JP2013186354A - Surface treatment device, image forming apparatus, and image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface treatment device capable of suppressing glossiness unevenness resulting from a temperature difference in fixing processing to provide excellent finish, an image forming apparatus, and an image forming method.SOLUTION: A temperature detection unit 80 is installed in the vicinity of a fixing belt 413c to detect a temperature of the fixing belt 413c. A surface treatment unit 60 performs a surface treatment on a sheet fixed by a fixing unit 413 by selectably heating an area to be heated of the sheet. A control unit 10 causes the surface treatment unit 60 to heat an area of the sheet corresponding to a position of the fixing belt 413c of which temperature is detected according to the temperature of the fixing belt 413c detected by the temperature detection unit 80.

Description

  The present invention relates to a surface treatment apparatus, an image forming apparatus, and an image forming method.

  Conventionally, a toner image is formed on an image carrier such as a photosensitive drum using an electrophotographic process such as charging, exposure, and development, and after the toner image is formed on a sheet, the toner image is fixed on the sheet by a fixing device. An image forming apparatus is known.

  Among such image forming apparatuses, there is an image forming apparatus provided with a thermal head for imparting gloss by selectively heating an image forming portion of a sheet after fixing (for example, Patent Document 1).

JP 2011-99913 A

  By the way, a conventional fixing device of an image forming apparatus has a roller member or a plurality of rotating members on a heating member such as a heating roller having a heater inside a rotating member or a heating belt wound around an appropriate heating device. A belt-like pressure member wound around a roller is placed opposite to each other, a sheet carrying a toner image is sandwiched between these two members, and the paper is conveyed while being pressurized and heated to perform a fixing process. Things are common.

  However, in the image forming apparatus described in Patent Document 1, when the fixing process is performed by the fixing device, the heat applied to the heating member is lost due to the contact of the paper, and the heating member may cause a temperature step depending on the region. is there. Therefore, when the fixing process is performed on the paper in such a state, a gloss level difference (gloss unevenness) appears in each region depending on the temperature level difference. However, it is finished with such a gloss step.

  An object of the present invention is to provide a surface processing apparatus, an image forming apparatus, and an image forming method capable of suppressing a gloss level difference caused by a temperature level difference in a fixing process and improving the finish.

In order to solve the above problems, the invention according to claim 1 is a surface treatment apparatus,
A temperature at which the temperature of the heating member is detected in the vicinity of the heating member of the fixing device that fixes the toner image to the paper by heating and pressing the paper on which the toner image is formed by the heating member and the pressure member. A detection unit;
A surface treatment unit for performing surface treatment of the paper by selectively heating an area to be heated to the paper fixed by the fixing device;
A control unit that controls the surface treatment unit to heat the area of the paper corresponding to the position of the heating member that has detected the temperature, in accordance with the temperature of the heating member detected by the temperature detection unit;
It is provided with.

The invention according to claim 2 is the surface treatment apparatus according to claim 1,
The control unit causes the surface treatment unit to heat the sheet with an amount of heat corresponding to the temperature of the heating member detected by the temperature detection unit.

The invention according to claim 3 is the surface treatment apparatus according to claim 2,
The control unit calculates a decrease in the temperature of the heating member from the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated decrease in temperature. Is heated.

The invention according to claim 4 is the surface treatment apparatus according to claim 2,
The control unit calculates a difference between a predetermined target temperature and the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated temperature difference. Is heated.

The invention according to claim 5 is an image forming apparatus,
An image forming unit for forming a toner image on paper;
A fixing unit that fixes the toner image on the paper by heating and pressing the paper on which the toner image is formed by the image forming unit with a heating member and a pressure member;
A temperature detector provided in the vicinity of the heating member to detect the temperature of the heating member;
A surface treatment unit for selectively heating a region to be heated with respect to the paper fixed by the fixing unit and performing surface treatment of the paper;
A control unit configured to control the surface treatment unit to heat the area of the paper corresponding to the position of the heating member that has detected the temperature, in accordance with the temperature of the heating member detected by the temperature detection unit;
It is provided with.

According to a sixth aspect of the present invention, in the image forming apparatus according to the fifth aspect,
The control unit causes the surface treatment unit to heat the sheet with an amount of heat corresponding to the temperature of the heating member detected by the temperature detection unit.

