A paper folding machine paper jam detection method

Abstract

The application discloses a paper jam detection method of a paper folding machine, sensors for detecting paper are arranged at the feeding end and the discharging end of the paper folding machine, and the detection method comprises the following steps: S1, calculating the feeding time T1 and the discharging time T2 of the paper according to the running speed of the paper folding machine and the length of the paper before and after folding; when the paper folding machine is running, the feeding time t1 and the discharging time t2 actually sensed by the sensors, if the difference between the actual time and the calculated time is within a set range, it is judged that the paper has been fed or discharged, otherwise, it is judged that it is an interference term; S2, judging whether the paper is jammed according to the time interval between feeding and discharging or calculating the maximum folding quantity X in the paper folding machine; the application realizes accurate judgment of the paper jam fault of the folding machine, guarantees the safety and stability of the folding machine in the production process, prolongs the service life of the folding machine, improves the economic benefits of products, reduces the fault time of the paper folding machine and reduces the production cost.

Description

Technical Field

[0001] This invention relates to the field of paper folding machine technology, and in particular to a method for detecting paper jams in paper folding machines. Background Technology

[0002] Fully automatic online high-speed folding machines are key equipment in pharmaceutical production lines. One automatic folding machine's production efficiency is equivalent to that of 10 skilled operators. It automatically switches specifications and folds, while also automatically counting at each workstation, greatly improving production efficiency and quality. The research and development of automatic folding machines will simultaneously promote research into key technologies such as high-speed pharmaceutical automated intelligent packaging control systems, precision machining technology, and materials science. This is of great significance for catching up with developed countries and improving the automation level of pharmaceutical safety production line inspections in my country. However, during the high-speed operation of the folding machine, paper jams can occur due to mechanical vibration, deterioration of paper quality, or other unstable factors. Paper jams can cause a large accumulation of paper in a short period. For example, at a speed of 400 sheets / minute, if a paper jam occurs, 20 instruction manuals will accumulate inside the folding machine within just 3 seconds, causing significant damage to the machine and production.

[0003] The existing technology for detecting paper jams, as described in the FOCKE350 packaging machine cigarette pack paper jam detection device with patent number CN213316284U, uses sensors to count paper. If the number of paper entering and leaving the machine is equal, it indicates no paper jam; otherwise, a paper jam occurs. However, in actual operation, this method of paper jam detection is easily affected by external interference. For example, the shadow cast by someone passing by the sensor can trigger the sensor to count. To address the interference in paper jam detection in existing methods, this invention provides a new technical solution. Summary of the Invention

[0004] The purpose of this invention is to provide a paper jam detection method for folding machines, which solves the problem that paper jam detection in existing technologies is easily affected by interference.

[0005] This invention is implemented as follows: a paper jam detection method for a paper folding machine, wherein the paper folding machine is equipped with sensors for detecting paper at both the feed and discharge ends, and the detection method includes the following steps:

[0006] S1. Calculate the feeding time T1 and discharging time T2 of the paper based on the running speed of the folding machine and the length of the paper before and after folding. When the folding machine is running, the actual feeding time t1 and discharging time t2 sensed by the sensor. If the difference between the actual time and the calculated time is within the set range, it is judged as feeding or discharging. Otherwise, it is judged as interference.

[0007] S2. Determine if there is a paper jam based on the time interval between feeding and discharging or by calculating the maximum number of folds X in the folding machine.

[0008] In practical applications, some interference factors can affect sensor detection. For example, when someone passes by, the sensor may respond, mistaking it for paper entering or exiting, which can easily cause false alarms for paper jams. In this invention, the paper feeding time and discharging time are first calculated. Then, the actual feeding and discharging times sensed by the sensor are compared with the calculated times. If the time difference is within the allowable range, the sensor is judged to have detected paper; otherwise, it is judged to be an interference signal. This ensures that the sensor detects paper and not other interference. When the signal at the feeding end is determined to be paper, the controller starts timing. When the paper is folded in the folding machine and output from the output end, the controller stops timing when the signal at the discharging end is determined to be paper. If the time difference between feeding and discharging is within the set range, it is judged to be normal operation. If the sensor at the discharging end has not detected paper discharging information after the set time, it is judged to be a paper jam.

