JP5092077B2 - Object detection device for sheet shutter - Google Patents

Description

  The present invention relates to a sheet shutter object detection device for controlling opening and closing of a sheet shutter provided in an opening of a building, and more particularly to a sheet shutter object detection device capable of preventing erroneous opening and closing due to a factor specific to the sheet shutter. .

  The sheet shutter uses a thin sheet body having flexibility to open and close the opening of the building. Because it is lighter in weight than steel shutters using metal slats, it can be opened and closed at high speeds. It is installed at the entrances and exits of factories and warehouses where trucks, forklifts, etc. frequently enter and exit. Often.

  A conventional sheet shutter includes, for example, a winding shaft that is provided above the opening and winds up the sheet body, an opening and closing device that rotationally drives the winding shaft, guide rails that are provided at both ends of the opening and guide the sheet body up and down, A limit switch that detects the amount of rotation of the opening / closing machine and stops driving of the opening / closing machine to stop the sheet body at the upper and lower limit positions of the opening, a controller that controls these, and the like are provided. Then, the sheet shutter is opened to the upper limit position in conjunction with the detection signal of the sensor that detects that a passing object has come close to the sheet shutter, and after a certain time, the sheet shutter is automatically closed to the lower limit position. It is configured.

  For example, an infrared sensor is used as a sensor for detecting a passing object. Also, in order to detect passing objects and obstacles under the seat shutter closing operation so that the closing of the seat shutter can be stopped and reopened, photoelectric lowering restriction sensors are provided at both sides of the opening. It is often added to the side.

  However, since the sheet shutter uses a thin sheet body having flexibility, a part of the sheet body may swell by being blown by wind or the like. If the sheet body swelled in this way enters the optical path of the lowering restriction sensor, it may result in a malfunction that the closing of the sheet shutter is stopped and opened again.

  Therefore, a “sheet shutter abnormality detection device” that can prevent such a malfunction is proposed (for example, see Patent Document 1).

On the other hand, in the technical field of sensors for automatic doors, an approaching passerby is detected and the automatic door is opened, and if a passerby near the automatic door is detected while the automatic door is closed, the closure is stopped and reopened. An “automatic door sensor and an automatic door opening / closing control method” that can be performed only by a single infrared sensor installed at the upper part of the opening has also been proposed (see, for example, Patent Document 2).
JP 2004-211306 A JP-A-2005-232915

  However, in the conventional technique such as Patent Document 1 described above, it is necessary to install at least two systems of sensors at the upper part of the opening and at both ends of the opening, and installation work involving wiring between the sensors of each system is complicated. . In addition, it is conceivable that the overall configuration becomes complicated and the cost increases, or the occurrence of defects due to the disconnection of the wiring is caused.

  Further, when the conventional technique such as the above-mentioned Patent Document 2 is used for the sheet shutter, a part of the sheet body swollen by wind or the like may be detected to cause a malfunction.

  In view of such a problem of the prior art, an object of the present invention is to provide a sheet shutter that can accurately control the opening and closing of the sheet shutter with a simple configuration and can prevent malfunction caused by detecting the sheet body itself as much as possible. An object detection apparatus is provided.

The object detection device for a sheet shutter according to the present invention is an object detection device for a sheet shutter that can output an object detection signal for opening / closing control of a sheet shutter using a flexible sheet body, and is in the vicinity of the sheet shutter A plurality of proximity detection areas adjacent to each other substantially parallel to the sheet shutter, and a proximity sensor for detecting an object in each of the proximity detection areas, and a side further away from the sheet shutter than the proximity detection area At least one far detection area, and when the object is detected by at least one of the far side sensor for detecting an object in the far detection area and the far side sensor, the object detection signal is output. If the object is not detected by either the far side sensor or the near side sensor, the object detection Stops outputting the signal, the case where the object only by the near-side sensor has been detected, not detected an object in the plurality of area than at constant of the neighboring detection area in Jo Tokoro determination time And a control means for outputting the object detection signal only when it is determined that the sheet shutter is not closed.
Here, the following method can be considered for determining that the sheet shutter is closed. For example, the object detection device for a seat shutter is configured so that a closing completion signal for the seat shutter can be input, and based on the closing completion signal, the control means determines whether or not the seat shutter is closed. It may be. Alternatively, it may be determined that the sheet shutter is closed when the output stop state of the object detection signal continues for a predetermined time or more.
Further, the detection capability of the proximity sensor is variable, and the control means reduces the detection capability of the proximity sensor than usual when it is determined that the seat shutter is closed, and the seat When it is determined that the shutter is not closed, the detection capability of the proximity sensor may be normal.

