JP5887787B2 - Image forming apparatus and processing program - Google Patents

Description

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

  An image forming apparatus that forms an image, such as a color copying machine, a color printer, or a multifunction machine having these functions, includes an image forming apparatus that employs an intermediate transfer method.

  In the intermediate transfer method, toner images of a plurality of colors are transferred (primary transfer) on an intermediate transfer belt formed based on, for example, resin, rubber, or a laminate of these, and the toner on the intermediate transfer belt is transferred. In this method, images are transferred onto a sheet of paper (secondary transfer).

  With respect to such an intermediate transfer type image forming apparatus, a technique for providing a member for regulating the distance between the transfer belt and the secondary transfer roller in order to prevent color misregistration that occurs during conveyance of thick paper (see, for example, Patent Document 1) A technique for providing a suction mechanism that applies force to the transfer belt in order to prevent the intermediate transfer belt from wavy is disclosed (for example, see Patent Document 2).

JP 2008-281930 A JP 2005-239369 A

  An object of the present invention is to provide an image forming apparatus and a processing program capable of preventing banding when an image is formed on a recording medium by an intermediate transfer method.

In order to solve the above-described problems, an image forming apparatus according to the present invention includes a primary transfer unit that transfers a toner image developed on an image carrier to an intermediate transfer member, and the image is transferred to the intermediate transfer member. A secondary transfer unit that transfers the toner image to the recording medium; and a control unit, wherein the control unit is configured when the thickness of the recording medium sent to the secondary transfer unit is equal to or greater than a preset thickness. is before the recording medium to the secondary transfer portion is reached, before Symbol primary transfer portion of the transfer of the toner image by controlling the line Migihitsuji to the intermediate transfer member, the registration rollers timed by the registration sensor recording after fed recording medium has reached the secondary transfer portion, the toner image transferred before Symbol intermediate transfer member before a recording medium in the secondary transfer unit arrives at the secondary transfer portion by And transfer it to the medium. The only transfer of number of sheets the toner image of the intermediate transfer preset recording medium relative body stops number of sheets of the pre-set recording medium wherein the intermediate transfer body in the transfer unit Check transfer feed drive, Further, the toner image transferred to the intermediate transfer member after the recording medium reaches the secondary transfer portion is controlled so as not to be transferred to the recording medium .

  According to a second aspect of the present invention, in the image forming apparatus of the first aspect, the thickness of the recording medium is the thickness of the recording medium itself or the recording medium and the recording medium. The thickness includes the transferred toner image.

According to a third aspect of the present invention, there is provided a processing program according to the present invention, wherein the thickness of the recording medium sent to the secondary transfer portion that transfers the toner image transferred to the intermediate transfer member to the recording medium is a predetermined thickness. a process of determining whether, wherein when the thickness or more is preset thickness of the recording medium sent to the secondary transfer unit, before the recording medium to the secondary transfer portion is reached, before Symbol primary wherein the toner image is controlled on the line Migihitsuji the intermediate transfer member, wherein after the recording medium reaches the secondary transfer portion, before the before the recording medium reaches the secondary transfer section in a transfer section The toner image transferred to the intermediate transfer member is transferred to the recording medium in the secondary transfer portion, and the toner images corresponding to the number of recording media set in advance to the intermediate transfer member in the primary transfer portion are transferred. the stop number of sheets of the pre-set recording medium Only the intermediate transfer member to empty transfer feed drive, further wherein said secondary toner image transferred to the intermediate transfer member transferring unit to the recording medium after reaching the the step of controlling so as not to be transferred to the recording medium, the computer It is made to perform.

  According to the first aspect of the present invention, it is possible to provide an image forming apparatus capable of preventing banding when an image is formed on a recording medium by an intermediate transfer method.

  According to the second aspect of the present invention, there is provided an image forming apparatus capable of preventing banding when an image is formed on a recording medium by an intermediate transfer method even in a printing mode such as single-sided printing, double-sided printing or overprinting printing. It becomes possible to do.

  According to the third aspect of the present invention, it is possible to provide a processing program capable of preventing banding when an image is formed on a recording medium by an intermediate transfer type image forming apparatus.

