Projection curtain leveling device

Abstract

The utility model discloses a projection curtain leveling device, which belongs to the technical field of projection curtains and comprises a curtain storage box, a counterweight lever, two opening units and two angle adjusting mechanisms, the two opening units are respectively used for leveling two side edges of a projection curtain, and the angle adjusting mechanisms are used for adjusting the angle of the projection curtain. The opening unit comprises a first connecting rod hinged to the inner wall of the curtain storage box and a second connecting rod hinged to the balance weight lever, and the first connecting rod and the second connecting rod are hinged through a first hinge shaft. According to the utility model, by arranging the two opening units and the two angle adjusting mechanisms, when the roll shaft rotates and the projection curtain is put down, the counterweight rod moves downwards, and the two angle adjusting mechanisms gradually enlarge the included angle between the connecting rod I and the connecting rod II, so that the distance between the upper end of the connecting rod I and the lower end of the connecting rod II is enlarged; therefore, the two side edges of the projection curtain are leveled, and the projection curtain is ensured to be flat.

Description

Technical Field

[0001] This utility model relates to the field of projection screen technology, specifically to a projection screen flattening device. Background Technology

[0002] When a projection screen is unfolded, it may wrinkle or loosen due to its own weight, wind, or other external forces, affecting the projection effect. Therefore, a leveling device is needed to keep the projection screen flat. The conventional method is to fix a counterweight bar at the bottom of the projection screen, but this method cannot maintain stability. When the screen is subjected to airflow or vibration, the counterweight bar will also sway. Therefore, a new projection screen leveling device needs to be designed. Utility Model Content

[0003] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide a projection screen flattening device, which uses two supporting units to support the two sides of the projection screen respectively, thus flattening the projection screen.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a projection screen flattening device, comprising:

[0005] The screen storage box has an open bottom and a rotating roller inside, on which the projection screen is wound.

[0006] The counterweight bar is fixed to the bottom edge of the projection screen;

[0007] Two support units are used to flatten the two sides of the projection screen. Each support unit includes a connecting rod one that is hinged to the inner wall of the screen storage box and a connecting rod two that is hinged to the counterweight rod. The connecting rod one and the connecting rod two are hinged through a hinge shaft one.

[0008] Two angle adjustment mechanisms are respectively installed on the two expansion units to adjust the included angle between connecting rod one and connecting rod two.

[0009] Preferably, the angle adjustment mechanism includes:

[0010] Toothed grooves are formed on the second connecting rod and are distributed around the first hinge shaft.

[0011] Gear 1 is rotatably mounted on one end of connecting rod 1 near connecting rod 2. Gear 1 meshes with toothed teeth. When gear 1 rotates on connecting rod 1, gear 1 drives toothed teeth to rotate around hinge shaft 1.

[0012] Preferably, the curtain storage box is provided with a drive mechanism and two transmission mechanisms, and the drive mechanism drives two gears to rotate through the two transmission mechanisms respectively.

[0013] Preferably, the transmission mechanism includes a first pulley, a second pulley, and a synchronous belt. A second hinge shaft is rotatably installed inside the curtain storage box. The first connecting rod is hinged to the curtain storage box through the second hinge shaft. The first pulley is fixed on the second hinge shaft. The second pulley is fixed on the gear shaft of the first gear. The synchronous belt is wound around the first pulley and the second pulley.

[0014] Preferably, the driving mechanism includes a driving shaft, which is rotatably mounted on the curtain storage box. Two bevel gears are fixed on the driving shaft, and a second bevel gear that meshes with the first bevel gear is fixed on the hinge shaft.

[0015] Preferably, a leveling motor for driving the drive shaft to rotate is fixed outside the curtain storage box.

[0016] Preferably, the two ends of the counterweight rod are threaded with end caps, and a hinge shaft three is fixed on the end caps. The connecting rod two is hinged to the end caps through the hinge shaft three.

[0017] Preferably, a limiting plate is fixed at one end of the first connecting rod near the second connecting rod. When the included angle between the second connecting rod and the first connecting rod reaches its maximum value, the limiting plate abuts against the second connecting rod.

[0018] Preferably, the top of the curtain storage box is fixed with two ear plates, and the ear plates are provided with through holes.

