Multifunctional film pasting device

Abstract

The utility model discloses a multifunctional film pasting equipment, include: support frame, displacement mechanism, the displacement mechanism is located on the support frame, the displacement is along the length direction of support frame movable or along vertical direction liftable, adsorption mechanism, adsorption mechanism is located on the displacement mechanism, adsorption mechanism along vertical direction liftable, to be suitable for adsorbing protective film and putting protective film on work piece, dust removal mechanism, dust removal mechanism is located one end of adsorption mechanism, and along vertical direction can elastically rise or fall, to be suitable for dust removal to work piece, pressing mechanism, pressing mechanism is located the other end of adsorption mechanism, and along vertical direction can rise or fall, to be suitable for pressing protective film on work piece.

Description

Technical Field

[0001] This utility model relates to the field of circuit board processing technology, specifically to a multifunctional film application device. Background Technology

[0002] In circuit board manufacturing, surface mount technology (SMT) is a crucial step in protecting circuit board traces, solder mask layers, or labeling layers. Traditional SMT equipment often relies on manual or semi-automated operations, presenting the following technical challenges:

[0003] (1) Manual film application is inefficient and inconsistent, and the film layer is easily shifted due to positioning deviation, which affects the accuracy of subsequent processing.

[0004] (2) Tiny particles or dust are easily attached to the surface of the circuit board. The existing equipment has weak dust removal function. After the film is applied, bubbles or local peeling are easily formed, which reduces the product yield.

[0005] (3) The film application and lamination are carried out in separate steps, which is complicated and requires a large area of ​​equipment. Utility Model Content

[0006] This utility model aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this utility model is to provide a multifunctional film application device, comprising:

[0007] Support frame;

[0008] A displacement mechanism is provided on the support frame, and the displacement mechanism is movable along the length direction of the support frame or can be raised and lowered along the vertical direction;

[0009] An adsorption mechanism is provided on the displacement mechanism. The adsorption mechanism can be raised and lowered in the vertical direction to adsorb the protective film and place the protective film on the workpiece.

[0010] A dust removal mechanism is located at one end of the adsorption mechanism and can be elastically raised or lowered in the vertical direction to remove dust from the workpiece.

[0011] A pressing mechanism is located at the other end of the adsorption mechanism and can rise or fall vertically to press the protective film onto the workpiece.

[0012] Preferably, the displacement mechanism includes:

[0013] The first lead screw module is located on the top of the support frame and is arranged along the length of the support frame;

[0014] A sliding frame, which is slidably mounted on the first lead screw module;

[0015] A first fixing plate is vertically mounted on the sliding frame;

[0016] The second lead screw module is disposed on the fixed plate and is arranged in the vertical direction;

[0017] A slider is slidably mounted on the second lead screw module.

[0018] Preferably, the slider has a first mounting groove in the middle, and the first mounting groove extends vertically through the top and bottom of the slider.

[0019] Preferably, a second fixing plate is provided on the side of the first fixing plate, and the second fixing plate is provided with the bottom of the second lead screw module.

[0020] Preferably, the second fixing plate is provided with a second mounting groove, which extends vertically through the top and bottom of the second fixing plate and is located in the same vertical direction as the first mounting groove.

[0021] Preferably, the adsorption mechanism includes:

[0022] The first air rod is vertically installed in the first mounting groove and the second mounting groove;

[0023] The first slide rail is vertically mounted on the first fixed plate;

[0024] The first connector is located at the bottom of the first air rod and is connected to the transmission end of the first air rod.

[0025] A sliding member, one end of which is slidably connected to the first slide rail, and the other end of which is connected to the first connecting member;

[0026] The second connector is located at the bottom of the first connector and is rotatably engaged with the first connector;

[0027] The third fixing plate is disposed at the bottom of the second connector;

[0028] An adsorption plate is disposed at the bottom of the third fixing plate.

[0029] Preferably, the dust removal mechanism includes:

[0030] A first fixing frame is disposed on one side of the second fixing plate;

[0031] The second air rod is vertically installed at the bottom of the first fixing frame;

[0032] The second slide rail is vertically disposed on the side of the third fixing plate;

[0033] A sliding plate, wherein the sliding plate is slidably mounted on the second slide rail, and the transmission end of the second gas spring is connected to the sliding plate;

[0034] A first fixing post is vertically disposed at one end of the bottom of the sliding plate;

[0035] The first limiting block is located at the bottom of the first fixed column;

[0036] The second fixing post is vertically disposed at the other end of the bottom of the sliding plate;

[0037] The second limiting block is located at the bottom of the second fixed column;

[0038] A movable frame is slidably mounted on the first fixed column and the second fixed column;

[0039] A viscous roller is disposed inside the movable frame, and both ends of the viscous roller are rotatably connected to both sides inside the movable frame, respectively.

