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

Abstract

The utility model discloses rejecting equipment for inferior-quality products of small-breadth printed labels, relates to the technical field of printed matter detection, and is mainly used for solving the problem that a conveying mechanism of the 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, adverse effects on the performance and stability of all the adsorption conveying units are avoided, and meanwhile the detection efficiency of the equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of printed matter inspection technology, and in particular to a device for rejecting defective small-format printed labels. Background Technology

[0002] In the production of packaging boxes such as cigarette boxes and wine boxes, different label patterns need to be printed on small sheets of paper according to the needs of the product or customer. If a printing error occurs on these small sheets of paper, the printed product must be scrapped. Therefore, in actual production, the printed small sheets of paper often need to be inspected by testing equipment, and defective paper is rejected.

[0003] However, existing inspection equipment primarily uses mechanical pushing to directly move defective paper into a defective tray on one side of the conveyor line. This necessitates a temporary pause in the conveyor mechanism during defective paper rejection, followed by a restart after rejection—frequent start / stop operations not only impact the performance and stability of the conveyor mechanism but also reduce inspection efficiency. Furthermore, due to the lack of guidance—rejected defective paper falls directly into the tray at high speed—it is prone to damage during this high-speed descent, and the rejected paper in the tray also suffers from disorganized stacking and difficulty in collection. Utility Model Content

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

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is: a small-format printed label defective product rejection device, including a paper feeding unit, a paper stacking detection unit, a bottom surface adsorption conveying unit, a top surface adsorption conveying unit and a good product collection unit arranged sequentially along the paper conveying direction. A top surface detection device is provided above the bottom surface adsorption conveying unit and a bottom surface detection device is provided below the top surface adsorption conveying unit.

[0006] The defective product collection unit is arranged parallel to the good product collection unit directly below it. The defective product adsorption and conveying unit is located between the defective product collection unit and the bottom detection device below the top adsorption and conveying unit, and can tilt and convey defective paper downwards to the defective product collection unit.

[0007] A pressure plate is horizontally provided between the conveying surface of the top adsorption conveying unit and the conveying surface of the defective product adsorption conveying unit. A guide plate parallel to the conveying surface of the defective product adsorption conveying unit is provided on the paper output side of the pressure plate. The top adsorption conveying unit is also provided with an air blowing nozzle that can blow the edge of the paper away from the conveying surface of the top adsorption conveying unit, and the air outlet end of the air blowing nozzle is located on the paper input side of the pressure plate.

[0008] A good product counting photoelectric sensor is provided below the conveying surface of the top adsorption conveying unit between the air blowing nozzle and the good product collection unit; a defective product counting photoelectric sensor is provided above the conveying surface of the defective adsorption conveying unit between the guide plate and the defective product collection unit.

[0009] As a further improvement of this utility model, a downwardly inclined guide plate 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 plate near the pressure plate extends to the space between the pressure plate and the conveying surface of the defective product adsorption and conveying unit.

[0010] As a further improvement of this utility model, the edge of the pressure plate near the guide plate is inclined downward.

[0011] As a further improvement of this utility model, there are multiple guide plates, and the multiple guide plates are arranged sequentially along the conveying direction of the defective product adsorption and conveying unit.

[0012] As a further improvement of this utility model, the bottom surface adsorption conveying unit includes a bottom surface conveying belt that rotates along the paper conveying direction. A bottom surface adsorption negative pressure box is provided below the top surface of the bottom surface conveying belt and arranged along its extension direction. Multiple air suction holes are evenly distributed on the entire top surface of the bottom surface adsorption negative pressure box, and multiple adsorption holes are evenly distributed on the entire belt surface of the bottom surface conveying belt.

[0013] As a further improvement of this utility model, the inner ring side of the bottom conveyor belt is provided with multiple bottom belt rollers for tensioning 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 drivenly connected to at least one of the bottom belt rollers.

[0014] As a further improvement of this utility model, the top surface adsorption conveying unit includes a top surface conveying belt that rotates along the paper conveying direction. A top surface adsorption negative pressure box is provided above the bottom surface of the top surface conveying belt and arranged along its extension direction. Multiple air suction holes are evenly distributed on the entire bottom surface of the top surface adsorption negative pressure box, and multiple adsorption holes are evenly distributed on the entire belt surface of the top surface conveying belt.

