Defect detection and rejection apparatus for a cross-cut machine and control method thereof

Abstract

The application provides a defect detection and rejection device for a cross cutting machine and a control method thereof, wherein the defect detection and rejection device for the cross cutting machine comprises a rack, a controller, a defect detection mechanism and a spiral cutter paper cutting mechanism, the rack is sequentially provided with a pay-off mechanism for laying a reel paper, an incremental encoder, a waste product rejection mechanism and a paper arrangement and collecting mechanism from front to back, the defect detection mechanism is arranged between the pay-off mechanism and the incremental encoder, the spiral cutter paper cutting mechanism is arranged between the incremental encoder and the waste product rejection mechanism, and the defect detection mechanism, the spiral cutter paper cutting mechanism, the waste product rejection mechanism, the incremental encoder and the paper arrangement and collecting mechanism are electrically connected with the controller. According to the application, the cutter signal is used instead of the photoelectric signal used by other visual systems, and the positioning virtual frame ID prediction acquisition solves the problems of reel paper surface imaging, defect detection in a single sheet mode and waste product rejection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cross cutting machine, in particular to a defect detection and rejection device for cross cutting machine and a control method thereof. BACKGROUND

[0002] The cross cutting machine is used for cutting the roll paper or other roll material into a certain specification of paper. The roll paper may produce surface defects such as color difference, white spot, black spot, wrinkle and scratch during the production process. At present, there are two schemes for surface defect detection technology of roll paper. The first scheme is to install a surface defect detection system on an online production equipment such as a roll paper compound machine to perform online detection. The second scheme is to perform defect detection after cross cutting by using a single sheet detection platform.

[0003] In the first scheme, the high speed of paper running during the production process of roll material leads to inaccurate control of waste rejection. In addition, due to the production process requirements, the compound machine cannot be frequently started and stopped during the production process, so the waste can only be marked but cannot be rejected during the online production process of the compound machine. In the second scheme, the single sheet detection platform has the disadvantages of complex structure, high cost, large equipment area and the like.

[0004] The above two schemes cannot efficiently and economically complete the surface defect detection of roll paper and the accurate rejection of defective products. The mainstream cross cutting machines on the market do not have enough space and paper running distance to provide a surface defect detection system after completing the cross cutting of roll paper, so as to realize detection and accurate rejection in a single sheet detection mode. Therefore, the existing cross cutting machines do not have a surface defect detection system and rely on manual sampling inspection to judge the surface quality of roll paper.

[0005] Therefore, the prior art needs to be improved and enhanced. SUMMARY

[0006] In view of the above shortcomings of the prior art, the present application aims to provide a defect detection and rejection device for cross cutting machine and a control method thereof. The device can use the cross cutting machine cutter signal instead of the photoelectric trigger signal used by other visual detection systems, and use the virtual photoelectric trigger positioning technology to enable the surface defect detection system to be applied to the existing cross cutting machine. The surface detection and accurate rejection of waste products during the production process of roll paper are solved, the production efficiency is improved, the product quality is enhanced, and the installation space of the equipment is saved.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0008] The application discloses a defect detection and rejection device for a cross cutting machine, which comprises a rack, a controller, a defect detection mechanism and a spiral knife cutting mechanism.

[0009] Further, the defect detection mechanism comprises a front light source and a back light source which irradiate the surface of the web paper, a camera which is arranged opposite to the back light source and faces the surface of the web paper irradiated by the front light source, and a photoelectric sensor arranged at the paper entry side of the defect detection mechanism.

[0010] Further, the spiral knife cutting mechanism comprises two rollers which are arranged opposite to each other and are provided with spiral knives.

[0011] Further, a traction mechanism for tensioning the web paper is arranged at the paper entry side of the spiral knife cutting mechanism.

[0012] Further, a single web paper conveying mechanism is arranged between the spiral knife cutting mechanism and the waste rejection mechanism, and the single web paper conveying mechanism comprises a driving roller for driving the paper to advance and a pressing pipe for pressing the paper.

