CN100545760C

CN100545760C - Image processing system

Info

Publication number: CN100545760C
Application number: CNB200480029344XA
Authority: CN
Inventors: 森本成则; 山田雅则; 高井康博
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2003-10-08
Filing date: 2004-10-01
Publication date: 2009-09-30
Anticipated expiration: 2024-10-01
Also published as: CN1864107A; JP3737501B2; JP2005115074A

Abstract

The inboard of the mobile route of the ring-type that forms at the intermediate transfer belt (11) that is erected between driven roller (11A) and the driven voller (11B) disposes: first offset cam (211 that contacts with the inner peripheral surface of intermediate transfer belt (11), 221), respectively with first offset cam (211,221) second offset cam (212 that rotates integratedly, 222), with second offset cam (212, the cam follower (214 of side face contact 222), 224), with with cam follower (214,224) keep the transfer roll (transferring elements of 413A～13D) (215A～215D) respectively.According to the state of contact of the inner peripheral surface of first offset cam (211,221) and intermediate transfer belt (11), change the transferring elements (transfer roll of 215A～215D) keep (upper-lower position of 13A～13D).

Description

Image processing system

Technical field

The present invention relates to form tone a plurality of image forming parts of different images mutually along the image that a direction disposes side by side by the electrofax mode, across intermediate transfer belt or transfer printing conveying belt, can on recording mediums such as paper, form the image processing system of the cascade system of full-color (full color) image.

Background technology

In recent years, concerning the image processing system of electrofax mode, not only form monochrome image, and form full-color image require surgingly, the exploitation of the full-color image processing system of electrofax mode is advancing.Usually, full-color image processing system carried out each data in the view data of the multiple color tones that look decomposes to coloured image, used the toner of corresponding tone to carry out image and formed.For example, the color filter of trichromatic each tone (red, green, blue) by adding the mixture of colours reads same coloured image, at least make the view data of trichromatic each tone (blue or green, pinkish red, Huang) of the mixing of losing lustre according to the data that read, view data according to each tone, use the toner of corresponding tone to make visual picture, overlap by visual picture, form full-color image each tone.

In so full-color image processing system, each tone is all needed exposure process, developing procedure and transfer printing process, simultaneously the location of the visual picture of each tone becomes problem, and the image of full-color image forms speed and forms slow-footed deep impression to the people than the image of monochrome image.

Therefore, so far, proposed a kind of so full-color image processing system of cascade system: rotation is provided with the endless belt of semiconduction freely, moving direction along the outer peripheral face of endless belt, a plurality of image forming parts that will individually form the mutual different visual picture of tone respectively are configured to row, and endless belt forms a full-color image at least during rotating a circle.

In the full-color image processing system of cascade system, the visual picture of the various tones that employing will form in each image forming part overlaps after on the outer peripheral face of endless belt, the intermediate transfer mode of transfer printing on paper; The perhaps visual picture of the various tones that will form in each image forming part, transfer printing is sought the high speed that full-color image forms at the lip-deep transfer printing mode of movement that is attracted to the recording medium of carrying on the outer peripheral face of endless belt successively.When full-color image forms, the outer peripheral face of endless belt in the intermediate transfer mode, in the transfer printing mode of movement, the surface of the recording medium of being carried by endless belt contacts with the image carrier that individually possesses in the pressure of regulation and each image forming part.

The transfer printing mode of movement since the direct transfer printing of visual picture that will in each image forming part, form on the surface of recording medium, only need carry out the advantage that the primary transfer operation can be finished so have to each tone, but, carries recording medium owing to being adsorbed on the endless belt, so not only need to be used to the structure that makes recording medium charged, and the charged particles of recording medium exerts an influence to the transfer printing state of visual picture, has the shortcoming that makes image form the state deterioration.Different therewith, though the intermediate transfer mode will need not make recording medium charged to twice transfer printing process of row of transferring in of all kinds for conveying, it is in good condition that image is formed, and this point is noticeable.

