Automatic defect marking device in book and periodical printing process

Abstract

The invention relates to the technical field of printing equipment, in particular to an automatic defect marking device in the book and periodical printing process, which comprises a printing machine main body and a conveyor arranged on the printing machine main body, the conveyor is used for conveying paper and is provided with a plurality of conveyor belts, and a visual identification machine is fixed on the printing machine main body through a support. The visual recognition machine is located over the conveying belt, the S-shaped design of the guide piece is matched with the guide strip, even if the paper is small, the visual recognition machine can still recognize all content on the paper, and the situation of missing detection is avoided; when the content on the paper has defects, the visual identification machine can detect the defects in time and simultaneously drive the discharging mechanism to start, the moving track of the paper with the defects is changed, the paper with the defects is automatically discharged, the automation degree is high, meanwhile, the equipment does not need to stop working, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a device for automatically marking defects in a book and periodical printing process. Background Art

[0002] In the process of book and periodical printing, the transmission and printing quality of paper are key factors affecting the quality of the final product. Existing printing presses usually use a straight rubber strip set on the printing press workbench to compress and limit the paper to prevent the paper from being misplaced during transmission on the conveyor belt. However, this design has certain limitations in practical applications. First, due to the different sizes of paper, the contact range between the rubber strip and the paper is limited. When there is an external force near the equipment (such as people running or carts passing by), the generated wind force may still cause the paper to be misplaced. Therefore, the paper still needs to be manually aligned when it is collected, which increases the labor intensity of the workers, and the accuracy of the alignment cannot be guaranteed.

[0003] In addition, during the printing process, it is inevitable that there will be defects such as unclear printing, misprinting, and missing printing. At present, there are two main ways to remove printing defects: one is manual sampling, which is not only labor-intensive for workers, but also the accuracy of detection cannot be guaranteed; the other is to rely on the visual recognition system. Although the accuracy of detection has been improved, after detecting paper defects, the equipment needs to stop running and rely on manual labor to remove the defective paper. This method causes the equipment to stop working every time a defect occurs on the paper and wait for the defective paper to be discharged, which seriously affects production efficiency. At the same time, workers need to keep an eye on the equipment at all times, which consumes a lot of their mental energy.

[0004] In addition, for some documents with smaller paper, the setting of the rubber strip is very likely to completely block a line of text on the paper, resulting in incomplete detection and missed detection. This not only affects the printing quality, but also increases the subsequent rework costs.

[0005] To sum up, in the existing book and periodical printing process, there is a big contradiction between the stability of paper transmission, the accuracy of defect detection and production efficiency. There is an urgent need for a device that can automatically mark printing defects and improve production efficiency to solve the above problems. To this end, we propose an automatic defect marking device in the book and periodical printing process. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an automatic defect marking device in the process of book and periodical printing, comprising a printing machine body and a conveyor arranged on the printing machine body, the conveyor is used to convey paper, and is provided with a plurality of conveyor belts, a visual recognition machine is fixed on the printing machine body through a bracket, and the visual recognition machine is located directly above the conveyor belt, and further comprises: A guide mechanism, which is installed on the printing machine body and cooperates with the conveyor belt to ensure the straight line conveyance of the paper; The discharge mechanism is installed on the printing machine body and connected to the guiding mechanism. When the equipment is operating normally, the discharge mechanism increases the friction between the paper and the conveyor belt. When the visual recognition machine detects defective paper, the discharge mechanism cooperates with the guiding mechanism to reduce the friction between the defective paper and the conveyor belt, and increase the friction between the defective paper and the guiding mechanism, and at the same time guides the defective paper to the outside of the printing machine body.

[0007] Preferably, the guiding mechanism comprises a gantry arranged on the main body of the printing machine, the gantry is located directly above the conveyor belt, and there are multiple gantry in a linear array, each gantry is provided with a straight groove, the straight groove is vertically connected with a square groove, there are multiple square grooves, each square groove is provided with a rotating shaft, the two ends of the rotating shaft are respectively located on the upper and lower sides of the cross beam part of the gantry, a guide plate is fixed on the rotating shaft, the guide plate is "S" shaped, and a guide strip is provided on the side close to the ground, there are multiple guide strips, and they are all parallel to the conveyor belt.

[0008] Preferably, a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixed to the rotating shaft, and the other end is fixed to the bottom surface of the crossbeam part of the gantry.

