阅读说明：本技术 图像形成装置以及记录介质 (Image forming apparatus and recording medium ) 是由 村上大辅 于 2019-05-16 设计创作，主要内容包括：使形成在感光体上的调色剂像经由中间转印带转印到纸张的中间转印方式的图像形成装置(100)具备：一次转印辊,其隔着中间转印带与感光体对置地配置,并与感光体形成一次转印辊隙部；移动机构(151),其使一次转印辊在沿着中间转印带的移动方向的方向上移动；压力可变机构(152),其使一次转印辊对中间转印带的按压力变更；以及控制部(41),其控制移动机构(151)以及压力可变机构(152),并基于图像形成对象的纸张的纸张信息,设定一次转印辊的相对于中间转印带的抵接位置以及按压力。(The image forming apparatus (100) for the intermediate transfer mode for making the toner image being formed on photoreceptor be transferred to paper via intermediate transfer belt has: primary transfer roller, it is opposed to configure across intermediate transfer belt with photoreceptor, and forms primary transfer nip portion with photoreceptor；Mobile mechanism (151) moves primary transfer roller on the direction along the moving direction of intermediate transfer belt；Pressure changeable mechanism (152) changes primary transfer roller to the pressing force of intermediate transfer belt；And control unit (41), it controls mobile mechanism (151) and pressure changeable mechanism (152), and the paper information of the paper of object is formed based on image, set the abutted position and pressing force relative to intermediate transfer belt of primary transfer roller.)

1. a kind of image forming apparatus is to make to be formed in as the toner image in carrying body is transferred to paper via middle transfer body Intermediate transfer mode image forming apparatus, wherein have:

Transfer roll, across above-mentioned middle transfer body with above-mentioned as carrying body is opposed to configure, and with above-mentioned as carrying body is formed Nip portion；

Mobile mechanism moves above-mentioned transfer roll on the direction of the moving direction along above-mentioned middle transfer body；

Pressure changeable mechanism changes above-mentioned transfer roll to the pressing force of above-mentioned middle transfer body；And

Control unit controls above-mentioned mobile mechanism and above-mentioned pressure changeable mechanism, and forms the paper of object based on image Paper information sets the abutted position and pressing force relative to above-mentioned middle transfer body of above-mentioned transfer roll.

2. image forming apparatus according to claim 1, wherein

In the case that above-mentioned control unit is the case where the paper that image forms object is concave-convex paper and other than it, switch above-mentioned support Connect position and above-mentioned pressing force.

3. image forming apparatus according to claim 1 or 2, wherein

Above-mentioned control unit controls above-mentioned mobile mechanism, from the rotation center that connects above-mentioned transfer roll and the above-mentioned rotation as carrying body Turn the straight line at the center first position vertical relative to above-mentioned middle transfer body, arrives compared with above-mentioned first position to above-mentioned centre The moving direction of transfer article become predetermined distance downstream side the second position until between, set above-mentioned abutted position,

And above-mentioned pressure changeable mechanism is controlled, above-mentioned abutted position more subtracts more from said second position close to above-mentioned first position Small above-mentioned pressing force.

4. image forming apparatus according to claim 3, wherein

Above-mentioned control unit makes above-mentioned abutted position above-mentioned the in the case where the paper that image forms object is other than concave-convex paper Two positions,

In the case where the paper that image forms object is concave-convex paper, make the above-mentioned first position of above-mentioned abutted position or with it is upper The second position is stated compared to the specified position close to above-mentioned first position.

5. image forming apparatus described according to claim 1~any one of 4, wherein

Above-mentioned transfer roll is middle part for rotary axis direction, compared with both ends between both ends to being radially expanded It is coronal.

6. image forming apparatus described according to claim 1~any one of 5, wherein

If changing the above-mentioned abutted position of above-mentioned transfer roll and the setting of above-mentioned pressing force, above-mentioned control unit is executed for making The stabilized image quality stabilization processes of image quality.