On the other hand, although the requirement that full-color image forms is increased, but present, the monochrome image of black tone forms and is still main flow, wishes the further high speed of formation of monochrome image.For this reason, in full-color image processing system, be necessary to solve the low speedization that monochrome image that a plurality of image forming parts of disposing via being used to form full-color image carry out forms.

In addition, when the monochrome image in the full-color image processing system of cascade system formed, only the single image forming part in a plurality of image forming parts carried out image formation, does not carry out image and form in remaining image forming part.Like this, when forming, monochrome image in the obsolete image forming part, also is necessary to prevent because the deterioration of the image carrier that the image carrier contact causes on endless belt or recording medium or the colour mixture of toner.

In addition, do not carry out that monochrome image forms and full-color image when forming any one and standby among both, if endless belt is in and each image carrier state of contact, then endless belt deforms.In addition, when blocking (jam) processing, the recording medium that remains between image carrier and the endless belt can not be taken out, the replacing and the cleaning of parts can not be carried out during upkeep operation.

Therefore, in the full-color image processing system of existing cascade system, disclose except formation and lost lustre the image forming part that the three primary colors image separately that mixes uses, also has the image forming part that forms picture black, and, when forming monochrome image and when forming full-color image, change the position of endless belt with respect to these image forming parts, seek the structure (for example, with reference to patent documentation 1～3) of the high speed of monochrome image formation.

In these existing structures, make and set up endless belt and revolving force supplied to the driven roller of endless belt and at least one side in the driven voller moves with respect to image forming part.In these structures, when endless belt moves, set up the driven roller of endless belt and the axle base of driven voller and always keep necessarily, do not consider the perimeter change of endless belt, endless belt is moved.

Patent documentation 1: Japanese patent laid-open 10-039651 communique

Patent documentation 2: Japanese patent laid-open 10-293437 communique

Patent documentation 3: No. 2574804 communique of Jap.P.

But, in above-mentioned existing structure, when forming monochrome image and when forming full-color image, the position of endless belt is moved, the unlikely generation harmful effect of image carrier that possesses for obsolete image forming part when forming monochrome image, be necessary to make the amount of movement of driven roller or driven voller big, have the problem of the maximization that causes device.

In addition, the image carrier that each image forming part possesses contacts with the transfer area of endless belt at the Rack that is known as the transfer printing pincers, in this transfer area, endless belt is according to the surface curvature of image carrier and bending, so always keeping the axle base of driven roller and driven voller in the certain structure, the endless belt that the image carrier that obsolete image forming part possesses during from the formation monochrome image leaves takes place loosening, exists endless belt that the problem of wriggling takes place.

The object of the present invention is to provide a kind of maximization of not generation device and the wriggling of endless belt, can form content, make endless belt contact or leave the image processing system of image carrier according to image.

Summary of the invention

As the method that solves above-mentioned problem, image processing system of the present invention is characterised in that to possess:

The endless belt that also forms banded mobile route that sets up between the driven roller of the stationkeeping in device and the driven voller;

At a plurality of image carriers that in the specialized range of the moving direction of above-mentioned endless belt, are set up in parallel;

Be configured in the inboard of above-mentioned mobile route, across relative with the above-mentioned a plurality of image carriers respectively a plurality of transfer members of the part of above-mentioned endless belt;

Make each above-mentioned a plurality of transfer members be toward or away from the transfer member travel mechanism of above-mentioned a plurality of image carriers respectively; With

Follow the action of above-mentioned transfer member travel mechanism, make above-mentioned endless belt connect the structure of disembarking with the band that above-mentioned a plurality of image carriers contact respectively or leave.

In this structure, a plurality of transfer members according to the mobile route inboard that is positioned at the band shape that is formed by endless belt are toward or away from a plurality of image carriers across endless belt respectively, do not follow the driven roller that endless belt sets up and the shift in position of driven voller, endless belt contacts or leaves a plurality of image carriers respectively.Therefore, do not use the mechanism of the complexity of the position that is used to change driven roller or driven voller, endless belt contacts or leaves a plurality of image carriers respectively.

