Sheet opening / closing device

Abstract

To provide a sheet opening / closing device that can restrict rotation of a body of a driving source without using a guide roller when driving the driving source.SOLUTION: Means for solving the problem is a sheet opening / closing device 1 that has: a sheet 2 which covers opening parts O provided for a plastic greenhouse H; a take-up shaft 3 which is attached to one end of the sheet 2 and capable of taking up and dispensing the sheet 2; and a driving source 4 which is attached to one end of the take-up shaft 3 and drives the take-up shaft 3 in a rotating manner, and opens / closes the opening parts O, where the device 1 comprises: a gable side frame material PG as a guide part which extends along a moving direction of the take-up shaft 3; and a rotation stopping member 6 having an abutting part 60 which is connected to the driving source 4 and abuts to the gable side frame material PG at a position deviated in a radial direction from an axis R of the take-up shaft 3 when the axis R is seen from an axial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a seat opening / closing device. [Background technology]

[0002] Simple structures such as vinyl greenhouses, greenhouses, and simple warehouses may be equipped with a sheet opening and closing device that opens and closes ventilation openings on the sides or roof of the simple structure with a sheet to provide ventilation.

[0003] Such a sheet opening and closing device, for example, includes a sheet whose upper end is attached above an opening provided in the side of a simple structure, a winding shaft attached to the lower end of the sheet and capable of winding and unwinding the sheet, a drive source attached to one end of the winding shaft that protrudes from the end surface of the simple structure when viewed from the side of the simple structure and drives the winding shaft to rotate, and a guide mechanism that guides the up and down movement of the drive source while regulating the rotation of the main body of the drive source when the drive source is operating (for example, Patent Document 1).

[0004] Specifically, the guide mechanism includes a guide pillar that rises up and down from the ground and faces one end of the winding shaft at the front and rear when viewed from the side of the simple structure, and a guide roller that is connected to a drive source and has a number of rollers arranged to sandwich the guide pillar.

[0005] Since the guide roller has a plurality of rollers sandwiching the guide pillar, it can run on the guide pillar to guide the vertical movement of the drive source while restricting the rotation of the main body of the drive source when the drive source is driven. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-34443 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the guide rollers are prone to problems such as deformation due to aging or foreign objects becoming caught between the rollers and the rotating shaft, preventing the rollers from running along the guide posts and making it impossible to open or close the opening.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a seat opening / closing device that can regulate the rotation of the main body of the drive source when the drive source is driven, without using a guide roller. [Means for solving the problem]

[0009] In order to achieve the above object, the sheet opening and closing device of the present invention has a sheet that covers an opening provided in a simple structure, a winding shaft attached to one end of the sheet to be able to wind and unwind the sheet, and a drive source attached to one end of the winding shaft to rotate and drive the winding shaft, and is characterized in that it includes a guide portion extending along the movement direction of the winding shaft, and a rotation prevention member connected to the drive source and having an abutment portion that abuts against the guide portion at a position radially displaced from the axis of the winding shaft when viewed from the axial direction. With this configuration, even if the main body of the drive source tries to rotate in the opposite direction to the drive direction when the drive source is driven, the abutment portion connected to the drive source abuts against the end side frame, so that the rotation of the main body of the drive source is restricted.

[0010] In addition, in the sheet opening and closing device of the present invention, the simple structure includes a plurality of arch-shaped or mountain-shaped frameworks arranged in a line in the depth direction, and openings are provided in the sides or roof of the simple structure, and the frameworks may serve as guide parts. With this configuration, the framework of the simple structure serves as a guide part that guides the movement of the winding shaft, so that there is no need to provide a separate guide part when installing the sheet opening and closing device on the simple structure. This reduces the number of parts in the sheet opening and closing device, and makes it easier to install the sheet opening and closing device.

[0011] In the seat opening and closing device of the present invention, the anti-rotation member may have a holding portion provided on the opposite side of the contact portion to the drive source and holding the winding shaft rotatably. According to this configuration, since both ends of the contact portion are supported by the drive source and the winding shaft with the guide portion between them, when the contact portion contacts the guide portion to restrict the rotation of the main body of the drive source, it is possible to prevent the contact portion from shaking due to the reaction force received from the guide portion and causing the seat opening and closing device to wobble.

