Fixing temperature control device and image forming equipment

Abstract

The utility model provides a fixing temperature control device. The device comprises a control module, a switch module, a first temperature control module and a second temperature control module. The control module outputs a control signal corresponding to the working state of the driving module; the switch module outputs a temperature signal of the heating roller at the first output end or the second output end of the switch module according to the control signal; the first temperature control module and the second temperature control module respectively output a first temperature control signal or a second temperature control signal according to the temperature signal of the heating roller; and the control module controls the heater to stop heating the heating roller according to the first temperature control signal or controls the heater to stop heating the heating roller according to the second temperature control signal, so that the situations that the fuser is adhered and damaged due to overhigh temperature and the like are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of image forming, in particular to a fixing temperature control device and an image forming equipment. BACKGROUND

[0002] An image forming device is a device for forming an image on an imaging medium by an imaging principle, such as a printer, a copier, a fax machine, a multifunction image making and copying device, an electrostatic printing device, and any other similar device. Among them, a fixing device is an essential part of the image forming device, mainly composed of a fixing frame, a heating lamp, a heating roller, a pressure roller, a sensor, a protection device, and the like. In actual application, in order to ensure that the toner corresponding to the target image is melted and fixed to the imaging medium, the fixing device is usually controlled to be heated to a fixed temperature when fixing.

[0003] Generally, the heating lamp of the fixing device generates high temperature after being powered on, and transmits heat to the heating roller through heat radiation and heat conduction. In the printing process, the heating roller rotates under the driving of the driving module, realizes the contact of the heating roller and the pressure roller at different positions to control the temperature within a certain range by the way of paper or rotation to accelerate heat dissipation.

[0004] However, in actual application, there are situations such as damage or control abnormality of the driving module, which causes the heating roller to fail to rotate, so that the continuous heating of the heating lamp cannot release heat in time, and when the temperature exceeds the bearing range of the heating roller, the fixing device is easily damaged.

[0005] It should be pointed out that the information disclosed in the background section of the present application is only intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0006] Therefore, the present application provides a fixing temperature control device and an image forming equipment to solve the problem that when the driving module is abnormal, heat is difficult to release, the temperature is too high, and the fixing device is easily damaged.

[0007] In a first aspect, an embodiment of the present application provides a fixing temperature control device, comprising:

[0008] A control module is configured to output a control signal corresponding to the working state of the driving module according to the working state of the driving module.

[0009] A switch module, an input end of the switch module is used for receiving a temperature signal of the heating roller, a control end of the switch module is electrically connected with an output end of the control module, the control end of the switch module is used for receiving the control signal output by the control module, and the switch module selects to output the temperature signal of the heating roller at a first output end or a second output end of the switch module according to the control signal;

[0010] A first temperature control module, an input end of the first temperature control module is electrically connected with the first output end of the switch module, and the first temperature control module is used for receiving the temperature signal of the heating roller output by the switch module and outputting a first temperature control signal according to the temperature signal of the heating roller;

[0011] A second temperature control module, an input end of the second temperature control module is electrically connected with the second output end of the switch module, and the second temperature control module is used for receiving the temperature signal of the heating roller output by the switch module and outputting a second temperature control signal according to the temperature signal of the heating roller;

[0012] The first input end of the control module is electrically connected with the output end of the first temperature control module, the second input end of the control module is electrically connected with the output end of the second temperature control module, and the control module is used for controlling the heater to stop heating the heating roller according to the first temperature control signal or controlling the heater to stop heating the heating roller according to the second temperature control signal, wherein a first temperature represented by the first temperature control signal is less than a second temperature represented by the second temperature control signal.

[0013] In the embodiments of the present application, the fixing temperature control device comprises a control module, a switch module, a first temperature control module and a second temperature control module. The control module outputs a control signal corresponding to the working state of the driving module according to the working state of the driving module, and the switch module outputs the temperature signal of the heating roller at the first output end or the second output end of the switch module according to the control signal; when the temperature signal of the heating roller is output at the first end of the switch module, the first temperature control module outputs a first temperature control signal according to the temperature signal of the heating roller; when the temperature signal of the heating roller is output at the second end of the switch module, the second temperature control module outputs a second temperature control signal according to the temperature signal of the heating roller; the control module controls the heater to stop heating the heating roller according to the first temperature control signal, or controls the heater to stop heating the heating roller according to the second temperature control signal. Thus, in the embodiments of the present application, the working state of the driving module is associated with the heating control of the heater on the heating roller in the fixing device, and the control module, the first temperature control module, the second temperature control module and the switch module are combined, so that the control module can control the heater to stop heating the heating roller at different temperature values based on the first temperature control module and the second temperature control module in different working states of the driving module. For example, when the working state of the driving module is abnormal stop and the heater is still enabled to heat, the occurrence of fixing device adhesion damage due to excessive temperature can be reduced.

[0014] In a possible implementation, the switch module is an analog switch chip.

[0015] The input end of the analog switch chip is configured to receive the temperature signal of the heating roller, the gating end of the analog switch chip is configured as the control end of the switch module, the first output end of the analog switch chip is configured as the first output end of the switch module, the second output end of the analog switch chip is configured as the second output end of the switch module, and the analog switch chip is configured to gate the first temperature control module to output the temperature signal of the heating roller through the first output end of the analog switch chip or gate the second temperature control module to output the temperature signal of the heating roller through the second output end of the analog switch chip based on the control signal.

[0016] In the embodiment of the present application, the switch module is an analog switch chip. Since the analog switch chip is used to select the first temperature control module based on the control signal to output the temperature signal of the heating roller through the first output end of the analog switch chip, or to select the second temperature control module to output the temperature signal of the heating roller through the second output end of the analog switch chip, the control module can control the heater to stop heating the heating roller at different temperature values based on the first temperature control module and the second temperature control module in different working states of the driving module. For example, when the working state of the driving module is abnormal stop, and the heater is still enabled to heat, the occurrence of situations such as damage of the fuser due to excessive temperature can be reduced.

