JP2015232624A - Image forming apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of suppressing the contamination of the peripheral member of transfer means caused by a non-transfer toner image on an image holder and to provide a program.SOLUTION: The image forming apparatus includes image forming means for forming a toner image by using a developer on the image holder, the transfer means for transferring the toner image formed on the image holder to a recording medium, beltlike toner image forming means for forming a beltlike toner image extending in a direction crossing the movement direction of the image holder in a non-image area located between the adjacent toner images on the image holder, and beltlike toner image formation control means for performing control for formation so that the image width of the beltlike toner image in the direction crossing the movement direction of the image holder is shorter than the recording medium width in the direction crossing the movement direction of the image holder, of the recording medium used for transferring the continuously formed toner image.

Description

  The present invention relates to an image forming apparatus and a program.

  An image carrier on which a latent image is formed, developing means for developing the latent image on the image carrier with negative polarity toner to form a toner image, and an intermediate on which the toner image is transferred by charging the surface to positive polarity In the image forming apparatus having a transfer body, a portion corresponding to the image forming area and a portion corresponding to the non-image forming area of the intermediate transfer body as a sheet passing area and a non-sheet passing area, respectively. When a negative non-transferred toner image that is not transferred as a toner image on the intermediate transfer member is formed in the non-image forming area of the image carrier, the surface potential of at least the portion corresponding to the non-transferred toner image in the non-sheet passing area An image forming apparatus that charges a positive surface potential having a smaller absolute value than a positive polarity surface potential in a paper passing area is known (Patent Document 1).

JP 2001-188420 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus and a program capable of suppressing contamination of peripheral members of a transfer unit due to a non-transferred toner image on an image carrier.

In order to solve the above-mentioned problem, an image forming apparatus according to claim 1,
Image forming means for forming a toner image on the image carrier using a developer;
Transfer means for transferring a toner image formed on the image carrier to a recording medium;
A belt-like toner image forming unit that forms a belt-like toner image extending in a direction intersecting with the moving direction of the image carrier in a non-image area located between adjacent toner images on the image carrier;
A direction in which the image width of the belt-shaped toner image intersects with the moving direction of the image holding member intersects with the moving direction of the image holding member of the recording medium used for the transfer of the toner image to be subsequently formed. A belt-like toner image formation control means for controlling to form the recording medium shorter than the recording medium width,
It is characterized by that.

According to a second aspect of the present invention, in the image forming apparatus according to the first aspect,
The belt-like toner image formation control means increases the image density of the belt-like toner image when the recording medium width is smaller than the maximum width dimension;
It is characterized by that.

According to a third aspect of the present invention, in the image forming apparatus according to the first aspect,
The belt-like toner image formation control means increases the image length of the belt-like toner image in the moving direction of the image carrier when the recording medium width is smaller than the maximum width dimension;
It is characterized by that.

According to a fourth aspect of the present invention, in the image forming apparatus according to the first aspect,
The transfer unit includes an intermediate transfer member disposed to face the image carrier, a primary transfer unit that primarily transfers a toner image on the image carrier to the intermediate transfer member at a primary transfer unit, and the intermediate transfer member. Secondary transfer means for secondary transfer of the toner image transferred to the recording medium at a secondary transfer portion,
The secondary transfer means is in contact with the intermediate transfer body when the belt-like toner image held on the intermediate transfer body passes through the secondary transfer portion.
It is characterized by having.

In order to solve the above problem, the program according to claim 5 is:
On the computer,
An image forming function for forming a toner image on the image carrier using a developer;
A transfer function for transferring a toner image formed on the image carrier to a recording medium;
A belt-like toner image forming function for forming a belt-like toner image extending in a direction intersecting the moving direction of the image carrier in a non-image region located between adjacent toner images on the image carrier;
A direction in which the image width of the belt-shaped toner image intersects with the moving direction of the image holding member intersects with the moving direction of the image holding member of the recording medium used for the transfer of the toner image to be subsequently formed. A belt-like toner image formation control function for controlling to form shorter than the recording medium width,
It is characterized by that.

