Shutter device

Abstract

To prevent erroneous detection caused by the change in the amount of light received in a light receiver of a multiple optical axis sensor, according to the opening / closing position of a shutter curtain.SOLUTION: A shutter device includes obstacle detection means using a multiple optical sensor (light projecting unit 7, light receiving unit 8). The obstacle detection means, by using a light receiving signal of each light receiver 81 and each calibration value stored in a memory, outputs an obstacle detection signal when an optical axis is determined to be shielded while closing a shutter curtain. The calibration value is set based on the light receiving signal of each light receiver 81 in a state where an opening part is fully open.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a shutter device, and more particularly to a shutter device equipped with an obstacle detection means using a multi-axis sensor. [Background technology]

[0002] There is known a multi-optical axis sensor that detects an obstacle using multiple optical axes traveling in parallel. In the multi-optical axis sensor, a light-projecting unit having multiple light-emitters and a light-receiving unit having multiple light-receivers are arranged opposite to each other, and a detection area is set by multiple optical axes extending in parallel between the light-emitters and the light-receivers. The multi-optical axis sensor judges whether or not an optical axis is blocked according to the level or amount of light of a light-receiving signal received by each light-receiver from each light-emitter. Since the light-receiving sensitivity changes depending on how the level of the light-receiving signal that serves as the reference for judging whether or not the light axis is blocked is set, calibration (adjustment of light-receiving sensitivity) is required to perform appropriate detection (Patent Document 1, Patent Document 2).

[0003] There is known a shutter device that uses a multi-optical axis sensor as an obstacle detection means (Patent Document 3, Patent Document 4). By providing multiple optical axes that extend horizontally in parallel with the height direction of the opening relative to the floor surface, a planar detection area is set in a predetermined height region that includes the lower part of the opening, and when the shutter curtain descends, it detects people or objects and outputs an obstacle detection signal to stop the descent of the shutter curtain.

[0004] When a multi-optical axis sensor is provided in a shutter device, it is necessary to take note of the fact that the shutter curtain rises and falls close to the detection area. Therefore, when a multi-optical axis sensor is used as an obstacle detection means, a control (so-called blanking control) is known that eliminates cases where the optical axis is blocked by the shutter curtain itself, resulting in erroneous detection (see Patent Documents 3 and 4). Blanking control is a control that invalidates obstacle detection when the optical axes extending in parallel with a gap in the height direction are blocked in sequence in the closing direction while the shutter curtain is closed. In contrast to this, non-blanking control is also known that determines obstacle detection when at least one of the optical axes extending in parallel with a gap in the height direction is blocked while the shutter curtain is closed.

[0005] In order to properly detect an obstacle when the shutter curtain is lowered, calibration (adjustment of light receiving sensitivity) is required. In the case of non-blanking control, when the infrared rays (optical axis) of the multi-axis area sensor are emitted parallel to the shutter curtain (e.g., slats or panels), the amount of light (amount of infrared rays) of the light receiving signal of the receiver increases due to reflection at the shutter curtain. Figure 8 shows the relationship between the amount of light of the receiver of the multi-axis sensor and the position of the shutter curtain. The left figure shows a case where a shutter curtain exists opposite the optical axis, and the right figure shows a case where there is no shutter curtain opposite the optical axis. In the left figure, part of the light emitted from the projector is reflected by the shutter curtain, and this reflected light is incident on the receiver, so the amount of light of the light receiving signal of the receiver increases. In contrast, in the right figure, part of the light emitted from the projector is not reflected by the shutter curtain, so the amount of light received by the receiver decreases compared to the left figure. In the case where calibration is performed on the receiver in a state where reflected light is incident in addition to the direct light emitted from the projector, and a reference calibration value is set, if the amount of reflection decreases as the shutter curtain opens and closes (position changes), the amount of light (amount of infrared rays) in the receiver's received light signal will also decrease, and the sensor may determine that the optical axis has been blocked, resulting in a false detection. [Patent Document 1] Patent Publication No. 6-177738 [Patent Document 2] Patent Publication No. 2004-317209 [Patent Document 3] Patent Publication No. 2016-223160 [Patent Document 4] Patent Publication No. 2020-37805 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] The present invention has an object to prevent erroneous detection caused by a change in the amount of light received by a light receiver of a multi-optical axis sensor in accordance with the open / closed position of a shutter curtain. [Means for solving the problem]

