JP2009288543A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further save energy of an image forming apparatus by reducing energy consumption in the image forming apparatus. <P>SOLUTION: The heating temperature of a pressure member 71 in warm-up processing is adjusted according to the shift time until shifting to an energy saving mode from the completion of warm-up processing is made. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

In an image forming apparatus such as a copying machine, warm-up processing is performed to make an image formable at a timing such as when the power is turned on, when the energy saving mode is released, or when jam processing is completed. In the image forming apparatus, for example, a fixing unit having a pair of rollers (a fixing roller and a pressure roller) heats and presses a toner image on a recording medium at a nip portion formed by the roller pair. Is fixed to the recording medium.
In such an image forming apparatus, the pressure roller is heated to a temperature above which the toner image can be fixed by the warm-up process. In general, the amount of heat for heating the pressure roller can be transferred through the fixing roller, and further, the heat is transferred to the pressure roller by rotating the pressure roller relative to the fixing roller. It is a heated mechanism. For this reason, when the warm-up process is completed and the rotational driving of the pressure roller and the fixing roller is stopped, the heating of the pressure roller is stopped and the pressure roller is gradually cooled. For this reason, even after the warm-up process is completed, the pressure roller is heated to a high temperature during the warm-up process so that the temperature of the pressure roller is maintained at or above the temperature at which the toner image can be fixed.

However, the warm-up process is performed at a plurality of different timings as described above. And at each timing, the temperature of the pressure roller does not necessarily drop to room temperature. For example, there may be a case where the pressure roller is not cooled to room temperature and is close to a temperature at which the toner image can be fixed within a short period of time after shifting to the energy saving mode.
Therefore, in the warm-up process at all timings, if the same energy is input for heating the pressure roller, the pressure roller is heated more than necessary, and energy efficiency is lowered.

Therefore, in the warm-up process performed at different timings, a proposal has been made to keep the pressure roller temperature constant after all the warm-up processes by adjusting the energy input to heat the pressure roller. ing.
JP 2005-172966 A

By the way, in the image forming apparatus, in many cases, the user can arbitrarily set the time from the completion of the warm-up process to the transition to the energy saving mode.
For this reason, in an image forming apparatus that is not frequently used, the time required to shift to the energy saving mode may be set to an extremely short time of 1 minute or less.

As described above, the pressure roller is gradually cooled after the warm-up process, but is necessary for fixing the toner image when it takes a short time to shift to the energy saving mode. The energy-saving mode is entered at a temperature considerably higher than the minimum required temperature. Then, the amount of heat accumulated in the high pressure roller is only radiated thereafter.
For this reason, in the conventional image forming apparatus, particularly when it is a short time until the energy saving mode is entered, useless energy is consumed.

  SUMMARY An advantage of some aspects of the invention is that it reduces energy consumption in an image forming apparatus and further saves energy in the image forming apparatus.

  The present invention adopts the following configuration as means for solving the above-described problems.

  According to a first aspect of the present invention, there is provided the above recording medium by heating and pressurizing the toner image on the recording medium at a nip formed by a pressure member and a fixing member that are heated by transferring the heat quantity of the heat generating means. An image forming apparatus comprising: a fixing unit that fixes the toner image; and a control unit that controls the fixing unit, the minimum required temperature of the pressure member required to enable the step of fixing the toner image When performing the warm-up process in which the pressure member is heated by the heat amount of the heat generating means, the control means shifts to the energy saving mode in which the heat generation of the heat generating means is interrupted after the warm-up process is completed. A configuration is adopted in which the heating temperature of the pressurizing member in the warm-up process is adjusted according to the transition time up to.

  According to a second aspect of the present invention, in the first aspect of the present invention, in the warm-up process, the control unit is configured so that the temperature of the pressurizing member when moving to the energy saving mode is closest to the minimum required temperature. A configuration is adopted in which the heating temperature of the pressure member is determined.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the amount of heat of the heat generating means is transferred to the pressure member via the fixing member by moving the pressure member relative to the fixing member. When heat transfer is possible, a configuration is adopted in which the control means adjusts the movement time of the pressure member relative to the fixing member.

  According to a fourth invention, in any one of the first to third inventions, the control means adjusts the heating temperature of the pressure member using the minimum necessary temperature corresponding to the type of the recording medium. The configuration is adopted.

