Shutter device

Abstract

To provide a shutter device capable of properly controlling open / close operation of the shutter curtain by using multiple different numbers of drive units depending on the open / close position of the shutter curtain.SOLUTION: A shutter device includes: multiple drive units (6A' 6B'); multiple wires (W1, W2) each of which is wound up / unwound by each of the multiple drive units; a shutter curtain 1' connected to the multiple wires, which opens or closes an opening by being raised and lowered by winding and unwinding multiple wires; and control means that controls open / close operation of the shutter curtain 1'. Each drive unit has open / close position detection means for detecting the open / close position of the shutter curtain 1'. The open / close position detection means includes intermediate position detection means (ENC1, ENC2, BS1, BS2) that detect an intermediate position between an upper limit position and a lower limit position. The control means controls the open / close operation of the shutter curtain 1' by increasing or decreasing the number of drive units on the basis of the detection by the intermediate position detection means.SELECTED DRAWING: Figure 67

Description

Technical Field

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[0001] The present invention relates to a shutter device.

[0002] A shutter device has been proposed that includes a shutter curtain composed of a plurality of aggregates extending in the opening width direction and a sheet provided on the plurality of aggregates. A suspension wire is fixed to the lower end of the shutter curtain, and when the shutter curtain is opened, the suspension wire is wound up to lift and open the shutter curtain by folding the sheet while overlapping the aggregates (Patent Document 1).

[0003] In a conventional shutter device, since a single driving device is used to raise and lower the shutter curtain to open and close the opening, when trying to open and close an opening with a large opening width dimension using a large shutter curtain, there is a problem that the opening width is limited due to insufficient capacity of the driving device. Although the insufficient capacity can be eliminated by using a plurality of driving devices, when the width dimension of the opening is different in the height direction (upper part and lower part), it is necessary to adapt the shape of the shutter curtain to the opening shape, and it may be advantageous to raise and lower the shutter curtain using a different number of driving devices according to the opening and closing position of the shutter curtain.

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0006] In one aspect, it includes N drive devices. When the shutter curtain is at the lower limit position to the intermediate position, it is opened and closed by n (n < N) drive devices. When the shutter curtain is at the intermediate position to the upper limit position, it is opened and closed by N drive devices. In the second embodiment described later, when the shutter curtain is at the lower limit position to the intermediate position, it is opened and closed by 2 drive devices. When the shutter curtain is at the intermediate position to the upper limit position, it is opened and closed by 3 drive devices.

[0007] In one aspect, the control means stops the opening and closing operation of the shutter curtain in response to the detection of the intermediate position. [[ID=2,6]]In one aspect, after stopping, the shutter curtain opens and closes again manually (input from the operation unit). In one aspect, after stopping, the shutter curtain opens and closes again electrically (such as a timer).

[0008] In one aspect, the intermediate position detection means, Mechanical detection means for detecting the intermediate position when the shutter curtain descends, It includes an electrical detection means for detecting an intermediate position when the shutter curtain is raised.

[0009] In one embodiment, each opening / closing position detection means detects the position of each wire based on the amount of rotation of each drive device, and the position of the wire corresponds to the opening / closing position of the shutter curtain. In one embodiment, the opening / closing position detection means is an encoder. In one embodiment, a position comparison means for comparing the open / closed positions detected by each open / closed position detection means, A determination means for determining whether the opening and closing operation is normal or abnormal based on the comparison result obtained by the position comparison means, It is equipped with.

[0010] In a more specific embodiment, for example, when the shutter curtain is opened and closed by two drive units when it is between the lower limit position and the intermediate position, the position comparison means calculates the difference in the opening and closing positions of the shutter curtain corresponding to the two drive units (the difference in the amount the first wire and the second wire are pulled out), and stops the opening and closing operation of the shutter curtain when the difference in position is greater than a threshold. When the shutter curtain is in the intermediate to upper limit position and is opened and closed by three drive units, the position comparison means calculates the difference in the opening and closing positions of the shutter curtain corresponding to the three drive units (difference in the amount of extension of the first wire and the second wire, difference in the amount of extension of the first wire and the third wire, and difference in the amount of extension of the second wire and the third wire), and stops the opening and closing operation of the shutter curtain when the difference in at least one position is greater than a threshold. [Effects of the Invention]

[0011] In the shutter device according to the present invention, by detecting an intermediate position between the upper limit position and the lower limit position using an intermediate position detection means, the opening and closing operation of the shutter curtain can be controlled by increasing or decreasing the number of drive devices based on the detection of the intermediate position, thereby enabling appropriate control of the opening and closing operation of the shutter curtain to correspond to opening shapes with different opening width dimensions in the height direction.

[0012] In the mode where the opening and closing operation of the shutter curtain is stopped according to the detection of the intermediate position by the control means, at the intermediate position where the number of driving devices changes, the opening and closing operation of the shutter curtain is temporarily stopped, so that when the number changes, N driving devices or the nth driving device can be driven in synchronization, and the opening and closing operation of the shutter curtain can be stably performed.

Brief Description of the Drawings

[0013] [Figure 1] It is a front view of the sheet shutter according to the first embodiment (in the state where the opening is fully closed). [Figure 2] It is a front view of the sheet shutter according to the first embodiment (in the state where the opening is fully open). [Figure 3] It is the upper end part of the plan view and front view of the sheet shutter according to the first embodiment. [Figure 4] It is a longitudinal sectional view of FIG. 1. [Figure 5] It is a side view of the shutter curtain according to the first embodiment (in the state where the opening is fully closed). [Figure 6] It is a longitudinal sectional view of FIG. 2. [Figure 7] It is a side view of the shutter curtain according to the first embodiment (in the state where the opening is fully open). [Figure 8] It is a side view of the aggregate according to this embodiment. [Figure 9] It shows the guide plates provided at both ends in the width direction of the aggregate according to this embodiment. [Figure 10] It is a plan view of the width direction end of the sheet shutter according to this embodiment. [Figure 11] The upper figure is a longitudinal sectional view of FIG. 10, and the lower figure is a front view of FIG. 10. [Figure 12] It is a partially enlarged view of the sheet width direction end (aggregate and sheet pressing member) of FIG. 1. [Figure 13] It is a partially enlarged view of the aggregate part of FIG. 4. [Figure 14] It is a plan view (A), a front view seen from the B direction (B), and a front view seen from the C direction (C) of the bottom member. [Figure 15] This is a magnified view of the left side of Figure 14. [Figure 16] This is a magnified view of the right side of Figure 14. [Figure 17] This is a cross-sectional view of the upper guided portion, wire fixing portion, and lower guided portion of the bottom member. [Figure 17A] The guide rails according to this embodiment are shown, with the right figure representing the first guide rail and the left figure representing the second guide rail. [Figure 18] This is a magnified view of the upper guided portion of Figure 17. [Figure 19] Figure 17 is a magnified view of the wire fixing section. [Figure 20] This is a magnified view of the lower guided portion of Figure 17. [Figure 21] This is a magnified view of the end portion in the width direction of the sheet in Figure 1 (the upper frame of the bottom member and the sheet retaining member). [Figure 22] This is a diagram showing the end plate assembly of the bottom member. [Figure 23] Figure 4 is a side view of the lower part of the shutter curtain in the fully closed position. [Figure 24] This shows a configuration in which the height positions of a pair of wire fixing parts provided on the end plate of the bottom member are different. [Figure 25] This is a partially enlarged view showing the upper winding device in Figure 4. [Figure 26] This is a magnified view of a portion of the plan view shown in Figure 3. [Figure 27] This is a partially enlarged plan view of the upper portion of the sheet shutter according to the first embodiment, showing the upper limit switch and the emergency switch (beam H and mounting plate P are omitted). [Figure 28] This is a vertical cross-sectional view of the upper part of the sheet shutter (with the opening fully open), showing the upper limit switch in the OFF position. [Figure 29] This is a vertical cross-sectional view of the upper part of the sheet shutter (with the opening fully open), showing the emergency switch in the OFF position. [Figure 30]This shows the operating and locking parts of the locking device of the bottom lock mechanism (viewed from the indoor side). [Figure 31] The locking mechanism of the bottom lock is shown (Figure 30 viewed from the right or Figure 32 viewed from the left). [Figure 32] The bottom locking mechanism is shown, with the locking part indicated by the solid line being the locked position and the locking part indicated by the dashed line being the unlocked position. [Figure 33] This is a cross-sectional view of the widthwise end of the bottom member, showing the bottom locking mechanism. [Figure 34] This is a partial longitudinal cross-sectional view showing the overlapping state of the frame and bottom member of a shutter curtain in its fully open position. [Figure 35] This is a front view showing a sheet according to the first embodiment. [Figure 36] This is a front view of the sheet shutter according to the second embodiment (with the opening fully closed). [Figure 37] This is a front view of the sheet shutter according to the second embodiment (with the opening fully open). [Figure 38] This is the upper end portion of the sheet shutter plan view and front view according to the second embodiment. [Figure 39] This is a magnified view of a portion of Figure 38. [Figure 40] Figure 36 shows longitudinal cross-sectional views; the left figure shows longitudinal cross-sectional views of the upper and middle sections, and the right figure shows longitudinal cross-sectional views of the upper and lower sections. [Figure 41] This is a side view of the shutter curtain according to the second embodiment (with the opening fully closed). [Figure 42] This is a vertical side view of the upper and middle portions of the shutter curtain according to the second embodiment (with the opening fully closed). [Figure 43] Figure 37 shows longitudinal cross-sectional views; the left figure shows longitudinal cross-sectional views of the upper and middle sections, and the right figure shows longitudinal cross-sectional views of the upper and lower sections. [Figure 43A] This figure shows the positional relationship between the intermediate guide rail 3 and the folded lower portion (overlapping bottom member and frame) when the opening of the sheet shutter according to the second embodiment is fully open (the folded sheet is omitted). [Figure 44] The second embodiment shows a vertical cross-sectional view of a shutter curtain (with the opening fully open), with the left figure being a vertical cross-sectional view of the upper and middle sections, and the right figure being a vertical cross-sectional view of the upper and lower sections. [Figure 45] This is a partially enlarged view of the first side in the visible width direction of the intermediate opening of the opening that is opened and closed by the shutter curtain according to the second embodiment. [Figure 46] This is a partially enlarged view of the second side in the visible width direction of the intermediate opening of the opening that is opened and closed by the shutter curtain according to the second embodiment. [Figure 47] This figure shows the closed state of the first side in the width direction of the intermediate opening shown in Figure 45. [Figure 48] This figure shows the closed state of the second side in the visible width direction of the intermediate opening shown in Figure 46. [Figure 48A] This is a diagram showing the panel body of the intermediate section (second intermediate section). [Figure 49] This is a plan view of the structural members of the upper part of the shutter curtain according to the second embodiment. [Figure 50] This is a plan view of the bottom member (upper bottom) of the upper portion of the shutter curtain according to the second embodiment. [Figure 51] This figure shows the bottom member and intermediate portion of the upper part of the shutter curtain according to the second embodiment. [Figure 52] This is a partially enlarged view of the first side of the bottom member of the upper portion of the shutter curtain according to the second embodiment. [Figure 53] This is a partially enlarged view of the second side of the bottom member of the upper portion of the shutter curtain according to the second embodiment. [Figure 54] Figure 51 is a partially enlarged view of the lower part of the first intermediate portion provided on the bottom member of the upper part of the shutter curtain according to the second embodiment. [Figure 55] Figure 51 is a partially enlarged view of the lower part of the second intermediate portion provided on the bottom member of the upper part of the shutter curtain according to the second embodiment. [Figure 56]Figure 51 is a longitudinal cross-sectional view showing the side of an intermediate guide rail provided in the middle section of the shutter curtain according to the second embodiment. [Figure 56A] This diagram shows the upper end of the first guide rail of the lower guide rail. [Figure 57] This is a front view of the widthwise end of the intermediate section provided with the intermediate guide rail according to the second embodiment; the left figure shows the first guide rail, and the right figure shows the second guide rail. [Figure 58] This diagram shows the alignment of the lower end of the intermediate guide rail and the upper end of the lower guide rail according to the second embodiment. [Figure 59] This diagram shows the alignment of the intermediate guide rail and the lower end of the intermediate section with the upper end of the lower guide rail according to the second embodiment. [Figure 60] This is a partially enlarged plan view of the upper portion of the sheet shutter according to the second embodiment, showing the upper limit switch and the emergency switch (beam H and mounting plate P are omitted). [Figure 61] In the second embodiment, this is a partial longitudinal cross-sectional view showing the overlapping state of the frame and bottom member of the shutter curtain in the fully open state. [Figure 62] This is a front view showing a sheet according to the second embodiment. [Figure 63] This is a schematic diagram of a sheet shutter according to the first embodiment. [Figure 64] This is a block diagram showing the control of a sheet shutter according to the first embodiment. [Figure 65] This is a flowchart of the opening operation of the sheet shutter according to the first embodiment. [Figure 66] This is a flowchart of the closing operation of the sheet shutter according to the first embodiment. [Figure 67] This is a schematic diagram of a sheet shutter according to the second embodiment. [Figure 68] This is a block diagram showing the control of the sheet shutter according to the second embodiment. [Figure 69]This is a flowchart of the opening operation (from fully closed position to intermediate position) of the sheet shutter according to the second embodiment. [Figure 70] This is a flowchart of the opening operation (from the intermediate position to the fully open position) of the sheet shutter according to the second embodiment. [Figure 71] This is a flowchart of the closing operation of the sheet shutter according to the second embodiment (from the fully open position to the intermediate position). [Figure 72] This is a flowchart of the closing operation of the sheet shutter according to the second embodiment (from the intermediate position to the fully closed position). [Figure 73] This is a diagram showing the interlocking control unit. [Figure 74] This diagram shows the single-acting control unit and the operating mode selector switch. [Figure 75] Multiple status lamps indicating the status of the shutter device according to the second embodiment are shown. [Figure 76] This flowchart shows the control based on abnormality detection in the position comparison unit. Detailed description of the invention

[0014] The sheet shutter according to this embodiment will be described in detail with reference to the drawings. In this specification, the present invention will be described based on two embodiments, the first embodiment and the second embodiment. The main difference between the first embodiment and the second embodiment is the shape of the opening and the shape of the shutter curtain. The sheet shutter according to this embodiment opens and closes a large opening, but the size of the opening and the shutter curtain is not limited. In this specification, it should be noted that the term "suspension wire W" may be used as a general term for wires (first wire W1, second wire W2, third wire W3), "sheet 4" as a general term for sheets (first sheet 4A, second sheet 4B, etc.), "pulley 5" as a general term for pulleys (first pulley 5A, second pulley 5B, etc.), "winding device 6" as a general term for winding devices (first winding device 6A, second winding device 6B, etc.), "mounting plate P" as a general term for mounting plates (mounting plate P1, mounting plate P2), "guide rail G" as a general term for guide rails (upper guide rail G1, lower guide rail G2, etc.), and "beam H" as a general term for beams (beam H1, H2, etc.).

[0015] [I] First Embodiment [A] Overall configuration The overall configuration of the sheet shutter according to the first embodiment will be described with reference to Figures 1 to 7. The sheet shutter according to the first embodiment comprises a shutter curtain 1 for opening and closing an opening, guide rails G located on both sides in the width direction of the opening and guiding both ends of the shutter curtain 1 in the width direction in the height direction, and a lifting and lowering drive device for the shutter curtain 1. In this specification, the width direction of the opening is the width direction of the shutter curtain 1 and the components of the shutter curtain 1, and means the visible direction.

[0016] The opening opened and closed by the sheet shutter 1 according to the first embodiment is a rectangular opening. A pair of beams H1 and H2 are located above the opening and extend in the direction of the opening width, and the upper end of the opening is formed by an upper end member 14, which has a dish-shaped cross-section and extends in the direction of the opening width so as to span the lower ends of the pair of beams H1 and H2. The lower end of the opening is defined by the floor surface FL. The ends of the opening in the width direction are defined by the left and right structural members C and the left and right guide rails G fixed to the structural members C.

[0017] The shutter curtain 1 has a predetermined depth and consists of a plurality of structural members extending in the direction of the opening width, and sheets provided on the plurality of structural members. In this embodiment, the plurality of structural members consists of a plurality of structural members 2 and a bottom member 3 located at the lowest position. The structural members 2 and the bottom member 3 have a predetermined depth, and the sheet 4 according to this embodiment consists of two sheets: a first sheet 4A fixed to the first side in the depth direction of each structural member 2 and the bottom member 3 and forming the first visible surface of the shutter curtain 1, and a second sheet 4B fixed to the second side in the depth direction of each structural member 2 and the bottom member 3 and forming the second visible surface of the shutter curtain 1. When the opening is fully closed, the first sheet 4A and the second sheet 4B are spaced apart and facing each other in the depth direction. The upper ends of the first sheet 4A and the second sheet 4B are fixed to the lower surfaces of a pair of beams H1 and H2 via an upper end member 14 above the opening.

[0018] The lifting drive device comprises a wire whose lower end is connected to the bottom member 3, and a winding device provided above the opening to which the upper end of the wire is connected. The lower ends of the first wire W1 and the second wire W2 are connected to both ends in the width direction of the bottom member 3, which is located at the lowest point of the shutter curtain 1. The first wire W1 is wound around the first pulley 5A above the opening and connected to the first winding device 6A provided above the opening. The second wire W2 is wound around the second pulley 5B above the opening and connected to the second winding device 6B provided above the opening.

[0019] When the opening is closed, the first wire W1 and the second wire W2 are extended, causing the shutter curtain 1 to extend in an extended state where the frame members 2 and bottom members 3 are separated in the height direction, and the sheets 4A and 4B face each other and extend vertically in the height direction. When the opening is opened, the first wire W1 and the second wire W2 are retracted, causing the shutter curtain 1 to extend in a folded state where multiple frame members 2 and bottom members 3 overlap in the height direction, and the first sheet 4A and the second sheet 4B are folded on the first and second sides, respectively.

[0020] [B] Shutter curtain The shutter curtain 1 according to this embodiment is formed from a plurality of elongated members 2 extending in the opening width direction and a bottom member 3 at the lower end, and a first sheet 4A and a second sheet 4B forming the first and second visible surfaces of the shutter curtain 1. In the shutter curtain 1 according to this embodiment, the members 2 and the sheet retaining members 7 are formed from aluminum profiles, but they may also be made of steel, stainless steel, etc. Among the components of the shutter curtain 1, elements other than the members 2 and the sheet retaining members 7 (excluding the sliding member 26) are formed from steel or the like.

[0021] [B-1] Aggregate As shown in Figure 8, the structural member 2 has a predetermined depth and consists of a horizontal section 20 extending in the opening width direction (visible direction) and contact sections 21, 21 provided at both ends of the horizontal section in the depth direction and extending in the opening width direction. The height dimension of the contact sections 21 is greater than the height (thickness) of the horizontal section 20, the upper end 22 of the contact section 21 is located above the upper surface 200 of the horizontal section 20, and the lower end 23 of the contact section 21 is located below the lower surface 201 of the horizontal section 20. The contact sections 21, 21 have a visible surface 210 which is a vertical surface, and the first sheet 4A and the second sheet 4B are fixed in contact with the visible surface 210, respectively (see Figure 13).

[0022] When the opening is opened, the vertically adjacent structural members 2 overlap, but in the vertically adjacent structural members 2, one of the lower end portion 23 of the contact portion 21 of the upper structural member 2 and the upper end portion 22 of the contact portion 21 of the lower structural member 2 is concave and the other is convex, so that when the opening is opened, the lower end portion 23 of the upper structural member 2 and the upper end portion 22 of the lower structural member 2 fit together.

[0023] In this embodiment, the upper end portion 22 of the aggregate 2 is a recess, and the recess consists of a horizontal surface 220 that forms the bottom surface of the recess, an outer convex portion 221 located outside the horizontal surface 220 and having an inclined surface 2210, and a convex portion 222 located inside the horizontal surface 220. The lower end portion 23 of the aggregate 2 is a downward convex portion, and the convex portion consists of a horizontal surface 230 that forms the lower end surface of the convex portion, an outer inclined surface 231, an inner vertical surface 232, and an inner horizontal surface 233. When adjacent aggregates 2 are superimposed vertically, the recess of the upper end portion 22 of the lower aggregate 2 fits into the convex portion of the lower end portion 23 of the upper aggregate 2 (see Figure 34).

[0024] [B-1-1] Guide receiver As shown in Figures 10 and 11, horizontal guide plates 24 are fixed to both ends in the longitudinal direction of the upper surface 200 of the horizontal portion 20 of the aggregate 2. The leading edge of the guide plate 24 protrudes beyond the longitudinal end of the aggregate 2, and a guide receiving portion 25 is formed on the protruding portion. The guide receiving portion 25 consists of a guided groove portion 250 extending in the visible direction and a wide portion 251 located on the inner side of the guided groove portion 250. The guided groove portion 250 is formed by a pair of guide elements, and in this embodiment, the pair of guide elements is a pair of sliding members 26. The sliding members 26 in this embodiment are made of a resin that has a predetermined strength and good sliding properties.

[0025] In this embodiment, the guide plate 24 is fixed to the horizontal portion 20 at its base end, which is roughly rectangular in plan view. A notch 240 with a predetermined width and depth is formed at the tip end. Both sides of the opening of the notch 240 are inclined edges 241 in plan view, so as not to interfere with the lifting paths of the first wire W1 and the second wire W2.

[0026] A pair of sliding members 26 are provided at the opening of the notch 240, facing each other in the depth direction and spaced apart from one another. The sliding members 26 narrow the opening of the notch 240, and the gap between the sliding members 26 forms the guided groove 250. In the notch 240, the portion at the back of the guided groove 250 is a wider portion 251 than the guided groove 250. A pair of fixing members 27 are provided at the opening of the notch 240, and each sliding member 26 is supported by each fixing member 27. As shown in Figure 9, the height dimensions of the sliding members 26 and the fixing members 27 are greater than the thickness of the guide plate 24.

