Fixing abnormality recognition method and device, control unit, fixing device

Abstract

The application provides a fixing abnormality recognition method and device, a control unit and a fixing device. The fixing abnormality recognition method comprises the following steps: monitoring the surface temperature of a heating roller in real time; judging whether the surface temperature reaches a pre-warning temperature value; if the surface temperature of the heating roller reaches the pre-warning temperature value, judging that a first fixing abnormality occurs; the pre-warning temperature value is greater than a first critical value and smaller than a second critical value; the first critical value is the maximum temperature of overshoot of the heating roller when the fixing device does not contain medium; and the second critical value is the maximum temperature of overshoot of the heating roller when the fixing device contains medium. Compared with the prior art, the fixing abnormality recognition method provided by the application effectively avoids the emergency situation that the abnormality pre-warning occurs after the surface temperature reaches the serious state of the second critical value, prevents the paper carbonization, burnt smell, image damage and other phenomena caused by the further temperature rise of the fixing device after the user continues to use, can accurately recognize the internal temperature abnormality of the fixing device, and greatly avoids safety accidents.

Description

Technical Field

[0001] This invention relates to the field of image forming technology, and more particularly to a fixing anomaly identification method and apparatus, as well as a computer-readable storage medium, a control unit, and a fixing device. Background Technology

[0002] In existing printer fusing technology, the fusing mechanism typically uses heating to fuse the recorded image. During fusing, if there is film, paper roll, or other foreign matter on the heating roller, the temperature detected by the temperature sensor will deviate from the actual surface temperature of the heating roller. This can easily affect the printer's control over the fusing temperature, causing the printer to fail to recognize the abnormal state. Alternatively, if the user does not remove the paper roll after the printer issues a heating roller paper roll error and allows the printer to resume from the abnormal state, the temperature sensor will not be able to recognize the true surface temperature of the heating roller. The printer will continue to execute the command, and the heating roller may be heated to an even higher temperature, causing paper carbonization or fire. Summary of the Invention

[0003] In view of this, the present invention provides a fixing anomaly identification method, which can identify the abnormal temperature state of the fuser regardless of whether there is a roll of paper or other media.

[0004] To achieve the above objectives, the present invention provides a fixing anomaly identification method in a first aspect, executed in a fixing control unit, comprising: real-time monitoring of the surface temperature of the heating roller; determining whether the surface temperature reaches a warning temperature value; if the surface temperature of the heating roller reaches the warning temperature value, determining that a first fixing anomaly has occurred; wherein the warning temperature value is greater than a first threshold value and less than a second threshold value, the first threshold value being the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second threshold value being the maximum overshoot temperature of the heating roller when there is medium in the fuser.

[0005] Compared with existing technologies, this fixing anomaly identification method has at least the following beneficial effects: After the heating roller enters the preheating stage, by comparing the temperature with the warning temperature value, it monitors whether the temperature of the heating roller continues to rise and reaches the warning temperature value after entering the ready stage. The warning temperature value is selected between the first critical value and the second critical value, providing a margin for the presence of media after the surface temperature of the heating roller reaches the first critical value and before the abnormal alarm. This allows the abnormal alarm to take into account both the presence and absence of recording materials in the fuser. Furthermore, the warning temperature value is less than the second critical value, effectively avoiding the emergency situation where the abnormal alarm only occurs after the surface temperature reaches the second critical value. This prevents the fuser temperature from rising further after continued use, which could lead to paper carbonization, burnt odor, and image damage. It can accurately identify the internal temperature abnormality of the fuser, greatly avoiding safety accidents.

[0006] In conjunction with the first aspect, in one possible design, if the surface temperature of the heating roller reaches the warning temperature value, the following steps are also included: recording the duration when the surface temperature is greater than or equal to the warning temperature value; determining whether the duration is greater than or equal to the preset time value; if the duration is greater than or equal to the preset time value, determining that a second fixing abnormality has occurred.

[0007] In conjunction with the first aspect, in one possible design, recording the duration for which the surface temperature is greater than or equal to the warning temperature value includes: counting the duration for which the surface temperature is greater than or equal to the warning temperature value at a preset time interval, wherein the preset time value is a preset count value.

[0008] In conjunction with the first aspect, in one possible design, a preliminary step prior to the real-time monitoring of the surface temperature of the heating roller is also included, the preliminary step including: determining whether the surface temperature has reached the preheating temperature value; when the surface temperature reaches the preheating temperature value, determining that the heating roller has entered the ready stage from the preheating stage, and proceeding to the real-time monitoring of the surface temperature of the heating roller.

[0009] Secondly, the present invention proposes a fixing anomaly identification method, executed in a fixing control unit, characterized by comprising: real-time monitoring of the surface temperature of the heating roller; when the surface temperature reaches a preheating temperature value, determining that the heating roller has entered a ready stage from the preheating stage, and continuing to monitor the surface temperature of the heating roller; determining whether the surface temperature has reached a warning temperature value; if the surface temperature of the heating roller reaches the warning temperature value, recording the duration when the surface temperature is greater than or equal to the warning temperature value; determining whether the duration is greater than or equal to a preset time value; if the duration is greater than or equal to the preset time value, determining that a fixing anomaly has occurred; wherein the warning temperature value is greater than a first critical value and less than a second critical value, the first critical value being the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second critical value being the maximum overshoot temperature of the heating roller when there is medium in the fuser.

[0010] Compared with the prior art, this fixing anomaly identification method has at least the following beneficial effects: Unlike the first aspect embodiment, this fixing anomaly identification method adds a duration judgment condition to the condition that the surface temperature of the heating roller is greater than the preheating temperature value, which can further improve the accuracy of identifying abnormal temperature conditions inside the fuser. After the heating roller enters the preheating stage, by comparing the judged temperature with the warning temperature value, it monitors whether the temperature of the heating roller continues to rise and reaches the warning temperature value after entering the ready stage. The warning temperature value is selected between the first critical value and the second critical value. After the surface temperature of the heating roller reaches the first critical value... Furthermore, it has a margin for the presence of media before the abnormal alarm, so that the abnormal alarm can take into account both the presence and absence of recording materials in the fuser. The warning temperature value is less than the second critical value, which effectively avoids the emergency situation of abnormal alarm occurring only after the surface temperature reaches the second critical value. By using the duration judgment condition, it can avoid false alarms caused by static electricity in the medium or instantaneous abnormality of the temperature sensor (such as overshoot voltage) that causes the instantaneous detected temperature of the temperature sensor to exceed the warning temperature value, ensuring accurate control of the fuser abnormality and timely judgment of fuser abnormality.

