Electric shutter apparatus

Abstract

To provide an electric shutter apparatus capable of easily setting the sensitivity of overload detection.SOLUTION: A shutter curtain is opened / closed between an upper limit position and a lower limit position. This electric shutter apparatus comprises: a motor that drives opening / closing of the shutter curtain; and a shutter control device that performs an opening / closing operation by controlling the motor, and executes overload detection for detecting the overload state of the motor in accordance with the rotation amount of the motor during the opening / closing operation. The shutter control device includes a first processing unit that sets the lower limit position on the basis of the current position of the shutter curtain when the overload state is detected through the overload detection during the closing operation of the shutter curtain and a second processing unit that sets a threshold regarding the presence / absence of the overload state during the closing operation of the shutter curtain.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] There is known an electric shutter device that uses a motor to open and close a shutter curtain. Patent Document 1 discloses an electric shutter device that is capable of detecting an abnormality such as the shutter curtain hitting an obstacle while the shutter curtain is in operation by providing a motor overload detection unit in the control unit of the drive unit.

[0003] In the electric shutter device of Patent Document 1, by utilizing an overload detection unit, it is possible to detect when the shutter curtain has reached the upper limit position and the lower limit position of the opening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-084644 A Summary of the Invention [Problem to be solved by the invention]

[0005] In small-sized electric shutter devices for windows, etc., the weight of the shutter curtain is small, so it is more difficult to detect overload compared to electric shutter devices with heavy shutter curtains. In electric shutter devices, it is necessary to adjust the sensitivity by setting an overload detection threshold according to the size of the shutter curtain.

[0006] There is a problem in that it is cumbersome and time-consuming to input the overload detection sensitivity into each device in accordance with the size of each shutter curtain at the time of shipment from the factory or at the time of installation on site.

[0007] The present disclosure has been made in consideration of the above points, and aims to provide an electric shutter device that allows the sensitivity of overload detection to be easily set. [Means for solving the problem]

[0008] A first aspect of the present disclosure is an electric shutter device that opens and closes a shutter curtain between an upper limit position and a lower limit position, comprising a motor that drives the shutter curtain to open and close, and a shutter control device that performs the opening and closing operation by controlling the motor and performs overload detection to detect an overload condition of the motor depending on the amount of rotation of the motor during the opening and closing operation, wherein the shutter control device is an electric shutter device having a first processing unit that sets the lower limit position based on the current position of the shutter curtain when an overload condition is detected by the overload detection during the closing operation of the shutter curtain, and a second processing unit that sets a threshold value for whether or not the overload condition exists during the closing operation of the shutter curtain. [Brief description of the drawings]

[0009] [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] 4 is a functional block diagram of a control unit that executes a return process for the shutter control device. FIG. [Figure 4] 10A to 10C are diagrams for explaining a control method of the electric shutter device. [Diagram 5] 10A to 10C are diagrams for explaining a control method of the electric shutter device. [Figure 6] 13A and 13B are diagrams for explaining a modified example of a control method for the electric shutter device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the electric shutter device of the present disclosure will be described with reference to Figures 1 to 6. The following embodiment shows one aspect of the present disclosure, does not limit the disclosure, and can be modified as desired within the scope of the technical idea of ​​the present disclosure. In addition, in the following drawings, the scale of each structure is different from the actual structure in order to make each configuration easier to understand.

[0011] As shown in FIG. 1, the shutter system 1 includes an electric shutter device 2 and an operation device 3.

[0012] The electric shutter device 2 is an electric shutter device that opens or closes an opening 2A such as a window or door of a building. The electric shutter device 2 includes a shutter curtain 4. The electric shutter device 2 can open or close the opening 2A by opening or closing the shutter curtain 4 based on an operation signal from an operation device 3.

[0013] The operation device 3 is connected by wire or wirelessly to the electric shutter device 2 to be operated, and is capable of mutual communication with the electric shutter device 2. The operation device 3 can be operated by a user or an operator. The operation device 3 is, for example, a remote control device, which has a means for inputting an operation signal to the electric shutter device 2.

[0014] When a user presses any of the switches of the operation device 3, the operation device 3 outputs to the electric shutter device 2 an operation signal that is a signal corresponding to the switch.

