Printing control method and image forming device

Abstract

The invention discloses a print control method and an image forming apparatus, the image forming apparatus including a fixing device, the method including: executing a print job; acquiring a current temperature of an end portion of the fixing device; judging whether the current temperature is greater than or equal to a preset first threshold value; if the current temperature is greater than or equal to the first threshold value, switching to a first printing mode; the method further comprises the steps of judging whether the actual paper type is the first type or not according to the paper length detection result, and switching to the second printing mode if the actual paper type is the first type. According to the control method, different printing control is carried out according to the temperature of the end part of the fixing device, actual paper type judgment and the like in combination with switching of the corresponding printing modes, so that the current abnormal printing state can be accurately identified in a possible abnormal printing scene, the printing temperature is timely controlled, and the printing efficiency is improved. Therefore, the reliability and safety of the fixing device are greatly improved, and the situation that parts at the end of the fixing device are damaged due to over-temperature during abnormal printing is prevented.

Description

Technical Field

[0001] The present invention relates to the field of electronic imaging technology, and particularly to a printing control method and an image forming apparatus. Background Art

[0002] Image forming apparatuses such as printers and copiers include a fixing device. Under high temperature and high pressure, the fixing device melts the developer (toner) and infiltrates it into the gaps of the paper fibers to achieve the purpose of fixing the toner and printing the paper. According to the actual situation of the paper heating function, the fixing device needs to detect the temperature of the heating component and complete the feedback and control actions; according to the actual situation of the paper conveying function in the image forming apparatus, a paper head front sensor, a paper tail discharge sensor, and a paper width (paper format) sensor are arranged structurally to meet the requirements of detection, feedback, control, etc. in the paper conveying function.

[0003] According to the relevant requirements of product design, there are differences in aspects such as the presence or absence of a paper width (paper format) sensor arrangement in the overall structure of the image forming apparatus and the configuration of one or more temperature sensors in the fixing device.

[0004] Taking the example of a fixing device configured with two temperature sensors at the center (middle) and the end (side), and no paper width (paper format) sensor on the paper conveying path in the image forming apparatus; the following problems exist:

[0005] · When the user normally prints narrow paper, the temperature at the end of the fixing device outside the paper passing range will rise. If the end temperature rises too high, the components of the fixing device will be damaged.

[0006] · When the user issues a print job for wide paper (such as A4), but actually uses narrow paper incorrectly (such as A4 cut in half along the short side) in the case of an image forming apparatus without a paper width sensor, the image forming apparatus cannot recognize that the user has used the wrong paper, and the image forming apparatus will perform high-speed printing according to the wide paper set by the user. In this case, the temperature at the end of the fixing device will rise rapidly, resulting in damage to the fixing device.

[0007] · In actual use, there are many cases where an A4 task is printed on the short side of A5 or A6 (the actual paper placed is the short side of A5 or A6). The user requires normal printing in this scenario, but when performing high-speed printing at the speed of A4 and the actual paper used is small paper, the temperature at the end of the fixing device will rise too high, posing a safety problem. Summary of the Invention

[0008] According to one aspect of the present invention, there is provided a printing control method, which is executed on an image forming apparatus, the image forming apparatus including a fixing device, and the method includes:

[0009] Execute a print job;

[0010] Obtain the current temperature at the end of the fixing device;

[0011] Determine whether the current temperature is greater than or equal to a preset first threshold;

[0012] When the current temperature is greater than or equal to the first threshold, switch to the first printing mode.

[0013] In some embodiments, the first printing mode includes:

[0014] Adjust the paper spacing according to the current temperature.

[0015] In some embodiments, the adjusting the paper spacing according to the current temperature includes:

[0016] Determine the temperature range according to the current temperature;

[0017] Adjust to the corresponding paper spacing according to the corresponding relationship between the preset temperature range and the paper spacing.

[0018] In some embodiments, the corresponding relationship between the preset temperature range and the paper spacing includes: the farther the temperature range is from the first threshold, the larger the corresponding paper spacing.

