Switchgear

Abstract

To provide a notification easily recognizable.SOLUTION: An open / close device includes: an open / close body 10 which opens / closes along an opening part A between an open position and a closed position; guide rails 20 which guides the open / close body 10 in an open / close direction; a storage part 30 which stores the opened open / close body 10 in an open direction side; and a notification part 50 which gives a notification. The notification part 50 gives various types of notifications according to an open / close state of the open / close body 10.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an opening and closing device in which an opening and closing body opens and closes between an open position and a closed position along an opening. [Background technology]

[0002] Conventional inventions of this type include, for example, an opening / closing device as described in Patent Document 1, which, when a pedestrian (including a vehicle, etc.) approaches an opening / closing body, detects the pedestrian using a sensor, quickly opens the sheet-like opening / closing body to the fully open position, and then automatically closes the opening / closing body to the fully closed position at high speed after the pedestrian, etc. has passed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-169588 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above-mentioned conventional technology, if a passerby misinterprets the open / closed state of the opening / closing body or the timing of automatic closure, this could lead to a vehicle colliding with the opening / closing body or contact between a vehicle passing through the opening and a passerby. [Means for solving the problem]

[0005] In view of the above problems, the present invention has the following configuration. The device includes an opening / closing body that opens and closes between an open position and a closed position along an opening, a guide rail that guides the opening / closing body in the opening / closing direction, a storage section that stores the opening / closing body on the opening direction side when opened, and an alarm section that issues different types of alarms depending on the open / closed state of the opening / closing body. Projecting an image onto a specific location I tried to An opening and closing device, wherein the notification image includes a first notification image projected onto a passageway along a direction passing through the opening, and a second notification image projected onto the passageway along a width direction of the opening, and the notification unit switches between projecting the first notification image and projecting the second notification image depending on the open / close state of the opening and closing body. A switching device characterized by: [Effects of the Invention]

[0006] Since the present invention is configured as described above, it is possible to provide an easily recognizable notification. [Brief explanation of the drawings]

[0007] [Figure 1] 1A and 1B are perspective views showing an example of an opening / closing device according to the present invention, showing states before and after projection of a notification image for warning people to be careful when crossing, respectively. [Figure 2] 1A and 1B are perspective views showing an example of an opening and closing device according to the present invention, in which a flashing state and a lit state of a notification image for a stop warning are shown in FIG. [Figure 3] FIG. 2 is a block diagram showing an example of a control system of the switching device. [Figure 4] 1 and 2, is a flowchart showing an example of control of a notification unit. [Figure 5] FIG. 10 is a perspective view showing another example of a notification image for a stop warning projected onto the floor. [Figure 6] FIG. 10 is a perspective view showing another example of a notification image for a stop warning projected onto an opening / closing body. [Figure 7] 10A and 10B are perspective views showing another example of a notification image for warning a driver to stop projected, showing the state before and after a passing vehicle approaches the opening / closing body, respectively. [Figure 8] FIG. 10 is a perspective view showing another example of a notification image for warning to stop, in which the time until the opening / closing body automatically closes is projected. [Figure 9] 10 is a perspective view showing a state in which a notification image indicating that interlock control is being performed is projected on a plurality of opening / closing devices lined up in the passing direction. FIG. [Figure 10] FIG. 10 is a block diagram showing another example of a control system. [Figure 11] FIG. 10 is a perspective view showing another example of an opening and closing device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] This embodiment discloses the following features. The first feature is that the device comprises an opening / closing body that opens and closes between an open position and a closed position along an opening, a guide rail that guides the opening / closing body in the opening / closing direction, a storage section that stores the opening / closing body on the opening direction side when opened, and an alarm section that issues an alarm, The notification unit issues different types of notification depending on the open / closed state of the opening / closing body (see FIGS. 1 to 2 and 4).

[0009] Here, the open position includes a position where the opening / closing body has opened a predetermined amount and stopped, a position where the opening / closing body has opened a predetermined amount and switched to a closing operation, etc. Furthermore, the open position includes a fully open position and a partially open position. Similarly, the closed position includes a position where the opening / closing body has closed a predetermined amount from the open position and stopped, a position where the opening / closing body has closed a predetermined amount from the open position and switched to an opening operation, etc. Furthermore, the closed position includes a fully closed position and a partially closed position.