[0012] The seat opening and closing device of the present invention may further include a regulating member that is disposed on the opposite side of the winding shaft to the guide portion, extends along the moving direction of the winding shaft, and abuts against the winding shaft when the opening is opened or closed. With this configuration, even if the winding shaft tries to rise up from the guide portion with the abutment portion as a fulcrum when the abutment portion abuts against the guide portion to restrict the rotation of the main body of the drive source, the winding shaft abuts against the regulating member, so that the winding shaft is prevented from rising up.

[0013] The seat opening / closing device of the present invention may further include a rubber cover attached to either or both of the anti-rotation member and the guide portion to cover the portions where they come into contact with each other. With this configuration, it is possible to prevent deterioration of the covering sheet that covers the guide portion and generation of abnormal noise caused by the abutment portion of the anti-rotation member rubbing against the guide portion when the seat opening / closing device opens and closes the opening. Effect of the Invention

[0014] According to the seat opening and closing device of the present invention, the rotation of the main body of the drive source when the drive source is driven can be regulated without using a guide roller, so there is no problem such as a malfunction of the guide roller making it impossible to open or close the opening. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the simplified structure of the present embodiment. [Diagram 2] FIG. 2 is an enlarged side view showing a portion of the simplified structure of the present embodiment. [Diagram 3] FIG. 2 is an enlarged perspective view showing a part of the simplified structure of the present embodiment. [Figure 4]FIG. 13 is a perspective view of another embodiment of a simplified structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present embodiment will now be described with reference to the drawings, in which like reference numerals denote like parts throughout the several views.

[0017] As shown in Figures 1 to 3, the vinyl greenhouse H, which is a simplified structure of this embodiment, is provided with a sheet opening and closing device 1 that opens and closes an opening O provided on the side to ventilate the vinyl greenhouse H and adjust the temperature inside the greenhouse.

[0018] As shown in Figure 1, the vinyl greenhouse H is configured in an arch shape and comprises a number of arch-shaped aggregates P arranged in a line along the depth direction, purlins M spanning between the tops of each aggregate P, and covering sheets S stretched over each frame F.

[0019] Specifically, the aggregate P has a pair of standing parts Pa, Pa that stand up straight from the ground when viewed from the depth direction of the vinyl greenhouse H, and an arch part Pb that is approximately arc-shaped and connects the upper ends of the standing parts Pa, Pa. 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 be configured in a mountain shape in which the arch parts Pb are inclined diagonally inward from the upper ends of the standing parts Pa and connected to each other.

[0020] Three sheet fixing frames F1, F2, F3 arranged vertically are bridged in the depth direction between the standing parts Pa of each aggregate P. The first sheet fixing frame F1, which is arranged at the top of the three sheet fixing frames F1, F2, F3, bridges between the upper ends of each standing part Pa, the second sheet fixing frame F2, which is arranged second from the top, bridges between the upper and lower ends of each standing part Pa at a position closer to the lower end than the middle position, and the third sheet fixing frame F3, which is arranged at the bottom, bridges between the lower ends of each standing part Pa.

[0021] Also, although not described in detail, each sheet fixing frame F1, F2, F3 has a groove formed with an opening width narrower than the bottom, and with the cover sheet S inserted into this groove, an elastic member (not shown) is inserted into the groove from above the cover sheet S, thereby fixing the cover sheet S to each sheet fixing frame F1, F2, F3.

[0022] In this embodiment, as shown in Fig. 1, the covering sheet S is not extended in a portion between the first sheet fixing frame F1 and the second sheet fixing frame F2, so that an opening O is formed in the side of the vinyl greenhouse H. The size of the opening O may be determined arbitrarily. Although not shown, a net is extended to fill the opening O, to prevent pests and birds from entering the vinyl greenhouse H.

[0023] 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.

[0024] 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.

[0025] Next, a sheet opening / closing device 1 that opens and closes the opening O with a sheet 2 will be described in detail. As shown in Figs. 1 and 2, the sheet opening / closing device 1 of this embodiment includes a sheet 2 whose upper end is attached to a first sheet fixing frame F1 that constitutes the upper edge of the opening O and covers the opening O, a winding shaft 3 that is attached to the lower end of the sheet 2 and can wind and unwind the sheet 2, a drive source 4 that is attached to one end of the winding shaft 3 and drives the winding shaft 3 to rotate, aggregate P (hereinafter referred to as "end-side aggregate PG") arranged on the end side of the vinyl greenhouse H as a guide extending along the up-down direction that is the moving direction of the winding shaft 3, and a rotation stopper member 6 that is connected to the drive source 4 and has an abutment portion 60 that abuts against the end-side aggregate PG at a position radially shifted from the axis R of the winding shaft 3 when viewed from the axial direction, thereby restricting the rotation of the main body of the drive source 4 when the drive source 4 is driven.

