A method for ensuring that a laser printer does not print continuously on a cable rewinding device

Abstract

The application relates to a method for guaranteeing that a laser machine does not repeatedly print continuously on a cable rewinding device. The method mainly comprises the following steps: when the cable rewinding device stops due to task switching or receiving a manual parking instruction and the running speed of the core is reduced to 0, a controller records a first meter value L1; the cable rewinding device is restarted, a pay-off rack is reversed to establish initial tension of the core, the core starts to move forward after the tension is established, and the controller records a second meter value L2 at the moment; the controller monitors a printing output signal of the laser printing device, respectively captures a third meter value L3 corresponding to a falling edge of the printing output signal in a historical printing process and a fourth meter value L4 corresponding to a rising edge following the falling edge; the cable rewinding device runs forward, and after the core runs through a starting compensation length and a blank interval length, a printing starting condition is met, and the controller controls the laser printing device to start printing. The application can achieve the technical effects of eliminating repeated printing and ensuring complete and continuous printing.

Description

Technical Field

[0001] This application relates to the field of cable manufacturing technology, and in particular to a method for ensuring that laser printing does not reprint or break on cable rewinding equipment. Background Technology

[0002] In the rewinding process of the cable manufacturing industry, in order to distinguish different wire cores of the same color, it is usually necessary to use laser printing equipment to print wire numbers on the surface of the wire cores.

[0003] During startup, task switching, or manual shutdown of cable rewinding equipment, the operating state of the wire core undergoes drastic changes. For example, when the rewinding equipment starts to establish initial tension, the pay-off end needs to be reversed to pull up the tension lever, causing the wire core to move in the opposite direction. When the equipment receives a stop command, the wire core decelerates before coming to a complete stop due to mechanical inertia. This non-uniform forward and reverse movement of the wire core causes a disconnect between the working cycle of the laser printing equipment and the actual displacement of the wire core. When a wire core that has already been printed passes through the laser printing equipment again in the forward direction due to being pulled back, directly starting printing will result in overlapping printed content; and when the equipment stops, if it happens to be in the middle of the printed content segment, it will forcibly interrupt the integrity of the printed content.

[0004] Based on the above situation, how to solve the technical problem of reprinting and printing interruption caused by the mismatch between the core displacement and the printing action during the cable rewinding start and stop phase is a problem to be solved in this technical field. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this application provides a method for ensuring that laser printers do not reprint or interrupt printing on cable rewinding equipment. This method achieves the technical effect of eliminating reprinting and ensuring complete and continuous printing by precisely quantifying the parking and pulling displacement and the interval between adjacent printing segments, and triggering braking at the edge of a specific printing signal.

[0006] The embodiments of this application adopt the following technical solutions: In a first aspect, this application provides a method to ensure that the laser machine does not re-print or break the print on the cable rewinding equipment, including: Step S1: When the cable rewinding equipment stops due to task switching or receiving a manual stop command and the core running speed drops to 0, the controller records the first meter value L1. Step S2: The cable rewinding equipment is restarted, the wire feeding frame is reversed to establish the initial tension of the wire core. After the tension is established, the wire core begins to move forward. The controller records the second meter value L2 at this time and calculates the difference between L1 and L2 as the starting compensation length. Step S3: The controller monitors the printing output signal of the laser printing equipment, captures the third meter value L3 corresponding to the falling edge of the printing output signal in the historical printing process, and the fourth meter value L4 corresponding to the rising edge immediately following the falling edge, and calculates the difference between L4 and L3 as the length of the blank interval. Step S4: The cable rewinding equipment runs in the forward direction. After the wire core has traveled the starting compensation length and the blank interval length, the printing start condition is met, and the controller controls the laser printing equipment to start printing. Step S5: After receiving a stop command during operation, the cable rewinding equipment decelerates to the pre-stop speed with a set negative acceleration and activates the interrupt. It captures the edge of the printing output signal of the laser printing equipment. When a falling edge of a specified sequence is captured, it controls the cable rewinding equipment to brake and stop, so that the stopping position of the wire core falls within the blank interval between two adjacent printing content segments.

[0007] The above technical solution forms a complete control closed loop that includes back-pulling length compensation, blank interval measurement and compensation, and precise stopping in the blank area. This effectively avoids overlapping printing and content breakage caused by the start and stop of the rewinding equipment, and ensures the printing quality of the wire core.

[0008] In some implementations, in step S3, the printing output signal is connected to two independent digital input ports of the controller; the first digital input port is configured to interrupt on the falling edge to obtain the third metering value L3; and the second digital input port is configured to interrupt on the rising edge to obtain the fourth metering value L4.

[0009] By utilizing the above technical solution, the controller's hardware-level dual input ports independently capture level transitions in different directions, eliminating the time delay caused by single-port switching trigger modes and improving the synchronization accuracy of meter reading acquisition.

[0010] In some implementations, the controller's control program supports pre-setting a rewinding task queue through a human-machine interface. The rewinding task queue contains multiple rewinding tasks, and each rewinding task includes a task number, a reduction length, a total printing length, a pre-stop speed, and a printing line number.

[0011] The above technical solution enables automated multi-task scheduling of cable rewinding, avoiding the risk of printing interruption caused by frequent manual intervention.