  Further, the fifth aspect of the present invention is that, in the fourth aspect of the present invention, when a plurality of types of recording media can be used and the minimum required temperature differs for each type of recording medium, the control means has the highest minimum required A configuration is adopted in which the heating temperature of the pressure member is adjusted using temperature.

According to the present invention, the heating temperature of the pressure member in the warm-up process is adjusted according to the transition time from the completion of the warm-up process to the transition to the energy saving mode.
Therefore, when the transition time is short, the heating of the pressure member is adjusted so that the heating temperature of the pressure member is relatively low, and when the transition time is long, the heating temperature of the pressure member is relatively The heating of the pressure member can be adjusted so as to be higher.
That is, according to the present invention, an optimum amount of energy corresponding to the transition time can be input to the pressure member. Therefore, energy consumption in the image forming apparatus can be reduced, and further energy saving of the image forming apparatus can be achieved.

  Hereinafter, an embodiment of an image forming apparatus according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size. In the following description, a copying machine will be described as an example of the image forming apparatus of the present invention.

FIG. 1 is a block diagram showing a functional configuration of the copying machine S1 (image forming apparatus) according to the present embodiment. FIG. 2 is a cross-sectional view schematically showing a schematic configuration of the copying machine S1.
As shown in FIG. 1, the copying machine S1 includes a display operation unit 1, an image reading unit 2, an image storage unit 3, an image processing unit 4, a printing unit 5, and a control unit 6.

The display operation unit 1 is installed on the front surface of the apparatus (not shown in FIG. 2) as a man-machine interface for associating the user and the copying machine S1, and includes a touch panel 1a and operation keys 1b.
The touch panel 1a is a display panel provided with a transparent planar pressure sensor such as a resistive film type on the display surface, displays information provided to the user, and outputs an operation signal based on the user's operation.
The operation key 1b is an operation key (hardware key) other than the operation buttons displayed on the touch panel 1a, such as a power button and a copy start button, and outputs an operation signal based on a user operation.

The image reading unit 2 reads an image of a document automatically fed by an ADF (Auto Document Feeder) or a document placed on a platen glass based on a control command input from the control unit 6 with a line sensor. The document image data is converted, and the document image data is output.
As shown in FIG. 2, the image reading unit 2 constitutes the upper part of the copying machine S1. The display operation unit 1 is disposed, for example, in the vicinity of the image reading unit 2.
The image reading unit 2 has a control unit uniquely. Then, the control unit of the image reading unit 2 controls the components of the image reading unit 2 based on an instruction from the main control unit 6.

  Returning to FIG. 1, the image storage unit 3 is a semiconductor memory, a hard disk device, or the like, and stores the original image data input from the image reading unit 2 based on a control command input from the control unit 6. Read and output document image data.

  The image processing unit 4 converts the document image data input from the image storage unit 3 into print format image data based on a control command input from the control unit 6 and outputs the converted image data. Various image processing is performed on the document image data to convert it into print format image data.

The printing unit 5 performs printing (image formation) on printing paper (recording medium) fed from the paper cassettes 7a and 7b or the paper feed tray 8 (see FIG. 2) based on a control command input from the control unit 6. As shown in FIG. 2, it constitutes a substantially central portion of the copying machine S1.
As shown in FIG. 2, the printing unit 5 includes a photosensitive drum 10, a charger 20, a laser scanning unit 30, a developing device 40, a cleaning unit 50, and a fixing device 70 (fixing means). The printing unit 5 has a control unit 80 (see FIG. 1). Then, the control unit 80 (control means) of the printing unit 5 is configured based on an instruction from the main control unit 6 (components of the printing unit 5 (photosensitive drum 10, charger 20, laser scanning unit 30, developing device 40). The cleaning unit 50, the fixing device 70, etc.) are controlled.

The photosensitive drum 10 is formed in a cylindrical shape and is disposed so as to extend in the depth direction of the paper surface of FIG. 2, and an electrostatic latent image and a toner image based on the electrostatic latent image are formed on the peripheral surface thereof. And transferring the toner image onto the printing paper.
The charger 20 is disposed so as to face the photosensitive drum 10 and charges the peripheral surface of the photosensitive drum 10.
The laser scanning unit 30 is disposed above the photosensitive drum 10 and scans the laser light emitted based on the print format image data on the peripheral surface of the photosensitive drum 10.
Then, the peripheral surface of the photosensitive drum 10 is charged by the charger 20, and laser light is scanned on the peripheral surface of the photosensitive drum 10 charged by the laser scanning unit 30. Then, an electrostatic latent image based on the print format image data is formed.

