Encoder-based waste kicking signal control mechanism of web press and implementation method

Abstract

The invention relates to a web press waste kicking signal control mechanism based on an encoder and an implementation method, and belongs to the technical field of printing machinery. And the control mechanism comprises a visual detection system, a mark spraying and marking module, a three-stage delay control module and a waste kicking mechanism. An initial pulse value is collected through a first encoder, and the front end target position of the paper guide wheel is calculated in combination with a preset delay value; after fixed counting is performed by a paper guide wheel blade sensor, the second encoder and the third encoder respectively calculate the pulse number corresponding to the length of the conveying belt, and finally the waste kicking mechanism is triggered to execute waste rejection. According to the control method disclosed by the invention, through the steps of waste detection, multi-stage delay treatment and waste removal, accurate removal of a single piece of waste is realized. The problem that waste rejection is not accurate due to mechanical transmission delay of a traditional waste rejection system is solved, and the quality of printed matter and the production efficiency are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of web printing machinery, and in particular to an encoder-based waste ejection signal control mechanism of a web printing press and an implementation method thereof. Background Art

[0002] In the web printing industry, quality control during the printing process has become increasingly critical as market demands for printed product quality continue to rise and the demand for production efficiency continues to grow. Web offset presses, with their high production capacity, are widely used in a wide range of industries, including food, books and periodicals, cosmetics, cigarette packaging, and electronic packaging. This has helped my country become a major printing industry powerhouse. Against this backdrop, machine vision inspection technology has emerged as a crucial tool for large and medium-sized printing companies to ensure print quality.

[0003] Currently, online quality inspection systems are widely used in web offset printing presses. They can monitor various defects that occur during the printing process, as well as defects in the raw paper itself, in real time and issue prompts, making a significant contribution to improving printing quality. However, existing technologies still have many problems that need to be solved: Inaccurate ejection signal transmission: During web printing, print speeds can reach 45,000 sheets per hour. While the online inspection system can promptly detect defective products and output ejection signals, the complex structure of the printing press, the long material transmission path between the inspection point and the ejection mechanism, and the unstable speed of printed products during transmission make it difficult to accurately transmit the ejection signal to the ejection mechanism. This results in the ejection action being either too early, causing normal printed products to be accidentally ejected, or too late, preventing defective products from being removed in a timely manner, seriously affecting print quality and production efficiency.

[0004] Low rejection efficiency: Traditional methods of rejecting waste mostly rely on manual participation, such as manual spraying and manual rejection. This method not only consumes a lot of manpower costs, but also in a high-speed printing environment, the speed and accuracy of manual operation are difficult to guarantee. At the same time, manual inspection is prone to mislabeling, resulting in additional waste. In addition, some automated rejection methods, such as air blowing or flip-up rejection, although automated to a certain extent, have the problem of too large a rejection range. Normal printed materials around the waste products are often rejected, resulting in material waste. In addition, manual inspection and re-sorting of qualified products that were mistakenly rejected are required, which increases subsequent processing costs.

[0005] Poor system adaptability: The existing reject signal control system and rejection mechanism struggled to quickly and accurately handle the continuous generation of rejects or the rapid generation of multiple rejects (e.g., one every other reject) that can occur during high-speed printing. In such situations, the existing mechanism was unable to accurately locate individual rejects, and the rejection process easily interfered with adjacent qualified products, leading to unstable production line operation and frequent downtime for adjustments, severely impacting production schedules.

