A printing press for double-sided labels

Abstract

The present application discloses a printing press for double-sided labels, which includes a printer body. The printer body is provided with a paper feeding port. One end of the printer body where the paper feeding port is opened is communicated with a paper tearing mechanism. The paper tearing mechanism includes a housing. A cavity is formed in the housing. The inner wall of the housing where the cavity is formed is provided with a first transfer roller and a second transfer roller for conveying label paper. The first transfer roller and the second transfer roller are arranged oppositely. A paper feeding channel for paper feeding is communicated between the first transfer roller and the second transfer roller. An outlet is formed at one end of the housing away from the printer body, and the outlet is communicated with the paper feeding channel. The other end of the paper feeding channel is communicated with the paper feeding port. A scraper for tearing off the upper printing paper and the lower printing paper is arranged at one end of the housing close to the outlet. The present application has the effect of facilitating the separation of the upper printing paper and the lower printing paper from the base material, and simplifies the labeling process.

Description

Technical Field

[0001] The present invention relates to the field of label printing equipment, and in particular to a printing machine for double-sided labels and its production process. Background Art

[0002] Since the introduction of self-adhesive label printing technology in China, this printing technology has entered a new development period with the development of China's economy. Various new materials, new technologies, and new models have emerged. With the continuous development of the packaging industry, the scope of application of self-adhesive labels has become wider and wider, making self-adhesive label printing technology widely used in various advertising and product packaging. Self-adhesive labels are composed of a base material, an upper printing paper, and a lower printing paper. The upper and lower surfaces of the base material are both oily papers to facilitate the separation of the upper and lower printing papers from the base material.

[0003] In related technologies, the self-adhesive web material is fixed on the roller shaft of the paper feeder, passes through a guide roller, a tension control roller, etc., reaches the printing unit, and finally is recycled to the roller shaft of the delivery machine.

[0004] Regarding the above-mentioned related technologies, the label paper is pasted on the corresponding equipment after printing. The inventor believes that its shortcoming is that after printing, the printed label paper is first centrally wound onto the roller shaft of the delivery machine, and then later pasted onto the object by the staff one by one, and the pasting process is rather cumbersome. Summary of the Invention

[0005] In order to improve the problem that the pasting process is rather cumbersome when the label printed by a double-sided printer is pasted on an object, the present application provides a printing machine for double-sided labels.

[0006] A printing machine for double-sided labels and its production process provided by the present application adopt the following technical solutions:

[0007] In a first aspect, a printing machine for double-sided labels provided by the present application includes a printer body. The printer body is provided with a paper feeding port. One end of the printer body where the paper feeding port is opened is communicated with a paper tearing mechanism. The paper tearing mechanism includes a housing. A cavity is formed inside the housing. The inner wall of the housing where the cavity is formed is provided with a first transfer roller and a second transfer roller for conveying label paper. The first transfer roller and the second transfer roller are arranged opposite to each other. A paper feeding channel for paper feeding is communicated between the first transfer roller and the second transfer roller. One end of the housing away from the printer body is provided with a paper outlet. The paper outlet is communicated with the paper feeding channel. The other end of the paper feeding channel is communicated with the paper feeding port. A scraper for tearing off the upper printing paper and the lower printing paper is arranged at one end of the housing near the paper outlet.

[0008] By adopting the above technical solution, after the printing machine finishes printing the label paper, the label paper enters the paper feeding channel. The first conveying roller and the second conveying roller provide power to make the label paper move forward. When the label paper moves to the scraper, the scraper scrapes off the upper printing paper and the lower printing paper from the substrate. The staff can directly stick the label paper separated from the substrate on the corresponding object, reducing the processes of winding the label paper and the staff tearing the label, and simplifying the working process.

[0009] Optionally, the scraper is rotatably arranged in the shell, the rotation direction of the scraper is perpendicular to the vertical channel. The paper tearing mechanism includes a first guiding roller, the first guiding roller is rotatably arranged in the shell, the first guiding roller is located below the paper feeding channel and is in clearance fit with the scraper. A rotary channel is formed between the first guiding roller and the scraper. One end of the rotary channel away from the first guiding roller is communicated with the paper feeding channel. A third guiding roller for guiding the label paper to enter the scraper through the rotary channel and the paper feeding channel is also rotatably arranged in the shell. The surface of the third guiding roller is made of silica gel. A cutting mechanism is also arranged in the shell.