[0011] In conjunction with the second aspect, in one possible design, recording the duration for which the surface temperature is greater than or equal to the warning temperature value includes: counting the duration for which the surface temperature is greater than or equal to the warning temperature value at a preset time interval, wherein the preset time value is a preset count value.

[0012] In conjunction with the second aspect, in one possible design, a preliminary step prior to the real-time monitoring of the surface temperature of the heating roller is also included. The preliminary step includes: determining whether the surface temperature has reached the preheating temperature value; when the surface temperature reaches the preheating temperature value, determining that the heating roller has entered the ready stage from the preheating stage, and proceeding to the real-time monitoring of the surface temperature of the heating roller.

[0013] Thirdly, the present invention also provides a fixing anomaly identification device, disposed in a fixing control unit, comprising: a monitoring module for real-time monitoring of the surface temperature of the heating roller; a first temperature judgment module for judging whether the surface temperature reaches a warning temperature value; and a first anomaly judgment module for judging that a first fixing anomaly has occurred when the surface temperature of the heating roller reaches the warning temperature value; wherein the warning temperature value is greater than a first critical value and less than a second critical value, the first critical value being the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second critical value being the maximum overshoot temperature of the heating roller when there is medium in the fuser.

[0014] Compared with the prior art, this anomaly identification program has at least the following beneficial effects: This fixing anomaly identification program implements the method in the first aspect embodiment through a computer, which can effectively take into account both situations where the fixing device has recording materials or other media and situations where there are no recording materials or other media. Moreover, the warning temperature value is less than the second critical value, which effectively avoids the emergency situation of an anomaly warning only occurring after the surface temperature reaches the second critical value. This prevents the fixing device temperature from rising further after the user continues to use the device, which could lead to phenomena such as paper carbonization, burning odor, and image damage. It can accurately identify the internal temperature anomaly of the fixing device, thus greatly avoiding safety accidents.

[0015] In conjunction with the third aspect, one possible design also includes: a timing module for recording the duration when the surface temperature of the heating roller reaches the warning temperature value; a time judgment module for judging whether the duration is greater than or equal to a preset time value; and a second anomaly judgment module for judging that a second fixing anomaly has occurred when the duration is greater than or equal to the preset time value.

[0016] In conjunction with the third aspect, one possible design also includes: a second temperature judgment module, used to determine whether the real-time temperature data is less than the warning temperature value when the duration is less than the preset time value; if the real-time temperature data is less than the warning temperature value, then a timing stop command is sent to the counting module.

[0017] In conjunction with the third aspect, in one possible design, a pre-execution module is also included, which is used to determine that the heating roller has entered the ready stage from the preheating stage when the surface temperature reaches the preheating temperature value, and to cause the monitoring module to start monitoring the surface temperature of the heating roller.

[0018] Fourthly, the present invention also proposes a fixing anomaly identification device, disposed in the fixing control unit, comprising: a monitoring module for real-time monitoring of the surface temperature of the heating roller; a first temperature judgment module for judging whether the surface temperature has reached a warning temperature value; a timing module for recording the duration when the surface temperature of the heating roller reaches the warning temperature value; an anomaly judgment module for judging that a fixing anomaly has occurred when the duration is less than or equal to a preset time value; and a second temperature judgment module for judging whether the surface temperature is less than the warning temperature value when the duration is less than the preset time value, and if the surface temperature is less than the warning temperature value, issuing a timing stop command to the timing module; wherein the warning temperature value is greater than a first threshold value and less than a second threshold value, the first threshold value being the maximum overshoot temperature of the heating roller when there is no medium in the fixing unit, and the second threshold value being the maximum overshoot temperature of the heating roller when there is medium in the fixing unit.

[0019] Compared with the prior art, this anomaly identification program has at least the following beneficial effects: This fixing anomaly identification program implements the method in the second aspect embodiment by computer, which can effectively take into account both the presence and absence of recording materials and other media in the fixing device, and the warning temperature value is less than the second critical value, effectively avoiding the emergency situation of an anomaly warning only occurring after the surface temperature reaches the second critical value, preventing the temperature of the fixing device from rising further after continued use by the user, which could lead to phenomena such as paper carbonization, burning odor, and image damage. It can accurately identify the internal temperature anomaly of the fixing device, greatly avoiding safety accidents.

[0020] Fifthly, the present invention also proposes a control unit comprising: a memory; a processor; and a computer program; wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method described in the first aspect or the second aspect.

[0021] Compared with existing technologies, this control unit has at least the following advantages: it is applicable to structures or fusers with all heating methods, includes temperature anomaly detection for heating components with built-in heat sources, has a wide protection range, and prevents safety accidents.

[0022] In a sixth aspect, the present invention also provides a computer-readable storage medium comprising a computer program that, when executed, controls the device on which the computer-readable storage medium is located to perform the method described in the first aspect or the second aspect.

[0023] Compared with the prior art, this computer-readable storage medium has at least the following advantages: it is applicable to structures or fusers with all heating methods, encompasses temperature anomaly detection of heating components with built-in heat sources, provides broad protection, and prevents safety accidents.

[0024] In a seventh aspect, the present invention also provides a fuser, comprising: a heating roller configured to heat a recording material; a driving component configured to drive the recording material through the heating roller; a detection component configured to detect the surface temperature on the heating roller and output real-time temperature data; and a control component, including the control unit described in the fifth aspect, configured to receive the real-time temperature data from the detection component and determine whether the fixing process is abnormal.

[0025] Compared with the prior art, this fuser has at least the following beneficial effects: the control unit of the fifth aspect embodiment solves the problem of difficulty in identifying abnormalities caused by the difference in the magnitude of temperature overshoot when there is a medium between the temperature sensor and the heat source (temperature sensor sensing part) and when there is no medium, and prevents the temperature of the fuser from rising further after the user continues to use it, which could lead to paper carbonization, scorching, image damage or even safety accidents.

[0026] Other features and advantages of embodiments of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the embodiments of the invention. The objects and other advantages of embodiments of the invention are realized and obtained in accordance with the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. 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 structure of an image forming apparatus provided in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 The structural diagram of the fuser provided in the image is shown below.

