JP7690240B2 - Holder - Google Patents

Description

This invention relates to a holder.

In simple structures such as vinyl greenhouses, greenhouses, and simple warehouses, there are cases where a sheet winding device is provided, such as a ventilation device that opens and closes an opening sheet that covers an opening in the simple structure to provide ventilation, or a shading device that unfolds and stores 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 the plants grown in the simple structure.

One such sheet winding device is one that includes a winding shaft that is attached to the bottom end of an opening/closing sheet or a light-shielding sheet (hereinafter referred to as the "sheet") and rolls on an arch-shaped framework that forms a simple structure to wind and unwind the sheet, and a drive device that is provided at one end of the winding shaft and drives the winding shaft to rotate (for example, Patent Document 1).

Japanese Patent Application Publication No. 11-299365

In conventional sheet winding devices, 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 conventional sheet winding devices, the drive unit cannot be fixed to the simple structure.

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 tilt so that one end is positioned lower than the other end.

If the sheet is wound onto the winding shaft in this state, the winding shaft will meander and the sheet cannot be wound evenly onto one end and the other end of the winding shaft, so when the sheet is stored, part of the sheet will not be wound onto the winding shaft.

In particular, when the sheet covers the roof surface of a simple 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 is cast inside the simple structure by the part of the sheet that is not wound around the winding shaft.

The above problem can be solved if the winding shaft can be rotated in place without moving it relative to the simple structure, allowing the sheet to be wound and unwound. However, simply supporting the winding shaft so that it can rotate and attaching it to the simple structure does not allow the sheet to be wound and unwound by rotating the winding shaft, and deterioration of the sheet when it is wound and unwound cannot be prevented.

Therefore, the present invention aims to provide a holder that is suitable for a sheet winding device that rotatably supports the winding shaft to allow the sheet to be wound and unwound while preventing deterioration of the sheet.

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, the holder comprising a tubular portion having an opening that allows the sheet to enter and exit but does not allow the winding shaft to pass through , and a plurality of rollers provided in the tubular portion, the plurality of rollers including 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 roll-like sheet wound on the winding shaft , and a third roller rotatably provided at the other end of the opening in the circumferential direction of the tubular portion , the first roller and the third roller protruding toward the opening side . According to this configuration, when the winding shaft is driven to rotate with the winding shaft 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 up and unwound, the first roller and the second roller roll, so that the sheet can be wound up and unwound smoothly and can be wound up and unwound without resistance from the holder. Also, since the first roller is provided at one opening end of the tube portion, the first roller provided at the tube portion rotates when the sheet enters and leaves the tube portion, so that the sheet is less likely to receive resistance from the holder and deterioration of the sheet can be prevented. Furthermore, since the third roller is provided at the other opening end of the tube portion, even if the sheet comes into contact with the third roller when the sheet enters and leaves the tube portion, the third roller rotates, so that the sheet is less likely to receive resistance from the holder and deterioration of the sheet can be prevented.

The holder of the present invention rotatably supports the winding shaft, allowing the sheet to be wound and unwound while preventing deterioration of the sheet.

FIG. 2 is a perspective view of the simplified structure of the present embodiment, with a portion cut away. FIG. 2 is a front view of the simplified structure of the present embodiment. 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. FIG. 2 is a perspective view showing a holder in the sheet winding device of the present embodiment. 4 is a view in which the holder in the enlarged front view of FIG. 3 is changed to a holder of another type. 2 is an enlarged perspective view showing a lower end portion of a sheet in the sheet winding device of the embodiment; FIG.

The present embodiment will be described below with reference to the drawings. The same reference numerals are used throughout the drawings to indicate the same parts.

In this embodiment, as shown in Figures 1 and 2, the simple structure is an arch-shaped vinyl greenhouse H that includes a framework F made up of multiple arch-shaped aggregates P arranged in a line along the depth direction, ridge members 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.

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.

The greenhouse H is also provided with a sheet winding device 1 that can store and unfold the shading sheet 2 that is provided inside the framework F as shown in Figures 1 and 2.

Next, each part of the vinyl greenhouse H of this embodiment will be described in detail. As shown in Figures 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 each standing part Pa, Pa, and is configured in an arch shape. In addition, the lower ends of the standing parts Pa of the multiple aggregates P are buried in the ground and aligned along the depth direction. However, the aggregate P may also be configured in a mountain shape by forming the arch parts Pb into a mountain shape in which the upper ends of each standing part are connected by inclining diagonally inward from each other.