[0010] By adopting the above technical solution, when the label paper first passes by the scraper after entering the paper feeding channel, the cutting mechanism cuts off the label paper, and the first conveying roller and the second conveying roller pause to transport the subsequent label paper. The scraper first separates the upper printing paper from the substrate, and the upper printing paper is output from the paper outlet. The staff first stick the upper printing paper on the object in sequence. At the same time, the lower printing paper and the substrate are adhered together and enter the rotary channel under the action of the first guiding roller. And due to the setting of the third guiding roller, it moves to the scraper again through the paper feeding channel. At this time, the scraper rotates 180 degrees, and the cutter head is aligned with the lower printing paper to separate the lower printing paper from the substrate. The staff can then stick the lower printing paper on the object in sequence. At the same time, the first conveying roller and the second conveying roller continue to transport the label paper to perform the next degumming work.

[0011] Optionally, the paper tearing mechanism further includes a second guiding roller, the second guiding roller is rotatably arranged in the shell, the second guiding roller is located above the paper feeding channel and is in clearance fit with the scraper. A waste material channel is formed between the second guiding roller and the scraper. One end of the waste material channel away from the second guiding roller is communicated with a substrate recycling box.

[0012] By adopting the above technical solution, when the label paper moves to the scraper for the second time, the lower printing paper is output from the paper outlet, and the substrate moves towards the substrate recycling box under the action of the second guiding roller and is finally collected, which has the beneficial effect of facilitating the collection of substrate waste materials.

[0013] Optionally, a cooling roller is further arranged in the shell, the inside of the cooling roller is hollow, and the cooling roller is connected to an external water tank.

[0014] By adopting the above technical solution, water is continuously fed into the cooling roller from the external water tank, and the cooling roller cools the label paper, making the printed label paper clearer and not easily smeared.

[0015] Optionally, the cooling roller is slidably connected to the housing. The housing is connected with a first cylinder for driving the cooling roller to slide. The housing is provided with a chute for the cooling roller to slide, and the paper feeding channel is provided with a through groove for the cooling roller to insert.

[0016] By adopting the above technical solution, while the cooling roller cools the label paper, the first cylinder can be extended or shortened to control the up-and-down sliding of the cooling roller in the vertical direction, which has the beneficial effect of adjusting the tension of the label paper in the housing.

[0017] Optionally, a second cylinder is hinged to the side wall of the housing. The output shaft of the second cylinder is connected with a connecting rod. The end of the connecting rod away from the second cylinder is hinged to the first guiding roller. The first guiding roller is slidably connected to the housing. The housing is provided with a chute for the first guiding roller to slide up and down. The connecting rod is provided with a through hole for the output shaft of the second cylinder to insert. After the output shaft of the second cylinder is inserted into the connecting rod, a limiting block for limiting the output shaft of the second cylinder is fixedly connected, and the housing is provided with a chute for the first guiding roller to slide.

[0018] By adopting the above technical solution, when the second cylinder extends, the second cylinder drives the connecting rod and the first guiding roller to move upward, making the first guiding roller away from the second guiding roller. At this time, the first guiding roller and the second guiding roller can no longer apply friction force to the label paper, so that the label paper pauses to be conveyed forward.

[0019] Optionally, a sensor is arranged in the housing. The sensor is connected with a controller. The sensor is arranged at the scraper for detecting whether a label passes through this position. When the processor senses that an odd number of labels pass through, the processor controls the second cylinder to extend. When the processor senses that an even number of labels pass through, the processor controls the second cylinder to shorten.

[0020] By adopting the above technical solution, the running condition of the label is detected by the sensor, and then the processor controls the extension and shortening of the second cylinder, thereby controlling the transportation of the label and reducing the labor intensity of the staff.

