Curtain unit and sheet shutter

Abstract

To provide a curtain unit capable of preventing an engaging element arranged closest to a winding roll side in a sheet curtain among a plurality of engaging elements attached to side end portions on both sides of the sheet curtain from pushing up the engaging element of the sheet curtain wound in a second turn radially outward of the winding roll when the sheet curtain is wound a plurality of times on the winding roll.SOLUTION: A curtain unit includes: a sheet curtain that is wound around a winding roll; a plurality of engaging elements that are attached to a folded-back part made by folding both side end portions of the sheet curtain along a winding direction by the winding roll, in which the plurality of engaging elements engage with a gear member to transmit a driving force that moves the sheet curtain up and down; and a reinforcement that is provided along the plurality of engaging elements in the winding direction with respect to the inside of the folded portion and extended toward the winding roll side over the engaging element located closest to the winding roll side in the sheet curtain among the plurality of engaging elements.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a curtain unit and a sheet shutter.

Background Art

[0002] Patent Document 1 discloses a sheet shutter having a frame composed of an upper frame and side frames, a rotating shaft rotatably provided in the upper frame and connected to driving means, a sheet suspended from the rotating shaft so as to be wound up and unwound freely, and a plurality of guide blocks provided at both left and right ends of the sheet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a sheet shutter, for example, a configuration is conceivable that includes a sheet curtain wound around a winding roll, a plurality of engaging members attached to both side end portions of the sheet curtain along the winding direction by the winding roll, and a gear member that rotates forward and backward in an engaged state with the engaging members to wind up or unwind the sheet curtain around the winding roll and move the sheet curtain up and down.

[0005] In this configuration, when the sheet curtain is wound around the winding roll multiple times, a plurality of engaging members are arranged to overlap in the radial direction of the winding roll. When the sheet curtain is wound around the winding roll multiple times, among the plurality of engaging members, the engaging member arranged closest to the winding roll side in the sheet curtain may project outward in the radial direction of the winding roll and push up the engaging member of the sheet curtain wound in the second round outward in the radial direction of the winding roll. Thus, when the engaging member is pushed up outward in the radial direction of the winding roll, a load is applied to the engaging member and the sheet curtain, and the engaging member and the sheet curtain may be damaged.

[0006] An object of the present disclosure is to suppress a situation where, when a sheet curtain is wound around a winding roll multiple times, among a plurality of engaging members attached to both side end portions of the sheet curtain, the engaging member arranged closest to the winding roll side in the sheet curtain pushes up the engaging member of the sheet curtain wound in the second round outward in the radial direction of the winding roll.

Means for Solving the Problem

[0007] The curtain unit according to the first aspect includes a sheet curtain wound around a winding roll, and a plurality of engaging members attached along the winding direction by the winding roll to a folded-back portion obtained by folding back both side end portions of the sheet curtain, and to which a driving force for moving the sheet curtain up and down by engaging with a gear member is transmitted, and a reinforcing member provided in the folded-back portion along the plurality of engaging members in the winding direction and extending further toward the winding roll side than the engaging member arranged closest to the winding roll side in the sheet curtain among the plurality of engaging members.

[0008] According to the above configuration, the reinforcing member provided in the folded-back portion obtained by folding back both side end portions of the sheet curtain along the plurality of engaging members in the winding direction by the winding roll extends further toward the winding roll side than the engaging member arranged closest to the winding roll side in the sheet curtain among the plurality of engaging members (hereinafter referred to as the "roll-side engaging member").

[0009] Therefore, when the sheet curtain is wound around the winding roll multiple times, the reinforcing member is wound around the winding roll before the roll-side engaging member.

[0010] As a result, a plurality of engaging members including the roll-side engaging member are wound around the winding roll following the reinforcing member, making it difficult for the roll-side engaging member to project outward in the radial direction of the winding roll.

[0011] For this reason, the roll-side engaging member is suppressed from pushing up the engaging member of the sheet curtain wound in the second round outward in the radial direction of the winding roll. As a result, damage to the engaging member and the sheet curtain is suppressed.

