Shutter device

Abstract

To provide a shutter device including multiple drive units capable of appropriately correcting tilt of a shutter curtain when the shutter curtain tilts.SOLUTION: A shutter device includes: a first wire and a second wire that are wound up or unwound by a first drive unit and a second drive unit; a shutter curtain that moves vertically by winding and unwinding the first wire and the second wire to open or close the opening; and control means that controls open / close operation of the shutter curtain. The control means has an interlocking mode in which the multiple drive units operate at the same time, and a single drive mode in which each drive unit operates independently. In the interlocking mode, the open / close operation of the shutter curtain is stopped on the basis of the comparison result detected by each of the open / close position detection means. In the single-drive mode, a position of the shutter curtain corresponding to each drive unit is adjusted by a single-operation unit.SELECTED DRAWING: Figure 76

Description

[Technical Field]

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

[0002] A shutter device has been proposed that includes a shutter curtain consisting of a plurality of aggregates extending in the opening width direction and a sheet attached to the plurality of aggregates, with a suspension wire fixed to the lower end of the shutter curtain, and when the shutter curtain is opened, the suspension wire is wound up, causing the aggregates to overlap while the sheet is folded, thereby pulling up and opening the shutter curtain (Patent Document 1).

[0003] In conventional shutter devices, a single drive unit raises and lowers the shutter curtain to open and close the opening, so when trying to open or close an opening with a large shutter curtain and a wide opening, there was a problem that the opening width was limited due to insufficient capacity of the drive unit. While the lack of capacity can be resolved by using multiple drive units, when trying to raise and lower the shutter curtain using multiple drive units, the shutter curtain may become tilted due to differences in the amount of pull-out of the suspension wires, and in that case, it is necessary to correct the tilt of the shutter curtain and return the bottom to a horizontal position. [Patent Document 1] Patent Publication No. 60-226990 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] The present invention aims to appropriately correct the tilt of a shutter curtain in a shutter device equipped with multiple drive devices when the shutter curtain becomes tilted. [Means for solving the problem]

[0005] The technical means adopted by the present invention are: A plurality of drive units; Multiple wires are wound and unwound by each drive unit, a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; In a shutter device comprising: The control means has a linked mode in which the plurality of drive devices operate simultaneously, and a single-action mode in which each drive device operates individually. A shutter device.

[0006] In one embodiment, an interlocking operation unit for the interlocking mode and a single-action operation unit for the single-action mode are separately provided. In one embodiment, an operation mode changeover switch is provided, and the changeover switch allows switching between linked mode and single-action mode.

[0007] In one embodiment, each drive device is provided with an open / close position detection means for detecting the open / close position of the shutter curtain corresponding to each drive device in the linked mode; The control means 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 the single-action mode, the position of the shutter curtain corresponding to each drive unit is adjusted by the single-action operating unit. In one embodiment, each open / closed 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 open / closed position of the shutter curtain. In one embodiment, the open / close position detection means is an encoder. In one embodiment, the opening and closing operation of the shutter curtain is stopped when the difference in the positions is greater than a threshold value. In one embodiment, the lower end of the wire is connected to the bottom of the shutter curtain.

[0008] In one embodiment, a position comparison means for comparing the open / close positions detected by each open / close 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 When the difference in position obtained by the position comparison means is smaller than a predetermined threshold, it is determined to be normal, and if normal, opening and closing operations are performed in linked mode, and when the difference in position is larger than the threshold, it is determined to be abnormal, the opening and closing operation of the shutter curtain in linked mode is stopped, and in single-action mode, the position of the shutter curtain corresponding to each drive device is adjusted by the single-action operating unit.

[0009] In one embodiment, a control panel is provided that displays the operating status of the shutter curtain, and the control panel displays the drive device that is the target of adjustment by the single-action operating unit. In one embodiment, at the positions of the shutter curtain corresponding to multiple drive units, a lamp indicating the drive unit corresponding to the lowest position (or highest position) flashes, and the operator raises the drive unit corresponding to the flashing lamp by pressing the up switch (or down switch) on the single-action operating unit until the lamp stops flashing, determining that the tilt of the shutter curtain has been corrected and returned to a horizontal position, and then raising or lowering the shutter curtain by operating the interlocking operating unit.

[0010] In one aspect, a first operating device including the interlocking operating unit, the single-action operating unit, and the selector switch is provided below the opening, a second operating device including the interlocking operating unit, the single-action operating unit, and the selector switch is provided above the opening, The changeover switch of the first operating device is capable of selecting a maintenance mode, When the maintenance mode is selected, operation of the second operating device becomes possible.

[0011] In one embodiment, the open / close position detection means is an encoder, In the single-action mode, a reset means is provided for resetting the number of pulses of the encoder at a predetermined opening / closing position that has been set in advance. [Effects of the Invention]

[0012] In the shutter device of the present invention, when the shutter curtain tilts when it is raised or lowered in linked mode, the tilt of the shutter curtain can be corrected and returned to a horizontal position by individually driving each drive device in single-action mode, and the shutter curtain can be raised or lowered again in linked mode. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of the sheet shutter according to the first embodiment (with the opening fully closed). [Figure 2] 1 is a front view of the sheet shutter according to the first embodiment (with the opening fully open); [Figure 3] 1A and 1B are plan and front views of the upper end portion of the sheet shutter according to the first embodiment. [Figure 4] FIG. 2 is a longitudinal sectional view of FIG. [Figure 5] FIG. 2 is a side view of the shutter curtain according to the first embodiment (with the opening fully closed). [Figure 6] FIG. 3 is a longitudinal sectional view of FIG. 2. [Figure 7] FIG. 2 is a side view of the shutter curtain according to the first embodiment (with the opening fully open). [Figure 8] FIG. 2 is a side view of the aggregate according to the present embodiment. [Figure 9] 10 shows guide plates provided at both widthwise ends of the aggregate according to this embodiment. [Figure 10] FIG. 2 is a plan view of a width direction end portion of the sheet shutter according to the present embodiment. [Figure 11] The upper figure is a vertical cross-sectional view of FIG. 10, and the lower figure is a front view of FIG. [Figure 12] 2 is a partially enlarged view of the sheet width direction end portion (aggregate and sheet pressing member) of FIG. 1. [Figure 13]FIG. 5 is a partial enlarged view of the aggregate portion of FIG. 4. [Figure 14] 1A is a plan view of the bottom member, FIG. 1B is a front view seen from direction B, and FIG. 1C is a front view seen from direction C. [Figure 15] FIG. 15 is a partially enlarged view of the left side portion of FIG. [Figure 16] FIG. 15 is a partially enlarged view of the right side portion of FIG. [Figure 17] 10 is a cross-sectional view of an upper guided portion, a wire fixing portion, and a lower guided portion of the bottom member. FIG. [Figure 17A] 1 shows the guide rails according to this embodiment, with the right image showing the first guide rail and the left image showing the second guide rail. [Figure 18] 18 is a partial enlarged view of the upper guided portion of FIG. 17. [Figure 19] FIG. 18 is a partially enlarged view of the wire fixing portion of FIG. [Figure 20] 18 is a partial enlarged view of a lower guided portion in FIG. 17. [Figure 21] 2 is a partially enlarged view of the end portion in the width direction of the seat (the upper frame of the bottom member and the seat pressing member) in FIG. 1. FIG. [Figure 22] FIG. 10 shows the end plate assembly of the bottom member. [Figure 23] 5 is a side view of the lower part of the shutter curtain in the fully closed position of FIG. 4. FIG. [Figure 24] 10 shows an embodiment in which a pair of wire fixing portions provided on an end plate of a bottom member are positioned at different heights. [Figure 25] 5 is a partially enlarged view showing the upper winding device of FIG. 4. [Figure 26] FIG. 4 is a partially enlarged view of the plan view of FIG. 3. [Figure 27] FIG. 2 is a partially enlarged plan view of an upper portion of the sheet shutter according to the first embodiment, showing an upper limit switch and an emergency switch (a beam H and a mounting plate P are omitted). [Figure 28] FIG. 10 is a vertical cross-sectional view of the upper portion of the sheet shutter (when the opening is fully open), showing the upper limit switch in the OFF state. [Figure 29]FIG. 10 is a vertical cross-sectional view of the upper portion of the sheet shutter (with the opening fully open) showing the emergency switch in the OFF state. [Figure 30] This shows the operating part and the locking part of the locking device of the bottom lock mechanism (viewed from the indoor side). [Figure 31] 30 shows a locking device of the bottom lock mechanism (FIG. 30 is a view from the right, and FIG. 32 is a view from the left). [Figure 32] The bottom lock mechanism is shown, with the locking portion shown by the solid line in the locked position and the locking portion shown by the two-dot chain line in the unlocked position. [Figure 33] 10 is a cross-sectional view of the width direction end of the bottom member, showing the bottom lock mechanism. FIG. [Figure 34] FIG. 10 is a partial vertical cross-sectional view showing the overlapping state of the frame and bottom member of the shutter curtain in the fully open state. [Figure 35] FIG. 1 is a front view showing a seat according to a first embodiment. [Figure 36] FIG. 10 is a front view of the sheet shutter according to the second embodiment (with the opening fully closed). [Figure 37] FIG. 10 is a front view of the sheet shutter according to the second embodiment (with the opening fully open). [Figure 38] 10A and 10B are plan and front views of the upper end portion of a sheet shutter according to a second embodiment. [Figure 39] FIG. 39 is a partially enlarged view of FIG. 38. [Figure 40] 37A and 37B are longitudinal cross-sectional views of FIG. 36, the left diagram being a longitudinal cross-sectional view of the upper and middle regions, and the right diagram being a longitudinal cross-sectional view of the upper and lower regions. [Figure 41] FIG. 10 is a side view of the shutter curtain according to the second embodiment (with the opening fully closed). [Figure 42] FIG. 10 is a vertical side view of the upper and middle parts of the shutter curtain according to the second embodiment (with the opening fully closed). [Figure 43] 38 is a longitudinal cross-sectional view of FIG. 37, the left figure being a longitudinal cross-sectional view of the upper and middle regions, and the right figure being a longitudinal cross-sectional view of the upper and lower regions. [Figure 43A]This figure shows the positional relationship between the intermediate guide rail 3 and the folded lower part (overlapping bottom member and aggregate) when the opening of the sheet shutter in the second embodiment is in a fully open state (the folded sheet is omitted). [Figure 44] 10A and 10B are longitudinal cross-sectional views of a shutter curtain according to a second embodiment (with the opening fully open), the left figure being a longitudinal cross-sectional view of the upper and middle parts, and the right figure being a longitudinal cross-sectional view of the upper and lower parts. [Figure 45] FIG. 11 is a partial enlarged view of a first side in the visible width direction of an intermediate opening of an opening that is opened and closed by a shutter curtain according to a second embodiment. [Figure 46] FIG. 11 is a partial enlarged view of a second side in the visible width direction of an intermediate opening of the openings opened and closed by the shutter curtain according to the second embodiment. [Figure 47] 46 is a diagram showing a closed state of the first side in the front width direction of the intermediate opening shown in FIG. 45. FIG. [Figure 48] 47 is a diagram showing a closed state of the second side in the front width direction of the intermediate opening shown in FIG. 46. FIG. [Figure 48A] FIG. 10 is a diagram showing the panel body of the intermediate region (second intermediate region). [Figure 49] FIG. 10 is a plan view of the aggregate in the upper portion of the shutter curtain according to the second embodiment. [Figure 50] FIG. 10 is a plan view of a bottom member (upper bottom) in the upper part of the shutter curtain according to the second embodiment. [Figure 51] 10 is a diagram showing a bottom member and an intermediate portion of an upper portion of a shutter curtain according to a second embodiment. FIG. [Figure 52] FIG. 10 is a partial 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] FIG. 10 is a partial 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] 52 is a partial enlarged view of a lower part of a first intermediate part provided on a bottom member of an upper part of the shutter curtain according to the second embodiment shown in FIG. 51. FIG. [Figure 55]52 is a partial enlarged view of a lower part of a second intermediate part provided on a bottom member of an upper part of the shutter curtain according to the second embodiment shown in FIG. 51. FIG. [Figure 56] 52 is a vertical cross-sectional view showing a side of an intermediate guide rail provided in the intermediate portion of the shutter curtain according to the second embodiment shown in FIG. 51. FIG. [Figure 56A] FIG. 2 is a view showing the upper end portion of the first guide rail of the lower guide rail. [Figure 57] 10A and 10B are front views of widthwise ends of an intermediate section provided with intermediate guide rails according to a second embodiment, the left view showing the first guide rail and the right view showing the second guide rail. [Figure 58] 10 is a diagram showing 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. FIG. [Figure 59] 10A and 10B are diagrams showing the alignment of the lower ends of the intermediate guide rail and intermediate section with the upper end of the lower guide rail according to the second embodiment. [Figure 60] FIG. 10 is a partially enlarged plan view of an upper portion of the sheet shutter according to the second embodiment, showing an upper limit switch and an emergency switch (beam H and mounting plate P are omitted). [Figure 61] FIG. 11 is a partial vertical cross-sectional view showing the overlapping state of the framework and bottom member of the shutter curtain in the fully open state in the second embodiment. [Figure 62] FIG. 10 is a front view showing a seat according to a second embodiment. [Figure 63] 1 is a schematic diagram of a sheet shutter according to a first embodiment. [Figure 64] FIG. 3 is a block diagram showing control of the sheet shutter according to the first embodiment. [Figure 65] 4 is a flowchart of an opening operation of the sheet shutter according to the first embodiment. [Figure 66] 4 is a flowchart of a closing operation of the sheet shutter according to the first embodiment. [Figure 67] FIG. 10 is a schematic view of a sheet shutter according to a second embodiment. [Figure 68]FIG. 10 is a block diagram showing control of the sheet shutter according to the second embodiment. [Figure 69] 10 is a flowchart of an opening operation (from a fully closed position to an intermediate position) of the sheet shutter according to the second embodiment. [Figure 70] 10 is a flowchart of an opening operation (from an intermediate position to a fully open position) of the sheet shutter according to the second embodiment. [Figure 71] 10 is a flowchart of the closing operation (from the fully open position to the intermediate position) of the sheet shutter according to the second embodiment. [Figure 72] 10 is a flowchart of the closing operation (from an intermediate position to a fully closed position) of the sheet shutter according to the second embodiment. [Figure 73] FIG. 2 is a diagram showing an interlocking operation unit. [Figure 74] FIG. 4 is a diagram showing a single-action operating unit and an operation mode changeover switch. [Figure 75] 10 shows a plurality of status lamps that indicate the state of a shutter device according to a second embodiment. [Figure 76] 10 is a flowchart showing control based on abnormality determination in a 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, a first embodiment and a second embodiment. The major differences between the first embodiment and the second embodiment are 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 sizes of the opening and the shutter curtain are not limited. It should be noted that in this specification, the term "suspension wire W" may be used as a general term for wires (first wire W1, second wire W2, third wire W3), the term "sheet 4" may be used as a general term for sheets (first sheet 4A, second sheet 4B, etc.), the term "pulley 5" may be used as a general term for pulleys (first pulley 5A, second pulley 5B, etc.), the term "winding device 6" may be used as a general term for winding devices (first winding device 6A, second winding device 6B, etc.), the term "mounting plate P" may be used as a general term for mounting plates (mounting plate P1, mounting plate P2), the term "guide rail G" may be used as a general term for guide rails (upper guide rail G1, lower guide rail G2, etc.), and the term "beam H" may be used as a general term for beams (beams 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 that opens and closes the opening, guide rails G that are located on both sides of the opening width direction and guide both ends of the shutter curtain 1 in the height direction, and a lifting and lowering drive device for the shutter curtain 1. In this specification, the opening width direction is the width direction of the shutter curtain 1 and the components of the shutter curtain 1, and means the viewing 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 positioned 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 that is dish-shaped in cross section and extends in the width direction of the opening so as to bridge 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 widthwise ends of the opening are defined by left and right frames C and left and right guide rails G fixed to the frames C.