1 is a block diagram of an image forming system according to an embodiment of the present invention. FIG. 2 is a configuration diagram illustrating a configuration example of the image forming apparatus in FIG. 1. FIG. 3 is an enlarged configuration diagram illustrating an image forming unit and a post-processing unit of the image forming apparatus in FIG. 2. FIG. 2 is a diagram illustrating an example of a flowchart of an image forming process of the image forming apparatus in FIG. 1. FIG. 2 is a main part configuration diagram of an image forming unit during an image forming process by the image forming apparatus of FIG. 1. FIG. 6 is a main part configuration diagram of an image forming unit in an image forming process subsequent to FIG. 5. FIG. 7 is a main part configuration diagram of an image forming unit in an image forming process subsequent to FIG. 6. FIG. 8 is a main part configuration diagram of an image forming unit in an image forming process subsequent to FIG. 7. FIG. 9 is a main part configuration diagram of an image forming unit in an image forming process subsequent to FIG. 8. FIG. 10 is a main part configuration diagram of an image forming unit in an image forming process subsequent to FIG. 9. FIG. 2 is an explanatory diagram illustrating an example of skip control for a paper size and a color mode of the image forming apparatus of FIG. 1.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  FIG. 1 is a block diagram of an image forming system SY according to an embodiment of the present invention.

  The image forming system SY includes an image forming apparatus 1 and a host computer 2. The image forming apparatus 1 is, for example, a digital color copying machine, a digital color printer, or a multifunction machine having these functions, and includes an image forming unit 3 and a plurality of paper feeding units 4. The image forming unit 3 and each sheet feeding unit 4 are electrically connected through a communication line 5a, and the image forming unit 3 controls the operation of each sheet feeding unit 4 by performing communication between them. Yes.

The host computer 2 and the image forming unit 3 are, for example, a LAN (Local
The network is electrically connected through a communication line 5b such as an area network or the Internet, and various programs are downloaded from the host computer 2 to the image forming unit 3 and then executed. In this case, examples of the download destination of the program include a memory such as a RAM (Random Access Memory) and a storage device (an example of a storage medium) such as a hard disk.

  The image forming unit 3 is a main body part that prints an image on a sheet (an example of a recording medium) by electrophotography, and includes a system control unit 6, an operation unit 7, an image input unit 8, an image storage unit 9, and image processing. Section 10, image output section 11, post-processing apparatus control section 12, and paper transport section 13.

The system control unit 6 is a control unit that controls the overall operation of the image forming apparatus 1, and includes a CPU (Central Processing Unit), a RAM, and a ROM (Read Only).
Memory) and wiring for electrically connecting them to each other.

  The system control unit 6 performs communication control with each of the paper feeding units 4 described above, an image input unit 8, an image storage unit 9, an image processing unit 10, an image output unit 11, a post-processing device control unit 12, and The operation of the paper transport unit 13 is controlled. In addition, the system control unit 6 recognizes a processing request input from the host computer 2 or the operation unit 7 and accepts the processing request.

  The paper feeding unit 4 is a mechanism unit that feeds paper to the image forming unit 3, and includes a control unit 15, a paper transport unit 16, and a tray control unit 17. The control unit 15 controls the operation of the sheet feeding unit, and includes a CPU, a RAM, a ROM, and wiring for electrically connecting them. The control unit 15 is configured to control operations of the paper transport unit 16 and the tray control unit 17 in addition to exchanging information with the image forming unit 3 described above. The tray control unit 17 is a control unit that controls the operation of a paper feed tray (not shown in FIG. 1) based on an instruction from the control unit 15.

  Next, FIG. 2 is a configuration diagram illustrating a configuration example of the image forming apparatus 1 of FIG.

  The image forming apparatus 1 includes an image forming unit 3, for example, three sheet feeding units 4, an operation unit 7, a post-processing unit 20, and a sheet conveyance path 21.

  Each paper feed unit 4 is provided with a plurality of paper feed trays 4a. Each paper feed tray 4a contains different types of paper (for example, paper size, thickness, paper quality), and the paper fed from any one of the plurality of paper feed trays 4a is input to the image forming unit 3. It comes to be supplied.

  The operation unit 7 includes a touch panel having a liquid crystal display screen, for example. The operation unit 7 displays information indicating the state of the image forming apparatus 1 to the user and inputs setting conditions for the image forming apparatus 1. is there. Examples of setting conditions for the image forming apparatus 1 include an administrator condition and a processing condition.

