JP5762324B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus including a storage unit that stores an image forming medium.

  Some image forming apparatuses such as multifunction peripherals, copiers, and printers include a paper feed cassette (accommodating unit) that accommodates paper (image forming medium). In such an image forming apparatus, the sheets stored in the sheet feeding cassette are conveyed one by one to the engine unit, and an image is formed on the sheet in the engine unit. By the way, in the image forming apparatus, when the paper accommodated in the paper feed cassette absorbs moisture, an image formed on the paper in the engine unit may be abnormal (abnormal image) such as crushing or blurring. For this reason, some image forming apparatuses place a humidity sensor and a heater near the paper feed cassette, and dehumidify the paper by heating the heater based on the humidity measured by the humidity sensor ( Patent Document 1).

JP 2001-125473 A

  When the user uses the image forming apparatus, it is desired to immediately execute the operation without waiting for the user. For example, when an image forming apparatus is installed in an office, it is desired that the image forming apparatus is in a state in which normal operation can be performed immediately from the business start time. However, since the image forming apparatus described in Patent Document 1 is considered to be activated by the user after the work start time, the image forming apparatus cannot be immediately used after the work start time. In this case, since the image forming apparatus makes the user wait, the user is uncomfortable.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus that can suppress discomfort to a user when performing dehumidification.

  The present invention is a storage unit that stores an image forming medium, and a heating unit that heats the image forming medium stored in the storage unit, and the heating temperature depends on the magnitude of the supplied power The temperature-changing heating unit, the humidity measuring unit for measuring the humidity of the image-forming medium accommodated in the housing unit, the humidity data relating to the humidity in a plurality of regions, and the image-forming medium heated by the heating unit. A storage unit that stores humidity change data indicating a change in humidity of the image forming medium when heated, and setting a selected region based on selection of one of the plurality of regions A setting unit for setting the activation time of the image forming apparatus, and humidity data corresponding to the region set by the setting unit so that the humidity of the image forming medium reaches a target humidity targeted at the activation time And by the setting unit Based on the set start time and the humidity change data, a determination unit that determines a start time for starting heating of the image forming medium by the heating unit, and a target measured by the humidity measurement unit. Based on the humidity of the image forming medium and the humidity change data, a determination unit that determines whether or not the humidity of the image forming medium reaches the target humidity at the startup time, and the determination unit determines When the start time is reached, the first electric power is supplied to the heating unit so as to start the heating of the image forming medium, and the first electric power is supplied to the heating unit. When the determination unit determines that the humidity of the image forming medium does not reach the target humidity at the start-up time, in order to increase the heating temperature of the heating unit, the second power larger than the first power is set. 2 power before A heating control unit to supply the heating unit, an image forming apparatus including the.

  ADVANTAGE OF THE INVENTION According to this invention, when performing dehumidification, the image forming apparatus which can suppress giving a user discomfort can be provided.

1 is a diagram illustrating an overall configuration of a copier according to an embodiment of an image forming apparatus. 2 is a block diagram illustrating a functional configuration of a copier. FIG. FIG. 4 is a block diagram illustrating details of a paper transport unit and a control unit. 6 is a flowchart for explaining the operation of the copier.

  A copier according to an embodiment of an image forming apparatus of the present invention will be described below with reference to the drawings. First, the overall configuration of the copy machine 1 will be described. FIG. 1 is a diagram for explaining an overall configuration of a copier 1 according to an embodiment of an image forming apparatus.

As shown in FIG. 1, the copier 1 of the present embodiment includes a document transport unit 10, a document reading unit 20, a paper transport unit 30, an image forming unit 40, a transfer unit 50, and a fixing unit 60. Prepare.
The document transport unit 10 is an ADF (Automatic Document Feeder), and includes a document placement unit 11, a first feed roller 12, a guide 13, a timing roller pair 14, and a document discharge unit 15. The first feed roller 12 supplies the document G placed on the document placement unit 11 to the timing roller pair 14 one by one in order. The timing roller pair 14 is a timing at which the document reading unit 20 reads an image of the document G and a timing at which the document G is supplied to a position where the image of the document G is read by the document reading unit 20 (a position where the guide 13 is disposed). In order to match, the conveyance of the original G or the conveyance stop of the original G is performed. The guide 13 guides the conveyed document G to a first reading surface 21a described later. The document discharge unit 15 discharges the document G whose image has been read by the document reading unit 20 (passed through the guide 13) to the outside of the copier body 2.
A document stacking unit 16 is formed outside the copying machine main body 2 in the document discharge unit 15. In the document stacking unit 16, the documents G discharged from the document discharge unit 15 are stacked and stacked.