[0010] As a second feature, the notification unit projects different types of notification images onto predetermined locations as the different types of notifications (see FIGS. 1 to 2 and 4). Here, the notification image includes images such as letters, figures, and symbols.

[0011] As a third feature, the different types of notification images are notification images with different shapes (see FIGS. 1 and 2).

[0012] As a fourth feature, the notification unit projects the different types of notification images at different positions (see FIGS. 1 and 2).

[0013] As a fifth feature, the notification unit switches between flashing and lighting of the notification image depending on the open / close state of the opening / closing body (see FIG. 2).

[0014] As a sixth feature, the alarm image includes a first alarm image projected onto the passageway along the direction of passing through the opening, and a second alarm image projected onto the passageway along the width direction of the opening, and the alarm unit switches between projecting the first alarm image and projecting the second alarm image depending on the open / closed state of the opening / closing body.

[0015] <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" refers to the thickness direction of the opening / closing body in the closed state, and "width direction of the opening / closing body" refers to 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.

[0016] The opening / closing device 1 includes an opening / closing body 10 that opens and closes along the opening A between an open position (fully open position in the illustrated example) and a closed position (fully closed position in the illustrated example), a guide rail 20 that guides the opening / closing body 10 in the opening / closing direction, a storage section 30 that stores the opening / closing body 10 on the opening direction side when opened, a detection section 40 that detects a pedestrian X on the entrance side of the opening A, an alarm section 50 that issues an alarm to the pedestrian X, a pedestrian Y, etc., an opening / closing control section 60 that controls the opening / closing operation of the opening / closing body 10, and an alarm control section 70 that controls the alarm section 50 (see FIGS. 1 to 10).

[0017] Passenger X includes a pedestrian who is about to pass through opening A, a vehicle, a vehicle driver, etc., and in the illustrated example, it is a vehicle that is about to pass through opening A. Also, in the figure, the symbol Y indicates a traverser who is about to cross the passage in the direction passing through the opening A.

[0018] The opening / closing body 10 integrally comprises a flexible sheet-like opening / closing body main body 11 and a seat plate portion 12 connected to the lowest end of the opening / closing body main body 11, and operates to open and close the opening A by partitioning it.

[0019] The opening / closing body main body 11 is formed of a rectangular flexible sheet having a width sufficient to cover almost the entire surface of the opening A. The flexible sheet is, for example, a flame-retardant fabric such as glass cloth or silica cloth, a fluorine-treated vinyl chloride resin sheet material, or a synthetic resin sheet material containing glass fiber, and is preferably made of a smoke-proof and fire-resistant (including flame-retardant) flexible sheet material. The upper end of the opening / closing body main body 11 is connected to the outer periphery of a winding shaft (not shown) that rotates inside the storage section 30. Furthermore, a number of engaging elements (not shown) are provided in the opening and closing direction on the left and right ends of the opening and closing body main body 11. These engaging elements mesh with an opening and closing drive gear (shown) that rotates in conjunction with the winding shaft, enabling high-speed opening and closing of the opening and closing body 10. In the drawing, reference numeral 13 denotes a window portion made of a transparent sheet or the like.

[0020] The seat plate portion 12 is connected to the lower end of the opening / closing body main body 11 over approximately the entire width of the opening / closing body 10, improving the closing ability of the opening / closing body 10 and pulling the opening / closing body main body 11 downward by its own weight, preventing bending, wrinkles, etc. from occurring in the opening / closing body main body 11. The seat plate portion 12 is configured by forming a section with a bag-like cross section at the lower end of the opening / closing body main body 11 made of a sheet material, and accommodating a weight inside the bag-like portion.

[0021] The guide rails 20 are provided on both widthwise end sides of the opening / closing body 10. Each guide rail 20 surrounds the widthwise end side of the opening / closing body 10 with a concave cross section and guides it in the opening / closing direction. The left and right guide rails 20, 20 are provided with obstacle sensors (not shown) that detect obstacles below the opening / closing body 10. These obstacle sensors are, for example, photoelectric sensors that capture infrared rays emitted from a light-emitting unit using a capturing unit, and transmit an obstacle detection signal to the opening / closing control unit 60 when the infrared rays are blocked by an obstacle.