[0009] Preferably, the discharge mechanism consists of three parts: a pneumatic part, a conversion part and a trigger part. The pneumatic part is used to adjust the friction between the paper and the conveyor belt and the guide strip. When the visual recognition machine detects defective paper, the conversion part will change the guiding direction of the guide strip for the defective paper. The number of pneumatic parts and trigger parts is equal to that of the gantry, and their positions correspond one to one. The conversion part turns on the trigger part in sequence during operation, and the trigger part drives the corresponding pneumatic part to start.

[0010] Preferably, the pneumatic component comprises an air pump mounted on the printer body, the air pump is connected to a pipe rack, the pipe rack is composed of a plurality of pipes connected to each other, and the ports of the pipes away from the air pump are perpendicular to the ground and located in the gaps between a plurality of conveyor belts.

[0011] Preferably, the conversion member includes a gear sleeved on the rotating shaft, a strip is slidably arranged in the I-shaped groove, a rack is arranged on the strip, the number of the racks is equal to the square groove, and the positions correspond one to one, a convex strip is fixed to one end of the I-shaped groove, an oblique groove is opened on the convex strip, a servo motor is installed on the printing machine body, a main synchronous wheel is sleeved on the output shaft of the servo motor, a support seat is installed on the printing machine body, a secondary synchronous wheel is rotatably arranged on the support seat, the main synchronous wheel and the secondary synchronous wheel are connected by a synchronous toothed belt, an inclined block is arranged on the synchronous toothed belt, there are multiple inclined blocks, and they are evenly arrayed on the outer periphery of the synchronous toothed belt, and the distance between two adjacent inclined blocks is less than the distance between two adjacent I-shaped strips.

[0012] Preferably, the trigger member includes a slide groove provided on the gantry, a slider is slidably arranged in the slide groove, the slider is fixed to a note, a sensor is installed on one side of the slider, a receiver is fixed on the gantry, and the sensor and receiver are arranged relative to each other.

[0013] Preferably, a paper shredder is provided on the printing machine body, and a collection box is provided directly below the paper shredder.

[0014] The present invention has at least the following beneficial effects: 1. Under the action of the guide sheet and the guide strip, when there is no defect in the printed content of the paper, the paper can be smoothly inspected and transmitted in a straight line, and is less affected by external forces; 2. The “S”-shaped design of the guide piece and the guide strip ensure that even when the paper is small, the visual recognition machine can still identify all the contents on the paper to avoid missed detection. 3. When there are defects on the content of the paper, the visual recognition machine can detect it in time and drive the discharge mechanism to start, change the moving trajectory of the defective paper, and automatically discharge the defective paper. The degree of automation is high, and the equipment does not need to stop working, which greatly improves production efficiency; 4. The defective paper discharged from the conveyor belt is automatically crushed and enters the collection box at the same time. This equipment improves the subsequent processing of defective paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure at A in the middle; Figure 3 It is a schematic diagram of the local structure of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at B in the middle; Figure 5 It is a schematic diagram of the local structure of the conversion member of the present invention; Figure 6 It is a partial bottom view structural schematic diagram of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point C in the middle.

[0016] In the figure: 1. Printing machine body; 11. Conveyor; 111. Conveyor belt; 12. Bracket; 13. Visual recognition machine; 2. Guide mechanism; 21. Gantry; 22. Slot; 23. Square slot; 24. Rotating shaft; 241. Torsion spring; 25. Guide plate; 26. Guide strip; 3. Discharge mechanism; 31. Pneumatic part; 311. Air pump; 312. Pipe rack; 32. Converter; 321. Gear; 322. Slot; 323. Rack; 324. Raised strip; 325. Bevel groove; 326. Servo motor; 327. Main synchronous wheel; 328. Support seat; 329. Secondary synchronous wheel; 3210. Synchronous toothed belt; 3211. Bevel block; 33. Trigger; 331. Slide; 332. Slider; 333. Sensor; 334. Receiver; 4. Paper shredder; 5. Collection box. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: See also Figure 1-Figure 7 The present invention provides a technical solution: an automatic defect marking device in the process of book printing, comprising a printing machine body 1 and a conveyor 11 arranged on the printing machine body 1, the conveyor 11 is used to convey paper, and is provided with a plurality of conveyor belts 111, a visual recognition machine 13 is fixed on the printing machine body 1 through a bracket 12, and the visual recognition machine 13 is located directly above the conveyor belt 111, and further comprises: A guide mechanism 2, which is mounted on the printer body 1 and cooperates with the conveyor belt 111 to ensure the straight-line conveyance of the paper; The discharge mechanism 3 is installed on the printing machine body 1 and connected to the guide mechanism 2. When the equipment is operating normally, the discharge mechanism 3 increases the friction between the paper and the conveyor belt 111. When the visual recognition machine 13 detects defective paper, the discharge mechanism 3 cooperates with the guide mechanism 2 to reduce the friction between the defective paper and the conveyor belt 111, and increase the friction between the guide mechanism 2, and at the same time guide the defective paper to the outside of the printing machine body 1.

