Shutter device

Abstract

This provides a shutter device that can be easily installed even in buildings where there is insufficient vertical space. [Solution] The present invention comprises a shutter curtain, a belt portion that is fixed at both ends and folded back at the lower end of the shutter curtain, suspended so as to surround the shutter curtain in the vertical direction, and supporting the shutter curtain with its folded portion, and a pulley that winds up or unwinds the shutter curtain by winding up or unwinding the belt portion on one fixed side of the belt portion, wherein the pulley is positioned so as to overlap the shutter curtain when viewed from the depth direction, while being offset from the shutter curtain in the depth direction which is perpendicular to both the vertical direction and the width direction of the shutter curtain, and a pulley that curves the path of the belt portion from the lower end position of the belt portion to the pulley is arranged between the pulley and the shutter curtain.

Description

Technical Field

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

Background Art

[0002] At the entrance of buildings such as factories, it is common to install a sheet shutter. There are various types of sheet shutters. One of them is composed of an upper frame, left and right side frames with a groove-shaped steel cross-sectional shape connected in a substantially vertical direction near both ends of the upper frame, a sheet suspended in the frame, a rotating shaft rotatably provided in the upper frame and connected to a driving means, a traction member having one end fixed to the rotating shaft and the other end fixed in the upper frame while supporting the sheet, and a core material provided in the sheet at intervals in the vertical direction and directed in the left-right direction. A sheet shutter has been proposed (for example, see Patent Document 1). According to this sheet shutter, when the rotating shaft is rotated by the driving means, the traction member is wound up by the rotating shaft, and as a result, the sheet is wound up from the lower side.

Prior Art Documents

Patent Documents

[0003] <从这里开始,以下是对专利文献1的引用格式,在英文中通常用“[Patent Document 1]”表示,这里按照原文格式保留标签内容和日文格式,仅翻译文字部分。]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above sheet shutter, the rotating shaft is arranged directly above the sheet. Therefore, it is assumed that it is difficult to install the above sheet shutter in a building without sufficient space in the vertical direction.

[0005] In view of such circumstances, the present invention aims to provide a shutter device that can be easily installed in a building without sufficient space in the vertical direction. [Means for solving the problem]

[0006] The shutter device of the present invention comprises: a shutter curtain suspended vertically at an entrance; a belt portion suspended so as to surround the shutter curtain in the vertical direction, with both ends positioned upward, and contacting the shutter curtain from below with the inner circumference of the folded portion to support the shutter curtain; and a pulley that winds up or unwinds the shutter curtain by winding or unwinding the belt portion on one side of the belt portion, thereby raising or lowering the lower end position of the belt portion in the vertical direction (hereinafter referred to as the belt-side lower end position), and opening or closing the shutter curtain. When the direction perpendicular to both width directions is defined as the depth direction, the pulley is positioned so as to overlap with the shutter curtain when viewed from the depth direction, while being offset from the shutter curtain in the depth direction, and is located above the upper end in the vertical direction of the roll portion (hereinafter referred to as the uppermost roll portion), which is the rolled portion of the shutter curtain when the shutter curtain is rolled up to the height set for the fully open state of the entrance (hereinafter referred to as the fully open height), and a pulley is positioned between the pulley and the shutter curtain in the depth direction, and the belt portion is placed over the pulley, so that the path of the belt portion from the lower end position on the belt side to the pulley is bent.

[0007] In the shutter device of the present invention, the belt portion located on the pulley side with respect to the shutter curtain is defined as the rotational drive side belt portion, and the section of the rotational drive side belt portion connecting the pulley-side end position of the contact area between the uppermost roll portion and the rotational drive side belt portion (hereinafter referred to as the roll-side contact position) to the uppermost roll portion-side end position of the contact area between the pulley surface of the pulley and the rotational drive side belt portion (hereinafter referred to as the pulley-side contact position) is defined as the suspension section, characterized in that the suspension section of the rotational drive side belt portion is either parallel to the vertical direction, or inclined with respect to the vertical direction such that the pulley-side contact position is closer to the central axis of the uppermost roll portion in the depth direction than the roll-side contact position.

[0008] The shutter device of the present invention is characterized in that, when the pulley surface of the pulley is viewed from the vertical direction, the pulley surface is positioned to overlap with the uppermost roll portion.

[0009] In the shutter device of the present invention, when the pulley is viewed from the depth direction, the pulley is positioned to overlap with the shutter curtain.

[0010] In the shutter device of the present invention, the central axis of the pulley is located above the rotation axis of the pulley in the vertical direction.

[0011] The shutter device of the present invention is characterized in that, when the pulley is viewed from the vertical direction, the pulley is positioned so as not to overlap with the uppermost roll portion.

