Automatic dustless cloth wiping mechanism

Abstract

This utility model belongs to the field of automated cleaning technology, specifically providing an automatic lint-free cloth wiping mechanism, including a frame. A lint-free cloth feeding component, a wiping component, and an alcohol supply component are mounted on the frame. The lint-free cloth contacts the product under the force of the wiping component. The wiping component includes a Z-axis motor, a mounting bracket, and two wiping heads. The Z-axis motor is fixedly mounted on the frame via a first bracket, which is fixedly connected to the output shaft of the Z-axis motor and slidably connected to the frame under the drive of the Z-axis motor. The two wiping heads are arranged relatively at intervals on the mounting bracket, with their bottom ends extending beyond the mounting bracket. The two wiping heads are connected to the alcohol supply component. Under the drive of the Z-axis motor, the two wiping heads respectively contact two lint-free cloths, and the two lint-free cloths respectively abut against two products under the action of the two wiping heads. This utility model can achieve automated cleaning and simultaneously wipe two products, improving cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automated cleaning technology, and specifically to an automatic dust-free cloth wiping mechanism. Background Technology

[0002] In the field of industrial automation, display screens require cleaning with lint-free cloths soaked in alcohol. Patent application CN114643256A discloses a glass cover cleaning device, specifically employing a high-speed rodless cylinder to simulate manual wiping, and a combination of an alcohol nozzle and a reciprocating roller assembly to simulate the manual handling of wet and dry cloths, achieving a high degree of automation in the glass panel cleaning process. However, this patent application can only clean one product at a time, resulting in low cleaning efficiency. Furthermore, the lack of feedback on wiping pressure can easily damage the product. Utility Model Content

[0003] To address the technical problems in the prior art, this utility model provides an automatic cleanroom wipe mechanism, including a frame. A cleanroom wipe feeding component, a wiping component, and an alcohol supply component are mounted on the frame. The cleanroom wipe feeding component releases cleanroom wipes along the product's moving direction under the drive of a drive component. The wiping component is connected to the alcohol supply component and is located above the cleanroom wipes. The cleanroom wipes contact the products under the force of the wiping component. The wiping component includes a Z-axis motor, a mounting bracket, and two wiping heads. The Z-axis motor is fixedly mounted on the frame via a first bracket. The mounting bracket is fixedly connected to the output shaft of the Z-axis motor and slidably connected to the frame under the drive of the Z-axis motor, with the sliding direction being vertical. The two wiping heads are arranged relatively at intervals on the mounting bracket, with their bottom ends extending beyond the mounting bracket. The two wiping heads are connected to the alcohol supply component. Under the drive of the Z-axis motor, the two wiping heads respectively contact two cleanroom wipes, and the two cleanroom wipes respectively abut against two products under the action of the two wiping heads.

[0004] Furthermore, the wiping assembly also includes a second bracket and two pressure sensors. Each pressure sensor corresponds to one of the wiping heads. The two pressure sensors are fixedly connected to the mounting bracket via the second bracket. The two wiping heads are slidably connected to the second bracket, and the top of each wiping head contacts the pressure sensor. The two pressure sensors are connected to the Z-axis motor via a controller. When the pressure value of the pressure sensor reaches a set value, the controller controls the Z-axis motor to stop working via a signal.

[0005] Furthermore, two wiping cylinders are also fixedly installed on the second bracket, and the telescopic ends of the two wiping cylinders are respectively connected to two wiping heads.

[0006] Furthermore, the mounting bracket includes a first mounting plate, a second mounting plate, and a Y-axis motor. The first mounting plate is fixedly connected to the output shaft of the Z-axis motor and is slidably connected to the frame in the vertical direction under the drive of the Z-axis motor. The second mounting plate is slidably connected to the first mounting plate in the horizontal direction. The two wiping heads are mounted on the second mounting plate. The Y-axis motor is fixedly mounted on the first bracket and located on one side of the Z-axis motor. A limiting groove is provided on the side of the second mounting plate away from the wiping heads. An eccentric wheel that cooperates with the limiting groove is fixedly provided on the output shaft of the Y-axis motor. The two wiping heads reciprocate along the width direction of the two cleanroom cloths under the drive of the Y-axis motor.

[0007] Furthermore, the width of the wiping head is greater than the width of the lint-free cloth, and the wiping head always covers the width of the lint-free cloth.

