JP2003302798A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of appropriately controlling a processing condition in accordance with an image to be formed. <P>SOLUTION: In the image forming apparatus, an image is formed by transferring a toner image formed based on image data to recording paper from an image carrier and separating the recording paper from the image carrier. The apparatus is equipped with an image information amount calculation means 160 for calculating the image information amount of the image data equivalent to one sheet of recording paper, and a control means 101 for controlling a transfer condition and a separation condition according to the image information amount calculated by the calculation means 160. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for transferring a toner image generated on the basis of image data from an image carrier to a recording paper and forming an image by separating the recording paper and the image carrier. More specifically, the present invention relates to an image forming apparatus capable of performing optimum transfer and separation.

[0002]

2. Description of the Related Art An electrostatic latent image is formed on an image bearing member based on image data, the electrostatic latent image is developed with a developer (toner) to form a toner image, and the generated toner image. There is an image forming apparatus that transfers an image from an image carrier to a recording paper, separates the recording paper from the image carrier, and fixes the recording paper on which the toner image is placed by heat and pressure to form an image. ing.

Incidentally, as a conventional technique, a technique of controlling a separation condition of recording paper by using a printing rate is disclosed in Japanese Patent Laid-Open No. 2000-89.
614 and JP-A-2000-181291.

[0004]

According to the above-mentioned prior art, although separation can be controlled, various other process conditions cannot be controlled.

For example, in an image forming apparatus for forming a color image with a plurality of color toners or an image forming apparatus for forming an image on both sides of a recording paper, the process conditions cannot be controlled according to the toner amount. It was in a state where transfer, separation and cleaning were not controlled under appropriate conditions.

Further, in recent years, high-speed output has been required for the image forming apparatus, but in the image forming apparatus using the intermediate transfer member or the transfer roller, the intermediate transfer member is transferred even after the toner image is transferred onto the recording paper. Or residual toner on the transfer roller becomes a problem.
If the next image formation is executed without completely cleaning the residual toner on the transfer roller, the back surface of the recording paper becomes dirty. For this reason, it is necessary to take extra time for cleaning between image formation. This has been one of the causes of impeding the high speed operation of the image forming apparatus.

Further, although the toner image is fixed by heat and pressure, there is a problem in that the state of thermal contraction changes depending on the amount of toner and the recording paper curls. This curl is
Although it occurs due to the amount of toner on the recording paper and the difference between the amounts of toner on both sides in the case of double-sided image formation, a control method for appropriately eliminating it has not been considered.

The present invention has been made in view of the above problems, and an object thereof is to provide an image forming apparatus capable of controlling appropriate process conditions according to an image to be formed.

[0009]

The present invention for solving the above problems is as described below. (1) The invention according to claim 1 is an image forming method in which a toner image generated based on image data is transferred from an image carrier to a recording paper, and an image is formed by separating the recording paper and the image carrier. An image information amount calculation means for calculating an image information amount of image data corresponding to one sheet of recording paper; and an image information amount calculated by the image information amount calculation means,
An image forming apparatus, comprising: a control unit that controls transfer conditions and separation conditions.

According to the present invention, when the toner image generated based on the image data is transferred from the image carrier to the recording paper and the image is formed by separating the recording paper and the image carrier, the recording paper 1 The image information amount of image data corresponding to one sheet is calculated, and the transfer condition and the separation condition are controlled according to this image information amount.

That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the process conditions such as the transfer condition and the separation condition are controlled according to the image information amount, so that the toner image is formed. It is possible to control appropriate process conditions according to the image.

(2) The invention according to claim 2 is an image forming apparatus capable of forming an image on both sides of a recording paper, wherein the control means is a difference between the image information amount on the front side and the image information amount on the back side. The image forming apparatus according to claim 1, wherein the transfer condition and the separation condition are controlled by also referring to.

In the present invention, when the image forming apparatus of the above (1) can form images on both sides of the recording paper, the transfer condition and the difference between the image information amount on the front side and the image information amount on the back side are also referred to. The separation conditions are controlled.

That is, the difference between the toner amounts of the toner images formed on both sides of the recording paper is calculated, and in addition to the control of (1) above, this information is also referred to to determine the process conditions such as transfer conditions and separation conditions. Since the control is performed, it is possible to control the process conditions appropriately according to the images formed on both sides of the recording paper.