[0012] In the curtain unit according to the second aspect, in the first aspect, it is provided along the plurality of engaging members in the winding direction with respect to the surface facing the outside in the radial direction in the winding state of the sheet curtain by the winding roll, and projects from the surface in the thickness direction of the sheet curtain more than the plurality of engaging members, and includes an overhanging portion extended further toward the winding roll side than the engaging member disposed closest to the winding roll side in the sheet curtain among the plurality of engaging members.

[0013] According to the above configuration, it is provided in the winding direction by the winding roll along the plurality of engaging members with respect to the surface facing the outside in the radial direction (hereinafter referred to as the "outer surface") in the winding state of the sheet curtain by the winding roll, and the overhanging portion that projects more than the plurality of engaging members from the outer surface in the thickness direction of the sheet curtain is extended further toward the winding roll side than the roll-side engaging member.

[0014] Therefore, when the sheet curtain is wound around the winding roll multiple times, the overhanging portion is wound around the winding roll before the roll-side engaging member.

[0015] And since the overhanging portion projects more than the plurality of engaging members from the outer surface in the thickness direction of the sheet curtain, when the inner surface on the opposite side of the outer surface of the sheet curtain wound in the second round approaches the sheet curtain wound in the first round, the overhanging portion contacts the inner surface and the approach is restricted.

[0016] Therefore, since the engaging member of the sheet curtain wound up in the second round moves away from the roll-side engaging member, the roll-side engaging member is suppressed from pushing up the engaging member of the sheet curtain wound up in the second round to the outside in the radial direction of the winding roll. As a result, damage to the engaging member and the sheet curtain is suppressed.

[0017] The sheet shutter according to the third aspect includes the curtain unit described in the first aspect or the second aspect, and a gear member that engages with the engaging member and moves the sheet curtain up and down by forward and reverse rotation.

[0018] According to the above configuration, the sheet curtain is moved up and down by the forward and reverse rotation of the gear member engaged with the engaging member. Thereby, the sheet curtain can open and close an opening or the like.

Advantages of the Invention

[0019] Since the present disclosure has the above configuration, when the sheet curtain is wound around the winding roll a plurality of times, among the plurality of engaging members attached to the side end portions on both sides of the sheet curtain, the engaging member disposed closest to the winding roll side in the sheet curtain can be suppressed from pushing up the engaging member of the sheet curtain wound up in the second round to the outside in the radial direction of the winding roll, and has an excellent effect.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0021] Hereinafter, an example of an embodiment according to the present disclosure will be described with reference to the drawings.

[0022] (Sheet shutter 10) First, the configuration of the sheet shutter 10 according to this embodiment will be described. FIG. 1 is a perspective view showing the schematic configuration of the sheet shutter 10 according to this embodiment.

[0023] In addition, the arrow UP in each figure including FIG. 1 indicates the upper side (specifically, vertically upward) of the sheet shutter 10. Hereinafter, the direction indicated by the arrow LH in each figure including FIG. 1 will be described as the left side of the sheet shutter 10, and the direction opposite to the direction indicated by the arrow LH will be described as the right side of the sheet shutter 10. Further, the direction indicated by the arrow RR in each figure including FIG. 1 will be described as the rear side of the sheet shutter 10, and the direction opposite to the direction indicated by the arrow RR will be described as the front side of the sheet shutter 10.

[0024] In addition, when the left - right direction of the sheet shutter 10 is referred to as the "shutter width direction", and when the front - rear direction of the sheet shutter 10 is referred to as the "shutter depth direction". Note that the above - mentioned left side, right side, front side, and rear side are directions defined for convenience of explanation, so the configuration of the sheet shutter 10 is not limited to these directions.

