Holder

Abstract

To provide a holder suitable for a sheet winding device that rotatably supports a winding shaft to allow winding and unwinding of a sheet and prevents deterioration of the sheet.SOLUTION: Means for solving the above problem is a holder 5 supporting a winding shaft 3 capable of winding and unwinding a sheet 2 of a sheet winding device 1 capable of storing and unfolding the sheet 2, comprising: a tubular portion 50 having an opening 50a that allows the sheet 2 to enter and exit; a first roller 52 rotatably provided at one opening side end of the tubular portion 50; a second roller 53 rotatably provided at a position adjacent to the first roller 52 in the tubular portion 50 on the opposite side of the opening side in a circumferential direction of the tubular portion 50 and capable of supporting the winding shaft 3 from below together with the first roller 52; and a third roller 54 rotatably provided at the other opening side end of the tubular portion 50.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This invention relates to a holder.

Background Art

[0002] In simple structures such as greenhouses, greenhouses, and simple warehouses, there may be provided a ventilation device that opens and closes an opening and closing sheet that covers an opening provided in the simple structure to perform ventilation, or a light shielding device that unfolds and stores a light shielding sheet that covers a framework from the inside or outside of the simple structure to adjust the amount of sunlight pouring onto plants cultivated in the simple structure. Such a sheet winding device may be provided.

[0003] As such a sheet winding device, for example, there is one that includes a winding shaft that is attached to the lower end of an opening and closing sheet or a light shielding sheet (hereinafter referred to as a "sheet") and rolls on an arch-shaped framework that constitutes a simple structure to wind and pay out the sheet, and a driving device that is provided at one end of the winding shaft to rotationally drive the winding shaft (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a conventional sheet winding device, when the sheet is being wound, since the winding shaft moves toward the top side of the simple structure while rotating, the driving device provided at one end of the winding shaft also moves toward the top side of the simple structure together with the winding shaft. Therefore, in a conventional sheet winding device, the driving device cannot be fixed to the simple structure.

[0006] Then, due to the weight of the drive device provided at one end of the take-up shaft, only the drive device side of the sheet is pulled downward, so the take-up shaft is in a tilted state where one end side is positioned lower than the other end side.

[0007] In this state, when the sheet is wound around the take-up shaft, the take-up shaft meanders and cannot wind the sheet evenly at one end side and the other end side of the take-up shaft. Therefore, when the sheet is stored, a part of the sheet cannot be wound around the take-up shaft.

[0008] Particularly when the sheet covers the roof surface of a simple structure, when the sheet is stored, in addition to the rolled part of the sheet wound around the take-up shaft, a shadow is formed in the simple structure by a part of the sheet that was not wound around the take-up shaft.

[0009] The above problem can be solved by rotating and driving the take-up shaft in place without moving it relative to the simple structure to enable winding and unwinding of the sheet. However, simply supporting the take-up shaft rotatably and attaching it to the simple structure cannot wind and unwind the sheet by the rotation of the take-up shaft, and also cannot prevent deterioration of the sheet during winding and unwinding of the sheet.

[0010] Therefore, an object of the present invention is to provide a holder suitable for a sheet take-up device that rotatably supports a take-up shaft to allow winding and unwinding of a sheet and prevent deterioration of the sheet.

Means for Solving the Problems

[0011] The holder of the present invention for achieving the above object is a holder that supports a take-up shaft in a sheet take-up device that has a take-up shaft capable of winding and unwinding a sheet and stores and unfolds the sheet, and allows the sheet to enter and exit a plurality of rollers provided on a cylindrical portion having a size that does not allow the winding shaft to pass through, and the plurality of rollers are a cylindrical portion having an opening, provided on a cylindrical portion having a size that does not allow the winding shaft to pass through, and the plurality of rollers are a first roller rotatably provided at one opening side end in the circumferential direction of the cylindrical portion, and rotatably provided at a position adjacent to the first roller in the anti-opening side in the circumferential direction of the cylindrical portion with respect to the first roller, and together with the first roller, the take-up shaftonly with the roll-shaped sheet wound around the winding shaft, and the first roller and the third roller protrude toward the opening side A second roller that can be supported from below and a third roller rotatably provided at the other opening side end in the circumferential direction of the cylindrical portion only with the roll-shaped sheet wound around the winding shaft, and the first roller and the third roller protrude toward the opening side It is characterized by this. According to this configuration, when the winding shaft is rotationally driven in a state where the winding shaft is supported between the first roller and the second roller, the first roller and the second roller rotate in accordance with the rotation of the winding shaft. Then, when the sheet is wound and fed out, since the first roller and the second roller roll, the winding and feeding out of the sheet can be performed smoothly, and the sheet can be wound and fed out without receiving resistance from the holder. In addition, since the first roller is provided at one opening side end of the cylindrical portion, when the sheet enters and exits the cylindrical portion, the first roller provided on the cylindrical portion rotates, so the sheet is less likely to receive resistance from the holder and the deterioration of the sheet can be prevented. Furthermore, since the third roller is provided at the other opening side end of the cylindrical portion, when the sheet enters and exits the cylindrical portion, even if the sheet contacts the third roller, the third roller rotates, so the sheet is less likely to receive resistance from the holder and the deterioration of the sheet can be prevented.