[0040] Two first springs are respectively sleeved on the upper ends of the first fixed post and the second fixed post, with one end of each first spring abutting against the sliding plate and the other end abutting against the movable frame;

[0041] Two second springs are respectively sleeved on the lower ends of the first fixed post and the second fixed post. One end of each second spring abuts against the movable frame, and the other end abuts against the first limiting block and the second limiting block respectively.

[0042] Preferably, the pressing mechanism includes:

[0043] The second fixing frame is disposed on the other side of the second fixing plate;

[0044] The third gas spring is vertically installed at the bottom of the second fixing frame;

[0045] The third slide rail is vertically disposed on the side of the third fixed plate;

[0046] A sliding frame, wherein the sliding frame is slidably mounted on the third slide rail, and the transmission end of the third pneumatic rod is connected to the sliding frame;

[0047] A pressing roller is provided on the sliding frame, and the two ends of the pressing roller are rotatably connected to the two sides inside the sliding frame, respectively.

[0048] The above-described solution of this utility model has at least the following beneficial effects:

[0049] This multi-functional film application equipment can be set up next to the conveyor belt. When the conveyor belt transports the workpiece (circuit board) to the bottom of the adsorption mechanism, the displacement mechanism moves the dust removal mechanism to the top of the workpiece. Then the displacement mechanism moves the dust removal mechanism down vertically. When the displacement mechanism reaches the preset height, the dust removal mechanism descends again and comes into contact with the workpiece. Then the displacement mechanism moves the dust removal mechanism back and forth along the length direction so that the dust removal mechanism rolls on the workpiece, thereby removing dust and other impurities from the workpiece.

[0050] After the dust removal of the workpiece is completed, the dust removal mechanism rises and resets vertically, while the adsorption mechanism can adsorb the protective film from the conveyor belt or external equipment. The displacement mechanism moves the adsorption mechanism above the workpiece, and then the displacement mechanism lowers the adsorption mechanism to a preset height. Then the adsorption mechanism itself continues to descend and attaches the protective film to the workpiece.

[0051] After the film is applied, the adsorption mechanism rises and resets vertically, while the displacement mechanism moves the pressing mechanism above the workpiece. Then, the adsorption mechanism descends vertically and rests against the workpiece. The displacement mechanism then moves the pressing mechanism back and forth on the workpiece so that the pressing mechanism can apply pressure to the protective film, making the protective film completely adhere to the workpiece.

[0052] The adsorption mechanism is driven by a displacement mechanism to move and lift along the length of the support frame or in the vertical direction. Combined with independently controlled dust removal and pressing mechanisms, the dust removal, film application, and pressing processes are continuously automated. The dust removal mechanism adopts a vertical elastic lifting structure (such as a spring or pneumatic buffer) to ensure the dust removal effect while avoiding rigid collision damage to precision circuits.

[0053] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0054] 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 the structures shown in these drawings without creative effort.

[0055] Figure 1 This is a schematic diagram of the structure of the multifunctional film application device provided in this embodiment of the utility model;

[0056] Figure 2 This is a schematic diagram of the support frame provided in an embodiment of the present utility model;

[0057] Figure 3 yes Figure 1 Enlarged view of part A;

[0058] Figure 4 yes Figure 1 A schematic diagram of the BB cross-sectional structure;

[0059] Figure 5 yes Figure 4 Enlarged view of part C;

[0060] Figure 6 yes Figure 2 Enlarged view of part D.

[0061] Explanation of icon numbers:

[0062] 1. Support frame; 2. Displacement mechanism; 3. Adsorption mechanism; 4. Dust removal mechanism; 5. Pressing mechanism;

[0063] 201. First lead screw module; 202. Sliding frame; 203. First fixing plate; 204. Second lead screw module; 205. Slider; 206. Second fixing plate;

[0064] 301. First air spring; 302. First slide rail; 303. First connector; 304. Sliding component; 305. Second connector; 306. Third fixing plate; 307. Adsorption plate.

