An oil painting coating machine inlet convenient to adjust

Abstract

The utility model belongs to the field of oil painting coating machine cloth feeding, especially involve a kind of oil painting coating machine cloth feeding port of convenient adjustment. The utility model provides a kind of oil painting coating machine cloth feeding port of convenient adjustment, include: two limit frame, the outer side one end of two the limit frame is fixedly connected with the limit plate of L type;Guide roller, rotationally arranged between two the limit plate, and two the limit frame symmetrical sleeve is arranged in the outer side of the both ends of guide roller;Adjusting mechanism, between the rear end of two the limit frame, by adjusting mechanism drive two limit frame along guide roller axial synchronous reverse movement, can be quickly adapted to the oil painting cloth of different width, need not to disassemble adjustment, solve the problem that traditional fixed cloth feeding port replacement size needs to stop, extrusion mechanism and self-adapting component cooperation realize the elastic extrusion to different thickness canvas, avoid too tight stretch or too loose instability, improve production continuity and coating consistency.

Description

Technical Field

[0001] This utility model belongs to the field of fabric inlet for oil painting coating machines, and particularly relates to an easily adjustable fabric inlet for oil painting coating machines. Background Technology

[0002] In the field of canvas production and processing, the canvas coating machine is a key piece of equipment, mainly used to uniformly coat the surface of the canvas with functional materials such as primer and waterproof coating to improve the canvas's ink absorption, durability, and image expressiveness. The canvas inlet, as an important component of the coating machine, plays a crucial role in guiding the canvas smoothly into the coating mechanism; its dimensional adaptability directly affects the stability of the canvas transport, the uniformity of the coating, and the operating efficiency of the equipment.

[0003] Currently, most traditional oil painting coating machines use a fixed fabric inlet design. The width, height, and other parameters are preset to specific specifications when the equipment leaves the factory, which can only accommodate a single or small range of canvas sizes. The existing fixed fabric inlets have the following significant problems:

[0004] 1. When it is necessary to change to a different size canvas, the machine must be stopped to disassemble and adjust the canvas inlet or replace the matching parts. The operation is cumbersome and time-consuming, which seriously affects the continuity of production, especially in small-batch, multi-specification production scenarios, resulting in low production efficiency.

[0005] 2. Insufficient adjustment precision can easily lead to asymmetry in the limit positions on both sides during the adjustment process, causing the canvas to shift and wrinkle during transport, resulting in uneven coating thickness, missing coating at the edges, and other quality defects, increasing the scrap rate.

[0006] 3. Lack of adaptability to canvases of different thicknesses; too tight a material can cause the canvas to stretch and deform, while too loose a material can lead to unstable transport and affect the consistency of the coating effect. Utility Model Content

[0007] The purpose of this invention is to address the aforementioned technical problems by providing an easily adjustable fabric inlet for an oil painting coating machine. The adjustment mechanism drives two limiting frames to move synchronously in opposite directions along the axial direction of the guide roller, which can quickly adapt to oil painting canvases of different widths without disassembly and adjustment. This solves the problem of having to stop the machine to change the size of a traditional fixed fabric inlet. The extrusion mechanism and the adaptive component work together to achieve elastic extrusion of canvases of different thicknesses, avoiding excessive stretching or instability due to excessive looseness, thereby improving production continuity and coating consistency.

[0008] In view of this, the present invention provides an easily adjustable fabric inlet for an oil painting coating machine, comprising:

[0009] Two limiting frames, each with an L-shaped limiting plate fixedly connected to one outer end;

[0010] The guide roller is rotatably positioned between the two limiting plates, and the two limiting frames are symmetrically sleeved on the outer sides of both ends of the guide roller.

[0011] An adjustment mechanism is provided between the rear ends of the two limiting frames, and is used to drive the two limiting frames to move synchronously in opposite directions along the axial direction of the guide roller to adjust the spacing.

[0012] An extrusion mechanism is positioned above the guide roller. An adaptive component is installed between the extrusion mechanism and the limiting plate. Through the cooperation of the extrusion mechanism and the adaptive component, adaptive elastic extrusion of canvases of different thicknesses is achieved to ensure the stability of the canvas during the conveying process.

[0013] In this technical solution, the two limit frames are driven to move synchronously in opposite directions along the axial direction of the guide roller by the adjustment mechanism, which can quickly adapt to canvases of different widths without disassembly and adjustment. This solves the problem of having to stop the machine to change the size of the traditional fixed cloth inlet. The extrusion mechanism and the adaptive component work together to achieve elastic extrusion of canvases of different thicknesses, avoiding excessive stretching or instability due to excessive looseness, thereby improving production continuity and coating consistency.