[0030] Figure 3A comparison chart of temperature curves during the preheating stage before and after the paper roll is removed;

[0031] Figure 4 This is a schematic flowchart of a fixing anomaly identification method provided in one embodiment of the present invention;

[0032] Figure 5 For the implementation of this invention Figure 4 The flowchart of the method provided in the document;

[0033] Figure 6 This is a schematic flowchart of a fixing anomaly identification method provided in another embodiment of the present invention;

[0034] Figure 7 For the implementation of this invention Figure 6 The flowchart of the method provided in the document;

[0035] Figure 8 This is a schematic flowchart of a fixing anomaly identification method provided in another embodiment of the present invention;

[0036] Figure 9 For the implementation of this invention Figure 8 The flowchart of the method provided in [the document / document]

[0037] Figure 10 This is a schematic diagram of the structure of the control unit provided in an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the fixing anomaly recognition device provided in one embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the fixing anomaly recognition device provided in another embodiment of the present invention.

[0040] Figure label:

[0041] 100 Paper tray, 200 Paper feeding mechanism, 300 Developing mechanism, 400 Fixer, 410 Heating roller, 411 Heating source, 420 Detection component, 430 Pressure roller, 500 Paper discharge mechanism;

[0042] 610 memory, 620 processor;

[0043] 710 Pre-execution module, 720 Monitoring module, 730 First temperature judgment module, 740 First anomaly judgment module, 750 Timing module, 760 Time judgment module, 770 Second anomaly judgment module, 780 Second temperature judgment module.

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. Detailed Implementation

[0045] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0048] Image forming equipment includes, but is not limited to, printers, copiers, fax machines, scanners, and multifunction printers that integrate printing, copying, faxing, and scanning functions into one unit. Their function is to print images or text on imaging media.

[0049] The structure of the image forming apparatus provided in the present invention will be described below, and specific embodiments thereof will be described.

[0050] See Figure 1 An image forming apparatus includes a paper tray 100, a paper feeding mechanism 200, a developing mechanism 300, a fixing unit 400, and a paper discharge mechanism 500. The paper tray 100 contains recording materials such as paper. The paper feeding mechanism 200 is used to transport the recording materials in the paper tray 100 to the developing mechanism 300. The developing mechanism 300 includes a processing box and a laser scanning device. The processing box is equipped with a photosensitive drum, a developing roller, a toner cartridge, and a charging roller for transferring the recorded image onto the recording material. The fixing mechanism is used to fix the recorded image onto the recording material. The paper discharge mechanism 500 is used to discharge the printed recording material.

[0051] In practice, the paper feeding mechanism 200 delivers the recording material from the paper tray 100 to the developing mechanism 300. After the charging roller on the developing mechanism 300 charges the surface of the photosensitive drum, the laser scanning device irradiates the surface of the photosensitive drum to form an electrostatic latent image. The developing roller transfers the toner in the toner hopper to the photosensitive drum, forming a recorded image on the surface of the photosensitive drum. This recorded image is transferred to the recording material directly or indirectly. At this time, the recording material is continued to be transported by the paper feeding mechanism 200 to the fuser 400. The fuser melts the toner of the recorded image onto the recording material by heating. After the fusing is completed, the recording material is discharged to the outside of the image forming equipment via the paper discharge mechanism 500.

[0052] Next, the fuser 400 mentioned in the above embodiments of the present invention will be further described.

[0053] See Figure 2 A fuser 400 includes a heating roller 410, a drive assembly, a detection assembly 420, and a control assembly. The heating roller 410 has a heat source 411 inside, which heats the heating roller 410 and raises its surface temperature. The drive assembly drives the recording material to move and adhere to the surface of the heating roller 410, so that the recording material is heated, fixed, and then detached. The detection assembly 420 detects the temperature on the heated surface of the heating roller. The control assembly controls the heating roller 410, the drive assembly, and the detection assembly 420 to work together to complete the fixing process of the recording material.

[0054] Specifically, the drive assembly includes a pressure roller 430, which forms a heating gap with the heating roller 410. After the heating roller 410 is preheated by the heat source 411, it enters the ready stage. The pressure roller 430 presses the recording material with the recorded image onto the heating surface of the heating roller 410 to achieve fixing.

[0055] In this embodiment, the heating source 411 can be an electric heating wire, which is disposed inside the heating roller 410. Of course, the heating source 411 can also be other electric heating components, all of which are within the scope of the present invention.

[0056] Example 1

[0057] In some embodiments of the present invention, a fixing anomaly identification method is provided, which is executed in a fixing control unit. The fixing control unit can be a control component in the aforementioned fuser, or a print drive device on an image forming device; no limitation is made herein. See also... Figure 4 The method includes:

[0058] Step S1: Monitor the surface temperature of the heating roller in real time;

[0059] Step S2: Determine whether the surface temperature has reached the warning temperature value. If the surface temperature of the heating roller reaches the warning temperature value, it is determined that the first fixing abnormality has occurred.

[0060] The warning temperature values ​​are those greater than the first critical value and less than the second critical value. (See also...) Figure 3 The graph shows a comparison of the temperature curves during the preheating stage before and after the paper roll is removed. The horizontal axis represents the elapsed time after the heating roller enters the preheating stage, and the vertical axis represents the surface temperature of the heating roller. l1 is the temperature curve when the paper roll is removed, and l2 is the temperature curve when the paper roll is not removed.

[0061] T0 is the preheating temperature value. When the surface temperature of the heating roller reaches T0, the preheating stage is completed, and the recording material can be fed into the fuser. At this temperature, the toner on the recorded image melts on its surface to complete the fixing operation.

[0062] T1 refers to the first critical value mentioned above. This first critical value is the maximum temperature that can be reached by overshoot when there is no medium in the fuser. Specifically, it refers to the critical temperature at which the fuser overshoots to its maximum temperature when the paper on the heating roller has been removed or no paper has been fed. It should be noted that overshoot refers to the phenomenon where the temperature continues to rise after heating has stopped. Therefore, the maximum temperature that can be reached by overshoot mentioned above refers to the maximum temperature peak detected by the temperature sensor after heating has stopped, assuming the heating roller does not contain any paper. The first critical value can be determined based on test data. For example, the temperature change curve of the heating roller without paper can be measured multiple times at the rated voltage (e.g., 220V), and the first critical value can be determined based on the maximum overshoot temperature in the measurement results. To reduce false alarms, the maximum overshoot temperature of the heating roller without paper, measured at a voltage exceeding the rated voltage (e.g., 264V), can be used as the first critical value. Since the maximum overshoot temperature obtained in this way is usually higher than the temperature measured at the rated voltage, false alarms are less likely to occur. Alternatively, the overshoot temperature of the heating roller without paper roll, measured at a voltage below the rated voltage (e.g., 187V), can be used as the first critical value. Since the maximum overshoot temperature obtained in this way is usually lower than the temperature measured at the rated voltage, it is easier to ensure accuracy and less likely to be missed.