(3) The invention according to claim 3 is an image forming apparatus capable of forming a color image by using toner of a plurality of colors, and a toner image is formed by a distribution of image data corresponding to one sheet of recording paper. An overlapping area detecting means for detecting an overlapping area of
3. The control unit controls the transfer condition and the separation condition by also referring to the presence / absence of a toner image overlapping region detected by the overlapping region detecting unit. The image forming apparatus described above.

According to the present invention, as the image forming apparatus of (1) or (2), when color images can be formed by using toners of a plurality of colors, the distribution of image data corresponding to one sheet of recording paper is obtained. The toner image superimposing area is detected by the above, and the transfer condition and the separation condition are controlled by also referring to the presence or absence of the toner image superimposing area.

That is, the overlapping area of the toner images of a plurality of colors formed on the recording paper is calculated, and the above (1) and (2) are calculated.
In addition to the above control, since the process conditions such as the transfer condition and the separation condition are controlled with reference to this information as well, it is possible to control the process conditions suitable for the image using the toners of a plurality of colors.

(4) According to the invention described in claim 4, the toner image generated based on the image data is transferred from the image carrier to the recording paper by sandwiching the recording paper with the image carrier and the transfer roller. An image forming apparatus for forming an image,
Image information amount calculation means for calculating the image information amount of image data corresponding to one sheet of recording paper, and cleaning means for cleaning the toner remaining on the transfer roller by applying a predetermined voltage to the transfer roller. An image forming apparatus comprising: a control unit that controls a cleaning condition in accordance with the image information amount calculated by the image information amount calculation unit.

According to the present invention, the toner image generated on the basis of the image data is transferred from the image carrier to the recording paper by sandwiching the recording paper with the image carrier and the transfer roller. When the toner remaining on the transfer roller is cleaned by applying a predetermined voltage to the roller, the image information amount of the image data corresponding to one sheet of recording paper is calculated, and the cleaning condition is determined according to the image information amount. Are trying to control.

That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the cleaning condition of the transfer roller is controlled in accordance with this image information amount, so that the image is formed according to the image to be formed. Appropriate control becomes possible.

(5) In the invention described in claim 5, a color image can be formed by using toners of a plurality of colors, and the toner image from the image carrier of each color is primarily transferred to an intermediate transfer member and the intermediate image is transferred. An image forming apparatus which forms an image by superimposing on a transfer body, and by sandwiching the recording paper between the intermediate transfer body and a transfer roller to perform secondary transfer from the intermediate transfer body to the recording paper, the control means. 5. The image forming apparatus according to claim 4, wherein the control unit controls the cleaning condition of the transfer roller by the cleaning unit according to the image information amount calculated by the image information amount calculating unit.

In the present invention, it is possible to form a color image by using toners of a plurality of colors, and the toner images from the image carriers of the respective colors are primarily transferred to the intermediate transfer body and superposed on the intermediate transfer body. An apparatus for forming an image by sandwiching a recording paper between the intermediate transfer body and a transfer roller to perform secondary transfer from the intermediate transfer body to the recording paper. The transfer roller is formed by applying a predetermined voltage to the transfer roller. When cleaning the toner remaining on the upper side, the image information amount of the image data corresponding to one sheet of recording paper is calculated, and the cleaning condition is controlled according to this image information amount.

That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the cleaning condition of the transfer roller secondarily transferred from the intermediate transfer member is controlled according to the image information amount. Therefore, appropriate control can be performed according to the color image to be formed.

(6) According to a sixth aspect of the invention, an image information amount calculating means for calculating the image information amount of the image data corresponding to one sheet of recording paper, and a toner image generated based on the image data are carried on the image. Transfer means for transferring the transfer paper from the body to the recording paper, separating means for separating the transfer paper and the image carrier, fixing means for fixing the toner image on the recording paper by heat and pressure, and the fixing means. Decal means for correcting the curl generated on the recording paper by heat and pressure by heat and pressure, and control means for controlling the correction amount of the decurling means according to the image information amount calculated by the image information amount calculation means. And an image forming apparatus including:

According to the present invention, when the curl generated on the recording paper by fixing the toner image on the recording paper with the heat and the pressure is corrected by the heat and the pressure, the image data corresponding to one recording paper is recorded. The amount of image information is calculated, and the amount of decal correction is controlled according to the amount of image information.