[0022] The storage section 30 includes, within a storage case 31, a winding shaft (not shown) for winding and unwinding the opening / closing body 10, an opening / closing drive gear (shown), and an opening / closing machine 32 (see Figure 3) that serves as the drive source for these.

[0023] The opening / closing device 32 is also provided with an opening / closing state sensing unit (not shown) that senses whether the opening / closing body 10 is in the open position or the closed position and outputs the sensing signal as an opening / closing state signal. This open / closed state sensing unit is a switch that outputs a signal when the amount of rotation of the rotating part of the opening / closing device 32 reaches a predetermined value, and for example, a well-known structure that combines a mechanical counter and a limit switch can be applied. The opening / closing state signal includes an open stop signal indicating that the opening / closing body 10 is stopped in the open position (fully open position in the illustrated example), and further includes a closed stop signal indicating that the opening / closing body 10 is stopped in the closed position, as necessary. These signals are transmitted from the opening / closing device 32 to the opening / closing control unit 60 (see FIG. 3).

[0024] The sensing unit 40 is a sensor that uses infrared rays, ultrasonic waves, visible light, laser light, etc. as a detection medium to sense objects within a set range in a non-contact manner, and is sometimes called an area sensor, etc. (see FIG. 7). The sensor 40 is attached to the outer surface of the storage section 30, and when it senses a passerby X entering the opening A, it transmits a sensed signal (passerby sensed signal) to the opening / closing control section 60 and inputs it. As other examples of the sensing unit 40, a phototube sensor, a pyroelectric infrared sensor, a 3D sensor using a stereo camera, a ToF camera, or the like can be used.

[0025] The notification unit 50 is a device that projects different types of notification images of predetermined shapes onto a predetermined location. According to the example shown in Figures 1 and 2, the predetermined location is a stationary surface (passage floor) facing the closing direction end of the opening / closing body 10. The notification unit 50 may be any device that projects one or more projection images using light such as an LED, and may be, for example, a device called a projector or a line light. As a mode of the notification unit 50, a plurality of notification units 50 may project different notification images, or a single notification unit 50 may project a plurality of types of notification images. The notification unit 50 in the illustrated example is provided on the underside of the storage unit 30 so as to be able to project a wide range from the entrance side of the opening A to the passing-through side. As another example, the notification unit 50 may be provided inside the storage unit 30, and a through-hole or light-projecting unit or the like may be provided on the outer wall surface of the storage unit 30 to allow light from the notification unit 50 to pass through.

[0026] The switching control unit 60 is an electric circuit equipped with a sequencer, a relay circuit, etc., and controls the switching device 32 and transmits a signal to the notification control unit 70 in response to an input signal.

[0027] 3, the input signals to the opening / closing control unit 60 include a mode signal, an open / close / stop signal, etc. Furthermore, the input signals include the passerby detection signal, the obstacle detection signal, the open / close state signal, etc.

[0028] The mode signal indicates whether the mode is automatic or manual, and can be switched between these modes by a special operation on an operation switch or by an operation not shown. The automatic mode is a mode in which the opening / closing body 10, which has been set to the open position (fully open position in the illustrated example) in response to the detection signal from the detection unit 40 or operation of the open button on the operating switch, automatically closes to the closed position (fully closed position in the illustrated example) after a predetermined time has elapsed. The manual mode is a mode in which the opening / closing body 10 is manually operated by an operation switch or the like to open to the open position or close to the closed position.

[0029] The open / close / stop signals are signals output by an operation switch (not shown), and include an open signal for opening the opening / closing body 10, a close signal for closing the opening / closing body 10, and a stop signal for stopping the opening / closing operation of the opening / closing body 10.

[0030] The opening / closing control unit 60 transmits the mode signal and the opening / closing body state signal among the above-mentioned input signals to the notification control unit 70 (see FIG. 3). Note that the signals output by the opening / closing control unit 60 may be relay contact signals of an electric circuit constituting the opening / closing control unit 60 instead of the mode signal and the opening / closing body state signal.

[0031] The opening / closing control unit 60 controls the opening / closing operation of the opening / closing body 10 by rotating the opening / closing device 32 forward, reverse, stopping, etc., based on the opening / closing operation commands (signals, power, etc.) issued in response to the above-mentioned input signals (see Figure 3).