[0019] In some embodiments, when the current temperature is greater than a preset second threshold, stop executing the printing job.

[0020] In some embodiments, the second threshold is the maximum value of the temperature range farthest from the first threshold.

[0021] In some embodiments, it further includes that when the current temperature drops from greater than the second threshold to a third threshold, resume executing the printing job, where 0 ≤ third threshold < second threshold.

[0022] In some embodiments, when the current temperature is greater than the preset first threshold, it includes:

[0023] Judge whether the actual paper type is the first type according to the paper length detection result.

[0024] In some embodiments, the judging whether the actual paper type is the first type according to the paper length detection result further includes:

[0025] If the actual paper type is the first type, switch to the second printing mode.

[0026] In some embodiments, the second printing mode includes:

[0027] Determine the actual paper type being currently printed according to the paper length detection result, and adjust the paper spacing to the paper spacing corresponding to the actual paper type for printing.

[0028] In some embodiments, the second printing mode further includes:

[0029] Reducing the printing line speed of the image forming apparatus.

[0030] In some embodiments, if the actual paper type is not the first type, a paper type mismatch prompt is issued and the printing job is stopped.

[0031] According to one aspect of the present invention, another printing control method is provided, which is executed in an image forming apparatus, and the image forming apparatus includes a fixing device. The method includes:

[0032] Executing a printing job;

[0033] Judging whether the actual paper type is the first type according to the paper detection result;

[0034] If the actual paper type is the first type, switch to the second printing mode.

[0035] In some embodiments, the second printing mode includes:

[0036] According to the paper length detection result, determine the actual paper type being printed, and adjust the paper spacing to the paper spacing corresponding to the actual paper type for printing.

[0037] In some embodiments, the second printing mode further includes:

[0038] Reducing the printing line speed of the image forming apparatus.

[0039] In some embodiments, if the actual paper type is not the first type, a paper type mismatch prompt is issued and the printing job is stopped.

[0040] In some embodiments, it further includes:

[0041] Obtaining the current temperature of the end of the fixing device;

[0042] Judging whether the current temperature is greater than or equal to a preset first threshold;

[0043] If the current temperature is greater than or equal to the first threshold, switch to the first printing mode.

[0044] In some embodiments, the first printing mode includes:

[0045] Adjusting the paper spacing according to the current temperature.

[0046] In some embodiments, the adjusting the paper spacing according to the current temperature includes:

[0047] Determine the temperature range based on the current temperature;

[0048] Adjust to the corresponding paper spacing according to the corresponding relationship between the preset temperature range and the paper spacing.

[0049] In some embodiments, the corresponding relationship between the preset temperature range and the paper spacing includes: the farther the temperature range is from the first threshold, the larger the corresponding paper spacing.

[0050] In some embodiments, if the current temperature is greater than the preset second threshold, stop executing the printing job.

[0051] In some embodiments, the second threshold is the maximum value of the temperature range that is farthest from the first threshold.

[0052] In some embodiments, it further includes that if the current temperature decreases from greater than the second threshold to the third threshold, resume executing the printing job, where 0 ≤ third threshold < second threshold.

[0053] According to another aspect of the present invention, there is provided an image forming apparatus, including a fixing device, and a temperature sensor for collecting the current temperature of the end of the fixing device is provided at the end of the fixing device;

[0054] The image forming apparatus executes the printing control method as described in any one of the above.