[0021] Optionally, a cleaning roller is connected to the bottom of the cooling roller. The surface of the cleaning roller is provided with bristles. The end of the cleaning roller is connected with a telescopic mechanism. The end of the telescopic mechanism away from the cleaning roller is connected with the cooling roller. A gap for the self-adhesive to pass through is arranged between the cooling roller and the cleaning roller. The cleaning roller is provided with a motor for driving the cleaning roller to rotate.

[0022] By adopting the above technical solution, the label paper passes between the cooling roller and the cleaning roller. The cooling roller cools the label paper, and the bristles on the surface of the cleaning roller brush off the impurities on the surface of the adhesive. Under the action of the telescopic rod, the cleaning roller moves closer to and away from the cooling roller, continuously adjusting the size of the gap between the cleaning roller and the cooling roller, making it easier for the label paper to pass through and achieving a better cleaning effect.

[0023] Optionally, the telescopic mechanism includes a cylinder, a special-shaped rod, a connecting rod, and a piston rod. The special-shaped rod is connected to the end of the cleaning roller. One end of the special-shaped rod away from the cleaning roller is connected to a motor, which is used to drive the special-shaped rod and the cleaning roller to rotate coaxially. One end of the connecting rod is rotatably connected to the special-shaped rod, and the other end of the connecting rod is rotatably connected to the piston rod. The cylinder is fixedly connected to the end of the cooling roller. A limiting block is fixedly connected to the end of the piston rod away from the connecting rod. The cylinder is provided with a sliding groove for the limiting block to slide. When the piston rod moves away from the cooling roller, the limiting block abuts against the inner wall of the sliding groove opened in the cylinder. The motor is fixedly connected with an L-shaped rod, and the housing is provided with a limiting groove for the L-shaped rod to slide in the vertical direction.

[0024] By adopting the above technical solution, when the motor works, the cleaning roller rotates itself, and at the same time the motor drives the special-shaped rod to rotate. Due to the limitation of the limiting groove, the special-shaped rod drives the connecting rod and the piston rod to move in the vertical direction, so that the cleaning roller moves towards and away from the cooling roller. The cleaning effect of the cleaning roller is better, and at the same time, the size of the gap between the cleaning roller and the cooling roller is adjusted.

[0025] On the second hand, the present application provides a production process for double-sided labels, which specifically includes the following steps:

[0026] S1. The printer body prints on the upper printing paper and the lower printing paper of the label paper at the same time, and then outputs them through the paper feeding port;

[0027] S2. The label paper enters the paper tearing mechanism, and the paper tearing mechanism tears off the upper printing paper of the label paper and outputs the upper printing paper through the paper outlet;

[0028] S3. The paper tearing mechanism tears off the lower printing paper and outputs it through the paper outlet;

[0029] S4. After the tearing is completed, the base paper enters the waste paper channel and finally enters the base material recycling box for unified collection.

[0030] By adopting the above technical solution, the paper tearing mechanism sequentially peels off the upper printing paper and the lower printing paper. The staff can paste the printing paper on the object at the same time, and the base material waste can be better collected after the peeling is completed.

[0031] In summary, the present application includes at least one of the following beneficial effects:

[0032] After the printing press finishes printing the label paper, the label paper enters the paper feeding channel. The first conveying roller and the second conveying roller provide power to make the label paper move forward. When the label paper moves to the scraper, the scraper scrapes off the upper printing paper and the lower printing paper from the substrate. The staff can directly stick the label paper separated from the substrate on the corresponding object, reducing the processes of winding the label paper and the staff tearing the label, and simplifying the working process. Description of the Drawings

[0033] Figure 1 is a schematic structural diagram of a label paper printing press in the related art.

[0034] Figure 2 is a three-dimensional

[0035] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0036] Figure 4 is a schematic structural diagram of a printing press for double-sided labels according to an embodiment of the present application.

[0037] Figure 5 is a schematic structural diagram of the first cylinder and the second cylinder of a printing press for double-sided labels according to an embodiment of the present application.