[0015] For example, the operating device 3 has an open switch SWo, a close switch SWc, and a stop switch SWt. When the open switch SWo is operated, the operating device 3 transmits a first operation signal to the electric shutter device 2 instructing the opening operation of the shutter curtain 4. When the close switch SWc is operated, the operating device 3 transmits a second operation signal to the electric shutter device 2 instructing the closing operation of the shutter curtain 4. When the stop switch SWt is operated, the operating device 3 transmits a stop signal to the electric shutter device 2 instructing the stopping of the opening operation or closing operation of the shutter curtain 4.

[0016] When a predetermined operation is performed by a user, the operation device 3 transmits a setting signal to the electric shutter device 2. For example, the predetermined operation is an operation other than a short press of one of the open switch SWo, close switch SWc, and stop switch SWt. The predetermined operation is a simultaneous press of two or more switches of the open switch SWo, close switch SWc, and stop switch SWt, or a long press of one or more switches.

[0017] The 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 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.

[0018] The initial setting button may be provided in a battery box that houses a battery. When the initial setting button is provided in the battery box, the initial setting button is configured to be operable 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.

[0019] The operation device 3 may be a mobile information terminal such as a smartphone or a tablet terminal. When the operation device 3 is a mobile information terminal, the predetermined operation may be, for example, a command operation for initial setting in an application of the mobile information terminal, such as a smartphone application.

[0020] An example of a schematic configuration of an electric shutter device 2 according to this embodiment will be described below. As shown in Fig. 1, the electric shutter device 2 includes a shutter curtain 4, guide rails 5a and 5b, and a shutter box 6.

[0021] 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.

[0022] 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 or the shutter box 6 (not shown) when the shutter curtain 4 is in the fully open state, which is the upper limit position. The baseboard portion 4b comes into contact with the slat or the shutter box 6 when the shutter curtain 4 is in the fully open state, or comes into contact with a receiving portion provided on the electric shutter device 2. The baseboard portion 4b comes into contact with the lower frame of the frame of the electric shutter device 2 or the floor surface when the shutter curtain 4 is in the fully closed state, which is the lower limit position. The slat is a parting member of the opening of the electric shutter device 2 formed by the rise of the shutter curtain 4, and may be provided at the bottom of the shutter box 6.

[0023] The guide rails 5a and 5b are provided as a pair at both ends in the width direction of the shutter curtain 4. The guide rails 5a and 5b are provided vertically to the bottom surface. The guide rails 5a and 5b regulate the lateral displacement of each slat 4a constituting the shutter curtain 4.

[0024] An example of a schematic configuration of the shutter box 6 will be described. The shutter box 6 is provided on the upper part of the electric shutter device 2. The shutter box 6 rewinds the shutter curtain 4 when the shutter curtain 4 is closed, and rewinds the shutter curtain 4 when the shutter curtain 4 is opened. The shutter box 6 includes a shaft 7, a motor 8, an output unit 9, and a shutter control device 10.

[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 drives the shaft 7 to rotate and open / close the shutter curtain 4. The motor 8 drives the shutter curtain 4 to open / close by, for example, a direct current. 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 position pulse, which is a pulse signal 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] 2, the shutter control device 10 includes a communication unit 11, a drive unit 12, and a control unit 13. 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 may be, for example, a wireless communication method such as the short-range wireless communication standard RF4CE (Radio Frequency for Consumer Electronics) or Bluetooth (registered trademark).

[0029] 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 .

[0030] 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.

[0031] The control unit 13 controls the power supply to the motor 8 based on an operation signal from the operating device 3, thereby opening or closing the shutter curtain 4 between the upper limit position Pu and the lower limit position Pl. The opening or closing operation of the shutter curtain 4 is referred to as the opening / closing operation in the following description. The upper limit position Pu is the fully open position where the shutter curtain 4 is fully open. The lower limit position Pl is the fully closed position where the shutter curtain 4 is fully closed.

[0032] When the control unit 13 receives a first operation signal from the operating device 3 via the communication unit 11, it outputs an opening command to the drive unit 12 to wind the shutter curtain 4 around the shaft 7 and perform an opening operation. The drive unit 12 rotates the motor 8 in the forward direction to perform an opening operation of the shutter curtain 4.

[0033] When the control unit 13 receives a second operation signal from the operating device 3 via the communication unit 11, it outputs a close command to the drive unit 12 to unwind the shutter curtain 4 from the shaft 7 and perform a closing operation. As a result, the drive unit 12 rotates the motor 8 in the reverse direction to perform a closing operation of the shutter curtain 4.