  The administrator condition includes, for example, setting of paper size, paper quality, discharge tray size, and discharge tray quality. The setting of the discharge stage size (or discharge sheet quality) is for setting so that sheets of the same size (or the same sheet quality) are discharged to the same discharge stage.

  The processing conditions include, for example, automatic paper selection, paper feed stage, paper discharge destination, magnification, cover page mode, and slip sheet mode. The setting of the paper feed stage is for setting a tray in which the paper to be printed is stored among the plurality of paper feed trays 4a of the paper feeding unit 4.

  The post-processing unit 20 is a mechanism unit that discharges the paper after image formation to the paper discharge tray 20a. Further, the post-processing unit 20 is configured to have a post-processing function such as punching, stapling, stacker, offset, or a combination thereof with respect to the paper after image formation.

  A paper transport path 21 (indicated by a thick line) is a path through which paper is transported, and is provided so as to reach the post-processing section 20 from each paper feed section 4 through the image forming section 3. The paper transport path 21 includes a roller for urging the transport of paper, a path switching means for switching the transport path of the paper, a guide rail for guiding the transport of the paper, and a sensor for detecting the passage and arrival of the paper. Is installed.

  Next, FIG. 3 is an enlarged configuration diagram illustrating the image forming unit 3 and the post-processing unit 20 of FIG.

  The image forming unit 3 employs, for example, a tandem type and intermediate transfer type image forming mechanism. For example, six image forming units 25 (25K, 25C, 25M, 25Y, 25X, 25X) are provided. While being arranged in parallel at intervals, an intermediate transfer belt (an example of an intermediate transfer member) 26 is disposed below the intermediate transfer belt 26 so as to be rotationally driven in a circumferential direction.

  The image forming units 25K, 25C, 25M, 25Y, 25X, and 25X respectively intermediate toner images of colors such as black (K), cyan (C), magenta (M), yellow (Y), and special colors (X). The image is transferred onto the transfer belt 26 in a superimposed manner. The special color (X) includes, for example, a transparent color (clear toner) and light magenta.

  Each image forming unit 25 includes a photosensitive drum (an example of an image carrier) 25dr, a charging unit 25e, an exposure unit 25ex, a developing unit 25de, a cleaning unit 25cn, and a primary transfer roller (an example of a primary transfer unit). 25r.

  The charging unit 25e charges the surface of the photosensitive drum 25dr. The exposure unit 25ex irradiates the charged photosensitive drum 25dr with laser light (an example of exposure light) corresponding to image data to form an electrostatic latent image on the surface of the photosensitive drum 25dr. The developing unit 25de applies toner (an example of a developer) to the electrostatic latent image formed on the surface of the photosensitive drum 25dr to form a toner image. The cleaning unit 25cn removes and collects residual toner on the surface of the photosensitive drum 25dr.

  The primary transfer roller 25r transfers the toner image formed on the photosensitive drum 25dr to the intermediate transfer belt 26. In other words, each primary transfer roller 25r of each image forming unit 25 sequentially superimposes and transfers the toner image formed on each photoconductive drum 25dr onto the surface of the intermediate transfer belt 26 that is driven in the circumferential direction. A primary transfer portion FT is formed at the opposite portion between the photosensitive drum 25dr and the primary transfer roller 25r.

  Note that toner cartridges 27K, 27C, 27M, 27Y, 27X, and 27X that supply toner of each color to the image forming units 25K, 25C, 25M, 25Y, 25X, and 25X are installed on the upper portion of the image forming unit 3. Yes.

  The intermediate transfer belt 26 is formed, for example, by forming a film based on a single layer of a polyamide resin having flexibility, a single layer of rubber, or a laminate thereof in a strip shape, and both ends of the strip-shaped film are welded or the like. By connecting, it is formed in an endless belt shape.

  In the image forming unit 3, a plurality of registration rollers 31, a secondary transfer roller (an example of a secondary transfer unit) 32, and a fixing unit 33 are installed in the paper conveyance path 21. The paper transport path 21a is a reverse path for double-sided printing.

  The registration roller 31 sets the timing for feeding the paper P to the secondary transfer roller 32 so that the image forming position of the paper P sent from the paper feeding unit 4 and the position of the toner image Ti of the intermediate transfer belt 26 coincide with each other.