7. image forming apparatus described according to claim 1~any one of 6, wherein

Above-mentioned control unit image formed object paper be with making its surface portion become concaveconvex shape paper in the case where, In the image to the paper is formed, the above-mentioned abutted position of above-mentioned transfer roll and the setting of above-mentioned pressing force are changed.

8. a kind of recording medium is the recording medium that the computer for the nonvolatile for storing program can be read, wherein

The program makes the computer of image forming apparatus play a role as control unit,

Above-mentioned image forming apparatus has:

Transfer roll, across middle transfer body with as carrying body is opposed to configure, and with above-mentioned as carrying body forms nip portion；

Mobile mechanism moves above-mentioned transfer roll on the direction of the moving direction along above-mentioned middle transfer body；And

Pressure changeable mechanism changes above-mentioned transfer roll to the pressing force of above-mentioned middle transfer body,

Above-mentioned image forming apparatus is to make to be formed in the above-mentioned toner image as in carrying body to transfer via above-mentioned middle transfer body To the image forming apparatus of the intermediate transfer mode of paper,

Above-mentioned control unit controls above-mentioned mobile mechanism and above-mentioned pressure changeable mechanism, and forms the paper of object based on image Paper information sets the abutted position and pressing force relative to above-mentioned middle transfer body of above-mentioned transfer roll.

9. recording medium according to claim 8, wherein

In the case that above-mentioned control unit is the case where the paper that image forms object is concave-convex paper and other than it, switch above-mentioned support Connect position and above-mentioned pressing force.

10. according to recording medium described in claim 8 or 9, wherein

Above-mentioned control unit controls above-mentioned mobile mechanism, from the rotation center that connects above-mentioned transfer roll and the above-mentioned rotation as carrying body Turn the straight line at the center first position vertical relative to above-mentioned middle transfer body, arrives compared with above-mentioned first position to above-mentioned centre The moving direction of transfer article become predetermined distance downstream side the second position until between, set above-mentioned abutted position,

And above-mentioned pressure changeable mechanism is controlled, above-mentioned abutted position more subtracts more from said second position close to above-mentioned first position Small above-mentioned pressing force.

11. recording medium according to claim 10, wherein

Above-mentioned control unit makes above-mentioned abutted position above-mentioned the in the case where the paper that image forms object is other than concave-convex paper Two positions,

In the case where the paper that image forms object is concave-convex paper, make the above-mentioned first position of above-mentioned abutted position or with it is upper The second position is stated compared to the specified position close to above-mentioned first position.

12. the recording medium according to any one of claim 8~11, wherein

Above-mentioned transfer roll is middle part for rotary axis direction, compared with both ends between both ends to being radially expanded It is coronal.

13. the recording medium according to any one of claim 8~12, wherein

If changing the above-mentioned abutted position of above-mentioned transfer roll and the setting of above-mentioned pressing force, above-mentioned control unit is executed for making The stabilized image quality stabilization processes of image quality.

14. the recording medium according to any one of claim 8~13, wherein

Above-mentioned control unit image formed object paper be with making its surface portion become concaveconvex shape paper in the case where, In the image to the paper is formed, the above-mentioned abutted position of above-mentioned transfer roll and the setting of above-mentioned pressing force are changed.

Technical field

The present invention relates to image forming apparatus and recording mediums.

Background technique

In the past, popularize by the toner image being formed in photoreceptor (as carrying body) be transferred to intermediate transfer belt (in Between transfer article), and by the toner image on intermediate transfer band be secondarily transferred to the intermediate transfer mode of paper image formed dress It sets.

In the image forming apparatus, there are the photoreceptor and primary transfer roller due to being opposed to configuration across intermediate transfer belt Between electric discharge, and generate the bad situation of image.For example, being that can not transfer the toner institute for losing charge by electric discharge Caused white dirt (small white spots) is recycled due to electric discharge and the toner of the polarity of charge reversion in the primary transfer portion in downstream The images such as caused wavy irregular colour (ripple) are bad.