[0026] The sheet 2 has a width and a length both longer than the opening O, and its upper end is fixed via an elastic member (not shown) to a first sheet fixing frame F1 provided above the opening O, and a winding shaft 3 is attached to its lower end, which is its free end. Note that a soft sheet such as a polyolefin film such as a polyvinyl chloride film or a PET film is used for the sheet 2, but the material of the sheet 2 is not particularly limited as long as it can be wound around the winding shaft 3 and can prevent rain and wind from entering the vinyl greenhouse H.

[0027] As shown in Figures 2 and 3, the winding shaft 3 is a hollow pipe extending along the depth direction of the vinyl greenhouse H, and one end (the left end in Figure 2) protrudes from the gable surface of the vinyl greenhouse H when viewed from the side.

[0028] 2 and 3, the driving source 4 is a geared motor including a motor 40 and a gear unit 42 that accommodates a reducer that reduces the rotation speed of the motor 40 and transmits the reduced rotation speed while projecting an output shaft 41 of the reducer to the outside. A tip of the output shaft 41 is connected to one end of the winding shaft 3 via a coupling 43. Note that, although a geared motor is used as the driving source 4 in this embodiment, the driving source 4 is not particularly limited as long as it can rotate the winding shaft 3 and can move up and down together with the winding shaft 3 when opening and closing the opening O.

[0029] Although not described in detail, a belt 10 that supports the load of the drive source 4 is stretched between the portion between the point where the holding portion 62 on the winding shaft 3 is connected and the point where the lower end of the sheet 2 is connected, and the first sheet fixing frame F1, thereby preventing the load of the drive source 4 from acting on the sheet 2 via the winding shaft 3 and causing the sheet 2 to stretch.

[0030] As shown in Figures 2 and 3, the anti-rotation member 6 in this embodiment is formed in a U-shape and includes a rod-shaped abutment portion 60 that is positioned below the winding shaft 3 and opposite the upright portion Pa of the end side aggregate PG and extends parallel to the winding shaft 3, a connecting portion 61 that extends upward from the drive source 4 side end of the abutment portion 60 (left end in Figure 2) and is connected to the lower end of the gear portion 42 of the drive source 4, and a holding portion 62 that extends upward from the anti-drive source side end of the abutment portion 60 (right end in Figure 2) and holds the winding shaft 3 freely rotatable.

[0031] In addition, in the anti-rotation member 6 of this embodiment, the abutment portion 60 is connected to the drive source 4 via the connecting portion 61 and faces the upright portion Pa of the end side aggregate PG at a position radially shifted downward from the axis R of the winding shaft 3 when viewed from the axial direction.

[0032] In this embodiment, the anti-rotation member 6 is formed in a U-shape, but as long as the abutment portion 60 abuts against the upright portion Pa of the end side aggregate PG at a position radially shifted from the axis R of the winding shaft 3 when viewed in the axial direction, the shape of the anti-rotation member 6 is not particularly limited, and may be, for example, a trapezoid with the abutment portion 60 as the base.

[0033] Here, when the drive source 4 is driven to rotate the winding shaft 3 counterclockwise (in the direction of arrow A in Figure 3) to wind the sheet 2 onto the winding shaft 3 and open the opening O, a torque acts on the winding shaft 3 counterclockwise (in the direction of arrow A in Figure 3) about the axis R, but since the drive source 4 is not supported in any way, the main body of the drive source 4 tries to rotate clockwise (in the direction of arrow B in Figure 3) about the axis R in reaction to the above torque.

[0034] In this way, even if the drive source 4 attempts to rotate clockwise around the axis R due to the above-mentioned drive, the abutment portion 60 abuts against the upright portion Pa of the end side aggregate PG, restricting the clockwise rotation of the main body of the drive source 4.

[0035] Therefore, when the sheet 2 is wound up around the winding shaft 3 by the sheet opening / closing device 1, the abutment portion 60 of the anti-rotation member 6 abuts against the standing portion Pa of the end side frame PG below the winding shaft 3, restricting the rotation of the main body of the drive source 4 in the direction of arrow B in Figure 3. The winding shaft 3 moves upward while winding up the sheet 2, guided by the standing portion Pa of the end side frame PG, and when the drive source 4 is stopped when the winding shaft 3 has moved near the first sheet fixing frame F1, the opening O becomes fully open.