[0006] In summary, the current web-fed printing presses have shortcomings in terms of waste ejection signal control and waste rejection, and an innovative technical solution is urgently needed to address them. It is against this backdrop that the present invention aims to provide an encoder-based waste ejection signal control mechanism for a web-fed printing press, which can achieve accurate transmission and efficient processing of waste ejection signals, improve rejection efficiency, and enhance the system's adaptability to different waste situations, thereby promoting the high-quality development of the web-fed printing industry. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to overcome the shortcomings of the existing related technologies, and the purpose of the present invention is to provide a waste kicking signal control mechanism and implementation method of a roll-fed printing press based on an encoder. Under high-speed printing conditions, with the help of the waste rejection signal output by the quality online system, the waste can be accurately rejected after folding and before stacking. The key to achieving this goal is to accurately delay the waste rejection signal given by the detection system to the position of the conveyor belt after folding and before stacking, so as to ensure that the waste kicking mechanism can perform operations based on precise signals, thereby solving the problem in the prior art that the waste cannot be timely and accurately rejected due to inaccurate transmission of the waste kicking signal, improving the quality of printed products, avoiding the flow of defective products into the market, and reducing the adverse effects on printing companies and end users.

[0008] In order to achieve the above-mentioned object, the first aspect of the present invention provides an encoder-based waste ejection signal control mechanism for a web printing press, comprising: Visual inspection system, used to detect the quality of printed products in real time and generate NG rejection signals; The spray marking module is located at the position of the triangle plate and is used to mark the waste products in response to the NG rejection signal; the spray marking signal serves as a zero position signal; Three-level delay control module, including: The first-stage delay unit uses encoder 1 to collect the initial pulse value X when the marking mark is triggered, and calculates the target position (X+Y) of the front end of the paper guide roller based on the preset pulse delay value Y. Where Y is the distance from the kick mark position to the front end of the paper guide roller divided by the pulse resolution of encoder 1 to obtain the number of pulses. The second-stage delay unit counts the number of blade triggering times Z through the paper guide wheel blade sensor and delays the signal to the front end of the conveyor belt. The third-stage delay unit calculates the pulse delay value N corresponding to the length of conveyor belt 1 and the pulse delay value B corresponding to the length of conveyor belt 2 through encoder 2 and encoder 3, respectively, and ultimately delays the signal to the execution position of the waste kicking mechanism. Encoder 2 reads the current pulse value M after the blade sensor is triggered Z times, where N is the number of pulses obtained by dividing the length of conveyor belt 1 by the pulse resolution of encoder 2. Encoder 3 reads the current pulse value A when the encoder 2 pulse reaches M+N, where B is the number of pulses obtained by dividing the length of conveyor belt 2 by the pulse resolution of encoder 3. The waste kicking mechanism is arranged at the waste kicking position and is used to perform a single waste product removal action according to the signal output by the third-level delay unit.

[0009] Furthermore, a visual inspection station, a paper guide wheel device and a conveyor belt system are sequentially arranged along the paper transmission direction.

[0010] Furthermore, the visual inspection system is provided at a visual inspection station, which is provided with an encoder 1 synchronized with the printing cylinder; The encoder 1 is used to record the current pulse value X when receiving the NG signal of the visual inspection system, and activate the guide wheel blade counting when the accumulated pulses of the encoder 1 reach X+Y, where Y is a pulse delay value preset based on the paper path length from the inspection station to the guide wheel and the resolution of the encoder 1.

[0011] Furthermore, the rotating shaft of the paper guide roller device is equipped with a blade sensor for counting the number of blade triggering times Z to achieve the function of delaying the signal to the front end of the conveyor belt; The number of blades of the paper guide wheel is fixed and evenly distributed, and the fixed count Z is determined according to the number of times the blade triggers the sensor required for the paper guide wheel to rotate a fixed angle to place the product on the conveyor belt.

[0012] Furthermore, the conveyor belt system comprises a conveyor belt 1 and a conveyor belt 2 sequentially arranged along the paper transmission direction; The conveyor belt 1 is equipped with an encoder 2, which is used to calculate the number of pulses N corresponding to the length of the conveyor belt 1; The conveyor belt 2 is equipped with an encoder 3, which is used to calculate the number of pulses B corresponding to the length of the conveyor belt 2.