  According to the object detection device for a sheet shutter having such a configuration, it is further highly possible that a part of the sheet body swollen by wind or the like is detected when the sheet shutter is closed. It can be detected accurately and malfunctions are avoided as much as possible.

  Alternatively, the object detection device for a sheet shutter according to the present invention is an object detection device for a sheet shutter capable of outputting an object detection signal for opening / closing control of a sheet shutter using a flexible sheet body, In the vicinity of the shutter, a plurality of proximity detection areas are formed adjacent to and substantially parallel to the sheet shutter, and a proximity sensor that detects an object in each of the proximity detection areas is separated from the sheet shutter more than the proximity detection area. At least one far detection area is formed on the other side, and when the object is detected by at least one of the far side sensor for detecting an object in the far detection area and the far side sensor, the object detection signal is When the object is not detected by either the far side sensor or the near side sensor In the case where the output of the object detection signal is stopped and the object is detected only by the proximity sensor, within the second predetermined number or more of the plurality of proximity detection areas within the second predetermined determination time Only when the object is detected and the difference in temporal variation of the detection state between the areas where the object is detected is not within a predetermined range, or when it is determined that the seat shutter is not closed. Control means for outputting an object detection signal.

  According to the object detection device for a sheet shutter having such a configuration, when the sheet shutter is closed, it is more likely that a part of the sheet body swollen by wind or the like is detected. More accurate detection can be performed, and malfunctions are avoided as much as possible.

  According to the object detection device for a sheet shutter of the present invention, when the sheet shutter is closed, the detection ability of the proximity sensor that forms the vicinity detection area in the vicinity of the sheet shutter is lowered than usual. It is done. As a result, malfunction due to detection of a part of the sheet that is swollen by wind or the like is suppressed.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a configuration of a sheet shutter detector 1 according to the first embodiment of the present invention. As shown in the figure, the sheet shutter detector 1 is connected to a sheet shutter controller 2 that controls opening and closing of the sheet shutter.

  When the sheet shutter detector 1 detects a passing object such as a truck or a forklift, a detection signal S1 is output, and the detection signal S1 is connected to be input to the sheet shutter controller 2. The sheet shutter controller 2 starts opening the sheet shutter in response to the output of the detection signal S1. When the output of the detection signal S1 is stopped, the sheet shutter controller 2 starts closing the sheet shutter, but when the detection signal S1 is output again in the middle, the closing of the sheet shutter is stopped and the sheet shutter controller 2 is opened. Resume.

  The seat shutter controller 2 is configured to output a closing completion signal S2 indicating that the closing of the seat shutter has been completed, and the closing completion signal S2 is input to the sheet shutter detector 1. Connected so that.

  The sheet shutter detector 1 includes a first sensor 11 that forms a proximity detection area A1 in the vicinity of the sheet shutter, a second sensor 12 that forms a far detection area A2 on the side farther from the sheet shutter than the proximity detection area A1, and A third sensor 13 that forms a far detection area A3 on the side farther from the sheet shutter than the far detection area A2, and a fourth sensor 14 that forms a far detection area A4 on the farther side from the sheet shutter than the far detection area A3, And a control circuit 10 for controlling them.

  The first sensor 11 to the fourth sensor 14 are, for example, AIR type sensors that project near infrared rays and receive near infrared rays reflected from the object to detect the object, and existing ones can be used. Here, the first sensor 11 has two light receiving elements 11a and 11b, and a plurality of small detections for each system in the proximity detection area A1 by combining an optical system (not shown) including a split lens. The areas are formed so as to be alternately adjacent to each other (see FIG. 4), and an object can be detected for each system. Moreover, the detection capability of the 1st sensor 11 is comprised variably, and can be made lower than usual as needed.

