JPH0140939Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting/lowering stopping device for a roll screen.

Conventionally, roll screens have a torsion spring that always works in the direction of rolling up the raw cloth on the raw cloth winding cylinder that winds up the raw cloth, and when the raw cloth is pulled down, the cloth is rolled up by a ratchet that uses centrifugal force. When stopping at a desired position and pulling up the raw cloth, the ratchet is released by pulling the raw cloth slightly, and the raw cloth is wound up into a cylinder by the action of the above-mentioned torsion spring. .

However, in such a conventional roll screen lifting/lowering stop device, it is troublesome to stop the raw cloth at a desired position, and it is difficult to stop the cloth at a desired height.

The present invention provides a lifting/lowering stop device for the roll screen that can reliably stop the raw fabric on the roll screen at a desired position by using a simple switching device instead of the above-mentioned ratchet in the conventional roll screen. This is what we are trying to provide.

The roll screen lifting/lowering stop device according to the present invention is capable of stopping a raw cloth winding cylinder body equipped with a torsion spring that always acts in the direction of winding up the roll screen raw cloth at a desired position against the force of the torsion spring. A roll screen lifting/lowering stop device that stops the raw cloth at a desired height by means of a switching cylinder and a guide drum coaxially and rotatably assembled therein at one end of the raw cloth winding cylinder. A switching device is arranged, one of the switching cylinder and the guide drum is coaxially connected to one end of the raw cloth winding cylinder, and the other is connected to a bearing part that supports the end of the winding cylinder, It is installed so that it can rotate only in the direction of pulling down the raw cloth, and the above switching tube has a
A switching pin support cylinder having a switching pin protruding radially inward is combined with the switching cylinder so that it is fixed in the rotational direction and movable in the axial direction, and is also slidable in the axial direction with respect to the guide drum. A guide sleeve is provided which is forced onto the end surface of the guide drum by a spring, and a guide groove for guiding the switching pin is provided on the circumferential surface of the guide drum adjacent to the guide sleeve, the guide groove consisting of a recess and a guide protrusion disposed in the recess. The guide groove is formed between the guide protrusion and the guide sleeve, and when the cloth winding cylinder is rotated in the cloth winding direction by the action of the torsion spring, the switching pin The guide sleeve is slid in the axial direction against the action of the spring and freely passes through the free groove, and when the cloth winding cylinder is rotated in the direction of pulling down the cloth, the switching pin is moved away from the guide sleeve. An entrance groove part that guides the material in the direction of separation, a first abutment part that the switching pin abuts at the end thereof, and a raw cloth winding cylinder rotates in the raw cloth pulling direction after abutting against the first abutment part. an outlet groove into which the switching pin is introduced when the switching pin is introduced; a second abutting part with which the switching pin collides at its end; It is characterized by comprising a protruding groove portion from which the pin escapes from the second abutting portion to the free groove portion.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a roll screen equipped with the device of the present invention. In the figure, 1 is a roll screen raw cloth, 2 is a winding cylinder for winding up the raw cloth, 3 is a torsion spring that always works to rotate the cylinder in the direction of rolling up the raw cloth, and 4 is a support for the cylinder. 5 is the bearing portion of the bracket. An elevating and lowering stop device 6 according to the present invention is provided at one end of the winding cylinder 2.

The lifting/lowering stop device 6 is constituted by a switching device comprising a switching tube 7 and a guide drum 8 coaxially and rotatably assembled therein. One of the switching cylinder 7 and the guide drum 8 is coaxially connected to one end of the raw cloth winding cylinder, and the other is mounted on the bearing part 5 so that it can rotate only in the raw cloth pulling direction. In the illustrated embodiment, the guide drum 8 is connected within one end of the raw cloth winding cylinder 2, and the switching cylinder 7 is arranged between the circumferential surface of the drum 9 fixed to its shaft and the inner surface of the bearing part 5. It is attached to the bearing part 5 so that it can rotate only in the direction of pulling down the cloth by the action of a well-known one-way clutch spring 10 disposed therebetween.

