阅读说明：本技术 可挠式材料360度双向折叠耐久性试验用装置 (Device for testing durability of flexible material folded in 360 degrees in two directions ) 是由 李基龙 文炫奉 柳浩文 墎昌信 于 2020-03-04 设计创作，主要内容包括：本发明提出一种用可挠式材料360度双向折叠耐久性试验用装置,其中在薄膜型可挠式材料的折叠测试中,单一折叠装置可以实现可挠式材料相对于展开状态的内折和外折。因此,所述装置包括：一固定单元,配置以固定试验用的所述可挠式材料的一第一侧；一移动单元,配置以固定所述可挠式材料的一第二侧,并设置为与所述固定单元隔开；一运动引导单元,所述固定单元固定至所述运动引导单元；以及一运动单元,连接所述运动引导单元以及所述移动单元。(The invention provides a device for testing the durability of 360-degree bidirectional folding of a flexible material, wherein in the folding test of a film type flexible material, a single folding device can realize inward folding and outward folding of the flexible material relative to an unfolded state. Thus, the device comprises: a fixing unit configured to fix a first side of the flexible material for testing; a moving unit configured to fix a second side of the flexible material and disposed to be spaced apart from the fixing unit; a movement guide unit to which the fixing unit is fixed; and a motion unit connected to the motion guide unit and the moving unit.)

1. An apparatus for testing durability of a flexible material folded in two directions at 360 degrees, the apparatus comprising:

a fixing unit configured to fix a first side of the flexible material for testing;

a moving unit configured to fix a second side of the flexible material and disposed to be spaced apart from the fixing unit, such that a plane of the moving unit and a plane of the fixing unit are the same plane in an unfolded state of the flexible material, the moving unit being configured to rotate with respect to the fixing unit, thereby folding the flexible material inward or outward in the unfolded state;

a movement guide unit to which the fixing unit is fixed and which forms a rotation path of the moving unit so as to rotate the moving unit with respect to a center point between the fixing unit and the moving unit; and

a motion unit connecting the motion guide unit and the moving unit,

the movable unit can pivot relative to the moving unit so as to respond to each inward folding and outward folding of the flexible material, and can slide along a normal direction passing through a center point between the fixed unit and the movable unit.

2. The apparatus of claim 1, wherein a circular guide groove portion is formed in the motion guide unit by being depressed corresponding to the rotation path of the moving unit,

the motion unit includes:

a rotation shaft positioned at the center point and rotatably disposed at the motion guide unit;

a movement resistance member fixed to the rotation shaft;

a sliding resistance member coupled to the movement resistance member such that the sliding resistance member is slidable along a longitudinal direction of the movement resistance member; and

a guide stopper rotatably coupled to the slide stopper and having a guide protrusion formed on the guide stopper by protruding from the guide stopper, the guide protrusion being fitted and coupled to the guide groove part so that the guide protrusion moves along the guide groove part in response to rotation of the moving unit, and

the moving unit is fixed to the guide block.

3. The apparatus of claim 2, wherein the guide-groove portion is provided with: an invagination stopper indicating the invagination completion position of the flexible material; and an out-folding stopper indicating an out-folding completion position of the flexible material.

4. The apparatus of claim 2, wherein the channel guide portion comprises:

an arc-shaped first inward-folding groove which forms a moving path of the guide protrusion according to the inward folding in a plurality of moving paths of the moving unit;

an arc-shaped second flap groove formed at an outer side of the first flap groove to be parallel thereto, and constituting a moving path of the guide protrusion according to the flap in the moving path of the moving unit;

an arc-shaped first outward folding groove which is communicated with the first inward folding groove and forms a moving path of the guide protrusion part according to the outward folding in the moving path of the moving unit; and

an arc-shaped second outwardly folded groove communicating with the second inwardly folded groove, formed at an outer side of the first outwardly folded groove to be parallel thereto, and constituting the moving path of the guide protrusion according to the outward folding in the moving path of the moving unit.

5. The device of claim 4, wherein the guide projection comprises:

a first tab that moves in the first fold-in slot and the first fold-out slot; and

a second protrusion moving in the second fold-in groove and the second fold-out groove,

wherein either one of the first and second protruding portions is a virtual straight line passing through the center point, and

the other of the first protrusion and the second protrusion is another virtual straight line passing through the center point.