According to the first and fifth aspects of the present invention, the image width in the direction intersecting the moving direction of the image carrier of the belt-like toner image is set to the image holding of the recording medium used for the transfer of the toner image to be subsequently formed. Suppresses contamination of the peripheral member of the transfer means due to the non-transferred toner image on the image carrier as compared with a configuration in which the recording medium width is not shorter than the recording medium width in the direction intersecting the body movement direction. Can be.
According to the second aspect of the present invention, an increase in the density of the deteriorated toner in the developer can be suppressed.
According to the third aspect of the present invention, an increase in the density of the deteriorated toner in the developer can be suppressed.
According to the fourth aspect of the present invention, it is possible to suppress a reduction in image formation productivity.

2 is a schematic cross-sectional view illustrating an example of a schematic configuration of the image forming apparatus 1. FIG. 2 is a functional block diagram of an image forming unit 10. FIG. 2 is a schematic cross-sectional view illustrating a configuration of a transfer device 15 including a paper transport unit in the image forming apparatus 1. FIG. 3 is a diagram illustrating a configuration around a secondary transfer unit TR of the image forming apparatus 1 and a passage of a toner band TB in the secondary transfer unit TR. FIG. 6 is a schematic plan view showing the relationship between the toner image on the intermediate transfer belt 151 and the width direction of the secondary transfer portion TR when the toner band TB is formed with the maximum image formation width in the inter image portion IM. 4 is a schematic plan view illustrating a relationship between an image width Lb of a toner band TB and a paper width Lp of a subsequent paper P in the image forming apparatus 1. FIG.

Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and specific examples. However, the present invention is not limited to these embodiments and specific examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.

(1) Overall Configuration and Operation of Image Forming Apparatus (1.1) Overall Configuration of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing an example of a schematic configuration of an image forming apparatus 1 according to the present embodiment, and FIG. 3 is a functional block diagram of a unit 10. FIG.
The image forming apparatus 1 includes an image forming unit 10, a paper feeding device 20 mounted at one end of the image forming unit 10, and a paper discharge that is provided at the other end of the image forming unit 10 and discharges printed paper. Unit 30, an operation information unit 40, and an image processing unit 50 that generates image information from print information transmitted from a host device.

  The image forming unit 10 includes a system control device 11, an exposure device 12, a photoconductor unit 13, a developing device 14, a transfer device 15, paper transport devices 16 a, 16 b and 16 c, and a fixing device 17, and an image processing unit 50. The image information received from is formed as a toner image on the paper P sent from the paper feeding device 20.

  The paper feeding device 20 supplies paper to the image forming unit 10. In other words, a plurality of paper stacking units that store different types of paper P (for example, material, thickness, paper size, and paper size) are provided, and the paper P fed out from any one of the plurality of paper stacking units. Is supplied to the image forming unit 10.

  The paper discharge unit 30 discharges the paper P on which the image is output by the image forming unit 10. For this purpose, the paper discharge unit 30 includes a paper discharge storage unit in which the paper P after image output is discharged. The paper discharge unit 30 may have a function of performing post-processing such as cutting and stapling (stitch binding) on the sheet bundle output from the image forming unit 10.

  The operation information section 40 is used for inputting various settings and instructions and displaying information. That is, it corresponds to a so-called user interface, and is specifically configured by combining a liquid crystal display panel, various operation buttons, a touch panel, and the like.

(1.2) Configuration and Operation of Image Forming Unit In the image forming apparatus 1 having such a configuration, the sheet stacking designated for each sheet of printing in the print job in the sheet feeding device 20 in accordance with the timing of image formation. The paper P that has been fed out from the printing section is fed into the image forming section 10.

  The photoconductor unit 13 includes a photoconductor drum 131 that is provided in parallel below the exposure device 12 and serves as an image carrier that is rotationally driven. A charger 132, an exposure device 12, a developing device 14, a primary transfer roller 152, and a cleaning blade 134 are arranged along the rotation direction of the photosensitive drum 131.

