Removing equipment for inferior-quality products of small-breadth printing labels

Abstract

The invention discloses rejecting equipment for inferior-quality products of small-breadth printing labels, relates to the technical field of printed matter detection, and is mainly used for solving the problem that a conveying mechanism of existing detection equipment needs to be temporarily stopped when the existing detection equipment is used for rejecting the inferior-quality products. According to the main structure, an inferior-quality product collecting unit is arranged under a non-defective product collecting unit in parallel, and an inferior-quality product adsorption conveying unit capable of conveying inferior-quality paper to the inferior-quality product collecting unit is arranged below a top surface adsorption conveying unit; a paper pressing plate is arranged between the top face adsorption conveying unit and the defective product adsorption conveying unit, a paper guiding plate is arranged on the paper output side of the paper pressing plate, and an air blowing nozzle located on the paper input side of the paper pressing plate is further arranged on the top face adsorption conveying unit. According to the rejecting equipment for the small-breadth printing label defective products, rejecting of defective paper can be achieved without pause of the equipment, adverse effects on the performance and stability of all the adsorption conveying units are avoided, and meanwhile the equipment detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of printed matter detection, and in particular to a device for removing defective small-format printed labels. Background Art

[0002] In the production process of cigarette boxes, wine boxes and other packaging boxes, different label patterns need to be printed on small-format paper according to the needs of the product or the customer. In such small-format printed paper, once a printing error occurs, the printed product needs to be scrapped. Therefore, in the actual production process, the printed small-format printed paper often needs to be tested by testing equipment, and the defective paper is eliminated.

[0003] However, the existing detection equipment mainly moves defective paper directly to the defective tray on one side of the conveyor line by mechanical pushing. This results in the conveying mechanism of the existing detection equipment temporarily pausing when rejecting defective paper, and restarting after the defective paper is rejected. Frequent start / stop will not only have a certain impact on the performance and stability of the conveying mechanism, but also affect the efficiency of detection. In addition, due to the lack of guidance, the rejected defective paper falls directly into the defective tray at high speed, so the defective paper is easily damaged during the high-speed falling process, and the defective paper rejected into the defective tray will also be cluttered and difficult to collect. Summary of the invention

[0004] The purpose of the present invention is to provide a device for rejecting defective small-format printed labels, which can reject defective products without pausing, thereby avoiding adverse effects on the performance and stability of each adsorption and conveying unit and improving the detection efficiency of the equipment.

[0005] The technical solution of the present invention to solve the above technical problems is: a device for rejecting defective small-format printed labels, comprising a paper feeding unit, a paper stacking detection unit, a bottom surface adsorption and conveying unit, a top surface adsorption and conveying unit and a good product collection unit arranged in sequence along the paper conveying direction, a top surface detection device is arranged above the bottom surface adsorption and conveying unit, and a bottom surface detection device is arranged below the top surface adsorption and conveying unit;

[0006] A defective product collection unit is arranged parallel to and directly below the good product collection unit, and a defective product adsorption and conveying unit is arranged below the top surface adsorption and conveying unit, which is located between the defective product collection unit and the bottom surface detection device and can convey defective paper downward to the defective product collection unit at an angle;

[0007] A paper press is horizontally arranged between the conveying surface of the top surface adsorption and conveying unit and the conveying surface of the defective product adsorption and conveying unit, a paper guide parallel to the conveying surface of the defective product adsorption and conveying unit is arranged on the paper output side of the paper press, and an air blowing nozzle capable of blowing the edge of the paper away from the conveying surface of the top surface adsorption and conveying unit is also arranged on the top surface adsorption and conveying unit, and an air outlet end of the air blowing nozzle is located on the paper input side of the paper press.

[0008] As a further improvement of the present invention, a downwardly inclined guide paper is provided between the air outlet end of the blowing nozzle and the conveying surface of the defective product adsorption and conveying unit, and the edge of the guide paper close to the press paper side extends between the press paper and the conveying surface of the defective product adsorption and conveying unit.

