Shutter stop position setting method and electric shutter

Abstract

To provide a setting method of a shutter stop position which can accurately set a stop position of a shutter, and to provide an electric shutter.SOLUTION: A setting method of a shutter stop position is a method for setting a stop position of a shutter 7 in an electric shutter 1 for opening / closing the shutter 7 by a tubular motor, and includes: a first step of closing and moving the shutter 7, comparing a change rate of a current flowing in the tubular motor with a first threshold value, and stopping the rotation of the tubular motor based on the comparison result; a second step of opening and moving the shutter 7 after the first step; and a third step of, after the second step, closing and moving the shutter 7 at a moving speed lower than a moving speed of the shutter 7 in the first step, comparing a change rate of the current flowing in the tubular motor with a second threshold value, and setting the stop position of the shutter 7 based on the comparison result.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for setting a shutter stop position in an electric shutter, and to an electric shutter. [Background technology]

[0002] Conventionally, there is known a shutter winding structure that rotates a stepping motor for winding up and down a shutter body (shutter) (see Patent Document 1). This shutter winding structure has a control unit that determines that the upper or lower winding limit has been reached when it detects that the current in a power supply unit that energizes the stepping motor is greater than a set current, stops the rotation of the stepping motor, and then controls it to rotate a predetermined angle in the direction opposite to the rotation direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-30878 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the shutter winding structure described in Patent Document 1, the current that rotates the stepping motor can change while the shutter body is being wound up and down, and if, for example, a foreign object hits the shutter body when it is being wound down, or if the shutter body gets caught during shutter operation when being wound up (referred to in this specification as a jerking phenomenon), there is a risk of the control unit making a false detection that the shutter body has reached its upper or lower winding limit, and in order to avoid such false detection, it is necessary to set the set current to a large value. However, if the set current is set to a large value, the stepping motor will continue to rotate without stopping unless it is determined that the current rotating the stepping motor is greater than the set current, making it difficult to accurately set the upper and lower winding limit stop positions of the shutter body.

[0005] An object of the present invention is to provide a method for setting a shutter stop position that can accurately set the shutter stop position, and an electric shutter. [Means for solving the problem]

[0006] The shutter stop position setting method of the present invention is a shutter stop position setting method for setting a stop position of an electric shutter that opens and closes using an electric motor, and is characterized by having: a first step of moving the shutter in a first direction, comparing the current flowing through the electric motor with a first threshold value, and stopping the rotation of the electric motor based on the result of the comparison; a second step of moving the shutter in a second direction opposite to the first direction after the first step; and a third step of moving the shutter in the first direction after the second step at a movement speed slower than the movement speed of the shutter in the first step, comparing the current flowing through the electric motor with a second threshold value, and setting the stop position of the shutter based on the result of the comparison. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a shutter stop position setting method and an electric shutter that can accurately set the shutter stop position. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an external view showing an electric shutter according to an embodiment of the present invention; [Figure 2] FIG. 2 is a vertical cross-sectional view showing the electric shutter according to the embodiment. [Figure 3] FIG. 4 is a flowchart illustrating the operation of the electric shutter according to the embodiment. [Figure 4] FIG. 4 is a flowchart illustrating the operation of the electric shutter according to the embodiment. [Figure 5] 5A to 5C are explanatory diagrams showing an operation procedure of the electric shutter according to the embodiment. [Figure 6] 6 is a graph showing the relationship between current and time for operating the shutter of the electric shutter according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Configuration of this embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2, an electric shutter 1 according to an embodiment of the present invention is installed on the outdoor side of an opening 3 in an exterior wall 2 of a building such as a detached house, and includes a frame 4, a shutter case 5 attached to the top of the frame 4, a winding shaft 6 arranged inside the shutter case 5, and a shutter 7 that is wound or unwound around the winding shaft 6. Inside the shutter case 5 are provided a tubular motor 8 (electric motor) that rotates the winding shaft 6 (forward and reverse rotation), a balance spring (not shown) that balances the weight of the shutter 7, and a control unit 9 that controls the rotation of the tubular motor 8. The opening 3 is provided with a window 10 as a fixture, and the tubular motor 8 is equipped with an encoder. In the following description, the left-right direction of the electric shutter 1 is the X-axis direction, the up-down direction of the electric shutter 1 is the Y-axis direction, and the projection direction of the electric shutter 1 is the Z-axis direction. The X, Y, and Z-axis directions are perpendicular to each other.