[0034] When the control unit 13 receives a stop signal from the operating device 3, it outputs a stop command to the driving unit 12 to stop the operation of the shutter curtain 4. As a result, the driving unit 12 stops the rotation of the motor 8 to stop the opening and closing operation.

[0035] 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 the upper limit position Pu and the lower limit position Pl are set. 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.

[0036] In the setting mode, when an overload state of the motor 8 is detected during the opening operation of the shutter curtain 4, the control unit 13 sets an 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 the closing operation of the shutter curtain 4, the control unit 13 sets a lower limit position Pl based on the current position of the shutter curtain 4.

[0037] The upper limit position Pu and the lower limit position Pl may be set in the following manner. If an overload state of the motor 8 is detected during the closing operation of the shutter curtain 4, the shutter curtain 4 is opened once by a certain amount, and then closed, and if an overload state is detected, the lower limit position Pl is set based on the current position of the shutter curtain 4. If an overload state of the motor 8 is detected during the opening operation of the shutter curtain 4, the upper limit position Pu is set based on the current position of the shutter curtain 4.

[0038] In the setting mode, the control unit 13 sets a threshold value for determining whether or not the motor 8 is in an overload state when the shutter curtain 4 is closing. The threshold value for determining whether or not the motor 8 is in an overload state is set as a load value of the motor 8 calculated according to the amount of rotation of the motor 8. The threshold value for determining whether or not the motor 8 is in an overload state corresponds to the sensitivity for detecting the overload state of the motor 8. When the threshold value is set to a large value, the overload state of the motor 8 is detected with low sensitivity, and when the threshold value is set to a small value, the overload state of the motor 8 is detected with high sensitivity.

[0039] The functional units of the control unit 13 for executing the process of the setting mode according to this embodiment will be described below with reference to FIG.

[0040] As shown in FIG. 3, 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 a predetermined operation is performed on the operating device 3, the drive control unit 14 outputs a close command to the drive unit 12 to start the closing operation of the shutter curtain 4. 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.

[0042] The load detection unit 15 detects a motor load applied to the motor 8. The load detection unit 15 includes a counter 151 and a load measurement unit 152.

[0043] 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.

[0044] 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 motor load for each position pulse that corresponds to the count value n of the counter 151, taking the pulse width An of the position pulse output from the output unit 9 as the motor load. For example, the pulse width An is the pulse width of the position pulse when the motor 8 makes one rotation.

[0045] 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. When the shutter curtain 4 reaches the upper limit position Pu and the baseboard portion 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 enters an overloaded state. As a result of the motor 8 entering an overloaded state, the rotation speed of the motor 8 decreases, and the pulse width of the position pulse increases.

[0046] 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 will be pressed against the floor or the sill. As a result of the baseboard portion 4b being pressed against the floor or the sill, a load is applied to the motor 8, causing the motor 8 to be overloaded. The rotation speed of the motor 8 slows down, and the pulse width of the position pulse increases.

[0047] When the shutter curtain 4 reaches the lower limit position Pl and the baseboard 4b abuts against the floor or the sill, and the closing operation continues, the slats bend from below. The bending of the slats places a load on the motor 8, causing the motor 8 to enter an overloaded state. The rotation speed of the motor 8 slows down, and the pulse width of the position pulse increases.

[0048] The load measurement unit 152 calculates the pulse width An of the motor 8 as load information of the motor load by measuring the pulse width of the position pulse for each position pulse, which is for each count value n. 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 An of the position pulse, which is the motor load corresponding to the count value n, to the processing unit 16. The load measurement unit 152 associates the position information n, which changes over time, with the pulse width An of the position pulse corresponding to the position information n and stores it in the storage unit 17 as load information. The storage unit 17 stores the load information for each position of the motor 8 corresponding to the position of the shutter curtain 4.

[0049] In the setting mode, the processing unit 16 sets the upper limit position Pu and the lower limit position Pl by detecting an overload. In the setting mode, the processing unit 16 sets a threshold value regarding the presence or absence of an overload state. The processing unit 16 includes a first processing unit 161 and a second processing unit 162.

[0050] The first processing unit 161 performs overload detection during the operation of the shutter curtain 4 in the setting mode. The first processing unit 161 performs first overload detection during the closing operation of the shutter curtain 4 in the setting mode, and performs second overload detection during the opening operation of the shutter curtain 4.

[0051] When the first processing unit 161 detects an overload state during the closing operation of the motor 8 by the first overload detection, it sets the lower limit position Pl based on the current position of the shutter curtain 4.