[0009] As a further improvement of the present invention, the edge of the paper pressing board close to the paper guide board is arranged to be tilted downward.

[0010] As a further improvement of the present invention, there are multiple paper guides, and the multiple paper guides are arranged in sequence along the conveying direction of the defective product adsorption and conveying unit.

[0011] As a further improvement of the present invention, the bottom surface adsorption conveying unit includes a bottom surface conveying belt which rotates along the paper conveying direction, and a bottom surface adsorption negative pressure box is provided below the top surface of the bottom surface conveying belt along its extension direction, and a plurality of suction holes are evenly distributed on the entire top surface of the bottom surface adsorption negative pressure box, and a plurality of adsorption holes are evenly distributed on the entire belt surface of the bottom surface conveying belt.

[0012] As a further improvement of the present invention, a plurality of bottom belt rollers for tensioning the bottom conveyor belt are provided on the inner ring side of the bottom conveyor belt, and the bottom adsorption conveying unit also includes a bottom belt motor, and the output end of the bottom belt motor is transmission-connected to at least one of the bottom belt rollers.

[0013] As a further improvement of the present invention, the top surface adsorption conveying unit includes a top surface conveying belt which rotates along the paper conveying direction, and a top surface adsorption negative pressure box is provided above the bottom surface of the top surface conveying belt along its extension direction, and a plurality of suction holes are evenly distributed on the entire bottom surface of the top surface adsorption negative pressure box, and a plurality of adsorption holes are evenly distributed on the entire belt surface of the top surface conveying belt.

[0014] As a further improvement of the present invention, a plurality of top surface belt rollers for tensioning the top surface conveyor belt are provided on the inner ring side of the top surface conveyor belt, and the top surface adsorption conveying unit also includes a top surface belt motor, and the output end of the top surface belt motor is transmission-connected to at least one of the top surface belt rollers.

[0015] As a further improvement of the present invention, the defective product adsorption and conveying unit includes a defective product conveying belt which rotates along the defective product paper conveying direction, and a defective product adsorption negative pressure box is provided below the inclined surface of the defective product conveying belt along its extension direction, and a plurality of suction holes are evenly distributed on the entire upper surface of the defective product adsorption negative pressure box, and a plurality of adsorption holes are evenly distributed on the entire belt surface of the defective product conveying belt.

[0016] As a further improvement of the present invention, a plurality of defective belt rollers for tensioning the defective product conveying belt are provided on the inner ring side of the defective product conveying belt, and the defective product adsorption and conveying unit also includes a defective belt motor, and the output end of the defective belt motor is transmission-connected to at least one of the defective belt rollers.

[0017] Beneficial Effects

[0018] Compared with the prior art, the advantages of the device for rejecting defective small-format printed labels of the present invention are:

[0019] 1. In the device, since the defective product collection unit is located directly below the good product collection unit, the defective product adsorption and conveying unit and the top surface adsorption and conveying unit have the same horizontal conveying direction; with the pressboard disposed between the conveying surface of the top surface adsorption and conveying unit and the air blowing nozzle disposed on the paper input side of the pressboard, when the top surface detection device and the bottom surface detection device detect paper defects, the air blowing nozzle can blow the edge of the defective paper away from the conveying surface of the top surface adsorption and conveying unit; thereafter, as the top surface adsorption and conveying unit continues to operate, the defective paper will gradually detach from the top surface adsorption and conveying unit under the blocking effect of the pressboard and the adsorption effect of the defective product adsorption and conveying unit, and will be adsorbed by the defective product adsorption and conveying unit and conveyed to the defective product collection unit;

[0020] In this process, each adsorption and conveying unit can remove defective paper without stopping, thereby avoiding adverse effects on the performance and stability of each adsorption and conveying unit, and at the same time improving the detection efficiency of the equipment.

[0021] 2. In this equipment, under the limiting effect of the paper guide and the adsorption and conveying effect of the defective adsorption and conveying unit, defective paper can be transported to the defective collection unit in a stable and orderly manner without falling at high speed, thus avoiding the problems of defective paper being damaged, stacked in a messy manner, and difficult to collect.