[0032] The notification control unit 70 is an electric circuit including, for example, a microcomputer, a storage device, a relay circuit, etc., and operates according to a pre-stored program. The notification control unit 70 controls the notification unit 50 (turning on, turning off, blinking, etc.) to issue different types of notifications based on notification commands (signals, power, etc.) issued in response to the mode signal input as described above, the open / close state signal, etc. Specific examples of this notification include projecting notification images of different shapes at different positions, as shown in Fig. 1(b) and Fig. 2(a)(b).

[0033] <Control example> Next, an example of control by the notification control unit 70 will be described in detail with reference to the flowchart of FIG. First, the notification control unit 70 determines whether or not the automatic mode is selected in response to an input signal from the opening / closing control unit 60 (step S1), and if the automatic mode is selected, proceeds to the next step, and if not, waits until the automatic mode is selected.

[0034] In the next step S2, it is determined whether the opening stop signal is ON or not from the opening / closing status signal received from the opening / closing control unit 60. If the opening stop signal is ON, it is assumed that the opening / closing body 10 is in a predetermined open position (fully open position in the illustrated example), and processing proceeds to the next step; if not, processing jumps to step S8.

[0035] In the next step S3, a first notification image L1 for advising the driver to cross is projected onto the passage. This first notification image L1 is two parallel linear images located on both sides of the passage along the direction of passing through the opening (see FIG. 1(b)). In a preferred example, the first notification image L1 is formed as a straight line spanning the opening A in the passage direction. The first notification image L1 is a graphic for warning a pedestrian Y who is about to cross the passage on which the pedestrian X is passing to stop. As another example of the first notification image L1, an image that urges a person approaching the opening / closing body 10 to stop may be used.

[0036] In the next step S4, it is determined whether the opening stop signal is OFF or not based on the opening / closing status signal received from the opening / closing control unit 60. If the opening stop signal is OFF, it is assumed that the opening / closing body 10 is not in the open position but is in the closing operation or in the closed position, and processing proceeds to the next step; otherwise, processing returns to step S3.

[0037] In the next step S5, the first notification image L1 is turned off, and in the next step S6, the second notification image L2 is projected while flashing (see FIG. 2(c)). The second notification image L2 is a graphic that warns the pedestrian X (vehicle) to stop, and in the illustrated example, is a linear image that is projected onto the passage along the width direction of the opening A. Two second notification images L2 are provided substantially parallel to each other, on either side of the opening A. The dashed lines in Fig. 2(c) indicate that the second notification image L2 is flashing.

[0038] In the next step S7, it is determined whether a predetermined time (2 seconds in the illustrated example) has elapsed since the opening stop signal was turned OFF, and if so, the process proceeds to the next step; if not, the process returns to step S3.

[0039] In the next step S8, the second notification image L2 for advising to stop is switched from a flashing state to a lighting state (see FIG. 2(d)), and the process then returns to step S1.

[0040] Therefore, according to the control example shown in Figure 4, in the open state, a pedestrian Y who is about to enter the path of a pedestrian X (vehicle) can be made to see the first alarm image L1, providing an easily recognizable warning to avoid contact with the pedestrian X. In addition, when the opening / closing body 10 is in the closing operation or has stopped closing due to the automatic mode function, the second warning image L2 flashes and lights up to provide an easily recognizable warning to passersby X so as not to collide with the opening / closing body 10.

[0041] <Modification> Next, modified examples of the opening and closing device 1 having the above configuration, in which some parts are changed or functions are added, will be described.

[0042] FIG. 5 shows an example in which an "!" mark is projected and displayed by the notification unit 50 as a second notification image L2 for urging a passerby X (vehicle) to stop. In this way, the first notification image L1 and the second notification image L2 projected by the notification unit 50 may be images corresponding to the notification content, and other examples include marks such as arrows, letters, numbers, pictures, figures, etc.

[0043] In FIG. 6, the second notification image L2 is displayed on the surface of the opening / closing body 10. In FIG. In this way, the areas onto which the first alarm image L1 and the second alarm image L2 are projected can be the floor of the passage, the surface of the opening / closing body 10 (see Figure 6), the guide rail 20, the storage section 30, the wall of the main body on which the opening / closing device 1 is installed, etc.