[0017] The shutter curtain 1 has a predetermined projected width and is composed of multiple aggregates extending in the width direction of the opening and sheets attached to the multiple aggregates. In this embodiment, the multiple aggregates are composed of multiple aggregates 2 and the lowest bottom member 3. The aggregates 2 and bottom member 3 each have a predetermined projected width. The sheet 4 in this embodiment is composed of two sheets: a first sheet 4A fixed to a first side of each aggregate 2 and bottom member 3 in the projected direction and forming the first visible surface of the shutter curtain 1; and a second sheet 4B fixed to a second side of each aggregate 2 and bottom member 3 in the projected direction 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 opposite each other in the projected 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 includes a wire whose lower end is connected to the bottom member 3, and a winding device that is provided above the opening and to which the upper end of the wire is connected. The lower ends of a first wire W1 and a second wire W2 are connected to both widthwise ends of the bottom member 3, which is located at the lowest position of the shutter curtain 1. The first wire W1 is wound around a first pulley 5A above the opening and connected to a first winding device 6A provided above the opening. The second wire W2 is wound around a second pulley 5B above the opening and connected to a second winding device 6B provided above the opening.

[0019] When the opening is closed, the first wire W1 and the second wire W2 are unwound, so that the shutter curtain 1 is in an extended state in which the aggregates 2 and bottom member 3 are separated in the vertical direction and the sheets 4A and 4B face each other and extend perpendicularly in the vertical direction; when the opening is opened, the first wire W1 and the second wire W2 are wound up, so that the shutter curtain 1 is in a folded state in which the multiple aggregates 2 and bottom member 3 are overlapped in the vertical direction and the first sheet 4A and the second sheet 4B are folded on the first side and the second side, respectively.

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

[0021] [B-1] Aggregate As shown in Fig. 8, aggregate 2 has a predetermined projected width and is composed of horizontal portion 20 extending in the opening width direction (projection direction), and abutting portions 21, 21 provided at both ends of the horizontal portion in the projected direction and extending in the opening width direction, the height dimension of abutting portion 21 being greater than the height (thickness) of horizontal portion 20, the upper end portion 22 of abutting portion 21 being located above the upper surface 200 of horizontal portion 20, and the lower end portion 23 of abutting portion 21 being located below the lower surface 201 of horizontal portion 20. Abutting portions 21, 21 have a vertical projecting surface 210, and first sheet 4A and second sheet 4B are fixed in a state of abutting against projecting surface 210 (see Fig. 13).

[0022] When the opening is opened, adjacent aggregates 2 on the top and bottom overlap, but in the adjacent aggregates 2 on the top and bottom, one of the lower end 23 of the abutment portion 21 of the upper aggregate 2 and the upper end 22 of the abutment portion 21 of the lower aggregate 2 is concave and the other is convex, so that when the opening is opened, the lower end 23 of the upper aggregate 2 and the upper end 22 of the lower aggregate 2 fit together.

[0023] In this embodiment, the upper end 22 of the aggregate 2 is recessed, and the recess is composed of a horizontal surface 220 that forms the bottom surface of the recess, an outer convex portion 221 that is located outside the horizontal surface 220 and has an inclined surface 2210, and a convex portion 222 that is located inside the horizontal surface 220. The lower end 23 of the aggregate 2 is downwardly protruding, and the convex portion is composed of a horizontal surface 230 that forms the bottom 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 stacked one on top of the other, the convex portion of the lower end 22 of the aggregate 2 fits into the convex portion of the lower end 23 of the aggregate 2 (see FIG. 34).

[0024] [B-1-1] Guide receiving part As shown in Figures 10 and 11, horizontal guide plates 24 are fixed to both longitudinal ends of the upper surface 200 of the horizontal portion 20 of the aggregate 2. The tip side of the guide plate 24 protrudes beyond the longitudinal ends of the aggregate 2, and a guide receiving portion 25 is formed on the protruding portion. The guide receiving portion 25 is composed of a guided groove portion 250 extending in the front direction and a wide portion 251 located on the back side of the guided groove portion 250. The guided groove portion 250 is formed by a pair of guide elements, which in this embodiment are 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 slipperiness.

[0025] In this embodiment, the guide plate 24 is fixed to the horizontal portion 20 at the base end portion, which is approximately square in plan view, and a cutout portion 240 with a predetermined projected width and depth is formed in the protruding portion at the tip end, and both sides of the opening of the cutout portion 240 are inclined edges 241 in plan view so as not to interfere with the lifting and lowering 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 cutout portion 240, facing each other in the projection direction and spaced apart from each other. The opening of the cutout portion 240 is narrowed by the sliding members 26, and the gap between the sliding members 26 forms a guided groove portion 250. In the cutout portion 240, the portion on the back side of the guided groove portion 250 forms a wide portion 251 that is wider than the guided groove portion 250. A pair of fixing members 27 are provided at the opening of the cutout portion 240, and each sliding member 26 is supported by each fixing member 27. As shown in FIG. 9 , the height of the sliding members 26 and the fixing members 27 is greater than the thickness of the guide plate 24.

[0027] 9, sliding member 26 is a substantially rectangular parallelepiped having a substantially rectangular shape in a plan view, and includes a leading end visible surface 260 that forms guided groove portion 250, a base end visible surface 261, an outer visible surface 262, and an inner visible surface 263. Leading end visible surface 260 that forms guided groove portion 250 bulges out gently in a plan view.

[0028] The fixing member 27 is formed from a sight piece 270, an outer sight piece 271, and an inner sight piece 272, and is provided with a support portion that is L-shaped in plan view from the sight piece 270 and the outer sight piece 271. With the sight surface 261 at the base end of the sliding member 26 abutting against the sight piece 270 and the outer sight surface 262 abutting against the outer sight piece 271, the sliding member 26 is fastened to the outer sight piece 271 with a screw S1 (FIG. 9), thereby being detachably attached to the fixing member 27. The tip sight surface 260 protrudes beyond the tip of the outer sight piece 271 to which the outer sight surface 262 is attached.

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

[0030] The upper frame 30 according to this embodiment is a square pipe having a rectangular cross section, and has vertical side surfaces (visible surfaces) 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 square pipe with a rectangular cross section, and has vertical side surfaces (visible faces) 310. The visible face 300 of one upper frame 30 and the visible face 310 of the lower frame 31 form the visible face of the first side of the bottom member 3, and the visible face 300 of the other upper frame 30 and the visible face 310 of the lower frame 31 form the visible face of the second side of the bottom member 3.

[0032] On the upper surface 301 of the upper frame 30, convex portions 33 are formed at intervals in the width direction, adjacent to the surface that abuts the lower end portions 23 of the upper aggregates 2. In this embodiment, on the upper surface 301, the convex portions 33 are provided at positions inside the surface that abuts the lower end portions 23 of the aggregates 2. A plurality of convex portions 33 according to this embodiment are provided at intervals in the width direction of the upper surface 301 of the bottom member 3, 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 (the width direction of the shutter curtain 1), and two buffer members 34 are arranged side by side and spaced apart in the prospective direction, so that when the opening is fully closed, the buffer member 34 at the lower end of the bottom member 3 comes into close contact with the floor surface FL.

[0034] As shown in FIGS. 17 to 20 and 22, the end plate 32 has a vertically elongated rectangular shape and forms the left and right projecting surfaces of the bottom member 3. A wire fixing portion 35 is provided at the height center of the end plate 32. 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 include a pair of guide elements. In this embodiment, the upper guided portion 36 includes a pair of sliding members 362, and the lower guided portion 37 includes a pair of first and second guide rollers 370 and 371. Because the upper guided portion 36 and the lower guided portion 37 are located above and below the bottom member 3 in the height direction, tilting of the bottom member 3 can be suppressed.

[0035] [B-2-1] Wire fixing part 19, 22, and 23, the wire fixing portion 35 according to this embodiment comprises a pair of wire fixing portions 35 arranged side by side in the projection direction. Each wire fixing portion 35 comprises a shaft portion 350 to which the lower end of the suspension wire W is attached, a support portion 351 that supports the shaft portion 350, and a base 352 that projects from the end plate 32 and to which the support portion 351 is fixed. A height adjustment means 353, such as a bolt extending vertically, is provided at the upper end of the base 352. This height adjustment means 353 adjusts the height of the two suspension wires W connected to the wire fixing portions 35 so that there is no slack in the two suspension wires W connected to the wire fixing portions 35, thereby preventing the bottom member 3 from tilting when the wire fixing portions 35 are pulled upward.

[0036] [B-2-2] Upper guided part As shown in Figures 18 and 22, the upper guided portion 36 is composed 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 a vertical surface portion 3610 fixed to the end plate 32, and the guide receiving portion 360 is formed in the upper guide plate 361. Similar to the guide plate 24, a notch portion 3611 is formed in the upper guide plate 361. A pair of sliding members 362 are provided at the opening of the notch portion 3611 and spaced apart in the projection direction. A guided groove portion is formed between the sliding members 362, and the rear side of the guided groove portion in the notch portion 3611 is a wide portion. The sliding members 362 are fixed to a pair of fixing members 363 that are located at the opening of the notch portion 3611 and spaced apart in the projection direction. The configuration of the guide receiving portion 360 of the bottom member 3 is the same as the configuration of the guide receiving portion 25 at both ends of the aggregate 2 in the longitudinal direction, and the description of the guide receiving portion 25 can be used as needed.

[0037] [B-2-3] Lower guided part 20 and 22, the lower guided portion 37 includes a pair of first guide rollers 370 and a lower guide plate 372 equipped with a second guide roller 371 oriented perpendicular to the first guide rollers 370 in a plan view. The lower guide plate 372 extends horizontally from the lower end of a 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 face each other at a distance so as to sandwich the opening of the notch 3721 from the forward direction. A guided groove having a width narrower than the width of the opening is formed between the peripheral surfaces of the first guide rollers 370 facing each other in the forward direction. The second guide roller 371 is provided on the vertical surface portion 3720. In addition, the pair of first guide rollers 370 and second guide rollers 371, which are the guide elements of the lower guided portion 37, are located at the lowest position of the shutter curtain 1, so they can smoothly respond to horizontal deviations of the shutter curtain 1 (sheet 4), including the forward and backward directions.

[0038] [B-3] Seat and seat fixing structure The first sheet 4A and the second sheet 4B have height and width dimensions sufficient to close the opening. The first sheet 4A and the second sheet 4B are fixed in contact with the facing surfaces of the aggregates 2 and the bottom member 3, with the aggregates 2 and the bottom member 3 positioned parallel to each other with a gap between them in the height direction. The upper ends of the first sheet 4A and the second sheet 4B are fixed to the first facing surface 140 and the second facing surface 141 of the top member 14. One facing surface of the aggregates 2 and the bottom member 3 and the other facing surface are flush with the first facing surface 140 and the second facing surface 141 (see FIG. 5).

[0039] In this embodiment, the multiple aggregates 2 and bottom member 3 have the same projected width, and the facing surfaces 210 of the abutting portions 21 of each aggregate 2, the facing surfaces 300 of the upper frame 30 of the bottom member 3, and the facing surfaces 310 of the lower frame 31 are located on the same vertical plane, and the first sheet 4A and the second sheet 4B are fixed to the facing surfaces 210, 300, 310 with screws S2 by sheet pressing members 7 extending in the sheet width direction while abutting against the facing surfaces 210 of each aggregate 2 and the facing surfaces 300, 310 of the bottom member 3 (Figures 5, 10 to 13, 18 to 21).

[0040] 13, in a cross-sectional view, the sheet retaining member 7 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 fixed with a plurality of screws S2 spaced apart in the opening width direction, with the vertical portion 70 overlapping the sheet 4 from above and the sheet 4 sandwiched between the vertical portion 70 and the visible surfaces, with the sheet 4 abutting the visible surfaces of the aggregate 2 and the bottom member 3.

[0041] As shown in Figures 10 to 12 and 18 to 21, the visible width of the sheet 4 is greater than the visible widths of the aggregates 2 and bottom member 3, and both widthwise ends of the sheet 4 have extensions 42 that extend beyond the longitudinal ends of the aggregates 2 and bottom member 3. The widthwise edges of the sheet 4 are indicated by 4'. The length of the sheet retaining member 7 is longer at its ends than the length of the aggregates 2 and bottom member 3, and both widthwise ends of the sheet retaining member 7 extend beyond the widthwise ends of the aggregates 2 and 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 sandwiched between a back plate 73 serving as a fixing member and the extensions 7' of the sheet retaining member 7, and are fixed with screws S3. The shape of the fixing member is not limited, but the back plate 73 in this embodiment is a thin, circular plate.

[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 it can be made of a known sheet material. As shown in Fig. 35, the sheet 4 according to this embodiment is formed by connecting multiple strip-shaped sheets 400 extending in the height direction in the width direction. Because the connecting portions of the strip-shaped sheets 400 extend in the sheet height direction, the impact of the sheet's own weight on the connecting portions is smaller than when multiple sheets are connected in the height direction (the connecting portions extend horizontally).

[0043] [C] Guide mechanism The guide rails G are fixed to the frame C at both ends of the opening and extend across substantially the entire height of the opening. As shown in FIGS. 10, 17A, and 18-20, the guide rail G according to this embodiment comprises a first guide rail 8 located approximately in the center of the projection width of the shutter curtain 1 and extending in the projection direction, and a pair of second guide rails 9 located on either side of the first guide rail 8 in a plan view and extending in the projection direction. In this embodiment, the projection lengths of the first guide rail 8 and the second guide rails 9 are the same. Both widthwise ends of the shutter curtain 1 are guided by the guide rails G. The first guide rail 8 is received between the guide receiving portion 25 of each aggregate 2, the guide receiving portion 360 of the bottom member 3, and a pair of first guide rollers 370. The widthwise ends of the first sheet 4A are positioned outside one of the second guide rails 9, and the widthwise ends of the second sheet 4B are positioned outside the other of the second guide rails 9.

[0044] [C-1] First guide rail The first guide rail 8 is located approximately in the center of the projection width of the shutter curtain 1, with its base end fixed to the frame C and equipped with a guide portion at its tip end in the projection direction. The guide portion of the first guide rail 8 is equipped with a first portion 80 located approximately in the center of the projection width of the shutter curtain 1 and extending in the projection direction, and a second portion 81 extending in the projection direction at the tip of the first portion 80, and in this embodiment is equipped with a T-shape in plan view. The base end side 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 frame C by fixing the fixing piece 82 to the frame C with a bolt.

[0045] [C-2] Second guide rail (sheet guide) The base end of the second guide rail 9 is fixed to the frame C, and its tip end in the facing direction is located on the facing surfaces of both widthwise ends of the shutter curtain 1, so that it abuts or is close to both widthwise ends of the sheet 4 from the inside. The second guide rail 9 has a first facing piece 90 on the tip side, a second facing piece 91 on the base side located inside the facing direction relative to the first facing piece 90, and a step portion 92 located between the base end of the first facing piece 90 and the tip of the second facing piece 91. The widthwise end of the sheet 4 abuts or is close to the outer surface of the first facing piece 90. A fixed piece 93 extending perpendicular to the second facing piece 91 is provided at the base end of the second facing piece 91, so that the second guide rail 9 as a whole is generally L-shaped 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 The first guide mechanism equipped with the first guide rail 8 will now be described. At both widthwise ends of the aggregate 2, there is provided a guide receiving portion 25, which is composed of a guided groove portion 250 extending in the forward direction and a wide portion 251 located on the rear side of the guided groove portion 250. A part of the first portion 80 is located in the guided groove portion 250 with a clearance, and the second portion 81 is located in the wide portion 251. The projected dimension of the second portion 81 is larger than the groove width of the guided groove portion 250 but smaller than the projected width of the wide portion 251, so that the second portion 81 can be engaged with the guided groove portion 250 (the inner projected surface 263 of the sliding member 26). The sliding member 26 according to this embodiment is made of a resin with good slipperiness, so that even when the second portion 81 abuts against the inner projected surface 263 of the sliding member 26, the shutter curtain 1 can be opened and closed without any problems.