Although not shown, multiple 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 a covering sheet S is inserted into the grooves of the sheet fixing frames and an elastic member is inserted into the grooves from above the covering sheet S, the covering sheet S is fixed to the sheet fixing frames. In this way, the covering sheet S that covers the framework F is fixed to each sheet fixing frame, so that the covering sheet S is stretched over the entire outside of the framework F.

In addition, in Figures 1 and 2, the structure of the end face of the vinyl greenhouse H is omitted in order to make it easier to understand the structure of the sheet winding device 1 described later. In reality, however, the end face 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 the end face of the vinyl greenhouse H except for the opening, and a door that opens and closes the opening.

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

In addition, in this embodiment, a single-building vinyl greenhouse H that is installed independently is described, but the vinyl greenhouse H may be a row-type greenhouse in which multiple buildings are lined up side by side in the width direction.

Next, the sheet winding device 1 of this 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 the shading sheet 2, which is provided inside the framework F and can be deployed in a range from the top of the framework F to one side on the right side in Fig. 2, and is provided with a winding shaft 3 that is disposed so as to cross the framework P inside the framework F and is supported rotatably around 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 drive unit 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 that serves as a guide section that guides the movement of the lower end of the shading sheet 2 when the shading sheet 2 is wound and unwound.

As shown in Figs. 1 and 3, the winding shaft 3 in this embodiment is a pipe material that extends 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 below. 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 the drive unit M provided at one end of the winding shaft 3.

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 to the vinyl greenhouse H is not particularly limited, and for example, a stand may be installed inside 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.

As will be described in more detail later, in this embodiment, there are multiple guide members 4, which 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 of the apex of the arch portion Pb, as shown in FIG. 2, and support from below the weight 6, which is connected to the lower end of the shading sheet 2 and will be described later.

With the sheet winding device 1 thus configured, as shown in FIG. 2, when the light-shielding sheet 2 is deployed inside the framework F in a range from the top to one side on the right side in the figure, and the winding shaft 3 is rotated in the forward direction by the drive unit M, the light-shielding sheet 2 is wound up on the winding shaft 3 while its bottom end is guided by the guide member 4. Then, when the light-shielding sheet 2 is wound up on the winding shaft 3 near its bottom end, the light-shielding sheet 2 is stored.

Conversely, when the shading sheet 2 is stored in the winding shaft 3 and the drive unit M drives the winding shaft 3 to rotate in the opposite 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 unfolded. 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 out sunlight.

The sheet winding device 1 of this embodiment can therefore adjust the amount of sunlight falling on the plants being 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.

In addition, in such a sheet winding device 1, the winding shaft 3 with the drive unit M at one end is attached to the upper end of the light-shielding sheet 2. Therefore, the load of the drive unit M does not act on the lower end of the light-shielding sheet 2. Therefore, when the 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 light-shielding sheet 2 is not pulled, so the light-shielding sheet 2 can be wound evenly on one end side and the other end side of the winding shaft 3. Therefore, when storing the light-shielding sheet 2, all of the light-shielding sheet 2 can be wound around the winding shaft 3.

The material and structure of the shading sheet 2 are not particularly limited, so long as it is flexible enough to be wound around the winding shaft 3 and can reduce the amount of sunlight that passes 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.

Next, each part of the sheet winding device 1 will be described in detail. As shown in Figures 1 and 3, the winding shaft 3 in this embodiment is a pipe material that extends along the depth direction of the vinyl greenhouse H, and is supported rotatably around the shaft by a plurality of holders 5 that are connected to the ridge material R of the framework F at predetermined intervals along the depth direction of the vinyl greenhouse H.

Specifically, as shown in Figs. 3 and 4, each holder 5 has a cylindrical tube portion 50 that allows the light blocking sheet 2 to move in and out and has an opening 50a at a position facing the lower end side of the light blocking sheet 2 in the unfolded state (diagonally downward right in Fig. 3), and an attachment piece 51 that 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 housed inside the tube portion 50.

Here, if the winding shaft 3 is placed horizontally to the ground, the shading sheet 2 can be wound 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 placed horizontally to the ground.

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, which is installed horizontally 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 material R, that is, horizontal to the ground.