[0013] Further, the waste rejection mechanism comprises a first conveying mechanism, a second conveying mechanism and a paper blocking device, the first conveying mechanism and the second conveying mechanism are arranged adjacent to each other and are provided with a spacing therebetween, the paper blocking device is arranged above the first conveying mechanism and the second conveying mechanism, and the paper blocking device is electrically connected with the controller.

[0014] Further, the spacing comprises a first spacing between the upper end of the first conveying mechanism and the upper end of the second conveying mechanism and a second spacing between the lower end of the first conveying mechanism and the lower end of the second conveying mechanism, and the first spacing is larger than the second spacing.

[0015] Further, the paper blocking device comprises a cylinder and a blocking plate, the blocking plate is rotatably connected with the piston end of the cylinder, and the cylinder is fixed with the rack.

[0016] The control method of the defect detection and rejection device for the cross cutting machine comprises the following steps:

[0017] In S110, the controller acquires the cutter trigger signal of the spiral cutter mechanism and uses it as the photoelectric trigger signal of the defect detection mechanism.

[0018] In S120, the controller calculates the pulse number of the incremental encoder according to the photoelectric trigger signal, generates a virtual frame based on the pulse number, the distance between the spiral cutter mechanism and the image acquisition position of the defect detection mechanism, and the height of the large-size product after the cross cutting of the roll paper.

[0019] In S130, when the virtual frame reaches the position of the defect detection mechanism, the controller triggers the defect detection mechanism to acquire an image and upload a virtual frame ID, and sends the detection result of the defect detection mechanism to the controller.

[0020] In S140, when the virtual frame reaches the waste rejection mechanism, the controller controls the waste rejection mechanism to reject the large-size product.

[0021] Further, the virtual frame is the pulse signal corresponding to the roll paper after the roll paper is divided by the spiral cutter mechanism before passing through the image acquisition position.

[0022] Compared with the prior art, the defect detection and rejection device for the cross cutting machine provided by the present application comprises a rack, a controller, a defect detection mechanism, and a spiral cutter mechanism. The rack is sequentially provided with a roll paper unwinding mechanism, an incremental encoder, a waste rejection mechanism, and a paper arrangement and collecting mechanism from front to back. The defect detection mechanism is arranged between the roll paper unwinding mechanism and the incremental encoder. The spiral cutter mechanism is arranged between the incremental encoder and the waste rejection mechanism. The defect detection mechanism, the spiral cutter mechanism, the waste rejection mechanism, the incremental encoder, and the paper arrangement and collecting mechanism are electrically connected to the controller. For the present application, the cutter signal of the spiral cutter mechanism is used instead of the photoelectric trigger signal used by other visual detection systems. The detection positioning prediction, virtual frame ID technology, and image acquisition in the defect detection mechanism solve the problems of roll material surface imaging, single sheet mode defect detection, and accurate waste rejection. Compared with the large single sheet mechanical structure, the present application saves the installation space by directly installing the detection system on the cross cutting machine. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings shown are within the scope of protection of the present application.

[0024] Figure 1 The system layout schematic diagram of the defect detection and rejection device for the cross cutting machine provided by the present application.

[0025] Figure 2 The structure schematic diagram of the defect detection mechanism provided by the present application.

[0026] Figure 3 The structure schematic diagram of the waste rejection mechanism provided by the present application.

[0027] Figure 4 The system composition schematic diagram of the defect detection and rejection device provided by the present application.

[0028] Figure 5 The flow chart of the control method of the defect detection and rejection device provided by the present application.