[0015] As a further improvement of this utility model, the inner ring side of the top surface conveyor belt is provided with multiple top surface belt rollers for tensioning 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 drivenly connected to at least one of the top surface belt rollers.

[0016] As a further improvement of this utility model, the defective product adsorption and conveying unit includes a defective product conveying belt that rotates along the direction of conveying defective paper. A defective product adsorption negative pressure box is provided below the inclined surface of the defective product conveying belt and arranged along its extension direction. Multiple suction holes are evenly distributed on the entire upper surface of the defective product adsorption negative pressure box, and multiple adsorption holes are evenly distributed on the entire belt surface of the defective product conveying belt.

[0017] As a further improvement of this utility model, the inner ring side of the defective conveyor belt is provided with multiple defective belt rollers for tensioning the defective conveyor belt, and the defective adsorption and conveying unit also includes a defective belt motor, and the output end of the defective belt motor is drivenly connected to at least one of the defective belt rollers.

[0018] Beneficial effects

[0019] Compared with the prior art, the advantages of the small-format printed label rejection device of this utility model are:

[0020] In this 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 adsorption and conveying unit have the same horizontal conveying direction. With the help of the pressure plate set between the conveying surface of the top adsorption and conveying unit and the conveying surface of the defective product adsorption and conveying unit, and the air nozzle set on the paper input side of the pressure plate, when the top surface detection device and the bottom surface detection device detect paper defects, the air nozzle can blow the edge of the defective paper away from the conveying surface of the top adsorption and conveying unit. Then, as the top adsorption and conveying unit continues to operate, the defective paper will gradually detach from the top adsorption and conveying unit under the blocking action of the pressure plate and the adsorption action of the defective product adsorption and conveying unit, and will be adsorbed by the defective product adsorption and conveying unit and transported to the defective product collection unit.

[0021] In this process, each adsorption and conveying unit can remove defective paper without interruption, thus avoiding adverse effects on the performance and stability of each adsorption and conveying unit, while also improving the detection efficiency of the equipment.

[0022] In this device, under the limiting effect of the guide plate and the adsorption and conveying effect of the defective paper adsorption and conveying unit, defective paper can be stably and orderly conveyed to the defective paper collection unit without falling at high speed. This also avoids problems such as damage to defective paper, messy stacking, and difficulty in collection.

[0023] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a perspective view of the present utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0027] Figure 3 This is a schematic diagram showing the cooperation between the bottom adsorption and conveying unit and the top adsorption and conveying unit of this utility model;

[0028] Figure 4 This is a schematic diagram showing the cooperation between the top surface adsorption conveying unit and the defective product adsorption conveying unit of this utility model;

[0029] Figure 5 for Figure 4 A magnified view of part A in the middle.

[0030] Wherein: 1-Paper feeding unit; 2-Paper stacking detection unit; 3-Bottom surface adsorption conveying unit; 31-Bottom surface conveyor belt; 32-Bottom surface belt roller; 33-Bottom surface belt motor; 34-Bottom surface adsorption negative pressure box; 4-Top surface adsorption conveying unit; 41-Top surface conveyor 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 photoelectric sensor; 5-Defective product adsorption conveying unit; 51-Defective product conveyor belt; 52-Defective product belt roller; 53-Defective product belt motor; 54-Defective product adsorption negative pressure box; 55-Guideboard; 56-Pressing board; 57-Guideboard; 58-Defective product counting photoelectric sensor; 6-Good product collection unit; 7-Defective product collection unit; 8-Top surface detection device; 9-Bottom surface detection device. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0034] Example

[0035] The specific embodiments of this utility model are as follows: Figure 1-5 As shown, a rejection device for defective small-format printed labels includes 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, all arranged sequentially along the paper conveying direction on a frame. A top surface detection device 8 is mounted on the frame above the bottom surface adsorption conveying unit 3, and a bottom surface detection device 9 is mounted on the frame below the top surface adsorption conveying unit 4. In this embodiment, the top surface detection device 8 consists of two cameras arranged sequentially along the paper conveying direction with their cameras facing downwards, while the bottom surface detection device 9 consists of one camera with its camera facing upwards.