[0012] In some implementations, in step S5, the parking instruction is a task switching parking instruction; When the length of cable rewinding produced by the current rewinding task reaches the deceleration length, the cable rewinding equipment decelerates to the pre-stop speed and maintains that speed. When the meter count reaches the total printing length, the cable rewinding equipment does not stop immediately, but switches to the next rewinding task. The meter count is reset to zero, and the laser printing equipment is controlled via communication to switch the printing content of the next rewinding task and enable interrupt capture. No action is taken when the first falling edge is captured; when the second falling edge is captured, the cable rewinding device is stopped by applying the brakes.

[0013] The above technical solution ensures that when switching between two rewinding tasks on the same core, the printing content at the connection point can perfectly avoid the vibration caused by deceleration and braking, thus achieving seamless connection between different printing tasks.

[0014] In some implementations, in step S5, the parking instruction is a manual parking instruction; After receiving a manual stop signal, the cable rewinding device decelerates to the pre-stop speed. Once the pre-stop speed is reached, interrupt capture is immediately activated without waiting for the meter length to reach the preset condition. After capturing two consecutive falling edges, the cable rewinding device is controlled to brake and stop.

[0015] The above technical solution ensures both the timeliness of manual intervention during parking and the prevention of print breakage, minimizing the risk of print breakage even during manual parking.

[0016] In some embodiments, step S5 further includes a dynamic braking verification step before controlling the cable rewinding equipment to stop by applying the brake: The controller calculates the braking distance from triggering the brake to when the linear velocity drops completely to 0, based on the inherent mechanical braking deceleration of the cable rewinding equipment and the current pre-stop speed. The braking coasting distance is compared with the blank interval length measured in step S3. If the braking coasting distance is greater than the blank interval length, the controller adaptively reduces the pre-stop speed in the next printing cycle until the recalculated braking coasting distance is less than or equal to the blank interval length, and then executes the brake stop command when the falling edge is captured.

[0017] The above technical solution fully considers the mechanical and physical inertia of the rewinding equipment, prevents braking and skidding due to excessive pre-stop speed, and fundamentally ensures that each stop falls within the blank interval.

[0018] In some embodiments, a signal anti-jitter cycle is provided in the controller when capturing the edge of the print output signal of the laser printing equipment; When the controller hardware port detects a falling edge level transition, it starts a timer. If the level state reverses within the signal anti-jitter cycle, it is determined to be an interference pulse and filtered out. Only when the level remains low for more than the signal anti-jitter cycle is it confirmed as a valid falling edge signal.

[0019] The above technical solution avoids the false edges of laser signals caused by electromagnetic interference or static electricity in the factory environment, thus eliminating the hidden danger of the controller erroneously triggering the brake to stop the vehicle.

[0020] In some implementations, when the first task in the rewinding task queue is started, the equipment is in the manual wire pulling and winding stage, at which time the meter counter has pressed the wire core to measure the length; the controller directly starts the laser printing equipment to start working through the preset task trigger signal, without having to perform the start compensation length waiting in step S2.

[0021] The above technical solution optimizes the operation logic when threading the first section of wire, avoids unnecessary system idle time, and improves the efficiency of the production preparation stage.

[0022] In some embodiments, in step S2, the wire feeding frame is reversed to pull up the wire core. When the deflection angle of the wire feeding lever is detected to reach a preset angle threshold, it is determined that the initial tension has been established.

[0023] The above technical solution transforms the tension state into an intuitive and measurable mechanical angle variable, providing a precise, stable, and reproducible triggering reference for recording at the metering point L2.

[0024] In some implementations, the polarity of the printing output signal of the laser printing device can be configured through the human-machine interface: when configured to be active high, the high level corresponds to the printing content segment, the low level corresponds to the blank interval segment, and the rising edge represents the start of printing, and the falling edge represents the end of printing.

[0025] The above technical solution greatly enhances compatibility with different brands and models of laser printing equipment on the market, and can match different hardware interfaces without modifying the underlying code.