Effect of the Invention

[0012] According to the holder of the present invention, the winding shaft can be rotatably supported to allow the winding and feeding out of the sheet, and the deterioration of the sheet can be prevented.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0014] Hereinafter, the present embodiment will be described with reference to the drawings. The same reference numerals attached through several drawings indicate the same parts.

[0015] In the present embodiment, as shown in FIGS. 1 and 2, the simple structure includes a framework F having a plurality of arch-shaped aggregates P arranged side by side along the depth direction and a ridge member R connected to the inside of the top of the aggregate P and extending along the depth direction, and a covering sheet S extended outside the framework F, and is configured as a vinyl house H having an arch shape.

[0016] The ridge member R is a cylindrical pipe material that is connected to the inside of the top of the aggregate P, extends along the depth direction of the vinyl house H, and is arranged horizontally with respect to the ground.

[0017] Further, as shown in FIGS. 1 and 2, the vinyl house H is provided with a sheet winding device 1 capable of storing and deploying a light-shielding sheet 2 as a sheet provided inside the framework F.

[0018] Next, each part of the vinyl house H of the present embodiment will be described in detail. As shown in FIGS. 1 and 2, the aggregate P has a pair of left and right standing portions Pa, Pa that stand linearly from the ground when viewed from the front, and a substantially arc-shaped arch portion Pb that connects the upper ends of the respective standing portions Pa, Pa, and is configured in an arch shape. In addition, the lower ends of the plurality of aggregates P are buried in the ground and arranged in alignment along the depth direction. However, the aggregate P may be configured in a mountain shape in which the arch portion Pb is inclined obliquely inward from the upper ends of the respective standing portions and the upper ends are connected to each other.

[0019] Also, although not shown in the drawings, a plurality of sheet fixing frames are attached to the outer periphery of each aggregate P, spanning between the side portions of the standing portions Pa of each aggregate P and between the arch portions Pb. The sheet fixing frame is provided with a groove. When an elastic member is inserted into the groove of the sheet fixing frame with the covering sheet S inserted into the groove of the sheet fixing frame, the covering sheet S is fixed to the sheet fixing frame. In this way, by fixing the covering sheet S covering the framework F to each sheet fixing frame, the covering sheet S is extended over the entire outside of the framework F.

[0020] Also, in FIGS. 1 and 2, in order to make the structure of the sheet winding device 1 described later easier to understand, the structure of the gable surface of the greenhouse H is omitted. However, actually, on the gable surface of the greenhouse H, there are provided an opening that serves as an entrance / exit in the greenhouse H, a covering sheet that covers the portions other than the opening on the gable surface of the greenhouse H, and a door that opens and closes the opening.

[0021] Note that, as the covering sheet S of the present embodiment, a soft sheet such as a polyolefin-based film such as a vinyl chloride film or a PET film is used, but a hard sheet such as a polyester film or a fluorine film may also be used.

[0022] Also, in the present embodiment, a single-span type greenhouse H installed independently is described, but the greenhouse H may be a multi-span type in which a plurality of spans are arranged side by side in the width direction.

[0023] Next, the sheet winding device 1 of the present embodiment will be described in detail. As shown in FIGS. 1 and 2, the sheet winding device 1 is a device that winds and unwinds a light-shielding sheet 2 that is provided inside the framework F and can be deployed from the top of the framework F to one side portion on the right side in FIG. 2. Specifically, the sheet winding device 1 is disposed inside the framework F so as to cross the frame member P, is rotatably supported about an axis with respect to the framework F, and is attached to the upper end of the light-shielding sheet 2 so that the light-shielding sheet 2 can be wound and unwound. It includes a winding shaft 3, a drive device M provided at one end of the winding shaft 3 for rotationally driving the winding shaft 3, and a guide member 4 as a guide portion for guiding the movement of the lower end of the light-shielding sheet 2 when the light-shielding sheet 2 is wound and unwound.

[0024] As shown in FIGS. 1 and 3, the winding shaft 3 of the present embodiment is a pipe material extending along the depth direction of the greenhouse H, and is rotatably supported about an axis with respect to the ridge member R of the framework F via a holder 5 described later. Further, the winding shaft 3 is connected to the upper end of the light-shielding sheet 2. By rotationally driving the drive device M provided at one end of the winding shaft 3, the light-shielding sheet 2 can be wound around the winding shaft 3.

[0025] Although not described in detail, the drive device M of the present embodiment is a motor that is fixedly supported with respect to the ridge member R by a hanging tool (not shown) provided at one end of the ridge member R. However, the installation means of the drive device M on the greenhouse H is not particularly limited. For example, a gantry may be installed in the greenhouse H and the drive device M may be supported at the upper end of the gantry. Further, the configuration of the drive device M is not particularly limited as long as it can rotationally drive the winding shaft 3. For example, the drive device M may be composed of a motor installed on the ground and a transmission mechanism that connects the output shaft of the motor and one end of the winding shaft 3 and transmits the rotation of the output shaft of the motor.