[0055] Advantages of the present invention: The control method of the present invention combines the temperature at the end of the fixing device, actual paper type judgment, etc. to switch the corresponding printing mode for different printing controls, enabling accurate identification of the current abnormal printing state in possible abnormal printing scenarios, timely controlling the printing temperature, thereby greatly improving the reliability and safety of the fixing device, and preventing the overheating damage of the components at the end of the fixing device during abnormal printing. Description of the Drawings

[0056] Figure 1 Schematic diagram of the internal structure of the image forming apparatus according to some embodiments of the present invention;

[0057] Figure 2 Schematic diagram of the structure of the fixing device according to some embodiments of the present invention;

[0058] Figure 3 Flowchart of executing the printing job according to some embodiments of the present invention;

[0059] Figure 4 Flow block diagram of the printing control method according to some embodiments of the present invention;

[0060] Figure 5Flow chart of the first printing mode of the printing control method according to some embodiments of the present invention;

[0061] Figure 6 Correspondence table between temperature ranges and paper spacings according to some embodiments of the present invention;

[0062] Figure 7 Flow chart of the printing control for executing the first printing mode according to some embodiments of the present invention;

[0063] Figure 8 Flow chart of the control method after determining whether the paper type is the first type according to some embodiments of the present invention;

[0064] Figure 9 Flow chart of the second printing mode according to some embodiments of the present invention;

[0065] Figure 10 Flow chart of the printing control method according to other embodiments of the present invention. Detailed implementation manners

[0066] The present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0067] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0070] In the above description, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0071] Figure 1 An image forming apparatus according to some embodiments of the present invention is schematically shown, including a main frame 1, a paper feeding module, a processing cartridge, a laser scanning unit 5, a transfer module, a fixing device, and a paper discharging module. The main frame supports and protects other components. The paper feeding module is located in a paper cassette for storing paper and a paper feeding roller 21. The paper feeding roller 21 is used to take out the paper in the paper cassette and feed it into the paper conveyance path of the image forming apparatus. A plurality of conveyance rollers 31 may also be provided in the main frame 1 for conveying the paper on the paper conveyance path. The processing cartridge includes a toner cartridge, a developing roller 41, and a photosensitive drum 42. The laser beam of the laser scanning unit 5 irradiates the photosensitive drum 42 to form an electrostatic latent image. The developing roller 41 conveys the toner in the toner cartridge to the photosensitive drum 42, and the electrostatic latent image on the photosensitive drum 42 adsorbs the toner to form an image. The transfer module is used to transfer the image on the photosensitive drum 42 onto the paper. The fixing device fixes the toner by heating and pressing so that the toner penetrates into the gaps of the paper fibers, thereby forming a stable image on the paper. The paper discharging module may include a plurality of discharging rollers 71 for discharging the paper after fixing to a tray outside the main frame 1.

[0072] As Figure 1 and Figure 2As shown in the figure, the fixing device includes a heating roller 61 and a pressure roller 62. The heating roller 61 is provided with a heating component 63 (such as a halogen lamp heater, a ceramic heater, an electromagnetic induction heater, etc.), which is used to heat the heating roller 61 to the fixing temperature. The heating roller 61 abuts against the pressure roller 62 and is located on both sides of the paper conveyance path respectively, so that the paper can be heated and pressurized when passing between the heating roller 61 and the pressure roller 62. The axial direction of the heating roller 61 is orthogonal to the paper feeding direction of the paper conveyance path, and the heating component 63 is arranged along the axial direction of the heating roller 61 at the central axis position of the heating roller 61. The fixing device further includes a temperature sensor for obtaining the current temperature of the heating roller 61 during operation. The temperature sensor includes a central temperature sensor 64 and an end temperature sensor 65. The central temperature sensor 64 is used to collect the temperature of the middle region A1 of the heating roller 61 in the axial direction, and the end temperature sensor 65 is used to collect the temperature of one of the end regions A2 of the heating roller 61 in the axial direction. Both the central temperature sensor 64 and the end temperature sensor 65 adopt thermistors, and the current temperature value of the fixing device is obtained by reading the temperature value represented by the current resistance value of the thermistor.

[0073] As Figure 1 shown in the figure, the image forming apparatus further includes a paper leading edge sensor 81 and a paper trailing edge discharge sensor 82 provided on the paper conveyance path. The paper leading edge sensor 81 and the paper trailing edge discharge sensor 82 are used to detect the length of the paper passing through the paper conveyance path (i.e., paper length detection).

