Fork arm retractable roll-up screen electronic device

Abstract

The fork arm retractable and unfoldable roll-up screen electronic device involved in the present invention comprises a fork arm unit and a roll-up screen unit, wherein the fork arm unit comprises a fork arm assembly and a power device, the roll-up screen unit comprises a curler, a roll-up screen wound on the curler, the roll-up screen is connected to the fork arm assembly from both ends and retracts and unfolds synchronously with the fork arm, the fork arm assembly comprises a reference seat and a moving seat which move relative to each other along the retraction and unfolding direction of the roll-up screen, a first fork arm and a second fork arm which are rotatably connected from the pivotal end and can relatively move closer or open to retract and unfold. On the one hand, the present invention is based on the retraction and unfolding movement of the first and second forks, and realizes the synchronous retraction and unfolding of the roll-up screen through the relative movement of the moving seat and the reference seat and the motion guide formed by the curler, which effectively improves the stability of the force on the surface of the roll-up screen and has strong reliability; on the other hand, it can ensure the precise and synchronous movement of the two ends of the roll-up screen during the retraction and unfolding process, optimize the retraction and unfolding texture of the roll-up screen, and effectively improve the user experience.

Description

Technical Field

[0001] The invention belongs to the field of communication equipment, and in particular relates to a fork arm retractable curling screen electronic device. Background Art

[0002] As we all know, in order to display more abundant information to users, improve the efficiency of human-computer communication and enhance the user experience, various electronic equipment terminals (such as mobile phones, tablet computers, etc.) are constantly updated and replaced, and the screen size is getting larger and larger. Correspondingly, electronic equipment terminals with large screens will bring problems of inconvenience in carrying and storage.

[0003] Therefore, in order to solve the above problems, flexible rollable screen technology came into being. It mainly rolls the rollable screen on a reel and releases or retracts the rollable screen to obtain display segments of different sizes. At the same time, in the process of unfolding or contracting the rollable screen, in order to keep the rollable screen in a tensioned state, it is usually necessary to connect a spring to one end of the rollable screen. In this way, when the other end of the rollable screen moves, the rollable screen is always subjected to the elastic force applied by the spring to keep the surface of the rollable screen tensioned, thereby ensuring the display effect of the rollable screen. For example, the Chinese patent with publication number CN114979330A discloses an electronic device. The electronic device includes: a first frame; a second frame capable of moving relative to the first frame; a flexible screen, wherein the first end of the flexible screen is connected to the first frame; a rotating shaft, connected to the second frame, and the second end of the flexible screen passes around the rotating shaft; a pulley assembly, which is arranged on the first frame; a connecting member, wherein the first end of the connecting member is connected to the first frame, and the second end of the connecting member passes around the pulley assembly; an elastic member, wherein the first end of the elastic member is connected to the second end of the flexible screen, and the second end of the elastic member is connected to the second end of the connecting member; wherein, during the movement of the second frame relative to the first frame, the pulley assembly moves with the second frame, and the connecting member moves around the pulley assembly to keep the length of the elastic member unchanged.

[0004] However, in actual use, the prior art uses a spring as a tensioner to keep the screen surface taut, and the length of the spring cannot be precisely controlled. Any external force may cause the spring to change and cause fluctuations in elastic force, which not only makes the screen unable to remain taut and become loose, or the screen is damaged due to excessive force, resulting in poor reliability, but also in the process of rolling up the screen, it is impossible to accurately keep the two ends of the screen moving synchronously, affecting the texture of the rolling up screen. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved fork arm retractable roll-up screen electronic device.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A fork arm retractable and expandable rolling screen electronic device, which includes a fork arm unit and a rolling screen unit, wherein the fork arm unit includes a fork arm assembly and a power device, the rolling screen unit includes a curler, a rolling screen wound on the curler, the rolling screen is connected to the fork arm assembly from both ends and retracts and expands synchronously with the fork arm, the fork arm assembly includes a reference seat and a movable seat that move relative to each other along the retraction and expansion direction of the rolling screen, a first fork arm and a second fork arm that are rotatably connected from a pivot end and can relatively move closer or open to retract and expand, wherein a guide groove extending along the width direction of the rolling screen is formed on the movable seat, the first fork arm and the second fork arm are respectively connected with the two ends of the rolling screen from the connecting end, the curler is installed on the movable seat, the power device is arranged on the reference seat or the movable seat and acts on the first fork arm or the second fork arm, and drives the retraction and expansion of the first fork arm and the second fork arm to drive the pivot end to slide in the guide groove, and the rolling screen retracts and expands synchronously with the movement of the movable seat relative to the reference seat and the movement guide formed by the curler.