[0019] Preferably, a receiver / discharge motor for driving the roller shaft to rotate is fixed on one side of the curtain storage box.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention utilizes two spreading units and two angle adjustment mechanisms. As the roller rotates and the projection screen is lowered, the counterweight moves downward, and the two angle adjustment mechanisms gradually increase the angle between connecting rod one and connecting rod two, thus increasing the distance between the upper end of connecting rod one and the lower end of connecting rod two. This flattens the two sides of the projection screen, ensuring its smoothness. A leveling motor and a winding / unwinding motor are also included. The winding / unwinding motor controls the rotation of the roller, thereby controlling the winding and unwinding of the projection screen. The leveling motor drives the drive shaft to rotate, which in turn drives the two hinge shafts two to rotate simultaneously via a bevel gear set. This, in turn, uses a synchronous belt transmission mechanism to simultaneously drive the two gears one to rotate, causing the gear teeth to rotate around the hinge shaft one, thus adjusting the angle between connecting rod one and connecting rod two. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A front-view perspective perspective of a projection screen flattening device provided for an embodiment of this utility model.

[0024] Figure 2 A rear-view perspective perspective of a projection screen flattening device provided for an embodiment of this utility model.

[0025] Figure 3 A perspective view of a projection screen flattening device in its stowed state, provided as an embodiment of this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the supporting unit in this utility model.

[0027] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0028] Figure 6 for Figure 4 A magnified view of a section at point B.

[0029] Figure 7 for Figure 4 A magnified view of a section at point C.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Screen storage box; 2. Roller shaft; 3. Projection screen; 4. Counterweight rod; 5. Linkage rod one; 6. Linkage rod two; 7. Hinge shaft one; 8. Gear teeth; 9. Gear one; 10. Pulley one; 11. Pulley two; 12. Synchronous belt; 13. Hinge shaft two; 14. Drive shaft; 15. Bevel gear one; 16. Bevel gear two; 17. Leveling motor; 18. End cap; 19. Limiting plate; 20. Ear plate; 21. Retractor / discharge motor. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1:

[0034] like Figures 1 to 7 As shown, Embodiment 1 of this utility model provides a projection screen 3 flattening device, including a screen storage box 1, a counterweight rod 4, two opening units, and two angle adjustment mechanisms. The opening units cooperate with the angle adjustment mechanisms to ensure that the projection screen 3 is unfolded flat. First, the screen storage box 1 is rectangular with an open bottom. The roller 2 installed inside is rotatable, and the projection screen 3 is wound around the roller 2. When the projection screen 3 needs to be used, the rewind motor 21 fixed on one side of the screen storage box 1 is activated, driving the roller 2 to rotate, so that the projection screen 3 is unrolled downwards. The counterweight rod 4 fixed to the bottom edge of the projection screen 3 moves downwards as the projection screen 3 is unrolled.

[0035] Two extension units flatten the two sides of the projection screen 3. Each extension unit includes a first connecting rod 5 and a second connecting rod 6. The first connecting rod 5 is hinged to the inner wall of the screen storage box 1 via a second hinge shaft 13. The second connecting rod 6 is hinged to an end cap 18 threaded onto the end of the counterweight rod 4 via a third hinge shaft. The first connecting rod 5 and the second connecting rod 6 are hinged together via a first hinge shaft 7. The third hinge shaft is fixed to the end cap 18, while both the second hinge shaft 13 and the first hinge shaft 7 are rotatable.

[0036] With the above setup, when the projection screen 3 is lowered, the counterweight 4 descends and drives the lower end of the second connecting rod 6 downwards, gradually opening the connecting rod 5 and the second connecting rod 6 from their retracted state. To actively control the angle between the first connecting rod 5 and the second connecting rod 6, thereby controlling the distance between the upper end of the first connecting rod 5 and the lower end of the second connecting rod 6, the angle adjustment mechanism of this invention includes a toothed groove 8 and a gear 9. The toothed groove 8 is formed on the second connecting rod 6 and distributed around the hinge shaft 7. The gear 9 is rotatably mounted on the end of the first connecting rod 5 near the second connecting rod 6 and meshes with the toothed groove 8. Thus, when the gear 9 rotates on the first connecting rod 5, it can drive the toothed groove 8 to rotate around the hinge shaft 7, thereby adjusting the angle between the first connecting rod 5 and the second connecting rod 6.

[0037] As the angle between connecting rod 5 and connecting rod 6 gradually increases, the distance between the upper end of connecting rod 5 and the lower end of connecting rod 6 increases. Since the upper end of connecting rod 5 is hinged to the screen storage box 1 and the lower end of connecting rod 6 is hinged to the counterweight rod 4, the two sides of the projection screen 3 can be effectively flattened, ensuring the flatness of the projection screen 3.

[0038] Example 2:

[0039] Based on Embodiment 1, this utility model proposes Embodiment 2. In this embodiment, to facilitate the rotation of the two gears 9, a drive shaft 14 is rotatably installed inside the curtain storage box 1. A leveling motor 17 installed on the side wall of the curtain storage box 1 drives the drive shaft 14 to rotate. Two bevel gears 15 fixedly installed on the drive shaft 14 mesh with bevel gears 16 fixed on the two hinge shafts 13, thereby simultaneously driving the two hinge shafts 13 to rotate in opposite directions. A pulley 10 is fixed on the hinge shaft 13, and a pulley 11 is fixed on the gear shaft of gear 9. When the hinge shaft 13 rotates, the pulley 10 drives the pulley 11 to rotate through the synchronous belt 12, thereby causing gear 9 to rotate.