[0025] The sheet shutter 10 shown in Fig. 1 is applied to, for example, an entrance 102 (an example of an opening) of a room such as a freezer, a refrigerator, and a warehouse, and is a shutter capable of opening and closing the entrance 102. In Fig. 1, the sheet shutter 10 in a state where the entrance 102 is closed is shown. Hereinafter, closing the entrance 102 may be referred to as "closing", and opening the entrance 102 may be referred to as "opening".

[0026] The sheet shutter 10 may be applied to, for example, an entrance and exit of a building and an opening of a window, and can be applied to an opening to be opened and closed. Specifically, the opening to which the sheet shutter 10 is applied is formed in a side wall or the like of a structure and is an opening that opens in the lateral direction (side).

[0027] In the present embodiment, the sheet shutter 10 is configured symmetrically with respect to the center line CL11 of the sheet shutter 10 in the shutter width direction. That is, the sheet shutter 10 is configured symmetrically left and right.

[0028] Specifically, as shown in Fig. 1, the sheet shutter 10 includes a frame 12, a curtain unit 30 having a sheet curtain 32, a winding roll 20, and a drive roll 60. Further, as shown in Fig. 2, the sheet shutter 10 includes a gear member 64 and a contact block 80. Hereinafter, the configuration of each part of the sheet shutter 10 will be described.

[0029] (Frame 12) As shown in Fig. 1, the frame 12 includes a pair of side frames 22, a shutter case 18, and a pair of guide rails 14 (see Fig. 2). The pair of side frames 22 extend along the vertical direction on the left and right sides with respect to the entrance 102. The pair of side frames 22 have, for example, rear surfaces 22B fixed to wall surfaces (not shown) on the left and right side edges with respect to the entrance 102.

[0030] The side frame 22 has a U-shaped cross section when cut in a direction orthogonal to its longitudinal direction, with the inner side in the shutter width direction (i.e., the side closer to the center line CL11 in the shutter width direction of the sheet shutter 10) being open (see FIGS. 2 and 5).

[0031] As shown in FIG. 2, each of the pair of guide rails 14 is arranged vertically inside each of the pair of side frames 22. The guide rail 14 has a U-shaped cross section when cut in a direction orthogonal to its longitudinal direction, with the inner side in the shutter width direction being open. Further, a pair of flange portions 16 are formed on the inner side of the guide rail 14 in the shutter width direction so as to narrow the opening width (see FIG. 5). Also, the upper ends of the guide rail 14 and the side frame 22 are open upward.

[0032] And inside the guide rail 14, a plurality of engaging members 40 provided in the curtain unit 30, which will be described later, are inserted so as to be movable in the vertical direction. The pair of guide rails 14 guide the plurality of engaging members 40 in the vertical direction so that the curtain unit 30 (specifically, the sheet curtain 32) moves in the vertical direction.

[0033] As shown in FIG. 1, the shutter case 18 is arranged along the shutter width direction so as to connect the upper ends of the pair of side frames 22. This shutter case 18 projects forward with respect to the pair of side frames 22. In the present embodiment, for example, the rear surface 18B of the shutter case 18 is fixed to the wall surface (not shown) at the upper edge of the loading entrance 102.

[0034] Furthermore, the shutter case 18 is formed in a box shape, and the inside of the shutter case 18 is hollow. The inside of the shutter case 18 communicates with the inside of the pair of side frames 22 and the inside of the pair of guide rails 14 through the openings at the upper ends of the pair of side frames 22 and the upper ends of the pair of guide rails 14.

[0035] (Take-up roll 20) The take-up roll 20 shown in Fig. 2 is a roll for taking up the sheet curtain 32. As shown in Fig. 2, this take-up roll 20 is arranged along the shutter width direction on the front side inside the shutter case 18. Further, the take-up roll 20 is rotatably supported with respect to a support portion (not shown) such as a side plate arranged inside the shutter case 18, with the shutter width direction as the axial direction. Furthermore, one end portion of the sheet curtain 32 is attached to the take-up roll 20. The said one end portion is the upper end portion in a state where the sheet curtain 32 closes the carry-in port 102 (hereinafter referred to as the "closed state").