[0047] At both widthwise ends 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 is provided on the lower side. A part of the first portion 80 is located in the guided groove portion of the upper guide receiving portion 360 with a clearance, and the second portion 81 is located in the wide portion, and the projected dimension of the second portion 81 is larger than the groove width of the guided groove portion and smaller than the projected width of the wide portion, so that the second portion 81 can be engaged with the guided groove portion (the inner projected surface of the sliding member 362).

[0048] A part of the first portion 80 is positioned with a clearance between the pair of first guide rollers 370 of the lower guided portion 37, the projected dimension of the second portion 81 is larger than the groove width between the first guide rollers 370, and the inner side surfaces of the first guide rollers 370 and the second portion 81 are spaced apart so as not to come into contact with each other. The tip surface of the second portion 81 faces the second guide roller 371 at a distance, and the second guide roller 371 can slide against the tip surface of the second portion 81 in response to the swing of the shutter curtain 1 in the width direction. As shown in FIG. 22 , the second guide roller 371 is positioned above the pair of first guide rollers 370.

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

[0050] [C-4] Second guide mechanism The second guide mechanism including the second guide rail 9 will be described. Both widthwise end portions of the first sheet 4A are extension portions 42 that extend beyond the widthwise ends of the aggregate 2 and the bottom member 3. The extension portions 42 include a first portion 420 that abuts or is close to a first end piece 90 of one of the second guide rails 9, and a second portion 421 that faces the second end piece 91 at a distance. The second portion 421 is sandwiched between the back plate 73 while abutting against the back surface of the extension portion 7' ​​and fixed to the extension portion 7' ​​with screws S3. The second guide rail 9 is a sheet guide, and both widthwise end portions of the first sheet 4A are guided by the first end pieces 90 of the second guide rail 9 that are located on the back surface side of the first portions 420 of the widthwise end portions of the first sheet 4A.

[0051] Both widthwise end portions of the second sheet 4B are extensions 42 that extend beyond the widthwise ends of the aggregate 2 and the bottom member 3, and the extensions 42 have a first portion 420 that abuts or is close to the first end piece 90 of the other second guide rail 9, and a second portion 421 that faces the second end piece 91 at a distance, and the second portion 421 is sandwiched between the back plate 73 while abutting against the back surface of the extension 7' ​​and fixed to the extension 7' ​​with screws S3. The second guide rail 9 is a sheet guide, and both widthwise end portions of the second sheet 4B are guided by the first end pieces 90 of the second guide rail 9 that are located on the back surface side of the first portions 420 of the both widthwise end portions of the second sheet 4B.

[0052] In each second guide rail 9, the projected dimension of the step 92 of the second guide rail 9 is larger than the projected dimension of the back plate 73 in a plan view (i.e., the thickness of the back plate 73), and the back plate 73 located on the back surface of the second portion 421 at both widthwise end portions of the sheet 4 faces the second facing piece 91 of the second guide rail 9 at a distance, thereby restricting contact between the back plate 73 and the second facing piece 91. The back plate 73 facing the second facing piece 91 of the second guide rail 9 at a distance is spaced outward in the facing direction from the step 92 of the second guide rail 9, and even when the second portion 81 abuts against the inner facing surface 263 of the sliding member 26, contact between the step 92 of the second guide rail and the back 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 includes a suspension wire W whose lower end is connected to the bottom member 3, and a winding device 6 that is 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 to move the suspension wire W upward and raise the shutter curtain 1, and by paying out the upper end of the suspension wire W, the suspension wire W is moved downward and the shutter curtain 1 is lowered.

[0054] 23, the suspension wire W according to this embodiment is a wire set consisting of two suspension wires W extending perpendicularly and facing each other in the projection direction. A first wire set consisting of two first wires W1 and a second wire set consisting of two second wires W2 are connected to the lower ends of both widthwise ends of the bottom member 3, which is located at the lowest position of the shutter curtain 1. More specifically, the first wires W1 are fixed to each of a pair of wire fixing portions 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 portions 35 provided on the other end plate 32 of the bottom member 3.

[0055] 10, 18, and 19, at both widthwise ends of the shutter curtain 1, the pair of first wires W1 and the pair of second wires W2 each extend vertically at positions spaced apart from the guide rails G (first guide rail 8, second guide rail 9), the guide plate 24, and the upper guide plate 361, and are not in contact with the guide rails G (first guide rail 8, second guide rail 9), the guide plate 24, or the upper guide plate 361. More specifically, the first wire W1 and the second wire W2 of one of the first and second wire sets each extend in the space between the first guide rail 8 and one of the second guide rails 9, and the other first wire W1 and second wire W2 of the first and second wire sets each extend in the space between the first guide rail 8 and the other of the second guide rails 9. A pair of inclined sides 241 are formed on both sides of the opening of the cutout portion 240 of the guide plate 24 in the projection direction in a plan view, so as not to interfere with the lifting and lowering paths of the two first wires W1 and the two second wires W2. The upper guide plate 361 also has similar inclined sides.

[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 of the opening above the upper end member 14 (see FIGS. 25, 26, and 27). The upper end portions of a first wire set (two first wires W1) and a second wire set (two second wires W2), which extend perpendicular to the height direction of the opening, extend in the height direction through notches 1420 formed at both longitudinal ends of a bottom surface 142 of the upper end member 14 and the space between the pair of beams H1 and H2 (see FIG. 25).

[0057] A first pulley 5A is disposed above the opening, positioned directly above one widthwise end of the opening, and a second pulley 5B is disposed directly above the other widthwise end of the opening. A first winding device 6A and a second winding device 6B are disposed on the ceiling surface above the opening, positioned directly above approximately the center of the opening in the widthwise direction. The first pulleys 5A are arranged side by side in the forward direction to form a first pulley set, and the second pulleys 5B are arranged side by side in the forward direction to form a second pulley set.

[0058] 1 to 3 and 26, the two first wires W1 are wound around the respective first pulleys 5A of the first pulley set above the opening, extend toward the center of the opening, and are connected to a first winding device 6A so that they can be wound up by the first winding device 6A. The two first wires W1 are wound up on a common winding drum 60 of the first winding device 6A, with one first wire W1 being wound up on one half 61 of the winding drum 60 extending in the forward direction, and the other first wire W1 being wound up on the other half 62.

[0059] 1 to 3, the two second wires W2 are wound around the respective second pulleys 5B of the second pulley set above the opening, extend toward the center of the opening, and are connected to a second winding device 6B so that they can be wound up by the second winding device 6B. The two second wires W2 are wound up on a common winding drum 60 of the second winding device 6B, with one second wire W2 wound up on one half 61 of the winding drum 60 extending in the forward direction, and the other second wire W2 wound up on the other half 62.

[0060] A pair of beams H1, H2 extend parallel to each other in the width direction of the opening above the opening, and a beam H3 is located at a distance from the interior side of the opening. Multiple mounting plates P are provided perpendicular to the beams H1, H2, and H3 so as to span 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 approximately the center of the opening in the width direction.

[0061] The two first wires W1 constituting the first wire set are wound around a common winding drum 60 of the first winding device 6A, and the two second wires W2 constituting the second wire set are wound around 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 each adjustable in the height direction. As shown in FIG. 24 , the base 352 of the wire fixing portion 35 is fixed to the end plate 32 so that its position in the height direction can be adjusted. More specifically, the end plate 32 is formed with an elongated hole extending in the height direction, and the height position of the wire fixing portion 35 is adjusted as necessary using height adjustment means 353 located above the base 352, and the wire fixing portion 35 is fixed to the end plate 32 with screws 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 around the winding drums 60 of the first winding device 6A and the second winding device 6B, and the shutter curtain 1 rises with the multiple aggregates 2 and the bottom member 3 overlapping in the height direction, and the sheets 4A and 4B are folded outward on the first and second sides, respectively, to a folded state, and the opening is fully opened (see FIGS. 2, 6, and 7).

[0063] When the shutter curtain 1 rises, the upper end (upper surface 301) of the bottom member 3 abuts against the lower end 23 of the aggregate 2, and of the adjacent aggregates 2, the upper end 22 of the lower aggregate 2 abuts against the lower end 23 of the upper aggregate 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 lifting wire W, abuts against the horizontal surface 230 of the lower end 23 of the lowest aggregate 2, moving that aggregate 2 upward, and the horizontal surface 220 of the upper end 22 of that aggregate 2 abuts against the horizontal surface 230 of the lower end 23 of the aggregate 2 located above, moving that aggregate 2 upward.

[0064] As shown in Figure 34, when the bottom member 3 and the aggregate 2 are overlapped, the convex portion 33 on the upper surface 301 of the bottom member 3 is located inside the downward convex portions of the lower end portions 23 of the aggregates 2 located on both sides in the projection direction. The height of the convex portion 33 in this embodiment is lower than the height of the downward convex portion of the lower end portion 23, and the portions facing and spaced apart from the inner vertical surface 232 of the downward convex portion 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 aggregate 2 are misaligned in the projection direction while separated from each other, the inclined surface 331 of one of the convex portions 33 will abut against the corner between the inner vertical surface 232 and the horizontal surface 230 of one of the downward convex portions, thereby restricting the misalignment. If the bottom member 3 and the upper aggregate 2 are in contact and shift in the expected direction, the vertical surface 330 of one of the convex portions 33 will come into contact with the inner vertical surface 232 of one of the downward convex portions, thereby regulating the shift.

[0065] As shown in Figure 34, when the aggregates 2 are overlapped, the horizontal surface 220 of the recessed portion 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 recessed portion 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 on the inner side of the recessed portion 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 moves upward (when the shutter curtain 1 is pulled up), if the upper and lower aggregates 2 are separated and shift in the prospective direction, or if the upper and lower aggregates 2 are abutting and shift in the prospective direction, one of the convex portions 232 will abut against one of the inner convex portions 222, and the other inclined surface 2210 will abut against the inclined surface 231, thereby regulating the shift.

[0066] When the shutter curtain 1 reaches a predetermined upper limit position during lift, the upper limit switch LSU is activated and the motorized lift stops. In the shutter curtain 1, abutment portions 2000 consisting of convex portions are provided on the upper surface 200 of the horizontal portion 20 of the uppermost aggregate 2 at intervals in the opening width direction. 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 from the bottom surface 142. An upper limit limit switch LSU is provided inside the upper end member 14 at an interval in the opening width direction, 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 top aggregate 2 rises to the upper limit position as a result of the winding up of the lifting wire W by the winding device 6, the abutment portion 2000 of the top aggregate 2 abuts against 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 state. Furthermore, an emergency switch EMS is provided inside the upper end member 14 at an interval in the opening width direction, 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. The shutter curtain 1 descends while the aggregate 2 and bottom member 3 separate in the vertical direction, and the sheets 4A and 4B are extended vertically. The buffer member 34 at the bottom end of the bottom member 3 touches the floor, fully closing the opening (see Figures 1, 4, and 5). When the shutter curtain 1 reaches its upper limit as it ascends, the upper limit switch LSU is activated, stopping the motorized ascent. 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 state. A detection portion 39 that comes into contact with a lower limit switch LSD is provided at the lower end portion of the end plate 32 of the bottom member 3 (FIGS. 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 Fig. 16 and Figs. 30 to 33. The bottom lock mechanism is made up of a locking device 15 provided at the lower end of the guide rail G and locking receiving portions 16 provided at both ends of the bottom member 3 in the width direction. The bottom lock mechanism is made up of a locking device provided at the lower end of the guide rail G and equipped with locking portions 150 that can take an unlocked position and a locked position, and when the opening is fully closed, the locking portion in the locked position locks with the locking receiving portion, thereby restricting the shutter curtain from lifting up.

[0070] In this embodiment, the locking receiving portion 16 is located and fixed on the outdoor side in the projection direction of the lower portion of the end plate 32 of the bottom member 3, and is provided with a horizontal locking surface 160 and an abutment portion 161 formed on the locking surface 160. Positioning the locking portion of the bottom lock mechanism (the locking receiving portion 16 and the locking portion 150) on the outdoor side is effective in preventing lifting from the outside.

[0071] The locking device 15 has a locking portion 150 that is movable between an unlocked position and a locked position, and the locking portion 150 is adapted to selectively assume the locked position or the 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 lock receiving portion 16, and when the bottom member 3 at the lower end of the shutter curtain 1, which is in the fully closed opening position, is lifted, the locking surface 160 of the lock receiving portion 16 comes into contact with the underside of the locking portion 150 from below, restricting the upward movement of the bottom member 3.

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

[0073] Operating unit 151 and locking unit 150 are interlocked via shaft 152 extending horizontally and link 153 extending generally in the vertical direction, and when operating unit 151 is in a first position, the lower end of link 153 is pushed inward in the finding direction and the upper end of link 153 is pulled outward in the finding direction, causing locking unit 150 to assume an unlocked position, and when operating unit 151 is in a second position, the lower end of link 153 moves outward in the finding direction and the upper end of link 153 is pushed inward in the finding direction, causing locking unit 150 to assume a locked position. As link 153 rotates, part of link 153 switches the detection switch MS between ON and OFF.

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

[0075] In this embodiment, the locking portion 150 is biased by a spring 154 to assume the locked position, 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 abuts against an abutment portion 161 formed on the locking surface 160 of the lock receiving portion 16, thereby positioning the locking surface 160 in the locked position. The locking device 15 is equipped with a means for maintaining the locking portion 150 in the unlocked position, and in this embodiment, the locking pin 155 is engaged with an engaged 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), thereby restricting rotation of the shaft portion 152. Normally, the locking pin 155 is in the locked state, and rotation of the operating portion 151 is restricted.

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

[0077] Although the locking device 15 according to this embodiment is operated manually (by rotating the operating unit 151), the locking device 15 may also be operated electrically. Specifically, when the opening is fully closed (the lower limit switch LSD is in the OFF state), the locking unit moves from the unlocked position to the locked position in response to a lock signal input from the control unit, thereby establishing the locked state. The locking signal may be input by manually operating a switch. Alternatively, a timer may be activated after the lower limit switch LSD is turned OFF, and the locking signal may be transmitted after a predetermined time has elapsed. Examples of means for moving the locking unit include a spring biasing the locking direction, restricting the expansion of the spring, which is compressed in the unlocked position, and releasing the restriction in response to a lock signal, or a solenoid moving the locking unit in response to a lock signal input.

[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. Like the sheet shutter according to the first embodiment, the sheet shutter according to the second embodiment includes a shutter curtain 1' that opens and closes the opening, guide rails G that guide both widthwise ends of the shutter curtain 1' in the height direction, and a lifting / lowering drive device for the shutter curtain 1'. As with 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 that has a dish-like cross section and extends in the width direction of the opening so as to bridge the lower ends of the pair of beams H1 and H2. The lower end of the opening is defined by the floor surface FL. As will be apparent from the following description, the shape of the opening according to the second embodiment differs from that of the first embodiment.

[0079] The shutter curtain 1' according to the second embodiment comprises 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 portion above the lower portion 11. The visible width dimension of the intermediate portion 12 according to this embodiment is larger 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 embodiment, the narrow lower portion 11 is located closer to the first side than the widthwise center of the wide upper portion 10.

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

[0081] The lower portion 11 is made up of a plurality of short aggregates extending in the opening width direction and a narrow sheet 41 attached to the plurality of short aggregates, and its height dimension is variable by adopting an extended state in which the short aggregates are spaced apart in the height direction and a folded state in which the short aggregates are overlapped in the height direction. In the lower portion 11, the plurality of short aggregates are made up of a plurality of aggregates 2'' and a bottom member 3' located at the bottom of the lower portion 11 (i.e., the shutter curtain 1').

[0082] The sheets (wide sheet 40 and narrow sheet 41) according to this embodiment are composed 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' face each other with a gap in the visible direction. The aggregates 2' and 2'', the bottom members 3' and 13, and the top member 14 have the same predetermined visible width. The first sheet 4A' is fixed to a first side of the top member 14, aggregate 2', bottom member 13, aggregate 2'', and bottom member 3' in the visible direction, and the second sheet 4B' is fixed to a second side of the top member 14, aggregate 2', bottom member 13, aggregate 2'', and bottom member 3' in the visible direction. In the second embodiment, the wide sheet 40 and the narrow sheet 41 are formed from the same sheets 4A' and 4B'.