A switching pin support cylinder 12 having a switching pin 11 protruding radially inward is combined with the switching cylinder 7, which is fixed in the rotational direction and movable in the axial direction with respect to the switching cylinder. In the illustrated device, switching pin 1
1 is slidably engaged in an axial groove 13 provided in the switching barrel 7, so that when the switching barrel 7 is rotated, the switching pin support barrel 12 rotates together with the switching barrel 7.
Therefore, the switching pin 11 itself also rotates around the axis of the guide drum 8, and the switching pin 11 is slidable in the axial direction with respect to the switching cylinder 7. However,
A compression spring 14 is disposed between the switching pin support tube 12 and the enlarged diameter portion of the guide drum 8 in order to always elastically bias the switching pin 11 in one direction, that is, in the case shown, to the left. .

A guide groove 15 that engages with the switching pin is formed on the circumferential surface of the guide drum. As this guide groove, first, there is a free groove portion 15a through which the switching pin 11 can freely pass when the raw cloth winding cylinder 2 is rotated in the cloth pulling direction by the action of the torsion spring 3 mentioned above. This free groove portion 15a
In order to form a
A compression spring 18 is arranged between the ring 17 fixed to the end of the guide drum 8 and the guide sleeve 16 in order to press elastically against the end of the guide drum 8 .

To explain the above guide groove in an easy-to-understand manner,
The state in which the guide groove of the guide drum 8 is expanded is shown in the second figure.
As shown in the figure. The guide sleeve 16 has a guide surface 16.
a is formed, and a free groove 15a is formed between the free groove 15a and the guide surface 8a provided on the guide drum 8, and the guide pin 11 is engaged in the free groove 15a. An inclined surface 8c is formed on the protrusion 8b provided on the guide drum 8, and the protrusion portion 8d is pressed against the guide surface 16a of the guide sleeve 16 by the action of the spring 18. When the take-up cylinder rotates in the cloth pulling direction, the guide pin 11 moves in the direction of arrow A in FIG. 2, and the guide sleeve 1
6 and the inclined surface 8c of the protrusion 8b, the guide sleeve 16 is pushed up against the action of the spring 18, and passes freely between them. Therefore, when the raw cloth winding cylinder rotates in the raw cloth pulling direction, the guide pin 11 freely passes through the free groove portion 15a, and the rotation of the raw cloth winding cylinder is not restricted.

Next, when the raw cloth winding cylinder 2 is rotated in the raw cloth pulling direction, the switching pin 11 is moved in the opposite direction against the elastic biasing force of the spring 14, as shown in the figure, as the guide groove. There is an entrance groove portion 15b that guides in the right direction. This entrance groove 1
5b is formed on one side of the above-mentioned protrusion 8b, and by rotation of the raw cloth winding cylinder 2 in the direction of pulling down the raw cloth,
When the switching pin 11 moves from the position indicated by 11' in the direction indicated by the arrow B, the switching pin enters the entry groove 15b against the action of the spring 14. At the end of it,
A first abutting portion 15c is formed, and the switching pin 11 is stopped at this position. Here, if the raw cloth winding cylinder 2 continues to rotate in the raw cloth pulling direction, the guide drum 8 rotates and the switching cylinder 7
It also rotates. This rotation of the switching tube 7 in the cloth lowering direction is allowed by the action of the one-way clutch spring 10, so the cloth winding cylinder 2 can rotate until the cloth is pulled down to a desired height.

Further, as the guide groove described above, after the switching pin 11 hits the first abutting portion 15c as described above, the pulling down of the raw cloth is stopped and the raw cloth winding cylinder 2 is moved in the raw cloth pulling direction. There is an outlet groove portion 15d into which the switching pin 11 is guided by the elastic biasing force of the spring 14 when the switching pin 11 is rotated.
This outlet groove 15d is formed on the opposite side of the protrusion 8b, and since the switching pin 11 is pushed upward in FIG. 2 by the action of the spring 14, when the raw cloth is stopped being pulled down, the switching pin 11 This groove 15d
Go inside. A second abutting portion 15 is provided at the end of this groove.
e is formed, the switching pin 11 is stopped at this position, and the lifting of the raw cloth by the torsion spring 3 is stopped.

Finally, as the guide groove, when the cloth winding cylinder 2 is rotated in the direction of pulling down the cloth, the switching pin 11 is moved away from the second abutting portion 15e by the elastic biasing force of the spring 14. There is an escape groove 15f that escapes into the free groove 15a.
That is, by pulling the raw cloth stopped at a desired height as described above, the switching pin 11 enters the free groove portion 15a, and from then on, the raw cloth winding cylinder body is moved by the action of the torsion spring 3. Rotate freely and roll up the raw cloth.

