JPS6346224B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for attaching the upper end of a sheet to a winding cylinder rotatably supported by brackets at both ends, and winding the sheet onto the winding cylinder or unwinding the sheet from the winding cylinder. The present invention relates to a sheet winding and unwinding device that raises and lowers the sheet by lifting and lowering the sheet.

Such a device is generally used as a lifting device for a roll screen, but it can also be used for other devices, such as a lifting tape that lifts and lowers the slats of a horizontal blind, wound around a winding cylinder. It can also be used as a lifting device for horizontal blinds that lifts and lowers blind slats. However, since this sheet winding and unwinding device is widely applied to a roll screen lifting device, the roll screen will be described below.

A sheet winding and unwinding device for a roll screen generally has a built-in spring in a winding cylinder that rotates the cylinder in one direction, and when the cylinder is rotated to a desired angle, that is, When the sheet of the roll screen is unwound to a desired height, a stopping mechanism is built in to stop the winding cylinder and stop the sheet at the desired height. Various structures have been proposed as such a stopping mechanism.
A stopping mechanism such as that shown in -164973 can be advantageously used.

The roll screen with the above structure can be lowered to the desired height by pulling down the lower edge of the roll screen sheet by hand, and by releasing the hand at that position, the sheet can be lowered to the desired height. Stop at. When trying to raise the seat,
When the lower end of the sheet is slightly pulled down by hand, the stop mechanism is released, and the winding cylinder is rotated by the action of the spring built into the winding cylinder to wind up the sheet.

The present invention provides a sheet hoisting and unwinding device as described above, which is equipped with an operating wheel that is operated by an operating string, so that it is possible to perform the same lifting and lowering operations as in the prior art as described above, and to operate the operating string. However, it is an object of the present invention to provide a sheet winding and unwinding device capable of winding up and unwinding a sheet.

A feature of the present invention is that the upper end of the sheet is attached to a winding cylinder rotatably supported by brackets at both ends, and the winding cylinder is moved as desired by resisting the rotational force applied to the winding cylinder. In the sheet winding and unwinding device, the sheet winding and unwinding device has a stop mechanism built into the cylinder for stopping the rotation at a rotating position, in which a first cylinder having a protrusion protruding from the inner surface is fixed in the winding cylinder; A second cylindrical body rotatably fitted inside the protrusion is provided in the cylindrical body, and a retracted position retracted into the wall surface and a retracted position from the wall surface are provided in a slot formed in the wall surface of the second cylindrical body. A movable engager is arranged between a protruding position that protrudes and engages with the protrusion of the first cylindrical body, and the cylindrical part that is integrally formed coaxially with the operating wheel around which the operating string is wound is connected to the cylindrical part that is coaxially formed with the operating wheel around which the operating string is wound. The operation wheel is loosely fitted into the two cylinders and is rotatable left and right by a certain angle with respect to the second cylinder, and the first
A cam surface is provided on the surface of the cylindrical portion to hold the engager in the retracted position at a relative rotational position and to project the engager to the protrusion position at a second relative rotational position. and a spring is provided which always biases the operating wheel in the first relative rotational position with respect to the second cylindrical body.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a roll screen will be described with reference to the drawings.

FIG. 1 shows an embodiment of a roll screen implementing a sheet winding and unwinding device according to the present invention.
In the figure, 1 is a winding cylinder, 2 is a roll screen sheet, 3 and 4 are brackets that support the winding cylinder at both ends, and 5 is a coil spring for rotating the cylinder in one direction. . In bracket 3,
A disc 7 is attached via a bidirectional clutch spring 6, a shaft 8 is fixed to the disc 7, the coil spring 5 is connected to the shaft 8 at one end, and to the cylinder 1 at the other end, A rotational force is applied to the cylindrical body 1, and this rotational force can be adjusted by rotating the disc 7. These mechanisms are known in roll screens.

9 is a one-way clutch, 10 is a stop mechanism connected to the shaft 8 via the one-way clutch, and 11 is a brake. The stopping mechanism 10 stops the sheet at that position when the sheet 2 is pulled down to a desired height, and is released by pulling the sheet slightly downward to rotate the winding cylinder when winding up the sheet. It acts on As this stopping mechanism, various structures have been proposed in the past, but the one shown in the figure is the one shown in Utility Model Application No. 164973/1987, which was developed by the applicant of the present invention. Further, the brake 11 applies braking force to the winding cylinder when winding up the sheet, so that the sheet can be wound up slowly.