According to a seventh aspect of the present invention, in the image forming apparatus according to the sixth aspect,
The control unit calculates a decrease in the temperature of the heating member from the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated decrease in temperature. Is heated.

The invention according to claim 8 is the image forming apparatus according to claim 6,
The control unit calculates a difference between a predetermined target temperature and the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated temperature difference. Is heated.

The invention according to claim 9 is an image forming method,
An image forming step of forming a toner image on paper;
A fixing step of fixing the toner image on the paper by heating and pressurizing the paper on which the toner image is formed in the image forming step with a heating member and a pressure member of a fixing device;
A temperature detection step of detecting the temperature of the heating member;
A surface treatment step of selectively heating a region to be heated with respect to the paper fixed in the fixing step to perform surface treatment of the paper;
Including
In the surface treatment step, the region of the paper corresponding to the position of the heating member that detected the temperature is heated according to the temperature of the heating member detected in the temperature detection step.

According to a tenth aspect of the present invention, in the image forming method according to the ninth aspect,
In the surface treatment step, the sheet is heated with an amount of heat corresponding to the temperature of the heating member detected in the temperature detection step.

According to an eleventh aspect of the present invention, in the image forming method according to the tenth aspect,
In the surface treatment step, a decrease in the temperature of the heating member is calculated from the temperature of the heating member detected in the temperature detection step, and the cow is heated with a heat amount corresponding to the calculated decrease in temperature. It is characterized by that.

The invention according to claim 12 is the image forming method according to claim 10,
In the surface treatment step, a difference between a predetermined target temperature and the temperature of the heating member detected in the temperature detection step is calculated, and the paper is heated with a heat amount corresponding to the calculated temperature difference. It is characterized by.

  According to the present invention, it is possible to suppress gloss unevenness caused by a temperature step in the fixing process and improve the finish.

1 is a diagram illustrating an internal configuration of an image forming apparatus. It is a top view which shows schematic structure of a surface treatment part. It is a figure explaining the relationship between the electric current amount and the calorie | heat amount administered to a paper. 2 is a block diagram illustrating a functional configuration of the image forming apparatus. FIG. It is a figure explaining the relationship between the detection temperature by a temperature detection part, and the quantity of the electric current added to a heat generating body. It is a timing chart explaining the relationship between the temperature detected by the temperature detector and the amount of current applied to the heating element. It is a figure explaining the relationship between the detection temperature by a temperature detection part, and the quantity of the electric current added to a heat generating body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The scope of the invention is not limited to the illustrated example.

  For example, as shown in FIG. 1, the image forming apparatus 1 includes an image reading unit 30, an image forming unit 40, a paper feeding unit 50, a surface processing unit 60, and a temperature detection unit 80.

  The image reading unit 30 includes an automatic document feeder (ADF), a platen glass, a CCD (Charge Coupled Device), and a light source. Then, the image reading unit 30 forms an image of the reflected light of the illumination scanned on the document supplied from the light source by the ADF or the document set at a predetermined position by the CCD and photoelectrically converts the reflected light. The image is read as R, G, and B signals, and the read analog image signal is converted into R, G, and B image data and output.

  The output image data undergoes predetermined image processing, is converted into YMCK data, and is sent to the image forming unit 40.

  The image forming unit 40 includes a plurality of sets of image forming units 40Y, 40M, 40C, and 40K, an endless intermediate transfer belt 407, a transport unit 420 that transports the fed paper, and toner transferred to the paper. And a fixing unit 413 for fixing the image.

  The image forming unit 40Y for forming a yellow (Y) image includes a photosensitive drum 401Y as an image carrier, a developing unit 402Y, a charger 403Y disposed around the photosensitive drum 401Y, and a laser unit 404Y. And a cleaner 405Y and a primary transfer roller 406Y.

  Similarly, the image forming unit 40M that forms a magenta (M) color image includes a photosensitive drum 401M, a developing device 402M, a charger 403M, a laser unit 404M, a cleaner 405M, and a primary transfer roller 406M. I have.

