KR101438052B1 - An articulated fireproof screen shutter - Google Patents

Abstract

The present invention relates to a fireproof screen shutter for preventing a fire from spreading from a fire point by preventing fire hazards such as flames, smoke, and toxic gases from spreading to prevent fire from spreading to the entire interior of a building when a fire occurs.
A fire screening shutter according to the present invention includes: a support frame installed at a lower portion of a ceiling of a building; A guide frame which is fixed on the support frame and moves downward on the support frame when a fire is generated inside the building, And a screen shutter which is provided on the support frame and is inserted into the guide frame in a fire to be moved in the floor direction.
According to the above-described construction, the fire screening shutter according to the present invention has an effect of improving the heat shielding effect, thereby preventing the fire from spreading due to blockage and high temperature of the fire area.

Description

{AN ARTICULATED FIREPROOF SCREEN SHUTTER}

More particularly, the present invention relates to a fire screen shutter, and more particularly, to a screen screen provided in a fire screen shutter, in which a screen transition is prevented from being detached from a guide frame when guided in a state of being inserted into the guide frame, And more particularly, to a fire screen shutter that allows a fire screening guide to be smoothly guided.

Generally, a fire-retarding shutter is one of refractory structures installed to prevent a fire from spreading to the inside of a building in the event of a fire. It prevents the entrance of outside people into a specific space and also prevents fire, smoke and toxic gases (Hazard) factor to prevent evolving from the ignition point. It is equipped with an emergency escape door that can be used to quickly and safely evacuate people in the fire space and fire area.

Such a fire-retarding shutter is usually constituted by a drive device provided on a ceiling surface and a shutter driven by the drive device and descending to the bottom surface side. The shutter is composed of a steel shutter made of iron material and a fire retardant sheet There are mainly divided screen shutters which are made up of fire retardant sheets.

Therefore, the screen shutters are lowered in the area where the fire is generated inside the building, so as to block the internal compartment of the building, the flame, smoke and toxic gas are prevented from spreading from the fire area, So that damage can be minimized.

In addition, since the emergency shutter door is provided in the screen shutter, people can escape from the fire area through the emergency door even if the screen shutter is lowered when a fire occurs.

However, in the fire zone where the visual field can not be properly secured due to the smoke and toxic gas caused by the fire, it is possible to prevent the evolution of the hazard by the function of the fire shutter. However, There was a lot of trouble to safely evacuate.

In other words, emergency doors can not be easily found due to factors such as discoloration or loss of power due to smoke or toxic gas, absence of indication of emergency induction, etc., and emergency doors can be opened easily by people who are upset by the fire. There is a problem that it is difficult to escape from the fire zone quickly and quickly using the emergency door because the emergency door can not be operated properly because it is not operated properly.

In addition, it is necessary to prevent the dangerous factors such as flame, smoke, and toxic gas generated in the fire area from spreading to the other area by the people closing the emergency door opened for emergency escape. However, There is a problem in that the function of the fire-fighting shutter is lost because the operation of closing the emergency door in the open state of the fire-fighting shutter is not performed smoothly.

In the prior art, the automatic closing and tightening reinforcement structure of the escape door of the fireproof screen shutter, which is the registered patent No. 10-0789767, has been developed. It has an evacuation passage which is configured to penetrate squarely at a proper position of the screen shutter, An upper frame which is connected to one vertical side and is capable of being opened and closed by pivoting, an upper frame which is composed of metal on the upper and lower sides respectively, and a lower frame which is hinged to the lower frame of the shutter of the screen shutter through a hinge, One end of which is connected to the other vertical side of the evacuation passage so as to cover and cover the open side of the evacuation door through pivoting, and a known tension hinge for imparting selective bi-directional tensile force to the shutter lower frame of the screen shutter, A side cover including a lower frame which is hinged through a side surface of the evacuation door, A shutter lower frame at the lower end of the screen shutter and a lower frame at the lower end of the evacuation door, both ends of the shutter upper frame being fixed to the lower frame at the lower end of the evacuation door, and an evacuation The escape door support wire is fixed to both ends of the upper frame of the refuge door and the end of the shutter upper frame in a tense state in a tensioned state and an upper portion integrally attached to the screen shutter An upper cover base integrally provided at a lower portion of the evacuation door with a cover frame integrally formed at a lower portion of the evacuation door in a state capable of pivoting about the center of the evacuation door and having a first end fixed to an end portion of the upper frame, And a cover operating wire fixedly attached to the cover frame through a ring fixedly attached to the cover frame It is configured to hereinafter.