[0007] The technical means adopted in the present invention are: In a shutter device equipped with an obstacle detection means using a multi-axis sensor, the obstacle detection means outputs an obstacle detection signal when it is determined that the optical axis is interrupted while the shutter curtain is closed, using the light receiving signals of the light receivers and the calibration values ​​stored in the memory; The calibration value is set based on the light receiving signal of each light receiver when the opening is fully open. A shutter device.

[0008] In one aspect, the obstacle detection means operates in a non-blanking control mode in which it outputs an obstacle detection signal when it determines that at least one of a plurality of optical axes extending parallel to each other and spaced apart in the height direction is obstructed while the shutter curtain is closed.

[0009] In one aspect, the multi-optical axis sensor is capable of selecting a first mode which is the non-blanking control mode and a second mode which is a blanking control mode, When the first mode is selected, calibration is performed based on the light receiving signals of the light receivers of the multi-axis sensor on the condition that the opening is in a fully open state; When the second mode is selected, calibration is performed based on the light reception signals of the light receivers of the multi-optical axis sensor, without the condition that the opening is in a fully open state. In one embodiment, the calibration in the second mode is performed on the condition that all optical axes are unobstructed.

[0010] In one embodiment, the calibration in the first mode is initiated by operating a calibration switch; The calibration in the second mode is started automatically. In one embodiment, the multi-axis sensor includes a power supply device, the power supply device includes a mode selection switch for selecting a first mode or a second mode; The calibration switch is provided.

[0011] Other technical means adopted in the present invention are: A method for calibrating a multi-axis sensor in a shutter device equipped with an obstacle detection means using a multi-axis sensor, comprising: the obstacle detection means outputs an obstacle detection signal when it is determined that the optical axis is interrupted while the shutter curtain is closed, using the light receiving signals of the light receivers and the calibration values ​​stored in the memory; Calibration is performed based on the light receiving signals of the light receivers of the multi-axis sensor on the condition that the opening is in a fully open state, and the calibration value is set. A calibration method.

[0012] In one aspect, the obstacle detection means operates in a non-blanking control mode in which it outputs an obstacle detection signal when it determines that at least one of a plurality of optical axes extending parallel to each other and spaced apart in the height direction is obstructed while the shutter curtain is closed. Effect of the Invention