[0019] The guiding mechanism 2 includes a gantry 21 arranged on the printing machine body 1. The gantry 21 is located directly above the conveyor belt 111, and there are multiple gantry 21 in a linear array. A straight groove 22 is provided on the gantry 21. A square groove 23 is vertically connected to the straight groove 22. There are multiple square grooves 23. A rotating shaft 24 is arranged in each square groove 23. The two ends of the rotating shaft 24 are respectively located on the upper and lower sides of the cross beam part of the gantry 21. A guide piece 25 is fixed on the rotating shaft 24. The guide piece 25 is "S" shaped, and a guide bar 26 is arranged on the side close to the ground. There are multiple guide bars 26, and they are all parallel to the conveyor belt 111.

[0020] A torsion spring 241 is sleeved on the rotating shaft 24 , one end of the torsion spring 241 is fixed to the rotating shaft 24 , and the other end is fixed to the bottom surface of the crossbeam portion of the gantry 21 .

[0021] The torsion spring 241 limits the guide piece 25 through the rotating shaft 24. When the content on the paper is correct, the friction between the guide piece 25 and the paper is prevented from causing the guide piece 25 or the paper to deviate. At the same time, after the subsequent rotating shaft 24 drives the guide piece 25 to move, as the interference force disappears, the torsion spring 241 drives the rotating shaft 24 to automatically reset, avoiding affecting the guidance of subsequent papers.

[0022] The discharge mechanism 3 consists of three parts: a pneumatic part 31, a conversion part 32 and a trigger part 33. The pneumatic part 31 is used to adjust the friction between the paper and the conveyor belt 111 and the guide strip 26. When the visual recognition machine 13 detects defective paper, the conversion part 32 will change the guiding direction of the guide strip 26 for the defective paper. The number of pneumatic parts 31 and trigger parts 33 is equal to that of the gantry 21, and their positions correspond one to one. The conversion part 32 opens the trigger part 33 in sequence during operation, and the trigger part 33 drives the corresponding pneumatic part 31 to start.

[0023] The pneumatic part 31 includes an air pump 311 installed on the printer body 1 , and the air pump 311 is connected to a pipe rack 312 . The pipe rack 312 is composed of multiple pipes connected to each other, and the ports of the pipes away from the air pump 311 are perpendicular to the ground and located in the gaps between the multiple conveyor belts 111 .

[0024] The conversion member 32 includes a gear 321 sleeved on the rotating shaft 24, a strip 322 is slidably arranged in the slot 22, a rack 323 is arranged on the strip 322, the number of the racks 323 is equal to the square slot 23, and the positions correspond to each other, a convex strip 324 is fixed at one end of the strip 322, and an inclined groove 325 is opened on the convex strip 324, a servo motor 326 is installed on the printing machine body 1, and a main synchronous wheel 327 is sleeved on the output shaft of the servo motor 326 A support seat 328 is installed on the printing machine body 1, and a secondary synchronous wheel 329 is rotatably set on the support seat 328. The main synchronous wheel 327 and the secondary synchronous wheel 329 are connected by a synchronous toothed belt 3210. The synchronous toothed belt 3210 is provided with an inclined block 3211. There are multiple inclined blocks 3211, which are evenly arrayed on the outer periphery of the synchronous toothed belt 3210. The distance between two adjacent inclined blocks 3211 is less than the distance between two adjacent one-word strips 322.

[0025] The trigger member 33 includes a slide groove 331 opened on the gantry 21, a slider 332 is slidably arranged in the slide groove 331, the slider 332 is fixed to a note 322, a sensor 333 is installed on one side of the slider 332, a receiver 334 is fixed on the gantry 21, and the sensor 333 and the receiver 334 are arranged opposite to each other.