[0022] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A perspective view of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the cooperation between the bottom surface adsorption and conveying unit and the top surface adsorption and conveying unit of the present invention;

[0027] Figure 4 It is a schematic diagram of the cooperation between the top surface adsorption and conveying unit and the defective product adsorption and conveying unit of the present invention;

[0028] Figure 5 for Figure 4 A partial enlarged view of part A in the middle.

[0029] Among them: 1-paper feeding unit; 2-paper stacking detection unit; 3-bottom surface adsorption and conveying unit; 31-bottom surface conveying belt; 32-bottom surface belt roller; 33-bottom surface belt motor; 34-bottom surface adsorption negative pressure box; 4-top surface adsorption and conveying unit; 41-top surface conveying belt; 42-top surface belt roller; 43-top surface belt motor; 44-top surface adsorption negative pressure box; 45-blowing nozzle; 46-good product counting electric eye; 5-defective product adsorption and conveying unit; 51-defective product conveying belt; 52-defective product belt roller; 53-defective product belt motor; 54-defective product adsorption negative pressure box; 55-lead paper board; 56-pressing paper board; 57-guide paper board; 58-defective product counting electric eye; 6-good product collection unit; 7-defective product collection unit; 8-top surface detection device; 9-bottom surface detection device. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0033] Example:

[0034] The specific embodiments of the present invention are as follows Figure 1-5 As shown, a device for rejecting defective small-format printed labels comprises a paper feeding unit 1, a paper stacking detection unit 2, a bottom surface adsorption and conveying unit 3, a top surface adsorption and conveying unit 4, and a good product collection unit 6, which are sequentially arranged on a frame along the paper conveying direction. A top surface detection device 8 is provided on the frame above the bottom surface adsorption and conveying unit 3, and a bottom surface detection device 9 is provided on the frame below the top surface adsorption and conveying unit 4. In this embodiment, the top surface detection device 8 is two shooting cameras arranged sequentially along the paper conveying direction and facing downward, and the bottom surface detection device 9 is a shooting camera with a camera facing upward.

[0035] In order to collect defective paper, the device is provided with a defective collection unit 7 in parallel directly below the good collection unit 6. At the same time, a defective adsorption and conveying unit 5 is provided below the top surface adsorption and conveying unit 4, which is located between the defective collection unit 7 and the bottom surface detection device 9 and can convey the defective paper to the defective collection unit 7 in a downward tilt. In addition, in order to remove defective paper, a press paper 56 is horizontally provided between the conveying surface of the top surface adsorption and conveying unit 4 and the conveying surface of the defective adsorption and conveying unit 5. A guide paper 57 parallel to the conveying surface of the defective adsorption and conveying unit 5 is provided on the paper output side of the press paper 56. An air blowing nozzle 45 is provided on the top surface adsorption and conveying unit 4, which can blow the edge of the paper away from the conveying surface of the top surface adsorption and conveying unit 4, and the air outlet end of the air blowing nozzle 45 is located on the paper input side of the press paper 56. In addition, in order to count genuine paper and defective paper, a good product counting electric eye 46 is provided below the conveying surface of the top surface adsorption and conveying unit 4 between the air blowing nozzle 45 and the good product collection unit 6; and a defective product counting electric eye 58 is provided above the conveying surface of the defective product adsorption and conveying unit 5 between the paper guide 57 and the defective product collection unit 7.

[0036] In this embodiment, the paper feeding unit 1, the paper stacking detection unit 2, the good product collection unit 6 and the defective product collection unit 7 are all shelf products purchased from Tianjin Changrong Technology Group Co., Ltd. Specifically: the model of the paper feeding unit 1 is MKA103A-004C, which is mainly used for the supply of paper; the model of the paper stacking detection unit 2 is DBK+4 / EMPF / M12 / 3BEE / M18, which is mainly used to detect whether the supplied paper is overlapped; the models of the good product collection unit 6 and the defective product collection unit 7 are both MKD101A-003A, the former is mainly used to collect good product paper, and the latter is mainly used to collect defective paper. Since the paper feeding unit 1, the paper stacking detection unit 2, the good product collection unit 6 and the defective product collection unit 7 are all existing shelf products and belong to the prior art, their specific structures will not be described in detail here.