[0026] Further, although details will be described later, the guide members 4 of the present embodiment are plural, and as shown in FIG. 2, they are pipes that are spanned from the lower right end of the arch portion Pb in each aggregate P to the vicinity of the upper left end from the top of the arch portion Pb and installed with a right downward slope, and support a weight 6 (to be described later) connected to the lower end of the light-shielding sheet 2 from below.

[0027] According to the sheet winding device 1 configured as described above, as shown in FIG. 2, when the winding shaft 3 is rotationally driven in the forward direction by the drive device M in a state where the light-shielding sheet 2 is deployed from the top to one side portion on the right side in the figure inside the framework F, the lower end of the light-shielding sheet 2 is wound around the winding shaft 3 while being guided by the guide member 4. Then, when the light-shielding sheet 2 is wound around the winding shaft 3 up to the vicinity of the lower end, the light-shielding sheet 2 is in a stored state.

[0028] Conversely, when the winding shaft 3 is rotationally driven in the reverse direction by the drive device M from the state where the light-shielding sheet 2 is stored in the winding shaft 3, the light-shielding sheet 2 is fed out from the winding shaft 3, and the lower end of the light-shielding sheet 2 gradually approaches the side portion of the framework F while being guided by the guide member 4. Then, when the light-shielding sheet 2 is fed out from the winding shaft 3 until the lower end of the light-shielding sheet 2 moves to the vicinity of one side portion of the framework F, the light-shielding sheet 2 is in a deployed state. In this way, when the light-shielding sheet 2 is deployed, it covers one side of the roof surface of the greenhouse H from the inside, so that sunlight is blocked.

[0029] Therefore, the sheet winding device 1 of the present embodiment can adjust the amount of sunlight pouring on the plants cultivated in the greenhouse H by driving the winding shaft 3 by the drive device M to deploy or store the light-shielding sheet 2.

[0030] In addition, in such a sheet winding device 1, a winding shaft 3 provided with a driving device M at one end is attached to the upper end of the light-shielding sheet 2. Therefore, the load of the driving device M does not act on the lower end of the light-shielding sheet 2. Thus, unlike a conventional sheet winding device, when a driving device is attached to one end of a winding shaft attached to the lower end of a sheet, a situation where the load concentrates on one side of the lower end of the sheet and the sheet cannot be wound uniformly around the winding shaft does not occur, and only a part of the light-shielding sheet 2 is not pulled. Therefore, the light-shielding sheet 2 can be wound uniformly on one end side and the other end side of the winding shaft 3. Therefore, when the light-shielding sheet 2 is stored, all of the light-shielding sheet 2 can be wound around the winding shaft 3.

[0031] Note that the light-shielding sheet 2 has flexibility such that it can be wound around the winding shaft 3, and its material and structure are not particularly limited as long as it can reduce the amount of sunlight passing through. For example, the light-shielding sheet 2 may be formed of a material with a high light-shielding rate or may be formed in a mesh shape.

[0032] Next, each part of the sheet winding device 1 will be described in detail. As shown in FIGS. 1 and 3, the winding shaft 3 of the present embodiment is a pipe material extending along the depth direction of the greenhouse H, and is rotatably supported about an axis via a plurality of holders 5 that are connected to the ridge member R of the framework F at a predetermined interval along the depth direction of the greenhouse H.

[0033] Specifically, as shown in FIGS. 3 and 4, each holder 5 includes a cylindrical tube portion 50 having an opening 50a at a position (diagonally downward to the right in FIG. 3) that allows the light-shielding sheet 2 to enter and exit and faces the lower end side of the light-shielding sheet 2 in the deployed state, and a mounting piece 51 that stands vertically from the upper end of the tube portion 50 and can be connected to the ridge member R via a mounting bracket J. The winding shaft 3 is accommodated in the tube portion 50.

[0034] Here, when the winding shaft 3 is arranged horizontally with respect to the ground, the light-shielding sheet 2 can be wound uniformly in the axial direction with respect to the winding shaft 3 when the light-shielding sheet 2 is wound. Therefore, the winding shaft 3 is preferably arranged horizontally with respect to the ground.

[0035] The holders 5 are connected to the inside of the top of the aggregate P, and a plurality of them are installed at a predetermined interval with respect to the ridge member R that extends along the depth direction of the greenhouse H and is installed horizontally with respect to the ground. Therefore, the line passing through the center of the cylindrical portion 50 of each holder 5 is parallel to the axial direction of the ridge member R, that is, horizontal with respect to the ground.