[0036] Conversely, a case where the sheet 2 is unwound from the winding shaft 3 by the sheet opening / closing device 1 to close the opening O will be described. A downward force due to gravity acts on the winding shaft 3, so the winding shaft 3 always tries to rotate in the direction to unwind the sheet 2. Therefore, even when the sheet 2 is unwound from the winding shaft 3, the driving source 4 is driven to give the winding shaft 3 a torque in the counterclockwise direction, which is the winding direction (the direction of the arrow A in FIG. 3), to slow down the rotation speed of the winding shaft 3 in the unwinding direction. Therefore, even when the opening O is closed, the driving source 4 tries to rotate in the clockwise direction, so that the abutment portion 60 of the rotation stopper member 6 abuts against the standing portion Pa of the end side aggregate PG below the winding shaft 3, restricting the rotation of the main body of the driving source 4, and the winding shaft 3 moves downward while being guided by the standing portion Pa of the end side aggregate PG and unwinding the sheet 2. Then, when the drive source 4 is stopped when the winding shaft 3 moves below the second sheet-fixing frame F2, the opening O is completely closed by the sheet 2. Although not described in detail, the winding shaft 3 can be stopped at any position by a brake provided on the drive source 4.

[0037] In this embodiment, the aggregate PG on the gable side of the vinyl greenhouse H is used as the guide part for guiding the movement of the winding shaft 3, but the aggregate P arranged on a side other than the gable side of the vinyl greenhouse H may be used as the guide part. Also, the guide part does not have to be the aggregate P. For example, a guide pillar that stands at a position opposite the part of the winding shaft 3 that protrudes from the gable side of the vinyl greenhouse H when viewed from the side of the vinyl greenhouse H may be embedded in the ground and used as the guide part.

[0038] However, if the end side aggregate PG of the vinyl greenhouse H is used as the guide part as in this embodiment, there is no need to provide a separate guide part when installing the sheet opening and closing device 1 in the vinyl greenhouse H. This allows the number of parts of the sheet opening and closing device 1 to be reduced and makes it easier to install the sheet opening and closing device 1. In addition, in this embodiment, since the end side aggregate PG of the vinyl greenhouse H is used as the guide part, the guide part does not interfere with the movement of equipment and people installed around the vinyl greenhouse H.

[0039] In addition, rubber covers C1, C2 are attached to the contact portions of the abutment portion 60 and the standing portion Pa of the end side aggregate PG, and each cover C1, C2 covers the contact portions of the abutment portion 60 and the standing portion Pa.

[0040] Therefore, when the seat opening / closing device 1 opens and closes the opening O with the seat 2, deterioration of the covering sheet S and generation of abnormal noise caused by the abutment portion 60 of the anti-rotation member 6 rubbing against the covering sheet S covering the end-side aggregate PG can be prevented. However, the covers C1 and C2 may be attached to only one of the abutment portion 60 of the anti-rotation member 6 and the end-side aggregate PG. Also, the covers C1 and C2 may be omitted.

[0041] The holding part 62 has a J-shaped arm 62a that curves and extends vertically upward from the right end of the abutting part 60, and a ring-shaped holder 62b that is provided at the tip of the arm 62a and holds the winding shaft 3. The diameter of the holder 62b is set to be slightly larger than the diameter of the winding shaft 3, so that the winding shaft 3 is allowed to rotate within the holder 62b. Therefore, the rotation of the winding shaft 3 is not hindered by the holding part 62. Although not shown, a bearing may be interposed between the winding shaft 3 and the holder 62b, for example, to reduce friction between the winding shaft 3 and the holder 62b.

[0042] In this way, the contact portion 60 is connected to the winding shaft 3 via the holding portion 62 and is connected to the gear portion 42 of the driving source 4 via the connecting portion 61, so that both ends of the contact portion 60 are supported by the driving source 4 and the winding shaft 3, sandwiching the end side aggregate PG between them. Therefore, when the contact portion 60 contacts the end side aggregate PG to restrict the rotation of the main body of the driving source 4, the contact portion 60 can be prevented from shaking and the seat opening and closing device 1 from wobbling due to the reaction force received from the end side aggregate PG.

[0043] However, if the torque of the driving source 4 is small or the rigidity of the abutment portion 60 and the connecting portion 61 is high, and there is no risk of the seat opening and closing device 1 wobbling due to the reaction force that the anti-rotation member 6 receives from the end side aggregate PG, the retaining portion 62 may be omitted.