As another example, Japanese Patent Application No. 10-0844526 discloses an anti-fog screen shutter, which is provided with an emergency flap on an anti-fog screen, which can be opened and closed freely, The shutter includes a lid which overlaps with both sides of the emergency door, and a lid fastener that supports the lid to the emergency door.

Such prior art techniques have been developed to provide an emergency door in the screen shutter so that the emergency door can be opened quickly and quickly so that people can escape from the fire zone. However, not only does the emergency door fail to close quickly, The airtightness and airtightness between the emergency door and the screen shutter are significantly lowered, and the problem that the flame, smoke, and toxic gas generated from the fire area can not be properly prevented from spreading to other areas can not be solved.

In addition, most of the conventional screen shutter devices have a structure in which guide rails guiding the screen cloth for fire are immersed and received in the ceiling of the building. However, since the guide rails are stretched only by a simple antenna system, There was a problem that a large space was needed. That is, since most of the guide rails are divided into a basic fixed rail and a movable rail extended from the fixed rail, the movable rail is stretched and folded while being superimposed on the fixed rail by the antenna method. Therefore, a large space is required for installing the shutter device in the ceiling, and the ceiling of the building is lowered as much as the installation space.

In addition, in the conventional screen shutter device, when a pedestrian passing through the inside of the building looks up the ceiling, the inside of the doorway through which the screen cloth goes in and out is exposed.

In addition, the conventional screen shutter apparatus uses a fixed guide frame to smoothly operate the screen shutter in the event of a fire, which often causes obstruction to the copper line of the building, There is a problem in that it is not possible to use a fixed type guide frame such as a conventional screen shutter device according to the structure.

: Published Japanese Patent Application No. 10-2008-0109160 (published on December 17, 2008) : Domestic registered patent No. 10-0983342 (registered on September 14, 2010) : Korean Published Patent No. 10-2011-0096306 (published on August 30, 2011)

The present invention provides a screen transition guide rail which is provided in an incandescent screen shutter so as to prevent the screen transition from being detached from the guide frame when guided, To provide a fire screen shutter.

It is another object of the present invention to provide a fire screening shutter which can be uniformly wound without being deformed in a state in which the screen cloth is stretched when the screening cloth is wound on a ceiling inside the building by lifting and lowering.

It is another object of the present invention to provide a fire screening shutter which improves the heat shielding effect and prevents the fire from spreading due to fire and high temperature.

In addition, the present invention is configured such that the guide frame is composed of a plurality of nodes and is normally located at the upper ceiling, and when a fire occurs, the screen shutter is lowered and the joint type guide frame is also lowered, Which is capable of smoothly securing a fireproof screen shutter.

The various problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

A fire screening shutter according to the present invention includes: a support frame installed at a lower portion of a ceiling of a building; A guide frame which is fixed on the support frame and moves downward on the support frame when a fire is generated inside the building, And a screen shutter which is provided on the support frame and is inserted into the guide frame in a fire to be moved in the floor direction.

The support frame includes a plurality of support frames horizontally aligned with the ceiling of the building, and the support frame supports the guide frame and the screen shutter. And a guide rail provided on the rail support and pressing both sides of the guide frame in the left and right directions so that the guide frame is engaged.

Wherein the guide rail includes a first guide rail and a second guide rail having a predetermined length, wherein the first guide rail and the second guide rail are provided with a first wheel and a second wheel on one end surface thereof, The guide frame moving on both sides of the guide frame can be moved to the bottom or ceiling position by directly contacting the first and second wheels.

