Automatic correction system and method for paper feed time of a paper feeder

Abstract

The application discloses a kind of automatic correction system and method of paper feeder paper feeding time, the automatic correction system includes detection mechanism, for detecting the paper feeding time of paper feeder, detection mechanism includes first encoder and position detection module, when position detection module is inductive switch, inductive switch triggers signal, first encoder will detect current angle value, when position detection module is second encoder, real-time detection and calculate the angle difference of the position of first encoder and second encoder;Logic controller is used to obtain current angle value and calculate the angle difference of correct standard angle value with paper feeding time or the angle difference of the position of first encoder and second encoder, and obtains paper feeding time result according to angle difference;Servo controller is used to set the paper feeding speed of paper feeder based on paper feeding time result, so that paper feeder corrects paper feeding time according to newly set paper feeding speed;The present application can solve the technical problems of reducing production efficiency due to paper feeding time error in the prior art.

Description

Technical Field

[0001] This invention relates to the field of printing technology, and more specifically to an automatic paper feeding time correction system and method for a paper feeder. Background Technology

[0002] In today's society, printing has long been an important part of our daily lives. The invention and development of the printing press has played a vital role in the dissemination of human civilization and culture. A printing press is a machine that prints text and images. Generally, the text and images to be printed are made into a printing plate, which is then mounted on the printing press. Ink is then applied to the areas of the printing plate containing the text and images, either manually or by the printing press itself. The ink is then transferred directly or indirectly to paper or other printing substrates, thereby reproducing a printed product identical to the printing plate.

[0003] The most common type of printing press is the sheetfed printing press. Sheetfed printing presses require a paper feeder to supply paper. However, the paper feeder can only detect paper skew and arrival time at the front guide. If the paper arrival time is incorrect, the sheetfed printing press will malfunction and stop production. At the same time, it is necessary to manually check, confirm and correct before resuming production, which consumes a lot of time and reduces production efficiency.

[0004] Therefore, existing sheet-fed printing presses generally suffer from technical problems such as malfunctions caused by incorrect paper feeding time, which reduces printing efficiency. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide an automatic correction system and method for paper feeding time of a paper feeder, which aims to solve the technical problem of reduced production efficiency due to paper feeding time errors in the prior art.

[0006] One aspect of the present invention is to provide an automatic correction system for paper feeder feeding time, used for correcting the paper feeder feeding time of a sheet-fed printing press, the automatic correction system comprising:

[0007] A detection mechanism is used to detect the paper feeding time of the paper feeder. The detection mechanism includes a first encoder mounted on the concentric shaft of the paper feed roller and a position detection module mounted on the paper feeder. The position detection module is either a sensor switch or a second encoder.

[0008] When the position detection module is a sensor switch, and the sensor switch triggers a signal, the first encoder will detect the current angle value of the paper feed roller.

[0009] When the position detection module is the second encoder, it will detect and calculate the angle difference between the positions of the first encoder and the second encoder in real time.

[0010] a logic controller configured to acquire the current angle value and calculate an angle difference between the current angle value and a standard angle value corresponding to a correct paper feeding time of the printing machine or an angle difference between the first encoder and the second encoder, and acquire a paper feeding time result of the paper feeder according to the angle difference;

[0011] a servo controller configured to acquire the paper feeding time result of the paper feeder, set a paper feeding speed of the paper feeder based on the paper feeding time result of the paper feeder, and correct the paper feeding time of the paper feeder according to the newly set paper feeding speed.

[0012] Compared with the prior art, the automatic correction system for the paper feeding time of the paper feeder has the following beneficial effects: the paper feeder does not need to wait for the paper to reach the front gauge for detection, even if the paper feeding error is detected at the front gauge, the correction can only be performed by stopping the machine for detection. Specifically, when the position detection module is an inductive switch, the inductive switch triggers a signal, and the first encoder located on the concentric shaft of the paper feeding cylinder detects the current angle value of the paper feeding cylinder, calculates an angle difference between the current angle value and a standard angle value corresponding to a correct paper feeding time of the printing machine, and sets a paper feeding speed of the paper feeder according to the angle difference, and corrects the paper feeding time of the paper feeder according to the newly set paper feeding speed, so that the paper reaches the front gauge at the correct time. When the position detection module is a second encoder, the angle difference between the first encoder and the second encoder is calculated in real time, and the paper feeding speed of the paper feeder is set according to the angle difference, and the paper feeding time of the paper feeder is corrected according to the newly set paper feeding speed, so that the paper reaches the front gauge at the correct time, reduces unnecessary downtime of the printing machine due to paper feeding time errors, and improves production efficiency, thereby solving the technical problem of reducing production efficiency due to paper feeding time errors in the prior art. At the same time, only simple detection mechanisms, logic controllers and servo controllers are needed for mutual control and signal transmission, without the need for substantial modification of the printing machine, the structure is simple, the modification cost is low, time and cost are saved.