[0013] In the present invention, by using a calibration value that is set when no reflected light of the emitted light is generated by the shutter curtain (when the opening is fully open), it is possible to prevent erroneous detection caused by changes in the amount of light received by the receiver of the multi-axis sensor depending on the opening and closing position of the shutter curtain. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a front view of the shutter device according to the embodiment. [Diagram 2] 2 is a cross-sectional view of the shutter device according to the embodiment. FIG. [Diagram 3] FIG. 2 is a vertical cross-sectional view of the shutter device according to the embodiment. [Figure 4] FIG. 2 is a diagram illustrating a power supply device for a multi-axis sensor. [Diagram 5] FIG. 1 shows a block diagram of a shutter device equipped with an obstacle detection means using a multi-axis sensor. [Figure 6] 5 is a flowchart showing a procedure for mode selection in the power supply device. [Figure 7] 10 is a flowchart showing a procedure of calibration in the first mode. [Figure 8] FIG. 13 is a diagram showing the relationship between the amount of light of the light receiver of a multi-optical axis sensor and the position of the shutter curtain. The left diagram shows a case where a shutter curtain is present opposite the optical axis, and the right diagram shows a case where there is no shutter curtain opposite the optical axis. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Fig. 1 is a front view of the shutter device according to this embodiment, Fig. 2 is a cross-sectional view of the same, and Fig. 3 is a vertical cross-sectional view of the same, and includes guide rails 1 (built into a column body 6) at both ends of the opening width direction, left and right brackets 2 located above the guide rails and extending from the body W, a winding shaft 3 provided between the brackets 2, a shutter curtain 4 whose upper end is connected to the winding shaft 3, and an opening / closing machine M that electrically drives the winding shaft 3. By rotating the winding shaft 3 in a first direction or a second direction by the opening / closing machine M, the shutter curtain 4 is wound up or unwound on the winding shaft 3, and the shutter curtain 4 rises and falls while both ends of the width direction are guided by the guide rails 1 to open and close the opening. A shutter case 5 is provided above the opening, and the winding shaft 3, the shutter curtain 4 wound around the winding shaft 3, and the opening / closing machine M are accommodated in the shutter case 5. In the illustrated embodiment, a slat shutter is shown as an example, but the shutter device is not limited to a slat shutter and may be a panel shutter, a pipe shutter (grill shutter), a sheet shutter, etc., and the type of shutter device is not limited.

[0016] As shown in Figures 1 to 3, pillar bodies 6 equipped with guide rails 1 are erected on both ends of the opening width direction. The pillar bodies 6 are equipped with a first blind wall 60, a second blind wall 61, a first blind wall 62, a second blind wall 63, and a bottom wall 64, with the guide rail 1 located between the first blind wall 62 and the second blind wall 63, and the first blind wall 60 being fixed to the framework W. Figure 2 shows the shutter core 4' extending between the grooves of the left and right guide rails 1.

[0017] As shown in Fig. 5, in the shutter device according to this embodiment, the control unit receives an "open signal" and a "close signal" from the opening / closing operation switch, and outputs an "open command" and a "close command" to the opening / closing machine M, driving the winding shaft 3 to rotate in a predetermined direction and raising and lowering the shutter curtain 4. When a "stop signal" is sent to the control unit from the opening / closing operation switch, the driving of the opening / closing machine M stops.

[0018] The shutter device according to this embodiment includes a shutter curtain position detection means. In one aspect, the shutter curtain position detection means is a position detection means using a rotary encoder or the like, and detects the position of the shutter curtain 4 according to the number of pulse counts. The upper limit position and the lower limit position of the shutter curtain can be set according to the number of pulse counts. The shutter curtain position detection means may include a mechanical upper limit switch and a mechanical lower limit switch.

[0019] When an "open signal" is sent from the opening / closing operation switch in a fully closed state of the opening, the control unit that receives the open signal outputs an "open command" to the opening / closing machine M, the opening / closing machine M rotates the winding shaft 3 in a first direction to wind up the shutter curtain 4, and when the upper limit position of the shutter curtain 4 being electrically raised is detected, a command is issued from the control unit that receives the upper limit detection signal to the opening / closing machine M, the opening / closing machine M stops rotating the winding shaft 3, and the shutter curtain 4 stops at the fully open position. In this embodiment, the shutter curtain position detection means also serves as the fully open state detection means, and a fully open signal is output when the fully open state is detected.

[0020] When the opening is fully open, a "close signal" is sent from the opening / closing operation switch, and the control unit which receives the close signal outputs a "close command" to the opening / closing machine M, causing the opening / closing machine M to rotate the winding shaft 3 in the second direction to unfold the shutter curtain 4. When the lowermost position of the shutter curtain 4 during electric descent is detected, a command is issued from the control unit which has received the lower limit detection signal to the opening / closing machine M, causing the opening / closing machine M to stop rotating the winding shaft 3, and the shutter curtain 4 to stop in the fully closed position.