Therefore, as shown in FIG. 3, when the winding shaft 3 is housed in the tube portion 50 of each holder 5 connected to the ridge material R, the winding shaft 3 is positioned horizontally relative to the ground. In this manner, in this embodiment, when installing the sheet winding device 1 in the vinyl greenhouse H, the existing ridge material R that is positioned horizontally relative to the ground is used, making it easy to position the winding shaft 3 horizontally relative 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.

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 tube part 50, as shown in FIG. 4, and has a hole 51a. Then, as shown in FIG. 3, the holder 5 is connected to the ridge material R by inserting a bolt B through a hole (not shown) provided in the mounting bracket J suspended from the ridge material R and the hole 51a in the mounting piece 51, and screwing a wing nut N into the threaded part of the bolt B. 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.

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 downward 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.

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 does not fall out of the tubular portion 50. However, the opening width of the opening 50a of the tubular portion 50 may be greater than or equal to the diameter of the winding shaft 3.

The inner diameter of the tube portion 50 only needs to be set to be equal to or greater than the diameter of the rolled light-shielding sheet 2 wound around the winding shaft 3 when the light-shielding sheet 2 is stored. In the present 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.

As shown in Figs. 3 and 4, the holder 5 includes a first roller 52 rotatably mounted on one end of the opening 50a in the tubular portion 50, which is located on the left side in Fig. 3, a second roller 53 mounted adjacent to the first roller 52 on the opposite side of the opening in the circumferential direction of the tubular portion 50 (left side in Fig. 3), and a third roller 54 rotatably mounted on the other end of the opening in the tubular portion 50, which is located on the right side in Fig. 3.

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

In this state, when the winding shaft 3 is rotated, 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-shielding sheet 2 is wound up and unwound, the first roller 52 and the second roller 53 roll, so that the light-shielding sheet 2 can be wound up and unwound smoothly 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 portion 50, when the light-shielding sheet 2 enters and leaves the tube portion 50, the first roller 52 provided on the tube 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, by providing the first roller 52 and the second roller 53 on the tube portion 50, deterioration of the light-shielding sheet 2 is suppressed.

A third roller 54, whose rotation axis is in the same direction as the winding shaft 3, is provided at the other open end of the tube 50, which is the right side in FIG. 3. Then, even if the light-blocking sheet 2 comes into contact with the third roller 54 when it enters or leaves the tube 50, the third roller 54 rotates, so 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. However, the third roller 54 may be omitted.

The number and positions of the rollers provided in the tube 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 open end of the tube portion 50 and a second roller 53A provided at the other open end of the tube portion 50, and the winding shaft 3 may be supported from below between the first roller 52A and the second roller 53A so that the winding shaft 3 can rotate about its axis.

With the holder 5A thus configured, as with the holder 5 shown in FIG. 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 end of the tube 50, the first roller 52A and the second roller 53A rotate when the light blocking sheet 2 enters and leaves the tube 50, so 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.

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 the number of rollers can be reduced while still achieving the same effect as the holder 5. However, the holders 5 and 5A do not necessarily have to have rollers.

Next, the guide member 4 of this embodiment will be described in detail. In this embodiment, there are multiple guide members 4, and as shown in FIG. 1, one is provided for each aggregate P. Specifically, as shown in FIG. 2, the guide member 4 is a pipe that is installed downward to the right and spans between the lower end to the right of the top of the arch portion Pb of the aggregate P and the upper end to the left of the top of the arch portion Pb, and is inclined along the slope of the roof surface from the top of the vinyl greenhouse H to one side, which is the right side in FIG. 2.

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

Therefore, when the shading sheet 2 is unfolded, as shown in FIG. 2, it is supported from below by a plurality of guide members 4 provided on each aggregate P. Therefore, when the shading sheet 2 is wound 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.

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. In addition, the attachment angle of the guide member 4 to the aggregate P can be changed as appropriate. It does not have to be parallel to the slope of the roof surface of the vinyl greenhouse H.

As shown in FIG. 6, a rod-shaped weight 6 is connected to the lower end of the light-blocking sheet 2 via a sheet stopper 7, which will be described later. When the light-blocking sheet 2 is wound up and unwound, the weight 6 prevents the lower end of the light-blocking sheet 2 from flapping and allows it to move up and down along the guide member 4, preventing the light-blocking sheet 2 from curling up. In addition, the light-blocking sheet 2 is pulled downward by the weight of the weight 6, so tension is applied to the light-blocking sheet 2, suppressing bending of the light-blocking sheet 2.