[0008] According to a specific embodiment and preferred aspect of the present invention, the first fork arm and the second fork arm move between 0 and 90 degrees, and the angle formed by the first fork arm and the width direction of the rolling screen is ∠1, and the angle formed by the second fork arm and the width direction of the rolling screen is ∠2, wherein ∠1=∠2. Here, it is ensured that both ends of the rolling screen move along the same straight line direction.

[0009] According to another specific embodiment and preferred aspect of the present invention, the first fork arm is a reference fork arm, and the self-joined end is mounted on the reference seat; the second fork arm is a movable fork arm, and the joined end reciprocates along the direction of the rolling screen to form a free end, and the two ends of the rolling screen are fixedly connected to the reference seat and the free end respectively. Here, the structure is simple, and it is easy to install and implement.

[0010] Preferably, the power device is mounted on the reference seat and acts on the first fork arm to drive the first fork arm to rotate around its own connecting end.

[0011] Preferably, the two ends of the rolling screen are a reference end and a moving end, respectively. The reference end is fixed on the reference seat, and the moving end bypasses the curler and is hidden in a closed space formed by the reference seat, the moving seat and the exposed part of the rolling screen. The moving end is fixed to the free end of the second fork arm, and the closed space is synchronously reduced or increased with the expansion and contraction of the rolling screen. Here, the closed space is formed by the reference seat, the moving seat and the exposed part of the rolling screen to accommodate the hidden part of the rolling screen, and the closed space is synchronously reduced or increased with the change of the hidden part of the rolling screen.

[0012] Specifically, the reference seat includes a reference end fixedly connected to the reference end, a reference frame installed on the reference end, and an inner shield installed on the reference end; the mobile seat includes a seat body, a mobile frame installed on the seat body, wherein the curler is installed on the mobile frame, the mobile frame and the reference frame are relatively slidably connected, and the inner shield fits the inner wall of the seat body and forms a synchronous movement guide for the seat body and the mobile frame. Here, the structure is compact and stable, which effectively improves the smoothness of the movement of the mobile seat relative to the reference seat and optimizes the user experience.

[0013] Preferably, the curling device comprises a curling roller extending along the width direction of the curling screen and freely rotatably mounted on the movable seat, wherein there is at least one curling roller, the curling screen is attached to the curling roller, and the two ends of the curling screen are respectively moved and retracted along the tangent direction of the curling roller. In some specific embodiments, the curling roller can be one or more and coaxially arranged.

[0014] Preferably, the seat body includes a seat bottom plate, side plates located on opposite sides of the seat bottom plate, and a guide module connected to the seat bottom plate and the side plates to form a receiving and guiding curling screen, wherein the guide module has an arc-shaped guide surface matching the curling roller and a slope guide surface extending inward from the arc-shaped guide surface. Here, through the cooperation of the guide module and the curler, the curling screen sequentially extends into the closed space along the arc-shaped guide surface and the slope guide surface, which not only realizes receiving and guiding the curling screen, but also facilitates the layout of the first fork arm and the second fork arm in the closed space, so as to facilitate installation and implementation.

