JPS6121916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an emergency stop device for a roll-up sheet opening/closing device in case a trouble occurs during opening/closing operation.

In greenhouse cultivation, it is common to use heat insulating sheets for purposes such as saving on fuel costs.
A common method is to open the seat during the day and close it at night.

Currently, there are two ways to open and close thermal sheets: a pull-out type and a roll-up type. There was a problem that water puddles easily formed on the seat, making it difficult to open and close the seat. In addition, it was difficult to operate the retractable type smoothly, and the retractable type required much more labor than the retractable type.

The winding type does not have the above disadvantages, but foreign objects (sheets other than the opening/closing sheet, sheet presser bands, etc.) may hang down inside the chamber during the sheet winding operation, and the sheet may wind them up and cause the winding shaft to Transform (hereinafter referred to as "involving"). Further, during closing, due to stickiness of the sheet, the sheet becomes unable to unravel in accordance with the rotation of the winding shaft, and is reversed (hereinafter referred to as "reverse winding"). When the above-mentioned trouble occurs when opening and closing the sheet, the force relationship between the winding shaft and the opening/closing sheet causes problems such as deformation of the winding shaft and tearing of the sheet.

By the way, in manual winding operation, even if the above-mentioned opening/closing trouble occurs, it can be detected early by touch or visual inspection, and can be dealt with each time, but in the case of electric winding, once opening/closing trouble occurs, the sheet will be torn and the sheet winding will be interrupted. The shaft becomes deformed, and its repair requires a great deal of effort and expense. As described above, although the roll-up type has many advantages over the pull-out type, it is disadvantageous in dealing with opening/closing problems.

An object of the present invention is to detect an early opening/closing problem in a winding type winding type winding type winding type winding type winder and to stop the motor even if an opening/closing trouble occurs when using an electric winding type winding type winding type winding type winding type winding type winding type.

The present invention will be described below based on the drawings showing one embodiment. Reference numeral 1 denotes a sheet, one end of which is fixed to a room temperature component, and the surface is arranged to be inclined. Reference numeral 2 denotes a sheet winding shaft for winding up the sheet 1, and a driving taper drum 3 and indoor taper drums 4, 4' are fixed to one end of the shaft in close proximity with the same taper direction.

Reference numeral 5 denotes a winding rope, one end of which is wound around and fixed to a drive drum 8 fixed to the output shaft 10 of a reducer motor 9 installed in a part of the greenhouse, and the other end is fixed to the drive drum 3. The required amount is wrapped and fixed in the large diameter direction in advance so that it can be unraveled from the small diameter side. Reference numeral 6 denotes a rewinding rope, one end of which is fixed to the drive drum 8 by winding it in a required amount in advance in the opposite direction to the winding direction of the winding rope 5, and the other end is attached to an extension part in the direction of the sheet winding shaft 2. It is pulled back via a pulley 11 positioned opposite to the driving drum 8, and is wound and fixed around the driving tapered drum 3 from the small diameter side. A pulley 12 is suspended in the middle of the unwinding rope 6 wound around the drive drum 8, and the pulley 12 is pulled by a spring 13. 14 is a fixture for fixing the spring 13 to the case 17; 15 is a limit switch fixed to the case 17; when the sensing elements 16, 16' attached to the spring 13 move, the actuator of the limit switch 15 is activated; They are placed so that they are in contact with each other. 18 is an upper limit switch, and 19 is a lower limit switch.
Guide ropes 7 and 7' have one end connected to the greenhouse component and the other end wound around the guide tapered drums 4 and 4' by a required amount from the small diameter side.

When opening the sheet 1 in the above device, when the output shaft 10 of the reducer motor 9 is rotated in the direction A in the figure, the drive drum 8 attempts to pull the winding rope 5 in the direction of the arrow. On the other hand, the guide ropes 7, 7' are wound around the guide tapered drums 434' in the required amount in advance, and one end of the guide ropes 7, 7' is fixed inside the greenhouse, so that the guide ropes 7, 7' can be unwound from the guide tapered drums 434'. There must be. The guide ropes 7, 7' are pre-wound so that they unravel when the take-up rope 5 is pulled in the direction of the arrow. Therefore, when the output shaft 10 of the reducer motor 9 rotates in the direction A, the sheet winding shaft 2 rotates in the direction B, moves toward the drive drum 8 while winding up the sheet 1, and comes into contact with the upper limit switch 18. and stop.

If a worm reducer is adopted as the reducer motor 9, it will become self-locked and will not move due to external force.