[0009] Besides using time difference to determine if a paper jam has occurred, the number of sheets inside the folding machine can also be used to determine if a paper jam has occurred. Specifically, when the signal at the feed end indicates that the paper is being folded, the count is incremented by one. When the paper is output from the output end after being folded, the count is decremented by one. If the count is within a set range, the machine is considered to be operating normally. If the count is greater than the maximum number of folds (X) inside the folding machine, a paper jam is detected. This paper jam detection method uses the signal from the photoelectric sensor as a counting pulse to accurately calculate the actual number of folds.

[0010] This invention utilizes two photoelectric sensors for paper feeding and discharging detection. The PLC calculates the production speed of the folding machine and matches the scanning time of the photoelectric sensors. By detecting the feeding and discharging, it determines whether there is paper stuck inside the folding machine. This invention achieves accurate diagnosis of paper jam faults in the folding machine, ensuring the safety and stability of the folding machine during production, extending the service life of the folding machine, improving the economic efficiency of the product, reducing the downtime of the folding machine, and reducing production costs.

[0011] Paper jam detection methods need to be matched to different production speeds. Typically, folding machines operate at speeds of 200-400 sheets per minute. Therefore, the scanning time of the photoelectric sensors for feeding and discharging paper needs to be matched to the production speed of the folding machine; otherwise, false alarms or missed alarms will occur. In this invention, the scanning time of the photoelectric sensors for feeding and discharging paper can be controlled according to the production speed of the folding machine. If no paper is detected within its respective scanning time, an alarm signal is generated to stop the folding machine. This invention is adaptable to various production speeds of folding machines, eliminating the possibility of photoelectric sensor malfunctions caused by fixed scanning times, and ensuring the production safety and quality of the folding machine.

[0012] In this invention, the photoelectric sensor at the feeding end is used to detect whether paper enters the folding machine, and the photoelectric sensor at the discharging end is used to detect whether paper is conveyed to downstream equipment.

[0013] The PLC program uses an algorithm to calculate the scanning time of the photoelectric sensors at the feeding and discharging ends, as well as the time required to fold a sheet of paper, based on the production speed, the length of the paper before and after folding, and the folding method. During the folding process, if the photoelectric sensor at the feeding end scans the paper within the scanning time, it will wait for the trigger signal of the photoelectric sensor at the discharging end scanning the paper. If the waiting time exceeds the calculated folding time, it will determine that the folding machine is jammed and stop the folding machine.

[0014] A further technical solution of the present invention is as follows: In step S1, the calculation of feeding time T1 and discharging time T2 in the algorithm is as follows: feeding time T1 is equal to the length of the paper before folding divided by the running speed; discharging time T2 is equal to the length of the paper after folding divided by the running speed. Considering the interference of the sensor's own accuracy, the allowable error is Δt. Therefore, if the difference between the actual time and the calculated time is less than Δt, it is determined that the paper has been fed or discharged.

[0015] A further technical solution of the present invention is as follows: in step S1, the sensing time of the sensor at the feeding end is the feeding time t1, and the sensing time of the sensor at the discharging end is the discharging time t2. That is, when material passes through the sensor, the sensor's sensing signal will be triggered, the duration of the sensing signal at the feeding end is recorded as t1, and the duration of the sensing signal at the discharging end is recorded as t2.

[0016] A further technical solution of the present invention is as follows: In step S1, when the difference between the feeding time T1 and the feeding time t1 is within a set range, it is determined that feeding has occurred; when the difference between the discharging time T2 and the discharging time t2 is within a set range, it is determined that discharging has occurred. Theoretically, T1 = t1 is considered feeding, and T2 = t2 is considered discharging. Considering the accuracy error of the sensor in actual operation, an allowable error range Δt is set. Therefore, if the difference between T1 and t1 is within the range of Δt, it is considered that feeding has occurred; similarly, if the difference between T2 and t2 is within the error range, it is considered that discharging has occurred. This improves the accuracy of judgment and the anti-interference capability.

[0017] A further technical solution of the present invention is as follows: Based on the operating speed of the paper folding machine and the length of the paper to be folded, the time T3 required for paper folding is calculated. In step S2, the folding time t is recorded starting when the paper has been fed; if the sensor does not detect paper output after the folding time t exceeds the required time T3, it is determined to be a paper jam. Specifically, timing begins when the feeding end of the paper folding machine senses that paper has been fed. If the discharging end of the paper folding machine senses paper output within the required folding time, it is determined that the paper folding machine is operating normally; if the discharging end of the paper folding machine does not show a discharging signal after the required folding time has passed, it is determined to be a paper jam.

