JPH032123Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a device for preventing loosening of curtain opening/closing wires in greenhouses, greenhouses, etc. (hereinafter simply referred to as greenhouses, etc.).

(Prior Art) Conventionally, means for opening and closing curtains using a drive device has been widely used to adjust lighting, temperature, and humidity inside greenhouses and greenhouses. In many cases, a curtain opening/closing wire is wound in an endless ring between a driving drum installed near one end of the opening/closing curtain and a driven pulley installed near the other end. The curtains were opened and closed by fixing the opening and closing ends of the curtains to curtain opening and closing wires that moved in opposite directions.

(Problem to be solved by the invention) In such a conventional curtain opening/closing device, the curtain opening/closing wire near the drive drum is subject to droop due to various causes such as the load of the curtain, deformation of the building, and blowing up when the skylight is opened. If looseness occurred, there was a risk that the curtain opening/closing wire would come off from the drive drum and become entangled in the drive shaft, making it impossible to open/close the curtain. In particular, when the curtain opening/closing wire becomes long, the tension on the unwinding side is weaker than that on the winding side, resulting in a disadvantage that sagging or loosening tends to occur.

Japanese Utility Model Application Publication No. 57-138553 discloses a device in which tensile elasticity is imparted to the curtain opening/closing wire to eliminate sagging or loosening near the drive drum. When tensile force or slack occurs, this type of tension holding member alone cannot absorb the abnormal tension and prevent the wire from coming off.

This invention was made in view of the above points,
The purpose of this is not only to impart tensile elasticity to the curtain opening/closing wire and eliminate sag or looseness near the drive drum, but also to quickly stop the rotation of the drive drum and remove the wire from the drive drum when abnormal tension is applied. It is an object of the present invention to provide a curtain opening/closing wire loosening prevention device that prevents the curtain opening/closing wire from coming off.

(Means for Solving the Problem) According to the present invention, the middle part of the curtain opening/closing wire is wound around a driven pulley provided near one end of the curtain to be opened/closed in a greenhouse, etc., and both ends of the curtain opening/closing wire are opened/closed. The curtain is attached to a drive drum provided near the other end of the curtain by being wound in opposite directions, and the curtain opening/closing wire is wound and unwound in response to the forward and reverse rotation of the drive drum and moves in opposite directions. A curtain opening/closing device configured to open/close a curtain opening/closing device includes: a pair of guide pulleys around which the curtain opening/closing wire is wound at a predetermined interval apart from each other along the tensioning direction of the curtain opening/closing wire near the drive drum; a tension pulley that is located in the middle of the pulley and applies a predetermined tension in a direction perpendicular to the tensioning direction of the curtain opening/closing wire wound thereon; and a tension holding means that maintains the tension applied from the tension pulley at a constant level. and stop control means for detecting abnormal tension applied to the curtain opening/closing wire from the tension holding means and stopping the rotation of the drive drum. .

(Function) In the curtain opening/closing wire loosening prevention device of the present invention, the curtain opening/closing wire with the opening/closing curtain attached is not wound directly around the drive drum, but is wound around a set of guide pulleys at two locations and a tension pulley between them. It imparts tensile elasticity to the curtain opening/closing wire that is wound around the drive drum and stretched between the guide pulley and the drive drum, and when abnormal tension is applied to the wire, the drive drum can be rotated immediately. can be stopped.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In Fig. 1, 1 is a curtain opening/closing wire;
The middle part is wound around a driven pulley 2 fixed to one inner wall of the greenhouse, passed through intermediate pulleys 3a and 3b, respectively, and wrapped around pulleys 4a and 4b fixed to the other inner wall of the greenhouse to bend the drive drum. 5 and are attached by winding them in opposite directions. Therefore, when the drive drum 5 rotates counterclockwise, one wire of the curtain opening/closing wire 1 is rewound, and the other wire is wound up, and when one moves in the direction of arrow A as shown in the figure, , the other moves in the direction of arrow B, facing each other. Further, when the drive drum 5 rotates clockwise, the curtain opening/closing wire 1 moves in a direction opposite to the arrow A and a direction opposite to the arrow B, respectively.