[0036] Therefore, as shown in FIG. 3, when the winding shaft 3 is accommodated in the cylindrical portion 50 of each holder 5 connected to the ridge member R, the winding shaft 3 is arranged horizontally with respect to the ground. Thus, in the present embodiment, when installing the sheet winding device 1 in the greenhouse H, by using the existing ridge member R arranged horizontally with respect to the ground, it becomes easy to arrange the winding shaft 3 horizontally with respect to the ground. Note that the shape of the ridge member R is not limited to a cylindrical shape, and for example, it may be a square cylindrical shape.

[0037] Also, although not described in detail, as shown in FIG. 4, the mounting piece 51 is a plate member that stands vertically from the flat surface portion 50b, which is a flat surface provided on the upper part of the cylindrical portion 50, and has a hole 51a. Then, as shown in FIG. 3, a bolt B is inserted through a hole (not shown) provided in the mounting fitting J suspended from the ridge member R and the hole 51a of the mounting piece 51, and a wing nut N is screwed onto the threaded portion of the bolt B, whereby the holder 5 is connected to the ridge member R. However, the configurations of the mounting piece 51 and the mounting fitting J described above are merely examples, and the configurations of the mounting piece 51 and the mounting fitting J are not particularly limited as long as the holder 5 can be connected to the ridge member R.

[0038] Further, in the present embodiment, since the opening 50a that allows the light-shielding sheet 2 to enter and exit is provided at a position facing the lower end side of the light-shielding sheet 2 in the deployed state in the cylindrical portion 50 (diagonally downward to the right in FIG. 4), the light-shielding sheet 2 smoothly enters the cylindrical portion 50 during winding. However, the position of the opening 50a in the cylindrical portion 50 does not have to be a position facing the lower end side of the light-shielding sheet 2 in the deployed state in the cylindrical portion 50. For example, the opening 50a may be provided downward in the vertical direction of the cylindrical portion 50.

[0039] In addition, the opening width of the opening 50a of the cylindrical portion 50 is narrower than the diameter of the winding shaft 3. Therefore, the winding shaft 3 does not fall out of the cylindrical portion 50. However, the opening width of the opening 50a of the cylindrical portion 50 may be equal to or greater than the diameter of the winding shaft 3.

[0040] Also, the inner diameter of the cylindrical portion 50 only needs to be set to be equal to or greater than the diameter of the roll-shaped light-shielding sheet 2 wound around the winding shaft 3 when the light-shielding sheet 2 is stored. In addition, in the present embodiment, the cylindrical portion 50 is formed in a cylindrical shape, but the cross-sectional shape of the cylindrical portion 50 is not particularly limited, and for example, it may be a rectangular cylindrical shape.

[0041] As shown in FIGS. 3 and 4, the holder 5 includes a first roller 52 rotatably provided at one opening side end located on the left side in FIG. 3 across the opening 50a in the cylindrical portion 50, a second roller 53 provided at a position adjacent to the first roller 52 in the circumferential direction of the cylindrical portion 50 on the anti-opening side (left side in FIG. 3), and a third roller 54 rotatably provided at the other opening side end located on the right side in FIG. 3 of the cylindrical portion 50.

[0042] As shown in FIG. 3, the winding shaft 3 is accommodated in the cylindrical portion 50 and is rotatably supported from below around the axis between the first roller 52 and the second roller 53.

[0043] In this state, when the take-up shaft 3 is rotationally driven, since the directions of the rotation axes of the first roller 52 and the second roller 53 are the same as that of the take-up shaft 3, the first roller 52 and the second roller 53 rotate in accordance with the rotation of the take-up shaft 3. Then, when the light-shielding sheet 2 is being wound up and paid out, since the first roller 52 and the second roller 53 roll, the winding up and paying out of the light-shielding sheet 2 can be performed smoothly, and the light-shielding sheet 2 can be wound up and paid out without receiving resistance from the holder 5. Further, since the first roller 52 is provided at one opening side end which is on the left side in FIG. 3 of the cylindrical portion 50, when the light-shielding sheet 2 enters and exits the cylindrical portion 50, the first roller 52 provided on the cylindrical portion 50 rotates, so that the light-shielding sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light-shielding sheet 2 can be prevented. Therefore, when the first roller 52 and the second roller 53 are provided on the cylindrical portion 50, deterioration of the light-shielding sheet 2 is suppressed.

[0044] Also, on the other opening side end which is on the right side in FIG. 3 of the cylindrical portion 50, a third roller 54 whose direction of the rotation axis is the same as that of the take-up shaft 3 is provided. Then, when the light-shielding sheet 2 enters and exits the cylindrical portion 50, even if the light-shielding sheet 2 contacts the third roller 54, since the third roller 54 rotates, the light-shielding sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light-shielding sheet 2 can be prevented. However, the third roller 54 may be omitted.

[0045] Note that the number and positions of the rollers provided on the cylindrical portion 50 can be changed as appropriate. For example, as shown in FIG. 5, the holder 5A may have a first roller 52A rotatably provided at one opening side end of the cylindrical portion 50 and a second roller 53A provided at the other opening side end of the cylindrical portion 50, and the take-up shaft 3 may be rotatably supported from below around the axis between the first roller 52A and the second roller 53A.