[0037] When the device is used, the staff or automatic production equipment first puts the stacks of printed paper into the paper feeding unit 1 to complete the preparation work. The device is powered on and started. First, the paper feeding unit 1 will convey the stacks of paper one by one to the paper stacking detection unit 2 through the conveyor belt, and the paper stacking detection unit 2 will detect the paper stacking; then, the paper stacking detection unit 2 conveys the paper to the bottom surface adsorption conveying unit 3. During the process of the bottom surface adsorption conveying unit 3 conveying the paper, the top surface detection device 8 will shoot and detect the top surface of the paper; then, the paper that has completed the top surface detection will be conveyed to the top surface adsorption conveying unit 4. During the process of the top surface adsorption conveying unit 4 conveying the paper, the bottom surface detection device 9 will shoot and detect the bottom surface of the paper, thereby completing the double-sided detection of the paper.

[0038] After completing the double-sided inspection, the good paper will be transported to the good collection unit 6 by the top surface adsorption and conveying unit 4. If defective paper is detected, the top surface detection device 8 and / or the bottom surface detection device 9 will send a signal to the air blowing nozzle 45. Since the distance between the air blowing nozzle 45 and the bottom surface detection device 9 is exactly the length of a sheet of paper, the air blowing nozzle 45 is activated at this time to just blow the edge of the defective paper that has completed the double-sided inspection away from the conveying surface of the top surface adsorption and conveying unit 4. Afterwards, with the continuous operation of the top surface adsorption and conveying unit 4, the defective paper will gradually detach from the top surface adsorption and conveying unit 4 under the blocking effect of the paperboard 56 and the adsorption effect of the defective adsorption and conveying unit 5, and will be adsorbed by the defective adsorption and conveying unit 5 and transported to the defective collection unit 7. In this way, the device can complete the removal of defective paper and complete the classified collection of good paper and defective paper.

[0039] In the device, since the defective product collection unit 7 is located directly below the good product collection unit 6, the defective product adsorption and conveying unit 5 has the same horizontal conveying direction as the top surface adsorption and conveying unit 4. In conjunction with the press paper 56 disposed between the conveying surface of the top surface adsorption and conveying unit 4 and the conveying surface of the defective product adsorption and conveying unit 5, and the air blowing nozzle 45 disposed on the paper input side of the press paper 56, when the top surface detection device 8 and the bottom surface detection device 9 detect paper defects, the air blowing nozzle 45 can blow the edge of the defective paper away from the conveying surface of the top surface adsorption and conveying unit 4, and as the top surface adsorption and conveying unit 4 continues to operate, the defective paper will gradually detach from the top surface adsorption and conveying unit 4, be adsorbed by the defective product adsorption and conveying unit 5, and be conveyed to the defective product collection unit 7.

[0040] In this process, each adsorption and conveying unit can remove defective paper without stopping, thereby avoiding adverse effects on the performance and stability of each adsorption and conveying unit, and improving the detection efficiency of the device. Moreover, in the device, under the limiting effect of the paper guide 57 and the adsorption and conveying effect of the defective adsorption and conveying unit 5, defective paper can be stably and orderly conveyed to the defective collection unit 7 without falling at high speed, thus avoiding the problems of defective paper being damaged, stacked in a disorderly manner, and difficult to collect.

[0041] In this device, Figure 5 As shown, a downwardly inclined guide paper 55 is provided between the air outlet of the air blowing nozzle 45 and the conveying surface of the defective adsorption and conveying unit 5, and the edge of the guide paper 55 close to the press paper 56 extends to between the press paper 56 and the conveying surface of the defective adsorption and conveying unit 5. Through the flow-guiding effect of the guide paper 55, the gas ejected from the air blowing nozzle 45 can flow toward between the press paper 56 and the conveying surface of the defective adsorption and conveying unit 5. Therefore, by using the guide paper 55 in conjunction with the air blowing nozzle 45, the edge of the defective paper can be introduced into between the press paper 56 and the conveying surface of the defective adsorption and conveying unit 5 in an inclined shape after being blown away from the conveying surface of the top surface adsorption and conveying unit 4, thereby avoiding the defective paper from rolling up between the air outlet of the air blowing nozzle 45 and the conveying surface of the defective adsorption and conveying unit 5, thereby ensuring the smooth removal of defective paper.

