JP2020037805A - Opening/closing device - Google Patents

Abstract

To reduce problems associated with releasing blanking control.SOLUTION: A multi-optical axis sensor 40 has: a blanking control mode in which, each time a plurality of optical paths R are blocked in the order of the closing direction, the presence or absence of blocking is ignored for the optical paths R including the blocked optical paths R and positioned closer to the opening direction, and the output of a closing operation restriction signal is turned ON or OFF according to the presence or absence of blocking for the optical path R closer to the closing direction than the ignored optical path; and a normal sensing mode in which the output of the closing operation restriction signal is turned ON or OFF in response to the presence or absence of blocking for a specific normal sensing optical path of the plurality of optical paths R, the multi-optical axis sensor 40 being configured to switch to the normal sensing mode after a lapse of a predetermined period of time from the change point in the blanking control mode when there is a change in the presence or absence of blocking of the predetermined fully closed optical path R among the plurality of optical paths.SELECTED DRAWING: Figure 10

Description

  The present invention relates to an opening / closing device that closes an opening / closing body to partition a space, such as a shutter device, an overhead door, a roll blind device, a sliding door device, and a sliding gate.

Conventionally, in this type of invention, a multi-optical axis sensor in which a large number of photoelectric sensors are arranged in a vertical direction to form a large number of optical paths is mounted on left and right guide rails to cover a wide range in the vertical direction. There is a shutter device that detects an obstacle (for example, see Patent Document 1).
According to such a shutter device, during closing operation of the opening / closing body, if at least a part of many optical paths is blocked by an obstacle, the opening / closing body stops.
However, in order to prevent the opening / closing body during the closing operation from stopping by interrupting the optical path, the lower end side of the opening / closing body that performs the closing operation includes these two photoelectric sensors each time the optical path of the upper and lower two photoelectric sensors is interrupted. Disables all upper photoelectric sensors. Such control may be called blanking control. During the blanking control, the obstacle is sensed only by the photoelectric sensor located below the two photoelectric sensors.
The blanking control is released when the lower end side of the opening / closing body during the closing operation passes downward through the lowermost optical path.

JP 2010-77752 A

By the way, in a general shutter device, since a slat having a concave cross section formed by bending a metal plate is connected up and down to form an opening and closing body, the slat is continuously arranged in the width direction at the center in the thickness direction of each slat. Is formed.
Therefore, in order to perform the blanking control, a closing member 101 for blocking an optical path passing through the space is provided at the lower end side of the opening / closing body 100 (see FIG. 11). Then, when the closing member 101 sequentially blocks the optical paths of the uppermost two photoelectric sensors 201 and 201 downward, blanking control is started (at the point P1 in FIG. 11).
During the blanking control, each time the optical paths of the two photoelectric sensors 201 and 201 are sequentially blocked by the closing member 101, the photoelectric sensors 201 in the optical path R1 and immediately below the closing member 101 become ineffective. Therefore, even if the optical path is blocked by the opening / closing body 100 that closes, it is not determined that an obstacle is detected.
Then, when the closing member 101 passes downward through the optical path of the lowermost photoelectric sensor 201 (time P2 in FIG. 11), the blanking control is released, and the multi-optical axis sensor 200 enters the normal sensing state.

In the normal sensing state, the non-sensing state is maintained unless the optical paths of all the photoelectric sensors 201 pass through the space in the slat.
However, when the opening / closing body 100 swings in the thickness direction due to wind, vibration, or the like, and some of the slats block the optical path, it is regarded as obstacle detection, and the closing operation of the opening / closing body 100 stops.
For this reason, especially when the opening / closing stroke below the multi-optical axis sensor 200 becomes longer due to site conditions, the opening / closing body 100 stops before fully closing, and the space between the opening / closing body 100 and the floor surface or the like. The gap S may be formed.

In view of such a problem, the present invention has the following configuration.
An opening / closing body that closes so as to partition a space, and a multi-optical axis sensor that forms a number of optical paths arranged in the opening / closing direction in the opening / closing path of the opening / closing body, and outputs a signal output from the multi-optical axis sensor. An opening / closing device which is used as a closing operation restriction signal for restricting a closing operation of the opening / closing body, wherein the multi-optical axis sensor is configured such that each time a plurality of optical paths are blocked in the closing direction, While ignoring the presence or absence of interruption for the optical path located closer to the opening direction including the interrupted optical path, the output of the closing operation restriction signal is determined according to the presence or absence of interruption for the optical path closer to the closing direction than the ignored optical path. A blanking control mode for turning on or off, and a normal sensing mode for turning on or off the output of the closing operation restriction signal depending on whether or not a specific normal sensing optical path among the plurality of optical paths is interrupted. And the multi-optical axis sensor, during the blanking control mode, when there is a change in the presence or absence of interruption of a predetermined fully-closed optical path of the plurality of optical paths, the change time A switching device that switches to the normal sensing mode after a lapse of a predetermined time.

  Since the present invention is configured as described above, it is possible to reduce problems caused by canceling the blanking control.