[0044] Furthermore, as mentioned above, when the driving source 4 is driven to open or close the seat 2, the anti-rotation member 6 attempts to rotate clockwise, causing the winding shaft 3 to attempt to lift up from the end side aggregate PG, with the contact portion 60 as a fulcrum.

[0045] This floating of the winding shaft 3 can be suppressed to some extent by the weight of the winding shaft 3 and the driving source 4, but in this embodiment, a regulating rod 5 is provided as a regulating member to prevent the winding shaft 3 from floating up.

[0046] As shown in Figure 2, the regulating rod 5 extends in the vertical direction, which is the movement direction of the winding shaft 3, and is spanned between the first sheet fixing frame F1 and the third sheet fixing frame F3, and is positioned on the anti-gable side of the frame on the part of the winding shaft 3 on which the sheet 2 is not wound, and abuts against the winding shaft 3 when the opening O is opened or closed.

[0047] Therefore, even if the winding shaft 3 tries to rise up from the end side aggregate PG using the abutment portion 60 as a fulcrum when the abutment portion 60 abuts against the end side aggregate PG to restrict the rotation of the main body of the drive source 4, the winding shaft 3 abuts against the restricting rod 5, thereby preventing the winding shaft 3 from rising up.

[0048] Here, the longer the vertical length of the anti-rotation member 6, which is the distance between the contact portion 60 of the anti-rotation member 6 and the winding shaft 3, the smaller the force with which the winding shaft 3 tries to lift up from the end side aggregate PG, using the contact portion 60 as a fulcrum. The smaller the force with which the winding shaft 3 tries to lift up from the end side aggregate PG, the smaller the friction generated between the winding shaft 3 and the regulating rod 5. Therefore, it is preferable to have a longer vertical length of the anti-rotation member 6, since this allows the torque of the drive source 4 to be reduced.

[0049] Therefore, in this embodiment, the vertical length of the anti-rotation member 6 is set to be as long as possible within the range in which the lower end of the anti-rotation member 6 does not come into contact with the ground when the winding shaft 3 is at its lowest position. However, the vertical length of the anti-rotation member 6 can be freely set as long as the lower end of the anti-rotation member 6 does not come into contact with the ground when the winding shaft 3 is at its lowest position. The lateral length of the anti-rotation member 6 (the lateral distance between the connecting portion 61 and the holding portion 62) is not particularly limited.

[0050] Returning to the above, the regulating rod 5 includes a pipe-shaped rod body 50 and connectors 51, 52 provided at the upper and lower ends of the rod body 50, which are connectable to the first sheet fixing frame F1 and the third sheet fixing frame F3, respectively. With the rod body 50 positioned perpendicular to the winding shaft 3 on the anti-end side of the aggregate of the winding shaft 3, the upper end of the rod body 50 is connected to the first sheet fixing frame F1 via the upper connector 51, and the lower end of the rod body 50 is connected to the third sheet fixing frame F3 via the lower connector 52, so that the regulating rod 5 is positioned along the vertical direction on the anti-end side of the aggregate of the winding shaft 3.

[0051] Although not shown in detail, the connectors 51 and 52 in this embodiment include a cylindrical holder that holds the rod body 50, and a plate that is connected to the holder and can be inserted into the grooves of the seat fixing frames F1 and F3, and are connected to the seat fixing frames F1 and F3 by inserting an elastic member from above the plate inserted into the grooves of the seat fixing frames F1 and F3. However, the configuration of the connectors 51 and 52 is merely an example, and is not particularly limited as long as it is possible to connect the regulating rod 5 to the seat fixing frames F1 and F3.

[0052] In addition, in this embodiment, the regulating rod 5 is spanned between the first sheet fixing frame F1 and the third sheet fixing frame F3, but the regulating rod 5 may also be installed, for example, by burying the lower end of the regulating rod 5 in the ground and connecting the upper end of the regulating rod 5 to the upper end of the upright portion Pa of the aggregate P with a connecting fitting.

[0053] However, when the regulating rod 5 is installed by embedding it in the ground in this way, if the ground becomes muddy due to rain, the position of the lower end of the regulating member may shift, making it impossible to prevent the winding shaft 3 from floating up. In contrast, when the regulating rod 5 is connected to the first sheet fixing frame F1 and the third sheet fixing frame F3 as in this embodiment, the position of the regulating rod 5 does not change, so that the winding shaft 3 can be reliably prevented from floating up.