[0008] Furthermore, the alcohol supply assembly includes an alcohol pressure tank and a needle valve. The alcohol pressure tank is fixedly installed on the frame and has a feeding port and a discharging port. The discharging port is connected to two wiping heads through the needle valve.

[0009] Furthermore, the alcohol dispensing assembly also includes a filter installed between the needle valve and the wiping head.

[0010] Furthermore, the alcohol supply assembly also includes a leakage detection sensor, which is mounted on the frame and close to the alcohol pressure tank.

[0011] Furthermore, an air knife is slidably mounted on the frame, and the sliding direction is the product's moving direction. The air knife is located on the side of the cleanroom cloth feeding assembly closer to the product's forward direction and above the product. The air knife has several air holes facing the product. The air knife is connected to an air pump and is controlled by a solenoid valve.

[0012] Beneficial effects: 1. In this utility model, by setting up a dust-free cloth feeding component, an alcohol supply component, and a wiping component including a Z-axis motor, a mounting bracket, and two wiping heads, automated cleaning can be achieved, and two products can be wiped simultaneously, thereby improving cleaning efficiency.

[0013] 2. In this utility model, the setting of a second bracket, two pressure sensors, and a controller can effectively control the wiping and cleaning force, avoiding damage to the product. Specifically, the Z-axis motor drives the wiping head to move towards the product through the mounting bracket. When the pressure value between the wiping head and the product reaches the set value, the pressure sensor sends a signal to the controller. The controller receives the signal from the pressure sensor and outputs a signal to the control circuit of the Z-axis motor, forcibly stopping the Z-axis motor. In addition, the controller can also provide real-time feedback on the specific force value between the pressure sensor and the product. By setting two wiping cylinders, the initial pressure value between the wiping head and the pressure sensor can be appropriately adjusted to ensure the synchronization of the two wiping heads. At the same time, the distance that the bottom of the wiping head slides out of the bottom of the mounting bracket can also be adjusted, thereby meeting the wiping and cleaning needs of products with different thicknesses.

[0014] 3. In this utility model, the arrangement of the first mounting plate, the second mounting plate, the Y-axis motor, the limiting groove, and the eccentric wheel ensures that the alcohol on the lint-free cloth is evenly soaked; by setting the width of the wiping head to be greater than the width of the lint-free cloth, the entire lint-free cloth can effectively contact the product, increasing the cleaning area and ensuring uniform friction between the two.

[0015] 4. In this utility model, the setting of alcohol pressure tank and needle valve can realize the quantitative addition of alcohol and avoid waste; combined with the setting of filter, the alcohol soaked in lint-free cloth can be filtered to prevent alcohol from spilling onto the lint-free cloth and causing product contamination; the setting of leakage detection sensor can detect whether alcohol leakage occurs in real time and improve safety performance.

[0016] 5. In this utility model, the sliding installation of the air knife enables the drying of the product after wiping and cleaning, avoiding the impact of residual alcohol on subsequent processes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall installation structure of this utility model in one direction; Figure 2 This is a schematic diagram of the overall installation structure of this utility model from another direction; Figure 3 for Figure 1 Detailed structural diagram at point A; Figure 4 for Figure 2 Detailed structural diagram of section B.

[0019] Explanation of reference numerals in the attached figures: 1. Frame; 2. Cleanroom wipe feeding assembly; 21. Unloading roll; 22. Rewind roll; 23. Drive roller; 24. Torque motor; 3. Wiping assembly; 31. Z-axis motor; 32. Mounting bracket; 321. First mounting plate; 322. Second mounting plate; 323. Y-axis motor; 33. Wiping head; 34. First bracket; 35. Second bracket; 36. Pressure sensor; 37. Wiping cylinder; 4. Alcohol supply assembly; 5. Drive assembly; 51. Third bracket; 52. Drive wheel; 53. Roller; 54. Pressing cylinder; 6. Limiting groove; 7. Air knife. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 application 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 application.