The developing device 14 has a developing housing 141 in which a developer is accommodated. In the developing housing 141, a developing roller 142 disposed to face the photosensitive drum 131 is disposed, and a layer regulating member (not shown) that regulates the layer thickness of the developer is disposed close to the developing roller 142. Has been.
Each of the developing devices 14 is configured in substantially the same manner except for the developer contained in the developing housing 141, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). To do. Each developing device 14 forms a toner band TB as a belt-like toner image in a non-image region located between adjacent toner images on the photosensitive drum 131, and functions as a belt-like toner image forming unit.

  The surface of the rotating photosensitive drum 131 is charged by the charger 132 and an electrostatic latent image is formed by the latent image forming light emitted from the exposure device 12. The electrostatic latent image formed on the photosensitive drum 131 is developed as a toner image by the developing roller 142.

  The transfer device 15 serving as a transfer unit includes an intermediate transfer belt 151 onto which each color toner image formed on the photosensitive drum 131 of each photoconductor unit 13 is transferred, and each color toner image formed on each photoconductor unit 13. Are sequentially transferred (primary transfer) to the intermediate transfer belt 151, and the respective color toner images superimposed and transferred on the intermediate transfer belt 151 are collectively transferred (secondary transfer) to the paper P as a recording medium. Next transfer roller 153, cleaning device 155 for removing residual toner and paper dust adhering to the surface of secondary transfer roller 153, intermediate transfer belt for removing residual toner and paper dust adhering to intermediate transfer belt 151 A cleaner 158 is provided.

  Each color toner image formed on the photoconductive drum 131 of each photoconductive unit 13 is a predetermined transfer from a power supply device 110 controlled by the system control device 11 at a primary transfer portion where the intermediate transfer belt 151 and each photoconductive drum 131 are in contact with each other. The primary transfer roller 152 to which the primary transfer voltage is applied is sequentially electrostatically transferred (primary transfer) onto the intermediate transfer belt 151 to form a superimposed toner image in which the respective color toners are superimposed.

As the intermediate transfer belt 151 moves, the superimposed toner image on the intermediate transfer belt 151 is conveyed to the secondary transfer portion TR in which the secondary transfer roller 153 is disposed in pressure contact with the backup roller 165 via the intermediate transfer belt 151. The
When the superimposed toner image is conveyed to the secondary transfer portion TR, the paper P is supplied from the paper feeding device 20 to the secondary transfer portion TR in accordance with the timing. A predetermined secondary transfer voltage is applied to the backup roller 165 facing the secondary transfer roller 153 via the intermediate transfer belt 151 from the power supply device 110 controlled by the system control device 11 and applied to the paper P. Multiple toner images on the intermediate transfer belt 151 are collectively transferred.

Residual toner on the surface of the photosensitive drum 131 is removed by the cleaning blade 134 and collected in a waste toner container (not shown), and the surface of the photosensitive drum 131 is recharged by the charger 132.
Further, residual toner, paper dust and the like on the intermediate transfer belt 151 after the toner image is secondarily transferred are removed and collected by the intermediate transfer belt cleaner 158, and the surface of the secondary transfer roller 153 is cleaned by the cleaning device 155. Residual toner, paper dust, and the like are removed by the brush 155a and the cleaning blade 155b.

The fixing device 17 includes an endless fixing belt 17a that rotates in one direction, and a pressure roller 17b that rotates in one direction in contact with the circumferential surface of the fixing belt 17a. The pressure contact between the fixing belt 17a and the pressure roller 17b. A nip portion N (fixing region) is formed by the region.
The paper P onto which the toner image has been transferred by the transfer device 15 is conveyed to the fixing device 17 via the paper conveying device 16a with the toner image being unfixed. The toner image is fixed on the sheet P conveyed to the fixing device 17 by the action of pressure bonding and heating by a pair of fixing belts 17a and a pressure roller 17b.