[0083] The bottom member 13 of the upper portion 10 includes a first portion 13A located directly above the aggregate 2'' of the lower portion 11, a second portion 13B located on a first side in the width direction (length direction) of the first portion 13A, and a third portion 13C located on a second side in the width direction (length direction) of the first portion 13A. A first intermediate portion 12A is provided below the second portion 13B of the bottom member 13 of the upper portion 10, and a second intermediate portion 12B is provided below the third portion 13C of the bottom member 13. The intermediate portions 12 (first intermediate portion 12A, second intermediate portion 12B) are located on the sides of the upper portion of the lower portion 11. The intermediate portion 12 is a panel body formed by joining a plurality of square pipes in a framework, and its height dimension is constant.

[0084] The opening that is 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 that is located between the upper and lower openings and is narrower than the upper opening but wider than the lower opening. The upper end of the opening (upper opening) is defined by an upper end member 14, and the lower end of the opening (lower opening) is defined by a floor surface FL.

[0085] Both widthwise ends of the upper opening are defined by upper guide rails G1, and both widthwise ends of the lower opening are defined by lower guide rails G2. Both widthwise ends of the middle opening are defined by middle side walls C1. At the lower end of the upper opening, the portion located outside both widthwise ends of the middle opening forms an upper floor surface FL1. At the lower end of the middle opening, the portion located outside both widthwise ends of the lower opening forms a middle 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 middle portion 12 and the upper portion of the narrow lower portion 11 are located in the middle opening, and the remaining portion of the lower portion 11 is located in the narrow lower opening. The middle portion 12 according to this embodiment is composed of a first middle portion 12A and a second middle portion 12B, and the space between the first middle portion 12A and the second middle portion 12B corresponds to the apparent width dimension of the lower portion 11, and an middle guide rail G3 is provided in the portion facing the space between the first middle portion 12A and the second middle portion 12B, positioned directly above the lower guide rail G2.

[0087] 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 to both widthwise ends of the bottom member 3' located at the lowest position of the shutter curtain 1'. The first wire W1 extends vertically along a first widthwise side of the lower portion 11, passes vertically through the upper portion 10, is wound around a first pulley set 5A above the opening, and is connected to a first winding device 6A provided above the opening. The second wire W2 extends vertically along a second widthwise side of the lower portion 11, passes vertically through the upper portion 10, is wound around a second pulley set 5B above the opening, and is connected to a second winding device 6B provided above the opening.

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

[0089] That is, the sheet shutter according to the second embodiment opens and closes the opening by electrically raising and lowering the shutter curtain 1' using the 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 portion 11, a third wire set (two third wires W3) whose lower end is provided at one widthwise end of the bottom member 13 of the upper portion 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 wire W1, the second wire W2, and the third wire W3 are unwound by the first winding device 6A, the second winding device 6B, and the third winding device 6C, so that the shutter curtain 1' is in an extended state in which the bottom member 3', the aggregate 2'', the bottom member 13, and the aggregate 2' are separated in the height direction, and the sheets 4A' and 4B' are extended perpendicular to the height direction.When the opening is fully closed, the lower limit switch LSD is in the OFF state.

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

[0092] When the opening is opened, the first wire W1, second wire W2, and third wire W3 are wound up by the first winding device 6A, second winding device 6B, and third winding device 6C, so that the shutter curtain 1' is in a folded state in which the bottom member 3', aggregate 2'', bottom member 13, and aggregate 2' are stacked in the height direction, and the sheets 4A' and 4B' are folded on the first and second sides, respectively. When the shutter curtain 1' rises and reaches a predetermined upper limit position, the upper limit switch LSU is activated and the electric lifting 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 comprises a wide upper portion 10, a narrow lower portion 11, and a middle portion 12 that is located below and fixed to the upper portion 10 and is at the same height as the portion above 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 used as needed. In the shutter curtain 1' according to this embodiment, the frames 2', 2'' and the sheet retaining member 7 are formed from aluminum extrusions, but may also be made of steel, stainless steel, etc. Of the components of the shutter curtain 1', the elements other than the frames 2', 2'' and the sheet retaining member 7 (excluding the sliding members) are formed from steel, etc.

[0094] The upper portion 10 is made up of a plurality of long aggregates 2' extending in the opening width direction, a bottom member 13 (upper bottom) provided below the lowest aggregate 2', and a wide sheet 40 provided on the plurality of long aggregates 2' and the bottom member 13. The top aggregate 2' of the upper portion 10 is located at the top end of the shutter curtain 1' and has contact portions that come into contact with the upper limit switch LSU and the emergency switch EMS (see Figure 60).

[0095] The lower portion 11 is made up of a plurality of short aggregates 2'' extending in the opening width direction, a bottom member 3' (lower bottom) provided below the lowest aggregate 2'', and a narrow sheet 41 provided on the plurality of short aggregates 2'' and bottom member 3'. The lowest bottom member 3' of the lower portion 11 is located at the lower end of the shutter curtain 1' and has an abutment portion for a lower limit switch LSD provided at the lower end of the lower guide rail G2.

[0096] The intermediate section 12 comprises a first intermediate section 12A provided at the lower end of the upper section 10 adjacent to a first side in the front width direction of the upper section of the lower section 11, and a second intermediate section 12B provided at the lower end of the upper section 10 adjacent to a second side in the front 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 front width dimension of the lower section 11, and intermediate guide rails G3 are provided along the height direction on the opposing front surfaces of the first intermediate section 12A and the second intermediate section 12B to guide both widthwise ends of the lower section 11. The configuration of the intermediate section 12 will be described in detail later.

[0097] [B-2] Aggregate The configuration of the aggregate 2' in the upper portion 10 and the aggregate 2" in the lower portion 11 is the same as that of the aggregate 2 according to the first embodiment, except for the length, and the description of the aggregate 2, including the reference numerals, can be used as appropriate; for example, see FIG. 8. Specifically, the aggregates 2', 2" each have a predetermined projected width and are composed of a horizontal portion 20 extending in the opening width direction (projected direction), and abutting portions 21, 21 provided at both ends of the horizontal portion in the projected direction and extending in the opening width direction. The height dimension of the abutting portion 21 is greater than the height (thickness) of the horizontal portion 20, and an upper end 22 of the abutting portion 21 is located above an upper surface 200 of the horizontal portion 20, and a lower end 23 of the abutting portion 21 is located below a lower surface 201 of the horizontal portion 20. The contact portions 21, 21 have a facing surface 210 which is a vertical surface, and the first sheet 4A' and the second sheet 4B' are fixed in a state of being in contact with the facing surface 210, respectively.

[0098] In this embodiment, the upper ends 22 of the aggregates 2', 2" are recessed, and the recessed portion consists of a horizontal surface 220 that forms the bottom surface of the recess, an outer convex portion 221 that is located outside the horizontal surface 220 and has an inclined surface 2210, and a convex portion 222 that is located inside the horizontal surface 220. The lower ends 23 of the aggregates 2', 2" are downwardly protruding, and the convex portion consists of a horizontal surface 230 that forms the bottom 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', 2" are overlapped, the concave portion of the upper end 22 of the lower aggregate 2', 2" fits into the convex portion of the lower end 23 of the upper aggregate 2', 2".

[0099] Horizontal guide plates 24 are fixed to both longitudinal ends of the upper surfaces 200 of the horizontal portions 20 of the aggregates 2', 2"'. The tip ends of the guide plates 24 protrude beyond the longitudinal ends of the aggregates 2', 2", and a guide receiver 25 is formed on the protruding portion. The guide receiver 25 is made up of a guided groove portion 250 extending in the front direction and a wide portion 251 located on the back side of the guided groove portion 250. The description of the guide plate 24 and the guide receiver 25 in the first embodiment can be used to refer to the specific configurations of the guide plate 24 and the guide receiver 25.

[0100] The framework 2' in the upper portion 10 differs from the framework 2 according to the first embodiment in that it includes insertion portions 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 FIG. 49, the horizontal portion 20 of each framework 2' has four openings 202 formed therein, which are located on the lifting and lowering paths of the two first wires W1 and the two second wires W2. The two first wires W1 and the two second wires W2 extend in the height direction of the upper portion 10, passing through the openings 202. As shown in FIG. 60, the bottom surface 142 of the upper end member 14 also has four openings 1400 formed therein, which are located on the lifting and lowering paths of the two first wires W1 and the two second wires W2. The two first wires W1 and the two second wires W2 extend above the openings 1400.

[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 that 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 numerals, can be used as appropriate. For example, see Figures 14 to 23. Specifically, the bottom member 3' has a rectangular parallelepiped shape as a whole, including a pair of upper frames 30 extending horizontally and parallel to the opening width direction, a pair of lower frames 31 extending horizontally and parallel to the opening width direction, and vertical end plates 32 on both ends. One of the upper and lower frames 30 and 31 is located on a first side in the viewing direction, and the other of the upper and lower frames 30 and 31 is located on a second side in the viewing direction. The bottom member 3' has a truss structure, including a plurality of reinforcing members 38 extending at an angle.

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

[0103] On the upper surface 301 of the upper frame 30, convex portions 33 are formed at intervals in the width direction, adjacent to the surface with which the lower ends 23 of the upper aggregates 2" abut. In this embodiment, the convex portions 33 are provided on the upper surface 301, positioned inside the surface with which the lower ends 23 of the aggregates 2" abut. In this embodiment, a plurality of convex portions 33 are provided at intervals in the width direction of the upper surface 301 of the bottom member 3', 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 and spaced apart in the projection direction, so that when the opening is fully closed, the buffer member 34 at the lower end of the bottom member 3' comes into close contact with the floor surface FL.

[0105] End plate 32 is a vertically elongated rectangle that forms the left and right prospective surfaces of bottom member 3'. A wire fixing portion 35 is provided midway along the height of end plate 32, an upper guided portion 36 is provided on the upper side of end plate 32 and is positioned above wire fixing portion 35, and a lower guided portion 37 is provided on the lower side of end plate 32 and is positioned below wire fixing portion 35. Upper guided portion 36 and lower guided portion 37 each have a pair of guide elements; in this embodiment, upper guided portion 36 has a pair of sliding members 362, and 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 is composed of a first portion 13A located directly above the aggregate 2'' of the lower portion 11, a second portion 13B located on a first side in the width direction (length direction) of the first portion 13A, and a third portion 13C located on a second side in the width direction (length direction) of the first portion 13A. In this embodiment, the third portion 13C is formed by connecting multiple short elements via an end plate 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 portion 13D is located in the lifting path of the first wire set (two first wires W1), and the second joint portion 13E is located in the lifting path of the second wire set (two second wires W2).

[0107] 52 and 53, the bottom member 13 has a rectangular parallelepiped shape as a whole, and is made up of a pair of upper frames 130 extending horizontally in parallel with the opening width direction, a pair of lower frames 131 extending horizontally in parallel with the opening width direction, and end plates 132 at both ends (the other end of the second portion 13B and the other end of the third portion 13C). One of the upper frame 130 and the lower frame 131 is located on a first side in the facing direction, and the other of the upper frame 130 and the lower frame 131 is located on a second side in the facing direction. The first portion 13A, the second portion 13B, and the third portion 13C of the bottom member 13 are provided with a plurality of reinforcing members 139 extending at an angle, 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 vertical direction.

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

[0109] On the upper surface 1301 of the upper frame 130, convex portions 133 are formed at intervals in the width direction, adjacent to the surface with which the lower ends 23 of the upper aggregates 2' abut. In this embodiment, the convex portions 133 are provided on the upper surface 1301, positioned inside the surface with which the lower ends 23 of the aggregates 2' abut. A plurality of convex portions 133 according to this embodiment are provided at intervals in the width direction of the upper surface 1301 of the bottom member 13, but they may also be elongated members extending in the opening width direction.

[0110] On the lower surface 1311 of the lower frame 131, convex portions 134 are formed at intervals in the width direction, adjacent to the surface with which the upper ends 22 of the lower aggregates 2" abut (see Figure 61). In this embodiment, on the lower surface 1311, the convex portions 134 are provided at positions inside the surface with which the upper ends 22 of the aggregates 2" abut. In this embodiment, a plurality of convex portions 134 are provided at intervals in the width direction of the lower surface 1311 of the bottom member 13, but they may also be elongated members extending in the opening width direction.

[0111] The end plates 132 are vertical rectangular plates that form the left and right visible surfaces of the bottom member 13. A wire fixing portion 135 is provided at the height midpoint on the end plate 132 on the second side in the length direction (visible width direction) of the bottom member 13. An upper guided portion 136 and a lower guided portion 137 are provided on both end plates 132, and a guide roller 138 serving as an intermediate guide portion is provided at the height midpoint between the upper guided portion 136 and the lower guided portion 137. The guide roller 138 is located between the pair of wire fixing portions 135 on the second end plate 132.

[0112] The wire fixing portion 135 according to this embodiment is made up of a pair of wire fixing portions 135 arranged side by side in the projection direction. Each wire fixing portion 135 is adapted to have the lower end of the third wire W3 attached thereto. The wire fixing portions 135 are fixed to the end plate 132 so that their positions in the height direction can be adjusted. More specifically, the end plate 132 is formed with a long hole extending in the height direction, and the height position of the wire fixing portion 135 can be adjusted as necessary using height adjustment means 1353 (see FIG. 53). The description of the wire fixing portion 35 according to the first embodiment can be used to refer to the specific configuration of the wire fixing portion 135.

[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 used as needed. 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 of the aggregate 2 in the longitudinal direction, and the description of the guide receiving portions 25 (which include a pair of sliding members 26 and a pair of fixed members 27) can be used as needed. The description of the second guide roller 371 in the first embodiment can be used as needed for the guide roller 138.

[0114] [B-4] Seat and seat fixing structure In this embodiment, the top member 14, the plurality of aggregates 2', the bottom member 13, the plurality of aggregates 2", and the bottom member 3' all have the same projected width, and the first sheet 4A' and the second sheet 4B' are fixed with screws S2 by sheet retaining members 7 extending in the sheet width direction while abutting against the first and second visible surfaces 140 and 141 of the top member 14, the visible surfaces 210 of the aggregates 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 widthwise ends of the sheet is substantially the same as the fixing structure at both widthwise ends of the sheet 4 according to the first embodiment, and the description of the first embodiment can be used to refer to the specific configuration.

[0115] The visible width of the wide sheet 40 is greater than the visible width of the aggregate 2' and the bottom member 13, and both widthwise ends of the wide sheet 40 have extensions 42 that extend beyond both longitudinal ends of the aggregate 2' and the bottom member 13. The length of the sheet retaining member 7 that secures the wide sheet 40 is greater than the length of the aggregate 2' and the bottom member 13, and both widthwise ends of the sheet retaining member 7 protrude beyond the widthwise ends of the aggregate 2' and the bottom member 13 to form extensions 7'. The extensions 42 of the sheet 4 are secured to the extensions 7' of the sheet retaining member 7. More specifically, the extensions 42 of the sheet 4 are sandwiched between a back plate 73, which serves as a securing member, and the extensions 7' of the sheet retaining member 7, and secured with screws S3.

[0116] The apparent width of the narrow sheet 41 is larger than the apparent width of the aggregates 2" and the bottom member 3', and both widthwise ends of the narrow sheet 41 have extensions 42 that extend beyond both longitudinal ends of the aggregates 2" and the bottom member 3'. The length of the sheet retaining member 7 that secures the narrow sheet 41 is longer at its ends than the length of the aggregates 2" and the bottom member 3', and both widthwise ends of the sheet retaining member 7 protrude beyond the widthwise ends of the aggregates 2" and the bottom member 3' to form extensions 7'. The extensions 42 of the sheet 4 are secured to the extensions 7' of the sheet retaining member 7. More specifically, the extensions 42 of the sheet 4 are sandwiched between a back plate 73, which serves as a securing member, and the extensions 7' of the sheet retaining member 7, and secured with screws S3.