In addition, the invention is characterized in, possess:

(1) endless belt that also forms banded mobile route that sets up between the driven roller of the stationkeeping in device and the driven voller;

Turning axle with the rotating shaft that is parallel to above-mentioned driven roller and driven voller is the center, the offset cam that is rotated with the anglec of rotation that forms the content of action based on image;

Convert the change in radius of the regulation anglec of rotation of above-mentioned offset cam to the transfer member travel mechanism of connecing from the shift in position of direction with respect to the above-mentioned image carrier of above-mentioned transfer member; With

Above-mentioned transfer member travel mechanism card is ended,, make the tension part of the mobile route distortion of above-mentioned endless belt with the action interlock of above-mentioned transfer member travel mechanism.

In this structure, if offset cam is rotated with the anglec of rotation according to the content that image forms action, the change in radius of the anglec of rotation of the regulation of offset cam then, travel mechanism is delivered to transfer member across transfer member, with transfer member with respect to the connecing when direction changes the position of image carrier, make the mobile route distortion of endless belt by tension part with transfer member travel mechanism interlock.Therefore, the a plurality of transfer members that are positioned at the mobile route inboard of the ring-type that is formed by endless belt clip endless belt respectively, according to being toward or away from a plurality of image carriers respectively, not following the driven roller that sets up endless belt and the change in location of driven voller, endless belt contacts or leaves a plurality of image carriers respectively.

If employing the present invention, then clip endless belt respectively owing to be positioned at a plurality of transfer members of the mobile route inboard of the ring-type that forms by endless belt, be toward or away from a plurality of image carriers respectively, do not follow the driven roller that sets up endless belt and the change in location of driven voller, endless belt is contacted respectively or leave a plurality of image carriers, so be the state that forms the content of action according to image for the mobile route that makes endless belt, do not need to use and be used to make driven roller or driven voller to change the mechanism of the complexity of position, the miniaturization of energy implement device.

Description of drawings

Fig. 1 is the key diagram of structure of the image processing system of expression embodiments of the present invention.

Fig. 2 is the transfer member travel mechanism that possesses in the above-mentioned image processing system of expression and is with the structural drawing that connects the structure of disembarking.

Fig. 3 is the synoptic diagram of the mobile route of the intermediate transfer belt in the above-mentioned image processing system of expression.

Fig. 4 is the transfer member travel mechanism that possesses in the above-mentioned image processing system of expression and is with the structural drawing that connects the structure of disembarking.

Fig. 5 is the synoptic diagram of the mobile route of the intermediate transfer belt in the above-mentioned image processing system of expression.

Fig. 6 is the side view of the roller that comprises in the tension part in the above-mentioned image processing system.

Fig. 7 is the structured flowchart of the control part of the above-mentioned image processing system of expression.

Fig. 8 is the process flow diagram of the above-mentioned image processing system of expression handling procedure of control part when beginning to switch on.

Fig. 9 is the process flow diagram of the expression input handling procedure of control part when having image from the image output device of outside to form request.

Figure 10 is first offset cam in the above-mentioned image processing system and the front elevation and the side view of second offset cam.

Symbol description:

11 intermediate transfer belts

The 11a driven roller

The 12b driven voller

13a～13d transfer roll

100 image processing systems

101a～101d photosensitive drums

210 monochrome image moving-members

211,221 first offset cams

212,222 second offset cams

214,224 cam followers

215a～215d transferring elements

220 coloured image moving-members

230 tension parts

231 levers

232 rollers

233 rotating shafts

Embodiment

Below, the image processing system of the preferred forms that present invention will be described in detail with reference to the accompanying.

Fig. 1 is the key diagram of structure of the image processing system of expression embodiments of the present invention.Image processing system 100 forms polychrome and monochromatic image according to the view data of transmitting from the outside to recording mediums such as paper.For this reason, image processing system 100 possesses: ((((104A～104D), intermediate transfer belt (being equivalent to endless belt of the present invention) 11, intermediate transfer rollers (are equivalent to transfer member of the present invention for 103A～103D), cleaning unit 104 for 102A～102D), charged roller 103 for 101A～101D), developing cell 102 for exposing unit E, photosensitive drums (being equivalent to image carrier of the present invention) 101.Hereinafter to be referred as transfer roll) 13 (13A～13D), secondary transfer roller 14, fixing device 15, paper feed path P 1, P2, P3, paper feeding cassette 16, manual feed trays 17 and discharge trays 18 etc.