The guide frame includes a first guide frame and a second guide frame. The first guide frame and the second guide frame are coupled with each other by a fitting engagement by a fitting groove and a fitting protrusion, and can be moved up and down.

Wherein the first guide frame is constituted by a plurality of first frame cells connected to rotate within a predetermined angle range, the first frame cell is in contact with the first wheel and one side is aligned by the first wheel A fixed frame which is moved in the direction of the floor or the ceiling; And a moving frame which is integrally connected to the fixed frame and moves in a bottom or ceiling direction while being in direct contact with the second wheel and which is elongated or contracted by a predetermined length in one direction by an elastic force.

Wherein the movable frame comprises: a support rod having a rod shape of a predetermined length; And an elastic spring connected to the other side of the support rod and formed of an elastic material and stretched or contracted by a predetermined length.

Wherein the screen shutter is inserted into the spaced space when the distance between the fixed frame and the moving frame is separated by the first wheel and the second wheel; And a rotary drum for selectively rotating the screen transition in the winding or unwinding direction.

The screen cloth may be provided with protruding pieces located on both sides of the screen cloth so as to be spaced apart from each other by a predetermined distance in the vertical direction.

The details of other embodiments are included in the detailed description and drawings.

The present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. So that it can be guided.

In addition, the fire screening shutters according to the present invention have the effect of allowing the screens to be uniformly wound without being deformed in a state in which the screen cloths are pulled up when they are wound on a ceiling inside the building by lifting and lowering.

In addition, the fire screening shutters according to the present invention have an effect of improving the heat shielding effect and preventing fire from spreading due to blocking of a fire area and high temperature.

In addition, the fire screening shutter according to the present invention is configured such that the guide frame is composed of a plurality of nodes and is normally located at the upper ceiling, and when a fire occurs, the screen shutter is lowered and the joint type guide frame is also lowered , It is possible to smoothly secure a copper wire inside the building.

In addition, the fire screening shutter according to the present invention is configured to provide an articulated guide frame in which a plurality of nodes are combined, thereby making it possible to easily change the interior of the building in a desired direction .

It will be appreciated that embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

FIG. 1 is a view showing an example of an emergency exit with a fire screen shutter according to the present invention.
Figure 2 is a schematic view of a fire screen shutter according to the present invention.
FIGS. 3-6 illustrate the sequence of operation of the fire screening shutters according to the present invention.
7A and 7B are views showing the operation of the moving frame in the fire screening shutter according to the present invention.
8 is a cross-sectional view illustrating a first frame cell and a second frame cell in the fire screening shutter according to the present invention.
FIGS. 9A to 9C are views illustrating insertion of a screen transition into a guide frame in the fire screening shutter according to the present invention.
10 is a view showing a principle in which a gap between a moving frame and a fixed frame is spaced apart from a fire screen shutter according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity.

Terms such as top, bottom, top, bottom, or top, bottom, etc. are used to distinguish relative positions in components. For example, in the case of naming the upper part of the drawing as upper part and the lower part as lower part in the drawings for convenience, the upper part may be named lower part and the lower part may be named upper part without departing from the scope of right of the present invention .

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a fire screen shutter according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic view of a fire screening shutter according to an embodiment of the present invention. FIG. 3 is a perspective view of a fire screening shutter according to an embodiment of the present invention. FIG. 7A and 7B are views showing the operation of the moving frame in the fire screening shutter according to the present invention, FIG. 8 is a view showing the operation of the first frame cell and the second frame in the fire screening shutter according to the present invention, and FIG. 9A through 9C are views showing the screen transition inserted into the guide frame in the fire screening shutter according to the present invention, and FIG. 10 is a view showing the moving frame and the fixed frame in the fire screening shutter according to the present invention. And the intervals between the frames are spaced apart from each other.