[0054] The above-described structure of the regulating rod 5 as the regulating member is merely an example, and the regulating member may have a shape other than a pipe shape, for example, a plate shape. In the present embodiment, the regulating rod 5 is made of metal, but the material of the regulating rod 5 is not particularly limited as long as it is not deformed or bent even when it receives a force that causes the winding shaft 3 to rise up from the end-side aggregate PG, and may be made of, for example, a synthetic resin.

[0055] In addition, since the force with which the winding shaft 3 tries to lift up from the end side aggregate PG depends on the magnitude of the torque of the drive source 4, if the torque of the drive source 4 when winding and unwinding the sheet 2 is large enough that the winding shaft 3 will not lift up and separate from the end side aggregate PG due to the weight of the winding shaft 3 and drive source 4 even without providing the regulating rod 5, the regulating rod 5 may be omitted.

[0056] In the above-described embodiment, a configuration has been described in which the opening O provided on the side of the vinyl greenhouse H is opened and closed by the sheet opening and closing device 1. However, as shown in FIG. 4, the sheet opening and closing device 1 may also open and close an opening O1 on the roof side that is provided by not spreading a covering sheet S over part of the roof surface of the vinyl greenhouse H.

[0057] In this embodiment, the roof-side opening O1 is formed by not spreading the covering sheet S over the portion facing the arch portion Pb of each aggregate P within the range between the second row of aggregate P from the front side and the second row of aggregate P from the rear side (not shown) when viewed from the depth direction. However, the range in which the roof-side opening O1 is formed in the vinyl greenhouse H is not particularly limited, and for example, the roof-side opening O1 may be formed only in a part of the range from the lower end to the top of the arch portion Pb of the aggregate P.

[0058] When opening and closing such an opening O1 on the roof side with the sheet opening and closing device 1, the sheet 2A is attached at its widthwise center to a purlin material M that is spanned between the tops of the arch portions Pb of the aggregate P via fixing metal fittings (not shown) to cover the opening O1. The fixing metal fittings are not particularly limited as long as they can attach the sheet 2A to the purlin material M. For example, the fixing metal fittings may be a frame that extends along the depth direction of the vinyl greenhouse H and has a groove formed so that the width of the opening is narrower than that of the bottom, and the frame may be fixed to the top of the purlin material M, and the sheet 2A may be attached to the purlin material M by inserting an elastic member from above the sheet 2A with the sheet 2A inserted into the groove of the frame.

[0059] Each end of the sheet 2A is provided with a sheet opening / closing device 1 that winds and unwinds the sheet 2A to open and close the opening O1. Furthermore, as shown in Fig. 4, the arch portion Pb of the end side frame PG serves as a guide portion with which the abutment portion 60 of the anti-rotation member 6 abuts.

[0060] In the sheet opening / closing device 1 installed in this manner, when the drive source 4 is driven to rotate the winding shaft 3, the abutment portion 60 of the anti-rotation member 6 abuts against the arch portion Pb of the end side aggregate PG to restrict the rotation of the main body of the drive source 4, while the winding shaft 3 rolls along the arch portion Pb of the aggregate P to wind up and pay out the sheet 2, so that the opening O1 can be opened and closed in half at a time.

[0061] In addition, in the vinyl greenhouse H of this embodiment, in order to prevent the covering sheet S from flapping in strong winds, a band 11 is provided which has elasticity and is stretched across the top of the aggregate P between the left and right first sheet fixing frames F1, F1 when viewed from the depth direction to press down the covering sheet S from above.

[0062] This band 11 is positioned above the winding shaft 3 (on the side opposite the end side aggregate) and presses the winding shaft 3 against the end side aggregate PG, and also functions as a regulating member that prevents the winding shaft 3 from floating up from the end side aggregate PG when the abutment portion 60 of the anti-rotation member 6 abuts against the arch portion Pb of the end side aggregate PG to regulate the rotation of the main body of the drive source 4.

[0063] In the sheet opening and closing device 1 that opens and closes the opening O1 provided on the roof surface of the vinyl greenhouse H, the winding shaft 3 is supported by the arch portion Pb of the aggregate P, so the aggregate P bears the load of the sheet opening and closing device 1. Therefore, the torque of the drive source 4 required to rotate the winding shaft 3 is smaller than when opening and closing the opening O provided on the side surface of the vinyl greenhouse H.

