Opening and closing device

Abstract

To reduce sensor failures due to flooding.SOLUTION: An opening and closing device has an opening and closing body 10 that closes downward so as to separate a space, and an optical multi-axis sensor that forms multiple optical paths R in order to detect an object by a pair of light emitting portion 40a1 and light receiving portion 40b1 that are vertically disposed in large numbers. A water stop of a predetermined height is disposed on a lower side of the opening and closing body 10 with one side of a space that is separated in a fully-closed state regarded as a flooding expected area to prevent water accumulated in the flooding expected area from flowing into the other side of the space. In the optical multi-axis sensor, the pair of light emitting portion 40a1 and light receiving portion 40b1 are disposed spaced away from the water stop 12 in the other side of the space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an opening and closing device, such as a shutter device or an overhead door, which performs a closing operation on an opening and closing body so as to partition a space. [Background technology]

[0002] Conventional inventions of this type include, for example, a garage shutter device, as described in Patent Document 1, which has a water stop plate at the bottom end of an opening and closing body that separates the space and operates to close, and this water stop plate prevents water from entering the garage from the outside when the garage is fully closed. In such a shutter device, when the opening / closing body is opened, objects of different heights, such as people and cars, pass through the opening, so it is necessary to detect objects in a range extending from above to below the opening.

[0003] A shutter device that can sense objects of different heights as described above is described, for example, in Patent Document 2. This shutter device is equipped with a multi-optical axis sensor that extends in the vertical direction within left and right guide rails. This multi-optical axis sensor forms a number of optical paths that are aligned in the vertical direction using a number of light-emitting units and light-receiving units that are aligned in the vertical direction, and emits a detection signal when any of these optical paths is blocked by an object. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-204843 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-77752 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the multi-optical axis sensor is installed in the former shutter device, water that has risen in level outside the garage may flow into the gap between the guide rail and the opening / closing body and adhere to the multi-optical axis sensor, which may cause a short circuit or poor insulation. [Means for solving the problem]

[0006] In view of the above problems, the present invention has the following configuration. an opening and closing device that includes an opening and closing body that closes downwards to separate a space, and a multi-optical axis sensor that forms multiple optical paths for detecting objects using multiple pairs of light-emitting and light-receiving elements lined up in the vertical direction; a water stop plate of a predetermined height is provided on the lower side of the opening and closing body, and the space on one side that is separated when the opening and closing body is fully closed is regarded as an area expected to be flooded, and water that accumulates in the area expected to be flooded is prevented from flowing into the space on the other side; and the multi-optical axis sensor is characterized in that the pair of light-emitting and light-receiving elements are arranged in the space on the other side, away from the water stop plate. [Effects of the Invention]

[0007] Since the present invention is configured as described above, it is possible to reduce sensor failure due to water intrusion. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front view showing an example of an opening and closing device according to the present invention. [Figure 2] 4A and 4B are longitudinal cross-sectional views of the main part of the opening and closing device, in which FIG. 4A shows the state before being fully closed, and FIG. 4B shows the fully closed state. [Figure 3] FIG. [Figure 4] FIG. 2 is a perspective view illustrating an example of a light blocking member. [Figure 5] 5 is a flowchart showing an example of an obstacle sensing operation of the sensor control circuit, where (a) shows the case of a blanking control mode, and (b) shows the case of a normal sensing mode. [Figure 6]1 is a structural diagram showing an object detection sensor housed in a housing case, with essential parts cut away; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] This embodiment discloses the following features. The first feature is that the opening and closing device is equipped with an opening and closing body that performs a downward closing operation to separate a space, and a multi-optical axis sensor that forms multiple optical paths for detecting objects using multiple pairs of light-emitting and light-receiving units that are arranged in the vertical direction, and a water stop plate of a predetermined height is provided on the lower side of the opening and closing body so that the space on one side that is separated when the opening and closing body is fully closed is regarded as an area expected to be flooded, and water that accumulates in the area expected to be flooded does not flow into the space on the other side, The multi-optical axis sensor has the pair of light-emitting and light-receiving parts disposed in the space on the other side, spaced apart from the waterstop (see FIGS. 1 to 3). With this configuration, even if the expected flooding area is flooded, the multi-optical axis sensor can be prevented from being flooded.