[0017] In a possible implementation, the fixing temperature control device further comprises:

[0018] The temperature acquisition module is configured to acquire the temperature of the heating roller and output a temperature signal corresponding to the temperature of the heating roller.

[0019] In the embodiment of the present application, the fixing temperature control device further comprises a temperature acquisition module. The temperature acquisition module acquires the temperature of the heating roller and outputs a temperature signal corresponding to the temperature of the heating roller. It can be understood that the temperature acquisition module further improves the response speed of the fixing temperature control device to temperature changes, and makes the circuit structure more perfect. To some extent, it can help to improve the reliability of the fixing device.

[0020] In a possible implementation, the temperature acquisition module further comprises:

[0021] The impedance matching module is configured to match the resistance of the switch module.

[0022] In the embodiment of the present application, the fixing temperature control device further comprises an impedance matching module. The impedance module is configured to match the resistance of the temperature acquisition module and the switch module. To some extent, it can ensure the accuracy of the temperature signal of the heating roller, and further more accurately control the temperature of the heating roller.

[0023] In a possible implementation, the fixing temperature control device further comprises:

[0024] The over-temperature protection module is configured to control the electrical connection between the control module and the heating roller to be disconnected or conducted according to the temperature signal of the heating roller.

[0025] In the embodiment of the present application, the fixing temperature control device further comprises an over-temperature protection module. The over-temperature protection module is configured to control the switch of the heater according to the temperature signal of the heating roller, so as to stop or start the heating of the heating roller by the heater. Thus, the problem of continuous heating of the heating roller due to the failure of the control module is effectively prevented, and the damage to the fixing device is reduced to a certain extent.

[0026] In a possible implementation, the first temperature control module comprises a first reference voltage source and a first comparator.

[0027] The negative input end of the first comparator is connected to the first reference voltage source, the positive input end of the first comparator is connected to the first output end of the switch module, and the output end of the first comparator is connected to the first input end of the control module.

[0028] The positive input end of the first comparator is the input end of the first temperature control module, and the output end of the first comparator is the output end of the first temperature control module.

[0029] In the embodiment of the present application, when the first output end of the switch module outputs the temperature signal of the heating roller, the temperature signal of the heating roller is input to the positive input end of the first comparator. The negative input end of the first comparator is electrically connected to the first reference voltage source and is configured to receive the first reference voltage corresponding to the first temperature. The first comparator compares the temperature signal of the heating roller and the first reference voltage corresponding to the first temperature. When the voltage of the temperature signal of the heating roller is lower than the first reference voltage, a level signal, i.e., the first temperature control signal, is output, indicating that the current temperature of the heating roller reaches the first temperature. Thus, the adjustment of the temperature of the heating roller is realized, and the damage to the fixing device is ultimately reduced.

[0030] In a possible implementation, the first reference voltage source comprises a first resistor, a first end of the first resistor being configured to be electrically connected to an external voltage source.

[0031] A second resistor, a first end of the second resistor being electrically connected to a second end of the first resistor and serving as a first voltage division end, and a second end of the second resistor being grounded.

[0032] The negative input end of the first comparator is electrically connected to the first voltage division end.

[0033] In the embodiment of the present application, the reference voltage source is obtained by voltage division of the external voltage source through the first resistor and the second resistor, so that the first reference voltage input to the first comparator is more accurate, and the adjustment of the temperature of the heating roller is more accurate.

[0034] In a possible implementation, the first temperature control module further comprises:

[0035] a fourth resistor, a first end of the fourth resistor being electrically connected with the external voltage source, and a second end of the fourth resistor being electrically connected with the output end of the first comparator;

[0036] a first capacitor, a first end of the first capacitor being electrically connected with the output end of the first comparator, and a second end of the first capacitor being grounded.

[0037] In the embodiment of the present application, the first capacitor and the fourth resistor are connected with the output end of the first comparator, which can reduce the noise interference in the first temperature control signal, and thus ensure that the control module can receive an accurate first temperature control signal, and to some extent, reduce the damage to the heating roller.

[0038] In a possible implementation manner,

[0039] the second temperature control module comprises a second reference voltage source and a second comparator.

[0040] The negative input end of the second comparator is connected with the second reference voltage source, the positive input end of the second comparator is connected with the second output end of the switch module, and the output end of the second comparator is connected with the second input end of the control module.

[0041] The positive input end of the second comparator is the input end of the second temperature control module, and the output end of the second comparator is the output end of the second temperature control module.

[0042] In the embodiment of the present application, when the second output end of the switch module outputs the temperature signal of the heating roller, the temperature signal of the heating roller is input to the positive input end of the second comparator; the negative input end of the second comparator is electrically connected with the second reference voltage source and is used for receiving the second reference voltage corresponding to the second temperature; the second comparator compares the temperature signal of the heating roller with the second reference voltage corresponding to the second temperature, and when the voltage of the temperature signal of the heating roller is lower than the second reference voltage, a level signal, i.e., the second temperature control signal, is output, indicating that the current temperature of the heating roller reaches the second temperature, and thus the adjustment of the temperature of the heating roller is realized.

[0043] In a possible implementation manner, the second reference voltage source comprises:

[0044] a fifth resistor, a first end of the fifth resistor being used for being electrically connected with the external voltage source;

[0045] a sixth resistor, a first end of the sixth resistor being electrically connected with a second end of the fifth resistor and serving as a second voltage division end, and a second end of the sixth resistor being grounded.

[0046] The negative input end of the second comparator is electrically connected with the second voltage dividing end.