[0026] In summary, this application includes at least the following beneficial technical effects: 1. This application completely solves the problem of overlapping printing (reprinting) when the tension is reversed and passes through the laser machine in the forward direction through a dual metering compensation mechanism (reverse displacement compensation and inter-segment blank compensation), which greatly improves the printing yield. 2. This application utilizes the level edge of the laser printing output itself to define the blank window for safe stopping, and allows the equipment to brake and stop precisely within this window, avoiding the phenomenon of broken characters (broken print) caused by mechanical cutting. 3. This application introduces a dynamic braking verification and signal anti-jitter mechanism, which overcomes the out-of-bounds error caused by the mechanical coasting inertia of the system at the pre-stop speed, and achieves extremely high stability of electromechanical joint control. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall system architecture and signal connections provided in the embodiments of this application; Figure 2 A schematic diagram of conductor displacement during the parking and tension-reversing process provided in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the measurement of the printing output signal and inter-segment blanking interval of a laser printing device provided in an embodiment of this application. Figure 4 This application provides a schematic diagram of the speed curve for task switching and parking, and the timing of edge capture of the inkjet output signal. Figure 5 The manual parking speed curve and the timing diagram of the inkjet output signal edge capture are provided for embodiments of this application. Figure 6 The flowchart for dynamic braking verification and signal anti-shake control provided in the embodiments of this application is shown. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] refer to Figure 1The hardware connections of the system involved in this application are as follows: The cable rewinding equipment includes a pay-off frame, a take-up frame, a pay-off lever and its angle detection device, a meter counter, and a braking mechanism (brake). The controller is the core of the system and is communicatively connected to the pay-off frame drive motor, the take-up frame drive motor, the meter counter, the braking mechanism, and the human-machine interface. The laser printing equipment is connected to the controller via a communication interface (used to send task switching commands and start / stop commands). The laser printing equipment also has one printing output signal, which is distributed to the controller's first and second digital input ports via hardware cables. The first digital input port is configured for falling edge interrupt triggering, and the second digital input port is configured for rising edge interrupt triggering. An angle detection device is installed on the pay-off lever to feed back the deflection angle signal of the pay-off lever to the controller. The meter counter is installed on the wire core's running path, close to the surface of the wire core, and rotates clockwise or counterclockwise as the wire core moves forward or backward, transmitting the real-time meter value to the controller. The human-machine interface communicates with the controller and is used to preset the rewinding task queue and configure system parameters. Example 1

[0031] This embodiment describes the dual-compensation print start control for preventing duplicate printing.

[0032] It should be noted that during the cable rewinding process, when the rewinding equipment restarts after a mid-process stop, the wire core needs to maintain a certain tension to be wound onto the take-up reel, according to process requirements. Therefore, initial tension must be established first. The process of establishing initial tension is as follows: the take-up frame remains stationary, the pay-off frame reverses to pull up the pay-off lever, causing the wire core to move in the opposite direction. During this reverse movement, the wire core that has already been printed moves back a certain distance in the pay-off direction. When the equipment starts moving forward again, this section of the printed wire core will pass forward again through the lens position of the laser printing equipment. If the controller immediately starts the laser printing equipment to begin printing at this time, the laser printing equipment will print again on the existing text, resulting in overlapping printing (reprinting). In addition, even if the laser printing equipment has completed the physical distance of the reverse pull, the position of restarting printing must fall in a reasonable blank space between the two sections of repeated printing content; otherwise, the positions of the old and new printing sections will be confused. Therefore, a precise dual compensation mechanism is needed. After the equipment restarts, the starting compensation length caused by the reverse pull should be completed first, and then the blank interval length between the front and rear printing sections should be completed. Only after both conditions are met should the laser printing equipment be controlled to start printing, thereby completely eliminating reprinting.

[0033] To solve the above problems, refer to Figure 1 This embodiment provides a start-up control part in a method to ensure that the laser machine does not reprint or break the print on the cable rewinding equipment, which includes two compensation stages.

[0034] Phase 1: Initiating the acquisition and compensation of the compensation length.

[0035] refer to Figure 2 , Figure 2 The right side indicates the direction of reeling in the line, and the left side indicates the direction of releasing the line. Figure 1 The upper part shows the position where printing stops when the machine is stopped, and the lower part shows the position after the tension building and pulling process is completed. The wire core is marked with repeated printing content such as segment k-1, segment k, etc. Since the wire core passes through the meter counter and the lens of the laser printing equipment from left to right, the printing content of segment k-1 passes through the lens of the meter counter and the laser printing equipment earlier than the printing content of segment k.

[0036] When the cable rewinding equipment automatically stops due to an abnormal situation or the operator manually presses the stop button, the control program in the controller continuously monitors the wire core running speed. When the wire speed drops to 0, the controller reads the current reading of the meter counter and records it as the first meter value L1. Assume that the printing stop position is at the end of the k-th segment at this time.

[0037] After handling the abnormal situation, the operator starts the cable rewinding equipment. According to the cable rewinding process, the wire core needs to be wound onto the take-up reel with a certain tension. Therefore, before officially starting the winding, an initial tension needs to be established. The specific process for establishing the initial tension is as follows: the drive motor of the take-up frame remains stationary, while the drive motor of the pay-off frame reverses, causing the pay-off frame to rotate backwards, pulling the pay-off lever upwards. During this backward pulling process, the wire core moves along the pay-off direction (…). Figure 1 Move a certain distance to the left (from the center). Because the meter is in close contact with the surface of the wire core, it reverses as the wire core moves in the opposite direction, and the corresponding meter value gradually decreases based on the first meter value L1.

[0038] During the process of the pay-off frame reversing and raising the pay-off lever, the controller monitors the deflection angle of the pay-off lever in real time through an angle detection device. When the deflection angle of the pay-off lever reaches a preset angle threshold, the controller determines that the initial tension has been established. At this time, the pay-off frame drive motor stops reversing, the equipment enters normal operation mode, and the take-up frame drive motor and the pay-off frame drive motor operate in coordination, and the wire core begins to move forward (…). Figure 1 (Moves to the right). At the instant the wire core begins to move in the forward direction, the controller reads the current reading of the meter counter and records it as the second meter value L2.

