JPH0246679Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a covering sheet opening/closing device for winding up and unwinding a flexible plastic sheet to open and close it in a greenhouse covered with a flexible plastic sheet.

<Conventional Example and Problems> When constructing this type of greenhouse, the sheet fixing band must be tightened from the outside of the covering sheet to prevent the covering sheet from being blown up or blown up by the wind. It is set up.

Therefore, the winding shaft and the portion where the covering sheet is wound into a roll are held between the frame material of the greenhouse and the sheet fixing band.

When opening a greenhouse by winding up a covering sheet on a winding shaft, it is possible to roll up the covering sheet along the winding shaft, but when unwinding and closing the covering sheet, the frame material and the sheet fixing band are used. Due to the pinching caused by the winding, the winding part does not descend and the winding shaft continues to rotate in the unwinding direction, making it impossible to close the greenhouse.

Further, if the winding portion continues to rotate in the unwinding direction without lowering the winding portion, the covering sheet will end up being rolled in the opposite direction.

Furthermore, when the covering sheet is rolled up due to the clamping force between the frame material and the sheet fixing band, a considerable tensile force is applied to the covering sheet, which may cause damage.

<Means for Solving the Problems> The present invention has been proposed to eliminate the above-mentioned drawbacks, and has a configuration in which the tensile force of the sheet fixing band can be relaxed at least when the covering sheet is unwound. The object of the present invention is to provide a greenhouse covering sheet opening/closing device that can reliably open and close the greenhouse.

The above purpose is to provide a greenhouse covering sheet opening/closing device which is configured to be covered with a covering sheet made of a flexible plastic sheet and can be opened and closed by winding and unwinding the covering sheet on a winding shaft, along the opening/closing direction of the covering sheet. A sheet fixing band stretched from the outer surface of the covering sheet, a plurality of link members connecting one end of the sheet fixing band, and two parts that can run forward and backward in a direction substantially perpendicular to the opening/closing direction of the covering sheet. a traction member arranged in a pair and connecting the base end of the link member to either the forward or reverse running section;
This is achieved by a greenhouse covering sheet opening/closing device which is configured to tension or loosen the sheet fixing band by simultaneously causing the traveling portion of the traction member to travel forward and backward in opposite directions.

<Example> Next, the present invention will be explained in more detail according to an example shown in the drawings.

FIG. 1 shows an embodiment of the covering sheet opening/closing device of the present invention.

The greenhouse 1 shown here is formed in the form of a series of buildings, and its roof surface is covered with a covering sheet 2 made of a flexible plastic sheet.

Reference numeral 3 indicates a support column, and reference numeral 4 indicates a beam. A groove-shaped gutter 5 whose side surfaces are formed to substantially match the slope of the roof is disposed on the beam 4.

6... are frame members formed in an arch shape forming the roof of the greenhouse 1 and arranged at appropriate intervals parallel to the gable side; 7 are frame members arranged perpendicular to the gable side of the greenhouse; The material 6 is a through material to which it is fixed.

The covering sheet 2 is stretched to cover the outside of the frame members 6, and a winding shaft 8 for winding and unwinding the sheet is fixed to the lower edge of the covering sheet 2.

9... are sheet fixing bands arranged at appropriate intervals on the outside of the covering sheet 2 to prevent it from being blown up or blown up by the wind.

A device for changing the tensile force is provided at the end of the sheet fixing band 9.

This device is provided with a link member having one end fixed to the end of the sheet fixing band 9 and the other end fixed to the traction member 10.

On the other hand, the traction member 10 is stretched endlessly around pulleys 12, 13 and a drum 14, which are arranged on the pillars 3 or the framework of the greenhouse.

In this embodiment, a cross member 15 is disposed at the end of each sheet fixing band 9 and extends across each band 9.
One end of the link members 11 is rotatably fixed to the cross member 15.

Further, the end portions of the link members 11 on the side fixed to the traction member 10 are arranged and fixed so that the running directions of the traction member 10 are different, and the tension force of the sheet fixing band 9 is changed by the operation of the traction member. It is configured so that it can be used.