[0042] At the same time, since the conveying surface of the top surface adsorption conveying unit 4 is close to the input end of the defective product adsorption conveying unit 5, the paper pressing paper 56 in the device not only has the function of blocking defective paper and separating it from the top surface adsorption conveying unit 4, but also can isolate the top surface adsorption conveying unit 4 from adsorbing and interfering with the defective paper on the defective product adsorption conveying unit 5. Moreover, in order to keep the defective paper on the defective product adsorption conveying unit 5 flat, the edge of the paper pressing paper 56 close to the paper guide 57 is tilted downward.

[0043] In this embodiment, there are multiple paper guides 57, and the multiple paper guides 57 are arranged in sequence along the conveying direction of the defective adsorption and conveying unit 5. The paper guides 57 can not only limit the defective paper on the defective adsorption and conveying unit 5, but also have the function of partially isolating the top surface adsorption and conveying unit 4 from adsorbing and interfering with the defective paper on the defective adsorption and conveying unit 5.

[0044] In the device, how the bottom surface adsorption conveying unit 3 realizes the adsorption of paper is as follows: the bottom surface adsorption conveying unit 3 includes a bottom surface conveying belt 31 that rotates along the paper conveying direction. A bottom surface adsorption negative pressure box 34 arranged along its extension direction is provided below the top surface of the bottom surface conveying belt 31, and a plurality of suction holes are evenly distributed on the entire top surface of the bottom surface adsorption negative pressure box 34. A plurality of adsorption holes are evenly distributed on the entire belt surface of the bottom surface conveying belt 31. In this embodiment, the bottom surface adsorption negative pressure box 34 is a closed box body with suction holes only on the top surface, and the entire top surface of the bottom surface adsorption negative pressure box 34 covers the entire adsorption surface of the bottom surface conveying belt 31. By connecting the suction pipe connected to the inner cavity thereof, the inside of the bottom surface adsorption negative pressure box 34 is kept at a negative pressure. When the inside of the bottom surface adsorption negative pressure box 34 is in a negative pressure state, the paper can be adsorbed on the belt surface of the bottom surface conveying belt 31 through the suction holes cooperating with the adsorption holes on the belt surface of the bottom surface conveying belt 31, thereby realizing the adsorption of the paper.

[0045] In order to realize the rotational motion of the bottom conveying belt 31, the bottom adsorption conveying unit 3 is also provided with a plurality of bottom belt rollers 32 for tensioning the bottom conveying belt 31 on the inner ring side of the bottom conveying belt 31. At the same time, the bottom adsorption conveying unit 3 also includes a bottom belt motor 33, and the output end of the bottom belt motor 33 is transmission-connected with at least one of the bottom belt rollers 32. The bottom belt motor 33 can drive the bottom belt rollers 32, thereby driving the rotational motion of the bottom conveying belt 31, thereby realizing the conveyance of paper.

[0046] In this device, how the top surface adsorption conveying unit 4 realizes the adsorption of paper is as follows: the top surface adsorption conveying unit 4 includes a top surface conveying belt 41 that rotates along the paper conveying direction. Two top surface adsorption negative pressure boxes 44 are arranged in sequence along the extension direction above the bottom surface of the top surface conveying belt 41, and a plurality of suction holes are evenly distributed on the entire bottom surface of the top surface adsorption negative pressure box 44. A plurality of adsorption holes are evenly distributed on the entire belt surface of the top surface conveying belt 41. In this embodiment, the suction nozzle 45 is arranged between the two top surface adsorption negative pressure boxes 44. The top surface adsorption negative pressure box 44 is a closed box body with suction holes only on the bottom surface, and the bottom surfaces of the two top surface adsorption negative pressure boxes 44 cover the entire adsorption surface of the top surface conveying belt 41. By connecting a suction pipe connected to its inner cavity, the inside of the top surface adsorption negative pressure box 44 is kept at a negative pressure. When the inside of the top surface adsorption negative pressure box 44 is in a negative pressure state, the paper can be adsorbed on the belt surface of the top surface conveying belt 41 through the suction holes cooperating with the adsorption holes on the belt surface of the top surface conveying belt 41, thereby achieving adsorption of the paper.