[0036] Then, the take-up roll 20 is biased by a biasing member (not shown) so as to rotate in the direction of taking up the sheet curtain 32 (hereinafter referred to as the "take-up direction"). Thereby, a force in the take-up direction (specifically, upward) acts on the sheet curtain 32 by the take-up roll 20.

[0037] (Curtain unit 30) The curtain unit 30 shown in Fig. 1 has a function as an opening / closing portion capable of opening and closing the carry-in port 102. Specifically, as shown in Fig. 2, the curtain unit 30 has a sheet curtain 32, a pair of wires 36 (see Figs. 5 and 6), a plurality of engaging elements 40, and a projecting portion 90 (see Figs. 6 and 7). Hereinafter, the configuration of each part of the curtain unit 30 will be described.

[0038] (Sheet curtain 32 and wire 36) The sheet curtain 32 shown in Fig. 2 functions as a sheet curtain main body capable of opening and closing the carry-in port 102 by moving in the vertical direction below the drive roll 60 and the gear member 64. Hereinafter, the moving direction of the sheet curtain 32 will be referred to as the "sheet moving direction".

[0039] The sheet curtain 32 is rectangular in shape with a length in the winding direction (i.e., the sheet movement direction). As described above, one end portion in the longitudinal direction is attached to the winding roll 20. In the state where the sheet curtain 32 is unwound from the winding roll 20, it hangs down by its own weight and closes the carry-in port 102. The sheet curtain 32 is disposed between the pair of side frames 22 as shown in FIG. 1 in the closed state.

[0040] Furthermore, the sheet curtain 32 is formed in a sheet shape in which the depth direction of the shutter in the closed state is the thickness direction. The sheet curtain 32 is formed of, for example, a resin material and has flexibility that can be deformed into a roll shape along the outer periphery of the winding roll 20 to be wound. Note that as long as the sheet curtain 32 has such flexibility, the material of the sheet curtain 32 is not limited to the resin material, and various materials can be used.

[0041] Also, the side end portions on both sides of the sheet curtain 32 are specifically folded back as shown in FIGS. 5 and 6. In other words, the sheet curtain 32 has a folded-back portion 35 in which the side end portions on both sides thereof are folded back. In the folded-back portion 35, the folded-back side end portion is fused to another portion that overlaps in the sheet curtain 32. Thereby, a cavity portion 32a is formed in the side end portion (i.e., the folded-back portion 35) of the sheet curtain 32. FIGS. 5 and 6 show the right end side portion of the sheet curtain 32, but the left end side portion of the sheet curtain 32 is configured in the same manner.

[0042] The wire 36 is an example of a reinforcing material and is disposed inside the folded-back portion 35 (i.e., the cavity portion 32a). Therefore, the wire 36 is provided at each of the side end portions on both sides of the sheet curtain 32. The wire 36 is formed by twisting a plurality of elementary wires such as steel wires. In this way, since the wire 36 is disposed in the cavity portion 32a, the side end portions on both sides of the sheet curtain 32 bulge in the thickness direction of the sheet curtain 32 as compared with other portions. The arrangement of the wire 36 will be described later.

[0043] (Engaging element 40, screw 38) The engaging element 40 is attached to both side end portions (i.e., the folded-back portions 35) on both sides of the sheet curtain 32, and as shown in FIGS. 3 and 6, a plurality of engaging elements 40 are arranged along the moving direction of the sheet curtain 32. In other words, a plurality of engaging elements 40 are arranged along the winding direction of the sheet curtain 32. Although FIGS. 3 and 6 show the right end side portion of the sheet curtain 32, the left end side portion of the sheet curtain 32 is similarly configured.

[0044] The engaging element 40 is integrally formed using a resin material (in this embodiment, polyacetal (POM)). Further, in a state where the engaging element 40 is disposed inside the guide rail 14, as shown in FIG. 5, when viewed from above, the engaging element 40 has a rectangular shape in which a U-shaped groove portion 42 with an inner side in the shutter width direction opening is formed. Further, protrusions 44 are respectively formed at the opening ends of the groove portion 42. Although FIG. 5 shows the engaging element 40 disposed at the right end side portion of the sheet curtain 32, the engaging element 40 disposed at the left end side portion of the sheet curtain 32 is similarly configured.