[0021] The shutter device according to this embodiment is equipped with an obstacle detection means using a multi-axis sensor. When the obstacle detection means detects an obstacle during the motorized descent of the shutter curtain 4, an obstacle detection signal is sent to the control unit, and the control unit that receives the obstacle detection signal issues a command to the opening / closing device M, which stops the rotational drive of the winding shaft 3 by the opening / closing device M and stops the shutter curtain 4. The obstacle detection means according to this embodiment does not operate when the shutter curtain 4 is raised.

[0022] In this embodiment, a light projecting unit 7 of the multi-axis sensor is built into one of the cylinders 6, and a light receiving unit 8 of the multi-axis sensor is built into the other cylinder 6. The cylinder 6 with the light projecting unit 7 built in is identified as "6A," and the cylinder 6 with the light receiving unit 8 built in is identified as "6B."

[0023] 1 to 4, the light-projecting unit 7 is composed of an elongated base 70 extending in the height direction and a plurality of light-projecting devices 71 arranged at predetermined intervals (for example, 5 cm intervals) in the height direction of the base 70, and is built into recessed grooves formed in the first and second concave walls 62 and 63 of the pillar 6A. That is, in this embodiment, two rows of light-projecting units 7 are built in, positioned in the first and second concave walls 62 and 63 of the pillar 6A.

[0024] The light receiving unit 8 is composed of an elongated base 80 extending in the height direction, and a plurality of light projectors 81 arranged at predetermined intervals (for example, 5 cm intervals) in the height direction of the base 80, and is built into a concave groove formed in the first concave wall 62 and the second concave wall 63 of the pillar 6B. That is, in this embodiment, two rows of light receiving units 8 are built in, located in the first concave wall 62 and the second concave wall 63 of the pillar 6B. As shown in Fig. 2, two optical axes extend parallel to each other, located inside and outside the shutter core 4'.

[0025] The height and distance from the body W of each light projector 71 of the light projecting unit 7 and each light receiver 81 of the light receiving unit 8 are the same, and each light receiver 81 receives emitted light (typically infrared light) extending horizontally from each light projector 71. The obstacle detection means using the multi-optical axis sensor uses the light receiving signal of each light receiver 81 and each calibration value stored in the memory to output an obstacle detection signal when it is determined that the optical axis is blocked while the shutter curtain is closed.

[0026] The light-projecting unit 7 and the light-receiving unit 8 are connected to a power supply device 9 via a connection cable (not shown). A status display unit 72 is provided above the base 70 of each light-projecting unit 7, and a status display unit 82 is provided above the base 80 of each light-receiving unit 8. In this embodiment, the status display unit 72 of the light-projecting unit 7 lights up in green when the power is turned on, and is turned off when the power is not turned on. The status display unit 82 of the light-receiving unit 8 is turned off when the power is not turned on, and flashes in green for about one minute when the power is turned on. The status display unit 82 lights up in green when no obstacle is detected, and lights up in red when an obstacle is detected.

[0027] The obstacle detection means using the multi-optical axis sensor according to this embodiment can select between a first mode and a second mode. The first mode is a so-called non-blanking control mode, and is a mode in which an obstacle detection is determined when at least one of the optical axes extending in parallel with an interval in the height direction is blocked while the shutter curtain is closed. In FIG. 2, when the shutter curtain 4 is located at the same height as the optical axis when the shutter is opened or closed, the optical axis is not blocked by the shutter curtain 4 in the non-blanking control mode. The second mode is a so-called blanking control mode, and is a mode in which obstacle detection is invalidated when the optical axes extending in parallel with an interval in the height direction are blocked in order in the closing direction while the shutter curtain is closed. That is, when multiple optical axes are blocked in order from above, the obstacle detection is invalidated. In FIG. 2, when the shutter curtain 4 is located at the same height as the optical axis when the shutter is opened or closed, the optical axis is blocked by the shutter curtain 4 (typically, a light blocking element provided on the shutter curtain 4) in the blanking control mode. For the blanking control mode, see, for example, Patent Documents 3 and 4. When the first mode is selected, all optical axes are used in the non-blanking control mode, and when the second mode is selected, all optical axes are used in the blanking control mode.