[0074] Embodiment 1

[0075] As Figures 3 to 9 shown in the figure, this embodiment provides a printing control method, which is executed in the image forming apparatus and performs printing control based on the current temperature at the end of the fixing device, so that the fixing device can accurately identify the current abnormal printing state in possible abnormal printing scenarios, timely control the printing temperature, and improve the reliability and safety of the fixing device.

[0076] A printing control method of this embodiment includes the following steps:

[0077] As Figure 4 shown in the figure, S100: Execute a printing job.

[0078] Specifically, the image forming apparatus can set corresponding printing states according to print jobs. For example, different printing line speeds are adopted according to different paper types. For instance, high-speed printing is used for printing wide paper (A4 paper), and low-speed printing is used for printing narrow paper or small paper (such as A5, A6 paper, etc.). The printing state also includes adopting different preset paper intervals (initial paper intervals) according to different paper types. The paper interval is to set a waiting interval between two printed papers to avoid overheating of the fixing device caused by continuous printing. The paper interval can be in the form of length or time, and can be mutually converted according to the paper conveying speed of the image forming apparatus. For example, if the initial paper interval Q1 is 400 mm, then according to the paper conveying speed of the image forming apparatus, the time required for the conveyed paper to move 400 mm can be determined as the converted initial paper interval Q1.

[0079] As Figure 3 shown, during the execution of the print job, paper detection is also included, usually detecting the paper length of the first page to be printed. For the detected paper length detection result, the image forming apparatus has an option of whether to turn on the function of ignoring paper type mismatch. Different options have different printing control processes, as specifically shown in the figure. This function is a prior art and will not be described in detail here.

[0080] As Figure 4 shown, S200: Obtain the current temperature T of the end of the fixing device.

[0081] Specifically, after the image forming apparatus starts printing according to the received print job, the current temperature T of the end of the fixing device is collected in real time through the end temperature sensor 65. The current temperature T can be collected once according to a preset period. For example, printing n pages (n≥1) is taken as a period for temperature collection; the preset period can also be time, that is, temperature collection is performed once every m seconds as a period; it can also be a combination of the number of printed pages and time as the preset period for temperature collection.

[0082] As Figure 3 and Figure 4 shown, S300: Determine whether the current temperature T is greater than the first threshold H1.

[0083] When the print job is to print wide paper (A4 paper) and the user also puts A4 paper in the paper tray, when the image forming apparatus performs high-speed printing according to the initial paper interval of wide paper, when the paper passes through the fixing device, it will take away the heat of both the middle area A1 and the end area A2 of the fixing device at the same time. When the current temperature T of the end of the fixing device is less than the first threshold H1 (0≤T<H1), the image forming apparatus can continue to print in the current printing state. After long-term continuous printing, the current temperature T of the end of the fixing device may rise and exceed the first threshold H1.

[0084] When printing narrow or small paper, or when the print job is for wide paper but the user misfeeds and inserts narrow or small paper, as the paper passes through the fixing device, it only passes through the middle area A1, that is, it only takes away the heat of the middle area A1 of the fixing device, and the heat at the ends of the fixing device will accumulate rapidly. The current temperature T at the ends will quickly rise and be greater than the first threshold H1.

[0085] Since different image forming devices have different required temperatures during fixing, the first threshold H1 (temperature value) can be specifically set according to the fixing parameters of the image forming device.

[0086] As Figure 3 and Figure 4 shown, S400: If the current temperature is greater than the preset first threshold, switch to the first printing mode.

[0087] In this embodiment, the first printing mode specifically includes:

[0088] As Figure 3 、 Figures 5 to 7 shown, S410: Adjust the paper pitch according to the current temperature T.