That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the decal correction amount is controlled according to the image information amount.
It is possible to properly correct the curl that occurs depending on the image to be formed.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram of an electrical main part of an image forming apparatus 100 according to an embodiment of the present invention.

In FIG. 1, reference numeral 101 is an overall control unit for controlling each unit of the image forming apparatus 100. An image processing unit 110 receives image data from an external device or a scanner (not shown) and performs necessary image processing. An engine control unit 120 controls an image forming process of the print engine, which will be described later.

A print engine 130 executes image formation, and executes image formation under the process control from the engine control unit 120 described above. The print engine 130 forms an image by transferring a toner image generated based on image data from the image carrier to the recording paper by sandwiching the recording paper with the image carrier and the transfer roller. .

Reference numeral 140 denotes an operation display unit for displaying the state of the apparatus as the user operates it. Reference numeral 150 denotes a temperature / humidity sensor that detects the temperature and humidity in the vicinity of the print engine 130, and 160 denotes a print rate calculation unit that detects the image information amount in the print engine 130 as a print rate. A table 170 stores data for process control of the print engine 130.

FIG. 2 is a block diagram showing the mechanical structure of the print engine 130 of the image forming apparatus of this embodiment. In FIG. 2, it is possible to form a color image by using toners of a plurality of colors. The toner images from the image carriers of the respective colors are primarily transferred to the intermediate transfer member and superposed on the intermediate transfer member. A specific example is an image forming apparatus that forms an image by sandwiching a recording sheet with an intermediate transfer body and a transfer roller to perform secondary transfer from the intermediate transfer body to the recording sheet.

Here, 11Y to 11K are respectively Y
(Yellow), M (magenta), C (cyan), K
The photosensitive drum is an image bearing member on which toner images of respective colors (black) are formed. Reference numerals 12Y to 12K are band electrodes for charging necessary for forming electrostatic latent images on the surfaces of the photoconductor drums 11Y to 11K, respectively. 13Y-13
K is a surface potential sensor that measures the charging potential of the surface of each of the photoconductor drums 11Y to 11K. 14Y-1
4K is a writing unit for forming an electrostatic latent image by scanning a laser beam on the surface of each of the photoconductor drums 11Y to 11K in accordance with image information of each color.

Denoted at 15Y to 15K are developing devices for developing electrostatic latent images of respective colors formed on the surfaces of the photoconductor drums 11Y to 11K with a developer (toner) to form toner images. Reference numerals 16Y to 16K denote drum cleaning units that remove the toner that has remained without being transferred from the toner images formed on the surfaces of the photoconductor drums 11Y to 11K, respectively. Reference numeral 17 designates the photosensitive drums 11Y to 1 for the respective colors.
It is an intermediate transfer belt on which a toner image from 1K is transferred (primary transfer) and superposed. Reference numeral 18 denotes a secondary transfer roller for transferring (secondarily transferring) the toner image on the intermediate transfer belt 17 to the recording paper and separating the recording paper from the intermediate transfer belt 17. A toner adhesion amount sensor 19 measures the toner adhesion amount on the intermediate transfer belt 17. Reference numeral 20 denotes a belt cleaning unit for removing the residual toner on the intermediate transfer belt 17 after the secondary transfer. A fixing unit 21 fixes the toner image on the recording paper by heat and pressure.

The operation of the image forming apparatus of the present embodiment will be described below with reference to the flowchart of FIG. 3 and the explanatory diagrams of FIG. 4 and subsequent figures. FIG. 3 is a flow chart of control of transfer / separation, which is a characteristic part of this embodiment.

When executing image formation, the overall control unit 10
The print engine 13 has a temperature / humidity sensor 150.
The humidity within 0 is detected (S1 in FIG. 3). If this humidity is low, the humidity (low) area of the table 170 is selected (S2 in FIG. 3). If the humidity is high, the humidity (high) area of the table 170 is selected (S3 in FIG. 3).

Then, the overall control unit 101 detects the paper size of the recording paper used for image formation (S4 in FIG. 3). If the paper size is small, the paper size of the table 170 (small)
Area is selected (S5 in FIG. 3). If the paper size is large, the paper size (large) area of the table 170 is selected (S6 in FIG. 3).

Then, the overall control section 101 detects the sheet passing surface of the recording sheet used for image formation (S7 in FIG. 3). If the sheet passing surface is the front, the sheet passing surface (front) area of the table 170 is selected (S8 in FIG. 3). If the paper passing side is the back side, the area of the paper passing side (back side) of the table 170 is selected (FIG. 3S).
9).