[0047] In the embodiment of the present application, the reference voltage source is obtained by voltage division of the external voltage source through the fifth resistor and the sixth resistor, so that the second reference voltage input into the second comparator is more accurate, and the heating roller temperature is more accurately adjusted.

[0048] In a possible implementation, the second temperature control module further includes:

[0049] The first end of the eighth resistor is electrically connected with the external voltage source, and the second end of the eighth resistor is electrically connected with the output end of the second comparator.

[0050] The first end of the second capacitor is electrically connected with the output end of the second comparator, and the second end of the second capacitor is grounded.

[0051] In the embodiment of the present application, the second capacitor and the eighth resistor are connected at the output end of the second comparator, so that the noise interference in the second temperature control signal is reduced, and the control module can receive an accurate second temperature control signal, thereby reducing the damage to the fixing device to a certain extent.

[0052] In a possible implementation, the over-temperature protection module specifically includes:

[0053] The input end of the over-temperature comparison circuit is electrically connected with the output end of the temperature acquisition module, and the over-temperature comparison circuit is used to compare the temperature signal of the heating roller with a preset temperature signal, so as to prevent the continuous heating of the heating roller due to the failure of the control module.

[0054] The gate of the MOS tube is electrically connected with the output end of the over-temperature comparison circuit, the source of the MOS tube is grounded, the drain of the MOS tube is electrically connected with the second output end of the control module, and the drain of the MOS tube is the output end of the over-temperature protection module.

[0055] In the embodiment of the present application, the over-temperature comparison circuit is used to compare the temperature signal of the heating roller with a preset temperature signal, and control the gate of the MOS tube according to the comparison result, so as to control the disconnection or conduction of the heater, so as to stop or start the heating of the heater to the heating roller.

[0056] In a possible implementation, the over-temperature comparison circuit specifically includes:

[0057] The first end of the eleventh resistor is electrically connected with the output end of the temperature acquisition module, and the first end of the eleventh resistor is the input end of the over-temperature comparison circuit.

[0058] a twelfth resistor, a first end of the twelfth resistor being electrically connected with the external voltage source;

[0059] a thirteenth resistor, a first end of the thirteenth resistor being electrically connected with a second end of the twelfth resistor; a second end of the thirteenth resistor being grounded;

[0060] a third comparator, a negative input end of the third comparator being electrically connected with the second end of the eleventh resistor; a positive input end of the third comparator being electrically connected with a node between the twelfth resistor and the thirteenth resistor; wherein an output end of the third comparator is an output end of the over-temperature comparison circuit;

[0061] a third capacitor, a first end of the third capacitor being electrically connected with the second end of the eleventh resistor; a second end of the third capacitor being electrically connected with the node between the twelfth resistor and the thirteenth resistor;

[0062] a fourteenth resistor, a first end of the fourteenth resistor being electrically connected with the positive input end of the third comparator; a second end of the fourteenth resistor being electrically connected with the output end of the third comparator;

[0063] a fifteenth resistor, a first end of the fifteenth resistor being electrically connected with the external voltage source; a second end of the fifteenth resistor being electrically connected with the output end of the third comparator;

[0064] a sixteenth resistor, a first end of the sixteenth resistor being electrically connected with the second end of the fifteenth resistor;

[0065] a fourth capacitor, a first end of the fourth capacitor being electrically connected with a second end of the sixteenth resistor; a second end of the fourth capacitor being grounded.

[0066] In the embodiments of the present application, the over-temperature comparison circuit is used to compare the temperature signal of the heating roller with the preset temperature signal, and control the gate of the MOS tube according to the comparison result, so as to control the heating device to be turned off or turned on, so as to stop or start the heating device to heat the heating roller. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0068] Figure 1 A structure schematic diagram of a fixing device provided by the embodiments of the present application.

[0069] Figure 2 A structure schematic view of a fixing temperature control device provided by an embodiment of the present application.

[0070] Figure 3 A structure schematic view of a switch module provided by an embodiment of the present application.

[0071] Figure 4 A structure schematic view of a first temperature control module provided by an embodiment of the present application.

[0072] Figure 5 A structure schematic view of another first temperature control module provided by an embodiment of the present application.

[0073] Figure 6 A structure schematic view of a second temperature control module provided by an embodiment of the present application.

[0074] Figure 7 A structure schematic view of another second temperature control module provided by an embodiment of the present application.

[0075] Figure 8 A structure schematic view of another fixing temperature control device provided by an embodiment of the present application.

[0076] Figure 9 A structure schematic view of another fixing temperature control device provided by an embodiment of the present application.

[0077] Figure 10 A structure schematic view of an impedance matching module provided by an embodiment of the present application.

[0078] Figure 11 A structure schematic view of another fixing temperature control device provided by an embodiment of the present application.

[0079] Figure 12 A structure schematic view of an over-temperature protection module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0080] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0081] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0082] The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the embodiments of the present application and the accompanying claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0083] It should be understood that the term "and / or" used herein only describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0084] An image forming device is a device that forms an image on an imaging medium by an imaging principle, such as a printer, a copier, a fax machine, a multifunction image making and copying device, an electrostatic printing device, and any other similar device. Among them, the fixing device is an indispensable part of the image forming device. In actual application, in order to ensure that the toner corresponding to the target image is fused and fixed to the imaging medium, the fixing device is usually controlled to heat to a fixed temperature before fixing.

[0085] Specifically, the fixing device mainly consists of a fixing frame, a heating lamp, a heating roller, a pressure rod, a sensor, a protection device and the like. For ease of understanding, see Figure 1 A structural schematic diagram of a fixing device provided by the embodiments of the present application is shown. As shown in the figure, the heating roller 101 and the pressure roller 102 are shown. The heating lamp is located inside the heating roller, and the heating lamp is usually a halogen lamp or a ceramic sheet. After being electrified, the surface of the lamp filament will generate high temperature, which will transmit heat to the inner wall of the heating roller through radiation and conduction.