Image processing system 100 uses corresponding to the view data that has added each tone of four looks of deceiving (K) in the trichromatic green grass or young crops (C) that mixes, pinkish red (M) and yellow (Y) are lost lustre in the conduct of coloured image being carried out look decomposition acquisition, carries out image formation.(((103A～103D), (13A～13D) (104A～104D) respectively be provided with four respectively corresponding to each tone constitutes four image forming part PA～PD to transfer roll 13 to photosensitive drums 101 with cleaning unit 104 for 102A～102D), charged roller 103 for 101A～101D), developing cell 102.Image forming part PA～PD is arranged in row on the moving direction (sub scanning direction) of intermediate transfer belt 11.

Charged roller 103 is to make the charged device of the surface of photosensitive drums 101 with the way of contact of the current potential uniform charged of regulation.Also can use the charged device of the way of contact of adopting charged brush, or adopt the charged device of the mode that is touched of charged charger (charger) to replace charged roller 103.Exposing unit E possesses not shown semiconductor laser, polygon mirror and catoptron etc., by being radiated at respectively on photosensitive drums 101A～101D, on the surface of photosensitive drums 101A～101D, form sub-image corresponding to view data according to laser beam black, blue or green, that the view data of pinkish red and yellow each tone is modulated.On each photosensitive drums 101A～101D, form sub-image by the view data decision of each black, blue or green, pinkish red and yellow tone.

But, photosensitive drums 101A forms the image carrier that the monochrome image of the present invention of black toner picture is used when forming monochrome image, photosensitive drums 101B～101D forms the image carrier that the coloured image of the present invention of the trichromatic toner picture that mixes of losing lustre is used respectively when forming coloured image.

Developing cell 102 makes image development become the toner picture on the surface of developer replenishing to the photosensitive drums 101 that is formed with sub-image.That each developing cell 102A～102D accommodates respectively is black, blue or green, the developer of pinkish red and yellow each tone, makes the image development of each tone that forms respectively on each photosensitive drums 101A～101D become toner picture black, blue or green, pinkish red and yellow each tone.Cleaning unit 104 will remain in the lip-deep toner of the photosensitive drums 101 after development, the image transfer printing and remove, reclaims.

The intermediate transfer belt 11 that is configured in photosensitive drums 101 tops is erected between driven roller 11A and the driven voller 11B, forms the mobile route of ring-type.The outer peripheral face of intermediate transfer belt 11 is relative with photosensitive drums 101A with photosensitive drums 101D, photosensitive drums 101C, photosensitive drums 101B successively.Transfer roll 13A～13D is configured in the relative position with each photosensitive drums 101A～101D across intermediate transfer belt 11.To be added on transfer roll 13A～13D with the transfer bias of the charged polarity opposite polarity of toner, in order to the toner that carries on the surface with photosensitive drums 101A～101D as transfer printing on intermediate transfer belt 11.Thus, (101A～101D) upward the superimposed successively transfer printing of toner picture of each tone of formation forms full-color toner picture on the outer peripheral face of intermediate transfer belt 11 on the outer peripheral face of intermediate transfer belt 11 in photosensitive drums 101.

But, under the situation of a part of view data of only having imported blue or green, pinkish red, Huang and black tone, only on a part of photosensitive drums 101, carry out the formation of sub-image and toner picture among four photosensitive drums 101A～101D corresponding to the tone of the view data of input.When for example forming monochrome image, only carry out the formation of sub-image and the formation of toner picture on corresponding to the photosensitive drums 101A of black tone, a toner picture transfer printing of black is on the outer peripheral face of intermediate transfer belt 11.

The resilient material (for example EPDM, foaming urethanes etc.) of each transfer roll 13A～13D by electric conductivity cover diameter be 8～10mm with metal (for example stainless steel) be material spool the surface on constitute, the resilient material by electric conductivity is applied to high voltage on the intermediate transfer belt 11 equably.Also can replace transfer roll 13 with the intermediate transfer element of brush and sac like.