[0063] T2 is the second critical value mentioned above. This second critical value is the maximum temperature that can be reached by overshoot when there is media inside the fuser. Specifically, it refers to the critical temperature at which the fuser overshoots to its maximum when the paper roll on the heating roller surface is not removed or when media is present. It should be noted that overshoot refers to the phenomenon where the temperature continues to rise after heating has stopped. That is, the maximum temperature that can be reached by overshoot mentioned above refers to the maximum temperature peak detected by the temperature sensor after heating has stopped, assuming the heating roller contains paper. The second critical value can be determined based on test data. For example, the temperature change curve of the heating roller containing paper can be measured multiple times at the rated voltage (e.g., 220V), and the second critical value can be determined based on the maximum overshoot temperature in the measurement results. To reduce false alarms, the maximum overshoot temperature of the heating roller containing paper, measured at a voltage exceeding the rated voltage (e.g., 264V), can be used as the second critical value. Since the maximum overshoot temperature obtained in this way is usually slightly higher than the temperature measured at the rated voltage, false alarms are less likely to occur. Alternatively, the overshoot temperature of the heating roller without paper roll, measured at a voltage below the rated voltage (e.g., 187V), can be used as the first critical value. Since the maximum overshoot temperature obtained in this way is usually lower than the temperature measured at the rated voltage, it is easier to ensure accuracy and less likely to be missed.

[0064] Due to the presence of the intermediate medium (i.e., the aforementioned case where the heating roller contains paper), the temperature sensor delays detecting the temperature of the heat source, resulting in a relatively long heating time and a higher peak temperature after heating stops compared to when there is no intermediate medium. Specifically, when there is no intermediate medium, the temperature detected by the temperature sensor can be considered close to the actual temperature of the heating roller surface. However, when there is an intermediate medium, because the medium is between the heating roller and the temperature sensor, the actual temperature detected by the temperature sensor is lower than the actual temperature of the heating roller surface due to the isolation caused by the medium. This means that when the heating roller surface has reached the T0 temperature at which heating should be stopped, the temperature sensor detects that the temperature has not yet reached T0. Therefore, the controller continues to heat the heating roller. By the time the temperature sensor detects the T0 temperature, the actual surface temperature of the heating roller has exceeded the safe temperature, and the peak temperature detected by the temperature sensor after heating stops is also higher than the peak temperature when there is no intermediate medium. That is, the second critical value T2 is greater than the first critical value T1.

[0065] This embodiment sets the warning temperature value between the first and second critical values, accommodating both cases where the heating roller contains paper and cases where it does not. Since the warning temperature value is greater than the first critical value, it provides a corresponding margin for detecting temperature anomalies within the permissible temperature range of the heating roller surface. Within this margin, the heated portion of the heating roller surface will not damage other components of the fuser or itself, while also reducing false alarms. The warning temperature value is less than the second critical value to prevent the paper or other media from reaching their carbonization or even combustion points, thus avoiding carbonization or even combustion. Therefore, setting the warning temperature value below the second critical value avoids issuing an alarm only after carbonization or combustion has occurred.

[0066] Furthermore, the aforementioned first fixing anomaly can be addressed in conjunction with an emergency handling system. The alarm for the first fixing anomaly can be triggered by sound or light to alert the operator to an emergency situation within the equipment. Upon the occurrence of an emergency, the emergency handling system stops the printing process and can also prevent further deterioration of the abnormal temperature by immediately cutting off power to the fuser or even the entire equipment. Alternatively, it can extinguish the fire by releasing fire-extinguishing or cooling gases or extracting internal air. All of these actions fall within the scope of this invention.

[0067] In another embodiment, considering the possibility of a momentary temperature detection anomaly by the temperature sensor, the first fixing anomaly can also be a pre-alarm operation, that is, only the alarm function is executed, but the emergency braking operation is not executed, while the emergency braking operation is executed based on the judgment condition of the second fixing anomaly.

[0068] The following describes the judgment conditions for the second fixing abnormality under this embodiment of the present invention.

[0069] This judgment condition is based on the aforementioned fixing identification method. When the surface temperature of the heating roller reaches the warning temperature value, while continuing to monitor the surface temperature of the heating roller in real time, it begins to record the duration for which the surface temperature remains above the warning temperature value. Simultaneously, it determines whether this duration is greater than or equal to a preset time value. If the duration is greater than or equal to the preset time value, it indicates that an abnormality has occurred on the surface of the heating roller, and a second fixing anomaly has been identified. Under this judgment condition, false alarms caused by instantaneous temperature detection anomalies can be eliminated, ensuring the accuracy of fixing anomaly identification.

[0070] The real-time monitoring of the surface temperature of the heating roller can be achieved by a temperature sensor installed on the surface of the heating roller. The temperature sensor can be a thermistor for temperature detection. Of course, other electronic temperature detection components can also be used for the temperature sensor, which will not be elaborated here.

[0071] Therefore, the above method is incorporated into step S2 and subsequent steps of this fixing anomaly identification method, as described above. Figure 6 The following steps are obtained:

[0072] Step S2: Determine whether the surface temperature has reached the warning temperature value. If the surface temperature of the heating roller reaches the warning temperature value, determine that the first fixing abnormality has occurred, and record the duration when the surface temperature is greater than or equal to the warning temperature value.

[0073] Step S3: Determine whether the duration is greater than or equal to the preset time value. If the duration is greater than or equal to the preset time value, then determine that a second fixing abnormality has occurred.

[0074] Furthermore, the recording process of the duration after the surface temperature of the heating roller reaches the warning temperature value can be achieved through a time storage device or a counter. The time storage device can directly obtain the duration after the surface temperature of the heating roller reaches the warning temperature value when recording the duration. For example, if the duration is set to t and the preset time value is t0, if the equation t≥t0 is satisfied, it can be determined that a second fixing anomaly has occurred.