The above mechanism works by pulling down the sheet of the roll screen by hand and releasing your hand at the desired pull-down position, and the sheet will be stopped and held at that position.Also, when pulling up the sheet, the sheet can be pulled down slightly. The stopping mechanism is released and the sheet is slowly wound onto the winding cylinder, and the mechanism itself is a known one for roll screens or one previously developed by the applicant. However, it is not directly related to the present invention.

The present invention provides an operating device that controls such a sheet hoisting and unwinding device by operating an operating string. This operating device is indicated at 20 in FIG. 1, and its details are shown in FIG.

In FIG. 2, 21 is a first cylinder fixed to one end of the winding cylinder 1, and a protrusion 22 is formed on the inner surface of the first cylinder. Reference numeral 23 designates a second cylindrical body disposed within the first cylindrical body 21 so as to fit inside the protrusion 22 . A slot 24 is formed in the wall surface of the second cylindrical body 23, and a cylindrical engager 25 is inserted into the wall surface in a retracted position and protrudes from the wall surface to connect to the above-mentioned protrusion of the first cylindrical body 21. The slot 24 is movably received in the slot 24 between the protrusion and the retraction engaging the protrusion 22 . Reference numeral 26 denotes an operating wheel around which an operating string 27 (see FIG. 1) is wound. A cylindrical portion 28 is formed coaxially with the operating wheel 26, and this cylindrical portion 28 is loosely fitted into the second cylindrical body 23. be done. The operating wheel 26 is rotatable left and right by a certain angle with respect to the second cylindrical body 23. For this purpose, an arc-shaped slot 29 is formed in the operating wheel 26, and a protrusion 30 formed on the second cylinder 23 is engaged in the slot 29 so as to be movable within a certain angle.

The relative rotational positions of the operating wheel 26 and the second cylindrical body 23 are shown in FIGS. 3A and 3B. In Figure 3, in order to make it easier to understand the relationship between each part,
Only the operating wheel 26 is shown enlarged. FIG. 3A shows the first case in which the operation wheel 26 is rotated to the right by the above-mentioned constant angle with respect to the second cylindrical body 23.
FIG. 3(b) shows a second relative rotational position in which the operating wheel 26 is rotated to the left by the above-mentioned constant angle with respect to the second cylinder 23. Thus, the engaging element 25 is held in the retracted position (shown in FIG. 3A) at the first relative rotational position, and the engaging element 25 is projected to the extended position at the second relative rotational position. The working cam surface 31 is the above-mentioned cylindrical part 2
Formed at 8. However, the above operation wheel 2
A spring 32 is disposed between the second cylindrical body 23 and the second cylindrical body 23 to always bias the two toward the first relative rotational position.

The second cylindrical body 23 has a rectangular extension portion 23a.
A cylindrical body 33 is formed and engages with this square extension.
A spring 34 is housed inside. This spring 34 acts to store energy when the operating wheel 26 is rotated by the operating string 27, and to return the operating wheel 26 to its original position when the operating wheel 26 is stopped being operated.
These parts are joined together by a shaft 35 and a lid 36 attached to its end.

The operation of the above device is as follows. It is assumed that the sheet 2 of the roll screen is completely wound around the winding cylinder 1. At this time, the operating position is
It is located in the position shown in Figure A. When lowering the roll screen sheet 2, pull the operating string 27 downward.
As a result, the operating wheel 26 rotates counterclockwise, and the relative positions of the operating wheel 26, the cylindrical portion 28, and the second cylindrical body 23 become as shown in FIG. 3B. In this state, the engager 25 is attached to the cylindrical portion 28.
is pushed out to the protruding position by the convex portion of the cam surface on the surface of the cylinder, and engages with the protrusion 22 of the first cylinder 23, whereby the first cylinder 21 and the second cylinder 23 are in a locked state, and the operation wheel As the second cylinder 23 and the first cylinder 21 rotate together, the winding cylinder 1 is rotated and the sheet 2 is unwinded. At this time, the spring 34 inside the cylindrical body 33 is wound and stores energy. When the operating string 27 is fully pulled out from the operating wheel 26, by releasing the operating string 27, the operating wheel 27 is reversed by the action of the spring 34 and returns to its original position. At this time, the winding cylinder 1 is stopped at the rotational position by the above-mentioned stopping mechanism. By further pulling the operating string 27, the operating wheel is rotated again to unwind the sheet. In this way, by repeating the reciprocating movement of the operating string 27, the sheet can be lowered to a desired position.