[0046] According to the holder 5A configured as described above, similar to the holder 5 shown in FIG. 3, when the winding shaft 3 is rotationally driven, the first roller 52A and the second roller 53A rotate in accordance with the rotation of the winding shaft 3. Therefore, when the light-shielding sheet 2 is wound and fed out, the winding and feeding out of the light-shielding sheet 2 can be performed smoothly, and the light-shielding sheet 2 can be wound and fed out without receiving resistance from the holder 5. Further, since the first roller 52A and the second roller 53A are respectively provided at each opening side end of the cylindrical portion 50, when the light-shielding sheet 2 enters and exits the cylindrical portion 50, the first roller 52A and the second roller 53A rotate, so that the light-shielding sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light-shielding sheet 2 can be prevented.

[0047] Therefore, according to the holder 5A shown in FIG. 5, since the second roller 53A has the functions of the second roller 53 and the third roller 54 in the holder 5 shown in FIG. 3, while exhibiting the same effect as the holder 5, the number of rollers can be reduced. However, the holders 5 and 5A do not necessarily have to be provided with rollers.

[0048] Next, the guide member 4 of the present embodiment will be described in detail. In the present embodiment, there are a plurality of guide members 4, and as shown in FIG. 1, they are respectively provided for each aggregate P. Specifically, as shown in FIG. 2, the guide member 4 is a pipe that is spanned from the lower end on the right side of the top of the arch portion Pb in the aggregate P to the vicinity of the upper end on the left side of the top of the arch portion Pb and is installed with a downward slope on the right shoulder, and is inclined along the slope of the roof surface from the top of the greenhouse H to one side portion on the right side in FIG. 2.

[0049] In this way, the guide member 4 of the present embodiment is arranged at intervals vertically below one side of the roof surface from the top of the greenhouse H to one side portion, and is installed with respect to the aggregate P so as to be substantially parallel to the slope of the roof surface and is arranged below the light-shielding sheet 2.

[0050] Therefore, when the light-shielding sheet 2 is deployed, as shown in FIG. 2, the light-shielding sheet 2 is supported from below by a plurality of guide members 4 provided on each aggregate P. Therefore, when the light-shielding sheet 2 is wound up, the lower end of the light-shielding sheet 2 abuts against the guide member 4 and moves toward the winding shaft 3 while being guided by the guide member 4. Also, when the light-shielding sheet 2 is unwound, the lower end of the light-shielding sheet 2 abuts against the guide member 4 and moves toward the side portion of the vinyl house H, which is the side of the anti-winding shaft, while being guided by the guide member 4.

[0051] In addition, in the present embodiment, each end portion of the guide member 4 is connected to the aggregate P via a bracket (not shown), but the connection method of the guide member 4 to the aggregate P is not particularly limited. Also, the mounting angle of the guide member 4 with respect to the aggregate P can be changed as appropriate and does not have to be parallel to the inclination of the roof surface of the vinyl house H.

[0052] Also, as shown in FIG. 6, a rod-shaped weight 6 is connected to the lower end of the light-shielding sheet 2 via a sheet stopper 7 described later. When the light-shielding sheet 2 is wound up and unwound, the weight 6 allows the lower end of the light-shielding sheet 2 to move up and down along the guide member 4 without fluttering, so that the light-shielding sheet 2 is prevented from curling up. Also, since the light-shielding sheet 2 is pulled downward by the weight of the weight 6, tension is applied to the light-shielding sheet 2, suppressing the deflection of the light-shielding sheet 2.

[0053] Specifically, the weight 6 is a pipe material arranged parallel to the winding shaft 3, and the axial length is set to be equal to or greater than the length in the width direction (hereinafter simply referred to as the "width direction") along the axial direction of the winding shaft 3 of the light-shielding sheet 2. Also, the weight 6 is attached to the lower end of the light-shielding sheet 2 with the center in the width direction of the light-shielding sheet 2 and the center in the axial direction of the weight 6 aligned. Then, since the load of the weight 6 is evenly applied to the light-shielding sheet 2, the upper and lower positions of the lower end of the light-shielding sheet 2 are the same in the width direction. Therefore, when the light-shielding sheet 2 is wound up, the light-shielding sheet 2 can be wound uniformly in the axial direction with respect to the winding shaft 3.

[0054] Note that, as long as the weight 6 is rod-shaped with a constant cross-sectional shape in the axial direction, its diameter, material, and shape are not particularly limited. For example, the weight 6 may be solid. However, if the weight of the weight 6 is too heavy, the force pulling the light-shielding sheet 2 downward will increase, which may cause deterioration of the light-shielding sheet 2 or require an increase in the output of the drive device M that rotationally drives the winding shaft 3. Therefore, the weight 6 only needs to have a weight that can apply a tension to the light-shielding sheet 2 to the extent that it can prevent the light-shielding sheet 2 from curling up and suppress the deflection of the light-shielding sheet 2.