[0075] In another approach, if the duration is calculated using a counter, it can be achieved as follows: The duration when the surface temperature is greater than or equal to the warning temperature value is counted at a preset time interval. Let the duration be t, the preset time interval be Δt, and the counter count value within the duration be X. Then the duration t can be obtained using the following equation: t = Δt * X. Under the above conditions, if the preset duration is set to t0, the preset count value X0 can be obtained by X0 = t0 / Δt. In this case, the preset time value can be either t0 or the preset count value X0. When using the count value X0, after the counter reaches the preset count value X0 during the counting process, it can be determined that the duration t ≥ t0, indicating a second fixing anomaly. It should be noted that the preset time value in this embodiment is the criterion for determining the occurrence of a second fixing anomaly.

[0076] Furthermore, prior to step S1 of the fixing anomaly identification method, a preliminary step of real-time monitoring of the activation conditions may be included, which includes:

[0077] Determine whether the surface temperature has reached the preheating temperature value;

[0078] When the surface temperature reaches the preheating temperature value, it is determined that the heating roller has entered the ready stage from the preheating stage, and the real-time monitoring of the surface temperature of the heating roller is executed.

[0079] In the preceding steps, the sampling interval for acquiring real-time monitoring data can be longer than the time interval used in the subsequent step S1. Alternatively, the judgment time point for comparing the surface temperature with the preheating temperature value can be determined by the heating time of the heating source. Both are within the scope of this invention and can save detection resources and extend the service life of the temperature sensor to a certain extent. Of course, the time interval for temperature detection can also be the same as the monitoring interval for the surface temperature of the heating roller in the subsequent real-time monitoring, and is not limited here.

[0080] When the heating roller transitions from the preheating stage to the ready stage, heating can be stopped by controlling the heat source within the heating roller to prevent overheating from damaging the recording material or even causing an accident. Alternatively, the heating power of the heat source can be reduced to maintain the heating temperature of the heating roller, thus meeting the fixing requirements; this is not a specific method described here.

[0081] To enable the execution of the method provided in Embodiment 1 on an image forming device, this embodiment of the invention also proposes a fixing anomaly recognition program, which is described in detail below.

[0082] See Figure 5 This is a flowchart of the fixing anomaly recognition process implemented in Embodiment 1 of the present invention to achieve the aforementioned method. The fixing anomaly recognition program can be executed in a computer, which is a computer or processing system built into an image forming device, a print driver device, etc. When the fixing anomaly recognition program is executed, it mainly includes the following steps:

[0083] S101: Obtain real-time temperature data T3 of the heating roller surface.

[0084] During the acquisition of real-time temperature data T, the temperature sensor can continuously detect the surface temperature of the heating roller in real time at short intervals (e.g., 100ms as a cycle) and send the monitored real-time temperature data T3 to the computer.

[0085] S102: Determine whether the real-time temperature data T3 has reached the warning temperature value T. If the real-time temperature data T3 is greater than or equal to the warning temperature value T, it means that the temperature of the heating roller surface has reached or exceeded the warning temperature value T. At this time, it is determined that a fixing abnormality has occurred, and proceed to S103. If the real-time temperature data T3 is less than the warning temperature value T, continue to acquire the real-time temperature data T3 of the heating roller surface to continuously monitor the surface temperature of the heating roller.

[0086] S103: Output the judgment result of the first fixing anomaly.

[0087] It should be noted that the result of the first fixing abnormality judgment can be output to the alarm device and the emergency handling system. The alarm device will issue an alarm in the form of sound and light, and the emergency handling system will stop the printing process from continuing.

[0088] Further reading Figure 7 In step S102 of this embodiment of the invention, if the real-time temperature data T3 is greater than or equal to the warning temperature value T, in addition to outputting the judgment result of the first fixing anomaly, according to the embodiment of the above identification method, a second fixing anomaly judgment is added, which also includes the following steps:

[0089] S104: Send a timing start command to the timing unit to start timing, and proceed to S105.

[0090] The timing unit can be a time memory or a counter, and the electronic modules used to calculate time are all within the scope of this embodiment.

[0091] S105: Continue to acquire real-time temperature data T3, and simultaneously acquire real-time timing data t3 from the timing unit.

[0092] S106: Determine whether the real-time timing data t3 of the timing unit is greater than the preset time value t. If the real-time timing data t3 is greater than or equal to the preset time value t, proceed to S107; if the real-time timing data t3 is less than the preset time value t, proceed to S108.

[0093] During the judgment process, if the timing unit uses a time memory to record the duration, the preset time value t is t0 as mentioned above; if the timing unit uses a counter interval recording method, the preset time value t can be X0, and the real-time timing data t3 is the current count value X of the counter. The duration is determined by comparing the values ​​between X and X0. In addition, the preset time value t can also be t0. When the preset time value t is t0, an additional calculation step t3 = Δt * X is required to obtain the real-time timing data t3 of the duration, where X is the current count value of the counter.

[0094] S107: Output the judgment result of the second fixing anomaly.

[0095] This judgment result can accurately identify an abnormal temperature inside the fuser, and contact the emergency handling system via command or signal to stop the printing process, preventing further escalation of the overheating hazard. Upon receiving this result, both a first and a second fuser anomaly are output, accurately identifying the abnormality of the heating roller inside the fuser, preventing false alarms, and effectively eliminating the risk of unexpected deterioration.

[0096] S108: If the real-time temperature data T3 is greater than or equal to the warning temperature value T, return to S105 and continue to calculate the duration; if the real-time temperature data T3 is less than the warning temperature value T, proceed to S109.

[0097] S109: Send a timing stop command to the timing unit to stop timing, return to S101, and continue monitoring the surface temperature of the heating roller.

[0098] In S109, it can be determined that the temperature anomaly is a short-term anomaly, that is, a situation in which only the first fixing anomaly is emitted, which serves as a warning.

[0099] Alternatively, in the above steps, if the first fixing abnormality occurs, the output of the first fixing abnormality result can be changed to the printing drive device to stop the printing process and deal with the temperature abnormality in advance. If the second fixing abnormality occurs, emergency measures such as powering off the entire image forming equipment can be taken to prevent the temperature abnormality from worsening further.

[0100] Before step S101, a preliminary step S100 for identifying the conditions for starting the method may also be included, as follows:

[0101] S100: Obtain the real-time temperature data T3 on the surface of the heating roller, determine whether the real-time temperature data T3 has reached the preheating temperature value T0, if the real-time temperature data T3 is greater than or equal to the preheating temperature value T0, then determine that the heating roller has entered the ready stage from the preheating stage, continue to obtain the real-time temperature data T3 on the surface of the heating roller, and enter S101.