[0045] In the inner portion of the groove portion 42 in the shutter width direction, when viewed from above, a gradually changing portion 42a with an opening width gradually widening toward the inner side in the shutter width direction is formed. Also, in the outer portion of the groove portion 42 in the shutter width direction (the side away from the center line CL11 of the sheet shutter 10 in the shutter width direction), when viewed from above, an elliptical circular portion 42b with an opening width widened is formed. Both end side portions of the sheet curtain 32 bulged by the wire 36 in the shutter width direction are disposed in this circular portion 42b (see FIG. 5).

[0046] Furthermore, the engaging member 40 is formed with a side surface 40a facing the outside in the shutter width direction and a circular through-hole 46 passing through from the side surface 40a to the circular portion 42b of the groove portion 42. An enlarged-diameter portion 46a whose diameter dimension gradually expands toward the outside in the shutter width direction is formed in the portion of the through-hole 46 on the outside in the shutter width direction. As shown in FIG. 5, a screw 38 is inserted into the through-hole 46 from the outside in the shutter width direction, and the tip-side portion of the screw 38 is twisted into the wire 36, whereby the engaging member 40 is attached to the side end portions on both sides of the sheet curtain 32.

[0047] Furthermore, as shown in FIG. 4, the engaging member 40 is formed with a contact portion 50 that contacts the contact block 80 and an engaging portion 54 that engages with an engaging recess 66 of a gear member 64 provided on the drive roll 60. The engaging member 40 engages with the gear member 64 and transmits a driving force for moving the sheet curtain 32 up and down.

[0048] The screw 38 is a dish-shaped tapping screw. As shown in FIG. 5, with the tip-side portion of the screw 38 twisted into the wire 36, the head of the screw 38 is disposed in the enlarged-diameter portion 46a of the through-hole 46. Thereby, the head of the screw 38 fits into the enlarged-diameter portion 46a of the through-hole 46 and does not protrude from the side surface 40a of the engaging member 40.

[0049] (Arrangement of the wire 36) In the present embodiment, as shown in FIG. 6, the wire 36 is provided in the winding direction of the winding roll 20 (the vertical direction in FIG. 6) along a plurality of engaging elements 40 with respect to the inside of the folded-back portion 35 (that is, the hollow portion 32a). Further, the wire 36 extends to the winding roll 20 side (the upper side in FIG. 6) rather than the engaging element 40 (hereinafter referred to as "roll-side engaging element 401") disposed on the winding roll 20 side (the upper side in FIG. 6) among the plurality of engaging elements 40 in the sheet curtain 32. Note that the end portion of the wire 36 on the winding roll 20 side does not reach the winding roll 20. That is, the end portion of the wire 36 on the winding roll 20 side is disposed between the roll-side engaging element 401 and the winding roll 20. The length by which the wire 36 extends from the roll-side engaging element 401 to the winding roll 20 side is, for example, set to be a length equal to or greater than one round of the outer circumference of the winding roll 20. Thereby, when the roll-side engaging element 401 starts to be wound around the winding roll 20, the wire 36 can be wound around the winding roll 20 one round.

[0050] Note that, as an example of the reinforcing material, it is not limited to the wire 36, and it may be formed of a resin material, and various materials and shapes can be used as the material and shape thereof.

[0051] (Overhanging portion 90) As shown in FIGS. 6 and 7, the overhanging portion 90 is provided in the winding direction of the winding roll 20 along a plurality of engaging elements 40 with respect to the surface facing the radially outer side (hereinafter referred to as the outer surface 32X) in the winding state of the sheet curtain 32 by the winding roll 20. This overhanging portion 90 protrudes from the outer surface 32X in the thickness direction of the sheet curtain 32 more than the plurality of engaging elements 40. Further, the overhanging portion 90 extends to the winding roll 20 side (the upper side in FIGS. 6 and 7) rather than the roll-side engaging element 401. Note that the end portion of the overhanging portion 90 on the winding roll 20 side does not reach the winding roll 20. That is, the end portion of the overhanging portion 90 on the winding roll 20 side is disposed between the roll-side engaging element 401 and the winding roll 20.

