JPH032639Y2 - - 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 in the raw cloth winding cylinder that winds up the raw cloth, and when the raw cloth is pulled down, the raw cloth is rolled up by a ratchet that uses centrifugal force. is stopped at a desired position, and when pulling up the raw cloth, the ratchet is not released by pulling the raw cloth slightly, and the raw cloth is wound up into a cylindrical body by the action of the above-mentioned torsion spring. ing.

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. In a lifting/lowering stop device for a roll screen that stops the raw cloth at a desired height, an external frame body having a switching pin that is biased radially inward and elastically protrudes; A switching device comprising: a rotating shaft provided thereon; and a guide cylinder mounted on the rotating shaft fixedly in the circumferential direction and slidably in the axial direction and having a guide groove on the circumferential surface for receiving the above-mentioned switching pin. A clutch is disposed at one end of the raw cloth winding cylinder, and the rotation shaft is connected to the bracket of the roll screen through a one-way clutch that operates only in the raw cloth winding direction, and the clutch is connected to the roll screen bracket, and The guide groove provided on the circumferential surface of the body includes a free groove portion through which the switching pin can freely pass when the raw cloth winding cylinder is rotated in the cloth winding direction by the action of the torsion spring, and a free groove portion through which the switching pin can freely pass through. an entrance groove portion into which the switching pin is introduced when the winding cylinder is rotated in the direction of pulling down the cloth; a first abutting portion with which the switching pin abuts at the end thereof; an exit groove into which the switching pin is introduced when the raw cloth winding cylinder is rotated in the raw cloth pulling direction after hitting the raw cloth; An escape groove portion is provided through which the switching pin escapes from the second abutting portion to the free groove portion when the pick cylinder body is rotated in the direction of pulling down the raw cloth, and a connecting portion between the free groove portion and the entry groove portion. , a bottom stepped portion for regulating the moving direction of the switching pin in one direction is provided at the connecting portion between the inlet groove and the outlet groove, the connecting portion between the outlet groove and the escape groove, and the connecting portion between the escape groove and the free groove. It is characterized by:

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 and 5 are the cylinders. This is a bracket that supports A switching clutch 6 of the lifting/lowering stop device according to the present invention is provided at one end of the winding cylinder 2.

The switching clutch 6 includes a cylindrical external frame 7, a rotating shaft 8 provided at the center thereof, and a guide cylinder 9 mounted on the rotating shaft fixed in the circumferential direction but slidable in the axial direction. It is equipped with A switching pin 10 that protrudes radially inward is provided on the inner surface of the external frame 7, and this is connected to the leaf spring 1 disposed inside the external frame.
1, it is biased radially inward and elastically protrudes. Further, although the guide cylinder 9 is rotated together with the rotation shaft 8, it is slidable in the axial direction, and a guide groove 12 is formed on its circumferential surface. Guide groove 12
This will be explained in detail later.

A central shaft 13 is connected to the rotating shaft 8 so as to rotate therewith, and the outer end of the central shaft 13 is connected to the bracket 4 via a one-way clutch 14 that operates only in the cloth winding direction. Ru. This one-way clutch 14 has a helical clutch spring wrapped around the circumferential surface of the clutch drum, and when the clutch drum rotates in one direction, the clutch spring relaxes, allowing free rotation, but when the clutch drum rotates in the opposite direction. In some cases, it may be of the known type in which the clutch spring is tightened to prevent rotation of the clutch drum. In the illustrated example, this one-way clutch 14
allows the center shaft 13 and rotating shaft 8 to freely rotate when unrolling the cloth, but prevents rotation of these shafts when winding up the cloth.

The details of the guide groove 12 provided on the circumferential surface of the guide cylinder 9 are shown in a developed view in FIG.

This guide groove 12 includes a free groove portion 12a through which the switching pin 10 can freely pass when the raw cloth winding cylinder 2 is rotated in the raw cloth pulling direction by the action of the torsion spring 3, and a free groove portion 12a through which the raw cloth winding cylinder 2 can freely pass. When the pick cylinder 2 is rotated in the direction of pulling down the cloth, the switching pin 10
an entry groove portion 12b into which is introduced, and a first abutting portion 12c with which the switching pin 10 abuts at the end thereof.
When the raw cloth winding cylinder is rotated in the raw cloth pulling direction after colliding with the first punching part, the switching pin collides with the outlet groove part 12d into which the switching pin 10 is introduced at its end. Second abutment part 12
e, and an escape groove part 12f from which the switching pin 10 escapes from the second abutting part to the free groove part when the cloth winding cylinder is rotated in the cloth pulling direction.

A step is provided between the free groove part 12a and the entrance groove part 12b as shown in FIG. 4, and when the raw cloth winding cylinder 2 is rotated in the raw cloth pulling direction,
The switching pin 10 freely passes through the free groove 12a, but when the raw cloth winding cylinder 2 is rotated in the direction of pulling down the raw cloth, the switching pin 10 enters the free groove 12a due to the presence of the above-mentioned step. It is not possible to do so and enters the entry groove 12b. In addition, the entrance groove portion 12
Similarly, steps as shown in FIG. 5 are formed between the outlet groove 12d and the outlet groove 12d, between the outlet groove 12d and the escape groove 12e, and between the escape groove 12e and the free groove 12a. In other words, the groove 12
b, 12d, and 12f are configured such that their depths gradually become shallower and connect to the deepest part of the next groove portion through a step. Therefore, the switching pin 10
It moves only in the direction indicated by the arrow in the figure, not in the opposite direction. Of course, in this case, the switching pin 10
does not move in the axial direction of the switching clutch, but only moves in and out radially, and the guide cylinder 9 slides axially on the rotating shaft 8.