[0065] 401. First fixed frame; 402. Second gas spring; 403. Second slide rail; 404. Slide plate; 405. First fixed post; 406. First limiting block; 407. Second fixed post; 408. Second limiting block; 409. Movable frame; 410. Adhesive roller; 411. First spring; 412. Second spring.

[0066] 501. Second fixed frame; 502. Third air spring; 503. Third slide rail; 504. Sliding frame; 505. Pressing roller.

[0067] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0068] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0069] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0071] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0072] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0073] The multifunctional film-applying device of this utility model is described in detail below with reference to the accompanying drawings.

[0074] Please see Figures 1-6In this embodiment, the device includes: a support frame 1; a displacement mechanism 2, which is mounted on the support frame 1 and can move along the length of the support frame 1 or rise and fall vertically; an adsorption mechanism 3, which is mounted on the displacement mechanism 2 and can rise and fall vertically to adsorb the protective film and place it on the workpiece; a dust removal mechanism 4, which is located at one end of the adsorption mechanism 3 and can rise and fall elastically vertically to remove dust from the workpiece; and a pressing mechanism 5, which is located at the other end of the adsorption mechanism 3 and can rise and fall vertically to press the protective film onto the workpiece.

[0075] This multi-functional film application equipment can be set up next to the conveyor belt. When the conveyor belt transports the workpiece (circuit board) to the bottom of the adsorption mechanism 3, the displacement mechanism 2 moves the dust removal mechanism 4 above the workpiece. Then, the displacement mechanism 2 moves the dust removal mechanism 4 down vertically. When the displacement mechanism 2 reaches the preset height, the dust removal mechanism 4 descends again and comes into contact with the workpiece. Then, the displacement mechanism 2 moves the dust removal mechanism 4 back and forth along the length direction so that the dust removal mechanism 4 rolls on the workpiece, thereby removing dust and other impurities from the workpiece.

[0076] After the dust removal of the workpiece is completed, the dust removal mechanism 4 rises and resets in the vertical direction, while the adsorption mechanism 3 can adsorb the protective film from the conveyor belt or external equipment. The displacement mechanism 2 moves the adsorption mechanism 3 above the workpiece, and then the displacement mechanism 2 lowers the adsorption mechanism 3 to the preset height. Then the adsorption mechanism 3 continues to descend and attaches the protective film to the workpiece.

[0077] After the film is applied, the adsorption mechanism 3 rises and resets vertically, while the displacement mechanism 2 moves the pressing mechanism 5 above the workpiece. Then, the adsorption mechanism 3 descends vertically and rests against the workpiece. The displacement mechanism 2 then moves the pressing mechanism 5 back and forth on the workpiece so that the pressing mechanism 5 can apply pressure to the protective film, making the protective film completely adhere to the workpiece.

[0078] The displacement mechanism 2 drives the adsorption mechanism 3 to move and lift along the length or vertical direction of the support frame 1. Combined with the independently controlled dust removal mechanism 4 and pressing mechanism 5, the dust removal, film application and pressing processes are continuously automated. The dust removal mechanism 4 adopts a vertical elastic lifting structure (such as spring or pneumatic buffer) to ensure the dust removal effect and avoid rigid collision damage to precision circuits.

[0079] In this embodiment, the displacement mechanism 2 includes: a first lead screw module 201, which is disposed on the top of the support frame 1 and arranged along the length direction of the support frame 1; a sliding frame 202, which is slidably disposed on the first lead screw module 201; a first fixed plate 203, which is vertically disposed on the sliding frame 202; a second lead screw module 204, which is disposed on the fixed plate and arranged in the vertical direction; and a slider 205, which is slidably disposed on the second lead screw module 204. The first lead screw module 201 moves along the length direction of the support frame 1 with the second lead screw module 204 on the sliding frame 202. The adsorption mechanism 3 is disposed on the slider 205. When the adsorption mechanism 3, the dust removal mechanism 4, or the pressing mechanism 5 needs to rise or fall in the vertical direction, the second lead screw module 204 can move up or down with the slider 205, and the adsorption mechanism 3 on the slider 205 will follow suit.

[0080] In this embodiment, a first mounting groove is provided in the middle of the slider 205, and the first mounting groove extends vertically through the top and bottom of the slider 205; a second fixing plate 206 is provided on the side of the first fixing plate 203, and the bottom of the second lead screw module 204 is provided on the second fixing plate 206; a second mounting groove is provided on the second fixing plate 206, and the second mounting groove extends vertically through the top and bottom of the second fixing plate 206, and is located in the same vertical direction as the first mounting groove.