It is a front view showing an example of an opening and closing device concerning the present invention. FIG. 2 is a cross-sectional view along the line (II)-(II) in FIG. 1. FIG. 3 is a cross-sectional view of a main part along line (III)-(III) in FIG. 2. 4A and 4B show a portion near a lower end on a width direction end side of the opening / closing body, where FIG. 4A is a front view and FIG. A specific example of the closing member is shown, wherein (I) is a closing member located at the top, (II) is a closing member located at the center in the vertical direction, and (III) is a closing member located at the bottom. 5 is a flowchart illustrating an example of a control operation regarding obstacle detection in the sensor control circuit, where (a) illustrates a case of a blanking control mode and (b) illustrates a case of a normal detection mode. 9 is a flowchart illustrating an example of a control operation regarding mode switching for the sensor control circuit. 9 is a flowchart illustrating another example of a control operation regarding mode switching for the sensor control circuit. 6 is a flowchart illustrating an example of a control operation of the opening / closing body control circuit according to ON / OFF of a closing operation restriction signal. 6 is a time chart showing the relationship between the opening / closing position of the opening / closing body and various signals, and schematically shows the opening / closing device on the same drawing. It is a principal part front view which shows the relationship between the closing operation | movement of an opening / closing body, and blanking control about the conventional switching device.

In the present embodiment, the following features are disclosed.
The first feature is that the multi-optical axis sensor includes an opening / closing body that closes so as to partition a space, and a multi-optical axis sensor that forms a number of optical paths arranged in the opening / closing direction in the opening / closing path of the opening / closing body. A signal output from the opening / closing member for limiting the closing operation of the opening / closing body, wherein the multi-optical axis sensor blocks a plurality of optical paths in the closing direction. Each time, the presence or absence of interruption is ignored for the light path located closer to the opening direction including the blocked optical path, and the closing is performed in accordance with the presence or absence of the interruption for the optical path closer to the closing direction than the ignored optical path. A blanking control mode in which the output of the operation restriction signal is turned on or off, and the output of the closing operation restriction signal is turned on or off depending on whether or not the specific normal sensing light path among the plurality of light paths is interrupted. Normal sensing mode, the multi-optical axis sensor, during the blanking control mode, when there is a change in the presence or absence of interruption of a predetermined fully-closed optical path of the plurality of optical paths, After a lapse of a predetermined time from the change point, the mode is switched to the normal sensing mode. (See FIGS. 6 to 10).

According to this configuration, in the blanking control mode, if there is a change in the presence / absence of interruption in the fully-closed optical path, the normal sensing mode is set after a lapse of a predetermined time from the change. That is, the blanking control mode is maintained while the predetermined time has elapsed.
For this reason, immediately after the change of the presence or absence of the fully-closed optical path is switched to the normal sensing mode, the opening / closing body is shaken in the thickness direction and is detected by the multi-optical axis sensor, and the closing operation of the opening / closing body is performed. Can be prevented from being unintentionally limited (for example, stoppage or reversal rise).

  The second feature is that, in order to effectively execute the blanking control mode, the blanking control mode is set such that the light path on the most open direction side and the light path adjacent to the light path in the closing direction are arranged in the closing direction. The program is executed on condition that it is cut off (see FIGS. 7 and 10).

  A third feature is that, in order to effectively execute the normal sensing mode, the normal sensing optical path is set closer to the closing direction than the two optical paths closest to the opening direction.

  A fourth feature is that the fully-closed optical path is constituted by an optical path closest to the closing direction and an optical path adjacent to the opening direction side of the optical path in order to effectively use all of the many optical paths.

A fifth characteristic is that the predetermined time is set to be equal to or longer than the time from when there is a change in the presence or absence of interruption of the fully-closed optical path to when the opening and closing body is substantially fully closed (see FIGS. 7 and 10). .
According to this configuration, the normal sensing mode is set before the opening / closing body is fully closed, and it is possible to effectively prevent the closing operation from being stopped by the opening / closing body sensing.

A sixth feature is that when there is a change in the presence or absence of blocking in the opening / closing body opening direction for the fully opened optical path located closer to the opening direction among the plurality of optical paths, and when the normal sensing optical path is not blocked. Turns off the closing operation restriction signal (see FIGS. 7 and 10).
According to this configuration, the closing operation of the opening / closing body can be limited until the opening / closing body is opened to some extent, and thus, the opening / closing body can be closed from a relatively low position to contact an obstacle. Can be prevented.

As a seventh feature, after the lapse of the predetermined time, the multi-optical axis sensor forcibly turns on the closing operation restriction signal regardless of whether or not any optical path is interrupted (see FIGS. 8 and 10). reference).
According to this configuration, after the lapse of the predetermined time and during the opening operation thereafter, the closing operation restriction signal can be turned ON regardless of the presence or absence of the opening / closing body detection. Therefore, for example, it is possible to prevent the closing operation from being performed at the beginning of the opening operation.

<Specific embodiment>
Next, specific embodiments having the above features will be described in detail with reference to the drawings. In the following description, “opening / closing body thickness direction” means the thickness direction of the closing / opening body. Further, the “opening / closing body width direction” refers to a direction substantially orthogonal to the opening / closing direction of the opening / closing body and not a thickness direction of the opening / closing body. The “opening / closing body opening / closing direction” means a direction in which the opening / closing body slides to partition or open a space.

  The opening / closing device 1 includes an opening / closing body 10 that closes so as to partition a space, a storage unit 20 that stores or unfolds the opening / closing body 10 in the opening direction, and both ends of the opening / closing body 10 in the width direction. It includes two guide rails 30, 30 that are surrounded in a concave cross section and guide in the opening and closing direction, a multi-optical axis sensor 40 that detects an obstacle below the opening and closing body 10 in a non-contact manner, and a control circuit 50. And a shutter device mounted on a frame having a relatively wide opening such as a garage or a factory.