[0013] According to an aspect of the above technical solution, when the position detection module is an inductive switch, the inductive switch is provided with a transmission shaft on one side close to the first encoder, the transmission shaft is provided with a sensing element, the transmission shaft drives the sensing element to rotate, and the sensing element and the inductive switch are in mutual induction to trigger a signal of the inductive switch.

[0014] According to an aspect of the above technical solution, the printing machine is provided with a paper feeding cylinder, and the first encoder is arranged on the concentric shaft of the paper feeding cylinder. When the sensing element and the inductive switch are in mutual induction, the first encoder detects the current angle value of the paper feeding cylinder.

[0015] According to one aspect of the above technical solution, when the position detection module is the second encoder, the second encoder is set on the paper feeder drive shaft, the printing press is provided with a paper feed roller, and the first encoder is set on the concentric shaft of the paper feed roller. At this time, the paper feeding angle difference between the first encoder and the second encoder is detected in real time, and the system automatically corrects it after real-time calculation.

[0016] An automatic correction method for paper feeder feeding time, the method being applied to the automatic correction system for paper feeder feeding time according to any one of the above technical solutions, the method comprising:

[0017] When the position detection module is a sensor switch, the system receives a trigger signal from the position detection module and controls the first encoder to acquire the current angle value of the paper feed roller.

[0018] When the position detection module is the second encoder, it will detect and calculate the angle difference between the positions of the first encoder and the second encoder in real time.

[0019] Obtain the standard angle value for the correct paper feeding time of the printing press, and calculate the angle difference between the current angle value and the standard angle value based on the current angle value of the paper feed roller and the standard angle value for the correct paper feeding time of the printing press, or obtain the angle difference between the positions of the first encoder and the second encoder;

[0020] The angle difference is compared with a preset angle difference range. If the angle difference is not within the preset angle difference range, it is determined that the paper feeder has a paper feeding time error.

[0021] The paper feeder speed is set according to the angle difference so that the paper feeder corrects the paper feed time according to the newly set paper feed speed.

[0022] According to another aspect of the above technical solution, when the position detection module is a sensor switch, the step of receiving the trigger signal from the position detection module and controlling the first encoder to acquire the current angle value of the paper feed roller specifically includes:

[0023] When the position detection module is an inductive switch, the sensing element is driven to rotate through the transmission shaft. When the sensing element and the inductive switch sense each other, the trigger signal of the inductive switch is controlled.

[0024] By controlling the trigger signal of the inductive switch, the first encoder detects the current angle value of the paper feed roller.

[0025] According to another aspect of the above technical solution, the standard angle value of the printing machine paper feeding time is obtained, and according to the current angle value of the paper feeding roller and the standard angle value of the printing machine paper feeding time, the angle difference between the current angle value and the standard angle value is calculated, or the angle difference between the first encoder and the second encoder position is obtained, specifically including:

[0026] The standard angle value of the printing machine paper feeding time is obtained;

[0027] The logic controller calculates the angle difference between the current angle value of the paper feeding roller and the standard angle value of the printing machine paper feeding time;

[0028] Or the angle difference between the first encoder and the second encoder position is obtained.

[0029] According to another aspect of the above technical solution, the angle difference is compared with the preset angle difference interval, and when the angle difference does not satisfy the angle difference interval, it is determined that the paper feeder has a paper feeding time error, specifically including:

[0030] The logic controller compares the angle difference with the preset angle difference interval, and the preset angle difference interval is -10°-10°;

[0031] When the angle difference is greater than 10° or less than -10°, it is determined that the paper feeder has a paper feeding time error.