  Similarly, the image forming unit 40C for forming a cyan (C) color image includes a photosensitive drum 401C, a developing unit 402C, a charger 403C, a laser unit 404C, a cleaner 405C, and a primary transfer roller 406C. I have.

  Similarly, the image forming unit 40K that forms a black (K) image includes a photosensitive drum 401K, a developing unit 402K, a charging unit 403K, a laser unit 404K, a cleaner 405K, and a primary transfer roller 406K. I have.

  Here, an image forming operation in the image forming unit 40 will be described. First, in the image forming unit 40Y, the photosensitive drum 401Y rotates, the surface thereof is charged by the charger 403Y, and the latent image of the Y data image is formed on the charged portion by the exposure of the laser light source output from the laser unit 404Y. It is formed. The latent image portion is developed by the developing device 402Y to form a yellow toner image. The toner image is primarily transferred to the intermediate transfer belt 407 by the pressure contact of the primary transfer roller 406Y. The toner image is a yellow image corresponding to the image data to be output. The toner that has not been primarily transferred is removed by the cleaner 405Y.

  Similarly, in the image forming units 40M, 40C, and 40K, magenta toner images, cyan toner images, and black toner images are formed and transferred, respectively. The image forming unit 40 further includes a roller 408 and a secondary transfer roller 410. The intermediate transfer belt is rotated by the rotation of the roller 408 and the secondary transfer roller 410 and the primary transfer rollers 406Y, 406M, 406C, and 406K. 407 is circulated. Then, the intermediate transfer belt 407 is rotated so that the YMCK toner images are sequentially superimposed on the intermediate transfer belt 407 and transferred.

The paper feed unit 50 includes paper feed trays 500A, 500B, and 500C, and paper feed rollers 501A, 501B, and 501C for transporting paper set in the paper feed trays 500A to 500C to the transport unit 420.
When the image forming unit 40 forms an image on a sheet, the sheet is conveyed one by one from any of the sheet feeding trays 500A to 500C by rotation of any of the sheet feeding rollers 501A to 501C. It is conveyed to the secondary transfer roller 410 by the rotation of the registration roller 409.

  When the sheet passes through the pressure contact portion of the secondary transfer roller 410, the YMCK toner image on the intermediate transfer belt 407 is secondarily transferred to the sheet. The sheet on which the YMCK toner image is transferred passes through the fixing unit 413.

  The fixing unit 413 includes a heating roller 413a, a fixing roller 413b, a fixing belt 413c, and a pressure roller 413d. The fixing belt 413c is stretched by a heating roller 413a and a fixing roller 413b. The heating roller 413a includes a high-power heater therein, rotates in the forward direction with respect to the paper transport direction, and heats the fixing roller 413b via the fixing belt 413c. The fixing roller 413b rotates in the forward direction with respect to the transport direction of the paper S, and heats and pressurizes the fixing surface of the transported paper. The pressure roller 413d presses the non-fixing surface of the paper that has been rotated and conveyed in the forward direction with respect to the paper conveyance direction. The fixing unit 413 is configured as described above, and pressurization and heating are performed on the paper, whereby the YMCK toner image is fixed on the paper. The paper on which the toner image is fixed is discharged by a paper discharge roller 417. In the present embodiment, the fixing unit 413 may be referred to as a fixing device.

  When forming an image on both sides, a sheet on which an image is formed on one side (front side) is sent to the duplex conveyance unit 415 by the conveyance path switching plate 414 and the surface is reversed by the duplex conveyance unit 415. Then, the sheet is conveyed to the secondary transfer roller 410 by the registration roller 409 so that the image is formed again on the surface where the image is not formed (back surface), and the image is formed. The paper on which images are formed on both sides and the toner is fixed is conveyed to a paper discharge tray 419 by a paper discharge roller 417. In the present embodiment, a flow path through which a sheet is conveyed by the registration roller 409, the secondary transfer roller 410, the duplex conveyance unit 415, the discharge roller 417, and the like is referred to as a conveyance unit 420.