[0052] In the present embodiment, the overhanging portion 90 is disposed at both side end portions of the sheet curtain 32 so as to be close to each of a plurality of engaging members 40 on both sides.

[0053] The overhanging portion 90 is formed with a constant thickness along the vertical direction at the portion where the engaging member 40 is disposed. Further, the end portion of the overhanging portion 90 on the winding roll 20 side is formed on a taper whose thickness is gradually reduced toward the winding roll 20 side (the upper side in FIGS. 6 and 7). In FIG. 7, a part (specifically, five) of the plurality of engaging members 40 is shown by a solid line, and the other part is shown in a simplified manner by a two-dot chain line.

[0054] The overhanging portion 90 can be configured by a rubber member as an example. When the overhanging portion 90 is configured by a rubber member, as an example, the overhanging portion 90 can be attached to the sheet curtain 32 by welding. Note that, as the overhanging portion 90, a resin material other than rubber or a metal material may be used, and various materials can be used as the material of the overhanging portion 90. Further, the attachment means for attaching the overhanging portion 90 to the sheet curtain 32 is not limited to welding, and may be adhesion by an adhesive or the like, and various means can be used as the attachment means.

[0055] (Drive roll 60 and gear member 64) As shown in FIG. 2, the drive roll 60 is disposed along the shutter width direction on the rear side inside the shutter case 18 and above a pair of guide rails 14. Further, the drive roll 60 is rotatably supported with respect to a support portion (not shown) such as a side plate disposed inside the shutter case 18 with the shutter width direction as the axial direction. A part of the sheet curtain 32 is wound around the drive roll 60 and is curved along the circumferential direction of the drive roll 60. Note that the drive roll 60 may be supported by the support portion that supports the winding roll 20, or may be supported by another support portion.

[0056] As shown in FIG. 2, a pair of gear members 64 are disposed at one axial end side and the other axial end side of the drive roll 60, respectively. The gear member 64 is made of, for example, metal. As shown in FIGS. 3 and 4, a plurality of engaging recesses 66 with which the engaging portions 54 of the engaging members 40 engage are formed side by side in the circumferential direction on the outer periphery of the gear member 64.

[0057] Further, as shown in FIG. 3, a flange 68 protruding radially outward is formed on the outer side of the gear member 64 in the shutter width direction. This flange 68 restricts the movement of the sheet curtain 32 including the engaging member 40 outward in the shutter width direction. Further, the drive roll 60 and the gear member 64 are configured to be capable of normal rotation (K01 direction) and reverse rotation (K02 direction) by a motor (not shown).

[0058] In the present embodiment, the gear member 64 rotates forward and backward in an engaged state with the engaging member 40, and moves the sheet curtain 32 along the circumferential direction of the gear member 64, thereby winding or unwinding the sheet curtain 32 around the winding roll 20 and moving the sheet curtain 32 up and down.

[0059] (Contact block 80) A pair of contact blocks 80 are provided and are respectively disposed on the rear side and the left and right sides inside the shutter case 18 as shown in FIG. 2. Specifically, as shown in FIGS. 3 and 4, the contact blocks 80 are disposed on the opposite side of the gear member 64 with a plurality of engaging members 40 interposed therebetween.

[0060] The contact block 80 is formed in an arc shape using a metal material (in this embodiment, for example, made of zinc die-casting) and is supported by a support portion (not shown) such as a side plate disposed inside the shutter case 18. The contact block 80 has an inner peripheral surface 80a facing the gear member 64 side. Note that the contact block 80 may be supported by a support portion that supports at least one of the winding roll 20 and the drive roll 60, or may be supported by another support portion.