  Note that the second sensor 12 to the fourth sensor 14 may be combined with an optical system including a split lens or the like, and each detection capability may be variable. Moreover, the number of sensors for the far detection area is not limited to three, but may be one or two or four or more.

  The control circuit 10 controls the operations of the first sensor 11 to the fourth sensor 14, processes signals from the first sensor 11 to the fourth sensor 14, and outputs the detection signal S1 based on the result. Decide whether to do it.

  2 (a) and 2 (b) are schematic explanatory views of the respective detection areas formed by the sheet shutter detector 1 in a closed state of the sheet shutter, FIG. 2 (a) is a side view, and FIG. ) Is a plan view. FIGS. 3A and 3B are schematic explanatory views of the detection areas in the middle of closing the sheet shutter, FIG. 3A is a side view, and FIG. 3B is a plan view. FIG. 4 is an explanatory diagram of a small detection area in the proximity detection area A1 of FIG.

  As shown in FIG. 2A, a flexible thin sheet portion 4 (sheet body) hangs down from a lower portion of a box-shaped sheet winding portion 3 installed on a wall surface or the like of the upper portion of the opening. Since a weight is wrapped around the lower end 4a of the seat portion 4, the seat portion 4 usually hangs down substantially vertically, but when a strong wind blows, for example, the central portion bends greatly (see 2 in the figure). (Indicated by a dotted line).

  The sheet shutter detector 1 is installed on the side surface of the sheet winding unit 3, and a proximity detection area A1 is formed substantially vertically downward from the installation position. In the vicinity detection area A1, as shown in FIG. 4, two small detection areas A1a and A1b are adjacently arranged so as to be alternately arranged.

  Further, a far detection area A2, a far detection area A3, and a far detection area A4 are formed in this order from the proximity detection area A1 to the side farther from the shutter.

  The sheet shutter controller 2 is incorporated in the sheet winding unit 3 and is connected to the sheet shutter detector 1 by wiring (not shown).

  FIG. 2B is a plan view seen from above, showing the positional relationship of each detection area on the ground surface 5.

  As described above, in a state where the sheet shutter is completely closed (a state where the sheet portion 4 is most extended), the sheet portion 4 bends due to the influence of strong wind or the like, and a part thereof enters the proximity detection area A1. there is a possibility. Therefore, in order to suppress the occurrence of erroneous detection due to this, the detection capability of the first sensor 11 is lowered from the normal time (the proximity detection area A1 is indicated by a broken line in the drawing to distinguish the detection capability). Furthermore, when an object is detected almost simultaneously (within a predetermined short period of time) in two adjacent small detection areas in the proximity detection area A1, there is a high possibility that the sheet portion 4 has entered. Determination is made so as not to output the detection signal S1 indicating that a passing object or the like has been detected.

  On the other hand, when the seat shutter is in the middle of closing as shown in FIGS. 3A and 3B, or when the seat shutter is completely opened, it is necessary to reliably detect traffic and obstacles below the seat portion 4. Therefore, the first sensor 11 has a normal detection capability.

  FIG. 5 is a flowchart showing a schematic operation of the sheet shutter detector 1. Processing for realizing this operation is executed by the control circuit 10. Specific examples of the control circuit 10 include, but are not limited to, a one-chip microcomputer, a PLD, and an FPGA.

  As shown in FIG. 5, first, based on the closing completion signal S2 output from the sheet shutter controller 2, it is determined whether or not the sheet shutter is in the closing completion state (step S101). If it is in the closed state, the detection capability of the first sensor 11 is lowered than normal (step S102), and if it is not in the closed state (for example, during closing), the detection capability of the first sensor 11 is returned to normal (step S103). ). If the detection capability of the first sensor 11 has already been reduced, the substantial process of step S102 can be omitted. Similarly, when the detection capability of the first sensor 11 has already returned to normal, the substantial process of step S103 can be omitted.