  The developing device 40 develops an image based on the electrostatic latent image on the peripheral surface of the photosensitive drum 10 by supplying toner to the peripheral surface of the photosensitive drum 10, and faces the photosensitive drum 10. Be placed.

  The cleaning unit 50 removes the toner remaining on the photosensitive drum 10 after the toner image is transferred from the photosensitive drum 10 to the printing paper, and is disposed to face the photosensitive drum 10.

The fixing device 70 fixes the toner image to the printing paper by applying heat and pressure, and is disposed on the downstream side of the developing device 40 as a printing paper conveyance path.
FIG. 3 is a schematic diagram illustrating a schematic configuration of the fixing device 70. As shown in this figure, the fixing device 70 includes a pressure roller 71 (pressure member), a fixing roller 72 (fixing member), and a heater 73 (heat generating means).

The pressure roller 71 is a roller formed of a flexible material such as resin. The fixing roller 72 is a roller formed of a hard material such as metal. The peripheral surface of the pressure roller 71 and the peripheral surface of the fixing roller 72 are in contact with each other, and a nip portion N is formed in a region where the peripheral surfaces are in contact with each other. The pressure roller 71 and the fixing roller 72 are connected to a single drive motor via a gear unit, and are reversely rotated by transmitting the rotational power of the drive motor.
The heater 73 is inserted into the fixing roller 72 and can generate heat based on an instruction from the control unit 80 of the printing unit 5.

In the fixing device 70 configured as described above, the pressure roller 71 and the fixing roller 72 are rotationally driven in a state where the heater 73 generates heat and the printing paper is not pinched in the nip portion N (that is, the fixing roller 70 is rotated). When the pressure roller 71 is moved with respect to the fixing roller 72), the heat amount of the heater 73 is transferred to the pressure roller 71 through the fixing roller 72. As a result, the pressure roller 71 is heated.
Even when the pressure roller 71 and the fixing roller 72 are not rotationally driven, a part of the heat amount of the heater 73 is transferred to the pressure roller 71. However, the heat transfer amount in this case is small, and the entire pressure roller 71 cannot be heated. For this reason, in the present embodiment, the movement of the heat amount when the pressure roller 71 and the fixing roller 72 are not rotationally driven is ignored, that is, when the pressure roller 71 and the fixing roller 72 are not rotationally driven. The pressure roller 71 is handled as not heated.

  Then, the fixing device 70 is placed on the printing paper at the nip portion N in a state where the pressure roller 71 is heated to a predetermined temperature (minimum necessary temperature capable of performing the process of fixing the toner image on the printing paper) or higher. The toner image is fixed on the printing paper by heating and pressurizing the toner image.

  In the printing unit 5 configured as described above, the surface of the photosensitive drum 10 is charged by the charger 20, and laser light is irradiated to the charged photosensitive drum 10 by the laser scanning unit 30. As a result, an electrostatic latent image is formed on the photosensitive drum 10. Thereafter, the electrostatic latent image is developed by the developing device 40, and the developed toner image is transferred onto the printing paper. Then, the fixing device 70 fixes the toner image on the printing paper, thereby performing printing.

  Returning to FIG. 1, the control unit 80 of the printing unit 5 (hereinafter referred to as the printing control unit 80), based on the instruction from the main control unit 6 as described above, the photosensitive drum 10, the charger 20, the laser scanning. The unit 30, the developing device 40, the cleaning unit 50, the fixing device 70, and the like are controlled.

Further, in the copying machine S <b> 1 of the present embodiment, the print control unit 80 performs a warm-up process based on an instruction from the control unit 6. This warm-up process is a process for making the image formable at a timing such as when the copier S1 is turned on, when the energy saving mode is released, or when the jam process is completed.
During this warm-up process, the print controller 80 requires the minimum required temperature (hereinafter simply referred to as the minimum required) to enable the pressure roller 71 of the fixing device 70 to perform the process of fixing the toner image. Heated by the amount of heat of the heater 73 up to the above). Specifically, the print control unit 80 rotates and drives the pressure roller 71 and the fixing roller 72, so that the heat amount of the heater 73 disposed inside the fixing roller 72 is transferred via the fixing roller 72. The pressure roller 71 is heated to the minimum required temperature or more by transferring heat to the above.
When the warm-up process is completed, the rotational driving of the pressure roller 71 and the fixing roller 72 is stopped, and the pressure roller 71 is gradually cooled.