  In the present exemplary embodiment, a surface processing unit 60 is provided on the downstream side of the fixing unit 413 to heat the surface of the paper that has been pressed and heated by the fixing unit 413 to perform surface processing. The surface treatment unit 60 performs surface treatment by heating the surface of the paper to give gloss to the surface of the paper. As shown in FIG. 2, the surface treatment unit 60 is disposed on the upper surface side of the conveyance unit 420, and a plurality of heating elements 60 a are arranged in a one-dimensional array in a direction (main scanning direction) orthogonal to the conveyance direction of the paper S. Is arranged. The plurality of heating elements 60a may be arranged in a two-dimensional array in the main scanning direction and the sub-scanning direction. The surface treatment unit 60 can selectively give gloss to the entire area of the sheet or an arbitrary partial area by individually controlling the energization of the plurality of heating elements 60a. The heating element 60a generates heat when a current is applied thereto, and the amount of heat applied to the paper can be adjusted by varying the amount of current as shown in FIG.

  After the image formation on the paper, the toner remaining on the intermediate transfer belt 407 is removed by the belt cleaning 412. Further, a positive polarity current and a negative polarity current are alternately switched from a power source (not shown) to the secondary transfer roller 410 and flow for a predetermined time, so that the toner remaining on the secondary transfer roller 410 is transferred to the intermediate transfer belt 407. The transfer is performed again, and the secondary transfer roller 410 is cleaned.

  In the present embodiment, a temperature detection unit 80 that detects the temperature of the outer periphery of the fixing belt 413c of the fixing unit 413 is provided on the outer periphery of the fixing belt 413c and in the vicinity of the center portion in the width direction. The temperature detector 80 may be disposed at any position in the vicinity of the fixing belt 413c. The temperature detection unit 80 includes, for example, a thermistor, and the electric resistance value of the thermistor changes according to the temperature change of the fixing belt 413c. The temperature detection unit 80 detects the temperature of the fixing belt 413 c based on the electrical resistance value of the thermistor, and outputs information indicating the detected temperature to the control unit 10.

  Next, the configuration of the control system of the image forming apparatus 1 will be described. As shown in FIG. 4, the image forming apparatus 1 includes a control unit 10, an HDD (Hard Disk), in addition to the image reading unit 30, the image forming unit 40, the paper feeding unit 50, the surface processing unit 60, and the temperature detection unit 80 described above. Drive) 14, an operation display unit 20, and a communication unit 70.

  The HDD 14 stores various data according to instructions from the control unit 10.

  The operation display unit 20 includes, for example, an LCD (Liquid Crystal Display), a touch panel, a numeric keypad, and the like. The operation display unit 20 configured as described above receives a display signal from the control unit 10 and displays it on the LCD, and outputs an operation signal input from a touch panel or a numeric keypad to the control unit 10.

  The communication unit 70 is an interface that can be connected to a transmission medium connected to a communication network N such as a LAN (Local Area Network) or a WAN (Wide Area Network). The communication unit 70 is configured by a communication control card such as a LAN card, for example, and transmits / receives various data to / from an external device such as a host device connected to the communication network N via a communication line with a LAN cable. .

  The control unit 10 includes a CPU (Central Processing Unit) 11, a RAM (Random Access Memory) 12, a ROM (Read Only Memory) 13, and the like. Various processing programs are stored in the ROM 13, and the CPU 11 reads out various programs stored in the ROM 13, develops them in the RAM 12, and controls the operation of each unit of the image forming apparatus 1 according to the expanded programs.

  For example, when image data is input from the image reading unit 30 or the communication unit 70, the control unit 10 performs various image processing on the input image data and outputs the image data to the image forming unit 40 for each page, thereby forming an image. To do. Examples of the image processing include conversion processing of R, G, B image data input from the image reading unit 30 into Y, M, C, K image data, a host device (not shown) via the communication unit 70, and the like. For example, a process of converting image data input from the image data into Y, M, C, K image data in a data format that can be formed by the image forming apparatus 1 using a predetermined page description language.

  Further, the control unit 10 heats the sheet by adjusting the amount of current applied to the plurality of heating elements 60 a of the surface treatment unit 60 according to the temperature of the outer periphery of the fixing belt 413 c detected by the temperature detection unit 80. Control is performed to adjust the amount of heat applied to the paper during printing.