After the fixing, the paper P is sent to the paper discharge unit 30 via the paper transport device 16b.
When outputting images on both sides of the paper P, the front and back sides of the paper P are reversed by the paper transport device 16c and sent again to the secondary transfer unit TR in the image forming unit 10. Then, after the toner image is transferred and the transferred image is fixed, the toner image is sent to the paper discharge unit 30. The paper P sent to the paper discharge unit 30 is subjected to post-processing such as cutting and stapling (needle binding) as necessary, and then discharged to the paper discharge storage unit.

(2) Configuration and Operation of Transfer Device (2.1) Configuration of Transfer Device FIG. 3 is a schematic cross-sectional view showing the configuration of the transfer device 15 including the paper transport unit in the image forming apparatus 1 according to the present embodiment.
The transfer device 15 includes an intermediate transfer belt 151, a primary transfer roller 152, and a secondary transfer roller 153.

The intermediate transfer belt 151 is made of a resin such as polyimide or polyamide containing a suitable amount of a conductive agent such as carbon black, and is formed so that its volume resistivity is 10 ⁶ to 10 ¹⁴ Ω · cm. The thickness is, for example, a film-like endless belt of about 0.1 mm.
The intermediate transfer belt 151 includes a driving roller 161 that circulates and drives the intermediate transfer belt 151, a driven roller 162 that supports the intermediate transfer belt 151 that extends substantially linearly along the arrangement direction of the photosensitive drums 131, and the intermediate transfer belt 151. A tension roller 163 that applies a constant tension to the intermediate transfer belt 151 and prevents the meandering of the intermediate transfer belt 151, and is provided on the upstream side of the secondary transfer portion TR. The support roller 164 that supports the intermediate transfer belt 151, and the secondary transfer portion TR A backup roller 165 is provided, and a cleaning backup roller 166 is provided in a cleaning unit that scrapes residual toner on the intermediate transfer belt 151.

The backup roller 165 is a tube of EPDM and NBR blend rubber with carbon dispersed on the surface, and the inside is made of EPDM rubber so that the surface resistivity is 10 ⁷ to 10 ¹⁰ Ω / □ and the roller diameter is 28 mm. The hardness is set to 70 degrees (Asker C), for example.
The backup roller 165 is disposed on the back side of the intermediate transfer belt 151 and forms a counter electrode of the secondary transfer roller 153. The backup roller 165 is in contact with a metal power supply roller 165A for applying a first bias voltage for forming a secondary transfer electric field in the secondary transfer portion TR.

 The primary transfer roller 152 is provided in the primary transfer portion so as to face each of the photosensitive drums 131 with the intermediate transfer belt 151 interposed therebetween, and a voltage having a polarity opposite to the charging polarity of the toner is applied. As a result, the toner images on the respective photosensitive drums 131 are sequentially electrostatically attracted to the intermediate transfer belt 151 to form toner images superimposed on the intermediate transfer belt 151.

The secondary transfer roller 153 is made of, for example, a semiconductive rubber having a surface resistivity of 10 ⁶ to 10 ¹⁰ Ω · cm having a surface layer made of a urethane rubber tube coated with fluorine, and the roller diameter is 28 mm. The hardness is set to 30 degrees (Asker C), for example.
The secondary transfer roller 153 is arranged to face the backup roller 165 via the intermediate transfer belt 151, and the toner image held by the intermediate transfer belt 151 together with the backup roller 165 for the paper P conveyed from the paper feeding device 20. Is formed as a secondary transfer portion TR.

A cleaning device 155 that removes residual toner, paper dust, and the like adhering to the surface of the secondary transfer roller 153 is disposed opposite to the secondary transfer roller 153.
The cleaning device 155 includes a cleaning brush 155a that disturbs residual toner and paper dust attached to the surface of the secondary transfer roller 153, and a cleaning blade 155b that removes residual toner and paper dust and the like that have been previously disturbed by the cleaning brush 155a. It is composed of
A flicking bar 155c is disposed in contact with the cleaning brush 155a to remove residual toner, paper dust, and the like attached to the surface of the cleaning brush 155a.