[0026] A shredder 4 is provided on the printing machine body 1, and a collection box 5 is provided directly below the shredder 4. When the visual recognition machine 13 detects defective paper, the shredder 4 is automatically started, and the defective paper is guided to separate from the conveyor belt 111, and then is shredded by the shredder 4 and falls into the collection box 5, completing the entire process of identifying, discharging, shredding and collecting the defective paper, with a high degree of automation.

[0027] The working principle is as follows: when the printing machine body 1 is transmitting the printed paper, the content on the paper is recognized and detected by the visual recognition machine 13. If the content of the paper is qualified, the paper can be smoothly transported to the next process as the conveyor belt 111 continues to transport. During the transmission of the paper on the conveyor belt 111, even if it is a small paper, the "S"-shaped guide piece 25 will not completely cover a certain line or multiple lines of text on the paper. Compared with the traditional straight-line rubber strip, the time that a certain range of the paper is in contact with the straight-line rubber strip is greatly reduced, ensuring that the visual recognition machine 13 will not miss the inspection. At the same time, the guide strip 26 on the "S"-shaped guide piece 25 is parallel to the direction of paper transmission, further guiding the paper to move in a straight line. The "S"-shaped distribution also increases the contact area with the paper, reducing the probability of deviation due to external interference; It should be noted that the air pump 311 is an existing device for both blowing and suction. When the device is working and no defects are detected on the paper, the air pump 311 is in a vacuum state, that is, negative pressure is generated in the pipe rack 312, which generates a small adsorption force on the paper, increases the friction between the paper and the conveyor belt 111, and further prevents the paper from deflecting during the transmission process. If the visual recognition machine 13 detects that there is a defect in the content on the paper, the servo motor 326 is turned on, and the driving shaft of the servo motor 326 drives the synchronous toothed belt 3210 to transmit through the main synchronous wheel 327 and the auxiliary synchronous wheel 329. During the transmission of the synchronous toothed belt 3210, the inclined block 3211 on its periphery is driven to move synchronously. The inclined block 3211 drives the one-character strip 322 connected to the convex strip 324 to slide in the one-character slot 22 through the inclined slot 325. The rack 323 on the one-character strip 322 drives the gear 321 at the corresponding position to rotate. The gear 321 drives the guide piece 25 to deflect through the rotating shaft 24. At the same time, as the rotating shaft 24 rotates, the torsion spring 241 is deformed. At this time, the guide strip 22 on the guide piece 25 is deformed. 6 is offset from the conveying direction of the conveying, and as the word strip 322 moves, the word strip 322 synchronously drives the slider 332 to slide in the slide groove 331, driving the sensor 333 and the receiver 334 to contact. After the sensor 333 and the receiver 334 contact, the blowing and suction state of the air pump 311 at the corresponding position is changed, that is, when the defective paper moves to the position of the first gantry 21, the wind force of the pipe rack 312 at the position of the first gantry 21 will change from negative pressure to positive pressure, reducing the friction between the paper and the conveyor belt 111. At the same time, the guide piece 25 corresponding to the first gantry 21 is in an inclined state. At this time, as the conveyor belt 111 continues to transport, the defective paper will be offset to a certain extent along the direction of the guide strip 26; Since the spacing between the inclined blocks 3211 is smaller than the spacing between the one-character strips 322, the inclined blocks 3211 will trigger the one-character strips 322 in sequence during their movement, corresponding to the moving position of the defective paper. When the defective paper moves to the subsequent gantry 21, the gantry 21 and the connecting mechanism at the corresponding position undergo the same changes as mentioned above. When the defective paper moves to the position of the second gantry 21, the inclined block 3211 corresponding to the position of the second gantry 21 contacts the one-character strip 322 corresponding thereto. At this time, the inclined block 3211 corresponding to the position of the first gantry 21 is separated from the one-character strip 322 corresponding thereto, and the interference of the inclined block 3211 corresponding to the position of the first gantry 21 is lost. The one-character strip 322 corresponding to the first gantry 21 is reset synchronously with the resetting of the torsion spring 241, which facilitates the detection of subsequent paper.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for automatically marking defects in a book or periodical printing process, comprising a printing machine body (1) and a conveyor (11) arranged on the printing machine body (1), the conveyor (11) being used to convey paper and being provided with a plurality of conveyor belts (111), a visual recognition machine (13) being fixed to the printing machine body (1) via a bracket (12), the visual recognition machine (13) being located directly above the conveyor belt (111), and characterized in that: Also includes: A guide mechanism (2), the guide mechanism (2) being mounted on the printing machine body (1) and cooperating with the conveyor belt (111) to ensure the straight-line conveyance of the paper; The discharge mechanism (3) is mounted on the printing machine body (1) and connected to the guide mechanism (2). When the device is operating normally, the discharge mechanism (3) increases the friction between the paper and the conveyor belt (111). When the visual recognition machine (13) detects defective paper, the discharge mechanism (3) cooperates with the guide mechanism (2) to reduce the friction between the defective paper and the conveyor belt (111) and increase the friction between the defective paper and the guide mechanism (2), thereby guiding the defective paper to the outside of the printing machine body (1).