  Here, a method for adjusting the current amount will be described. For example, the control unit 10 first acquires the temperature of the outer periphery of the fixing belt 413 c at the start of image formation by the temperature detection unit 80, and sets this as the reference temperature P. For example, the control unit 10 generates a table having a relationship as shown in FIG. 5 and performs control so that an amount of current corresponding to the temperature detected by the temperature detection unit 80 is applied to the heating element 60a. That is, the control unit 10 performs control so that an amount of current corresponding to the temperature drop from the reference temperature P is applied to the heating element 60a. Thereafter, the control unit 10 continuously detects the temperature of the outer periphery of the fixing belt 413c by the temperature detection unit 80, and adjusts the amount of current applied to the heating element 60a according to the detection result. The timing at which the amount of current applied to the heating element 60a after the detection by the temperature detection unit 80 is changed to the amount of current corresponding to the detection result is the surface treatment unit 60 after the sheet passes through the fixing unit 413. The time is appropriately set in consideration of the time until it reaches, the response speed of the heating element 60a, and the like.

In the configuration as described above, for example, when the fixing process is performed on a plurality of sheets S whose length in the sub-scanning direction is longer than the period B of the fixing belt 413c, the temperature detection unit 80 The transition of temperature detection as shown in FIG.
Specifically, first, after the fixing process of the first sheet S1 is started by the fixing unit 413, the fixing belt 413c makes one turn (B1) before the fixing process for the first sheet S1 is completed. The fixing process for the first sheet S1 is completed during the second round (B2) of the fixing belt 413c. Therefore, since the fixing belt 413c has a constant temperature (reference temperature P) in the first round (B1), it can apply a constant amount of heat to the first sheet S1, Since the heat amount of the fixing belt 413c is taken away by contact with the first sheet S1, the temperature in the second turn (B2) is lower than that in the first turn. For this reason, the amount of heat applied to the first sheet S1 varies from the middle of the conveyance, and as a result, a step (gloss step) may occur in the gloss.

Further, after the predetermined interval X, when the second sheet S2 is fixed by the fixing unit 413, the second sheet S2 contacts from the middle of the second round (B2) of the fixing belt 413c. It becomes. Therefore, the fixing belt 413c shifts from the second turn (B2) to the third turn (B3) during the fixing process for the second sheet S2. The temperature of the fixing belt 413c in the third round (B3) is further lowered by the contact of the first sheet S1 and the second sheet S2 with the fixing belt 413c. Then, the fixing process for the second sheet S2 is completed in the middle of the third round (B3) of the fixing belt 413c. For this reason, the amount of heat applied to the second sheet S2 differs from the middle of conveyance, and as a result, a gloss level difference may occur. Further, in the third lap of the fixing belt 413c (B3), there is a portion X ₁ where lowering of the temperature is suppressed by the sheet interval X of the first sheet S1 and the second sheet S2. By the partial X ₁ and the second sheet S2, lowering of the temperature is suppressed is in contact at the contact portion of the third lap of the fixing belt 413c and (B3) and the second sheet of sheet S2, 2 Different portions of heat are applied to the second sheet S2. As a result, a further gloss difference may occur.

Further, after the predetermined sheet interval Y, when the third sheet S3 is fixed by the fixing unit 413, the third sheet S3 contacts from the middle of the third round (B3) of the fixing belt 413c. It becomes. Therefore, the fixing belt 413c shifts from the third turn (B3) to the fourth turn (B4) during the fixing process for the third sheet S3. The temperature of the fixing belt 413c in the fourth round (B4) is further lowered by the contact of the first sheet S1, the second sheet S2, and the third sheet S3 with the fixing belt 413c. Then, the fixing process for the third sheet S3 is completed in the fourth turn (B4) of the fixing belt 413c. For this reason, the amount of heat applied to the third sheet S3 differs from the middle of conveyance, and as a result, a gloss step may occur. Further, in the fourth turn (B4) of the fixing belt 413c, the portion X ₂ in which the decrease in temperature is suppressed by the gap X between the first sheet S1 and the second sheet S2, and two sheets it is moiety Y ₁ drop in temperature is suppressed by the sheet interval Y eye sheet S2 and the third sheet S3. The portions X ₂ and Y ₁ in which the temperature decrease is suppressed and the third sheet S 3 come into contact with each other, so that the fourth contact (B 4) of the fixing belt 413 c and the third sheet S 3 are in contact with each other. In this case, different portions of the amount of heat applied to the third sheet S3 are generated. As a result, a further gloss difference may occur.

