CN215067704U - Projection screen mechanism - Google Patents

Abstract

The application discloses a projection screen mechanism which comprises a cross beam, a rack and a lifting structure, wherein the lifting structure comprises a double-layer fixed hinged support and a double-layer movable hinged support which are arranged in a clamping fork manner, one end of the double-layer fixed hinged support and one end of the double-layer movable hinged support are arranged on the rack at intervals, and the other end of the double-layer fixed hinged support and one end of the double-layer movable hinged support are arranged on the cross beam at intervals; the double-layer fixed hinged support comprises a plurality of double-layer fixed rods hinged in sequence, the double-layer movable hinged support comprises a plurality of double-layer moving rods hinged in sequence, and the adjacent double-layer fixed rods and the double-layer moving rods are arranged in a crossed mode so that the double-layer fixed rods and the double-layer moving rods penetrate into the layer gaps of the opposite side to be matched. The whole thickness of elevation structure is less among this application projection screen curtain mechanism, is convenient for accomodate, transport.

Description

Projection screen mechanism

Technical Field

The application relates to the technical field of projection, in particular to a projection screen mechanism.

Background

The projection screen can improve the display effect of the projector, is an indispensable part in the projection system, and receives more and more attention along with the expansion of the size of the projection screen. The projection screen comprises an electric curtain (fixed at the upper end and unfolded from top to bottom), a floor-pulling curtain, an electric lifting curtain (fixed at the bottom and unfolded from bottom to top) and the like.

In the process of unfolding the projection screen, a lifting structure is required for supporting, however, the conventional lifting structure has a relatively large volume and a relatively heavy weight, so that the whole projection screen mechanism has a relatively large volume and a relatively heavy weight.

SUMMERY OF THE UTILITY MODEL

The application provides a projection screen mechanism to solve current projection screen and need the great and heavier elevation structure of weight of volume to support, the screen side can't be taut, and lead to the whole relatively big, relatively heavier problem of volume of projection screen mechanism.

In order to solve the above technical problem, the present application provides a projection screen mechanism, including: the beam is used for connecting one end of the screen; the frame is arranged at the other end of the screen; the lifting structure comprises a double-layer fixed hinged support and a double-layer movable hinged support, wherein the double-layer fixed hinged support and the double-layer movable hinged support are arranged on the clamping fork, one end of the double-layer fixed hinged support and one end of the double-layer movable hinged support are arranged on the rack at intervals, and the other end of the double-layer fixed hinged support and the other end of the double-layer movable hinged support are arranged on the cross beam at intervals; the double-layer fixed hinged support comprises a plurality of double-layer fixed rods which are sequentially hinged, the double-layer movable hinged support comprises a plurality of double-layer movable rods which are sequentially hinged, and the adjacent double-layer fixed rods and the double-layer movable rods are arranged in a crossed manner so that the double-layer fixed rods and the double-layer movable rods penetrate into the layer gaps of the other side to be matched; wherein the lifting structure is unfolded to lift the screen; the lifting structure is folded, one layer of the double-layer fixed rod in the lifting structure is inserted into the double-layer fixed rod or the double-layer movable rod, and the other layer of the double-layer movable rod is inserted into the double-layer movable rod or the double-layer fixed rod.

Wherein, two ends of the double-layer fixed hinged support are oppositely arranged, one end is hinged with the rack, and the other end is hinged with the cross beam; two ends of the double-layer movable hinged support are oppositely arranged, one end of the double-layer movable hinged support slides on the rack, and the other end of the double-layer movable hinged support slides on the cross beam; wherein the double-layer movable hinged support is glided on the frame or the cross beam to enable the lifting structure to be unfolded or folded.

Wherein, at least one connecting piece is arranged between the fixing rods which are arranged in parallel; at least one connecting piece is arranged between the moving rods which are arranged in parallel.

The projection screen mechanism comprises a side supporting structure, and the side supporting structure is arranged on the lifting structure and is positioned on at least one side of the screen to support the screen.

The side supporting structure comprises a folding rod assembly and a supporting assembly, wherein the folding rod assembly is arranged on the lifting structure and moves synchronously with the lifting structure; the support assembly is disposed on a side of the folding bar assembly adjacent to the screen 9.

Wherein, the folding rod subassembly includes the folding leg, the folding leg includes articulated first folding rod and last folding rod, first folding rod articulates in the one end that double-deck fixed hinge support or double-deck removal hinge support are close to the crossbeam, last folding rod articulates in the one end that double-deck fixed hinge support or double-deck removal hinge support are close to the frame, the folding leg sets up with double-deck fixed hinge support isomorphism, supporting component one end is articulated with the articulated position department of folding leg or double-deck removal hinge support, other end relative elevation structure or folding leg articulated position department slide.

The support assembly comprises at least one horizontal support rod, and one side of the horizontal support rod, which is far away from the screen, is hinged with the folding frame or the double-layer movable hinge support; the hinge joint of the double-layer fixed hinge support and the double-layer movable hinge support or the folding frame slides in the other side of the horizontal support rod.