[0010] The frame body 4 has an upper frame 41, a lower frame 42, and left and right vertical frames 43, and the left and right vertical frames 43 are configured to guide the left and right ends of the shutter 7 in the Y-axis direction. The shutter 7 is configured with a plurality of slats 71 connected vertically, and the uppermost slat 71 (top slat) is attached to the winding shaft 6. An end member 72 is provided at the lower end of the shutter 7 along the X-axis direction. In this electric shutter 1, the position where the end member 72 of the shutter 7 wound around the winding shaft 6 abuts against the shutter case 5 is the upper limit of the open position, and the position where the end member 72 of the shutter 7 unwound from the winding shaft 6 abuts against the lower frame 42 is the lower limit of the closed position.

[0011] The control unit 9 has a processing unit (CPU), a storage unit, a communication unit, etc., and is configured to control the current flowing through the tubular motor 8 upon receiving an operation signal from an operation unit such as a remote control. The control unit 9 operates the electric shutter 1 in at least a normal operation mode or a setting mode. In the normal operation mode, the control unit 9 receives a close signal as an operation signal and controls the current to the tubular motor 8 so that the shutter 7 moves to the lower closed position in a closed state, receives an open signal as an operation signal and controls the current to the tubular motor 8 so that the shutter 7 moves to the upper open position in an open state, and receives a stop signal as an operation signal and controls the current to the tubular motor 8.

[0012] In the setting mode, the control unit 9 controls the operation of the shutter 7 as follows to set the lower limit closing position (shutter stop position) of the shutter 7. The control in this setting mode is performed in accordance with the flow charts shown in Figs. 3 and 4. First, the control unit 9 receives an operation signal from the operation unit (process S1) to operate in the setting mode, rotates the tubular motor 8 forward at a predetermined rotation speed R1 (rpm) and unwinds the shutter 7 from the winding shaft 6, thereby moving the shutter 7 downward (first direction) in the Y-axis direction to close (lower) as shown in FIG. 5A, and acquires the current current value I0 supplied to the tubular motor 8 in a predetermined cycle t during this first closing movement (process S2). Note that the past current value I n A predetermined number of I1, I2...I k ) Note that the current values ​​I0 and I n The pulse positions P0 and P1 from the encoder correspond to n Also record this. Next, the current value I0 just before the current value In is set to I1 (process S3), and it is determined whether the rate of change in current calculated based on I0 and I1 exceeds a threshold value α (first threshold value) (process S4). The threshold value α is set to 3.0 here, but it is not limited to this value and can be set to any appropriate threshold value. The determination is made using the following mathematical formula (1). Note that the threshold value α is set to a value greater than a threshold value β (described later). This reduces the risk of the closing movement being stopped at the position where the foreign object interferes with the shutter 7, even if the shutter 7 has not yet reached the lower limit closed position and a resistance force against the closing movement of the shutter 7 increases, thereby increasing the current supplied to the tubular motor 8.

[0013]

number

[0014] In the process S4, when it is determined that the rate of change of the current calculated by the formula (1) based on the current values ​​I0 and I1 exceeds the threshold value α, it is determined whether or not the determination that the rate of change of the current has exceeded the threshold value α has occurred a predetermined number of times in succession (process S5). If it is determined that the determination that the rate of change of the current has exceeded the threshold value α has occurred a predetermined number of times, the forward rotation of the tubular motor 8 is stopped to stop the closing movement of the shutter 7 (the first closing state is reached), and a provisional value of the closing lower limit position in the first closing movement of the shutter 7 is set (process S6). In this embodiment, the I value at the first time that it is determined that the rate of change of the current has exceeded the threshold value α among the predetermined number of determinations in process S5 is n Position P corresponding to n is set as the provisional value. If it is determined in step S5 that the determination that the current has exceeded the predetermined number of times has not been made, the process returns to step S2 while continuing to rotate the tubular motor 8, and a new current current value I0 is obtained, and the current value I0 is compared with the current value I0 at the time of the first determination that the current has exceeded the predetermined value. n It is again determined whether or not the rate of change of the current calculated by the formula (1) based on the above has exceeded the threshold value α (steps S2 to S4), and the subsequent steps described above are then performed. In S4, if it is determined that the rate of change of the current calculated by the formula (1) based on the current values ​​I0 and I1 does not exceed the threshold value α, the past current value In The value n is recorded as n+1 (step S7), and it is determined whether n exceeds the maximum number k to be recorded or is equal to or less than the maximum number k (step S8). If it is determined that n exceeds the maximum number k to be recorded, the process returns to step S2, a new current value I0 is acquired, and the subsequent steps are repeated. If it is determined that n is equal to or less than the maximum number k to be recorded, the process returns to step S4 and the subsequent steps are repeated. The above-described steps S2 to S8 are the first step in this embodiment.