FIG. 4 is a graph showing the temperature change of the pressure roller 71 when the heating temperature of the pressure roller 71 is T1, T2, T3, and T4 in the warm-up process (however, T1>T2>T3> T4). The horizontal axis represents time, and the vertical axis represents the temperature of the pressure roller 71.
As shown in FIG. 4, even when the heating temperature of the pressure roller 71 is set to any of T1, T2, T3, and T4, the temperature of the pressure roller 71 rises to the set temperature and then converges. The temperature drops to a temperature lower than the temperature T0, and then reaches a convergence temperature T0. The reason why the temperature of the pressure roller 71 decreases below the convergence temperature T0 is that the atmospheric temperature to which the pressure roller 71 is exposed due to the heat generated by the heater 73 gradually increases with time. This is because the atmospheric temperature at the time when the heating of the pressure roller 71 is about to start is low.

When the heating temperature of the pressure roller 71 is T1, it is assumed that the temperature of the pressure roller 71 exceeds the minimum required temperature Tmin in all periods after the temperature exceeds the minimum required temperature Tmin once.
When the heating temperature of the pressure roller 71 is T2, it is assumed that the temperature of the pressure roller 71 exceeds the minimum required temperature Tmin until time ta after the minimum required temperature Tmin is exceeded once.
When the heating temperature of the pressure roller 71 is T3, it is assumed that the temperature of the pressure roller 71 exceeds the minimum required temperature Tmin until time tb after the temperature exceeds the minimum required temperature Tmin once.
When the heating temperature of the pressure roller 71 is T4, it is assumed that the temperature of the pressure roller 71 exceeds the minimum required temperature Tmin until time tc after it once exceeds the minimum required temperature Tmin.
In FIG. 4, ta>tb> tc.

In the copying machine S1 of the present embodiment, when performing the warm-up process, the printing control unit 80 performs the pressure roller in the warm-up process according to the transition time from the completion of the warm-up process to the transition to the energy saving mode. The heating temperature of 71 is adjusted.
Here, the energy saving mode is a mode in which the copying machine S1 is placed in a standby state to reduce power consumption, and the heat generation by the heater 73 is interrupted. The transition time from the completion of the warm-up process to the transition to the energy saving mode is a value set in advance by the user via the display operation unit 1, and can be set, for example, in units of one minute. Stored in the unit 80.

Specifically, the printing control unit 80 sets the pressure roller 71 in the warm-up process so that the temperature of the pressure roller 71 when shifting to the energy saving mode exceeds the minimum required temperature and approaches the minimum required temperature. Determine the heating temperature.
That is, when the transition time from the completion of the warm-up process to the transition to the energy saving mode is ta or more, the print control unit 80 determines the heating temperature of the pressure roller 71 in the warm-up process as T1, When the transition time from the completion of the warm-up process to the transition to the energy saving mode is tb or more and shorter than ta, the heating temperature of the pressure roller 71 in the warm-up process is determined as T2, and the warm-up process is completed after the warm-up process is completed. When the transition time until the transition to the energy mode is not less than tc and shorter than tb, the heating temperature of the pressure roller 71 in the warm-up process is determined as T3, and from the completion of the warm-up process to the transition to the energy saving mode Is shorter than tc, the heating temperature of the pressure roller 71 in the warm-up process is set to T It is determined to be.

  In the copying machine S1 of the present embodiment, the print control unit 80 rotates the pressure roller 71 and the fixing roller 72 during the warm-up process (that is, the pressure roller 71 is rotated with respect to the fixing roller 72). The heating temperature of the pressure roller 71 is adjusted by adjusting (time).