1 to 10, the fire screening shutter 10 according to the present invention prevents the screen cloth 320 provided on the screen shutter 300 from being detached from the guide frame 200, The heat shielding effect can be improved to prevent the spread of the fire due to the blocking of the fire area and the high temperature. 1, the fire screening shutter 10 according to the present invention is constructed such that fire escape, smoke, and toxic gas are prevented from spreading from a building area having an emergency escape door 60 or a fire area, It may be installed in a place for blocking the compartment. The fire screening shutter 10 according to the present invention includes a support frame 100, a guide frame 200, and a screen shutter 300.

The support frame 100 may be installed under the ceiling of the building and may be provided for fixing the guide frame 200 and the screen shutter 300. A plurality of support frames 100 are provided horizontally to the ceiling of the building and may include a rail support 110 and a guide rail 120.

The rail support 110 can support or move the guide frame 200 and the screen shutter 300, and is composed of a plurality of horizontal axes. The screen shutter 300 is rotatably fixed on the rail support 110 and the guide frame 200 can be fixed to move up and down or horizontally.

The guide rail 120 may be provided on the rail support 110 and may be provided to allow the guide frame 200 to be accurately engaged. That is, the guide rails 120 push the both sides of the guide frame 200 in the left and right directions, so that the guide frames 200 moved in the vertical direction are correctly coupled and then moved toward the floor 50 or the ceiling of the building I will. The guide rail 120 includes a first guide rail 130 and a second guide rail 140.

The first guide rail 130 and the second guide rail 140 are integrally connected to each other and can be formed to have a predetermined length. That is, the first guide rail 130 and the second guide rail 140 are provided with a first wheel 132 and a second wheel 142 on one end face, respectively, The guide frame 200 can be moved to the floor 50 or the ceiling by contacting both the first and second wheels 132 and 142 directly. The guide frame 200 moving between the guide rails 120 has a reduced friction surface to be guided and smoothly guided and can be moved. The first wheel 132 and the second wheel 142 are configured to be stepped at a predetermined length so that the first wheel 132 and the second wheel 142 are positioned on opposite sides of the guide frame 200 The screen cloth 320 of the screen shutter 300 can be inserted into the guide frame 200 and moved.

The guide frame 200 is fixed on the support frame 100. When a fire occurs inside the building, the guide frame 200 blocks a partition inside the building so that flame, smoke, toxic gas, . The guide frame 200 is normally fixed on the support frame 100, and when a fire occurs, the guide frame 200 can be moved downward on the support frame 100 to partition the inside of the building. The guide frame 200 may fix one side and the other side of the screen shutter 300 when a fire occurs. The guide frame 200 includes a first guide frame 210 and a second guide frame 240.

The first guide frame 210 and the second guide frame 240 may be provided to fix the screen cloth 320 of the screen shutter 300 at one side and the other side, respectively. The first guide frame 210 and the second guide frame 240 may be directly coupled with each other and moved in the vertical direction. The first guide frame 210 and the second guide frame 240 may be inserted into the fitting grooves 230 And the fitting protrusions 260 and the fitting protrusions 260 are engaged with each other to secure the first and second guide frames 210 and 240 to each other. May be formed of a magnetic object. The first guide frame 210 may include a first frame cell 220 and a fitting groove 230.

The first frame cell 220 includes a plurality of first frame cells 220 connected in a vertical direction and the plurality of first frame cells 220 are connected to the first frame cell 220, (220) are hingedly coupled to adjacent first frame cells (220). The first frame cell 220 is formed in a generally rectangular tubular shape and the first frame cell 220 includes a fixed frame 222 and a moving frame 222.

The fixed frame 222 may be a part forming one side of the first frame cell 220 and may be moved in the bottom 50 or the ceiling direction directly in contact with the first wheel 132. The fixed frame 222 is in contact with the first wheel 132 and can be moved in the direction of the floor 50 or the ceiling while one side of the fixed frame 222 is aligned by the first wheel 132 have.