[0022] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] This utility model provides an automatic dust-free cloth wiping mechanism, such as... Figures 1 to 4As shown, the system includes a frame 1, on which a cleanroom cloth feeding assembly 2, a wiping assembly 3, and an alcohol supply assembly 4 are mounted. The cleanroom cloth feeding assembly 2 releases cleanroom cloth along the product's moving direction under the drive of a drive assembly 5. The wiping assembly 3 is connected to the alcohol supply assembly 4 and is located above the cleanroom cloth. The cleanroom cloth contacts the product under the force of the wiping assembly 3. The wiping assembly 3 includes a Z-axis motor 31, a mounting bracket 32, and two wiping heads 33. The Z-axis motor 31 is fixedly mounted on the frame 1 via a first bracket 34. The mounting bracket 32 ​​is fixedly connected to the output shaft of the Z-axis motor 31 and slidably connected to the frame 1 under the drive of the Z-axis motor 31, with the sliding direction being vertical. Two wiping heads 33 are arranged relatively spaced on the mounting bracket 32, with their bottom ends extending beyond the mounting bracket 32. The two wiping heads 33 are connected to the alcohol supply assembly 4. Driven by the Z-axis motor 31, the two wiping heads 33 respectively contact two cleanroom wipes. The two cleanroom wipes, under the action of the two wiping heads 33, respectively abut against two products. The cleanroom wipe feeding assembly 2 includes two sets of... The feeding and take-up mechanism specifically includes a feeding roll 21, a take-up roll 22, several transmission rollers 23 disposed between the feeding roll 21 and the take-up roll 22, and a torque motor 24 for adjusting the tension of the cleanroom cloth. The feeding roll 21 and the take-up roll 22 are located on the upper sides of the wiping assembly 3, and several transmission rollers 23 are distributed on both sides of the wiping assembly 3, with multiple transmission rollers 23 symmetrically distributed below and close to the product. The driving assembly 5 includes a drive motor, a drive wheel 52, two rollers 53, and two clamping cylinders 54. The drive wheel 52 is connected by a third... The bracket 51 is rotatably mounted on the frame 1 and driven by the drive motor. Two clamping cylinders 54 are mounted on the third bracket 51, and their telescopic ends pass through the third bracket 51 and are fixedly connected to two rollers 53 respectively. A clamping space is formed between the two rollers 53 and the drive wheel 52. The two cleanroom wipes pass through the clamping space and are matched with the two rollers 53 respectively. Under the drive of the clamping cylinders 54, the two rollers 53 respectively abut against the two cleanroom wipes and the drive wheel 52. The drive motor drives the drive wheel 52 to rotate, thereby realizing the transfer of the cleanroom wipes from the unloading roll 21 to the take-up roll 22.

[0027] In this embodiment, by setting up the cleanroom cloth feeding component 2, the alcohol supply component 4, and the wiping component 3 including the Z-axis motor 31, the mounting bracket 32, and the two wiping heads 33, automated cleaning can be achieved, and two products can be wiped simultaneously, thus improving cleaning efficiency.

[0028] In this utility model, preferably, such as Figure 1 and Figure 3As shown, the wiping assembly 3 also includes a second bracket 35 and two pressure sensors 36. The pressure sensors 36 correspond one-to-one with the wiping heads 33. The two pressure sensors 36 are fixedly connected to the mounting bracket 32 ​​via the second bracket 35. The two wiping heads 33 are slidably connected to the second bracket 35, and the top of the wiping head 33 contacts the pressure sensor 36. The two pressure sensors 36 are connected to the Z-axis motor 31 via a controller. When the pressure value of the pressure sensor 36 reaches the set value, the controller controls the Z-axis motor 31 to stop working via a signal. Two wiping cylinders 37 are also fixedly installed on the second bracket 35. The telescopic ends of the two wiping cylinders 37 are respectively connected to the two wiping heads 33.

[0029] In this embodiment, the wiping cleaning force can be effectively controlled by the second bracket 35, two pressure sensors 36, and a controller to avoid damaging the product. Specifically, the Z-axis motor 31 drives the wiping head 33 to move towards the product via the mounting bracket 32. When the pressure value between the wiping head 33 and the product reaches the set value, the pressure sensor 36 sends a signal to the controller. The controller receives the signal from the pressure sensor 36 and outputs a signal to the control circuit of the Z-axis motor 31, forcibly stopping the Z-axis motor 31. In addition, the controller can also provide real-time feedback on the specific force value between the pressure sensor 36 and the product. By setting two wiping cylinders 37, the initial pressure value between the wiping head 33 and the pressure sensor 36 can be appropriately adjusted to ensure the synchronization of the two wiping heads 33. At the same time, the distance by which the bottom of the wiping head 33 slides out of the bottom of the mounting bracket 32 ​​can also be adjusted to meet the wiping cleaning needs of products with different thicknesses.