[0015] After step S6, the tubular motor 8 is rotated in the reverse direction, and the shutter 7 is opened (raised) a predetermined amount upward (in the second direction) in the Y-axis direction as shown in FIG. 5B, based on the provisional value set as the lower limit closing position for the first closing movement of the shutter 7, and then stopped (S9). In this embodiment, the shutter 7 is raised by 60 mm. The above-mentioned step S9 is the second step in this embodiment.

[0016] After step S9, the tubular motor 8 is rotated forward at a rotation speed R2 (rpm) to unwind the shutter 7 from the winding shaft 6, thereby causing the shutter 7 to move downward (in the first direction) in the Y-axis direction to close (descend), as shown in FIG. 5C. During this second closing movement, the current current value I0 supplied to the tubular motor 8 in the period t is acquired (step S10). Here, the rotation speed R2 of the tubular motor 8 is lower than the rotation speed R1, and therefore the movement speed of the closing movement (second closing movement) of the shutter 7 is slower than the movement speed of the first closing movement. Note that the past current value I n A predetermined number of I1, I2...I k ) Note that the current values ​​I0 and I n The pulse positions P0 and P1 from the encoder correspond to n Also record this. Next, the current value I0 just before the current value I nis set to I1 (process S11), and it is determined whether the rate of change of the current calculated based on I0 and I1 exceeds a threshold value β (second threshold value) (process S12). Here, the threshold value β is set to 1.5, which is a value smaller than the threshold value α, but it is not limited to this value and can be set to any appropriate value smaller than the threshold value α. The determination is made using the following formula (2). Note that although the threshold value β is a value smaller than the threshold value α, the closing movement distance is shorter than the first closing movement, so foreign objects are less likely to become caught, and the movement does not require much time even at low speeds.

[0017]

number

[0018] In the process S12, when it is determined that the rate of change of the current calculated by the formula (2) based on the current values ​​I0 and I1 exceeds the threshold value β, it is determined whether or not the determination that the rate of change of the current has exceeded the threshold value β has occurred a predetermined number of times in succession (process S13). If it is determined that the determination that the rate of change of the current has exceeded the threshold value β has occurred a predetermined number of times, the forward rotation of the tubular motor 8 is stopped to stop the closing movement of the shutter 7 (actual stop position), and the closing lower limit position (shutter stop position) for the second closing movement of the shutter 7 is set (process S14). In this embodiment, the I value at the first time that it is determined that the rate of change of the current has exceeded the threshold value β among the predetermined number of determinations in process S13 is set. n Position P corresponding to n is set as the lower limit position (shutter stop position). If it is determined in step S13 that the determination that the current has been exceeded has not been made the predetermined number of times, the process returns to step S10 while continuing to rotate the tubular motor 8, and a new current value I0 is obtained, and the current value I0 is compared with the current value I0 at the time of the first determination that the current has been exceeded. n It is again determined whether the rate of change of the current calculated by the formula (2) based on the above has exceeded the threshold value β (steps S10 to S12), and the subsequent steps described above are then performed. In step S12, if it is determined that the rate of change of the current calculated by equation (2) based on the current values ​​I0 and I1 does not exceed the threshold value β, the past current value I nThe value n is recorded as n+1 (process S15), and it is determined whether n exceeds the maximum number k to be recorded or is equal to or less than the maximum number k (process S16). If it is determined that n exceeds the maximum number k to be recorded, the process returns to process S10, a new current value I0 is acquired, and the subsequent processes are performed again. If it is determined that n is equal to or less than the maximum number k to be recorded, the process returns to process S12 and the subsequent processes are performed again. The above-described steps S10 to S16 constitute the third step in this embodiment. In this embodiment, after the lower limit closure position is set in step S14, a release operation (step S17) is performed to raise the shutter 7 from the actual stop position to the set lower limit closure position, and the shutter 7 is finally stopped.