[0039] Because the meter counter reverses its counting during the backward pull, the first counting value L1 is greater than the second counting value L2. Assume that at the end of the backward pull, the position of the wire core has moved backward a distance beyond the end position of segment kn. The controller calculates the starting compensation length as L1 - L2. The physical meaning of this starting compensation length is: due to the tension during the backward pull, the already printed wire core has moved back a distance of L1 - L2. When the equipment is running forward, this section of the wire core will pass through the lens of the laser printing equipment again. If printing is started before this section of the wire core has completely passed through the lens of the laser printing equipment, the laser printing equipment will overprint on top of the existing text. Therefore, the controller needs to wait until the meter counter accumulates to the starting compensation length before considering starting the laser printing equipment. This is the first condition for starting the laser printing equipment.

[0040] It should be noted that the starting compensation length is not a fixed value. It depends on the actual number of rotations of the pay-off frame and the actual retraction distance of the wire core each time tension is built. It is affected by factors such as the diameter of the pay-off reel, the tightness of the wire core, and the preset angle threshold of the pay-off lever. Therefore, it needs to be measured in real time each time the machine stops and restarts.

[0041] Phase Two: Obtaining and compensating for the length of the blank interval segment.

[0042] refer to Figure 2 , Figure 2 The diagram illustrates the correspondence between the output level and the print segment of a laser printer. In repetitive printing mode, the laser printer cyclically prints the same segment of content (e.g., a string containing line numbers) onto the surface of the wire core according to a fixed format. During the printing of each segment, the output level of the laser printer is high (i.e., the laser is active); in the blank areas between consecutive repetitive print segments, the output level is low (i.e., the laser is in standby mode).

[0043] When printing repeated content, there should be a reasonable blank interval between consecutive segments. The specific length of this blank interval varies depending on the printed content (e.g., different line number characters, font size), and is not a fixed constant. Therefore, the controller needs to obtain this interval length through online testing.

[0044] During the preceding shutdown process (i.e., the normal operation phase before the current shutdown), the laser printing equipment has completed at least two repeated printing operations of the same segment. During this operation, the control program enables the interrupt capture function for monitoring the laser printing equipment's printing output signal. Because it is necessary to capture both the rising and falling edges of this signal, and to avoid time delays caused by single-port trigger mode switching, the controller splits the physical cable of the printing output signal to two independent digital input ports: the first digital input port is configured for falling edge interrupt mode, triggering an interrupt when the printing output signal transitions from high to low, and the controller reads the current value of the meter counter in the interrupt service routine and records it as the third meter counter value L3; the second digital input port is configured for rising edge interrupt mode, triggering an interrupt when the printing output signal transitions from low to high, and the controller reads the current value of the meter counter in the interrupt service routine and records it as the fourth meter counter value L4.

[0045] refer to Figure 3 L3 is the meter length corresponding to the end of a certain printing segment (falling edge), and L4 is the meter length corresponding to the start of the next printing segment (rising edge) immediately following the end of the previous printing segment. Since the conductor continuously moves in the forward direction, the accumulated value of the meter counter at the start of the next printing segment will necessarily be greater than the accumulated value at the end of the previous printing segment; therefore, L4 > L3. The controller calculates the blank interval length as L4 - L3.

[0046] After the cable rewinding equipment restarts in the forward direction, the controller first waits for the meter counter to complete the starting compensation length in the forward direction (first condition), and then continues to wait for the meter counter to complete the blank interval length in the forward direction (second condition). When both conditions are met, the controller controls the laser printing equipment to start printing via an output signal. At this time, the first segment printed by the laser printing equipment is exactly after the reasonable interval between the preceding and following segments, neither covering the existing text nor disrupting the original spacing pattern between the preceding and following segments.

[0047] Through the aforementioned dual metering compensation control, the physical reverse displacement of the wire core caused by the tension pull (starting compensation length) and the inter-segment blank distance caused by printing layout (blank interval length) are precisely quantified and compensated one by one. The superposition of the two compensation conditions ensures that the restart position of the laser printing equipment falls precisely after the correct blank area, eliminating duplicate printing at its source. Furthermore, since the starting compensation length is obtained through real-time metering value difference, and the blank interval length is obtained through online measurement of the laser printing equipment's own printing output signal edge and metering value, both are not preset constants but dynamic measurements each time. Therefore, this solution can automatically adapt to changes under different operating conditions without manual parameter adjustment. Example 2

[0048] This embodiment describes the parking control and task management of the blank area to prevent print breakage.

[0049] It should be noted that in the cable rewinding process, a single cable product may contain multiple cores of the same color but different wire numbers. Therefore, the rewinding and printing tasks of multiple cores need to be completed sequentially. After each take-up reel is completed, the machine needs to be stopped to replace the reel and switch to the next rewinding task. In addition, operators may manually stop the machine during production for various reasons. In the above-mentioned stopping scenarios, the laser printing equipment is in a periodic repetitive printing mode. If the equipment suddenly stops before a certain section of printing content is completely printed, that section of printing content will be cut off in the middle, resulting in incomplete text (broken print). Because the deflection lens of the laser printing equipment has a limited coverage area, when the section of content is long, once the machine stops during printing, it cannot find the precise position where the printing was interrupted and continue printing when it restarts. More seriously, if the laser printing equipment is forcibly stopped during printing, combined with the aforementioned reverse pulling process, it may also cause local reprinting near the broken print area, making the defect complex. Therefore, a control method is needed that can precisely select the stopping time to ensure that each stop occurs within the blank interval between two complete printed contents, so that the printed contents are never interrupted by stopping.