[0014] Furthermore, the adjustment mechanism includes:

[0015] A connecting plate is provided at the rear end of the two limiting frames. An adjustment groove is provided on the connecting plate, and an adjustment block is slidably connected to both sides of the inner cavity of the adjustment groove.

[0016] A bidirectional lead screw, the two ends of which are rotatably connected to the two ends of the inner cavity of the adjusting groove through sealed bearings, and two adjusting blocks are respectively threaded onto the outer sides of the bidirectional lead screw.

[0017] In this technical solution, the two adjusting blocks are driven to slide synchronously in opposite directions by a bidirectional lead screw in the adjusting mechanism, which can accurately control the distance between the two limiting frames, ensure symmetrical limiting on both sides, solve the problems of canvas offset and wrinkles caused by insufficient adjustment accuracy in traditional methods, and reduce the coating defect rate.

[0018] Furthermore, the adaptive component includes:

[0019] Two sliding grooves are respectively opened at one end of the two limiting plates, and a slider is slidably connected in each of the two sliding grooves;

[0020] Two springs, one end of each spring is fixedly connected to the top of the inner cavity of each of the two slides, and the other end of each spring is fixedly connected to each of the two sliders.

[0021] In this technical solution, the cooperation between the slider and the spring in the chute allows the extrusion mechanism to automatically and elastically adjust the pressure according to the thickness of the canvas, adapting to canvases of different thicknesses, avoiding tensile deformation or unstable conveying caused by fixed pressure, and ensuring consistent coating effect.

[0022] Furthermore, the extrusion mechanism includes a pressure roller, which is disposed between the two limiting frames above the guide roller. Both ends of the pressure roller are fixedly connected to a rotating shaft, and the two rotating shafts are rotatably connected to the two sliders respectively through sealed bearings.

[0023] In this technical solution, the pressure roller is rotatably connected to the slider via a rotating shaft. It can adjust its height according to the slider to adapt to canvases of different thicknesses, and rotate synchronously with the canvas to reduce friction, thereby ensuring conveying stability and improving coating uniformity.

[0024] Furthermore, each of the four corners of the connecting plate near the limiting frame is rotatably fitted with a fixing bolt.

[0025] In this technical solution, the fixing bolts facilitate the installation of the device at the feed inlet of the oil painting coating machine.

[0026] Furthermore, the outer shaft of the bidirectional lead screw is fitted with a telescopic bellows, and the bidirectional lead screw does not contact the inner wall of the telescopic bellows.

[0027] In this technical solution, a telescopic corrugated tube is used to protect the bidirectional lead screw, preventing dust and impurities from adhering during the processing and causing the lead screw to jam, ensuring the smooth operation of the adjustment mechanism, and maintaining the accuracy and reliability of the spacing adjustment.

[0028] Furthermore, a dust collection cover is provided at the top of the pressure roller and the bottom of the guide roller. A fixing rod is fixedly connected between the bottom two sides of the dust collection cover at the top of the pressure roller and the slider. The two ends of the dust collection cover at the bottom of the guide roller are fixedly connected to the two limiting plates respectively. A vacuum cleaner is fixedly installed at one end of the outer side of the limiting frame. A vacuum cleaner hose is connected between the suction end of the vacuum cleaner and the dust collection cover.

[0029] In this technical solution, the dust collection covers at the top of the pressure roller and the bottom of the guide roller, together with a vacuum cleaner, can promptly remove dust, fibers and other impurities adsorbed on the surface of the pressure roller and guide roller, preventing impurities from adhering to the canvas surface and causing defects such as particles and spots in the coating. The flexible connection of the vacuum hose does not affect the adaptive adjustment of the extrusion mechanism, further ensuring the coating quality.

[0030] Furthermore, the dust collection hood is provided with an inclined surface at one end near the pressure roller and the guide roller, and the higher end of each inclined surface moves against the pressure roller and the guide roller.

[0031] In this technical solution, the high end of the inclined surface of the dust collection hood moves against the pressure roller and guide roller, thereby closely adhering to the roller surface and scraping off the dust, fibers and other impurities adsorbed on the pressure roller and guide roller, thus improving the dust collection effect.