[0027] As shown in Figure 9, the sliding member 26 is a roughly rectangular parallelepiped with a roughly rectangular shape in plan view, and comprises a tip surface 260 that forms the guided groove 250, a base surface 261, an outer depth surface 262, and an inner depth surface 263. The tip surface 260 that forms the guided groove 250 bulges gently in plan view.

[0028] The fixing member 27 is formed from a visible piece 270, an outer recessed piece 271, and an inner recessed piece 272, and has an L-shaped support portion in plan view formed from the visible piece 270 and the outer recessed piece 271. The base end visible surface 261 of the sliding member 26 abuts against the visible piece 270, and the outer recessed surface 262 abuts against the outer recessed piece 271, and the sliding member 26 is detachably attached to the fixing member 27 by fastening it to the outer recessed piece 271 with a screw S1 (Figure 9). The tip of the visible surface 260 protrudes beyond the tip of the outer recessed piece 271 to which the outer recessed surface 262 is attached.

[0029] [B-2] Bottom member As shown in Figure 14, the bottom member 3 has a rectangular parallelepiped shape overall, consisting of a pair of upper frames 30 extending horizontally and parallel in the opening width direction, a pair of lower frames 31 extending horizontally and parallel in the opening width direction, and vertical end plates 32 at both ends. One upper frame 30 and one lower frame 31 are located on the first side in the depth direction, and the other upper frame 30 and one lower frame 31 are located on the second side in the depth direction. The bottom member 3 is equipped with a plurality of inclined reinforcing members 38, forming a truss structure. In this embodiment, the depth of the bottom member 3 is approximately the same as the depth of the structural members 2.

[0030] The upper frame 30 according to this embodiment is a rectangular pipe with a rectangular cross-section, and comprises a vertical side surface (visible surface) 300 and a horizontal top surface 301. The top surfaces 301 of the pair of upper frames 30 form the top surface of the bottom member 3.

[0031] The lower frame 31 is a rectangular pipe with a rectangular cross-section and has vertical side surfaces (face surfaces) 310. The face surfaces 300 of one upper frame 30 and the face surfaces 310 of the lower frame 31 form the first face surface of the bottom member 3, while the other face surfaces 300 of the upper frame 30 and the face surfaces 310 of the lower frame 31 form the second face surface of the bottom member 3.

[0032] On the upper surface 301 of the upper frame 30, protrusions 33 are formed adjacent to the surface to which the lower end portion 23 of the upper structural member 2 abuts, with spacing in the width direction. In this embodiment, the protrusions 33 are provided on the upper surface 301, located on the inside of the surface to which the lower end portion 23 of the structural member 2 abuts. In this embodiment, multiple protrusions 33 are provided on the upper surface 301 of the bottom member 3 with spacing in the width direction, but they may also be elongated members extending in the opening width direction.

[0033] A buffer member 34 is provided at the lower end of the lower frame 31. The buffer member 34 is a long member that extends in the width direction of the bottom member 3 (width direction of the shutter curtain 1), and two buffer members 34 are arranged side by side spaced apart in the depth direction, so that when the opening is fully closed, the buffer member 34 at the lower end of the bottom member 3 is in close contact with the floor surface FL.

[0034] As shown in Figures 17 to 20 and Figure 22, the end plate 32 is a vertically elongated rectangle and forms the left and right projection surfaces of the bottom member 3. A wire fixing portion 35 is provided in the middle of the end plate 32 in the height direction, an upper guided portion 36 is provided on the upper side of the end plate 32, positioned above the wire fixing portion 35, and a lower guided portion 37 is provided on the lower side of the end plate 32, positioned below the wire fixing portion 35. The upper guided portion 36 and the lower guided portion 37 each have a pair of guide elements, and in this embodiment, the upper guided portion 36 has a pair of sliding members 362, and the lower guided portion 37 has a pair of first guide rollers 370 and second guide rollers 371. Since the upper guided portion 36 and the lower guided portion 37 are located on the upper and lower sides of the bottom member 3 in the height direction, the tilting of the bottom member 3 can be suppressed.

[0035] [B-2-1] Wire fixing part As shown in Figures 19, 22, and 23, the wire fixing section 35 according to this embodiment consists of a pair of wire fixing sections 35 arranged side by side in the depth direction. Each wire fixing section 35 consists of a shaft section 350 to which the lower end of the suspension wire W is attached, a support section 351 that supports the shaft section 350, and a base 352 that extends from the end plate 32 and to which the support section 351 is fixed. The upper end of the base 352 is provided with a height adjustment means 353 consisting of a bolt or the like that extends vertically, which adjusts the two suspension wires W connected to the wire fixing section 35 so that there is no slack and the bottom member 3 does not tilt when the wire fixing section 35 is pulled upward.

[0036] [B-2-2] Upper guided part As shown in Figures 18 and 22, the upper guided portion 36 consists of an upper guide plate 361 equipped with a guide receiving portion 360. The upper guide plate 361 extends horizontally from the upper end of the vertical surface portion 3610 fixed to the end plate 32, and the guide receiving portion 360 is formed on the upper guide plate 361. The upper guide plate 361 has a notch 3611 formed on it, similar to the guide plate 24, and a pair of sliding members 362 are provided at the opening of the notch 3611 and spaced apart in the depth direction, with a guided groove formed between the sliding members 362, and the back side of the guided groove in the notch 3611 is a wider portion. The sliding members 362 are fixed to a pair of fixing members 363 provided at the opening of the notch 3611 and spaced apart in the depth direction. The configuration of the guide receiving portion 360 of the bottom member 3 is the same as the configuration of the guide receiving portions 25 at both ends in the longitudinal direction of the structural member 2, and the explanation of the guide receiving portion 25 can be used as needed.

[0037] [B-2-3] Lower guided part As shown in Figures 20 and 22, the lower guided portion 37 consists of a lower guide plate 372 equipped with a pair of first guide rollers 370 and a second guide roller 371 positioned perpendicular to the first guide rollers 370 in a plan view. The lower guide plate 372 extends horizontally from the lower end of the vertical surface portion 3720 fixed to the end plate 32. A notch 3721 is formed in the lower guide plate 372, and a pair of first guide rollers 370 are spaced apart from each other so as to sandwich the opening of the notch 3721 from the depth direction. A guided groove portion narrower than the width of the opening is formed between the circumferential surfaces of the first guide rollers 370 that are facing each other in the depth direction. The second guide roller 371 is provided on the vertical surface portion 3720. Furthermore, since the pair of first guide rollers 370 and second guide rollers 371, which are guide elements of the lower guided portion 37, are located at the lowest point of the shutter curtain 1, they can smoothly accommodate horizontal deviations of the shutter curtain 1 (sheet 4), including the visible direction and depth direction.

[0038] [B-3] Sheet and sheet fixing structure The first sheet 4A and the second sheet 4B have height and width dimensions that allow the opening to be closed. The first sheet 4A and the second sheet 4B are fixed in contact with the visible surface of each structural member 2 and the visible surface of the bottom member 3 when multiple structural members 2 and bottom members 3 are positioned parallel to each other with spacing in the height direction. The upper ends of the first sheet 4A and the second sheet 4B are fixed to the first visible surface 140 and the second visible surface 141 of the upper end member 14. One visible surface and the other visible surface of the structural member 2 and bottom member 3 are flush with the first visible surface 140 and the second visible surface 141 (see Figure 5).

[0039] In this embodiment, multiple structural members 2 and bottom members 3 have the same depth, and the visible surfaces 210 of the contact portion 21 of each structural member 2, the visible surface 300 of the upper frame 30 of the bottom member 3, and the visible surface 310 of the lower frame 31 are located on the same vertical plane. The first sheet 4A and the second sheet 4B are in contact with the visible surfaces 210 of each structural member 2 and the visible surfaces 300 and 310 of the bottom member 3, and are fixed to the visible surfaces 210, 300 and 310 by screws S2 with a sheet pressing member 7 that extends in the sheet width direction (Figures 5, 10 to 13, and 18 to 21).

[0040] As shown in Figure 13, the sheet retaining member 7, in cross-sectional view, consists of a vertical portion 70, an upper inclined portion 71 above the vertical portion 70, and a lower inclined portion 72 below the vertical portion 70. The sheet 4 is placed in contact with the visible surfaces of the frame material 2 and the bottom member 3, with the vertical portion 70 placed on top of the sheet 4, and the sheet 4 is sandwiched between the vertical portion 70 and the visible surfaces, and fixed with multiple screws S2 spaced apart in the opening width direction.

[0041] As shown in Figures 10-12 and 18-21, the visible width dimension of the sheet 4 is greater than the visible width of the frame material 2 and the bottom member 3, and both ends of the sheet 4 in the width direction have extensions 42 that extend beyond both ends of the frame material 2 and the bottom member 3 in the length direction. The width direction edge of the sheet 4 is represented by 4'. The length dimension of the sheet retaining member 7 is longer at its ends than the length dimension of the frame material 2 and the bottom member 3, and both ends of the sheet retaining member 7 in the width direction protrude beyond the width direction ends of the frame material 2 and the bottom member 3, forming extensions 7'. The extensions 42 of the sheet 4 are fixed to the extensions 7' of the sheet retaining member 7. More specifically, the extensions 42 of the sheet 4 are fixed with screws S3 by sandwiching them between a backing plate 73, which acts as a fixing member, and the extensions 7' of the sheet retaining member 7. The shape of the fixing member is not limited, but the backing plate 73 in this embodiment is a thin disc shape.

[0042] The material of the sheet 4 according to this embodiment is not limited as long as it has a predetermined strength and flexibility, and can be formed from known sheet materials. As shown in Figure 35, the sheet 4 according to this embodiment is formed by connecting a plurality of strip-shaped sheets 400 that extend in the height direction in the width direction. Since the connection portion of the strip-shaped sheet 400 extends in the sheet height direction, the influence of the sheet's own weight on the connection portion is smaller compared to when multiple sheets are connected in the height direction (where the connection portion extends horizontally).

[0043] [C] Guide mechanism The guide rails G are fixed to the building structure C at both ends of the opening and extend over approximately the entire height of the opening. As shown in Figures 10, 17A, and 18-20, the guide rails G according to this embodiment consist of a first guide rail 8 located approximately in the center of the depth of the shutter curtain 1 and extending in the visible direction, and a pair of second guide rails 9 located so as to sandwich the first guide rail 8 in a plan view and extending in the visible direction. In this embodiment, the visible lengths of the first guide rail 8 and the second guide rails 9 are the same. The widthwise ends of the shutter curtain 1 are guided by the guide rails G. The first guide rails 8 are received between the guide receiving portions 25 of each structural member 2, the guide receiving portions 360 of the bottom member 3, and a pair of first guide rollers 370, with the widthwise ends of the first sheet 4A located outside one of the second guide rails 9, and the widthwise ends of the second sheet 4B located outside the other second guide rail 9.

[0044] [C-1] First guide rail The first guide rail 8 is located approximately in the center of the depth of the shutter curtain 1, with its base end fixed to the building structure C, and has a guide portion on its leading end in the visible direction. The guide portion of the first guide rail 8 comprises a first portion 80 located approximately in the center of the depth of the shutter curtain 1 and extending in the visible direction, and a second portion 81 extending in the depth direction at the tip of the first portion 80, and in this embodiment has a T shape in plan view. The base end of the first portion 80 is a wide portion 800, and a fixing piece 82 is formed at the base end of the wide portion 800. The first guide rail 8 is attached to the building structure C by fixing the fixing piece 82 to the building structure C with bolts.

[0045] [C-2] Second guide rail (seat guide) The second guide rail 9 is fixed at its base end to the structure C, and its leading end portion in the visible direction is positioned on the visible surfaces of both ends in the width direction of the shutter curtain 1, so as to abut or approach both ends in the width direction of the sheet 4 from the inside. The second guide rail 9 comprises a leading end first visible piece 90, a base end second visible piece 91 located inward in the visible direction relative to the first visible piece 90, and a stepped portion 92 located between the base end of the first visible piece 90 and the leading end of the second visible piece 91. The width direction end of the sheet 4 abuts or approaches the outer surface of the first visible piece 90. A fixing piece 93 extending perpendicularly to the second visible piece 91 is provided at the base end of the second visible piece 91, and the second guide rail 9 as a whole has a roughly L shape in plan view. The pair of second guide rails 9 are positioned so as to sandwich the first guide rail 8 in plan view.

[0046] [C-3] First guide mechanism A first guide mechanism equipped with a first guide rail 8 will be described. Guide receiving portions 25 are provided at both ends in the width direction of the structural member 2, consisting of a guided groove portion 250 extending in the visible direction and a wide portion 251 located behind the guided groove portion 250. A part of the first portion 80 is positioned in the guided groove portion 250 with a clearance, and the second portion 81 is positioned in the wide portion 251. The depth dimension of the second portion 81 is larger than the groove width of the guided groove portion 250 and smaller than the depth width of the wide portion 251, and the second portion 81 can be locked into the guided groove portion 250 (the inner depth surface 263 of the sliding member 26). The sliding member 26 according to this embodiment is made of a resin with good sliding properties, and even when the second portion 81 is in contact with the inner depth surface 263 of the sliding member 26, there is no hindrance to opening and closing the shutter curtain 1.

[0047] At both ends in the width direction of the bottom member 3, a guide receiving portion 360 of the upper guided portion 36 is provided on the upper side, and a pair of first guide rollers 370 of the lower guided portion 37 are provided on the lower side. A part of the first portion 80 is positioned in the guided groove of the upper guide receiving portion 360 with a clearance, and the second portion 81 is positioned in the wider portion. The depth dimension of the second portion 81 is larger than the groove width of the guided groove and smaller than the depth width of the wider portion, and the second portion 81 can be locked into the guided groove (the inner depth surface of the sliding member 362).

[0048] A portion of the first part 80 is positioned with clearance between the pair of first guide rollers 370 of the lower guided portion 37, the depth of the second part 81 is greater than the groove width between the first guide rollers 370, and the inner side surfaces of the first guide rollers 370 and the second part 81 are spaced apart and do not come into contact. The leading edge of the second part 81 is spaced apart from and facing the second guide roller 371, and the second guide roller 371 can slide against the leading edge of the second part 81 in accordance with the widthwise sway of the shutter curtain 1. As shown in Figure 22, the second guide roller 371 is positioned above the pair of first guide rollers 370.

[0049] With the second portion 81 of one of the first guide rails 8 in the width direction of the shutter curtain 1 locked into the guided groove (the inner surface 263 of the sliding member 26 and the inner surface 362), the second portion 81 of the first guide rail 8 on the same side and the side surface of the first guide roller 370 are spaced apart. Furthermore, the tip of the second portion 81 of the other first guide rail 8 in the width direction of the shutter curtain 1 is spaced apart from the bottom 2510 of the wide portion 251 of the guide receiving portion 25 and the bottom of the wide portion of the guide receiving portion 360.

[0050] [C-4] Second guide mechanism A second guide mechanism equipped with a second guide rail 9 will now be described. The widthwise ends of the first sheet 4A are extensions 42 that extend beyond the widthwise ends of the frame material 2 and the bottom member 3. The extension 42 comprises a first portion 420 that abuts against or is close to the first visible piece 90 of one of the second guide rails 9, and a second portion 421 that is spaced apart from and opposite the second visible piece 91. The second portion 421 is fixed to the extension 7' ​​by being sandwiched between the back plate 73 and screws S3 while in contact with the back surface of the extension 7'. The second guide rail 9 is a sheet guide, and the widthwise ends of the first sheet 4A are guided by the first visible piece 90 of the second guide rail 9 located on the back side of the first portion 420 of the widthwise ends of the first sheet 4A.

[0051] The widthwise ends of the second sheet 4B are extensions 42 that extend beyond the widthwise ends of the structural members 2 and the bottom member 3. The extensions 42 include a first portion 420 that abuts against or is close to the first visible piece 90 of the other second guide rail 9, and a second portion 421 that is spaced apart from the second visible piece 91. The second portion 421 is fixed to the extension 7' ​​by being sandwiched between the back plate 73 and screws S3 while in contact with the back surface of the extension 7'. The second guide rail 9 is a sheet guide, and the widthwise ends of the second sheet 4B are guided by the first visible piece 90 of the second guide rail 9 located on the back side of the first portion 420 of the widthwise ends of the second sheet 4B.

[0052] In each second guide rail 9, the projection dimension of the stepped portion 92 of the second guide rail 9 is greater than the projection dimension of the backing plate 73 in plan view (i.e., the thickness of the backing plate 73), and the backing plate 73 located on the back surface of the second portion 421 at both ends in the width direction of the sheet 4 is spaced apart from the second visible piece 91 of the second guide rail 9, thus restricting contact between the backing plate 73 and the second visible piece 91. The backing plate 73, which is spaced apart from the second visible piece 91 of the second guide rail 9, is spaced outward in the visible direction relative to the stepped portion 92 of the second guide rail 9, and even when the second portion 81 is in contact with the inner projection surface 263 of the sliding member 26, contact between the stepped portion 92 of the second guide rail and the backing plate 73 is restricted.

[0053] [D] Lifting drive device The sheet shutter according to this embodiment opens and closes the opening by electrically raising and lowering the shutter curtain 1 using a lifting drive device. The lifting drive device comprises a suspension wire W whose lower end is connected to a bottom member 3, and a winding device 6 provided above the opening and to which the upper end of the suspension wire W is connected. By driving the winding device 6 with an electric motor M, the upper end of the suspension wire W is wound up, causing the suspension wire W to move upward and raise the shutter curtain 1, and by unwinding the upper end of the suspension wire W, the suspension wire W is moved downward and the shutter curtain 1 is lowered.

[0054] As shown in Figure 23, the suspension wire W according to this embodiment is a wire set consisting of two suspension wires W that extend vertically opposite to each other in the depth direction. The lower ends of the first wire set, consisting of two first wires W1, and the second wire set, consisting of two second wires W2, are connected to both ends in the width direction of the bottom member 3 located at the lowest part of the shutter curtain 1. More specifically, the first wires W1 are fixed to each of a pair of wire fixing parts 35 provided on one end plate 32 of the bottom member 3, and the second wires W2 are fixed to each of a pair of wire fixing parts 35 provided on the other end plate 32 of the bottom member 3.

[0055] As shown in Figures 10, 18, and 19, at both ends in the width direction of the shutter curtain 1, a pair of first wires W1 and a pair of second wires W2 extend vertically at positions spaced apart from the guide rails G (first guide rail 8, second guide rail 9), guide plate 24, and upper guide plate 361, respectively, so as not to come into contact with the guide rails G (first guide rail 8, second guide rail 9), guide plate 24, and upper guide plate 361. More specifically, one of the first wires W1 and W2 of the first wire set and the second wire set extends in the space between the first guide rail 8 and the second guide rail 9, respectively, while the other of the first wires W1 and W2 of the first wire set and the second wire set extends in the space between the first guide rail 8 and the other second guide rail 9, respectively. The opening of the notch 240 of the guide plate 24 has a pair of inclined edges 241 on both sides in the depth direction when viewed from above, so as not to interfere with the lifting paths of the two first wires W1 and the two second wires W2. Similar inclined edges are formed on the upper guide plate 361.

[0056] In this embodiment, an upper end member 14 extends in the width direction of the opening above the opening, and two beams H1 and H2 made of H-shaped steel extend parallel to each other in the width direction above it (see Figures 25, 26, and 27). The upper ends of the first wire set (two first wires W1) and the second wire set (two second wires W2), which extend perpendicularly in the height direction of the opening, extend in the height direction through notches 1420 formed at both ends in the longitudinal direction of the bottom surface 142 of the upper end member 14, and through the space between the pair of beams H1 and H2, respectively (see Figure 25).

[0057] Above the opening, a first pulley 5A is positioned directly above one end of the opening in the width direction, and a second pulley 5B is positioned directly above the other end of the opening in the width direction. On the ceiling surface above the opening, a first winding device 6A and a second winding device 6B are positioned directly above the approximate center of the opening in the width direction. The first pulleys 5A and 2B are arranged side by side in the depth direction to form a first pulley set, and the second pulleys 5B are arranged side by side in the depth direction to form a second pulley set.

[0058] As shown in Figures 1 to 3 and Figure 26, the two first wires W1 are wound around the first pulleys 5A of the first pulley set above the opening, extend toward the center of the opening, and are connected to the first winding device 6A, making them windable onto the first winding device 6A. The two first wires W1 are wound onto a common winding drum 60 of the first winding device 6A, with one first wire W1 wound onto one half 61 of the winding drum 60 which extends in the forward direction, and the other first wire W1 wound onto the other half 62.

[0059] As shown in Figures 1 to 3, the two second wires W2 are wound around the second pulleys 5B of the second pulley set above the opening, extend toward the center of the opening, and are connected to the second winding device 6B, making them windable onto the second winding device 6B. The two second wires W2 are wound onto a common winding drum 60 of the second winding device 6B, with one second wire W2 being wound onto one half 61 of the winding drum 60 which extends in the forward direction, and the other second wire W2 being wound onto the other half 62.

[0060] A pair of beams H1 and H2 extend parallel to each other in the width direction of the opening above the opening, and a beam H3 is positioned spaced apart on the indoor side of these beams. Multiple mounting plates P are provided perpendicular to beams H1, H2, and H3, spanning the upper surfaces of the three beams H1, H2, and H3. A pulley 5 is provided on mounting plate P1, which is located above the end of the opening in the width direction. A winding device 6 is provided on mounting plate P2, which is located above the approximate center of the opening in the width direction.

[0061] The two first wires W1 constituting the first wire set are wound onto a common winding drum 60 of the first winding device 6A, and the two second wires W2 constituting the second wire set are wound onto a common winding drum 60 of the second winding device 6B. In this embodiment, the mounting positions of the lower ends of the two first wires W1 of the first wire set and the lower ends of the two second wires W2 of the second wire set are adjustable in the height direction. As shown in Figure 24, the base 352 of the wire fixing part 35 is fixed to the end plate 32 so as to be adjustable in the height direction. More specifically, the end plate 32 has an elongated hole extending in the height direction, and the height position of the wire fixing part 35 is adjusted by a height adjustment means 353 located above the base 352 as needed, and then fixed to the end plate 32 with a screw S4.