[0010] As a second feature, in order to reduce false detection due to bending of the opening / closing body, the multi-optical axis sensor has a blanking control mode in which, each time two or more partial optical paths among the multiple optical paths are blocked in the closing direction, the sensor ignores whether or not the partial optical paths located closer to the opening direction, including these blocked optical paths, and outputs a detection signal according to whether or not the partial optical paths are blocked for the optical paths closer to the closing direction than the ignored optical paths, and the water stop plate is provided with a shading portion that protrudes to the other side and blocks the partial optical paths (see Figures 2 and 5).

[0011] The third feature is that the light blocking portion is made of an elastic material in order to absorb the impact caused by contact with an object or the like.

[0012] The fourth feature is that, in order to more effectively prevent water from entering the multi-optical axis sensor, guide rails are provided to guide both widthwise ends of the opening / closing body in the vertical direction, and a lower frame portion is provided to support the opening / closing body on the lower side when it is fully closed, and water stopping portions are provided on both widthwise ends and the lower end side of the water stop plate to contact the guide rails and the lower frame portion to ensure watertightness, and the multi-optical axis sensor is located away from the water stopping portion on the other side in the thickness direction of the opening / closing body (see Figures 2 and 3).

[0013] <Specific embodiment> Next, specific embodiments having the above-mentioned features will be described in detail with reference to the drawings. In the following description, "thickness direction of the opening / closing body" means the thickness direction of the opening / closing body in the closed state. Also, "width direction of the opening / closing body" means a direction that is approximately perpendicular to the opening / closing direction of the opening / closing body, but is not the thickness direction of the opening / closing body. Also, "opening / closing direction of the opening / closing body" means the direction in which the opening / closing body slides to separate or open a space.

[0014] FIG. 1 shows an example of an opening and closing device according to the present invention. This opening / closing device 1 comprises an opening / closing body 10 that performs a closing operation to separate a space, a storage section 20 that stores and extends the opening / closing body 10 on the opening direction side, two guide rails 30, 30 that surround both ends of the opening / closing body 10 in the width direction with a concave cross section and guide it in the vertical direction, a lower frame section 35 (see Figure 2) that faces the lower end of the opening / closing body 10, an object detection sensor 40 (multi-optical axis sensor) that detects objects near the opening / closing body 10, and a control circuit 50. This opening and closing device 1 is attached to an opening in the structure of a garage, factory, etc., and when fully closed, the space on one side (the outdoor side according to Figure 3) that is separated is considered to be an area expected to be flooded, and a water stop plate 12 is used to prevent water that accumulates in the expected flooded area from flowing into the space on the other side (the indoor side according to Figure 3).

[0015] The opening / closing body 10 is formed by connecting multiple slats 11a, which are made by bending a horizontally elongated, approximately rectangular metal plate, so that they can rotate between adjacent slats 11a, 11a above and below, to form the opening / closing body main body 11, and a water stop plate 12 of a predetermined height is connected to the lower end of this opening / closing body main body 11.

[0016] The waterstop 12 comprises a waterstop body 12a, waterstop portions 12b, 12c (see Figures 2 and 3) that contact the guide rail 30 and the lower frame portion 35 to ensure watertightness, and a shading portion 12d that protrudes to the other side (the right side in Figure 2) and blocks some of the multiple light paths R from the object detection sensor 40.

[0017] The waterstop body 12a is a member formed in the shape of a rectangular flat plate with no through-holes in the thickness direction, and both ends in the width direction are fitted into the guide rails 30, 30. The waterstop body 12a may be made of one or more metal plates that have been appropriately processed so as to have no gaps or holes in the thickness direction.

[0018] The waterproof portions 12b and 12c are made of a long rubber material. One of the waterstop portions 12b is disposed in a vertically continuous elongated shape on both widthwise ends of the waterstop body 12a. As shown in Fig. 3, the waterstop portion 12b is integrally attached to the waterstop body 12a via brackets 12e fixed to the widthwise ends of the waterstop body 12a. 2, the other water stop portion 12c is disposed in a continuous, elongated shape in the width direction of the opening / closing body at the lower end side of the water stop plate 12. This water stop portion 12c is fixed integrally to the water stop plate 12 by a bracket or the like (not shown).