  On the downstream side of the secondary transfer unit TR in the paper conveyance direction, a peeling slow current device 156 including an electrode member 156a and a guide guide 156b is disposed. The sheet P onto which the toner image has been secondarily transferred is separated and peeled off from the intermediate transfer belt 151 while being gradually electrified from the back surface of the sheet P by the electrode member 156a, and is guided by the guide guide 156b and then passed through the sheet transport device 16a. Then, it is conveyed to the fixing device 17.

(2.2) Bias Application Control of Transfer Device FIG. 4 is a diagram illustrating the configuration around the secondary transfer portion TR of the image forming apparatus 1 and the passage of the toner band TB in the secondary transfer portion TR.
As shown in FIG. 4, a power supply device 110 that applies a transfer bias voltage is connected to a power supply roller 165 </ b> A that applies a transfer bias to the backup roller 165.

  The power supply device 110 is formed on the intermediate transfer belt 151 and a transfer bias power supply 111 that supplies a current (hereinafter referred to as a transfer current) for transferring the toner image onto the paper P between the secondary transfer roller 153 and the backup roller 165. A cleaning bias power source 112 that supplies a cleaning bias voltage for preventing the transfer of unnecessary toner such as a toner band TB as an example of the belt-shaped toner image to the secondary transfer roller 153 and a switch 113 are provided. .

(2.3) Toner Band Formation and Action In the image forming apparatus 1 configured as described above, the image forming unit 10 also forms a toner image that is not intended for transfer onto the paper P. Specifically, a toner band TB as an example of a belt-like toner image is formed for protecting the cleaning blade 134 of the photosensitive drum 131 and discharging the deteriorated toner in the developing device 14.

For example, when a low density image continues continuously, the toner consumption in the developing device 14 is small, so the time that the toner stays in the developing device 14 becomes long, and the toner is excessively charged by friction and deteriorates. There is a possibility that the granularity of the formed image is deteriorated.
Further, when an image quality adjustment pattern for adjusting the overlapping position of each color toner image on the intermediate transfer belt 151 is formed, the image quality adjustment pattern has a low image density and is frequently subjected to image quality adjustment operations. Further, the toner consumption in the developing device 14 is small, and the toner in the developing device 14 may be excessively frictionally charged and deteriorated.

  Therefore, in the image forming apparatus 1, a non-image area (hereinafter referred to as an inter image portion IM) located between adjacent toner images on the photosensitive drum 131 intersects with the rotational movement direction of the photosensitive drum 131. A toner band TB that is a belt-like toner image extending in the direction (width direction) is formed, and an adjustment operation for forcibly consuming the toner staying in the developing device 14 is performed.

  The toner band TB formed on the photosensitive drum 131 is primarily transferred onto the intermediate transfer belt 151 in the primary transfer portion, and then a cleaning bias voltage is applied to the backup roller 165 in the secondary transfer portion TR, so that the paper P In the end, it is scraped off and collected by the intermediate transfer belt cleaner 158.

(2.4) Secondary Transfer Operation Including Toner Band FIG. 5 shows the toner image on the intermediate transfer belt 151 and the secondary transfer portion TR when the toner band TB is formed in the inter image portion IM with the maximum image formation width. FIG. 6 is a schematic plan view showing the relationship between the image width Lb of the toner band TB and the paper width Lp of the subsequent paper P in the image forming apparatus 1 according to this embodiment. .

When the toner band TB held on the intermediate transfer belt 151 passes through the secondary transfer portion TR, a bias voltage having a polarity opposite to the charging polarity of the toner is applied to the backup roller 165, and the secondary transfer roller 153. Have the same polarity for the toner image.
As a result, the toner band TB does not easily move to the secondary transfer roller 153 and is held on the intermediate transfer belt 151 and moves to the intermediate transfer belt cleaner 158, but a part of the surface layer of the toner band TB is used. The toner adheres to the surface layer of the secondary transfer roller 153 and is removed by the cleaning brush 155a and the cleaning blade 155b of the cleaning device 155 (see FIG. 4).