The moving frame 222 is integrally connected to the fixed frame 222 and is formed as a part forming the other side of the first frame cell 220. The moving frame 222 directly contacts the second wheel 142, ) Or in the ceiling direction. The movable frame 222 may be moved in one direction or another direction by a predetermined distance. The distance between the fixed frame 222 and the movable frame 222 is separated by the movement of the movable frame 222, The screen cloth 320 of the screen shutter 300 to be described below can be inserted and fixed on the spaced space of the frame 222 and the moving frame 222. [ The screen cloth 320 according to the present invention is inserted and fixed into a spaced space between the fixed frame 222 and the moving frame 222. The screen cloth 320 Is inserted and moved inside the guide frame 200, the inside of the building can be partitioned so that flame, smoke, and toxic gas do not spread from the area where the fire occurred. The moving frame 222 includes a support rod 226 and an elastic spring 228.

The support bar 226 and the elastic spring 228 are provided on the inner side of the moving frame 222 and can move the moving frame 222 by a predetermined distance by being stretched and contracted by a certain distance by an elastic force. The support bar 226 may be formed in a bar shape having a predetermined length and one side may be configured to directly abut one side of the movable frame 222 while the other side may be provided with an elastic spring 228. The elastic spring 228 may be formed of a material having elasticity and may be configured such that one side is directly connected to the other side of the support bar 226 and the other side is directly in contact with the other side of the moving frame 222.

The fitting groove 230 is provided on the other side of the first frame cell 220 and is formed in a groove shape having a predetermined depth and the fitting protrusion 230 of the second frame cell 250 constituting the second guide frame 240 260 may be combined. The fitting grooves 230 and the fitting protrusions 260 may be fitted together by a male and female coupling method. The second guide frame 240 is firmly coupled and can be moved up and down. In the present invention, the fitting protrusions 260 and the fitting grooves 230 may be configured to include a magnetic body for firm tightening.

The second guide frame 240 is formed with the first guide frame 210 and the first guide frame 210 and the second guide frame 240 are formed of a flame, The inside of the building can be partitioned so that gas and the like do not spread. The second guide frame 240 is different from the first protrusion 260 provided in the second frame cell 250 and includes the same components as the first guide frame 210. For convenience of explanation, The detailed description of the second guide frame 240 will be replaced with the description of the first guide frame 210.

The screen shutter 300 is installed on the ceiling of the building and is provided to prevent a flame, smoke, and toxic gas from diffusing by closing a certain area of the building by descending to the floor 50 of the building when a fire occurs . The screen shutter 300 is provided on the support frame 100. The gap between the fixed frame 222 and the movable frame 222 is adjusted by the first and second wheels 132 and 142 It may be positioned on the guide rail 120 so that the screen cloth 320 provided in the screen shutter 300 can be inserted into the spaced space. The screen shutter 300 includes a rotary drum 310 and a screen cloth 320.

The rotary drum 310 is installed to be selectively rotatable in a winding or unwinding direction by a rotary drum driving motor 312. The rotary drum 310 includes a rotary drum driving motor 312. The rotary drum driving motor 312 is provided at one side or the other side of the rotary drum 310 and is rotated The screen cloth 320 provided on the rotary drum 310 can be wound or unwound by rotating the drum 310 in the forward or reverse direction.

The screen cloth 320 is installed on the ceiling of the building and is wound by the driving motor 312 for rotating drum. When a fire occurs, the guide frame 200 descends toward the floor 50, The screen cloth 320 wound on the rotary drum 310 is lowered and inserted into the space between the fixed frame 222 and the movable frame 222 of the guide frame 200 to be lowered. That is, when a fire occurs in the building, the guide frame 200 and the screen shutter 300 are lowered in the direction of the floor 50. The guide frame 200, which passes through the guide rail 120, The gap between the fixed frame 222 and the moving frame 222 is separated by the stepped shape of the wheel 132 and the second wheel 142 and the screen cloth 320 descending in the spaced- So that the screen cloth 320 and the guide frame 200 are lowered together. The screen cloth 320 descending to the floor 50 of the building can block the passage to block the smoke and the flame and prevent the smoke or the flame from being transferred. The specific material of the screen cloth 320 is a well-known structure, and a detailed description thereof will be omitted. The screen cloth 320 may include protruding pieces 322 provided on both sides thereof.