[0019] The shading portion 12d is a member that protrudes from the surface of the waterstop main body 12a and blocks two adjacent optical paths R, R above and below, and is located slightly above the lower end of the waterstop main body 12a on one end side of the opening / closing body in the width direction. As shown in FIG. 4, the light-shielding portion 12d has a trapezoidal cross section with inclined surfaces at the top and bottom, and is formed with a predetermined width. According to a preferred example of this embodiment, the light-shielding portion 12d is made of an elastic material such as an elastic synthetic resin material (including, for example, synthetic rubber or elastomer resin), but as other examples, it can also be made of a hard synthetic resin material or a metal material. The means for fixing this light blocking portion 12d to the surface of the waterstop body 12a may be, for example, adhesive bonding, fitting, or fastening with an appropriate fastener (for example, a screw, a bolt, a rivet, a bracket, etc.).

[0020] The storage section 20 is provided with a storage case 21 having an opening at the bottom for allowing the opening / closing body 10 to enter and exit, a winding shaft 22 for winding up and unwinding the opening / closing body 10, an opening / closing machine 23 for driving and rotating the winding shaft 22 and braking it via a power transmission mechanism such as a chain and sprocket, and an opening / closing body control circuit 51 which is part of the control circuit 50 (see Figure 1).

[0021] The opening and closing device 23 is composed of a rotary electric motor, a braking mechanism, and the like. The opening / closing device 23 is provided with a fully closed / fully open sensing unit 23a that outputs a contact signal at the fully closed and fully open positions of the opening / closing body 10. The fully closed / fully open sensing unit 23a is a switch with a mechanical counter structure that outputs a contact signal when the amount of rotation of the rotating part of the opening / closing device 23 reaches a predetermined value.

[0022] The opening / closing body control circuit 51 is an electronic circuit equipped with, for example, a microcomputer, and functions according to a pre-stored program to process the closing operation restriction signal from the object detection sensor 40, signals from the open switch, stop switch and close switch (not shown), and other signals, and controls the opening / closing device 23 according to the processing results.

[0023] The guide rail 30 is configured to surround the widthwise end of the opening / closing body 10 in a concave shape on one side of the opening / closing body in the width direction and guide it in the up and down direction. A waterstop guide portion 31 is provided on the lower end side of this guide rail 30, which fits concavely into the widthwise end of the waterstop 12 and guides the waterstop 12 up and down while maintaining watertightness. Also, a sensor housing portion 32 that houses an object detection sensor 40 is provided on the indoor surface of the guide rail 30 (see Figure 3). The guide rail 30 is fixed to a wall surface (not shown) of a body to which the opening and closing device 1 is to be attached via a bracket or the like (not shown).

[0024] The waterstop guide portion 31 is formed with a concave cross section that surrounds the widthwise end of the waterstop 12 (see Figure 3) and extends in the vertical direction. At the lower end of this waterstop guide portion 31, on the inner surface facing the surface of the waterstop 12 on the side of the expected flooded area, there is provided a guide portion 31a that slides against the lower end of the waterstop 12 and guides the waterstop 12 downward along an inclined surface.

[0025] The sensor housing section 32 is a long member that continues along the indoor side of the guide rail 30 in the opening and closing direction of the opening and closing body, and is fixed to the guide rail 30 with fasteners such as screws or rivets. The sensor housing 32 is composed of a housing case 32a having a concave cross section and an opening facing the indoor side, and a cover 32b that is detachably attached so as to cover the opening.

[0026] The storage case 32a has a plurality of through holes 32a1 arranged at intervals in the vertical direction on the side wall toward the center of the opening / closing body in the width direction of the opening / closing body. Each through hole 32a1 is a hole for passing a light beam from an object detection sensor 40 (described later) (see FIG. 3).

[0027] One end of the cover portion 32b in the opening / closing body width direction is detachably fitted to the storage case portion 32a, and the other end is fastened to the storage case portion 32a with a detachable fastener such as a screw or bolt (see FIG. 3).

[0028] The lower frame portion 35 is continuous between the left and right guide rails 30, 30 at the lower end side of the opening opened and closed by the opening / closing body 10, and is provided opposite the lower end surface of the opening / closing body 10 when fully closed. The lower frame 35 is provided with a protruding piece 35a that protrudes upward on the indoor side of the opening-closing body 10. The protruding piece 35a continues in the width direction of the opening-closing body 10 along the opening-closing body 10. The protruding piece 35a comes into watertight contact with the water stopping part 12c on the lower end side of the opening-closing body 10 when fully closed (see FIG. 2(b)).