[0102] The real-time temperature data T3 can be transmitted to the computer via a continuously monitored temperature sensor. The transition of the heating roller from the preheating stage to the ready stage means that after the heating roller has finished preheating, the print driver within the image forming equipment can issue a paper feed command to allow the recording material to enter the fuser for heating and fixing.

[0103] Correspondingly, embodiments of the present invention also provide a fixing anomaly identification device, disposed within the fixing control unit. See details. Figure 11 The fixing anomaly detection device 700 includes the following modules:

[0104] The monitoring module 720 is used to monitor the surface temperature of the heating roller in real time and obtain real-time temperature data of the heating roller surface for subsequent judgment modules to identify and judge anomalies.

[0105] The first temperature judgment module 730 is used to determine whether the surface temperature has reached the warning temperature value;

[0106] The first anomaly detection module 740 is used to detect a first fixing anomaly when the surface temperature of the heating roller reaches the warning temperature value.

[0107] It should be noted that the warning temperature value has been specifically described in the aforementioned embodiments, and will not be repeated here.

[0108] In practice, the detection module acquires real-time temperature data of the surface of the heating roller and transmits the data to the first temperature judgment module 730. The first temperature judgment module 730 compares the real-time temperature data with the warning temperature value. When the surface temperature of the heating roller reaches the warning temperature value, the first anomaly judgment module 740 determines that a first fixing anomaly has occurred in the fuser.

[0109] In one possible design of this embodiment, it also includes:

[0110] The timing module 750 is used to record the duration when the surface temperature of the heating roller is greater than or equal to the warning temperature value.

[0111] The time determination module 760 is used to determine whether the duration is greater than or equal to a preset time value;

[0112] The second anomaly detection module 770 is used to determine that a second fixing anomaly has occurred when the duration is greater than or equal to a preset time.

[0113] The above module is used to determine the second fixing abnormality based on the identification of the first fixing abnormality. After the first abnormality judgment module 740 determines that the first fixing abnormality has occurred, the timing module 750 records the duration for which the surface temperature of the heating roller reaches the warning temperature value. The time judgment module 760 determines whether the duration is greater than or equal to the preset time value. If the duration is greater than or equal to the preset time value, the second abnormality judgment module 770 determines that the second fixing abnormality has occurred.

[0114] In another possible design of this embodiment, it also includes:

[0115] The second temperature judgment module 780 is used to determine whether the surface temperature is lower than the warning temperature value when the duration is less than the preset time value. If the surface temperature is lower than the warning temperature value, a timing stop command is sent to the timing module 750. At this time, the first fixing abnormality occurs in the fixing device but the second fixing abnormality does not occur.

[0116] In addition, a pre-execution module 710 is included. The pre-execution module 710 is used to determine that the heating roller has entered the ready stage from the preheating stage when the surface temperature reaches the preheating temperature value, and to enable the monitoring module 720 to start monitoring the surface temperature of the heating roller in order to identify and judge fixing abnormalities.

[0117] Example 2

[0118] In other embodiments of the present invention, a fixing anomaly identification method is provided, executed in a fixing control unit. The fixing control unit can be a control component in the aforementioned fuser, or a print drive device on an image forming device; no limitation is made herein. See also... Figure 8The method includes:

[0119] Step S1: Monitor the surface temperature of the heating roller in real time;

[0120] Step S2: Determine whether the surface temperature has reached the warning temperature value. If the surface temperature of the heating roller reaches the warning temperature value, record the duration when the surface temperature is greater than or equal to the warning temperature value.

[0121] Step S3: Determine whether the duration is greater than or equal to the preset time value. If the duration is greater than or equal to the preset time value, it is determined that a fixing abnormality has occurred.

[0122] Compared with the anomaly identification method in Embodiment 1, the anomaly identification method in this embodiment adds a judgment condition to determine whether the duration of the surface temperature reaching the warning temperature value is greater than a preset time value. That is, the judgment result of the second fixing anomaly in Embodiment 1 is used as the anomaly judgment result in this embodiment, so that this embodiment can accurately and comprehensively identify the abnormal surface temperature of the heating roller and take corresponding emergency measures.

[0123] In this embodiment, the warning temperature value is greater than the first critical value and less than the second critical value, which is the same range as that in Embodiment 1. (See reference...) Figure 3 .

[0124] The process of recording the duration after the surface temperature of the heating roller reaches the warning temperature value can be achieved through a time storage device or a counter. The time storage device can directly obtain the duration after the surface temperature of the heating roller reaches the warning temperature value when recording the duration. For example, if the duration is set to t and the preset time value is t0, if the equation t≥t0 is satisfied, it can be determined that a fixing abnormality has occurred.

[0125] In another approach, if the duration is calculated using a counter, it can be achieved as follows: The duration when the surface temperature is greater than or equal to the warning temperature value is counted at a preset time interval. Let the duration be t, the preset time interval be Δt, and the counter count value within the duration be X. Then the duration t can be obtained using the following equation: t = Δt * X. Under the above conditions, if the preset duration is set to t0, the preset count value X0 can be obtained by X0 = t0 / Δt. In this case, the preset time value can be either t0 or the preset count value X0. When using the count value X0, if the counter reaches the preset count value X0 during the counting process, it can be determined that the duration t ≥ t0, indicating a fixing anomaly. It should be noted that the preset time value in this embodiment is the criterion for determining the occurrence of a fixing anomaly.

[0126] Furthermore, prior to step S1 of the fixing anomaly identification method, a preliminary step of real-time monitoring of the start-up conditions may be included. This preliminary step includes: determining whether the surface temperature has reached the preheating temperature value; when the surface temperature reaches the preheating temperature value, determining that the heating roller has entered the ready stage from the preheating stage, and proceeding to the next step of real-time monitoring of the surface temperature of the heating roller. This aforementioned step has already been described in Embodiment 1 and will not be repeated here.

[0127] To enable the execution of the method provided in Embodiment 2 on an image forming device, this embodiment of the invention also proposes a fixing anomaly recognition program, which is described in detail below.

[0128] See Figure 9 This is a flowchart of the fixing anomaly recognition process implemented in Embodiment 2 of the present invention to achieve the aforementioned method. The fixing anomaly recognition program can be executed in a computer, which is a computer or processing system built into an image forming device, a print driver device, etc. When the fixing anomaly recognition program is executed, it mainly includes the following steps:

[0129] S201: Obtain real-time temperature data T3 of the heating roller surface.

[0130] During the acquisition of real-time temperature data T, the temperature sensor can detect the surface temperature of the heating roller in real time at short intervals (e.g., 200ms as a cycle) and send the monitored real-time temperature data T3 to the computer.