  The opening / closing body 10 constitutes the opening / closing body main body 11 by connecting a plurality of slats 11a formed by bending a horizontally long substantially rectangular metal plate so as to rotate between vertically adjacent slats 11a, 11a, A fixed seat plate 12 is connected to a lower end portion of the opening / closing body 11, and a movable seat plate 13 is connected to a lower end side of the fixed seat plate 12 so as to be relatively vertically movable.

At the end of the opening / closing body 10 in the width direction, a removal prevention member 14 that prevents removal from the guide rail 30 is provided (see FIGS. 2 and 4).
The detachment prevention member 14 protrudes in the lateral width direction from the end of the opening / closing body 10, and integrally has a portion extending in the opening / closing body width direction on the protruding end side.

The lowermost slats 11a, the movable seat plate 13, and the fixed seat plate 12 are provided with closing members 15, 16, and 17, respectively (see FIGS. 4 and 5).
These closing members 15, 16, 17 are respectively attached to the ends of the slats 11a, the movable seat plate 13, and the fixed seat plate 12 so as to block a space communicating in the width direction inside the lower end of the opening / closing body. ing.

  As shown in FIG. 5 (I), the uppermost closing member 15 has a fastening piece 15a fastened to the back surface of the slat 11a, and a width of the slat 11a which is bent with respect to the fastening piece 15a. It is an integral member having a closing piece 15b for closing the opening at the end in the direction. The closing member 15 is fixedly fastened to the slat 11a immediately above the fixed seat plate 12.

  The closing member 16 on the center side is formed in a substantially block shape having a closing piece 16a for closing the opening at the end in the width direction of the fixed seat plate 12, and a fastening portion 16b fastened to the fixed seat plate 12. In the illustrated example, it is configured by combining a plurality of members.

  The lowermost blocking member 17 is fixed to the movable seat plate 13 and a closing piece portion 17 a inserted into the movable seat plate 13 to block an optical path R that is going to pass through the movable seat plate 13. This is a member integrally having the fastening piece 17b.

These closing members 15, 16, 17 are used in a blanking control mode in which two upper and lower optical paths R are sequentially blocked two by two during a normal closing operation of the opening / closing body 10.
Therefore, if these closing members 15, 16, 17 function similarly, it is possible to adopt a mode other than the illustrated example, such as singular, two, four or more.

In a preferred example of the present embodiment, the center of the plurality of optical paths R and the center of the opening and closing body 10 coincide or substantially coincide with each other in the thickness direction of the opening and closing body.
According to this configuration, the end in the width direction of the opening / closing body 10 is brought close to the light emitting surface 40a1 (or light receiving surface) of the multi-optical axis sensor 40, and the light emitting surface 40a1 (or light receiving surface) becomes dirty or foreign matter. Can be prevented from adhering.

  As shown in FIG. 1, the storage unit 20 includes a winding shaft 22 that winds and unwinds the opening / closing body 10 in a storage case 21 having an opening formed in the lower part for allowing the opening / closing body 10 to protrude and retract. An opening / closing device 23 for drivingly rotating and braking the winding shaft 22 via a power transmission mechanism such as a chain and a sprocket, and an opening / closing body control circuit 51 which is a part of the control circuit 50.

  The storage case 21 is formed in a hollow rectangular parallelepiped shape by a side cover 21a at both ends, a case body 21b connected to the side cover 21a and extending in the width direction of the opening and closing body, and the like.

The switch 23 is configured by a rotary electric motor, a braking mechanism, and the like.
The switchgear 23 is provided with a fully-closed and fully-opened sensor 23a that outputs a contact signal at the fully-closed position and the fully-opened position of the switch body 10. The fully-closed and fully-opened sensor 23a is a switch having a mechanical counter structure that outputs a contact signal when the rotation amount of the rotating portion of the switch 23 reaches a predetermined value.

The opening / closing body control circuit 51 is, for example, an electronic circuit provided with a microcomputer and the like, and functions according to a program stored in advance, as described later, a closing operation restriction signal from the multi-optical axis sensor 40 and an opening switch (not shown). , And processes the signals of the stop switch and the close switch, other signals, and the like, and controls the switchgear 23 according to the processing result.
The opening / closing body control circuit 51 and the opening / closing device 23 are disposed in the storage case 21 at one side in the opening / closing body width direction (to the left in the illustrated example).

Further, the guide rail 30 is configured to surround the widthwise end of the opening / closing body 10 in a concave shape on the opposite side to one side in the opening / closing body width direction.
As shown in FIG. 2, the guide rail 30 includes a hollow fixed support 31 fixed to an immovable portion on the skeleton side in the opening and closing direction of the opening and closing body, and a guide detachably connected to the fixed support 31. A multi-optical axis sensor is provided by a bracket 48 in the fixed support 31 on the back side of the guide rail main body 32, comprising a rail main body 32 and an inner guide rail 33 which engages the release prevention member 14 in the guide rail main body 32 so as not to be able to escape. 40 is fixed.

  A light passage hole 33b1 is provided in the inner guide rail 33 and the fixed support 31 so as to penetrate from the bottom of the inner guide rail 33 into the fixed support 31 at a position facing the end of the stopper member 14.