[0062] [E] Shutter opening and closing operation The sheet shutter according to this embodiment is electrically opened and closed by a winding device 6 driven by a motor M. When opening the opening, the first wire W1 and the second wire W2 are wound onto the winding drums 60 of the first winding device 6A and the second winding device 6B, respectively. As a result, the shutter curtain 1 rises with multiple frame members 2 and bottom members 3 overlapping in the height direction, and the sheets 4A and 4B are folded outwards on the first and second sides respectively, resulting in a fully open opening (see Figures 2, 6, and 7).

[0063] When the shutter curtain 1 is raised, the upper end (upper surface 301) of the bottom member 3 abuts against the lower end 23 of the frame member 2, and in adjacent frame members 2, the upper end 22 of the lower frame member 2 abuts against the lower end 23 of the upper frame member 2. The upper surface 301 of the upper frame 30 of the bottom member 3, which moves upward due to the upward movement of the suspension wire W, abuts against the horizontal surface 230 of the lower end 23 of the lowest frame member 2, causing the frame member 2 to move upward, and the horizontal surface 220 of the upper end 22 of the frame member 2 abuts against the horizontal surface 230 of the lower end 23 of the frame member 2 located above it, causing the frame member 2 to move upward.

[0064] As shown in Figure 34, when the bottom member 3 and the structural members 2 are superimposed, the protrusions 33 on the upper surface 301 of the bottom member 3 are located inside the downward-facing protrusions 23 of the lower end portions 23 of the structural members 2 located on both sides in the depth direction. In this embodiment, the height of the protrusions 33 is lower than the height of the downward-facing protrusions of the lower end portions 23, and the portions that are spaced apart from the vertical surface 232 on the inside of the downward-facing protrusions are the lower vertical surface 330 and the upper inclined surface 331. When the shutter curtain 1 moves upward (when the shutter curtain 1 is pulled up), if the bottom member 3 and the upper structural members 2 are spaced apart and shift in the depth direction, the inclined surface 331 of one of the protrusions 33 contacts the corner between the vertical surface 232 on the inside of the downward-facing protrusion and the horizontal surface 230, thereby restricting the shift. If the bottom member 3 and the upper structural member 2 are in contact and shift in the depth direction, the vertical surface 330 of one of the protrusions 33 will come into contact with the inner vertical surface 232 of the other downward-facing protrusion, thereby restricting the shift.

[0065] As shown in Figure 34, when the aggregates 2 are superimposed on each other, the horizontal surface 220 of the recess of the upper end 22 of the lower aggregate 2 abuts against the horizontal surface 230 of the convex portion of the lower end 23 of the upper aggregate 2, the inclined surface 2210 of the recess of the upper end 22 of the lower aggregate 2 is close to or abuts against the inclined surface 231 of the convex portion of the lower end 23 of the upper aggregate 2, the inner vertical surface 232 of the downward convex portion of the lower end 23 of the upper aggregate 2 faces the inner side surface of the convex portion 222 inside the recess of the upper end 22 of the lower aggregate 2, and the upper end of the convex portion 222 faces the inner horizontal surface 233. When the shutter curtain 1 is moving upward (when the shutter curtain 1 is being pulled up), if the upper and lower structural members 2 are separated and shift in the depth direction, or if the upper and lower structural members 2 are in contact and shift in the depth direction, one of the protrusions 232 will come into contact with the other inner protrusion 222, and the other inclined surface 2210 will come into contact with the inclined surface 231, thereby restricting the shift.

[0066] When the shutter curtain 1 is raised, if it reaches a predetermined upper limit position, the upper limit switch LSU is activated and the electric raising stops. In the shutter curtain 1, the upper surface 200 of the horizontal portion 20 of the uppermost frame member 2 is provided with contact portions 2000 consisting of protrusions spaced apart in the direction of the opening width. The upper end member 14 located above the opening has a first visible surface 140, a second visible surface 141, and a U-shaped portion in cross-section extending from the bottom surface 142. An upper limit switch LSU is provided inside the upper end member 14 at a distance in the direction of the opening width, and the detection lever of the upper limit switch LSU protrudes downward from the bottom surface 142 of the upper end member 14.

[0067] When the uppermost structural member 2 rises to its upper limit position by winding up the suspension wire W by the winding device 6, the contact portion 2000 of the uppermost structural member 2 contacts the detection lever from below, activating the upper limit switch LSU and stopping the motor M that drives the winding device. When the opening is fully open, the upper limit switch is in the OFF position. Furthermore, an emergency switch EMS is provided inside the upper end member 14 at a distance in the direction of the opening width, and the detection portion of the emergency switch EMS protrudes downward from the bottom surface 142 of the upper end member 14. The detection portion of the emergency switch EMS is located above the detection lever of the upper limit switch LSU.

[0068] When closing the opening, the first wire W1 and the second wire W2 are unwound from the winding drums 60 of the first winding device 6A and the second winding device 6B, respectively. As a result, the shutter curtain 1 descends with the frame 2 and bottom member 3 separated in the height direction, the sheets 4A and 4B extend vertically in the height direction, and the buffer member 34 at the lower end of the bottom member 3 touches the ground, resulting in a fully closed opening (see Figures 1, 4, and 5). When the shutter curtain 1 is rising, if it reaches a predetermined upper limit position, the upper limit switch LSU is activated and the electric upward movement stops. A lower limit switch LSD is provided at the lower end of the guide rail G to detect when the shutter curtain 1 is in the fully closed position. When the opening is fully closed, the lower limit switch LSD is in the OFF position. A detection unit 39 that contacts the lower limit switch LSD is provided at the lower end of the end plate 32 of the bottom member 3 (Figures 15 and 33).

[0069] [F] Bottom lock mechanism The sheet shutter according to this embodiment is equipped with a bottom lock mechanism that prevents the shutter curtain 1 from lifting up when the opening is fully closed. The bottom lock mechanism will be described with reference to Figures 16 and 30 to 33. The bottom lock mechanism consists of a locking device 15 provided at the lower end of the guide rail G and locking receiving parts 16 provided at both ends in the width direction of the bottom member 3. The locking device is provided at the lower end of the guide rail G and is equipped with a locking part 150 that can take an unlocked position and a locked position. When the opening is fully closed, the locking part in the locked position locks into the locking receiving parts, thereby restricting the lifting of the shutter curtain.

[0070] In this embodiment, the locking receiver 16 is fixed to the outdoor side in the depth direction of the lower portion of the end plate 32 of the bottom member 3, and comprises a horizontal locking surface 160 and a contact portion 161 formed on the locking surface 160. By positioning the locking portion (locking receiver 16 and locking portion 150) of the bottom lock mechanism on the outdoor side, it is effective in preventing lifting from the outside.

[0071] The locking device 15 includes a locking portion 150 that is movable between an unlocked position and a locked position, and the locking portion 150 is configured to selectively take on a locked position and an unlocked position in conjunction with the rotational operation of the operating portion 151. When the locking portion 150 is in the locked position, the block-shaped locking portion 150 is positioned directly above the locking surface 160 of the locking receiving portion 16, and when the bottom member 3 at the lower end of the shutter curtain 1, which is in the fully closed position of the opening, is lifted, the locking surface 160 of the locking receiving portion 16 comes into contact with the lower surface of the locking portion 150 from below, restricting the upward movement of the bottom member 3.

[0072] In this embodiment, the locking portion 150 is slidable between upper and lower guides 1500 and 1501 fixed to the building structure C. The operating portion 151 is rotatable between a first position and a second position. By rotating the operating portion 151 from the first position to the second position, the locking portion 150 moves from an unlocked position to a locked position, and by rotating the operating portion 151 from the second position to the first position, the locking portion 150 moves from an unlocked position to an unlocked position.

[0073] The operating section 151 and the locking section 150 are interlocked via a horizontally extending shaft section 152 and a link 153 that extends roughly vertically. When the operating section 151 is in the first position, the lower end of the link 153 is pushed inward in the visible direction and the upper end of the link 153 is pulled outward in the visible direction, causing the locking section 150 to be in the unlocked position. When the operating section 151 is in the second position, the lower end of the link 153 moves outward in the visible direction and the upper end of the link 153 is pushed inward in the visible direction, causing the locking section 150 to be in the locked position. As the link 153 rotates, the part of the link 153 switches the detection switch MS ON / OFF.

[0074] In this embodiment, the locking receiver 16 is located on the outside in the depth direction of the bottom member 3, the locking portion 150 is located on the outside in the depth direction of the guide rail G, and the operating portion 151 is located on the inside (inner visible surface) of the guide rail G in the depth direction. More specifically, the operating portion 151 is located on the outside of the second visible piece 91 of the indoor second guide rail 9, the shaft portion 152 penetrates the wide portion 800 of the indoor second guide rail 9 and the first guide rail 8 and is connected to a link 153 located on the inside of the outdoor second guide rail 9, and the locking portion 150 is located on the inside of the outdoor second guide rail 9 and is slidable in the visible direction along the guides 1500 and 1501.

[0075] In this embodiment, the locking portion 150 is biased to a locked position by a spring 154, and when the locking portion 150 is in the unlocked position, the spring 154 is compressed. When the locking portion 150 slides to the locked position, the tip surface of the locking portion 150 comes into contact with a contact portion 161 formed on the locking surface 160 of the locking receiving portion 16, thereby positioning the locking surface 160 in the locked position. The locking device 15 is equipped with means for maintaining the unlocked position of the locking portion 150, and in this embodiment, the rotation of the shaft portion 152 is restricted by locking a locking pin 155 to a locking portion provided on the circumferential surface of the shaft portion 152 (there is a through hole in the second guide rail 9 on the indoor side). Normally, the locking pin 155 is in the locked state, and the rotational operation of the operating portion 151 is restricted.

[0076] The locking device 15 is equipped with a detection switch MS that detects when the locking device 15 is in a locked state. When the locking portion 150 is in the locked position, that is, when the locking device 15 is in a locked state, the detection switch MS is in the OFF state, and when the detection switch MS is in the OFF state, the electric opening and closing of the shutter curtain 1 is disabled.

[0077] The locking device 15 according to this embodiment is operated by manual operation (rotation of the operating unit 151), but the locking device 15 may also be operated electrically. Specifically, provided that the opening is fully closed (the lower limit switch LSD is in the OFF state), the locking part is moved from the unlocked position to the locked position in response to a lock signal input from the control unit to achieve the locked state. The lock signal input may be transmitted by manual switch operation, or a timer may be activated after the lower limit switch LSD is in the OFF state to transmit the lock signal after a predetermined time. As a means of moving the locking part, for example, a method may be employed in which the locking part is biased in the locking direction by a spring, the extension of the spring which is in a compressed state in the unlocked position is restricted and the restriction is released by the lock signal, or the locking part is moved by a solenoid in response to the input of the lock signal.

[0078] [II] Second Embodiment [A] Overall configuration The overall configuration of the sheet shutter according to the second embodiment will be described with reference to Figures 36 to 44. The sheet shutter according to the second embodiment, like the sheet shutter according to the first embodiment, includes a shutter curtain 1' for opening and closing the opening, guide rails G for guiding both ends of the shutter curtain 1' in the width direction in the height direction, and a lifting and lowering drive device for the shutter curtain 1'. Similar to the first embodiment, a pair of beams H1 and H2 are located above the opening and extend in the width direction of the opening, and the upper end of the opening is formed by an upper end member 14 with a dish-shaped cross-section that extends in the width direction of the opening so as to span the lower ends of the pair of beams H1 and H2. The lower end of the opening is defined by the floor surface FL. The shape of the opening according to the second embodiment is different from the shape of the opening in the first embodiment, as will be clear from the following description.

[0079] The shutter curtain 1' according to the second embodiment consists of a wide upper portion 10, a narrow lower portion 11, and an intermediate portion 12 located below the upper portion 10 and at the same height as the upper portion of the lower portion 11. The visible width dimension of the intermediate portion 12 according to this embodiment is greater than the visible width dimension of the lower portion 11 and smaller than the visible width dimension of the upper portion 10. In the illustrated configuration, the narrow lower portion 11 is positioned towards the first side with respect to the center in the width direction of the wide upper portion 10.

[0080] The sheet 4 according to the second embodiment consists of an upper wide sheet 40 and a lower narrow sheet 41. The upper part 10 of the shutter curtain 1' consists of a plurality of long ribs extending in the opening width direction and a wide sheet 40 provided on the plurality of long ribs, and the height dimension is variable by taking an extended state in which the long ribs are spaced apart in the height direction and a folded state in which the long ribs are overlapped in the height direction. In the upper part 10, the plurality of long ribs consists of a plurality of ribs 2' and a bottom member 13 located at the lowest part of the upper part 10.

[0081] The lower section 11 consists of multiple short structural members extending in the opening width direction and narrow sheets 41 provided on the multiple short structural members, and its height is variable by taking an extended state in which the short structural members are spaced apart in the height direction and a folded state in which the short structural members are overlapped in the height direction. In the lower section 11, the multiple short structural members consist of multiple structural members 2'' and a bottom member 3'' located at the lowest part of the lower section 11 (i.e., the shutter curtain 1'').

[0082] The sheets according to this embodiment (wide sheet 40 and narrow sheet 41) consist of a first sheet 4A' that forms the first visible surface on the first side of the shutter curtain 1' and a second sheet 4B' that forms the second visible surface on the second side of the shutter curtain 1'. When the opening is fully closed, the two sheets 4A' and 4B' are spaced apart and facing each other in the depth direction. The frame members 2', 2'' and the bottom members 3', 13 and the upper end member 14 have a predetermined same depth width. The first sheet 4A' is fixed to the first side in the depth direction of the upper end member 14, frame member 2', bottom member 13, frame member 2'', and bottom member 3', and the second sheet 4B' is fixed to the second side in the depth direction of the upper end member 14, frame member 2', bottom member 13, frame member 2'', and bottom member 3'. In the second embodiment, the wide sheet 40 and the narrow sheet 41 are formed from common sheets 4A' and 4B'.

[0083] The bottom member 13 of the upper part 10 comprises a first part 13A located directly above the structural member 2'' of the lower part 11, a second part 13B located on the first side of the first part 13A in the visible width direction (length direction), and a third part 13C located on the second side of the first part 13A in the visible width direction (length direction). A first intermediate part 12A is provided below the second part 13B of the bottom member 13 of the upper part 10, and a second intermediate part 12B is provided below the third part 13C of the bottom member 13. The intermediate parts 12 (first intermediate part 12A, second intermediate part 12B) are located to the sides of the upper part of the lower part 11. The intermediate part 12 is a panel body formed by joining multiple square pipes in a frame-like manner, and its height dimension is constant.

[0084] The opening opened and closed by the sheet shutter 1' according to the second embodiment consists of a wide upper opening, a narrow lower opening, and an intermediate opening located between the upper and lower openings, which is narrower than the upper opening and wider than the lower opening. The upper end of the opening (upper opening) is defined by the upper end member 14, and the lower end of the opening (lower opening) is defined by the floor surface FL.

[0085] The widthwise ends of the upper opening are defined by the upper guide rail G1, and the widthwise ends of the lower opening are defined by the lower guide rail G2. The widthwise ends of the intermediate opening are defined by the intermediate side wall C1. At the lower end of the upper opening, the portion located outside the widthwise ends of the intermediate opening is the upper floor surface FL1. At the lower end of the intermediate opening, the portion located outside the widthwise ends of the lower opening is the intermediate floor surface FL2.

[0086] When the opening is closed, the wide upper portion 10 of the shutter curtain 1' is located in the wide upper opening, the upper portion of the intermediate portion 12 and the narrow lower portion 11 is located in the intermediate opening, and the remaining portion of the lower portion 11 is located in the narrow lower opening. In this embodiment, the intermediate portion 12 consists of a first intermediate portion 12A and a second intermediate portion 12B, and the space between the first intermediate portion 12A and the second intermediate portion 12B corresponds to the visible width dimension of the lower portion 11. An intermediate guide rail G3 is provided on the portion facing the space between the first intermediate portion 12A and the second intermediate portion 12B, positioned directly above the lower guide rail G2.

[0087] At both ends in the width direction of the bottom member 3' located at the lowest part of the shutter curtain 1', the lower ends of a first wire set consisting of two first wires W1 and a second wire set consisting of two second wires W2 are connected, respectively. The first wires W1 extend vertically along the first side in the width direction of the lower part 11, and are further inserted through the upper part 10 in the height direction, wound around the first pulley set 5A above the opening, and connected to the first winding device 6A provided above the opening. The second wires W2 extend vertically along the second side in the width direction of the lower part 11, and are further inserted through the upper part 10 in the height direction, wound around the second pulley set 5B above the opening, and connected to the second winding device 6B provided above the opening.

[0088] A third wire set consisting of two third wires W3 is connected to the second longitudinal side of the bottom member 13 of the upper part 10 (opposite the first side to which the lower part 11 is located). The third wires W3 are wound around the third pulley set 5C above the opening and connected to the third winding device 6C provided above the opening. The upper ends of the third wire set (two third wires W3) extend in the height direction through a notch 1420 formed at the second longitudinal end of the bottom surface 142 of the upper end member 14, and through the space between the pair of beams H1 and H2 (see Figure 60).

[0089] In other words, the sheet shutter according to the second embodiment opens and closes the opening by electrically raising and lowering the shutter curtain 1' using a lifting drive device. The lifting drive device includes a first wire set (two first wires W1) and a second wire set (two second wires W2) whose lower ends are connected to both ends of the bottom member 3' of the lower part 11, a third wire set (two third wires W3) whose lower end is provided at one end in the width direction of the bottom member 13 of the upper part 10, a first pulley set (two first pulleys 5A) around which the two first wires W1 are wound above the opening, a second pulley set (two second pulleys 5B) around which the two second wires W2 are wound, a third pulley set (two third pulleys 5C) around which the two third wires W3 are wound, a first winding device 6A capable of winding and unwinding the two first wires W1, a second winding device 6B capable of winding and unwinding the two second wires W2, and a third winding device 6C capable of winding and unwinding the two third wires W3.

[0090] When the opening is closed, the first winding device 6A, the second winding device 6B, and the third winding device 6C extend the first wire W1, the second wire W2, and the third wire W3, causing the shutter curtain 1' to extend with the bottom member 3', frame members 2'', bottom member 13, and frame members 2' separated in the height direction, and the sheets 4A' and 4B' extended vertically in the height direction. When the opening is fully closed, the lower limit switch LSD is in the OFF position.

[0091] The sheet shutter according to the second embodiment, like the sheet shutter according to the first embodiment, is equipped with a bottom lock mechanism to prevent the shutter curtain 1' from lifting up when the opening is fully closed. The bottom lock mechanism consists of a locking device 15 provided at the lower end of the lower guide rail G2 and locking receiving parts 16 provided at both ends in the width direction of the bottom member 3'. The locking device is provided at the lower end of the lower guide rail G2 and consists of a locking part that can take both an unlocked position and a locked position. When the opening is fully closed, the locking part in the locked position engages with the locking receiving parts, thereby restricting the lifting of the shutter curtain 1'. Details of the bottom lock mechanism can be found by referring to the description in the first embodiment.

[0092] When the opening is opened, the first winding device 6A, the second winding device 6B, and the third winding device 6C wind up the first wire W1, the second wire W2, and the third wire W3, so that the shutter curtain 1' is folded, with the bottom member 3', frame members 2'', bottom member 13, and frame members 2' overlapping in the height direction, and the sheets 4A' and 4B' folded on the first and second sides, respectively. When the shutter curtain 1' is raised, if it reaches a predetermined upper limit position, the upper limit switch LSU is activated and the electric raising stops. A lower limit switch LSD is provided at the lower end of the lower guide rail G2 to detect when the shutter curtain 1' is in the fully closed position.

[0093] [B] Shutter curtain [B-1] Overall shape The shutter curtain 1' according to the second embodiment consists of a wide upper portion 10, a narrow lower portion 11, and an intermediate portion 12 that is fixed below the upper portion 10 and at the same height as the upper portion of the lower portion 11. The configuration of the shutter curtain 1' according to the second embodiment has many parts in common with the configuration of the shutter curtain 1 according to the first embodiment, and it should be noted that the description of the first embodiment can be referenced or considered as needed. In the shutter curtain 1' according to this embodiment, the frame members 2', 2'' and the sheet retaining member 7 are formed from aluminum profiles, but they may also be made of steel or stainless steel. In the components of the shutter curtain 1', elements other than the frame members 2', 2'' and the sheet retaining member 7 (excluding sliding members) are formed from steel or the like.

[0094] The upper section 10 consists of multiple long structural members 2' extending in the direction of the opening width, a bottom member 13 (upper bottom) provided below the lowest structural member 2', and a wide sheet 40 provided on the multiple long structural members 2' and the bottom member 13. The uppermost structural member 2' of the upper section 10 is located at the upper end of the shutter curtain 1' and has a contact portion that contacts the upper limit switch LSU and the emergency switch EMS (see Figure 60).

[0095] The lower section 11 consists of a plurality of short structural members 2'' extending in the direction of the opening width, a bottom member 3'' (lower bottom) provided below the lowest structural member 2'', and a narrow sheet 41 provided on the plurality of short structural members 2'' and the bottom member 3''. The lowest bottom member 3'' of the lower section 11 is located at the lower end of the shutter curtain 1'' and has a contact portion with a lower limit switch LSD provided at the lower end of the lower guide rail G2.

[0096] The intermediate section 12 consists of a first intermediate section 12A, which is provided at the lower end of the upper section 10 adjacent to the first side in the visible width direction of the upper section of the lower section 11, and a second intermediate section 12B, which is provided at the lower end of the upper section 10 adjacent to the second side in the visible width direction of the upper section of the lower section 11. The distance between the first intermediate section 12A and the second intermediate section 12B corresponds to the visible width dimension of the lower section 11, and an intermediate guide rail G3 is provided on the opposing visible surfaces of the first intermediate section 12A and the second intermediate section 12B, extending in the height direction to guide both ends of the lower section 11 in the width direction. Details of the configuration of the intermediate section 12 will be described later.