In order to inhibit such image bad, usually in image forming apparatus, turned with becoming intermediate relative to photoreceptor The mode for printing the downstream side of the moving direction of band configures primary transfer roller with deviating.In such a configuration, as shown in Figure 6A, one Secondary transfer roll 61 presses intermediate transfer belt 62 with defined pressing force, so intermediate transfer belt 62 is wound in photoreceptor 63, is formed Primary transfer nip portion N1.

However, in recent years, in such image forming apparatus, urgent expectation is in embossed paper, rag paper etc. on surface with recessed Image is formed on the paper (concave-convex paper) of convex form.

Known in secondary transfer printing, toner is difficult to reach its recess portion in concave-convex paper, and secondary compared with common paper Transferability deteriorates.

Therefore, it is proposed in the case where concave-convex paper carries out image formation, by weakening primary transfer roller compared with usually To the pressing force of intermediate transfer belt, makes the toner on intermediate transfer band be easy to remove from band, make the two of the recess portion of concave-convex paper The technology that secondary transferability improves (for example, referring to Japanese Unexamined Patent Publication 2010-139955 bulletin).

However, if weaken primary transfer roller pressing force, primary transfer roller as described above relative to photoreceptor at In the configuration of offset as downstream side for the moving direction of intermediate transfer belt, as shown in Figure 6B, have due to intermediate transfer belt 62 tension pushes back primary transfer roller 61 without forming primary transfer nip portion N1, and primary transfer reduce significantly it is such Problem.

Summary of the invention

Problem of the present invention is that independently being protected well in the image forming apparatus of intermediate transfer mode with paper Hold primary transfer and secondary transfer printing.

At least one of according to the first aspect of the invention, to achieve the goals above, image of the invention forms dress Setting is the image for making to be formed in the intermediate transfer mode for being transferred to paper via middle transfer body as the toner image in carrying body Device is formed, is had:

Transfer roll, across above-mentioned middle transfer body with above-mentioned as carrying body is opposed to configure, and with above-mentioned as carrying body Form nip portion；

Mobile mechanism moves above-mentioned transfer roll on the direction of the moving direction along above-mentioned middle transfer body；

Pressure changeable mechanism changes above-mentioned transfer roll to the pressing force of above-mentioned middle transfer body；And

Control unit controls above-mentioned mobile mechanism and above-mentioned pressure changeable mechanism, and the paper of object is formed based on image The paper information opened, sets the abutted position and pressing force relative to above-mentioned middle transfer body of above-mentioned transfer roll.

According to the second aspect of the invention, reflect the first aspect of the present invention recording medium be store program it is non-temporarily When the recording medium that can read of computer,

The program makes to have: transfer roll, across middle transfer body with as carrying body is opposed to configure, and with above-mentioned as carrying on a shoulder pole Carrier forms nip portion；

Mobile mechanism moves above-mentioned transfer roll on the direction of the moving direction along above-mentioned middle transfer body；With And

Pressure changeable mechanism changes above-mentioned transfer roll to the pressing force of above-mentioned middle transfer body,

And make to be formed in the centre that the above-mentioned toner image as in carrying body is transferred to paper via above-mentioned middle transfer body The computer of the image forming apparatus of transfer modes plays a role as control unit,

The control unit controls above-mentioned mobile mechanism and above-mentioned pressure changeable mechanism, and the paper of object is formed based on image Paper information, set the abutted position and pressing force relative to above-mentioned middle transfer body of above-mentioned transfer roll.

Detailed description of the invention

According to the detailed description following referring to attached drawing, the above-mentioned purpose of the disclosure and other purposes, feature, advantage become It obtains definitely.But it is limited the invention not by these attached drawings, wherein

Fig. 1 is the figure for indicating the outline structure of image forming apparatus involved in present embodiment.

Fig. 2 is the block diagram for indicating the main function of image forming apparatus and constituting.

Fig. 3 A is the enlarged diagram for indicating the periphery of primary transfer roller.

Fig. 3 B is the enlarged diagram for indicating the periphery of primary transfer roller.

Fig. 3 C is the enlarged diagram for indicating the periphery of primary transfer roller.

Fig. 4 is the flow chart for indicating the adjustment processing of primary transfer roller.