[0036] To collect defective paper, the device has a defective paper collection unit 7 positioned parallel to the good paper collection unit 6 directly below it. Simultaneously, a defective paper adsorption and conveying unit 5 is located below the top adsorption and conveying unit 4, between the defective paper collection unit 7 and the bottom detection device 9, and is designed to tilt and convey defective paper downwards to the defective paper collection unit 7. Furthermore, to remove defective paper, a pressure plate 56 is horizontally positioned between the conveying surfaces of the top adsorption and conveying unit 4 and the defective paper adsorption and conveying unit 5. A guide plate 57, parallel to the conveying surface of the defective paper adsorption and conveying unit 5, is located on the paper output side of the pressure plate 56. The top adsorption and conveying unit 4 has an air nozzle 45 that blows the edges of the paper away from its conveying surface, with the air outlet of the air nozzle 45 located on the paper input side of the pressure plate 56. In addition, in order to count the good and defective paper, a good counting photoelectric eye 46 is provided below the conveying surface of the top adsorption conveying unit 4 between the air blowing nozzle 45 and the good paper collection unit 6; and a defective counting photoelectric eye 58 is provided above the conveying surface of the defective adsorption conveying unit 5 between the guide plate 57 and the defective paper collection unit 7.

[0037] In this embodiment, the paper feeding unit 1, the paper stacking detection unit 2, the good paper collection unit 6, and the defective paper collection unit 7 are all shelving products purchased from Tianjin Changrong Technology Group Co., Ltd. Specifically: the paper feeding unit 1 is model MKA103A-004C, mainly used for paper supply; the paper stacking detection unit 2 is model DBK+4 / EMPF / M12 / 3BEE / M18, mainly used for detecting whether the supplied paper overlaps; the good paper collection unit 6 and the defective paper collection unit 7 are both model MKD101A-003A, the former mainly used for collecting good paper, and the latter mainly used for collecting defective paper. Since the paper feeding unit 1, the paper stacking detection unit 2, the good paper collection unit 6, and the defective paper collection unit 7 are all existing shelving products and belong to prior art, their specific structures will not be described in detail here.

[0038] When using this equipment, workers or automated production equipment first place stacks of printed paper into the paper feeding unit 1 to complete the preparation work. Once the equipment is powered on and started, the paper feeding unit 1 first uses a conveyor belt to transport the stacks of paper individually to the paper stacking detection unit 2, where the paper stacking detection unit 2 performs stacking detection. Then, the paper stacking detection unit 2 transports the paper to the bottom surface adsorption conveying unit 3. During this process, the top surface detection device 8 photographs and detects the top surface of the paper. Afterward, the paper that has completed top surface detection is transported to the top surface adsorption conveying unit 4. During this process, the bottom surface detection device 9 photographs and detects the bottom surface of the paper, thus completing the double-sided detection of the paper.

[0039] After double-sided inspection, the good quality paper is conveyed to the good quality collection unit 6 by the top surface adsorption conveying unit 4. If a 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 nozzle 45. Since the distance between the air nozzle 45 and the bottom surface detection device 9 is exactly the length of a sheet of paper, the air nozzle 45 can blow the edge of the defective paper that has completed double-sided inspection away from the conveying surface of the top surface adsorption conveying unit 4. Subsequently, as the top surface adsorption conveying unit 4 continues to operate, the defective paper will gradually detach from the top surface adsorption conveying unit 4 under the obstruction of the pressure plate 56 and the adsorption of the defective adsorption conveying unit 5, and will be adsorbed by the defective adsorption conveying unit 5 and conveyed to the defective collection unit 7. Thus, the device can complete the rejection of defective paper and the classification and collection of good and defective paper.