[0055] Also, if the load of the weight 6 does not have to be evenly applied to the light-shielding sheet 2, the weight 6 does not have to be rod-shaped. For example, a plurality of weights may be connected to the lower end of the light-shielding sheet 2 at intervals in the width direction. Further, if the self-weight of the light-shielding sheet 2 can sufficiently prevent the light-shielding sheet 2 from curling up or deflecting, the weight 6 may be omitted.

[0056] In this embodiment, the weight 6 is connected to the lower end of the light-shielding sheet 2 by a plurality of sheet stoppers 7 arranged at predetermined intervals along the axial direction. As shown in FIG. 6, the sheet stopper 7 has an opening 7a that is narrower in width than the diameter of the weight 6 and is C-shaped cylindrical with an inner diameter substantially equal to the diameter of the weight 6, and has elasticity.

[0057] Then, with the lower end of the light-shielding sheet 2 wound around the outer periphery of the weight 6, the weight 6 is fitted into the inside of the sheet stopper 7 through the opening 7a while expanding the opening 7a of the sheet stopper 7, so that the light-shielding sheet 2 is sandwiched between the outer periphery of the weight 6 and the inner periphery of the sheet stopper 7, and the weight 6 is connected to the lower end of the light-shielding sheet 2.

[0058] Also, as shown in FIG. 3, the sheet stopper 7 is provided in an attachment orientation in which the opening 7a faces upward (opposite to the guide member side) with respect to the portion of the weight 6 that faces the guide member 4 vertically, and the weight 6 abuts against the guide member 4 via the sheet stopper 7. Further, during winding and feeding out of the light-shielding sheet 2, the weight 6 moves so as to be dragged on the guide member 4 and does not roll, so that the weight 6 always abuts against the guide member 4 via the sheet stopper 7.

[0059] Therefore, even if the lower end of the light-shielding sheet 2 is pressed against the guide member 4 by the weight of the weight 6, the light-shielding sheet 2 does not directly contact the guide member 4. Thus, it is possible to prevent the light-shielding sheet 2 from rubbing against the guide member 4 and deteriorating when the light-shielding sheet 2 is wound up and paid out. Note that the mounting orientation of the sheet fixing member 7 with respect to the weight 6 may be any orientation as long as the opening 7a does not face the guide member 4.

[0060] Note that the number of the sheet fixing members 7 may be appropriately determined according to the required mounting strength of the weight 6. However, if the sheet fixing members 7 are mounted at at least two positions that are substantially equidistant from the center in the axial direction of the weight 6 and face the guide member 4, it is possible to prevent the weight 6 from tilting.

[0061] Also, the configuration of the sheet fixing member 7 described above is merely an example, and the sheet fixing member 7 is not particularly limited as long as the weight 6 can be connected to the lower end of the light-shielding sheet 2. Regardless of how the sheet fixing member is configured, if the sheet fixing member is disposed between the light-shielding sheet 2 and the guide member 4 to separate the light-shielding sheet 2 from the guide member 4, it is possible to prevent the light-shielding sheet 2 from rubbing against the guide member 4 and deteriorating. However, if it is not necessary to prevent the light-shielding sheet 2 from rubbing against the guide member 4, the sheet fixing member does not have to contact the guide member 4.

[0062] In this embodiment, the light-shielding sheet 2 of the sheet winding device 1 covers only one side of the roof surface of the greenhouse H from the inside when deployed. However, two sheet winding devices 1 may be installed in the greenhouse H so as to cover the left and right sides in FIG. 2 of the roof surface of the greenhouse H from the inside. In that case, the guide member that guides the movement of the lower end of the light-shielding sheet 2 when the light-shielding sheet 2 is wound up and paid out may be, for example, an arch-shaped member disposed inside the arch portion Pb of the aggregate P with a gap from the arch portion Pb.

[0063] As described above, the sheet winding device 1 of the present embodiment is provided in a vinyl house H as a simple structure having a framework F configured by arranging a plurality of arch-shaped or mountain-shaped aggregates P along the depth direction. The sheet winding device 1 can store and deploy a light-shielding sheet 2 as a sheet provided inside the framework F. The sheet winding device 1 includes a winding shaft 3 that is arranged to cross the aggregate P and is attached to the upper end of the light-shielding sheet 2, is rotatably supported about an axis with respect to the framework F, and can wind and pay out the light-shielding sheet 2, a driving device provided at one end of the winding shaft 3 to rotationally drive the winding shaft 3, and a guide member 4 as a guide portion that guides the movement of the lower end of the light-shielding sheet 2 when the light-shielding sheet 2 is wound and paid out.

[0064] According to the sheet winding device 1 configured as described above, since the winding shaft 3 is attached to the upper end of the light-shielding sheet 2 and the load of the driving device does not act on the lower end of the light-shielding sheet 2, the light-shielding sheet 2 can be uniformly wound on one end side and the other end side of the winding shaft 3. Therefore, when the light-shielding sheet 2 is stored, all of the light-shielding sheets 2 can be wound around the winding shaft 3.