  The document reading unit 20 includes a first reading surface 21a and a second reading surface 22a. The first reading surface 21 a is formed along the upper surface of the first contact glass 21 disposed to face the guide 13 and serves as a surface for reading an image of the document G. The second reading surface 22a is disposed adjacent to the first reading surface 21a (in the case shown in FIG. 1, over the most right side of the first reading surface 21a). The second reading surface 22 a is used when reading an image of the document G without using the document transport unit 10. The second reading surface 22a is formed along the upper surface of the second contact glass 22 on which the document G is placed, and serves as a surface for reading an image of the document G.

  The document reading unit 20 includes an illumination unit 23, a first mirror 24, a second mirror 25, a third mirror 26, an imaging lens 27, and an imaging unit 28 inside the copier body 2. . The illumination unit 23 and the first mirror 24 move in the sub-scanning direction X, respectively. The second mirror 25 and the third mirror 26 are disposed on the left side of the illumination unit 23 and the first mirror 24 in FIG. Further, the second mirror 25 and the third mirror 26 are the first reading surface 21 a or the second reading surface 22 a through the first mirror 24, the second mirror 25, the third mirror 26, and the imaging lens 27. To the imaging unit 28 while moving in the sub-scanning direction X while keeping the distance (optical path length) constant.

  The illumination unit 23 is a light source that irradiates the original G with light. The first mirror 24, the second mirror 25, and the third mirror 26 are mirrors for guiding the light reflected by the document G to the imaging lens 27 while keeping the optical path length constant. The imaging lens 27 focuses the light incident from the third mirror 26 on the imaging unit 28. The imaging unit 28 is an imaging device for obtaining image data based on an imaged optical image by converting incident light into an electrical signal. For example, the imaging unit 28 is a CCD (Charge Coupled Device) or a CMOS (Complementary). It is an image sensor such as Metal Oxide Semiconductor).

The paper transport unit 30 includes a second feed roller 31, a third feed roller 32, a registration roller pair 33, and a paper discharge unit 34. The second feed roller 31 supplies paper T (image forming medium) stored in the paper feed cassette 36 to the transfer unit 50. The third feed roller 32 supplies the paper T (image forming medium) placed on the manual feed tray 37 to the transfer unit 50. The registration roller pair 33 performs the conveyance of the paper T or the conveyance stop of the paper T in order to match the timing when the toner image reaches the transfer unit 50 and the timing when the paper T is supplied to the transfer unit 50. Further, the registration roller pair 33 performs skew (oblique feeding) correction of the paper T. The paper discharge unit 34 discharges the paper T on which the toner image is fixed to the outside of the copier body 2.
A paper discharge stacking unit 35 is formed outside the copier body 2 in the paper discharge unit 34. In the paper discharge stacking unit 35, the paper T discharged from the paper discharge unit 34 is stacked and stacked.

The image forming unit 40 is for forming a toner image. The image forming unit 40 includes a photosensitive drum 41, a charging unit 42, a laser scanner unit 43, a developing device 44, a cleaning unit 45, a toner cartridge 46, 1 A next transfer roller 47, an intermediate transfer belt 48, and a counter roller 49 are provided.
The photoconductor drum 41 (41a, 41b, 41c, 41d) functions as a photoconductor or an image carrier in order to form toner images of black, cyan, magenta, and yellow, respectively. Around each photosensitive drum 41a, 41b, 41c, 41d, in order from the upstream side to the downstream side along the rotation direction of the photosensitive drum 41, a charging unit 42, a laser scanner unit 43, a developing device 44, A cleaning unit 45 is disposed. The charging unit 42 charges the surface of the photosensitive drum 41. The laser scanner unit 43 is arranged apart from the surface of the photosensitive drum 41 and scans and exposes the surface of the photosensitive drum 41 based on image data relating to the original G read by the original reading unit 20. As a result, the exposed portion of the charge is removed from the surface of the photosensitive drum 41 to form an electrostatic latent image. The developing device 44 forms a toner image by attaching toner to the electrostatic latent image formed on the surface of the photosensitive drum 41. The cleaning unit 45 removes toner and the like remaining on the surface of the photosensitive drum 41 after the surface of the photosensitive drum 41 is neutralized by a static eliminator (not shown).
The toner cartridge 46 stores toner of each color supplied to the developing device 44. The toner cartridge 46 and the developing device 44 are connected by a toner supply path (not shown).