Therefore, the opening/closing ends 6a, 7a, 8a, 9a of the opening/closing curtains 6, 7, 8, 9 are connected to the curtain opening/closing wire 1.
If the fixed ends 6b, 7b, 8b, 9b are fixed and stretched near the pulleys 4a, 4b, intermediate pulleys 3a, 3b, and driven pulley 2, respectively, then the arrows of the curtain opening/closing wire 1 As the opening/closing curtains 6, 7, 8, 9 move in the direction of arrow A and arrow B, they move in the opening direction, and conversely, as they move in the direction of arrow A and B, the opening/closing curtains 6, 7, 9 move in the opening direction. 8 and 9 will each move in the closing direction.

Here, the present invention includes a drive drum 5 and pulleys 4a, 4b.
A loosening prevention device 10 is provided for imparting tensile elasticity to the curtain opening/closing wire 1 stretched between the curtain opening and closing wires.

In the embodiment shown in FIGS. 2 to 4, the loosening prevention device 10 has a base plate 11 that is suspended and fixed to the framework of a greenhouse, etc., and a set of two rotatable locations that are spaced apart from the base board 11 by a predetermined distance. A guide pulley 12 and a tension pulley 1 that is movable along a long hole 13 provided in the base plate 11 between the guide pulleys 12 and receiving a spring force.
It consists of 4.

The tension holding means for keeping the tension applied from the tension pulley 14 constant is constructed as follows. That is, the support shaft 14a of the tension pulley 14 passes through the elongated hole 13 and is fixed to a guide plate 15 provided on the back side of the base plate 11. The guide plate 15 has the long hole 1
The guide frame 16 is supported movably along the elongated hole 13 by a pair of guide frames 16 fixed to the back side of the substrate 11 opposite to the guide frame 3 . In addition, at the lower end of the guide plate 15,
A spring mounting piece 17 is provided upright, and the spring mounting piece 1
A lower end portion of a spring mounting shaft 18 is fixed onto the spring mounting shaft 7 .
The upper end of the spring mounting shaft 18 passes through a through hole 11b of an upper frame portion 11a protruding from the back side of the upper end of the substrate 11, and is provided so as to be vertically movable. Further, a spring member 19 having a pressure-expanding elasticity is attached to the outer periphery of the spring mounting shaft 18 between the spring mounting piece 17 and the upper frame portion 11a.

The movement position of the tension pulley 14 is determined from the upper end position where the curtain opening/closing wire 1 passes through the upper surface of the guide pulley 12 in a straight line, as shown in FIG. The shaft 14a is set to move to a position where it comes into contact with the lower end of the elongated hole 13. Contact pieces 20 and 21 are fixed to the upper and lower parts of the guide plate 15 as stop control means for detecting abnormal tension applied to the curtain opening/closing wire 1 from the tension holding means and stopping the rotation of the drive drum. The tension pulley 14
At the upper end position, the lower contact piece 21 is connected to the guide frame 1.
Contact 22a of micro switch 22 fixed to 6
The upper contact piece 20 contacts the contact 22 of the micro switch 22 at the lower end position of the tension pulley 14.
It is configured so as to come into contact with a. A microswitch 22 is incorporated into the electrical circuit to actuate a stop switch for the drive motor of the drive drum.

The manner of use of the device of the present invention will be explained using an embodiment having the above-mentioned configuration.
The loosening prevention device 10 is fixed near the drive drum 5 so that the guide pulleys 12 are parallel to the tensioning direction of the curtain opening/closing wire 1 to be rewound. It is wound along the upper edge, and then the lower edge of the tension pulley 14 is brought into contact with the curtain opening/closing wire 1 in the middle of the guide pulley 12. At this time, as shown in FIGS. 2 and 3, the tension pulley 14 is given tension elasticity in the direction of arrow C by the spring elasticity of the spring member 19, so that the curtain opening/closing wire 1 does not sag or loosen. , the curtain opening/closing wire 1 receives a predetermined tensile force between the guide pulleys 12 and bends, causing the drive drum 5 to bend.
The sagging and looseness of the wire 1 being wound and unwound will be removed. In addition, when abnormal tension such as abnormal tension or slack is applied to the curtain opening/closing wire 1, the contact pieces 20 and 21 contact the contact 22a of the micro switch 22, thereby reaching the limit point of the tension and sagging. A limit point is detected and the drive drum 5 can be stopped.