[0040] In this 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 and the top adsorption and conveying unit 4 have the same horizontal conveying direction. With the pressure plate 56 positioned between the conveying surfaces of the top adsorption and conveying unit 4 and the defective product adsorption and conveying unit 5, and the air nozzle 45 positioned on the paper input side of the pressure plate 56, when the top surface detection device 8 and the bottom surface detection device 9 detect paper defects, the air nozzle 45 can blow the edge of the defective paper away from the conveying surface of the top adsorption and conveying unit 4. As the top adsorption and conveying unit 4 continues to operate, the defective paper will gradually detach from the top adsorption and conveying unit 4, be adsorbed by the defective product adsorption and conveying unit 5, and conveyed to the defective product collection unit 7.

[0041] In this process, each adsorption and conveying unit can remove defective paper without interruption, thus avoiding adverse effects on the performance and stability of each adsorption and conveying unit, and improving the detection efficiency of the equipment. Furthermore, under the limiting effect of the guide plate 57 and the adsorption and conveying effect of the defective paper adsorption and conveying unit 5, the defective paper can be stably and orderly conveyed to the defective paper collection unit 7, without high-speed falling, thus avoiding problems such as damage, messy stacking, and difficulty in collection of defective paper.

[0042] In this device, such as Figure 5 As shown, a downwardly inclined guide plate 55 is provided between the air outlet of the air nozzle 45 and the conveying surface of the defective product adsorption and conveying unit 5, and the edge of the guide plate 55 near the pressure plate 56 extends between the pressure plate 56 and the conveying surface of the defective product adsorption and conveying unit 5. Through the guiding effect of the guide plate 55, the gas ejected from the air nozzle 45 flows towards the space between the pressure plate 56 and the conveying surface of the defective product adsorption and conveying unit 5. Therefore, by using the guide plate 55 in conjunction with the air nozzle 45, the edge of the defective paper, after being blown away from the top surface of the adsorption and conveying unit 4, is inclinedly guided into the space between the pressure plate 56 and the conveying surface of the defective product adsorption and conveying unit 5, thereby preventing the defective paper from curling between the air outlet of the air nozzle 45 and the conveying surface of the defective product adsorption and conveying unit 5, and ensuring the smooth operation of the defective paper rejection process.

[0043] Meanwhile, because the conveying surface of the top adsorption conveying unit 4 is close to the input end of the defective adsorption conveying unit 5, the pressure plate 56 in this device not only blocks defective paper and separates it from the top adsorption conveying unit 4, but also isolates the top adsorption conveying unit 4 from the adsorption interference of the defective paper on the defective adsorption conveying unit 5. Furthermore, to keep the defective paper on the defective adsorption conveying unit 5 flat, the edge of the pressure plate 56 near the guide plate 57 is tilted downwards.

[0044] In this embodiment, there are multiple guide paper sheets 57, and these multiple guide paper sheets 57 are arranged sequentially along the conveying direction of the defective product adsorption and conveying unit 5. The guide paper sheets 57 not only limit the defective paper on the defective product adsorption and conveying unit 5, but also partially isolate the top surface adsorption and conveying unit 4 from adsorption interference on the defective paper on the defective product adsorption and conveying unit 5.

[0045] In this device, regarding how the bottom surface adsorption conveying unit 3 achieves paper adsorption, specifically: the bottom surface adsorption conveying unit 3 includes a bottom surface conveyor belt 31 that rotates along the paper conveying direction. A bottom surface adsorption negative pressure box 34 is provided below the top surface of the bottom surface conveyor belt 31, arranged along its extension direction, and multiple suction holes are evenly distributed on the entire top surface of the bottom surface adsorption negative pressure box 34. Multiple adsorption holes are evenly distributed on the entire belt surface of the bottom surface conveyor belt 31. In this embodiment, the bottom surface adsorption negative pressure box 34 is a closed box with air suction holes only on its 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 conveyor belt 31. By connecting an air suction pipe communicating with its inner cavity, the inside of the bottom surface adsorption negative pressure box 34 is kept under negative pressure. When the inside of the bottom surface adsorption negative pressure box 34 is under negative pressure, the paper can be adsorbed onto the belt surface of the bottom surface conveyor belt 31 through the air suction holes in conjunction with the adsorption holes on the belt surface of the bottom surface conveyor belt 31, thereby achieving paper adsorption.