[0047] In order to realize the rotational motion of the top conveying belt 41, the top adsorption conveying unit 4 is also provided with a plurality of top belt rollers 42 for tensioning the top conveying belt 41 on the inner ring side of the top conveying belt 41. At the same time, the top adsorption conveying unit 4 also includes a top belt motor 43, and the output end of the top belt motor 43 is transmission-connected with at least one of the top belt rollers 42. The top belt motor 43 can drive the top belt roller 42, thereby driving the rotational motion of the top conveying belt 41, thereby realizing the conveying of paper.

[0048] In this device, how the defective adsorption and conveying unit 5 realizes the adsorption of defective paper is as follows: the defective adsorption and conveying unit 5 includes a defective conveying belt 51 that rotates along the defective paper conveying direction. A plurality of defective adsorption negative pressure boxes 54 are arranged in sequence along the extension direction below the inclined surface of the defective conveying belt 51, and a plurality of suction holes are evenly distributed on the entire upper surface of the defective adsorption negative pressure box 54. A plurality of adsorption holes are evenly distributed on the entire belt surface of the defective conveying belt 51. In this embodiment, the defective adsorption negative pressure box 54 is a closed box body with suction holes only on the upper surface, and the upper surfaces of the plurality of defective adsorption negative pressure boxes 54 cover the entire adsorption surface of the defective conveying belt 51. Negative pressure is maintained inside the defective adsorption negative pressure box 54 by connecting a suction pipe connected to its inner cavity. When the interior of the defective product adsorption negative pressure box 54 is in a negative pressure state, the defective paper can be adsorbed on the belt surface of the defective product conveying belt 51 through the suction holes cooperating with the adsorption holes on the belt surface of the defective product conveying belt 51, thereby achieving adsorption of the defective paper.

[0049] In order to realize the rotational motion of the defective conveying belt 41, the defective adsorption conveying unit 5 is also provided with a plurality of defective belt rollers 52 for tensioning the defective conveying belt 51 on the inner ring side of the defective conveying belt 51. At the same time, the defective adsorption conveying unit 5 also includes a defective belt motor 53, and the output end of the defective belt motor 53 is transmission-connected with at least one of the defective belt rollers 52. The defective belt motor 53 can drive the defective belt rollers 52, thereby driving the rotational motion of the defective conveying belt 51, and then realizing the conveyance of defective paper.

[0050] The present invention is described above in conjunction with the best embodiment, but the present invention is not limited to the above disclosed embodiment, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A device for removing defective small-format printed labels, characterized in that: The invention comprises a paper feeding unit (1), a paper stacking detection unit (2), a bottom surface adsorption conveying unit (3), a top surface adsorption conveying unit (4) and a good product collection unit (6) which are sequentially arranged along the paper conveying direction, wherein a top surface detection device (8) is arranged above the bottom surface adsorption conveying unit (3), and a bottom surface detection device (9) is arranged below the top surface adsorption conveying unit (4); A defective product collection unit (7) is provided directly below the good product collection unit (6) and in parallel thereto, and a defective product adsorption and transportation unit (5) is provided below the top surface adsorption and transportation unit (4) and is located between the defective product collection unit (7) and the bottom surface detection device (9) and is capable of transporting defective paper sheets downwardly to the defective product collection unit (7); A paper pressing paper (56) is horizontally arranged between the conveying surface of the top surface adsorption conveying unit (4) and the conveying surface of the defective product adsorption conveying unit (5); a paper guide paper (57) parallel to the conveying surface of the defective product adsorption conveying unit (5) is arranged on the paper output side of the paper pressing paper (56); an air blowing nozzle (45) capable of blowing the edge of the paper away from the conveying surface of the top surface adsorption conveying unit (4) is also arranged on the top surface adsorption conveying unit (4); and an air outlet end of the air blowing nozzle (45) is located on the paper input side of the paper pressing paper (56).