Fig. 5 A is the figure for illustrating the state of the primary transfer roller in primary transfer roller adjustment processing.

Fig. 5 B is the figure for illustrating the state of the primary transfer roller in primary transfer roller adjustment processing.

Fig. 6 A is the figure for illustrating conventional problems point.

Fig. 6 B is the figure for illustrating conventional problems point.

Specific embodiment

Hereinafter, being illustrated with reference to attached drawing to one or more embodiments of the invention.However, the scope of the present invention is not It is defined in the disclosed embodiments.

[composition of image forming apparatus]

Firstly, being illustrated to the composition of the image forming apparatus in present embodiment.

Image forming apparatus in present embodiment is the coloured silk that the intermediate transfer mode of electronic photo technology is utilized Color image forming apparatus.

Fig. 1 is the schematic configuration diagram of image forming apparatus 100.Fig. 2 is to indicate that the function of image forming apparatus 100 is constituted Block diagram.

As shown in Figure 1, 2, image forming apparatus 100 is configured to have image forming unit 10, sheet feed section 30, control unit 41, operation portion 42, display unit 43, storage unit 44 and communication unit 45 etc., each portion are connected by bus.

Image forming unit 10 has corresponding with yellow (Y), magenta (M), cyan (C), the various colors of black (K) Photoreceptor (as carrying body) 11Y, 11M, 11C, 11K, electro-mechanical part 12Y, 12M, 12C, 12K, exposure portion 13Y, 13M, 13C, 13K, Development section 14Y, 14M, 14C, 14K, primary transfer roller 15Y, 15M, 15C, 15K, photoreceptor cleaning section 16Y, 16M, 16C, 16K, Intermediate transfer belt (middle transfer body) 17, secondary transfer roller 18, fixing section 19 and sensor 20.

Photoreceptor 11Y, 11M, 11C, 11K are formd by the outer peripheral surface of the metallic matrix in drum type by containing organic light-guide electricity The Organophotoreceptor for the photosensitive layer that the resin of body is constituted is constituted.In addition, in the following description, sometimes by photoreceptor 11Y, 11M, 11C, 11K concentration are recorded as photoreceptor 11.

Electro-mechanical part 12Y, 12M, 12C, 12K make photoreceptor 11Y, 11M, 11C, 11K with negative polarity electrification using charger Constant current potential.

Exposure portion 13Y, 13M, 13C, 13K are made of laser light source, polygonal mirror, lens etc., the image based on various colors Data are scanned exposure by surface of the laser beam to photoreceptor 11Y, 11M, 11C, 11K and form electrostatic latent image.

Development section 14Y, 14M, 14C, 14K, which have, to be configured to via developing regional and photoreceptor 11Y, 11M, 11C, 11K couple The development sleeve set.It is for example applied with to the electrification polarity same polarity with electro-mechanical part 12Y, 12M, 12C, 12K i.e. in development sleeve The DC voltage of negative polarity has been overlapped the developing bias after alternating voltage, as a result, to being formed in photoreceptor 11Y, 11M, 11C, 11K Electrostatic latent image on supply developer, photoreceptor 11Y, 11M, 11C, 11K formed various colors toner image.Developer packet Carrier containing toner and for making charged toner.Toner is not particularly limited, be able to use generally use it is known Toner.

Primary transfer roller 15Y, 15M, 15C, 15K is opposed with photoreceptor 11Y, 11M, 11C, 11K across intermediate transfer belt 17 Ground configures to form primary transfer nip portion N1, makes the toner for the various colors being formed on photoreceptor 11Y, 11M, 11C, 11K As successively transferring in (primary transfer) to intermediate transfer belt 17.It is formed on intermediate transfer belt 17 as a result, and has been overlapped four kinds of face The color toner picture of the toner image of color.In addition, in the following description, sometimes by primary transfer roller 15Y, 15M, 15C, 15K concentration is recorded as primary transfer roller 15.

Photoreceptor cleaning section 16Y, 16M, 16C, 16K remove the periphery of photoreceptor 11Y, 11M, 11C, 11K after transfer Upper remaining toner.