As mentioned above, the rotation of the toner picture that forms on the outer peripheral face of intermediate transfer belt 11 by intermediate transfer belt 11 is transported to the position relative with secondary transfer roller 14.When forming image, secondary transfer roller 14 is pressed with the pincers of regulation and is crimped on the outer peripheral face of intermediate transfer belt 11.The paper of supplying with from paper feeding cassette 16 or manual feed trays 17 is applied on the secondary transfer roller 14 with the high voltage of the charged polarity opposite polarity of toner by between secondary transfer roller 14 and the intermediate transfer belt 11 time.Thus, the toner picture is transferred on the surface of paper from the outer peripheral face of middle transfer belt 11.

In addition, for being pressed, the pincers of secondary transfer roller 14 and intermediate transfer belt 11 maintain setting, constitute secondary transfer roller 14 or the driven roller 11A either party among both by hard material (metal etc.), making the opposing party is soft materials such as resilient roller (elastic caoutchouc roller or foaminess resin roll etc.).

In addition, for preventing in next operation, to mix, when the toner that is attached to from photosensitive drums 101 on the intermediate transfer belt 11, be not transferred to the toner that remains on the paper on the intermediate transfer belt 11 by 12 pairs of cleaning units and reclaim.

Transfer printing the paper of toner picture be directed in the fixing device 15, between warm-up mill 15A and backer roll 15B, pass through, heat and pressurize.Thus, on the surface of the paper that firmly fixed of toner picture.The paper that toner is looked like to fix by exit roller 18A is discharged on the discharge tray 18.

In image processing system 100, be provided with the paper that is used for being housed in carton 16 via between secondary transfer roller 14 and the intermediate transfer belt 11 and fixing device 15, deliver to the paper feed path P 1 of the approximate vertical direction of discharge tray 18.In paper feed path P 1, dispose: the paper in the carton 16 is one by one called out to pick-up roller 16A in the paper feed path P 1; The conveying roller R that carry the principal direction top that will be accessed; The paper of carrying is directed at official hour and stops roller 19 between secondary transfer roller 14 and the intermediate transfer belt 11; With the exit roller 18A that paper is discharged in the discharge tray 18.

In addition, in the inside of image processing system 100, from manual feed trays 17 to stopping the roller 19, form the paper feed path P 2 that disposes pick-up roller 17A and conveying roller R.In addition, be formed with paper feed path P 3 upstream side that stops roller 19 from exit roller 18A to paper feed path P 1.

Exit roller 18A can rotate freely along positive and negative both direction, when on the one side of paper, forming the one-sided image formation of image, when second image in forming with the dual-side image that forms image on the two sides of paper forms, drive, paper is discharged in the discharge tray 18 along positive veer.On the other hand, when first image during dual-side image forms forms, distributing roller 18A is after the rear end of paper drives by the positive veer in edge before the fixing device 15, and the state lower edge reverse direction of the rearward end of paper in clamping drives, and paper is imported in the paper feed path P 3.Thus, only be formed with the paper of image when the two sides image forms, under the state that pros and cons and front and back end are put upside down, be imported in the paper feed path P 1 in one side.

Stop roller 19 paper will be from carton 16 or manual feed trays 17 that supply with or that carry via paper feed path P 3, according to and synchronous time of the rotation of intermediate transfer belt 11 import between secondary transfer roller 14 and the intermediate transfer belt 11.For this reason, stop that roller 19 stops the rotation when photosensitive drums 101 or intermediate transfer belt 11 action beginnings, the paper of supplying with or carrying before intermediate transfer belt 11 rotations touches under the state that stops roller 19 at front end, stops at moving in the paper feed path P 1.After this, in the position of secondary transfer roller 14 and intermediate transfer belt 11 crimping, and the relative moment of leading section of the toner picture that on the leading section of paper and intermediate transfer belt 11, forms, stop that roller 19 begins rotation.

