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] The present invention relates to a holder. [Background technology]

[0002] Simple structures such as vinyl greenhouses, greenhouses, and simple warehouses may be provided with sheet winding devices such as ventilation devices that open and close an opening / closing sheet that covers an opening in the simple structure to provide ventilation, and shading devices that deploy and store a shading sheet that covers a covering sheet stretched over a framework from the inside or outside of the simple structure to adjust the amount of sunlight that falls on plants grown within the simple structure.

[0003] For example, such a sheet winding device includes a winding shaft that is attached to the lower end of an opening / closing sheet or a shading sheet (hereinafter referred to as a "sheet") and rolls on an arch-shaped framework that forms a simple structure to wind and pay out the sheet, and a drive device that is provided at one end of the winding shaft to rotate the winding shaft (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-299365 Summary of the Invention [Problem to be solved by the invention]

[0005] In a conventional sheet winding device, when winding a sheet, the winding shaft rotates and moves toward the top of the simple structure, so the drive unit provided at one end of the winding shaft also moves toward the top of the simple structure together with the winding shaft. Therefore, in a conventional sheet winding device, the drive unit cannot be fixed to the simple structure.

[0006] Then, due to the weight of the drive device attached to one end of the winding shaft, only the drive device side of the sheet is pulled downward, causing the winding shaft to become tilted so that one end is positioned lower than the other end.

[0007] When the sheet is wound around the winding shaft in this state, the winding shaft will meander and the sheet cannot be wound evenly on one end and the other end of the winding shaft, so that when the sheet is stored, part of the sheet will not be wound around the winding shaft.

[0008] In particular, when the sheet covers the roof surface of a temporary structure, when the sheet is stored, in addition to the roll-shaped portion of the sheet that is wound around the winding shaft, a shadow will be cast inside the temporary structure by the part of the sheet that is not wound around the winding shaft.

[0009] The above problem can be solved if the winding shaft can be rotated in place without moving it relative to the simple structure to enable winding and unwinding of the sheet. However, simply supporting the winding shaft rotatably and attaching it to the simple structure does not allow the winding shaft to rotate to wind and unwind the sheet, and deterioration of the sheet during winding and unwinding cannot be prevented.

[0010] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a holder that is suitable for a sheet winding device that rotatably supports a winding shaft to allow winding and unwinding of a sheet while preventing deterioration of the sheet. [Means for solving the problem]

[0011] The holder of the present invention for achieving the above object is 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, and is characterized by comprising a tubular portion having an opening that allows the sheet to enter and exit, a first roller rotatably provided at one end of the opening in the circumferential direction of the tubular portion, a second roller rotatably provided at a position adjacent to the first roller in the circumferential direction of the tubular portion on the opposite side of the opening and capable of supporting the winding shaft from below together with the first roller, and a third roller rotatably provided at the other end of the opening in the circumferential direction of the tubular portion. According to this configuration, when the winding shaft is rotated while being 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, the first roller and the second roller roll when the sheet is wound and unwound, so that the sheet can be smoothly wound and unwound without resistance from the holder. In addition, since a first roller is provided at one open end of the tube, the first roller provided at the tube rotates when the sheet enters or leaves the tube, so the sheet is less likely to receive resistance from the holder and deterioration of the sheet can be prevented. Furthermore, since a third roller is provided at the other open end of the tube, even if the sheet comes into contact with the third roller when the sheet enters or leaves the tube, the third roller rotates, so the sheet is less likely to receive resistance from the holder and deterioration of the sheet can be prevented. Effect of the Invention

[0012] According to the holder of the present invention, the take-up shaft is rotatably supported to allow the sheet to be taken up and unwound, and deterioration of the sheet can be prevented. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view of the simplified structure of the present embodiment, with a portion cut away. [Diagram 2] FIG. 2 is a front view of the simplified structure of the present embodiment. [Diagram 3]1 is an enlarged front view showing a state in which a winding shaft in a sheet winding device is supported by a holder connected to a framework of the simplified structure of the present embodiment. FIG. [Figure 4] FIG. 2 is a perspective view showing a holder in the sheet winding device of the present embodiment. [Diagram 5] 4 is a view in which the holder in the enlarged front view of FIG. 3 is changed to a holder of another type. [Figure 6] 2 is an enlarged perspective view showing a lower end portion of a sheet in the sheet winding device of the embodiment; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present embodiment will now be described with reference to the drawings, in which like reference numerals denote like parts throughout the several views.