[0028] As shown in FIG. 4, the power supply device 9 is provided with a mode selection switch 90. When the mode selection switch 90 is in the OFF position, the first mode is selected and a first LED lamp 91 corresponding to the first mode is turned on, and when the mode selection switch is in the ON position, the second mode is selected and a second LED lamp 92 corresponding to the second mode is turned on. The power supply device 9 is provided with a calibration switch 93. Furthermore, the power supply device 9 is provided with status indicator lamps 94A and 94B that indicate the status of the multi-axis sensor. In one embodiment, the status indicator lamps 94A and 94B behave in the same manner as the status indicator 82 of the corresponding light receiving unit 8. The number and type of indicator lamps (lamps) provided in the power supply device 9 are not limited to the embodiment shown in the figure. The power supply device 9 according to this embodiment has a built-in control unit that controls the operation of the multi-axis sensor, and a memory, and the memory stores a first mode control program, a second mode control program, and a calibration value.

[0029] As shown in FIG. 6, when the first mode is selected and the first LED lamp 91 is confirmed to be on, the calibration switch 93 is turned on, and calibration in the first mode is executed on the condition that the opening is fully open, a calibration value is set, and the first detection mode is selected. When the second mode is selected, the second LED lamp is lit, and when the second mode is selected, calibration is automatically executed on the condition that all optical axes are not blocked, a calibration value is set, and the second detection mode is selected. For example, when the optical receiver 81 cannot receive a light receiving signal for one or more optical axes, calibration is not executed. Also, when the second mode is selected, calibration may be executed on the condition that the opening is fully open, as in the first mode.

[0030] When power is applied to the power supply device 9, if the first mode is selected, the first LED lamp 91 lights up, synchronization of electrical signals begins, the display unit 72 of the receiver set 7 flashes red for a predetermined period of time (e.g., 5 seconds), the status indicator lamps 94A and 94B of the power supply device 9 flash red and orange, respectively, for a predetermined period of time (e.g., 5 seconds), and the buzzer sounds intermittently for 5 seconds.

[0031] The activation and operation of the multiple optical axis sensor when the first mode is selected will be described. When a calibration value is stored in the memory of the multiple optical axis sensor, the multiple optical axis sensor is activated using the calibration value, and the multiple optical axis sensor is activated in the first mode (non-blanking control mode) on the condition that all optical axes are passing. The calibration value is set based on the light receiving signal of each optical receiver 81 in the fully open state of the opening, and the multiple optical axis sensor is activated using the light receiving signal of each optical receiver 81 and each calibration value stored in the memory, and when at least one of the optical axes extending parallel to each other at intervals in the height direction is blocked while the shutter curtain is closed, the multiple optical axis sensor is in an obstacle detection state and outputs an obstacle detection signal.

[0032] When the multiple optical axis sensor is in a non-detection state, the status indicator 82 of the light-receiving unit 8 lights up in green, and the status indicator lamps 94A and 94B are turned off. When the multiple optical axis sensor is in a detection state, the status indicator 82 of the light-receiving unit 8 lights up in red, and the status indicator lamps 94A and 94B light up in red and orange, respectively.

[0033] If the calibration value is not stored in the memory of the multiple optical axis sensor, the display unit 72 of the receiver set 7 lights up in red, the status indicator lamps 94A and 94B of the power supply unit light up in red and orange, respectively, and the buzzer continues to sound. When the calibration switch 93 is pressed, the presence or absence of a full-open signal is determined, and if the full-open signal is "present", the buzzer stops sounding and calibration starts. The calibration value is stored in the memory, and the first detection mode is entered. Calibration (adjustment of light receiving sensitivity) in the first mode is performed only when the shutter curtain is in a fully open state (a state in which no reflection occurs due to the shutter curtain). More specifically, calibration is performed only while the full-open signal generated when the shutter curtain position detection means detects the full-open state is input to the multiple optical axis sensor (for example, the power supply unit 9). If the full-open signal is "absent", the status indicator lamps 94A and 94B of the power supply unit light up in red and orange, respectively, and the buzzer continues to sound. In this case, an "open signal" is sent from the opening / closing operation switch to raise the shutter curtain 4 to a fully open state, and calibration is started.