Intermediate transfer belt 17 is the endless belt set up by multiple rollers (driven roller, idler roller, driven voller), and to the arrow of Fig. 1 Driving is directed around shown in head A.As long as intermediate transfer belt 17 has desired transferability, it is not particularly limited material Matter, thickness.

Secondary transfer roller 18 abuts configuration with opposed roll 18a via intermediate transfer belt 17 and forms secondary transfer printing roll gap portion N2, So that the color toner picture in transfer belt 17 formed between is transferred (secondary transfer printing) together and arrives the paper S supplied from sheet feed section 30 A face on.

Fixing section 19 is made on the toner fixing to paper S being transferred on paper S by heating pressurization.

Sensor 20 for example configures the primary transfer roller of the black (K) of the most downstream on the moving direction of intermediate transfer belt 17 The downstream and the defined position before arrival secondary transfer printing roll gap portion N2 of gap portion N1.Sensor 20 uses CCD (Charge Coupled Device charge-coupled device) etc. imaging sensors read the toner image in transfer belt 17 formed between, and Such as image color amendment when obtaining for forming image, or the image information for rationalizing the condition of image formation.

Here, the composition of primary transfer roller 15 is described in detail.

Fig. 3 A~Fig. 3 C is the enlarged diagram for indicating the periphery of primary transfer roller 15.

As described above, primary transfer roller 15 is opposed to configure across intermediate transfer belt 17 and photoreceptor 11.

The primary transfer roller 15 of present embodiment, which has, makes the primary transfer roller 15 to moving along intermediate transfer belt 17 The mobile mobile mechanism 151 in the direction in direction (referring to Fig. 2).That is, primary transfer roller 15 can be changed by mobile mechanism 151 Abutted position (hereinafter simply referred to as " abutted position of primary transfer roller 15 " relative to intermediate transfer belt 17.).

Mobile mechanism 151 is for example configured to have the convex of the rotation shaft support movement for making to be arranged in primary transfer roller 15 The driving portion of wheel and driving cam, makes actuated by cams specified amount by driving portion, can make rotary shaft and then make primary transfer roller 15 mobile predetermined distances.

Specifically, in the present embodiment, the abutted position of primary transfer roller 15 can be switched to base position P0 (first position), position P1 (specified position) and three positions position P2 (second position).

As shown in Figure 3A, base position P0 is the rotation center for connecting the rotation center and photoreceptor 11 of primary transfer roller 15 Straight line (chain-dotted line) position vertical relative to intermediate transfer belt 17.

As shown in Figure 3B, position P1 is the downstream to become the moving direction of intermediate transfer belt 17 compared with the P0 of base position The mode of side deviates the position of predetermined distance configuration.

As shown in Figure 3 C, position P2 is to deviate what predetermined distance configured in a manner of becoming further downstream compared with the P1 of position Position.

For example, position P1 be from base position P0 to the position of the downstream side 0.5mm of the moving direction of intermediate transfer belt 17, Position P2 is from base position P0 to the position of the downstream side 5mm of the moving direction of intermediate transfer belt 17.

In addition, primary transfer roller 15 be given as defined in pressing force to pressing intermediate transfer belt 17 (photoreceptor 11), by This, forms primary transfer nip portion N1 between primary transfer roller 15 and photoreceptor 11.

The primary transfer roller 15 of present embodiment have make primary transfer roller 15 to the pressing force of intermediate transfer belt 17 (with Under, it is only called " pressing force of primary transfer roller 15 ".) change pressure changeable mechanism 152 (referring to Fig. 2).Pressure changeable mechanism 152 force application parts such as being configured to have the spring to exert a force to primary transfer roller 15 and change the active force of force application part Driving portion, change the active force of force application part by driving portion, can make primary transfer roller 15 press intermediate transfer belt 17 Power change.