  The light passage hole 33b1 is a through hole for passing through the optical path R of the multi-optical axis sensor 40, and faces the light projecting surface 40a1 (or light receiving surface) of each of the photoelectric sensors 42 constituting the multi-optical axis sensor 40. .

The multi-optical axis sensor 40 includes a first unit 40a extending vertically in one guide rail 30 and a second unit 40b extending vertically in the opposite guide rail 30. A plurality of optical paths R are arranged in the opening and closing path of the opening and closing body 10 at intervals in the opening and closing direction.
The signal output from the multi-optical axis sensor 40 is used as a closing operation restriction signal for restricting the closing operation of the opening / closing body 10.

The first unit 40a and the second unit 40b are respectively separated from the contact target portion G (for example, a lower frame, a floor surface, the ground, or the like) of the opening / closing body 10 when fully closed by a predetermined distance H toward the opening direction. And is fixed to the inner guide rail 33 and the back side of the guide rail main body 32 (inside the fixed support 31).
The predetermined dimension H is set within a range of 150 to 1500 mm, and more preferably, is set within a range of 150 to 500 mm.
These two units 40a and 40b form a large number of optical paths R with a substantially constant vertical interval (see FIG. 1).

  The first unit 40a has a large number of light emitters (not shown) at substantially constant intervals in the longitudinal direction in a cubic case elongated in the opening and closing direction of the opening and closing body. These floodlights emit light (for example, infrared rays) as an obstacle sensing medium upon receiving power supply from the electric wiring 49 in the fixed support 31.

The second unit 40b includes, in a cubic case elongated in the opening / closing body opening / closing direction, a plurality of light receivers (not shown) spaced at substantially constant intervals in the longitudinal direction, and sensing signals of these light receivers. And a sensor control circuit 41 for processing.
Each light receiver of the second unit 40b and each light emitter of the first unit 40a facing each other constitute a photoelectric sensor 42 that senses an object by an optical path R formed therebetween.

  The sensor control circuit 41 processes the sensing signal from the light receiver, and as a result of the processing, switches between a blanking control mode and a normal sensing mode, which will be described later, and executes the mode. Or turn it off.

Here, the closing operation restriction signal is a signal for restricting the closing operation of the opening / closing body 10, and may be, for example, a contact signal that changes between an OFF state and an ON state, or a voltage signal. .
As will be described in detail later, for example, the closing operation restriction signal is turned on when the multi-optical axis sensor 40 detects a foreign object, an obstacle, or an object such as the opening / closing body 10, and is turned off when the multi-optical axis sensor is in a non-sensing state.
When the closing operation restriction signal is ON, the opening / closing body control circuit 51 does not close the opening / closing body 10 even if there is a closing command by a closing switch or the like. In addition, the opening / closing body control circuit 51 stops the closing operation of the opening / closing body 10 when the closing operation restriction signal is turned on during the closing operation of the opening / closing body 10.

The electric wiring 49 on the first unit 40a side and the electric wiring 49 on the second unit 40b side are respectively guided upward through a space in the guide rail 30, and are controlled by the open / close body control circuit in the storage case 21. 51 is electrically connected.
In particular, in a preferred example of the present embodiment, the second unit 40b having the photodetector and the electric wiring 49 thereof are arranged on the opposite side by being displaced toward the opening / closing body control circuit 51 in the opening / closing body width direction. Compared to the case, the electric resistance and noise are reduced.

The relationship between the many optical paths R and the guide rails 30 will be described in detail. As shown in FIG. 3, a plurality of light passage holes 33b1 on the bottom side of the guide rails 30 are provided at intervals in the vertical direction.
Each of the light passage holes 33b1 is formed in a vertically elongated shape so as to pass a plurality (four in the illustrated example) of the plurality of light paths R which are a part of the many light paths R.
According to the elongated light passage hole 33b1, clogging of foreign matter such as dust can be reduced as compared with the case where the light passage hole is a circular hole.
Further, since a plurality of optical paths R correspond to one elongated light passing hole 33b1, alignment of the optical axis in the vertical direction is easy and the productivity is excellent.

The light passage hole 33b1 on the first unit 40a side has a width W slightly larger than the diameter of the light projecting surface 40a1 of the light projector of the multi-optical axis sensor 40.
That is, the light projector emits light in a radial shape that spreads at a predetermined angle. The width W of the light passage hole 33b1 is set so as to appropriately maintain the radial spread.
Further, a light passage hole (not shown) on the second unit 40b side is also formed in substantially the same manner as the light passage hole 33b1.
Therefore, the light receiver facing the light emitter receives light emitted from the light emitter even when its position is slightly shifted in the thickness direction of the opening / closing body (the width W direction in the drawing) due to a manufacturing error or the like. Will be.

The width W of the light passage hole 33b1 is set smaller than the thickness X (see FIG. 2) of the end face in the width direction of the opening / closing body 10. In addition, according to an example of the present embodiment, the dimension X is a dimension in the thickness direction of the closing members 15, 16, and 17.
According to this configuration, at the time of blanking control, the two optical paths R can be satisfactorily blocked by the width direction end of the opening / closing body 10.
Moreover, since the hole width is relatively small, it is possible to effectively prevent foreign matter such as dust from adhering to the light passage hole 33b1.
Further, it prevents the inner edge of the light passage hole 33b1 from interfering with the end portion of the opening / closing body 10, and slides or catches on the opening / closing body 10, thereby damaging the light emitting surface 40a1 (light receiving surface). Can be prevented.