A brake device is attached to the rotating shaft, and the brake is activated when the fabric is rolled up, so that the winding cylinder 2 is rolled up at a constant speed.

Next, the operation of the roll screen will be explained.

First, it is assumed that the raw cloth 1 is completely wound onto the winding cylinder 2. In order to unwind the roll screen raw cloth 1, when the lower end of the raw cloth is pulled down, the winding cylinder 2 is rotated in the direction of pulling down the raw cloth. As a result, the switching clutch 6 is also rotated. As a result, the switching pin 10 rotates around the rotating shaft 8 and is guided into the entry groove 12b as described above, and along with this, the guide cylinder 9
slides on the rotating shaft 8 in the left-right direction. Switching pin 1
0 reaches the first abutting portion 12c, the guide cylinder 9 cannot slide, and when the cloth is further pulled down, the winding cylinder 2 and the guide cylinder 9
and will now be rotated as one. In this case, the one-way clutch 14 does not work, so the take-up cylinder 2 is freely rotated in the cloth pulling direction.

When the cloth is lowered to a desired position and the hand is released in this state, the cylinder 1 is rotated in the opposite direction by the torsion spring 3, but the switching pin 10 hits the second abutting portion 12e. Hit. Here, since the rotation of the rotation shaft 8 in the fabric winding direction is prevented by the one-way clutch 14, the rotation of the guide cylinder 9 is also prevented, and therefore the rotation of the winding cylinder 2 is prevented at this position. When the raw cloth 1 is stopped at a desired position, when the raw cloth is rolled up, when the raw cloth is slightly pulled, the switching pin 10 comes out from the second abutment part 12e and freely passes through the escape groove part 12f. It enters the groove 12a. Here, since the guide cylinder 9 is not restrained by the switching pin 10, the cylinder 2 rotates under the action of the torsion spring 3 and winds up the raw cloth.

In the roll screen lifting/lowering stop device described above, the distance in the rotational direction between the first abutting part 12c and the second abutting part 12e in the guide groove 12 shown in FIG. Let A be the upward return distance of the fabric when it is unrolled to the desired position and released, and the distance in the rotational direction of the escape groove 12f, that is, the distance in which the fabric is pulled slightly to pull it up. When the distance to be lowered is B, by setting B<A, the amount of pulling and lowering to cancel the stop can be reduced compared to the amount of return when stopping the cloth.
The roll screen can be raised and lowered reliably, and even when the cloth is completely unrolled, it can be released from the stop.
It is possible to completely prevent a situation where the roll screen cannot be stopped even if the roll screen is pulled down in an attempt to wind it up because the roll screen is fully lowered.

As described above, the roll screen lifting/lowering stop device according to the present invention has a simple structure, that is, the moving direction of the pin is reliably regulated by the bottom stepped portion of the guide groove provided on the circumferential surface of the guide cylinder. Once over the step, there will be no error in the roll screen due to reversing.

In addition, since it operates independently of the centrifugal force caused by the rotation of the winding pipe, unlike a lifting stop device using a ratchet, the lifting and lowering of the roll screen can always be stopped and canceled reliably. Furthermore, by forming the guide groove on the guide cylinder so that the distance to be pulled down for canceling the stop is smaller than the return distance of the raw cloth when the raw cloth is stopped, the above-mentioned "pulling-off"
can be completely prevented.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a roll screen equipped with the device of the present invention, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. 3 is a cross-sectional view of a roll screen provided with the device of the present invention. The developed views of the guide groove shown in FIGS. 4 to 6 are cross-sectional views of the guide groove taken along lines -, -, and - shown in FIG. 3, respectively. 1... Roll screen raw cloth, 2... Rolling cylinder, 3... Torsion spring, 4, 5... Bracket,
6... Switching clutch, 7... External frame, 8... Rotating shaft, 9... Guide cylinder, 10... Switching pin, 11
...Plate spring, 12...Guide groove, 13...Center shaft,
14...One-way clutch.

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. A lifting/lowering stop device for a roll screen includes an external frame body having a switching pin that is biased radially inward and elastically protrudes, a rotating shaft provided at the center of the external frame body, and a rotating shaft provided on the rotating shaft. A switching clutch equipped with a guide cylinder fixed in the circumferential direction and slidably in the axial direction and having a guide groove on the circumferential surface for receiving the switching pin is attached to the raw cloth winding cylinder. A guide groove disposed at one end, connecting the rotating shaft to the bracket of the roll screen via a one-way clutch that operates only in the cloth winding direction, and provided on the circumferential surface of the guide cylinder, When the cloth winding cylinder is rotated in the cloth winding direction by the action of the torsion spring, there is a free groove through which the switching pin can freely pass, and the cloth winding cylinder rotates in the cloth pulling direction. an entrance groove portion into which the switching pin is introduced when the switching pin is inserted; a first abutment portion at which the switching pin abuts at the end; an outlet groove portion into which the switching pin is introduced when rotated in the pulling direction; a second abutting portion with which the switching pin hits at the end thereof; and then a raw cloth winding cylinder body is rotated in the raw cloth pulling direction. At the same time, an escape groove part is provided through which the switching pin escapes from the second abutting part to the free groove part, and a connection part between the free groove part and the inlet groove part, a connection part between the inlet groove part and the outlet groove part, and an outlet groove part. A lifting and lowering stop device for a roll screen, characterized in that a bottom stepped portion is provided at a connecting portion between a groove and an escape groove and a connecting portion between an escape groove and a free groove for regulating the moving direction of the switching pin in one direction.