Further, the overall control unit 101 detects the presence / absence of linear velocity correction for image formation (S10 in FIG. 3). Here, the linear velocity is a velocity in the sub-scanning direction during image formation, and linear velocity correction may occur in the case of enlargement / reduction. If there is a linear velocity correction, the linear velocity correction coefficient in the table 170 is determined (S11 in FIG. 3).

Then, the overall control unit 101 detects the printing rate used for image formation (S12 in FIG. 3). If the print ratio is medium, the print ratio (medium) area of the table 170 is selected (S13 in FIG. 3). If the printing rate is small, the area of the printing rate (small) of the table 170 is selected (FIG. 3 S1).
4). If the print rate is high, the print rate (high) area of the table 170 is selected (S15 in FIG. 3). It should be noted that here, the printing rate does not only mean the number of characters included in the image,
The amount of image information is preferably the number of dots formed by toner so that it can be applied to photographic images and the like. That is, this printing rate (image information amount) corresponds to the toner adhesion amount on the recording paper.

By selecting the area of the table 170 as described above, the overall control unit 101 determines the transfer / separation current (FIG. 3 S16), and controls the transfer current / separation current according to the determined current value. To do. That is, the overall control unit 101 reads the value of the corresponding transfer / separation current from the table 170 and transmits it to the engine control unit 120. Then, the engine control unit 120 controls the transfer / separation current.

FIG. 4 is an example of the transfer / separation current table stored in the table 170. As shown in FIG. 4, recording paper size (small / large), humidity (low / large)
High), printing rate data (if the recording paper size is small,
(Small: ~ 3M dots) / (Medium: 3M dots ~ 17M dots) / (Large: 17M dots ~) If the recording paper size is large, (Small: ~ 6M dots) / (Medium: 6M dots ~ 34M dots)
Dot) / (Large: 34M dots ~)), recording paper (front /
The transfer / separation current (μA) is determined according to conditions such as the back side. In addition, this FIG.
This is an example value in the case of dots / 25.4 mm.

Although the coefficient of linear velocity correction is not shown in FIG. 4, the coefficient in the above table may be multiplied by the coefficient according to the linear velocity. For example, the following correction may be performed on the current value selected in FIG. Multiply the correction coefficient (the same value as the linear velocity ratio) by the process linear velocity (1/1, 1/2, 1/3) during image formation. Here, the transfer current is a correction coefficient having the same value as the linear velocity ratio. With separated current, 1/1 speed: × 1.0,
1/2 speed: × 0.9, 1/3 speed: × 0.8.

FIG. 5 is a block diagram showing an example of the arrangement of image information calculation means for obtaining the print ratio as the above image information amount in the print engine 130. According to the time chart shown in FIG. 6, the image information calculating means (printing rate counter) in FIG. 5 has the printing rate counter EN signal (FIG. 6) in the image writing area EN signal (FIG. 6A).
A clock (FIG. 6D) is triggered by a one-shot pulse (FIG. 6C) generated with reference to FIG.
By integrating and counting, the integrated data (FIG. 6E) as image information is output.

Although not shown, the image data expanded in the image memory in the image processing unit 110 is used to
It is also possible to obtain the amount of image information as a software process.

By controlling as described above, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the process conditions such as the transfer condition and the separation condition are controlled according to the image information amount. Therefore, it is possible to appropriately control the process conditions according to the image to be formed.

As a result of experiments conducted by the inventor, good results were obtained by increasing the transfer / separation current as the amount of image information increased. Similarly, good results were obtained by decreasing the transfer / separation current as the amount of image information decreased.

Further, a table for only the transfer / separation current may be independently provided. Further, a table structure such as a normal table for a normal range and a correction table when correction is necessary may be adopted.

When images can be formed on both sides of the recording paper, the transfer conditions are not only controlled by the front and back sides but also refer to the difference between the image information amount on the front side and the image information amount on the back side. And it is desirable to control the separation conditions. For example, the transfer / separation current can be changed between the back surface when a large amount of toner is placed on the front surface and the back surface when a small amount of toner is placed on the front surface. By such control, it becomes possible to control more appropriate process conditions according to the images formed on both sides of the recording paper.