[0086] In the prior art, after the heating lamp in the fixing device is electrified, high temperature is generated, which transmits heat to the inner wall of the heating roller through radiation and conduction, and finally realizes the temperature rise of the heating roller. In the image forming operation process, the driving module drives the heating roller to rotate, realizes the contact of the heating roller with the pressure roller or the paper at different positions, and then realizes the heat dissipation of the heating roller, and finally controls the temperature of the heating roller to be near the target temperature.

[0087] However, in actual application, there are situations of damage or control abnormality of the driving module, at this time, the heating lamp in the fixing device is powered on and generates heat continuously; when the temperature of the heating roller is too high, the heating roller is easily damaged. It can be understood that the image forming device may have a situation of continuous enablement of the heating signal during the execution of the job task. However, because the driving device driving the heating roller to rotate is suddenly damaged or has a control abnormality, the heating roller is not driven to rotate, thereby causing the continuous heating of the heating lamp (ceramic sheet, halogen lamp), and the heat cannot be released in time. When the temperature exceeds the upper limit of the temperature that the material inside the heating roller can withstand, the fixing device is easily stuck, and the heating roller is damaged.

[0088] In the embodiment of the present application, the fixing temperature control device includes a control module, a switch module, a first temperature control module, and a second temperature control module. The control module outputs a control signal corresponding to the working state of the driving module according to the working state of the driving module. The switch module outputs the temperature signal of the heating roller at the first output end or the second output end of the switch module according to the control signal. When the temperature signal of the heating roller is output at the first end of the switch module, the first temperature control module outputs a first temperature control signal according to the temperature signal of the heating roller. When the temperature signal of the heating roller is output at the second end of the switch module, the second temperature control module outputs a second temperature control signal according to the temperature signal of the heating roller. The control module controls the heater to stop heating the heating roller according to the first temperature control signal, or controls the heater to stop heating the heating roller according to the second temperature control signal.

[0089] In the embodiment of the present application, the working state of the driving module is associated with the heating control of the heater on the heating roller in the fixing device, and the control module, the first temperature control module, the second temperature control module, and the switch module are combined, so that the control module can control the heater to stop heating the heating roller at different temperature values based on the first temperature control module and the second temperature control module in different working states of the driving module. For example, when the working state of the driving module is abnormal stop and the heater is still enabled to heat, the occurrence of situations such as sticking and damage of the fixing device due to too high temperature can be reduced.

[0090] Specifically, the following will be described in detail in combination with the drawings and specific embodiments.

[0091] Reference is made to Figure 2 A structure diagram of a fixing temperature control device provided in the embodiment of the present application is shown. As shown in the figure, the fixing temperature control device 200, the driving module 205, and the heater 206 are shown in the figure. The fixing temperature control device 200 specifically includes a switch module 201, a first temperature control module 202, a second temperature control module 203, and a control module 204. As shown in the figure, the driving module 205 is connected to the control module 204, and the control module 204 is connected to the switch module 201, the first temperature control module 202, and the second temperature control module 203. Figure 2The connection relationship between the modules is shown as follows: the control module 204 is electrically connected with the driving module 205; the control module 204 is electrically connected with the heater 205; the first output end of the switch module 201 is electrically connected with the input end of the first temperature control module 202; the input end of the second temperature control module 203 is electrically connected with the second output end of the switch module 201; the first input end of the control module 204 is electrically connected with the output end of the first temperature control module 202; and the second input end of the control module 204 is electrically connected with the output end of the second temperature control module 203.

[0092] For the convenience of understanding, the switch module 201, the first temperature control module 202, the second temperature control module 203 and the control module 204 shown in FIG. 2 will be described one by one in the following. Figure 2

[0093] In the embodiment of the present application, the control module is configured to output a control signal corresponding to the working state of the driving module according to the working state of the driving module. The working state of the driving module includes a normal working state and an abnormal working state. It can be understood that when the working state of the driving module is the normal working state, the control module outputs a control signal corresponding to the normal working state; and when the working state of the driving module is the abnormal working state, the control module outputs a control signal corresponding to the abnormal working state.

[0094] In the embodiment of the present application, the input end of the switch module is configured to receive the temperature signal of the heating roller. Meanwhile, the control end of the switch module is configured to receive the control signal output by the control module, and select the first output end or the second output end of the switch module to output the temperature signal of the heating roller according to the control signal. It can be understood that when the control end of the switch module receives the control signal corresponding to the normal working state, the switch module controls the second output end of the switch module to be turned on, that is, the temperature signal of the heating roller is selected to be output at the second output end of the switch module; and when the control end of the switch module receives the control signal corresponding to the abnormal working state, the switch module controls the first output end of the switch module to be turned on, that is, the temperature signal of the heating roller is selected to be output at the first output end of the switch module.

[0095] In a possible implementation, the switch module is an analog switch chip. Specifically, the input end of the analog switch chip is configured to receive the temperature signal of the heating roller, the gating end of the analog switch chip serves as the control end of the switch module, the first output end of the analog switch chip serves as the first output end of the switch module, and the second output end of the analog switch chip serves as the second output end of the switch module. The analog switch chip is configured to select the first temperature control module to output the temperature signal of the heating roller through the first output end of the analog switch chip or select the second temperature control module to output the temperature signal of the heating roller through the second output end of the analog switch chip based on the control signal.

[0096] ​Of course, the switch module can also be a digital switch chip, and the present application does not make a specific limitation in this regard.