[0029] In the figure: rack-1, defect detection mechanism-2, spiral knife paper cutting mechanism-3, unwinding mechanism-4, incremental encoder-5, waste rejection mechanism-6, paper arrangement and collecting mechanism-7, deviation correction conveying mechanism-8, front light source-9, back light source-10, camera-11, photoelectric sensor-12, pressure roller-13, deviation correction conveying frame-14, traction mechanism-15, single web conveying mechanism-16, driving roller-17, pressure tube-18, first transmission mechanism-19, second transmission mechanism-20, paper blocking device-21, air cylinder-22, baffle-23, mounting plate-24. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0031] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0032] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0033] As shown in Figure 1 , Figure 2 , Figure 4 and Figure 5 , the present application provides a defect detection and rejection device for a cross cutting machine, which comprises a rack 1, a controller (not shown in the figure), a defect detection mechanism 2 and a spiral knife cutting mechanism 3. The rack 1 is sequentially provided with a pay-off mechanism 4 for laying the roll paper, an incremental encoder 5, a waste rejection mechanism 6 and a paper arrangement and collecting mechanism 7 from front to back. The defect detection mechanism 2 is arranged between the pay-off mechanism 4 and the incremental encoder 5. The spiral knife cutting mechanism 3 is arranged between the incremental encoder and the waste rejection mechanism 6. The defect detection mechanism 2, the spiral knife cutting mechanism 3, the waste rejection mechanism 6, the incremental encoder 5 and the paper arrangement and collecting mechanism 7 are electrically connected with the controller. The controller takes the cutter trigger signal of the spiral knife cutting mechanism (3) as the photoelectric trigger signal of the defect detection mechanism (2), and controls the action state of the waste rejection mechanism (6) according to the pulse of the incremental encoder (5) and the detection result of the defect detection mechanism (2).

[0034] The present application solves the space problem of adding a detection system to the cross cutting machine in the field production operation by moving the defect detection mechanism 2 between the spiral knife cutting mechanism 3. The defect detection mechanism 2 can be used for image data acquisition. The cutter signal of the spiral knife cutting mechanism 3 is used as the photoelectric trigger signal for dividing into single roll paper, thereby solving the problem that the photoelectric sensor 12 cannot obtain the trigger signal for the white paper without pattern and without reflective mark, including ordinary white paper, copper plate paper and laser paper and other special effect paper. Compared with the prior art, the defect rejection mechanism 6 for the cross cutting machine of the present application can solve the problems of imaging on the roll paper surface, single mode defect detection and accurate waste rejection by using detection positioning prediction, virtual frame ID technology and detection control system. The equipment investment cost is significantly reduced, and the equipment operation stability and detection efficiency are higher.

[0035] It should be noted that the defect detection mechanism 2 and the controller can form an image processing system for image data acquisition, processing operation; the controller includes a synchronization box, a synchronization control card is arranged in the synchronization box, the synchronization control card is used for virtual and accurate tracking of photoelectric signal, so as to realize the preparation position elimination; the incremental encoder 5 is used for collecting the information of the movement of the paper roll; the defect detection mechanism 2, the spiral knife paper cutting mechanism 3, the waste paper elimination mechanism 6, the incremental encoder 5 and the paper arrangement and collecting mechanism 7 are electrically connected with the controller to form the detection control system.

[0036] In an embodiment, as shown in Figure 2 The defect detection mechanism 2 includes a front light source 9 and a back light source 10 irradiating on the surface of the paper roll and a camera 11 arranged opposite to the back light source 10 and facing the surface of the paper roll illuminated by the front light source 9. An optical sensor 12 is arranged above the direction of the paper roll and at the upper left of the back light source 10, and the optical sensor 12 is fixed with the rack 1. The camera 11, the front light source 9 and the back light source 10 can form an imaging system, wherein the image processing system includes the imaging system, and the imaging system can complete the imaging of the paper roll, that is, the data acquisition of the surface image of the paper roll.

[0037] It should be noted that the camera 11 and the front light source 9 are both mounted on the mounting plate 24 of the defect detection mechanism 2, and the mounting plate 24 is stacked by a plurality of mounting units, which are paperboards or wooden boards with small thickness, as shown in Figure 2 Due to the proportional reduction of the equipment, the mounting plate 24 appears to be nearly black filled in the figure.

[0038] Further, one end of the defect detection mechanism 2 is provided with a deviation correction conveying mechanism 8, which includes a deviation correction conveying frame 14, which can prevent the paper roll from deviating during conveying and reduce the detection false alarm caused by the deviation of the paper roll.