According to an example of the present embodiment, the control circuit 50 includes the opening / closing body control circuit 51 and the sensor control circuit 41 described above, and controls the operation of the opening / closing device 1 in cooperation with the two control circuits 51.
As another example, the control circuit 50 can be configured by a single control circuit or three or more control circuits.
When there are a plurality of control circuits 50, the respective functions such as a blanking mode, a normal sensing mode, and a reset operation (command transmission and control) to be described later can be arbitrarily set.
When the control circuit 50 is singular, the singular control circuit (for example, the opening / closing body control circuit 51) performs all of the later-described blanking mode, normal sensing mode, reset operation, and the like.

Next, the basic operation of the sensor control circuit 41 and the opening / closing body control circuit 51 will be described.
The sensor control circuit 41 executes one of the blanking control mode and the normal sensing mode according to a predetermined condition.

<About blanking control mode>
The blanking control mode is a mode that is executed when the opening / closing body 10 during the closing operation passes through the optical path R of the multi-optical axis sensor 40.
In this blanking control mode, when a plurality of light paths are blocked in the closing direction, the sensor control circuit 41 ignores the presence or absence of blocking of the light paths located closer to the opening direction including the blocked light paths. At the same time, the output of the closing operation restriction signal is turned ON or OFF depending on whether or not the light path below the ignored light path is interrupted.
Here, according to the example shown in FIG. 1, the configuration “the optical path located near the opening direction including the blocked optical path” is adjacent to the lower side of the two optical paths that are blocked in the order of the closing direction. All the optical paths are equal to or longer than the optical path R1. In other words, this configuration refers to the optical path of the photoelectric sensor 42 (the three uppermost ones in FIG. 1) facing the ends in the width direction of the opening and closing body 10 and the optical path R1 adjacent to the lower side of the optical path. is there.

  In addition, as another example other than the illustrated example, the “optical path located near the opening direction including the blocked optical path” is defined as all the optical paths located above the optical path R1 without including the optical path R1. (That is, only the optical paths of all the photoelectric sensors 42 facing the end surface of the opening / closing body 10).

  The obstacle sensing operation in the blanking control mode will be described. As shown in FIG. 6A, the sensor control circuit 41 includes at least one of the plurality of optical paths R below the optical path R1 immediately below the opening / closing body 10. It is determined whether or not one of them is interrupted (step S1). If it is interrupted, the output of the closing operation restriction signal is turned on (step S2), and if not, the output of the closing operation restriction signal is turned off (step S2). Step S3). Thereafter, the process returns to step S1.

<About normal sensing mode>
The normal sensing mode is a mode executed when a reset operation is performed under predetermined conditions described later.
In the normal sensing mode, the sensor control circuit 41 turns on or off the output of the closing operation restriction signal depending on whether at least a part of the normal sensing optical path R is interrupted regardless of the order of the closing direction.

Here, the “normal sensing optical path R” is closer to the closing direction than the upper and lower two optical paths R, R closest to the opening direction, and is more open than the upper and lower two optical paths R, R closest to the closing direction. The plurality of optical paths R located on the direction side, for example, as shown in FIG. 10, formed by a plurality of photoelectric sensors 42 for normal sensing on the center side in the vertical direction.
The “upper and lower optical paths closest to the opening direction” are two optical paths R, R located above the normal sensing optical path R. These optical paths R, R may be referred to as fully opened optical paths in this specification.
The “upper and lower optical paths R closest to the closing direction and the opening direction” are two optical paths R, R located below the normal sensing optical path R. These light paths R, R may be referred to as fully-closed light paths in this specification.

Next, the obstacle sensing operation in the normal sensing mode will be described in detail with reference to the flowchart of FIG.
In the normal sensing mode, the sensor control circuit 41 determines whether there is a change in the presence / absence of blocking in the opening / closing body opening direction of the fully opened optical paths R, R located closest to the opening direction among the many optical paths R, and a plurality of normal paths. On condition that all the sensing optical paths R are not interrupted (step S20), the closing operation restriction signal is turned off (step S23), and if not, the process proceeds to step S21.
Here, the “change in presence or absence of blocking in the opening / closing body opening direction” specifically means that the two fully-opening optical paths R, R, which are vertically arranged on the uppermost side, sequentially close the closing members 15, 16. , 17 are released.

In step S21, the output of the closing operation restriction signal is turned ON or OFF depending on whether or not the plurality of normal sensing optical paths R are blocked.
More specifically, the sensor control circuit 41 determines whether or not at least a part of the plurality of normal sensing optical paths R has been interrupted, and if interrupted, proceeds to step S22 to close. The output of the operation restriction signal is turned ON, otherwise, the process proceeds to step S23, and the output of the closing operation restriction signal is turned OFF.
Then, after step S22 or S23, the process returns to step S20.

<About mode switching operation>
Next, the switching operation between the blanking control mode and the normal sensing mode will be described in detail with reference to the flowchart of FIG.

  The sensor control circuit 41 performs a reset operation when the power is turned on by energizing the switchgear 1 or the like (step S31). In this reset operation, an initial state of the normal sensing mode is set.

  In the next step S32, the light path R on the most open direction side and the light path R adjacent to the light path R in the closing direction side among the many light paths R (in other words, the two fully opened light paths R and R) are closed. It waits for the cutoff in the order of the directions, and if cut off, the process proceeds to the next step S33.