[0013] Furthermore, after the blade sensor of the paper guide wheel device is triggered Z times, the encoder 2 configured for the conveyor belt 1 is started to count; the encoder 2 reads the current pulse value M; When the second pulse of the encoder reaches M+N, combined with the pulse number B of the second pulse of the conveyor belt calculated by encoder three, when the pulse number of encoder three reaches A+B, the signal is delayed to the execution position of the kicking mechanism.

[0014] Furthermore, the visual inspection system includes a front inspection camera and a back inspection camera, which are respectively used to inspect the quality of the front and back of the printed matter.

[0015] Furthermore, it also includes a storage module connected to the three-stage delay control module for storing parameters, and the storage module has parameter updating and adjustment functions.

[0016] Furthermore, the waste kicking mechanism includes any one of a robotic arm, a pneumatic push rod or an electromagnetic suction cup.

[0017] Furthermore, it also includes a speed monitoring module for monitoring the transmission speed of printed matter on the conveyor belt in real time and feeding back the speed information to the three-level delay control module.

[0018] A second aspect of the present invention provides a method for controlling a waste ejection signal of a web printing press, comprising: The visual inspection system is used to monitor the quality of printed products in real time. When defective products are detected, an NG signal is generated, and the marking module is triggered to mark the defective products. At the same time, the encoder collects the initial pulse value X when the marking is triggered. First-level delay processing: Calculate the target position (X+Y) of the front end of the paper guide roller according to the preset pulse delay value Y. When the accumulated pulse of the encoder reaches X+Y, activate the paper guide roller blade sensor. Second-level delay processing: The blade sensor of the paper guide wheel counts the number of blade triggers Z. When the cumulative number of triggers reaches Z, the encoder 2 configured for the conveyor belt is started to count and read the current pulse value M. The third level of delay processing: Encoder 2 counts the number of pulses N corresponding to the length of conveyor belt 1. When the pulse of encoder 2 reaches M+N, encoder 3 reads the current pulse value A and counts the number of pulses B corresponding to the length of conveyor belt 2. When the pulse of encoder 3 reaches A+B, the kick signal is triggered; After receiving the waste kicking signal, the waste kicking mechanism executes the single waste rejection action.

[0019] Furthermore, the calculation formula of the preset pulse delay value Y is Y=L1 / R1, where L1 is the length of the paper transmission path from the kick mark position to the paper guide wheel, and R1 is the resolution of encoder 1 (number of pulses / unit length).

[0020] The fixed count Z is further calculated as Z=(θ / 360°)×N blades, where θ is the angle required for the paper guide wheel to rotate from the signal receiving position to place the waste on the conveyor belt, and N blades is the total number of blades of the paper guide wheel.

[0021] Furthermore, the calculation formula for the number of pulses N corresponding to the length of conveyor belt one is N=L2 / R2, where L2 is the length of conveyor belt one and R2 is the resolution of encoder two; the calculation formula for the number of pulses B corresponding to the length of conveyor belt two is B=L3 / R3, where L3 is the length of conveyor belt two and R3 is the resolution of encoder three.

[0022] Furthermore, when the visual inspection system detects waste and generates an NG signal, encoder 1 records the current pulse value X and calculates the target position X+Y; when the pulse of encoder 1 reaches X+Y, it triggers the paper guide wheel blade sensor to start counting Z times; after the blade sensor is triggered Z times, encoder 2 starts counting and reads the initial pulse value M, and when the pulse reaches M+N, encoder 3 starts counting and reads the initial pulse value A; when encoder 3 counts to A+B, it determines the final triggering timing of the waste ejection signal; the waste ejection mechanism executes the waste rejection action according to the final triggering timing.

[0023] The present invention adopts the above technical solution, which has at least the following beneficial effects: During web offset printing, due to the high printing speed and automatic folding after printing, it is difficult for subsequent processes to conduct comprehensive surface quality inspections on the folded products, resulting in defective products easily entering the market. The present invention precisely delays the detection system's waste rejection signal to the conveyor belt position after folding and before stacking. During the high-speed printing process, waste products are accurately and in real time removed, achieving precise single-sheet waste rejection. This effectively prevents defective products from entering the market, greatly improving the overall quality of printed products and resolving quality issues caused by the inability to accurately reject waste in existing technologies.