[0039] The spiral knife paper cutting mechanism is used for cutting the continuous paper roll into a certain specification of paper roll.

[0040] Preferably, as shown in Figure 1 A traction mechanism 15 for tensioning the paper roll is arranged on one side of the paper entering side of the spiral knife paper cutting mechanism 3, which can stretch and flatten the paper roll to be transported to the spiral knife paper cutting mechanism 3, so as to ensure that the paper roll can smoothly enter the spiral knife mechanism and complete the cutting work.

[0041] Further, asFigure 1 As shown in the figure, the spiral knife cutting mechanism 3 and the waste removing mechanism 6 are provided with a single sheet web conveying mechanism 16, which comprises a driving roller 17 for driving the paper forward, a pressure tube 18 and a pressure roller 13 on the pressure tube 18 for contacting the web. After the web is cut into sheets of paper with certain specifications, the paper will enter the single sheet web conveying mechanism 16, and the paper will enter between the driving roller 17 and the pressure tube 18. Under the rotation of the driving roller 17 and the pressure roller 13 on the pressure tube 18, the paper will be smoothly conveyed to the waste removing mechanism 6, and the pressure tube 18 can prevent the paper from being raised to affect the conveying.

[0042] It should be noted that the web is different from ordinary webs, and the web has a certain hardness. After the web is cut into sheets of paper with certain specifications by the spiral knife cutting mechanism 3, the paper can still enter the driving roller 17 of the single sheet web conveying mechanism 16 horizontally, and can smoothly enter the waste removing mechanism 6 under the action of the driving roller 17 and the pressure tube 18.

[0043] Further, as shown in the figures, Figure 1 and Figure 3 the waste removing mechanism 6 comprises a first conveying mechanism, a second conveying mechanism 20 and a paper blocking device 21. The first conveying mechanism 19 and the second conveying mechanism 20 are arranged adjacent to each other, and a gap is provided between the first conveying mechanism 19 and the second conveying mechanism 20. The paper blocking device is arranged above the first conveying mechanism 19 and the second conveying mechanism 20, and the paper blocking device is electrically connected with the controller. When the cut paper enters the waste removing mechanism 6, if the paper is waste, the paper blocking device 21 allows the paper to enter between the first conveying mechanism 19 and the second conveying mechanism 20, and finally enters the waste storage area under the driving of the first conveying mechanism 19 and the second conveying mechanism 20. If the paper is a qualified product, the paper blocking device will block the paper from entering between the first conveying mechanism and the second conveying mechanism 20, i.e. the paper will enter the paper arranging and collecting mechanism 7, and finally be conveyed to the designated qualified product storage area.

[0044] Specifically, the gap comprises a first gap between the upper end of the first conveying mechanism 19 and the upper end of the second conveying mechanism 20, and a second gap between the lower end of the first conveying mechanism and the lower end of the second conveying mechanism 20. The first gap is larger than the second gap, which can allow the waste paper to smoothly enter between the first conveying mechanism 19 and the second conveying mechanism 20.

[0045] Further, as shown in the figures, Figure 3As shown, the paper blocking device includes a cylinder 22 and a blocking plate 23, the blocking plate 23 is rotatably connected with the piston end of the cylinder 22, and the cylinder 22 is fixed with the rack 1. When the waste paper reaches the waste paper removing mechanism 6, the controller controls the air rod of the cylinder 22 to extend outward, so that the blocking plate 23 tilts to the left, so that the waste paper enters between the first conveying mechanism 19 and the second conveying mechanism 20, and finally enters the designated waste storage area. It should be pointed out that the connection position of the rotatable connection of the blocking plate 23 with the piston end of the cylinder 22 is located at the right center of gravity of the blocking plate 23, that is, when the air rod of the cylinder 22 extends outward, that is, when the air rod of the cylinder 22 extends outward, the connection position is taken as the boundary, the left side of the blocking plate 23 is heavier, that is, when the air rod of the cylinder 23 extends outward, the blocking plate 23 will tilt to the left with the left edge as the fulcrum.