[0032] According to another aspect of the above technical solution, according to the angle difference, the paper feeding speed of the paper feeder is set, so that the paper feeder corrects the paper feeding time according to the newly set paper feeding speed, specifically including:

[0033] When the angle difference is greater than 10° or less than -10°, the servo controller sets the paper feeding speed of the paper feeder to slow down by 1% or speed up by 1%, so that the paper feeding speed of the paper feeder is slowed down by 1% or sped up by 1%, and the paper feeding time is corrected. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0035] Figure 1 The structure block diagram of the paper feeder paper feeding time automatic correction system in the first embodiment of the present application;

[0036] Figure 2 The structure schematic diagram of the detection mechanism in the first embodiment of the present application;

[0037] Figure 3Flow chart of automatic correction method for paper feeding time of paper feeder in third embodiment of the present application;

[0038] Explanation of symbols of components in drawings:

[0039] Printing machine main body 10, paper feeding cylinder 11, paper feeder 20, inductive switch 21, transmission shaft 22, first encoder 110, inductive element 220, detection mechanism 100, logic controller 200, servo controller 300. DETAILED DESCRIPTION

[0040] In order to make the objects, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. The present application is illustrated in several embodiments in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0041] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "linking", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0043] Please refer to Figures 1-2The automatic correction system for paper feeding time of the paper feeder is shown in the first embodiment of the application. The automatic correction system comprises a detection mechanism 100, a logic controller 200 and a servo controller 300. The detection mechanism 100 comprises a first encoder 110, a sensing switch 21 and a transmission shaft 22. The first encoder 110 is located on the axis of the paper feeding cylinder 11 of the printing machine and is used to detect the current angle value of the paper feeding cylinder 11. The printing machine comprises a printing machine main body 10 and a paper feeder 20. The printing machine main body 10 comprises at least one cylinder. The cylinder is provided with a paper feeding cylinder 11. The paper feeding cylinder 11 is in the shape of a cylinder and is used to convey paper to the printing machine. The relative position and movement speed of the paper feeding cylinder 11 are consistent with those of the paper feeder 20. The current angle value of the paper feeding cylinder 11 is equivalent to the paper feeding time of the paper feeder 20. Therefore, the current angle value of the paper feeding cylinder 11 detected by the first encoder 110 is the paper feeding time of the paper feeder 20.

[0044] Further, the paper feeder 20 is provided with a sensing switch 21. The sensing switch 21 triggers a signal by contact sensing. The sensing switch 21 is provided with a transmission shaft 22 on the side close to the first encoder 110. The transmission shaft 22 is in the shape of a cylinder and is used to transmit power to the paper feeder 20. The outer circle of the transmission shaft 22 is provided with a cuboid sensing part 220. The rotation of the transmission shaft 22 drives the rotation of the sensing part 220. When the sensing part 220 and the sensing switch 21 are in contact with each other, the sensing switch 21 triggers a signal. The sensing switch 21 emits a signal to the first encoder 110. The first encoder 110 detects the current angle value of the paper feeding cylinder 11.

[0045] The logic controller 200 comprises a programmable logic controller (PLC). The programmable logic controller is a digital operation electronic system which can store instructions for performing logic operation, sequential control, timing, counting and arithmetic operation, etc. The logic controller 200 is used to obtain the current angle value of the paper feeding cylinder 11 detected by the first encoder 110 and the standard angle value of the printing machine paper feeding time. The logic controller 200 calculates the angle difference between the current angle value of the paper feeding cylinder 11 detected by the first encoder 110 and the standard angle value of the printing machine. The standard angle value of the printing machine paper feeding time is the angle value of the printing machine when the paper feeder 20 feeds the paper to the front gauge position of the printing machine. The angle value also represents the standard carriage time, i.e. the reference point time of the cooperation of all the cylinder times.

[0046] Furthermore, when the drive shaft 22 rotates circumferentially to drive the sensor 220 to rotate, when the sensor 220 and the induction switch 21 make contact with each other, the induction switch 21 triggers a signal and sends a signal to the first encoder 110. The first encoder 110 detects the current angle value of the paper feed roller 11. The logic controller 200 receives the current angle value and calculates the angle difference between the current angle value and the standard angle value through logical operations. The angle difference is used to determine whether there is an error in the paper feeding time of the paper feeder 20. Based on the angle difference, it is determined whether the paper feeding time of the paper feeder 20 is ahead or behind. Then, the logic controller 200 sends the paper feeding time result of the paper feeder 20 to the servo controller 300.