6. The apparatus of any of claims 1 to 5, further comprising:

any one of a motion driving unit configured to rotate the motion unit with respect to the motion guide unit and a rotation restricting unit located at the central point and configured to select whether to rotate the moving unit with respect to the motion guide unit.

7. The apparatus of any one of claims 1 to 5, wherein a radius of curvature of the folded-in curved portion formed of the flexible material in the folded-in state is R0, and when a radius of curvature of the folded-out curved portion formed of the flexible material in the folded-out state is R1, R1 represents a radius of curvature greater than R0, and a distance between the fixed unit and the moving unit is represented as π R1.

Technical Field

The invention relates to a device for testing 360-degree bidirectional folding durability of a flexible material. More particularly, the present invention relates to an apparatus for testing durability of a flexible material folded in two directions at 360 degrees, wherein a single folding apparatus can perform inward folding and outward folding of the flexible material with respect to an unfolded state in a folding test of a film-type flexible material.

Background

Generally, conventional display panels for televisions, computer monitors, or various portable electronic devices all use non-flexible glass substrates and have a flat structure, so that they are not changed and have limited application modes.

Recently, due to the development of scientific technology, a flexible display device made of a flexible material such as plastic and bendable has been developed and produced in place of a non-flexible glass substrate. For example, technologies for manufacturing flexible display panels that can be folded or rolled up like a roll have been developed.

For example, U.S. patent application publication No. 2014/0247544 (roll type flexible device for display) discloses a technique in which a flexible display portion is wound on a roll inside a case by using a lever assembly that connects a plurality of levers having a rotatable X shape to each other.

Display elements used in the various types of flexible display devices described above include thin film transistor liquid crystal displays, organic light emitting elements, electrophoretic elements, and the like, and the durability of a material applied thereto (hereinafter referred to as a flexible material) is directly related to the life of a product, and therefore, a durability test is performed on a selected material before the product is designed.

The durability test includes a wide variety of durability tests, including a fold test. The fold test is a test of repeatedly bending and unfolding a flexible material. For example, an apparatus is used which mechanically rotates a rotating plate, a portion of a flexible material sample of which is fixed to a fixed plate and the remaining portion of which is fixed to the rotating plate.

However, this type of folding apparatus cannot accurately perform the folding test. Because the rotating plate cannot prevent tension from being applied to the flexible material during rotation. Movement does not only allow bending of the flexible material, which can result in a significant reduction in the reliability of the fold test.

In the prior art, there are korean patent No. 10-1349789 (test device for film bending) and korean patent application laid-open No. 10-2016-.

Disclosure of Invention

Technical problem

In order to solve the problems occurring in the prior art, the present invention is directed to a device for testing durability of a flexible material folded in two directions at 360 degrees, wherein a single folding device can fold the flexible material inward and outward relative to an unfolded state during a folding test of a film-type flexible material.

Technical scheme

To achieve the above objects, according to an exemplary embodiment, an apparatus for testing durability of a flexible material folded in two directions by 360 degrees according to the present invention includes: a fixing unit configured to fix a first side of the flexible material for testing; a moving unit configured to fix a second side of the flexible material and disposed to be spaced apart from the fixing unit, such that a plane of the moving unit and a plane of the fixing unit are the same plane in an unfolded state of the flexible material, the moving unit being configured to rotate with respect to the fixing unit, thereby folding the flexible material inward or outward in the unfolded state; a movement guide unit to which the fixing unit is fixed and which forms a rotation path of the moving unit so as to rotate the moving unit with respect to a center point between the fixing unit and the moving unit; and a moving unit connecting the moving guide unit and the moving unit, wherein the moving unit is pivotable with respect to the moving unit to respond to each of inward and outward folding of the flexible material and is slidable in a normal direction passing through a center point between the fixing unit and the moving unit.

Here, a circular guide groove portion is formed in the motion guide unit by being depressed corresponding to the rotation path of the moving unit, the moving unit including: a rotation shaft positioned at the center point and rotatably disposed at the motion guide unit; a movement resistance member fixed to the rotation shaft; a sliding resistance member coupled to the movement resistance member such that the sliding resistance member is slidable along a longitudinal direction of the movement resistance member; and a guide stopper rotatably coupled to the slide stopper and having a guide protrusion formed on the guide stopper by protruding from the guide stopper, the guide protrusion being fitted and coupled to the guide groove part so that the guide protrusion moves along the guide groove part in response to rotation of the moving unit, and the moving unit may be fixed to the guide stopper.