[0044] FIG. 7 shows a graphic representing the sensing area of ​​the sensing unit 40 projected and displayed as a second notification image L2 for urging the pedestrian X (vehicle) to stop. This figure is projected in the form of a rectangular frame by the notification unit 50 onto the passage surface on the approach side of the opening A (see FIG. 7(a)). According to this embodiment, the passerby X is prompted to stop in front of the opening / closing body 10 and can be made aware of the sensing area of ​​the sensing unit 40.

[0045] Furthermore, Figure 7(b) shows a figure L3 (an arrow mark in the illustrated example) projected onto the back side of the opening / closing body 10, which is the pass-through side of the opening A, to warn of the passage of pedestrian X (vehicle). In this embodiment, a notification unit 50 is also provided separately on the rear surface of the storage unit 30. This notification unit 50 can project the figure L3 even when the opening / closing body 10 is in the closed state. In addition, in a preferred example of this aspect, the figure L3 is projected and displayed on the condition that the sensor 40 detects a passerby X. According to this example, it is possible to notify people on the back side of the opening-closing body 10 that the opening-closing body 10 is about to open and that a passerby X is about to pass through.

[0046] Figure 8 shows a projection of a figure L4 indicating the time until automatic closure when the opening / closing body 10 in the open position automatically closes after a predetermined time has elapsed in the automatic mode by the notification unit 50. According to the illustrated example, the graphic L4 is a number, and is displayed as a countdown (for example, "5," "4," "3," "2," "1," etc.) according to the time until the automatic closing. According to this embodiment, the passerby X can be made aware of the timing when the opening / closing body 10 will automatically close.

[0047] FIG. 9 shows two opening / closing devices 1 provided so that two opening / closing bodies 10 are arranged side by side in the traveling direction of a pedestrian X, and these two opening / closing devices 1 are interlock-controlled. This interlock control is a control that prevents the other opening / closing body 10 (the near side in the illustrated example) from opening when one opening / closing body 10 (the front side in the illustrated example) is not in the closed position (for example, when it is in the opening operation or in the open position). When either of the opening / closing bodies 10 is not in the closed position due to the interlock control, the notification control unit 70 lights up the notification image L5 by projection from the notification unit 50. After that, when either of the opening / closing bodies 10 is in the closed position, the notification control unit 70 turns off the notification image L5. In the illustrated example, the notification image L5 is a projection image of a stop line that is approximately parallel to the surface of the opening / closing body 10, and a character image indicating that the interlock is in progress. According to this embodiment, the passerby X can be made aware of the progress of the interlock control.

[0048] In the above embodiment, the control system shown in FIG. 3 can be replaced with the control system shown in FIG. In the control system shown in Fig. 10, input signals to the notification control unit 70 include a mode signal, an open / close signal, a passerby detection signal, etc. Also, input signals to the opening / closing control unit 60 include a stop signal and an obstacle detection signal. The notification control unit 70 transmits a mode signal, an open / close signal, a passerby detection signal, etc. to the opening / closing control unit 60, and receives an open / close state signal from the opening / closing control unit 60. The notification control unit 70 then controls the notification unit 50 by issuing a notification command (signal) in response to an input signal, etc. The switching control unit 60 receives an opening / closing state signal from the switch 32 and transmits the signal to the notification control unit 70. The switching control unit 60 also controls the switch 32 by an opening / closing operation command issued in response to an input signal or the like. Therefore, the control system shown in FIG. 10 can also provide the same effects as the control system shown in FIG.

[0049] An opening and closing device 1' shown in FIG. 11 has an object size sensing unit 80 added to the opening and closing device 1 described above. The object size sensing unit 80 senses the width of the object X including the transported object x1, and transmits a sensing signal corresponding to the width. A specific example of the object size sensing unit 80 can be a non-contact sensor that is substantially the same as the sensing unit 40. Furthermore, as another example of the object size sensing unit 80, it is also possible to use a configuration in which the width dimension of the passerby X is recognized by photographing the passerby X with an imaging device (e.g., a CCD camera) or the like and processing the photographed data. The control unit (not shown) of this opening / closing device 1' determines whether the object X, including the transported object x1, can pass through the opening A based on the detection signal from the object size detection unit 80, and if it determines that the object X cannot pass through, it displays the second notification image L2 by the alarm unit 50 and does not open the opening / closing body 10, and if it determines that the object X can pass through, it turns off the second notification image L2 by the alarm unit 50 and opens the opening / closing body 10. Therefore, according to this opening / closing device 1', it is possible to prevent an excessively large load x1 from colliding with the opening / closing device 1' when passing through the opening A. As another example, the object size sensing unit 80 may sense the height of the pedestrian X including the transported object x1, and the above-mentioned judgment and control may be performed according to the height.