[0046] To achieve the rotational movement of the bottom conveyor belt 31, the bottom suction conveying unit 3 also has multiple bottom belt rollers 32 for tensioning the bottom conveyor belt 31 on the inner ring side. Simultaneously, the bottom suction conveying unit 3 also includes a bottom belt motor 33, and the output end of the bottom belt motor 33 is connected to at least one of the bottom belt rollers 32. The bottom belt motor 33 drives the bottom belt rollers 32, thereby driving the rotational movement of the bottom conveyor belt 31, and thus realizing the conveying of paper.

[0047] In this device, regarding how the top surface adsorption conveying unit 4 achieves paper adsorption, specifically: the top surface adsorption conveying unit 4 includes a top surface conveyor belt 41 that rotates along the paper conveying direction. Two top surface adsorption negative pressure boxes 44 are arranged sequentially along their extension direction above the bottom surface of the top surface conveyor belt 41, and multiple suction holes are evenly distributed across the entire bottom surface of the top surface adsorption negative pressure box 44. Multiple adsorption holes are evenly distributed across the entire belt surface of the top surface conveyor belt 41. In this embodiment, a suction nozzle 45 is disposed between the two top surface adsorption negative pressure boxes 44. The top surface adsorption negative pressure box 44 is a closed box with suction holes only on its bottom surface, and the combined bottom surfaces of the two top surface adsorption negative pressure boxes 44 cover the entire adsorption surface of the top surface conveyor belt 41. A negative pressure is maintained inside the top surface adsorption negative pressure box 44 by connecting a suction pipe that communicates with its internal cavity. When the top surface adsorption negative pressure box 44 is in a negative pressure state, the paper can be adsorbed onto the surface of the top surface conveyor belt 41 by means of the air suction hole and the adsorption hole on the belt surface of the top surface conveyor belt 41, thereby achieving the adsorption of the paper.

[0048] To achieve the rotational movement of the top conveyor belt 41, the top surface adsorption conveying unit 4 also has multiple top surface belt rollers 42 for tensioning the top surface conveyor belt 41 on the inner ring side. Simultaneously, the top surface adsorption conveying unit 4 also includes a top surface belt motor 43, and the output end of the top surface belt motor 43 is connected to at least one of the top surface belt rollers 42. The top surface belt motor 43 drives the top surface belt rollers 42, thereby driving the rotational movement of the top surface conveyor belt 41, and thus realizing the conveying of paper.

[0049] In this device, regarding how the defective paper adsorption and conveying unit 5 adsorbs defective paper, specifically: the defective paper adsorption and conveying unit 5 includes a defective paper conveyor belt 51 that rotates along the conveying direction of the defective paper. Below the inclined surface of the defective paper conveyor belt 51, multiple defective paper adsorption negative pressure boxes 54 are arranged sequentially along its extension direction, and multiple suction holes are evenly distributed on the entire upper surface of the defective paper adsorption negative pressure box 54. Multiple adsorption holes are evenly distributed on the entire belt surface of the defective paper conveyor belt 51. In this embodiment, the defective paper adsorption negative pressure box 54 is a closed box with suction holes only on its upper surface, and the combined upper surfaces of multiple defective paper adsorption negative pressure boxes 54 cover the entire adsorption surface of the defective paper conveyor belt 51. A negative pressure is maintained inside the defective paper adsorption negative pressure box 54 by connecting a suction pipe that communicates with its inner cavity. When the defective paper is under negative pressure inside the defective paper adsorption negative pressure box 54, the defective paper can be adsorbed onto the surface of the defective paper conveyor belt 51 by means of the suction hole and the adsorption hole on the belt surface of the defective paper conveyor belt 51, thereby achieving the adsorption of defective paper.