[0064] Therefore, when the anti-rotation member 6 restricts the rotation of the main body of the drive source 4, the force with which the winding shaft 3 tries to lift up from the end side aggregate PG also becomes smaller, so that even if the restricting member that prevents the winding shaft 3 from lifting up is an elastic band 11, the winding shaft 3 can be sufficiently prevented from lifting up.

[0065] In addition, when the sheet opening / closing device 1 opens and closes the opening O on the roof surface, the abutment portion 60 of the anti-rotation member 6 abuts against the arch portion Pb of the gable side aggregate PG, so that the rubber cover C1 is attached to the arch portion Pb of the gable side aggregate PG.

[0066] As described above, the sheet opening / closing device 1 of this embodiment has a sheet 2 that covers openings O, O1 provided in a vinyl greenhouse H, a winding shaft 3 attached to one end of the sheet 2 and capable of winding and unwinding the sheet 2, and a drive source 4 attached to one end of the winding shaft 3 and driving the winding shaft 3 to rotate, and is configured to open and close the openings O, O1.It is equipped with an end side aggregate PG as a guide portion extending along the movement direction of the winding shaft 3, and an anti-rotation member 6 that is connected to the drive source 4 and has an abutment portion 60 that abuts against the end side aggregate PG at a position radially shifted from the axis R of the winding shaft 3 when viewed from the axial direction.

[0067] According to the seat opening / closing device 1 configured in this manner, even if the main body of the driving source 4 attempts to rotate in the direction opposite to the driving direction when the driving source 4 is driven, the abutment portion 60 connected to the driving source 4 abuts against the end side aggregate PG, thereby restricting the rotation of the main body of the driving source 4.

[0068] Therefore, in the seat opening and closing device 1 of this embodiment, the rotation of the main body of the drive source 4 can be regulated without using guide rollers as in the conventional case, which prevents the rollers from running on the guide posts due to deformation of the guide rollers due to deterioration over time or foreign objects getting caught between the rollers and the rotating shaft, making it impossible to open and close the opening with the seat.

[0069] Furthermore, in a conventional seat opening and closing device, when the guide roller travels upward on the guide post, a force acts on the guide post trying to pull it out of the ground. Therefore, in a conventional seat opening and closing device, the guide post may come out of the ground, but the seat opening and closing device 1 of this embodiment does not have a guide roller, so there is no risk of such a problem occurring.

[0070] In addition, in the sheet opening and closing device 1 of this embodiment, the vinyl greenhouse H has a plurality of arch-shaped or mountain-shaped aggregates P arranged in a line in the depth direction, and openings O, O1 are provided in the side or roof part of the vinyl greenhouse H, and the gable side aggregate PG serves as a guide part.

[0071] According to the sheet opening and closing device 1 configured in this manner, the end side aggregate PG of the vinyl greenhouse H is used as a guide part that guides the movement of the winding shaft 3, so there is no need to provide a separate guide part when installing the sheet opening and closing device 1 in the vinyl greenhouse H. This allows the number of parts of the sheet opening and closing device 1 to be reduced and makes it easier to install the sheet opening and closing device 1. Furthermore, by using the end side aggregate PG of the vinyl greenhouse H as a guide part in this manner, the guide part does not interfere with the movement of equipment and people installed around the vinyl greenhouse H.

[0072] However, the aggregate P arranged on a side other than the gable side of the vinyl greenhouse H may be used as the guide part. Also, the guide part does not have to be the aggregate P. For example, a guide post that stands at a position opposite the part of the winding shaft 3 that protrudes from the gable side of the vinyl greenhouse H when viewed from the side of the vinyl greenhouse H may be embedded in the ground and used as the guide part.

[0073] In the seat opening and closing device 1 of this embodiment, the anti-rotation member 6 has a holding portion 62 that is provided on the side opposite the driving source of the contact portion 60 and holds the winding shaft 3 rotatably.

[0074] In the seat opening / closing device 1 configured in this manner, both ends of the abutment portion 60 are supported by the drive source 4 and the winding shaft 3, respectively, sandwiching the end side aggregate PG. Therefore, when the abutment portion 60 abuts against the end side aggregate PG to regulate the rotation of the main body of the drive source 4, the reaction force received from the end side aggregate PG prevents the abutment portion 60 from shaking and causing the seat opening / closing device 1 to wobble.

[0075] However, if the torque of the driving source 4 is small or the rigidity of the abutment portion 60 and the connecting portion 61 is high, and there is no risk of the seat opening and closing device 1 wobbling due to the reaction force that the anti-rotation member 6 receives from the end side aggregate PG, the retaining portion 62 may be omitted.

[0076] In addition, the seat opening / closing device 1 of this embodiment is equipped with a regulating member (regulating rod 5 or band 11) that is arranged on the side of the winding shaft 3 opposite the end of the frame and extends along the movement direction of the winding shaft 3 to abut against the winding shaft 3 when the openings O, O1 are opened or closed.

[0077] According to the seat opening / closing device 1 configured in this manner, when the abutment portion 60 abuts against the end side frame PG to restrict the rotation of the main body of the drive source 4, even if the winding shaft 3 tries to rise up from the end side frame PG using the abutment portion 60 as a fulcrum, the winding shaft 3 abuts against the restricting member, thereby preventing the winding shaft 3 from rising up.

[0078] Furthermore, since the force with which the winding shaft 3 tries to lift up from the end side aggregate PG depends on the magnitude of the torque of the drive source 4, if the torque of the drive source 4 when winding and unwinding the sheet 2 is large enough that the winding shaft 3 does not lift up and separate from the end side aggregate PG even without providing the regulating member 7, the regulating member 7 may be omitted.

[0079] The seat opening and closing device 1 of this embodiment also includes rubber covers C1 and C2 that are attached to both the anti-rotation member 6 and the end-side framework PG and cover the portions that come into contact with each other.

[0080] The seat opening and closing device 1 configured in this manner can prevent deterioration of the covering sheet S and generation of abnormal noise caused by the abutment portion 60 of the anti-rotation member 6 rubbing against the covering sheet S covering the end-side aggregate PG when the seat opening and closing device 1 opens and closes the opening O with the seat 2. However, the covers C1 and C2 may be attached to only one of the anti-rotation member 6 and the end-side aggregate PG. Also, the covers C1 and C2 may be omitted.

[0081] In addition, in this embodiment, a vinyl greenhouse H has been described as an example of the simple structure, but the simple structure may be a greenhouse, a simple warehouse, or the like, and is not limited to the vinyl greenhouse H. In addition, for example, the simple structure may be an interior curtain device that is installed inside the vinyl greenhouse H and includes a support member having an opening that faces the roof surface and side surface of the vinyl greenhouse H, and a curtain that covers the opening, and that can keep the temperature inside the vinyl greenhouse H warm with the curtain. In this case, the temperature inside the vinyl greenhouse H can be adjusted by winding and unwinding the curtain as a sheet 2 with the sheet opening and closing device 1.

[0082] Although the preferred embodiment of the present invention has been described in detail above, it will be understood that modifications, variations and changes can be made thereto without departing from the scope of the appended claims. [Explanation of symbols]

[0083] 1 Sheet opening / closing device, 2 Sheet, 3 Winding shaft, 4 Drive source, 5 Restricting rod (restricting member), 6 Anti-rotation member, 11 Band (restricting member) 60 Contact portion, 62 Holding portion, C1, C2 Cover, H Plastic greenhouse (simple structure), O, O1 Opening, PG End frame (guide portion), R Axis

Claims

1. A sheet opening / closing device for opening and closing the opening, the sheet opening / closing device comprising: a sheet for covering an opening provided in a simple structure; a winding shaft attached to one end of the sheet and capable of winding and unwinding the sheet; and a drive source attached to one end of the winding shaft for rotating the winding shaft, A guide portion extending along a moving direction of the winding shaft; a rotation preventing member connected to the drive source and having an abutment portion that abuts against the guide portion at a position radially shifted from the axis of the winding shaft when the axis of the winding shaft is viewed in the axial direction; A seat opening and closing device characterized by the above.

2. The simplified structure includes a plurality of arch-shaped or mountain-shaped aggregates arranged in a depth direction, The opening is provided in a side or roof of the simplified structure, The aggregate is used as the guide portion.

2. The seat opening / closing device according to claim 1.

3. The anti-rotation member has a holding portion provided on the opposite side of the contact portion to the driving source and configured to rotatably hold the winding shaft.

2. The seat opening / closing device according to claim 1.

4. a restricting member that is disposed on the opposite side of the winding shaft from the guide portion, extends along the moving direction of the winding shaft, and abuts against the winding shaft when the opening is opened or closed; 2. The seat opening / closing device according to claim 1.

5. A rubber cover is attached to either or both of the anti-rotation member and the guide portion to cover the portions where they come into contact with each other.

2. The seat opening / closing device according to claim 1.

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