[0024] Traditional scrap removal methods use spray marking, which consumes spray marking consumables and risks damaging the product. This invention eliminates spray marking, saving on spray marking consumables and avoiding damage to the product, thus reducing production costs while ensuring product quality.

[0025] Web printing runs at high speeds, and simply inspecting printed products without removing defective ones would render the visual inspection effect ineffective. This invention can promptly reject defective products based on the results of the online inspection system, effectively removing defective products detected by the visual inspection system. This truly maximizes the value of the visual inspection system, maximizing inspection efficiency and ensuring unique inspection results.

[0026] Different from other rejection logics, the present invention can achieve accurate single-sheet rejection, avoiding resource waste caused by misjudgment or inaccurate rejection, effectively reducing production costs and improving production efficiency.

[0027] The present invention realizes the accurate delay of the automatic kicking signal of the online detection system of the web offset printing press. Accurate delay control is the key to accurate kicking, ensuring that the kicking signal can be transmitted to the kicking mechanism at the appropriate time, providing a strong guarantee for the quality control of the entire printing production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of a waste ejection signal control mechanism for a web printing press according to the present invention; Figure 2 The present invention is a flow chart of a method for realizing a waste ejection signal control mechanism of a web printing press. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0031] Example 1 like Figure 1 As shown, this embodiment provides an encoder-based waste ejection signal control mechanism for a web printing press, comprising: Visual inspection system, used to detect the quality of printed products in real time and generate NG rejection signals; The marking module is provided at the position of the triangle plate and is used to mark the rejects in response to the NG rejection signal, and the marking signal is used as a zero position signal; Three-level delay control module, including: The first-stage delay unit uses encoder 1 to collect the initial pulse value X when the marking mark is triggered, and calculates the target position (X+Y) of the front end of the paper guide roller based on the preset pulse delay value Y, where Y is the distance from the kick mark position to the front end of the paper guide roller divided by the pulse resolution of encoder 1 to obtain the number of pulses; The second-stage delay unit counts the number of blade triggering times Z through the paper guide wheel blade sensor and delays the signal to the front end of the conveyor belt. The third-level delay unit calculates the number of pulses N corresponding to the length of conveyor belt 1 and the number of pulses B corresponding to the length of conveyor belt 2 through encoder 2 and encoder 3, respectively, and finally delays the signal to the execution position of the waste kicking mechanism. Encoder 2 reads the current pulse value M after the blade sensor is triggered Z times. N is the number of pulses obtained by dividing the length of conveyor belt 1 by the pulse resolution of encoder 2. Encoder 3 reads the current pulse value A when the encoder 2 pulse reaches M+N. B is the number of pulses obtained by dividing the length of conveyor belt 2 by the pulse resolution of encoder 3. The waste kicking mechanism is arranged at the waste kicking position and is used to perform a single waste product removal action according to the signal output by the third-level delay unit.

[0032] As an implementation method, in this embodiment, a visual inspection station, a paper guide wheel device and a conveyor belt system are sequentially arranged along the paper transmission direction.

[0033] As an implementation mode, the visual inspection system described in this embodiment is arranged at a visual inspection station, and an encoder 1 synchronized with the printing roller is provided at the station; the encoder 1 is used to record the current pulse value X when receiving the NG signal of the visual inspection system, and activate the guide wheel blade counting when the accumulated pulse of the encoder 1 reaches X+Y, where Y is a pulse delay value preset based on the paper path length from the inspection station to the guide wheel and the resolution of the encoder 1.

[0034] As an implementation mode, the rotating shaft of the paper guide roller device described in this embodiment is equipped with a blade sensor for fixedly counting the number of blade triggering times Z to realize the function of signal delay to the front end of conveyor belt 1; the number of blades of the paper guide roller is fixed and evenly distributed, and the fixed count Z is determined according to the number of blade triggering sensors required for the paper guide roller to rotate a fixed angle to place the product on conveyor belt 1.