[0089] When the print job issued by the user is to print narrow or small paper, when the current temperature T at the ends of the fixing device is in the temperature range of 0 ≤ T < H1, low-speed printing is performed at the initial paper pitch Q1. After the current temperature T is greater than the first threshold H1, the image forming device increases the paper pitch, making the waiting interval between two sheets of paper larger, so that the rising speed of the current temperature T slows down, and / or enabling the ends of the fixing device to have more time to dissipate heat and reduce the current temperature T.

[0090] Further, S410: Adjust the paper pitch according to the current temperature T, and further includes:

[0091] As Figure 3 、 Figures 5 to 7 shown, S411: Determine the temperature range where it is located according to the current temperature T; adjust to the corresponding paper pitch according to the corresponding relationship between the preset temperature range and the paper pitch.

[0092] In this embodiment, as Figure 6 shown, three consecutive temperature ranges can be preset, namely H1 ≤ T < H2, H2 ≤ T < H3, H3 ≤ T < H4, where H1, H2, H3, and H4 are temperature values, and H1 < H2 < H3 < H4.

[0093] Each temperature range corresponds to a different paper spacing. The corresponding relationship between the preset temperature ranges and the paper spacing is as follows: the farther the temperature range is from the first threshold, the larger the corresponding paper spacing. For example, when H1 ≤ T < H2, the paper spacing is Q2; when H2 ≤ T < H3, the paper spacing is Q3; when H3 ≤ T < H4, the paper spacing is Q4, where Q2 < Q3 < Q4, and the paper spacing Q2 is also greater than the initial paper spacing Q1. Exemplarily, Q1 is 400mm, Q2 is 800mm, Q3 is 1200mm, and Q4 is 1600mm.

[0094] If the current temperature T is greater than or equal to the first threshold H1, different paper spacing controls are executed according to different temperature ranges, thereby achieving the effect of slowing down the rise of the current temperature T and / or reducing the current temperature T.

[0095] Furthermore, the first printing mode further includes:

[0096] As Figures 5 to 7 shown, S420: When the current temperature T is greater than or equal to the preset second threshold H4, stop executing the printing job.

[0097] Specifically, the second threshold H4 is the maximum value of the temperature range (i.e., the range H3 ≤ T < H4) that is farthest from the first threshold H1. When the current temperature T is in the range H3 ≤ T < H4 and printing is performed at a low speed with the preset maximum paper spacing Q4, if the current temperature T continues to rise, to prevent damage to the fixing device, after the current temperature T is greater than or equal to the second threshold H4, pause printing and the fixing device does not heat up.

[0098] Even further, the first printing mode further includes:

[0099] As Figures 5 to 7 shown, S430: When the current temperature decreases from being greater than or equal to the second threshold to the third threshold, resume executing the printing job, where 0 ≤ the third threshold < the second threshold H4.

[0100] In this embodiment, after the fixing device does not heat up, the current temperature T at its end gradually decreases. If the current temperature T decreases to the preset third threshold, the image forming device resumes printing and then completes the previously paused printing job.

[0101] The third threshold can be set to any value between 0 and the second threshold H4. The lower the current temperature T drops, the longer the time required. Considering the printing efficiency, there is no need to wait until the current temperature T drops to 0 to start printing. The third threshold can be set to H2. When the current temperature T drops to H2, resume low-speed printing with the paper spacing Q3 corresponding to the range H2 ≤ T < H3.

[0102] For a print job set to wide paper (A4 paper), after starting printing in high-speed printing mode, if the current temperature T is greater than a preset first threshold H1, the following steps are also included:

[0103] As Figure 8 shown, S310: Determine whether the actual paper type is the first type according to the paper length detection result.

[0104] In this embodiment, the first type is other standard paper types with a width smaller than the paper type set by the user. For example, when the print job is set to wide paper (A4 paper), the first type is a standard paper type with a width smaller than A4 paper (such as A5, A6 paper, etc.). The standard paper type has a determined paper length. According to the paper length detection results of the paper head front sensor 81 and the paper tail discharge sensor 82 for the first page of the print, determine whether the actual paper type is the first type. After the current temperature T at the end of the fixing device rises abnormally, it is determined that the paper type used by the user does not match the print job, that is, the user put the wrong paper, which causes the current temperature T at the end of the fixing device to be greater than the first threshold H1. Determine whether the actual paper type is the first type and then perform different controls.