[0131] S202: Determine whether the real-time temperature data T3 has reached the warning temperature value T. If the real-time temperature data T3 is greater than or equal to the warning temperature value T, it means that the temperature of the heating roller surface has reached or exceeded the warning temperature value T, and proceed to S203. If the real-time temperature data T3 is less than the warning temperature value T, continue to acquire the real-time temperature data T3 of the heating roller surface to continuously monitor the surface temperature of the heating roller.

[0132] S203: Send a timing start command to the timing unit, timing begins, and proceed to S204.

[0133] S204: Continue to acquire real-time temperature data T3, and simultaneously acquire real-time timing data t3 from the timing unit, then proceed to S206.

[0134] S205: Determine whether the real-time timing data t3 of the timing unit is greater than the preset time value. If the real-time timing data t3 is greater than or equal to the preset time value t, proceed to S206; if the real-time timing data t3 is less than the preset time value t, proceed to S207.

[0135] During the judgment process, if the timing unit uses a time memory to record the duration, the preset time value t is t0 as mentioned above; if the timing unit uses a counter interval recording method, the preset time value t can be X0, and the real-time timing data t3 is the current count value X of the counter. The duration is determined by comparing the values ​​between X and X0. In addition, the preset time value t can also be t0. When the preset time value t is t0, an additional calculation step t3 = Δt * X is required to obtain the real-time timing data t3 of the duration, where X is the current count value of the counter.

[0136] S206: Output the judgment result of fixing abnormality.

[0137] This judgment result can accurately identify an abnormal temperature inside the fuser and, through commands or signals, contact the emergency handling system or print drive to stop the printing process, preventing further deterioration of the overheating hazard.

[0138] S207: If the real-time temperature data T3 is greater than or equal to the warning temperature value T, then return to S204 and continue to calculate the duration; if the real-time temperature data T3 is less than the warning temperature value T, then proceed to S208.

[0139] S208: Send a timing stop command to the timing unit to stop timing, return to S201, and continue monitoring the surface temperature of the heating roller.

[0140] Similar to Example 1, before step S201, a preliminary step S200 for identifying the conditions for starting the method may be included, as follows:

[0141] S200: Obtain the real-time temperature data T3 on the surface of the heating roller, determine whether the real-time temperature data T3 has reached the preheating temperature value T0, if the real-time temperature data T3 is greater than or equal to the preheating temperature value T0, then determine that the heating roller has entered the ready stage from the preheating stage, continue to obtain the real-time temperature data T3 on the surface of the heating roller, and enter S201.

[0142] The real-time temperature data T3 can be transmitted to the computer via a continuously monitored temperature sensor. The transition of the heating roller from the preheating stage to the ready stage means that after the heating roller has finished preheating, the print driver within the image forming equipment can issue a paper feed command to allow the recording material to enter the fuser for heating and fixing.

[0143] Correspondingly, embodiments of the present invention also provide a fixing anomaly identification device, disposed within the fixing control unit. See details. Figure 12 The fixing anomaly detection device 700 includes the following modules:

[0144] The monitoring module 720 is used to monitor the surface temperature of the heating roller in real time and obtain real-time temperature data of the heating roller surface for subsequent judgment modules to identify and judge anomalies.

[0145] The first temperature judgment module 730 is used to determine whether the surface temperature has reached the warning temperature value;

[0146] The timing module 750 is used to record the duration when the surface temperature of the heating roller is greater than or equal to the warning temperature value.

[0147] The time determination module 760 is used to determine whether the duration is greater than or equal to a preset time value;

[0148] The anomaly detection module is used to determine if a fixing anomaly has occurred when the duration is greater than or equal to a preset time.

[0149] The second temperature judgment module 780 is used to determine whether the surface temperature is lower than the warning temperature value when the duration is less than the preset time value. If the surface temperature is lower than the warning temperature value, a timing stop command is sent to the timing module 750.

[0150] It should be noted that the warning temperature value has been specifically described in the aforementioned embodiments, and will not be repeated here.

[0151] In practice, the monitoring module 720 acquires the surface temperature of the heating roller in real time, the first temperature judgment module 730 determines whether the surface temperature has reached the warning temperature value, when the surface temperature reaches the warning temperature value, the timing module 750 starts recording the duration for which the surface temperature is greater than or equal to the warning temperature value, and the time judgment module 760 compares the duration with the preset time value. When the duration is greater than or equal to the preset time value, the anomaly judgment module determines that a second fixing anomaly has occurred, and at the same time the second temperature judgment module 780 determines whether the surface temperature is less than the warning temperature value. If the surface temperature is less than the warning temperature value, a timing stop command is sent to the timing module 750.

[0152] In another possible design of this embodiment, it also includes:

[0153] It also includes a pre-execution module, which determines that the heating roller has entered the ready stage from the preheating stage when the surface temperature reaches the preheating temperature value, and causes the monitoring module 720 to start monitoring the surface temperature of the heating roller in order to identify and judge fixing abnormalities.

[0154] Corresponding to the aforementioned fixing anomaly identification method and program embodiments, this invention also provides a control unit. (See attached document) Figure 10 The diagram below illustrates the structure of a control unit provided in this application embodiment, which mainly includes the following modules:

[0155] The memory 610 is used to store programs and other data;

[0156] Processor 620 is used to process instructions, process information and data, control timing, and execute application programs, etc.

[0157] A computer program, stored in memory 610, is configured to be executed by processor 620 to implement the methods in embodiments 1 and 2 described above.

[0158] The computer program can be the fixing anomaly identification program proposed in Embodiment 1 or Embodiment 2. During the execution process, preset data such as preset preheating temperature value, warning temperature value, preset time value, and preset time interval can be stored in memory 610 before leaving the factory. When the computer program is called, the preset data in memory 610 is called to ensure the smooth progress of the fixing anomaly identification process.

[0159] Furthermore, the processor 620 may include the following modules:

[0160] The acquisition module is used to acquire real-time temperature data and real-time timing data;

[0161] The processing module is used to call the program and data in the memory 610, and to determine whether the real-time temperature is greater than or equal to the warning temperature value and whether the real-time timing data is greater than or equal to the preset time value based on the acquired real-time temperature data and real-time timing data.

[0162] The transmitting module is used to send timing start and timing stop commands to the timing unit, send commands to the temperature sensor to continue execution, and output abnormal identification signals to the alarm device or emergency handling system.