In another embodiment shown in FIG. 5, a tension pulley 14 is provided at the swinging end of a guide plate 15 that swings around a fulcrum shaft 15a, and the guide plate 15 is provided with a spring elastic force having a tendency to rotate in the direction of arrow D. When the curtain opening/closing wire 1 of the drive drum becomes slack, the tension pulley 14 moves in the direction of arrow D in the middle of the guide pulley 12 to remove the slack in the wire. Reference numeral 13 denotes an arc-shaped elongated hole that guides the movement of the support shaft 14a of the tension pulley 14.

(Effect of the invention) As explained above, according to the invention, the middle part of the curtain opening/closing wire is wound around the driven pulley provided near one end of the curtain to be opened/closed in a greenhouse, etc., and both ends of the curtain opening/closing wire are The curtain opening/closing wires are wound in opposite directions and attached to drive drums provided near the other end of the curtain to be opened and closed, and are wound and rewound in response to the forward and reverse rotation of the drive drum and move in mutually opposite directions. A set of two guide pulleys used in a curtain opening/closing device configured to open and close a curtain with a curtain opening/closing device, on which the curtain opening/closing wire is wound around the curtain opening/closing wire at a predetermined interval along the tensioning direction of the curtain opening/closing wire in the vicinity of the driving drum. and a tension pulley that is located between these guide pulleys and applies a predetermined tension in a direction perpendicular to the tensioning direction of the curtain opening/closing wire wound thereon, and a tension pulley that maintains the tension applied from this tension pulley at a constant level. The present invention is equipped with a tension holding means and a stop control means for detecting abnormal tension applied from the tension holding means to the curtain opening/closing wire and stopping the rotation of the driving drum, thereby preventing sagging or loosening in the vicinity of the driving drum. In addition to removing the tension, the rotation of the drive drum is immediately stopped when abnormal tension is applied, so the curtain can be opened and closed while maintaining the predetermined tension on the drive drum more reliably than conventional systems. It is possible to provide a device for preventing loosening of a curtain opening/closing wire, which allows the wire to be wound and eliminates the risk of the wire coming off due to slack.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the outline of a greenhouse curtain opening/closing device in which the device of the present invention is used, Fig. 2 is a front view showing an embodiment of the device of the present invention, Fig. 3 is a rear view thereof, and Fig. 4 2 is a cross-sectional view taken along - in FIG. 2, and FIG. 5 is a schematic front view showing another embodiment. 1... Curtain opening/closing wire, 5... Drive drum, 12... Guide pulley, 14... Tension pulley, 15
... Information board, 19 ... Spring member.

Claims (1)

[Scope of utility model registration request] The middle part of the curtain opening/closing wire is wound around a driven pulley installed near one end of the curtain to be opened/closed in a greenhouse, etc., and both ends of the curtain opening/closing wire are reversely connected to drive drums installed near the other end of the curtain to be opened/closed. In the curtain opening/closing device, the curtain is opened and closed by the curtain opening/closing wire, which is attached by being wound in a direction, and is wound and unwound in response to the forward and reverse rotation of the drive drum and moves in mutually opposite directions. A set of two guide pulleys around which the curtain opening/closing wire is wound at a predetermined interval along the tensioning direction of the drum near the drum, and a pair of guide pulleys which are located between these guide pulleys and around which the curtain opening/closing wire is wound. a tension pulley that applies a predetermined tension in a direction orthogonal to the tensioning direction; a tension holding means that keeps the tension applied from the tension pulley constant; and an abnormality applied to the curtain opening/closing wire from the tension holding means. An apparatus for preventing loosening of a curtain opening/closing wire in a greenhouse, etc., comprising a stop control means for detecting tension and stopping rotation of the drive drum.