[0050] Meanwhile, in multi-task rewinding production, the switching of printing content and parameter transfer between different tasks also need to be managed in an orderly manner to reduce the frequency of manual intervention and the risk of operational errors.

[0051] To address the aforementioned issues, this embodiment provides a parking control and task management component in a method for ensuring that the laser machine does not reprint or break prints on a cable rewinding device.

[0052] I. Preset of the rewind task queue.

[0053] The controller's control program supports pre-setting rewinding task queues via a human-machine interface. Before starting the machine or during production breaks, operators can insert multiple rewinding tasks into the queue according to the production plan using the touchscreen of the human-machine interface. Each rewinding task includes the following fields: task number (identifying the order in which tasks are executed), deceleration length (when the machine reaches this length, it begins to decelerate to prepare for subsequent stopping), total printing length (the total length of the wire core that needs to be rewound; reaching this length triggers the stopping procedure), pre-stop speed (the low speed at which the machine maintains operation after deceleration, providing a time window for accurately capturing the edge of the printing signal), and printing wire number (the wire number identifier string that needs to be printed on the wire core). The number of tasks can be set as needed according to actual production requirements, with no upper limit.

[0054] Furthermore, the polarity of the printing output signal of the laser printing equipment can also be configured through the human-machine interface. When configured to be active high, a high level corresponds to a segment of printed content (laser is active), and a low level corresponds to a blank interval segment (laser is waiting). The rising edge indicates the start of a segment of printed content, and the falling edge indicates the end of a segment of printed content. When using laser printing equipment of different brands or models, if the polarity definition of its printing output signal is reversed as described above, the operator can switch the polarity to active low through the human-machine interface. The controller's control program will automatically invert the edge capture logic internally, without requiring modification of the underlying code.

[0055] II. Special initiation procedures for the first task.

[0056] The cable rewinding equipment executes tasks sequentially according to their order numbers in the rewinding task queue. When the first task in the rewinding task queue is initiated, there is a manual pulling and winding process: the operator pulls the wire core head from the pay-off reel, passes it sequentially through the meter counter and below the laser printing equipment lens, and finally fixes it onto the take-up reel. During this manual pulling process, the meter counter has already pressed the wire core surface to begin length measurement. Since this is the first operation, there is no printed content on the wire core, and there is no risk of reprinting. Therefore, the controller directly starts the laser printing equipment based on the preset task trigger signal in the control program, without needing to perform the waiting for the start compensation length and blank interval length as described in Example 1.

[0057] After the operator secures the wire end to the take-up reel, they press the start button again. The take-up frame drive motor begins to rotate and wind the wire, and the control program records the current meter reading. If an abnormal stop or manual stop occurs during the execution of the first task, the reverse length compensation process described in Example 1 needs to be executed upon restarting.

[0058] III. Control methods for parking during task switching.

[0059] refer to Figure 4 , Figure 4 The horizontal axis is the time axis, and the vertical axis is divided into two parts: speed curve and printing status. Figure 4 The timing relationship between equipment speed and printing status during task switching and shutdown is shown.

[0060] When the length of meters produced by the first task (the current task) reaches the preset deceleration length for that task, the corresponding... Figure 4At time t1, the controller initiates deceleration of the cable rewinding equipment's drive system. The equipment gradually decelerates from its normal operating speed vr according to the negative acceleration 'a' set in the control program. This deceleration continues until the core wire speed drops to the preset pre-stop speed 'vs' for the task. At this point, the equipment maintains the pre-stop speed 'vs' at a constant speed and does not decelerate further. Choosing to operate at a lower pre-stop speed 'vs' instead of stopping directly provides the controller with a sufficient time window to capture the edge of the laser printing output signal.

[0061] When the metered length reaches the preset total printing length (i.e., the stopping length) for this task, the corresponding... Figure 4 At time t2, the cable rewinding equipment does not immediately apply the brakes to stop. Instead, the controller performs the following task switching operations: resets the meter count to zero and restarts counting; and sends a task switching command to the laser printing equipment via the communication interface, containing the printing line number for the next task. Upon receiving the command, the laser printing equipment immediately switches the printing template. (Reference) Figure 4 As shown, the laser printing equipment switches from the nth segment (last segment) of the previous task to the first segment of the current (next) task to begin printing. Since the transmission of communication commands and the internal template switching delay of the laser printing equipment are both in the millisecond range, they are negligible compared to the distance the wire core moves at the pre-stop speed.

