be controlled via the controller 11 by operating a remote control device (not shown).

  Next, specific configurations of the motor unit 8 and the sensor unit 9 will be described with reference to FIGS. As shown in FIG. 3, a cylindrical support shaft portion 13 provided at the base end portion of the motor case 12 is fixed to the side bracket 3 b with a screw 14.

  A side case 15 positioned around the support shaft portion 13 is fixed to the inner side surface of the side bracket 3 b with screws 24. At a position adjacent to the side case 15, a side cap 16 is rotatably supported on the outer peripheral surface of the support shaft portion 13, and the side cap 16 is fitted to the end of the winding shaft 4 so as not to be relatively rotatable. Has been. Therefore, the end portion of the winding shaft 4 is rotatably supported by the support shaft portion 13 via the side cap 16.

  The motor case 12 protrudes into the take-up shaft 4 and its tip is divided into two in the vertical direction so that the motor 17 can be accommodated. The output shaft of the motor 17 protrudes out of the motor case 12, and a drive bush 18 is attached to the tip. The drive bush 18 is fitted to the inner peripheral surface of the winding shaft 4, and the winding shaft 4 is rotated in the forward and reverse directions via the drive bush 18 by the operation of the motor 17. . The motor 17 is supplied with power through a power supply line included in the cable 10.

  An annular slit plate 19 is fitted to the side cap 16 at the end of the winding shaft 4. On the side surface of the slit plate 19 on the side case 15 side, as shown in FIG. 4, a slit pattern 20 is formed as a detection pattern that is partitioned at equal intervals along a line extending radially from the center of the winding shaft 4. Has been. The slit pattern 20 is configured by printing or sticking a seal, and black portions and white or light color portions are alternately arranged.

  A photo sensor 21 is attached to the side case 15 at a position facing the slit pattern 20 of the slit plate 19 with a screw 22 shown in FIG. 2, and the slit plate 19 has an opening 23 provided in the slit plate 19. The number of passages of the slit pattern 20 based on the rotation can be detected.

  As shown in FIG. 7, the photosensor 21 has a light emitting element 25 and a light receiving element 26 arranged in parallel, outputs light from the light emitting element 25, receives the reflected light by the light receiving element 26, and receives the received signal from the cable. 10 is output to the controller 11 via a signal line included in the controller 10. The controller 11 detects the number of passages of the slit pattern 20 based on the reception signal of the light receiving element 26.

  In the electric roller blind constructed as described above, when the motor 17 is operated by operating the remote control device, the winding shaft 4 is rotated and the screen 5 is moved up and down. At this time, the elevating position of the screen 5 is detected by reading the number of passages of the slit pattern 20 by the photo sensor 21.

  When the screen 5 is pulled up to the upper limit, the operation of the motor 17 in the screen winding direction is stopped. When the screen 5 is lowered to the lower limit, the operation of the motor 17 in the screen rewinding direction is stopped.

  5 and 6 show a procedure for removing the photosensor 21 when a malfunction occurs in the photosensor 21 of the sensor unit 9. First, the electric roller blind is removed from the mounting surface, the screws 14 and 24 are removed, and the side bracket 3b is removed from the motor case 12 and the side case 15 as shown in FIG.

  Next, as shown in FIG. 6, when the screw 22 is removed, the photosensor 21 can be removed from the side case 15. Then, the photo sensor 21 is removed from the cable 10 and a new photo sensor is attached to the cable 10. If the slit plate 19 is dirty, the side case 15 can be removed from the side cap 16 and the slit plate 19 can be removed from the side cap 16 for replacement or cleaning.

  Next, when the photo sensor is attached to the side case 15 and the side bracket 3b is attached to the motor case 12 and the side case 15 in the reverse order, the replacement operation of the photo sensor 21 is completed.

With the electric roll blind configured as described above, the following operational effects can be obtained.
(1) When the screen 5 is moved up and down, the amount of rotation of the winding shaft 4 can be read by the sensor unit 9, and the lifted position of the screen 5 can be detected by the controller 11. Therefore, when the winding shaft 4 is rotated to a preset rotation amount, the controller 11 can detect that the screen 5 has been raised or lowered to the upper limit or the lower limit, and can stop the operation of the motor 17.
(2) When a malfunction occurs in the photo sensor 21 of the sensor unit 9, only the photo sensor 21 can be easily replaced without removing the motor 17 from the winding shaft 4.
(3) The slit plate 19 of the sensor unit 9 can be easily replaced or cleaned without removing the motor 17 from the winding shaft 4.
(4) When a malfunction occurs in the sensor unit 9, only the sensor unit 9 can be replaced without replacing the motor 17. Therefore, the repair cost can be reduced.
(5) Since the winding shaft 4 is rotatably supported by the support shaft portion 13 fixed to the side bracket 3b via the side cap 16, the slit plate 19 attached to the end of the winding shaft 4 is used. It is difficult to transmit the vibration of the motor 17. Further, since the photo sensor 21 is fixed to the side case 15 attached to the side bracket 3b with the screw 22, the vibration of the motor 17 is hardly transmitted to the photo sensor 21. Therefore, the rotation amount of the winding shaft 4 can be stably detected by the photosensor 21.

You may implement the said embodiment in the following aspects.
-A flange part may be provided in the edge part of the winding shaft 4, and a slit pattern may be formed in the flange part. With such a configuration, the slit plate 19 can be omitted.
The slit plate may be affixed with a plurality of metal plates that reflect light along the outer periphery of the black resin disc.
-A slit plate may provide the hole which permeate | transmits light along the outer periphery of the disc which reflects light.
-You may attach a photo sensor to the side cap with the fitting member using the elasticity of a synthetic resin.

It is a partially broken front view showing an electric roll blind. It is a side view showing an electric roll blind. It is sectional drawing which shows the motor unit and sensor part of an electric roll blind. It is a side view which shows a slit plate. It is sectional drawing which shows the replacement procedure of a sensor part. It is sectional drawing which shows the replacement procedure of a sensor part. It is a front view which shows a photosensor.

Explanation of symbols

  3 ... 3a, 3b ... side brackets, 4 ... winding shaft, 5 ... screen, 15 ... side case, 16 ... side cap, 17 ... motor, 19 ... slit plate, 20 ... detection pattern (slit pattern), 21 ... photo sensor.

Claims (5)

A winding shaft is rotatably supported between a pair of side brackets, and the screen is moved up and down by rotating the winding shaft by a driving force of a motor accommodated in the winding shaft, and the lifting position of the screen is detected. In the electric roller blind equipped with the position detection device,
The position detection device includes:
A photo sensor attached to the side bracket;
An electric roll blind screen, comprising: a detection pattern provided at a position facing the photosensor at an end of the winding shaft, and detecting the rotation of the winding shaft by the photosensor. lift device.   2. The screen lifting device for an electric roll blind according to claim 1, wherein a slit plate is attached to an end of the winding shaft, and a slit pattern is formed as a detection pattern on a side surface of the slit plate.   The screen lifting device for an electric roll blind according to claim 1 or 2, wherein a base end is attached to the side bracket and the motor is attached to a motor case protruding into the winding shaft.   The screen lifting device for an electric roll blind according to any one of claims 1 to 3, wherein a side case is fixed to the side bracket with a screw, and the photosensor is fixed to the side case with a screw.   The screen lifting device for an electric roll blind according to claim 4, wherein an end portion of the winding shaft is rotatably supported by a support shaft portion fixed to the side bracket.

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