[0029] Therefore, when the opening / closing body 10 is fully closed, the water stop portion 12b is pressed against the inner surface of the water stop guide portion 31 at the end in the width direction (see FIG. 3), and the water stop portion 12c is pressed against the lower frame portion 35 at the lower end (see FIG. 2), substantially closing the gaps on both sides and the lower end of the water stop 12. Therefore, even if rainwater or the like accumulates on the side of the expected flooding area (the outdoor side in the illustrated example), this water is prevented from entering the indoor side.

[0030] The object detection sensor 40 has a pair of light-emitting units 40a1 and light-receiving units 40b1 (photoelectric sensors) arranged in large numbers in the vertical direction close to the water stop 12 from the indoor side, and is arranged away from the water stop units 12b and 12c on the indoor side as shown in the figure. The object sensor 40 forms a number of optical paths R using the light projecting portion 40a1 and the light receiving portion 40b1, and detects when an object blocks at least a part of these optical paths.

[0031] In more detail, this object detection sensor 40 comprises a first unit 40a extending vertically within one side of the guide rail 30 and a second unit 40b extending vertically within the opposite side of the guide rail 30, and forms a number of optical paths R spaced apart vertically along the opening and closing path of the opening and closing body 10. The signal output from the object detection sensor 40 is treated as a closing operation limiting signal for limiting the closing operation of the opening / closing body 10.

[0032] The first unit 40a and the second unit 40b are each positioned a predetermined distance H away from the seating target area G (e.g., the lower frame, floor, ground, etc.) of the opening / closing body 10 when fully closed, in the opening direction, and are fixed within the sensor accommodating section 32. The predetermined dimension H is set within a range of 150 to 1500 mm, and more preferably within a range of 150 to 500 mm.

[0033] The first unit 40a is configured in a vertically elongated cubic shape and has a number of light-projecting units 40a1 spaced at approximately regular intervals along its length. These light-projecting units 40a1 are supplied with power from electrical wiring e1 inside the sensor housing 32 and emit light (e.g., infrared rays) as an obstacle detection medium. A connection portion 40a2 between the electrical wiring e1 and the first unit 40a is located above the upper end of the waterstop 12 in the fully closed position.

[0034] The second unit 40b is configured in the shape of a cube that is long in the vertical direction, and is equipped with a number of light receiving units 40b1 spaced at approximately regular intervals along its length, and a sensor control circuit 41 that outputs a signal according to the sensing state of these light receiving units 40b1, and the output signal of the sensor control circuit 41 is conducted to a control circuit 50 in the storage unit 20 via electrical wiring e2. The connection portion 40b2 between the electrical wiring e2 and the second unit 40b, and the sensor control circuit 41 are located above the upper end of the waterstop 12 in the fully closed position.

[0035] Furthermore, power supply circuits, amplifiers, and other electronic circuits (not shown) that supply power to the first unit 40a and / or second unit 40b are also positioned above the upper end of the waterstop 12 when in the fully closed position.

[0036] The control circuit 50 is made up of the above-mentioned opening / closing body control circuit 51 and sensor control circuit 41, and controls the operation of the opening / closing device 1 by cooperation between these two control circuits 51, 41. It should be noted that this control circuit 50 can be configured as a single unit or as three or more units (not shown) as long as it is disposed above the water stop plate 12 in the fully closed position. When a plurality of control circuits 50 are provided, the allocation of functions such as blanking mode, normal sensing mode, and other controls, which will be described later, can be set arbitrarily. Furthermore, when a single control circuit 50 is used, this single control circuit (for example, the opening / closing body control circuit 51) performs all of the controls such as the blanking mode and normal sensing mode described below.

[0037] Next, the basic operations of the sensor control circuit 41 and the opening / closing member control circuit 51 will be described. The sensor control circuit 41 executes either the blanking control mode or the normal sensing mode according to a predetermined condition.

[0038] <Blanking control mode> The blanking control mode is a mode that is executed when the light blocking portion 12d passes through a number of optical paths R of the object detecting sensor 40 during the closing operation of the opening / closing body 10. In this blanking control mode, each time two or more of the multiple optical paths are blocked by the shading section 12d in the closing direction, the sensor control circuit 41 ignores whether or not the optical paths located closer to the opening direction, including these blocked optical paths, are blocked, and turns the output of the closing operation restriction signal described later ON or OFF depending on whether or not the optical paths closer to the closing direction than the ignored optical paths are blocked. Here, the "optical paths located closer to the opening direction, including the blocked optical path" refers to all optical paths equal to or greater than optical path R1, which are adjacent to the lower side of the two optical paths blocked by light-shielding portion 12d in the order of the closing direction, according to the example shown in FIG. 1.