  Next, it is determined whether or not an object is detected based on outputs from the first sensor 11 to the fourth sensor 14. However, as described above, in order to prevent erroneous detection caused by the sheet portion 4 deflected by the influence of strong wind or the like with the sheet shutter completely closed, the output from the first sensor 11 and the second The outputs from the sensors 12 to 14 are handled separately.

  First, it is determined whether or not an object is detected in any one or more of the remote detection areas A2 to A4 based on outputs from the second sensor 12 to the fourth sensor 14 (step S104). If an object is detected, output of the detection signal S1 is started (step S105), but if it is already being output, only the output can be maintained and substantial processing can be omitted. With the start of output of the detection signal S1, the sheet shutter controller 2 starts to open the sheet shutter.

  If no object is detected in the far detection areas A2 to A4, it is further determined whether or not an object is detected in the proximity detection area A1 based on the output from the first sensor 11 (step S106). If no object is detected here, no object is detected in any of the detection areas A1 to A4. Therefore, the process proceeds to step S109 and the output of the detection signal S1 is stopped. By stopping the output of the detection signal S1, the sheet shutter controller 2 starts closing the sheet shutter.

  If an object is detected in step S106, the object is detected only in the proximity detection area A1. Therefore, it is further determined whether or not the object is detected almost simultaneously in the two small detection areas A1a and A1b (step S107), and whether or not the sheet shutter is completely closed at that time. (Step S108).

  If all the determination results are Yes, it is determined that there is a high possibility that the sheet portion 4 itself is detected, and the process proceeds to step S109. In this case, since the output of the detection signal S1 is stopped, the state is maintained as it is.

  If the determination result of either step S107 or step S108 is No, it is determined that an object such as a passing object has actually been detected, and the process proceeds to step 105, where output of the detection signal S1 is started, or already If output is in progress, this state is maintained.

Second Embodiment
In the first embodiment, it is necessary to output the closing completion signal S2 indicating that the closing of the sheet shutter is completed from the sheet shutter controller 2, and to input the output to the sheet shutter detector 1. In the second embodiment, which will be described below, since it is configured not to input the closing completion signal S2, versatility is enhanced, and even when an existing object detector or the like is installed on an existing sheet shutter, it can be replaced. Make it possible. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 6 is a block diagram showing a configuration of a sheet shutter detector 1A according to the second embodiment of the present invention. As shown in this figure, the sheet shutter detector 1A is connected to a sheet shutter controller 2A that controls opening and closing of the sheet shutter.

  Unlike the first embodiment, the sheet shutter controller 2A does not need to be configured to output the closing completion signal S2 indicating that the closing of the sheet shutter is completed, and can be easily purchased on the market. In many cases, the already installed sheet shutter controller can be used as it is.

  Since the method for determining whether or not the closing of the seat shutter has been completed is different, the processing by the control circuit 10A is partially different from the processing by the control circuit 10 of the first embodiment, but other components, etc. Is the same as in the first embodiment.

  FIG. 7 is a flowchart showing a schematic operation of the sheet shutter detector 1A. Processing for realizing this operation is executed by the control circuit 10A.

  As shown in FIG. 7, first, in order to determine whether or not the sheet shutter is in the closed state, it is confirmed whether or not the time set in the timer has already passed (step S201).

  The time setting for the timer and the start of timing are performed in step 206 described later. When an object is not detected in any of the detection areas A1 to A4 from a state in which the object is detected in any of the detection areas A1 to A4, the output of the detection signal S1 is stopped, whereby the sheet shutter controller 2A starts closing the sheet shutter. Since the time required for closing the seat shutter is normally considered to be constant, an indirect determination as to whether or not the closing of the seat shutter has been completed by measuring the elapsed time from the stop of the output of the detection signal S1 with a timer. Is possible.