[0015] According to another specific embodiment and preferred aspect of the present invention, there are two first forks and two second forks, wherein the two first forks are connected to each other by transmission from the connecting end, the free ends of the two second forks are connected to rotate relative to each other, each first fork and the second fork are pivoted to form a first pivot end and a second pivot end, the guide groove is a first guide groove and a second guide groove whose two center lines are relatively coincident, the first pivot end and the second pivot end slide in the first guide groove and the second guide groove respectively, and the curling screen is synchronously retracted and extended during the relative movement of the first pivot end and the second pivot end. Here, two sets of first and second forks are used to enhance the support of the fork arm assembly.

[0016] Preferably, an elbow is formed at the pivot end of each first fork arm and the second fork arm, and the elbow is connected by a pivot to form the first pivot end and the second pivot end. When the roll-up screen is in the retracted state, the two first forks and the second fork arms and the elbow form a rectangle, wherein the two first forks are relatively flattened to form one long side of the rectangle, and the two second forks are relatively flattened to form the other long side of the rectangle, and the center line of the rectangle and the center line of the guide groove overlap and extend along the width direction of the roll-up screen. Here, the two first and second forks are evenly stressed, deformation is reduced, and the service life is extended.

[0017] Preferably, the connecting ends of the two first forks are matched by gear transmission, and the free ends of the two second forks are connected by an external module, wherein the external module is fixedly connected to the moving end of the rolling screen. In some specific embodiments, the free ends of the two second forks are also engaged by teeth to achieve synchronization of movement.

[0018] Specifically, correspondingly matching meshing teeth are respectively provided at the connecting ends of the two first fork arms, and the power device includes a power module coaxially connected to an meshing tooth and a power source for driving the power module to rotate forward and reversely, wherein the power module is circumferentially provided with power teeth, and the power source includes a power worm gear matching the power teeth.

[0019] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] The existing technology uses a spring as a tensioner to keep the screen surface taut, but the length of the spring cannot be precisely controlled. Any external force may cause the spring to change and cause fluctuations in elastic force, which not only makes the screen unable to remain taut and become loose, or the screen is damaged due to excessive force, resulting in poor reliability, but also in the process of rolling up the screen, it is impossible to accurately keep the two ends of the screen moving synchronously, affecting the texture of the rolling up and down screen. The present application makes an overall design for the structure of the fork-arm retractable and extendable roll-up screen electronic device, ingeniously solving the deficiencies and defects of the prior art. After adopting the roll-up screen electronic device, the two ends of the roll-up screen are respectively connected to the connecting ends of the first and second forks. When unfolding, the power device drives the first and second forks to open relative to each other to drive the pivotal ends to slide in the guide grooves on the moving seat, and the moving seat moves away from the reference seat accordingly. The roll-up screen is synchronously unfolded as the moving seat moves relative to the reference seat and the motion guide formed by the curler; when folding, the power device drives the first and second forks to move closer to each other to drive the pivotal ends to slide in the guide grooves on the moving seat accordingly. The moving seat approaches the reference seat accordingly. The roll-up screen is synchronously folded as the moving seat moves relative to the reference seat and the motion guide formed by the curler. Therefore, compared with the prior art, the present invention, on the one hand, is based on the retraction and extension movement of the first and second fork arms, and realizes the synchronous retraction and extension of the curling screen through the relative movement of the moving seat and the reference seat and the motion guide formed by the curling device, which effectively improves the stability of the force on the surface of the curling screen and has strong reliability; on the other hand, during the retraction and extension process, it can ensure the precise and synchronous movement of the two ends of the curling screen, optimize the retraction and extension texture of the curling screen, and effectively improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the fork arm retractable roll-up screen electronic device of the present invention (in the unfolded state);

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the fork arm retractable roll-up screen electronic device of the present invention (in the unfolded state, the roll-up screen is omitted);

[0024] Figure 3 for Figure 2 Schematic diagram of structural decomposition;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the fork arm retractable roll-up screen electronic device of the present invention (in the retracted state, the roll-up screen is omitted);