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 width direction (hereinafter simply referred to as the "width direction") along the axial direction of the winding shaft 3 of the light blocking sheet 2. The weight 6 is attached to the lower end of the light blocking sheet 2 with the center of the width direction of the light blocking sheet 2 aligned with the center of the axial direction of the weight 6. Then, the load of the weight 6 is applied evenly to the light blocking sheet 2, so that the upper and lower positions of the lower end of the light blocking sheet 2 are the same in the width direction. Therefore, when the light blocking sheet 2 is wound up, the light blocking sheet 2 can be wound up evenly in the axial direction around the winding shaft 3.

The weight 6 is not particularly limited in diameter, material, or shape, so long as it is a rod-like shape whose cross-sectional shape does not change in the axial direction; for example, the weight 6 may be solid. However, if the weight of the weight 6 is too heavy, the force pulling the light-blocking sheet 2 downward will be large, which may cause deterioration of the light-blocking sheet 2 or require an increase in the output of the drive unit 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 light-blocking sheet 2 that is sufficient to prevent the light-blocking sheet 2 from curling up while suppressing bending of the light-blocking sheet 2.

If the load of the weight 6 does not have to be uniformly applied to the light-shielding sheet 2, the weight 6 does not have to be rod-shaped; for example, multiple weights may be connected to the lower end of the light-shielding sheet 2 at intervals in the width direction. If the weight of the light-shielding sheet 2 can be sufficiently prevented from curling up or bending, the weight 6 may be omitted.

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 a predetermined interval along the axial direction. As shown in FIG. 6, the sheet fastening member 7 has an opening 7a that is narrower than the diameter of the weight 6, is a C-shaped cylinder with an inner diameter approximately equal to the diameter of the weight 6, and is elastic.

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, so that 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.

As shown in FIG. 3, the sheet retaining material 7 is installed in a mounting orientation with the opening 7a facing upward (opposite the guide member 4) on the portion of the weight 6 that faces the guide member 4 from above and below, and the weight 6 abuts against the guide member 4 via the sheet retaining material 7. When the light-shielding sheet 2 is wound up and unwound, the weight 6 moves as if dragged on the guide member 4, and does not roll, so the weight 6 always abuts against the guide member 4 via the sheet retaining material 7.

Therefore, even if the lower end of the light blocking sheet 2 is pressed against the guide member 4 by the weight of the weight 6, the light blocking sheet 2 does not come into direct contact with the guide member 4, so that the light blocking sheet 2 can be prevented from rubbing against the guide member 4 and deteriorating when the light blocking sheet 2 is wound up and unwound. The sheet stopper 7 can be attached to the weight 6 in any direction as long as the opening 7a does not face the guide member 4.

The number of sheet stoppers 7 may be determined appropriately depending on the required mounting strength of the weight 6, but if the sheet stoppers 7 are attached at least to two locations that are approximately equidistant from the axial center of the weight 6 and face the guide member 4, the weight 6 can be prevented from tilting.

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 can connect the weight 6 to the lower end of the light blocking sheet 2. Regardless of the configuration of the sheet fastening material, by arranging 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 deteriorating. 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 need to abut against the guide member 4.

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 at a distance from the arch portion Pb inside the arch portion Pb of the aggregate P.

As described above, the sheet winding device 1 of this embodiment is installed in a vinyl greenhouse H as a simple structure having a framework F formed by arranging multiple 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 device is equipped with a winding shaft 3 that is arranged across the aggregates P, is attached to the upper end of the shading sheet 2, is supported rotatably around the axis relative to the framework F, and is capable of winding and unwinding the shading sheet 2, a drive device that is provided at one end of the winding shaft 3 and drives the rotation of the winding shaft 3, and a guide member 4 that serves as a guide section that guides the movement of the lower end of the shading sheet 2 when winding and unwinding the shading sheet 2.

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 drive device does not act on the lower end of the shading sheet 2, 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 on the winding shaft 3.

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 by the winding shaft 3 and the shading sheet 2 inside the vinyl greenhouse H when the shading sheet 2 is stored can be minimized.

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 is rotatably installed from the outside at the top of the framework F, and the upper part of each aggregate P functions as a guide part that guides the movement of the lower end of the shading sheet 2 when winding and unwinding the shading sheet 2.