  In the confirmation in step S201, if the timer set time has already elapsed, it is determined that the sheet shutter is in the closed state, and the detection capability of the first sensor 11 is reduced compared to the normal time (step S202). If the timer set time has not yet elapsed, the detection capability of the first sensor 11 is returned to normal, assuming that the sheet shutter is not in the closed state (step S203). If the detection capability of the first sensor 11 has already been reduced, the substantial process of step S202 can be omitted. Similarly, when the detection capability of the first sensor 11 has already returned to normal, the substantial process of step S203 can be omitted.

  Next, based on the outputs from the second sensor 12 to the fourth sensor 14, it is determined whether or not an object is detected in any one or more of the remote detection areas A2 to A4 (step S204). If an object is detected, output of the detection signal S1 is started (step S205), but if it is already being output, only the output is maintained and substantial processing can be omitted. With the start of output of the detection signal S1, the sheet shutter controller 2A starts to release the sheet shutter. Further, a predetermined time Ts obtained by adding a certain margin time to the time required for closing the sheet shutter is set in the timer.

  The predetermined time Ts may have an appropriate value that varies depending on the target sheet shutter. Therefore, it is desirable that the predetermined time Ts can be changed from the outside of the sheet shutter detector 1A. For example, a dip switch or the like may be provided so that an appropriate value can be set during installation work of the sheet shutter detector 1A, or wired or wireless communication between the sheet shutter detector 1A and an external device. The setting value may be changed from the external device side.

  If no object is detected in the far detection areas A2 to A4, it is further determined whether or not an object is detected in the proximity detection area A1 based on the output from the first sensor 11 (step S207). If no object is detected here, no object is detected in any of the detection areas A1 to A4. Therefore, the process proceeds to step S210 and the output of the detection signal S1 is stopped. By stopping the output of the detection signal S1, the sheet shutter controller 2A starts closing the sheet shutter.

  If an object is detected in step S207, the object is detected only in the proximity detection area A1. Therefore, it is further determined whether or not the object is detected almost simultaneously in the two small detection areas A1a and A1b (step S208), and whether or not the sheet shutter is completely closed at that time. (Step S209).

  Note that the “determination of whether or not they are detected almost simultaneously” can be determined, for example, based on whether or not the difference between the detection timings is within a minute time (first predetermined determination time). Further, when there are three or more small detection areas in the proximity detection area A1, it may be determined whether or not the first predetermined number or more of the small detection areas are detected almost simultaneously.

  In the second embodiment, since it is not possible to directly determine whether or not the sheet shutter is completely closed, in step S209, the first sensor 11 in which the determination result already performed in step S201 is reflected. Judgment is made indirectly by the detection ability. For example, the determination result in step S201 may be stored in a predetermined flag or the like and the flag may be referred to.

  If the determination result in step S208 is Yes and the detection capability of the first sensor 11 is lower than normal in the determination in S209, it is determined that there is a high possibility of detecting the sheet portion 4 itself. Then, the process proceeds to step S210. In this case, since the output of the detection signal S1 is stopped, the state is maintained as it is.

  If the determination result in step S208 is No, or if the detection capability of the first sensor 11 is normal in the determination in step S209, it is determined that an object such as a passing object is actually detected. Proceeding to 205, the output of the detection signal S1 is started, or if it is already being output, that state is maintained.

  In the control circuit 10A, the above series of processing is periodically repeated. The required time for one round is sufficiently short for the time set in the timer. While an object is detected in any of the detection areas A1 to A4, the process always goes through step S206, and the timer time setting is updated each time. Therefore, the determination in step S201 does not become Yes. However, if no object is detected in any of the detection areas A1 to A4, the process goes through step S210, so that the time setting for the timer is not updated, and the determination in step S201 eventually becomes Yes. Will change.

<Third Embodiment>
FIG. 8 is a block diagram showing a configuration of a sheet shutter detector 1B according to the third embodiment of the present invention. As shown in this figure, the third embodiment is a simplified configuration of the second embodiment, and includes a first sensor 11X having only one light receiving element for the proximity detection area and a second sensor for the far detection area. The sensor 12 and the 3rd sensor 13 and the control circuit 10B are provided. The sheet shutter controller 2A is the same as that in the second embodiment.