[0038] Description of the reference numerals: 1. Printer body; 2. Paper feeding port; 3. Paper tearing mechanism; 4. Housing; 5. Cavity; 6. First conveying roller; 7. Second conveying roller; 8. Paper feeding channel; 9. Paper outlet; 10. Scraper; 11. First guiding roller; 12. Second guiding roller; 13. Third guiding roller; 14. Rotary channel; 15. Waste channel; 16. Substrate recycling box; 17. Cooling roller; 18. First cylinder; 19. Second cylinder; 20. Connecting rod; 21. Limit block; 22. Sensor; 23. Cleaning roller; 24. Brush bristles; 25. Telescopic mechanism; 26. Cylinder; 27. Special-shaped rod; 28. Connecting rod; 29. Piston rod; 30. L-shaped rod; 31. Paper collecting machine; 32. Guiding roller; 33. Tension control roller; 34. Printing unit; 35. Cutting mechanism; 36. Motor. Detailed Description of the Embodiment

[0039] The following will Figure 2 be further described in detail with reference to Figure 5 the attached drawings to the present application.

[0040] An embodiment of the present application discloses a printing press for double-sided labels. Refer to Figure 2, A printing press for double-sided labels includes a printer body 1 and a paper tearing mechanism 3. The paper tearing mechanism 3 includes a housing 4. A base material recycling box 16 is provided on the housing 4. The base material recycling box 16 is connected to a waste material channel 15. The housing 4 is provided with a through groove for inserting the waste material channel 15.

[0041] Refer to Figure 3 and Figure 4 , The printer body 1 is provided with a paper feeding port 2. A paper feeding channel 8 for transporting labels penetrates through the housing 4. One end of the waste material channel 15 far from the base material recycling box 16 is connected to the paper feeding channel 8. A first conveying roller 6 and a second conveying roller 7 for controlling the movement of the labels are arranged in the housing 4. The first conveying roller 6 is located above the paper feeding channel 8, and the second conveying roller 7 is located below the paper feeding channel 8. A gap for the label to pass through is left between the first conveying roller 6 and the second conveying roller. The paper feeding channel 8 is provided with through grooves for inserting the first conveying roller 6 and the second conveying roller 7. A cutting mechanism 35 for cutting the labels is further arranged in the housing 4. The cutting mechanism 35 is located above the paper feeding channel 8, and the paper feeding channel 8 is provided with a groove for inserting the cutting mechanism 35.

[0042] Refer to Figure 3 and Figure 4 , A cooling roller 17 is also slidably arranged in the housing 4. The cooling roller 17 is hollow inside and is connected to an external water source. The cooling roller 17 is located above the paper feeding channel 8. A cleaning roller 23 is arranged at the bottom of the cooling roller 17. The paper feeding channel 8 is provided with a through groove for the cooling roller 17 to slide up and down. A number of bristles 24 are distributed on the surface of the cleaning roller 23. The cutting mechanism 35 is located between the cooling roller 17 and the first conveying roller 6. One end of the housing 4 far from the printer body 1 is provided with a paper outlet 9. The paper outlet 9 is connected to the paper feeding channel 8. A scraper 10 for separating the upper printed paper, the lower printed paper from the base material is rotatably arranged on the inner side wall of the housing 4 near the paper outlet 9. The scraper 10 is rotatably arranged in the housing 4, and the rotation direction of the scraper 10 is perpendicular to the paper feeding channel 8. The housing 4 is provided with a driving mechanism (not shown) for driving the scraper 10 to rotate.

[0043] Refer to Figure 3 and Figure 4, the paper tearing mechanism 3 further includes a horizontally arranged first guide roller 11 and a second guide roller 12. Both the first guide roller 11 and the second guide roller 12 are rotatably arranged in the housing 4. The first guide roller 11 is located below the paper feeding channel 8 and is in clearance fit with the scraper 10. A rotary channel 14 is formed between the first guide roller 11 and the scraper 10. One end of the rotary channel 14 away from the first guide roller 11 is communicated with the paper feeding channel 8. A third guide roller 13 for circulating and rotating the label paper in the rotary channel 14 is also rotatably arranged in the housing 4. The surface of the third guide roller 13 is made of silica gel. The second guide roller 12 is located above the paper feeding channel 8 and is in clearance fit with the scraper 10. A waste material channel 15 is formed between the second guide roller 12 and the scraper 10. One end of the waste material channel 15 away from the second guide roller 12 is communicated with the base material recycling box 16.