[0026] Figure 5 It is a half-section schematic diagram of the fork arm retractable roll-up screen electronic device of the present invention (in unfolded state);

[0027] Figure 6 It is a half-section schematic diagram of the fork arm retractable roll-up screen electronic device of the present invention (folded state);

[0028] Wherein: 1, fork arm unit; 10, fork arm assembly; 101, reference seat; a0, reference end; a1, reference frame; a2, inner shield; 102, movable seat; b0, seat body; b01, seat bottom plate; b02, side plate; b03, guide module; m1, arc guide surface; m2, slope guide surface; b1, movable frame; c1, first guide groove; c2, second guide groove; 103, first fork arm; 104, second fork arm; d11, first pivot end; d12, second pivot end; d2, connecting end; k, external module; 11, power device; 110, power module; 111, power source;

[0029] 2. Curling screen unit; 20. Curler; 200. Curling roller; 21. Curling screen. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] like Figures 1 to 6 As shown, the fork arm retractable roll-up screen electronic device involved in this embodiment includes a fork arm unit 1 and a roll-up screen unit 2.

[0036] Specifically, the fork arm unit 1 includes a fork arm assembly 10 and a power device 11; the curling screen unit 2 includes a curler 20, a curling screen 21 wound on the curler 20 and having two ends respectively as a reference end and a moving end, wherein the curling screen 21 is connected to the fork arm assembly 10 from both ends and itself retracts and extends synchronously with the fork arm.

[0037] In this example, the fork arm assembly 10 includes a reference seat 101 and a movable seat 102 which move relative to each other along the direction of contraction and expansion of the curling screen 21, a first fork arm 103 and a second fork arm 104 which are rotatably connected from the pivot end and can relatively move closer or open to contract and expand, wherein a guide groove extending along the width direction of the curling screen 21 is formed on the movable seat 102, and the first fork arm 103 and the second fork arm 104 are respectively connected to the two ends of the curling screen 21 from the connecting end d2, and the power device 11 is set on the reference seat 101 or the movable seat 102 and acts on the first fork arm 103 or the second fork arm 104, and drives the first fork arm 103 and the second fork arm 104 to contract and expand to drive the pivot end to slide in the guide groove.

[0038] In some specific embodiments, the reference seat 101 includes a reference end a0, a reference frame a1 mounted on the reference end a0, and an inner shield a2 mounted on the reference end a0; the mobile seat 102 includes a seat body b0, and a mobile frame b1 mounted on the seat body b0, wherein the mobile frame b0 and the reference frame a1 are relatively slidably connected, and the inner shield a2 fits the inner wall of the seat body b0 and forms a guide for the synchronous movement of the seat body b0 and the mobile frame b1. The inner walls of the seat body b0 on opposite sides form a slide groove, and the reference frame a1 is correspondingly slidably connected in the slide groove from opposite sides.

[0039] At the same time, the first fork arm 103 is defined as a reference fork arm, and the self-connecting end d2 is installed on the reference seat 101; the second fork arm 104 is a movable fork arm, and the connecting end d2 moves back and forth along the contraction and expansion direction of the curling screen 21 to form a free end; the power device 11 is installed on the reference seat 101, and acts on the first fork arm 103 to drive the first fork arm 103 to rotate around its own connecting end d2; the first fork arm 103 and the second fork arm 104 move between 0~90°, and the angle formed by the first fork arm 103 and the width direction of the curling screen 21 is ∠1, and the angle formed by the second fork arm 104 and the width direction of the curling screen 21 is ∠2, wherein ∠1=∠2.