[0081] In this embodiment, the adsorption mechanism 3 includes: a first air rod 301, which is vertically disposed in a first mounting groove and a second mounting groove; a first slide rail 302, which is vertically disposed on a first fixed plate 203; a first connecting member 303, which is disposed at the bottom of the first air rod 301 and connected to the transmission end of the first air rod 301; a sliding member 304, one end of which is slidably connected to the first slide rail 302 and the other end of which is connected to the first connecting member 303; a second connecting member 305, which is disposed at the bottom of the first connecting member 303 and rotatably engaged with the first connecting member 303; a third fixed plate 306, which is disposed at the bottom of the second connecting member 305; and an adsorption plate 307, which is disposed at the bottom of the third fixed plate 306.

[0082] When it is necessary to adsorb the protective film or attach the protective film to the workpiece, the first air rod 301 can carry the adsorption plate 307 to rise or fall vertically. While the adsorption plate 307 is rising and falling, the sliding member 304 also moves up and down on the first slide rail 302 at the same time, thereby playing an auxiliary stabilizing role for the adsorption plate 307, so that the adsorption plate 307 will not deviate when adsorbing the protective film.

[0083] In this embodiment, the dust removal mechanism 4 includes: a first fixed frame 401, which is disposed on one side of the second fixed plate 206; a second air rod 402, which is vertically disposed at the bottom of the first fixed frame 401; a second slide rail 403, which is vertically disposed on the side of the third fixed plate 306; a slide plate 404, which is slidably disposed on the second slide rail 403, and the transmission end of the second air rod 402 is connected to the slide plate 404; a first fixed post 405, which is vertically disposed at one end of the bottom of the slide plate 404; a first limiting block 406, which is disposed at the bottom of the first fixed post 405; a second fixed post 407, which is vertically disposed at the other end of the bottom of the slide plate 404; and a second limiting block 408, which is disposed on the second fixed post. The bottom of 407 includes: a movable frame 409, which is slidably mounted on the first fixed post 405 and the second fixed post 407; an adhesive roller 410, which is located inside the movable frame 409, with both ends of the roller 410 rotatably connected to the two sides inside the movable frame 409; two first springs 411, which are respectively sleeved on the upper ends of the first fixed post 405 and the second fixed post 407, with one end of each spring abutting against the sliding plate 404 and the other end abutting against the movable frame 409; and two second springs 412, which are respectively sleeved on the lower ends of the first fixed post 405 and the second fixed post 407, with one end of each spring abutting against the movable frame 409 and the other end abutting against the first limiting block 406 and the second limiting block 408, respectively.

[0084] When dust removal is required on the workpiece, the displacement mechanism 2 moves the adhesive roller 410 above the workpiece. After the displacement mechanism 2 descends to a preset height, the second air rod 402 pushes the sliding plate 404 down so that the adhesive roller 410 abuts against the workpiece. When the adhesive roller 410 abuts against the workpiece, the first spring 411 or the second spring 412 is compressed, which plays a role in shock absorption or buffering, thereby protecting the workpiece from damage caused by hard contact. After the adhesive roller 410 abuts against the workpiece, the displacement mechanism 2 moves the adhesive roller 410 along the length of the support frame 1 so that the adhesive roller 410 rolls on the workpiece, thereby removing dust and other impurities from the workpiece. After the dust removal of the workpiece is completed, the second air rod 402 moves the sliding plate 404 up in the vertical direction so that the adhesive roller 410 is moved away from the workpiece and resets.

[0085] In this embodiment, the pressing mechanism 5 includes: a second fixed frame 501, which is disposed on the other side of the second fixed plate 206; a third air rod 502, which is vertically disposed at the bottom of the second fixed frame 501; a third slide rail 503, which is vertically disposed on the side of the third fixed plate 306; a sliding frame 504, which is slidably disposed on the third slide rail 503, and the transmission end of the third air rod 502 is connected to the sliding frame 202; and a pressing roller 505, which is disposed on the sliding frame 504, and the two ends of the pressing roller 505 are rotatably connected to the two sides inside the sliding frame 504 respectively.