[0044] Refer to Figure 3 and Figure 4 , a telescopic mechanism 25 is connected to the end of the cleaning roller 23. The cleaning roller 23 is connected to the cooling roller 17 through the telescopic mechanism 25. The housing 4 is connected with a motor 36 for driving the cleaning roller 23 to rotate. The telescopic mechanism 25 includes a cylinder 26, a special-shaped rod 27, a connecting rod 28 and a piston rod 29. The special-shaped rod 27 is connected to the end of the cleaning roller 23. The motor 36 is connected to the end of the special-shaped rod 27 away from the cleaning roller 23. The motor 36 is used to drive the special-shaped rod 27 and the cleaning roller 23 to rotate coaxially. And the motor 36 is fixedly connected with an L-shaped rod 30. The housing 4 is provided with a limiting groove for the vertical sliding of the L-shaped rod 30. One end of the connecting rod 28 is rotatably connected to the special-shaped rod 27, and the other end of the connecting rod 28 is rotatably connected to the piston rod 29. The cylinder 26 is fixedly connected to the end of the cooling roller 17 and is located at the bottom of the cooling roller 17. The end of the piston rod 29 away from the connecting rod 28 is fixedly connected with an abutting block (not shown in the figure). The cylinder 26 is provided with a sliding groove for the abutting block to slide. When the piston rod 29 moves away from the cooling roller 17, the abutting block abuts against the inner wall of the sliding groove opened in the cylinder 26.

[0045] Refer to Figure 4 and Figure 5, a first cylinder 18 for driving the cooling roller 17 to slide is connected to the side wall of the housing 4. The housing 4 is provided with a sliding groove for the cooling roller 17 to slide, and the paper feeding channel 8 is provided with a through groove for the cooling roller 17 to insert; a second cylinder 19 is connected to the side wall of the housing 4. The output shaft of the second cylinder 19 is connected to a connecting rod 20. One end of the connecting rod 20 away from the second cylinder 19 is connected to the first guide roller 11. The first guide roller 11 is slidably connected to the housing 4. The connecting rod 20 is provided with a through hole for the output shaft of the second cylinder 19 to insert. After the output shaft of the second cylinder 19 is inserted into the connecting rod 20, a limiting block 21 for limiting the output shaft of the second cylinder 19 is fixedly connected. The housing 4 is provided with a sliding groove for the first guide roller 11 to slide. A sensor 22 is arranged inside the housing 4. The sensor 22 is arranged at the scraper 10 for detecting whether a label passes through this position. The sensor 22 is connected to the controller. When the processor senses that an odd number of labels pass through, the processor controls the second cylinder 19 to extend. When the processor senses that an even number of labels pass through, the processor controls the second cylinder 19 to shorten. The sensor 22 and the processor here are prior arts and will not be elaborated in detail in this application.

[0046] The implementation principle of a printing machine for double-sided labels in an embodiment of the present application is as follows: After the printer body 1 finishes printing the label paper, the label paper is output from the paper feeding port 2 and enters the paper feeding channel 8. The first conveying roller 6 and the second conveying roller 7 provide friction force to the label paper to make it move forward. The cooling roller 17 cools the surface of the label paper. At the same time, during the rotation of the cleaning roller 23, the impurities on the surface of the label paper are wiped off. When the label paper moves to the scraper 10, the processor controls the second cylinder 19 to extend and controls the first conveying roller 6 to move upward. At this time, the first conveying roller 6 is away from the second conveying roller 7, and the label paper pauses moving. The cutting mechanism 35 cuts off the label paper; when starting to work, the cutting edge of the scraper 10 faces upward and separates the upper printing paper from the base material. The upper printing paper is output from the paper outlet 9. The staff can paste the upper printing paper on an object at the same time. At this time, the lower printing paper and the base material enter the rotary channel 14 and re-enter the paper feeding channel 8 for paper removal work. The scraper 10 rotates, and at this time the cutting edge of the scraper 10 faces downward. When the label paper enters the scraper 10 again, the processor controls the second cylinder 19 to shorten and controls the first conveying roller 6 to move downward. At this time, the first conveying roller 6 approaches the second conveying roller 7 and provides the friction force for the label paper to move forward again, so that the label paper continues to move forward. The scraper 10 scrapes off the lower printing paper and the base material. The lower printing paper is output from the paper outlet 9, and then the base material enters the waste material channel 15 and is recycled by the base material recycling box 16.