[0052] For example, the first processing unit 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 first overload detection. The first 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 during the closing operation. For example, the first 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 th1.

[0053] In the first overload detection, the first processing unit 161 detects the overload state of the motor 8 not at the lower limit position Pl where the baseboard portion 4b abuts against the floor surface or the sill, but at the pushed-in position where the shutter curtain 4 is further closed from the lower limit position Pl and pushed into the floor surface or the sill. The shutter curtain 4 in the pushed-in position is deflected from below, and a deviation occurs between the pushed-in position where the overload state of the motor 8 is detected in the first overload detection during the closing operation, and the lower limit position where there is no deflection. The deviation between the pushed-in position and the lower limit position Pl is represented by the number of counts n1 of position pulses between the pushed-in position and the lower limit position Pl.

[0054] When the first processing unit 161 detects an overload state during the opening operation of the motor 8 by the second overload detection, it sets the upper limit position Pu based on the current position of the shutter curtain 4.

[0055] For example, the first processing unit 161 may set the count value n when an overload state of the motor 8 is detected by the second overload detection to the upper limit position Pu. The second 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 during the opening operation. For example, the first processing unit 161 may reset the count value n when an overload state of the motor 8 is detected by the second overload detection to "0", and set the count value n reset to "0" to the upper limit position Pu.

[0056] In the second overload detection, the first processing unit 161 detects the overload state of the motor 8 not at the upper limit position Pu where the baseboard portion 4b abuts against the rug or the shutter box 6, but at the tightening position where the shutter curtain 4 is tightened by further opening the shutter curtain 4 from the upper limit position Pu. The distance between the tightening position and the upper limit position Pu is represented by the number of counts n2 of position pulses between the tightening position and the upper limit position Pu.

[0057] The storage unit 17 stores information on the upper limit position Pu and the lower limit position Pl set by the processing unit 16. When the processing unit 16 receives a setting signal and information on the upper limit position Pu and the lower limit position Pl is already stored in the storage unit 17, the processing unit 16 may delete the stored information on the upper limit position Pu and the lower limit position Pl. For example, when a predetermined operation is performed on the operating device 3 and the upper limit position Pu and the lower limit position Pl have already been set, the first processing unit 161 may execute an initialization process to initialize the settings of the upper limit position Pu and the lower limit position Pl. When the initialization process is executed, the opening operation of the shutter curtain 4 may be started after the initialization process.

[0058] In the setting mode, load information, which is information in which position information n is associated with a pulse width An of a position pulse corresponding to the position information n, is stored for each piece of position information n in the storage unit 17. For example, the storage unit 17 is a non-volatile memory such as a ROM (Read Only Memory), an HDD (Hard Disk Drive), or an SSD (Solid State Drive).

[0059] A method for setting the lower limit position Pl and the threshold value for determining whether or not an overload state exists in the electric shutter device 2 will be described with reference to Figs.

[0060] In the electric shutter device 2, the control unit 13 sequentially executes, for example, a lower limit position setting, an upper limit position setting, and a threshold setting for the presence or absence of an overload state in the operation of the shutter curtain 4 in a setting mode after power recovery. This will be explained in detail below. Note that the following explanation is not limited to the setting mode after power recovery, and can also be used, for example, in the initial setting when the electric shutter device 2 is installed.

[0061] Upon first detection of an overload, the first processing unit 161 causes the shutter curtain 4 to perform a closing operation and sets the lower limit position Pl. The first processing unit 161 causes the shutter curtain 4 to start descending from the upper limit position.

[0062] The horizontal axis in Fig. 4 is the shutter descent time in the setting mode, and the vertical axis is the motor load value. As shown in Fig. 4, time To indicates the time when the shutter curtain 4 starts to descend from the upper limit position. Time Tn indicates the time when the motor load value becomes equal to or greater than the threshold value S1. The threshold value S1 is a threshold for detecting the lower limit position Pl, so by setting it to a large value, the overload detection sensitivity is set low. Time Tn is the time when it is determined that the shutter curtain 4 has reached the lower limit position Pl.

[0063] The motor load value fluctuates in a relatively short cycle as the shutter curtain 4 descends, but if the shutter curtain 4 gets caught on something along the way, the motor load value fluctuates in a spike-like manner. In order to prevent the shutter curtain 4 from being erroneously determined to have reached its lower limit due to the shutter curtain 4 getting caught on something along the way, a low overload detection sensitivity is set over the entire range of movement of the shutter curtain 4. The time from time To to time Tn is, for example, about 35 seconds.