[0019] In this manner, the control unit 9 sets the lower closure limit position of the shutter 7 in the setting mode. In FIG. 6, the actual stop position in the third step is ST1, the set lower closure limit position in the third step is ST2, the actual stop position in the first step is ST3, and the provisional lower closure limit position in the first step is ST4. The difference D1 between the actual stop position ST1 in the third step and the set lower closure limit position ST2 (see FIG. 6B) is smaller than the difference D2 between the actual stop position ST3 in the first step and the provisional lower closure limit position ST4 (see FIG. 6A). The lower closure limit position is set more accurately because the difference D1 is smaller than the difference D2. In the graph of FIG. 6, the vertical axis represents current (mA), and the horizontal axis represents time (sec). The actual stop positions ST1 and ST3 and the set lower closure limit positions ST2 and ST4 are encoder pulse positions corresponding to the time the shutter 7 was moved to close.

[0020] [Variations] In the above embodiment, in processes S5 and S13, it is determined whether the rate of change of the current exceeds the threshold values ​​α and β a predetermined number of times consecutively, but this is not limited to this, and the rate may be intermittent rather than continuous, or the determination may be made only once. In the above embodiment, the control unit 9 determines whether the rate of change of the current exceeds the thresholds α and β in the first and third steps, but this is not limited to this, and the control unit 9 may also determine whether the current value I0 exceeds the corresponding first and second thresholds in the first and third steps. In the embodiment, in the setting mode, the lower limit closed position of the shutter 7 is set as the shutter stop position of the electric shutter 1, but this is not limited to this, and the upper limit open position of the shutter 7 may be set. In this case, the first direction is the direction in which the shutter 7 moves to open, and the second direction is the direction in which the shutter 7 moves to close. Here, when the shutter 7 moves to open, the current supplied to the tubular motor 8 fluctuates due to a jerking phenomenon or the like, but because the threshold value α is set to a large value, erroneous detection of the stop position can be suppressed.

[0021] [Summary of the invention] The shutter stop position setting method of the present invention is a shutter stop position setting method for setting a stop position of an electric shutter that opens and closes using an electric motor, and is characterized by having: a first step of moving the shutter in a first direction, comparing the current flowing through the electric motor with a first threshold value, and stopping the rotation of the electric motor based on the result of the comparison; a second step of moving the shutter in a second direction opposite to the first direction after the first step; and a third step of moving the shutter in the first direction after the second step at a movement speed slower than the movement speed of the shutter in the first step, comparing the current flowing through the electric motor with a second threshold value, and setting the stop position of the shutter based on the result of the comparison. According to the shutter stop position setting method of the present invention, in the third step, the shutter is moved in the first direction again from the position to which it was moved in the second direction in the second step, so the movement distance can be set shorter than in the first step, making it less likely that the shutter stop position will be set to an unintended position due to erroneous detection caused by, for example, a foreign object hitting the shutter or the shutter jerking.In addition, in the third step, the shutter is moved at a speed slower than that in the first step and the second threshold value compared with the current flowing through the electric motor is set to a value smaller than the first threshold value, so the shutter stop position can be set more accurately than when the shutter stop position is set in the first step.Furthermore, in the first step, the shutter is moved at a speed faster than that in the third step and the first threshold value is greater than the second threshold value, so the time required to set the shutter stop position using the shutter stop position setting method of the present invention can be shortened.

[0022] In the method for setting the shutter stop position of the present invention, the comparison of the current flowing through the electric motor with the second threshold value is performed by determining whether or not the rate of change of the current flowing through the electric motor exceeds the second threshold value, and if it is determined that the rate of change of the current has exceeded the second threshold value, the stop position of the shutter is set, but if it is not determined that the rate of change of the current has exceeded the second threshold value, it is not necessary to set the stop position of the shutter. With this configuration, for example, when comparing the current value flowing through an electric motor with a second threshold value, the current value flowing through the electric motor differs depending on the type of shutter, which has various dimensions and weights, so the value of the second threshold value needs to be set each time depending on the type of shutter.However, by comparing the rate of change of the current flowing through the electric motor with the second threshold value, the second threshold value can be set to a common value for the various types of shutters mentioned above, reducing the effort required for setting.