In addition to the above control, when a color image can be formed using a plurality of color toners, the toner image superposition region is detected from the distribution of the image data corresponding to one sheet of recording paper, It is also desirable to control the transfer condition and the separation condition by also referring to the presence / absence of the toner image overlapping region. In addition,
Here, an example of one color and two colors is shown, but if there is a superposition of three colors or four colors, control may be performed accordingly.

For example, as shown in FIG.
The image processing unit 110 detects that the toner image is formed and that the M toner image is present in the central portion in an overlapping manner.
If found out, the overall control unit 101 controls the transfer / separation current as shown in FIG. That is, the overlapping area of the toner images of a plurality of colors formed on the recording paper is calculated, and in addition to the above control, the superimposing information is also referred to control the process conditions such as the transfer condition and the separation condition.
It becomes possible to control appropriate process conditions according to the image using the toners of a plurality of colors.

In the image forming apparatus of this embodiment, the toner image generated based on the image data is transferred to the intermediate transfer belt 17 and the secondary transfer roller 18 so as to sandwich the recording paper. Transferring from the body belt 17 to the recording paper. In this case, by applying a predetermined voltage / current to the secondary transfer roller 18 at predetermined intervals, it is possible to clean the toner remaining on the secondary transfer roller 18.

The cleaning of the secondary transfer roller 18 will be described with reference to the flowchart of FIG. That is, after the secondary transfer is completed on the recording paper, the secondary transfer roller cleaning sequence shown in FIG. 8 is started.

Here, it is checked whether or not the intermediate transfer belt 17 is rotating (FIG. 8S1), and if it is not rotating, the rotation of the intermediate transfer belt 17 is started (FIG. 8).
S2).

Further, it is checked whether or not the secondary transfer roller 18 is in pressure contact with the intermediate transfer belt 17 (see FIG. 8S).
3) If not pressure-bonded, the secondary transfer roller 18 is pressure-bonded to the intermediate transfer belt 17 (FIG. 8S4).

Then, according to the print ratio (image information amount) of the image on which the image formation is completed, the overall control unit 101 determines the voltage, current, and switching time required for cleaning from the table 170, an example of which is shown in FIG. Read and decide (Fig. 8S
5), the secondary transfer roller 18 is cleaned (S6 in FIG. 8).

As shown in FIG. 10, the secondary transfer roller 18 has an outer sponge roller 18a and an inner core metal 1a.
8b, and a voltage is applied to the cored bar 18b. At the time of transfer in normal image formation, the transfer current shown in FIG. 4 is passed in the state of FIG. Then, when performing the cleaning, as shown in FIG.
The normal bias state of (a) and the reverse bias state of FIG. 10 (b) based on the table of FIG. 9 are controlled so as to be alternately repeated. Since the voltage changes depending on the current value, there is no voltage control condition. In addition, the positive / negative switching time is set to 440 milliseconds, and the positive / negative switching is counted once.

As described above, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the cleaning condition of the transfer roller is controlled according to the image information amount, so that the toner image is formed. Appropriate control is possible depending on the image.

As a result, when the amount of used toner is small, it is considered that the amount of residual toner is also small, so that the cleaning time can be shortened and the speed of image formation can be increased.
Further, when a large amount of toner is used, it is considered that a large amount of residual toner is also present. In such a case, the cleaning time can be lengthened and insufficient cleaning can be avoided. Image stains can be prevented. Therefore, it becomes possible to perform optimum cleaning.

Even if the photosensitive drum and the fixing roller are in contact with each other without using the intermediate transfer belt 17, if the same electrical cleaning is performed, the above-described steps are performed. It becomes possible to apply the form example of.

FIG. 11 is a schematic diagram showing a decurling means for correcting the curl generated on the recording paper by fixing the toner image on the recording paper with heat and pressure by the fixing device. As this decurling means, three pairs of two roller pairs for sandwiching the recording paper are provided, and correction is performed by moving the pair of rollers at the center in a direction perpendicular to the conveying direction, and there is no curl. The recording paper in the state is output.

The recording paper may curl as shown in FIG. 11 or due to the difference between the front and back of the image information amount obtained as described above. Therefore, the curl is corrected by obtaining the image information amount in the same manner as in the above-described embodiment and moving the roller pair at the center of the decurling means up and down (or) under the control of the overall control unit 101 or the engine control unit 120. To do.