[0061] When the plurality of engaging elements 40 engaged with the engaging recess 66 of the gear member 64 move radially outward of the gear member 64, the inner peripheral surface 80a of the contact block 80 contacts the engaging elements 40 to restrict the movement of the engaging elements 40. Thereby, the meshing state between the engaging recess 66 of the gear member 64 and the engaging elements 40 is maintained.

[0062] (Opening and closing operation of the sheet shutter 10) With the loading port 102 blocked by the curtain unit 30 (specifically, the sheet curtain 32), when the drive roll 60 and the gear member 64 rotate in the forward direction (the K01 direction shown in FIG. 4) by a motor (not shown), the rotating gear member 64 sequentially engages the engaging elements 40 approaching from the tangential direction (F01 in the figure) with the engaging recesses 66. Further, the rotating gear member 64 sequentially disengages the engaging elements 40 engaged with the engaging recesses 66, and the disengaged engaging elements 40 move away in the tangential direction (F02 in the figure).

[0063] Thereby, the sheet curtain 32 moves upward while being guided by the pair of guide rails 14 to open the loading port 102. At this time, the winding roll 20 biased in the winding direction by a biasing member (not shown) winds up the sheet curtain 32.

[0064] With the loading port 102 opened by the sheet curtain 32, when the drive roll 60 and the gear member 64 rotate in the reverse direction (the K02 direction shown in FIG. 4) by a motor (not shown), the rotating gear member 64 sequentially engages the engaging elements 40 approaching from the tangential direction (F11 in the figure) with the engaging recesses 66. Further, the rotating gear member 64 sequentially disengages the engaging elements 40 engaged with the engaging recesses 66, and the disengaged engaging elements 40 move away in the tangential direction (F12 in the figure).

[0065] Thereby, the sheet curtain 32 moves downward while being guided by the pair of guide rails 14 to close the loading port 102. At this time, the sheet curtain 32 is unwound from the winding roll 20 against the biasing force acting on the winding roll 20 by a biasing member (not shown).

[0066] (Operational effects of this embodiment) Next, the operational effects of this embodiment will be described.

[0067] In this embodiment, as shown in FIG. 6, inside the folded-back portion 35 where both side end portions of the sheet curtain 32 are folded back, a wire 36 provided along a plurality of engaging elements 40 in the winding direction by the winding roll 20 extends to the side of the winding roll 20 (the upper side in FIG. 6) rather than the roll-side engaging element 401.

[0068] Here, in a configuration where the end portion of the wire 36 on the side of the winding roll 20 (the upper end portion in FIG. 6) is arranged at the same position as the roll-side engaging element 401 (hereinafter referred to as Configuration A), the following phenomenon may occur.

[0069] That is, in Configuration A, when the sheet curtain 32 is wound around the winding roll 20 a plurality of times, as shown in FIG. 8, the plurality of engaging elements 40 are arranged overlapping in the radial direction of the winding roll 20. And when the sheet curtain 32 is wound around the winding roll 20 a plurality of times, the roll-side engaging element 401 may project outward in the radial direction of the winding roll 20 (see arrow FA in FIG. 8) and push up the engaging element 402 of the sheet curtain 32 wound in the second round outward in the radial direction of the winding roll 20. In this way, when the engaging element 402 is pushed up outward in the radial direction of the winding roll 20, a load is applied to the engaging element 40 and the sheet curtain 32, and the engaging element 40 and the sheet curtain 32 may be damaged. In FIG. 8, a part (specifically, four) of the plurality of engaging elements 40 is shown by a solid line, and the other part is shown in a simplified manner by a two-dot chain line.

[0070] On the other hand, in this embodiment, since the wire 36 extends to the side of the winding roll 20 (the upper side in FIG. 6) rather than the roll-side engaging element 401 as shown in FIG. 6, when the sheet curtain 32 is wound around the winding roll 20 a plurality of times, the wire 36 is wound by the winding roll 20 earlier than the roll-side engaging element 401.