[0032] The beneficial effects of this utility model are:

[0033] 1. This utility model drives two limit frames to move synchronously in opposite directions along the axial direction of the guide roller through an adjustment mechanism, which can quickly adapt to canvases of different widths without disassembly and adjustment. This solves the problem of having to stop the machine when changing the size of the traditional fixed cloth inlet. The extrusion mechanism and the adaptive component work together to achieve elastic extrusion of canvases of different thicknesses, avoiding excessive stretching or instability due to excessive looseness, thereby improving production continuity and coating consistency.

[0034] 2. This utility model uses dust collection covers on the top of the pressure roller and the bottom of the guide roller in conjunction with a vacuum cleaner to promptly remove dust, fibers and other impurities adsorbed on the surface of the pressure roller and guide roller, preventing impurities from adhering to the canvas surface and causing defects such as particles and spots in the coating. The flexible connection of the vacuum hose does not affect the adaptive adjustment of the extrusion mechanism, further ensuring the coating quality. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0036] Figure 2 This is a schematic diagram of the connection structure between the connecting plate and the limiting frame of this utility model;

[0037] Figure 3 This is a schematic diagram of the connection structure between the guide roller and the dust collection hood of this utility model;

[0038] Figure 4 This is a sectional front view of the connection between the bidirectional lead screw and the telescopic bellows of this utility model.

[0039] In the diagram: 1. Pressure roller; 11. Limiting frame; 2. Connecting shaft; 21. Guide roller; 3. Slide groove; 31. Rotating shaft; 32. Sliding block; 33. Spring; 4. Connecting plate; 41. Adjusting groove; 42. Adjusting block; 43. Bidirectional lead screw; 44. Fixing bolt; 45. Telescopic corrugated pipe; 5. Vacuum cleaner; 51. Vacuum hose; 52. Fixing rod; 53. Dust collection hood; 54. Sloping part; 6. Limiting plate. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0042] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0043] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0044] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0045] Example 1:

[0046] like Figure 1-4 As shown, this utility model provides an easily adjustable fabric inlet for an oil painting coating machine, comprising:

[0047] Two limiting frames 11, each with an L-shaped limiting plate 6 fixedly connected to one outer end of the two limiting frames 11;

[0048] The guide roller 21 is rotatably disposed between the two limiting plates 6, and the two limiting frames 11 are symmetrically sleeved on the outer sides of both ends of the guide roller 21. Both ends of the guide roller 21 are fixedly connected to the connecting shaft 2, and the two connecting shafts 2 are rotatably connected to the two limiting plates 6 respectively through sealed bearings.

[0049] An adjustment mechanism is provided between the rear ends of the two limiting frames 11, and is used to drive the two limiting frames 11 to move synchronously in opposite directions along the axial direction of the guide roller 21 to adjust the spacing.

[0050] An extrusion mechanism is positioned above the guide roller 21. An adaptive component is installed between the extrusion mechanism and the limiting plate 6. Through the cooperation of the extrusion mechanism and the adaptive component, adaptive elastic extrusion of canvases of different thicknesses is achieved to ensure the stability of the canvas during the conveying process.

[0051] During operation, the two limit frames 11 are driven by the adjustment mechanism to move synchronously in opposite directions along the axial direction of the guide roller 21. By precisely adjusting the distance between the two, different widths of canvas can be quickly adapted without stopping the machine to disassemble or replace parts. This solves the problem of cumbersome operation and disruption of production continuity when changing the size of the traditional fixed cloth inlet. At the same time, under the action of the adaptive component, the extrusion mechanism will automatically adjust the pressure between itself and the guide roller 21 according to the thickness of the canvas. When the canvas is thicker, the extrusion mechanism is pressed upward, causing the adaptive component to store energy and form elastic pressure that is suitable for thick canvas. When the canvas is thinner, the adaptive component releases energy and pushes the extrusion mechanism downward to maintain appropriate pressure, avoiding stretching deformation caused by excessive tightness or unstable conveying caused by excessive looseness, thus ensuring the consistency of the coating effect.

[0052] The adjustment mechanism includes: a connecting plate 4, located at the rear end of the two limiting frames 11, with an adjustment groove 41 on the connecting plate 4, and adjustment blocks 42 slidably connected to both sides of the inner cavity of the adjustment groove 41; a bidirectional lead screw 43, with both ends of the bidirectional lead screw 43 rotatably connected to both ends of the inner cavity of the adjustment groove 41 through sealed bearings, and the two adjustment blocks 42 respectively threaded onto the outer sides of the bidirectional lead screw 43.