[0062] While performing the task switching operation, the controller enables interrupt capture of the printing output signal edge of the laser printer. Based on the level polarity configured in the human-machine interface, assuming the printed content segment corresponds to a high level and the blank interval segment corresponds to a low level, the controller focuses on the falling edge. When the controller captures the first falling edge output by the laser printer after the switch (i.e., just after the first segment of the new task's printing content has finished), the controller does not perform any stop operation. When the controller captures the second falling edge after the switch, corresponding to... Figure 4 At time t3, it has been confirmed that the laser printing equipment has completed at least two full printing segments, and the current position has entered the blank interval after the second printing segment has ended. The controller immediately issues a brake stop command, the braking mechanism activates, and the cable rewinding equipment quickly stops operating. Because the stopping time is precisely locked at the beginning of the blank interval, the last printing segment on the wire core has been completely finished, and the next printing segment has not yet started, so there will be no problem of interrupted printing.

[0063] IV. Manual parking control methods.

[0064] refer to Figure 5 , Figure 5 The sequence of events after the operator manually presses the stop button is shown.

[0065] Upon receiving a manual stop signal from the controller, the equipment immediately begins to decelerate. The deceleration phase follows the same logic as the deceleration during task switching stop: according to the set negative acceleration 'a', it gradually decreases from the current operating speed to the pre-stop speed 'vs'. Upon reaching the pre-stop speed 'vs', the corresponding... Figure 5 At time t2, the controller directly activates the interrupt to capture the edge of the printing output signal of the laser printing equipment, without waiting for the meter length to reach the preset total printing length condition, and without executing the task switching program.

[0066] After the controller captures two consecutive falling edges ( Figure 5 At time t3, the brake is applied to stop the laser printing equipment. The first falling edge confirms that the laser printing equipment has completed a full segment of printing content, and the second falling edge confirms that another full segment of printing content has ended and the current position is within the blank interval. At this time, the effect of brake stopping is exactly the same as task switching stopping: the stopping position falls precisely within the blank interval and no printing breaks occur.

[0067] The key difference between manual parking and task-switching parking lies in the trigger entry and subsequent actions: manual parking immediately enters edge capture after reaching the pre-stop speed, resulting in a faster response and making it suitable for emergency or temporary parking scenarios; task-switching parking, on the other hand, requires task switching and meter resetting operations after the meter reading reaches the total printing length, making it suitable for planned production task transition scenarios. However, both employ the same control logic to ensure that the parking position falls within the blank interval.

[0068] The aforementioned blank zone parking control method strongly correlates the mechanical deceleration and braking actions of the cable rewinding equipment with the periodic printing output signal of the laser printing equipment. Utilizing the existing printing output signal of the laser printing equipment as the criterion for stopping, precise brake-operated stopping can be executed within the blank interval after each printing cycle without the need for additional position sensors. This method ensures that the printed content on the wire core remains complete, regardless of planned multi-task switching stopping or temporary manual stopping, preventing the problem of broken printing where the text is truncated in the middle. Simultaneously, the preset rewinding task queue through the human-machine interface enables automatic scheduling and seamless switching of multiple tasks, reducing the frequency of manual intervention and the probability of operational errors, thus improving the automation level of cable rewinding production. Example 3

[0069] It should be noted that the blank area parking control method described in Example 2 has already implemented, at the logical level, the braking stop is triggered at the falling edge of the printing output signal (i.e., the end of the printed content segment and the beginning of the blank interval segment). However, cable rewinding equipment is heavy industrial machinery with significant mechanical inertia. When the braking mechanism receives the braking command, the wire core does not stop moving instantly, but undergoes a braking deceleration process under the action of friction. The wire core will continue to slide forward for a certain distance before coming to a complete stop. This distance is called the braking sliding distance. If the braking sliding distance is greater than the length of the blank interval segment measured in the printing output signal, then the final stopping position of the wire core will cross the blank interval segment and slide into the area where the next printed content segment is located. This means that although the controller triggers the braking at the correct time (falling edge), the physical stopping position of the wire core still falls within the printed content segment rather than the blank interval segment, causing the anti-print breakage strategy to physically fail.

[0070] Braking distance is related to the speed of the brake pads at the moment of braking (i.e., the pre-stop speed) and the deceleration of the brake mechanism. Over long-term use, the brake pads will wear down, and the deceleration may gradually decrease, leading to an increased braking distance. If the pre-stop speed is set too high or the brake pads are severely worn, the braking distance may exceed the length of the blanking interval.

[0071] Furthermore, cable production workshops are industrial environments with high-frequency electromagnetic interference sources (such as frequency converters and the start-stop of high-power motors) and static electricity accumulation. The printing output signal of laser printing equipment may be subject to electromagnetic coupling interference during transmission, generating transient pulses (glitch signals) on the order of microseconds to milliseconds. If the controller's digital input port directly treats these glitch pulses as valid falling edge signals, it may mistakenly trigger the brake to stop the laser printing equipment while it is still in the middle of the printing process, causing printing interruptions; or it may mistakenly trigger the stop at an inappropriate location, causing deviations in subsequent restart compensation calculations.

[0072] To address the aforementioned issues, this embodiment further incorporates a dynamic braking verification mechanism and a signal anti-shake filtering mechanism, building upon the blank area parking control method described in Embodiment 2.

[0073] I. Dynamic braking verification mechanism.

[0074] refer to Figure 6 , Figure 6 The complete process of dynamic braking verification and signal anti-shake control is shown.