[0046] As shown in Figure 1 , Figure 4 and Figure 5 , the control method of the defect detection and waste removal device for the cross cutting machine comprises:

[0047] S110, the controller acquires the cutter trigger signal of the spiral cutter cutting mechanism 3, and takes it as the photoelectric trigger signal of the defect detection mechanism 2;

[0048] S120, the synchronization box in the controller receives the photoelectric trigger signal to calculate the pulse number of the incremental encoder 5, and generates a virtual frame based on the distance between the spiral cutter cutting mechanism and the image acquisition position of the defect detection mechanism 2, the height of the large-size product after the cross cutting of the roll paper, and the pulse as the reference;

[0049] S130, when the virtual frame reaches the position of the defect detection mechanism 2, the synchronization control card in the synchronization box triggers the defect detection mechanism 2 to collect images and upload the virtual frame ID, and sends the detection result of the defect detection mechanism to the synchronization control card;

[0050] S140, when the virtual frame front reaches the waste removing mechanism, the synchronization control card controls the waste removing mechanism 6 to remove the large-size product.

[0051] Further, the virtual frame is the pulse signal corresponding to the roll paper after the roll paper is cut by the spiral cutter cutting mechanism 3 before passing through the image acquisition position. That is, the virtual frame is a kind of trigger signal corresponding to the position of the roll paper after being cut and before the image acquisition position, which can make the controller take corresponding control actions, such as image acquisition starting action, removal action, etc.

[0052] It can be understood that the cutter trigger signal of the spiral cutter paper cutting mechanism 3 is input into the synchronization box as a photoelectric trigger signal, and when the synchronization box receives the cutter trigger signal, the number of synchronization calculation pulses is calculated, and according to the image acquisition position of the spiral cutter paper cutting mechanism 3 and the defect detection mechanism 2, the height of the large sheet, the virtual frame is generated based on the pulse, and the specific calculation method is as follows: the virtual position of the photoelectric sensor 12: Wherein, d is the distance between the image acquisition position and the spiral cutter paper cutting mechanism 3, h is the height of the large sheet product cut from the roll paper, the virtual frame will continuously move forward with the operation of the machine, when the virtual frame reaches the image acquisition position, the synchronization control card will trigger the detection system to acquire images and upload the ID of the virtual frame. When the detection system completes image acquisition, data analysis and other processes, the detection result of the current virtual frame is sent to the synchronization control card, and when the front of the virtual frame reaches the waste removal mechanism 6, the synchronization control card will control the waste removal mechanism 6 according to the detection result whether to remove the waste.

[0053] It should be noted that the height of the large sheet product is the length of the roll paper after cutting, and the width of the roll paper before and after cutting remains unchanged.

[0054] In summary, the defect detection and waste removal device for the cross cutting machine provided by the present application solves the space problem of adding a detection system to the cross cutting machine in the production site by moving the defect detection mechanism between the spiral cutter paper cutting mechanisms, the defect detection mechanism can be used for image data acquisition, and the cutter signal of the spiral cutter paper cutting mechanism is used as a photoelectric trigger signal for dividing the roll paper into single sheets, thereby solving the problem that the photoelectric sensor cannot obtain a trigger signal from white paper, including ordinary white paper, copper paper and laser paper and other special effect paper. Compared with the prior art, the technical scheme of the present application can detect the surface of the roll paper and accurately remove waste, improve production efficiency, enhance product quality, and save installation space of the equipment.