That is, when the drum 14 is rotated in the direction of the arrow in FIG. The back side of the member 10 runs in the direction of the pulley 13 and pulls the lower ends of the link members 11, 11 fixed thereto in the same direction, and the lower ends of the sheet fixing bands 9 are lowered to increase the tensile force. It will be done.

When the drum 14 is rotated in the opposite direction from this state, the link material 11 returns to its original state, and the sheet fixing band 9
The lower end of ... is raised and the tensile force is relaxed.

When winding up the covering sheet 2, the winding shaft 8 is rotated in the direction of arrow A, so that it is wound up along the covering sheet 2. However, when unwinding, the part where the covering sheet 2 is wound is Even if the covering sheet 2 is clamped between the sheet fixing band 9 and the sheet fixing band 6, the clamping force is weakened by relaxing the tensile force of the sheet fixing band 9, and the covering sheet 2 is closed by the unwinding action. can be done reliably and smoothly.

FIG. 2 shows a pair of link members 11, 11 disposed on each of the sheet fixing bands 9. In this case, link materials 11 and 1 are used, respectively.
1 is fixed to the side where the running direction of the traction member 19 is different, and the sheet fixing band 9 is arranged so as not to move in the depth direction of the greenhouse.

Further, as shown in FIG. 3, the link members 11, 11 disposed on each of the sheet fixing bands 9 apply a tensile force to the sheet fixing bands 9 when the ends fixed to the traction member 10 approach. It is preferable to configure it so that a strong tension can be applied during tensioning.

In the above embodiment, a wire or a rope is used as the traction member 10, and the traction member 10 bends when tension is applied to the seat fixing bands 9. In order to prevent this, flexure prevention members 16 are provided. They are placed at appropriate intervals.

Note that instead of the deflection prevention members 16, a guide rail, pulley, etc. may be provided to prevent the end portion of the link member 11 fixed to the traction member 10 from moving up and down.

The traction member 10 is not limited to flexible materials such as wires and ropes, but may also be made of a rigid bar, on which a rack is formed, a pinion that meshes with the rack is provided, and the pinion is driven. It may be configured so that

Further, the part on which the link material is fixed may be a rigid bar, and the part around which the pulleys 12, 13 and drum 14 shown in the first figure are wrapped may be a wire or rope.

In the above embodiment, the greenhouse is shown as a multi-building type greenhouse, but the present invention is not limited to this, and can of course be applied to a single-building type, a semi-cylindrical greenhouse, and a greenhouse. Of course, an electric type may be used as the power source.

<Effects> The present invention has the above-mentioned configuration, and the tension of the sheet fixing band can be relaxed, so when the covering sheet is opened and closed, the covering sheet can be wound up by relaxing the tensile force of the sheet fixing band. When winding up and unwinding with the shaft, the clamping force between the greenhouse frame material and the sheet fixing band is reduced, allowing smooth winding.

In particular, if the tension of the sheet fixing band is relaxed when unwinding the cover sheet, the closing operation can be carried out reliably without being pinched.

Further, when the covering sheet is wound up, if the tension of the sheet fixing band is relaxed, the tensile force applied to the covering sheet can be reduced, and there is an effect that no damage is caused.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a cross-sectional perspective view showing the main part of a greenhouse, and Fig. 2 is a main part showing another embodiment of the device for tensioning and relaxing the tension of the sheet fixing band. FIG. 3 is a side view of main parts showing still another embodiment. 1... Greenhouse, 2... Covering sheet, 3... Support,
6... Frame material, 9... Seat fixing band, 10
... Traction member, 11 ... Link material.

Claims (1)

[Scope of Claim for Utility Model Registration] A covering sheet opening/closing device for a greenhouse, which is covered with a covering sheet made of a flexible plastic sheet and can be opened and closed by winding and unwinding the covering sheet on a winding shaft: A sheet fixing band stretched from the outer surface along the opening/closing direction, a plurality of link members connecting one end of the sheet fixing band, and a forward and reverse direction in a direction substantially perpendicular to the opening/closing direction of the covering sheet. It consists of a traction member arranged in a pair of two movable pieces and connecting the base end of the link member to a running part in either forward or reverse direction, and the running part of the traction member can be moved forward or backward in opposite directions at the same time. A greenhouse covering sheet opening/closing device configured to tension or loosen a sheet fixing band by running the sheet.