[0040] For the convenience of implementation, the first fork arm 103 and the second fork arm 104 are each provided with two, wherein the two first fork arms 103 are transmission-connected with each other from the connecting end d2, and the free ends of the two second fork arms 104 are relatively rotationally connected, and each of the first fork arms 103 and the second fork arm 104 is pivotally connected to form a first pivot end d11 and a second pivot end d12, and the guide groove is a first guide groove c1 and a second guide groove c2 whose center lines are relatively coincident, and the first pivot end d11 and the second pivot end d12 slide in the first guide groove c1 and the second guide groove c2 respectively, and the curling screen 21 is synchronously retracted and extended in the relative movement of the first pivot end d11 and the second pivot end d12; an elbow is formed at the pivot end of each of the first fork arms 103 and the second fork arm 104, and a pivot is formed from the elbow to the second fork arm 103 and the second fork arm 104. The first and second pivotal ends d11 and d12 are connected to form a first pivotal end d11 and a second pivotal end d12. When the roll-up screen 21 is in the retracted state, the two first forks 103, the second forks 104 and the elbow form a rectangle, wherein the two first forks 103 are relatively flattened to form one long side of the rectangle, and the two second forks 104 are relatively flattened to form the other long side of the rectangle, and the center line of the rectangle and the center line of the guide groove coincide and extend along the width direction of the roll-up screen 21; the connecting end d2 of the two first forks 103 is matched by gear transmission, and the free ends of the two second forks 104 are connected through an external module k, wherein the external module k is composed of two parts, one of which is connected to the free ends of the two second forks 104, and the other part extends along the width direction of the roll-up screen and is fixedly connected to the moving end of the roll-up screen. In some specific embodiments, the free ends of the two second forks 104 are also engaged with teeth to achieve synchronization of movement.

[0041] Relatively matching engaging teeth are provided at the connecting end portions d2 of the two first fork arms 103. The power device 11 is arranged on the reference seat 101 and includes a power module 110 coaxially connected to an engaging tooth and a power source 111 for driving the power module 110 to rotate forward and reversely, wherein the power module 110 is circumferentially provided with power teeth, and the power source 111 includes a power worm gear matching the power teeth.

[0042] In this example, the curler 20 is installed on the moving seat 102, and the curling screen 21 is synchronously retracted and extended as the moving seat 102 moves relative to the reference seat 101 and is guided by the movement of the curler 20; the two ends of the curling screen 21 are fixedly connected to the reference seat 101 and the free end respectively.

[0043] In some specific embodiments, the curler 20 is mounted on the mobile frame b1, and the curler 20 includes a curling roller 200 extending along the width direction of the curling screen 21 and freely rotatably mounted on the mobile seat 102, wherein there is at least one curling roller 200, the curling screen 21 is attached to the curling roller 200, and the two ends of the curling screen 21 are respectively moved and retracted along the tangent direction of the curling roller 200. In some specific embodiments, the curling roller 200 can be one, or multiple and coaxially arranged.

[0044] The reference end of the rolling screen 21 is fixed on the reference seat 101, the moving end of the rolling screen 21 bypasses the curler 20 and is hidden in the closed space formed by the reference seat 101, the moving seat 102 and the exposed part of the rolling screen 21, and the moving end of the rolling screen 21 is fixed to the free end of the second fork arm 104. Further, the moving end of the rolling screen 21 is fixedly connected to the external module k connected to the free end of the second fork arm 104, and the closed space is synchronously reduced or increased with the expansion and contraction of the rolling screen 21. The closed space is formed by using the reference seat, the moving seat and the exposed part of the rolling screen to accommodate the hidden part of the rolling screen, and the closed space is synchronously reduced or increased with the change of the hidden part of the rolling screen.

[0045] In order to further facilitate the implementation, the seat body b0 includes a seat bottom plate b01, side plates b02 located on opposite sides of the seat bottom plate b01, and a guide module b03 connected with the seat bottom plate b01 and the side plates b02 to form a receiving and guiding curling screen, wherein the guide module b03 has an arc-shaped guide surface m1 matching the curling roller 200, and a slope guide surface m2 extending inward from the arc-shaped guide surface m1. Here, through the cooperation of the guide module and the curler, the curling screen sequentially extends into the closed space along the arc-shaped guide surface and the slope guide surface, which not only realizes receiving and guiding the curling screen, but also facilitates the layout of the first fork arm and the second fork arm in the closed space, so as to facilitate installation and implementation.