  The cleaning brush 155a of the cleaning device 155 disturbs the toner adhering to the surface layer of the secondary transfer roller 153, and is easily removed by the cleaning blade 155b. On the other hand, a part of the toner that is disturbed by the cleaning brush 155a floats as a toner cloud (toner floating in the air) in the secondary transfer unit TR, and the gap G between the secondary transfer roller 153 and the peeling slow-down device 156. Are accumulated in the electrode member 156a and the guide guide 156b.

The toner that floats as a toner cloud from the gap G between the secondary transfer roller 153 and the peeling grading device 156 at the secondary transfer portion TR adheres to the back side of the paper P in the region (R1) through which the paper P passes. The sheet P is not conveyed and accumulated in the electrode member 156a and the guide guide 156b.
On the other hand, in the region (R2) outside the passage region (R1) of the paper P, it accumulates in the electrode member 156a and the guide guide 156b, and when the subsequent paper P is wide, There was a risk of backside contamination.

  The image forming apparatus 1 according to the present embodiment includes a toner band generation unit 120 as a belt-like toner image formation control unit controlled by the system control device 11 (see FIG. 2).

  As shown in FIG. 6, the toner band generation unit 120 is used to transfer a toner image following the toner band TB to be formed when the toner band TB as a belt-like toner image is formed in the inter image unit IM. Based on the paper attribute information regarding the paper width Lp of the paper P, the axial length Lb of the photosensitive drum 131 of the toner band TB to be formed is formed to be shorter than the paper width Lp.

The toner band TB and the toner image formed on each photosensitive drum 131 are primarily transferred onto the intermediate transfer belt 151 in the primary transfer portion.
When the toner band TB and the toner image held on the intermediate transfer belt 151 are conveyed to the secondary transfer portion TR, the paper P is supplied from the paper feeding device 20 to the secondary transfer portion TR in accordance with the timing.

  In the secondary transfer unit TR, the secondary transfer roller 153 is in pressure contact with the backup roller 165 via the intermediate transfer belt 151, and the backup roller 165 is previously supplied from the power supply device 110 controlled by the system controller 11. A predetermined cleaning bias and secondary transfer bias are applied, the toner band TB contacts the surface of the secondary transfer roller 153 and passes through the secondary transfer portion TR, and the toner image on the intermediate transfer belt 151 is transferred to the paper P. Batch transfer.

  When the toner band TB passes through the secondary transfer portion TR in contact with the surface of the secondary transfer roller 153, the toner band TB adheres to the surface of the secondary transfer roller 153 and is disturbed by the cleaning brush 155a of the cleaning device 155. Even if a part floats as a toner cloud and leaks to the electrode member 156a or the guide guide 156b side from the gap G between the secondary transfer roller 153 and the peeling slow-down device 156, it is wider than the image width Lb of the toner band TB. It adheres to the back surface of the succeeding paper P having the paper width Lp and is transported and is not accumulated in the electrode member 156a or the guide guide 156b.

  For this reason, when the toner band TB passes through the secondary transfer portion TR, the operation of separating the secondary transfer roller 153 from the surface of the intermediate transfer belt 151 is not required, and the reduction in image formation productivity can be suppressed. it can.

(2.5) Toner Band Formation Conditions The toner band generation unit 120 determines that the paper width Lp of the paper P used for transferring the toner image following the toner band TB to be formed is smaller than the maximum width dimension. The toner band TB is formed by increasing the density compared to the toner band TB formed when the P paper width Lp is the maximum width dimension.
As a result, even when the image area of the formed toner band TB becomes narrow, it is possible to suppress an increase in toner that is excessively charged and stays inside the developing device 14.

The density of the formed toner band TB is determined by changing the intensity of latent image forming light emitted from the exposure device 12 or changing the halftone image density of the toner band TB. This is done by changing the electrostatic latent image.
Further, the developing bias voltage applied to the developing roller 142 of the developing device 14 may be changed.