[0015] In this embodiment, as shown in Figures 1 and 2, the simple structure is a vinyl greenhouse H configured in an arch shape, comprising a framework F consisting of a plurality of arch-shaped aggregates P arranged in a line along the depth direction, a ridge material R connected to the inside of the tops of the aggregates P and extending along the depth direction, and a covering sheet S stretched on the outside of the framework F.

[0016] The ridge material 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 greenhouse H, and is positioned horizontally to the ground.

[0017] The vinyl greenhouse H is also provided with a sheet winding device 1 capable of storing and unfolding a shading sheet 2, which is a sheet provided inside a framework F as shown in Figs.

[0018] Next, each part of the vinyl greenhouse H of this embodiment will be described in detail. As shown in Figs. 1 and 2, the aggregate P has a pair of left and right standing parts Pa, Pa that stand up straight from the ground when viewed from the front, and an approximately arc-shaped arch part Pb that connects the upper ends of the standing parts Pa, Pa, and is configured in an arch shape. In addition, the lower ends of the standing parts Pa are buried in the ground and aligned along the depth direction. However, the aggregate P may be configured in a mountain shape by making the arch parts Pb inclined diagonally inward from the upper ends of the standing parts to be connected to each other.

[0019] Although not shown, a plurality of sheet fixing frames are attached to the outer periphery of each aggregate P, spanning the sides of the upright portions Pa and the arch portions Pb of each aggregate P. The sheet fixing frames have grooves, and when an elastic member is inserted into the grooves of the sheet fixing frames with the covering sheet S inserted therein, the covering sheet S is fixed to the sheet fixing frames. In this manner, the covering sheet S covering the framework F is fixed to each sheet fixing frame, so that the covering sheet S is spread over the entire outside of the framework F.

[0020] In addition, in Figures 1 and 2, the structure of the gable side of the vinyl greenhouse H is omitted in order to make it easier to understand the structure of the sheet winding device 1, which will be described later. In reality, however, the gable side of the vinyl greenhouse H is provided with an opening that serves as an entrance and exit into the vinyl greenhouse H, a covering sheet that covers all but the opening on the gable side of the vinyl greenhouse H, and a door that opens and closes the opening.

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

[0022] In addition, in this embodiment, a single-building vinyl greenhouse H that is installed independently has been described, but the vinyl greenhouse H may be a connected-building type in which multiple buildings are connected side by side in the width direction.

[0023] Next, the sheet winding device 1 of this embodiment will be described in detail. As shown in Fig. 1 and Fig. 2, the sheet winding device 1 is a device that is provided inside a framework F and winds and unwinds a shading sheet 2 that can be deployed in a range from the top of the framework F to one side on the right side in Fig. 2. Specifically, the sheet winding device 1 includes a winding shaft 3 that is disposed so as to cross the framework P inside the framework F and is supported rotatably about its axis relative to the framework F and is attached to the upper end of the shading sheet 2 so as to be able to wind and unwind the shading sheet 2, a driving device M that is provided at one end of the winding shaft 3 and drives the winding shaft 3 to rotate, and a guide member 4 as a guide portion that guides the movement of the lower end of the shading sheet 2 when the shading sheet 2 is wound and unwound.

[0024] 1 and 3, the winding shaft 3 in this embodiment is a pipe material extending along the depth direction of the vinyl greenhouse H, and is supported rotatably about its axis with respect to the ridge material R of the framework F via a holder 5 described later. The winding shaft 3 is also connected to the upper end of the shading sheet 2. The shading sheet 2 can be wound onto the winding shaft 3 by rotating a drive device M provided at one end of the winding shaft 3.

[0025] Although not described in detail, the driving device M in this embodiment is a motor that is fixedly supported to the ridge material R by a hanging device (not shown) provided at one end of the ridge material R. However, the means for installing the driving device M in the vinyl greenhouse H is not particularly limited, and for example, a stand may be installed in the vinyl greenhouse H and the driving device M may be supported on the upper end of the stand. In addition, the configuration of the driving device M is not particularly limited as long as it can rotate the winding shaft 3. For example, the driving device M may be composed of a motor installed on the ground and a transmission mechanism that connects the output shaft of the motor to one end of the winding shaft 3 and transmits the rotation of the output shaft of the motor.