[0035] As an implementation mode, the conveyor belt system described in this embodiment includes conveyor belt 1 and conveyor belt 2 arranged in sequence along the paper transmission direction; conveyor belt 1 is configured with encoder 2, and encoder 2 is used to calculate the number of pulses N corresponding to the length of conveyor belt 1; conveyor belt 2 is configured with encoder 3, and encoder 3 is used to calculate the number of pulses B corresponding to the length of conveyor belt 2.

[0036] As an implementation method, after the blade sensor of the paper guide roller device described in this embodiment is triggered Z times, the encoder 2 configured for the conveyor belt 1 is started to count, and the encoder 2 reads the current pulse value M; when the pulse of the encoder 2 reaches M+N, the encoder 3 reads the current pulse value A, combined with the number of pulses B of the conveyor belt 2 calculated by the encoder 3, when the pulse number of the encoder 3 reaches A+B, the signal is jointly delayed to the execution position of the kicking mechanism.

[0037] As an implementation manner, the visual inspection system described in this embodiment includes a front inspection camera and a back inspection camera, which are respectively used to inspect the quality of the front and back sides of printed matter.

[0038] As an implementation manner, this embodiment further includes a storage module connected to the three-stage delay control module for storing parameters, and the storage module has parameter updating and adjustment functions.

[0039] Furthermore, the waste kicking mechanism includes any one of a robotic arm, a pneumatic push rod or an electromagnetic suction cup.

[0040] Furthermore, it also includes a speed monitoring module for real-time monitoring of the transmission speed of printed matter on the conveyor belt, and feeding back the speed information to the three-level delay control module, and the three-level delay control module dynamically adjusts the pulse delay value according to the transmission speed.

[0041] In actual operation, when the visual inspection system detects a defect in a printed product and generates an NG ejection signal, the inkjet marking module marks the defective product at the set square position, and Encoder 1 records the current pulse value X. The first-stage delay unit delays the product according to a preset Y value (Y = the distance from the ejection mark to the front of the guide roller / Encoder 1's pulse resolution). When Encoder 1's pulse value reaches X + Y, the guide roller blade sensor begins counting. The blade sensor triggers once every fixed rotation of the guide roller. After a cumulative Z triggering times, Encoder 2 begins counting and reads the current pulse value M. Encoder 2 calculates the number of pulses N based on the length of Conveyor Belt 1 (N = Conveyor Belt 1 length / Encoder 2's pulse resolution). When Encoder 2's pulse value reaches M + N, Encoder 3 begins counting and reads the current pulse value A. Encoder 3 calculates the number of pulses B based on the length of Conveyor Belt 2 (B = Conveyor Belt 2 length / Encoder 3's pulse resolution). When Encoder 3's pulse value reaches A + B, the ejection signal is accurately transmitted to the ejection mechanism, which then ejects the single defective sheet.

[0042] At the same time, the storage module can store relevant parameters for easy subsequent query and adjustment; the speed monitoring module monitors the speed in real time, allowing the entire system to dynamically adjust according to changes in printing speed, ensuring that the waste removal task can be accurately completed under different printing conditions.

[0043] Example 2 like Figure 2 As shown, the second aspect of the present invention provides a method for controlling a waste ejection signal of a web printing press, comprising: The visual inspection system is used to monitor the quality of printed products in real time. When defective products are detected, an NG signal is generated, and the marking module is triggered to mark the defective products. At the same time, the encoder collects the initial pulse value X when the marking is triggered. First-level delay processing: Calculate the target position (X+Y) of the front end of the paper guide roller according to the preset pulse delay value Y. When the accumulated pulse of the encoder reaches X+Y, activate the paper guide roller blade sensor. Second-level delay processing: The blade sensor of the paper guide wheel counts the number of blade triggers Z. When the cumulative number of triggers reaches Z, the encoder 2 configured for the conveyor belt is started to count and read the current pulse value M. The third level of delay processing: Encoder 2 counts the number of pulses N corresponding to the length of conveyor belt 1. When the pulse of encoder 2 reaches M+N, encoder 3 reads the current pulse value A and counts the number of pulses B corresponding to the length of conveyor belt 2. When the pulse of encoder 3 reaches A+B, the kick signal is triggered; After receiving the waste kicking signal, the waste kicking mechanism executes the single waste rejection action.