In addition, when the paper width Lp of the paper P used for transferring the toner image following the toner band TB to be formed is smaller than the maximum width dimension, the toner band generation unit 120 sets the paper width Lp of the paper P to the maximum width. The toner band TB having an image length longer than the image length in the moving direction of the photosensitive drum 131 of the toner band TB formed in the case of the size is formed.
As a result, even when the image width Lb of the formed toner band TB is narrowed, the image area of the formed toner band TB is enlarged, and the excessively charged toner stays inside the developing device 14. Increase can be suppressed.

  As mentioned above, although embodiment concerning this invention was explained in full detail, this invention is not limited to the said embodiment, A various change is made within the range of the summary of this invention described in the claim. Is possible.

  For example, in the present embodiment, the image forming apparatus 1 has been described as a tandem type color printer using an intermediate transfer belt of a secondary transfer roller type, but the image forming apparatus of a secondary transfer belt type having a secondary transfer belt can also be used. Applicable.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Image forming part 11 ... System control apparatus 110 ... Power supply apparatus 111 ... Transfer bias power supply 112 ... Cleaning bias power supply 113 ... Switch 120 ... Toner band generation unit 12 ... exposure device 13 ... photosensitive unit 14 ... developing device 15 ... transfer device 151 ... intermediate transfer belt 152 ... primary transfer roller 153 ... secondary Transfer roller 155 ... Cleaning device 155a ... Cleaning brush 155b ... Cleaning blade 155c ... Flicking bar 156 ... Peeling slow current device 156a ... Electrode member 156b ... Guide guide 158 ..Intermediate transfer belt cleaner 161 ... Drive roller 162 ... Support roller 163 ... Tension Roller 164 ... Support roller 165 ... Backup roller 166 ... Cleaning backup roller 16a, 16b, 16c ... Paper transport device 17 ... Fixing device 20 ... Paper feed device 28 ... Paper guide Guide 30 ... paper discharge unit 40 ... operation information unit 50 ... image processing unit

Claims (5)

Image forming means for forming a toner image on the image carrier using a developer;
Transfer means for transferring a toner image formed on the image carrier to a recording medium;
A belt-like toner image forming unit that forms a belt-like toner image extending in a direction intersecting with the moving direction of the image carrier in a non-image area located between adjacent toner images on the image carrier;
A direction in which the image width of the belt-shaped toner image intersects with the moving direction of the image holding member intersects with the moving direction of the image holding member of the recording medium used for the transfer of the toner image to be subsequently formed. A belt-like toner image formation control means for controlling to form the recording medium shorter than the recording medium width,
An image forming apparatus. The belt-like toner image formation control means increases the image density of the belt-like toner image when the recording medium width is smaller than the maximum width dimension;
The image forming apparatus according to claim 1. The belt-like toner image formation control means increases the image length of the belt-like toner image in the moving direction of the image carrier when the recording medium width is smaller than the maximum width dimension;
The image forming apparatus according to claim 1. The transfer unit includes an intermediate transfer member disposed to face the image carrier, a primary transfer unit that primarily transfers a toner image on the image carrier to the intermediate transfer member at a primary transfer unit, and the intermediate transfer member. Secondary transfer means for secondary transfer of the transferred toner image to the recording medium at a secondary transfer portion;
The secondary transfer means is in contact with the intermediate transfer body when the belt-like toner image held on the intermediate transfer body passes through the secondary transfer portion.
The image forming apparatus according to claim 1. On the computer,
An image forming function for forming a toner image on the image carrier using a developer;
A transfer function for transferring a toner image formed on the image carrier to a recording medium;
A belt-like toner image forming function for forming a belt-like toner image extending in a direction intersecting the moving direction of the image carrier in a non-image region located between adjacent toner images on the image carrier;
A direction in which the image width of the belt-shaped toner image intersects with the moving direction of the image holding member intersects with the moving direction of the image holding member of the recording medium used for the transfer of the toner image to be subsequently formed. A belt-like toner image formation control function for controlling to form shorter than the recording medium width,
A program characterized by that.

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