Wherein, the horizontal support bar is provided with a guide way, and the hinged part or the folding leg between the double-layer fixed hinged support and the double-layer movable hinged support slides in the guide way.

The side supporting structure comprises a stay wire assembly, the stay wire assembly comprises at least two stay wires and a take-up assembly, at least one stay wire is connected to two sides of the screen, and the stay wires are wound on the outer peripheral side of the supporting assembly and connected to the take-up assembly so as to stretch the stay wires and tighten the supporting assembly.

Wherein, the support component is close to the one end of screen side and has seted up the line hole, and the line of acting as go-between wears to establish the line hole and is connected with receiving line subassembly.

Wherein, side bearing structure includes the direction subassembly, and the acting as go-between is connected in the direction subassembly to make the acting as go-between switching over or direction.

Wherein, the direction subassembly sets up in the one end that the supporting component is close to the screen side, and the line hole is worn to establish and is connected with the direction subassembly by acting as go-between.

Wherein the guide assembly comprises at least one guide pulley.

The wire take-up component is arranged on the rack and is an active wire take-up driving part or a spring take-up box so as to take up the pull wire.

The projection screen mechanism comprises a winding shaft structure, and the winding shaft structure is connected with the other end, opposite to the cross beam, of the screen to wind the screen.

The winding shaft structure comprises a winding shaft body, a power assembly, two tension control assemblies and two power supports, wherein the two power supports are fixed on two sides of a shaft core of the winding shaft body, and the power assembly and the tension control assemblies are connected and located at any end of the shaft core of the winding shaft body so as to control torque between the power assembly and the winding shaft body.

Wherein, the tension control subassembly includes that first pressure assembly, second compress tightly piece and friction pack, and first pressure assembly and second compress tightly the piece and all set up in the axle core tip of spool body, and the friction pack sets up in the spool body between spool terminal surface and first pressure assembly, spool body in the spool terminal surface and the inboard surface of axle core.

The projection screen mechanism comprises a flexible substrate, the screen comprises a plurality of screen diaphragms, and the screen diaphragms are connected to the flexible substrate.

The beneficial effect of this application is: be different from prior art's condition, this application provides a double-deck fixed articulated support among elevation structure among projection screen curtain mechanism includes that a plurality of is articulated double-deck dead lever in proper order, and double-deck removal articulated support includes that a plurality of is articulated double-deck carriage release lever in proper order, adjacent double-deck dead lever and double-deck carriage release lever cross arrangement to make double-deck dead lever and double-deck carriage release lever penetrate the layer clearance of each other and cooperate. Wherein the lifting structure is unfolded to lift the screen; the lifting structure is folded, one layer of the double-layer fixed rod in the lifting structure is inserted into the double-layer fixed rod or the double-layer movable rod, and the other layer of the double-layer movable rod is inserted into the double-layer movable rod or the double-layer fixed rod. Through above-mentioned mode promptly, the whole thickness of elevation structure is less, is convenient for accomodate and is convenient for carry.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic view of a first embodiment of a projection screen mechanism according to the present application;

FIG. 2 is a schematic view of the projection screen mechanism of FIG. 1 in an extended configuration;

FIG. 3 is a partial schematic view of a lifting mechanism of the projection screen mechanism of FIG. 2;

FIG. 4 is a partial schematic view of the projection screen mechanism of FIG. 2;

FIG. 5 is another partial schematic view of the projection screen mechanism of FIG. 2;

FIG. 6 is a schematic view of a portion of a second construction of a projection screen mechanism according to the present application;

FIG. 7 is a partial schematic view of a take-up reel structure of the projection screen mechanism of FIG. 2;

FIG. 8 is a partial cross-sectional view of FIG. 7;

FIG. 9 is a schematic diagram of a third construction of the projection screen mechanism.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The projection screen mechanism provided by the present invention will be described in detail with reference to the following embodiments.

Referring to fig. 1, 2 and 3, fig. 1 is a schematic view of a first structure of a projection screen mechanism according to the present application; FIG. 2 is a schematic view of the projection screen mechanism of FIG. 1 in an extended configuration;

fig. 3 is a partial schematic view of the lifting structure of the projection screen mechanism of fig. 2.

The projection screen mechanism in this embodiment includes a beam 1 and a frame 2, the beam 1 is used for connecting with one end of a screen 9, and the frame 2 is disposed at the other end of the screen 9. When the screen 9 is unfolded, the beam 1 and the frame 2 are positioned at two opposite ends of the screen 9; when the screen 9 is rolled up, the cross beam 1 is located outside or inside the housing 2.