[0047] Simultaneously, the servo controller 300 receives the paper feeding time result from the paper feeder 20. The servo controller 300 controls the speed variation of the paper feeder 20. When the servo controller 300 receives the paper feeding time result from the paper feeder 20—whether the paper feeding time is ahead or behind—it adjusts the original speed of the paper feeder 20 accordingly, either by decelerating or accelerating, thus correcting the original speed so that the paper feeder 20 operates and transmits paper according to the newly set speed. This ensures that the paper feeding time of the paper feeder 20 always meets the reasonable range of the printing process, arriving at the front guide of the printing press at the correct time. Machine malfunctions due to incorrect paper feeding time are prevented, reducing downtime and improving production printing efficiency. Furthermore, only a simple detection mechanism 100, logic controller 200, and servo controller 300 are needed for mutual control and signal transmission; no major modifications to the printing press are required, resulting in a simple structure, low modification costs, and savings in time and money.

[0048] Compared to existing technologies, the automatic paper feeding time correction system provided in this embodiment offers the following advantages: It eliminates the need to wait for the paper to reach the front guide for detection. Even if a feeding error is detected at the front guide, correction is impossible, requiring a machine stop for inspection. Specifically, a sensor switch triggers a signal, and an encoder located on the concentric shaft of the feed roller detects the current angle value of the feed roller. This current angle value is compared with the standard angle value for correct paper feeding time on the printing press, and the angle difference is calculated. The paper feeding speed of the feeder is then set based on this difference, and the feeding time is corrected according to the newly set speed. This ensures the paper reaches the front guide at the correct time, reducing unnecessary downtime caused by feeding time errors and improving production efficiency. This solves the technical problem of reduced production efficiency due to feeding time errors in existing technologies. Furthermore, it requires only a simple detection mechanism, logic controller, and servo controller for mutual control and signal transmission, eliminating the need for significant modifications to the printing press. The structure is simple, the modification cost is low, and it saves time and money.

[0049] Further, the application also provides a second embodiment, compared with the first embodiment, the position detection module is a second encoder (not marked) arranged on the transmission shaft of the paper feeder, when the position detection module is the second encoder, the position angle difference between the first encoder and the second encoder is detected and calculated in real time. Since, when two encoders are used, the position angle difference between the first encoder and the second encoder is real-time, as long as the angle difference is not in the preset angle difference interval, it is immediately corrected, if the first encoder + inductive switch mode is used, the paper feeding error can only be judged at the moment when the inductive switch triggers, and then corrected. Therefore, by using the embodiment, the control is more accurate, that is, the installation of components can be reduced, thereby improving the stability of detection.

[0050] Please refer to Figure 3 , which is a paper feeding time automatic correction method provided by the third embodiment of the application. The method comprises the paper feeding time automatic correction system in the first embodiment, and comprises the following steps:

[0051] In step S10, when the position detection module is an inductive switch, the trigger signal of the position detection module is received, the current angle value of the paper feeding roller is acquired by the first encoder,

[0052] When the position detection module is a second encoder, the position angle difference between the first encoder and the second encoder is detected and calculated in real time.

[0053] When the position detection module is the inductive switch 21, the printing machine starts to work, the transmission shaft 22 of the paper feeder 20 transmits power to the paper feeder 20, and the paper is conveyed to the printing machine for printing. The inductive part 220 on the transmission shaft 22 rotates with the transmission shaft 22, when the transmission shaft 22 drives the inductive part 220 to rotate circumferentially until the inductive switch 21 is inductively contacted, which means the end of a rotation period of the transmission shaft 22. When the inductive part 220 is inductively contacted with the inductive switch 21, the inductive switch 21 triggers a signal, and transmits the signal to the first encoder 110, and the first encoder 110 receives the signal, and detects the current angle value of the paper feeding roller 11. Wherein, the relative position and movement speed of the paper feeding roller 11 are consistent with the paper feeder 20, so that detecting the current angle value of the paper feeding roller 11 is equivalent to detecting the paper feeding time of the paper feeder 20;

[0054] When the position detection module is a second encoder, the position angle difference between the first encoder 110 and the second encoder is detected and calculated in real time.

[0055] S11, obtaining a standard angle value of the printing machine paper feeding time, calculating an angle difference between the current angle value and the standard angle value according to the current angle value of the paper feeding cylinder and the standard angle value of the printing machine paper feeding time, or obtaining an angle difference between the first encoder and the second encoder positions;

[0056] It can be understood that the standard angle value of the printing machine paper feeding time is the angle value of the printing machine when the paper feeder 20 feeds the paper to the position of the front gauge of the printing machine. The logic controller 200 receives the current position angle value and the standard angle value, and calculates the angle difference between the two through the logic of the logic controller 200.