Specifically, accordingly switching the pressing force of primary transfer roller 15 with the abutted position of primary transfer roller 15.One In the case that the abutted position of secondary transfer roll 15 is position P1, the pressing force of primary transfer roller 15 is set to defined pressing force F1, the abutted position of primary transfer roller 15 be position P2 in the case where, the pressing force of primary transfer roller 15 be set to than by Pressure F1 big pressing force F2.

For example, pressing force F1 is 1N, pressing force F2 is 10N.

Therefore, as the abutted position of primary transfer roller 15 is far from base position P0, the pressing force of primary transfer roller 15 increases Greatly, primary transfer roller 15 is made to become strong close to the power of photoreceptor 11.In addition, as the abutted position of primary transfer roller 15 is close to benchmark The pressing force of position P0, primary transfer roller 15 become smaller, and primary transfer roller 15 is made to die down close to the power of photoreceptor 11.

In this way, since primary transfer roller 15 is with pressing force corresponding with its abutted position pressing intermediate transfer belt 17, so No matter in which abutted position, primary transfer nip portion N1 can be formed between primary transfer roller 15 and photoreceptor 11.

Back to Fig. 1,2, has sheet feed section 30 in the lower part of image forming apparatus 100, which has and can dismantle Paper feeding cassette 31.The paper S for being accommodated in paper feeding cassette 31 is sent out by paper feed roller 32 one by one since the paper of its topmost To transport path.

Control unit 41 is by CPU (Central Processing Unit: central processing unit), ROM (Read Only Memory: read-only memory), RAM (Random Access Memory random access memory) etc. constitute, uniformly control image shape At the processing movement in each portion of device 100.CPU reads the various processing routines for being stored in ROM and is deployed in RAM, and according to exhibition The program opened executes various processing.

For example, control unit 41 when carrying out image formation on paper S, is executed according to paper information, primary transfer roller is adjusted 15 relative to the abutted position of intermediate transfer belt 17 and the processing (primary transfer roller adjustment processing) of pressing force.

Operation portion 42 have be formed as cover display unit 43 display picture on touch panel, digital button, start by The various operation buttons such as button, the operation signal of the operation based on user is exported to control unit 41.

Display unit 43 is made of LCD (Liquid Crystal Display: liquid crystal display), and according to from control unit 41 The instruction of the display signal of input, shows various pictures.

Storage unit 44 is made of storage devices such as non-volatile semiconductor memory, hard disks, and storage has with various processing The data etc. of pass.

Communication unit 45 is between the external device (ED) that the networks such as LAN (Local Area Network: local area network) are connect Carry out the transmitting and receiving of data.

[primary transfer roller adjustment processing]

Next, being illustrated to the movement of image forming apparatus 100.

The image forming apparatus 100 of present embodiment is when carrying out image formation on paper S, by executing according to as it Image forms the paper information of the paper S of object, adjusts the abutted position relative to intermediate transfer belt 17 of primary transfer roller 15 And the primary transfer roller adjustment processing of pressing force, primary transfer and secondary transfer printing can be kept well.

Fig. 4 is the flow chart for indicating the adjustment processing of primary transfer roller.In addition, as the reception that image forms task executes this The processing of sample.

As shown in figure 4, firstly, whether the paper S that control unit 41 judges that image forms object is to have concave-convex on surface The paper (step S1) of shape.

Here, " there is the paper (hereinafter referred to as " concave-convex paper " of concaveconvex shape on surface.) " for example refer to its surface roughness In 10 μm or more of paper, embossed paper, rag paper etc. can be enumerated.

Control unit 41 judges that image is formed based on the paper information specified before the execution that image forms processing by user Whether the paper S of object is concave-convex paper.

It is further possible to be configured to have optical sensor in paper feeding cassette 31 or transport path etc., passed by the optics Sensor, detection image forms the surface roughness of used paper S, so that whether the paper S for judging that image forms object is recessed Convex paper.

Moreover, the control of control unit 41 is primary transfer roller 15 in the case where being judged as not is concave-convex paper (step S1: no) As " the first setting " (step S2).

" first sets " refer to the abutted position of primary transfer roller 15 as P2 (away from base position P0 downstream side 5mm), once The pressing force of transfer roll 15 is the setting of F2 (10N).