[0012] The shutter device of the present invention further comprises a control unit for controlling the rotational speed of the pulley and a position detection unit for detecting the open / closed state of the shutter curtain, wherein the control unit reduces the rotational speed of the pulley when it detects that the shutter curtain, during winding, has opened to a predetermined height that is lower than the fully open height. [Effects of the Invention]

[0013] The shutter device of the present invention offers the excellent advantage of being easily installed even in buildings where there is insufficient space in the vertical direction. [Brief explanation of the drawing]

[0014] [Figure 1] (A) is a schematic front view of the shutter device in an embodiment of the present invention, showing the entrance fully closed by the shutter curtain. (B) is a schematic top view of the shutter device in an embodiment of the present invention. [Figure 2] (A) is a cross-sectional view taken along the FF arrow in Figure 1. (B) is a cross-sectional view taken along the GG arrow in Figure 1. [Figure 3] This is a schematic front view of a shutter device in an embodiment of the present invention, showing the shutter curtain rolled up to fully open the entrance. [Figure 4] This is a schematic front view of a shutter curtain in an embodiment of the present invention. [Figure 5] This is a schematic diagram of the internal structure of a shutter device in an embodiment of the present invention, viewed from the side, in a state where the entrance is completely closed with the shutter curtain. [Figure 6] This is a schematic diagram of the internal structure of a shutter device in an embodiment of the present invention, viewed from the side, with the shutter curtain rolled up to partially open the entrance. [Figure 7] This is a schematic diagram of the internal structure of a shutter device in an embodiment of the present invention, viewed from the side, with the shutter curtain rolled up to fully open the entrance. [Figure 8] This is a diagram to explain adjacent regions. [Figure 9] (A) and (B) are schematic diagrams of the internal structure of a modified shutter device in an comparative example of the present invention, in which the belt path bending section is omitted, as viewed from the side. [Figure 10](A) is a schematic internal structure view of the shutter device in an embodiment of the present invention as viewed from the side. (B) is a schematic internal structure view of a modification of the shutter device in an embodiment of the present invention as viewed from the side. [Figure 11] (A) and (B) are schematic internal structure views of a modification of the shutter device in an embodiment of the present invention as viewed from the side.

Embodiments for Carrying out the Invention

[0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The drawings are an example of embodiments for carrying out the invention, and in the drawings, parts denoted by the same reference numerals as those in FIG. 1 represent the same objects.

[0016] <Overall Configuration> The shutter device 1 in an embodiment of the present invention includes a support column 2, a shutter curtain 3, a belt portion 4, an opening / closing mechanism 5, a position detection unit 6, and a control unit 7.

[0017] <Support Column> Referring to FIG. 1, the support column 2 will be described below. The support column 2 has a pair of side columns 20 and a cross beam 21, and is configured, for example, in a portal shape. Examples of the portal shape include, for example, a U-shape or an arch shape. Also, the side column 20 may be read as a side frame, and the cross beam 21 may be read as an upper frame. Here, as shown in FIG. 1(A), the direction in which the pair of side columns 20 are arranged, intersecting (or orthogonal) in the vertical direction H, is defined as the door width direction W, and as shown in FIG. 1(B), the direction intersecting (or orthogonal) in the vertical direction H and the door width direction W is defined as the door depth direction D. And the door depth direction D is parallel to the depth direction of the shutter device 1.

[0018] As shown in Figures 1(A) and (B), each of the pair of side columns 20 is installed on the floor surface 102 of the building so as to extend in the vertical direction H, while abutting against the wall surface 101 around the entrance 103 of the building or a room inside the building. The vertical direction may be read as the height direction. Each of the pair of side columns 20 is installed on the floor surface 102 with a gap between them in the gate width direction W. In this case, it is preferable that each of the pair of side columns 20 is fixed to the wall surface 101 around the entrance 103 of the room inside the building using fasteners such as bolts (not shown).

[0019] Furthermore, as shown in Figures 1(A) and 2(A) and (B), each of the pair of side pillars 20 is provided with a groove 22 that is recessed in the gate width direction W and extends in the vertical direction H, on the side where each of the pair of side pillars 20 faces each other in the gate width direction W. As shown in Figure 2(A), the end regions 35, including both ends of the shutter curtain 3 in the width direction, fit into the groove 22.

[0020] As shown in Figures 2(A) and (B), the groove 22 has a first surface 220 facing one side in the gate depth direction D, a second surface 221 facing the other side in the gate depth direction D and facing the first surface 220 in the gate depth direction D, and a base surface 222 that is continuous with the first surface 220 and the second surface 221 at both ends and is located at the innermost part in the depth direction (gate width direction W) of the groove 22.

[0021] Furthermore, the groove 22 has an elastic portion 23, as shown in Figures 2(A) and (B). The elastic portion 23 extends in the vertical direction H while becoming convex in the gate depth direction D, starting from the first surface 220. The elastic portion 23 is formed of an elastic material. For example, rubber can be given as the elastic material, but it is not limited to this, and other elastic materials may be used. It is also preferable that the elastic portion 23 be provided near the entrance opening 223 of the groove 22 facing the gate width direction W. Note that the elastic portion 23 is optional, and such an embodiment is also included within the scope of the present invention.