  Therefore, in the present embodiment, in order to reduce such a gloss level difference, as shown in FIG. 6B, it is applied to the heating element 60a according to the temperature of the fixing belt 413c detected by the temperature detection unit 80. By adjusting the amount of current, the amount of heat applied to each sheet by the surface treatment unit 60 is adjusted. That is, the control unit 10 refers to the table as shown in FIG. 5 described above, and the amount of current applied to the heating element 60a is equal to the temperature detected by the temperature detection unit 80 being reduced from the reference temperature P described above. Control to the corresponding amount.

  In this embodiment, the temperature of the outer periphery of the fixing belt 413c at the start of image formation is set as the reference temperature P, and an amount of current corresponding to the amount decreased from the reference temperature P is applied to the heating element 60a. Although the table is generated, for example, as shown in FIG. 7, a target temperature Q is determined in advance, and an amount of current corresponding to the temperature difference from the target temperature Q is applied to the heating element 60a. Such a table may be held in advance.

  As described above, according to the present embodiment, the image forming unit 40 forms a toner image on a sheet. The fixing unit 413 heats and presses the paper on which the toner image is formed by the image forming unit 40 with a heating member (a heating roller 413a, a fixing roller 413b, a fixing belt 413c) and a pressure roller 413d. To settle. The temperature detector 80 is provided in the vicinity of the fixing belt 413c and detects the temperature of the fixing belt 413c. The surface treatment unit 60 performs surface treatment of the paper by selectively heating an area to be heated for the paper fixed by the fixing unit 413. In accordance with the temperature of the fixing belt 413 c detected by the temperature detection unit 80, the control unit 10 causes the surface processing unit 60 to heat the sheet area corresponding to the position of the fixing belt 413 c that has detected the temperature. As a result, the gloss level difference caused by the temperature level difference in the fixing process can be reduced by heating the sheet in the surface processing unit, so that the finish can be improved. In addition, since there is no need for a heat design or the like in the fixing unit that does not cause a temperature drop even when the heating member makes a plurality of turns on the same surface of the paper, it can be realized with a simple configuration.

  Further, according to the present embodiment, the control unit 10 causes the surface processing unit 60 to heat the sheet with a heat amount corresponding to the temperature of the fixing belt 413 c detected by the temperature detection unit 80. As a result, the amount of heat applied to the paper can be made uniform, and the gloss level difference can be reduced to achieve a better finish.

  Further, according to the present embodiment, the control unit 10 calculates a decrease in the temperature of the fixing belt 413 c from the temperature of the fixing belt 413 c detected by the temperature detection unit 80. The control unit 10 causes the surface treatment unit 60 to heat the sheet with a heat amount corresponding to the calculated temperature decrease. As a result, the amount of heat generated by the surface treatment unit can be reduced, and an increase in cost can be suppressed.

  Further, according to the present embodiment, the control unit 10 calculates a difference between a predetermined target temperature and the temperature of the fixing belt 413 c detected by the temperature detection unit 80. The control unit 10 causes the surface treatment unit 60 to heat the sheet with the amount of heat corresponding to the calculated temperature difference. As a result, the control for heating can be simplified, and the processing efficiency can be improved.

  The description in the embodiment of the present invention is an example of the image forming apparatus according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of each functional unit constituting the image forming apparatus can be appropriately changed.

  In this embodiment, the heating member is configured by the heating roller 413a, the fixing roller 413b, and the fixing belt 41c. However, the heating member is configured by the heating roller, and the heating roller and the pressure roller add to the paper. The structure which implements a pressure and a heating may be sufficient.

  In the present embodiment, the surface treatment unit 60 is controlled so that the amount of heat corresponding to the temperature detected by the temperature detection unit 80 is applied to the paper. In response to the detected temperature being a predetermined temperature, the surface treatment unit 60 may be controlled so that a certain amount of heat is applied to the sheet. Specifically, the surface treatment unit 60 may be configured to administer a predetermined amount of heat to the paper in response to the temperature detected by the temperature detection unit 80 being lower than a predetermined temperature.