[0018] A further technical solution of the present invention is as follows: In step S2, if the difference between the number of papers fed and the number of papers discharged is greater than the maximum set value of the number of folded papers in the folding machine, then it is determined that there is a paper jam. In addition to using time intervals to determine whether there is a paper jam, the number of papers can also be used to determine whether there is a paper jam. Specifically, when the feeding end and the discharging end of the folding machine sense a signal that a paper has been fed or discharged, the digital input module connected to the controller starts counting. When a paper has been fed, the digital input module increments by one; when a paper has been discharged, the digital input module decrements by one. The PLC controller connected to the digital input module calculates the number of papers in the folding machine based on the digital information. When the number of papers is greater than the set maximum number of folded papers X in the folding machine, it is determined that there is a paper jam.

[0019] A further technical solution of the present invention is: in step S2, the sensor signal is recorded in the form of counting pulses. When the difference between the number of feeding signals and the number of discharging signals is greater than the maximum set value of the controller, it is determined that there is a paper jam.

[0020] A further technical solution of the present invention is that the detection method further includes step S3: when a paper jam is detected, an alarm signal is issued and the paper folding machine stops. This solution improves paper utilization, increases the pass rate of paper folding, and enhances the production quality of downstream equipment through timely paper jam alarm and machine shutdown.

[0021] The beneficial effects of this invention are as follows: To solve this working condition, a paper jam detection method is adopted, which uses two photoelectric sensors for material inlet and outlet detection. The PLC calculates the production speed of the folding machine and matches the scanning time of the photoelectric sensors. By detecting the material inlet and outlet, it determines whether there is paper jam inside the folding machine, thereby achieving safe and stable operation of the folding machine and ensuring the pass rate of paper folding. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the origami principle provided by the present invention;

[0023] Figure 2 This is a flowchart of the paper jam detection method for a folding machine according to Embodiment 1 of the present invention;

[0024] Figure 3 This is a flowchart of the paper jam detection method for a folding machine according to Embodiment 2 of the present invention;

[0025] Figure 4 This is a connection diagram of the control system provided by the present invention.

[0026] Reference numerals: 1. Paper, 2. Roller, 3. Limiting element. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0029] Example 1:

[0030] Figure 1 , 2 4 illustrates a paper jam detection method for a paper folding machine. The paper folding machine is equipped with sensors for detecting paper at both the feed and discharge ends. The detection method includes the following steps:

[0031] S1. Calculate the feeding time T1 and discharging time T2 of the paper based on the running speed of the folding machine and the length of the paper before and after folding. When the folding machine is running, the actual feeding time t1 and discharging time t2 sensed by the sensor. If the difference between the actual time and the calculated time is within the set range, it is judged as feeding or discharging. Otherwise, it is judged as interference.

[0032] S2. Determine if there is a paper jam based on the time interval between feeding and discharging.

[0033] In practical applications, some interference factors can affect sensor detection. For example, when someone passes by, the sensor may respond, mistaking it for paper entering or exiting, which can easily cause false alarms for paper jams. In this invention, the paper feeding time and discharging time are first calculated. Then, the actual feeding and discharging times sensed by the sensor are compared with the calculated times. If the time difference is within the allowable range, the sensor is judged to have detected paper; otherwise, it is judged to be an interference signal. This ensures that the sensor detects paper and not other interference. When the signal at the feeding end is determined to be paper, the controller starts timing. When the paper is folded in the folding machine and output from the output end, the controller stops timing when the signal at the discharging end is determined to be paper. If the time difference between feeding and discharging is within the set range, it is judged to be normal operation. If the sensor at the discharging end has not detected paper discharging information after the set time, it is judged to be a paper jam.

[0034] This invention utilizes two photoelectric sensors for paper feeding and discharging detection. The PLC calculates the production speed of the folding machine and matches the scanning time of the photoelectric sensors. By detecting the feeding and discharging, it determines whether there is paper stuck inside the folding machine. This invention achieves accurate diagnosis of paper jam faults in the folding machine, ensuring the safety and stability of the folding machine during production, extending the service life of the folding machine, improving the economic efficiency of the product, reducing the downtime of the folding machine, and reducing production costs.