  The primary transfer rollers 47 (47a, 47b, 47c, 47d) are arranged on the opposite sides of the intermediate transfer belt 48 from the photosensitive drums 41a, 41b, 41c, 41d, respectively. The intermediate transfer belt 48 is a belt that passes through the image forming unit 40 and the transfer unit 50. A part of the intermediate transfer belt 48 is sandwiched between the photosensitive drums 41a, 41b, 41c, and 41d and the primary transfer rollers 47a, 47b, 47c, and 47d, and the photosensitive drums 41a, 41b, 41c, and 41d. The toner image formed on the surface is primarily transferred. The opposing roller 49 is a driving roller that is disposed inside the intermediate transfer belt 48 having an annular shape, and advances the intermediate transfer belt 48 in the direction of arrow A shown in FIG.

  The transfer unit 50 includes a secondary transfer roller 51. The secondary transfer roller 51 is disposed on the side opposite to the counter roller 49 with respect to the intermediate transfer belt 48, and a part of the intermediate transfer belt 48 is sandwiched between the counter roller 49. Further, the secondary transfer roller 51 secondarily transfers the toner image primarily transferred to the intermediate transfer belt 48 onto the paper T.

  The fixing unit 60 includes a heating rotator 61 and a pressure rotator 62. The heating rotator 61 and the pressure rotator 62 sandwich the paper T on which the toner image is secondarily transferred, melt and pressurize the toner, and fix the toner to the paper T.

Next, the functional configuration of the copy machine 1 will be described. FIG. 2 is a block diagram showing a functional configuration of the copy machine 1. FIG. 3 is a block diagram showing details of the paper transport unit 30 and the control unit 90.
The copier 1 includes the above-described components (the document transport unit 10, the document reading unit 20, the paper transport unit 30, the image forming unit 40, the transfer unit 50, and the fixing unit 60). The engine unit 3 is configured by the paper transport unit 30, the image forming unit 40, the transfer unit 50, and the fixing unit 60. The description of the document conveying unit 10, the document reading unit 20, the image forming unit 40, the transfer unit 50, and the fixing unit 60 will be omitted with reference to FIGS.
Further, the copier 1 includes an operation unit 70, a storage unit 80, a time measuring unit 100, and a control unit 90 in addition to the functional configuration described above.

  The operation unit 70 includes a numeric keypad (not shown), a touch panel (not shown), a start key (not shown), and the like. The numeric keypad is operated to input numbers such as the number of copies to be printed. The touch panel displays a plurality of keys to which various functions (for example, a function for setting a print magnification and a function for allocating a plurality of pages to one sheet of paper T (such as 2 in 1)) are assigned. A key displayed on the touch panel is operated to cause the copier 1 to execute any of various functions. The start key is operated to execute printing. When any key is operated, the operation unit 70 supplies a signal indicating that this key has been operated to the control unit 90.

  The storage unit 80 includes a hard disk, a semiconductor memory, and the like. The storage unit 80 stores image data based on the document G read by the document reading unit 20. Further, the storage unit 80 stores a control program used in the copier 1, data used by the control program, and the like.

  The storage unit 80 stores humidity data, humidity change data, and heating data. Humidity data is data relating to the humidity of each of a plurality of regions. The plurality of regions are, for example, Japan, Germany, France, the United Kingdom, the United States, etc. (large category), or Tokyo, Osaka, Kyoto, Fukuoka, etc. (medium category). The humidity recorded in the humidity data is, for example, the average humidity for each month or season. The humidity change data is data indicating a change in the humidity of the paper T when the paper T is heated by a heating unit 301 described later. That is, the humidity change data is data indicating the relationship between the humidity and the heating time for each heating temperature. The heating data is data indicating the relationship between the power supplied to the heating unit and the heating temperature of the heating unit 301 when the power is supplied.

  The timekeeping unit 100 is composed of, for example, a real-time clock and the like, and measures the current time.

As shown in FIG. 3, the paper transport unit 30 further includes a heating unit 301 and a humidity measurement unit 303.
The heating unit 301 heats the paper T stored in the paper feed cassette 36. Furthermore, the heating temperature of the heating unit 301 changes according to the magnitude of the supplied power. As a specific example, the heating unit 301 is disposed on a metal plate or the like disposed in the vicinity of the paper feed cassette 36, and heats the entire sheet T by transferring heat to the metal plate. It is like that.