[0117] 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 a known sheet material. As shown in FIG. 62, the sheet 4 according to this embodiment is formed by connecting multiple strip-shaped sheets extending in the height direction in the width direction. Specifically, the multiple strip-shaped sheets include multiple first strip-shaped sheets 4000, 4000' having a first height (the total height of the shutter curtain 1') composed of wide sheets 40 and narrow sheets 41, and multiple second strip-shaped sheets 4100 having a second height composed only of wide sheets 40. The first strip-shaped sheets 4000' have one half of the first height and the other half of 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 portions of the multiple strip-shaped sheets are not located at the corner. Since the connection portions of the strip-shaped sheets 4000, 4100, 4000' extend in the sheet height direction, the impact of the sheet's own weight on the connection portions is smaller than when multiple sheets are connected in the height direction (where the connection portions extend horizontally).

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

[0119] The intermediate section 12 is a panel body having predetermined height, projection, and projection width dimensions, and its upper end is fixed to the underside 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 is composed of a panel body assembled from multiple square pipe-shaped frames (frames extending horizontally in the projection direction, frames extending horizontally in the projection direction, and frames extending vertically) corresponding to each side of a rectangular parallelepiped. A sheet 120 is attached to the projection surface of the panel body. The sheet 120 is attached to a predetermined frame of the panel body with screws using a sheet retainer member 7. The panel body according to this embodiment also includes multiple intermediate frames. An attachment piece for attachment to the lower end of the bottom member 13 is formed on the upper surface of the panel body. An attachment piece for an intermediate guide rail G3 is formed on the projection surface on the inside of the panel body.

[0120] As shown in FIG. 48A, the panel body of the intermediate section 12 (intermediate section 12B) has 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'), an upper surface (a pair of upper visible frames 125, and upper visible frames 126, 126'), and a lower surface (a pair of lower visible frames 121, and lower visible frames 122, 122'). An attachment piece 128 for the intermediate guide rail G3 is formed on the inner visible surface. An attachment piece 129 for attachment to the lower end of the bottom member 13 is formed on the upper surface.

[0121] In this embodiment, a pair of lower sight frames 121 extending horizontally in parallel in the opening width direction and a lower sight frame 122 connecting the ends of the pair of lower sight frames 121 on the side of the intermediate guide rail G3 constitute elements of a third guide means, which will be described later. An actuator 123 that activates the detection switch MS1 is provided below a predetermined position in the width direction of the intermediate section 12. A pair of buffer pieces 124 that protrude vertically downward from the lower end of the sheet 120 are provided at the lower end of the intermediate section 12 across the width direction.

[0122] The height dimension of the intermediate region 12 is approximately the same as the height dimension of the lower region 11 in the expanded or contracted state. The projected width of the intermediate region 12 is approximately the same as the projected widths of the upper region 10 and the lower region 11, so that when the opening is fully closed, the wide sheet 40, the narrow sheet 41, and the sheet 120 of the intermediate region 12 are flush with each other to form a vertical surface. In this embodiment, the projected width dimension of the first intermediate region 12A is narrow, and the projected width dimension of the second intermediate region 12B is wide.

[0123] The first intermediate section 12A and the second intermediate section 12B have facing surfaces that are spaced apart, and each facing surface is provided with an intermediate guide rail G3 extending along the height direction. As described below, 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 the lower guide rail G2 and the intermediate guide rail G3 guide both widthwise ends of the narrow lower section 11. The height dimension of the intermediate guide rail G3 in this embodiment is approximately the same as the height dimension of the intermediate section 12. In the illustrated embodiment, the lower end portion of the intermediate guide rail G3 protrudes slightly downward from 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 aggregate 2'' and bottom member 3' are positioned in the space between the intermediate guide rails G3, with the lower end (the lower end of the bottom member 3') being at approximately the same height as the lower end of the intermediate portion 12 (see Figure 37).

[0125] When the opening is fully closed, 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 side portion and the second side portion 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 Both widthwise ends of the upper portion 10 of the shutter curtain 1' according to the second embodiment are guided by left and right upper guide rails G1 provided at both widthwise ends of the upper opening, and both widthwise ends of the lower portion 11 are guided by left and right lower guide rails G2 provided at both widthwise ends 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. The upper guide rail G1, lower guide rail G2, and intermediate guide rail G3 according to the second embodiment each comprise a first guide rail 8 located approximately in the center of the projected width of the shutter curtain 1' and extending in the front direction, and a pair of second guide rails 9 located on either side of the first guide rail 8 in a plan view and extending in the front direction.

[0127] The first guide rail 8 is located approximately in the center of the projected width of the shutter curtain 1', with its base end fixed to the frame C and a guide portion at its tip end in the projected direction. The guide portion of the first guide rail 8 is equipped with a first portion 80 located approximately in the center of the projected width of the shutter curtain 1' and extending in the projected direction, and a second portion 81 extending in the projected direction at the tip of the first portion 80, and in this embodiment is T-shaped in plan view. The base end side 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 frame C by fixing the fixing piece 82 to the frame C with a bolt.

[0128] The base end of the second guide rail 9 is fixed to the frame C, and its tip end in the facing direction is located on the facing surfaces of both widthwise ends of the shutter curtain 1', so that it abuts or comes close to both widthwise ends of the sheet 4 (wide sheet 40, narrow sheet 41) from the inside. The second guide rail 9 has a first facing piece 90 on the tip side, a second facing piece 91 on the base side located inside the facing direction relative to the first facing piece 90, and a step portion 92 located between the base end of the first facing piece 90 and the tip of the second facing piece 91. The widthwise ends of the sheet 4 (wide sheet 40, narrow sheet 41) abut or come close to the outer surface of the first facing piece 90. A fixing piece 93 extending perpendicular to the second facing piece 91 is provided at the base end of the second facing piece 91, so that the second guide rail 9 as a whole is generally L-shaped in plan view. A pair of second guide rails 9 are positioned so as 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 a pair of guide elements: the guide receiving portion 25 of each aggregate 2', 2'', the upper guided portion 36 and the lower guided portion 37 of the bottom member 3', and the upper guided portion 136 and the lower guided portion 137 of the bottom member 13; and both widthwise end portions of the first sheet 4A' are positioned outside one of the second guide rails 9, and both widthwise end portions of the second sheet 4B' are positioned outside the other of the second guide rails 9. For details of the first guide mechanism equipped with the first guide rail 8 and the second guide mechanism equipped with the second guide rail 9, the description in the first embodiment can be used.

[0130] [C-2] Aligning the guide rails on the lower part The guide rails that guide both widthwise ends of the lower section 11 of the shutter curtain 1' consist of a lower guide rail G2 and an upper intermediate guide rail G3. The intermediate guide rail G3 is a movable guide rail that is located directly above the fixed lower guide rail G2 and moves up and down as the upper section 10 and the intermediate section 12 move up and down. Therefore, a guide means is provided that aligns the upper end of the fixed lower guide rail G2 attached to the frame with the lower end of the movable intermediate guide rail G3 attached to the upper section 10 when the shutter curtain 1' is closed. 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 widthwise ends of the lower section 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 abut against each other to 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 that aligns 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 that aligns 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 that is provided on the intermediate floor surface FL2 against which the lower end of the intermediate section 12 abuts, and that positions the intermediate section 12 (to which the intermediate guide rail G3 is attached) in the projection direction and / or the facing 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 latching 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 includes an attachment 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 extending downward in a flared 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 above 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 latch onto the latching portion at 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 the upper guide rail G3 in the projection direction. In this embodiment, in the fully closed state (a state in which the first guide piece 171 of the intermediate guide rail G3 is engaged with the engaged 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 (engaged portions) are formed at the upper end of the wide portion 800 of the first section 80 of the first guide rail 8 of the lower guide rail G2 (see FIG. 56A). When the intermediate section 12 descends to close the opening, the pair of inclined first guide pieces 171 of the first guide member 17 are guided by the inclined surfaces 172 and positioned in the projection direction. Because the first guide member 17 is formed on the wide portion 800 on the base end side of the first section 80 of the first guide rail 8, the guide function of the first guide rail 8 is not impaired. In the illustrated embodiment, the pair of inclined first guide pieces 171 extend linearly, but the shape of the first guide pieces 171 is not limited thereto, and may be, for example, a pair of inclined curved pieces 171' (Figure 43A) extending 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 inclined at a first angle with respect to the vertical direction (an acute angle with respect to the vertical plane) and a lower inclined portion inclined at a second angle with respect to the vertical direction (an angle more obtuse 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 end piece 90 of the second guide rail 9 of the intermediate guide rail G3, and an upper end portion of a pocket portion 94 formed in the first end piece 90 of the second guide rail 9 of the lower guide rail G2. The second guide member 18 comprises an upper fixed 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 end piece 90 of the second guide rail 9, and the fixed piece 180 of the second guide member 18 is attached to and fixed in the pocket portion 94. When the upper intermediate guide rail G3 descends from a position spaced above 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 observation piece 90 of the second guide rail 9 of the lower guide rail G2, thereby positioning the front and rear directions.

[0134] The third guide means according to this embodiment comprises a third guide member 19 provided on an intermediate floor surface FL2 against which the lower end of the intermediate section 12 abuts, and a pair of lower sight frames 121 and lower sight frames 122 of the intermediate section 12. The third guide member 19 comprises a pair of sight surfaces 190, a sight surface 191, and an upper surface 192, with the upper portions of the vertical portions of the pair of sight surfaces 190 forming inclined surfaces 1900 that slope upward toward each other, and the upper portion of the vertical portion of the sight surface 191 forming inclined surfaces 1910 that slope upward toward the other sight surface.

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

[0136] In this embodiment, when the lower end of the intermediate guide rail G3 and the upper end of the lower guide rail G2 are aligned, the inner sight surfaces of the pair of lower sight frames 121 extending horizontally in parallel in the opening width direction are close to or in sliding contact with the vertical portions of the pair of sight surfaces 190 of the third guide member 19, and when the intermediate section 12 and the intermediate guide rail G3 descend from a position spaced above the upper end of the lower guide rail G2, the inner sight surface of the lower sight frame 121 descends while being guided by the upper inclined surfaces 1900 of the pair of sight surfaces 190 of the third guide member 19, thereby positioning the sight direction.

[0137] When the lower end of the intermediate guide rail G3 and the upper end of the lower guide rail G2 are aligned, the inner projected surface of the lower projected frame 122 of the first intermediate portion 12A and the second intermediate portion 12B is close to or in sliding contact with the vertical portion of the projected surface 191 of the third guide member 19, and when the intermediate portion 12 and the intermediate guide rail G3 descend from a position spaced above the upper end of the lower guide rail G2, the inner projected surface of the lower projected frame 122 descends while being guided by the upper inclined surface 1910 of the projected surface 191 of the third guide member 19, thereby positioning the projected 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 to this. 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 for positioning in the projection direction, the intermediate section 12 may be positioned by sandwiching it from the projection direction between a pair of third guide members provided on the intermediate floor surface FL2 at a distance in the projection direction.

[0139] A microswitch is provided adjacent to the third guide member 19 provided on the intermediate floor surface FL2, and an actuator 123 is provided below the intermediate section 12 so that a detection switch MS1 turns OFF when the lower end of the intermediate section 12 is lowered to a predetermined position while being guided in the forward and backward directions. When the detection switch MS1 is OFF, it can be determined that the upper section 10 and the intermediate section have lowered 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, a total of four third guide members 19 are provided: 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 FIG. 37). However, a total of two third guide members 19 may be provided: 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. Alternatively, on 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 FIG. 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, the second wire W2, and the third wire W3 are wound 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 shutter curtain 1' rises with the bottom member 3', the plurality of aggregates 2'', the bottom member 13, and the plurality of aggregates 2' overlapping in the height direction, and the first sheet 4A' and the second sheet 4B' are folded outward on the first side and the second side, respectively, to fully open the opening. In this embodiment, the upper portion 10 and the lower portion 11 of the shutter curtain 1' have substantially the same projected dimensions. More specifically, the projected dimensions of the aggregates 2' of the upper portion 10, the bottom member 13, the aggregates 2'' of the lower portion 11, and the bottom member 3' are substantially the same (see FIGS. 41 and 61).

[0141] When the shutter curtain 1' rises, the upper end (upper surface 301) of the bottom member (lower bottom) 3' abuts against the lower end 23 of the aggregate 2'', and in the case of adjacent aggregates 2'' vertically, the upper end 22 of the lower aggregate 2'' abuts against the lower end 23 of the upper aggregate 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 lifting wire W, abuts against the horizontal surface 230 of the lower end 23 of the lowest aggregate 2'', moving that aggregate 2'' upward, and the horizontal surface 220 of the upper end 22 of that aggregate 2'' abuts against the horizontal surface 230 of the lower end 23 of the aggregate 2'' located above, moving that aggregate 2'' upward.

[0142] The upper end 22 of the uppermost aggregate 2'' of the lower part 11 moving upward abuts against the lower surface 1311 of the bottom member (upper bottom) 13 at the lower end of the upper part 10, the upper end (upper surface 1301) of the bottom member (upper bottom) 13 abuts against the lower end 23 of the aggregate 2', and between adjacent aggregates 2' in the vertical direction, the upper end 22 of the lower aggregate 2' abuts against the lower end 23 of the upper aggregate 2'. The upper surface 1301 of the upper frame 130 of the bottom member 13 moving upward due to the upward movement of the lifting wire W abuts against the horizontal surface 230 of the lower end 23 of the lowest aggregate 2', moving that aggregate 2' upward, and the horizontal surface 220 of the upper end 22 of that aggregate 2' abuts against the horizontal surface 230 of the lower end 23 of the aggregate 2' located above, moving that aggregate 2' upward.

[0143] When the bottom member 3' and the aggregate 2" directly above are overlapped, the convex portion 33 on the upper surface 301 of the bottom member 3 is located inside the downward convex portions of the lower end portions 23 of the aggregates 2" located on both sides in the projection direction. The height of the convex portion 33 in this embodiment is lower than the height of the downward convex portion of the lower end portion 23, and the portions facing the inner vertical surface 232 of the downward convex portion are the lower vertical surface 330 and the upper inclined surface 331 (see 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 aggregate 2" are displaced in the projection direction while separated from each other, the inclined surface 331 of one of the convex portions 33 will abut against the corner between the inner vertical surface 232 and the horizontal surface 230 of one of the downward convex portions, thereby restricting the displacement. If the bottom member 3' and the upper aggregate 2'' are in contact and shift in the expected direction, the vertical surface 330 of one of the convex portions 33 will come into contact with the inner vertical surface 232 of one of the downward convex portions, thereby regulating the shift.

[0144] When the aggregates 2'' in the lower portion 11 are overlapped, the horizontal surface 220 of the recessed portion 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 recessed portion 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 on the inner side of the recessed portion 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 moves upward (when the shutter curtain 1' is pulled up), if the upper and lower aggregates 2'' are shifted in the prospective direction while separated from each other, or if the upper and lower aggregates 2'' are shifted in the prospective direction while abutting against each other, the vertical surface 232 of one of the convex portions will abut against one of the inner convex portions 222, and the other inclined surface 2210 will abut against the inclined surface 231, thereby regulating the shift.

[0145] When the bottom member 13 and the aggregate 2" directly below it are overlapped, the upper ends of the inner convex portions 222 and the outer convex portions 221 of the upper end portions 22 of the aggregate 2" abut against the lower surface 1311 of the bottom member 13, and the convex portions 134 of the lower surface 1311 of the bottom member 13 are positioned opposite the inner convex portions 222 of the upper end portions 22 of the aggregates 2" located on both sides in the projection direction. The convex portions 134 of this embodiment are provided on the lower surface 1311 of the bottom member 13, on the side away from the visible surface 1310, and the side surface located on the visible surface 1310 side is formed by an upper vertical surface 1340 and a lower inclined surface 1341 that slopes from the lower end of the vertical surface 1340 in a direction away from the visible surface 1310. When the shutter curtain 1' moves upward (when the shutter curtain 1' is pulled up), if the bottom member 13 and the lower aggregate 2'' are separated and shift in the projection direction, the upper end of one of the inner convex portions 222 abuts against the inclined surface 1341 of one of the convex portions 134, thereby restricting the shift. If the bottom member 13' and the upper aggregate 2'' are in contact and shift in the projection direction, the vertical surface 1340 of one of the convex portions 134 abuts against the projection surface of one of the inner convex portions 222, thereby restricting the shift.