Further, in the copying machine S1 of the present embodiment, the print control unit 80 stores the minimum required temperature corresponding to the type of printing paper used in the copying machine S1, and the pressure roller 71 is based on the minimum required temperature. Adjust the heating temperature. Note that the copying machine S1 of the present embodiment can feed printing paper from the paper cassette 7a, the paper cassette 7b, and the paper feed tray 8, and therefore can use a maximum of three types of printing paper. For this reason, the print control unit 80 adjusts the heating temperature of the pressure roller 71 based on the highest minimum required temperature among the minimum required temperatures stored in advance corresponding to the three types of printing paper.
That is, Tmin shown in FIG. 4 is the highest minimum required temperature among the minimum required temperatures corresponding to the three types of printing paper. Therefore, the toner image can be reliably fixed on any printing paper. Then, specific values of ta, tb, and tc are calculated on the basis of Tmin that is set to the highest minimum required temperature, and ta, tb, tc, and a transition time until a transition to a preset energy saving mode is performed. Accordingly, the heating temperature of the pressure roller 71 is adjusted.
The minimum required temperature here may be a minimum temperature at which the toner image can be physically fixed on the printing paper. However, in this case, printing failure occurs when the temperature of the pressure roller 71 fluctuates for some reason and falls below the minimum required temperature. For this reason, it is preferable to set the minimum required temperature higher than the minimum temperature at which the toner image can be physically fixed on the printing paper.
The minimum required temperature corresponding to the type of print paper may be set based on the relationship between the print paper type stored in advance and the minimum required temperature based on the type of print paper input by the user through the display operation unit 1. It can be set by the worker at the time of factory shipment.

  Returning to FIG. 1, the control unit 6 controls the entire copying machine S1 of the present embodiment. The display operation unit 1, the image reading unit 2, the image storage unit 3, the image processing unit 4, and the printing unit 5 are electrically connected.

  In the copying machine S1 having the above configuration, after the warm-up process is completed, the copying machine S1 is set in the image reading unit 2 under the control of the control unit 6 based on the operation of the display operation unit 1 by the user. The image data of the original is read, and the read image data is stored in the image storage unit 3. The image data stored in the image storage unit 3 is converted into image data in a print format by the image processing unit 4 and input to the printing unit 5. Then, the printing unit 5 forms an image on a print sheet based on the print format image data input from the image processing unit 4. Thereafter, the printing paper on which the image is formed is discharged as a printed matter to the outside of the copying machine S1.

  Next, the operation including the warm-up process and the shift to the energy saving mode in the copying machine S1 of the present embodiment will be described with reference to the flowchart of FIG. In this description, it is assumed that image formation on the printing paper is not performed between the warm-up process and the transition to the energy saving mode.

  First, the transition time is set (step S1). The transition time is set by the user inputting an instruction using the display operation unit 1 and storing the input instruction in the print control unit 80.

  Subsequently, the heating temperature of the pressure roller 71 in the warm-up process is determined (step S2). Specifically, the print controller 80 determines the heating temperature of the pressure roller 71 in the warm-up process from the minimum required temperature stored in advance and the transition time set in step S1.

  Subsequently, a warm-up process is performed (step S3). Here, the printing control unit 80 rotationally drives the pressure roller 71 and the fixing roller 72 for a predetermined time so that the pressure roller 71 is heated to the heating temperature determined in step S2.

Subsequently, the process shifts to the energy saving mode (step S4). And if it transfers to energy saving mode, heat_generation | fever of the heater 73 will be interrupted and consumption of energy will be suppressed.
The pressure roller 71 is not heated from the warm-up process to the energy saving mode, but the pressure roller 71 is heated in step S3 by the temperature determined in step S2. Therefore, the temperature of the pressure roller 71 is maintained above the minimum required temperature.

According to the copying machine S1 of the present embodiment, the heating temperature of the pressure roller 71 in the warm-up process is adjusted according to the transition time from the completion of the warm-up process to the transition to the energy saving mode.
For this reason, when the transition time is short, the heating of the pressure roller 71 is adjusted so that the heating temperature of the pressure roller 71 is relatively low. When the transition time is long, the heating of the pressure roller 71 is adjusted. The heating of the pressure roller 71 can be adjusted so that the temperature becomes relatively high.
That is, according to the present invention, an optimum energy amount corresponding to the transition time can be input to the pressure roller 71. According to the copying machine S1 of the present embodiment, it is possible to reduce energy consumption in the copying machine and further save energy in the copying machine.

  FIG. 6 is a table showing the relationship between the transition time and the heating time of the pressure roller 71. As can be seen from this figure, when the heating temperature of the pressure roller 71 is adjusted to be relatively low (when the transition time is set short), the heating time of the pressure roller 71 is shortened. For this reason, it is possible to shorten the time until the warm-up process is completed.