Herein, the guide groove portion may be provided with: an invagination stopper indicating the invagination completion position of the flexible material; and an out-folding stopper indicating an out-folding completion position of the flexible material.

Herein, the guide groove part may include: an arc-shaped first inward-folding groove which forms a moving path of the guide protrusion according to the inward folding in a plurality of moving paths of the moving unit; an arc-shaped second flap groove formed at an outer side of the first flap groove to be parallel thereto, and constituting a moving path of the guide protrusion according to the flap in the moving path of the moving unit; an arc-shaped first outward folding groove which is communicated with the first inward folding groove and forms a moving path of the guide protrusion part according to the outward folding in the moving path of the moving unit; and an arc-shaped second outwardly folded groove which is communicated with the second inwardly folded groove, is formed at an outer side of the first outwardly folded groove to be parallel thereto, and constitutes the moving path of the guide protrusion according to the outwardly folded in the moving path of the moving unit.

Herein, the guide protrusion may include: a first tab that moves in the first fold-in slot and the first fold-out slot; and a second protrusion moving in the second fold-in groove and the second fold-out groove, wherein either one of the first protrusion and the second protrusion may be a virtual straight line passing through the center point, and the other one of the first protrusion and the second protrusion may be another virtual straight line passing through the center point.

The device for testing the durability of the 360-degree bidirectional folding of the flexible material according to the present invention may further comprise: any one of a motion driving unit configured to rotate the motion unit with respect to the motion guide unit and a rotation restricting unit located at the central point and configured to select whether to rotate the moving unit with respect to the motion guide unit.

According to the apparatus for testing 360-degree bidirectional folding endurance of the flexible material of the present invention, when a curvature radius of the folded-in curved portion of the flexible material is R0 in the folded-in state, and a curvature radius of the folded-out curved portion of the flexible material is R1 in the folded-out state, R1 may represent a curvature radius larger than R0, and a distance between the fixed unit and the moving unit may be represented as rr 1.

Advantageous effects

According to the device for testing the durability of the 360-degree bidirectional folding of the flexible material, in the folding test of the film type flexible material, the single folding device can realize inward folding and outward folding of the flexible material relative to the unfolded state. In other words, in the folding test of the film-type flexible material, the single folding device repeatedly folds the flexible material by 180 degrees with respect to the flexible material toward one side of each of the opposite surfaces of the flexible material, whereby the flexible material can be repeatedly folded in the opposite direction, and thus, the radius of curvature of the inflected curved portion according to the inflexion of the flexible material is different from the radius of curvature of the inflected curved portion according to the inflexion of the flexible material.

In addition, according to the present invention, unnecessary movement of the moving unit during rotation of the moving unit can be prevented due to the coupling relationship of the movement guide unit and the moving unit.

Furthermore, according to the present invention, since the configuration of the moving unit is detailed, the rotation of the moving unit can be efficiently performed, and a force including a tensile force is not applied to the flexible material when the flexible material is folded in and out during the folding test of the flexible material, thereby ensuring high reliability of the test and enabling a corresponding precise durability evaluation.

Further, according to the present invention, since the stopper is disposed, when the flexible material is folded inward and outward during the folding test of the flexible material, the guide protrusion portion can be stopped at the guide groove portion, and the folding completion state of the flexible material can be secured.

In addition, according to the present invention, since the detailed arrangement of the guide groove portion defines the rotation path of the moving unit, the state in which the fixing unit and the moving unit are parallel to each other is stabilized at the folding completion position.

In addition, according to the present invention, it is possible to stably move the moving unit during the rotation of the moving unit due to the detailed configuration of the guide protrusion.

In addition, according to the present invention, the folding test can be automated due to the configuration of the motion driving unit.

In addition, according to the present invention, it is possible to select whether to rotate the moving unit due to the configuration of the rotation restricting unit.

Also, according to the present invention, since the number of the respective elements of the single folding device is limited, the fold-in and fold-out of the single folding device can be prevented from interfering with each other, and the flexible material can be safely protected.