Next, when closing the seat 1, the reducer motor 9
When the output shaft 10 is rotated in the opposite direction to the direction A, the take-up rope 5 is loosened, and the sheet take-up shaft 2 tends to roll down along the inclined surface (indicated by the dashed line). At this time, the winding rope 5 and the guide ropes 7, 7' are each connected to the driving tapered drum 3.
Then, it is wound up again around the guiding tapered drums 4, 4'. At this time, if the slope of the slope is small or the slope is distorted, the unwinding rope 6 is used because the component that tends to roll down the sheet winding shaft 2 is small. When the sheet 1 is opened, the unwinding rope 6 is unwound from the driving drum 8 in advance, and the unwound rope is wound up from the small diameter side of the driving tapered drum 3 via a pulley 11. When closing sheet 1,
When the drive drum 8 is rotated in the opposite direction to the A direction, the unwinding rope 6 is wound around the drive drum 8 and the pulley 11
attempts to pull the driving tapered drum 3 in the opposite direction via the .

On the other hand, since the sheet 1 is wound around the sheet winding shaft 2, the sheet 1 cannot be moved unless it is unwound. Therefore, the sheet take-up shaft 2 is forced to rotate and move so that the sheet 1 is unwound. The unwinding rope 6 has a pulley 1 on the way.
2 is inserted and biased by a spring 13 to constantly apply a tension load to the unwinding rope 6, which serves to adjust the elongation of the winding rope 5 and the unwinding rope 6. A more important feature is that this spring 13 stretches when reversely wound.

As explained above, when closing sheet 1,
Since there is a component in which the sheet winding shaft 2 tends to roll down, the force assisted by the unwinding rope 6 only needs to be small. Therefore, the tension load on the spring 13 is very small and does not interfere with normal opening/closing operations. If the sheet 1 winds backwards when closing, the unraveled sheet 1 will be wound up again and the sheet winding shaft 2 will go up again along the slope, and at this time the force applied to the unwinding rope 6 will be excessive. Therefore, an excessive force is applied to the spring 13, causing the spring 13 to be stretched.

If the sensor 16 is moved downward and comes into contact with the limit switch 15 when the spring 13 is abnormally stretched, the limit switch 15 is activated and the reducer motor 9 is stopped, thereby completing an emergency stop in the event of reverse winding. .

On the other hand, if a trouble occurs in the sheet 1 due to foreign matter when the sheet is opened, the take-up shaft 2 is prevented from rotating in the B direction, but the drive drum 8 is forced to rotate in the A direction.

At this time, since the winding shaft 2 cannot rotate, the winding rope 5 is pulled with an abnormal force, causing the unwinding rope 6 to become loose. When this slackness is transmitted to the spring 13, the spring 13 is about to contract.

As the spring 13 contracts abnormally, the sensing element 16' also moves upward and when it comes into contact with the limit switch 15, the limit switch 15 is activated and the reducer motor 9 is configured to stop, thereby completing an emergency stop in the event of entrapment. Ru.

Although the configuration has been described so far using two sensing bodies as an example, if one sensing body is brought into contact with the limit switch 15 at all times and an abnormality of reverse winding or winding occurs, the sensing body will move. A configuration is also possible in which the limit switch 15 is operated and the speed reducer motor 9 is stopped by being disconnected from the limit switch 15.

As described above, the present invention can provide emergency stops for "rolling" and "reverse winding", which have been considered drawbacks in the electrification of retractable sheets, with a compact configuration and at a low cost, and also enables reliable operation. This is extremely effective in promoting the electrification of retractable sheet opening/closing devices.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall configuration of a seat opening/closing device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the case of the emergency stop device to explain its installation. DESCRIPTION OF SYMBOLS 1... Sheet, 2... Sheet winding shaft, 3... Tapered drum for drive, 4, 4'... Tapered drum for guide, 5... Winding rope, 6... Rewinding rope, 7, 7' ... Guide rope, 8 ... Drum for drive, 9 ... Reduction gear motor, 10 ... Output shaft, 11
...pulley, 12...pulley, 13...spring,
14 Spring fixture, 15... Limit switch, 16, 16'... Sensing body, 17... Case,
18... Upper limit switch, 19... Lower limit switch.

Claims (1)

[Claims] 1. A sheet arranged in an inclined manner, a sheet winding shaft for winding up the sheet from the lower end, a driving tapered drum fixed to the sheet winding shaft, a reducer motor, and the reducer motor. One end is wound around and fixed to a driving drum to be driven and the driving tapered drum from a small diameter side to a large diameter side,
The other end of the drive rope is wound around and fixed on the drive drum, one end is wound around and fixed on the drive tapered drum from the small side to the large diameter side, and in the opposite direction of the drive rope, and the other end is driven on the drive drum. Equipped with an unwinding rope that is wound in the opposite direction of the rope and fixed,
A spring is suspended in the middle of the unwinding rope, and a sensing body is provided on the spring to detect changes in expansion and contraction of the rope, and a limit switch is provided that stops the speed reducer motor when the sensing body comes into contact with the spring. Seat opening/closing device.