[0026] As will be described in more detail later, in this embodiment, there are multiple guide members 4, and as shown in Figure 2, they are pipes that are installed downward to the right, spanning from the lower end of the right side of the arch portion Pb of each aggregate P to the upper end of the left side from the top of the arch portion Pb, and support from below the weight 6, described later, which is connected to the lower end of the shading sheet 2.

[0027] 2, with the light-shielding sheet 2 deployed inside the framework F in a range from the top to one side on the right side in the figure, when the winding shaft 3 is rotated in the forward direction by the driving device M, the light-shielding sheet 2 is wound up around the winding shaft 3 while its lower end is guided by the guide member 4. Then, when the light-shielding sheet 2 is wound up around the winding shaft 3 near its lower end, the light-shielding sheet 2 is stored.

[0028] Conversely, when the shading sheet 2 is stored in the winding shaft 3 and the driving device M drives the winding shaft 3 to rotate in the reverse direction, the shading sheet 2 is unwound from the winding shaft 3, and the lower end of the shading sheet 2 gradually approaches the side of the framework F while being guided by the guide member 4. When the shading sheet 2 is unwound from the winding shaft 3 until the lower end of the shading sheet 2 moves close to one side of the framework F, the shading sheet 2 is in an unfolded state. In this way, when unfolded, the shading sheet 2 covers one side of the roof surface of the vinyl greenhouse H from the inside, blocking sunlight.

[0029] Therefore, the sheet winding device 1 of the present embodiment can adjust the amount of sunlight falling on the plants grown in the vinyl greenhouse H by driving the winding shaft 3 with the drive device M to unfold or retract the shading sheet 2.

[0030] Moreover, in such a sheet winding device 1, the winding shaft 3 having a drive unit M at one end is attached to the upper end of the shading sheet 2. Therefore, the load of the drive unit M does not act on the lower end of the shading sheet 2. Therefore, when a drive unit is attached to one end of the winding shaft attached to the lower end of the sheet as in the conventional sheet winding device, the load does not concentrate on one side of the lower end of the sheet, making it impossible to wind the sheet evenly around the winding shaft, and only a part of the shading sheet 2 is not pulled, so the shading sheet 2 can be wound evenly on one end side and the other end side of the winding shaft 3. Therefore, when storing the shading sheet 2, all of the shading sheet 2 can be wound around the winding shaft 3.

[0031] The material and structure of the shading sheet 2 are not particularly limited as long as it is flexible enough to be wound around the winding shaft 3 and can reduce the amount of sunlight passing through. For example, the shading sheet 2 may be made of a material with a high light-blocking rate or may be formed in a mesh pattern.

[0032] Next, a detailed description will be given of each part of the sheet winding device 1. As shown in Figures 1 and 3, the winding shaft 3 in this embodiment is a pipe material extending along the depth direction of the vinyl greenhouse H, and is supported rotatably around the shaft with respect to the ridge material R of the framework F via a plurality of holders 5 connected to the ridge material R at predetermined intervals along the depth direction of the vinyl greenhouse H.

[0033] Specifically, as shown in Figures 3 and 4, each holder 5 has a cylindrical tube portion 50 which allows the shading sheet 2 to pass in and out and has an opening 50a facing the lower end side of the shading sheet 2 in the unfolded state (diagonally downward to the right in Figure 3), and an attachment piece 51 which stands vertically from the upper end of the tube portion 50 and can be connected to the ridge material R via a mounting bracket J, and the winding shaft 3 is accommodated within the tube portion 50.

[0034] Here, when the winding shaft 3 is positioned horizontally to the ground, the shading sheet 2 can be wound up evenly in the axial direction around the winding shaft 3 when the shading sheet 2 is wound up, so it is preferable that the winding shaft 3 be positioned horizontally to the ground.

[0035] The holders 5 are connected to the inside of the tops of the aggregates P, extend along the depth direction of the vinyl greenhouse H, and are installed at a specified interval on the ridge material R that is installed horizontally to the ground. Therefore, the line passing through the center of the cylindrical part 50 of each holder 5 is parallel to the axial direction of the ridge material R, that is, horizontal to the ground.