[0044] Furthermore, the calculation formula of the preset pulse delay value Y is Y=L1 / R1, where L1 is the length of the paper transmission path from the kick mark position to the paper guide wheel, and R1 is the resolution of encoder 1 (number of pulses / unit length).

[0045] The fixed count Z is further calculated as Z=(θ / 360°)×N blades, where θ is the angle required for the paper guide wheel to rotate from the signal receiving position to place the waste on the conveyor belt, and N blades is the total number of blades of the paper guide wheel.

[0046] Furthermore, the calculation formula for the number of pulses N corresponding to the length of conveyor belt one is N=L2 / R2, where L2 is the length of conveyor belt one and R2 is the resolution of encoder two; the calculation formula for the number of pulses B corresponding to the length of conveyor belt two is B=L3 / R3, where L3 is the length of conveyor belt two and R3 is the resolution of encoder three.

[0047] Furthermore, when the visual inspection system detects waste and generates an NG signal, encoder 1 records the current pulse value X and calculates the target position X+Y; when the pulse of encoder 1 reaches X+Y, it triggers the paper guide wheel blade sensor to start counting Z times; after the blade sensor is triggered Z times, encoder 2 starts counting and reads the initial pulse value M, and when the pulse reaches M+N, encoder 3 starts counting and reads the initial pulse value A; when encoder 3 counts to A+B, it determines the final triggering timing of the waste ejection signal; the waste ejection mechanism executes the waste rejection action according to the final triggering timing.

[0048] Example 3 This embodiment provides a method for controlling a waste ejection signal of a web printing press, wherein the control structure adopted includes: The visual inspection system is installed at the visual inspection station and includes a front inspection camera and a back inspection camera, which are used to detect the quality of printed products in real time and generate NG rejection signals; the station is equipped with an encoder that is synchronized with the printing roller.

[0049] The marking module is arranged at the position of the triangle plate and is used to mark the waste products in response to the NG waste signal.

[0050] Three-level delay control module, including: The first-level delay unit: collects the initial pulse value X when the marking is triggered through encoder 1, and calculates the target position (X+Y) of the front end of the paper guide wheel based on the preset pulse delay value Y. Among them: X: When the spray mark is triggered, the encoder's current accumulated pulse value (corresponding to the position of the scrap at the detection station).

[0051] Y: The number of pulses corresponding to the distance from the kick mark position to the front end of the paper guide roller. The calculation formula is: Y=L1 / R1, where L1 is the length of the paper transmission path from the kick mark position to the paper guide roller, and R1 is the resolution of encoder 1 (number of pulses / unit length).

[0052] The second-stage delay unit: The blade sensor of the paper guide wheel counts the number of blade triggers Z and delays the signal to the front end of the conveyor belt. Z: The number of blade triggers required for the paper guide wheel to rotate from the signal receiving position to place the waste on the conveyor belt. The calculation formula is: Z=(θ / 360)×K, where θ is the rotation angle of the paper guide wheel and K is the total number of blades on the paper guide wheel.

[0053] The third-level delay unit: uses encoder 2 and encoder 3 to calculate the number of pulses N corresponding to the length of conveyor belt 1 and the number of pulses B corresponding to the length of conveyor belt 2, and finally delays the signal to the execution position of the waste kicking mechanism. N: The number of pulses corresponding to the length of conveyor belt 1 from the starting end to the connection with conveyor belt 2. The calculation formula is: N=L2 / R2, where L2 is the length of conveyor belt 1 and R2 is the resolution of encoder 2.