[0039] As an example other than the illustrated example, the "optical paths located closer to the opening direction, including the blocked optical path" can be all optical paths located above the optical path R1, excluding the optical path R1.

[0040] The closing operation limiting signal is a signal for limiting 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.

[0041] 5(a), the sensor control circuit 41 determines whether at least one of a plurality of predetermined optical paths R below the optical path R1 directly below the light-shielding portion 12d is blocked (step S1), and if so, turns on the output of the closing operation limiting signal (step S2), and if not, turns off the output of the closing operation limiting signal (step S3). After that, the process returns to step S1. In one example of this embodiment, of the multiple optical paths R, the two lowest optical paths R are dedicated to detecting that the light-shielding portion 12d has reached the lower end of the object detection sensor 40, and are not used to detect obstacles; however, in another example, these two optical paths R can also be used to detect obstacles.

[0042] <About normal detection mode> The normal sensing mode is executed when a reset operation is performed under a predetermined condition, such as a signal when the power is turned on or a signal when the two uppermost optical paths R are blocked in the closing direction in sequence. In this normal sensing mode, the sensor control circuit 41 turns ON or OFF the output of the closing operation limiting signal for the multiple normal sensing light paths R depending on whether or not at least some of them are blocked, regardless of the order of the closing directions. Here, the "normal sensing optical paths R" are multiple optical paths R located between the two upper and lower optical paths R, R closest to the opening direction and the two upper and lower optical paths R, R closest to the closing direction. The two upper and lower optical paths R, R closest to the opening direction and the two upper and lower optical paths R, R closest to the closing direction are used to sense when the light-blocking portion 12d enters or leaves the sensing area of ​​the object detection sensor 40.

[0043] 5(b), in the normal detection mode, the sensor control circuit 41 determines whether at least some of the normal detection light paths R are blocked, and if so, proceeds to step S22 to turn on the output of the closing operation limiting signal, and if not, proceeds to step S23 to turn off the output of the closing operation limiting signal, after which the process returns to step S21.

[0044] When a closing operation restriction signal is input from the sensor control circuit 41, the opening / closing body control circuit 51 restricts the closing operation of the opening / closing body 10 by controlling the opening / closing mechanism 23 to stop the closing operation of the opening / closing body 10, or by prohibiting the closing operation of the opening / closing body 10 even if a closing signal is received from a closing switch or the like. The opening / closing body 10 can be stopped by operating a stop switch (not shown) at any point in the steps described above.

[0045] Next, the characteristic functions and effects of the opening and closing device 1 having the above configuration will be described in detail. In the opening and closing device 1 configured as described above, the object detection sensor 40 is located in the space on the opposite side of the expected flooding area in the thickness direction of the opening and closing body (on the indoor side in the illustrated example), away from the water stopping parts 12b, 12c and above the contact target part G. Therefore, even if water accumulates in the expected flooding area when the opening and closing body 10 is in the fully closed state, the object detection sensor 40 can be prevented from being flooded, and even if a small amount of water flows to the indoor side due to deterioration or damage to the water stopping parts 12b, 12c, the object detection sensor 40 can be prevented from being flooded.

[0046] Furthermore, since the connection parts 40a2, 40b2 of the electrical wiring e1, e2, the sensor control circuit 41, and the opening / closing body control circuit 51, etc. are located above the upper end of the water stop plate 12 when it is in the fully closed position, it is possible to prevent the connection parts of these electrical wiring and electronic components, etc. from becoming waterlogged, which could cause short circuits or poor insulation.

[0047] Furthermore, blanking control is performed by the light-shielding portion 12d that protrudes in the thickness direction at the lower end side of the opening-closing body 10, thereby reducing problems caused by bending of the opening-closing body 10. In other words, if blanking control were not performed, there is a risk that the opening-closing body 10 bending due to wind or vibration would be detected by the object detection sensor 40, causing the closing operation of the opening-closing body 10 to stop. However, according to the opening-closing device 1, blanking control is performed by the light-shielding portion 12d, so such problems can be prevented. Furthermore, since the light-shielding portion 12d is made of an elastic material, it is possible to prevent the light-shielding portion 12d from coming into contact with an object and giving a strong impact thereto.