[0146] When the bottom member 13 and the aggregate 2' directly above are overlapped, the convex portion 133 on the upper surface 1301 of the bottom member 13 is located inside the downward convex portions of the lower end portions 23 of the aggregates 2' located on both sides in the projection direction. The height of the convex portion 133 in this embodiment is lower than the height of the downward convex portion of the lower end portion 23, and the portions facing and spaced apart from the inner vertical surface 232 of the downward convex portion 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 aggregate 2' are displaced in the projection direction while separated from each other, the inclined surface 1331 of one of the convex portions 133 abuts against the corner between the inner vertical surface 232 and the horizontal surface 230 of one of the downward convex portions, thereby restricting the displacement. If the bottom member 13 and the upper aggregate 2' are in contact and shift in the expected direction, the vertical surface 1330 of one of the convex portions 133 will come into contact with the inner vertical surface 232 of one of the downward convex portions, thereby regulating the shift.

[0147] When the aggregates 2' in the lower portion 11 are overlapped, the horizontal surface 220 of the recessed portion 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 recessed portion 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 on the inner side of the recessed portion 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' moves upward (when the shutter curtain 1' is pulled up), if the upper and lower aggregates 2' shift in the prospective direction while separated from each other, or if the upper and lower aggregates 2' shift in the prospective direction while abutting against each other, the vertical surface 232 of one of the convex portions will abut against one of the inner convex portions 222, and the other inclined surface 2210 will abut against the inclined surface 231, thereby regulating the shift.

[0148] When the opening is fully closed, the upper section 10 in the extended state closes the upper opening, the lower section 11 in the extended state closes the lower opening, and the first intermediate section 12A, the second intermediate section 12B and the upper section of the lower section 11 in the extended state close the intermediate opening. Both widthwise ends of the upper section 10 are guided by upper guide rails G1 provided on the frame, and both widthwise ends of the lower section 11 are guided by lower guide rails G2 provided on the frame and intermediate guide rails G3 provided on the first intermediate section 12A and the second intermediate section 12B.

[0149] When the opening is fully closed, the portion of the lower end of the upper section 10 located outside the first intermediate section 12A and the second intermediate section 12B is spaced apart from the upper floor surface FL1 and is not cushioned by the rail R provided on the upper floor surface FL1. No cushioning material is provided in this portion of the lower end of the upper section 10, but a cushioning material may be provided so as to avoid the rail R.

[0150] The lower end of the first intermediate section 12A abuts against the intermediate floor surface FL2 via the buffer piece 124, and the outer visible surface of the first intermediate section 12A and the intermediate side wall C1 face each other with a gap between them. The lower end of the second intermediate section 12B abuts against the intermediate floor surface FL2 via the buffer piece 124, and the outer visible surface of the second intermediate section 12B and the intermediate side wall C1 face each other with a gap between them. No guide rails are provided at either end of the width direction of the intermediate opening.

[0151] [III] Sheet shutter operation control [A] Sheet shutter according to the first embodiment The sheet shutter according to the first embodiment opens and closes an opening using a shutter curtain 1 that has the same width across the entire height of the opening. As shown in Fig. 63, the sheet shutter according to the first embodiment includes a first drive device 6A' and a second drive device 6B', and the first drive device 6A' raises and lowers the first wire W1, and the second drive device 6B' raises and lowers the second wire W2, thereby electrically raising and lowering the shutter curtain 1 and opening and closing the opening. The first drive device 6A' includes a first reel device 6A driven by a first motor M1, and the second drive device 6B' includes a second reel 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 up 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, causing the shutter curtain 1 to rise while the multiple aggregates 2 and bottom member 3 overlap in the vertical direction, and the sheets 4A and 4B are folded outward on the first and second sides, respectively, to enter a folded state, thereby fully opening the 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, causing the shutter curtain 1 to descend while the aggregate 2 and bottom member 3 separate in the vertical direction, and the sheets 4A and 4B enter an extended state in which they extend vertically in the vertical direction, and the buffer member 34 at the lower end of the bottom member 3 lands on the ground, completely closing the opening (see Figures 1, 4, and 5).

[0154] The first drive device 6A' is equipped with a first encoder ENC1, which counts the number of rotations of a predetermined rotating part of the first drive device 6A' as the number of pulses, thereby determining the amount of pull-out of the first wire W1 based on the number of pulses and detecting the position of the shutter curtain 1 at the location where the first wire W1 is attached (height position at the opening). The first encoder ENC1 can detect the upper and lower limit positions of the position of the shutter curtain 1 at the location where the first wire W1 is attached (height position at the opening). 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 device 6A' is detected based on the number of pulses.

[0155] The second drive device 6B' is equipped with a second encoder ENC2, which counts the number of rotations of a predetermined rotating part of the second drive device 6B' as the number of pulses, thereby determining the amount of pull-out of the second wire W2 based on the number of pulses and detecting the position (height position in the opening) of the shutter curtain 1 at the location where the second wire W2 is attached. The second encoder ENC2 can detect the upper and lower limit positions of the position (height position in the opening) of the shutter curtain 1 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 device 6B' is detected based on the number of pulses.

[0156] In this embodiment, the first drive unit 6A' and the second drive unit 6B' are each equipped with an inverter 1 and an inverter 2, and control the speed obtained by the first motor M1 and the second motor M2 according to predetermined settings in response 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 raising and lowering speed of the shutter curtain 1 depending on 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 raised and lowered by the first drive unit 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 raised and lowered by the second drive unit 6B'. The upper limit switch LSU1, lower limit switch LSD1, limit switch LSU2, and lower limit switch LSD2 are mechanical detection means that mechanically detect the position of the shutter curtain 1.

[0158] The sheet shutter of 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 that 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 that is raised and lowered by the second drive unit 6B'.

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

[0160] As shown in Figures 1 to 3 and 26, the two first wires W1 are wound around the respective 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 so that they can be wound up by the first winding device 6A. The first pulleys 5A are provided with first wire slack detection means WD1. When the first wire slack detection means WD1 detects slack in the first wire 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 respective 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 so that they can be wound up by the second winding device 6B. Second wire slack detection means WD2 is provided on the second pulleys 5B. 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.

[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 that the locking device 15 is in the locked state. When the engaging 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 an interlocking operation from the operation unit to operate the shutter curtain 1. The sheet shutter according to this embodiment has an interlocking mode and a single-action mode as its operating modes, with normal opening and closing being performed in the interlocking mode. The operation unit according to this embodiment is equipped with an interlocking operation unit (see Figure 73) and a single-action operation unit (see Figure 74; Figure 74 is a single-action operation unit for the second embodiment), and the interlocking mode and the single-action mode can be switched using a mode changeover switch (see Figure 74). The operation unit is provided in an operation box installed on the floor for easy operation, but in this embodiment, a maintenance operation unit is provided above the opening. Details of the operation 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 made up of a computer and has a processor, memory, input unit, and output unit. The memory stores a program that executes predetermined control in response to predetermined input. The normal operating mode is the interlock mode, in which the first drive device 6A' (first motor M1) and the second drive device 6B' (second motor M2) are driven simultaneously in response to input of an open signal, close signal, or stop signal from the interlock operation unit, thereby opening and closing the shutter curtain 1. 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 comprises a wide upper portion 10 and a narrow lower portion 11. In a more specific aspect of the second embodiment, as shown in Figures 36 and 37, the shutter curtain 1' comprises 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 portion above the lower portion 11. However, it should be noted that the aspect shown in Figure 67 shows a generalized version of the shutter curtain 1' according to the second embodiment, with the intermediate portion 12 omitted. 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' having an intermediate portion 12.

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

[0167] When opening the opening from the fully closed state, pressing the open switch SU from the interlocking operation unit drives the first motor M1 and the second motor M2 simultaneously, and the first wire W1 and the second wire W2 are wound up simultaneously onto the winding drums 60 of the first winding device 6A and the second winding device 6B, respectively, causing the lower portion 11 of the shutter curtain 1' to rise to an intermediate position with the multiple aggregates 2'' and bottom member 3' overlapping in the height direction, and the sheets 4A', 4B' (lower portion 11) to assume a folded state in which they are folded outward on the first and second sides, respectively. In this embodiment, the rise of the shutter curtain 1' is stopped when the shutter curtain 1' rises to the intermediate position. At the intermediate position, by pressing the open switch SU from the interlocking operation unit, the first motor M1, the second motor M2, and the third motor M3 are each driven simultaneously, and the first wire W1, the second wire W2, and the third wire W3 are each simultaneously wound 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 the intermediate part 12) of the shutter curtain 1' rises while the multiple aggregates 2' and bottom member 13 overlap in the vertical direction, and the sheets 4A', 4B' (upper part 10) are folded outward on the first and second sides, respectively, and the opening is fully opened (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, the second motor M2, and the third motor M3, and simultaneously unwinds the first wire W1, the second wire W2, and the third wire W3 from the winding drums 60 of the first winding device 6A, the second winding device 6B, and the third winding device 6C, respectively, causing the upper portion 10 (and middle portion 12) of the shutter curtain 1' to descend to the middle position while the aggregate 2' and bottom member 13 separate in the height direction, and the sheets 4A', 4B' (upper portion 10) to enter an extended state in which they extend perpendicularly in the height direction. In this embodiment, the descent of the shutter curtain 1' is stopped when the shutter curtain 1' descends to the middle position. In the intermediate position, by pressing the closing switch SD from the interlocking operating unit, the first motor M1 and the second motor M2 are driven simultaneously, and 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 lower part 11 of the shutter curtain 1' descends while the aggregate 2'' and bottom member 3' separate in the vertical direction, and the sheets 4A and 4B (lower part 11) enter an extended state extending vertically in the vertical direction, and the buffer member 34 at the lower end of the bottom member 3 lands, completely closing the opening (see Figure 36).

[0169] The first driving device 6A' is equipped with a first encoder ENC1, which counts the number of rotations of a predetermined rotating part of the first driving device 6A' as the number of pulses, thereby determining the amount of pull-out of the first wire W1 based on the number of pulses, and detecting the position (height position in the opening) of the shutter curtain 1' at the location where the first wire W1 is attached. The first encoder ENC1 can detect the upper and lower limit positions of the position (height position in the opening) of the shutter curtain 1' 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 driving device 6A' is detected based on the number of pulses.

[0170] The second drive device 6B' is equipped with a second encoder ENC2, which counts the number of rotations of a predetermined rotating part of the second drive device 6B' as the number of pulses, thereby determining the amount of pull-out of the second wire W2 based on the number of pulses and detecting the position (height position in the opening) of the shutter curtain 1' at the location where the second wire W2 is attached. The second encoder ENC2 can detect the upper and lower limit positions of the position (height position in the opening) of the shutter curtain 1' 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 device 6B' is detected based on the number of pulses.

[0171] The third drive device 6C' is equipped with a third encoder ENC3, which counts the number of rotations of a predetermined rotating part of the third drive device 6C' as the number of pulses, thereby determining the amount of pull-out of the third wire W3 and detecting the position (height position in the opening) of the upper portion 10 of the shutter curtain 1' at the portion where the third wire W3 is attached. The third encoder ENC3 can detect the upper limit position and lower limit position (intermediate position) of the position (height position in the opening) of the upper portion 10 of the shutter curtain 1' at the portion 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 portion 11) corresponding to the third drive device 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 an inverter 1, an inverter 2, and an inverter 3, and the speeds obtained by the first motor M1, the second motor M2, and the third motor M3 are controlled according to predetermined settings in response to the position of the shutter curtain 1' detected by the first encoder ENC1, the second encoder ENC2, and the third encoder ENC3, respectively, making it possible to change the raising 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 raised and lowered by the first drive unit 6A', an upper limit switch LSU2 and a lower limit switch LSD2 corresponding to the shutter curtain 1 corresponding to the second wire W2 raised and lowered by the second drive unit 6B', and an upper limit switch LSU3 corresponding to the shutter curtain 1' corresponding to the third wire W3 raised and lowered by the third drive unit 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 that mechanically detect 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 that the lower end of the upper portion 10 (intermediate portion 12) has landed on the intermediate floor surface when the shutter curtain 1' has descended to the intermediate portion. The intermediate bottom switch is composed of a first intermediate bottom switch BS1, a second intermediate bottom switch BS2, and a third intermediate bottom switch BS3, which are provided at positions in the opening width direction of the shutter curtain corresponding to the first wire W1, the second wire W2, and the third wire W3 that are raised and lowered by the first drive device 6A', the second drive device 6B', and the third drive device 6C' (see FIG. 67). The configuration of the intermediate bottom switches can be seen in the detection switch MS1 and the actuator 123 shown in FIG. 59.

[0175] The sheet shutter of the second embodiment is provided with a first emergency switch EMS1 that operates at a position above the upper limit switch LSU1 corresponding to the shutter curtain 1 corresponding to the first wire W1 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 corresponding to the shutter curtain 1 corresponding to the second wire W2 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 corresponding to the shutter curtain 1' corresponding to the third wire W3 raised and lowered by the third drive unit 6C'.

[0176] The sheet shutter according to the second embodiment is provided with a photoelectric sensor OS at a predetermined height below the left and right guide rails G2, and is designed to detect an obstacle (including a person) located in the opening when a light beam extending in the opening width direction is interrupted. 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 respective 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 so that they can be wound up by the first winding device 6A. The first pulley 5A is provided with first wire slack detection means WD1. When the first wire slack detection means WD1 detects slack in the first wire 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 respective 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 so that they can be wound up by the second winding device 6B. The second pulleys 5B are provided with second wire slack detection means WD2. 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.

[0179] As shown in Figure 36, the two third wires W3 are wound around the respective 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 so that they can be wound around the third winding device 6C. The third pulley 5C is provided with third wire slack detection means WD3. 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.

[0180] 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 that the locking device 15 is in the locked state. When the engaging 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', second drive unit 6B', and third drive unit 6C' are operated by operation from the operation unit to operate the shutter curtain 1. In this embodiment, the operation modes of the shutter unit include an interlocking mode and a single-action mode, and normal opening and closing is performed in the interlocking mode. The operation unit in this embodiment is equipped with an interlocking operation unit (see Figure 73) and a single-action operation unit (see Figure 74), and the interlocking mode and single-action mode can be switched using a mode changeover switch (see Figure 74). The operation unit is provided in an operation box installed on the floor for easy 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 composed of a computer and is equipped with a processor, memory, input unit, and output unit. The memory stores a program that executes predetermined control in response to a predetermined input. The normal operation mode is the interlock mode, and in response to an open signal, close signal, or stop signal input from the interlock operation unit, the first drive device 6A' (first motor M1), the second drive device 6B' (second motor M2), or 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 simultaneously driven to open and close the shutter curtain 1'. Details of the operation control by the control unit CU will be described later.

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

[0184] As shown in Fig. 73, the interlocking operation unit according to this embodiment is equipped with a common open switch SU, close switch SD, and stop switch SS. Normally, the interlocking mode is selected, and in the interlocking mode, when the shutter curtain 1 of the first embodiment is raised or lowered, and when the lower portion 11 of the shutter curtain 1' of the second embodiment is raised or lowered, the first drive device 6A' and the second drive device 6B' are operated simultaneously by operation from the interlocking operation unit, and when the upper portion 10 (and the middle portion 12) of the shutter curtain 1' of the second embodiment is raised or lowered, the first drive device 6A', the second drive device 6B', and the third drive device 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 and raising the first wire W1 and the second wire W2 at the same speed, causing the shutter curtain 1 to rise and open 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 and lowering the first wire W1 and the second wire W2 at the same speed, causing the shutter curtain 1 to fall and close the opening. When the stop switch SS is pressed, the first drive unit 6A' and the second drive unit 6B', which are in operation, stop simultaneously, stopping the lifting and lowering of the first wire W1 and the second wire W2 and stopping the shutter curtain 1 in the process of rising and falling.