[0050] Some of the above embodiments project different types of notification images, such as notification images with different shapes or positions, or notifications that switch from flashing to lighting up, but as another example, it is also possible to project notification images of different colors.

[0051] In addition, in the various aspects described above, notification is performed only by the notification image projected by the notification unit 50, but as other examples, it is also possible for the notification unit 50 to emit a notification sound while projecting a notification image, or to switch between the notification image and the notification sound depending on the open / close state of the opening / closing body 10. In this case, the notification unit 50 is equipped with a speaker, a storage device for storing audio data, etc. As a further example, the notification unit 50 may emit different types of notification sounds in a switching manner depending on the open / closed state of the opening / closing body.

[0052] Furthermore, according to the above embodiment, the passageway in the direction passing through the opening A is a passageway on the floor surface inside the building, but this passageway may be any passageway that extends to pass through the opening A, and may be a passageway on a concrete surface or earth surface regardless of whether it is inside or outside the building. Furthermore, when the opening and closing device 1 is installed on a moving conveyor, the conveyor may be the passageway, or when the opening and closing device 1 is installed on a waterway through which ships pass, the waterway may be the passageway.

[0053] Furthermore, in the embodiments shown in Figures 1, 2, 5, 7 to 9, 11, etc., the predetermined location onto which the abandoned image is projected is a stationary surface (floor surface of the passageway) facing the closing direction end of the opening / closing body 10. However, as another example, when the opening / closing device 1 is installed on a moving conveyor, the moving surface on the conveyor can be the predetermined location, or when the opening / closing device 1 is installed on a waterway, the water surface on the waterway can be the predetermined location.

[0054] 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]

[0055] 1,1': Switchgear 10: Opening and closing body 20: Guide rail 30: Storage area 40: Sensing part 50: Information Department 60: Opening and closing control section 70: Notification control unit 80: Object size sensor A: Opening X: Passerby Y: Crossing person

Claims

1. The device comprises an opening / closing body that opens and closes between an open position and a closed position along an opening, a guide rail that guides the opening / closing body in the opening / closing direction, a storage section that stores the opening / closing body on the opening direction side when opened, and an alarm section that issues an alarm, An opening and closing device in which different types of notification images are projected onto a predetermined location by the notification unit depending on the open / closed state of the opening and closing body, The notification image includes a first notification image projected onto the passage along a direction passing through the opening, and a second notification image projected onto the passage along a width direction of the opening, The notification unit switches between projecting the first notification image and projecting the second notification image depending on the open / close state of the opening / closing body. A switching device characterized by:

2. 2. The opening and closing device according to claim 1, wherein the different types of notification images have different shapes.

3. The opening and closing device according to claim 1 or 2, wherein the notification unit projects the different types of notification images at different positions.

4. 4. The opening and closing device according to claim 1, wherein the notification unit switches between flashing and lighting of the notification image depending on the open / closed state of the opening and closing body.

5. The device comprises an opening / closing body that opens and closes between an open position and a closed position along an opening, a guide rail that guides the opening / closing body in the opening / closing direction, a storage section that stores the opening / closing body on the opening direction side when opened, and an alarm section that issues an alarm, An opening and closing device in which the notification unit projects a plurality of types of notification images corresponding to notification contents onto a predetermined position using at least one of marks, letters, numbers, pictures, and figures depending on the open / closed state of the opening and closing body, The notification unit is provided on both the entrance side and the pass-through side of the opening, and the notification image includes an image on the entrance side of the opening that indicates a message urging pedestrians to stop, and an image on the pass-through side of the opening that indicates a message informing pedestrians that they will pass through. A switching device characterized by:

6. The image indicating the content of the notice of the pedestrian passing through the opening is projected on the passing side of the opening on the condition that a pedestrian is detected. The opening and closing device according to claim 5 .

Images