[0064] The average or maximum value of multiple points Tn obtained by performing the operation described in Fig. 4 multiple times is set as the lower limit arrival time of the shutter curtain 4 obtained in the setting mode. Note that the value of point Tn obtained by performing the operation described in Fig. 4 once may be set as the lower limit arrival time of the shutter curtain 4. In Fig. 4, the lower limit arrival time is denoted as Tnd.

[0065] The second processing unit 162 obtains the fluctuation of the motor load value at time Ta-Tb, and sets the threshold value S2 of the motor load value to be used first after the setting mode according to the obtained fluctuation of the load value. The time Ta-Tb is the time immediately before the time Tnd in order to obtain the fluctuation of the motor load value at a time close to the lower limit of the shutter curtain 4. For example, the time Ta is 3 seconds before the time Tn, and the time Tb is 1 second before the time Tn. The position of the shutter curtain 4 corresponding to the time Ta corresponds to a predetermined position located on the open side of the shutter curtain 4 rather than the fully closed position.

[0066] The first processing unit 161 raises the shutter curtain 4 by a certain amount, and then closes it from the vicinity of the position corresponding to the time Ta. Figure 5 shows the relationship between the lowering time and the motor load value when the threshold value S2 is set. The set threshold value S2 is smaller than the threshold value S1, and the overload detection sensitivity is set high.

[0067] 5, in the full-closing operation in which the threshold value S2 is set, the second processing unit 162 obtains a time Tx by subtracting a predetermined time from the lower limit reaching time Tnd obtained in the setting mode. The time Tx is, for example, one second before the lower limit reaching time Tnd.

[0068] The second processing unit 162 determines the lower limit time TN of the shutter curtain 4 by setting the motor load value after time Tx to the threshold value S2. The second processing unit 162 sets the time indicating the full closure of the shutter just before the shutter curtain 4 reaches the lower limit by referring to, for example, the motor load value at time TB one second before the lower limit time TN and the motor load value at the lower limit time TN. As an example, the second processing unit 162 sets the full closure time to time TC that is a value offset by a predetermined value from the intermediate value between the motor load value at time TB and the motor load value at the lower limit time TN. The second processing unit 162 sets the motor load value at the full closure time TC as the threshold value S3.

[0069] When the second processing unit 162 sets the threshold value S3, the first processing unit 161 performs an opening operation of the shutter curtain 4 by the second overload detection, and sets the upper limit position Pu. When the first processing unit 161 detects an overload state of the motor 8 in the same manner as during the closing operation, according to the motor load value in the opening operation of the shutter curtain 4, it sets the fully open position and the upper limit position Pu based on the current position of the shutter curtain 4.

[0070] By setting the fully closed position and the lower limit position Pl by the closing operation, and setting the fully open position and the upper limit position Pu by the opening operation, it is possible to obtain full waveform data of the motor load value from the fully open point to the fully closed point TC, and the motor load value at the lower limit point TN.

[0071] The second processing unit 162 sets a threshold value for the motor load value using the motor load value at the fully closed position of the shutter curtain 4, the motor load value at a predetermined position of the shutter curtain 4 corresponding to a time Ta that is located on the open side of the shutter curtain 4 rather than the fully closed position, and the maximum value of the motor load value between the fully open position and the predetermined position corresponding to the time Ta.

[0072] If the load value of the motor 8 at the fully closed position is Fc, the load value of the motor 8 at a predetermined position corresponding to time Ta is Fa, and the maximum load value of the motor 8 between the fully open position and the predetermined position corresponding to time Ta is P, the second processing unit 162 calculates and sets the threshold value of the motor load value using the following equation (1).

[0073] Threshold = P + Fc - Fa ... (1)

[0074] The control unit 13 uses the threshold calculated by the formula (1) to perform overload detection in the opening and closing operation of the shutter curtain 4 to detect an overload state.

[0075] In the electric shutter device 2, a threshold value is set for whether or not an overload state exists during the closing operation of the shutter curtain 4, so there is no need to input the overload detection sensitivity into each device at the time of factory shipment or on-site installation in accordance with the size of the shutter curtain 4, and the overload detection sensitivity can be easily set.