[0097] [B-2] Aggregate The structure of the upper part 10' and the lower part 11's structure of the lower part 11 is the same as the structure of the structure 2 according to the first embodiment, except for the length dimension, and the description of the structure 2, including the reference numbers, can be appropriately referred to, for example, Figure 8. Specifically, the structure 2' and 2'' consists of a horizontal part 20 having a predetermined depth and extending in the opening width direction (visible direction), and contact parts 21, 21 provided at both ends of the horizontal part in the depth direction and extending in the opening width direction, the height dimension of the contact part 21 is greater than the height (thickness) of the horizontal part 20, the upper end 22 of the contact part 21 is located above the upper surface 200 of the horizontal part 20, and the lower end 23 of the contact part 21 is located below the lower surface 201 of the horizontal part 20. The contact portions 21, 21 are provided with a vertical surface, which is a visible surface 210, and the first sheet 4A' and the second sheet 4B' are fixed in contact with the visible surface 210, respectively.

[0098] In this embodiment, the upper end portions 22 of the aggregates 2' and 2'' are recessed, and the recess consists of a horizontal surface 220 that forms the bottom surface of the recess, an outer convex portion 221 located outside the horizontal surface 220 and having an inclined surface 2210, and a convex portion 222 located inside the horizontal surface 220. The lower end portions 23 of the aggregates 2' and 2'' are downward convex portions, and the convex portion consists of a horizontal surface 230 that forms the lower end surface of the convex portion, an outer inclined surface 231, an inner vertical surface 232, and an inner horizontal surface 233. When vertically adjacent aggregates 2' and 2'' are superimposed, the recess of the upper end portion 22 of the lower aggregates 2' and 2'' fits into the convex portion of the lower end portion 23 of the upper aggregates 2' and 2''.

[0099] Horizontal guide plates 24 are fixed to both ends in the longitudinal direction of the upper surface 200 of the horizontal portion 20 of the aggregate material 2', 2''. The leading edge of the guide plate 24 protrudes beyond the longitudinal end of the aggregate material 2', 2'', and a guide receiving portion 25 is formed on the protruding portion. The guide receiving portion 25 consists of a guided groove portion 250 extending in the visible direction and a wide portion 251 located behind the guided groove portion 250. For specific details of the configuration of the guide plate 24 and the guide receiving portion 25, refer to the description of the guide plate 24 and the guide receiving portion 25 in the first embodiment.

[0100] The upper part 10's structural member 2' differs from the structural member 2 according to the first embodiment in that it has insertion parts through which the two first wires W1 of the first wire set and the two second wires W2 of the second wire set are inserted in the height direction. As shown in Figure 49, the horizontal part 20 of each structural member 2' has four openings 202 located in the vertical path of the two first wires W1 and the two second wires W2, and the two first wires W1 and the two second wires W2 each pass through the openings 202 and extend in the height direction of the upper part 10. Furthermore, as shown in Figure 60, the bottom surface 142 of the upper end member 14 also has four openings 1400 located in the vertical path of the two first wires W1 and the two second wires W2, and the two first wires W1 and the two second wires W2 each pass through the openings 1400 and extend upwards above the openings.

[0101] [B-3] Bottom member [B-3-1] Lower bottom The configuration of the bottom member 3' of the lower portion 11 is the same as the configuration of the bottom member 3 of the shutter curtain 1 according to the first embodiment, and the description of the bottom member 3, including the reference numbers, can be appropriately referred to, for example, Figures 14 to 23. Specifically, the bottom member 3' has a rectangular parallelepiped shape as a whole, consisting of a pair of upper frames 30 extending horizontally and parallel in the opening width direction, a pair of lower frames 31 extending horizontally and parallel in the opening width direction, and vertical end plates 32 at both ends. One upper frame 30 and one lower frame 31 are located on the first side in the depth direction, and the other upper frame 30 and one lower frame 31 are located on the second side in the depth direction. The bottom member 3' has a truss structure, comprising a plurality of inclined reinforcing members 38.

[0102] The upper frame 30 according to this embodiment is a rectangular pipe with a rectangular cross-section, and has a vertical side surface (visible surface) 300 and a horizontal top surface 301. The top surfaces 301 of the pair of upper frames 30 form the top surface of the bottom member 3'. The lower frame 31 is a rectangular pipe with a rectangular cross-section, and has a vertical side surface (visible surface) 310. The visible surface 300 of one upper frame 30 and the visible surface 310 of the lower frame 31 form the first visible surface of the bottom member 3', and the visible surface 300 of the other upper frame 30 and the visible surface 310 of the lower frame 31 form the second visible surface of the bottom member 3'.

[0103] On the upper surface 301 of the upper frame 30, protrusions 33 are formed adjacent to the surface to which the lower end portion 23 of the upper structural member 2'' abuts, with spacing in the width direction. In this embodiment, the protrusions 33 are provided on the upper surface 301, located on the inside of the surface to which the lower end portion 23 of the structural member 2'' abuts. In this embodiment, multiple protrusions 33 are provided on the upper surface 301 of the bottom member 3'' with spacing in the width direction, but they may also be elongated members extending in the opening width direction.

[0104] A buffer member 34 is provided at the lower end of the lower frame 31. The buffer member 34 is a long member that extends in the width direction of the bottom member 3' (the width direction of the shutter curtain 1'), and two buffer members 34 are arranged side by side spaced apart in the depth direction, so that when the opening is fully closed, the buffer member 34 at the lower end of the bottom member 3' is in close contact with the floor surface FL.

[0105] The end plate 32 is a vertically elongated rectangle and forms the left and right projection surfaces of the bottom member 3'. A wire fixing portion 35 is provided in the middle of the end plate 32 in the height direction, an upper guided portion 36 is provided on the upper side of the end plate 32, located above the wire fixing portion 35, and a lower guided portion 37 is provided on the lower side of the end plate 32, located below the wire fixing portion 35. The upper guided portion 36 and the lower guided portion 37 each have a pair of guide elements, and in this embodiment, the upper guided portion 36 has a pair of sliding members 362, and the lower guided portion 37 has a pair of first guide rollers 370 and second guide rollers 371.

[0106] [B-3-2] Upper bottom As shown in Figures 50 and 51, the bottom member 13 of the upper portion 10 consists of a first portion 13A located directly above the structural member 2'' of the lower portion 11, a second portion 13B located on the first side of the first portion 13A in the visible width direction (length direction), and a third portion 13C located on the second side of the first portion 13A in the visible width direction (length direction). In this embodiment, the third portion 13C is formed by connecting a plurality of short elements via end plates 132. One end of the first portion 13A and one end of the second portion 13B are connected via a first joint portion 13D, and the other end of the first portion 13A and one end of the third portion 13C are connected via a second joint portion 13E. The first joint section 13D is located in the lifting path of the first wire set (two first wires W1), and the second joint section 13E is located in the lifting path of the second wire set (two second wires W2).

[0107] As shown in Figures 52 and 53, the bottom member 13 has a rectangular parallelepiped shape overall, comprising a pair of upper frames 130 extending horizontally and parallel in the opening width direction, a pair of lower frames 131 extending horizontally and parallel in the opening width direction, and end plates 132 at both ends (the other end of the second section 13B and the other end of the third section 13C). One upper frame 130 and one lower frame 131 are located on the first side in the depth direction, and the other upper frame 130 and one lower frame 131 are located on the second side in the depth direction. The first section 13A, the second section 13B, and the third section 13C of the bottom member 13 are equipped with a plurality of inclined reinforcing members 139, forming a truss structure. In this embodiment, the visible width of the first portion 13A of the bottom member 13 is approximately the same as the visible width of the bottom member 3', and no reinforcing material 139 is provided inside the first joint portion 13D and the second joint portion 13E located at both ends of the first portion 13A, and sufficient space (wire insertion portion) is formed for inserting the suspension wire W in the height direction.

[0108] The upper frame 130 according to this embodiment is a rectangular pipe with a rectangular cross-section, and has a vertical side surface (visible surface) 1300 and a horizontal top surface 1301. The top surfaces 1301 of the pair of upper frames 130 form the top surface of the bottom member 13. The lower frame 131 is a rectangular pipe with a rectangular cross-section, and has a vertical side surface (visible surface) 1310. The visible surface 1300 of one upper frame 130 and the visible surface 1310 of the lower frame 131 form the first visible surface of the bottom member 13, and the visible surface 1300 of the other upper frame 130 and the visible surface 1310 of the lower frame 131 form the second visible surface of the bottom member 13.

[0109] On the upper surface 1301 of the upper frame 130, protrusions 133 are formed adjacent to the surface to which the lower end portion 23 of the upper structural member 2' abuts, with spacing in the width direction. In this embodiment, the protrusions 133 are provided on the upper surface 1301, located on the inside of the surface to which the lower end portion 23 of the structural member 2' abuts. In this embodiment, multiple protrusions 133 are provided on the upper surface 1301 of the bottom member 13 with spacing in the width direction, but they may also be elongated members extending in the opening width direction.

[0110] On the lower surface 1311 of the lower frame 131, protrusions 134 are formed adjacent to the surface to which the upper end 22 of the lower structural member 2'' abuts, with spacing in the width direction (see Figure 61). In this embodiment, the protrusions 134 are provided on the lower surface 1311, located on the inside of the surface to which the upper end 22 of the structural member 2'' abuts. In this embodiment, multiple protrusions 134 are provided on the lower surface 1311 of the bottom member 13 with spacing in the width direction, but they may also be elongated members extending in the opening width direction.

[0111] The end plate 132 is a vertical rectangular plate and forms the left and right projection surfaces of the bottom member 13. The second end plate 132 in the longitudinal direction (visible width direction) of the bottom member 13 is provided with a wire fixing portion 135 located midway in the height direction. Both end plates 132 are provided with an upper guide portion 136 and a lower guide portion 137, and a guide roller 138 is provided as an intermediate guide portion midway in the height direction, located between the upper guide portion 136 and the lower guide portion 137. On the second end plate 132, the guide roller 138 is located between a pair of wire fixing portions 135.

[0112] The wire fixing portion 135 according to this embodiment consists of a pair of wire fixing portions 135 arranged side by side in the depth direction. The lower end of the third wire W3 is attached to each wire fixing portion 135. The wire fixing portion 135 is fixed to the end plate 132 so as to be adjustable in the height direction. More specifically, the end plate 132 has an elongated hole extending in the height direction, and the height position of the wire fixing portion 135 can be adjusted as needed by the height adjustment means 1353 (see Figure 53). For the specific configuration of the wire fixing portion 135, refer to the description of the wire fixing portion 35 in the first embodiment.

[0113] The upper guided portion 136 and the lower guided portion 137 have the same configuration as the upper guided portion 36 of the bottom member 3 according to the first embodiment, and the description of the upper guided portion 36 can be referenced as needed. Furthermore, the configuration of the guide receiving portions of the upper guided portion 136 and the lower guided portion 137 is the same as the configuration of the guide receiving portions 25 at both ends in the longitudinal direction of the aggregate 2, and the description of the guide receiving portion 25 (which comprises a pair of sliding members 26 and a pair of fixing members 27) can be referenced as needed. For the guide roller 138, the description of the second guide roller 371 in the first embodiment can be referenced.

[0114] [B-4] Sheet and sheet fixing structure In this embodiment, the upper end member 14, multiple structural members 2', bottom member 13, multiple structural members 2'', and bottom member 3' have the same depth, and the first sheet 4A' and the second sheet 4B' are fixed by a sheet retaining member 7 extending in the sheet width direction with screws S2, while in contact with the first visible surface 140 and the second visible surface 141 of the upper end member 14, the visible surfaces 210 of each structural member 2' and 2'', the visible surfaces 300 and 310 of the bottom member 3', and the visible surfaces 1300 and 1310 of the bottom member 13. The fixing structure at both ends in the sheet width direction is substantially the same as the fixing structure at both ends in the width direction of the sheet 4 according to the first embodiment, and the specific configuration can be referred to in the description of the first embodiment.

[0115] The visible width dimension of the wide sheet 40 is greater than the visible width of the frame material 2' and the bottom member 13, and both ends of the wide sheet 40 in the width direction have extensions 42 that extend beyond both ends of the frame material 2' and the bottom member 13 in the length direction. The length dimension of the sheet retaining member 7 that fixes the wide sheet 40 is longer at its ends than the length dimension of the frame material 2' and the bottom member 13, and both ends of the sheet retaining member 7 in the width direction protrude beyond the ends of the frame material 2' and the bottom member 13 in the width direction, forming extensions 7'. The extensions 42 of the sheet 4 are fixed to the extensions 7' of the sheet retaining member 7. More specifically, the extensions 42 of the sheet 4 are fixed with screws S3 by sandwiching them between the backing plate 73, which is a fixing member, and the extensions 7' of the sheet retaining member 7.

[0116] The visible width of the narrow sheet 41 is greater than the visible width of the frame members 2'' and the bottom member 3'', and both ends of the narrow sheet 41 in the width direction have extensions 42 that extend beyond both ends of the frame members 2'' and the bottom member 3'' in the length direction. The length of the sheet retaining member 7 that fixes the narrow sheet 41 is longer at its ends than the length of the frame members 2'' and the bottom member 3'', and both ends of the sheet retaining member 7 in the width direction protrude beyond the ends of the frame members 2'' and the bottom member 3'' in the width direction, forming extensions 7''. The extensions 42 of the sheet 4 are fixed to the extensions 7'' of the sheet retaining member 7. More specifically, the extensions 42 of the sheet 4 are fixed with screws S3 by sandwiching them between the backing plate 73, which acts as a fixing member, and the extensions 7'' of the sheet retaining member 7.

[0117] The material of the sheet 4 according to this embodiment is not limited as long as it has predetermined strength and flexibility, and can be formed from known sheet materials. As shown in Figure 62, the sheet 4 according to this embodiment is formed by connecting a plurality of strip-shaped sheets extending in the height direction in the width direction. Specifically, the plurality of strip-shaped sheets consist of a plurality of first strip-shaped sheets 4000, 4000' having a first height (total height of the shutter curtain 1') consisting of a wide sheet 40 and a narrow sheet 41, and a plurality of second strip-shaped sheets 4100 having a second height consisting only of the wide sheet 40. The first strip-shaped sheet 4000' is a sheet in which one half has the first height and the other half has the second height. The first strip-shaped sheet 4000' is a single sheet piece and has a corner formed by the lower end of the wide sheet 40 and the upper end of the narrow sheet 41, and the connection part of the plurality of strip-shaped sheets is not located at the corner. Because the connecting sections of the strip-shaped sheets 4000, 4100, and 4000' extend in the height direction of the sheet, the impact of the sheet's own weight on the connecting section is smaller compared to when multiple sheets are connected in the height direction (where the connecting section extends horizontally).

[0118] [B-5] Middle part The intermediate section 12 will be described with reference to Figures 42, 51, 54, and 55. The first intermediate section 12A is located below the second section 13B of the bottom member 13 of the upper section 10 of the shutter curtain 1', and the second intermediate section 12B is located below the third section 13C of the bottom member 13. The intermediate section 12 (first intermediate section 12A, second intermediate section 12B) is located to the side of the upper section of the lower section 11.

[0119] The intermediate section 12 is a panel body having predetermined height, depth, and width dimensions, and its upper end is fixed to the lower surface of the second section 13B of the bottom member 13 of the upper section 10. More specifically, the intermediate section 12 according to this embodiment consists of a panel body assembled from a plurality of square pipe-shaped frames (frames extending horizontally in the width direction, frames extending horizontally in the depth direction, and frames extending vertically) corresponding to each side of a rectangular parallelepiped. A sheet 120 is attached to the visible surface of the panel body. The sheet 120 is attached to a predetermined frame of the panel body with screws using a sheet retaining member 7. The panel body according to this embodiment further comprises a plurality of intermediate frames. An attachment piece for the lower end of the bottom member 13 is formed on the upper surface of the panel body. An attachment piece for the intermediate guide rail G3 is formed on the inner depth surface of the panel body.

[0120] As shown in Figure 48A, the panel body of the intermediate section 12 (intermediate section 12B) comprises a first visible surface (sheet 120), a second visible surface (sheet 120), an inner (first side in the visible width direction) visible surface (a pair of vertical visible frames 127, an upper visible frame 126, and a lower visible frame 122), an outer (second side in the visible width direction) visible surface (a pair of vertical visible frames 127', an upper visible frame 126', and a lower visible frame 122'), a top surface (a pair of upper visible frames 125, upper visible frames 126, and 126'), and a bottom surface (a pair of lower visible frames 121, and lower visible frames 122 and 122'). Mounting pieces 128 for the intermediate guide rail G3 are formed on the inner visible surface. Mounting pieces 129 for the lower end of the bottom member 13 are formed on the top surface.

[0121] In this embodiment, a pair of lower lower visible frames 121 extending horizontally and parallel in the opening width direction, and a lower recessed frame 122 connecting the ends of the pair of lower visible frames 121 on the intermediate guide rail G3 side, constitute elements of a third guide means described later. An actuator 123 for activating a detection switch MS1 is provided at the lower part of a predetermined portion in the width direction of the intermediate portion 12. A pair of buffer pieces 124 are provided at the lower end of the intermediate portion 12, extending vertically downward from the lower end of the sheet 120 across the width direction.

[0122] The height dimension of the intermediate section 12 is approximately the same as the height dimension of the lower section 11 when it is in an extended or retracted state. The depth of the intermediate section 12 is approximately the same as the depth of the upper section 10 and the lower section 11, and when the opening is fully closed, the wide sheet 40, the narrow sheet 41, and the sheet 120 of the intermediate section 12 are flush with each other to form a vertical surface. In this embodiment, the visible width dimension of the first intermediate section 12A is narrow, and the visible width dimension of the second intermediate section 12B is wide.

[0123] The first intermediate section 12A and the second intermediate section 12B have facing surfaces that are spaced apart from each other, and each facing surface is provided with an intermediate guide rail G3 extending in the height direction. As will be described later, the intermediate guide rail G3 consists of a first guide rail 8 and a pair of second guide rails 9. The intermediate guide rail G3 is located directly above the lower guide rail G2, and together with the lower guide rail G2, the intermediate guide rail G3 guides both ends of the narrow lower section 11 in the width direction. The height dimension of the intermediate guide rail G3 according to this embodiment is approximately the same as the height dimension of the intermediate section 12. In the illustrated embodiment, the lower end of the intermediate guide rail G3 protrudes slightly below the lower end of the intermediate section 12.

[0124] When the opening is fully closed, the lower portion 11 is in a folded state, and the overlapping structural members 2'' and bottom member 3'' are located in the space between the intermediate guide rails G3, with the lower end (lower end of bottom member 3'') being at approximately the same height as the lower end of the intermediate portion 12 (see Figure 37).

[0125] In the fully closed state of the opening, the first intermediate portion 12A closes the first side portion of the intermediate opening in the opening width direction, the second intermediate portion 12B closes the second side portion of the intermediate opening in the opening width direction, and the space between the first and second side portions of the intermediate portion is closed by the upper portion of the lower portion 11 (see Figures 36, 47, and 48).

[0126] [C] Guide mechanism [C-1] First guide rail and second guide rail In the second embodiment, both ends in the width direction of the upper portion 10 of the shutter curtain 1' are guided by left and right upper guide rails G1 provided at both ends in the width direction of the upper opening, and both ends in the width direction of the lower portion 11 are guided by left and right lower guide rails G2 provided at both ends in the width direction of the lower opening, and left and right intermediate guide rails G3 provided in the first intermediate portion 12A and the second intermediate portion 12B. In the second embodiment, the upper guide rails G1, lower guide rails G2, and intermediate guide rails G3 each consist of a first guide rail 8 located approximately in the center of the depth of the shutter curtain 1' and extending in the visible direction, and a pair of second guide rails 9 located so as to sandwich the first guide rail 8 in a plan view and extending in the visible direction.

[0127] The first guide rail 8 is located approximately in the center of the depth of the shutter curtain 1', with its base end fixed to the building structure C, and has a guide portion on its leading end in the visible direction. The guide portion of the first guide rail 8 comprises a first portion 80 located approximately in the center of the depth of the shutter curtain 1' and extending in the visible direction, and a second portion 81 extending in the depth direction at the tip of the first portion 80, and in this embodiment has a T shape in plan view. The base end of the first portion 80 is a wide portion 800, and a fixing piece 82 is formed at the base end of the wide portion 800. The first guide rail 8 is attached to the building structure C by fixing the fixing piece 82 to the building structure C with bolts.

[0128] The second guide rail 9 is fixed at its base end to the building structure C, and its leading end portion in the visible direction is positioned on the visible surfaces of both ends in the width direction of the shutter curtain 1', so as to abut or approach both ends in the width direction of the sheet 4 (wide sheet 40, narrow sheet 41) from the inside. The second guide rail 9 comprises a leading end first visible piece 90, a base end second visible piece 91 located inward in the depth direction relative to the first visible piece 90, and a stepped portion 92 located between the base end of the first visible piece 90 and the leading end of the second visible piece 91. The width direction ends of the sheet 4 (wide sheet 40, narrow sheet 41) abut or approach the outer surface of the first visible piece 90. A fixing piece 93 extending perpendicularly to the second visible piece 91 is provided at the base end of the second visible piece 91, and the second guide rail 9 as a whole has a roughly L shape in plan view. A pair of second guide rails 9 are positioned to sandwich the first guide rail 8 in a plan view.