[0075] After the cable rewinding equipment decelerates to the pre-stop speed vs, before officially activating the interrupt capture of the inkjet output signal edge, the controller first performs a dynamic braking check. The specific steps are as follows: (1) Obtain system parameters. The controller reads the current pre-stop speed vs (specified by the current task in the pre-set rewinding task queue in the human-machine interface) and the inherent mechanical brake deceleration a_brake of the cable rewinding equipment. This brake deceleration is a parameter value calibrated by the equipment manufacturer or obtained through preliminary no-load braking tests, and is pre-stored in the controller's memory. After the equipment is put into use, this value can be updated periodically through the calibration program to reflect the wear status of the brake pads.

[0076] (2) Calculate the theoretical braking distance. The controller calculates the theoretical distance S from the moment the brake is triggered until the conductor speed drops to zero, based on the kinematic formula: braking distance S = vs² / (2×a_brake).

[0077] (3) Comparison with the length of the blank interval. The controller compares the calculated braking distance S with the length of the blank interval (L4-L3) obtained by online measurement of the edge of the inkjet output signal and the meter value in Example 1.

[0078] (4) Judgment and Adaptive Speed ​​Control. If the braking distance S is less than or equal to the blank interval length (L4-L3), it means that after triggering the brake at the current speed, the conductor can stop completely within the blank interval range, the braking verification is passed, and the controller enters the subsequent interrupt capture stage. If the braking distance S is greater than the blank interval length (L4-L3), it means that at the current pre-stop speed, even if the brake is triggered at the beginning of the blank interval, the conductor will slide out of the blank interval and invade the next section of the printed content area. At this time, the controller automatically performs adaptive speed reduction: it sends a command to the inverter of the drive system to further reduce the pre-stop speed vs according to the preset speed reduction step value (e.g., 0.5 m / min each time), forming a new pre-stop speed vs'. The controller uses the new vs' to recalculate the braking distance S'=vs'² / (2×a_brake) and compares it with the blank interval length again. The above speed reduction and recalculation process is executed cyclically until the braking distance is less than or equal to the blank interval length.

[0079] Since the adaptive speed regulation described above is performed after the equipment has reached the pre-stop speed and is maintaining a low and constant speed, each deceleration step has a very minor impact on the wire core operation and will not affect the normal printing quality of the laser printing equipment. At the same time, the computational load of the adaptive speed regulation process is extremely small (one floating-point division and one comparison operation), which can be completed within one scan cycle of the controller, without introducing any perceptible time delay.

[0080] II. Signal anti-shake filtering mechanism.

[0081] After the dynamic braking test is passed and the controller is officially started to interrupt and capture the printing output signal edge of the laser printing equipment, the controller is equipped with a signal anti-jitter cycle to filter out false edge signals caused by electromagnetic interference or static electricity.

[0082] refer to Figure 6 The signal anti-jitter judgment section operates as follows: When the controller's hardware port (first digital input port) detects a transition from a high level to a low level in the printing output signal (i.e., capturing a suspected falling edge), the controller does not immediately classify it as a valid falling edge. Instead, it starts a timer. The preset duration of this timer is the signal anti-jitter period, for example, set to 5 milliseconds. During the signal anti-jitter period, the controller continuously monitors the level of the printing output signal. If the level of the printing output signal reverses within 5 milliseconds (i.e., jumps back from a low level to a high level), it indicates that the previous level transition was a glitch pulse caused by transient interference, not a valid falling edge generated after the laser printing equipment truly finishes printing. The controller classifies this pulse as an interference pulse and filters it out. The timer is reset, and the controller continues monitoring, waiting for the next suspected falling edge.

[0083] Only when the printing output signal remains low for more than the signal debouncing period (i.e., the 5-millisecond timer has expired but the level has not reversed) does the controller confirm that a valid falling edge signal has been captured, and then proceed with subsequent processing according to the logic described in Example 2 (ignoring the first valid falling edge and performing brake stop on the second valid falling edge).

[0084] The value of the signal anti-jitter cycle needs to be determined based on the actual operating conditions. On the one hand, the anti-jitter cycle cannot be set too short, otherwise it will be unable to effectively filter out millisecond-level electromagnetic interference pulses commonly found in industrial environments. On the other hand, the anti-jitter cycle cannot be set too long, otherwise it will delay the confirmation time of the effective falling edge, resulting in a later braking moment and a later stopping position of the conductor within the blank interval. In typical cable rewinding conditions, the pre-stop speed is generally 5 to 15 meters per minute, and the length of the blank interval is generally tens to hundreds of millimeters. The conductor displacement corresponding to a 5-millisecond anti-jitter cycle is approximately 0.4 to 1.25 milliseconds, which is much smaller than the length of the blank interval and will not have a perceptible impact on stopping accuracy.

[0085] Through the aforementioned dynamic braking verification and signal anti-jitter mechanism, this embodiment addresses two levels of practical engineering problems based on the logic control of Embodiment 2: First, it overcomes the inherent mechanical inertia problem of heavy industrial equipment. By calculating the braking and sliding distance in real time and comparing it with the length of the blank interval, the operating speed is adaptively reduced when the physical braking distance is insufficient to ensure a safe stop, ensuring from a dynamic perspective that the final stopping position of the wire core absolutely falls within the blank interval. Second, it overcomes the signal distortion problem caused by electromagnetic interference in the industrial environment. Through timer anti-jitter filtering, it ensures that the controller only responds to the edges of the true and valid inkjet output signal, preventing improper stopping caused by false signals triggering the brake. The synergistic effect of these two mechanisms gives the anti-duplicate printing and anti-broken printing control methods of this application high robustness and reliability under actual complex working conditions.