[0022] As shown in Figure 1(A), the crossbeam 21 spans between a pair of side columns 20 and is supported by each of the side columns 20. As a result, the crossbeam 21 extends in the gate width direction W. The crossbeam 21 may also be fixed to the building structure 105 or the building ceiling surface 104 in the ceiling cavity 106 above the building ceiling surface 104, or, similar to the side columns 20, it may be fixed in contact with the wall surface 101 around the doorway 103 of a room inside the building. When the crossbeam 21 is housed in the ceiling, the space inside the ceiling can be used effectively, which is useful for buildings that do not have sufficient space in the vertical direction. The crossbeam 21 has a housing area S1 in which an opening and closing mechanism 5 can be housed. The crossbeam 21 also has an upper boundary Ph that serves as the upper limit when installing mechanical equipment such as the opening and closing mechanism 5 and shutter curtain 3. Here, the lower surface of the structure 105 is the upper boundary Ph. Therefore, the opening and closing mechanism 5 needs to be housed between the ceiling surface 104 and the upper boundary Ph.

[0023] Furthermore, the side columns 20 and the crossbeams 21 are connected using fasteners such as bolts (not shown).

[0024] The outer edge of the enclosed area S2 (see Figure 3), which is surrounded by a pair of side columns 20 and the crossbeam 21 or the building's ceiling, becomes the entrance 103 to a room inside the building. In this sense, the enclosed area S2 may be appropriately reinterpreted as an entrance area. Goods are brought into the room and shipped out of the room through the enclosed area S2.

[0025] <Shutter Curtain> Referring to Figures 1 to 4, the shutter curtain 3 will be described below. The shutter curtain 3 is formed, for example, in a sheet shape and has a shape and size that can close the entrance 103 (see Figure 3). The shutter curtain 3 is also made of a retractable material.

[0026] Furthermore, as shown in Figure 4, the shutter curtain 3 has a plurality of shafts 44 that are spaced apart along the height direction (up and down direction H) of the shutter curtain 3 and extended in the width direction (gate width direction W) of the shutter curtain 3. The shafts 44 are assumed to be made of metal, for example, but may be made of materials other than metal. The shafts 44 may be held in a storage bag (not shown) provided on one side of the sheet surface of the shutter curtain 3, for example, but there are no particular limitations on the manner of holding, and they may be held in other manners.

[0027] The shutter curtain 3 is suspended in the vertical direction H so as to close the entrance 103, with its upper edge 3h (see Figure 5) fixed to the inside of the horizontal beam 21 (upper boundary Ph). Preferably, the upper edge 3h of the shutter curtain 3 is fixed to the upper end in the vertical direction H inside the horizontal beam 21 or in its vicinity. As shown in Figure 1(A), when the shutter curtain 3 is installed, the width and height directions of the shutter curtain 3 are parallel to the gate width direction W and the vertical direction H, respectively.

[0028] Furthermore, as shown in Figure 4, in this embodiment, when the shutter curtain 3 is divided along the width direction (gate width direction W) of the shutter curtain 3, it is divided into a main region 34 in the center which has a shape and size that can close the entrance 103, and a pair of end regions 35 that are continuous with the main region 34 at both ends in the width direction (gate width direction W) of the main region 34. In this case, the pair of end regions 35 become strip-shaped regions that extend in the vertical direction H at both ends of the shutter curtain 3.

[0029] When the shutter curtain 3 is installed as described above, each of the pair of end regions 35 fits into the corresponding groove 22, as shown in Figure 2(A). Furthermore, when the pair of end regions 35 are divided along the width direction (gate width direction W) of the shutter curtain 3, they are divided into a strip-shaped shaft-containing section region 36 and a strip-shaped extension section region 37. The shaft 44 extends partway through the end region 35. The shaft-containing section region 36 is the section of the end region 35 that includes the shaft 44. In other words, the shaft-containing section region 36 is the section from the entrance opening 223 of the groove 22 to the end of the shaft 44 in the gate width direction W.

[0030] As shown in Figure 2(A), the shaft-containing section region 36 of the shutter curtain 3 abuts against the convex end surface 23A of the elastic portion 23. In particular, when the shaft 44 engages with and presses against the elastic portion 23, the elastic portion 23 elastically deforms according to the degree of pressure, increasing the degree of contact with the shaft 44. As a result, the gap between the shutter curtain 3 and the side column 20 can be reduced, improving the airtightness of the room inside the building. If the elastic portion 23 is absent, the shaft-containing section region 36 abuts against the first surface 220.