[0036] 3, when the winding shaft 3 is housed in the tubular portion 50 of each holder 5 connected to the ridge material R, the winding shaft 3 is arranged horizontally to the ground. In this manner, in this embodiment, when installing the sheet winding device 1 in the vinyl greenhouse H, the winding shaft 3 can be easily arranged horizontally to the ground by utilizing the existing ridge material R that is arranged horizontally to the ground. Note that the shape of the ridge material R is not limited to a cylindrical shape, and may be, for example, a square tube shape.

[0037] Although not described in detail, the mounting piece 51 is a plate material that stands vertically from the flat surface 50b, which is a flat surface provided on the upper part of the tubular part 50, as shown in Fig. 4, and has a hole 51a. Then, as shown in Fig. 3, a bolt B is inserted into a hole (not shown) provided in the mounting bracket J suspended from the ridge material R and into the hole 51a of the mounting piece 51, and a wing nut N is screwed into the threaded part of the bolt B, so that the holder 5 is connected to the ridge material R. However, the configuration of the mounting piece 51 and the mounting bracket J described above is one example, and the configuration of the mounting piece 51 and the mounting bracket J is not particularly limited as long as the holder 5 can be connected to the ridge material R.

[0038] In addition, in this embodiment, the opening 50a that allows the light blocking sheet 2 to enter and exit is provided at a position facing the lower end side of the light blocking sheet 2 in the unfolded state in the tube portion 50 (diagonally lower right side in FIG. 4), so that the light blocking sheet 2 smoothly enters the tube portion 50 when rolled up. However, the position of the opening 50a in the tube portion 50 does not have to be a position facing the lower end side of the light blocking sheet 2 in the unfolded state in the tube portion 50, and for example, the opening 50a may be provided facing downward in the vertical direction of the tube portion 50.

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

[0040] Furthermore, the inner diameter of the tube portion 50 may be set to be equal to or larger than the diameter of the roll-shaped light blocking sheet 2 wound around the winding shaft 3 when the light blocking sheet 2 is stored. Furthermore, in this embodiment, the tube portion 50 is formed in a cylindrical shape, but the cross-sectional shape of the tube portion 50 is not particularly limited, and may be, for example, a square tube shape.

[0041] As shown in Figures 3 and 4, the holder 5 includes a first roller 52 rotatably mounted at one opening side end located on the left side in Figure 3 across the opening 50a in the tubular portion 50, a second roller 53 mounted adjacent to the first roller 52 in the tubular portion 50 on the opposite side from the opening (left side in Figure 3) in the circumferential direction of the tubular portion 50, and a third roller 54 rotatably mounted at the other opening side end located on the right side in Figure 3 of the tubular portion 50.

[0042] As shown in FIG. 3, the winding shaft 3 is housed in the cylindrical portion 50 and is supported from below between a first roller 52 and a second roller 53 so as to be rotatable about its axis.

[0043] In this state, when the winding shaft 3 is driven to rotate, the first roller 52 and the second roller 53 rotate in accordance with the rotation of the winding shaft 3 because the direction of the rotation axis of the first roller 52 and the second roller 53 is the same as that of the winding shaft 3. Then, when the light blocking sheet 2 is wound up and unwound, the first roller 52 and the second roller 53 roll, so that the light blocking sheet 2 can be smoothly wound up and unwound without resistance from the holder 5. In addition, since the first roller 52 is provided at one opening side end, which is the left side in FIG. 3 of the tube part 50, the first roller 52 provided at the tube part 50 rotates when the light blocking sheet 2 enters and leaves the tube part 50, so that the light blocking sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light blocking sheet 2 can be prevented. Therefore, by providing the first roller 52 and the second roller 53 at the tube part 50, deterioration of the light blocking sheet 2 is suppressed.

[0044] 3, a third roller 54 having the same rotation axis direction as the winding shaft 3 is provided at the other opening end of the tube portion 50. Then, even if the light-shielding sheet 2 comes into contact with the third roller 54 when it enters or leaves the tube portion 50, the third roller 54 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. However, the third roller 54 may be omitted.

[0045] The number and positions of the rollers provided in the tubular 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 end of the tubular portion 50, and a second roller 53A provided at the other opening end of the tubular portion 50, and may support the winding shaft 3 from below between the first roller 52A and the second roller 53A so that the winding shaft 3 can rotate around its axis.