[0050] To achieve the rotational movement of the defective conveyor belt 41, the defective product adsorption and conveying unit 5 also has multiple defective belt rollers 52 on the inner ring side of the defective conveyor belt 51 for tensioning the defective conveyor belt 51. Simultaneously, the defective product adsorption and conveying unit 5 also includes a defective belt motor 53, and the output end of the defective belt motor 53 is connected to at least one of the defective belt rollers 52. The defective belt motor 53 drives the defective belt rollers 52, thereby driving the rotational movement of the defective conveyor belt 51, and thus realizing the conveying of defective paper.

[0051] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A device for rejecting defective small-format printed labels, characterized in that, It includes 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) arranged sequentially along the paper conveying direction. A top surface detection device (8) is provided above the bottom surface adsorption conveying unit (3), and a bottom surface detection device (9) is provided below the top surface adsorption conveying unit (4). The good product collection unit (6) is provided in parallel below the defective product collection unit (7). The top surface adsorption and conveying unit (4) is provided below the defective product collection unit (7) and the bottom surface detection device (9), and the defective product adsorption and conveying unit (5) is located between the defective product collection unit (7) and the bottom surface detection device (9), and can tilt the defective paper downwards and convey it to the defective product collection unit (7). A pressure plate (56) is horizontally provided 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 guide plate (57) parallel to the conveying surface of the defective product adsorption conveying unit (5) is provided on the paper output side of the pressure plate (56). The top surface adsorption conveying unit (4) is also provided with an air blowing nozzle (45) that can blow the edge of the paper away from the conveying surface of the top surface adsorption conveying unit (4), and the air outlet of the air blowing nozzle (45) is located on the paper input side of the pressure plate (56). The good product counting photoelectric sensor (46) is provided below the conveying surface of the top surface adsorption conveying unit (4) between the air blowing nozzle (45) and the good product collection unit (6); the defective product counting photoelectric sensor (58) is provided above the conveying surface of the defective product adsorption conveying unit (5) between the guide plate (57) and the defective product collection unit (7).

2. The rejecting equipment for small-format printed labels according to claim 1, characterized in that, A downwardly inclined guide plate (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 the edge of the guide plate (55) near the pressure plate (56) extends to the space between the pressure plate (56) and the conveying surface of the defective product adsorption and conveying unit (5).

3. The rejecting equipment for small-format printed labels according to claim 1 or 2, characterized in that, The pressure plate (56) is inclined downward on the edge near the guide plate (57).

4. The rejecting equipment for small-format printed labels according to claim 1, characterized in that, There are multiple guide plates (57), and the multiple guide plates (57) are arranged sequentially along the conveying direction of the defective product adsorption and conveying unit (5).

5. The rejecting equipment for small-format printed labels according to claim 1, characterized in that, The bottom surface adsorption conveying unit (3) includes a bottom surface conveying belt (31) that rotates along the paper conveying direction. The bottom surface conveying belt (31) has a bottom surface adsorption negative pressure box (34) arranged along its extension direction below the top surface. The bottom surface adsorption negative pressure box (34) has multiple suction holes evenly distributed on the entire top surface. The bottom surface conveying belt (31) has multiple adsorption holes evenly distributed on the entire belt surface.

6. The rejecting equipment for small-format printed labels according to claim 5, characterized in that, The bottom conveyor belt (31) has multiple bottom belt rollers (32) on its inner ring side for tensioning the bottom conveyor belt (31). The bottom adsorption conveying unit (3) also includes a bottom belt motor (33), and the output end of the bottom belt motor (33) is connected to at least one of the bottom belt rollers (32).

7. The rejecting equipment for small-format printed labels according to claim 1, characterized in that, The top surface adsorption conveying unit (4) includes a top surface conveying belt (41) that 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. Multiple air suction holes are evenly distributed on the entire bottom surface of the top surface adsorption negative pressure box (44), and multiple adsorption holes are evenly distributed on the entire belt surface of the top surface conveying belt (41).

8. The rejecting equipment for small-format printed labels according to claim 7, characterized in that, The inner ring side of the top surface conveyor belt (41) is provided with multiple top surface belt rollers (42) for tensioning the top surface conveyor belt (41). The top surface adsorption conveying unit (4) also includes a top surface belt motor (43), and the output end of the top surface belt motor (43) is connected to at least one of the top surface belt rollers (42).

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

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

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