[0031] The extended section region 37 of the shutter curtain 3 extends from the boundary with the shaft-containing section region 36 along the width direction (gate width direction W) of the shutter curtain 3 to the base surface 222. The extended section region 37 abuts against the base surface 222 of the groove 22 at its own ends (both ends of the shutter curtain 3). Therefore, the gap between the extended section region 37 and the base surface 222 can be eliminated. As a result, as shown in Figure 2(A), the gap between the shutter curtain 3 and the side column 20 can be reduced, thereby improving the airtightness of the room inside the building.

[0032] Furthermore, the extended section region 37 may wear down due to friction with the base surface 222 during the process of opening and closing the shutter curtain 3. For this reason, it is preferable that the extended section region 37 be made of a material that is resistant to friction.

[0033] Preferably, the shaft-containing section region 36 is composed of a single first sheet material that is integrated with the main region 34. Preferably, the second sheet material forming the extension section region 37 is interchangeably attached to the main region 34 and the shaft-containing section region 36 of the first sheet material forming the shaft-containing section region 36. The second sheet material forming the extension section region 37 may be sewn to the end of the shaft-containing section region 36 of the first sheet material, or a detachable mechanism may be provided on both to allow for attachment and detachment.

[0034] The shutter curtain 3, configured as described above, works in cooperation with the belt section 4 and the opening / closing mechanism 5 to open and close the entrance / exit 103. As shown in Figures 5 to 7, the entrance / exit 103 is opened as the shutter curtain 3 is rolled up from below and rises. On the other hand, the entrance / exit 103 is closed as the roll section 300, which is the rolled-up part of the shutter curtain 3, is unrolled and the shutter curtain 3 descends.

[0035] <Belt section> The belt portion 4 will be described below with reference to Figures 1 and 5. As shown in Figure 1(A), in this embodiment, two belt portions 4 are provided at intervals in the gate width direction W, but it is not limited to this, and one or three or more may be provided at intervals in the gate width direction W.

[0036] As shown in Figure 5, the belt portion 4 is suspended so as to surround the shutter curtain 3 in the vertical direction H, with both ends of the belt portion 4 fixed, and folded back at the lower end of the shutter curtain 3. The belt portion 4 then supports the shutter curtain 3 by contacting it from below with the inner circumference of its folded portion. Preferably, the fixing positions of both ends of the belt portion 4 are spaced apart in the gate depth direction D, but coincide in the gate width direction W. Also, the fixing positions of both ends of the belt portion 4 may coincide or be spaced apart in the vertical direction H.

[0037] Specifically, the belt section 4 is suspended in the vertical direction H on one of the flat sections 30A of the shutter curtain 3, with its other end 21A fixed to the crossbeam 21. The belt section 4 located on one of the flat sections 30A is called the one-sided flat belt section 41. The other end 21A of the belt section 4 only needs to be located above the upper end position (uppermost end position of the roll) of the roll section 300 of the shutter curtain 3 when the entrance 103 is fully open (described later) in the vertical direction H. For example, the upper end or upper boundary Ph (see Figure 5) inside the crossbeam 21 in the vertical direction H, or the vicinity above the uppermost end position of the roll (see Figure 11(B)), are examples of locations where the belt section 4 is suspended in the vertical direction H.

[0038] The belt portion 4 has a folded portion 42 that folds back at the lower end of the shutter curtain 3 towards the other flat portion 30B of the shutter curtain 3, opposite to the one flat portion 30A. The folded portion 42 abuts the shutter curtain 3 from below on its inner circumference. The folded portion 42 is continuous with the one flat belt portion 41 at its lower end.

[0039] On the other flat section 30B side, the belt section 4 is suspended in the vertical direction H while one end of it is connected to the opening and closing mechanism 5, and is continuous with the folded-back section 42. The belt section 4 located on the other flat section 30B side is called the other flat section belt section 43.

[0040] The belt portion 4, configured as described above, contacts the shutter curtain 3 from below at the inner circumference of the folded portion 42, thereby supporting the shutter curtain 3.

[0041] <Opening and closing mechanism> The opening and closing mechanism 5 will be described below with reference to Figures 1 and 5. The opening and closing mechanism 5 raises and lowers the lower end position Q of the belt portion 4 in the vertical direction H (hereinafter referred to as the belt-side lower end position) by winding and unwinding the belt portion 4 on one side of the belt portion 4 (the side proximal to the shaft portion 504 in Figure 5). In this sense, the opening and closing mechanism 5 can be considered a lifting mechanism with respect to the belt-side lower end position Q. When the belt-side lower end position Q rises, the shutter curtain 3 is rolled up. When the belt-side lower end position Q falls, the shutter curtain 3 is unrolled. In this embodiment, the opening and closing mechanism 5 has a rotating portion 50 and a belt path bending portion 51, as shown in Figures 1(A) and (B).

[0042] <Rotating part> The rotating part 50 includes a shaft portion 504 that serves as the axis of rotation, a pulley 505 provided on the shaft portion 504, a support portion 502 that rotatably supports the shaft portion 504, and a drive portion 503 that rotates the shaft portion 504.

[0043] The shaft portion 504 is rotatably supported by the support portion 502 in a position extending in the width direction (gate width direction W) of the shutter curtain 3 within the storage area S1 inside the crossbeam 21. In this embodiment, the shaft portion 504 is provided with two pulleys 505. Each of the two pulleys 505 is fixed to the shaft portion 504 such that its own central axis and the central axis of the shaft portion 504 are coaxial. One end of each of the two belt portions 4 is fixed to each of the two pulleys 505. The bending direction of the belt portion 4 in the pulley 505 is the same as the bending direction of the belt portion 4 in the pulley 510, which will be described later.

[0044] The support portion 502 has a bearing that rotatably supports the shaft portion 504.

[0045] The drive unit 503 rotates the shaft 504 in the forward direction (first direction) and the reverse direction (second direction, opposite to the first direction). Specifically, the drive unit 503 rotates the pulley 505 together with the shaft 504. The drive unit 503 is composed of a rotation source including, for example, a motor. There may also be multiple drive units 503.

[0046] <Positional relationship between the pulley and the shutter curtain> For example, in a building, if there is sufficient space in the vertical direction H between the ceiling surface 104 and the upper boundary Ph, it is possible to position the pulley 505 directly above the shutter curtain 3. On the other hand, if there is insufficient space in the vertical direction H between the ceiling surface 104 and the upper boundary Ph, it is difficult to position the pulley 505 directly above the shutter curtain 3. This is partly due to the large vertical external dimensions of the drive unit 503. If the vertical external dimensions of the drive unit 503 are large, the rotation axis of the drive unit 503 will be significantly lower than the upper boundary Ph, resulting in a lower position for the pulley 505. If the shutter curtain 3 is positioned directly below the pulley 505, the opening height of the shutter curtain 3 will also be lower. Therefore, in this embodiment, as shown in Figure 5, both the shutter curtain 3 and the pulley 505 are positioned so that, when viewed from the gate depth direction D (depth direction of the shutter device 1), an overlapping region Kx is created between the shutter curtain 3 and the pulley 505. In other words, the pulley 505 is positioned lower than the upper edge 3h of the shutter curtain 3. This makes it possible to install the shutter curtain 3 and the rotating part 50 (pulley 505) in parallel, even if there is not enough space in the vertical direction H between the ceiling surface 104 and the upper boundary Ph. Naturally, the outer dimensions of the drive unit 503 in the vertical direction H also overlap with the vertical direction H of the shutter curtain 3, forming an overlapping region K1.

[0047] <Belt path bending section> The belt path bending section 51 bends the belt path from the folded-back section 42 to the shaft section 504 of the belt section 4 (which may also be called the rotation drive side belt section) located on the rotating section 50 side relative to the shutter curtain 3. As will be described in detail later, this belt path bending section 51 ensures that the vertical movement direction of the roll section 300 during the opening and closing operation of the shutter curtain 3 is vertical. In other words, as shown in Figures 5 to 7, the trajectory of the roll section 300 is contained within the adjacent area R adjacent to the entrance / exit 103 in the gate depth direction D. This adjacent area R corresponds to the groove section 22 (see Figure 2) that accommodates both ends of the shutter curtain 3 in the width direction.

[0048] The roll section 300 refers to the portion of the shutter curtain 3 that is rolled up and becomes a roll when it is wound up. The portion of the shutter curtain 3 that is not rolled up is defined as the non-roll section 310. The roll section 300 that is fully rolled up and has the maximum diameter is referred to here as the "uppermost roll section". The rotation drive side belt section corresponds to the other planar side belt section 43 explained in <Belt section>, so the same reference numerals will be used for the rotation drive side belt section as well. The adjacent region R refers to the region (space) that the shutter curtain 3 passes through when it is wound up while contacting the elastic section 23 (or the first surface 220 of the groove section 22 if there is no elastic section 23) or a similar portion of the side column 20, as shown in Figure 8.

[0049] Returning to Figure 5, the belt path bending section 51 has a pulley 510. The pulley 510 is located in the storage area S1 (see Figure 1) inside the crossbeam 21. Furthermore, the pulley 510 is located between the rotating section 50 and the non-rolling section 310 of the shutter curtain 3 in the gate depth direction D. In the gate width direction W, the pulley 510 is located at a position that coincides with the pulley 505 of the shaft section 504 (i.e., the same position as the belt section 4). The rotational drive side belt section 43 is placed on the pulley surface 511 from above the pulley 510. As a result, the path (position) of the rotational drive side belt section 43 from the folded section 42 to the shaft section 504 is not a straight path (straight position), but a curved path (curved position) that is convex upwards. The detailed position of the pulley 510 will be described later.

[0050] <Position detection unit> The position detection unit 6 detects the open / closed state of the shutter curtain 3, and specifically detects when the lower end position Q on the belt side is located above a predetermined height in the vertical direction H. In other words, the position detection unit 6 detects when the lower end position Q on the belt side rises and exceeds the set height. This set height is lower than the fully open position. As shown in Figure 1(A), the position detection unit 6 is provided, for example, in the groove 22 of the side column 20. The position detection unit 6 is expected to be composed of a sensor that measures the position and distance of an object by shining light emitted from a light-emitting unit onto the object and receiving the reflected light with a light-receiving unit, but is not limited to this, and may be composed of other position detection sensors.

[0051] <Department Head> The control unit 7 controls the rotational speed of the rotating part 50. Specifically, the control unit 7 controls the operation of the drive unit 503 to control the rotational speed of the shaft part 504. When the position detection unit 6 detects that the roll part 300 is located above a predetermined set height in the vertical direction H, the control unit 7 controls the rotational speed of the rotating part 50 to be lower than before the detection.

[0052] <Opening and closing operation of the shutter curtain by the opening and closing mechanism> Referring to Figures 5 to 7, the opening and closing operation of the shutter curtain 3 by the opening and closing mechanism 5 will be described below. When the pulley 505 rotates in the forward direction (counterclockwise in this embodiment) together with the shaft 504 by the drive unit 503, the belt 4 is wound onto the pulley 505. When the belt 4 is wound onto the pulley 505, the lower end position Q on the belt side rises, as shown in Figure 6. When the lower end position Q on the belt side rises, the shutter curtain 3 is rolled up from below, and a roll section 300 is formed on the lower part of the shutter curtain 3. In this embodiment, the roll section 300 is rolled up in a clockwise direction, so the roll section 300 is formed on the rotating part 50 side with respect to the non-roll section 310.

[0053] As the winding of the belt section 4 continues, the roll section 300 rises further while increasing its diameter, as shown in Figure 7. The shutter curtain 3 is then wound up to the height set as the fully open state of the entrance 103 (hereinafter referred to as the fully open height), and when the lower end position Q on the belt side reaches the corresponding position (hereinafter referred to as the fully open state corresponding position), the winding of the belt section 4 stops, and the lower end position Q on the belt side and the roll section 300 also stop rising. At this time, the diameter of the roll section 300 becomes maximum (it becomes the uppermost roll section). As an example of the fully open state corresponding position, the upper end of the entrance 103 in the vertical direction H (the lower end surface of the crossbeam 21) or its vicinity can be given, but it is not limited to this, and other positions may also be used. In other words, in the present invention, the fully open state of the entrance 103 includes not only the state in which the entrance 103 is completely open, but also the state in which it is generally open and can be considered to be fully open.

[0054] However, in this embodiment, when the position detection unit 6 detects that the lower end position Q on the belt side has exceeded a set height P which is lower than the fully open height in the vertical direction H, the control unit 7 controls the drive unit 503 so that the upward speed of the lower end position Q on the belt side is smaller than before the detection. In other words, when the lower end position Q on the belt side exceeds the set height P, the rotation speed of the shaft 504 by the drive unit 503 is reduced. This is to prevent the lower end position Q on the belt side from exceeding the fully open position due to momentum and causing the roll section 300 to collide with the belt path bending section 51. The set height P is preferably 1 / 2 or more of the distance the lower end position Q on the belt side moves from the position of the lower end position Q on the belt side in the fully closed state when the entrance / exit 103 is closed by the shutter curtain 3 to the fully open position, or preferably 3 / 4 or less of the same distance.

[0055] On the other hand, when the drive unit 503 rotates the shaft 504 in the opposite direction (clockwise in this embodiment), the belt 4 is unwound from the pulley 505. Consequently, the lower end position Q on the belt side descends.

[0056] As the lower end position Q on the belt side descends, the roll section 300 unwinds. As the lower end position Q on the belt side descends, the diameter of the roll section 300 decreases, and the proportion occupied by the non-roll section 310 of the shutter curtain 3 gradually increases (see Figure 6).

[0057] Then, once the unwinding of the belt section 4 is complete, the roll section 300 disappears from the shutter curtain 3, and the entire structure becomes a non-roll section 310. As a result, the entrance / exit 103 is completely closed by the shutter curtain 3.

[0058] <Position of pulley (belt path bending section)> The significance of the position of the pulley 510 will be explained with reference to Figure 9 (Comparative Example) and Figure 10 (Example). First, two comparative examples are shown in Figure 9. In the comparative example, a hypothetical opening and closing mechanism 5 is shown in which the pulley 510 (belt path bending section 51) is omitted. In the absence of the pulley 510, the trajectory of the roll section 300 during the opening and closing operation of the shutter curtain 3 changes depending on the distance M in the gate depth direction D between the fixed position of the other end 21A of the belt section 4 and the position of the pulley 505 that winds up one side of the belt section 4.

[0059] As shown in the first comparative example in Figure 9(A), if this distance M is large, the roll section 300 will shift away from the entrance / exit 103 towards the opening / closing mechanism 5 (rotating section 50) as it rises. As a result, when the lower end position Q on the belt side reaches the position corresponding to the fully open state, the roll section 300 will extend beyond the adjacent area R adjacent to the entrance / exit 103 and attempt to move to an unnaturally shifted position in front of the entrance / exit 103. In reality, it is presumed that both ends of the roll section 300 will interfere with the groove section 22 (see Figure 2), causing it to stop midway through its rise.

[0060] As shown in the second comparative example in Figure 9(B), if the rotating part 50 is brought closer by the shutter curtain 3 to reduce the distance between them, the trajectory of the roll part 300 will be contained within the adjacent area R adjacent to the entrance / exit 103. However, if the roll part 300 is raised to a higher position, there is a risk that the roll part 300 will collide with the opening / closing mechanism 5. In order to avoid this risk, the roll part 300 must be stopped at a lower position, which means that the full opening height of the entrance / exit cannot be sufficiently secured.

[0061] Therefore, in Figure 10(A), which represents this embodiment, in order to avoid interference between the shutter curtain 3 and the rotating part 50 while keeping the trajectory of the roll part 300 within the adjacent region R, a pulley 510 (belt path bending part 51) is provided, and the shutter curtain 3 and the pulley 505 are arranged in parallel so that they overlap in the overlapping region Kx. On the other hand, the pulley 510 is positioned above the upper end of the uppermost roll part 300 in the vertical direction H. Here, the pulley 510 is provided at the upper boundary Ph. When the rotation drive side belt part 43 is placed on the pulley surface 511 from above the pulley 510, the path (position) of the rotation drive side belt part 43 from the folding part 42 to the shaft part 504 is folded back in the vertical direction by the pulley 510. In other words, the path (position) of the rotation drive side belt part 43 becomes a curved path (bent position) that is convex upward.

[0062] When the lower end position Q on the belt side reaches the fully open position, the section connecting the end position on the pulley 510 side of the contact area between the rotating drive belt section 43 and the roll section 300 (hereinafter referred to as the roll side contact position) F to the end position on the roll section 300 side of the contact area between the rotating drive belt section 43 and the pulley surface 511 of the pulley 510 (hereinafter referred to as the pulley side contact position) G is defined as the suspension section. It is preferable that the posture of the belt piece 43A corresponding to this suspension section is parallel to the vertical direction H, or that the pulley side contact position G is located closer to the central axis of the roll section 300 (or towards the entrance / exit 103 side in the gate depth direction D, or towards the other end 21A side of the belt section 4) than the roll side contact position F is inclined with respect to the vertical direction H. When the belt piece 43A is in the latter position, as shown in Figure 10(A), when viewed from the vertical direction H, the pulley surface 511 of the pulley 510 and the roll section 300 have an overlapping region (overlapping region) K2. If the position of the belt piece 43A satisfies the above conditions, during the opening and closing operation, the roll section 300 is moved towards the entrance / exit 103 side by the belt section 4, thereby enabling smooth vertical movement.

[0063] On the other hand, as shown in the modified example of this embodiment in Figure 10(B), when the lower end position Q on the belt side reaches the position corresponding to the fully open state, the posture of the belt piece 43A may be such that the contact position F on the roll side is closer to the central axis of the roll section 300 (or to the entrance / exit 103 side in the gate depth direction D, or to the other end 21A side of the belt section 4) than the contact position G on the pulley side. In this case, even with the pulley 510 (belt path bending section 51), the roll section 300 is moved towards the rotating section 50 side by the belt section 4. Since some movement of the roll section 300 toward the rotating section 50 side is permitted, this modified example can also be implemented. However, if this amount of movement is large, it will interfere with the groove section 22 (see Figure 2), so care must be taken with the mounting position of the pulley 510.

[0064] Furthermore, in order to prevent the roll section 300 from colliding with the pulley 510 due to the momentum causing the lower end position Q of the belt side to exceed the position corresponding to the fully open state, it is preferable to position the pulley 510 as far upward as possible. Therefore, it is preferable that the diameter of the pulley 510 be smaller than the vertical outer dimension of the drive unit 503, smaller than the diameter of the roll section 300 that stops at the top, and smaller than the maximum diameter of the belt section 4 when it is fully wound onto the pulley 505. As a result, as shown in Figures 10(A) and (B), the central axis of the pulley 510 can be positioned above the rotation axis of the rotating unit 50 in the vertical direction H.