Fig. 2 is the transfer member travel mechanism that possesses in the image processing system of expression first embodiment of the present invention and is with the structural drawing that connects the structure of disembarking.Intermediate transfer belt 11 is erected between driven roller 11A and the driven voller 11B, is formed with the mobile route of the ring-type that comprises the scope that roughly is level up and down.Photosensitive drums 101A～101D of image formation position (station) PA～PD is configured in the below of intermediate transfer belt 11.Photosensitive drums 101A～101D is set up in parallel along the downside scope of the mobile route of intermediate transfer belt 11, and the outer peripheral face of intermediate transfer belt 11 is relative with photosensitive drums 101A～101D in the downside scope of mobile route.11A rotates in the direction of arrow A by driven roller, and intermediate transfer belt 11 moves in the downside scope of mobile route in the direction of arrow B.

Inboard at the mobile route of the ring-type of intermediate transfer belt 11 disposes image and forms transfer roll (the being equivalent to transfer member of the present invention) 13A～13D that comprises among the PA～PD of position.Each transfer roll 13A～13D clip intermediate transfer belt 11 with the relative position of each photosensitive drums 101A～101D, (Y-Y direction) moves and to be supported by axle freely along the vertical direction.Therefore, transfer roll 13A～13D can be toward or away from photosensitive drums 101A～101D.Transfer roll 13A～13D is applied the elastic force of regulation upward.

Inboard at the mobile route of the ring-type of intermediate transfer belt 11, dispose first offset cam 211,221 that connects the structure of disembarking as band of the present invention, with second offset cam 212,222, cam follower 214,224 and transferring elements 215A～215D as transfer member of the present invention travel mechanism.Second offset cam 212, cam follower 214 and transferring elements 215A constitute monochrome image of the present invention moving-member 210, and offset cam 222, cam follower 224 and transferring elements 215B～215D constitute coloured image of the present invention moving-member 220.First offset cam 211 and second offset cam 212 are that the center rotates integratedly with same rotating shaft 213.First offset cam 221 and second offset cam 222 are that the center rotates integratedly with same rotating shaft 223.The shaft parallel ground configuration of rotating shaft 213,223 and driven roller 11A and driven voller 11B.

With in the moving-member 210, cam follower 214 freely moves on (X-X direction) in the horizontal direction at monochrome image, and the end of cam follower 214 contacts with the side face of second offset cam 212.Cam follower 214 is applied to second offset cam, 212 sides by the elastic force of not shown elastomeric element.Transferring elements 215A moves up at upper and lower and is supported on freely on the cam follower 214, and the elastic force by spring 216A is applied to the below.On transferring elements 215A, at the diverse location of above-below direction and horizontal direction, form from the top and support recess 215AA (being equivalent to second maintaining part of the present invention) and the recess 215AB (being equivalent to first maintaining part of the present invention) that black image forms the transfer roll 13A that comprises the PA of position.

Rotation by second offset cam 212, in a single day change from the distance of the side face of rotating shaft 213 to second offset cams 212, then cam follower 214 together changes the position in the horizontal direction with transferring elements 215A, and the recess 215AA of transferring elements 215A or the side among the recess 215AB are positioned at the top of transfer roll 13A selectively.In transferring elements 215A, be formed with recess 215AA and recess 215AB in different position up and down.In addition, transfer roll 13A is by afterburning upward.Therefore, the upper-lower position of transfer roll 13A is stipulated by transferring elements 215A, rotation by second offset cam 212, be positioned at the top of transfer roll 13A according to recess 215AA or recess 215AB, change the upper-lower position of transfer roll 13A, transfer roll 13A is toward or away from as the photosensitive drums 101A of monochrome image with image carrier.