[0086] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for ensuring that laser printing is not re-printed or interrupted on a cable rewinding device, characterized in that, include: Step S1: When the cable rewinding equipment stops due to task switching or receiving a manual stop command and the core running speed drops to 0, the controller records the first meter value L1. Step S2: The cable rewinding equipment is restarted, the wire feeding frame is reversed to establish the initial tension of the wire core. After the tension is established, the wire core begins to move forward. The controller records the second meter value L2 at this time and calculates the difference between L1 and L2 as the starting compensation length. Step S3: The controller monitors the printing output signal of the laser printing equipment, captures the third meter value L3 corresponding to the falling edge of the printing output signal in the historical printing process, and the fourth meter value L4 corresponding to the rising edge immediately following the falling edge, and calculates the difference between L4 and L3 as the length of the blank interval. Step S4: The cable rewinding equipment runs in the forward direction. After the wire core has traveled the starting compensation length and the blank interval length, the printing start condition is met, and the controller controls the laser printing equipment to start printing. Step S5: After receiving a stop command during operation, the cable rewinding equipment decelerates to the pre-stop speed with a set negative acceleration and activates the interrupt. It captures the edge of the printing output signal of the laser printing equipment. When a falling edge of a specified sequence is captured, it controls the cable rewinding equipment to brake and stop, so that the stopping position of the wire core falls within the blank interval between two adjacent printing content segments.

2. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 1, characterized in that, In step S3, the printing output signal is connected to two independent digital input ports of the controller; the first digital input port is configured to interrupt on the falling edge to obtain the third metering value L3; the second digital input port is configured to interrupt on the rising edge to obtain the fourth metering value L4.

3. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 1, characterized in that, The controller's control program supports the preset rewinding task queue through a human-machine interface. The rewinding task queue contains multiple rewinding tasks, and each rewinding task includes the task number, deceleration length, total printing length, pre-stop speed, and printing line number.

4. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 3, characterized in that, In step S5, the parking instruction is a task switching parking instruction; When the length of cable rewinding produced by the current rewinding task reaches the deceleration length, the cable rewinding equipment decelerates to the pre-stop speed and maintains that speed. When the meter count reaches the total printing length, the cable rewinding equipment does not stop immediately, but switches to the next rewinding task. The meter count is reset to zero, and the laser printing equipment is controlled via communication to switch the printing content of the next rewinding task and enable interrupt capture. No action is taken when the first falling edge is captured; when the second falling edge is captured, the cable rewinding device is stopped by applying the brakes.

5. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 1 or 4, characterized in that, In step S5, the parking instruction is a manual parking instruction; After receiving a manual stop signal, the cable rewinding device decelerates to the pre-stop speed and immediately starts interrupt capture upon reaching the pre-stop speed, without waiting for the meter length to reach the preset condition. After capturing two consecutive falling edges, the control system brakes the cable rewinding device to stop.

6. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 1, characterized in that, In step S5, before controlling the cable rewinding equipment to stop by applying the brake, a dynamic braking verification step is also included: The controller calculates the braking distance from triggering the brake to when the linear velocity drops completely to 0, based on the inherent mechanical braking deceleration of the cable rewinding equipment and the current pre-stop speed. The braking coasting distance is compared with the blank interval length measured in step S3. If the braking coasting distance is greater than the blank interval length, the controller adaptively reduces the pre-stop speed in the next printing cycle until the recalculated braking coasting distance is less than or equal to the blank interval length, and then executes the brake stop command when the falling edge is captured.

7. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 6, characterized in that, When capturing the edge of the printing output signal of the laser printing equipment, the controller is equipped with a signal anti-jitter cycle; When the controller hardware port detects a falling edge level transition, it starts a timer. If the level state reverses within the signal anti-jitter cycle, it is determined to be an interference pulse and filtered out. Only when the level remains low for more than the signal anti-jitter cycle is it confirmed as a valid falling edge signal.

8. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 3, characterized in that, When the first task in the rewinding task queue is started, the equipment is in the manual wire pulling and winding stage. At this time, the meter counter has pressed the wire core to measure the length. The controller directly starts the laser printing equipment to start working through the preset task trigger signal, without having to perform the start compensation length waiting in step S2.

9. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 1, characterized in that, In step S2, the wire feeding frame is reversed to pull up the wire core. When the deflection angle of the wire feeding lever reaches a preset angle threshold, it is determined that the initial tension has been established.

10. The method for ensuring that the laser machine does not re-print or break print on the cable rewinding equipment according to claim 1, characterized in that, The polarity of the printing output signal of the laser printing equipment can be configured through the human-machine interface: when configured to be active high, the high level corresponds to the printing content segment, the low level corresponds to the blank interval segment, and the rising edge represents the start of printing and the falling edge represents the end of printing.

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