[0186] When the open switch SU of the interlocking operation unit is pressed while the shutter curtain 1' according to the second embodiment is in a fully closed state, 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 simultaneously rise at the same speed, causing the shutter curtain 1' to rise to an intermediate position and opening the lower portion of the opening. In this embodiment, the shutter curtain 1' stops at the intermediate position while rising. When the open 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, causing the first wire W1, the second wire W2, and the third wire W3 to simultaneously rise at the same speed, causing the shutter curtain 1' to rise and open the opening.

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

[0188] When the stop switch is pressed, the first driving device 6A' and the second driving device 6B' that are in operation stop simultaneously, the first wire W1 and the second wire W2 stop moving up and down, and the rising and falling shutter curtain 1 stops. Alternatively, the first driving device 6A', the second driving device 6B', and the third driving device 6C' that are in operation stop simultaneously, the first wire W1, the second wire W2, and the third wire W3 stop moving up and down, and the rising and falling shutter curtain 1 stops.

[0189] As shown in Figure 73, the interlocking operation unit is equipped with an emergency stop switch ESS. In the interlocking operation unit, the open switch SU, stop switch SS, and close switch SD provided on the operation 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 are stopped. The indicator light indicating that the power is ON is turned off.

[0190] Figure 74 shows the single-action operation unit. An operation mode selector switch is provided on the operation panel of the single-action operation unit adjacent to each switch of the single-action operation unit. The operation mode selector switch can select between three modes: linked mode, single-action mode, and maintenance mode, and the linked mode is normally selected. On the maintenance operation unit CP', the operation mode selector switch can only select between linked mode and single-action mode. In other words, operation on the maintenance operation unit CP' is only possible when the operation mode on the operation unit CP is selected as maintenance mode.

[0191] Figure 74 shows a single-action operating unit according to the second embodiment, in which an up (push-end) button, a down (push-end) button, and an independent operation speed selection button are provided corresponding to the first drive unit 6A' (first motor M1), an up (push-end) button, a down (push-end) button, and an independent operation speed selection button are provided corresponding to the first drive unit 6A' (first motor M1), an up (push-end) button, a down (push-end) button, and an independent operation speed selection button are provided corresponding to the first drive unit 6B' (second motor M2), and an up (push-end) button, a down (push-end) button, and an independent operation speed selection button are provided corresponding to the first drive unit 6C' (third motor M3). When single-action mode is selected, the first drive unit 6A', second drive unit 6B', and third drive unit 6C' can be driven independently by operating the corresponding switches. In single-action mode, the first drive unit 6A', second drive unit 6B', and third drive unit 6C' can be driven independently regardless of input from the photoelectric sensor OS, emergency switches EMS1, EMS2, and EMS3, and wire slack detection devices WD1, WD2, and WD3. The single-action operation unit is typically used to adjust the widthwise height of the shutter curtain 1'. However, to raise or lower the shutter curtain 1' in single-action mode, for example, high speed can be selected and multiple open switches or multiple close switches can be pressed and held simultaneously to raise or lower the shutter curtain 1'.

[0192] In Figure 74, the single-action operating unit of the first embodiment does not have an up (push all the way) button, a down (push all the way) button, or an individual operation speed selection button corresponding to the first drive unit 6C' (third motor M3), and when the single-action mode is selected, the first drive unit 6A' and the second drive unit 6B' can be driven independently and individually by operating the individual switches corresponding to the first drive unit 6A' and the second drive unit 6B'.

[0193] Figure 75 shows multiple status lamps indicating the status of the shutter device according to the second embodiment. The three inverter abnormality lamps are lamps that light up when an abnormality occurs in inverters 1, 2, and 3 (e.g., overcurrent or abnormal heat generation). The three overwinding prevention lamps are lamps that light up when emergency switches EMS1, EMS2, and EMS3 are activated. The three encoder lamps correspond to encoders ENC1, ENC2, and ENC3. When the difference in pulse counts detected by the position comparison unit PCU exceeds a threshold, the lamp corresponding to the encoder outputting the lowest pulse count lights up. The three wire abnormality lamps correspond to wire slack detection means WD1, WD2, and WD3. They light up when the wire slack detection device is activated. The three upper limit LS lamps correspond to upper limit limit switches LSU1, LSU2, and LSU3. They light up when the upper limit switches detect a problem. The two lower limit LS lamps correspond to the lower limit switches LSD1 and LSD2 and light up when the lower limit switches are activated. The three intermediate BS lamps correspond to the intermediate bottom switches BS1, BS2, and BS3 and light up when the intermediate bottom switches are activated. The three ascending lamps light up when the drive units are winding the wires. The three descending lamps light up when the drive units are unwinding the wires. The photoelectric sensor lamp lights up when the photoelectric sensor detects something. The maintenance lamp lights up when maintenance mode is selected. The interlock lamp lights up when the crane operating in the opening is in the designated position. The two bottom lock lamps correspond to the bottom lock devices 15 at both ends of the lower width of the opening and light up when locked. The lamps shown in Figure 75 are illustrative, and lamps indicating other states may be provided. Those skilled in the art will understand that the conditions for turning on and off the lamps may be reversed depending on the lamp.Figure 75 shows multiple status lamps indicating the state of the shutter device of the second embodiment, but it will be understood by those skilled in the art that by removing all of the intermediate BS lamps and each third lamp in Figure 75, multiple status lamps indicating the state of the shutter device of the first embodiment can be obtained.

[0194] [D] Control section [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 is equipped with a processor, memory, input unit, and output unit. The memory stores programs that execute predetermined controls in response to predetermined inputs. Normally, the operation mode selector switch selects the interlocking mode, and the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) are simultaneously driven in response to input of an open signal, a close signal, or a stop signal from the interlocking operation unit, causing the shutter curtain 1 to open or 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, and the position of the shutter curtain corresponding to the second drive unit 6B' (second motor M2) is obtained by the second encoder ENC2.

[0195] The rotation speed of the first motor M1 is controlled by the inverter 1 according to a predetermined program in accordance with the position of the shutter curtain 1 detected by the first encoder ENC1, and the rotation speed of the second motor M2 is controlled by the inverter 2 according to a predetermined program in accordance with 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 is stopped.

[0196] The control unit CU includes a position comparison unit PCU, which receives a first pulse count from the first encoder ENC1 and a second pulse count from the second encoder ENC2. The position comparison unit PCU calculates the difference between the first and second pulse counts and compares the difference in pulse counts with a threshold stored in the position comparison unit PCU. If the difference is smaller than the threshold, the system is determined to be normal. If the difference is larger than the threshold, the system is determined to be abnormal. If an abnormality is detected, a predetermined control is performed. In this embodiment, if an abnormality is detected, the drive 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-action mode by a mode selector switch, and the first drive unit 6A' (first motor M1) and the second drive unit 6B' (second motor M2) are independently operated by input from the single-action operation unit, thereby eliminating the difference in pulse counts.

[0197] If the judgment result of the position comparison unit PCU is normal, the shutter curtain 1 continues to rise or fall. During the rise operation, the first upper limit switch LSU1 detects a signal, which stops the drive of the first drive unit 6A' (first motor M1), and the second upper limit switch LSU2 detects a signal, which stops the drive of the second drive unit 6B' (first motor M1).

[0198] When the shutter curtain 1 is raised, the position of the shutter curtain 1 is monitored by a first encoder ENC1 and a 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 the preset number of pulses of 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 the preset number of pulses of the second encoder ENC2.

[0199] When the part of the shutter curtain 1 corresponding to the first driving device 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 operates to stop the first driving device 6A' (first motor M1) and, if driving, the second driving device 6B' (second motor M2). When the part of the shutter curtain 1 corresponding to the second driving device 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 operates to stop the second driving device 6B' (second motor M2) and, if driving, the first driving device 6A' (first motor M1).

[0200] During the lowering operation, the first wire slack detection means WD1 corresponding to the first drive unit 6A' (first motor M1) is disabled by detection of the first lower limit switch LSD1, and the second wire slack detection means WD2 corresponding to the second drive unit 6B' (first motor M1) is disabled by detection of the second lower limit switch LSD2. When the shutter curtain 1 is lowered, the position of the shutter curtain 1 is monitored by the first encoder ENC1 and the second encoder ENC2, and the lower limit positions based on 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 first encoder ENC1 detects the lower limit position, the drive of the first drive unit 6A' (first motor M1) is stopped, and when the second encoder ENC2 detects the lower limit position, the drive of the second drive unit 6B' (first motor M1) is stopped. When the shutter curtain 1 is at its lowest stop position, the first wire W1 and second wire W2 are allowed to be in a slightly slack state because the first wire W1 and second wire W2 are disabled. This prevents the first wire W1 and second wire W2 from becoming taut in the fully closed position, and even if a strong wind blows and the shutter curtain 1 sways in the fully closed position, a large tension is not applied to the first wire W1 and second wire W2, improving the durability of the first wire W1 and 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 the photoelectric sensor OS detects it, 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 of the shutter curtain 1 is adjusted or raised and lowered by operation from the single-action 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, a reset means is provided that resets the number of pulses of each encoder when the shutter curtain 1 is in the fully closed position in the single-action mode. In this embodiment, the reset is performed by pressing and holding the stop button in the single-action 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 (detection state of the first lower limit switch LSD1, detection state of the second lower limit switch LSD2). However, as long as the encoder pulse count is reset at a predetermined opening / closing position, it is not necessarily limited to the fully closed position.

[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 has a processor, memory, input unit, and output unit. The memory stores programs that execute predetermined controls in response to predetermined inputs. Normally, the operation mode selector switch selects the interlocking mode, and in response to input of an open signal, close signal, or stop signal from the interlocking operation unit, 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 driven simultaneously, or the first drive device 6A' (first motor M1) and the second drive device 6B' (second motor M2) are driven simultaneously, causing the shutter curtain 1' to open or 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] The rotation speed of the first motor M1 is controlled by the inverter 1 according to a predetermined program in accordance with the position of the shutter curtain 1 detected by the first encoder ENC1, the rotation speed of the second motor M2 is controlled by the inverter 2 according to a predetermined program in accordance with the position of the shutter curtain 1 detected by the second encoder ENC2, and the rotation speed of the third motor M3 is controlled by the inverter 3 according to a predetermined program in accordance with the position of the shutter curtain 1 detected by the third encoder ENC3. If an abnormality is detected in any of the inverters, the operation of all the drive devices is stopped.

[0204] The control unit CU includes a position comparison unit PCU, which receives the number of pulses from the first encoder ENC1, the number of pulses from the second encoder ENC2, and the number of pulses from the third encoder ENC3. When the lower portion 11 of the shutter curtain 1′ moves up or down, the position comparison unit PCU calculates the difference between the first and second pulse counts and compares the difference in pulse counts with a threshold stored in the position comparison unit PCU. If the difference is smaller than the threshold, it is determined to be normal. If the difference is larger than the threshold, it is determined to be abnormal. When the upper portion 10 of the shutter curtain 1′ moves up or down, the position comparison unit PCU calculates the difference between the first and second pulse counts, the difference between the first and third pulse counts, and the difference between the second and third pulse counts. Each difference in pulse counts is compared with a threshold stored in the position comparison unit PCU. If all differences in pulse counts are smaller than the threshold, it is determined to be normal. If any difference in pulse count is larger than the threshold, it is determined to be abnormal.

[0205] If an abnormality is determined, predetermined control is performed. In this embodiment, if an abnormality is determined, the drive 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 driving, the drive of the first drive device 6A' (first motor M1) and the second drive device 6B' (second motor M2) is stopped, and 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 driving, the drive 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. The mode change switch switches the operating mode to single-action mode, and 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 by input from the single-action operating unit, thereby eliminating the difference in pulse number.

[0206] If the judgment result of the position comparison unit PCU is normal, the shutter curtain 1' continues its rising or falling operation. During the rising operation of the shutter curtain 1' (upper portion 10), the first upper limit switch LSU1 detects a signal to stop the driving of the first drive unit 6A' (first motor M1), the second upper limit switch LSU2 detects a signal to stop the driving of the second drive unit 6B' (first motor M1), and the third upper limit switch LSU3 detects a signal to stop the driving of the third drive unit 6C' (third motor M3).

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

[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 operates to stop the driving devices, 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 operates to stop the driving devices, 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 operates to stop the driving devices, including the third drive unit 6C' (third motor M3).

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

[0210] During the lowering operation, when the shutter curtain 1' (upper portion 10) has lowered to the intermediate position, the first driving device 6A' (first motor M1) stops driving upon detection of the first intermediate bottom switch BS1 corresponding to the first driving device 6A' (first motor M1), the second driving device 6B' (second motor M2) stops driving upon detection of the second intermediate bottom switch BS2 corresponding to the second driving device 6B' (first motor M1), and the third driving device 6C' (third motor M3) stops driving upon detection of the third intermediate bottom switch BS3 corresponding to the third driving device 6C' (third motor M3). By pressing the close switch SD of the interlocking operation unit, the shutter curtain 1', which has stopped at the intermediate position, is lowered by the first driving device 6A' (first motor M1) and the second driving device 6B' (second motor M2).

[0211] Detection by the first lower limit switch LSD1 disables the first wire slack detection means 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 corresponding to the second drive unit 6B' (second motor M2). When the shutter curtain 1 is lowered, the position of the shutter curtain 1 is monitored by the first encoder ENC1 and the second encoder ENC2, and the lower limit positions based on 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. 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' (second motor M2).

[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, 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 the single-action mode, a reset means is provided that resets the number of pulses of each encoder when the shutter curtain 1' is in the fully closed position. In this embodiment, resetting is performed by pressing and holding the stop button in the single-action operation unit, but the reset button is not limited to the stop button. In this embodiment, the number of pulses is reset to 0 when the shutter curtain 1' is in the fully closed position. As long as the number of encoder pulses is reset at a predetermined opening / closing position, the position 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 With reference to Figure 65, the process by which the shutter curtain 1 changes from the fully closed position to the fully open position will be described. Provided that the bottom lock is released, pressing the open 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 has received the wire slack detection signal, determines that an abnormality has occurred, stops driving the first drive unit 6A' and the second drive unit 6B', and stops the rise of the shutter curtain 1.

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

[0215] When the difference in the number of pulses is smaller than the threshold value, the control unit CU determines that the state is normal and continues to rise the shutter curtain 1. When the first upper limit switch LSU1 detects it, the drive of the first drive unit 6A' stops, and when the second upper limit switch LSU2 detects it, the drive of the second drive unit 6B' stops, the rise 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 the preset number of pulses of the first encoder ENC1, and 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 the preset number of pulses of the second encoder ENC2, thereby stopping the rise of the shutter curtain 1 and fully opening the opening.

[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 operates to stop the first drive device 6A' (first motor M1) and, if driving, the second drive device 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 operates to stop the second drive device 6B' (second motor M2) and, if driving, the first drive device 6A' (first motor M1).

[0218] [E-1-2] Closing operation With reference to Figure 66, we will explain the process by which the shutter curtain 1 changes from the fully open position to the fully closed position. Provided that the bottom lock is released, pressing the close switch SD on the interlocking operation unit activates the first drive unit 6A' and the second drive unit 6B', and the shutter curtain 1 descends. When either the first wire slack detection means WD1 or the second wire slack detection means WD2 detects slack in the wire, the control unit CU, which has received the wire slack detection signal, determines that an abnormality has occurred, stops driving 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 number of pulses from the first encoder ENC1 and the number of pulses from the second encoder ENC2 are constantly input to the control unit CU, and the difference in the number of pulses is calculated and compared with a threshold value. If the difference in the number of pulses is greater than the threshold value, the control unit CU determines that an abnormality has occurred, stops driving the first drive device 6A' and the second drive device 6B', and stops the lowering of the shutter curtain 1. Details of the processing steps after the lowering of the shutter curtain 1 has stopped will be described later.