[0129] The first portion 80 of the first guide rail 8 is received between the pair of guide elements: the guide receiving portion 25 of each aggregate member 2', 2'', the upper guided portion 36 and lower guided portion 37 of the bottom member 3', and the upper guided portion 136 and lower guided portion 137 of the bottom member 13. The widthwise ends of the first sheet 4A' are located outside one of the second guide rails 9, and the widthwise ends of the second sheet 4B' are located outside the other second guide rail 9. Details of the first guide mechanism with the first guide rail 8 and the second guide mechanism with the second guide rail 9 can be referenced from the description in the first embodiment.

[0130] [C-2] Alignment of the guide rails on the lower part The guide rail that guides both ends in the width direction of the lower portion 11 of the shutter curtain 1' consists of a lower guide rail G2 and an upper intermediate guide rail G3. The intermediate guide rail G3 is a movable guide rail that moves up and down along with the vertical movement of the upper portion 10 and the intermediate portion 12, positioned directly above the fixed guide rail, the lower guide rail G2. Therefore, when the shutter curtain 1' is closed, a guide means is provided to align the upper end of the fixed lower guide rail G2 attached to the building structure with the lower end of the movable intermediate guide rail G3 attached to the upper portion 10. When the upper end of the lower guide rail G2 and the lower end of the intermediate guide rail G3 are aligned to form a single guide rail that guides both ends in the width direction of the lower portion 11, the upper end 96 of the second guide rail 9 of the lower guide rail G2 and the lower end 95 of the second guide rail 9 of the intermediate guide rail G3 come into contact and form a joint surface (see Figures 47, 58, and 59).

[0131] The alignment guide means will be described with reference to Figures 54 to 59. In this embodiment, the alignment guide means includes a first guide means for aligning the lower end of the first guide rail 8 of the upper intermediate guide rail G3 with the upper end of the first guide rail 8 of the lower guide rail G2; a second guide means for aligning the lower ends 95 of the pair of second guide rails 9 of the upper intermediate guide rail G3 with the upper ends 96 of the pair of second guide rails 9 of the lower guide rail G2; and a third guide means provided on the intermediate floor surface FL2 to which the lower end of the intermediate portion 12 abuts, for positioning the intermediate portion 12 (to which the intermediate guide rail G3 is attached) in the depth direction and / or the visibility direction.

[0132] The first guide means according to this embodiment includes a first guide member 17 attached to the lower end of the wide portion 800 on the base end side of the first portion 80 of the first guide rail 8 of the intermediate guide rail G3, and a locking portion formed on the upper end of the wide portion 800 on the base end side of the first portion 80 of the first guide rail 8 of the lower guide rail G2. The first guide member 17 consists of a mounting piece 170 attached to the lower end of the first portion 80 of the first guide rail 8, and a pair of inclined first guide pieces 171 that extend downward in an expanding manner from the lower end of the first portion 80 of the first guide rail 8. When the upper intermediate guide rail G3 descends from a position spaced upward relative to the upper end of the lower guide rail G2, the first guide pieces 171 protruding downward from the lower end of the intermediate guide rail G3 engage with the locking portion on the upper end of the wide portion 800 of the first portion 80 of the first guide rail 8 of the lower guide rail G2, thereby positioning in the depth direction. In this embodiment, when fully closed (when the first guide piece 171 of the intermediate guide rail G3 is engaged with the locking portion of the lower guide rail G2), the lower end of the first guide rail 8 of the intermediate guide rail G3 and the upper end of the first guide rail 8 of the lower guide rail G2 are spaced apart (there is a gap). In this embodiment, a pair of inclined surfaces 172 (locking portions) are formed at the upper end of the wide portion 800 of the first part 80 of the first guide rail 8 of the lower guide rail G2 (see Figure 56A), and when the intermediate portion 12 descends when the opening is closed, the inclined pair of first guide pieces 171 of the first guide member 17 are guided by the inclined surfaces 172 and positioned in the depth direction. Since the first guide member 17 is formed on the wide portion 800 on the base end side of the first part 80 of the first guide rail 8, it does not interfere with the guiding function of the first guide rail 8. In the illustrated embodiment, the pair of inclined first guide pieces 171 extend in a straight line, but the shape of the first guide piece 171 is not limited. For example, it may be a pair of inclined curved pieces 171' (Figure 43A) that extend downward in an expanding manner, or each first guide piece 171 may be an inclined piece 171'' (Figure 43A) formed from an upper inclined portion that is inclined at a first angle with respect to the vertical (an acute angle with respect to the vertical plane) and a lower inclined portion that is inclined at a second angle with respect to the vertical (a more obtuse angle with respect to the vertical plane than the first angle).

[0133] The second guide means according to this embodiment includes a second guide member 18 attached to the lower end of the first visible piece 90 of the second guide rail 9 of the intermediate guide rail G3, and the upper end portion of a pocket portion 94 formed in the first visible piece 90 of the second guide rail 9 of the lower guide rail G2. The second guide member 18 consists of an upper fixing piece 180 fixed to the second guide rail 9, and a lower second guide piece 181 protruding downward from the lower end 95 of the second guide rail 9. The tip (lower end) of the second guide piece 181 is tapered. In this embodiment, a pocket portion 94 extending in the height direction is formed on the back surface of the base end side of the first visible piece 90 of the second guide rail 9, and the fixing piece 180 of the second guide member 18 is attached to and fixed in the pocket portion 94. As the upper intermediate guide rail G3 descends from a position spaced upward relative to the upper end of the lower guide rail G2, the second guide piece 181 protruding downward from the lower end of the intermediate guide rail G3 engages with a pocket formed on the back surface of the base end side of the first visible piece 90 of the second guide rail 9 of the lower guide rail G2, thereby positioning in the depth direction and the visible direction.

[0134] The third guide means according to this embodiment includes a third guide member 19 provided on the intermediate floor surface FL2 to which the lower end of the intermediate portion 12 abuts, and a pair of lower visible frames 121 and lower recessed frames 122 of the intermediate portion 12. The third guide member 19 includes a pair of visible surfaces 190, a recessed surface 191, and an upper surface 192. The upper portion of the vertical part of the pair of visible surfaces 190 is an inclined surface 1900 that slopes upward toward each other, and the upper portion of the vertical part of the recessed surface 191 is an inclined surface 1910 that slopes upward toward the other recessed surface.

[0135] In this embodiment, two third guide members 19 are provided on the intermediate floor surface FL2 to which the lower end of the first intermediate portion 12A abuts, spaced apart in the width direction and facing in different directions. The third guide member 19 on the side closer to the intermediate guide rail G3 is oriented so that its inclined surface 1910 is on the side closer to the intermediate guide rail G3. Two third guide members 19 are provided on the intermediate floor surface FL2 to which the lower end of the second intermediate portion 12B abuts, spaced apart in the width direction and facing in different directions. The third guide member 19 on the side closer to the intermediate guide rail G3 is oriented so that its inclined surface 1910 is on the side closer to the intermediate guide rail G3.

[0136] In this embodiment, when the lower end of the intermediate guide rail G3 coincides with the upper end of the lower guide rail G2, the inner surfaces of the pair of lower visible frames 121 that extend horizontally and parallel in the opening width direction come into close proximity to or slide against the vertical portions of the pair of visible surfaces 190 of the third guide member 19. As the intermediate portion 12 and the intermediate guide rail G3 descend from a position spaced upward relative to the upper end of the lower guide rail G2, the inner surfaces of the lower visible frames 121 are guided by the upper inclined surfaces 1900 of the pair of visible surfaces 190 of the third guide member 19 as they descend, thereby achieving positioning in the depth direction.

[0137] When the lower end of the intermediate guide rail G3 coincides with the upper end of the lower guide rail G2, the inner surface of the lower projection frame 122 of the first intermediate section 12A and the second intermediate section 12B comes into close proximity to or sliding contact with the vertical portion of the projection surface 191 of the third guide member 19. As the intermediate section 12 and the intermediate guide rail G3 descend from a position spaced upward relative to the upper end of the lower guide rail G2, the inner surface of the lower projection frame 122 is guided by the upper inclined surface 1910 of the projection surface 191 of the third guide member 19 as it descends, thereby achieving positioning in the visible direction.

[0138] In this embodiment, when the shutter curtain 1' is closed, alignment is performed in the order of the third guide means, the first guide means, and the second guide means, but this order is not limited. Also, the guide means may be any one of the first guide means, the second guide means, and the third guide means or a combination of more than one. In the third guide means that performs positioning in the depth direction, the intermediate portion 12 may be positioned by sandwiching it from the depth direction with a pair of third guide members provided spaced apart in the depth direction on the intermediate floor surface FL2.

[0139] A microswitch is provided adjacent to the third guide member 19 installed on the intermediate floor surface FL2, and an actuator 123 is provided in the lower part of the intermediate section 12 such that the detection switch MS1 turns OFF when the lower end of the intermediate section 12 is guided in the depth direction and the visible direction and descends to a predetermined position. When the detection switch MS1 is in the OFF state, it can be determined that the upper section 10 and the intermediate section have descended to their lower ends, and that the lower end of the intermediate guide rail G3 and the upper end of the lower guide rail G2 are aligned. In this embodiment, there are a total of four third guide members 19, two on the first intermediate floor surface FL2 located below the first intermediate section 12A and two on the second intermediate floor surface FL2 located below the second intermediate section 12B (see Figure 37), but there may also be one on the first intermediate floor surface FL2 near the intermediate guide rail G3 and one on the second intermediate floor surface FL2 near the intermediate guide rail G3, for a total of two. Alternatively, at the second intermediate floor surface FL2, one or more third guide members 19 may be provided between the two third guide members 19 shown in Figure 37, thereby providing a total of five or more third guide members 19.

[0140] [D] Shutter opening and closing operation The sheet shutter according to this embodiment is electrically opened and closed by a winding device 6 driven by an electric motor M. When opening the opening, the first wire W1, second wire W2, and third wire W3 are wound onto the winding drums 60 of the first winding device 6A, second winding device 6B, and third winding device 6C, causing the shutter curtain 1' to rise with the bottom member 3', multiple frame members 2'', bottom member 13, and multiple frame members 2' overlapping in the height direction, and the first sheet 4A' and second sheet 4B' are folded outwards on the first and second sides respectively, resulting in a fully open opening. In this embodiment, the depth dimensions of the upper part 10 and the lower part 11 of the shutter curtain 1' are approximately the same. More specifically, the depth dimensions of the frame members 2' of the upper part 10, the bottom member 13, the frame members 2'' of the lower part 11, and the bottom member 3' are approximately the same (see Figures 41 and 61).

[0141] When the shutter curtain 1' is raised, the upper end (upper surface 301) of the bottom member (lower bottom) 3' abuts against the lower end 23 of the frame member 2'', and in adjacent frame members 2'' vertically, the upper end 22 of the lower frame member 2'' abuts against the lower end 23 of the upper frame member 2''. The upper surface 301 of the upper frame 30 of the bottom member 3', which moves upward due to the upward movement of the suspension wire W, abuts against the horizontal surface 230 of the lower end 23 of the lowest frame member 2'', causing the frame member 2'' to move upward, and the horizontal surface 220 of the upper end 22 of the frame member 2'' abuts against the horizontal surface 230 of the lower end 23 of the frame member 2'' located above it, causing the frame member 2'' to move upward.

[0142] The upper end 22 of the uppermost structural member 2'' of the upward-moving lower portion 11 abuts against the lower surface 1311 of the bottom member (upper bottom) 13 at the lower end of the upper portion 10, and the upper end (upper surface 1301) of the bottom member (upper bottom) 13 abuts against the lower end 23 of the structural member 2'', so that in adjacent structural members 2'' vertically, the upper end 22 of the lower structural member 2'' abuts against the lower end 23 of the upper structural member 2''. The upward movement of the suspension wire W causes the upper surface 1301 of the upper frame 130 of the upward-moving bottom member 13 to abut against the horizontal surface 230 of the lower end 23 of the lowest structural member 2'', causing the structural member 2'' to move upward, and the horizontal surface 220 of the upper end 22 of the structural member 2'' abuts against the horizontal surface 230 of the lower end 23 of the structural member 2'' located above, causing the structural member 2'' to move upward.

[0143] In a state where the bottom member 3' and the frame member 2'' directly above it are superimposed, the protrusion 33 on the upper surface 301 of the bottom member 3 is located inside the downward-facing protrusions of the lower end portions 23 of the frame members 2'' located on both sides in the depth direction. In this embodiment, the height of the protrusion 33 is lower than the height of the downward-facing protrusion of the lower end portion 23, and the portions that are spaced apart from the vertical surface 232 on the inside of the downward-facing protrusion are the lower vertical surface 330 and the upper inclined surface 331 (refer to Figure 34). When the shutter curtain 1' moves upward (when the shutter curtain 1' is pulled up), if the bottom member 3' and the upper frame member 2'' are spaced apart and shift in the depth direction, the inclined surface 331 of one of the protrusions 33 contacts the corner between the vertical surface 232 on the inside of the downward-facing protrusion and the horizontal surface 230, thereby restricting the shift. If the bottom member 3' and the upper structural member 2'' are in contact and shift in the depth direction, the vertical surface 330 of one of the protrusions 33 will come into contact with the inner vertical surface 232 of the other downward-facing protrusion, thereby restricting the shift.

[0144] In a state where the aggregates 2'' of the lower portion 11 are overlapping, the horizontal surface 220 of the recess of the upper end portion 22 of the lower aggregate 2'' abuts against the horizontal surface 230 of the convex portion 23 of the lower aggregate 2'', the inclined surface 2210 of the recess of the upper end portion 22 of the lower aggregate 2'' is close to or abuts against the inclined surface 231 of the convex portion 23 of the lower aggregate 2'', the inner vertical surface 232 of the downward convex portion 23 of the lower aggregate 2'' faces the inner side surface of the convex portion 222 inside the recess of the upper end portion 22 of the lower aggregate 2'', and the upper end of the convex portion 222 faces the inner horizontal surface 233. When the shutter curtain 1 is moving upward (when the shutter curtain 1' is pulled up), if the upper and lower structural members 2'' are separated and shift in the depth direction, or if the upper and lower structural members 2'' are in contact and shift in the depth direction, the vertical surface 232 of one of the protrusions will come into contact with the inner protrusion 222 of the other, and the inclined surface 2210 of the other will come into contact with the inclined surface 231, thereby restricting the shift.

[0145] In a state where the bottom member 13 and the aggregate 2'' directly below it are superimposed, the upper end of the inner protrusion 222 and the upper end of the outer protrusion 221 of the upper end 22 of the aggregate 2'' abut against the lower surface 1311 of the bottom member 13, and the protrusions 134 of the lower surface 1311 of the bottom member 13 are positioned opposite the inner protrusions 222 of the upper end 22 of the aggregate 2'' located on both sides in the depth direction. In this embodiment, the protrusions 134 are provided on the lower surface 1311 of the bottom member 13 on the side away from the visible surface 1310, and the side facing the visible surface 1310 is formed from an upper vertical surface 1340 and a lower inclined surface 1341 that slopes away from the visible surface 1310 from the lower end of the vertical surface 1340. When the shutter curtain 1' is moving upward (when the shutter curtain 1' is being pulled up), if the bottom member 13 and the lower frame member 2'' are separated and shift in the depth direction, the upper end of one of the inner protrusions 222 will come into contact with the inclined surface 1341 of one of the protrusions 134, thereby restricting the shift. When the bottom member 13' and the upper frame member 2'' are in contact and shift in the depth direction, the vertical surface 1340 of one of the protrusions 134 will come into contact with the visible surface of one of the inner protrusions 222, thereby restricting the shift.

[0146] In a state where the bottom member 13 and the frame member 2' directly above it are superimposed, the protrusion 133 on the upper surface 1301 of the bottom member 13 is located inside the downward-facing protrusions 23 of the lower ends 23 of the frame members 2' located on both sides in the depth direction. In this embodiment, the height of the protrusion 133 is lower than the height of the downward-facing protrusion of the lower end 23, and the parts that are spaced apart from the vertical surface 232 on the inside of the downward-facing protrusion are the lower vertical surface 1330 and the upper inclined surface 1331. When the shutter curtain 1' moves upward (when the shutter curtain 1' is pulled up), if the bottom member 13 and the upper frame member 2' are spaced apart and shift in the depth direction, the inclined surface 1331 of one of the protrusions 133 contacts the corner between the vertical surface 232 on the inside of the downward-facing protrusion and the horizontal surface 230, thereby restricting the shift. If the bottom member 13 and the upper structural member 2' are in contact and shift in the depth direction, the vertical surface 1330 of one of the protrusions 133 will come into contact with the inner vertical surface 232 of the other downward-facing protrusion, thereby restricting the shift.

[0147] In a state where the aggregates 2' of the lower portion 11 are overlapping, the horizontal surface 220 of the recess of the upper end portion 22 of the lower aggregate 2' abuts against the horizontal surface 230 of the convex portion 23 of the lower aggregate 2', the inclined surface 2210 of the recess of the upper end portion 22 of the lower aggregate 2' is close to or abuts against the inclined surface 231 of the convex portion 23 of the lower aggregate 2', the inner vertical surface 232 of the downward convex portion 23 of the lower aggregate 2' faces the inner side surface of the convex portion 222 inside the recess of the upper end portion 22 of the lower aggregate 2', and the upper end of the convex portion 222 faces the inner horizontal surface 233. When the shutter curtain 1' moves upward (when the shutter curtain 1' is pulled up), if the upper and lower structural members 2' are separated and shift in the depth direction, or if the upper and lower structural members 2' are in contact and shift in the depth direction, the vertical surface 232 of one of the protrusions will come into contact with the inner protrusion 222 of the other, and the inclined surface 2210 of the other will come into contact with the inclined surface 231, thereby restricting the shift.

[0148] When the opening is fully closed, the extended upper portion 10 closes the upper opening, the extended lower portion 11 closes the lower opening, and the first intermediate portion 12A, the second intermediate portion 12B, and the upper portion of the extended lower portion 11 close the intermediate opening. Both ends of the upper portion 10 in the width direction are guided by an upper guide rail G1 provided on the building structure, and both ends of the lower portion 11 in the width direction are guided by a lower guide rail G2 provided on the building structure and by intermediate guide rails G3 provided on the first intermediate portion 12A and the second intermediate portion 12B.

[0149] When the opening is fully closed, the portion of the upper portion 10 located outside the first intermediate portion 12A and the second intermediate portion 12B at the lower end is spaced apart from the upper floor surface FL1 and does not interfere with the rail R provided on the upper floor surface FL1. Although no cushioning material is provided at the portion of the lower end of the upper portion 10 that is covered, cushioning material may be provided in a manner that avoids the rail R.

[0150] The lower end of the first intermediate section 12A abuts against the intermediate floor surface FL2 via a buffer piece 124, and the outer projection surface of the first intermediate section 12A and the intermediate side wall C1 are spaced apart and facing each other. The lower end of the second intermediate section 12B abuts against the intermediate floor surface FL2 via a buffer piece 124, and the outer projection surface of the second intermediate section 12B and the intermediate side wall C1 are spaced apart and facing each other. Guide rails are not provided at both ends in the width direction of the intermediate opening.

[0151] [III] Operation control of sheet shutter [A] Sheet shutter according to the first embodiment The sheet shutter according to the first embodiment opens and closes the opening by a shutter curtain 1 having the same width dimension across the entire height of the opening. As shown in Figure 63, the sheet shutter according to the first embodiment is equipped with a first drive device 6A' and a second drive device 6B'. The first drive device 6A' raises and lowers a first wire W1, and the second drive device 6B' raises and lowers a second wire W2, thereby electrically raising and lowering the shutter curtain 1 to open and close the opening. The first drive device 6A' is equipped with a first winding device 6A driven by a first motor M1, and the second drive device 6B' is equipped with a second winding device 6B driven by a second motor M2.

[0152] When opening the opening, the first motor M1 and the second motor M2 are driven, respectively, to simultaneously wind the first wire W1 and the second wire W2 onto the winding drums 60 of the first winding device 6A and the second winding device 6B. As a result, the shutter curtain 1 rises with multiple frame members 2 and bottom members 3 overlapping in the height direction, and the sheets 4A and 4B fold outwards on the first and second sides respectively, resulting in a fully open opening (see Figures 2, 6, and 7).

[0153] When closing the opening, the first motor M1 and the second motor M2 are driven, respectively, to simultaneously unwind the first wire W1 and the second wire W2 from the winding drums 60 of the first winding device 6A and the second winding device 6B. As a result, the shutter curtain 1 descends with the frame 2 and bottom member 3 separated in the height direction, the sheets 4A and 4B extend vertically in the height direction, and the buffer member 34 at the lower end of the bottom member 3 touches the ground, resulting in a fully closed opening (see Figures 1, 4, and 5).

[0154] The first drive unit 6A' is equipped with a first encoder ENC1. The first encoder ENC1 counts the number of rotations of a predetermined rotating part of the first drive unit 6A' as the number of pulses. The amount of the first wire W1 pulled out is determined by the number of pulses, and the position of the shutter curtain 1 (height position in the opening) at the location where the first wire W1 is attached is detected. The first encoder ENC1 can detect the upper and lower limits of the position of the shutter curtain 1 (height position in the opening) at the location where the first wire W1 is attached. In this embodiment, the number of pulses corresponding to the lower limit position of the shutter curtain 1 (fully closed position of the shutter curtain 1) is set to 0, and the position of the shutter curtain 1 corresponding to the first drive unit 6A' is detected by the number of pulses.

[0155] The second drive unit 6B' is equipped with a second encoder ENC2. The second encoder ENC2 counts the number of rotations of a predetermined rotating part of the second drive unit 6B' as the number of pulses. The amount of the second wire W2 pulled out is determined by the number of pulses, and the position of the shutter curtain 1 (height position in the opening) at the location where the second wire W2 is attached is detected. The second encoder ENC2 can detect the upper and lower limits of the position of the shutter curtain 1 (height position in the opening) at the location where the second wire W2 is attached. In this embodiment, the number of pulses corresponding to the lower limit position of the shutter curtain 1 (fully closed position of the shutter curtain 1) is set to 0, and the position of the shutter curtain 1 corresponding to the second drive unit 6B' is detected by the number of pulses.