The protruding pieces 322 may be provided on both sides of the screen cloth 320 and may be spaced vertically on both sides of the screen cloth 320 at regular intervals. The screen cloth 320 is inserted and moved inside the guide frame 200 in the fire screening shutter 10 according to the present invention in which the protrusion pieces 322 are fixed to the fixed frame 222 and the movable frame 222, So that it is possible to prevent the screen cloth 320 from being detached outside the guide frame 200. That is, when the movable frame 222 is moved in one direction by the elastic force of the elastic spring 228 and the gap between the movable frame 222 and the fixed frame 222 is separated And the inserted protruding piece 322 is tensioned so as to stretch the screen cloth 320 in both directions so that the screen cloth 320 is unfolded in an unfolded state, It is possible to prevent the smoke or flame from being transferred.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that one embodiment described above is illustrative in all aspects and not restrictive.

10; Fire screen shutters 50; floor
60; Emergency escape door 100; Support frame
110; Rail support 120; Guide rail
130; A first guide rail 132; The first wheel
140; A second guide rail 142; The second wheel
200; Guide frame 210; The first guide frame
220; A first frame cell 222; Fixed frame
224; A moving frame 226; Support bar
228; Elastic spring 230; Fitting groove
240; A second guide frame 250; The second frame cell
260; A fitting protrusion 300; Screen shutter
310; A rotary drum 312; Driving motor for rotary drum
320; Screen cloth 322; Projecting pieces

Claims (8)

A support frame installed under the ceiling of the building;
A guide frame which is fixed on the support frame and moves downward on the support frame when a fire is generated inside the building, And
And a screen shutter which is provided on the support frame and is inserted into the guide frame and moved in a bottom direction in the event of a fire,
The support frame includes:
A rail support which is provided in plural in a horizontal direction with respect to the ceiling of the building and in which the guide frame and the screen shutter can be supported or moved; And
And a guide rail provided on the rail support and pressing both sides of the guide frame in the lateral direction so that the guide frame is engaged.
delete The method according to claim 1,
The guide rail includes a first guide rail having a predetermined length and a second guide rail,
The first guide rail and the second guide rail are provided with first and second wheels on one end surface thereof. The guide frame moving between the guide rails has both side surfaces directly contacting the first and second wheels, Or to the ceiling position.
The method according to claim 1,
The guide frame includes a first guide frame and a second guide frame,
Wherein the first guide frame and the second guide frame are coupled with each other by a fitting engagement by a fitting groove and a fitting protrusion, and are moved up and down.
5. The method of claim 4,
Wherein the first guide frame comprises a plurality of first frame cells connected to rotate within a predetermined angle,
Wherein the first frame cell comprises:
A fixed frame which is in contact with the first wheel and is moved in the floor or ceiling while being aligned on one side by the first wheel; And
And a movable frame integrally connected to the fixed frame and moved in a bottom or ceiling direction while being in direct contact with the second wheel and being stretched or contracted by a certain length in one direction by an elastic force, .
6. The method of claim 5,
The moving frame includes:
A support rod having a rod shape having a predetermined length; And
And an elastic spring connected to the other side of the support rod and formed of an elastic material and stretched or contracted by a predetermined length.
6. The method of claim 5,
The screen shutter includes:
A screen cloth inserted into the spaced space when the distance between the fixed frame and the moving frame is separated by the first and second wheels; And
And a rotary drum for allowing the screen transition to be selectively rotated in the winding or unwinding direction.
8. The method of claim 7,
Wherein the screen cloth is provided with protruding pieces located on both sides of the screen cloth at predetermined intervals in the vertical direction.

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