In the above device, when pulling down the roll screen, by pulling down the raw cloth 1 by hand, the cylinder body 2 rotates in the pulling direction, and the guide drum 8 rotates accordingly, so that the switching pin 11 is rotated. It moves to the first abutment part 15c through the entrance groove part 15b, and rotates the switching cylinder 7 integrally. At this time, the one-way clutch spring 10 is loosened, so there is no problem with the rotation of the cylinder. When the cloth is stopped being pulled down, the cylindrical body is rotated in the opposite direction by the torsion spring 3, but the switching pin 11 comes to the position of the second abutting portion 15e, and the rotation of the cylindrical body is blocked, and the raw cloth is rotated as desired. It will be stopped at the position. When rolling up raw cloth, pull the raw cloth slightly and switch pin 1
1 exits from the second abutting portion 15e, is pushed by the action of the spring 11, and enters the free groove path 15a through the escape groove portion 15f. Here, the switching tube 7 cannot rotate in the cloth winding direction due to the action of the one-way clutch spring 10, but the guide drum 8 is not restrained by the switching pin 11, so the cylinder body 2 cannot rotate due to the action of the torsion spring 3. and roll up the raw cloth.

As described above, the device for stopping the lifting and lowering of a roll screen according to the present invention has a simple structure and can reliably stop the lifting and lowering of raw cloth.

In the above description, an embodiment was described in which the guide drum was connected to the raw cloth winding cylinder and the switching cylinder was connected to the bearing part via a one-way clutch device. Even if the guide drum is connected to the raw cloth winding cylinder and the guide drum is connected to the bearing part, the same effect can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a roll screen equipped with the device of the present invention, and FIG. 2 is a developed view of a guide groove in the device of the present invention. 1... raw cloth, 2... winding cylinder, 2... torsion spring, 4... bracket, 5... bearing section, 6...
Lifting stop device, 7...Switching tube, 8...Guide drum, 9...Drum, 10...One-way clutch spring, 11...Switching pin, 12...Switching pin support tube, 13...Groove, 14... Compression spring, 15... Guide groove, 16... Guide sleeve, 17... Ring, 18... Compression spring.

Claims (1)

[Scope of utility model registration request] The raw cloth is stopped at a desired height by stopping a raw cloth winding cylinder equipped with a torsion spring that always acts in the direction of winding up the raw cloth at a desired position against the force of the torsion spring. In the roll screen lifting/lowering stop device, a switching device consisting of a switching tube 7 and a guide drum 8 coaxially and rotatably assembled therein is disposed at one end of the raw cloth winding cylinder 2, and One of the switching cylinder and the guide drum is coaxially connected to one end of the raw cloth winding cylinder, and the other is connected to a bearing part 5 that supports the end of the winding cylinder so as to rotate only in the raw cloth lowering direction. A switching pin support cylinder 12 having a switching pin 11 protruding radially inward is attached to the switching cylinder so as to be fixed in the rotational direction but movable in the axial direction with respect to the switching cylinder. In combination, a guide sleeve 16 is provided which is slidable in the axial direction with respect to the guide drum 8 and is pressed against the end surface of the guide drum 8 by a spring 18, and the circumferential surface of the guide drum 8 adjacent to the guide sleeve 16 is provided. A guide groove 15 for guiding the switching pin is formed in the recess and a guide protrusion arranged in the recess, and this guide groove 15 is formed between the guide protrusion and the guide sleeve, and is used for winding raw cloth. When the cylinder is rotated in the cloth winding direction by the action of the torsion spring, the switching pin freely passes through the guide sleeve 16 while sliding in the axial direction against the action of the spring 18. a groove portion 15a, an entrance groove portion 15b that guides the switching pin 11 away from the guide sleeve 16 when the raw cloth winding tube is rotated in the raw cloth pulling direction, and a first groove portion 15b with which the switching pin collides with the end thereof. When the raw cloth winding cylinder is rotated in the raw cloth pulling direction after colliding with the abutment part 15c and the first abutment part, the switching pin is introduced into the outlet groove part 15d, and the switching pin is switched at the end thereof. The pin collides with the second abutting portion 15e, and then when the raw cloth winding cylinder is rotated in the direction of pulling down the raw cloth, the switching pin escapes from the second abutting portion to the free groove portion. A lifting/lowering stop device for a roll screen, characterized by comprising an exit groove 15f.