[0105] Further, S311: If the actual paper type is the first type, switch to the second printing mode, which specifically includes:

[0106] S440: Reduce the printing line speed of the image forming device.

[0107] After stopping the printing that was originally started in high-speed printing mode, restart the printing at a low speed to reduce the printing line speed.

[0108] The second printing mode also includes:

[0109] As Figure 7 and Figure 9 shown, S412: Determine the actual paper type being printed according to the paper length detection result, and adjust the paper spacing to the paper spacing corresponding to the actual paper type for printing.

[0110] Specifically, according to the paper length detection results of the paper head front sensor 81 and the paper tail discharge sensor 82 for the first page of the print, judge the possible paper type used by the user, and restart the low-speed printing according to the preset paper spacing of the corresponding paper type. For example, if the paper length detection is the short side of A5, print according to the preset A5 short side paper spacing.

[0111] After reducing the printing line speed and adjusting the paper spacing corresponding to the actual paper type to restart printing, continue to monitor the current temperature T at the end of the fixing device. According to the change of the current temperature T, the control of the first printing mode as described above can be performed, such as the control methods described in steps S411, S420, and S430 above.

[0112] Further, in S312: If the actual paper type is not the first type, a paper type mismatch prompt is issued and the printing job is stopped. Specifically, it includes:

[0113] As Figure 8 shown, when the actual paper type is not the first type, that is, it is a non-standard paper type, the user is prompted that the paper type does not match. In the case where it is not necessary to ensure continuous printing (that is, not ignoring the paper type mismatch), the image forming apparatus directly stops printing. After that, the user can change the paper and start printing again, or after the printing stops, the user selects to continue printing, and then the printing control is performed according to the aforementioned first printing mode.

[0114] The printing control method of this embodiment improves the safety quality of the image forming apparatus, prevents the components at the end of the fixing device from being damaged due to overheating during abnormal printing. By adding and configuring temperature sensors in the fixing device, preset artificial intervention control processing is performed on the heating control of the fixing device, so that the fixing device can accurately identify the current abnormal printing state in possible abnormal printing scenarios and timely control the printing temperature, thereby greatly improving the reliability and safety of the fixing device.

[0115] Embodiment 2

[0116] For an image forming apparatus in which a central temperature sensor 64 and an end temperature sensor 65 are provided in the fixing device, a paper head leading edge sensor 81, a paper tail discharge sensor 82, and a paper width (paper size) sensor are provided on the paper conveyance path, there is also a problem that the temperature at the end of the fixing device is too high when printing narrow or small papers.

[0117] As Figure 10 shown, for this type of image forming apparatus, a printing control method is provided, including:

[0118] S100: Execute a printing job.

[0119] S110: Determine whether the actual paper type is the first type according to the paper detection result.

[0120] Specifically, start printing according to the settings of the printing job. Perform paper length detection and paper width detection on the first page of the printing to detect whether the actual paper type being printed matches the paper type set in the printing task, and execute corresponding control according to the combination of the two detection results.

[0121] State 1: The actual paper type is not the first type.

[0122] The specific detection result is: the paper length does not match and the paper width matches.

[0123] Prompt that the paper type does not match. In the case where it is necessary to ensure that the user can continue printing, execute the following control:

[0124] When the printing task is set to high-speed printing, continue high-speed printing according to the paper type set by the user;

[0125] During the continuous printing process, as Figure 4 and Figure 5 shown, perform the following steps:

[0126] S200: Obtain the current temperature T at the end of the fixing device.

[0127] S300: Determine whether the current temperature T is greater than the first threshold H1.