Drawings

Fig. 1 is a perspective view showing an apparatus for testing durability of a flexible material folded in two directions by 360 degrees according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view showing a detailed configuration of a moving unit of an apparatus for testing durability of a 360-degree bidirectional folding of a flexible material according to an embodiment of the present invention.

FIG. 3 is a front cross-sectional view of an apparatus for testing durability of a flexible material folded in two directions at 360 degrees, according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of an apparatus for testing durability of a flexible material folded in two directions by 360 degrees according to an embodiment of the present invention.

FIG. 5 is a cross-sectional plan view of an apparatus for testing durability of a flexible material folded in two directions at 360 degrees, according to an embodiment of the present invention.

FIG. 6 is a conceptual diagram illustrating inward folding and outward folding of an apparatus for testing durability of a flexible material folded in 360 degrees in both directions according to an embodiment of the present invention.

Fig. 7 is a diagram illustrating an unfolded state of the apparatus for testing durability of a flexible material folded in 360 degrees in two directions according to an embodiment of the present invention.

Fig. 8 is a diagram illustrating a folding-in completed state of the apparatus for testing durability of a flexible material folded in 360 degrees in two directions according to an embodiment of the present invention.

Fig. 9 is a diagram illustrating a folding-out completed state of the apparatus for testing durability of a flexible material folded in 360 degrees in two directions according to an embodiment of the present invention.

Detailed Description

Hereinafter, an embodiment of an apparatus for testing 360 degree bi-directional folding endurance of a flexible material according to the present invention will be described with reference to the accompanying drawings. In this case, the present invention is not limited to the embodiments. In addition, in describing the present invention, a detailed description of well-known functions or configurations may be omitted so as to clarify the gist of the present invention.

Referring to fig. 1 to 6, an apparatus for testing 360-degree bidirectional folding endurance of a flexible material according to an embodiment of the present invention includes: the fixing unit 10, the moving unit 20, the motion guide unit 30, and the moving unit 40, and may further include at least one of a motion driving unit 50 and a rotation limiting unit 60.

The fixing unit 10 fixes a first side of the flexible material F for testing.

The fixing unit 10 is fixed to the movement guide unit 30 by a fixing bracket 11.

The moving unit 20 fixes the second side of the flexible material F. The moving unit 20 is provided to be spaced apart from the fixing unit 10 such that the moving unit 20 and the fixing unit 10 are flush with each other in the unfolded state of the flexible material. The moving unit 20 rotates with respect to the fixing unit 10, and may fold the flexible material F in the unfolded state inward and outward.

More specifically, the moving unit 20 may pivot with respect to the moving unit 40 to respond to the inward and outward folding of the flexible material F, and may slide in a normal direction passing through a center point between the fixing unit 10 and the moving unit 20. Therefore, when the moving unit 20 folds the flexible material F inward and outward in the unfolded state, a force including a tensile force is not applied to the flexible material F.

As shown in fig. 6, when the radius of curvature of the folded-in curved portion formed by the flexible material in the folded-in state is R0 and the radius of curvature of the folded-out curved portion formed by the flexible material in the folded-out state is R1, R1 is a radius of curvature greater than R0, and the distance between the fixed unit 10 and the moving unit 20 can be represented as rr R1. In embodiments of the present invention, R1 may be 2 to 3 times larger than R0.

Therefore, in the embodiment of the invention, when the single folding device is used for folding the flexible material in the unfolded state, the single folding device can smoothly bend the flexible material in the state that the inward folding and the outward folding do not interfere with each other.

The moving unit 20 is fixed to the moving unit 40 by the moving bracket 21.

The fixing unit 10 is fixed to the movement guide unit 30. A rotation path of the moving unit 20 is formed in the motion guide unit 30 so that the moving unit 20 can be rotated with respect to a center point between the fixing unit 10 and the moving unit 20.

More specifically, a circular guide groove portion is formed in the motion guide unit 30 by corresponding to a rotation path of the moving unit 20. The center of the circular guide groove portion may be selected as a center point between the fixed unit 10 and the moving unit 20.

The channel portion may be configured in a double configuration.