The projection screen mechanism further comprises a lifting structure 5, wherein the lifting structure 5 is used for driving the screen 9 to be unfolded or folded, namely when the lifting structure 5 is unfolded, the screen 9 is driven to be unfolded; when the lifting structure 5 is stowed, the screen 9 is also stowed. The lifting structure 5 comprises a double-layer fixed hinged support 511 and a double-layer movable hinged support 512, wherein the double-layer fixed hinged support 511 and the double-layer movable hinged support 512 are arranged in a clamping fork manner, and the double-layer fixed hinged support 511 and one end of the double-layer movable hinged support 512 are arranged on the rack 2 at intervals, so that the angle between one end of the double-layer fixed hinged support 511 and one end of the double-layer movable hinged support 512 and the rack 2 is formed. The other ends of the double-layer fixed hinged support 511 and the double-layer movable hinged support 512 are arranged on the beam 1 at intervals, so that the other ends of the double-layer fixed hinged support 511 and the double-layer movable hinged support 512 are arranged at an angle with the beam 1.

When the lifting structure 5 is subjected to an external force, the angles between the two ends of the double-layer fixed hinge bracket 511 and the double-layer movable hinge bracket 512 and the frame 2 or the beam 1 can be changed, so that the screen 9 is in an unfolded or folded state. If the angles between the double-layer fixed hinged support 511 and the double-layer movable hinged support 512 and the rack 2 are gradually increased, the lifting structure 5 is in an unfolded state; meanwhile, when the angles between the two-layer fixed hinge bracket 511 and the two-layer movable hinge bracket 512 and the frame 2 are gradually decreased, the lifting structure 5 is in the retracted state. Similarly, when the angles between the other ends of the double-layer fixed hinge support 511 and the double-layer movable hinge support 512 and the beam 1 are gradually increased, the lifting structure 5 is in the unfolded state; meanwhile, when the angles of the other ends of the double-layer fixed hinge bracket 511 and the double-layer movable hinge bracket 512 and the cross beam 1 are gradually reduced, the lifting structure 5 is in the retracted state.

In this embodiment, the double-layer fixed hinge bracket 511 includes a plurality of double-layer fixed rods 5111 sequentially hinged, the double-layer movable hinge bracket 512 includes a plurality of double-layer movable rods 5121 sequentially hinged, and the adjacent double-layer fixed rods 5111 and the adjacent double-layer movable rods 5121 are arranged in a crossing manner. Wherein, double-deck fixed articulated support 511 and double-deck removal articulated support 512 are the bilayer structure design, and design gappedly between the bilayer structure to make double-deck dead lever 5111 and double-deck carriage release lever 5121 can penetrate the hole of the bilayer structure of other side each other and cooperate, so that the fork setting between adjacent dead lever 5111 and the carriage release lever 5121 constitutes the elevation structure 5 of similar X-shaped scissors form.

When the lifting structure 5 is unfolded, the screen 9 can be driven to rise; when the lifting structure 5 is folded, one layer of the double-layer fixing rod 5111 in the lifting structure 5 is inserted into the double-layer fixing rod 5111 or the double-layer moving rod 5121, and one layer of the double-layer moving rod 5121 is inserted into the double-layer moving rod 5121 or the double-layer fixing rod 5111, so that after the lifting structure 5 is folded, the whole thickness of the lifting structure 5 is smaller, and the whole weight of the projection screen mechanism is further reduced; simultaneously, make elevation structure 5 can accomodate and form littleer volume, the transport of being convenient for.

During the unfolding or folding process of the lifting structure 5, the hinge positions of the double-layer fixed hinge bracket 511 and/or the double-layer movable hinge bracket 512 may be driven, so that the lifting structure 5 can be unfolded or folded by changing the hinge positions. In addition, one end of the double-layer fixed hinge support 511 can be driven to move relative to the frame 2, and the other end of the double-layer fixed hinge support 511 can move relative to the cross beam 1, so that the lifting structure 5 can be unfolded or folded; one end of the double-layer movable hinge support 512 can be driven to move relative to the machine frame 2, and the other end of the double-layer movable hinge support 512 can be driven to move relative to the cross beam 1, so that the lifting structure 5 can be unfolded or folded. The frame 2 is disposed in the housing 100, and when the lifting structure 5 is retracted, the lifting structure 5 can be hidden in the housing 100, which not only facilitates transportation, but also improves the aesthetic property of the projection screen mechanism.

In this embodiment, the two ends of the double-layer movable hinge support 512 move relative to the frame 2 and the beam 1 respectively. The method comprises the following specific steps: two ends of the double-layer fixed hinged support 511 are oppositely arranged, one end of the double-layer fixed hinged support 511 is hinged to the rack 2, and the other end of the double-layer fixed hinged support 511 is hinged to the cross beam 1. The two ends of the double-layer movable hinged support 512 are oppositely arranged, one end of the double-layer movable hinged support 512 slides on the rack 2, and the other end slides on the beam 1. Namely, the double-layer movable hinged support 512 slides on the machine frame 2 or the cross beam 1 to enable the lifting structure 5 to move up and down. Through the mode, the lifting structure 5 is convenient to drive to unfold or fold, and the structure is simple and easy to assemble.