[0156] In this embodiment, the first drive unit 6A' and the second drive unit 6B' are equipped with inverters 1 and 2, respectively, and control the speed obtained by the first motor M1 and the second motor M2 according to predetermined settings, corresponding to the position of the shutter curtain 1 detected by the first encoder ENC1 and the second encoder ENC2, respectively, making it possible to change the lifting and lowering speed of the shutter curtain 1 according to the height position of the shutter curtain 1.

[0157] The sheet shutter according to the first embodiment is provided with an upper limit switch LSU1 and a lower limit switch LSD1 corresponding to the shutter curtain 1 corresponding to the first wire W1 which is raised and lowered by the first drive device 6A', and an upper limit switch LSU2 and a lower limit switch LSD2 corresponding to the shutter curtain 1 corresponding to the second wire W2 which is raised and lowered by the second drive device 6B'. The upper limit switch LSU1, lower limit switch LSD1, upper limit switch LSU2, and lower limit switch LSD2 are mechanical detection means for mechanically detecting the position of the shutter curtain 1.

[0158] The sheet shutter according to the first embodiment is provided with a first emergency switch EMS1 that operates at a position above the upper limit switch LSU1 in correspondence with the shutter curtain 1 corresponding to the first wire W1 which is raised and lowered by the first drive unit 6A', and a second emergency switch EMS2 that operates at a position above the upper limit switch LSU2 in correspondence with the shutter curtain 1 corresponding to the second wire W2 which is raised and lowered by the second drive unit 6B'.

[0159] In the sheet shutter according to the first embodiment, a photoelectric sensor OS is provided at a predetermined height position below the left and right guide rails G, and is configured to detect an obstacle (including a person) located in the opening when a light beam extending in the opening width direction is blocked. When the photoelectric sensor OS detects an obstacle, the downward movement of the shutter curtain 1 is stopped.

[0160] As shown in Figures 1 to 3 and Figure 26, the two first wires W1 are wound around the first pulleys 5A of the first pulley set above the opening, extend toward the center of the opening, and are connected to the first winding device 6A, making them retractable by the first winding device 6A. The first pulley 5A is provided with a first wire slack detection means WD1. When the first wire slack detection means WD1 detects slack in the first wires W1, the raising and lowering operation of the shutter curtain 1 is stopped.

[0161] As shown in Figures 1 to 3, the two second wires W2 are wound around the second pulleys 5B of the second pulley set above the opening, extend toward the center of the opening, and are connected to the second winding device 6B, making them retractable. The second pulley 5B is equipped with a second wire slack detection means WD2. When the second wire slack detection means WD2 detects slack in the second wires W2, the raising and lowering operation of the shutter curtain 1 is stopped.

[0162] The sheet shutter according to this embodiment is equipped with a bottom lock mechanism that prevents the shutter curtain 1 from lifting up when the opening is fully closed. The locking device 15 of the bottom lock mechanism is equipped with a detection switch MS that detects when the locking device 15 is in the locked state. When the locking portion 150 is in the locked position, that is, when the locking device 15 is in the locked state, the detection switch MS is in the OFF state, and when the detection switch MS is in the OFF state, the electric opening and closing of the shutter curtain 1 is disabled.

[0163] The first drive unit 6A' and the second drive unit 6B' are operated by linked operation from the control unit to operate the shutter curtain 1. The sheet shutter according to this embodiment has two operating modes: linked mode and single-acting mode, and normal opening and closing is performed in linked mode. The control unit according to this embodiment includes a linked operation unit (see Figure 73) and a single-acting operation unit (see Figure 74, Figure 74 is a single-acting operation unit for the second embodiment), and the linked mode and single-acting mode can be switched by a mode change switch (see Figure 74). The control unit is provided in an operation box installed on the floor for ease of operation, but in this embodiment, a maintenance operation unit is provided above the opening. Details of the control unit will be described later.

[0164] As shown in Figure 64, the opening and closing operation of the sheet shutter is controlled by the control unit CU. The control unit CU is a computer and includes a processor, memory, input unit, and output unit. The memory stores a program that performs predetermined control in response to predetermined inputs. The normal operating mode is the interlocking mode, in which the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) are driven simultaneously in response to the input of open, close, and stop signals from the interlocking operation unit, causing the shutter curtain 1 to open and close. Details of the operation control by the control unit CU will be described later.

[0165] [B] Sheet shutter according to the second embodiment The shutter curtain 1' according to the second embodiment consists of a wide upper portion 10 and a narrow lower portion 11. In a more specific embodiment of the second embodiment, as shown in Figures 36 and 37, the shutter curtain 1' consists of a wide upper portion 10, a narrow lower portion 11, and an intermediate portion 12 located below the upper portion 10 and at the same height as the upper portion of the lower portion 11. However, it should be noted that the embodiment shown in Figure 67 is a generalized representation of the shutter curtain 1' according to the second embodiment, and the intermediate portion 12 is omitted. Furthermore, it will be understood by those skilled in the art that the following description of the second embodiment can also be applied to a shutter curtain 1' that includes an intermediate portion 12.

[0166] As shown in Figure 67, the sheet shutter according to the second embodiment includes a first drive unit 6A', a second drive unit 6B', and a third drive unit 6C'. The first drive unit 6A' raises and lowers the first wire W1, and the second drive unit 6B' raises and lowers the second wire W2, thereby electrically raising and lowering the lower portion 11 of the shutter curtain 1'. The first drive unit 6A' raises and lowers the first wire W1, the second drive unit 6B' raises and lowers the second wire W2, and the third drive unit 6C' raises and lowers the third wire W3, thereby raising and lowering the upper portion 10 and the middle portion 12 of the shutter curtain 1' to open and close the opening. The first drive unit 6A' includes a first winding device 6A driven by a first motor M1, the second drive unit 6B' includes a second winding device 6B driven by a second motor M2, and the third drive unit 6C' includes a third winding device 6C driven by a third motor M3.

[0167] When opening the opening from the fully closed state, pressing the release switch SU from the interlocking operation unit simultaneously drives the first motor M1 and the second motor M2, respectively, and simultaneously winds the first wire W1 and the second wire W2 onto the winding drums 60 of the first winding device 6A and the second winding device 6B, respectively. As a result, the lower portion 11 of the shutter curtain 1' rises to an intermediate position with multiple frame members 2'' and the bottom member 3' overlapping in the height direction, and the sheets 4A' and 4B' (lower portion 11) are folded outwards on the first and second sides, respectively. In this embodiment, the rising of the shutter curtain 1' stops when it has risen to an intermediate position. At the intermediate position, by pressing the release switch SU from the interlocking operation unit, the first motor M1, the second motor M2, and the third motor M3 are driven simultaneously, and the first wire W1, the second wire W2, and the third wire W3 are wound simultaneously onto the winding drums 60 of the first winding device 6A, the second winding device 6B, and the third winding device 6C, respectively. As a result, the upper part 10 (and intermediate part 12) of the shutter curtain 1' rises with multiple frame members 2' and the bottom member 13 overlapping in the height direction, and the sheets 4A' and 4B' (upper part 10) are folded outwards on the first and second sides, respectively, resulting in a fully open opening (see Figure 37).

[0168] When closing the opening from the fully open state, pressing the closing switch SD from the interlocking operation unit simultaneously drives the first motor M1, second motor M2, and third motor M3, respectively, and simultaneously unwinds the first wire W1, second wire W2, and third wire W3 from the winding drums 60 of the first winding device 6A, second winding device 6B, and third winding device 6C, respectively. As a result, the upper portion 10 (and intermediate portion 12) of the shutter curtain 1' descends to an intermediate position with the frame material 2' and bottom member 13 separated in the height direction, and the sheets 4A' and 4B' (upper portion 10) extend vertically in the height direction. In this embodiment, the descent of the shutter curtain 1' stops when it has descended to the intermediate position. At the intermediate position, pressing the closing switch SD from the interlocking operation unit simultaneously drives the first motor M1 and the second motor M2, respectively, and unwinds the first wire W1 and the second wire W2 from the winding drums 60 of the first winding device 6A and the second winding device 6B. As a result, the lower part 11 of the shutter curtain 1', the frame 2'' and the bottom member 3', descend while separating in the height direction, and the sheets 4A and 4B (lower part 11) extend vertically in the height direction, and the buffer member 34 at the lower end of the bottom member 3 touches the ground, resulting in a fully closed opening (see Figure 36).

[0169] The first drive unit 6A' is equipped with a first encoder ENC1. The first encoder ENC1 counts the number of rotations of a predetermined rotating part of the first drive unit 6A' as the number of pulses. The amount of the first wire W1 pulled out is determined by the number of pulses, and the position of the shutter curtain 1' (height position in the opening) at the location where the first wire W1 is attached is detected. The first encoder ENC1 can detect the upper and lower limits of the position of the shutter curtain 1' (height position in the opening) at the location where the first wire W1 is attached. In this embodiment, the number of pulses corresponding to the lower limit position of the shutter curtain 1' (fully closed position of the shutter curtain 1) is set to 0, and the position of the shutter curtain 1' corresponding to the first drive unit 6A' is detected by the number of pulses.

[0170] The second drive unit 6B' is equipped with a second encoder ENC2. The second encoder ENC2 counts the number of rotations of a predetermined rotating part of the second drive unit 6B' as the number of pulses. The amount of the second wire W2 pulled out is determined by the number of pulses, and the position of the shutter curtain 1' (height position in the opening) at the location where the second wire W2 is attached is detected. The second encoder ENC2 can detect the upper and lower limits of the position of the shutter curtain 1' (height position in the opening) at the location where the second wire W2 is attached. In this embodiment, the number of pulses corresponding to the lower limit position of the shutter curtain 1 (the fully closed position of the shutter curtain 1') is set to 0, and the position of the shutter curtain 1' corresponding to the second drive unit 6B' is detected by the number of pulses.

[0171] The third drive unit 6C' is equipped with a third encoder ENC3. The third encoder ENC3 counts the number of rotations of a predetermined rotating part of the third drive unit 6C' as pulses. The amount of the third wire W3 is pulled out is determined by the number of pulses, and the position of the upper part 10 of the shutter curtain 1' (height position at the opening) at the location where the third wire W3 is attached is detected. The third encoder ENC3 can detect the upper limit and lower limit (intermediate position) of the position of the upper part 10 of the shutter curtain 1' (height position at the opening) at the location where the third wire W3 is attached. In this embodiment, the number of pulses of the third encoder ENC3 corresponding to the intermediate position is set to match the number of pulses of the first encoder ENC1 and the second encoder ENC2 corresponding to the intermediate position, and the position of the shutter curtain 1' (upper part 11) corresponding to the third drive unit 6C' is detected by the number of pulses.

[0172] In this embodiment, the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' are each equipped with inverters 1, 2, and 3, respectively. Corresponding to the position of the shutter curtain 1' detected by the first encoder ENC1, the second encoder ENC2, and the third encoder ENC3, respectively, the speeds obtained by the first motor M1, the second motor M2, and the third motor M3 are controlled according to predetermined settings, making it possible to change the lifting and lowering speed of the shutter curtain 1' depending on the height position of the shutter curtain 1'.

[0173] The sheet shutter according to the second embodiment is provided with an upper limit switch LSU1 and a lower limit switch LSD1 corresponding to the shutter curtain 1 corresponding to the first wire W1 which is raised and lowered by the first drive device 6A', an upper limit switch LSU2 and a lower limit switch LSD2 corresponding to the shutter curtain 1 corresponding to the second wire W2 which is raised and lowered by the second drive device 6B', and an upper limit switch LSU3 corresponding to the shutter curtain 1' corresponding to the third wire W3 which is raised and lowered by the third drive device 6C'. The upper limit switch LSU1, lower limit switch LSD1, upper limit switch LSU2, lower limit switch LSD2, and upper limit switch LSU3 are mechanical detection means for mechanically detecting the position of the shutter curtain 1.

[0174] The sheet shutter according to the second embodiment is equipped with an intermediate bottom switch that detects when the lower end of the upper portion 10 (intermediate portion 12) touches the intermediate floor surface when the shutter curtain 1' has descended to the intermediate portion. The intermediate bottom switch consists of a first intermediate bottom switch BS1, a second intermediate bottom switch BS2, and a third intermediate bottom switch BS3, which are located in the opening width direction and are positioned on the shutter curtain corresponding to the first wire W1, second wire W2, and third wire W3 that are raised and lowered by the first drive unit 6A', second drive unit 6B', and third drive unit 6C' (see Figure 67). For the configuration of the intermediate bottom switch, refer to the detection switch MS1 and actuator 123 shown in Figure 59.

[0175] The sheet shutter according to the second embodiment is provided with a first emergency switch EMS1 that operates at a position above the upper limit switch LSU1 in correspondence with the shutter curtain 1 corresponding to the first wire W1 which is raised and lowered by the first drive unit 6A', a second emergency switch EMS2 that operates at a position above the upper limit switch LSU2 in correspondence with the shutter curtain 1 corresponding to the second wire W2 which is raised and lowered by the second drive unit 6B', and a third emergency switch EMS3 that operates at a position above the upper limit switch LSU3 in correspondence with the shutter curtain 1' corresponding to the third wire W3 which is raised and lowered by the third drive unit 6C'.

[0176] In the sheet shutter according to the second embodiment, a photoelectric sensor OS is provided at a predetermined height position below the left and right guide rails G2, and is configured to detect an obstacle (including a person) located in the opening when a light beam extending in the opening width direction is blocked. When the photoelectric sensor OS detects an obstacle, the lowering operation of the shutter curtain 1' is stopped.

[0177] As shown in Figures 36, 38, and 39, the two first wires W1 are wound around the first pulleys 5A of the first pulley set above the opening, extend horizontally above the opening, and are connected to the first winding device 6A, making them retractable by the first winding device 6A. The first pulley 5A is provided with a first wire slack detection means WD1. When the first wire slack detection means WD1 detects slack in the first wires W1, the raising and lowering operation of the shutter curtain 1 is stopped.

[0178] As shown in Figure 36, the two second wires W2 are wound around the second pulleys 5B of the second pulley set above the opening, extend horizontally above the opening, and are connected to the second winding device 6B, making them retractable. The second pulley 5B is equipped with a second wire slack detection means WD2. When the second wire slack detection means WD2 detects slack in the second wires W2, the raising and lowering operation of the shutter curtain 1 is stopped.

[0179] As shown in Figure 36, the two third wires W3 are wound around the third pulleys 5C of the third pulley set above the opening, extend horizontally above the opening, and are connected to the third winding device 6C, making them retractable by the third winding device 6C. The third pulley 5C is equipped with a third wire slack detection means WD3. When the third wire slack detection means WD3 detects slack in the third wires W3, the raising and lowering operation of the shutter curtain 1' is stopped.

[0180] The sheet shutter according to this embodiment is equipped with a bottom lock mechanism to prevent the shutter curtain 1' from lifting up when the opening is fully closed. The locking device 15 of the bottom lock mechanism is equipped with a detection switch MS that detects when the locking device 15 is in the locked state. When the locking portion 150 is in the locked position, that is, when the locking device 15 is in the locked state, the detection switch MS is in the OFF state, and when the detection switch MS is in the OFF state, the electric opening and closing of the shutter curtain 1' is disabled.

[0181] The first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' are operated by an operation unit to operate the shutter curtain 1. In this embodiment, the shutter device has two operating modes: an interlocking mode and a single-acting mode, with normal opening and closing performed in interlocking mode. The operation unit according to this embodiment includes an interlocking operation unit (see Figure 73) and a single-acting operation unit (see Figure 74), and the interlocking mode and single-acting mode can be switched by a mode change switch (see Figure 74). The operation unit is provided in an operation box installed on the floor for ease of operation, but in this embodiment, a maintenance operation unit is provided above the opening. Details of the operation unit will be described later.

[0182] As shown in Figure 68, the opening and closing operation of the sheet shutter is controlled by the control unit CU. The control unit CU is a computer and includes a processor, memory, input unit, and output unit. The memory stores a program that executes predetermined controls in response to predetermined inputs. The normal operating mode is the interlocking mode, in which the first drive unit 6A' (first motor M1), the second drive unit 6B' (second motor M2), or the first drive unit 6A' (first motor M1), the second drive unit 6B' (second motor M2), and the third drive unit 6C' (third motor M3) are driven simultaneously in response to the input of open, close, and stop signals from the interlocking operation unit, causing the shutter curtain 1' to open and close. Details of the operation control by the control unit CU will be described later.

[0183] [C] Operation section The control unit will now be described in detail. As shown in Figures 63 and 67, an operation box constituting the control unit CP is provided on the floor near the opening. The control box is equipped with an operation panel, and the operation panel is equipped with an interlocking operation unit (Figure 73), a mode selector switch and a single-acting operation unit (Figure 74), and a control panel (Figure 75) equipped with multiple status lamps that display the operating status. The operation panel is also equipped with an indicator light (not shown) that indicates that the power is ON, and an indicator light (not shown) that indicates whether the operating mode is "interlocking mode" or "single-acting mode". In this embodiment, a maintenance control unit CP' is provided above the opening. The control unit and the maintenance control unit have substantially the same functions (switches), except that the selection of the maintenance mode is possible only on the control unit.

[0184] As shown in Figure 73, the interlocking operation unit according to this embodiment includes a common open switch SU, a close switch SD, and a stop switch SS. Normally, the interlocking mode is selected. In the interlocking mode, when the shutter curtain 1 of the first embodiment is raised and lowered, and when the lower portion 11 of the shutter curtain 1' of the second embodiment is raised and lowered, the first drive unit 6A' and the second drive unit 6B' are operated simultaneously by operation from the interlocking operation unit. When the upper portion 10 (and intermediate portion 12) of the shutter curtain 1' of the second embodiment is raised and lowered, the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' are operated simultaneously by operation from the interlocking operation unit.

[0185] In the first embodiment, when the open switch SU is pressed, the first drive unit 6A' and the second drive unit 6B' operate simultaneously at the same speed, winding up the first wire W1 and the second wire W2 at the same speed, thereby raising the shutter curtain 1 and opening the opening. When the close switch SD is pressed, the first drive unit 6A' and the second drive unit 6B' operate simultaneously at the same speed, unwinding down the first wire W1 and the second wire W2 at the same speed, thereby lowering the shutter curtain 1 and closing the opening. When the stop switch SS is pressed, the operating first drive unit 6A' and the second drive unit 6B' stop simultaneously, stopping the raising and lowering of the first wire W1 and the second wire W2, and stopping the raising and lowering of the shutter curtain 1.

[0186] In the fully closed state of the shutter curtain 1' according to the second embodiment, when the release switch SU of the interlocking operation unit is pressed, the first drive unit 6A' and the second drive unit 6B' operate simultaneously at the same speed, raising the first wire W1 and the second wire W2 simultaneously at the same speed, thereby raising the shutter curtain 1' to an intermediate position and opening the lower part of the opening. In this embodiment, the rising shutter curtain 1' stops at the intermediate position. When the release switch SU of the interlocking operation unit is pressed again, the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' operate simultaneously at the same speed, raising the first wire W1, the second wire W2, and the third wire W3 simultaneously at the same speed, thereby raising the shutter curtain 1' and opening the opening.

[0187] In the fully open state of the shutter curtain 1' according to the second embodiment, when the closing switch SD of the interlocking operation unit is pressed, the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' operate simultaneously at the same speed, causing the first wire W1, the second wire W2, and the third wire W3 to descend simultaneously at the same speed, thereby lowering the shutter curtain 1 to an intermediate position. In this embodiment, the descending shutter curtain 1' stops at the intermediate position. When the closing switch SD of the interlocking operation unit is pressed again, the first drive unit 6A' and the second drive unit 6B' operate simultaneously at the same speed, causing the first wire W1 and the second wire W2 to descend simultaneously at the same speed, thereby lowering the shutter curtain 1' and closing the opening.

[0188] When the stop switch is pressed, the operating first drive unit 6A' and second drive unit 6B' stop simultaneously, stopping the raising and lowering of the first wire W1 and second wire W2, and stopping the raising and lowering of the shutter curtain 1. Alternatively, the operating first drive unit 6A', second drive unit 6B', and third drive unit 6C' stop simultaneously, stopping the raising and lowering of the first wire W1, second wire W2, and third wire W3, and stopping the raising and lowering of the shutter curtain 1.

[0189] As shown in Figure 73, the interlocking control unit is equipped with an emergency stop switch ESS. In the interlocking control unit, the open switch SU, stop switch SS, and close switch SD on the control panel are covered by a cover (not shown), and can be operated by opening the cover. The emergency stop switch ESS is located on the side of the cover and is always operable regardless of whether the cover is open or closed. When the emergency stop switch ESS is pressed, the power supply to the shutter device is disabled or cut off, and all operations of the shutter device stop. The indicator light that shows the power is ON turns off.

[0190] Figure 74 shows the single-acting control unit. The control panel of the single-acting control unit has an operating mode selector switch adjacent to each switch on the single-acting control unit. The operating mode selector switch allows selection of three modes: interlocking mode, single-acting mode, and maintenance mode. Normally, interlocking mode is selected. In the maintenance control unit CP', the operating mode selector switch only allows selection of interlocking mode and single-acting mode. In other words, operation in the maintenance control unit CP' is only possible when the operating mode is selected as maintenance mode on the control unit CP.

[0191] Figure 74 shows the single-acting control unit according to the second embodiment, and corresponding to the first drive unit 6A' (first motor M1), there is an up (pressed all the way) button, a down (pressed all the way) button, and a standalone operation speed selection button. Corresponding to the first drive unit 6A' (first motor M1), there is an up (pressed all the way) button, a down (pressed all the way) button, and a standalone operation speed selection button. Corresponding to the first drive unit 6B' (second motor M2), there is an up (pressed all the way) button, a down (pressed all the way) button, and a standalone operation speed selection button. Corresponding to the first drive unit 6C' (third motor M3), there is an up (pressed all the way) button, a down (pressed all the way) button, and a standalone operation speed selection button. When single-acting mode is selected, the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' can be driven independently and individually by operating their respective switches. In single-acting mode, the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' can be driven individually regardless of the presence or absence of input from the photoelectric sensor OS, the emergency switches EMS1, EMS2, EMS3, and the wire slack detection means WD1, WD2, WD3. The single-acting operation unit is typically used to adjust the height position of the shutter curtain 1' in the width direction. However, if you want to raise or lower the shutter curtain 1' in single-acting mode, you can do so by selecting high speed and simultaneously pressing and holding multiple open switches or multiple close switches.