[0065] As shown in the modified example of this embodiment in Figure 11, a stopper 52 may be provided between the upper end of the roll section 300, which is located at the uppermost position in the vertical direction H, and the pulley 510, and in a position that does not interfere with the belt section 4. This stopper 52 contacts the roll section 300 and prevents it from rising any further. In this case, the central axis of the pulley 510 may be positioned below the rotation axis of the rotating section 50 in the vertical direction H. The presence of the stopper 52 increases the degree of freedom in the vertical positioning of the pulley 510.

[0066] Furthermore, in order to prevent the roll section 300 from colliding with the rotating section 50, it is preferable that when the uppermost roll section 300 and the rotating section 50 are viewed from the vertical direction H, the roll section 300 and the pulley 505 do not have any overlapping areas.

[0067] It should be noted that the shutter device of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. Furthermore, shutter devices constructed by freely combining the parts described above are naturally included within the scope of the present invention. [Explanation of Symbols]

[0068] 1. Shutter device 2 pillars 3. Shutter Curtain 4 Belt section 5. Opening and closing mechanism 6 Position detection unit 7 Control Unit 20 side pillar 21 Crossbeam 22 Groove 23 Elastic part 23A Tip surface 30A flat part 30B Flat part 34 Main area 35 End area 36 Axial rod containing section area 37 Extended Section Area 41 One-sided flat belt section 42 Folded section 43 Other flat side belt section (rotation drive side belt section) 43A Belt piece 44 shaft rod 50 Rotating part 51 Belt path bending section 52 Stopper 101 Wall surface 102 Floor surface 103 Entrance / Exit 220 Front page 221 Second side 222 Basal plane 223 Entrance opening 300 Roll Section 310 Non-roll section 502 Support part 503 Drive Unit 504 Shaft 505 Pulley 510 Pulley 511 Pulley surface D Gate depth direction F Roll side contact position G Pulley side contact position H Vertical direction P Setting height Q: Lower end position of the belt side R adjacent region S1 Containment Area S2 enclosing area W Gate width direction

Claims

1. A shutter curtain that is suspended vertically at the entrance, With both ends positioned upwards, the belt portion is folded back at the lower end of the shutter curtain in the vertical direction and suspended so as to surround the shutter curtain in the vertical direction, and the inner circumference of the folded portion abuts against the shutter curtain from below to support the shutter curtain, A pulley that winds up or unwinds the shutter curtain by winding or unwinding the belt on one side of the belt, thereby raising or lowering the lower end position of the belt in the vertical direction (hereinafter referred to as the belt-side lower end position), and winding or unwinding the shutter curtain, opens and closes the shutter curtain. Equipped with, When the direction perpendicular to both the vertical direction and the width direction of the shutter curtain is defined as the depth direction, the pulley is positioned so as to overlap with the shutter curtain when viewed from the depth direction, while being offset in the depth direction relative to the shutter curtain. When the shutter curtain is rolled up to the height set as the fully open state of the entrance (hereinafter referred to as the fully open height), a pulley is positioned above the upper end in the vertical direction of the rolled portion of the shutter curtain (hereinafter referred to as the uppermost roll portion), and between the pulley and the shutter curtain in the depth direction. A shutter device characterized in that the belt portion is placed over the pulley, and the path of the belt portion from the lower end position on the belt side to the pulley is bent.

2. The belt portion located on the pulley side relative to the shutter curtain is defined as the rotational drive side belt portion. When defining the suspension section as the section of the rotational drive belt that connects the end position on the pulley side of the contact area between the uppermost roll section and the rotational drive belt section (hereinafter referred to as the roll-side contact position) to the end position on the uppermost roll section side of the contact area between the pulley surface of the pulley and the rotational drive belt section (hereinafter referred to as the pulley-side contact position), The suspension section of the rotational drive belt portion is characterized in that it is parallel to the vertical direction, or inclined with respect to the vertical direction such that the pulley-side contact position is closer to the central axis of the uppermost roll portion in the depth direction than the roll-side contact position. The shutter device according to claim 1.

3. When the pulley surface of the pulley is viewed from the aforementioned vertical direction, the pulley surface is positioned to overlap with the uppermost roll portion. The shutter device according to claim 1.

4. When the pulley is viewed from the depth direction, it is characterized in that it is positioned to overlap with the shutter curtain. The shutter device according to claim 1.

5. The central axis of the pulley is located above the axis of rotation of the pulley in the vertical direction. The shutter device according to claim 1.

6. When the pulley is viewed from the above and below, it is characterized in that it is positioned so as not to overlap with the uppermost roll portion. The shutter device according to claim 1.

7. A control unit for controlling the rotational speed of the pulley, A position detection unit for detecting the open / closed state of the shutter curtain, Equipped with, The control unit is characterized by reducing the rotation speed of the pulley when it detects that the shutter curtain, during the winding operation, has opened to a predetermined height that is lower than the fully open height. The shutter device according to claim 1.

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