[0057] When the position detection module is the second encoder, the angle difference between the first encoder 110 and the second encoder is real-time. As long as the subsequent detected angle difference is not in the preset angle difference interval, the paper feeder 20 is immediately corrected.

[0058] S12, comparing the angle difference with a preset angle difference interval, and determining that the paper feeder has a paper feeding time error when the angle difference is not in the angle difference interval;

[0059] The logic controller 200 compares the calculated angle difference with the preset angle difference interval. Through experimental verification, the preset angle difference interval is -10°-10°. The paper arrival time is correct, that is, the angle difference that the printing machine reaches the fault tolerance. If the angle difference is in the preset angle difference interval, it means that the current angle value matches the standard angle value, that is, the paper feeding time of the paper feeder 20 meets the reasonable range of the printing process, and no feedback signal is needed to the servo controller 300. If the angle difference is greater than 10°, that is, the current angle value of the paper feeding cylinder 11 is greater than the standard angle value, that is, the running speed of the paper feeding cylinder 11 is greater than the running speed of the main machine of the printing machine, which means that the paper feeding time of the paper feeder 20 is ahead of schedule, and it is determined that the paper feeder 20 has a paper feeding time error. The logic controller 200 feeds the result of the paper feeding time error and the advance to the servo controller 300. If the angle difference is less than -10°, that is, the current angle value of the paper feeding cylinder 11 is less than the standard angle value, that is, the running speed of the paper feeding cylinder 11 is less than the running speed of the main machine of the printing machine, which means that the paper feeding time of the paper feeder 20 is lagging behind, and it is determined that the paper feeder 20 has a paper feeding time error. The logic controller 200 feeds the result of the paper feeding time error and the lag to the servo controller 300.

[0060] S13, setting the paper feeding speed of the paper feeder according to the angle difference, so that the paper feeder corrects the paper feeding time according to the newly set paper feeding speed.

[0061] It can be understood that the servo controller 300 receives the result of the paper feeding time error, i.e. the result of the paper feeder 20 feeding time being ahead or lagging, to set the deceleration or acceleration process of the paper feeding speed of the paper feeder 20. Specifically, if the paper feeding time of the paper feeder 20 is ahead, the servo controller 300 will set the current paper feeding speed of the paper feeder 20 to slow down by 1% of the speed, correct the original speed of the paper feeder 20, until the corrected deviation angle value reaches the preset angle difference interval. If the paper feeding time of the paper feeder 20 is lagging, the servo controller 300 will set the current paper feeding speed of the paper feeder 20 to speed up by 1% of the speed, correct the original speed of the paper feeder 20, until the corrected deviation angle value reaches the preset angle difference interval.

[0062] In summary, the automatic correction method of the paper feeding time of the paper feeder in the above-mentioned embodiments of the present application compares the current angle value with the standard angle value through the encoder to determine whether the paper feeding time is incorrect, and then sets the paper feeding speed of the paper feeder through the servo controller to correct the paper feeding time of the paper feeder, so that the paper feeding time always meets the reasonable range of the printing process. This method is simple and fast, and automatically tracks and corrects the paper feeding time of the paper feeder. It effectively reduces the downtime of the printing machine caused by paper feeding time errors, improves production efficiency, and has high economic benefits. At the same time, this method can be applied to all sheet-fed printing machines and has wide application.