On the other hand, in the case where being judged as concave-convex paper (step S1: yes), the control of control unit 41 is to make primary transfer roller 15 become " the second setting " (step S3).

" second sets " refer to the abutted position of primary transfer roller 15 as P1 (away from base position P0 downstream side 0.5mm), one The pressing force of secondary transfer roll 15 is the setting of F1 (1N).

In addition, the abutted position of " the second setting " is also possible to base position P0, but influenced in order to prevent by tolerance And the position of primary transfer roller 15 becomes upstream side relative to photoreceptor 11, and in the present embodiment, be set as position P1 (under Swim side 0.5mm).In the case where making the abutted position benchmark position P0 of " the second setting ", P0 setting ratio in base position is pressed Pressure F1 weak pressing force F0.

Next, control unit 41 judges whether to change setting for primary transfer roller 15 when last image formation Fixed (abutted position and pressing force of primary transfer roller 15) (step S4).

Moreover, be judged as changed in the case where (step S4: yes), control unit 41 execute image quality stabilization processes (step S5).

Specifically, control unit 41 detects the dense of the toner image in transfer belt 17 formed between by sensor 20 Degree, and developing bias is adjusted in such a way that its value becomes defined concentration.

This is primary transfer and secondary transfer printing variation due to the setting of change primary transfer roller 15 in order to prevent, And it is formed in the processing that the image color on paper S changes and executes.

On the other hand, it is judged as (step S4: no) in the case where not changing in S4 through the above steps, alternatively, In After the image quality stabilization processes of above-mentioned steps S5 terminate, control unit 41 issues the instruction (step for starting to be formed to the image of paper S It is rapid 6), and terminate present treatment.

Fig. 5 A is primary turn (in the case that image formation object is not concave-convex paper) in the case where indicating " the first setting " Print the schematic diagram of roller 15 and intermediate transfer belt 17.

As shown in Figure 5A, when carrying out image formation on the paper S not for concave-convex paper, primary transfer roller 15 is configured to relatively Become the downstream side (position P2) of the moving direction of intermediate transfer belt 17 in photoreceptor 11, and gives the (pressing of enough pressing forces Power F2), so intermediate transfer belt 17 is wound in photoreceptor 11 and forms primary transfer nip portion N1.

Therefore, the image for being able to suppress generation due to the electric discharge between photoreceptor 11 and primary transfer roller 15 is bad, energy Access good image.

In addition, Fig. 5 B be indicate second set in the case where primary turn of (image formed object be concave-convex paper in the case where) Print the schematic diagram of roller 15 and intermediate transfer belt 17.

As shown in Figure 5 B, when concave-convex paper carries out image formation, there is the image of the anxiety of the paper generation other than concave-convex paper Bad (small white spots or ripple) unobtrusively, so making primary transfer roller 15 compared with the paper other than concave-convex paper the case where Close to photoreceptor 11 (position P1).In addition, weakening the pressing of primary transfer roller 15 compared with the paper other than concave-convex paper the case where Power (pressing force F1) makes the toner on intermediate transfer belt 17 be easy to remove from intermediate transfer belt 17 in secondary transfer printing.

Therefore, in the bad inconspicuous concave-convex paper of image, connecing for primary transfer roller 15 and photoreceptor 11 can kept While touching, keep the secondary transfer printing of the recess portion to concave-convex paper good, good image can be obtained.

[effect of present embodiment]

As described above, according to the present embodiment, image forming apparatus 100 is the toner for making to be formed on photoreceptor 11 Image forming apparatus 100 as being transferred to the intermediate transfer mode of paper S via intermediate transfer belt 17, has: primary transfer roller 15, it is opposed to configure across intermediate transfer belt 17 and photoreceptor 11, forms primary transfer nip portion N1 with photoreceptor 11；It is mobile Mechanism 151 moves primary transfer roller 15 on the direction of the moving direction along intermediate transfer belt 17；Pressure changeable mechanism 152, change primary transfer roller 15 to the pressing force of intermediate transfer belt 17；And control unit 41, control mobile mechanism 151 And pressure changeable mechanism 152, and the paper information of the paper S based on image formation object, set the phase of primary transfer roller 15 For the abutted position and pressing force of intermediate transfer belt 17.