[0034] The multi-axis sensor has the characteristic that false detection occurs when the amount of light (amount of infrared rays) entering the receiver decreases, but false detection does not occur when the amount of light (amount of infrared rays) increases. Therefore, the optical axis calibration (automatic adjustment function for light receiving sensitivity) is performed under conditions where the amount of light receiving signal to the receiver is the minimum, and the calibration value is stored in the memory of the multi-axis sensor and used to determine whether the optical axis is blocked, so that the change in the amount of light (amount of infrared rays) associated with the opening and closing of the shutter curtain is only an increase. In other words, by performing calibration and setting the calibration value only when the shutter is fully open (when there is absolutely no reflection of the emitted light by the shutter curtain), false detection caused by the change in the amount of light receiving signal of the receiver of the multi-axis sensor associated with the opening and closing position of the shutter curtain can be prevented. In addition, since there is no need to consider the effect of reflected light by the shutter curtain, there is no need to consider the reflection of light (infrared rays) due to the shape, material, color, etc. of the shutter curtain. [Explanation of symbols]

[0035] 1 Guide rail 4. Shutter Curtain 6 pillars 7 Light projector unit 70 base 71 Floodlight 8. Receiving unit 80 base 81 Receiver

Claims

1. In a shutter device equipped with an obstacle detection means using a multi-axis sensor, the obstacle detection means outputs an obstacle detection signal when it is determined that the optical axis is interrupted while the shutter curtain is closed, using the light receiving signals of the light receivers and the calibration values ​​stored in the memory; The calibration value is set based on the light receiving signal of each light receiver when the opening is fully open. Shutter device.

2. the obstacle detection means operates in a non-blanking control mode for outputting an obstacle detection signal when it is determined that at least one of a plurality of optical axes extending in parallel at intervals in the height direction is blocked while the shutter curtain is closed; The shutter device according to claim 2 .

3. the multi-optical axis sensor is capable of selecting a first mode which is the non-blanking control mode and a second mode which is a blanking control mode, When the first mode is selected, calibration is performed based on the light receiving signals of the light receivers of the multi-optical axis sensor on the condition that the opening is in a fully open state; When the second mode is selected, calibration is performed based on the light receiving signals of the light receivers of the multi-axis sensor without the condition that the opening is in a fully open state. The shutter device according to claim 2 .

4. The calibration in the first mode is started by operating a calibration switch, The calibration in the second mode is started automatically. The shutter device according to claim 3 .

5. The multiple optical axis sensor includes a power supply device, the power supply device includes a mode selection switch for selecting a first mode or a second mode; The calibration switch is provided. The shutter device according to claim 4.

6. A method for calibrating a multi-axis sensor in a shutter device equipped with an obstacle detection means using a multi-axis sensor, comprising: the obstacle detection means outputs an obstacle detection signal when it is determined that the optical axis is interrupted while the shutter curtain is closed, using the light receiving signals of the light receivers and the calibration values ​​stored in the memory; Calibration is performed based on the light receiving signals of the light receivers of the multi-axis sensor on the condition that the opening is in a fully open state, and the calibration value is set. Calibration method.

7. the obstacle detection means operates in a non-blanking control mode for outputting an obstacle detection signal when it is determined that at least one of a plurality of optical axes extending in parallel at intervals in the height direction is blocked while the shutter curtain is closed; The calibration method according to claim 6.

Images