[0046] 3, when the winding shaft 3 is driven to rotate, the first roller 52A and the second roller 53A rotate in accordance with the rotation of the winding shaft 3. Therefore, when the light blocking sheet 2 is wound up and unwound, the light blocking sheet 2 can be smoothly wound up and unwound without resistance from the holder 5. Furthermore, since the first roller 52A and the second roller 53A are provided at each opening side end of the tube portion 50, the first roller 52A and the second roller 53A rotate when the light blocking sheet 2 enters and leaves the tube portion 50, so that the light blocking sheet 2 is less likely to encounter resistance from the holder 5, and deterioration of the light blocking sheet 2 can be prevented.

[0047] Therefore, according to the holder 5A shown in Fig. 5, the second roller 53A serves both the functions of the second roller 53 and the third roller 54 in the holder 5 shown in Fig. 3, so that it is possible to reduce the number of rollers while achieving the same effect as the holder 5. However, the holders 5 and 5A do not necessarily have to include rollers.

[0048] Next, the guide member 4 of this embodiment will be described in detail. In this embodiment, there are a plurality of guide members 4, each of which is provided for each aggregate P, as shown in Fig. 1. Specifically, as shown in Fig. 2, the guide member 4 is a pipe that is installed so as to extend from the lower end of the arch portion Pb on the right side of the apex of the aggregate P to the vicinity of the upper end of the arch portion Pb on the left side of the apex of the aggregate P, and is inclined along the slope of the roof surface from the apex of the vinyl greenhouse H to one side portion, which is the right side in Fig. 2.

[0049] In this way, the guide members 4 in this embodiment are positioned above and below at intervals below one side of the roof surface from the top to one side of the vinyl greenhouse H, and are positioned below the shading sheet 2, installed relative to the aggregate P so as to be approximately parallel to the slope of the roof surface.

[0050] Therefore, when the shading sheet 2 is unfolded, as shown in Fig. 2, the shading sheet 2 is supported from below by a plurality of guide members 4 provided on each aggregate P. Therefore, when the shading sheet 2 is rolled up, the lower end of the shading sheet 2 abuts against the guide members 4 and moves toward the winding shaft 3 while being guided by the guide members 4. Also, when the shading sheet 2 is unrolled, the lower end of the shading sheet 2 abuts against the guide members 4 and moves toward the side of the vinyl greenhouse H, which is the side opposite the winding shaft, while being guided by the guide members 4.

[0051] In this embodiment, each end of the guide member 4 is connected to the aggregate P via a bracket (not shown), but the method of connecting the guide member 4 to the aggregate P is not particularly limited. The mounting angle of the guide member 4 to the aggregate P can be changed as appropriate, and does not have to be parallel to the slope of the roof surface of the vinyl greenhouse H.

[0052] 6, a rod-shaped weight 6 is connected to the lower end of the shading sheet 2 via a sheet stopper 7, which will be described later, and when the shading sheet 2 is wound up and unwound, the weight 6 prevents the lower end of the shading sheet 2 from flapping and allows it to move up and down along the guide member 4, preventing the shading sheet 2 from curling up. In addition, the weight of the weight 6 pulls the shading sheet 2 downward, applying tension to the shading sheet 2 and suppressing bending of the shading sheet 2.

[0053] Specifically, the weight 6 is a pipe material arranged parallel to the winding shaft 3, and its axial length is set to be greater than or equal to the length of the light-shielding sheet 2 in the width direction along the axial direction of the winding shaft 3 (hereinafter simply referred to as the "width direction"). The weight 6 is attached to the lower end of the light-shielding sheet 2 with the center of the light-shielding sheet 2 in the width direction aligned with the center of the weight 6 in the axial direction. As a result, the load of the weight 6 is applied evenly to the light-shielding sheet 2, so that 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 up evenly in the axial direction around the winding shaft 3.

[0054] The diameter, material, and shape of the weight 6 are not particularly limited as long as the weight is a rod-like shape whose cross-sectional shape does not change in the axial direction, and for example, the weight 6 may be solid. However, if the weight of the weight 6 is too heavy, the force pulling the shading sheet 2 downward becomes large, which may cause deterioration of the shading sheet 2 or require an increase in the output of the drive device M that rotates the winding shaft 3. Therefore, the weight of the weight 6 should be such that it can apply a tension to the shading sheet 2 that is sufficient to prevent the shading sheet 2 from curling up while suppressing bending of the shading sheet 2.