For example, as shown in fig. 2, two ends of the double-layer fixed hinge bracket 511 are respectively disposed at the end of the beam 1 and the end of the frame 2, and when one end of the double-layer movable hinge bracket 512 slides to one end of the double-layer fixed hinge bracket 511, an included angle between the double-layer movable hinge bracket 512 and the frame 2 is increased; meanwhile, the double-layer movable hinge support 512 is driven to slide relative to the cross beam 1, so that the included angle between the double-layer movable hinge support 512 and the cross beam 1 is increased, the lifting structure 5 is gradually in an unfolded state, and the screen 9 is driven to be in the unfolded state. When one end of the double-layer movable hinged support 512 is far away from one end of the double-layer fixed hinged support 511 to slide, the included angle between the double-layer movable hinged support 512 and the rack 2 is reduced; meanwhile, the double-layer movable hinge support 512 is driven to slide relative to the cross beam 1, so that the included angle between the double-layer movable hinge support 512 and the cross beam 1 is reduced, and the lifting structure 5 is gradually in a retracted state.

Further, any one of two ends of the double-layer fixed hinged support 511 slides on the frame 2 and the beam 1 through a slide block and slide rail assembly (not shown in the figure); or any one of the two ends of the double-layer movable hinged support 512 slides on the machine frame 2 and the cross beam 1 through the slide block and slide rail assembly. In this embodiment, one end of the double-layer movable hinge support 512 slides on the beam 1 through the slider slide rail, and the other end slides on the frame 2 through the slider slide rail, wherein the horizontal movement is converted into a height change of the lifting structure 5 by driving one end of the double-layer movable hinge support 512 on the frame 2, thereby realizing unfolding or folding.

The screen 9 is a flexible screen and a rollable screen suitable for projection, and may be an electric screen, a floor-pulling screen, an electric lifting screen, a white plastic screen or a glass fiber screen for conventional long-focus projection, or a fresnel screen or a wire grid screen for ultra-short-focus projection, which is not limited herein.

In one embodiment, the lifting structure 5 further includes a plurality of connecting members 513 disposed between the fixing rods 5111 parallel to each other or between the moving rods 5121 parallel to each other, so as to increase the bending rigidity of the lifting structure 5 and improve the lifting structure 5. The positions and the number of the connecting members 513 may be determined according to practical situations and are not limited herein. The number of the lifting structures 5 can be one, two or more, and the number can be determined according to practical situations, and is not limited herein.

However, the above-mentioned lifting structure 5 can only provide up-down tension for the screen 9, for example, the electric curtain is flattened up and down by the gravity of the lower end rod, and the floor-pulling curtain and the electric lifting curtain back support rod support the upper end to provide up-down tension, but there is no tension to the side of the screen 9, which causes the side of the projection screen 9 to have distortion visible to the naked eye, which affects the viewing experience. Therefore, the projection screen mechanism of the present embodiment includes a side support structure (not shown) for providing a supporting force to the side of the screen 9.

Referring to fig. 4 and 5, fig. 4 is a partial schematic view of the projection screen mechanism of fig. 2;

fig. 5 is another partial schematic view of the projection screen mechanism of fig. 2.

Specifically, with reference to fig. 2-3, the side supporting structure is disposed on the lifting structure 5 and located on one side or two sides of the screen 9 to support one side or two sides of the screen 9, so that the side of the screen 9 is flat and the occurrence of warpage and other problems is reduced.

Further, the side supporting structure comprises a folding rod assembly 7 and a supporting assembly 8, wherein the folding rod assembly 7 is arranged on the lifting structure 5 and moves synchronously with the lifting structure 5. When the lifting structure 5 is deployed or stowed, the folding bar assembly 7 can also be deployed or stowed therewith. Wherein the supporting component 8 is connected between the folding rod component 7 and the lifting structure 5, namely, the folding rod component 7 and the lifting structure 5 move synchronously, and then the supporting component 8 is driven to move up and down.

The folding bar assembly 7 provides a mounting bridge for the connection between the lifting structure 5 and the support assembly 8, wherein the overall thickness of the lifting structure 5 is not increased during the unfolding or folding process of the folding bar assembly 7. The specific installation position of the support member 8 depends on the relative position relationship between the folding rod member 7 and the support member 8, and is not limited herein.

Specifically, the folding bar assembly 7 includes a folding bar 71, and the folding bar 71 includes a first folding bar (not shown) and a last folding bar (not shown), wherein the first folding bar and the last folding bar are hinged. The first folding rod is hinged to one end of the double-layer fixed hinge support 511 close to the beam 1 or one end of the double-layer movable hinge support 512 close to the beam, the last folding rod is hinged to one end of the double-layer fixed hinge support 511 close to the rack 2 or one end of the double-layer movable hinge support 512 close to the rack 2, and the middle part of the folding frame 71 is arranged in a shape similar to the double-layer fixed hinge support 511 or the double-layer movable hinge support 512.