[0054] B: The number of pulses corresponding to the length of conveyor belt 2 from the connection point with conveyor belt 1 to the position of the waste kicking mechanism. The calculation formula is: B=L3 / R3, where L3 is the length of conveyor belt 2 and R3 is the resolution of encoder 3.

[0055] M: The initial pulse value of encoder 2 when it starts counting after the blade sensor is triggered Z times (usually 0 or a preset offset value).

[0056] A: The initial pulse value (usually 0 or a preset offset value) of encoder three when encoder two pulses start counting when they reach M+N.

[0057] The waste kicking mechanism is arranged at the waste kicking position and is used to perform a single waste product removal action according to the signal output by the third-level delay unit.

[0058] The storage module is connected to the three-stage delay control module and is used to store parameters such as the pulse delay values ​​Y, N, B and the fixed count Z, and the storage module has parameter updating and adjustment functions.

[0059] The speed monitoring module is used to monitor the transmission speed of the printed matter on the conveyor belt in real time and feed the speed information back to the three-level delay control module. The three-level delay control module dynamically adjusts the pulse delay value according to the transmission speed.

[0060] Parameter Description Summary

[0061] Supplementary instructions for the workflow When the vision inspection system detects a defective product and generates an NG signal: Encoder 1 records the current pulse value X and calculates the target position X+Y; When a pulse of the encoder reaches X+Y, the paper guide wheel blade sensor is triggered to start counting Z times; After the blade sensor is triggered Z times, encoder 2 starts counting and reads the initial pulse value M. When the pulse reaches M+N, encoder 3 starts counting and reads the initial pulse value A. When the encoder counts to A+B, the final triggering time of the kick signal is determined; The waste ejection mechanism performs waste removal action according to the final triggering timing.

[0062] Through this three-level delay control, accurate signal transmission is achieved from the detection station to the waste removal position, ensuring that the waste is removed at the correct position.

[0063] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An encoder-based waste ejection signal control mechanism for a web printing press, characterized in that: include: Visual inspection system, used to detect the quality of printed products in real time and generate NG rejection signals; The marking module is located at the position of the triangle plate and is used to mark the waste products in response to the NG signal; Three-level delay control module, including: The first-level delay unit collects the initial pulse value X when the marking mark is triggered through the encoder, and calculates the target position (X+Y) of the front end of the guide roller based on the preset pulse delay value Y. The second-stage delay unit counts the number of blade triggering times Z through the paper guide wheel blade sensor and delays the signal to the front end of the conveyor belt. The third-level delay unit calculates the number of pulses N corresponding to the length of conveyor belt 1 and the number of pulses B corresponding to the length of conveyor belt 2 through encoder 2 and encoder 3, and finally delays the signal to the execution position of the kicking mechanism; The waste kicking mechanism is arranged at the waste kicking position and is used to perform a single waste product removal action according to the signal output by the third-level delay unit.

2. The encoder-based waste ejection signal control mechanism for a web-fed printing press according to claim 1, characterized in that: A visual inspection station, a paper guide wheel device and a conveyor belt system are sequentially arranged along the paper transmission direction; the visual inspection system is arranged at the visual inspection station, and an encoder 1 synchronized with the printing cylinder is provided at the station; The encoder 1 is used to record the current pulse value X when receiving the NG signal of the visual inspection system, and activates the paper guide wheel blade counting when the accumulated pulses of the encoder 1 reach X+Y.

3. The encoder-based waste ejection signal control mechanism for a web printing press according to claim 2, characterized in that: The rotating shaft of the paper guide roller device is equipped with a blade sensor for counting the number of blade triggering times Z to achieve the function of delaying the signal to the front end of the conveyor belt; The number of blades of the paper guide wheel is fixed and evenly distributed, and the fixed count Z is determined according to the number of times the blade triggers the sensor required for the paper guide wheel to rotate a fixed angle to place the product on the conveyor belt.