[0071] As a result, a plurality of engaging elements 40 including the roll-side engaging element 401 are wound around the winding roll 20 following the wire 36, and it becomes difficult for the roll-side engaging element 401 to project outward in the radial direction of the winding roll 20.

[0072] For this reason, it is suppressed that the roll-side engaging element 401 pushes up the engaging element 402 of the sheet curtain 32 wound in the second round outward in the radial direction of the winding roll 20. As a result, damage to the engaging element 40 and the sheet curtain 32 is suppressed.

[0073] Further, in the present embodiment, as shown in FIGS. 6 and 7, a plurality of projecting portions 90 are provided along the plurality of engaging elements 40 in the winding direction by the winding roll 20 with respect to the outer surface 32X of the sheet curtain 32, and the projecting portions 90 project more than the plurality of engaging elements 40 in the thickness direction of the sheet curtain 32 from the outer surface 32X are extended to the side of the winding roll 20 (the upper side in FIG. 6) rather than the roll-side engaging element 401.

[0074] For this reason, when the sheet curtain 32 is wound around the winding roll 20 a plurality of times, the projecting portion 90 is wound by the winding roll 20 earlier than the roll-side engaging element 401.

[0075] And, since the projecting portion 90 projects more than the plurality of engaging elements 40 in the thickness direction of the sheet curtain 32 from the outer surface 32X, when the inner surface 32Y on the side opposite to the outer surface 32X of the sheet curtain 32 wound in the second round approaches the sheet curtain 32 wound in the first round, the projecting portion 90 contacts the inner surface 32Y and the approach is restricted.

[0076] For this reason, the engaging element 402 of the sheet curtain 32 wound in the second round moves away from the roll-side engaging element 401, so that it is suppressed that the roll-side engaging element 401 pushes up the engaging element 402 of the sheet curtain 32 wound in the second round outward in the radial direction of the winding roll 20. As a result, damage to the engaging element 40 and the sheet curtain 32 is suppressed.

[0077] (Modification example) Also, in the above embodiment, although not particularly described, the pair of gear members 64 may be integrally formed as one gear member extending in the shutter width direction.

[0078] Also, in the above embodiment, although not particularly described, for the switching between the operation and non-operation of the motor that generates the driving force transmitted to the driving roll 60, a remote controller or the like may be used.

[0079] The present invention is not limited to the above embodiment, and various modifications, changes, and improvements are possible without departing from the gist thereof. For example, a plurality of the above-described modification examples may be combined as appropriate.

Explanation of Reference Numerals

[0080] 10 Sheet shutter 20 Take-up roll 30 Curtain unit 32 Sheet curtain 32X Outer surface 35 Folding portion 36 Wire (an example of a reinforcing material) 40 Engager 64 Gear member 90 Overhanging portion

Claims

1. A sheet curtain wound around a take-up roll, a plurality of engaging elements attached along the winding direction of the take-up roll to folded-back portions where both side end portions of the sheet curtain are folded back, and to which a driving force for moving the sheet curtain up and down by engaging with a gear member is transmitted, a reinforcing member provided in the folded-back portion along the plurality of engaging elements in the winding direction, and extending further toward the take-up roll side than the engaging element disposed closest to the take-up roll side in the sheet curtain among the plurality of engaging elements, A curtain unit comprising:

2. Provided along the plurality of engaging elements in the winding direction with respect to a surface facing radially outward in the wound state of the sheet curtain by the take-up roll, protruding from the surface in the thickness direction of the sheet curtain more than the plurality of engaging elements, and extending further toward the take-up roll side than the engaging element disposed closest to the take-up roll side in the sheet curtain among the plurality of engaging elements, an overhanging portion The curtain unit according to claim 1, comprising:

3. The curtain unit according to claim 1 or 2, a gear member that engages with the engaging element and moves the sheet curtain up and down by forward and reverse rotation, A sheet shutter comprising:

Images