[0097] The present application also provides a logic diagram of the switch module. Specifically, referring to Figure 3 The present application provides a structure diagram of the switch module. As shown in the figure, the S signal is a control signal corresponding to the working state of the driving module; the OE signal is an enable signal; the A signal is a temperature signal of the heating roller; and SW1 and SW2 represent two controlled switches. It can be understood that when the switch module is working normally, the OE signal is a low-level signal. At this time, when the S signal is a high-level signal, i.e., the working state of the driving module is a normal working state, SW2 is turned on at this time; when the S signal is a low-level signal, i.e., the working state of the driving module is an abnormal working state, SW1 is turned on at this time.

[0098] For ease of understanding, the present application also provides a corresponding logic table, as shown in Table 1. Figure 3

[0099] Table 1:

[0100]

[0101] For example, when the fixing motor is stopped (the working state of the driving module is an abnormal working state), the fixing motor feeds back a working state abnormal signal, i.e., a low-level feedback signal, to the control module; after the control module detects that the received feedback signal is a low-level feedback signal, it sends a control signal of OE=0 and S=0 to the switch module; according to the control signal of OE=0 and S=0, the switch module turns on the switch SW1, so that the temperature signal of the heating roller is input to the first temperature control module. At this time, due to the control of the first temperature control module on the temperature, the fixing heater is not allowed to be heated to the second temperature (for example, 300°C) for fixing work, but the temperature protection point of the fixing heater is switched to the first temperature (for example, 150°C); since the temperature of the heating roller is higher than the temperature protection point, i.e., the first temperature, the control module controls to stop outputting the heating signal, and waits for the heating roller to cool down, so as to prevent the fixing heater from sticking due to too high temperature.

[0102] In the present application, the first temperature control module is used to receive the temperature signal of the heating roller output by the switch module, and output a first temperature control signal according to the temperature signal of the heating roller. It can be understood that the first temperature control signal is used to instruct the control module to control the temperature of the heating roller to be at the first temperature.

[0103] ​In a possible implementation, the first temperature control module specifically comprises: a first reference voltage source and a first comparator. The negative input end of the first comparator is connected to the first reference voltage source, the positive input end of the first comparator is connected to the first output end of the switch module, and the output end of the first comparator is connected to the first input end of the control module. The positive input end of the first comparator is the input end of the first temperature control module, and the output end of the first comparator is the output end of the first temperature control module.

[0104] In the embodiment of the application, when the first output end of the switch module outputs the temperature signal of the heating roller, the temperature signal of the heating roller is input to the positive input end of the first comparator; the negative input end of the first comparator is electrically connected to the first reference voltage source and is used to receive the first reference voltage corresponding to the first temperature; the first comparator compares the temperature signal of the heating roller and the first reference voltage corresponding to the first temperature, and outputs a level signal, i.e., the first temperature control signal, when the voltage of the temperature signal of the heating roller is lower than the first reference voltage, indicating that the current temperature of the heating roller reaches the first temperature, thereby realizing adjustment of the temperature of the heating roller and ultimately reducing damage to the fixing device.

[0105] In a possible implementation, the first reference voltage source comprises: a first resistor and a second resistor. The first end of the first resistor is used to be electrically connected to an external voltage source; the first end of the second resistor is electrically connected to the second end of the first resistor and serves as a first voltage division end; the second end of the second resistor is grounded; and the negative input end of the first comparator is electrically connected to the first voltage division end.

[0106] In the embodiment of the application, the reference voltage source is obtained by voltage division of the external voltage source through the first resistor and the second resistor, which can make the first reference voltage input to the first comparator more accurate, thereby realizing more accurate adjustment of the temperature of the heating roller.

[0107] Specifically, the embodiment of the application further provides a structural diagram of the first temperature control module. Referring to Figure 4 The structural diagram of the first temperature control module is provided in the embodiment of the application. As shown in the figure, the first resistor R1, the second resistor R2, the first comparator I1, and the third resistor R3 are shown in the figure. The first end of the first resistor is electrically connected to an external voltage source VDD; the first end of the second resistor is electrically connected to the second end of the first resistor; the second end of the second resistor is grounded; the negative input end of the first comparator is electrically connected to the node between the first resistor and the second resistor; the output end of the first comparator is electrically connected to the first input end of the control module; and the first end of the third resistor is electrically connected to the first output end of the switch module; and the second end of the third resistor is electrically connected to the positive input end of the first comparator.

[0108] The output end of the first comparator is the output end of the first temperature control module; and the first end of the third resistor is the input end of the first temperature control module.

[0109] In the embodiment of the present application, when the voltage of the positive input end of the first comparator (i.e., the voltage of the temperature signal of the heating roller) is lower than the voltage of the first reference voltage source of the negative input end (at this time, the temperature is too high), a level signal (i.e., the first temperature control signal, indicating that the current temperature of the heating roller reaches the first temperature) is outputted, so as to control the module to control the heater to stop heating the heating roller, thereby realizing the adjustment of the temperature of the heating roller, and finally reducing the damage to the fixing device.

[0110] In a possible implementation, the embodiment of the present application further provides another structural diagram of the first temperature control module. Specifically, referring to Figure 5 , the embodiment of the present application provides another structural diagram of the first temperature control module. As shown in the figure, on the basis of Figure 4 , the fourth resistor R4 and the first capacitor C1 are further included. The first end of the fourth resistor is electrically connected with the external voltage source, and the second end of the fourth resistor is electrically connected with the output end of the first comparator; the first end of the first capacitor is electrically connected with the output end of the first comparator; and the second end of the first capacitor is grounded.

[0111] In the embodiment of the present application, the first capacitor and the fourth resistor are connected to the output end of the first comparator, which can reduce the noise interference in the first temperature control signal, thereby ensuring that the control module can receive the accurate first temperature control signal, and to some extent, reducing the damage to the heating roller.

[0112] Of course, those skilled in the art can also design other circuits to realize the corresponding functions of the first temperature control module according to actual needs, and the present application does not make specific limitations thereto.