  The humidity measuring unit 303 is a humidity sensor disposed in the vicinity of the paper feed cassette 36. The humidity measuring unit 303 measures the humidity of the paper T stored in the paper feed cassette 36.

The control unit 90 controls the document conveying unit 10, the document reading unit 20, the engine unit 3, the operation unit 70, and the like.
As illustrated in FIG. 3, the control unit 90 includes a setting unit 91, a determination unit 92, a determination unit 94, a heating control unit 93, and a correction unit 96.

The setting unit 91 sets a selected region based on selection of one of a plurality of regions. That is, the setting unit 91 sets the selected region as the selected region when one of a plurality of regions corresponding to the humidity data stored in the storage unit 80 is selected by the user.
Further, the setting unit 91 sets the start time of the copier 1. In other words, the setting unit 91 sets the time when the copy machine 1 is started, as a specific example, when the copy machine 1 is installed in the office, as the start time.

  The determination unit 92 includes humidity data corresponding to the area set by the setting unit 91 and the activation time set by the setting unit 91 so that the humidity of the paper T reaches the target target humidity at the activation time. Based on the humidity change data, the heating unit 301 determines the start time for starting the heating of the paper T.

  As described above, the copying machine 1 may generate an abnormal image when the paper T stored in the paper feed cassette 36 absorbs moisture. For this reason, the copier 1 needs to dehumidify the paper T before forming an image on the paper T. For example, if the dehumidification of the paper T is started after the start time of the office has elapsed, the dehumidification is performed. Cannot be used until completed. Therefore, it is desired that the copying machine 1 completes the dehumidification of the paper T by causing the humidity of the paper T to reach the target humidity by the start time (starting time).

  In order to satisfy such a request, the determination unit 92 obtains the humidity (humidity of the paper T) of the environment in which the copier 1 is installed from the humidity data, and based on the obtained humidity and humidity change data. Thus, the start time for starting the heating by the heating unit 301 is determined by calculating backward from the activation time. In this case, since the heating temperature of the heating unit 301 is set to a predetermined temperature, the determination unit 92 selects humidity change data corresponding to the heating temperature (predetermined temperature). In addition, the determination unit 92 may determine a start time for each month or season, and store data regarding the determined start time in the storage unit 80.

  The determination unit 94 determines whether or not the humidity of the paper T reaches the target humidity at the start time based on the humidity of the paper T measured by the humidity measurement unit 303 and the humidity change data. It is preferable that the determination unit 94 intermittently determines whether or not the humidity of the paper T reaches the target humidity. As a specific example, the determination unit 94 preferably makes the above determination at a time intermediate between the start time and the start time. Thereby, the determination part 94 can reduce a process and can reduce power consumption compared with the case where said determination is always performed.

  The heating control unit 93 supplies the first electric power to the heating unit 301 so as to start the heating of the paper T when the start time determined by the determination unit 92 is reached. That is, the heating control unit 93 is preset for the heating unit 301 so as to heat the paper T at a predetermined temperature when the time measured by the time measuring unit 100 reaches the start time. A first power is supplied.

  When the start time determined by the determination unit 92 is stored in the storage unit 80 as described above, the heating control unit 93 stores the storage unit during the month or season in which the start time is determined by the determination unit 92. The start time may be obtained by reading data relating to the start time stored in 80. As a result, the determination unit 92 does not need to determine the start time every day, so that the processing is reduced.

Further, the heating control unit 93 supplies the first electric power to the heating unit 301 and then determines that the humidity of the paper T does not reach the target humidity at the starting time after the determination unit 94 determines that the heating unit 301 does not reach the target humidity. In order to increase the heating temperature of 301, the second power larger than the first power is supplied to the heating unit 301. Here, the heating control unit 93 performs the first operation based on the humidity measured by the humidity measuring unit 303, the heating data stored in the storage unit 80, and the humidity change data stored in the storage unit 80. The power value of 2 is set as appropriate. When the second power is supplied, the heating unit 301 heats the paper T at a higher temperature than when the first power is supplied. As a result, the paper T is dehumidified faster than when the first power is supplied to the heating unit 301.
Furthermore, the heating control unit 93 stops the power supply to the heating unit 301 when the activation time is reached.