Therefore, the paper S of object is formed according to image, changes the abutted position and pressing force of primary transfer roller 15, institute Independently primary transfer and secondary transfer printing can be kept well with paper.

In addition, according to the present embodiment, control unit 41 can control mobile mechanism 151, P0~position P2 in base position Between change the abutted position of primary transfer roller 15, and control pressure changeable mechanism 152, abutted position is more from position P2 close to base Level sets P0, more reduction pressing force.

Therefore, can be configured to periodically change pressing force according to abutted position.

In addition, according to the present embodiment, control unit 41 the case where the paper S that image forms object is concave-convex paper and its In the case where in addition, change abutted position and pressing force.

Therefore, in the case where capable of being configured to the case where paper is concave-convex paper and other than it, abutted position can be changed And pressing force.

In addition, according to the present embodiment, control unit 41 is the case where the paper S that image forms object is other than concave-convex paper Under, make abutted position position P2, in the case where concave-convex paper, makes abutted position benchmark position P0 or compared with the P2 of position Close to the position P1 of base position P0.

Therefore, can be configured to form phase with the image to the paper other than it in the image formation to concave-convex paper Compare, makes the abutted position of primary transfer roller 15 close to photoreceptor 11, and weaken pressing force.

In addition, according to the present embodiment, if control unit 41 changes the abutted position and pressing force of primary transfer roller 15, holding Row is for making the stabilized image quality stabilization processes of image quality.

Therefore, it can prevent the setting due to primary transfer roller 15 from changing, and the concentration etc. for the image being formed on paper S Image quality changes.

Furthermore it is possible to be not limited to above-mentioned embodiment using embodiments of the present invention, this can not departed from It is suitably changed in the range of the purport of invention.

Although primary transfer roller 15 is also possible to revolve it for example, in the above-described embodiment and not specifically mentioned For rotor shaft direction, the middle part compared with both ends between both ends is coronal to what is be radially expanded.For example, both ends and centre The diameter difference in portion is at 100 μm with first-class.

Primary transfer roller 15 in the case where the primary transfer roller 15 of such shape, with the rectilinear form of no diameter difference It compares, although ends are easy non-contact in 1N etc., by the control of above embodiment, can prevent transferability from deteriorating.

In addition, though in the above-described embodiment, control as being capable of abutting position in three modes to primary transfer roller 15 It sets and is switched over pressing force, but also can keep abutted position is corresponding with pressing force to close as table or chart in advance System, and carry out pressing force as needed and determine the such control of abutted position.For example, being also able to carry out the table according to paper S The necessary conditions such as face rugosity, carried charge, environment and developer resume, it is enough secondary can ensure the recess portion of concave-convex paper The mode of transferability determines the pressing force of primary transfer roller 15, and primary using determining according to table or chart decision Between the pressing force primary transfer roller 15 and photoreceptor 11 of transfer roll 15 will not non-contacting abutted position control.

In addition, image can not be carried out on partly rolling the paper S for having printed pattern of indentations in the entire surface of paper S It is formed.

In this case, being controlled if the paper S that image forms object is become concaveconvex shape paper with making its surface portion Portion 41 processed is also able to carry out the abutted position to primary transfer roller 15 in image formation and pressing force carries out the control of setting change System.Specifically, can by the region of the embossing of the detections paper S such as specified or optical sensor according to user, and The boundary in the region of embossing and other regions, temporarily ceases the conveying of paper S, and change pressing force and abutted position it Afterwards, restart the processing of the conveying of paper S, Lai Jinhang image is formed.

The embodiment of the present invention is described in detail and is illustrated above, but the disclosed embodiments are to be used for The example of explanation, it's not limited to that.The scope of the present invention is explained according to the term in claims.

The priority for the Japanese patent application No. 2018-095018 that disclosure opinion was proposed on May 17th, 2018, and This reference entire contents.