[0113] In a possible implementation, the second temperature control module includes a second reference voltage source and a second comparator. The negative input end of the second comparator is connected with the second reference voltage source, the positive input end of the second comparator is connected with the second output end of the switch module, and the output end of the second comparator is connected with the second input end of the control module. It should be noted that the positive input end of the second comparator is the input end of the second temperature control module, and the output end of the second comparator is the output end of the second temperature control module.

[0114] In the embodiment of the present application, when the second output end of the switch module outputs the temperature signal of the heating roller, the temperature signal of the heating roller is input to the positive input end of the second comparator; the negative input end of the second comparator is electrically connected with the second reference voltage source and is used for receiving the second reference voltage corresponding to the second temperature; the second comparator compares the temperature signal of the heating roller and the second reference voltage corresponding to the second temperature, and outputs a level signal, i.e., the second temperature control signal, when the voltage of the temperature signal of the heating roller is lower than the second reference voltage, indicating that the current temperature of the heating roller reaches the second temperature, thereby realizing the adjustment of the temperature of the heating roller.

[0115] In a possible implementation, the second reference voltage source comprises a fifth resistor and a sixth resistor. The first end of the fifth resistor is electrically connected with the external voltage source; the first end of the sixth resistor is electrically connected with the second end of the fifth resistor and serves as a second voltage division end; the second end of the sixth resistor is grounded; and the negative input end of the second comparator is electrically connected with the second voltage division end.

[0116] In the embodiment of the present application, the reference voltage source is obtained by voltage division of the external voltage source through the fifth resistor and the sixth resistor, which can make the second reference voltage input to the second comparator more accurate, thereby realizing more accurate adjustment of the temperature of the heating roller.

[0117] The embodiment of the present application further provides a structure diagram of a second temperature control module. Specifically, referring to Figure 6 , the structure diagram of the second temperature control module provided by the embodiment of the present application. As shown in the figure, the fifth resistor R5, the sixth resistor R6, the second comparator I2 and the seventh resistor R7 are shown in the figure. The first end of the fifth resistor is electrically connected with the external voltage source; the first end of the sixth resistor is electrically connected with the second end of the first resistor; the second end of the sixth resistor is grounded; the negative input end of the second comparator is electrically connected with the node between the fifth resistor and the sixth resistor; the output end of the second comparator is electrically connected with the second input end of the control module; the first end of the seventh resistor is electrically connected with the second output end of the switch module; and the second end of the seventh resistor is electrically connected with the positive input end of the second comparator.

[0118] The output end of the second comparator is the output end of the second temperature control module; and the first end of the seventh resistor is the input end of the second temperature control module.

[0119] In the embodiment of the present application, when the second output end of the switch module outputs the temperature signal of the heating roller, the temperature signal of the heating roller is input to the positive input end of the second comparator through the seventh resistor; and the voltage corresponding to the second temperature is input to the negative input end of the second comparator through the voltage division of the fifth resistor and the sixth resistor. When the voltage at the positive input end of the second comparator is lower than the voltage of the second reference voltage source at the negative input end, a level signal (i.e., the second temperature control signal, indicating that the current temperature of the heating roller reaches the second temperature) is output, so as to control the control module to control the heater to stop heating the heating roller, thereby realizing the adjustment of the heating roller and reducing the damage to the fixing device.

[0120] In a possible implementation, the embodiment of the present application further provides another structural diagram of the first temperature control module. Specifically, referring to Figure 7 , the embodiment of the present application provides another structural diagram of the second temperature control module. As shown in the figure, on the basis of Figure 6 , the eighth resistor R8 and the second capacitor C2 are further included. The first end of the eighth resistor is electrically connected with the external voltage source, and the second end of the eighth resistor is electrically connected with the output end of the second comparator; the first end of the second capacitor is electrically connected with the output end of the second comparator; and the second end of the second capacitor is grounded.

[0121] In the embodiment of the present application, the second capacitor and the eighth resistor are connected to the output end of the second comparator, which can reduce the noise interference in the second temperature control signal, thereby ensuring that the control module can receive the accurate second temperature control signal, and to some extent, reducing the damage to the fixing device.

[0122] Of course, those skilled in the art can also design other circuits to realize the corresponding functions of the second temperature control module according to actual needs, and the present application does not make specific limitations thereto.

[0123] In the embodiment of the present application, the control module is further configured to control the temperature of the heating roller at the first temperature according to the first temperature control signal; or control the temperature of the heating roller at the second temperature according to the second temperature control signal, wherein the first temperature is less than the second temperature.

[0124] In the embodiment of the present application, the fixing temperature control device comprises a control module, a switch module, a first temperature control module and a second temperature control module. The control module outputs a control signal corresponding to the working state of the driving module according to the working state of the driving module, and the switch module outputs the temperature signal of the heating roller at the first output end or the second output end of the switch module according to the control signal; when the temperature signal of the heating roller is output at the first end of the switch module, the first temperature control module outputs a first temperature control signal according to the temperature signal of the heating roller; when the temperature signal of the heating roller is output at the second end of the switch module, the second temperature control module outputs a second temperature control signal according to the temperature signal of the heating roller; the control module controls the heater to stop heating the heating roller according to the first temperature control signal, or controls the heater to stop heating the heating roller according to the second temperature control signal. It can be understood that the working state of the driving module is associated with the heating control of the heater on the heating roller in the fixing device, and the control module, the first temperature control module, the second temperature control module and the switch module are combined, so that the control module can control the heater to stop heating the heating roller at different temperature values based on the first temperature control module and the second temperature control module in different working states of the driving module. For example, when the working state of the driving module is abnormal stop, and the heater is still enabled to heat, the occurrence of fixing device adhesion damage due to excessive temperature at this time can be reduced.