  As for the processing executed by the control circuit 10B, the determination is made based on the outputs from the first sensor 11X to the third sensor 13 in the processing corresponding to step S204, and the processing corresponding to steps S207 to S209 exists. Except for this point, it is the same as the control circuit 10A of the second embodiment described with reference to FIG.

  The effects of the third embodiment are relatively low compared to the first and second embodiments, but the overall configuration is simplified and the cost can be reduced. Can be an effective choice.

<Fourth embodiment>
FIG. 9 is a block diagram showing a configuration of a sheet shutter detector 1C according to the fourth embodiment of the present invention. As shown in FIG. 9, the fourth embodiment replaces the first sensor 11 for the proximity detection area of the second embodiment with a first sensor 11Y having eight independent light receiving elements 11c to 11j, The control circuit 10A is replaced with a control circuit 10C. FIG. 10 is a plan view schematically illustrating each detection area formed by the sheet shutter detector 1C. FIG. 10 corresponds to FIG. 2B and FIG. 3B, but illustrations other than the detection areas are omitted.

  As shown in FIG. 10, the first sensor 11Y combines adjacent small detection areas A11c to A11j for each system of the light receiving elements 11c to 11j in the vicinity detection area A11 by combining optical systems (not shown). Thus, the object can be detected for each system.

  Unlike the second embodiment, the detection capability of the first sensor 11Y is not variable, but may be variable. Also, the second sensor 12 to the fourth sensor 14 may be combined with an optical system including a split lens, the detection capability of each may be variable, or the configuration of the first sensor 11Y. Also good.

  The control circuit 10C controls the operations of the first sensor 11Y to the fourth sensor 14, processes the signals from the first sensor 11Y to the fourth sensor 14, and outputs the detection signal S1 based on the result. Decide whether to do it.

  FIG. 11 is a flowchart showing a schematic operation of the sheet shutter detector 1C. Processing for realizing this operation is executed by the control circuit 10C.

  As shown in FIG. 11, first, in order to determine whether or not the sheet shutter is in the closed state, it is checked whether or not the time set in the timer has already passed (step S301). The time setting to the timer and the start of timing are performed in step 306 described later, as in the second embodiment.

  In the confirmation in step S301, if the timer set time has already elapsed, the closing completion flag is set to 1 in order to store that the sheet shutter is in the closing completion state (step S302). If the timer set time has not yet elapsed, the closing completion flag is cleared to 0 in order to store that the sheet shutter is not in the closing completion state (step S303).

  Next, based on the outputs from the second sensor 12 to the fourth sensor 14, it is determined whether or not an object is detected in any one or more of the remote detection areas A2 to A4 (step S304). If an object is detected, output of the detection signal S1 is started (step S305), but if it is already being output, only the output is maintained and substantial processing can be omitted. With the start of output of the detection signal S1, the sheet shutter controller 2A starts to release the sheet shutter. Further, a predetermined time Ts obtained by adding a certain margin time to the time required for closing the sheet shutter is set in the timer.

  If no object is detected in the far detection areas A2 to A4, it is further determined whether or not an object is detected in the proximity detection area A11 based on the output from the first sensor 11Y (step S307). If no object is detected here, no object is detected in any of the detection areas A11, A2 to A4, so the process proceeds to step S311 and the output of the detection signal S1 is stopped. By stopping the output of the detection signal S1, the sheet shutter controller 2A starts closing the sheet shutter.

  If an object is detected in step S307, the object is detected only in the proximity detection area A11. Therefore, it is further determined whether or not the object is detected almost simultaneously in four or more of the eight small detection areas A11c to A11j (step S308), and the time of the output signal from the system that detected the object A determination is made as to whether or not the fluctuations are substantially the same (step S309), and a closing completion flag indicating the closing completion state of the seat shutter is confirmed (step S310).

  Note that “4” in “four or more of eight systems” is merely an example (second predetermined number). The “determination of whether or not they are detected almost at the same time” can be determined, for example, based on whether or not the difference between the detection timings is within a minute time (second predetermined determination time).