[0086] After the adsorption mechanism 3 adheres the protective film to the workpiece, the displacement mechanism 2 moves the pressing roller 505 above the workpiece. Then, the third air rod 502 pushes the pressing roller 505 against the protective film. Subsequently, the displacement mechanism 2 moves the pressing roller 505 back and forth along the length of the support frame 1, so that the pressing roller 505 rolls back and forth on the protective film, thereby making the protective film completely adhere to the workpiece. After the protective film is pressed, the third air rod 502 moves the pressing roller 505 up and down in the vertical direction to reset it.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multi-functional film application device, characterized in that, include: Support frame; A displacement mechanism is provided on the support frame, and the displacement mechanism is movable along the length direction of the support frame or can be raised and lowered along the vertical direction; An adsorption mechanism is provided on the displacement mechanism. The adsorption mechanism can be raised and lowered in the vertical direction to adsorb the protective film and place the protective film on the workpiece. A dust removal mechanism is located at one end of the adsorption mechanism and can be elastically raised or lowered in the vertical direction to remove dust from the workpiece. A pressing mechanism is located at the other end of the adsorption mechanism and can rise or fall vertically to press the protective film onto the workpiece.

2. The multifunctional film applicator according to claim 1, characterized in that, The displacement mechanism includes: The first lead screw module is located on the top of the support frame and is arranged along the length of the support frame; A sliding frame, which is slidably mounted on the first lead screw module; A first fixing plate is vertically mounted on the sliding frame; The second lead screw module is disposed on the fixed plate and is arranged in the vertical direction; A slider is slidably mounted on the second lead screw module.

3. The multifunctional film applicator according to claim 2, characterized in that, The slider has a first mounting groove in the middle, which extends vertically through the top and bottom of the slider.

4. The multifunctional film applicator according to claim 3, characterized in that, The first fixing plate has a second fixing plate on its side, and the second fixing plate has the bottom of the second lead screw module.

5. The multifunctional film applicator according to claim 4, characterized in that, The second mounting plate is provided with a second mounting groove, which extends vertically through the top and bottom of the second mounting plate and is located in the same vertical direction as the first mounting groove.

6. The multifunctional film applicator according to claim 5, characterized in that, The adsorption mechanism includes: The first air rod is vertically installed in the first mounting groove and the second mounting groove; The first slide rail is vertically mounted on the first fixed plate; The first connector is located at the bottom of the first air rod and is connected to the transmission end of the first air rod. A sliding member, one end of which is slidably connected to the first slide rail, and the other end of which is connected to the first connecting member; The second connector is located at the bottom of the first connector and is rotatably engaged with the first connector; The third fixing plate is disposed at the bottom of the second connector; An adsorption plate is disposed at the bottom of the third fixing plate.

7. The multifunctional film applicator according to claim 6, characterized in that, The dust removal mechanism includes: A first fixing frame is disposed on one side of the second fixing plate; The second air rod is vertically installed at the bottom of the first fixing frame; The second slide rail is vertically disposed on the side of the third fixing plate; A sliding plate, wherein the sliding plate is slidably mounted on the second slide rail, and the transmission end of the second gas spring is connected to the sliding plate; A first fixing post is vertically disposed at one end of the bottom of the sliding plate; The first limiting block is located at the bottom of the first fixed column; The second fixing post is vertically disposed at the other end of the bottom of the sliding plate; The second limiting block is located at the bottom of the second fixed column; A movable frame is slidably mounted on the first fixed column and the second fixed column; A viscous roller is disposed inside the movable frame, and both ends of the viscous roller are rotatably connected to both sides inside the movable frame, respectively. Two first springs are respectively sleeved on the upper ends of the first fixed post and the second fixed post, with one end of each first spring abutting against the sliding plate and the other end abutting against the movable frame; Two second springs are respectively sleeved on the lower ends of the first fixed post and the second fixed post. One end of each second spring abuts against the movable frame, and the other end abuts against the first limiting block and the second limiting block respectively.

8. The multifunctional film applicator according to claim 6, characterized in that, The pressing mechanism includes: The second fixing frame is disposed on the other side of the second fixing plate; The third gas spring is vertically installed at the bottom of the second fixing frame; The third slide rail is vertically disposed on the side of the third fixed plate; A sliding frame, wherein the sliding frame is slidably mounted on the third slide rail, and the transmission end of the third pneumatic rod is connected to the sliding frame; A pressing roller is provided on the sliding frame, and the two ends of the pressing roller are rotatably connected to the two sides inside the sliding frame, respectively.

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