[0055] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative, not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. A defect detection and rejection device for a cross-cutting machine, characterized in that, The system includes a frame (1), a controller, a defect detection mechanism (2), and a spiral cutting mechanism (3). The frame (1) is sequentially equipped with an unwinding mechanism (4), an incremental encoder (5), a waste rejection mechanism (6), and a paper sorting and collecting mechanism (7). The defect detection mechanism (2) is located between the unwinding mechanism (4) and the incremental encoder (5). The spiral cutting mechanism (3) is located between the incremental encoder (5) and the waste rejection mechanism (6). The defect detection mechanism (2), spiral cutting mechanism (3), waste rejection mechanism (6), incremental encoder (5), and paper sorting and collecting mechanism (7) are connected to the controller. Electrically connected, the defect detection mechanism (2) includes a front light source (9) and a back light source (10) that are irradiated relative to each other on the surface of the roll paper, a camera (11) that is disposed opposite to the back light source (10) and facing the surface of the roll paper illuminated by the front light source (9), and a photoelectric sensor (12) disposed on the paper feeding side of the defect detection mechanism (2). A deviation correction conveying mechanism (8) is disposed between the spiral cutting mechanism (3) and the unwinding mechanism (4). The camera (11) and the front light source (9) are both mounted on the mounting plate (24) of the defect detection mechanism (2). The mounting plate (24) is composed of multiple stacked mounting units. The controller uses the cutting trigger signal of the spiral blade paper cutting mechanism (3) as the photoelectric trigger signal of the defect detection mechanism (2), and controls the operation state of the waste rejection mechanism (6) according to the pulse of the incremental encoder (5) and the detection result of the defect detection mechanism (2).

2. The defect detection and rejection device for a cross-cutting machine according to claim 1, characterized in that, A traction mechanism (15) for tensioning the roll of paper is provided on the side of the spiral paper cutting mechanism (3) where the paper is fed.

3. The defect detection and rejection device for a cross-cutting machine according to claim 1, characterized in that, A single-sheet roll paper conveying mechanism (16) is provided between the spiral paper cutting mechanism (3) and the waste rejection mechanism (6). The single-sheet roll paper conveying mechanism includes an active roller (17) for driving the paper forward, a pressure tube (18), and a pressure roller (13) on the pressure tube (18) that contacts the roll paper.

4. The defect detection and rejection device for a cross-cutting machine according to claim 1, characterized in that, The waste removal mechanism (6) includes a first transmission mechanism (19), a second transmission mechanism (20), and a paper blocking device (21). The first transmission mechanism (19) and the second transmission mechanism (20) are arranged adjacent to each other, and a gap is provided between the first transmission mechanism (19) and the second transmission mechanism (20). The paper blocking device (21) is arranged above the first transmission mechanism (19) and the second transmission mechanism (20), and the paper blocking device (21) is electrically connected to the controller.

5. The defect detection and rejection device for a cross-cutting machine according to claim 4, characterized in that, The spacing includes a first spacing between the upper end of the first transmission mechanism (19) and the upper end of the second transmission mechanism (20) and a second spacing between the lower end of the first transmission mechanism (19) and the lower end of the second transmission mechanism (20), wherein the first spacing is greater than the second spacing.

6. The defect detection and rejection device for a cross-cutting machine according to claim 4, characterized in that, The paper-blocking device (21) includes a cylinder (22) and a baffle (23). The baffle (23) is rotatably connected to the piston end of the cylinder (22), and the cylinder (22) is fixed to the frame (1).

7. A control method for a defect detection and rejection device for a cross-cutting machine as described in any one of claims 1-6, comprising: S110. The controller obtains the cutting trigger signal of the spiral knife paper cutting mechanism (3) and uses it as the photoelectric trigger signal of the defect detection mechanism (2). S120. The controller calculates the number of pulses of the incremental encoder (5) based on the photoelectric trigger signal, and generates a virtual frame based on the pulses according to the distance between the image acquisition position of the spiral paper cutting mechanism (3) and the defect detection mechanism (2) and the height of the large sheet product after the roll paper is cut horizontally. S130. When the virtual frame reaches the position of the defect detection mechanism (2), the controller triggers the defect detection mechanism (2) to acquire an image and upload the virtual frame ID, and sends the detection result of the defect detection mechanism (2) to the controller. S140. When the virtual frame arrives at the waste rejection mechanism (6), the controller controls the waste rejection mechanism (6) to reject the large sheet of product.

8. The control method for the defect detection and rejection device for a cross-cutting machine according to claim 7, characterized in that, The virtual frame is the pulse signal corresponding to the paper roll after it has been separated from the spiral paper cutting mechanism (3) before passing the image acquisition position.

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