[0125] In a possible implementation, the fixing temperature control device further comprises a temperature acquisition module. Specifically, refer to Figure 8 For another structure of the fixing temperature control device provided in the embodiment of the present application. As shown in the figure, in Figure 2 On the basis of the fixing temperature control device further comprises a temperature acquisition module 801. As Figure 8 Shown, the connection relationship of the temperature acquisition module is that the output end of the temperature acquisition module is electrically connected with the input end of the switch module.

[0126] Specifically, in the embodiment of the present application, the temperature acquisition module is used to acquire the temperature of the heating roller, and output the temperature signal of the heating roller at the output end of the temperature acquisition module according to the temperature of the heating roller; the switch module is used to receive the temperature signal of the heating roller.

[0127] In the embodiment of the present application, the temperature of the heating roller is acquired by the temperature acquisition module, which further improves the response speed of the fixing temperature control device to temperature change, and makes the circuit structure more perfect. To some extent, it can help to improve the reliability of the fixing device.

[0128] In a possible implementation, the temperature acquisition module further comprises an impedance matching module. Specifically, refer to Figure 9 For another structure of the fixing temperature control device provided in the embodiment of the present application. As shown in the figure, inFigure 2 On the basis of the fixing temperature control device, the fixing temperature control device further comprises an impedance matching module 8011. As shown in Figure 9 , the connection relationship of the impedance matching module is that the input end of the impedance matching module receives the acquired temperature signal of the heating roller, and the output end of the impedance matching module is electrically connected with the input end of the switch module.

[0129] In the embodiment of the present application, the impedance matching module is used to match the resistance of the switch module. It can be understood that through the impedance matching module, the temperature signal of the heating roller received by the switch module is not affected by the post-circuit, and to a certain extent, the accuracy of the temperature signal of the heating roller can be ensured, and the temperature of the heating roller can be more accurately controlled.

[0130] In a possible implementation, the embodiment of the present application further provides a structural diagram of an impedance matching module. Specifically, referring to Figure 10 , the structural diagram of the impedance matching module provided by the embodiment of the present application. As shown in Figure 10 , the ninth resistor R9, the first operational amplifier A1, and the tenth resistor R10 are shown in the figure. Among them, the first end of the ninth resistor is used to receive the acquired temperature signal of the heating roller; the positive input end of the first operational amplifier is electrically connected with the second end of the ninth resistor; the negative input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier; the first end of the tenth resistor is electrically connected with the output end of the first operational amplifier; and the second end of the tenth resistor is electrically connected with the input end of the switch module.

[0131] Among them, the first end of the ninth resistor is the input end of the impedance matching module; and the second end of the tenth resistor is the output end of the impedance matching module.

[0132] In the embodiment of the present application, the temperature signal of the heating roller is input into the positive input end of the first operational amplifier through the ninth resistor; the negative input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier, which can reduce signal distortion and improve the stability of gain amplification, so that the output end of the first operational amplifier can output accurate temperature signal of the heating roller, and to a certain extent, the damage to the heating roller is reduced.

[0133] In a possible implementation, the fixing temperature control device further comprises an over-temperature protection module. Specifically, referring to Figure 11 , another structural diagram of the fixing temperature control device provided by the embodiment of the present application. As shown in the figure, on the basis of Figure 8 , the fixing temperature control device further comprises an over-temperature protection module 1101. As shown in Figure 11 , the connection relationship of the over-temperature protection module is that the input end of the over-temperature protection module is electrically connected with the output end of the temperature acquisition module.

[0134] In the embodiment of the present application, the over-temperature protection module is configured to control the heater to be turned off or turned on according to the temperature signal of the heating roller, so as to stop or start the heating of the heating roller by the heater. Thus, the problem of continuous heating of the heating roller due to the failure of the control module is effectively prevented, and the damage to the fixing device is reduced to a certain extent.

[0135] In a possible implementation, the over-temperature protection module specifically comprises an over-temperature comparison circuit and a MOS tube. The input end of the over-temperature comparison circuit is electrically connected with the output end of the temperature acquisition module; the gate of the MOS tube is electrically connected with the output end of the over-temperature comparison circuit; the source of the MOS tube is grounded; and the drain of the MOS tube is electrically connected with the heater. The input end of the over-temperature comparison circuit is the input end of the over-temperature protection module; and the drain of the MOS tube is the output end of the over-temperature protection module.

[0136] In the embodiment of the present application, the over-temperature comparison circuit is configured to compare the temperature signal of the heating roller with a preset temperature signal, and control the gate of the MOS tube according to the comparison result, so as to control the heater to be turned off or turned on, and stop or start the heating of the heating roller by the heater.

[0137] In a possible implementation, the embodiment of the present application further provides a structural diagram of an over-temperature protection module. Specifically, referring to Figure 12 , a structural diagram of an over-temperature protection module is provided in the embodiment of the present application. As shown in Figure 12 , the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the third comparator I3, the third capacitor C3, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16 and the fourth capacitor C4 are shown in the figure. The first end of the eleventh resistor is electrically connected with the output end of the temperature acquisition module; the first end of the twelfth resistor is electrically connected with an external voltage source; the first end of the thirteenth resistor is electrically connected with the second end of the twelfth resistor; the second end of the thirteenth resistor is grounded; the negative input end of the third comparator is electrically connected with the second end of the eleventh resistor; the positive input end of the third comparator is electrically connected with the node between the twelfth resistor and the thirteenth resistor; the first end of the third capacitor is electrically connected with the second end of the eleventh resistor; the second end of the third capacitor is electrically connected with the node between the twelfth resistor and the thirteenth resistor; the first end of the fourteenth resistor is electrically connected with the positive input end of the third comparator; the second end of the fourteenth resistor is electrically connected with the output end of the third comparator; the first end of the fifteenth resistor is electrically connected with an external voltage source; the second end of the fifteenth resistor is electrically connected with the output end of the third comparator; the first end of the sixteenth resistor is electrically connected with the second end of the fifteenth resistor; the first end of the fourth capacitor is electrically connected with the second end of the sixteenth resistor; and the second end of the fourth capacitor is grounded.