[0192] In the first embodiment, the single-acting control unit, as shown in Figure 74, lacks the up (press-off) button, down (press-off) button, and independent operating speed selection button corresponding to the first drive unit 6C' (third motor M3). When the single-acting mode is selected, the first drive unit 6A' and the second drive unit 6B' can be driven independently and individually by operating their respective switches.

[0193] Figure 75 shows multiple status lamps indicating the status of the shutter device according to the second embodiment. The three inverter abnormality lamps light up when there is an abnormality in each inverter 1, 2, and 3 (for example, overcurrent or abnormal heat generation). The three overwinding prevention lamps light up when each emergency switch EMS1, EMS2, and EMS3 is activated. The three encoder lamps correspond to each encoder ENC1, ENC2, and ENC3, and when the difference in pulse count exceeds a threshold by the position comparison unit PCU, the lamp corresponding to the encoder outputting the pulse count corresponding to the lowest position lights up. The three wire abnormality lamps correspond to each wire slack detection means WD1, WD2, and WD3, and light up when the wire slack device is activated. The three upper limit LS lamps correspond to each upper limit limit switch LSU1, LSU2, and LSU3, and light up when the upper limit limit switch is detected. The two lower limit LS lamps correspond to the respective lower limit switches LSD1 and LSD2 and illuminate when the lower limit switches are activated. The three intermediate BS lamps correspond to the respective intermediate bottom switches BS1, BS2, and BS3 and illuminate when the respective intermediate bottom switches are activated. The three rising lamps illuminate to indicate that each wire is being wound up by each drive unit. The three descending lamps illuminate to indicate that each wire is being unwound by each drive unit. The photoelectric sensor lamp illuminates when the photoelectric sensor is activated. The maintenance lamp illuminates when maintenance mode is selected. The interlock lamp illuminates when the crane working in the opening is in the designated position. The two bottom lock lamps correspond to the respective bottom lock devices 15 at both ends in the width direction of the lower end of the opening and illuminate when locked. The lamps shown in Figure 75 are illustrative examples, and lamps indicating other states may be provided. Furthermore, it will be understood by those skilled in the art that the conditions for lighting and extinguishing the lamps may be reversed depending on the lamp.Figure 75 shows multiple status lamps indicating the status of the shutter device according to the second embodiment. However, it will be understood by those skilled in the art that by removing all the intermediate BS lamps and the third lamp in Figure 75, multiple status lamps indicating the status of the shutter device according to the first embodiment can be obtained.

[0194] [D] Control Unit [D-1] Control unit according to the first embodiment As shown in Figure 64, the opening and closing operation of the sheet shutter is controlled by the control unit CU. The control unit CU is composed of a computer and includes a processor, memory, input unit, and output unit. The memory stores a program that executes predetermined controls in response to predetermined inputs. Under normal circumstances, the operation mode selector switch is set to interlock mode, and in response to the input of open, close, and stop signals from the interlock operation unit, the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) are driven simultaneously to open and close the shutter curtain 1. When the shutter curtain 1 is raised or lowered, the position of the shutter curtain corresponding to the first drive unit 6A' (first motor M1) is acquired by the first encoder ENC1, and the position of the shutter curtain corresponding to the second drive unit 6B' (second motor M2) is acquired by the second encoder ENC2.

[0195] According to a predetermined program, the rotation speed of the first motor M1 is controlled by inverter 1 according to the position of the shutter curtain 1 detected by the first encoder ENC1, and according to a predetermined program, the rotation speed of the second motor M2 is controlled by inverter 2 according to a predetermined program, according to the position of the shutter curtain 1 detected by the second encoder ENC2. If an abnormality is detected in either inverter, the operation of all drive devices will stop.

[0196] The control unit CU is equipped with a position comparison unit PCU, which receives the first pulse count of the first encoder ENC1 and the second pulse count of the second encoder ENC2 as input. The position comparison unit PCU calculates the difference between the first and second pulse counts, compares this difference with a threshold value stored in the position comparison unit PCU, determines that the operation is normal if the difference is smaller than the threshold value, and determines that the operation is abnormal if the difference is larger than the threshold value. If an abnormality is determined, a predetermined control is performed. In this embodiment, if an abnormality is determined, the driving of the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) is stopped, and the raising and lowering operation of the shutter curtain 1 is stopped. The operation mode is switched to single-acting mode by a mode switching switch, and the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) are operated independently by input from the single-acting operation unit to eliminate the difference in pulse counts.

[0197] If the position comparison unit PCU determines that the operation is normal, the shutter curtain 1 continues to move upward or downward. During the upward operation, the first drive unit 6A' (first motor M1) stops driving upon detection by the first upper limit switch LSU1, and the second drive unit 6B' (first motor M1) stops driving upon detection by the second upper limit switch LSU2.

[0198] When the shutter curtain 1 is raised, its position is monitored by the first encoder ENC1 and the second encoder ENC2. When the part of the shutter curtain 1 corresponding to the first drive unit 6A' (first motor M1) rises beyond the detection position of the first upper limit switch LSU1, the first drive unit 6A' (first motor M1) is stopped according to a preset number of pulses from the first encoder ENC1. When the part of the shutter curtain 1 corresponding to the second drive unit 6B' (second motor M2) rises beyond the detection position of the second upper limit switch LSU2, the second drive unit 6B' (second motor M2) is stopped according to a preset number of pulses from the second encoder ENC2.

[0199] When the part of the shutter curtain 1 corresponding to the first drive unit 6A' (first motor M1) rises above the upper limit position set by the number of pulses of the first encoder ENC1, the first emergency switch EMS1 is activated, stopping the first drive unit 6A' (first motor M1) and, if in operation, the second drive unit 6B' (second motor M2). When the part of the shutter curtain 1 corresponding to the second drive unit 6B' (second motor M2) rises above the upper limit position set by the number of pulses of the second encoder ENC2, the second emergency switch EMS2 is activated, stopping the second drive unit 6B' (second motor M2) and, if in operation, the first drive unit 6A' (first motor M1).

[0200] During the downward movement, detection by the first lower limit switch LSD1 disables the first wire slack detection means WD1 corresponding to the first drive unit 6A' (first motor M1), and detection by the second lower limit switch LSD2 disables the second wire slack detection means WD2 corresponding to the second drive unit 6B' (first motor M1). When the shutter curtain 1 is lowering, its position is monitored by the first encoder ENC1 and the second encoder ENC2. The lower limit position based on the first encoder ENC1 and the lower limit position based on the second encoder ENC2 are located below the lower limit position of the first lower limit switch LSD1 and the lower limit position of the second lower limit switch LSD2, respectively. Detection of the lower limit position by the first encoder ENC1 stops the drive of the first drive unit 6A' (first motor M1), and detection of the lower limit position by the second encoder ENC2 stops the drive of the second drive unit 6B' (first motor M1). At the lower limit stopping position of the shutter curtain 1, the first wire slack detection means WD1 and the second wire slack detection means WD2 are disabled, so in the fully closed position, it is permissible for the first wire W1 and the second wire W2 to be somewhat slack. This prevents the first wire W1 and the second wire W2 from being taut in the fully closed position, and even if a strong wind blows and the shutter curtain 1 shakes in the fully closed position, the first wire W1 and the second wire W2 will not be subjected to great tension, thereby improving the durability of the first wire W1 and the second wire W2.

[0201] When the photoelectric sensor OS detects an obstacle while the shutter curtain 1 is descending, the raising and lowering operation of the shutter curtain 1' is stopped. In one embodiment, if the obstacle is removed after detection by the photoelectric sensor OS, operation from the interlocking operation unit is possible. When the first wire slack detection means WD1 detects slack in the first wire W1, or when the second wire slack detection means WD2 detects slack in the second wire W2, the raising and lowering operation of the shutter curtain 1 is stopped. In one embodiment, after detection by the first wire slack detection means WD1 and the second wire slack detection means WD2, operation from the interlocking operation unit is disabled, and the position adjustment or raising and lowering of the shutter curtain 1 is performed by operation from the single-acting operation unit. When the locking device 15 is in the locked state, the detection switch MS is in the OFF state, and when the detection switch MS is in the OFF state, the electric opening and closing of the shutter curtain 1 is disabled. In addition, in single-acting mode, a reset means is provided to reset the pulse count of each encoder when the shutter curtain 1 is in the fully closed position. In this embodiment, the single-acting operation unit is reset by pressing and holding the stop button, but the reset button is not limited to the stop button. In this embodiment, the pulse count is reset to 0 when the shutter curtain 1 is in the fully closed position (detection state of the first lower limit switch LSD1, detection state of the second lower limit switch LSD2), but the encoder pulse count is not necessarily limited to the fully closed position, as long as it is reset at a predetermined open / closed position set in advance.

[0202] [D-2] Control Unit According to the Second Embodiment As shown in Figure 68, the opening and closing operation of the sheet shutter is controlled by the control unit CU. The control unit CU is composed of a computer and includes a processor, memory, input unit, and output unit. The memory stores a program that executes predetermined controls in response to predetermined inputs. Under normal circumstances, the operation mode selector switch is set to interlock mode, and in response to the input of open, close, and stop signals from the interlock operation unit, the first drive unit 6A' (first motor M1), the second drive unit 6B' (second motor M2), and the third drive unit 6C' (third motor M3) are driven simultaneously, or the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) are driven simultaneously, causing the shutter curtain 1' to open and close. When the shutter curtain 1' is raised or lowered, the position of the shutter curtain corresponding to the first drive unit 6A' (first motor M1) is obtained by the first encoder ENC1, the position of the shutter curtain corresponding to the second drive unit 6B' (second motor M2) is obtained by the second encoder ENC2, and the position of the shutter curtain corresponding to the third drive unit 6C' (third motor M3) is obtained by the third encoder ENC3.

[0203] According to a predetermined program, the rotation speed of the first motor M1 is controlled by inverter 1 according to the position of the shutter curtain 1 detected by the first encoder ENC1; according to a predetermined program, the rotation speed of the second motor M2 is controlled by inverter 2 according to the position of the shutter curtain 1 detected by the second encoder ENC2; and according to a predetermined program, the rotation speed of the third motor M3 is controlled by inverter 3 according to a predetermined program. If an abnormality is detected in any of the inverters, the operation of all drive devices will stop.

[0204] The control unit CU is equipped with a position comparison unit PCU, which receives the pulse counts of the first encoder ENC1, the second encoder ENC2, and the third encoder ENC3 as input. When the lower part 11 of the shutter curtain 1' is raised or lowered, the position comparison unit PCU calculates the difference between the first pulse count and the second pulse count, compares this difference with a threshold stored in the position comparison unit PCU, determines that it is normal if the difference is smaller than the threshold, and determines that it is abnormal if the difference is larger than the threshold. When the upper part 10 of the shutter curtain 1' is raised or lowered, the position comparison unit PCU calculates the difference between the first pulse count and the second pulse count, the difference between the first pulse count and the third pulse count, and the difference between the second pulse count and the third pulse count, compares each pulse count difference with a threshold stored in the position comparison unit PCU, determines that it is normal if all pulse count differences are smaller than the threshold, and determines that it is abnormal if any pulse count difference is larger than the threshold.

[0205] If an abnormality is detected, a predetermined control is performed. In this embodiment, if an abnormality is detected, the driving of all drive devices is stopped, and the raising and lowering operation of the shutter curtain 1' is stopped. Specifically, if the first drive device 6A' (first motor M1) and the second drive device 6B' (second motor M2) are being driven, the driving of the first drive device 6A' (first motor M1) and the second drive device 6B' (second motor M2) is stopped. If the first drive device 6A' (first motor M1), the second drive device 6B' (second motor M2) and the third drive device 6C' (third motor M3) are being driven, the driving of the first drive device 6A' (first motor M1), the second drive device 6B' (second motor M2) and the third drive device 6C' (third motor M3) is stopped. A mode selector switch allows the operating mode to be switched to single-acting mode, and by input from the single-acting control unit, the first drive unit 6A' (first motor M1), the second drive unit 6B' (second motor M2), or the first drive unit 6A' (first motor M1), the second drive unit 6B' (second motor M2), and the third drive unit 6C' (third motor M3) are operated independently, thereby eliminating differences in the number of pulses.

[0206] If the position comparison unit PCU determines that the operation is normal, the shutter curtain 1' continues to move upward or downward. When the shutter curtain 1' (upper part 10) moves upward, the first drive unit 6A' (first motor M1) stops driving upon detection by the first upper limit switch LSU1, the second drive unit 6B' (first motor M1) stops driving upon detection by the second upper limit switch LSU2, and the third drive unit 6C' (third motor M3) stops driving upon detection by the third upper limit switch LSU3.

[0207] When the shutter curtain 1' is raised, its position is monitored by the first encoder ENC1, the second encoder ENC2, or the first encoder ENC1, the second encoder ENC2, and the third encoder ENC3. When the part of the shutter curtain 1' corresponding to the first drive unit 6A' (first motor M1) rises beyond the detection position of the first upper limit switch LSU1, the first drive unit 6A' (first motor M1) is stopped according to a preset number of pulses from the first encoder ENC1. When the part of the shutter curtain 1' corresponding to the second drive unit 6B' (second motor M2) rises beyond the detection position of the second upper limit switch LSU2, the second drive unit 6B' (second motor M2) is stopped according to a preset number of pulses from the second encoder ENC2. When the part of the shutter curtain 1' corresponding to the third drive unit 6C' (third motor M3) rises beyond the detection position of the second upper limit switch LSU3, the third drive unit 6C' (third motor M3) is stopped according to the number of pulses of the third encoder ENC3 which has been set in advance.

[0208] When the part of the shutter curtain 1' corresponding to the first drive unit 6A' (first motor M1) rises above the upper limit position set by the number of pulses of the first encoder ENC1, the first emergency switch EMS1 is activated, stopping the drive unit in operation, including the first drive unit 6A' (first motor M1). When the part of the shutter curtain 1' corresponding to the second drive unit 6B' (second motor M2) rises above the upper limit position set by the number of pulses of the second encoder ENC2, the second emergency switch ENS2 is activated, stopping the drive unit 6B' in operation, including the second drive unit 6B' (second motor M2). When the part of the shutter curtain 1' corresponding to the third drive unit 6C' (third motor M3) rises above the upper limit position set by the number of pulses of the third encoder ENC3, the third emergency switch EMS3 is activated, stopping the drive unit in operation, including the third drive unit 6C' (third motor M3).

[0209] When the shutter curtain 1' (lower part 11) rises from the fully closed position, if the part of the shutter curtain 1' corresponding to the first drive unit 6A' (first motor M1) rises to the intermediate position, the first drive unit 6A' (first motor M1) is stopped according to a preset number of pulses from the first encoder ENC1. If the part of the shutter curtain 1' corresponding to the second drive unit 6B' (second motor M2) rises to the intermediate position, the second drive unit 6B' (second motor M2) is stopped according to a preset number of pulses from the second encoder ENC2. By pressing the release switch SU on the interlocking operation unit, the shutter curtain 1' that has stopped at the intermediate position is raised by the first drive unit 6A' (first motor M1), the second drive unit 6B' (second motor M2), and the third drive unit 6C' (third motor M3).

[0210] During the downward operation, when the shutter curtain 1' (upper part 10) has descended to the intermediate position, the first intermediate bottom switch BS1 corresponding to the first drive unit 6A' (first motor M1) detects the movement and stops the drive of the first drive unit 6A' (first motor M1), the second intermediate bottom switch BS2 corresponding to the second drive unit 6B' (second motor M2) detects the movement and stops the drive of the second drive unit 6B' (first motor M1), and the third intermediate bottom switch BS3 corresponding to the third drive unit 6C' (third motor M3) detects the movement and stops the drive of the third drive unit 6C' (third motor M3). By pressing the closing switch SD on the interlocking operation unit, the shutter curtain 1', which has stopped at the intermediate position, will descend again by the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2).

[0211] Upon detection by the first lower limit switch LSD1, the first wire slack detection means corresponding to the first drive unit 6A' (first motor M1) is deactivated, and upon detection by the second lower limit switch LSD2, the second wire slack detection means corresponding to the second drive unit 6B' (second motor M2) is deactivated. When the shutter curtain 1 is lowering, its position is monitored by the first encoder ENC1 and the second encoder ENC2, and the lower limit position based on the first encoder ENC1 and the lower limit position based on the second encoder ENC2 are located below the lower limit position of the first lower limit switch LSD1 and the lower limit position of the second lower limit switch LSD2, respectively. Upon detection of the lower limit position by the first encoder ENC1, the drive of the first drive unit 6A' (first motor M1) is stopped, and upon detection of the lower limit position by the second encoder ENC2, the drive of the second drive unit 6B' (second motor M2) is stopped.

[0212] When the photoelectric sensor OS detects an obstacle, the raising and lowering operation of the shutter curtain 1' is stopped. When the first wire slack detection means WD1 detects slack in the first wire W1, or when the second wire slack detection means WD2 detects slack in the second wire W2, or when the third wire slack detection means WD3 detects slack in the third wire W3, the raising and lowering operation of the shutter curtain 1' is stopped. When the locking device 15 is in the locked state, the detection switch MS is in the OFF state, and when the detection switch MS is in the OFF state, the electric opening and closing of the shutter curtain 1' is disabled. In addition, in single-act mode, a reset means is provided to reset the pulse count of each encoder when the shutter curtain 1' is in the fully closed position. In this embodiment, the reset is performed by long-pressing the stop button on the single-act operation unit, but the reset button is not limited to the stop button. In this embodiment, the pulse count is reset to 0 when the shutter curtain 1' is in the fully closed position. If the encoder pulse count is reset at a predetermined open / closed position, it is not necessarily limited to the fully closed position.

[0213] [E] Shutter opening and closing operation [E-1] Opening and closing operation of the shutter according to the first embodiment [E-1-1] Opening operation Referring to Figure 65, the process from the fully closed position to the fully open position of the shutter curtain 1 will be explained. Assuming the bottom lock is released, pressing the release switch SU on the interlocking operation unit activates the first drive unit 6A' and the second drive unit 6B', causing the shutter curtain 1 to rise. When either the first wire slack detection means WD1 or the second wire slack detection means WD2 detects wire slack, the control unit CU, which receives the wire slack detection signal, determines that an abnormal condition exists, stops the driving of the first drive unit 6A' and the second drive unit 6B', and stops the rising of the shutter curtain 1.

[0214] When the shutter curtain rises, the pulse counts of the first encoder ENC1 and the second encoder ENC2 are constantly input to the control unit CU, the difference in pulse counts is calculated and compared with a threshold. If the difference in pulse counts is greater than the threshold, the control unit CU determines that an abnormal condition has occurred, the first drive unit 6A' and the second drive unit 6B' are stopped, and the rising of the shutter curtain 1 stops. Details of the processing steps after the rising of the shutter curtain 1 stops will be described later.

[0215] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that it is in a normal state, and the shutter curtain 1 continues to rise. When the first upper limit switch LSU1 detects a problem, the first drive unit 6A' stops driving, and when the second upper limit switch LSU2 detects a problem, the second drive unit 6B' stops driving, the rising of the shutter curtain 1 stops, and the opening becomes fully open.

[0216] When the shutter curtain 1 rises beyond the detection position of the first upper limit switch LSU1, the first drive unit 6A' (first motor M1) is stopped according to a preset number of pulses from the first encoder ENC1. When the shutter curtain 1 rises beyond the detection position of the second upper limit switch LSU2, the second drive unit 6B' (second motor M2) is stopped according to a preset number of pulses from the second encoder ENC2. This stops the rising of the shutter curtain 1, and the opening is fully open.

[0217] When the shutter curtain 1 rises above the upper limit position set by the number of pulses of the first encoder ENC1, the first emergency switch EMS1 is activated, stopping the first drive unit 6A' (first motor M1) and, if in operation, the second drive unit 6B' (second motor M2). When the shutter curtain 1 rises above the upper limit position set by the number of pulses of the second encoder ENC2, the second emergency switch EMS2 is activated, stopping the second drive unit 6B' (second motor M2) and, if in operation, the first drive unit 6A' (first motor M1).

[0218] [E-1-2] Closing operation Referring to Figure 66, the process from the fully open position to the fully closed position of the shutter curtain 1 will be explained. Assuming the bottom lock is released, pressing the closing switch SD on the interlocking operation unit activates the first drive unit 6A' and the second drive unit 6B', causing the shutter curtain 1 to descend. When either the first wire slack detection means WD1 or the second wire slack detection means WD2 detects wire slack, the control unit CU, which receives the wire slack detection signal, determines that an abnormal condition exists, stops the driving of the first drive unit 6A' and the second drive unit 6B', and stops the descent of the shutter curtain 1.

[0219] When the shutter curtain is lowering, the pulse counts of the first encoder ENC1 and the second encoder ENC2 are constantly input to the control unit CU, the difference in pulse counts is calculated and compared with a threshold. If the difference in pulse counts is greater than the threshold, the control unit CU determines that an abnormal state has occurred, the first drive unit 6A' and the second drive unit 6B' are stopped, and the lowering of the shutter curtain 1 stops. Details of the processing steps after the lowering of the shutter curtain 1 stops will be described later.