More specifically, the guide groove portion may include: an arc-shaped first fold-in groove 31 formed in the moving unit 40 and constituting a moving path of the guide protrusion (first protrusion 443) according to a fold-in the moving path of the moving unit 20; an arc-shaped second flap groove 32 which is positioned outside the first flap groove 31 to be parallel to each other, is formed in the moving unit 40, and constitutes a moving path of the guide protrusion (second protrusion 444) according to the flap-in the moving path of the moving unit 20; an arc-shaped first fold-out groove 33 which communicates with the first fold-in groove 31, is formed in the moving unit 40, and constitutes a moving path of the guide protrusion (first protrusion 443) according to a fold-out in the moving path of the moving unit 20; and an arc-shaped second outside folding groove 34 which communicates with the second inside folding groove 32, is formed outside the first outside folding groove 33 to be parallel thereto, is formed in the moving unit 40 according to the outside folding in the moving path of the moving unit 20, and constitutes a moving path of the guide protrusion (second protrusion 444).

In this case, the first inward folding groove 31 and the first outward folding groove 33 may have a circular shape centered at a center point therebetween, and the second inward folding groove 32 and the second outward folding groove 34 may have a circular shape centered at a center point therebetween.

Here, the guide groove portion is provided with an inward folding stopper 301 and an outward folding stopper 302, the inward folding stopper 301 indicating an inward folding completion position of the flexible material, and the outward folding stopper 302 indicating an outward folding completion position of the flexible material. Therefore, the moving unit 20 is prevented from further rotating in the inward folding completed state of the flexible material F and in the outward folding completed state of the flexible material F.

In other words, the fold-in stopper 301 is formed at the free end of the first fold-in groove 31 and the free end of the second fold-in groove 32, and the fold-out stopper 302 is formed at the free end of the first fold-out groove 33 and the free end of the second fold-out groove 34.

In this case, since the fold-in stopper 301 formed at the free end of the second fold-in groove 32 is disposed at a lower side than the fold-in stopper 301 at the free end of the first fold-in groove 31 with respect to the position of the fold-in stopper 301 with respect to the fixed unit 10 when viewed from the side, the fixed unit 10 and the moving unit 20 are substantially parallel to each other in the folded-in state of the flexible material F.

Further, since the fold-out stopper 302 formed at the free end of the second fold-out groove 34 is provided at a lower side than the fold-out stopper 302 at the free end of the first fold-out groove 33 with respect to the position of the fold-out stopper 302 with respect to the fixed unit 10 when viewed from the side, the fixed unit 10 and the moving unit 20 are substantially parallel to each other in the folded-out state of the flexible material F.

The moving unit 40 connects the movement guide unit 30 and the moving unit 20.

The motion unit 40 may include: a rotation shaft 41 positioned at a center point and rotatably provided at the motion guide unit 30; a movement resistor 42 fixed to the rotation shaft 41 and protruding in the direction of a virtual straight line passing through the center point; a slide stopper 43 coupled to the movement stopper 42 such that the slide stopper 43 can slide along the longitudinal direction of the movement stopper 42; and a guide stopper 44 rotatably coupled to the slide stopper 43 and having a guide protrusion formed thereon, the guide protrusion being fitted and coupled to the guide groove part so that the guide protrusion moves along the guide groove part in response to the rotation of the moving unit 20. In this case, the moving unit 20 is fixed to the guide stopper 44 by the moving bracket 21.

In this case, the slide stopper 43 slides with respect to the movement stopper 42 when the moving unit 20 moves, and the guide protrusion stably moves and is inserted into the guide groove portion when the guide stopper 44 rotates with respect to the slide stopper 43, and the fixing unit 10 and the moving unit 20 are substantially parallel to each other in a state where the folding-in of the flexible material F is completed and in a state where the flexible material F is folded-out.

The guide seat portion 421 may be concavely formed at the movement resistor 42 such that the connection guide 45 is coupled to the guide seat portion 421.

The stopper seat 422 may be concavely formed at the movement stopper 42 so that the fixing body 442 of the guide stopper 44 may be inserted into and removed from the stopper seat 422 in response to the sliding of the slide stopper 43.