  The secondary transfer roller 32 is a component that transfers the toner image Ti of the intermediate transfer belt 26 onto the paper P sent to the secondary transfer roller 32, and a position where the intermediate transfer belt 26 and the paper conveyance path 21 are in contact with each other. Is arranged. A secondary transfer portion ST is formed at a portion where the secondary transfer roller 32 and the intermediate transfer belt 26 face each other.

  The fixing unit 33 fixes the toner image by applying heat and pressure to the paper P on which the toner image has been transferred by the secondary transfer roller 32.

  In the post-processing unit 20, a deflection correcting unit 35 is installed in the paper transport path 21. The deflection correcting unit 35 is a mechanism that mechanically flattens the bent paper P. Since the bending state can be recognized by the degree of application of the toner image printed on the paper P, the path is switched accordingly. Correct the deflection.

  Next, an example of an image forming process of the image forming apparatus 1 according to the present embodiment will be described with reference to FIG.

  In the present embodiment, it is first determined whether or not banding countermeasures are necessary (step 101 in FIG. 4). In the banding, the intermediate transfer belt 26 undulates due to an impact applied to the intermediate transfer belt 26, and in this state, the toner image on the photosensitive drum 25 dr is primarily transferred to the intermediate transfer belt 26, thereby causing belt-like density unevenness. This is a phenomenon in which strip-shaped density unevenness occurs in the printed image on the paper P due to the secondary transfer.

  When no banding countermeasure is required, primary transfer skip control, which will be described later, is not performed, and primary transfer and secondary transfer are sequentially performed under normal control (steps 102 and 103 in FIG. 4).

  On the other hand, if banding countermeasures are necessary, it is determined whether the thickness of the sheet P set by the user is, for example, 105 gsm (Gram per Square Meter) or more (step 104 in FIG. 4). When the thickness of the paper P is less than 105 gsm, the primary transfer skip control is not performed, and the primary transfer and the secondary transfer are sequentially performed under normal control (steps 102 and 103 in FIG. 4). In this case, the thickness of the paper P is the thickness of the paper P itself that does not include the thickness of the toner image.

  On the other hand, when the thickness of the paper P is 105 gsm or more, the intermediate transfer belt 26 is shocked by the paper P that has reached the secondary transfer portion ST and becomes a wavy state. When the toner image on the drum 25dr is transferred to the intermediate transfer belt 26 and transferred to the paper P in the secondary transfer portion ST, the above banding occurs.

  Therefore, when the thickness of the sheet is, for example, 105 gsm or more, a period from when the impact is reduced by the sheet that has reached the secondary transfer portion ST until the impact subsides (that is, when the intermediate transfer belt 26 is During a period of undulation due to impact and deterioration of the quality of the printed image, primary transfer to the intermediate transfer belt 26 is temporarily stopped, and control (skip control) is performed to drive the intermediate transfer belt 26 to idle transfer feeding (skip control) ( Step 105 in FIG.

  Here, a specific method example of the skip control of the primary transfer portion FT will be described with reference to FIGS. 5 to 10 are main part configuration diagrams of the image forming unit 3 during the image forming process. 5 to 10 indicate a skip area in which the intermediate transfer belt 26 is fed by idle transfer without primary transfer. Here, the sheet size is SRA3S, and the color mode of the image forming apparatus is four colors (for this reason, in FIGS. 5 to 10, for example, only four photosensitive drums 25dr from the left are used for transfer). This will be described as an example.

  First, FIG. 5 shows a state before the paper P waits on a registration roller (not shown in FIG. 5) and is sent to the secondary transfer unit ST. Since this stage is before the intermediate transfer belt 26 receives an impact, the toner images on the respective photosensitive drums 25dr are transferred onto the intermediate transfer belt 26 in an overlapping manner. Here, primary transfer of, for example, two sheets of paper P is performed on the intermediate transfer belt 26, and two toner images Ti are formed.

  Subsequently, the intermediate transfer belt 26 is fed and driven so that the position of the toner image Ti for the first sheet P of the intermediate transfer belt 26 is sent to the secondary transfer portion ST. The first sheet P is sent to the secondary transfer portion ST so that the position is aligned with the toner image Ti.