[0053] During adjustment, the rotation of the bidirectional lead screw 43 drives the two adjusting blocks 42 to slide synchronously in opposite directions along the adjusting groove 41, thereby driving the two limiting frames 11 to adjust the spacing symmetrically along the axis of the guide roller 21. Since the threads on both sides of the bidirectional lead screw 43 have opposite directions and the same pitch, it can ensure that the movement distance of the two limiting frames 11 is exactly the same, avoiding the problem of asymmetry of the limiting on both sides in the traditional adjustment method. This fundamentally reduces the offset and wrinkles during canvas transportation, and reduces the occurrence of quality defects such as uneven coating thickness and edge missed coating.

[0054] The adaptive component includes: two slide grooves 3, which are respectively opened at opposite ends of the two limiting plates 6, and sliders 32 are slidably connected in both slide grooves 3; and two springs 33, one end of which is fixedly connected to the top of the inner cavity of the two slide grooves 3, and the other end of which is fixedly connected to the two sliders 32.

[0055] When canvases of different thicknesses pass between the guide roller 21 and the extrusion mechanism, the extrusion mechanism is pressed and drives the slider 32 to slide upward along the groove 3. The spring 33 is compressed and generates a reverse elastic force. The thicker the canvas, the greater the upward distance of the slider 32 and the stronger the elastic force of the spring 33, forming an extrusion pressure that matches the thickness of the canvas. This allows for real-time matching of the clamping requirements of canvases of different thicknesses, solving the problems of excessive tension or instability under traditional fixed pressure, and ensuring the stability of the canvas during the conveying process.

[0056] The extrusion mechanism includes a pressure roller 1, which is located between two limiting frames 11 above the guide roller 21. Both ends of the pressure roller 1 are fixedly connected to a rotating shaft 31, and the two rotating shafts 31 are rotatably connected to the two sliders 32 respectively through sealed bearings.

[0057] The pressure roller 1 is rotatably connected to the slider 32 via the rotating shaft 31. When the canvas is conveyed, the pressure roller 1 rotates synchronously with the canvas, changing the traditional sliding friction into rolling friction, which greatly reduces the wear on the canvas surface. At the same time, the pressure roller 1 can move up and down along the slide groove 3 with the slider 32. Under the action of the spring 33, it always maintains a moderate fit with the canvas, which not only meets the needs of canvases of different thicknesses, but also ensures that the canvas is flat and wrinkle-free through rolling conveying, further improving the uniformity of the coating.

[0058] The four corners of the connecting plate 4 near the limiting frame 11 are all rotatably connected by fixing bolts 44.

[0059] The device can be easily installed at the feed inlet of the oil painting coating machine using the fixing bolt 44.

[0060] The outer shaft of the bidirectional lead screw 43 is fitted with a telescopic bellows 45, and the bidirectional lead screw 43 does not contact the inner wall of the telescopic bellows 45.

[0061] When the bidirectional lead screw 43 rotates for adjustment, the telescopic bellows 45 extends and retracts synchronously with the movement of the adjusting block 42, isolating the bidirectional lead screw 43 from the external environment and preventing impurities such as fibers and dust that fall off during canvas transport from adhering to the screw threads. This avoids screw jamming or reduced transmission accuracy caused by impurities, ensuring that the bidirectional lead screw 43 always smoothly drives the adjusting block 42, maintaining the accuracy of spacing adjustment and ensuring stable adaptation to canvases of different widths.

[0062] Example 2:

[0063] like Figure 1 and Figure 3 As shown, the top of the pressure roller 1 and the bottom of the guide roller 21 are both provided with dust collection covers 53. The bottom ends of the dust collection cover at the top of the pressure roller 1 are fixedly connected to the slider 32 with fixing rods 52. The two ends of the dust collection cover 53 at the bottom of the guide roller 21 are respectively fixedly connected to the two limiting plates 6. A vacuum cleaner 5 is fixedly installed at one end of the outer side of the limiting frame 11. A vacuum cleaner hose 51 is connected between the suction end of the vacuum cleaner 5 and the dust collection cover 53.

[0064] During operation, the vacuum cleaner 5 generates negative pressure, drawing airflow from the top of the pressure roller 1 and the bottom of the guide roller 21 through the suction hose 51. As the canvas is conveyed between the pressure roller 1 and the guide roller 21, dust, fibers, and other impurities falling off the canvas surface are lifted up by the rotation of the rollers. The dust collection hood 53 at the top of the pressure roller 1 captures the floating impurities generated when the pressure roller 1 comes into contact with the canvas, while the dust collection hood 53 at the bottom of the guide roller 21 collects the impurities that settle below the guide roller 21. Both types of impurities are removed by the vacuum cleaner 5 through the suction hose 51. At the same time, the flexible characteristics of the suction hose 51 allow it to deform freely with the up and down movement of the pressure roller 1 without interfering with the adaptive adjustment of the extrusion mechanism. This ensures that the canvas conveying stability is not affected while removing impurities, avoiding defects such as coating particles and spots caused by impurity adhesion, and further guaranteeing the coating quality.