  In step 33, the mode of the sensor control circuit 41 is switched to the blanking control mode, and the process proceeds to the next step S34.

In step S34, while the blanking control mode is maintained, the process waits until there is a change in whether or not the fully-closed optical paths R, R are interrupted, and proceeds to the next step S35.
Here, according to the illustrated example, the “change in presence / absence of blocking” is a change in which the two fully-closed optical paths R, R are sequentially released downward from the blocking state by the blocking members 15, 16, 17 in the downward direction. It is. In addition, as another example of this change, a change that is cut off from the released state can also be used.

In step 35, the process waits for a predetermined time to elapse, and after that, the process proceeds to the next step S36.
Here, the predetermined time is set to be equal to or longer than the time from when the lower fully-closed optical path R changes from the blocked state to the released state until the opening / closing body 10 is substantially fully closed (including completely closed). According to a preferred example of the present embodiment, it is set to about 5 seconds.

  In step S36, by performing the reset operation, the mode is switched to the normal sensing mode, and the process returns to step S32.

<Operation of switch control circuit>
The opening / closing body control circuit 51 controls the opening / closing device 23 according to the closing operation restriction signal input from the multi-optical axis sensor 40, and limits the closing operation of the opening / closing body 10.
Explaining in detail according to the flowchart shown in FIG. 9, the opening / closing body control circuit 51 determines whether the closing operation restriction signal is ON (step S51), and if it is ON, the process proceeds to the next step S52. If it is OFF, the process proceeds to step S53.

In step S52, the opening / closing body 10 is set to the closed state and the open state.
More specifically, when the opening / closing body 10 is performing the closing operation, the opening / closing body control circuit 51 stops the closing operation of the opening / closing body 10 by stopping the switch 23 or the like. Further, when there is a closing signal due to operation of a not-shown closing switch or the like, the opening / closing body control circuit 51 ignores the closing signal and does not perform the closing operation of the opening / closing body 10.
On the other hand, in this step S52, when the opening / closing body 10 is in the opening operation, the opening operation is continued. For example, when the opening / closing body 10 is stopped and there is an opening signal by operating an opening switch (not shown) or the like. , The opening / closing body 10 is opened according to the signal.

Further, in step S53, the opening / closing body 10 is allowed to close and open.
More specifically, when the opening / closing body 10 is performing the closing operation, the opening / closing body control circuit 51 continues the closing operation. Further, when the opening / closing body control circuit 51 is stopped and there is a closing signal by operating a closing switch (not shown) or the like, the opening / closing body 10 closes the opening / closing body 10 according to the closing signal.
On the other hand, in step S53, if there is an opening signal due to operation of an opening switch (not shown) or the like, the opening / closing body 10 is opened according to the signal.

  Note that the stop of the opening / closing body 10 by the operation of the stop switch (not shown) is enabled at any point in the above-described steps.

<Example of control during actual operation>
Next, a control example during the actual operation of the opening and closing body 10 will be described in detail.
FIG. 10 is a time chart schematically showing the relationship between the opening / closing operation of the opening / closing body 10 and various signals.

  First, when the power is supplied to the switching device 1 and the power of the sensor control circuit 41 is turned on in a state where the opening and closing body 10 is stopped at the fully open position, the sensor control circuit 41 performs a reset operation to perform the normal sensing mode. (See P0 in FIG. 10 and step S31 in FIG. 7).

  Next, when the closing switch is operated, the opening / closing body control circuit 51 starts the closing operation of the opening / closing body 10 (see the point P1 in FIG. 10).

  During the closing operation of the opening / closing body 10, when the closing members 15, 16, and 17 fully open and block the optical paths R and R in order, the sensor control circuit 41 switches the normal sensing mode to the blanking control mode (at time P2 in FIG. 10). , And steps S32 to S33 in FIG. 7).

In the blanking control mode, for example, when a foreign substance or the like enters the closing direction side of the opening / closing body 10, the sensor control circuit 41 detects the foreign substance or the like and turns on the output of the closing operation restriction signal (P3 in FIG. 10). Time point and steps S1 and S2 in FIG. 6).
For this reason, the opening / closing body control circuit 51 makes the closing operation impossible and the opening operation possible for the opening / closing body 10 (see steps S51 to S52 in FIG. 9).

  Thereafter, when the foreign matter or the like is removed, the sensor control circuit 41 turns off the output of the closing operation restriction signal. In this OFF state, for example, when a closing switch (not shown) is operated, the opening / closing body control circuit 51 restarts the closing operation of the opening / closing body 10 (see a point P4 in FIG. 10).

Then, when the closing members 15, 16, 17 of the opening / closing body 10 during the closing operation pass through the lowermost fully-closed optical paths R, R, the presence / absence of interruption of the optical path changes (P5 in FIG. 10). Time point).
Thereafter, the sensor control circuit 41 waits for a predetermined time (for example, 5 seconds) to elapse from the time of the change. For this reason, the opening / closing body 10 is substantially fully closed during the elapse of the predetermined time (see the point P6 in FIG. 10).

  Next, after the elapse of the predetermined time, the sensor control circuit 41 performs a reset operation to switch the blanking control mode to the normal sensing mode (at time P7 in FIG. 10, see steps S35 to S36 in FIG. 7).