[0035] Paper jam detection methods need to be matched to different production speeds. Typically, folding machines operate at speeds of 200-400 sheets per minute. Therefore, the scanning time of the photoelectric sensors for feeding and discharging paper needs to be matched to the production speed of the folding machine; otherwise, false alarms or missed alarms will occur. In this invention, the scanning time of the photoelectric sensors for feeding and discharging paper can be controlled according to the production speed of the folding machine. If no paper is detected within its respective scanning time, an alarm signal is generated to stop the folding machine. This invention is adaptable to various production speeds of folding machines, eliminating the possibility of photoelectric sensor malfunctions caused by fixed scanning times, and ensuring the production safety and quality of the folding machine.

[0036] In this invention, the photoelectric sensor at the feeding end is used to detect whether paper enters the folding machine, and the photoelectric sensor at the discharging end is used to detect whether paper is conveyed to downstream equipment.

[0037] The PLC program uses an algorithm to calculate the scanning time of the photoelectric sensors at the feeding and discharging ends, as well as the time required to fold a sheet of paper, based on the production speed, the length of the paper before and after folding, and the folding method. During the folding process, if the photoelectric sensor at the feeding end scans the paper within the scanning time, it will wait for the trigger signal of the photoelectric sensor at the discharging end scanning the paper. If the waiting time exceeds the calculated folding time, it will determine that the folding machine is jammed and stop the folding machine.

[0038] In this embodiment, in step S1, the calculation of feeding time T1 and discharging time T2 in the algorithm is as follows: feeding time T1 equals the length of the paper before folding divided by the running speed; discharging time T2 equals the length of the paper after folding divided by the running speed. Considering the interference of the sensor's own accuracy, the allowable error is Δt. Therefore, if the difference between the actual time and the calculated time is less than Δt, it is determined that the paper has been fed or discharged.

[0039] In this embodiment, the sensing time of the sensor at the feeding end in step S1 is the feeding time t1, and the sensing time of the sensor at the discharging end is the discharging time t2. That is, when material passes through the sensor, the sensor's sensing signal is triggered, the duration of the sensing signal at the feeding end is recorded as t1, and the duration of the sensing signal at the discharging end is recorded as t2.

[0040] In this embodiment, in step S1, if the difference between the feeding time T1 and the feeding time t1 is within a set range, it is determined that feeding has occurred; if the difference between the discharging time T2 and the discharging time t2 is within a set range, it is determined that discharging has occurred. Theoretically, T1 = t1 indicates feeding has occurred, and T2 = t2 indicates discharging has occurred. Considering the accuracy error of the sensor in actual operation, an allowable error range Δt is set. Therefore, if the difference between T1 and t1 is within Δt, it is considered that feeding has occurred; similarly, if the difference between T2 and t2 is within the error range, it is considered that discharging has occurred. This improves the accuracy of judgment and the anti-interference capability.

[0041] In this embodiment, the folding time T3 is calculated based on the operating speed of the folding machine and the length of the paper to be folded. In step S2, the folding time t is recorded when the paper has been fed. If the sensor does not detect paper discharge after the folding time t exceeds the required time T3, it is determined to be a paper jam. Specifically, timing begins when the feeding end of the folding machine senses that paper has been fed. If the discharging end of the folding machine senses paper discharge within the required folding time, it is determined that the folding machine is operating normally. If the discharging end of the folding machine does not show a discharge signal after the required folding time has passed, it is determined to be a paper jam.

[0042] In other embodiments, the folding method may differ, and the calculation of the time required for folding the paper needs to be based on the folding method, the speed of the folding machine, and the length of the paper.

[0043] In this embodiment, the detection method further includes step S3: when a paper jam is detected, an alarm signal is issued, and the paper folding machine stops. This solution improves paper utilization, increases the pass rate of paper folding, and enhances the production quality of downstream equipment through timely paper jam alarm and shutdown.

[0044] like Figure 1The diagram shows a paper folding process in a paper folding machine. Specifically, paper 1 enters the paper folding machine between two rollers 2. Inside the paper folding machine, it is folded by the action of other rollers 2 and limiting components 3. The finished product is then output from the discharge end of the paper folding machine.