[0128] S400: When the current temperature is greater than the preset first threshold, perform printing control on some steps of the first printing mode and the second printing mode for the image forming device. In this step, it includes steps S411, S420, S430, and S440 as in Embodiment 1, that is, it includes controlling such as reducing the printing line speed, dynamically adjusting the paper spacing according to the current temperature T, pausing printing after the current temperature T exceeds the second threshold H4, and restarting printing after the current temperature T decreases.

[0129] When the printing task is set to low-speed printing, continue low-speed printing according to the paper type set by the user;

[0130] During the continuous printing process, perform the following steps:

[0131] S200: Obtain the current temperature T at the end of the fixing device.

[0132] S300: Determine whether the current temperature T is greater than the first threshold H1.

[0133] S400: When the current temperature is greater than the preset first threshold, perform printing control on some steps of the first printing mode for the image forming device. In this step, it includes steps S411, S420, and S430 as in Embodiment 1, that is, it includes controlling such as dynamically adjusting the paper spacing according to the current temperature T, pausing printing after the current temperature T exceeds the second threshold H4, and restarting printing after the current temperature T decreases.

[0134] As Figure 10 shown, State 2: The actual paper type is the first type, switch to the second printing mode.

[0135] The detection result is: the paper length matches, the paper width does not match, or both the paper length and the paper width do not match.

[0136] Prompt that the paper type does not match. When it is necessary to ensure that the user can continue printing, perform the following control:

[0137] If the print job is set to wide paper and the paper width detection is the first type (the standard paper type with a width less than that of the wide paper), switch to the second printing mode, as Figure 9As shown, the following steps are performed:

[0138] S440: Reduce the printing line speed of the image forming apparatus;

[0139] S412: Determine the actual paper type currently being printed based on the paper length detection result, and adjust the paper pitch to the paper pitch corresponding to the actual paper type for printing.

[0140] If the print job is set to narrow paper and the paper width is detected as wide paper, perform low-speed printing according to the narrow paper set by the user.

[0141] If the print job is set to narrow paper and the paper width is detected as even narrower paper, adjust according to the paper pitch corresponding to the even narrower paper, and then start low-speed printing.

[0142] During the process of continuing low-speed printing, continuously monitor the current temperature T at the end of the fixing device, and perform control of the first printing mode according to the current temperature T, as Figure 4 and Figure 5 shown, perform the following steps:

[0143] S200: Obtain the current temperature T at the end of the fixing device.

[0144] S300: Determine whether the current temperature T is greater than the first threshold H1.

[0145] S400: When the current temperature is greater than the preset first threshold, perform printing control of the first printing mode on the image forming apparatus. In this step, it includes steps S411, S420, and S430 as in Embodiment 1, that is, it includes controlling to dynamically adjust the paper pitch according to the current temperature T, pausing printing when the current temperature T exceeds the second threshold H4, and restarting printing after the current temperature T decreases, etc.

[0146] In the case of State 1 or State 2, when the current temperature T is greater than or equal to the preset second threshold H4, after the image forming apparatus stops printing, an error is reported to prompt the user that the paper type does not match.

[0147] In the case of State 1 or State 2, if it is not necessary to ensure that the user can continue printing, the image forming apparatus stops printing, and then an error is reported to prompt the user that the paper type does not match.

[0148] An embodiment of the present invention provides an image forming apparatus, including the foregoing structure and performing the foregoing printing control method.

[0149] The foregoing are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A printing control method, executed in an image forming device, wherein the image forming device includes a fixing device, characterized in that: The method comprises: Execute print jobs; Acquiring a current temperature of an end portion of the fixing device; Determine whether the current temperature is greater than or equal to a preset first threshold; If the current temperature is greater than or equal to the first threshold, the first printing mode is switched.

2. The printing control method according to claim 1, characterized in that: The first printing mode includes: According to the current temperature, the paper spacing is adjusted.