After the mode switching, a part of the opening / closing body 10 above the closing members 15, 16, 17 (specifically, any of the plurality of slats 11 a) is connected to one of the plurality of normal sensing optical paths R. When this is interrupted, the multi-optical axis sensor 40 turns on the output of the closing operation restriction signal.
That is, after switching to the normal sensing mode, normally, any one of the slats 11a blocks at least a part of the plurality of normal sensing optical paths R, so that the output of the closing operation restriction signal is turned ON. .

As another example, as shown as step S37 in the flowchart of FIG. 8, after the lapse of the predetermined time, the photoelectric sensor 42 forcibly outputs the closing operation restriction signal regardless of whether or not any optical path is interrupted. It is also possible to adopt a mode in which the switch is turned ON.
The flowchart shown in FIG. 8 is different from the flowchart shown in FIG. 7 in that step S37 is added after step S36.

  Next, when the opening switch (not shown) is operated while the opening / closing body 10 is fully closed, the opening / closing body control circuit 51 starts the opening operation of the opening / closing body 10 (refer to P8 in FIG. 10).

  During the opening operation, before the closing members 15, 16, 17 pass the uppermost fully-opening optical paths R, R, the output of the closing operation restriction signal is ON. Thus, even if there is a closing signal from the closing switch, the closing signal is ignored and the opening operation of the opening / closing body 10 is continued.

  During the opening operation, the closing members 15, 16, 17 pass the fully opened optical paths R, R, and if a plurality of normal sensing optical paths R are in the released state (non-blocking state), the closing operation is restricted. The signal output is turned off (see P9 in FIG. 10 and steps S20 and S23 in FIG. 6B).

  Further, when the opening / closing body 10 during the opening operation is fully opened, the opening / closing body control circuit 51 stops the switchgear 23 according to a signal of the fully closed and fully opened detecting unit 23a or a signal of a load detecting unit (not shown) ( The opening / closing body 10 is maintained at the fully open position (see time point P10 in FIG. 10).

Next, when there is a signal of the closing switch, the opening / closing body control circuit 51 starts the closing operation of the opening / closing body 10 by driving the opening / closing device 23 (see P11 in FIG. 10). During this closing operation, for example, when a foreign object is detected by the multi-optical axis sensor 40, the closing operation restriction signal is turned ON, so that the opening / closing body control circuit 51 stops the closing operation of the opening / closing body 10 (P12 in FIG. 10). Time point, and steps S21 to S22 in FIG. 6).
When the foreign matter is removed during the stop, the closing operation restriction signal is turned off (see S21 and S23 in FIG. 6B). Thereafter, when there is a signal of the closing switch, the opening / closing body control circuit 51 restarts the closing operation of the opening / closing body 10 (at a point P13 in FIG. 10).
During this closing operation, when the blocking members 15, 16, 17 sequentially block the fully opened optical paths R, R, the mode is switched from the normal sensing mode to the blanking control mode again (at the point P14 in FIG. 10; steps S32 to S32 in FIG. 7). See S33).

Therefore, according to the opening / closing device 1 having the above configuration, the resetting operation (switching to the normal sensing mode) is not performed immediately after the closing members 15, 16, and 17 pass through the optical paths R and R fully closed. Since the reset operation is performed after a lapse of a predetermined time from the passage, the reset operation can be extended until the opening / closing body 10 is substantially fully closed (see P5 to P7 in FIG. 10).
For this reason, immediately after the passage, the slat 11a swings in the thickness direction to cut off the optical path, so that the output of the closing operation restriction signal is turned ON, and the slat 11a stops before the opening / closing body 10 is fully closed. This can be prevented.

  Further, when the opening / closing stroke changes depending on site conditions, the setting of the predetermined time may be changed by providing a dip switch for changing the setting, for example, so that the closing members 15, 16, 17 may be changed. There is no need to change the vertical length.

Furthermore, according to the opening / closing device 1, until the opening / closing body 10 during the opening operation is fully opened and passes upward through the optical paths R, R, the presence of foreign matter on the photoelectric sensor 42 and the presence or absence of an obstacle in the optical path are determined. Regardless, since the output of the closing operation restriction signal is kept ON, the closing operation of the opening / closing body 10 can be restricted.
Therefore, it is possible to prevent the opening / closing body 10 that has opened from the fully closed position from closing from a relatively low position, thereby reducing the possibility that the opening / closing body 10 comes into contact with an obstacle.

<About the modification>
According to the above embodiment, the fully-closed optical path is the lower and upper two optical paths, but another example of the fully-closed optical path is a single optical path located at the lowermost side. It is also possible to adopt an embodiment or an embodiment in which three or more optical paths are arranged vertically at the lowermost side.

  Further, according to the above embodiment, the fully opened optical path is the upper and lower two optical paths, but other examples of the fully opened optical path include a single optical path located at the uppermost position, It is also possible to have three or more optical paths arranged vertically on the upper side.

  Further, according to the above-described embodiment, the normal sensing optical path is a plurality of optical paths between the fully opened optical path and the fully closed optical path, but as another example, the normal sensing optical path is more than the fully opened optical path. It is also possible to use all the lower optical paths.

According to the above-described embodiment, as a particularly preferable example, the light passage hole 33b1 is an elongated hole that passes a part of the optical path R (see FIG. 3), but another example of the light passage hole 33b1. It is also possible to form the optical path R so as to be long in the vertical direction so as to include all the optical paths R.
Further, as another example of the light passage hole 33b1, a notch shape or a slit shape can be formed. For example, the guide rail 30 is composed of two members divided in the thickness direction of the opening and closing body, and a notch is provided in one of the members and the other member, and the two notches are combined to form the light passage hole 33b1. May be configured.