[0065] The dust collection hood 53 is provided with an inclined surface 54 at one end near the pressure roller 1 and the guide roller 21, and the higher end of each inclined surface 54 is in contact with the pressure roller 1 and the guide roller 21.

[0066] By having the high end of the inclined surface 54 of the dust collection hood 53 move against the pressure roller 1 and the guide roller 21, it can closely adhere to the surface of the roller body to scrape off the dust, fibers and other impurities adsorbed on the pressure roller 1 and the guide roller 21, thereby improving the dust collection effect.

[0067] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An adjustable fabric inlet for an oil painting coating machine, characterized in that, include: Two limiting frames (11), and an L-shaped limiting plate (6) is fixedly connected to one side of each of the two limiting frames (11). The guide roller (21) is rotatably disposed between the two limiting plates (6), and the two limiting frames (11) are symmetrically sleeved on the outer sides of both ends of the guide roller (21); An adjustment mechanism is provided between the rear ends of the two limiting frames (11) for driving the two limiting frames (11) to move synchronously in opposite directions along the axial direction of the guide roller (21) to adjust the spacing. The extrusion mechanism is located above the guide roller (21). An adaptive component is installed between the extrusion mechanism and the limiting plate (6). Through the cooperation of the extrusion mechanism and the adaptive component, adaptive elastic extrusion of canvases of different thicknesses is achieved to ensure the stability of the canvas during the conveying process.

2. The adjustable fabric inlet of an oil painting coating machine according to claim 1, characterized in that, The adjustment mechanism includes: A connecting plate (4) is provided at the rear end of the two limiting frames (11). An adjustment groove (41) is provided on the connecting plate (4). An adjustment block (42) is slidably connected to both sides of the inner cavity of the adjustment groove (41). The two ends of the bidirectional lead screw (43) are rotatably connected to the two ends of the inner cavity of the adjusting groove (41) through sealed bearings, and the two adjusting blocks (42) are respectively threaded on the outer sides of the bidirectional lead screw (43).

3. The adjustable fabric inlet of an oil painting coating machine according to claim 1, characterized in that, The adaptive component includes: Two slide grooves (3) are respectively opened at opposite ends of the two limiting plates (6), and sliders (32) are slidably connected in both slide grooves (3). Two springs (33) are provided, one end of which is fixedly connected to the top of the inner cavity of the two slides (3), and the other end of which is fixedly connected to the two sliders (32).

4. The adjustable fabric inlet of an oil painting coating machine according to claim 3, characterized in that, The extrusion mechanism includes a pressure roller (1), which is located between two limit frames (11) above the guide roller (21). Both ends of the pressure roller (1) are fixedly connected to a rotating shaft (31), and the two rotating shafts (31) are rotatably connected to the two sliders (32) respectively through sealed bearings.

5. The adjustable fabric inlet of an oil painting coating machine according to claim 2, characterized in that, The connecting plate (4) has four corners near the limiting frame (11) with fixed bolts (44) that rotate through it.

6. The adjustable fabric inlet of an oil painting coating machine according to claim 2, characterized in that, The outer shaft of the bidirectional lead screw (43) is fitted with a telescopic bellows (45), and the bidirectional lead screw (43) does not contact the inner wall of the telescopic bellows (45).

7. The adjustable fabric inlet of an oil painting coating machine according to claim 4, characterized in that, Dust collection covers (53) are provided on the top of the pressure roller (1) and the bottom of the guide roller (21). Fixed rods (52) are fixedly connected between the bottom of the dust collection cover on the top of the pressure roller (1) and the slider (32). The two ends of the dust collection cover (53) at the bottom of the guide roller (21) are fixedly connected to the two limiting plates (6). A vacuum cleaner (5) is fixedly installed on one side of the limiting frame (11). A vacuum cleaner hose (51) is connected between the suction end of the vacuum cleaner (5) and the dust collection cover (53).

8. The adjustable fabric inlet of an oil painting coating machine according to claim 7, characterized in that, The dust collection hood (53) is provided with a sloping part (54) at one end near the pressure roller (1) and the guide roller (21), and the higher end of each sloping part (54) is in contact with the pressure roller (1) and the guide roller (21).

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