  In the secondary transfer portion ST, the toner image Ti of the toner image Ti on the intermediate transfer belt 26 is transferred to the first sheet P. On the other hand, while the intermediate transfer belt 26 is impacted and waved by the paper P that has reached the secondary transfer portion ST, the primary transfer to the intermediate transfer belt 26 is not performed, and the intermediate transfer belt 26 is idle-transferred ( Skip control). Here, on the intermediate transfer belt 26, for example, primary transfer for two sheets of paper P is skipped.

  Subsequently, as shown in FIG. 6, the intermediate transfer belt 26 is fed and driven so that the position of the toner image Ti for the second sheet P of the intermediate transfer belt 26 is sent to the secondary transfer portion ST. Then, the second sheet P is sent to the secondary transfer portion ST so that the position thereof is aligned with the toner image Ti of the intermediate transfer belt 26. Here, on the intermediate transfer belt 26, for example, primary transfer for three sheets of paper P is skipped.

  In the secondary transfer unit ST, the toner image Ti of the intermediate transfer belt 26 is transferred onto the second sheet P, while the primary transfer skip control is performed on the intermediate transfer belt 26. As shown in FIG. 7, after the first sheet P reaches the secondary transfer portion ST, for example, primary transfer for four sheets of the sheet P is skipped on the intermediate transfer belt 26, and four skip areas are formed. Ni comes to be formed.

  Subsequently, as shown in FIG. 8, two sheets of paper P are sent to a registration roller (not shown in FIG. 8) to enter a standby state. On the other hand, for the intermediate transfer belt 26, the undulation due to the impact is stopped and there is no risk of banding, so the primary transfer of the toner image for the first sheet P on standby is resumed.

  Subsequently, as shown in FIG. 9, the toner for the second sheet P on standby with respect to the intermediate transfer belt 26 while the sheet P is kept on standby by a registration roller (not shown in FIG. 9). The primary transfer of the image is performed.

  Subsequently, as shown in FIG. 10, the intermediate transfer belt 26 is driven and driven so that the position of the toner image Ti for the first sheet P of the intermediate transfer belt 26 is sent to the secondary transfer portion ST. Then, the first sheet P is sent to the secondary transfer unit ST so that the position thereof is aligned with the toner image Ti of the intermediate transfer belt 26. From here, it returns to FIG. 5 and the same process is repeated.

  As described above, according to the present embodiment, the primary transfer is skipped while the intermediate transfer belt 26 is undulated by the impact of the sheet P sent to the secondary transfer unit ST, and the intermediate transfer belt 26 Since the banding is prevented by performing the primary transfer after the undulation is settled, the quality of the image formed on the paper P by the intermediate transfer type image forming apparatus 1 is improved.

  Further, another member is not added to determine whether or not an impact is generated on the intermediate transfer belt 26, and a new one is determined by determining the thickness of the sheet P sent to the secondary transfer portion ST. The quality of the image formed on the paper P by the intermediate transfer type image forming apparatus 1 is improved without providing a member or the like.

  Next, FIG. 11 shows an example of skip control in the primary transfer unit FT for the paper size and color mode.

  For example, when the paper size is SRA3S or A3S and the color mode is 4-color or 5-color, two sheets of paper P are printed in the secondary transfer unit ST, and four sheets of paper P are skipped in the primary transfer unit FT. Is done.

  For example, when the paper size is SRA3S or A3S and the color mode is 6 color, two sheets of paper P are printed in the secondary transfer unit ST, and five sheets of paper P are skipped in the primary transfer unit FT. .

  For example, when the paper size is A4L and the color mode is 4 colors, 5 colors, or 6 colors, 4 sheets of paper P are printed in the secondary transfer unit ST, respectively, and 7 sheets of paper P are printed in the primary transfer unit FT. 8 sheets, 8 sheets or 9 sheets are skipped.

  Although the invention made by the present inventor has been specifically described based on the embodiment, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. Should not be considered. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.

  For example, in the above-described embodiment, the case where it is determined whether or not to perform the skip control of the primary transfer portion based on the thickness of the paper has been described. However, the present invention is not limited to this, and the skip control of the primary transfer portion according to the print mode. It may be determined whether or not to perform.