[0138] The first end of the eleventh resistor is an input end of the over-temperature comparison circuit; and the output end of the third comparator is an output end of the over-temperature comparison circuit.

[0139] In the embodiment of the present application, the over-temperature comparison circuit is used to compare the temperature signal of the heating roller with the preset temperature signal, and control the gate of the MOS tube according to the comparison result, so as to control the heating roller to stop or start heating.

[0140] Corresponding to the above embodiment, the present application further provides an image forming device. The image forming device comprises the fixing temperature control device described above, and for the sake of brevity, the present application will not make any further description here.

[0141] In the embodiment of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b and c can be single or multiple.

[0142] Those skilled in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be realized by electronic hardware, computer software and combination of electronic hardware and computer software. Whether the functions are realized by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0143] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0144] In several embodiments provided in the present application, any function, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, in essence or the parts that make contributions to the prior art, or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0145] The same or similar parts among the various embodiments in the specification can be referred to each other. Especially, for the device embodiments and the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A fixing temperature control device characterized by comprising: The application relates to a temperature control system for a heating roller. The temperature control system comprises: a control module configured to output a control signal corresponding to a working state of a driving module according to the working state of the driving module; a switch module configured to receive a temperature signal of the heating roller at an input end of the switch module, and configured to receive the control signal output by the control module at a control end of the switch module, and configured to output the temperature signal of the heating roller at a first output end or a second output end of the switch module according to the control signal; a first temperature control module configured to receive the temperature signal of the heating roller output by the switch module at an input end of the first temperature control module, and configured to output a first temperature control signal according to the temperature signal of the heating roller; a second temperature control module configured to receive the temperature signal of the heating roller output by the switch module at an input end of the second temperature control module, and configured to output a second temperature control signal according to the temperature signal of the heating roller; 2. The apparatus of claim 1, wherein, a first input end of the control module is electrically connected to an output end of the first temperature control module, and a second input end of the control module is electrically connected to an output end of the second temperature control module, and the control module is configured to control a heater to stop heating the heating roller according to the first temperature control signal, or to control the heater to stop heating the heating roller according to the second temperature control signal, wherein a first temperature represented by the first temperature control signal is less than a second temperature represented by the second temperature control signal. The switch module is an analog switch chip.

3. The apparatus of claim 1, wherein, An input end of the analog switch chip is configured to receive the temperature signal of the heating roller, a gate end of the analog switch chip is configured as the control end of the switch module, a first output end of the analog switch chip is configured as the first output end of the switch module, and a second output end of the analog switch chip is configured as the second output end of the switch module, and the analog switch chip is configured to select the first temperature control module to output the temperature signal of the heating roller through the first output end of the analog switch chip or select the second temperature control module to output the temperature signal of the heating roller through the second output end of the analog switch chip based on the control signal. The first temperature control module comprises a first reference voltage source and a first comparator. A negative input end of the first comparator is connected to the first reference voltage source, a positive input end of the first comparator is connected to the first output end of the switch module, and an output end of the first comparator is connected to the first input end of the control module.

4. The apparatus of claim 3, wherein, The positive input end of the first comparator is the input end of the first temperature control module, and the output end of the first comparator is the output end of the first temperature control module. The first reference voltage source comprises: a first resistor, a first end of the first resistor is configured to be electrically connected to an external voltage source. A second resistor, a first end of the second resistor is electrically connected with the second end of the first resistor and serves as a first voltage division end; and a second end of the second resistor is grounded. A negative input end of the first comparator is electrically connected with the first voltage division end.

5. The apparatus of claim 3, wherein, The first temperature control module further comprises: A fourth resistor, a first end of the fourth resistor is electrically connected with an external voltage source, and a second end of the fourth resistor is electrically connected with an output end of the first comparator. A first capacitor, a first end of the first capacitor is electrically connected with the output end of the first comparator, and a second end of the first capacitor is grounded.

6. The apparatus of claim 1, wherein, The second temperature control module comprises a second reference voltage source and a second comparator. A negative input end of the second comparator is connected with the second reference voltage source, a positive input end of the second comparator is connected with a second output end of the switch module, and an output end of the second comparator is connected with a second input end of the control module. The positive input end of the second comparator is an input end of the second temperature control module, and the output end of the second comparator is an output end of the second temperature control module.

7. The apparatus of claim 6, wherein, The second reference voltage source comprises: A fifth resistor, a first end of the fifth resistor is used to be electrically connected with an external voltage source. A sixth resistor, a first end of the sixth resistor is electrically connected with a second end of the fifth resistor and serves as a second voltage division end, and a second end of the sixth resistor is grounded. A negative input end of the second comparator is electrically connected with the second voltage division end.

8. The apparatus of claim 7, wherein, The second temperature control module further comprises: An eighth resistor, a first end of the eighth resistor is electrically connected with the external voltage source, and a second end of the eighth resistor is electrically connected with the output end of the second comparator. A second capacitor, a first end of the second capacitor is electrically connected with the output end of the second comparator, and a second end of the second capacitor is grounded.

9. The apparatus of claim 1, wherein, Further comprising: A temperature acquisition module; An output end of the temperature acquisition module is electrically connected with an input end of the switch module, used to acquire a temperature of the heating roller and output a temperature signal of the heating roller at the output end of the temperature acquisition module according to the temperature of the heating roller.

10. An image forming apparatus characterized by comprising: Comprise: The fixing temperature control device according to any one of claims 1 to 9.

Images