[0040] like Figures 4 to 7 As shown, with the above settings, the leveling motor 17 can drive the drive shaft 14 to rotate, and at the same time drive the two gears 9 to rotate in opposite directions, thereby realizing the synchronous opening action of the two opening units and flattening the two sides of the projection screen 3.

[0041] After projection is finished, the rewind motor 21 rotates in reverse, driving the roller 2 to rotate in reverse, and begins the rewinding operation of the projection screen 3. The counterweight 4 moves upward as the screen is rewound.

[0042] During this process, the leveling motor 17 also adjusts the rotation direction of the drive shaft 14 accordingly. The bevel gear 15 on the drive shaft 14 drives the bevel gear 16 on the hinge shaft 13 to rotate in the opposite direction, causing the hinge shaft 13 to rotate in the opposite direction. Through the transmission mechanism composed of pulley 10, synchronous belt 12, and pulley 11, gear 9 also rotates in the opposite direction. Gear 9 drives the toothed teeth 8 to rotate around the hinge shaft 7, causing the angle between connecting rod 5 and connecting rod 6 to gradually decrease, and the distance between the upper end of connecting rod 5 and the lower end of connecting rod 6 to decrease. Figure 3 As shown, the first link 5 and the second link 6 are finally stored in the curtain storage box 1.

[0043] Example 3:

[0044] Based on Embodiments 1 and 2, the limiting plate 19 fixed at one end of connecting rod 5 near connecting rod 6 in this invention can play a limiting role. For example... Figure 6 As shown, when gear 9 rotates, causing the angle between connecting rod 6 and connecting rod 5 to reach its maximum value, the limiting plate 19 abuts against connecting rod 6 to prevent excessive stretching of the projection screen 3 due to an excessively large angle. The two ear plates 20 fixed to the top of the screen storage box 1 have through holes, allowing expansion bolts to be easily used to install the screen storage box 1 in a suitable location, such as a ceiling or wall, ensuring the stability of the device.

[0045] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A projection screen flattening device, characterized in that, include: The screen storage box has an open bottom and a rotating roller inside, on which the projection screen is wound. The counterweight bar is fixed to the bottom edge of the projection screen; Two support units are used to flatten the two sides of the projection screen. Each support unit includes a connecting rod one that is hinged to the inner wall of the screen storage box and a connecting rod two that is hinged to the counterweight rod. The connecting rod one and the connecting rod two are hinged through a hinge shaft one. Two angle adjustment mechanisms are respectively installed on the two expansion units to adjust the included angle between connecting rod one and connecting rod two; The angle adjustment mechanism includes: Toothed grooves are formed on the second connecting rod and are distributed around the first hinge shaft. Gear 1 is rotatably mounted on one end of connecting rod 1 near connecting rod 2. Gear 1 meshes with tooth threads. When gear 1 rotates on connecting rod 1, gear 1 drives tooth threads to rotate around hinge shaft 1. The curtain storage box is equipped with a drive mechanism and two transmission mechanisms. The drive mechanism drives two gears to rotate through the two transmission mechanisms respectively. The transmission mechanism includes a pulley 1, a pulley 2, and a synchronous belt. A hinge shaft 2 is rotatably installed inside the curtain storage box. A connecting rod 1 is hinged to the curtain storage box through the hinge shaft 2. The pulley 1 is fixed on the hinge shaft 2. The pulley 2 is fixed on the gear shaft of gear 1. The synchronous belt is wound around the pulley 1 and the pulley 2. The driving mechanism includes a drive shaft, which is rotatably mounted on the curtain storage box. Two bevel gears are fixed on the drive shaft, and a bevel gear that meshes with the bevel gears is fixed on the hinge shaft. The curtain storage box is fixed with a leveling motor for driving the drive shaft to rotate. The counterweight rod has end caps threaded on both ends, and a hinge shaft three is fixed on the end caps. The connecting rod two is hinged to the end caps through the hinge shaft three. A limiting plate is fixed at one end of the first connecting rod near the second connecting rod. When the angle between the second connecting rod and the first connecting rod reaches its maximum value, the limiting plate abuts against the second connecting rod.

2. The projection screen flattening device as described in claim 1, characterized in that, The top of the curtain storage box is fixed with two ear plates, and the ear plates have through holes.

3. The projection screen flattening device as described in claim 1, characterized in that, A receiver / discharge motor for driving the roller shaft to rotate is fixed on one side of the curtain storage box.

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