[0045] Example 2:

[0046] Figure 1 , 3 4 illustrates a paper jam detection method for a paper folding machine. The paper folding machine is equipped with sensors for detecting paper at both the feed and discharge ends. The detection method includes the following steps:

[0047] S1. Calculate the feeding time T1 and discharging time T2 of the paper based on the running speed of the folding machine and the length of the paper before and after folding. When the folding machine is running, the actual feeding time t1 and discharging time t2 sensed by the sensor. If the difference between the actual time and the calculated time is within the set range, it is judged as feeding or discharging. Otherwise, it is judged as interference.

[0048] S2. Determine if there is a paper jam based on the maximum number of folds X in the folding machine.

[0049] In practical applications, some interference factors can affect sensor detection. For example, when someone passes by, the sensor may respond, mistaking it for paper entering or leaving, which can easily cause false alarms for paper jams. In this invention, the paper feeding time and discharging time are first calculated. Then, the actual feeding and discharging times sensed by the sensor are compared with the calculated times. If the time difference is within the allowable range, the sensor is judged to have detected paper; otherwise, it is judged to be an interference signal, thus ensuring that the sensor detects paper and not other interference items. Furthermore, this embodiment determines whether a paper jam occurs based on the number of sheets in the folding machine. Specifically, when the signal at the feeding end is determined to be paper, the count is incremented by one. When the paper is folded and output from the folding machine, the signal at the discharging end is determined to be paper, and the count is decremented by one. If the count is within a set range, it is considered normal operation; if the count is greater than the maximum number of sheets to be folded in the folding machine (X), it is judged to be a paper jam. This paper jam detection method uses the signal from the photoelectric sensor as a counting pulse to accurately calculate the actual number of folds.

[0050] This invention utilizes two photoelectric sensors for paper feeding and discharging detection. The PLC calculates the production speed of the folding machine and matches the scanning time of the photoelectric sensors. By detecting the feeding and discharging, it determines whether there is paper stuck inside the folding machine. This invention achieves accurate diagnosis of paper jam faults in the folding machine, ensuring the safety and stability of the folding machine during production, extending the service life of the folding machine, improving the economic efficiency of the product, reducing the downtime of the folding machine, and reducing production costs.

[0051] Paper jam detection methods need to be matched to different production speeds. Typically, folding machines operate at speeds of 200-400 sheets per minute. Therefore, the scanning time of the photoelectric sensors for feeding and discharging paper needs to be matched to the production speed of the folding machine; otherwise, false alarms or missed alarms will occur. In this invention, the scanning time of the photoelectric sensors for feeding and discharging paper can be controlled according to the production speed of the folding machine. If no paper is detected within its respective scanning time, an alarm signal is generated to stop the folding machine. This invention is adaptable to various production speeds of folding machines, eliminating the possibility of photoelectric sensor malfunctions caused by fixed scanning times, and ensuring the production safety and quality of the folding machine.

[0052] In this invention, the photoelectric sensor at the feeding end is used to detect whether paper enters the folding machine, and the photoelectric sensor at the discharging end is used to detect whether paper is conveyed to downstream equipment.

[0053] In this embodiment, in step S1, the calculation of feeding time T1 and discharging time T2 in the algorithm is as follows: feeding time T1 equals the length of the paper before folding divided by the running speed; discharging time T2 equals the length of the paper after folding divided by the running speed. Considering the interference of the sensor's own accuracy, the allowable error is Δt. Therefore, if the difference between the actual time and the calculated time is less than Δt, it is determined that the paper has been fed or discharged.

[0054] In this embodiment, the sensing time of the sensor at the feeding end in step S1 is the feeding time t1, and the sensing time of the sensor at the discharging end is the discharging time t2. That is, when material passes through the sensor, the sensor's sensing signal is triggered, the duration of the sensing signal at the feeding end is recorded as t1, and the duration of the sensing signal at the discharging end is recorded as t2.

[0055] In this embodiment, in step S1, if the difference between the feeding time T1 and the feeding time t1 is within a set range, it is determined that feeding has occurred; if the difference between the discharging time T2 and the discharging time t2 is within a set range, it is determined that discharging has occurred. Theoretically, T1 = t1 indicates feeding has occurred, and T2 = t2 indicates discharging has occurred. Considering the accuracy error of the sensor in actual operation, an allowable error range Δt is set. Therefore, if the difference between T1 and t1 is within Δt, it is considered that feeding has occurred; similarly, if the difference between T2 and t2 is within the error range, it is considered that discharging has occurred. This improves the accuracy of judgment and the anti-interference capability.