[0063] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above-described embodiments only express several implementation manners of the present application, which are described in detail and specifically, but should not be understood as limitations to the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. An automatic correction system for paper feeder feeding time, used for correcting the paper feeder feeding time of a sheet-fed printing press, characterized in that, The automatic correction system includes: A detection mechanism is used to detect the paper feeding time of the paper feeder. The detection mechanism includes a first encoder mounted on the concentric shaft of the paper feed roller and a position detection module mounted on the paper feeder. The position detection module is either a sensor switch or a second encoder. When the position detection module is an inductive switch, a drive shaft is provided on the side of the inductive switch near the first encoder. A sensor is provided on the drive shaft. The drive shaft drives the sensor to rotate. When the sensor and the inductive switch sense each other, the inductive switch is triggered. When the inductive switch is triggered, the first encoder will detect the current angle value of the paper feed roller. When the position detection module is the second encoder, the second encoder is set on the drive shaft of the paper feeder. The printing press is equipped with a paper feed roller. The first encoder is set on the concentric shaft of the paper feed roller. At this time, the paper feeding angle difference between the first encoder and the second encoder is detected in real time, and the system is automatically corrected after real-time calculation. A logic controller is used to acquire the current angle value and calculate the angle difference with the standard angle value that is correct for the paper feeding time of the printing press or the angle difference between the positions of the first encoder and the second encoder, and to acquire the paper feeding time result of the paper feeder based on the angle difference. A servo controller is configured to acquire the paper feeding time result of the paper feeder, and set the paper feeding speed of the paper feeder based on the paper feeding time result, so that the paper feeder corrects the paper feeding time according to the newly set paper feeding speed, including: The angle difference is compared with a preset angle difference range. If the angle difference is not within the preset range, it is determined that the paper feeder has a paper feeding time error. The paper feeding speed of the paper feeder is set according to the angle difference, so that the paper feeder corrects the paper feeding time according to the newly set paper feeding speed; The printing press is equipped with a paper feed roller, and the first encoder is located on the concentric shaft of the paper feed roller. When the sensor and the inductive switch sense each other, the first encoder detects the current angle value of the paper feed roller.

2. An automatic correction method for paper feeding time of a paper feeder, characterized in that, The method is applied to the automatic correction system for the paper feeding time of the paper feeder according to claim 1, and the method includes: When the position detection module is a sensor switch, the system receives a trigger signal from the position detection module and controls the first encoder to acquire the current angle value of the paper feed roller. When the position detection module is the second encoder, it will detect and calculate the angle difference between the positions of the first encoder and the second encoder in real time. Obtain the standard angle value for the correct paper feeding time of the printing press, and calculate the angle difference between the current angle value and the standard angle value based on the current angle value of the paper feed roller and the standard angle value for the correct paper feeding time of the printing press, or obtain the angle difference between the positions of the first encoder and the second encoder; The angle difference is compared with a preset angle difference range. If the angle difference is not within the preset angle difference range, it is determined that the paper feeder has a paper feeding time error. The paper feeder speed is set according to the angle difference so that the paper feeder corrects the paper feed time according to the newly set paper feed speed.

3. The automatic correction method for paper feeding time of the paper feeder according to claim 2, characterized in that, When the position detection module is a sensor switch, the step of receiving the trigger signal from the position detection module and controlling the first encoder to acquire the current angle value of the paper feed roller specifically includes: When the position detection module is an inductive switch, the sensing element is driven to rotate through the transmission shaft. When the sensing element and the inductive switch sense each other, the trigger signal of the inductive switch is controlled. By controlling the trigger signal of the inductive switch, the first encoder detects the current angle value of the paper feed roller.

4. The automatic correction method for paper feeding time of the paper feeder according to claim 2, characterized in that, The steps of obtaining the standard angle value for the correct paper feeding time of the printing press, and calculating the angle difference between the current angle value and the standard angle value based on the current angle value of the paper feed roller and the standard angle value for the correct paper feeding time of the printing press, or obtaining the angle difference between the positions of the first encoder and the second encoder, specifically include: Obtain the correct standard angle value for the paper feeding time of the printing press; The logic controller calculates the angle difference between the current angle value of the paper feed roller and the standard angle value for correct paper feeding time of the printing press by acquiring the current angle value of the paper feed roller and the standard angle value for correct paper feeding time of the printing press. Alternatively, the angle difference between the positions of the first encoder and the second encoder can be obtained.

5. The automatic correction method for paper feeding time of the paper feeder according to claim 2, characterized in that, The step of comparing the angle difference with a preset angle difference range, and determining that the paper feeder has a paper feeding time error when the angle difference is not within the preset angle difference range, specifically includes: The logic controller compares the angle difference with a preset angle difference range, which is -10° to 10°. When the angle difference is greater than 10° or less than -10°, it is determined that the paper feeder has a paper feeding time error.

6. The automatic correction method for paper feeding time of the paper feeder according to claim 2, characterized in that, The step of setting the paper feeding speed of the paper feeder based on the angle difference and sending a correction command to the paper feeder so that the paper feeder corrects the paper feeding time according to the newly set paper feeding speed in the correction command specifically includes: If the angle difference is greater than 10° or less than -10°, the servo controller sets the paper feeder's paper feeding speed to decrease by 1% or increase by 1%, thereby correcting the paper feeding time.

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