2. The automatic defect marking device in the book and periodical printing process according to claim 1 is characterized by: The guide mechanism (2) comprises a gantry (21) arranged on the printing machine body (1). The gantry (21) is located directly above the conveyor belt (111) and is provided in a plurality in a linear array. Each of the gantry (21) is provided with a straight groove (22). A square groove (23) is vertically connected to the straight groove (22). There are a plurality of square grooves (23). A rotating shaft (24) is provided in each of the square grooves (23). The two ends of the rotating shaft (24) are respectively located on the upper and lower sides of the cross beam portion of the gantry (21). A guide piece (25) is fixed on the rotating shaft (24). The guide piece (25) is in an "S" shape and a guide bar (26) is provided on a side close to the ground. There are a plurality of guide bars (26) and they are all parallel to the conveyor belt (111).

3. The automatic defect marking device in the book and periodical printing process according to claim 2 is characterized by: A torsion spring (241) is sleeved on the rotating shaft (24), one end of the torsion spring (241) is fixed to the rotating shaft (24), and the other end is fixed to the bottom surface of the crossbeam portion of the gantry (21).

4. The automatic defect marking device in the book and periodical printing process according to claim 3 is characterized by: The discharge mechanism (3) is composed of three parts: a pneumatic part (31), a conversion part (32) and a trigger part (33). The pneumatic part (31) is used to adjust the friction between the paper and the conveyor belt (111) and the guide strip (26). When the visual recognition machine (13) detects defective paper, the conversion part (32) changes the guiding direction of the guide strip (26) for the defective paper. The number of pneumatic parts (31) and the trigger part (33) is equal to that of the gantry (21), and the positions correspond one to one. During the operation, the conversion part (32) sequentially activates the trigger part (33), and the trigger part (33) drives the corresponding pneumatic part (31) to start.

5. The automatic defect marking device in the book and periodical printing process according to claim 4 is characterized by: The pneumatic component (31) comprises an air pump (311) mounted on the printing machine body (1); the air pump (311) is connected to a pipe rack (312); the pipe rack (312) is composed of a plurality of pipes connected to each other; and the ports of the pipes away from the air pump (311) are perpendicular to the ground and are located in the gaps between the plurality of conveyor belts (111).

6. The automatic defect marking device in the book and periodical printing process according to claim 5 is characterized by: The conversion member (32) comprises a gear (321) sleeved on a rotating shaft (24); a strip (322) is slidably arranged in the slot (22); a rack (323) is arranged on the strip (322); the number of the racks (323) is equal to the number of the square slots (23), and the positions are one-to-one corresponding; a convex strip (324) is fixed to one end of the strip (322); an inclined groove (325) is formed on the convex strip (324); a servo motor (326) is mounted on the output shaft of the servo motor (326); A step wheel (327), a support seat (328) is installed on the printing machine body (1), a secondary synchronous wheel (329) is rotatably arranged on the support seat (328), the main synchronous wheel (327) and the secondary synchronous wheel (329) are connected by a synchronous toothed belt (3210), and an inclined block (3211) is arranged on the synchronous toothed belt (3210), and there are multiple inclined blocks (3211) that are evenly arrayed on the outer periphery of the synchronous toothed belt (3210), and the distance between two adjacent inclined blocks (3211) is smaller than the distance between two adjacent one-word strips (322).

7. The automatic defect marking device in the book and periodical printing process according to claim 6 is characterized by: The trigger member (33) comprises a slide groove (331) provided on the gantry (21), a slider (332) being slidably arranged in the slide groove (331), the slider (332) being fixed to a note (322), a sensor (333) being installed on one side of the slider (332), a receiver (334) being fixed on the gantry (21), and the sensor (333) and the receiver (334) being arranged opposite to each other.

8. The automatic defect marking device in the book and periodical printing process according to claim 7 is characterized by: A paper shredder (4) is provided on the printing machine body (1), and a collection box (5) is provided directly below the paper shredder (4).

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