[0076] In the electric shutter device 2, even if the setting mode is started near the fully open position by operating the clutch when power is restored, for example, the first processing unit 161 closes the shutter curtain 4 upon first overload detection and sets the lower limit position Pl, so that initial setting can be performed smoothly.

[0077] Although the preferred embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to the examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present disclosure.

[0078] For example, in the electric shutter device 2, a configuration in which the sensitivity of overload detection is set using one threshold calculated by formula (1) has been exemplified, but the present invention is not limited to this configuration. For example, as shown as a modified example in Fig. 6, a configuration in which the threshold Q is set to a moving average or a fixed interval average between the fully closed position and the fully open position of the shutter curtain 4 may be used. When this configuration is adopted, by setting Q = Fc - Fa, it becomes possible to perform overload detection with optimal sensitivity in each interval without the user having to adjust the sensitivity of overload detection using the operating device 3 according to the size of the shutter curtain 4.

[0079] For example, in the electric shutter device 2, the fluctuation of the motor load value at time Ta-Tb may be obtained in the next setting mode, and the threshold value calculated by formula (1) may be used when setting the threshold value of the motor load value according to the obtained fluctuation of the load value. By calculating a new threshold value using the threshold value calculated in the previous setting mode, the accuracy of the sensitivity in overload detection can be improved by the learning effect.

[0080] For example, the electric shutter device 2 may be configured to store in the storage unit 17 the threshold motor load value set by the second processing unit 162 as a table associated with the size of the shutter curtain 4. When the threshold motor load value is stored in the storage unit 17 as a table associated with the size of the shutter curtain 4, the threshold corresponding to the size of the shutter curtain 4 can be quickly selected and used by referring to the stored table.

[0081] When the configuration is adopted in which the threshold motor load value set by the second processing unit 162 is stored in the storage unit 17 as a table corresponding to the size of the shutter curtain 4, it is preferable to update the table each time the threshold motor load value is calculated in the setting mode, in order to improve the accuracy of the sensitivity in overload detection through the learning effect.

[0082] For example, in the electric shutter device 2, in addition to a configuration in which the threshold motor load value set by the second processing unit 162 is stored in the storage unit 17 as a table corresponding to the size of the shutter curtain 4, a configuration in which the threshold motor load value is stored in advance in the storage unit 17 as a table corresponding to the size of the shutter curtain 4 and overload detection is performed may also be adopted.

[0083] The whole or part of the control unit 13 in the embodiment may be realized 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 whole or part of the functions of the control unit 13 may be realized by recording a program for realizing the functions of the computer in a computer-readable recording medium, and reading and executing the program recorded in the recording medium into the processor. 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. 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, 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]

[0084] 1...shutter system, 2...electric shutter device, 4shutter curtain, 8...motor, 10...shutter control device, 13...control unit, 17...storage unit, 161...first processing unit, 162...second processing unit

Claims

1. An electric 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 according to an amount of rotation of the motor during the opening and closing operations; Equipped with The shutter control device includes: a first processing unit that sets the lower limit position based on a current position of the shutter curtain when the overload state is detected by the overload detection during the closing operation of the shutter curtain; A second processing unit that sets a threshold value regarding the presence or absence of the overload state during a closing operation of the shutter curtain; An electric shutter device having the above structure.

2. The second processing unit includes: A load value of the motor when the shutter curtain is in a fully closed position; and a load value of the motor at a predetermined position located on the open side of the shutter curtain from the fully closed position; The threshold value is set using a maximum value of the load value of the motor between the fully open position of the shutter curtain and the predetermined position. The electric shutter device according to claim 1.

3. A load value of the motor in the fully closed position is Fc, The load value of the motor at the predetermined position is Fa, If the maximum load value of the motor between the fully open position and the predetermined position is P, then The threshold is calculated by P + Fc - Fa. The electric shutter device according to claim 2.

4. The threshold value is set to a moving average or a fixed interval average between the fully closed position and the fully open position. The electric shutter device according to claim 3.

5. An electric 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 according to an amount of rotation of the motor during the opening and closing operations; Equipped with The shutter control device includes: a first processing unit that sets the lower limit position based on a current position of the shutter curtain when the overload state is detected by the overload detection during the closing operation of the shutter curtain; a storage unit that stores the threshold value regarding the presence or absence of the overload state as a table corresponding to the size of the shutter curtain; having An electric shutter device that performs the overload detection using the threshold value that is stored in the storage section and corresponds to the size of the shutter curtain.

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