[0220] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that it is in a normal state, and the shutter curtain 1 continues to descend. If the photoelectric sensor OS turns ON while the shutter curtain is descending, the control unit CU determines that it is in an abnormal state, the first drive unit 6A' and the second drive unit 6B' are stopped, and the descent of the shutter curtain 1 stops. When the obstacle is removed and the photoelectric sensor OS turns OFF, pressing the closing switch SD again will cause the shutter curtain 1 to descend again. When the first lower limit switch LSD1 detects something, the first wire slack detection means WD1 is disabled, and when the second lower limit switch LSD2 detects something, the second wire slack detection means WD2 is disabled.

[0221] The lower limit positions based on the first encoder ENC1 and the lower limit positions based on the second encoder ENC2 are each located below the lower limit position of the first lower limit switch LSD1 and the lower limit position of the second lower limit switch LSD2. When the lower limit position is detected by the first encoder ENC1, the drive of the first drive device 6A´ (the first motor M1) stops. When the lower limit position is detected by the second encoder ENC2, the drive of the second drive device 6B´ (the first motor M1) stops, and the opening is in a fully closed state.

[0222] Note that when the shutter curtain 1 descends below the lower limit position based on the first encoder ENC1 or the lower limit position based on the second encoder ENC2 without invalidating the first wire slack detection means WD1 and the second wire slack detection means WD2, the first wire slack detection means WD1 or the second wire slack detection means WD2 may be activated to stop the driving device that is in operation. In this mode, the first wire slack detection means WD1 or the second wire slack detection means WD2 will function as a kind of emergency switch on the lower end side.

[0223] [E-2] Opening and closing operation of the shutter according to the second embodiment [E-2-1] Opening operation (from the fully closed position to the intermediate position) While referring to FIGS. 69 and 70, the flow until the shutter curtain 1´ changes from the fully closed position to the fully open position will be described. On the condition that the bottom lock is released, by pressing the open switch SU of the interlocking operation unit, the first drive device 6A´ and the second drive device ól6B´ operate, and the shutter curtain 1´ ascends. When either the first wire slack detection means WD1 or the second wire slack detection means WD2 detects wire slack, the control unit CU that has received the wire slack detection signal determines an abnormal state, stops the drives of the first drive device 6A´ and the second drive device 6B´, and stops the ascent of the shutter curtain 1´.

[0224] When the shutter curtain ' rises, the pulse counts of the first encoder ENC1 and the second encoder ENC2 are constantly input to the control unit CU, the difference in pulse counts is calculated and compared with a threshold. If the difference in pulse counts is greater than the threshold, the control unit CU determines that an abnormal condition has occurred, the first drive unit 6A' and the second drive unit 6B' are stopped, and the rising of the shutter curtain 1' stops. Details of the processing steps after the rising of the shutter curtain 1' stops will be described later.

[0225] When the difference in the number of pulses is smaller than a threshold, the control unit CU determines that it is in a normal state, and the shutter curtain 1' continues to rise. When the shutter curtain 1' rises to an intermediate position determined by the number of pulses of the first encoder ENC1 and the number of pulses of the second encoder ENC2, the first drive unit 6A' stops when a predetermined number of pulses of the first encoder ENC1 is input to the control unit CU, and the second drive unit 6B' stops when a predetermined number of pulses of the second encoder ENC2 is input to the control unit CU. [E-2-2] Release operation (from intermediate position to fully open position) Provided the bottom lock is released, pressing the release switch SU on the interlocking operation unit activates the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C', causing the shutter curtain 1' to rise. If any of the first wire slack detection means WD1, the second wire slack detection means WD2, or the third wire slack detection means WD3 detects wire slack, the control unit CU, which receives the wire slack detection signal, determines that an abnormal condition exists, stops the operation of the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C', and stops the rising of the shutter curtain 1'.

[0226] When the shutter curtain 1' is raised, the pulse counts of the first encoder ENC1, the second encoder ENC2, and the third encoder ENC3 are constantly input to the control unit CU. The difference in pulse counts is calculated and compared with a threshold. Here, the difference between the pulse counts of the first encoder ENC1 and the second encoder ENC2, the difference between the pulse counts of the first encoder ENC1 and the third encoder ENC3, and the difference between the pulse counts of the second encoder ENC2 and the third encoder ENC3 are calculated. If any of the pulse count differences are greater than the threshold, the control unit CU determines that an abnormal condition has occurred, and the driving of the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' is stopped, and the raising of the shutter curtain 1' stops. Details of the processing steps after the raising of the shutter curtain 1' stops will be described later.

[0227] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that it is in a normal state, and the shutter curtain 1' continues to rise. When the first upper limit switch LSU1 detects a problem, the first drive unit 6A' stops driving; when the second upper limit switch LSU2 detects a problem, the second drive unit 6B' stops driving, and the rising of the shutter curtain 1 stops; and when the third upper limit switch LSU3 detects a problem, the third drive unit 6C' stops driving, and the rising of the shutter curtain 1' stops, resulting in the opening being fully open.

[0228] When the shutter curtain 1' rises beyond the detection position of the first upper limit switch LSU1, the first drive unit 6A' (first motor M1) is stopped according to a preset number of pulses from the first encoder ENC1. When the shutter curtain 1' rises beyond the detection position of the second upper limit switch LSU2, the second drive unit 6B' (second motor M2) is stopped according to a preset number of pulses from the second encoder ENC2. When the shutter curtain 1' rises beyond the detection position of the third upper limit switch LSU3, the third drive unit 6C' (third motor M3) is stopped according to a preset number of pulses from the third encoder ENC3. As a result, the rising of the shutter curtain 1' is stopped, and the opening is fully open.

[0229] When the shutter curtain 1' rises above the upper limit position set by the number of pulses of the first encoder ENC1, the first emergency switch EMS1 is activated, stopping the first drive unit 6A' (first motor M1), and, if in operation, the second drive unit 6B' (second motor M2) and the third drive unit 6C' (third motor M3). When the shutter curtain 1' rises above the upper limit position set by the number of pulses of the second encoder ENC2, the second emergency switch EMS2 is activated, stopping the second drive unit 6B' (second motor M2), and, if in operation, the first drive unit 6A' (first motor M1) and the third drive unit 6C' (third motor M3). When the shutter curtain 1' rises above the upper limit position set by the number of pulses of the third encoder ENC3, the third emergency switch EMS3 is activated, stopping the third drive unit 6C' (third motor M3), and, if in operation, the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2).

[0230] [E-2-3] Closing operation (from fully open to intermediate position) Referring to Figures 71 and 72, the process from the fully open position to the fully closed position of the shutter curtain 1 will be explained. Provided that the bottom lock is released, pressing the closing switch SD on the interlocking operation unit activates the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C', causing the shutter curtain 1' to descend. If any of the first wire slack detection means WD1, the second wire slack detection means WD2, or the third wire slack detection means WD3 detects wire slack, the control unit CU, which receives the wire slack detection signal, determines that an abnormal condition exists, and the driving of the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' is stopped, and the descent of the shutter curtain 1' stops.

[0231] When the shutter curtain 1' is descending, the pulse counts of the first encoder ENC1, the second encoder ENC2, and the third encoder ENC3 are constantly input to the control unit CU. The difference in pulse counts is calculated and compared with a threshold. Here, the difference between the pulse counts of the first encoder ENC1 and the second encoder ENC2, the difference between the pulse counts of the first encoder ENC1 and the third encoder ENC3, and the difference between the pulse counts of the second encoder ENC2 and the third encoder ENC3 are calculated. If any of the pulse count differences are greater than the threshold, the control unit CU determines that an abnormal condition has occurred, and the driving of the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' is stopped, and the descent of the shutter curtain 1' stops. Details of the processing steps after the descent of the shutter curtain 1 stops will be described later.

[0232] When the difference in the number of pulses is less than the threshold, the control unit CU determines that it is in a normal state, and the shutter curtain 1' continues to descend. If the photoelectric sensor OS turns ON while the shutter curtain 1' is descending, the control unit CU determines that it is in an abnormal state, and the drives of the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C' are stopped, and the descent of the shutter curtain 1' stops. Once the obstacle is removed and the photoelectric sensor OS turns OFF, pressing the close switch SD again will cause the shutter curtain 1' to descend again.

[0233] When the shutter curtain 1' descends to the intermediate position, the intermediate bottom switch is activated. Detection by the first intermediate bottom switch BS1 stops the drive of the first drive unit 6A', detection by the second intermediate bottom switch BS2 stops the drive of the second drive unit 6B', and detection by the third intermediate bottom switch BS3 stops the drive of the third drive unit 6C'.

[0234] [E-2-4] Closing operation (from intermediate position to fully closed position) Provided the bottom lock is released, pressing the closing switch SD on the interlocking operation unit activates the first drive unit 6A' and the second drive unit 6B', causing the shutter curtain 1' to descend again. If either the first wire slack detection means WD1 or the second wire slack detection means WD2 detects wire slack, the control unit CU, which receives the wire slack detection signal, determines that an abnormal condition exists, stops the driving of the first drive unit 6A' and the second drive unit 6B', and stops the descent of the shutter curtain 1'.

[0235] When the shutter curtain 1' is descending, the pulse counts of the first encoder ENC1 and the second encoder ENC2 are constantly input to the control unit CU, the difference in pulse counts is calculated and compared with a threshold. If the difference in pulse counts is greater than the threshold, the control unit CU determines that an abnormal condition exists, the first drive unit 6A' and the second drive unit 6B' are stopped, and the descent of the shutter curtain 1' stops. Details of the processing steps after the descent of the shutter curtain 1' stops will be described later.

[0236] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that it is in a normal state, and the shutter curtain 1' continues to descend. If the photoelectric sensor OS turns ON while the shutter curtain is descending, the control unit CU determines that it is in an abnormal state, the first drive unit 6A' and the second drive unit 6B' are stopped, and the descent of the shutter curtain 1' stops. When the obstacle is removed and the photoelectric sensor OS turns OFF, pressing the closing switch SD again will cause the shutter curtain 1' to descend again. When the first lower limit switch LSD1 detects something, the first wire slack detection means WD1 is disabled, and when the second lower limit switch LSD2 detects something, the second wire slack detection means WD2 is disabled.

[0237] The lower limit positions determined by the first encoder ENC1 and the second encoder ENC2 are located below the lower limit positions of the first lower limit switch LSD1 and the second lower limit switch LSD2, respectively. When the lower limit position is detected by the first encoder ENC1, the first drive unit 6A' (first motor M1) stops driving, and when the lower limit position is detected by the second encoder ENC2, the second drive unit 6B' (second motor M2) stops driving, resulting in a fully closed opening.

[0238] Furthermore, if the shutter curtain 1' descends below the lower limit position based on the first encoder ENC1 or the second encoder ENC2 without disabling the first wire slack detection means WD1 and the second wire slack detection means WD2, the first wire slack detection means WD1 or the second wire slack detection means WD2 may be activated to stop the drive device that is currently in operation.

[0239] [E-3] Control based on abnormality detection in the position comparison unit Referring to Figure 76, the control based on abnormality detection by the position comparison unit PCU will be explained. When the shutter curtain 1 is raised or lowered in the interlocking mode, the position comparison unit PCU compares the number of pulses from the encoders corresponding to each drive device, and the difference in the number of pulses is compared with a predetermined threshold stored in memory. If the difference in the number of pulses is smaller than the threshold, it is determined to be a normal state, and the shutter curtain 1 continues to raise or lower.

[0240] When the difference in the number of pulses calculated by the position comparison unit PCU is greater than the threshold, all drive devices currently in operation stop. In this embodiment, the lamp of the encoder outputting the value corresponding to the lowest position (see Figure 75) lights up. The motion mode selector switch is switched from linked mode to single-acting mode. When single-acting mode is selected, the wire slack detection means is disabled. The shutter curtain position is adjusted by fully pressing the up button corresponding to the lit encoder until the light turns off (the difference in the number of pulses of each encoder falls within the threshold).

[0241] In the operation mode switching switch, switch from the single - action mode to the inter - lock mode. In the inter - lock operation unit, by pressing the open button or the close button, the shutter curtain rises or falls. For the subsequent operation flow, refer to FIGS. 65, 66, 69 to 72.

[0242] In this embodiment, the lamp of the encoder that outputs the value corresponding to the lowest position is lit. However, the lamp of the encoder that outputs the value corresponding to the highest position may be lit, and adjustment may be performed using the down button. In this embodiment, when the difference in the number of pulses exceeds the threshold, the operation of the shutter curtain is stopped, and the inclination of the shutter curtain is manually adjusted by the single - action operation unit. However, information when the difference in the number of pulses exceeds the threshold is input to the control unit CU, and the control unit CU causes the inverter corresponding to the selected drive device to increase or decrease the rotational speed of the selected drive device compared to the rotational speeds of the other drive devices so as to match the number of pulses corresponding to the plurality of drive devices being driven simultaneously (control so that the difference in the number of pulses falls within the threshold), thereby automatically adjusting the inclination of the shutter curtain.

[0243] [Appendix 1] [Concept 1] A plurality of drive devices, A plurality of wires wound and paid out by each drive device, A shutter curtain connected to the plurality of wires and moving up and down by winding and paying out the plurality of wires to open and close an opening, Control means for controlling the opening and closing operation of the shutter curtain, A shutter device comprising: Each drive device is provided with opening - and - closing position detection means for detecting the opening and closing position of the shutter curtain, respectively. Position comparison means for comparing the opening and closing positions detected by each opening - and - closing position detection means, Judgment means for judging the normal or abnormal state of the opening and closing operation based on the comparison result obtained by the position comparison means, A shutter device comprising the above. [Concept 2] The control means controls the opening and closing operation of the shutter curtain based on the determination result of the determination means. A shutter device as described in Concept 1. [Concept 3] Each drive unit is provided with an upper limit position detection means for detecting the upper limit position of the shutter curtain and a lower limit position detection means for detecting the lower limit position. The control means controls each drive device based on the detection of each upper limit position detection means and the detection of each lower limit position detection means. A shutter device as described in either Concept 1 or 2. [Concept 4] Each drive unit is equipped with a wire slack detection means that detects the slack in each wire. The control means stops all operating drive devices when at least one of the wire slack detection means detects slack. A shutter device as described in either Concept 1 or 2. [Concept 5] An emergency switch is provided for each drive unit, which operates at a position above the upper limit position. The control means stops all operating drive devices in response to the detection of at least one emergency switch. A shutter device as described in Concept 3.

[0244] [Note 2] [Concept 1] Multiple drive units, Multiple wires are wound up and unwound by each drive unit, A shutter curtain connected to the aforementioned multiple wires, which moves up and down to open and close the opening by winding and unwinding the aforementioned multiple wires, Control means for controlling the opening and closing operation of the shutter curtain, In a shutter device equipped with, An upper limit position detection mechanism that detects the upper limit position of the shutter curtain, A lower limit position detection mechanism is provided to detect the lower limit position of the shutter curtain. The shutter device comprises, for each of the upper limit position detection mechanism and the lower limit position detection mechanism, a first detection means for mechanically detecting the position of the shutter curtain and a second detection means for electrically detecting the position of the shutter curtain. [Concept 2] The upper limit position detection mechanism and the lower limit position detection mechanism are provided in accordance with each drive unit. A shutter device as described in Concept 1. [Concept 3] In the aforementioned upper limit position detection mechanism, The first detection means detects the first upper limit position, The second detection means detects a second upper limit position that is above the first upper limit position, An emergency switch is provided for each drive unit, which operates above the second upper limit position. A shutter device as described in Concept 2. [Concept 4] In the lower limit position detection mechanism, The first detection means detects the first lower limit position, The second detection means detects a second lower limit position that is lower than the first lower limit position, Each drive unit is equipped with a wire slack detection means for detecting slack in the corresponding wire. In response to the detection by the first detection means, the corresponding wire slack detection means is disabled. In response to the detection by the second detection means, the corresponding drive device is stopped. A shutter device as described in Concept 2. [Concept 5] In the lower limit position detection mechanism, The first detection means detects the first lower limit position, The second detection means detects a second lower limit position that is lower than the first lower limit position, Each drive unit is equipped with a wire slack detection means for detecting slack in the corresponding wire. The system is designed to stop all operating drive devices in response to detection by any of the wire slack detection means. The wire slack detection means operates below the second lower limit position. A shutter device as described in Concept 2.

[0245] [Note 3] [Concept 1] Multiple drive units, Multiple wires are wound up and unwound by each drive unit, A shutter curtain connected to the aforementioned multiple wires, which moves up and down to open and close the opening by winding and unwinding the aforementioned multiple wires, Control means for controlling the opening and closing operation of the shutter curtain, In a shutter device equipped with, The control means includes an interlocking mode in which the multiple drive devices operate simultaneously, and a single-acting mode in which each drive device operates individually. Shutter device. [Concept 2] It has separate control units for linked operation mode and single operation mode. A shutter device as described in Concept 1. [Concept 3] It is equipped with a mode selector switch, which allows switching between interlocked mode and single-acting mode. A shutter device as described in either Concept 1 or 2. [Concept 4] Each drive unit, in interlocking mode, is equipped with an opening / closing position detection means that detects the opening and closing position of the shutter curtain in accordance with each drive unit. The control means is In the interlocking mode, the opening and closing operation of the shutter curtain is stopped based on the comparison result of the opening and closing positions detected by each opening and closing position detection means. In single-acting mode, the single-acting control unit adjusts the position of the shutter curtain corresponding to each drive unit. A shutter device as described in Concept 2. [Concept 5] It is equipped with a control panel that displays the operating status of the shutter curtain, The control panel displays the drive unit to be adjusted by the single-acting control unit. A shutter device as described in Concept 4. [Concept 6] A first operating device is provided below the opening, which includes the interlocking operation unit, the single-acting operation unit, and the changeover switch. A second operating device, including the interlocking operation unit, the single-acting operation unit, and the changeover switch, is provided above the aforementioned opening. The changeover switch on the first operating device allows for the selection of a maintenance mode. When the maintenance mode is selected, the operation of the second operating device becomes possible. A shutter device as described in Concept 3. [Concept 7] The opening / closing position detection means is an encoder, In single-acting mode, it is equipped with a reset means for resetting the number of encoder pulses at a predetermined open / closed position set in advance. A shutter device as described in Concept 4.

[0246] [Note 4] [Concept 1] Multiple drive units, Multiple wires are wound up and unwound by each drive unit, A shutter curtain connected to the aforementioned multiple wires, which moves up and down to open and close the opening by winding and unwinding the aforementioned multiple wires, Control means for controlling the opening and closing operation of the shutter curtain, In a shutter device equipped with, Each drive unit is equipped with an opening / closing position detection means for detecting the opening and closing position of the shutter curtain. The opening / closing position detection means includes an intermediate position detection means for detecting an intermediate position between the upper limit position and the lower limit position. Based on the detection of the intermediate position detecting means during the opening and closing operation of the shutter curtain, the control means controls the opening and closing operation of the shutter curtain by increasing or decreasing the number of driving devices. Shutter device. [Concept 2] Equipped with N driving devices, when the shutter curtain is at the lower limit position to the intermediate position, it is opened and closed by n (n < N) driving devices, and when the shutter curtain is at the intermediate position to the upper limit position, it is opened and closed by N driving devices. The shutter device according to Concept 1. [Concept 3] The control means stops the opening and closing operation of the shutter curtain in response to the detection of the intermediate position. The shutter device according to Concept 1. [Concept 4] The intermediate position detecting means Mechanical detecting means for detecting the intermediate position when the shutter curtain descends, and Electrical detecting means for detecting the intermediate position when the shutter curtain ascends, and is provided with. The shutter device according to any one of Concepts 1 to 3. Explanation of compliance

[0247] 1 Shutter curtain (First embodiment) 1´ Shutter curtain (Second embodiment) 6A´ First driving device 6B´ Second driving device 6C´ Third driving device CU Control unit CP Operation unit SU Release switch SD Closing switch SS Stop switch PCU Position comparison unit EMS1 First emergency switch EMS2 Second emergency switch EMS3 Third emergency switch ENC1 First encoder (opening and closing position detecting means) ENC2 Second encoder (opening and closing position detecting means) ENC3 Third encoder (open / closed position detection means) WD1 First wire slack detection means WD2 Second wire slack detection means WD3 Third wire slack detection means LSU1 First Upper Limit Switch LSU2 Second Upper Limit Switch LSU3 Third Upper Limit Switch LSD1 1st Lower Limit Switch LSD2 Second Lower Limit Switch BS1 1st Intermediate Bottom Switch BS2 2nd Intermediate Bottom Switch BS3 Third Intermediate Bottom Switch 15 Locking device W1 First wire W2 Second wire W3 Third Wire

Claims

1. N drive units, Multiple wires are wound up and unwound by each of the N drive units, A shutter curtain connected to the aforementioned multiple wires, which moves up and down to open and close the opening by winding and unwinding the aforementioned multiple wires, Control means for controlling the opening and closing operation of the shutter curtain, In a shutter device equipped with, The aforementioned opening has a width dimension at the top that is larger than the width dimension at the bottom, with the midpoint in the height direction as the dividing line. The shutter curtain has an upper portion and a lower portion corresponding to the opening, with the upper portion having a width dimension that is greater than the width dimension of the lower portion. The intermediate position of the shutter curtain is defined as the point where the lower end of the lower portion of the shutter curtain is located at the midpoint in the height direction. Each drive unit is equipped with an opening / closing position detection means for detecting the opening and closing position of the shutter curtain. The opening / closing position detection means includes an intermediate position detection means for detecting when the shutter curtain is in an intermediate position. The control means, based on the detection by the intermediate position detection means during the opening and closing operation of the shutter curtain, performs the opening and closing operation with n (n < N) drive units when the shutter curtain is between the lower limit position and the intermediate position, and performs the opening and closing operation with N drive units when the shutter curtain is between the intermediate position and the upper limit position. Shutter device.

2. The control means stops the opening and closing operation of the shutter curtain in response to the detection of an intermediate position. The shutter device according to claim 1.

3. The intermediate position detection means is A mechanical detection means for detecting an intermediate position when the shutter curtain is lowered, It includes an electrical detection means for detecting an intermediate position when the shutter curtain is raised. A shutter device according to either claim 1 or 2.

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