[0046] In summary, after adopting the roll-up screen electronic device, the two ends of the roll-up screen are connected to the connecting ends of the first and second forks respectively. When unfolding, the power device drives the first and second forks to open relative to each other to drive the pivotal ends to slide in the guide grooves on the moving seat, and the moving seat moves away from the reference seat accordingly. The roll-up screen is synchronously unfolded as the moving seat moves relative to the reference seat and the motion guide formed by the curler; when folding, the power device drives the first and second forks to move closer to each other to drive the pivotal ends to slide in the guide grooves on the moving seat in the opposite direction, and the moving seat approaches the reference seat accordingly. The roll-up screen is synchronously folded as the moving seat moves relative to the reference seat and the motion guide formed by the curler. Therefore, compared with the prior art, the present invention, on the one hand, is based on the retraction and extension movement of the first and second fork arms, and realizes the synchronous retraction and extension of the curling screen through the relative movement of the moving seat and the reference seat and the movement guide formed by the curling device, which effectively improves the stability of the force on the surface of the curling screen and has strong reliability; on the other hand, it can ensure the precise and synchronous movement of the two ends of the curling screen during the retraction and extension process, optimize the retraction and extension texture of the curling screen, and effectively improve the user experience; thirdly, a closed space is formed by using the reference seat, the moving seat and the exposed part of the curling screen to accommodate the hidden part of the curling screen, and at the same time, the closed space is synchronously reduced or increased as the hidden part of the curling screen changes. Large; fourthly, the structural layout of the reference seat and the movable seat of the present application is compact and stable, which effectively improves the smoothness of the movement of the movable seat relative to the reference seat and optimizes the user experience; fifthly, through the cooperation of the guide module and the curler, the curling screen extends into the closed space along the arc guide surface and the slope guide surface in turn, which not only realizes the reception and guidance of the curling screen, but also is beneficial to the layout of the first fork arm and the second fork arm in the closed space, so as to facilitate installation and implementation; sixthly, two groups of first and second forks are adopted to enhance the support of the fork arm assembly, and the two first and second forks are evenly stressed, which reduces deformation and prolongs the service life.

[0047] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A fork arm retractable roll-up screen electronic device, comprising a fork arm unit and a roll-up screen unit, wherein the fork arm unit comprises a fork arm assembly and a power device, the roll-up screen unit comprises a roll-up device and a roll-up screen wound on the roll-up device, the roll-up screen is connected to the fork arm assembly from both ends and retracts and extends synchronously with the fork arm assembly, characterized in that: The fork arm assembly comprises a reference seat and a moving seat which move relatively along the direction of the retraction and expansion of the rolling screen, a first fork arm and a second fork arm which are rotatably connected from the pivot end and can be relatively brought together or opened to move and retract, wherein the moving seat is formed with a guide groove extending along the width direction of the rolling screen, the first fork arm and the second fork arm are respectively connected with the two ends of the rolling screen from the connecting end, the curler is installed on the moving seat, the power device is arranged on the reference seat or the moving seat and acts on the first fork arm or the second fork arm, and drives the retraction and expansion of the first fork arm and the second fork arm to drive the pivot end to slide in the guide groove, and the rolling screen is synchronously retracted and expanded with the movement of the moving seat relative to the reference seat and the movement guide formed by the curler; There are two of each of the first fork arms and the second fork arms, wherein the two first fork arms are connected to each other by transmission from the connecting ends, and the free ends of the two second fork arms are connected to rotate relative to each other, and each of the first fork arms and the second fork arms is pivoted to form a first pivot end and a second pivot end, and the guide groove is a first guide groove and a second guide groove whose two center lines are relatively coincident, and the first pivot end and the second pivot end slide in the first guide groove and the second guide groove respectively, and the curling screen is synchronously retracted and extended during the relative movement of the first pivot end and the second pivot end; An elbow is formed at the pivotal end of each of the first fork arms and the second fork arms, and the elbow is connected by a pivot to form the first pivotal end and the second pivotal end. When the roll-up screen is in a retracted state, the two first fork arms, the second fork arms and the elbow form a rectangle, wherein the two first fork arms are relatively flattened to form one long side of the rectangle, and the two second fork arms are relatively flattened to form the other long side of the rectangle, and the center line of the rectangle and the center line of the guide groove coincide and extend along the width direction of the roll-up screen.