[0048] <Modification> According to the opening and closing device 1 of the above embodiment, the first unit 40a and the second unit 40b constituting the object detection sensor 40 are each directly mounted in the sensor accommodating section 32. However, as another example, the first unit 40a and the second unit 40b may each be housed in a waterproof case 60 shown in FIG. 6 and mounted in this housed state in the sensor accommodating section 32. The waterproof case 60 is formed in the shape of a hollow box that watertightly covers the first unit 40a and the second unit 40b at least below the upper end of the waterstop 12 in the fully closed position. The outer wall of this waterproof case 60 is provided with a light-transmitting portion 61 that enables the formation of an optical path R.

[0049] In more detail, the waterproof case 60 in the illustrated example is formed as a bottomed cylinder having an opening 60a at the upper end and a bottom 60b at the lower end, as shown in Figure 6, and has a plurality of light-emitting sections 61 on its peripheral wall, arranged in accordance with the pitch of the light-emitting sections 40a1 or light-receiving sections 40b1 of the object detection sensor 40. Each light projecting portion 61 is formed from a light-transmitting material such as an acrylic resin plate, a glass plate, etc. As another example, a light projecting portion (not shown) that is long in the vertical direction can transmit a plurality of light paths R, or the entire waterproof case 60 can be formed from a light-transmitting material.

[0050] The waterproof case 60 in the illustrated example is formed to be longer than the overall vertical length of the first unit 40a or the second unit 40b, and contains the first unit 40a or the second unit 40b, the sensor control circuit 41, the connection parts of the electrical wiring e1, e2, etc. Therefore, by using this waterproof case 60, the waterproof performance of the object detection sensor 40 can be further improved, and assembly and maintenance are also easy.

[0051] As another example of the waterproof case 60, it may be configured to cover only the lower half of the first unit 40a or the second unit 40b, and in this case, it is preferable to cover at least the portion corresponding to the lower side of the upper end of the water stop plate 12 when in the fully closed position.

[0052] Furthermore, the present invention is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present invention. [Explanation of symbols]

[0053] 1: Switchgear 10: Opening and closing body 12: Waterstop 12a: Waterstop body 12b,12c: Water stop part 12d: Light shielding part 40: Object detection sensor (multi-axis sensor) 40a: First unit 40b: Second unit 40a2, 40b2: Connection part 41: Sensor control circuit 50: Control circuit 51: Opening and closing body control circuit 60: Waterproof case 61:Transparent part e1, e2: Electrical wiring R,R1: Optical path

Claims

1. An opening and closing device including an opening and closing body that performs a downward closing operation so as to partition a space, and a multi-optical axis sensor that forms multiple optical paths for detecting objects using multiple pairs of light-emitting units and light-receiving units that are arranged in a vertical direction, The lower side of the opening / closing body is provided with a water stop plate of a predetermined height, which is regarded as a flood-prone area when the opening / closing body is fully closed, and which prevents water from accumulating in the flood-prone area from flowing into the other space. The opening and closing device is characterized in that the multi-optical axis sensor has the pair of light-emitting unit and light-receiving unit disposed in the space on the other side, spaced apart from the waterstop.

2. the multi-optical axis sensor has a blanking control mode in which, every time two or more partial optical paths among the multiple optical paths are blocked in the closing direction, the presence or absence of blockage is ignored for optical paths located closer to the opening direction, including these blocked optical paths, and a detection signal according to the presence or absence of blockage is output for optical paths closer to the closing direction than the ignored optical paths, The opening and closing device according to claim 1, wherein the water stop plate is provided with a light blocking portion that protrudes to the other side and blocks the part of the light path.

3. 3. The opening and closing device according to claim 2, wherein the light blocking portion is made of an elastic material.

4. a guide rail for vertically guiding both widthwise ends of the opening / closing body, and a lower frame for receiving the opening / closing body on a lower side when the opening / closing body is fully closed; Water stop portions are provided on both widthwise ends and the lower end of the water stop plate to contact the guide rail and the lower frame portion to ensure watertightness, 4. The opening and closing device according to claim 1, wherein the multi-optical axis sensor is positioned away from the water blocking portion on the other side in the thickness direction of the opening and closing body.

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