2. The device for removing defective small-format printed labels according to claim 1 is characterized in that: A downwardly inclined guide paper (55) is provided between the air outlet end of the air blowing nozzle (45) and the conveying surface of the defective product adsorption and conveying unit (5), and an edge of the guide paper (55) close to the press paper (56) extends between the press paper (56) and the conveying surface of the defective product adsorption and conveying unit (5).

3. The device for removing defective small-format printed labels according to claim 1 or 2, characterized in that: The edge of the paper pressing plate (56) close to the paper guiding plate (57) is arranged to be tilted downward.

4. The device for removing defective small-format printed labels according to claim 1 is characterized in that: There are a plurality of paper guides (57), and the plurality of paper guides (57) are arranged in sequence along the conveying direction of the defective product adsorption conveying unit (5).

5. The device for removing defective small-format printed labels according to claim 1 is characterized in that: The bottom surface adsorption conveying unit (3) comprises a bottom surface conveying belt (31) which rotates along the paper conveying direction, a bottom surface adsorption negative pressure box (34) arranged along its extension direction is provided below the top surface of the bottom surface conveying belt (31), and a plurality of suction holes are evenly distributed on the entire top surface of the bottom surface adsorption negative pressure box (34), and a plurality of adsorption holes are evenly distributed on the entire belt surface of the bottom surface conveying belt (31).

6. The device for removing defective small-format printed labels according to claim 5, characterized in that: A plurality of bottom belt rollers (32) for tensioning the bottom conveying belt (31) are provided on the inner ring side of the bottom conveying belt (31); the bottom adsorption conveying unit (3) further comprises a bottom belt motor (33); and the output end of the bottom belt motor (33) is transmission-connected to at least one of the bottom belt rollers (32).

7. The device for removing defective small-format printed labels according to claim 1, characterized in that: The top surface adsorption conveying unit (4) comprises a top surface conveying belt (41) which rotates along the paper conveying direction, a top surface adsorption negative pressure box (44) is provided above the bottom surface of the top surface conveying belt (41) and arranged along its extension direction, and a plurality of suction holes are evenly distributed on the entire bottom surface of the top surface adsorption negative pressure box (44), and a plurality of adsorption holes are evenly distributed on the entire belt surface of the top surface conveying belt (41).

8. The device for removing defective small-format printed labels according to claim 7, characterized in that: A plurality of top surface belt rollers (42) for tensioning the top surface conveying belt (41) are provided on the inner ring side of the top surface conveying belt (41); the top surface adsorption conveying unit (4) further comprises a top surface belt motor (43); and the output end of the top surface belt motor (43) is transmission-connected to at least one of the top surface belt rollers (42).

9. The device for removing defective small-format printed labels according to claim 1, characterized in that: The defective product adsorption conveying unit (5) comprises a defective product conveying belt (51) which rotates along the defective product paper conveying direction, a defective product adsorption negative pressure box (54) is arranged along its extension direction below the inclined surface of the defective product conveying belt (51), and a plurality of suction holes are evenly distributed on the entire upper surface of the defective product adsorption negative pressure box (54), and a plurality of adsorption holes are evenly distributed on the entire belt surface of the defective product conveying belt (51).

10. The device for removing defective small-format printed labels according to claim 9, characterized in that: The inner ring side of the defective product conveying belt (51) is provided with a plurality of defective product belt rollers (52) for tensioning the defective product conveying belt (51), and the defective product adsorption conveying unit (5) also includes a defective product belt motor (53), and the output end of the defective product belt motor (53) is transmission-connected to at least one of the defective product belt rollers (52).

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