[0030] In this utility model, preferably, such as Figure 1 , Figure 3 and Figure 4 As shown, the mounting bracket 32 ​​includes a first mounting plate 321, a second mounting plate 322, and a Y-axis motor 323. The first mounting plate 321 is fixedly connected to the output shaft of the Z-axis motor 31 and is slidably connected to the frame 1 in the vertical direction under the drive of the Z-axis motor 31. The second mounting plate 322 is slidably connected to the first mounting plate 321 in the horizontal direction. Two wiping heads 33 are mounted on the second mounting plate 322. The Y-axis motor 323 is fixedly mounted on the first bracket 34 and located on one side of the Z-axis motor 31. A limiting groove 6 is provided on the side of the second mounting plate 322 away from the wiping heads 33. An eccentric wheel that cooperates with the limiting groove 6 is fixedly provided on the output shaft of the Y-axis motor 323. The two wiping heads 33 reciprocate along the width direction of the two cleanroom cloths under the drive of the Y-axis motor 323. The width of the wiping head 33 is greater than the width of the cleanroom cloth, and the wiping head 33 always covers the width of the cleanroom cloth.

[0031] In this embodiment, the arrangement of the first mounting plate 321, the second mounting plate 322, the Y-axis motor 323, the limiting groove 6, and the eccentric wheel ensures that the alcohol on the cleanroom cloth is evenly soaked. By setting the width of the wiping head 33 to be greater than the width of the cleanroom cloth, the entire cleanroom cloth can effectively contact the product, increasing the cleaning area and ensuring uniform friction between the two.

[0032] In this utility model, preferably, such as Figure 1 and Figure 2 As shown, the alcohol supply assembly 4 includes an alcohol pressure tank and a needle valve. The alcohol pressure tank is fixedly installed on the frame 1. The alcohol pressure tank is provided with a feeding port and a discharging port. The discharging port is connected to two wiping heads 33 through the needle valve. The alcohol supply assembly 4 also includes a filter, which is installed between the needle valve and the wiping head 33. The alcohol supply assembly 4 also includes a leakage detection sensor, which is installed on the frame 1 and close to the alcohol pressure tank.

[0033] In this embodiment, the alcohol pressure tank and needle valve enable quantitative alcohol addition, preventing waste. Specifically, when the product moves directly below the wiping head 33, the needle valve opens, and alcohol is delivered from the alcohol pressure tank to the needle valve under external pressure, then soaks onto the lint-free cloth via the wiping head 33. Combined with the filter, the alcohol soaked in the lint-free cloth is filtered, preventing spillage and product contamination. A leak detection sensor allows for real-time detection of any alcohol leaks, improving safety. For convenient alcohol concentration monitoring, an alcohol concentration detector can be installed inside the alcohol pressure tank to ensure the alcohol concentration meets the product wiping requirements.

[0034] In this utility model, preferably, such as Figure 1 and Figure 2 As shown, an air knife 7 is also slidably mounted on the frame 1, and the sliding direction is the product's moving direction. The air knife 7 is located on the side of the cleanroom cloth feeding assembly 2 close to the product's forward direction and above the product. The air knife 7 has several air holes facing the product. The air knife 7 is connected to an air pump and is controlled by a solenoid valve.

[0035] In this embodiment, by sliding the air knife 7, the product after wiping and cleaning can be dried, avoiding the impact of residual alcohol on subsequent processes.

[0036] Working principle, such as Figures 1 to 4As shown, the alcohol supply action is as follows: When the module moves the product under the wiping head 33, the alcohol supply component 4 starts supplying alcohol; the alcohol wiping action is as follows: After the alcohol supply component 4 is turned on, the Z-axis motor 31 descends. When the pressure of the wiping head 33 reaches the set value, the pressure sensor 36 will send a signal to the controller and control the Z-axis motor 31 to stop. The product starts to move, and the lint-free cloth starts to wipe along the X-axis under the operation of the drive motor. At the same time, under the operation of the Y-axis motor 323, the wiping head 33 is driven to swing back and forth along the Y-axis. When the wiping is completed, the alcohol supply component 4 is turned off, the Z-axis motor 31 rises, and the Y-axis motor 323 returns to the origin; the alcohol drying action is as follows: After wiping, the product continues to move under the air knife 7. The solenoid valve opens and blows out the set flow rate of air. Alternatively, the flow rate can be left unset and the product can be blown while moving. The entire wiping process is completed when the product has moved and been blown through its entire travel distance.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An automatic cleanroom wipe mechanism, comprising a frame (1), wherein a cleanroom wipe feeding assembly (2), a wiping assembly (3), and an alcohol supply assembly (4) are mounted on the frame (1), the cleanroom wipe feeding assembly (2) releases a cleanroom wipe along the moving direction of the product under the drive of a driving assembly (5), the wiping assembly (3) is connected to the alcohol supply assembly (4) and is located above the cleanroom wipe, the cleanroom wipe contacts the product under the force of the wiping assembly (3), characterized in that, The wiping assembly (3) includes a Z-axis motor (31), a mounting bracket (32), and two wiping heads (33). The Z-axis motor (31) is fixedly mounted on the frame (1) via a first bracket (34). The mounting bracket (32) is fixedly connected to the output shaft of the Z-axis motor (31) and is slidably connected to the frame (1) under the drive of the Z-axis motor (31), with the sliding direction being vertical. The two wiping heads (33) are arranged relatively at intervals on the mounting bracket (32), and their bottom ends extend out of the mounting bracket (32). The two wiping heads (33) are connected to the alcohol supply assembly (4). Under the drive of the Z-axis motor (31), the two wiping heads (33) respectively contact two cleanroom cloths. Under the action of the two wiping heads (33), the two cleanroom cloths respectively abut against two products.