  The correction unit 96 corrects the humidity data stored in the storage unit 80 based on the humidity measured by the humidity measurement unit 303. That is, the correction unit 96 acquires the humidity of the paper T before the start time from the humidity measurement unit 303. For example, the correction unit 96 can acquire the humidity of the paper T from the humidity measurement unit 303 every time the copy machine 1 is activated. Further, the correction unit 96 determines whether or not the average humidity obtained by averaging the plurality of acquired humidity values is different from the humidity recorded in the humidity data. Further, the correction unit 96 may determine whether the average humidity is included in a predetermined humidity range including the humidity of the humidity data when the difference between the average humidity and the humidity of the humidity data is determined. When the average humidity and the humidity of the humidity data are different (when the predetermined humidity range does not include the average humidity), the correction unit 96 converts the humidity data into the average humidity in order to correct the humidity data. replace. Note that, when the humidity data is corrected by the correction unit 96, the determination unit 92 determines the start time again based on the corrected humidity data.

  Next, the operation of the copy machine 1 in this embodiment will be described. FIG. 4 is a flowchart for explaining the operation of the copying machine 1.

  In step ST1, the setting unit 91 sets the selected area based on the fact that one of the plurality of areas is selected by the user.

  In step ST <b> 2, the setting unit 91 sets the time input to the copy machine 1 based on the operation of the operation unit 70 by the user as the start time of the copy machine 1.

  In step ST3, the determination unit 92 causes the heating unit 301 to perform the paper T based on the humidity data corresponding to the area set in step ST1, the activation time set in step ST2, and the humidity change data. Determine the time to start heating.

  In step ST4, the heating control unit 93 determines whether or not the time (timed time) measured by the time measuring unit 100 has reached the start time determined in step ST3. If the measured time has not reached the start time (No), the determination in step ST4 is performed again. If the timed time has reached the start time (Yes), the process proceeds to step ST5.

  In step ST <b> 5, the heating control unit 93 supplies the first power to the heating unit 301. Thereby, the heating unit 301 starts heating in order to dehumidify the paper T.

  In step ST6, the determination unit 94 determines whether the humidity of the paper T reaches the target humidity at the start time based on the humidity of the paper T measured by the humidity measurement unit 303 and the humidity change data. To do. If the humidity does not reach the target humidity at the start time (No), the process proceeds to step ST7. When the humidity reaches the target humidity at the start time (Yes), the warming control unit 93 controls the warming unit 301 to continue the warming of the paper T until the timed time reaches the start time, Thereafter, the process ends.

  In step ST <b> 7, the heating control unit 93 supplies the second power to the heating unit 301. Thereby, the heating temperature of the heating part 301 rises. And the speed which dehumidifies the paper T becomes quicker than the case where 1st electric power is supplied.

As described above, according to the copying machine 1 of the present embodiment, the following effects are produced.
That is, the copy machine 1 according to the present embodiment sets one of a plurality of areas, and sets the start time of the copy machine 1 and the area set by the setting unit 91. The start time for starting the heating of the paper T by the warming unit 301 based on the humidity data to be started, the start time, and the humidity change data, and the time measured by the time measuring unit 100 is started. And a heating control unit 93 that controls the heating unit 301 to start heating the paper T when the time comes. As a result, the copying machine 1 completes dehumidification of the paper T by the activation time, so that the user does not wait for the use of the copying machine 1 after the activation time. Therefore, the copying machine 1 can suppress giving a user a discomfort.

  Further, the copy machine 1 stops supplying power to the heating unit 301 when the start time is reached. Thereby, the copy machine 1 can prevent the power consumption from increasing due to the power supplied to the heating unit 301 even after reaching the target humidity.

  Further, the copying machine 1 of the present embodiment determines the start time based on the humidity data stored in the storage unit 80. If the start time is determined based on the humidity (actual value) measured by the humidity measuring unit 303, the copying machine measures the humidity by the humidity measuring unit 303 every time it is started, and the measurement is performed. It is necessary to determine the start time based on the humidity. In this case, the processing load on the copying machine (determination unit) increases. In this respect, since the copying machine 1 of the present embodiment uses the humidity data stored in the storage unit 80 when determining the start time, it is not necessary to determine the start time each time it is activated. That is, the copy machine 1 of the present embodiment can divert the start time determined by the determination unit 92 every time activation is performed. Therefore, the copying machine 1 according to the present embodiment can reduce the processing burden on the determination unit 92.