[0047] An embodiment of the present application also discloses a production process for double-sided labels, including the following operating steps:

[0048] S1. The printer body 1 prints the upper printing paper and the lower printing paper of the label paper simultaneously and then outputs them through the paper feeding port 2;

[0049] S2. The label paper enters the paper tearing mechanism 3, and the paper tearing mechanism 3 tears off the upper printing paper of the label paper and the upper printing paper is output through the paper outlet 9;

[0050] S3. The paper tearing mechanism 3 tears off the lower printing paper and outputs it through the paper outlet 9;

[0051] S4. After the tearing is completed, the base paper enters the waste channel 15 and finally enters the base material recycling bin 16 for unified collection.

[0052] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A printing press for double-sided labels, comprising a printer body (1), and a paper feeding port (2) is provided on the printer body (1), characterized in that: One end of the printer body (1) where the paper feed port (2) is opened is communicated with a paper tearing mechanism (3). The paper tearing mechanism (3) includes a housing (4). A cavity (5) is formed in the housing (4). On the inner wall of the housing (4) where the cavity (5) is formed, there are a first transfer roller (6) and a second transfer roller (7) for conveying label paper. The first transfer roller (6) and the second transfer roller (7) are arranged oppositely. A paper feed channel (8) for paper feeding is communicated between the first transfer roller (6) and the second transfer roller (7). An outlet (9) is formed at one end of the housing (4) away from the printer body (1). The outlet (9) is communicated with the paper feed channel (8). The other end of the paper feed channel (8) is communicated with the paper feed port (2). At one end of the housing (4) near the outlet (9), there is a scraper (10) for tearing off the upper printing paper and the lower printing paper. The scraper (10) is rotatably arranged in the housing (4). The rotation direction of the scraper (10) is perpendicular to the paper feed channel (8). The paper tearing mechanism (3) includes a first guide roller (11). The first guide roller (11) is rotatably arranged in the housing (4). The first guide roller (11) is located below the paper feed channel (8) and is in clearance fit with the scraper (10). A rotary channel (14) is formed between the first guide roller (11) and the scraper (10). One end of the rotary channel (14) away from the first guide roller (11) is communicated with the paper feed channel (8). A third guide roller (13) for guiding the label paper to pass through the rotary channel (14), the paper feed channel (8) and enter the scraper (10) is also rotatably arranged in the housing (4). The surface of the third guide roller (13) is made of silica gel. A cutting mechanism (35) is also arranged in the housing (4). The paper tearing mechanism (3) further includes a second guide roller (12). The second guide roller (12) is rotatably arranged in the housing (4). The second guide roller (12) is located above the paper feed channel (8) and is in clearance fit with the scraper (10). A waste material channel (15) is formed between the second guide roller (12) and the scraper (10). One end of the waste material channel (15) away from the second guide roller (12) is communicated with a base material recycling box (16). A cooling roller (17) is also arranged in the housing (4). The inside of the cooling roller (17) is hollow, and the cooling roller (17) is connected to an external water tank.

2. The printing press for double-sided labels according to claim 1, characterized in that: The cooling roller (17) is slidably connected to the housing (4). The housing (4) is connected with a first cylinder (18) for driving the cooling roller (17) to slide. The housing (4) is provided with a sliding groove for the cooling roller (17) to slide. The paper feed channel (8) is provided with a through groove for the cooling roller (17) to insert.