[0055] Furthermore, if the load of the weight 6 does not have to be uniformly applied to the shading sheet 2, the weight 6 does not have to be rod-shaped, and for example, a plurality of weights may be connected at intervals in the width direction to the lower end of the shading sheet 2. Furthermore, if the weight of the shading sheet 2 can be sufficiently prevented from curling up or bending, the weight 6 may be omitted.

[0056] In this embodiment, the weight 6 is connected to the lower end of the light blocking sheet 2 by a plurality of sheet fastening members 7 arranged at predetermined intervals along the axial direction. As shown in Fig. 6, the sheet fastening member 7 has an opening 7a whose width is narrower than the diameter of the weight 6, is a C-shaped cylinder whose inner diameter is approximately equal to the diameter of the weight 6, and is elastic.

[0057] Then, with the lower end of the light-shielding sheet 2 wrapped around the outer periphery of the weight 6, the opening 7a of the sheet fastening material 7 is pushed open and the weight 6 is fitted inside the sheet fastening material 7 through the opening 7a, whereby the light-shielding sheet 2 is sandwiched between the outer periphery of the weight 6 and the inner periphery of the sheet fastening material 7, and the weight 6 is connected to the lower end of the light-shielding sheet 2.

[0058] 3, the sheet retaining material 7 is provided in a mounting orientation such that the opening 7a faces upward (opposite the guide member 4) 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 retaining material 7. When the shading sheet 2 is wound up and unwound, the weight 6 moves as if 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 retaining material 7.

[0059] Therefore, even if the lower end of the shading sheet 2 is pressed against the guide member 4 by the weight of the weight 6, the shading sheet 2 does not directly contact the guide member 4, so that it is possible to prevent the shading sheet 2 from rubbing against the guide member 4 and deteriorating when the shading sheet 2 is wound up or unwound. The sheet retaining member 7 may be attached to the weight 6 in any direction as long as the opening 7a does not face the guide member 4.

[0060] The number of sheet fastening materials 7 may be appropriately determined depending on the required mounting strength of the weight 6, but by attaching the sheet fastening materials 7 at at least two locations that are approximately equidistant from the axial center of the weight 6 and face the guide member 4, it is possible to prevent the weight 6 from tilting.

[0061] Furthermore, the configuration of the sheet fastening material 7 described above is one example, and the sheet fastening material 7 is not particularly limited as long as it is capable of connecting the weight 6 to the lower end of the light blocking sheet 2. Regardless of the configuration of the sheet fastening material, by disposing the sheet fastening material between the light blocking sheet 2 and the guide member 4 and separating the light blocking sheet 2 from the guide member 4, it is possible to prevent the light blocking sheet 2 from rubbing against the guide member 4 and thereby causing deterioration. However, if it is not necessary to prevent the light blocking sheet 2 from rubbing against the guide member 4, the sheet fastening material does not have to abut against the guide member 4.

[0062] In this embodiment, the shading sheet 2 of the sheet winding device 1 covers only one side of the roof surface of the vinyl greenhouse H from the inside when unfolded, but two sheet winding devices 1 may be installed on the vinyl greenhouse H to cover both the left and right sides of the roof surface of the vinyl greenhouse H from the inside in Fig. 2. In that case, the guide member that guides the movement of the lower end of the shading sheet 2 when winding and unwinding the shading sheet 2 may be, for example, an arch-shaped member that is arranged inside the arch portion Pb of the aggregate P with a gap therebetween.

[0063] As described above, the sheet winding device 1 of this embodiment is installed in a vinyl greenhouse H, which is a simple structure having a framework F formed by arranging a number of arch-shaped or mountain-shaped aggregates P along the depth direction, and is capable of storing and deploying a shading sheet 2 as a sheet installed inside the framework F. The sheet winding device 1 is equipped with a winding shaft 3 that is arranged across the aggregates P, attached to the upper end of the shading sheet 2 and supported rotatably about its axis relative to the framework F, and is capable of winding up and unwinding the shading sheet 2, a drive device that is provided at one end of the winding shaft 3 and drives the winding shaft 3 to rotate, and a guide member 4 as a guide section that guides the movement of the lower end of the shading sheet 2 when winding up and unwinding the shading sheet 2.

[0064] According to the sheet winding device 1 configured in this manner, the winding shaft 3 is attached to the upper end of the shading sheet 2, and the load of the driving device is not applied to the lower end of the shading sheet 2, so that the shading sheet 2 can be evenly wound on one end side and the other end side of the winding shaft 3. Therefore, when the shading sheet 2 is stored, all of the shading sheet 2 can be wound around the winding shaft 3.

