JPH0356640Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention involves winding raw cloth onto a winding pipe,
It also relates to a roll screen that raises and lowers the raw cloth by unwinding it.In particular, when unrolling the raw cloth on the roll screen, the rotation of the winding pipe is controlled when the raw cloth is completely unrolled. This invention relates to a raw cloth reverse winding prevention device that stops and prevents raw cloth from winding backwards.

In the roll screen of the above type, when unrolling the raw cloth on the roll screen, if the winding pipe continues to rotate after the raw cloth is completely unrolled, the raw cloth will be rolled up in the opposite direction. This causes the winding to become disordered. Recently, a spring has been installed that always rotates the winding pipe in the cloth winding direction, and a clutch pawl is used to stop the winding pipe at a desired position against the force of the spring. Spring drive type roll screens have become widely used, but in this type of roll screen, the raw fabric is completely unrolled when it is taken down. If the clutch is wound backwards, the clutch cannot be released and the cloth cannot be raised or lowered (so-called ``hikiri'').
The number of claims based on such "cutoffs" is increasing significantly.

The present invention aims to provide a device that can be manufactured at low cost with an extremely simple mechanism and that can effectively prevent reverse winding of raw cloth.

The feature of the device for preventing reverse winding of raw cloth on a roll screen according to the present invention is that when the raw cloth wound on the winding pipe is unwound and the raw cloth is no longer held in place by the winding pipe, A protruding stopper is provided, and a side plate supporting the take-up pipe is provided with an abutting portion that abuts against the protruding stopper to prevent rotation of the take-up pipe.

This will be explained below with reference to the drawings.

FIG. 1 shows a roll screen according to the present invention, and the illustrated roll screen 1 has a winding pipe 2 and a raw cloth 3 attached to the winding pipe at the upper end. 2
The raw cloth is raised and lowered by winding it up and unwinding it. The illustrated roll screen 1 is
The winding pipe 2 is configured to be rotated by operating the operating string 4. In the figure, 5 and 6 indicate side plates that support the winding pipe.

FIG. 2 shows an embodiment of the device for preventing reverse winding of raw cloth according to the present invention. In the figure, 7 is a stopper, which is attached to the take-up pipe 2 so that it protrudes from the take-up pipe 2 when the cloth 3 wound on the take-up pipe 2 is unwound and is no longer held in place by the cloth. ing. In the illustrated embodiment, the stopper 7 is pivoted by a pin 8 at an eccentric position at the end of the winding pipe 2, so that when the raw cloth 3 is wound onto the winding pipe 2, it is held down by the raw cloth. It is then stored in the winding pipe 2. Reference numeral 9 denotes an abutment portion provided on the side plate 5, and this abutment portion 9 abuts against the stopper 7 when the stopper 7 protrudes from the take-up pipe to prevent rotation of the take-up pipe 2. It is arranged like this.

The operation of the above device will be explained with reference to FIG. When the raw cloth 3 is wound around the winding pipe 2, the stopper 7 is held in the winding pipe 2 while being held down by the raw cloth 3, as shown in FIG. 2A. When the take-up pipe 2 is rotated in the direction in which the raw cloth 3 is unloaded and the raw cloth 3 is unraveled from the take-up pipe 2 and is no longer restrained by the raw cloth, the stopper 7 causes the winding to take place as shown in FIG. 3B. It protrudes from the take pipe 2. In the illustrated example, the stopper 7 is arranged so as to protrude due to its own weight, but for example, a spring acting on the stopper may be provided so that the stopper 7 protrudes elastically. The stopper 7 that protrudes in this way hits the abutting portion 9, and the rotation of the winding pipe 2 is actively stopped.

As mentioned above, the present invention is a mechanism that is extremely simple and inexpensive to manufacture, yet can reliably prevent the reverse winding of raw cloth, especially in the type of roll screen manufactured using an operating string as described above. To provide an effective device for preventing reverse winding of raw cloth. According to the present invention, unwinding of the raw cloth onto the winding pipe is stopped at the lowest position of the raw cloth, and reverse winding of the raw cloth can be prevented, so even when raw cloths with different front, back, and patterns are used, There is no chance of accidentally using the front or back side backwards, and it prevents the fabric from being rolled in the wrong direction, so the fabric can always be rolled up in the same condition. Disturbance can be prevented. Furthermore, since the final operation position for winding and unwinding the cloth is automatically determined, no undue force is applied to the mechanism, allowing the main body to be used for a long time.

[Brief explanation of drawings]

FIG. 1 is a front view of a roll screen equipped with a device for preventing reverse winding of raw cloth according to the present invention, and FIG. 2 is a partial cross-sectional view of a part of the roll screen shown in FIG. 1, showing an embodiment of the present invention. FIGS. 3A, 3B, and 3C are diagrams for explaining the operation of the device of the present invention. 1... Roll screen, 2... Winding pipe, 3... Raw cloth, 4... Operation string, 5, 6... Side plate, 7... Stopper, 8... Pin, 9...
...Contact part.

Claims (1)

[Scope of utility model registration request] In a roll screen that raises and lowers the raw cloth by winding it up or unrolling it around a winding pipe, the raw cloth that has been wound on the winding pipe is unwound and the raw cloth is rolled up and down. A stopper is provided that projects from the take-up pipe when the restraint is lost, and a side plate that supports the take-up pipe is provided with an impact portion that abuts against the protruding stopper to prevent rotation of the take-up pipe. A device for preventing reverse winding of raw cloth for a roll screen, characterized by being provided with.