2. The fork arm retractable roll-up screen electronic device according to claim 1, characterized in that: The first fork arm and the second fork arm move between 0 and 90 degrees, and the angle formed by the first fork arm and the width direction of the curling screen is ∠1, and the angle formed by the second fork arm and the width direction of the curling screen is ∠2, wherein ∠1=∠2.

3. The fork arm retractable roll-up screen electronic device according to claim 1, characterized in that: The first fork arm is a reference fork arm, and the self-connecting end is installed on the reference seat; the second fork arm is a movable fork arm, and the connecting end reciprocates along the contraction and expansion direction of the curling screen to form a free end, and the two ends of the curling screen are fixedly connected to the reference seat and the free end respectively.

4. The fork arm retractable roll-up screen electronic device according to claim 3, characterized in that: The power device is installed on the reference seat and acts on the first fork arm to drive the first fork arm to rotate around its own connecting end.

5. The fork arm retractable roll-up screen electronic device according to claim 3, characterized in that: The two ends of the curling screen are respectively a reference end and a moving end, the reference end is fixed on the reference seat, the moving end bypasses the curler and is hidden in a closed space formed by the reference seat, the moving seat and the exposed part of the curling screen, and the moving end is fixed to the free end of the second fork arm, and the closed space shrinks or expands synchronously with the expansion and contraction of the curling screen.

6. The fork arm retractable roll-up screen electronic device according to claim 5, characterized in that: The reference seat includes a reference end fixedly connected to the reference end, a reference frame installed on the reference end, and an inner shield installed on the reference end; the movable seat includes a seat body and a movable frame installed on the seat body, wherein the curler is installed on the movable frame, the movable frame and the reference frame are relatively slidably connected, and the inner shield fits the inner wall of the seat body and forms a guide for the synchronous movement of the seat body and the movable frame.

7. The fork arm retractable roll-up screen electronic device according to claim 6, characterized in that: The curling device includes a curling roller extending along the width direction of the curling screen and freely rotatably installed on the movable seat, wherein there is at least one curling roller, the curling screen is attached to the curling roller, and the two ends of the curling screen move and expand along the tangent direction of the curling roller respectively.

8. The fork arm retractable roll-up screen electronic device according to claim 7, characterized in that: The seat body includes a seat bottom plate, side plates located on opposite sides of the seat bottom plate, and a guide module connected to the seat bottom plate and the side plates to form a receiving and guiding curling screen, wherein the guide module has an arc-shaped guide surface matching the curling roller and a sloped guide surface extending inward from the arc-shaped guide surface.

9. The fork arm retractable roll-up screen electronic device according to claim 5, characterized in that: The connecting ends of the two first fork arms are matched by gear transmission, and the free ends of the two second fork arms are connected by an external module, wherein the external module is fixedly connected to the moving end of the curling screen.

10. The fork arm retractable roll-up screen electronic device according to claim 9, characterized in that: Relatively matching engaging teeth are provided at the connecting ends of the two first fork arms, and the power device includes a power module coaxially connected to an engaging tooth and a power source driving the power module to rotate forward and reversely, wherein the power module is circumferentially provided with power teeth, and the power source includes a power worm matched with the power teeth.

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