The sheet winding device 1 may also deploy or store the shading sheet 2 that covers the inside or outside of the side of the vinyl greenhouse H. In this case, the winding shaft 3 is rotatably installed on the shoulder portion, which is the boundary between the standing portion Pa and the arch portion Pb of each aggregate P, or on the upper part of the standing portion Pa, and multiple guide pipes are erected near each standing portion Pa, and the shading sheet 2 is placed between the standing portion Pa and the guide pipes. In this case, the guide pipes become guides that guide the movement of the lower end of the shading sheet 2 when it 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.

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 be a transparent opening and closing sheet that opens and closes an opening provided on the roof surface or side of the vinyl greenhouse H.

The sheet winding device 1 of this embodiment also includes a rod-shaped weight 6 that is 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 equal to or greater than 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 such that the center of the width of the shading sheet 2 coincides with the center of the axial direction of the weight 6.

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

The sheet winding device 1 of this embodiment also includes a sheet retaining member 7 that connects a 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 retaining member 7.

According to the sheet winding device 1 configured in this manner, even if the lower end of the light-blocking sheet 2 is pressed against the guide member 4 by the weight of the weight 6, the light-blocking sheet 2 does not come into direct contact with the guide member 4, so that the light-blocking sheet 2 can be prevented from rubbing against the guide member 4 and deteriorating when the light-blocking sheet 2 is wound up or unwound. However, if the light-blocking sheet 2 is sufficiently prevented from curling up or bending due to its own weight, the weight 6 may be omitted.

The sheet winding device 1 of this embodiment also includes a holder 5 that is connected to the framework F and supports the winding shaft 3 so that it can rotate about 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. A plurality of holders 5 are provided at predetermined intervals along the depth direction of the vinyl greenhouse H.

With the sheet winding device 1 configured in this way, the holder 5 can be attached to an existing vinyl greenhouse H, so that the winding shaft 3 can be supported rotatably around 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 part that supports the winding shaft 3 rotatably around its axis may be provided in advance on the framework F.

In addition, in the sheet winding device 1 of this embodiment, each holder 5 has a frame F connected to the inside of the top of the aggregate P and connected to the ridge material R arranged along the depth direction of the vinyl greenhouse H, and has a cylindrical portion 50 that houses the winding shaft 3.

Here, if the winding shaft 3 is placed horizontally to the ground, the shading sheet 2 can be wound 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 placed horizontally to the ground.

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, so it is installed horizontally to the ground. Therefore, the line passing through the center 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.

Therefore, with the sheet winding device 1 configured in this manner, the winding shaft 3 housed in the tubular portion 50 of each holder 5 is positioned horizontally relative to the ground. Therefore, when installing the sheet winding device 1 in the vinyl greenhouse H, it is easy to position the winding shaft 3 horizontally relative to the ground by using the existing ridge material R that is positioned horizontally relative to the ground. However, the holder 5 may be connected to a part of the framework F other than the ridge material R.

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 mounted at one end of the opening in the tubular portion 50, and a second roller 53 rotatably mounted at a position adjacent to the first roller 52 on the opposite side of the opening in the circumferential direction of the tubular portion 50, and the winding shaft 3 is housed in the tubular portion 50 and is supported from below between the first roller 52 and the second roller 53 so as to be rotatable about its axis.

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 wound up and unwound smoothly without resistance from the holder 5. In addition, since the first roller 52 is provided at one opening end of the tube portion 50, the first roller 52 provided on the tube portion 50 rotates when the light-blocking sheet 2 enters and leaves the tube portion 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.

In addition, 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. With the sheet winding device 1 configured in this manner, even if the light-blocking 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-blocking sheet 2 is less likely to encounter resistance from the holder 5, and deterioration of the light-blocking sheet 2 can be prevented. However, the third roller 54 may be omitted.

As shown in FIG. 5, the holder 5A may have a first roller 52A at one open end of the tube portion 50 and a second roller 53A at the other open end of the tube portion 50. In this way, the second roller 53A serves 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 still achieving the same effect as the holder 5. However, the holders 5 and 5A do not have to have rollers.

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.

The above describes in detail the preferred embodiment of the present invention, but it is understood that modifications, variations and changes can be made without departing from the scope of the claims.

Reference Signs List 1: Sheet winding device, 2: Light shielding sheet (sheet), 3: Winding shaft, 4: Guide member (guide portion), 5: Holder, 6: Weight, 7: Sheet retaining material, 50: Cylinder portion, 50a: Opening, 52, 52A: First roller, 53, 53A: Second roller, 54: Third roller, F: Frame, H: Plastic greenhouse (simple structure), M: Drive device, P: Aggregate, R: Ridge material

Claims (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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