[0065] And in the present embodiment, since the light-shielding sheet 2 covers the roof surface of the vinyl house H, when all of the light-shielding sheets 2 can be wound around the winding shaft 3 in this way, the size of the shadow formed in the vinyl house H by the winding shaft 3 and the light-shielding sheet 2 can be minimized when the light-shielding sheet 2 is stored.

[0066] In the present embodiment, the sheet winding device 1 unfolds or stores the light-shielding sheet 2 that covers the roof surface of the vinyl house H from the inside. However, the sheet winding device 1 may unfold or store the light-shielding sheet 2 that covers the outside of the covering sheet S that constitutes the roof surface of the vinyl house H. In that case, the winding shaft 3 may be rotatably installed from the outside at the top of the framework F, and the upper part of each aggregate P may be made to function as a guide portion that guides the movement of the lower end of the light-shielding sheet 2 when the light-shielding sheet 2 is wound and paid out.

[0067] Further, the sheet winding device 1 may be configured to deploy or store a light-shielding sheet 2 that covers the inside or outside of the side portion of the greenhouse H. In that case, a winding shaft 3 is rotatably installed at the shoulder portion, which is the boundary between the standing portion Pa and the arch portion Pb of each aggregate P, or at the upper portion of the standing portion Pa. A plurality of guide pipes are erected near each standing portion Pa, and the light-shielding sheet 2 is disposed between the standing portion Pa and the guide pipes. In that case, the guide pipe serves as a guide portion that guides the movement of the lower end of the light-shielding sheet 2 when the light-shielding sheet 2 is wound and paid out. By providing such a guide pipe, it is possible to prevent the light-shielding sheet 2 covering the side portion of the greenhouse H from approaching or receding from the aggregate P.

[0068] Also, in the present embodiment, the sheet winding device 1 functions as a light-shielding device for deploying or storing the light-shielding sheet 2. However, for example, the sheet deployed or stored by the sheet winding device 1 may be a transparent opening / closing sheet that opens and closes an opening provided in the roof surface or side surface of the greenhouse H.

[0069] Further, the sheet winding device 1 of the present embodiment includes a rod-shaped weight 6 that is connected to the lower end of the light-shielding sheet 2 and is arranged parallel to the winding shaft 3. The axial length of the weight 6 is equal to or greater than the widthwise length along the axial direction of the winding shaft 3 in the light-shielding sheet 2, and the center in the width direction of the light-shielding sheet 2 coincides with the center in the axial direction of the weight 6, and the weight 6 is attached to the light-shielding sheet 2.

[0070] According to the sheet winding device 1 configured as described above, it is possible to prevent the light-shielding sheet 2 from curling up and the light-shielding sheet 2 from bending due to the weight of the weight 6. Further, since the load of the weight 6 is evenly applied to the light-shielding sheet 2, when the light-shielding sheet 2 is wound, the light-shielding sheet 2 can be wound uniformly in the axial direction with respect to the winding shaft 3.

[0071] Further, the sheet winding device 1 of the present embodiment includes a sheet stopper 7 that connects the weight 6 to the lower end of the light-shielding sheet 2, and the weight 6 abuts against the guide member 4 via the sheet stopper 7.

[0072] According to the sheet winding device 1 configured as described above, even if the lower end of the light-shielding sheet 2 is pressed against the guide member 4 by the weight of the weight 6, the light-shielding sheet 2 does not directly contact the guide member 4. Therefore, when the light-shielding sheet 2 is wound and unwound, it is possible to prevent the light-shielding sheet 2 from rubbing against the guide member 4 and deteriorating. However, if the curling up and deflection of the light-shielding sheet 2 are sufficiently prevented by the self-weight of the light-shielding sheet 2, the weight 6 may be omitted.

[0073] Further, the sheet winding device 1 of the present embodiment includes a holder 5 that is connected to the framework F and supports the winding shaft 3 so as to be rotatable about an axis, and has an opening 50a that allows the light-shielding sheet 2 to enter and exit when the light-shielding sheet 2 is wound and unwound. A plurality of holders 5 are provided at predetermined intervals along the depth direction of the greenhouse H.

[0074] According to the sheet winding device 1 configured as described above, by retrofitting the holder 5 to the existing greenhouse H, the winding shaft 3 can be supported by the framework F so as to be rotatable about an axis, so that the installation of the sheet winding device 1 to the existing greenhouse H becomes easy. However, a support portion for supporting the winding shaft 3 rotatably about an axis may be provided in the framework F in advance.

[0075] In the sheet winding device 1 of the present embodiment, each holder 5 is connected to the framework F inside the top of the frame member P and is respectively connected to the ridge member R arranged along the depth direction of the greenhouse H, and has a cylindrical portion 50 for accommodating the winding shaft 3.