  Further, the copying machine 1 determines whether or not the humidity of the paper T reaches the target humidity at the start time based on the humidity of the paper T measured by the humidity measuring unit 303 and the humidity change data. 94. In the copying machine 1, after the first power is supplied to the heating unit 301 by the heating control unit 93, the determination unit 94 determines that the humidity of the paper T does not reach the target humidity at the start time. In addition, in order to increase the heating temperature of the heating unit 301, the heating control unit 93 supplies the second power larger than the first power to the heating unit 301. Thereby, even when the humidity of the paper T is higher than the humidity based on the humidity data, the copier 1 can easily make the humidity of the paper T reach the target humidity at the start time.

  Further, the copier 1 corrects the humidity data stored in the storage unit 80 based on the humidity measured by the humidity measuring unit 303. Thereby, the copy machine 1 can set the start time according to the environment in which the copy machine 1 is installed.

In addition, this invention is not limited to embodiment mentioned above, It can implement with a various form.
The copier 1 of the present embodiment is a color copier, but is not limited to this form and may be a monochrome copier.
In the copying machine 1 of the present embodiment, the toner image is transferred to the paper T via the intermediate transfer belt 48 (indirect transfer method). However, the present invention is not limited to this form, and is formed on the photosensitive drum. The transferred toner image may be directly transferred to the paper T (direct transfer method).
The copier 1 of the present embodiment is configured to print one side of the paper T, but is not limited to this, and may be configured to print both sides of the paper.

Further, the image forming apparatus of the present invention is not limited to the copying machine 1 described above. In other words, the image forming apparatus of the present invention may be a multi-function machine having a copy function, a facsimile function, a printer function, and a scanner function, or may be a facsimile or a printer.
The image forming medium on which the toner image is fixed by the image forming apparatus of the present invention is not limited to the paper T, and may be a film sheet such as an OHP (overhead projector) sheet.

DESCRIPTION OF SYMBOLS 1 ... Copy machine (image forming apparatus) 91 ... Setting part 92 ... Determination part 93 ... Heating control part 94 ... Judgment part 96 ... Correction part 301 ... Heating part 303 ... Humidity measurement part

Claims (2)

An accommodating portion for accommodating an image forming medium;
A heating unit for heating the image forming medium stored in the storage unit, wherein the heating temperature changes according to the magnitude of the supplied power;
A humidity measuring unit for measuring the humidity of the image forming medium accommodated in the accommodating unit;
It is data relating to humidity in a plurality of areas, and shows humidity data indicating the average humidity for each month or season , and changes in humidity of the image forming medium when the image forming medium is heated by the heating unit. Humidity change data indicating the relationship between humidity and heating time for each heating temperature, power supplied to the heating unit, and the heating when the power is supplied to the heating unit. A storage unit for storing heating data indicating a relationship with a heating temperature of the heating unit;
A setting unit configured to set a selected region based on selection of one of the plurality of regions and to set an activation time of the image forming apparatus;
The humidity of the environment in which the image forming apparatus is installed is acquired from the humidity data corresponding to the region set by the setting unit so that the humidity of the image forming medium reaches the target target humidity at the startup time. Then, by associating the acquired humidity with the humidity of the relationship indicated by the humidity change data, the heating is calculated from the relationship between the heating time of the relationship indicated by the humidity change data and the activation time set by the setting unit. A determining unit that determines a start time for starting heating of the image forming medium by the unit;
And humidity of the image forming medium to be measured by the humidity measurement unit, the based on the humidity change data, whether moisture of the image forming medium at the start time reaches the target humidity, the warming A determination unit that intermittently determines when the image forming medium is heated by the unit;
When the start time determined by the determination unit is reached, the first power is supplied to the heating unit so as to start heating the image forming medium, and the first power is supplied to the heating unit. After supplying power, when the determination unit determines that the humidity of the image forming medium does not reach the target humidity at the activation time, the humidity measured by the humidity measurement unit is stored in the storage unit. Based on the heating data to be performed and the humidity change data stored in the storage unit, a second power value larger than the first power is set , and the heating temperature of the heating unit is set. to increase the heating controller supplies the second power to the heating unit,
A plurality of humidity of the image forming medium before the start time is obtained to obtain the average humidity, and it is determined whether the obtained average humidity is different from the humidity recorded in the humidity data. An image forming apparatus comprising: a correction unit that corrects the humidity data by replacing the humidity recorded in the humidity data with the average humidity . The image forming apparatus according to claim 1, wherein the heating control unit stops power supply to the heating unit when the activation time is reached.

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