[0056] In this embodiment, in step S2, if the difference between the number of papers fed and the number of papers discharged is greater than the maximum set value for the number of papers to be folded in the folding machine, then a paper jam is determined. Specifically, when the feeding end and the discharging end of the folding machine sense a signal that a paper has been fed or discharged, the digital input module connected to the controller starts counting. When a paper has been fed, the digital input module increments by one; when a paper has been discharged, the digital input module decrements by one. The PLC controller connected to the digital input module calculates the number of papers in the folding machine based on the digital information. When the number of papers is greater than the set maximum number of papers to be folded in the folding machine X, a paper jam is determined.

[0057] In this embodiment, in step S2, the sensor signal is recorded in the form of counting pulses. When the difference between the number of feeding signals and the number of discharging signals is greater than the maximum set value X for paper folding in the folding machine, it is determined that there is a paper jam.

[0058] In this embodiment, the sensor at the feeding end of the folding machine is a feeding photoelectric sensor, and the sensor at the discharging end is a discharging photoelectric sensor. Both the feeding photoelectric sensor and the discharging photoelectric sensor are connected to a digital input module, which is connected to a PLC controller. The servo motor used to drive the folding machine is connected to the PLC controller through a servo driver.

[0059] In this embodiment, the detection method further includes step S3: when a paper jam is detected, an alarm signal is issued, and the paper folding machine stops. This solution improves paper utilization, increases the pass rate of paper folding, and enhances the production quality of downstream equipment through timely paper jam alarm and shutdown.

[0060] like Figure 1 The diagram shows a paper folding process in a paper folding machine. Specifically, paper 1 enters the paper folding machine between two rollers 2. Inside the paper folding machine, it is folded by the action of other rollers 2 and limiting components 3. The finished product is then output from the discharge end of the paper folding machine.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A paper jam detection method for a paper folding machine, wherein the paper folding machine is equipped with sensors for detecting paper at both the feed end and the discharge end, characterized in that, The detection method includes the following steps: S1. Calculate the paper feeding time T1 and discharging time T2 based on the operating speed of the folding machine and the length of the paper before and after folding. When the folding machine is running, if the actual feeding time t1 sensed by the sensor at the feeding end and the actual discharging time t2 sensed by the sensor at the discharging end are within the set range, it is determined that the signal sensed by the sensor is paper, and the corresponding signal is that the paper has been fed or discharging. Otherwise, it is determined to be an interference item. S2. When the signal at the feed end is determined to be paper, the controller starts timing; when the signal at the discharge end is determined to be paper, the controller stops timing; based on the time interval between the start and stop of timing by the controller or by calculating whether the maximum number of folded papers X in the folding machine is within the specified range, it is determined whether there is a paper jam.

2. The paper jam detection method for a folding machine according to claim 1, characterized in that, In step S1, the feeding time T1 = the length of the paper before folding / the running speed; the discharging time T2 = the length of the paper after folding / the running speed.

3. The paper jam detection method for a folding machine according to claim 1, characterized in that, Based on the operating speed of the folding machine and the length of the paper to be folded, the time T3 required for folding the paper is calculated. In step S2, the folding time t is recorded when the paper has been fed. If the sensor does not detect paper output when the folding time t exceeds the required time T3, it is determined to be a paper jam.

4. The paper jam detection method for a folding machine according to claim 1, characterized in that, In step S2, if the difference between the number of papers fed and the number of papers discharged is greater than the maximum set value for the number of folded papers in the folding machine, then it is determined to be a paper jam.

5. The paper jam detection method for a folding machine according to claim 4, characterized in that, In step S2, the sensor signal is recorded in the form of counting pulses. When the difference between the number of paper feed signals and the number of paper discharge signals is greater than the maximum set value of the controller, it is determined that there is a paper jam.

6. The paper jam detection method for a folding machine according to claim 1, characterized in that, The detection method further includes step S3: when a paper jam is detected, an alarm signal is issued and the paper folding machine stops.

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