[0163] The timing unit can be a timing module built into the processor 620, or an external timer or counter, which is not limited here. It responds to the timing start command and timing stop command and sends real-time timing data to the processor 620.

[0164] In this embodiment, the control unit may also be other electronic devices used to implement the fixing anomaly identification method in this embodiment of the invention, such as a printing drive device, a fixing drive device, etc., which are also within the scope of this invention.

[0165] In conjunction with the aforementioned fuser, the control components on the fuser include the aforementioned control unit, which is used to receive the actual temperature data of the detection component and determine whether the fusing process is abnormal.

[0166] Furthermore, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor 620, implements the fixing anomaly identification method as mentioned in the embodiments.

[0167] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fixing anomaly identification method, executed in a fixing control unit, characterized in that, include: Real-time monitoring of the surface temperature of the heating roller; Determine whether the surface temperature has reached the warning temperature value; If the surface temperature of the heating roller reaches the warning temperature value, it is determined that the first fixing abnormality has occurred; Wherein, the warning temperature value is greater than a first critical value and less than a second critical value, the first critical value is the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second critical value is the maximum overshoot temperature of the heating roller when there is medium in the fuser; The method further includes a preliminary step prior to the real-time monitoring of the surface temperature of the heating roller, the preliminary step including: Determine whether the surface temperature has reached the preheating temperature value; When the surface temperature reaches the preheating temperature value, it is determined that the heating roller has entered the ready stage from the preheating stage, and the real-time monitoring of the surface temperature of the heating roller is executed.

2. The method according to claim 1, characterized in that, If the surface temperature of the heating roller reaches the warning temperature value, the method further includes the following steps: Record the duration during which the surface temperature is greater than or equal to the warning temperature value; Determine whether the duration is greater than or equal to a preset time value; If the duration is greater than or equal to the preset time value, it is determined that a second fixing anomaly has occurred.

3. The method according to claim 2, characterized in that, The recording of the duration for which the surface temperature is greater than or equal to the warning temperature value includes: counting the duration for which the surface temperature is greater than or equal to the warning temperature value at preset time intervals. The preset time value is a preset count value.

4. A fixing anomaly identification method, executed in a fixing control unit, characterized in that, include: Real-time monitoring of the surface temperature of the heating roller; Determine whether the surface temperature has reached the warning temperature value; If the surface temperature of the heating roller reaches the warning temperature value, record the duration when the surface temperature is greater than or equal to the warning temperature value. Determine whether the duration is greater than or equal to a preset time value; If the duration is greater than or equal to the preset time value, it is determined that a fixing abnormality has occurred; Wherein, the warning temperature value is greater than a first critical value and less than a second critical value, the first critical value is the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second critical value is the maximum overshoot temperature of the heating roller when there is medium in the fuser; The method further includes a preliminary step prior to the real-time monitoring of the surface temperature of the heating roller, the preliminary step including: Determine whether the surface temperature has reached the preheating temperature value; When the surface temperature reaches the preheating temperature value, it is determined that the heating roller has entered the ready stage from the preheating stage, and the real-time monitoring of the surface temperature of the heating roller is executed.

5. The method according to claim 4, characterized in that, The recording of the duration for which the surface temperature is greater than or equal to the warning temperature value includes: counting the duration for which the surface temperature is greater than or equal to the warning temperature value at preset time intervals. The preset time value is a preset count value.

6. A fixing anomaly detection device, disposed in a fixing control unit, characterized in that, include: The monitoring module is used to monitor the surface temperature of the heating roller in real time. The first temperature judgment module is used to determine whether the surface temperature has reached the warning temperature value; as well as The first anomaly detection module is used to determine that a first fixing anomaly has occurred when the surface temperature of the heating roller reaches the warning temperature value. Wherein, the warning temperature value is greater than a first critical value and less than a second critical value, the first critical value is the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second critical value is the maximum overshoot temperature of the heating roller when there is medium in the fuser; The device further includes a pre-execution module, which is used to determine that the heating roller has entered the ready stage from the preheating stage when the surface temperature reaches the preheating temperature value, and to cause the monitoring module to start monitoring the surface temperature of the heating roller.

7. The fixing anomaly identification device according to claim 6, characterized in that, Also includes: The timing module is used to record the duration when the surface temperature of the heating roller is greater than or equal to the warning temperature value. The time determination module is used to determine whether the duration is greater than or equal to a preset time value; The second anomaly detection module is used to determine that a second fixing anomaly has occurred when the duration is greater than or equal to the preset time value.

8. The fixing anomaly identification device according to claim 7, characterized in that, Also includes: The second temperature judgment module is used to determine whether the surface temperature is less than the warning temperature value when the duration is less than the preset time value. If the surface temperature is less than the warning temperature value, a timing stop command is sent to the counting module.

9. A fixing anomaly detection device, disposed in a fixing control unit, characterized in that, include: The monitoring module is used to monitor the surface temperature of the heating roller in real time. The first temperature judgment module is used to determine whether the surface temperature has reached the warning temperature value; The timing module is used to record the duration when the surface temperature of the heating roller is greater than or equal to the warning temperature value. The anomaly detection module is used to determine that a fixing anomaly has occurred when the duration is less than or equal to a preset time value; as well as The second temperature judgment module is used to determine whether the surface temperature is less than the warning temperature value when the duration is less than the preset time value. If the surface temperature is less than the warning temperature value, a timing stop command is sent to the timing module. Wherein, the warning temperature value is greater than a first critical value and less than a second critical value, the first critical value is the maximum overshoot temperature of the heating roller when there is no medium in the fuser, and the second critical value is the maximum overshoot temperature of the heating roller when there is medium in the fuser; The device further includes a pre-execution module, which is used to determine that the heating roller has entered the ready stage from the preheating stage when the surface temperature reaches the preheating temperature value, and to cause the monitoring module to start monitoring the surface temperature of the heating roller.

10. A control unit, characterized in that, include: Memory; processor; as well as Computer programs; The computer program is stored in the memory and configured to be executed by the processor to implement the method according to any one of claims 1 to 5.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a computer program that, when executed, controls the device containing the computer-readable storage medium to perform the method according to any one of claims 1 to 5.

12. A fuser, characterized in that, include: A heating roller is configured to heat the recording material; A drive assembly is configured to drive the recording material through the heating roller; The detection component is configured to detect the surface temperature on the heating roller and output real-time temperature data; The control component, including the control unit as claimed in claim 10, is configured to receive real-time temperature data from the detection component and determine whether the fixing process is abnormal.

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