4. The encoder-based waste ejection signal control mechanism for a web printing press according to claim 3, characterized in that: The conveyor belt system comprises a conveyor belt 1 and a conveyor belt 2 which are sequentially arranged along the paper transmission direction; The conveyor belt 1 is equipped with an encoder 2, which is used to calculate the number of pulses N corresponding to the length of the conveyor belt 1; the conveyor belt 2 is equipped with an encoder 3, which is used to calculate the number of pulses B corresponding to the length of the conveyor belt 2; After the blade sensor of the paper guide wheel device is triggered Z times, the encoder 2 configured for the conveyor belt 1 is started to count; the encoder 2 reads the current pulse value M; When the second pulse of the encoder reaches M+N, combined with the pulse number B of the second pulse of the conveyor belt calculated by encoder three, when the pulse number of encoder three reaches A+B, the signal is delayed to the execution position of the kicking mechanism.

5. A method for controlling a waste ejection signal of a web printing press based on the control mechanism according to any one of claims 1 to 4, characterized in that: include: The visual inspection system is used to monitor the quality of printed products in real time. When defective products are detected, an NG signal is generated, and the marking module is triggered to mark the defective products. At the same time, the encoder collects the initial pulse value X when the marking is triggered. First-level delay processing: Calculate the target position (X+Y) of the front end of the paper guide roller according to the preset pulse delay value Y. When the accumulated pulse of the encoder reaches X+Y, activate the paper guide roller blade sensor. Second-level delay processing: The blade sensor of the paper guide wheel counts the number of blade triggers Z. When the cumulative number of triggers reaches Z, the encoder 2 configured for the conveyor belt is started to count and read the current pulse value M. The third level of delay processing: Encoder 2 counts the number of pulses N corresponding to the length of conveyor belt 1. When the pulse of encoder 2 reaches M+N, encoder 3 reads the current pulse value A and counts the number of pulses B corresponding to the length of conveyor belt 2. When the pulse of encoder 3 reaches A+B, the kick signal is triggered; After receiving the waste kicking signal, the waste kicking mechanism executes the single waste rejection action.

6. The method for controlling the ejection signal of a web printing press according to claim 5, characterized in that: The calculation formula of the preset pulse delay value Y is Y=L1 / R1, where L1 is the length of the paper transmission path from the kick mark position to the paper guide wheel, and R1 is the resolution of encoder 1 (number of pulses / unit length).

7. The method for controlling the ejection signal of a web printing press according to claim 5, characterized in that: The calculation formula for the fixed count Z is Z=(θ / 360°)×N blades, where θ is the angle required for the paper guide wheel to rotate from the signal receiving position to place the waste on the conveyor belt, and N blades is the total number of blades of the paper guide wheel.

8. The method for controlling the ejection signal of a web printing press according to claim 5, characterized in that: The calculation formula for the number of pulses N corresponding to the length of conveyor belt one is N=L2 / R2, where L2 is the length of conveyor belt one and R2 is the resolution of encoder two; the calculation formula for the number of pulses B corresponding to the length of conveyor belt two is B=L3 / R3, where L3 is the length of conveyor belt two and R3 is the resolution of encoder three.

9. The method for controlling the ejection signal of a web printing press according to claim 8, characterized in that: When the visual inspection system detects a defective product and generates an NG signal, encoder 1 records the current pulse value X and calculates the target position X+Y. When the encoder 1 pulse reaches X+Y, it triggers the paper guide wheel blade sensor to start counting Z times. After the blade sensor is triggered Z times, encoder 2 starts counting and reads the initial pulse value M. When the pulse reaches M+N, encoder 3 starts counting and reads the initial pulse value A. When encoder 3 counts to A+B, the final triggering time of the rejection signal is determined. The waste ejection mechanism performs waste removal action according to the final triggering timing.

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