  “Determining whether or not the temporal fluctuation of the output signal from the system that detected the object has the same tendency” means, for example, that when the object is detected almost simultaneously in four systems, the output signal from each system The temporal variation was almost the same as the waveforms W11 to W14 shown in FIGS. 12 (a) to 12 (d), or the waveforms shown in FIGS. 13 (a) to 13 (d). It is to determine whether at least one has a tendency different from the others as in W21 to W24. In addition, the broken line in a figure has shown the threshold value which determines with having detected the object within the corresponding area.

  This determination is based on the assumption that the output signals of all systems show almost the same fluctuation in time in the situation where the seat part 4 itself is detected, and that the output signals of some systems are in other systems. If the output signal is different in time from the output signal, it is based on the high possibility that an object different from the seat portion 4 is detected.

  As a specific determination method, there is a method in which one system is selected from systems in which objects are detected almost simultaneously and is used as a reference, and determination is performed based on temporal variations in absolute values of differences from output signals of other systems. . For example, in the case of FIG. 12A to FIG. 12D, when W11 is used as a reference, the absolute values of W12-W11, W13-W11, and W14-W11 are values that are always close to 0 with almost no temporal variation. It is thought to maintain. On the other hand, with reference to W21 in the cases of FIGS. 13 (a) to 13 (d), the absolute values of W23-W21 and W24-W21 do not fluctuate in time and are always close to 0. Since only the absolute value of W22-W21 fluctuates greatly, it becomes possible to distinguish from the cases shown in FIGS. 12 (a) to 12 (d).

  If the determination results in steps S308 and S309 are both Yes and the closing completion flag is 1 in the confirmation in S310, it is determined that there is a high possibility that the seat portion 4 itself has been detected, and step S311 is performed. Proceed to In this case, since the output of the detection signal S1 is stopped, the state is maintained as it is.

  If the determination result in either step S308 or S309 is No, or if the closing completion flag is 0 in the confirmation in step S310, it is determined that an object such as a passing object is actually detected. Proceeding to step 305, output of the detection signal S1 is started, or if it is already being output, that state is maintained.

  In the control circuit 10C, the above series of processing is periodically repeated. The required time for one round is sufficiently short for the time set in the timer. As long as the object is detected in any of the detection areas A11, A2 to A4, the process always goes through step S306, so the timer time setting is updated each time, so the determination in step S301 is Yes. Absent. However, if no object is detected in any of the detection areas A11 and A2 to A4, the process goes through step S311, so that the time setting for the timer is not updated, and the determination in step S301 is eventually made. It will change to Yes.

  In the fourth embodiment, the proximity detection area A11 has a large number of independent small detection areas, and the sheet portion 4 itself is detected based on the detection timing in each detection result and the temporal variation of the output signal. Therefore, the accuracy of the determination is improved. Furthermore, since the detection capability of the proximity detection area A11 remains normal even when the seat shutter is closed, the object that should be detected can be reliably detected, so that the operation reliability can be improved.

<Other variations>
The methods used in the above embodiments can be appropriately combined or partially replaced. For example, in the second embodiment to the fourth embodiment, if the sheet shutter controller 2 is used instead, it is possible to change the process to directly determine whether or not the sheet shutter is in the closed state. become. In addition, the number of far detection areas may be changed, or a plurality of small detection areas may be formed adjacent to each other so as to be able to detect an object for each system.

  It should be noted that the present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-mentioned embodiment is only a mere illustration in all points, and should not be interpreted limitedly. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