  For example, skip control at the primary transfer unit is also performed when reprint printing is performed on one side of a sheet on which an image has already been formed to form an image and double-sided printing is performed on both sides of the sheet. May be. In the case of reprint printing or double-sided printing, there is no problem when the first image is formed, but since the toner image is formed on the paper and the thickness is increased when the second image is formed, it is sent to the secondary transfer section the second time. The intermediate transfer belt may be impacted by the paper and the above banding may occur. Therefore, even when additional printing or double-sided printing is performed, by performing skip control of the primary transfer portion, banding is prevented and the quality of the image formed on the paper is improved. Note that the thickness of the paper in these cases is the thickness of the paper itself plus the thickness of the toner image.

  Moreover, in the said embodiment, when using a program, you may store and provide in recording media, such as CD-ROM.

  In other words, the program including the processing program configured in steps 101 to 105 is not limited to being recorded in a storage device such as a hard disk, and the program may be provided as follows.

  For example, the program may be stored in the ROM, and the CPU may load the program from the ROM to the main storage device and execute it.

  The program may be stored and distributed in a computer-readable storage medium such as a DVD-ROM, CD-ROM, MO (magneto-optical disk), or flexible disk.

  In the above description, as the recording medium conveyed in the image forming apparatus of the present invention, various media on which an image is formed, such as a film and a postcard, are applied.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Host computer 3 Image forming part 4 Paper feed part 4a Paper feed tray 5a Communication line 5b Communication line 6 System control part 7 Operation part 8 Image input part 9 Image storage part 10 Image processing part 11 Image output part 12 Post-processing Device control unit 13 Paper transport unit 15 Control unit 16 Paper transport unit 17 Tray control unit 20 Post-processing unit 20a Paper discharge tray 21 Paper transport path 25 Image forming units 25K, 25C, 25M, 25Y, 25X, 25X Image forming unit 25dr Photosensitive Body drum 25e charging means 25ex exposure means 25de developing means 25cn cleaning means 25r primary transfer roller 26 intermediate transfer belt 31 registration roller 32 secondary transfer roller 33 fixing unit SY image forming system Ti toner image Ni skip area FT primary transfer portion ST secondary Transfer part P Paper

Claims (3)

A primary transfer unit that transfers the toner image developed on the image carrier to an intermediate transfer member;
A secondary transfer unit that transfers the toner image transferred to the intermediate transfer member to a recording medium;
Control means;
With
The control means includes
If the thickness of the recording medium sent to the secondary transfer portion is greater than or equal to a preset thickness ,
Before reaching the recording medium to the secondary transfer portion, the toner image is controlled on the line Migihitsuji before Symbol primary transfer portion with respect to the intermediate transfer member,
After recording medium fed by the registration roller timed by the registration sensor has reached the second transfer portion, the recording medium to the secondary transfer portion is transferred before Symbol intermediate transfer member prior to reaching toner The image is transferred to the recording medium in the secondary transfer unit, and the transfer of the toner images corresponding to the number of recording media set in advance to the intermediate transfer member in the primary transfer unit is stopped to be set in advance. The intermediate transfer member is idle-transfer fed by the number of recording media, and the toner image transferred to the intermediate transfer member after the recording medium reaches the secondary transfer portion is controlled not to be transferred to the recording medium. ,
An image forming apparatus. The thickness of the recording medium is the thickness of the recording medium itself, or the thickness including the recording medium and the toner image transferred to the recording medium,
The image forming apparatus according to claim 1, wherein: Determining whether or not the thickness of the recording medium sent to the secondary transfer unit that transfers the toner image transferred to the intermediate transfer member to the recording medium is a preset thickness;
Wherein when the thickness of the recording medium sent to the secondary transfer portion is not less than predetermined thickness, before the recording medium to the secondary transfer unit is reached, the intermediate transfer body before Symbol primary transfer unit the transfer of the toner image by controlling the line Migihitsuji respect, the after the recording medium reaches the secondary transfer portion are transferred before Symbol intermediate transfer member before the recording medium reaches the secondary transfer section The transferred toner image is transferred to the recording medium in the secondary transfer unit, and the transfer of the toner images corresponding to the number of recording media set in advance to the intermediate transfer member in the primary transfer unit is stopped to perform the preset. The intermediate transfer member is idle-transfer fed as many times as the number of the recorded recording media, and the toner image transferred to the intermediate transfer member after the recording medium reaches the secondary transfer portion is not transferred to the recording medium. Control process,
A processing program for causing a computer to execute.

Images