[0065] In this embodiment, since the shading sheet 2 covers the roof surface of the vinyl greenhouse H, if all of the shading sheet 2 can be wound up around the winding shaft 3 in this manner, the size of the shadow cast inside the vinyl greenhouse H by the winding shaft 3 and the shading sheet 2 can be minimized when the shading sheet 2 is stored.

[0066] In this embodiment, the sheet winding device 1 deploys or stores the shading sheet 2 that covers the roof surface of the vinyl greenhouse H from the inside, but the sheet winding device 1 may also deploy or store the shading sheet 2 that covers the outside of the covering sheet S that constitutes the roof surface of the vinyl greenhouse H. In that case, the winding shaft 3 may be rotatably installed from the outside on the top of the framework F, and the upper part of each aggregate P may function as a guide part that guides the movement of the lower end of the shading sheet 2 when the shading sheet 2 is wound and unwound.

[0067] The sheet winding device 1 may also be one that deploys or stores the shading sheet 2 that covers the inside or outside of the side of the vinyl greenhouse H. In that case, the winding shaft 3 is rotatably installed on the shoulder part or the upper part of the standing part Pa, which is the boundary part between the standing part Pa and the arch part Pb of each aggregate P, and a plurality of guide pipes are erected near each standing part Pa, and the shading sheet 2 is disposed between the standing part Pa and the guide pipes. In that case, the guide pipes become guide parts that guide the movement of the lower end of the shading sheet 2 when the shading sheet 2 is wound up and unwound. By providing such guide pipes, it is possible to prevent the shading sheet 2 that covers the side of the vinyl greenhouse H from approaching or moving away from the aggregate P.

[0068] In addition, in this embodiment, the sheet winding device 1 functions as a shading device that deploys or stores the shading sheet 2, but, for example, the sheet deployed or stored by the sheet winding device 1 may also be a transparent opening / closing sheet that opens and closes an opening provided on the roof surface or side of the vinyl greenhouse H.

[0069] In addition, the sheet winding device 1 of this embodiment is equipped with a rod-shaped weight 6 connected to the lower end of the shading sheet 2 and arranged parallel to the winding shaft 3, and the axial length of the weight 6 is greater than or equal to the widthwise length of the shading sheet 2 along the axial direction of the winding shaft 3, and the weight 6 is attached to the shading sheet 2 so that the center of the width of the shading sheet 2 coincides with the center of the axial direction of the weight 6.

[0070] With the sheet winding device 1 configured in this manner, the weight of the weight 6 can prevent the shading sheet 2 from curling up or bending, and since the load of the weight 6 is applied evenly to the shading sheet 2, when the shading sheet 2 is wound up, the shading sheet 2 can be wound up evenly in the axial direction around the winding shaft 3.

[0071] Further, the sheet winding device 1 of this embodiment is provided with a sheet retaining member 7 that connects the weight 6 to the lower end of the light blocking sheet 2, and the weight 6 abuts against the guide member 4 via the sheet retaining member 7.

[0072] With the sheet winding device 1 configured in this manner, even if the lower end of the shading sheet 2 is pressed against the guide member 4 by the weight of the weight 6, the shading sheet 2 does not come into direct contact with the guide member 4, and therefore it is possible to prevent the shading sheet 2 from rubbing against the guide member 4 and deteriorating when the shading sheet 2 is wound up or unwound. However, if the shading sheet 2 is sufficiently prevented from curling up or bending due to its own weight, the weight 6 may be omitted.

[0073] In addition, the sheet winding device 1 of this embodiment is equipped with a holder 5 that is connected to the framework F to support the winding shaft 3 rotatably around its axis and has an opening 50a that allows the shading sheet 2 to pass in and out when the shading sheet 2 is wound up and unwound, and multiple holders 5 are provided at predetermined intervals along the depth direction of the vinyl greenhouse H.

[0074] According to the sheet winding device 1 configured in this manner, by retrofitting the holder 5 to an existing vinyl greenhouse H, the winding shaft 3 can be supported rotatably about its axis relative to the framework F, making it easy to install the sheet winding device 1 in the existing vinyl greenhouse H. However, a support portion that supports the winding shaft 3 rotatably about its axis may be provided in advance in the framework F.