For example, when the recording paper is cooled, the amount of contraction on the surface having a large amount of toner tends to increase. Therefore, when the curl of FIG. 11 is expected by receiving the information of the image information amount indicating the toner adhesion amount, the control shown in FIG. 11 is performed, and when the curl of FIG. Control such as 11 is performed. It is also desirable to control the decurling correction amount by predicting the curl amount from the image information amount.

Although the color image forming apparatus is used in the specific example of FIG. 2 described above, even in the case of a monochrome image forming apparatus, the contents of each of the above embodiments are applied to obtain a good result. It is possible to obtain.

[0064]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the invention, the toner image generated based on the image data is transferred from the image carrier to the recording paper, and when the image is formed by separating the recording paper and the image carrier, the recording paper is used. The image information amount of image data corresponding to one sheet is calculated, and the transfer condition and the separation condition are controlled according to the image information amount. That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the process conditions such as the transfer condition and the separation condition are controlled according to the image information amount, so that it is possible to change the process condition according to the image to be formed. Therefore, it becomes possible to control appropriate process conditions.

According to the second aspect of the invention, when the image forming apparatus can form images on both sides of the recording paper, the transfer condition is also referred to by referring to the difference between the image information amount on the front side and the image information amount on the back side. And controlling the separation conditions. That is, the difference between the toner amounts of the toner images formed on both sides of the recording paper is calculated, and in addition to the above control, by referring to this information as well, the process conditions such as the transfer condition and the separation condition are controlled, and It is possible to control appropriate process conditions according to the images formed on both sides of the paper.

According to the third aspect of the present invention, as the image forming apparatus described above or in the case where a color image can be formed by using toners of a plurality of colors, the toner is distributed by the image data distribution corresponding to one sheet of recording paper. Detect the overlapping area of the image,
The transfer condition and the separation condition are controlled by also referring to the presence / absence of the toner image overlapping region. That is, the overlapping area of the toner images of a plurality of colors formed on the recording paper is calculated, and in addition to the above-mentioned control, the process conditions such as the transfer condition and the separation condition are controlled with reference to this information. It becomes possible to control appropriate process conditions according to the image using the toners of a plurality of colors.

According to the fourth aspect of the present invention, an image is formed by transferring the toner image generated based on the image data from the image carrier to the recording paper by sandwiching the recording paper with the image carrier and the transfer roller. When cleaning the toner remaining on the transfer roller by applying a predetermined voltage to the transfer roller in the apparatus, the image information amount of the image data corresponding to one sheet of recording paper is calculated, and the image information amount is calculated. The cleaning conditions are controlled according to. That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the cleaning condition of the transfer roller is controlled according to this image information amount, so that it is appropriate for the image to be formed. Control becomes possible.

In the fifth aspect of the invention, it is possible to form a color image by using toners of a plurality of colors, and the toner images from the image carriers of the respective colors are primarily transferred to the intermediate transfer member, and the toner image is transferred onto the intermediate transfer member. A device for forming an image by secondary transfer from the intermediate transfer body to the recording paper by sandwiching the recording paper between the intermediate transfer body and the transfer roller, and applying a predetermined voltage to the transfer roller. When cleaning the toner remaining on the transfer roller, the image information amount of the image data corresponding to one recording sheet is calculated, and the cleaning condition is controlled according to the image information amount. That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the cleaning condition of the transfer roller secondarily transferred from the intermediate transfer member is controlled according to the image information amount. Therefore, appropriate control can be performed according to the color image to be formed.

According to the sixth aspect of the invention, when the curl generated on the recording paper by fixing the toner image on the recording paper by the heat and the pressure is corrected by the heat and the pressure, it corresponds to one recording paper. Calculate the image information amount of the image data to
The decal correction amount is controlled according to the image information amount.
That is, the toner amount of the toner image formed on the recording paper is calculated as the image information amount, and the decal correction amount is controlled according to this image information amount, so that the curl generated according to the image to be formed is controlled. Can be properly corrected.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an electrical configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a mechanical configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 3 is a flowchart showing an operation state of the image forming apparatus according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state of a table used in the image forming apparatus according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of a printing rate counter (image information calculation means) used in the image forming apparatus according to the embodiment of the present invention.

FIG. 6 is a time chart showing the operation of a print rate counter (image information calculation means) used in the image forming apparatus according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an example of an overlapping state of toner images and an example of control in the image forming apparatus according to the embodiment of the present invention.