3. A printing press for double-sided labels according to claim 1, characterized in that: A second cylinder (19) is connected to the side wall of the housing (4). The output shaft of the second cylinder (19) is connected to a connecting rod (20). One end of the connecting rod (20) away from the second cylinder (19) is connected to the first guide roller (11). The first guide roller (11) is slidably connected to the housing (4). The connecting rod (20) is provided with a through hole for the output shaft of the second cylinder (19) to insert. After the output shaft of the second cylinder (19) inserts into the connecting rod (20), a limiting block (21) for limiting the output shaft of the second cylinder (19) is fixedly connected. The housing (4) is provided with a sliding groove for the first guide roller (11) to slide.

4. A printing press for double-sided labels according to claim 3, characterized in that: A sensor (22) is arranged in the housing (4). The sensor (22) is connected to a controller. The sensor (22) is arranged at the scraper (10) for detecting whether a label passes through this position. When the processor senses that an odd number of labels pass through, the processor controls the second cylinder (19) to extend. When the processor senses that an even number of labels pass through, the processor controls the second cylinder (19) to shorten.

5. A printing press for double-sided labels according to claim 4, characterized in that: A cleaning roller (23) is connected to the bottom of the cooling roller (17). Brush hairs (24) are arranged on the surface of the cleaning roller (23). One end of the cleaning roller (23) is connected to a telescopic mechanism (25). One end of the telescopic mechanism (25) away from the cleaning roller (23) is connected to the cooling roller (17). A gap for the self-adhesive to pass through is arranged between the cooling roller (17) and the cleaning roller (23). The housing (4) is provided with a motor (36) for driving the cleaning roller (23) to rotate.

6. The printing press for double-sided labels according to claim 5, characterized in that: The telescopic mechanism (25) includes a cylinder body (26), a special-shaped rod (27), a connecting rod (28) and a piston rod (29). The special-shaped rod (27) is connected to the end of the cleaning roller (23). The motor (36) is connected to one end of the special-shaped rod (27) away from the cleaning roller (23). The motor (36) is used for driving the special-shaped rod (27) and the cleaning roller (23) to rotate coaxially. One end of the connecting rod (28) is rotatably connected to the special-shaped rod (27). The other end of the connecting rod (28) is rotatably connected to the piston rod (29). The cylinder body (26) is fixedly connected to the end of the cooling roller (17). A contact block is fixedly connected to one end of the piston rod (29) away from the connecting rod (28). The cylinder body (26) is provided with a sliding groove for the contact block to slide. When the piston rod (29) is away from the cooling roller (17), the contact block abuts against the inner wall of the sliding groove opened in the cylinder body (26). The motor (36) is fixedly connected with an L-shaped rod (30). The housing (4) is provided with a limiting groove for the L-shaped rod (30) to slide in the vertical direction.

7. A production process for double-sided labels, applied to a double-sided label printing machine as described in claims 1-6, characterized in that It includes the following operation steps: S1. The printer body (1) prints on the upper printing paper and the lower printing paper of the label paper simultaneously, and then outputs them through the paper feeding port (2). S2. The label paper enters the paper tearing mechanism (3). The paper tearing mechanism (3) tears off the upper printing paper of the label paper and the upper printing paper is output through the paper outlet (9). S3. The paper tearing mechanism (3) tears off the lower printed paper and outputs it through the paper outlet (9); S4. After the tearing is completed, the base paper enters the waste paper channel (15) and finally enters the base material recycling bin (16) for unified collection; Among them, in step S2, the initial cutter head of the scraper faces upward. The first conveyor roller and the second conveyor roller drive the label paper to move to the scraper. After the sensor detects the arrival of the label paper, the processor controls the second cylinder to extend, causing the first conveyor roller to move upward away from the second conveyor roller, and the label paper stops being conveyed. The scraper separates the upper printed paper from the base material, and the upper printed paper is output from the paper outlet; In step S3, the base material and the lower printed paper re-enter the paper feeding channel through the rotary channel. The scraper rotates 180° so that the cutter head faces downward. After the sensor detects the arrival of the label paper again, the processor controls the second cylinder to shorten, and the first conveyor roller moves downward close to the second conveyor roller to drive the label paper to move forward again. The scraper separates the lower printed paper from the base material, and the lower printed paper is output from the paper outlet.

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