2. The automatic cleanroom wiper mechanism according to claim 1, characterized in that, The wiping assembly (3) also includes a second bracket (35) and two pressure sensors (36). The pressure sensors (36) correspond one-to-one with the wiping heads (33). The two pressure sensors (36) are fixedly connected to the mounting bracket (32) through the second bracket (35). The two wiping heads (33) are slidably connected to the second bracket (35), and the top of the wiping head (33) is in contact with the pressure sensor (36). The two pressure sensors (36) are connected to the Z-axis motor (31) through the controller. When the pressure value of the pressure sensor (36) reaches the set value, the controller controls the Z-axis motor (31) to stop working through the signal.

3. The automatic cleanroom wiper mechanism according to claim 2, characterized in that, Two wiping cylinders (37) are also fixedly installed on the second bracket (35), and the telescopic ends of the two wiping cylinders (37) are respectively connected to the two wiping heads (33).

4. An automatic cleanroom wiper mechanism according to any one of claims 1 to 3, characterized in that, The mounting bracket (32) includes a first mounting plate (321), a second mounting plate (322), and a Y-axis motor (323). The first mounting plate (321) is fixedly connected to the output shaft of the Z-axis motor (31) and is slidably connected to the frame (1) in the vertical direction under the drive of the Z-axis motor (31). The second mounting plate (322) is slidably connected to the first mounting plate (321) in the horizontal direction. The two wiping heads (33) are mounted on the second mounting plate (322). The Y-axis motor (323) is fixedly mounted on the first bracket (34) and located on one side of the Z-axis motor (31). A limiting groove (6) is provided on the side of the second mounting plate (322) away from the wiping head (33). An eccentric wheel that cooperates with the limiting groove (6) is fixedly provided on the output shaft of the Y-axis motor (323). The two wiping heads (33) reciprocate along the width direction of the two cleanroom cloths under the drive of the Y-axis motor (323).

5. An automatic cleanroom wiper mechanism according to claim 4, characterized in that, The width of the wiping head (33) is greater than the width of the lint-free cloth, and the wiping head (33) always covers the width of the lint-free cloth.

6. The automatic cleanroom wiper mechanism according to claim 1, characterized in that, The alcohol supply assembly (4) includes an alcohol pressure tank and a needle valve. The alcohol pressure tank is fixedly installed on the frame (1). The alcohol pressure tank is provided with a feeding port and a discharging port. The discharging port is connected to two wiping heads (33) through the needle valve.

7. An automatic cleanroom wiper mechanism according to claim 6, characterized in that, The alcohol supply assembly (4) also includes a filter installed between the needle valve and the wiping head (33).

8. The automatic cleanroom wiper mechanism according to claim 7, characterized in that, The alcohol supply assembly (4) also includes a leakage detection sensor, which is mounted on the frame (1) and close to the alcohol pressure tank.

9. An automatic cleanroom wiper mechanism according to claim 1, characterized in that, An air knife (7) is also slidably mounted on the frame (1), and the sliding direction is the moving direction of the product. The air knife (7) is located on the side of the clean cloth feeding assembly (2) close to the product's forward direction and above the product. The air knife (7) has several air holes facing the product. The air knife (7) is connected to an air pump and is controlled by a solenoid valve.

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