[0075] In addition, in the sheet winding device 1 of this embodiment, each holder 5 is connected to the inside of the top of the aggregate P by the framework F and to a ridge material R arranged along the depth direction of the vinyl greenhouse H, and has a tubular portion 50 that accommodates the winding shaft 3.

[0076] Here, when the winding shaft 3 is positioned horizontally to the ground, the shading sheet 2 can be wound up evenly in the axial direction around the winding shaft 3 when the shading sheet 2 is wound up, so it is preferable that the winding shaft 3 be positioned horizontally to the ground.

[0077] In contrast, the ridge material R is connected to the inside of the top of the aggregate P and extends along the depth direction of the vinyl greenhouse H, and is therefore installed horizontally to the ground. Therefore, the line passing through the centers of the cylindrical parts 50 of the multiple holders 5 connected to the ridge material R is parallel to the axial direction of the ridge material R, that is, horizontal to the ground.

[0078] Therefore, according to the sheet winding device 1 configured in this manner, the winding shaft 3 housed in the cylindrical portion 50 of each holder 5 is arranged horizontally to the ground. Therefore, when installing the sheet winding device 1 in the vinyl greenhouse H, it is easy to arrange the winding shaft 3 horizontally to the ground by using an existing ridge material R arranged horizontally to the ground. However, the holder 5 may be connected to a part of the framework F other than the ridge material R.

[0079] In addition, in the sheet winding device 1 of this embodiment, the holder 5 has a tubular portion 50 having an opening 50a, a first roller 52 rotatably arranged at one opening side end of the tubular portion 50, and a second roller 53 rotatably arranged at a position adjacent to the first roller 52 in the circumferential direction of the tubular portion 50 on the opposite opening side, and the winding shaft 3 is housed within the tubular portion 50 and supported from below between the first roller 52 and the second roller 53 so as to be rotatable around the axis.

[0080] According to the sheet winding device 1 configured in this manner, when the winding shaft 3 is driven to rotate, the first roller 52 and the second roller 53 rotate in accordance with the rotation of the winding shaft 3. Then, when the light blocking sheet 2 is wound up and unwound, the first roller 52 and the second roller 53 roll, so that the light blocking sheet 2 can be smoothly wound up and unwound without resistance from the holder 5. In addition, since the first roller 52 is provided at one opening side end of the tube part 50, the first roller 52 provided in the tube part 50 rotates when the light blocking sheet 2 enters and leaves the tube part 50, so that the light blocking sheet 2 is less likely to receive resistance from the holder 5, and deterioration of the light blocking sheet 2 can be prevented. Therefore, deterioration of the light blocking sheet 2 is suppressed.

[0081] Furthermore, in the sheet winding device 1 of this embodiment, a third roller 54 is rotatably provided at the other open side end of the tube portion 50. According to the sheet winding device 1 configured in this manner, even if the light-shielding sheet 2 comes into contact with the third roller 54 when the light-shielding sheet 2 enters or leaves the tube portion 50, the third roller 54 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. However, the third roller 54 may be omitted.

[0082] 5, the holder 5A may be configured so that the first roller 52A is provided at one opening end of the tubular portion 50, and the second roller 53A is provided at the other opening end of the tubular portion 50. In this way, the second roller 53A serves both the functions of the second roller 53 and the third roller 54 in the holder 5 shown in FIG. 3, so that the number of rollers can be reduced while achieving the same effect as the holder 5. However, the holders 5 and 5A do not have to be provided with rollers.

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

[0084] Although the preferred embodiment of the present invention has been described in detail above, it will be appreciated that modifications, variations and changes can be made thereto without departing from the scope of the appended claims. [Explanation of symbols]

[0085] Reference Signs List 1 sheet winding device, 2 light-shielding sheet (sheet), 3 winding shaft, 4 guide member (guide section), 5 holder, 6 weight, 7 sheet fastening material, 50 cylinder section, 50a opening, 52, 52A first roller, 53, 53A second roller, 54 third roller, F framework, H vinyl greenhouse (simple structure), M drive device, P aggregate, R ridge material

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 tube portion having an opening that allows the sheet to enter and exit; 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 a circumferential direction of the cylindrical portion on a side opposite to the opening, and that can support the winding shaft from below together with the first roller; a third roller rotatably provided at the other opening end of the cylindrical portion in the circumferential direction thereof; A holder characterized by:

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