  Further, in the copying machine S1 of the present embodiment, the temperature of the pressure roller 71 when the heating temperature of the pressure roller 71 in the warm-up process is shifted to the energy saving mode exceeds the minimum required temperature and is closest to the minimum required temperature. Has been determined. For this reason, it is possible to reduce the energy input to the heating of the pressure roller as much as possible.

  Further, in the copying machine S1 of the present embodiment, the temperature of the pressure roller 71 is adjusted using the minimum required temperature set according to the type of printing paper. For this reason, in the case of printing paper on which the toner image can be fixed at a low temperature, the heating temperature of the pressure roller 71 can be further lowered in the warm-up process. Therefore, further energy saving can be achieved.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and design changes and the like can be made without departing from the scope of the present invention. .

For example, in the above embodiment, a copying machine has been described as an example of the image forming apparatus of the present invention.
However, the image forming apparatus may be a facsimile machine or a multifunction machine.
Further, the present invention can be applied to a so-called tandem type copying machine including the photosensitive drum 10 for each color.

  The image forming apparatus of the present invention can also be applied to a copying machine that once transfers a toner image developed on a photosensitive drum to an intermediate transfer member and transfers the toner image from the intermediate transfer member to a recording sheet.

The pressure member of the present invention is not limited to the pressure roller, and may be a pressure belt.
The fixing member of the present invention is not limited to the fixing roller, and may be a fixing belt.
Further, the heat generating means of the present invention does not need to be disposed inside the fixing roller, and may be disposed outside the fixing roller.

  Further, the print control unit 80 may determine the heating temperature of the pressure roller in consideration of the type of warm-up process as in the prior art.

  Further, a temperature sensor for detecting the temperature of the pressure roller 71 may be further provided so that the print control unit 80 can directly acquire the temperature of the pressure roller 71.

1 is a block diagram illustrating a functional configuration of a copying machine according to an embodiment of the present invention. 1 is a cross-sectional view schematically showing a schematic configuration of a copying machine according to an embodiment of the present invention. 1 is a schematic diagram illustrating a schematic configuration of a fixing device provided in a copying machine according to an embodiment of the present invention. 5 is a graph showing a temperature change of a pressure roller provided in a copying machine according to an embodiment of the present invention. 6 is a flowchart for explaining the operation of the copying machine according to the embodiment of the present invention. Table showing relationship between transfer time of copying machine and heating time of pressure roller in one embodiment of the present invention

Explanation of symbols

  S1... Copier (image forming apparatus) 70... Fixing device (fixing means) 71... Pressure roller (pressure member) 72. ), 80 ... Print control section (control means)

Claims (5)

Fixing means for fixing the toner image on the recording medium by heating and pressurizing a toner image on the recording medium at a nip formed by a pressure member and a fixing member which are heated by transferring the amount of heat of the heat generating means; An image forming apparatus comprising: a control unit that controls the fixing unit;
The control is performed when a warm-up process is performed in which the pressure member is heated by the amount of heat of the heat generating unit to a temperature higher than the minimum necessary temperature of the pressure member necessary to enable the step of fixing the toner image. The means adjusts the heating temperature of the pressure member in the warm-up process according to the transition time from the completion of the warm-up process to the transition to the energy saving mode in which the heat generation of the heat generating means is interrupted. An image forming apparatus.   The control means sets the heating temperature of the pressure member in the warm-up process so that the temperature of the pressure member when shifting to the energy saving mode exceeds the minimum required temperature and approaches the minimum required temperature. The image forming apparatus according to claim 1, wherein the image forming apparatus is determined.   When the amount of heat of the heat generating means can be transferred to the pressure member through the fixing member by moving the pressure member relative to the fixing member, the control means 3. The image forming apparatus according to claim 1, wherein the heating temperature of the pressure member is adjusted by adjusting a moving time of the pressure member.   The image forming apparatus according to claim 1, wherein the control unit adjusts a heating temperature of the pressure member using the minimum required temperature corresponding to a type of the recording medium. When a plurality of types of recording media can be used and the minimum required temperature differs for each type of recording medium, the control means adjusts the heating temperature of the pressure member using the highest minimum required temperature. The image forming apparatus according to claim 4.

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