Wherein one end of the supporting component 8 can be hinged with the hinged position of the folding frame 71 or hinged with the hinged position of the double-layer movable hinged bracket 512, and the other end thereof can slide relative to the hinged position of the lifting structure 5 or the folding frame 71. When the lifting structure 5 is unfolded or folded, the folding frame 71 can be hinged to one end of the supporting component 8 and can also slide in the other end of the supporting component 8, so that the folding frame 71 can be unfolded or folded along with the lifting structure 5. Meanwhile, the middle hinge part of the folding frame 71 and the hinge positions of the double-layer fixed hinge bracket 511 and the double-layer movable hinge bracket 512 are arranged in the same row, so that the supporting component 8 can be horizontally arranged, that is, the supporting component 8 only moves in the vertical direction and is always in a horizontal state.

Specifically, the folding leg 71 further comprises at least one intermediate folding bar (not shown), and the at least one intermediate folding bar is located between the first folding bar and the last folding bar, wherein the first folding bar, the last folding bar and the intermediate folding bar are sequentially hinged. The number of the middle folding rods can be one, two or more, and the number of the middle folding rods can be determined according to actual conditions. As shown in fig. 2, the right folding leg 71 includes a first folding bar, a last folding bar, and two middle folding bars. Wherein the middle folding rod is arranged in the same row with the double-layer fixed hinged support 511.

In order to simplify the structure, the support assembly 8 in this embodiment includes at least one horizontal support rod 81, wherein the side of the horizontal support rod 81 away from the screen 9 is hinged to the folding frame 71 or the double-layer movable hinge bracket 512. And the other side of the horizontal support bar 81 faces the screen 9 to facilitate sliding and to keep the screen 9 flat.

The number of the horizontal supporting rods 81 can be one, two or more, and the number can be determined according to actual conditions. As in fig. 2, the number of the horizontal support bars 81 is two. In other embodiments, when the number of the horizontal support bars 81 is one, the folding leg 71 may only include a first folding bar and a last folding bar, both of which are hinged to one end of the horizontal support bar 81 near the side of the screen 9, wherein the first folding bar is hinged to one end of the double-layer fixed hinge bracket 511 or the double-layer movable hinge bracket 512 near the cross beam 1, and the last folding bar is hinged to one end of the double-layer fixed hinge bracket 511 or the double-layer movable hinge bracket 512 near the frame 2. Of course, in alternative embodiments, the number of horizontal support bars 81 may be three, four, or more; the number of the middle folding rods can be one, two or more, and the like, and is not limited herein.

Specifically, the horizontal support bar 81 is provided with a guide groove 811, and the guide groove 811 provides a guide function. The hinge or folding leg 71 of the double-deck fixed hinge bracket 511 and the double-deck movable hinge bracket 512 is slidably moved in the guide groove 811 so as to slide along a predetermined path of the guide groove 811. The guide slot 811 may be a slotted hole, the length of the slotted hole defines the sliding distance of the hinge joint of the double-layer movable hinge support 512 or the folding frame 71, and the length may be defined according to practical situations, which is not limited herein.

As shown in fig. 2, three horizontal support rods 81 are provided, one end of the horizontal support rod 81 near the middle of the screen 9 is hinged with the double-layer movable hinge bracket 512, and the other end is slidably moved with the folding bracket 71. One end of the horizontal support bar 81 near the upper end of the screen 9 is hinged with the folding leg 71, and the other end is slidably moved with the hinge between the double-layer movable hinge bracket 512 and the double-layer fixed hinge bracket 511.

With reference to fig. 1-5, the side supporting structure can provide supporting force to the side of the screen 9, however, there may still be a gap between the screen 9 and the side supporting structure, which cannot be fit well, and cannot provide tension to the two sides of the screen 9. Therefore, in order to provide tension to the two sides of the screen 9, the side supporting structure in this embodiment further includes a wire pulling assembly 4, the wire pulling assembly 4 includes at least two wires 41 and a wire collecting assembly 42, and at least one wire 41 is connected to each of the two sides of the screen 9, wherein the wire pulling 41 is wound around the outer periphery of the supporting assembly 8 and connected to the wire collecting assembly 42. When the wire take-up assembly 42 tightens the wire 41, the support assembly 8 and the screen 9 can be bound together, so as to provide tension for the two side edges of the screen 9. When the screen 9 is rolled, the supporting component 8 is folded along with the screen 9, and the pull wire 41 is rolled into the screen by being pulled by the wire rolling component 42. Therefore, the screen 9 and the supporting component 8 are tightly combined together through the mutual matching of the wire pulling component 4 and the supporting component 8, so that the tension force of two side edges of the screen 9 is improved.

For avoiding the problem such as screen 9 side takes place the warpage, consequently 8 sides of supporting component and screen 9 both sides limit can align the setting, after screen 9 both sides limit atress, can the butt on supporting component 8, through supporting component 8 and the cooperation of subassembly 4 of acting as go-between promptly, not only can provide the side tensile force for screen 9, make screen 9 hug closely on supporting component 8 moreover, reduced the clearance between screen 9 and the supporting component 8, the warp deformation of screen 9 side has also been reduced simultaneously, and then the display effect of screen 9 has been improved.