FIG. 8 is a flowchart showing an operation state of the image forming apparatus according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a state of a table used in the image forming apparatus according to the embodiment of the present invention.

FIG. 10 is a configuration diagram showing a mechanical configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 11 is a configuration diagram showing a mechanical configuration of an image forming apparatus according to an embodiment of the present invention.

[Explanation of symbols]

100 image forming apparatus 101 Overall control unit 110 Image processing unit 120 Engine control unit 130 print engine 140 Operation display section 150 temperature and humidity sensor 160 Print ratio calculator 170 tables

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03G 15/16 G03G 15/16 3F053 103 103 15/20 102 15/20 102 (72) Inventor Shigetaka Kurosu Tokyo 2970 Ishikawa-cho, Miyako Hachioji City Konica Stock Company F-term (reference) 2H027 DC01 DE07 EA03 EA18 EC06 EC20 ED24 FA13 2H028 BA09 BB00 2H033 AA15 AA46 BA10 CA35 2H200 FA01 FA18 GA03 GA04 GA12 GA23 GA34 GA47 GB12 GB25 HA12 HB HBA JC04 JC12 JC18 JC19 KA06 KA29 LB12 LB13 LB39 PA04 PA06 PB16 PB29 2H300 EA10 EB04 EB07 EB12 EC02 EC05 EC16 ED07 ED11 EF03 EF08 EF17 GG07 GG07 GG07 GG07 GG07 GG03 GG03 EG03 EK04 EG03 EG03 EK04 EG03 EK03 EK04 RR10 RR15 RR20 RR22 RR29 RR30 SS01 SS08 3F053 AA06 HA01 HB01 HB24 LA02 LB03

Claims (6)

[Claims] 1. An image forming apparatus for forming a image by transferring a toner image generated based on image data from an image carrier to a recording sheet, and separating the recording sheet and the image carrier from each other. Image information amount calculation means for calculating the image information amount of image data corresponding to one sheet of paper; control means for controlling transfer conditions and separation conditions according to the image information amount calculated by the image information amount calculation means; An image forming apparatus comprising: 2. An image forming apparatus capable of forming an image on both sides of a recording sheet, wherein the control means also refers to a difference between the image information amount on the front surface and the image information amount on the back surface to transfer conditions and separation conditions. To control the
The image forming apparatus according to claim 1, wherein: 3. An image forming apparatus capable of forming a color image by using toners of a plurality of colors, wherein an overlapping area detection is performed to detect an overlapping area of a toner image based on a distribution of image data corresponding to one sheet of recording paper. The means and the control means control the transfer condition and the separation condition by also referring to the presence / absence of the overlapping area of the toner image detected by the overlapping area detecting means. The image forming apparatus according to any one of claims. 4. An image forming apparatus for forming an image by transferring a toner image generated on the basis of image data to a recording sheet by sandwiching the recording sheet between the image bearing member and a transfer roller. An image information amount calculation means for calculating an image information amount of image data corresponding to one sheet of recording paper; and a cleaning means for cleaning the toner remaining on the transfer roller by applying a predetermined voltage to the transfer roller. An image forming apparatus comprising: a control unit configured to control a cleaning condition in accordance with the image information amount calculated by the image information amount calculation unit. 5. A color image can be formed by using toners of a plurality of colors, and the toner images from the image bearing members of the respective colors are primarily transferred to an intermediate transfer member and superposed on the intermediate transfer member. An image forming apparatus that forms an image by secondary transfer from an intermediate transfer body to a recording sheet by sandwiching the recording sheet between a transfer body and a transfer roller, wherein the control unit is the image information amount calculation unit. The image forming apparatus according to claim 4, wherein a condition for cleaning the transfer roller by the cleaning unit is controlled according to the calculated image information amount. 6. An image information amount calculating means for calculating an image information amount of image data corresponding to one sheet of recording paper, and a transfer means for transferring a toner image generated based on the image data from the image carrier to the recording paper. Separating means for separating the transfer paper and the image carrier, fixing means for fixing the toner image on the recording paper by heat and pressure, and heat and pressure on the recording paper on the recording paper. Decurling means for correcting the generated curl by heat and pressure; and control means for controlling the correction amount of the decurling means according to the image information amount calculated by the image information amount calculating means,
An image forming apparatus comprising: