Shutter device

Abstract

To provide a shutter device capable of setting appropriate upper and lower limit positions even when reset is performed after power outage occurs.SOLUTION: A shutter device for performing an opening / closing operation of a shutter curtain between an upper limit position and a lower limit position, includes a motor for driving the shutter curtain to be opened / closed, and a shutter control device for controlling the motor to perform the opening / closing operation and for executing overload detection to detect an overload state of the motor during the opening / closing operation. The shutter control device holds positional information of the shutter curtain 4 before the power outage occurs in the shutter curtain, and a threshold value when detecting the overload on the shutter curtain, even in the power outage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a shutter device. [Background technology]

[0002] There is a shutter device that opens and closes a shutter curtain between an upper limit position (fully open position) and a lower limit position (fully closed position) (for example, Patent Document 1). However, when the device is restored after a power outage, the control information is erased, which may result in an abnormal stop. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-89329 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure has been made in consideration of these circumstances, and its purpose is to provide a shutter device that can set appropriate upper and lower limit positions even when power is restored after a power outage has occurred. [Means for solving the problem]

[0005] One aspect of the present disclosure is a shutter device that opens and closes a shutter curtain between an upper limit position and a lower limit position, the shutter device comprising: a motor that drives the shutter curtain to open and close; and a shutter control device that controls the motor to perform the opening and closing operation and performs overload detection to detect an overload condition of the motor during the opening and closing operation, the shutter control device retaining control information for the shutter curtain 4 even during a power outage. [Brief description of the drawings]

[0006] [Figure 1]FIG. 1 is a diagram illustrating an example of a schematic configuration of a shutter system according to an embodiment of the present invention. [Diagram 2] 1 is a schematic configuration diagram of a shutter control device according to an embodiment of the present invention. [Diagram 3] 2 is a functional block diagram of a control unit of the shutter control device according to the embodiment. FIG. [Figure 4] 10 is a flowchart showing an operation of a control unit 13 in the second embodiment. [Diagram 5] 13 is a flowchart showing an operation of a processing unit 16 in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, the shutter device according to this embodiment will be described with reference to the drawings.

[0008] The shutter system 1 shown in FIG.

[0009] The shutter device 2 is an electric shutter device that opens or closes openings such as windows and doors of a building. The shutter device 2 is equipped with a shutter curtain 4, and can open or close the above-mentioned openings by opening or closing the shutter curtain 4 based on an operation signal from an operation device 3.

[0010] The operation device 3 is connected to the shutter device 2, which is the object of operation, via a wired or wireless connection, and is capable of mutual communication with the shutter device 2. The operation device 3 is operable by a user or an operator, and is equipped with a means for inputting an operation signal to the shutter device 2, such as a remote control device.

[0011] Specifically, when a user presses any of the switches on the operation device 3, the operation device 3 outputs to the shutter device 2 an operation signal that is a signal corresponding to the switch.

[0012] For example, when the open switch SWo is operated, the operation device 3 transmits a first operation signal to the shutter device 2 instructing the opening operation of the shutter curtain 4. When the close switch SWc is operated, the operation device 3 transmits a second operation signal to the shutter device 2 instructing the closing operation of the shutter curtain 4. When the stop switch SWt is operated, the operation device 3 transmits a stop signal to the shutter device 2 instructing the stopping of the opening operation or closing operation of the shutter curtain 4.

[0013] When a predetermined operation is performed by the user, the operation device 3 transmits a setting signal to the shutter device 2. For example, the predetermined operation is an operation different from a short press of one of the open switch SWo, the close switch SWc, and the stop switch SWt. Specifically, the predetermined operation is a simultaneous press of two or more switches of the open switch SWo, the close switch SWc, and the stop switch SWt, or a long press of one or more switches.

[0014] The above-mentioned predetermined operation is not limited to pressing two or more of the open switch SWo, close switch SWc, and stop switch SWt simultaneously, or pressing and holding one or more of the switches. For example, the operation device 3 may be provided with an initial setting button. The above-mentioned predetermined operation may be pressing the initial setting button. For example, the initial setting button may be provided on the front or rear of the operation device 3. When the initial setting button is provided on the rear of the operation device 3, for example, the initial setting button is covered by a rear cover and becomes operable by removing the rear cover. The initial setting button is provided in a position that is exposed when the rear cover is removed.

[0015] The initial setting button may be provided in a battery box that houses a battery. In this case, the initial setting button can be operated by a user by removing a battery cover that is configured to be attachable to the main body case of the operating device 3 so as to cover the battery box from the rear side of the operating device 3. The initial setting button is provided in a position that is exposed when the battery cover is removed.

[0016] The operation device 3 may be a mobile information terminal such as a smartphone or a tablet terminal. In this case, the predetermined operation may be a command operation for initial setting in an application (for example, a smartphone application) of the mobile information terminal.

[0017] Next, an example of a schematic configuration of the shutter device 2 according to this embodiment will be described.

[0018] As shown in FIG. 1, the shutter device 2 includes a shutter curtain 4, guide rails 5a and 5b, and a shutter box 6.

[0019] The shutter curtain 4 has a plurality of long slats 4a connected in the vertical direction and a baseboard portion 4b provided at the bottom end.

[0020] The baseboard portion 4b is a long member having a rectangular cross section connected to the lowest slat 4a. The baseboard portion 4b is formed to protrude so as to come into contact with the slat (not shown) or the shutter box 6 when the shutter curtain 4 is in a fully open state (upper limit position Pu). The baseboard portion 4b comes into contact with the slat (not shown) or the shutter box 6 when the shutter curtain 4 is in a fully open state. The baseboard portion 4b is formed to protrude so as to come into contact with a receiving portion (not shown) provided on the shutter box 6 or the shutter device 2. The baseboard portion 4b comes into contact with the lower frame of the frame body of the shutter device 2 or the floor surface when the shutter curtain 4 is in a fully closed state (lower limit position Pl).

[0021] The gusset is a partition member for the opening of the shutter device 2 formed when the shutter curtain 4 rises, and may be provided at the bottom of the shutter box 6.

[0022] The guide rails 5a and 5b are provided as a pair at both ends in the width direction of the shutter curtain 4 and stand perpendicular to the bottom surface. The guide rails 5a and 5b regulate the lateral displacement of each of the slats 4a constituting the shutter curtain 4.

[0023] The shutter box 6 is provided on the upper part of the shutter device 2. This shutter box 6 rewinds the shutter curtain 4 (when the shutter curtain 4 is closed) or winds it up (when the shutter curtain 4 is opened).

[0024] An example of a schematic configuration of the shutter box 6 according to this embodiment will be described below. As shown in Fig. 1, the shutter box 6 includes a shaft 7, a motor 8, an output unit 9, and a shutter control device 10. The motor 8, output unit 9, and shutter control device 10 of the shutter box 6 are driven by electricity supplied from the outside. The shutter box 6 detects a state in which a power outage occurs and electricity is not supplied from the outside. Electricity to the motor 8, output unit 9, and shutter control device 10 may be supplied from a household power source, a battery, or a generator (solar panel generator).

[0025] The shaft 7 is connected to the upper end of the shutter curtain 4 and to a motor 8. The shaft 7 is driven to rotate in forward and reverse directions by the motor 8. The shutter curtain 4 is unwound or wound in response to the rotation of the shaft 7. The shutter curtain 4 wound around the shaft 7 is accommodated in the shutter box 6.

[0026] The motor 8 is a drive source that rotates the shaft 7 to open and close the shutter curtain 4, and is composed of, for example, a DC motor. The motor 8 rotates forward, reverse, or stops rotating based on a drive signal from the shutter control device 10.

[0027] The output unit 9 has a function of outputting the driving status of the motor 8. The output unit 9 is, for example, an encoder built into the motor 8. The output unit 9 outputs a pulse signal (hereinafter referred to as a "position pulse") corresponding to the rotation of the motor 8 to the shutter control device 10. For example, the output unit 9 outputs one position pulse to the shutter control device 10 every time the motor 8 rotates once. The output unit 9 is not limited to an encoder, and can be arbitrarily selected as long as it has a configuration that can grasp the amount of rotation of the winding shaft and the motor 8, such as measuring the amount of rotation angle of the motor 8.

[0028] As shown in FIG. 2, the shutter control device 10 includes a communication unit 11, a drive unit 12, and a control unit 13.

[0029] The communication unit 11 transmits and receives information by communicating with the operation device 3. The communication method of the communication unit 11 is not particularly limited, but in this embodiment, a wireless communication method such as the short-range wireless communication standard RF4CE (Radio Frequency for Consumer Electronics) or Bluetooth (registered trademark) is used.

[0030] The drive unit 12 generates a drive signal in response to a command from the control unit 13 and outputs the drive signal to the motor 8 to drive or stop the motor 8 .

[0031] The control unit 13 is composed of a microprocessor such as a CPU or an MPU, a microcontroller such as an MCU, a storage device, and the like, and controls the driving of the motor 8 in response to the operation of the switch of the operation device 3.

[0032] The control unit 13 controls the rotation of the motor 8 based on an operation signal from the operating device 3 to open or close the shutter curtain 4 (hereinafter simply referred to as "opening / closing operation") between an upper limit position Pu and a lower limit position Pl. The upper limit position Pu is the position where the shutter curtain 4 is fully open (fully open position). The lower limit position Pl is the position where the shutter curtain 4 is fully closed (fully closed position).

[0033] When the control unit 13 receives a first operation signal from the operating device 3 via the communication unit 11, it outputs a command to the drive unit 12 to wind the shutter curtain 4 around the shaft 7 and perform an opening operation (hereinafter referred to as an "open command"). As a result, the drive unit 12 rotates the motor 8 in the forward direction to perform an opening operation of the shutter curtain 4.

[0034] When the control unit 13 receives a second operation signal from the operating device 3 via the communication unit 11, it outputs a command to the drive unit 12 to unwind the shutter curtain 4 from the shaft 7 and perform a closing operation (hereinafter referred to as a "closing command"). This causes the drive unit 12 to rotate the motor 8 in the reverse direction and perform a closing operation of the shutter curtain 4.

[0035] When the control unit 13 receives a stop signal from the operating device 3, it outputs a command to stop the operation of the shutter curtain 4 (hereinafter referred to as a "stop command") to the driving unit 12. As a result, the driving unit 12 stops the rotation of the motor 8 to stop the opening and closing operation.

[0036] The control unit 13 controls the motor 8 to perform opening and closing operations, and also executes overload detection to detect an overload state of the motor 8. Details of the command output by the control unit 13 to the drive unit 12 when the control unit 13 detects an overload will be described later.

[0037] When the control unit 13 receives a setting signal from the operating device 3, the control unit 13 transitions to a setting mode in which it sets an upper limit position Pu and a lower limit position Pl. In the setting mode, the control unit 13 controls the motor 8 to perform opening and closing operations and also executes overload detection to detect an overload state of the motor 8. In the setting mode, when an overload state of the motor 8 is detected during an opening operation of the shutter curtain 4, the control unit 13 sets the upper limit position Pu based on the current position of the shutter curtain 4, and when an overload state of the motor 8 is detected during a closing operation of the shutter curtain 4, the control unit 13 sets the lower limit position Pl based on the current position of the shutter curtain 4.

[0038] Hereinafter, the functional units of the control unit 13 for executing the process of the setting mode according to this embodiment will be described with reference to Fig. 3. Fig. 3 is a functional block diagram of the control unit 13 for executing the return process of the shutter control device 10.

[0039] Hereinafter, functional units of the control unit 13 according to an embodiment of the present disclosure will be described.

[0040] The control unit 13 includes a drive control unit 14 , a load detection unit 15 , a processing unit 16 , and a storage unit 17 .

[0041] When a predetermined operation is performed on the operating device 3, the drive control unit 14 outputs an open command to the drive unit 12 to start the opening operation of the shutter curtain 4. When an overload state of the motor 8 is detected by overload detection during the opening operation, the drive control unit 14 outputs a stop command to stop the opening operation. When an overload state of the motor 8 is detected by overload detection during the closing operation, the drive control unit 14 outputs a stop command to stop the closing operation, and outputs an open command to the drive unit 12 to start the opening operation of the shutter curtain 4.

[0042] The drive control unit 14 changes the speed of the opening and closing operation depending on the position of the shutter curtain 4. When the shutter curtain 4 is between a position that is a predetermined number of pulses below the upper limit position Pu and the upper limit position Pu, the drive control unit 14 causes the shutter curtain 4 to perform an opening operation at a slower speed than when the shutter curtain 4 is in other positions. When the shutter curtain 4 is between a position that is a predetermined number of pulses above the lower limit position Pl and the lower limit position Pl, the drive control unit 14 causes the shutter curtain 4 to perform a closing operation at a slower speed than when the shutter curtain 4 is in other positions.

[0043] The load detection unit 15 detects the load (hereinafter referred to as the “motor load”) applied to the motor 8. The load detection unit 15 includes a counter 151 and a load measurement unit 152.

[0044] The counter 151 counts the number of position pulses. The count value n of the number of pulses corresponds to the current position of the shutter curtain 4.

[0045] The load measuring unit 152 measures the motor load based on the position pulse output from the output unit 9. Specifically, for example, the load measuring unit 152 measures the pulse width An of the position pulse output from the output unit 9 as the motor load for each position pulse (for each count value n of the counter 151). For example, the pulse width An is the pulse width of the position pulse when the motor 8 makes one rotation.

[0046] The pulse width of the position pulse increases as the rotation speed of the motor 8 decreases, and decreases as the rotation speed of the motor 8 increases. That is, when the shutter curtain 4 reaches the upper limit position Pu and the baseboard 4b comes into contact with the bamboo grass or the shutter box 6, a load is applied to the motor 8, and the motor 8 becomes overloaded. Therefore, the rotation speed of the motor 8 decreases, and the pulse width of the position pulse increases.

[0047] When the shutter curtain 4 reaches the lower limit position Pl and the baseboard portion 4b abuts against the floor or the sill, if the closing operation continues, the baseboard portion 4b presses against the floor or the sill. As a result, a load is applied to the motor 8, and the motor 8 becomes overloaded. Therefore, the rotation speed of the motor 8 slows down, and the pulse width of the position pulse becomes larger.

[0048] When the shutter curtain 4 reaches the lower limit position Pl and the baseboard 4b abuts against the floor or the sill, the slats will bend from below if the closing operation continues. As a result, a load is applied to the motor 8, causing the motor 8 to be overloaded. This causes the rotation speed of the motor 8 to slow down, and the pulse width of the position pulse to increase.

[0049] The load measurement unit 152 measures the pulse width of the position pulse for each position pulse (for each count value n) to calculate the pulse width An of the motor 8 as the motor load. The load measurement unit 152 associates the count value n with the motor load and outputs them to the processing unit 16. The load measurement unit 152 outputs the count value n and the pulse width (motor load) An of the position pulse corresponding to that count value n to the processing unit 16. The load measurement unit 152 associates position information n with the pulse width An of the position pulse corresponding to that position information n and stores it in the storage unit 17 as load information.

[0050] The processing unit 16 sets the upper limit position Pu and the lower limit position Pl by detecting an overload. Specifically, the processing unit 16 includes a setting time processing unit 161 and an operation time processing unit 162.

[0051] The setting time processing unit 161 executes overload detection during the opening and closing operation of the shutter curtain 4 in the setting mode (hereinafter, "setting time overload detection"). When the setting time processing unit 161 detects an overload state of the motor 8 by the setting time overload detection during the opening operation, it sets the upper limit position Pu based on the current position of the shutter curtain 4. For example, the setting time processing unit 161 may set the count value n when the overload state of the motor 8 is detected by the overload detection during the opening operation to the upper limit position Pu. For example, the setting time processing unit 161 may reset the count value n when the overload state of the motor 8 is detected by the setting time overload detection during the opening operation to "0", and set the count value n reset to "0" to the upper limit position Pu.

[0052] The setting time overload detection is a process of determining whether or not the motor 8 is in an overload state based on the motor load output from the load detection unit 15. For example, the setting time processing unit 161 determines that the motor 8 is in an overload state when the motor load or the rate of change of the motor load exceeds a predetermined threshold value th1.

[0053] In the setting overload detection during the opening operation, the setting processing unit 161 detects the overload state of the motor 8 not at the position (upper limit position Pu) where the baseboard portion 4b abuts against the rug or the shutter box 6, but at the position (hereinafter referred to as the "tightening position") where the shutter curtain 4 is opened from the upper limit position Pu and tightened. The deviation ΔH1 between the tightening position and the upper limit position Pu is represented by the count number n1 of the position pulses between the tightening position and the upper limit position Pu, and can be obtained in advance based on experiments, the size of the shutter curtain 4, etc. The setting processing unit 161 may obtain the upper limit position Pu from the tightening position using the known deviation ΔH1. For example, the setting processing unit 161 may set the upper limit position Pu by subtracting or adding the count number n1 from the count value n when the overload state of the motor 8 is detected by the setting overload detection during opening and closing.

[0054] The setting time processing unit 161 executes setting time overload detection during the closing operation of the shutter curtain 4 in the setting mode. When the setting time processing unit 161 detects an overload state of the motor 8 by the setting time overload detection during the closing operation, it sets the lower limit position Pl based on the current position of the shutter curtain 4.

[0055] For example, the setting time processing section 161 may set the count value n to the lower limit position Pl when an overload state of the motor 8 is detected by the setting time overload detection during the closing operation.

[0056] The setting overload detection during the opening operation and the setting overload detection during the closing operation may be performed by the same method, or may be performed by different methods.

[0057] In the setting overload detection during the closing operation, the setting processing unit 161 detects the overload state of the motor 8 not at the position (lower limit position Pl) where the baseboard portion 4b abuts against the floor surface or the lower frame, but at the position (hereinafter referred to as the "push-in position") where the shutter curtain 4 is further closed from the lower limit position Pl and the shutter curtain 4 pushes in the floor surface or the lower frame. That is, the shutter curtain 4 in the push-in position is deflected from below, and a deviation ΔH2 occurs between the push-in position, which is the position where the overload state of the motor 8 is detected in the setting overload detection during the closing operation, and the lower limit position where there is no deflection. The deviation ΔH2 between the push-in position and the lower limit position Pl is represented by the count number n2 of the position pulse between the push-in position and the lower limit position Pl, and can be obtained in advance by experiments, the size of the shutter curtain 4, etc. The setting processing unit 161 can obtain the lower limit position Pl from the push-in position using the known count number n2. For example, the setting time processing unit 161 may set the lower limit position Pl to a value obtained by subtracting a count number n2 (ΔH2) from the count value n when an overload state of the motor 8 is detected by overload detection at setting time during the closing operation. If the deviation ΔH2 is tolerable, the setting time processing unit 161 may set the lower limit position Pl to the count value n when an overload state of the motor 8 is detected by overload detection at setting time during the closing operation. The count number n2 is referred to as the "first distance."

[0058] The setting time processing unit 161 may set the lower limit position Pl to a position that is a first distance away in the opening direction from the current position of the shutter curtain 4 when an overload state of the motor 8 is detected by the setting time overload detection during the closing operation. The opening direction is the direction in which the shutter curtain 4 moves when the shutter curtain 4 is opened, and in this embodiment, is the direction in which the shutter box 6 is arranged.

[0059] For example, when a predetermined operation is performed on the operating device 3, the drive control unit 14 outputs an open command to the drive unit 12 to start the opening operation of the shutter curtain 4. When an overload state of the motor 8 is detected by overload detection during the opening operation, the drive control unit 14 outputs a stop command to stop the opening operation. At this time, the current position of the shutter curtain 4 is the tightening position. The drive control unit 14 lowers the shutter curtain 4 at the tightening position by the count number n1 and stops it. The setting time processing unit 161 may reset the current position of the shutter curtain 4 that has been closed by the count number n1, that is, the current count value n, to "0", and set the count value n reset to "0" as the upper limit position Pu. The drive control unit 14 automatically executes the closing operation when the upper limit position Pu is set.

[0060] If the deviation ΔH1 is tolerable, the shutter curtain 4 at the tightening position may be set as the upper limit position Pu without lowering the shutter curtain 4 at the tightening position by the count number n1.

[0061] The operation time processing unit 162 executes overload detection during the opening and closing operation of the shutter curtain 4 in the operation mode (hereinafter, "overload detection during opening and closing"). The opening and closing operation of the shutter curtain 4 in the operation mode refers to the opening and closing operation of the shutter curtain 4 when the drive control unit 14 outputs an open command or a close command to the drive unit 12. The method of overload detection may be the same as the setting time overload detection described above. First, the processing during the closing operation will be described.

[0062] The operation time processing unit 162 executes overload detection during opening / closing during the closing operation of the shutter curtain 4 in the operation mode. When the setting time processing unit 161 detects an overload state of the motor 8 by overload detection during opening / closing during the closing operation, it causes the drive unit 12 to perform a reverse operation. When the setting time processing unit 161 detects an overload state of the motor 8 by overload detection during setting during the closing operation, the drive control unit 14 outputs an open command to the drive unit 12 to start the opening operation of the shutter curtain 4, and returns the position of the shutter curtain 4 to the upper limit position Pu.

[0063] Next, the process during the opening operation will be described. The operation time processing unit 162 executes overload detection during opening / closing during the opening operation of the shutter curtain 4 in the operation mode. Then, when the setting time processing unit 161 detects an overload state of the motor 8 by overload detection during opening / closing during the opening operation, it causes the drive unit 12 to perform a reverse operation. When the setting time processing unit 161 detects an overload state of the motor 8 by overload detection during setting during the opening operation, the drive control unit 14 outputs a close command to the drive unit 12 to start the closing operation of the shutter curtain 4, and returns the position of the shutter curtain 4 to the lower limit position Pl.

[0064] The shutter device 2 may take any of the forms of the first to third embodiments. The first to third embodiments may be arbitrarily combined.

[0065] In the first embodiment, the storage unit 17 stores control information of the shutter curtain 4. The control information of the shutter curtain 4 includes, for example, a threshold value when the shutter curtain 4 detects an overload. The threshold value may be set to an appropriate value depending on the size of the shutter curtain 4, etc. The size of the threshold value may be changeable by operating the operation device 3, etc. The control information of the shutter curtain 4 includes, for example, the position from the upper limit position or the lower limit position of the shutter curtain 4. The storage unit 17 retains the control information of the shutter curtain 4 even when the shutter device 2 experiences a power outage.

[0066] The shutter device 2 can easily recover from a power outage by retaining the control information of the shutter curtain 4 even during a power outage. For example, by the storage unit 17 retaining the threshold value when the shutter curtain 4 detects an overload, if the shutter curtain 4 is operated from the position where it stopped during the power outage after the power is restored, the overload can be detected normally. For example, by the storage unit 17 retaining the position of the shutter curtain 4, if the shutter curtain 4 is operated from the position where it stopped during the power outage after the power is restored, the shutter device 2 can recover normally.

[0067] In the second embodiment, when the control unit 13 receives a signal from the operating device 3 via the communication unit 11 after recovery from a power outage, the control unit 13 first causes the shutter curtain 4 to perform an opening operation regardless of the instruction of the signal. After causing the shutter curtain 4 to perform an opening operation, the control unit 13 causes the shutter curtain 4 to perform an operation indicated by the signal (for example, a closing operation). For example, the control unit 13 causes the shutter curtain 4 to perform an opening operation, and then causes the shutter curtain 4 to perform an opening / closing operation in the setting mode, and updates the upper limit position and the lower limit position.

[0068] 4 is a flowchart showing the operation of the control unit 13 in the second embodiment. The control unit 13 receives a signal from the operating device 3 (step S21). If it is after recovery from a power outage (step S22: YES), the control unit 13 causes the shutter curtain 4 to perform an opening operation (step S23). After step S23 and if it is not after recovery from a power outage (step S22: NO), the control unit 13 causes the shutter curtain 4 to perform the operation indicated by the received signal.

[0069] When the control unit 13 causes the shutter curtain 4 to perform an opening operation after a power outage, the control unit 13 may recognize the position where the shutter has stopped as the fully open position. The shutter may stop due to an overload detection, a current detection, or a motor stop. After recognizing the fully open position of the shutter curtain 4, the control unit 13 may cause the shutter curtain 4 to perform an opening / closing operation and a return operation.

[0070] In the third embodiment, the processing unit 16 determines that an overload state exists when the speed of the shutter curtain 4 is slower than the normal speed by a predetermined amount. The speed of the shutter curtain 4 is calculated by measuring the position pulse by the load detection unit 15. The normal speed of the shutter curtain 4 may be slow depending on the position of the shutter curtain 4 and whether the shutter curtain 4 is opening or closing, but the processing unit 16 compares the normal speed with the speed of the shutter curtain 4 for each case of the position of the shutter curtain 4 and whether the shutter curtain 4 is opening or closing, and determines whether an overload state exists.

[0071] 5 is a flowchart showing the operation of the processing unit 16 in the third embodiment. The processing unit 16 acquires the speed of the shutter curtain 4 (step S31). If the speed of the shutter curtain 4 is slower than the normal speed by a predetermined amount (step S32: YES), the processing unit 16 determines that the shutter curtain 4 is in an overloaded state (step S33). After it is determined that the shutter curtain 4 is in an overloaded state, the drive control unit 14 outputs a stop command to the drive unit 12 to stop the opening and closing operation, and if the shutter curtain 4 is in a closing operation, outputs an open command to the drive unit 12 to start the opening operation of the shutter curtain 4. Even if the threshold for detecting an overload or the position information of the shutter curtain 4 is lost due to a power outage, the processing unit 16 can detect an overload state by detecting the speed of the shutter curtain 4.

[0072] In any one of the first to third embodiments, after recovery from a power outage, the shutter curtain 4 can be made to detect an overload.

[0073] Other Embodiments Although one embodiment of this disclosure has been described in detail above with reference to the drawings, the specific configuration is not limited to that described above, and various design changes, etc. are possible within the scope that does not deviate from the gist of this disclosure.

[0074] The control unit 13 may be realized in whole or in part by a computer. In this case, the computer may include a processor such as a CPU or a GPU, and a computer-readable recording medium. The control unit 13 may be realized by recording a program for realizing the functions of the control unit 13 in a computer on the computer-readable recording medium, and reading and executing the program recorded on the recording medium into the processor. Here, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, an optical magnetic disk, a ROM, a CD-ROM, and a storage device such as a hard disk built into a computer system. Furthermore, the "computer-readable recording medium" may also include a medium that dynamically holds a program for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line, and a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client in that case. The program may be a program for realizing a part of the functions described above, or may be a program that can realize the functions described above in combination with a program already recorded in the computer system, or may be a program that is realized using a programmable logic device such as an FPGA. [Explanation of symbols]

[0075] 2 shutter device, 3 operation device, 4 shutter curtain, 8 motor, 13 control section, 14 drive control section, 15 load detection section, 16 processing section, 17 storage section

Claims

1. A shutter device that opens and closes a shutter curtain between an upper limit position and a lower limit position, A motor that drives the shutter curtain to open and close; a shutter control device that performs the opening and closing operations by controlling the motor and executes overload detection that detects an overload state of the motor during the opening and closing operations; Equipped with The shutter control device retains the position information of the shutter curtain 4 before the power outage and the threshold value when the shutter curtain detects an overload even during a power outage. Shutter device.

2. The shutter control device causes the shutter curtain to perform an opening operation when power is restored from a power outage. The shutter device of claim 1 .

3. The shutter control device detects the overload state when the speed of the shutter curtain is equal to or lower than a certain value.

3. A shutter device according to claim 1 or 2.

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