With reference to fig. 1 to 5, specifically, in order to avoid winding between the pull wires 41 or between the pull wires 41 and the lifting structure 5 and the side supporting structure, in this embodiment, a wire hole 812 is formed at one end of the supporting component 8 close to the side of the screen 9, and the pull wires 41 penetrate through the wire hole 812 and are connected to the wire take-up component 42, that is, after the pull wires 41 pass through the supporting component 8, the supporting component 8 can still be pressed onto the screen 9. In order to achieve better tensioning effect, the pull wire 41 is fixedly arranged on the side edge of the screen 9 and just overlapped with one end of the supporting component 8.

No matter the screen 9 is in the unfolding or rolling state, the pull wire 41 is always in the stretched state, so that not only is the tension force provided, but also the screen 9 is prevented from being scratched by the pull wire 41 and the like. Two, three or more pull wires 41 can be respectively arranged on two sides of the back surface of the screen 9, wherein the pull wires 41 have certain toughness. When the plurality of pulling wires 41 are disposed on the rear side of the screen 9, the plurality of pulling wires 41 may be uniformly disposed on the rear side of the screen 9. As shown in fig. 2, three pull wires 41 are disposed on each side of the back of the screen 9, and the three pull wires 41 are uniformly disposed on the side of the back of the screen 9.

The wire drawing unit 4 is configured to constantly keep the wire 41 in a taut state and to store the wire 41. The wire assembly 4 may be of either active or passive construction. The active structure may be an active wire take-up driving member, wherein the active wire take-up driving member may be a motor driving member, and when the pull wire 41 is loosened, the pull wire 41 is wound by rotation of the motor, so that the pull wire 41 is in a tight state.

Referring to fig. 6, fig. 6 is a partial schematic view of a second structure of a projection screen mechanism according to the present application.

The passive structure may be a spring-loaded spool, as shown in fig. 6, wherein the wire takeup member 42 is a spring-loaded spool that uses a clockwork spring to pull the wire 41. When the wire 41 is loosened, the clockwork spring winds the wire 41, thereby keeping the wire 41 taut. The spring winding box adopts a clockwork spring as a winding power source, the center of the clockwork spring is fixed on the box body, and the other end of the clockwork spring is connected with the pull wire 41. Before the spring winding box is installed, the spring is wound up, so that the spring can always provide tension for the pull wire 41 no matter how the pull wire 41 moves. Through above-mentioned spring coiling box promptly, simple structure just saves the cost, need not motor drive. The active wire take-up driving piece and the spring take-up box can be arranged on the rack 2.

Referring to fig. 1 to 6, in particular, since the pulling wire 41 is prevented from being caught or broken due to friction during the pulling process of the pulling wire 41 by the wire rewinding assembly 42, the pulling wire assembly 4 in this embodiment includes a guide assembly 43, wherein the pulling wire 41 is connected to the guide assembly 43, and the guide assembly 43 prevents the pulling wire 41 from being caught by controlling the direction of the pulling wire 41, so as to reverse or guide the pulling wire 41, so that the pulling wire 41 is always in a stretched state. The guiding assembly 43 may be disposed at any position of the projection screen mechanism as long as the direction change or guiding of the stay 41 can be achieved.

Further, the guiding component 43 may be disposed at one end of the supporting component 8 near the side of the screen 9, as shown in fig. 4, the pulling wire 41 is inserted through the wire hole 812 and connected with the guiding component 43 to divert or guide the pulling wire 41. Wherein the guiding component 43 can also be arranged at the position of the frame 2 near the bottom of the screen 9, as shown in fig. 6.

The guiding assembly 43 may be a plurality of guiding pulleys 431, as shown in fig. 4 and 6, the number of the guiding pulleys 431 may be one or more, wherein each guiding pulley 431 may correspond to one pulling wire 41 for respectively diverting or guiding.

Referring to fig. 7 and 8, fig. 7 is a partial schematic view of a take-up reel structure in the projection screen mechanism shown in fig. 2; fig. 8 is a partial cross-sectional view of fig. 7.

In an embodiment, the projection screen mechanism includes a winding shaft structure 6, the winding shaft structure 6 is disposed on the frame 2, wherein the other end of the screen 9 is connected to the winding shaft structure 6, and the winding shaft structure 6 can wind the screen 9 during the rotation process.

Further, the winding shaft structure 6 includes a winding shaft body 61, a power assembly 62, and two power supports 63, the winding shaft body 61 is used for connecting the other end of the screen 9, the two power supports 63 are fixed on two sides of a shaft core of the winding shaft body 61, and the winding shaft body 61 is sleeved on the shaft core, so that the winding shaft body 61 can rotate around the shaft core. The power assembly 62 may be disposed at either end of the reel body 61 to drive the reel body 61 to rotate. Because the lifting structure 5 drives the reel body 61 to rotate through the screen 9, the speed of the screen 9 being unwound is not uniform, and the rotating speed of the power assembly 62 is generally constant, so that there is a rotating speed difference between the power assembly 62 and the core of the reel body 61, the take-up reel structure 6 further includes two tension control assemblies 64, the two tension control assemblies 64 are respectively disposed at two ends of the reel body 61, the tension control assemblies 64 are connected with the power assembly 62 to control the torque between the power assembly 62 and the reel body 61, and at the same time, the stalling of the power assembly 62 can be avoided. The tension control assembly 64 and the power assembly 62 are matched with each other, so that the tension is stable, controllable and adjustable, and meanwhile, the static tension control assembly has a holding force and has no oscillation phenomenon.