[0220] When the difference in the number of pulses is smaller than the threshold value, the control unit CU determines that the condition is normal, 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 the condition is abnormal, stops driving the first drive device 6A' and the second drive device 6B', and stops the descending of the shutter curtain 1. When 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. When the first lower limit switch LSD1 detects, the first wire slack detection means WD1 is disabled, and when the second lower limit switch LSD2 detects, the second wire slack detection means WD2 is disabled.

[0221] The lower limit position based on the first encoder ENC1 and the lower limit position based on the second encoder ENC2 are located lower than the lower limit position of the first lower limit switch LSD1 and the lower limit position of the second lower limit switch LSD2, respectively. When the first encoder ENC1 detects the lower limit position, the drive of the first drive device 6A' (first motor M1) stops, and when the second encoder ENC2 detects the lower limit position, the drive of the second drive device 6B' (first motor M1) stops, and the opening becomes fully closed.

[0222] It is also possible to operate the first wire slack detection means WD1 or the second wire slack detection means WD2 without disabling them, and to stop the driving device in operation 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. In this mode, the first wire slack detection means WD1 or the second wire slack detection means WD2 functions as a sort 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 fully closed position to intermediate position) 69 and 70, the process by which the shutter curtain 1' changes from the fully closed position to the fully open position will be described. Provided that the bottom lock is released, pressing the open 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 abnormality has occurred, stops driving the first drive unit 6A' and the second drive unit 6B', and stops the rise of the shutter curtain 1'.

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

[0225] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that the state is normal, 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 control unit CU inputs a predetermined number of pulses of the first encoder ENC1, which stops the first driving device 6A', and the control unit CU inputs a predetermined number of pulses of the second encoder ENC2, which stops the second driving device 6B'. [E-2-2] Opening operation (from intermediate position to fully open position) Provided that the bottom lock is released, pressing the open switch SU on the interlocking operation unit activates the first drive unit 6A', second drive unit 6B', and third drive unit 6C', causing the shutter curtain 1' to rise. When any of the first wire slack detection means WD1, second wire slack detection means WD2, and third wire slack detection means WD3 detects wire slack, the control unit CU, which receives the wire slack detection signal, determines that an abnormality has occurred, stops driving the first drive unit 6A', second drive unit 6B', and third drive unit 6C', and stops the rise of the shutter curtain 1'.

[0226] When the shutter curtain 1' rises, the number of pulses from the first encoder ENC1, the number of pulses from the second encoder ENC2, and the number of pulses from the third encoder ENC3 are constantly input to the control unit CU, and the differences in the number of pulses are calculated and compared with thresholds. Here, the difference between the number of pulses from the first encoder ENC1 and the number of pulses from the second encoder ENC2, the difference between the number of pulses from the first encoder ENC1 and the number of pulses from the third encoder ENC3, and the difference between the number of pulses from the second encoder ENC2 and the number of pulses from the third encoder ENC3 are calculated. If any of the differences in the number of pulses is greater than the threshold, the control unit CU determines that an abnormality has occurred, stops driving the first drive unit 6A', the second drive unit 6B', and the third drive unit 6C', and stops the rise of the shutter curtain 1'. Details of the processing steps that occur after the rise of the shutter curtain 1' has stopped will be described later.

[0227] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that the condition is normal, and the shutter curtain 1' continues to rise. When the first upper limit switch LSU1 detects a signal, the drive of the first drive unit 6A' stops, when the second upper limit switch LSU2 detects a signal, the drive of the second drive unit 6B' stops, and the rise of the shutter curtain 1 stops, and when the third upper limit switch LSU3 detects a signal, the drive of the third drive unit 6C' stops, and the rise of the shutter curtain 1' stops, and the opening is 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 the preset number of pulses of 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 the preset number of pulses of the second encoder ENC2, and 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 the preset number of pulses of the third encoder ENC3, thereby stopping the rise of the shutter curtain 1' and fully opening the opening.

[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 operates to stop the first driving device 6A' (first motor M1), and, if driving, the second driving device 6B' (second motor M2) and the third driving device 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 operates to stop the second driving device 6B' (second motor M2), and, if driving, the first driving device 6A' (first motor M1) and the third driving device 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 activates and stops the third drive unit 6C' (third motor M3), and, if they are being driven, 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) 71 and 72, the flow of operations until the shutter curtain 1 changes from the fully open position to the fully closed position will be described. Provided that the bottom lock is released, pressing the close switch SD of the interlocking operation unit activates the first drive unit 6A', second drive unit 6B', and third drive unit 6C', and the shutter curtain 1' descends. When any of the first wire slack detection means WD1, second wire slack detection means WD2, and third wire slack detection means WD3 detects wire slack, the control unit CU, which has received the wire slack detection signal, determines that an abnormality has occurred, stops driving the first drive unit 6A', second drive unit 6B', and third drive unit 6C', and stops the descending of the shutter curtain 1'.

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

[0232] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that the condition is normal, 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 the condition is abnormal, and the drive of the first drive unit 6A', second drive unit 6B', and third drive unit 6C' is stopped, and the descent of the shutter curtain 1' stops. When the obstacle is removed and the photoelectric sensor OS turns OFF, the shutter curtain 1' will descend again by pressing the close switch SD again.

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

[0234] [E-2-4] Closing operation (from intermediate position to fully closed position) Provided that the bottom lock is released, pressing the close 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 lower again. When either the first wire slack detection means WD1 or the second wire slack detection means WD2 detects slack in the wire, the control unit CU, which receives the wire slack detection signal, determines that an abnormality has occurred, stops driving the first drive unit 6A' and the second drive unit 6B', and stops the lowering of the shutter curtain 1'.

[0235] When the shutter curtain 1' is lowering, the number of pulses from the first encoder ENC1 and the number of pulses from the second encoder ENC2 are constantly input to the control unit CU, and the difference in the number of pulses is calculated and compared with a threshold value. If the difference in the number of pulses is greater than the threshold value, the control unit CU determines that an abnormality has occurred, stops driving the first drive device 6A' and the second drive device 6B', and stops the lowering of the shutter curtain 1'. Details of the processing steps after the lowering of the shutter curtain 1' has stopped will be described later.

[0236] When the difference in the number of pulses is smaller than the threshold, the control unit CU determines that the condition is normal, 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 the condition is abnormal, stops driving the first drive device 6A' and the second drive device 6B', and stops the descending of the shutter curtain 1'. When 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. When the first lower limit switch LSD1 detects, the first wire slack detection means WD1 is disabled, and when the second lower limit switch LSD2 detects, the second wire slack detection means WD2 is disabled.

[0237] The lower limit position based on the first encoder ENC1 and the lower limit position based on the second encoder ENC2 are located lower than the lower limit position of the first lower limit switch LSD1 and the lower limit position of the second lower limit switch LSD2, respectively. When the first encoder ENC1 detects the lower limit position, the drive of the first drive device 6A' (first motor M1) stops, and when the second encoder ENC2 detects the lower limit position, the drive of the second drive device 6B' (second motor M2) stops, and the opening becomes fully closed.

[0238] In addition, without disabling the first wire slack detection means WD1 and the second wire slack detection means WD2, if 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, 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 currently in operation.

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

[0240] If the difference in the number of pulses calculated by the position comparison unit PCU is greater than the threshold value, all driving devices that are in operation will stop. In this embodiment, the lamp of the encoder that outputs the value corresponding to the lowest position (see Figure 75) will light up. The motion mode changeover switch switches from linked mode to single-action mode. When single-action mode is selected, the wire slack detection means is disabled. By pressing the up button corresponding to the lit encoder all the way down, the position of the shutter curtain will be adjusted until the light goes out (the difference in the number of pulses of each encoder falls within the threshold value).

[0241] The operation mode changeover switch is switched from single-action mode to interlocking mode. By pressing the open button or close button on the interlocking operation unit, the shutter curtain will rise or fall. For the subsequent operation flow, please refer to Figures 65, 66, 69 to 72.

[0242] In this embodiment, the lamp of the encoder outputting the value corresponding to the lowest position is turned on, but it is also possible to turn on the lamp of the encoder outputting the value corresponding to the highest position and adjust it using the down button. In this embodiment, when the difference in the number of pulses exceeds a threshold, the operation of the shutter curtain is stopped and the tilt of the shutter curtain is adjusted manually with the single-acting operation unit, but it is also possible to input information when the difference in the number of pulses exceeds a threshold into the control unit CU, and have the control unit CU increase or decrease the rotation speed of the drive unit selected by the inverter corresponding to the selected drive unit compared to the rotation speed of the other drive units so that the pulse numbers corresponding to the multiple drive units being driven simultaneously match (control so that the difference in the number of pulses falls within a threshold).

[0243] [Appendix 1] [Concept 1] A plurality of drive units; Multiple wires are wound and unwound by each drive unit, a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; A shutter device comprising: Each drive device is provided with an open / close position detection means for detecting the open / close position of the shutter curtain, position comparison means for comparing the open / close positions detected by the open / close 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; A shutter device comprising: [Concept 2] The control means controls the opening and closing operation of the shutter curtain based on the determination result of the determination means. 10. The shutter device of claim 1. [Concept 3] An upper limit position detecting means for detecting the upper limit position of the shutter curtain and a lower limit position detecting means for detecting the lower limit position are provided corresponding to each drive device, the control means controls each drive device based on detection by each upper limit position detection means and detection by each lower limit position detection means. A shutter device according to any one of concepts 1 and 2. [Concept 4] A wire slack detection means is provided for each drive device to detect slack in each wire, The control means stops all of the driving devices in operation when at least one of the wire slack detection means detects slack. A shutter device according to any one of concepts 1 and 2. [Concept 5] An emergency switch that operates at a position above the upper limit position is provided for each drive device, The control means stops all operating drive devices in response to detection of at least one emergency switch. 4. The shutter device of claim 3.

[0244] [Appendix 2] [Concept 1] A plurality of drive units; Multiple wires are wound and unwound by each drive unit, a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; In a shutter device comprising: an upper limit position detection mechanism that detects the upper limit position of the shutter curtain; a lower limit position detection mechanism for detecting the lower limit position of the shutter curtain; A shutter device in which the upper limit position detection mechanism and the lower limit position detection mechanism each include a first detection means that mechanically detects the position of the shutter curtain and a second detection means that electrically detects the position of the shutter curtain. [Concept 2] The upper limit position detection mechanism and the lower limit position detection mechanism are provided corresponding to each drive device. 10. The shutter device of claim 1. [Concept 3] In the upper limit position detection mechanism, the first detection means detects a first upper limit position, the second detection means detects a second upper limit position that is higher than the first upper limit position, An emergency switch that operates above the second upper limit position is provided for each drive device. 10. The shutter device of claim 2. [Concept 4] In the lower limit position detection mechanism, the first detection means detects a first lower limit position, the second detection means detects a second lower limit position that is lower than the first lower limit position, Each of the driving devices is provided with a wire slack detection means for detecting slack in the corresponding wire, Disabling a corresponding wire slack detection means in response to detection by the first detection means; In response to the detection by the second detection means, the corresponding drive device is stopped. 10. The shutter device of claim 2. [Concept 5] In the lower limit position detection mechanism, the first detection means detects a first lower limit position, the second detection means detects a second lower limit position that is lower than the first lower limit position, Each of the driving devices is provided with a wire slack detection means for detecting slack in the corresponding wire, All of the driving devices in operation are stopped in response to detection by any of the wire slack detection means, The wire slack detection means operates below the second lower limit position. 10. The shutter device of claim 2.

[0245] [Appendix 3] [Concept 1] A plurality of drive units; Multiple wires are wound and unwound by each drive unit, a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; In a shutter device comprising: The control means has a linked mode in which the plurality of drive devices operate simultaneously, and a single-action mode in which each drive device operates individually. Shutter device. [Concept 2] It is provided with a separate interlocking operation unit for the interlocking mode and a single-action operation unit for the single-action mode. 10. The shutter device of claim 1. [Concept 3] An operation mode selector switch is provided, and the selector switch can be used to switch between interlocking mode and single-action mode. A shutter device according to any one of concepts 1 and 2. [Concept 4] Each drive device is provided with an open / close position detection means for detecting the open / close position of the shutter curtain corresponding to each drive device in the interlocking mode; The control means 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 the single-action mode, the single-action operating unit adjusts the position of the shutter curtain corresponding to each drive unit. 10. The shutter device of claim 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 device to be adjusted by the single-action operation unit. 5. The shutter device of claim 4. [Concept 6] a first operating device including the interlocking operating unit, the single-action operating unit, and the selector switch is provided below the opening, a second operating device including the interlocking operating unit, the single-action operating unit, and the selector switch is provided above the opening, The changeover switch of the first operating device is capable of selecting a maintenance mode, When the maintenance mode is selected, operation of the second operating device becomes possible. 4. The shutter device of claim 3. [Concept 7] the open / close position detecting means is an encoder, In the single-action mode, a reset means is provided for resetting the number of pulses of the encoder at a predetermined opening / closing position. 5. The shutter device of claim 4.

[0246] [Appendix 4] [Concept 1] A plurality of drive units; Multiple wires are wound and unwound by each drive unit, a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; In a shutter device comprising: Each drive unit is equipped with an open / close position detection means for detecting the open / close position of the shutter curtain. the opening / closing position detecting means includes an intermediate position detecting means for detecting an intermediate position between an upper limit position and a lower limit position, Based on the detection of the intermediate position detection 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 intermediate position from the lower limit position, it is opened and closed by n (n < N) driving devices, and when the shutter curtain is at the intermediate position from 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 detection means Mechanical detection means for detecting the intermediate position when the shutter curtain descends, and Electrical detection 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 detection means) ENC2 Second encoder (opening and closing position detection means) ENC3 Third encoder (open / close 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 3rd upper limit switch LSD1 First lower limit switch LSD2 Second lower limit switch BS1 1st intermediate bottom switch BS2 Second intermediate bottom switch BS3 3rd intermediate bottom switch 15 Locking device W1 First wire W2 Second Wire W3 Third wire

Claims

1. A plurality of drive units; A plurality of wires that are wound and unwound by each driving device; a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; In a shutter device comprising: the control means has a linked mode in which the plurality of drive devices operate simultaneously and a single-action mode in which each drive device operates individually, It is provided with a separate interlocking operation unit for the interlocking mode and a single-action operation unit for the single-action mode. Shutter device.

2. Each drive device is provided with an open / close position detection means for detecting the open / close position of the shutter curtain corresponding to each drive device in the interlocking mode; The control means 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 the single-action mode, the single-action operating unit adjusts the position of the shutter curtain corresponding to each drive unit. The shutter device according to claim 1 .

3. It is equipped with a control panel that displays the operating status of the shutter curtain. The control panel displays the drive device to be adjusted by the single-action operation unit. The shutter device according to claim 2 .

4. the open / close position detecting means is an encoder, In the single-action mode, a reset means is provided for resetting the number of pulses of the encoder at a predetermined opening / closing position. The shutter device according to claim 2 .

5. A plurality of drive units; A plurality of wires that are wound and unwound by each driving device; a shutter curtain connected to the plurality of wires and raised and lowered by winding and unwinding the plurality of wires to open and close the opening; a control means for controlling the opening and closing operation of the shutter curtain; In a shutter device comprising: the control means has a linked mode in which the plurality of drive devices operate simultaneously and a single-action mode in which each drive device operates individually, An operation mode selector switch is provided, and the selector switch can be used to switch between interlocking mode and single-action mode. Shutter device.

6. The device is provided with a separate interlocking operation unit for the interlocking mode and a single-action operation unit for the single-action mode. The shutter device according to claim 5 .

7. a first operating device including the interlocking operating unit, the single-action operating unit, and the selector switch is provided below the opening, a second operating device including the interlocking operating unit, the single-action operating unit, and the selector switch is provided above the opening, The changeover switch of the first operating device is capable of selecting a maintenance mode, When the maintenance mode is selected, operation of the second operating device becomes possible. The shutter device according to claim 6 .

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