[0076] Here, when the winding shaft 3 is arranged horizontally with respect to the ground, when the light-shielding sheet 2 is wound, the light-shielding sheet 2 can be wound uniformly in the axial direction with respect to the winding shaft 3. Therefore, the winding shaft 3 is preferably arranged horizontally with respect to the ground.

[0077] On the other hand, since the ridge member R is connected to the inside of the top of the aggregate P and extends along the depth direction of the greenhouse H, it is installed horizontally with respect to the ground. Therefore, the line passing through the centers of the cylindrical portions 50 of the plurality of holders 5 connected to the ridge member R is parallel to the axial direction of the ridge member R, that is, horizontal with respect to the ground.

[0078] Therefore, according to the sheet winding device 1 configured as described above, the winding shaft 3 accommodated in the cylindrical portion 50 of each holder 5 is arranged horizontally with respect to the ground. Thus, when installing the sheet winding device 1 in the greenhouse H, by using the existing ridge member R arranged horizontally with respect to the ground, it becomes easy to arrange the winding shaft 3 horizontally with respect to the ground. However, the holder 5 may be connected to a portion other than the ridge member R of the framework F.

[0079] Further, in the sheet winding device 1 of the present embodiment, the holder 5 has a cylindrical portion 50 having an opening 50a, a first roller 52 rotatably provided at one opening side end of the cylindrical portion 50, and a second roller 53 rotatably provided at a position adjacent to the first roller 52 in the circumferential direction of the cylindrical portion 50 on the anti-opening side. The winding shaft 3 is accommodated in the cylindrical portion 50 and is rotatably supported from below between the first roller 52 and the second roller 53 around the axis.

[0080] According to the sheet winding device 1 configured as described above, when the winding shaft 3 is rotationally driven, the first roller 52 and the second roller 53 rotate in accordance with the rotation of the winding shaft 3. Then, when the light-shielding sheet 2 is wound and unwound, the first roller 52 and the second roller 53 roll, so that the winding and unwinding of the light-shielding sheet 2 can be performed smoothly, and the light-shielding sheet 2 can be wound and unwound without receiving resistance from the holder 5. Further, since the first roller 52 is provided at one opening side end of the cylindrical portion 50, when the light-shielding sheet 2 enters and exits the cylindrical portion 50, the first roller 52 provided on the cylindrical portion 50 rotates, so that the light-shielding sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light-shielding sheet 2 can be prevented. Therefore, deterioration of the light-shielding sheet 2 is suppressed.

[0081] In addition, in the sheet winding device 1 of the present embodiment, a third roller 54 is rotatably provided at the other opening side end of the cylindrical portion 50. According to the sheet winding device 1 configured in this way, when the light shielding sheet 2 enters and exits the cylindrical portion 50, even if the light shielding sheet 2 comes into contact with the third roller 54, since the third roller 54 rotates, the light shielding sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light shielding sheet 2 can be prevented. However, the third roller 54 may be omitted.

[0082] Also, as shown in FIG. 5, the holder 5A may be configured such that a first roller 52A is provided at one opening side end of the cylindrical portion 50 and a second roller 53A is provided at the other opening side end of the cylindrical portion 50. In this case, since the second roller 53A combines the functions of the second roller 53 and the third roller 54 in the holder 5 shown in FIG. 3, while exhibiting the same effect as the holder 5, the number of rollers can be reduced. However, the holders 5 and 5A do not necessarily have to be provided with rollers.

[0083] In addition, in the present embodiment, the vinyl house H is described as an example of a simple structure, but the simple structure may be a greenhouse, a simple type warehouse, etc., and is not limited to the vinyl house H.

[0084] As described above, the preferred embodiments of the present invention have been described in detail, but it is natural that modifications, deformations, and changes can be made without departing from the scope of the claims.

Description of Reference Numerals

[0085] 1... Sheet winding device, 2... Light shielding sheet (sheet), 3... Winding shaft, 4... Guide member (guide part), 5... Holder, 6... Weight, 7... Sheet stopper, 50... Cylindrical portion, 50a... Opening, 52, 52A... First roller, 53, 53A... Second roller, 54... Third roller, F... Framework, H... Vinyl house (simple structure), M... Driving device, P... Aggregate, R... Ridge member

Claims

[Claim 1] A holder for supporting a winding shaft in a sheet winding device that has a winding shaft capable of winding and unwinding a sheet and stores and unfolds the sheet, comprising: a cylindrical portion having an opening large enough to allow the sheet to pass through but not allow the winding shaft to pass through; A plurality of rollers are provided on the cylindrical portion, The plurality of rollers include a first roller rotatably provided at one opening end of the cylindrical portion in the circumferential direction; a second roller that is rotatably provided at a position adjacent to the first roller on the cylindrical portion in the circumferential direction of the cylindrical portion on the opposite side to the opening, and that is capable of supporting the winding shaft from below together with the first roller and the roll-shaped sheet wound around the winding shaft; a third roller rotatably provided at the other opening end of the cylindrical portion in the circumferential direction, The first roller and the third roller protrude toward the opening side. A holder characterized by:

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