The above mechanism can be directly applied to the winding and unwinding of the lifting tape in a horizontal blind which is configured to be raised and lowered by winding the lifting tape around the winding cylinder to raise and lower the slats of the horizontal blind.

The embodiment shown in FIG. 1 shows a roll screen in which a spring for rotating the cylinder is built into the winding cylinder, and the sheet is unwinded against the action of the spring. However, on the contrary, the sheet is unwound by its own weight without a built-in spring inside the winding cylinder, and the sheet is wound by rotating the winding cylinder with an operating string. It can also be applied to a roll screen configured to be rolled up onto a pick-up cylinder. Such an embodiment is shown in FIG.

This embodiment has the advantage that instead of rotating the winding cylinder 1 in one direction by the coil spring 5 shown in FIG. 1, the cylinder is rotated in one direction by the weight of the sheet itself. Except for this, it is exactly the same as that shown in FIG. 1, so corresponding parts are simply designated by the same reference numerals, and detailed explanation thereof will be omitted.

As explained above, the present invention provides a sheet lifting device that winds up and unwinds a sheet by pulling the edge of the sheet, as conventionally used for roll screens. To provide a sheet hoisting and unwinding device which is extremely convenient in practice, with the addition of an operating mechanism and the ability to wind up or unwind a sheet by repeatedly reciprocating up and down motions of an operating string. It is something.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of a roll screen embodying the present invention, Fig. 2 is an exploded perspective view showing an operating device for the roll screen shown in Fig. 1, and Figs. FIG. 2 is an explanatory view for explaining the operation of the operating device, and FIG. 4 is a sectional view showing another embodiment of the roll screen. 1... Winding cylinder, 2... Sheet, 3, 4...
Bracket, 5... Coil spring, 6... Bidirectional clutch spring, 7... Disc, 8... Shaft, 9...
...One-way clutch, 10...Stopping mechanism, 11...
Brake, 20... Operating device, 21... First cylindrical body, 22... Projection, 23... Second cylindrical body, 24...
Slot hole, 25... Engagement element, 26... Operation wheel,
27... Operating string, 28... Cylindrical portion, 29... Slot, 30... Protrusion, 31... Cam surface, 32... Spring, 33... Cylindrical body, 34... Spring,
35...shaft, 36...lid body.

Claims (1)

[Claims] 1 Attach the upper end of the sheet to a winding cylinder rotatably supported by brackets at both ends,
In a sheet winding and unwinding device that includes a stop mechanism built into the cylinder to stop the winding cylinder at a desired rotational position against the rotational force applied to the winding cylinder, , a first cylindrical body having a protrusion protruding from the inner surface is fixed, and inside the first cylindrical body,
A second cylindrical body rotatably fitted inside the protrusion is provided, and the second cylindrical body has a retracted position retracted into the wall surface and a retracted position protruding from the wall surface in a slot formed in the wall surface of the second cylindrical body. A movable engager is arranged between the protruding position that engages with the protrusion of the first cylindrical body, and a cylindrical part coaxially formed integrally with the operating wheel around which the operating string is wound is placed inside the second cylindrical body. The operating wheel is loosely fitted and is rotatable left and right by a certain angle with respect to the second cylinder, and the engaging element is held in the retracted position at the first relative rotational position, and the second A cam surface is formed on the surface of the cylindrical portion to cause the engager to protrude to the protruding position in the relative rotation position, and the operating wheel is always held in the above position with respect to the second cylindrical body. A sheet hoisting and unwinding device comprising a spring biasing the sheet to a first relative rotational position.