[0023] In the method for setting the shutter stop position of the present invention, it is determined whether the rate of change of the current continuously exceeds the second threshold value, and if the determination is true, it is determined that the rate of change of the current has exceeded the second threshold value and the shutter stop position is set, but if the determination is not true, the shutter stop position does not need to be set. With this configuration, it is determined whether the rate of change of the current has continuously exceeded the second threshold value, and therefore, compared to when the rate of change of the current has intermittently exceeded the second threshold value, the risk of false detection occurring due to a foreign object hitting the shutter or the shutter jerking, causing the shutter to stop at an unintended position, is further reduced.

[0024] In the method for setting the shutter stop position of the present invention, the first direction may be the closing movement direction of the shutter, the second direction may be the opening movement direction of the shutter, and the stop position of the shutter set in the third step may be the lower limit closing position of the shutter. With this configuration, the risk of the shutter stopping at an unintended position due to an erroneous detection occurring when a foreign object hits the shutter can be reduced, while the lower limit closure position of the shutter can be set accurately.

[0025] In the method for setting the shutter stop position of the present invention, the first direction may be the direction in which the shutter moves to open, the second direction may be the direction in which the shutter moves to close, and the stop position of the shutter set in the third step may be the upper limit open position of the shutter. With this configuration, it is possible to accurately set the upper limit of the open position of the shutter while reducing the risk of the shutter stopping at an unintended position due to an erroneous detection caused by a jerking phenomenon occurring in the shutter.

[0026] The electric shutter of the present invention has a winding shaft rotated by an electric motor, a shutter wound or unwound on the winding shaft, and a control unit that controls the rotation of the electric motor, and the control unit may set the shutter stop position using the shutter stop position setting method of the present invention described above. With this configuration, it is possible to configure an electric shutter that can achieve the same effects as those achieved by the shutter stop position setting method of the present invention described above. [Explanation of symbols]

[0027] 1...electric shutter, 10...window, 2...exterior wall, 3...opening, 4...frame body, 41...upper frame, 42...lower frame, 43...vertical frame, 5...shutter case, 6...winding shaft, 7...shutter, 71...slat, 72...end member, 8...tubular motor (electric motor), 9...control unit, I0...current current value, I n ...Past current value, α, β...threshold value, S1 to S17...processing, ST1, ST3...actual stop position, ST2, ST4...lower closing limit position, D1, D2...difference.

Claims

1. A method for setting a stop position of an electric shutter that opens and closes using an electric motor, comprising: a first step of moving the shutter in a first direction, comparing a current flowing through the electric motor with a first threshold value, and stopping rotation of the electric motor based on a result of the comparison; a second step of moving the shutter in a second direction opposite to the first direction after the first step; and a third step of, after the second step, moving the shutter in the first direction at a moving speed lower than the moving speed of the shutter in the first step, comparing the current flowing through the electric motor with a second threshold value that is lower than the first threshold value, and setting a stop position of the shutter based on the result of the comparison. A method for setting a shutter stop position.

2. 2. The shutter stop position setting method according to claim 1, The comparison of the current flowing through the electric motor with the second threshold value is performed by: determining whether a rate of change of the current flowing through the electric motor exceeds the second threshold value; When it is determined that the rate of change of the current exceeds the second threshold value, a stop position of the shutter is set; If it is not determined that the rate of change of the current exceeds the second threshold value, the stop position of the shutter is not set. A method for setting a shutter stop position.

3. 3. The shutter stop position setting method according to claim 2, determining whether the rate of change of the current continuously exceeds the second threshold; If the determination is affirmative, it is determined that the rate of change of the current has exceeded the second threshold value, and a stop position of the shutter is set; If the determination is not true, the shutter stop position is not set. A method for setting a shutter stop position.

4. 2. The shutter stop position setting method according to claim 1, the first direction is a closing movement direction of the shutter, the second direction is the opening movement direction of the shutter, The stop position of the shutter set in the third step is set as the lower limit closing position of the shutter. A method for setting a shutter stop position.

5. 2. The shutter stop position setting method according to claim 1, the first direction is a direction in which the shutter moves to open; the second direction is a closing movement direction of the shutter, The stop position of the shutter set in the third step is set as the upper limit of the opening position of the shutter. A method for setting a shutter stop position.

6. The device includes a winding shaft that is rotated by an electric motor, a shutter that is wound onto or unwound from the winding shaft, and a control unit that controls the rotation of the electric motor, The control unit sets the shutter stop position by the shutter stop position setting method according to any one of claims 1 to 5. A distinctive electric shutter.

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