The power assembly 62 may be composed of a motor and a reduction gearbox, and is convenient to control; the power assembly 62 may also be powered by an external mechanism via gears and a transmission such as a belt.

Specifically, the tension control assembly 64 includes a first pressing member 641, a second pressing member 642 and a friction member 643, wherein the first pressing member 641 and the second pressing member 642 are disposed at an end of the shaft core of the shaft body 61, so that the first pressing member 641 and the second pressing member 642 are sleeved on the shaft body 61 and pressed against the end of the shaft body 61. Wherein, the friction member 643 is disposed between the end surface of the spool in the spool body 61 and the first pressing member 641, and between the end surface of the spool in the spool body 61 and the inner surface of the shaft core. When the rotation speed difference between the reel and the power assembly 62 exists, the friction member 643 generates sliding friction, the magnitude of the friction force determines the torque magnitude, and the force of the lifting structure 5 is converted into the force of the reel torque through the screen 9 tension, thereby playing the role of controlling the screen 9 tension torque. In this case, the magnitude of the torque is dependent only on the friction coefficient of the friction surface and the pressing force, and is independent of the rotational speed. The tension value can be controlled by adjusting the pressing force by adjusting the second pressing member 642 at the outermost end of the first pressing member 641.

The friction member 643 may be made of materials with different friction coefficients, and the tension control is performed through the friction member 643, which is simple and convenient and does not require additional electrical input. Wherein the second pressing member 642 is a pressing nut or the like. Of course, the tension control assembly 64 may also adjust the tension by adjusting the magnitude of the input current through magnetic powder or electromagnetic force, etc.

Referring to fig. 9, fig. 9 is a schematic diagram of a third structure of the projection screen mechanism.

Referring to fig. 2, in this embodiment, the upper end of the screen 9 is fixed to the beam 1, and the lower end of the screen 9 is wound around the winding shaft structure 6. Taking 100 inches screen 9 as an example, the width of the screen 9 is about 2230mm, the length of the screen 9 should at least ensure 1250mm of the projection area above 1700mm, the rest is the lower part and the length wound on the winding shaft structure 6, the part is shielded by the frame 2 and is not exposed, and the height difference between the complete lifting and the complete winding of the screen 9 should be not less than the length of the projection area. Since it is difficult to achieve the size of the screen 9 itself, such as a fresnel screen, the screen film needs to be cut according to the size of the projection area and fixed on the flexible substrate 10 meeting the above size requirement, and the flexible substrate 10 can be tensioned when stretched. The flexible base material 10 is preferably made of a material having a certain elasticity and a thickness of not more than 0.5mm, such as nylon cloth. The elastic modulus of the material of the flexible substrate 10 is between 1000MPa and 4000 MPa.

The connection mode of the screen film and the flexible base material 10 can be bonding, sewing, hot pressing and the like, preferably adopts a bonding mode, the bonding glue layer is not too thick, and separation is prevented after the winding times are large.

Double-deck fixed hinge support includes a plurality of articulated double-deck dead lever in proper order among the elevation structure in this embodiment projection screen curtain mechanism, and double-deck removal hinge support includes a plurality of articulated double-deck carriage release lever in proper order, and adjacent double-deck dead lever and double-deck carriage release lever cross arrangement to make double-deck dead lever and double-deck carriage release lever penetrate the layer clearance of each other and cooperate. Wherein the lifting structure is unfolded to lift the screen; the lifting structure is folded, one layer of the double-layer fixed rod in the lifting structure is inserted into the double-layer fixed rod or the double-layer movable rod, and the other layer of the double-layer movable rod is inserted into the double-layer movable rod or the double-layer fixed rod. Through above-mentioned mode promptly, the whole thickness of elevation structure is less, is convenient for accomodate and is convenient for carry.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (18)

1. A projection screen mechanism, comprising:

the beam is used for connecting one end of the screen;

the frame is arranged at the other end of the screen;

the lifting structure comprises a double-layer fixed hinged support and a double-layer movable hinged support, wherein the double-layer fixed hinged support and the double-layer movable hinged support are arranged on the clamping fork, one end of the double-layer fixed hinged support and one end of the double-layer movable hinged support are arranged on the rack at intervals, and the other end of the double-layer fixed hinged support and the other end of the double-layer movable hinged support are arranged on the cross beam at intervals; the double-layer fixed hinged support comprises a plurality of double-layer fixed rods which are sequentially hinged, the double-layer movable hinged support comprises a plurality of double-layer movable rods which are sequentially hinged, and the adjacent double-layer fixed rods and the double-layer movable rods are arranged in a crossed mode so that the double-layer fixed rods and the double-layer movable rods penetrate into layer gaps of each other to be matched;

wherein the lifting structure is deployed to raise the screen; the lifting structure is folded, one layer of the double-layer fixed rod in the lifting structure is inserted into the double-layer fixed rod or the double-layer movable rod, and one layer of the double-layer movable rod is inserted into the double-layer movable rod or the double-layer fixed rod.