  Further, according to the above embodiment, the light projecting surface 40a1 (or the light receiving surface) is configured to be exposed to the outside air on the opening / closing body 10 side in the opening / closing body width direction. However, as another example, each light passing hole 33b1 is provided. May be covered with a translucent member (for example, a plate) or a transparent member. According to this configuration, it is possible to prevent the light projecting surface 40a1 (or the light receiving surface) from being stained or damaged due to contact with an object or the like.

  Further, according to the above-described embodiment, the light passage hole 33b1 is provided so as to penetrate the inner guide rail 33 and the bottom wall of the guide rail main body 32. In a configuration in which the guide rail 33 is omitted, a mode in which a light passage hole is provided only in the bottom wall of the guide rail body 32, a mode in which a separate plate having a light passage hole is provided on the bottom side of the guide rail body 32, and the like. It is also possible.

Further, the relationship between the light emitter and the light receiver of the first unit 40a and the second unit 40b constituting the multi-optical axis sensor 40 may be reversed. That is, it is also possible to provide a large number of light receivers in the first unit 40a and a large number of light emitters respectively facing the second unit 40b.
As still another example, one unit may be provided with a light emitter and a light receiver, and the other unit may be provided with a reflector so that light emitted from the light emitter is reflected and captured by the light receiver.

  Further, according to the above-described embodiment, the multi-optical axis sensor 40 is partially provided on the lower side of each guide rail 30. However, as another example, the multi-optical axis sensor 40 is opened and closed by the opening and closing body 10. It is also possible to provide over substantially the entire height of the opening.

Further, in the above-described embodiment, the reset operation when the power is turned on, and when the blocking members 15, 16, 17 pass through the lowermost fully-closed optical path R downward and the presence / absence of interruption of the optical path R changes. The reset operation executed after the elapse of the predetermined time is performed by the sensor control circuit 41. However, as another example, the following operation may be performed.
That is, as another example, in the reset operation when the power is turned on, the opening / closing body control circuit 51 issues a reset command to the sensor control circuit 41, and the sensor control circuit 41 performs the reset operation based on this command. Good.

  Further, as another example, the sensor control circuit 41 controls the opening / closing member to output a signal indicating that the presence / absence of the optical path R has changed due to the closing members 15, 16, 17 passing through the lowermost fully-closed optical path R downward. Output to the circuit 51, based on this signal, the opening / closing body control circuit 51 outputs a reset command to the sensor control circuit 41 after a lapse of a predetermined time, and the sensor control circuit 41 performs a reset operation based on this command. You may.

  Further, the present invention is not limited to the above-described embodiment, and can be appropriately changed without changing the gist of the present invention.

10: Opening / closing body 11a: Slats 15, 16, 17: Closing member 20: Storage section 23: Switch 30: Guide rail 40: Multi-optical axis sensor 40a: First unit 40b: Second unit 41: Sensor control circuit 42: Photoelectric sensor 50: Control circuit 51: Open / close body control circuit R, R1: Optical path

Claims (7)

An opening / closing body that closes so as to partition a space, and a multi-optical axis sensor that forms a number of optical paths arranged in the opening / closing direction in the opening / closing path of the opening / closing body, and outputs a signal output from the multi-optical axis sensor. An opening / closing device that is used as a closing operation restriction signal for restricting a closing operation of the opening / closing body,
The multi-optical axis sensor ignores the presence / absence of interruption for the optical paths located closer to the opening direction, including these interrupted optical paths, each time a plurality of optical paths are interrupted in the closing direction, and this is ignored. A blanking control mode for turning on or off the output of the closing operation restriction signal in accordance with the presence / absence of blocking for an optical path closer to the closing direction than the optical path, and a blanking control mode for blocking a specific normal sensing optical path among the multiple optical paths. A normal sensing mode for turning on or off the output of the closing operation restriction signal depending on the presence or absence,
The multi-optical axis sensor, during the blanking control mode, when there is a change in the presence or absence of interruption of a predetermined fully-closed optical path of the plurality of optical paths, after a lapse of a predetermined time from the change time A switching device for switching to the normal sensing mode.   2. The blanking control mode is executed on condition that an optical path closest to the opening direction and an optical path adjacent to the closing direction side of the optical path are blocked in the order of closing direction. The switchgear as described.   The switchgear according to claim 2, wherein the optical path for normal sensing is set closer to the closing direction than the two optical paths closest to the opening direction.   The switching device according to any one of claims 1 to 3, wherein the fully-closed optical path includes an optical path closest to the closing direction and an optical path adjacent to the opening side of the optical path.   5. The method according to claim 1, wherein the predetermined time is set to be equal to or longer than a time from when there is a change in the presence or absence of blocking of the fully-closed optical path to when the opening and closing body is substantially fully closed. The switchgear according to claim 1.   When there is a change in the presence / absence of blocking in the opening / closing body opening direction for the fully opened light path located closest to the opening direction among the plurality of light paths, and when the normal sensing light path is not blocked, the closing operation restriction is performed. The switchgear according to any one of claims 1 to 5, wherein the signal is turned off.   The multi-optical axis sensor forcibly turns on the closing operation restriction signal after the lapse of the predetermined time irrespective of whether or not any optical path is interrupted. The switchgear according to claim 1.

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