A pivot hole 431 may be penetratingly formed at the slide stopper 43 such that the guide stopper 44 is rotatably inserted into the pivot hole 431 so that the guide stopper 44 and the moving unit 20 are coupled to each other. A stopper support bearing 432 may be provided on an inner wall of the pivot hole 431 to support the rotating body 441 guiding the stopper 44 such that the rotating body is rotated.

The guide stopper 44 is rotatably coupled to the slide stopper 43, and may include: a rotating body 441 to which the moving unit 20 is fixed by the moving bracket 21; and a fixed body 442 provided to the rotating body 441 and having a guide protrusion formed to protrude from the fixed body 442.

Here, two guide protrusions are formed to be spaced apart from each other and to protrude from the fixing body 442, corresponding to the guide groove portion having a double structure.

More specifically, the guide protrusion includes: a first protrusion 443 that moves in the first fold-in groove 31 and the first fold-out groove 33; and a second protrusion 444 spaced apart from the first protrusion 443 and moving in the second fold-in groove 32 and the second fold-out groove 34. In this case, either one of the first and second protrusions 443, 444 may be included in any one virtual straight line passing through the center point, and the other one of the first and second protrusions 443, 444 may be included in another virtual straight line passing through the center point. In an embodiment of the present invention, when the first protrusion 443 includes any virtual straight line passing through the center point, the second protrusion 444 is disposed in front of the virtual straight line including the first protrusion 443 with respect to the fold-in direction.

The moving unit 40 may further include at least any one of a connection guide 45 and a support bearing 46, the connection guide 45 connecting the movement resistor 42 and the sliding resistor 43, and the support bearing 46 supporting the guide resistor 44 to be rotatable with respect to the sliding resistor 43.

The connection guide 45 may include: a movement support portion 451 coupled to the guide seat portion 421 of the movement resistor 42; a guide support portion 452 coupled to the slide stopper 43 so as to face the movement support portion 451; and a slider 453 fitted and slidably coupled to a position between the movement supporting part 451 and the guide supporting part 452. In this case, the slide stopper 43 can smoothly slide with respect to the movement stopper 42.

The support bearing 46 may be inserted into the pivot hole 431 of the slide stopper 43. Support bearings 46 may be provided on each opposite side of the stop support bearing 432.

The movement driving unit 50 rotates the movement unit 40 with respect to the movement guide unit 30. The motion driving unit 50 may rotate the rotation shaft 41 of the motion unit 40 in clockwise/counterclockwise directions by a force applied to the motion driving unit 50.

The rotation limiting unit 60 located at the center point selects whether to rotate the moving unit 20 with respect to the motion guide unit 30. The rotation restricting unit 60 includes: a restricting bracket 61 provided at the movement guide unit 30; and a restricting lever 62 coupled to the restricting bracket 61 through a restricting shaft 63 so that the restricting lever 62 can pivot. The restricting lever 62 is formed with a shaft through hole 621 therethrough, and the rotating shaft 41 passes through the shaft through hole 621.

In this case, the rotating shaft 41 is freely rotated in the shaft through hole 621 in the idle rotation state. In addition, when the restricting lever 62 pivots, the holding surface formed on the rotating shaft 41 is supported in close contact with the inner wall of the shaft through hole portion 621, and thus the rotation of the rotating shaft 41 can be restricted.

Reference symbol B is a base unit to which the movement guide unit is fixed. The fixed unit 10 is installed at the base unit B, and a folding space B1 in which the moving unit 20 can rotate is formed. The reference symbol P in indicates a moving path of the moving unit 20 according to the inward folding of the flexible material F, and the reference symbol P out indicates a moving path of the moving unit 20 according to the outward folding of the flexible material F.

As shown in fig. 7, in the unfolded state of the flexible material F, the fixing unit 10 and the moving unit 20 are disposed on the same plane.

When the flexible material is folded inward with respect to its unfolded state, the rotation shaft 41 rotates counterclockwise, and the moving unit 40 and the moving unit 20 rotate counterclockwise with respect to the rotation shaft 41. In this case, according to the coupling relationship of the guide protrusion and the guide groove portion, unnecessary movement of the moving unit 20 can be avoided. Also, according to the coupling relationship of the guide protrusion and the guide groove portion, the slide stopper 43 may slide with respect to the movement stopper 42, and the guide stopper 44 may rotate with respect to the slide stopper 43, so that a force including a tensile force may not be applied to the flexible material F.