It is a block diagram which shows the structure of the detector 1 for sheet shutters which concerns on 1st Embodiment of this invention. FIGS. 2A and 2B are schematic explanatory views of the detection areas formed by the sheet shutter detector 1 in a closed state of the sheet shutter, in which FIG. 2A is a side view and FIG. 2B is a plan view. 3A and 3B are schematic explanatory views in the middle of closing the sheet shutter in each detection area in FIG. 2, in which FIG. 3A is a side view and FIG. 3B is a plan view. It is explanatory drawing about the small detection area in proximity | contact detection area A1 of FIG.3 (b). 3 is a flowchart showing a schematic operation of the sheet shutter detector 1; It is a block diagram which shows the structure of the detector 1A for sheet shutters concerning 2nd Embodiment of this invention. It is a flowchart which shows schematic operation | movement of the detector 1A for sheet shutters. It is a block diagram which shows the structure of the detector 1B for sheet shutters concerning 3rd Embodiment of this invention. It is a block diagram which shows the structure of 1 C of sheet shutter detectors concerning 4th Embodiment of this invention. It is a top view for the schematic explanation of each detection area formed by detector 1C for sheet shutters. It is a flowchart which shows schematic operation | movement of the detector 1C for sheet shutters. It is an example of the time fluctuation | variation of 4 types of output signals among the 1st sensors 11Y of the detector 1C for sheet shutters. It is another example of the time-dependent fluctuation | variation of an output signal of 4 systems among the 1st sensors 11Y of the detector 1C for sheet shutters.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet shutter detector 1A Sheet shutter detector 1B Sheet shutter detector 1C Sheet shutter detector 2 Sheet shutter controller 2A Sheet shutter controller 3 Sheet winding unit 4 Sheet unit 5 Ground 10 Control circuit (control means) )
10A Control circuit (control means)
10B Control circuit (control means)
10C control circuit (control means)
11 First sensor (Near side sensor)
11X 1st sensor (Near side sensor)
11Y 1st sensor (Near side sensor)
12 Second sensor (far side sensor)
13 Third sensor (far side sensor)
14 4th sensor (far side sensor)

Claims (5)

A sheet shutter object detection device capable of outputting an object detection signal for opening / closing control of a sheet shutter using a flexible sheet body,
In the vicinity of the sheet shutter, a plurality of proximity detection areas are formed adjacent to and substantially parallel to the sheet shutter, and proximity sensors that respectively detect objects in these proximity detection areas;
A far side sensor that forms at least one far detection area on a side farther from the sheet shutter than the near detection area, and detects an object in the far detection area;
The object detection signal is output when an object is detected by at least one of the far side sensors, and the object detection signal is output when no object is detected by either the far side sensor or the near side sensor. the stops and the case where the object only by the near-side sensor has been detected, when an object at a constant or within an area where one of said plurality of neighboring detection areas within Jo Tokoro determination time is not detected or And a control unit that outputs the object detection signal only when it is determined that the sheet shutter is not closed. A sheet shutter object detection device capable of outputting an object detection signal for opening / closing control of a sheet shutter using a flexible sheet body,
In the vicinity of the sheet shutter, a plurality of proximity detection areas are formed adjacent to and substantially parallel to the sheet shutter, and proximity sensors that respectively detect objects in these proximity detection areas;
A far side sensor that forms at least one far detection area on a side farther from the sheet shutter than the near detection area, and detects an object in the far detection area;
The object detection signal is output when an object is detected by at least one of the far side sensors, and the object detection signal is output when no object is detected by either the far side sensor or the near side sensor. the stops and the case where the object only by the near-side sensor has been detected, the object with the object in the above constant area where one of Jo Tokoro determination time said plurality of neighboring detection area within is detected Control means for outputting the object detection signal only when the difference in the temporal variation of the detection state between the areas where the detection is detected is not within a predetermined range, or when it is determined that the seat shutter is not closed; An object detection device for a sheet shutter, comprising: In the object detection apparatus for sheet shutters according to claim 1 or 2 ,
The seat shutter closing completion signal is configured to be input,
The control means determines whether or not the sheet shutter is closed based on the closing completion signal. In the object detection apparatus for sheet shutters according to claim 1 or 2 ,
The control means determines that the sheet shutter is closed when the output stop state of the object detection signal continues for a predetermined time or more. In the object detection apparatus for sheet shutters according to any one of claims 1 to 4 ,
The detection capability of the proximity sensor is variable,
The control means lowers the detection capability of the proximity sensor when it is determined that the seat shutter is closed, and the proximity sensor when it is determined that the seat shutter is not closed. An object detection device for a sheet shutter, characterized by having a normal detection capability .

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