2. The projection screen mechanism of claim 1, wherein the two fixed hinged brackets are oppositely disposed at opposite ends, one end is hinged to the frame and the other end is hinged to the beam;

two ends of the double-layer movable hinged support are oppositely arranged, one end of the double-layer movable hinged support slides to the rack, and the other end of the double-layer movable hinged support slides to the cross beam; wherein the double-layer movable hinged support is glided on the frame or the cross beam so as to enable the lifting structure to be unfolded or folded.

3. The projection screen mechanism of claim 1, wherein at least one connector is disposed between the fixed rods disposed parallel to each other; at least one connecting piece is arranged between the moving rods which are arranged in parallel.

4. The projection screen mechanism of claim 1, wherein the projection screen mechanism includes a side support structure disposed on the elevating structure and on at least one side of the screen to support the screen.

5. The projection screen mechanism of claim 4, wherein the side support structure includes a folding bar assembly and a support assembly, the folding bar assembly being disposed on the elevating structure in synchronization with movement of the elevating structure; the supporting component is arranged on one side, close to the screen, of the folding rod component.

6. The projection screen mechanism of claim 5, wherein the folding bar assembly includes a folding bar, the folding bar includes a first folding bar and a second folding bar, the first folding bar is hinged to one end of the double-layer fixed hinge support or the double-layer movable hinge support near the cross beam, the second folding bar is hinged to one end of the double-layer fixed hinge support or the double-layer movable hinge support near the frame, the folding bar is disposed in a manner similar to the double-layer fixed hinge support, one end of the support assembly is hinged to a hinge position of the folding bar or the double-layer movable hinge support, and the other end of the support assembly is slidable relative to the lifting structure or the hinge position of the folding bar.

7. The projection screen mechanism of claim 4, wherein the support assembly includes at least one horizontal support rod, a side of the horizontal support rod remote from the screen being hinged to the folding leg or the dual layer moving hinge leg; the hinge joint of the double-layer fixed hinge support and the double-layer movable hinge support or the folding frame slides in the other side of the horizontal support rod.

8. The projection screen mechanism of claim 7, wherein the horizontal support bar is provided with a guide slot, and the hinge between the two fixed hinge brackets and the two movable hinge brackets or the folding leg slides in the guide slot.

9. The projection screen mechanism of claim 4, wherein the side support structure includes a pull wire assembly including at least two pull wires and a take-up assembly, at least one pull wire connected to both sides of the screen, the pull wires connected to the take-up assembly around a peripheral side of the support assembly such that the pull wires stretch and tighten the support assembly.

10. The projection screen mechanism of claim 9, wherein a wire hole is formed at an end of the support member adjacent to the side of the screen, and the pulling wire is inserted through the wire hole and connected to the wire take-up member.

11. The projection screen mechanism of claim 10, wherein the side support structure includes a guide assembly, the pull wire being connected to the guide assembly to reverse or guide the pull wire.

12. The projection screen mechanism of claim 11, wherein the guide member is disposed at an end of the support member adjacent to the side of the screen, and the pull wire is inserted through the wire hole and connected to the guide member.

13. The projection screen mechanism of claim 12, wherein the guide assembly includes at least one guide pulley.

14. The projection screen mechanism of claim 9, wherein the wire retrieving assembly is disposed on the frame and is an active wire retrieving driving member or a spring retrieving box for retrieving the pulling wire.

15. The projection screen mechanism of any of claims 1-14, wherein the projection screen mechanism includes a take-up reel structure coupled to an opposite end of the screen from the beam to take up the screen.

16. The projection screen mechanism of claim 15, wherein the take-up spool structure includes a spool body, a power assembly, two tension control assemblies, and two power mounts secured to opposite sides of a core of the spool body, the power assembly and the tension control assemblies coupled to and positioned at either end of the core of the spool body to control torque between the power assembly and the spool body.

17. The projection screen mechanism of claim 16, wherein the tension control assembly includes a first compression member, a second compression member, and a friction member, wherein the first compression member and the second compression member are each disposed at an end of the core of the spool body, and wherein the friction member is disposed between an end surface of the spool in the spool body and the first compression member, the end surface of the spool in the spool body, and an inner surface of the core.

18. The projection screen mechanism of any of claims 1-14, wherein the projection screen mechanism comprises a flexible substrate, and wherein the screen comprises a plurality of screen membranes, the plurality of screen membranes being attached to the flexible substrate.

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