When the guide projection is supported by the fold-in stopper 301, the fold-in is completed.

As shown in fig. 8, in the folded-in state, the fixed unit 10 and the moving unit 20 are parallel to each other by a distance 2R 0. In this case, the movement resistor 42 may be disposed on the same virtual straight line as the slide resistor 43, but the slide resistor 43 and the moving unit 20 may cross each other because the guide resistor 44 rotates with respect to the slide resistor 43.

In addition, when the rotation shaft 41 rotates clockwise in the folded-in state of the flexible material, the flexible material may be restored to the unfolded state.

When folded outward with respect to the unfolded state, the rotation shaft 41 rotates clockwise, and the moving unit 40 and the moving unit 20 rotate clockwise with respect to the rotation shaft 41. In this case, according to the coupling relationship of the guide protrusion and the guide groove portion, unnecessary movement of the moving unit 20 can be avoided. Also, according to the coupling relationship of the guide protrusion and the guide groove portion, the slide stopper 43 may slide with respect to the movement stopper 42, and the guide stopper 44 may rotate with respect to the slide stopper 43, so that a force including a tensile force may not be applied to the flexible material F.

When the guide projection is supported by the fold-out stopper 302, the fold-out is completed.

As shown in fig. 9, in the folded state, the fixed unit 10 and the moving unit 20 are parallel to each other by a distance 2R 1. In this case, the movement resistor 42 may be disposed on the same virtual straight line as the slide resistor 43, but the slide resistor 43 and the moving unit 20 may cross each other because the guide resistor 44 rotates with respect to the slide resistor 43.

When the rotation shaft 41 rotates counterclockwise in the folded state of the flexible material, the flexible material returns to the unfolded state.

According to the device for testing the durability of the 360-degree bidirectional folding of the flexible material, in the folding test of the film type flexible material F, the single folding device can realize inward folding and outward folding of the flexible material F relative to the unfolding state. In other words, in the folding test of the film-type flexible material F, the single folding device repeatedly folds the flexible material F by 180 degrees toward one side of each of the opposite surfaces of the flexible material F with respect to the flexible material F, whereby the flexible material F can be repeatedly folded in the opposite direction, and thus, the radius of curvature of the inflected curved portion F1 inflected in accordance with the flexible material is different from the radius of curvature of the inflected curved portion F2 inflected in accordance with the flexible material.

In addition, due to the coupling relationship of the motion guide unit 30 and the motion unit 40, unnecessary movement of the moving unit 20 during rotation of the moving unit 20 can be avoided.

Moreover, since the configuration of the moving unit 40 is detailed, the rotation of the moving unit 20 can be effectively performed, and when the flexible material F is folded in and out during the folding test of the flexible material F, a force including a tensile force is not applied to the flexible material F, thereby ensuring high reliability of the test and enabling a corresponding precise durability evaluation.

Further, due to the arrangement of the stoppers 301 and 302, when the flexible material is folded inward and outward during the folding test of the flexible material, the guide protrusion portion can be stopped at the guide groove portion, and the folding completion state of the flexible material F can be secured.

In addition, due to the detailed arrangement of the guide groove portion, a rotation path of the moving unit 20 is defined, thereby stabilizing a state in which the fixing unit 10 and the moving unit 20 are parallel to each other at the folding completion position.

In addition, according to the present invention, it is possible to stably move the moving unit 40 during the rotation of the moving unit 20 due to the detailed configuration of the guide protrusion.

In addition, the folding test can be automated due to the configuration of the motion driving unit 50.

In addition, due to the configuration of the rotation restricting unit 60, it is possible to select whether to rotate the moving unit 20.

Also, since the number of the respective elements of the single folding device is limited, the fold-in and fold-out of the single folding device can be prevented from interfering with each other, and the flexible material F can be safely protected.

Although exemplary embodiments of the apparatus of the present disclosure have been described with reference to the above-described drawings, those skilled in the art may make various modifications or alterations to the apparatus of the present disclosure without departing from the spirit and scope of the disclosure as set forth in the following claims.

Industrial applicability

According to the invention, in the folding test of the film type flexible material, the single folding device can realize inward folding and outward folding of the flexible material relative to the unfolding state of the flexible material.