  In the present embodiment, the surface treatment unit 60 is controlled by software processing by the control unit 10, but the control may be performed by a hardware configuration such as an ASIC (Application Specific Integrated Circuit). .

  In this embodiment, a color image forming apparatus that forms a toner image on a sheet with four color toner materials of CMYK is applied. However, the present invention is applied to an image forming apparatus that forms a toner image on a sheet with a single color toner material. Also good.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Control part 40 Image forming part 413 Fixing part (fixing apparatus)
413c Fixing belt (heating member)
413d Pressure roller (pressure member)
60 Surface treatment unit 80 Temperature detection unit

Claims (12)

A temperature at which the temperature of the heating member is detected in the vicinity of the heating member of the fixing device that fixes the toner image to the paper by heating and pressing the paper on which the toner image is formed by the heating member and the pressure member. A detection unit;
A surface treatment unit for performing surface treatment of the paper by selectively heating an area to be heated to the paper fixed by the fixing device;
A control unit that controls the surface treatment unit to heat the area of the paper corresponding to the position of the heating member that has detected the temperature, in accordance with the temperature of the heating member detected by the temperature detection unit;
A surface treatment apparatus comprising:   The surface treatment apparatus according to claim 1, wherein the control unit causes the surface treatment unit to heat the sheet with a heat amount corresponding to a temperature of the heating member detected by the temperature detection unit.   The control unit calculates a decrease in the temperature of the heating member from the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated decrease in temperature. The surface treatment apparatus according to claim 2, wherein the surface treatment apparatus is heated.   The control unit calculates a difference between a predetermined target temperature and the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated temperature difference. The surface treatment apparatus according to claim 2, wherein the surface treatment apparatus is heated. An image forming unit for forming a toner image on paper;
A fixing unit that fixes the toner image on the paper by heating and pressing the paper on which the toner image is formed by the image forming unit with a heating member and a pressure member;
A temperature detector provided in the vicinity of the heating member to detect the temperature of the heating member;
A surface treatment unit for selectively heating a region to be heated with respect to the paper fixed by the fixing unit and performing surface treatment of the paper;
A control unit configured to control the surface treatment unit to heat the area of the paper corresponding to the position of the heating member that has detected the temperature, in accordance with the temperature of the heating member detected by the temperature detection unit;
An image forming apparatus comprising:   The image forming apparatus according to claim 5, wherein the control unit causes the surface treatment unit to heat the sheet with a heat amount corresponding to a temperature of the heating member detected by the temperature detection unit.   The control unit calculates a decrease in the temperature of the heating member from the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated decrease in temperature. The image forming apparatus according to claim 6, wherein the image forming apparatus is heated.   The control unit calculates a difference between a predetermined target temperature and the temperature of the heating member detected by the temperature detection unit, and supplies the sheet to the surface treatment unit with a heat amount corresponding to the calculated temperature difference. The image forming apparatus according to claim 6, wherein the image forming apparatus is heated. An image forming step of forming a toner image on paper;
A fixing step of fixing the toner image on the paper by heating and pressurizing the paper on which the toner image is formed in the image forming step with a heating member and a pressure member of a fixing device;
A temperature detection step of detecting the temperature of the heating member;
A surface treatment step of selectively heating a region to be heated with respect to the paper fixed in the fixing step to perform surface treatment of the paper;
Including
In the surface treatment step, according to the temperature of the heating member detected in the temperature detection step, the area of the paper corresponding to the position of the heating member that has detected the temperature is heated. .   The image forming method according to claim 9, wherein in the surface treatment step, the sheet is heated with an amount of heat corresponding to the temperature of the heating member detected in the temperature detection step.   In the surface treatment step, a decrease in the temperature of the heating member is calculated from the temperature of the heating member detected in the temperature detection step, and the cow is heated with a heat amount corresponding to the calculated decrease in temperature. The image forming method according to claim 10.   In the surface treatment step, a difference between a predetermined target temperature and the temperature of the heating member detected in the temperature detection step is calculated, and the paper is heated with a heat amount corresponding to the calculated temperature difference. The image forming method according to claim 10.

Images