3. The printing control method according to claim 2, characterized in that: The step of adjusting the paper spacing according to the current temperature includes: Determine the temperature range according to the current temperature; According to the correspondence between the preset temperature range and the paper spacing, the paper spacing is adjusted to the corresponding one.

4. The printing control method according to claim 3, characterized in that: The correspondence between the preset temperature interval and the paper spacing includes: the temperature interval farther from the first threshold corresponds to a larger paper spacing.

5. The printing control method according to claim 4, characterized in that: If the current temperature is greater than a preset second threshold, the printing operation is stopped.

6. The printing control method according to claim 5, characterized in that: The second threshold is the maximum value of the temperature interval farthest from the first threshold.

7. The printing control method according to claim 6, characterized in that: It also includes that if the current temperature decreases from greater than the second threshold to a third threshold, the printing job is resumed, and 0≤the third threshold<the second threshold.

8. The printing control method according to claim 1, characterized in that: When the current temperature is greater than a preset first threshold, the method includes: It is determined whether the actual paper type is the first type according to the paper length detection result.

9. The printing control method according to claim 8, characterized in that: The method of judging whether the actual paper type is the first type according to the paper length detection result further includes: If the actual paper type is the first type, switch to the second printing mode.

10. The printing control method according to claim 9, characterized in that: The second printing mode includes: According to the paper length detection result, the actual paper type currently being printed is determined, and the paper spacing is adjusted to a paper spacing corresponding to the actual paper type for printing.

11. The printing control method according to claim 10, characterized in that: The second printing mode further includes: The printing linear speed of the image forming device is reduced.

12. The printing control method according to claim 10, characterized in that: If the actual paper type is not the first type, a paper type mismatch prompt is issued and the printing job is stopped.

13. A printing control method, executed in an image forming device, wherein the image forming device comprises a fixing device, characterized in that: The method comprises: Execute print jobs; Determining whether the actual paper type is the first type according to the paper detection result; If the actual paper type is the first type, switch to the second printing mode.

14. The printing control method according to claim 13, characterized in that: The second printing mode includes: According to the paper length detection result, the actual paper type currently being printed is determined, and the paper spacing is adjusted to a paper spacing corresponding to the actual paper type for printing.

15. The printing control method according to claim 14, characterized in that: The second printing mode further includes: The printing linear speed of the image forming device is reduced.

16. The printing control method according to claim 13, characterized in that: If the actual paper type is not the first type, a paper type mismatch prompt is issued and the printing job is stopped.

17. The printing control method according to any one of claims 13 to 16, characterized in that: Also includes: Acquiring a current temperature of an end portion of the fixing device; Determine whether the current temperature is greater than or equal to a preset first threshold; If the current temperature is greater than or equal to the first threshold, the first printing mode is switched.

18. The printing control method according to claim 17, characterized in that: The first printing mode includes: According to the current temperature, the paper spacing is adjusted.

19. The printing control method according to claim 18, characterized in that: The step of adjusting the paper spacing according to the current temperature includes: Determine the temperature range according to the current temperature; According to the correspondence between the preset temperature range and the paper spacing, the paper spacing is adjusted to the corresponding one.

20. The printing control method according to claim 19, characterized in that: The correspondence between the preset temperature interval and the paper spacing includes: the temperature interval farther from the first threshold corresponds to a larger paper spacing.

21. The printing control method according to claim 20, characterized in that: If the current temperature is greater than a preset second threshold, the printing operation is stopped.

22. The printing control method according to claim 21, characterized in that: The second threshold is the maximum value of the temperature interval farthest from the first threshold.

23. The printing control method according to claim 22, characterized in that: It also includes that if the current temperature decreases from greater than the second threshold to a third threshold, the printing job is resumed, and 0≤the third threshold<the second threshold.

24. An image forming device, comprising a fixing device, characterized in that: The end of the fixing device is provided with a temperature sensor for collecting the current temperature of the end of the fixing device; The image forming apparatus executes the printing control method according to any one of claims 1 to 23.

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