With in the moving-member 220, cam follower 224 along continuous straight runs freely move at coloured image, the side face contact of end second offset cam 222 of cam follower 224.Cam follower 224 is applied to second offset cam, 222 sides by the elastic force of not shown elastomeric element.Transferring elements 215B～215D moves up at upper and lower and is supported on freely on the cam follower 224, and the elastic force by spring 216B～216D applies downwards.On transferring elements 215B～215D, the diverse location of above-below direction and horizontal direction be formed with from above support recess 215BA, 215BB～215DA, the 215DB that each blue or green, pinkish red and yellow color image forms the transfer roll 13B～13D that comprises the PB～PD of position.Recess 215BA, 215CA, 215DA are equivalent to second maintaining part of the present invention, and recess 215BB, 215CB, 215DB are equivalent to first maintaining part of the present invention.

Rotation by second offset cam 222, in a single day change from the distance of the side face of rotating shaft 223 to second offset cams 222, then cam follower 224 together changes the position in the horizontal direction with transferring elements 215B～215D, and the recess 215BA～215DA of transferring elements 215B～215D or the side among recess 215BB～215DB are positioned at the top of transfer roll 13B～13D selectively.In transferring elements 215B～215D, be formed with recess 215BA～215DA and recess 215BB～215DB in different position up and down.In addition, transfer roll 13B～13D is applied to the top.Therefore, the upper-lower position of transfer roll 13B～13D is by transferring elements 215B～215D regulation, rotation by second offset cam 212, be positioned at the top of transfer roll 13B～13DA according to recess 215BA～215DA or recess 215BB～215DB, change the upper-lower position of transfer roll 13B～13D, transfer roll 13B～13D is toward or away from as the photosensitive drums 101B～101D of coloured image with image carrier.

First offset cam 211 (monochrome image is with connecing from parts) and first offset cam 221 (coloured image is with connecing from parts) are the center with rotating shaft 213,223, rotate integratedly with second offset cam 212,222.Rotating shaft 213,223 is configured in the medial surface near the upper side range of the mobile route of the ring-type of intermediate transfer belt 11.First offset cam 211,221 is by its rotation, and in the upper side range of the mobile route of intermediate transfer belt 11, its side face contacts with the medial surface of intermediate transfer belt 11 selectively.Therefore, moving of the above-below direction of transfer roll 13A～13D that first offset cam 211,221 causes according to the rotation by second offset cam 212,222 contacts side face selectively with the medial surface of intermediate transfer belt 11.

Fig. 3 is the synoptic diagram of the mobile route of the intermediate transfer belt in the above-mentioned image processing system of expression.When the image that Fig. 3 (A) presentation video forms the intermediate transfer belt 11 in the device 100 forms the action standby as first path of mobile route.When image forms the action standby, use in the moving-member 210 at monochrome image, contact apart from rotating shaft 213 part farthest on the side face of cam follower 214 and second offset cam 212, the recess 215AA of transferring elements 215A upside is positioned at the top of transfer roll 13A, and transfer member 13A leaves photosensitive drums 101A and intermediate transfer belt 11.Meanwhile, on the side face of first offset cam 211 of parts, be positioned at the vertical top of rotating shaft 213 with connecing, contact, intermediate transfer belt 11 is lifted upward with the medial surface of intermediate transfer belt 11 apart from rotating shaft 213 part farthest as monochrome image.

In addition, when image forms the action standby, use in the moving-member 220 at coloured image, contact apart from rotating shaft 223 part farthest on the side face of cam follower 224 and second offset cam 222, transferring elements 215B～recess 215BA～the 215DA of 215D upside is positioned at the top of transfer roll 13B～13D, and transfer roll 13B～13D leaves photosensitive drums 101B～101D and intermediate transfer belt 11.Meanwhile, on the side face of first offset cam 221 of parts, be positioned at the vertical top of rotating shaft 223 with connecing, contact, intermediate transfer belt 11 is lifted upward with the medial surface of intermediate transfer belt 11 apart from rotating shaft 223 part farthest as coloured image.

Thus, when image forms the action standby, intermediate transfer belt 11 is carried upward by first offset cam 211,221 in the upper side range of mobile route, concerning the downside scope of mobile route, because transfer roll 13A～13D leaves the top, so intermediate transfer belt 11 is in the downside scope of mobile route, be the level of state during till contacting to side face behind the side face that has left driven voller 11B with driven roller 11A, intermediate transfer belt 11 do not contact photosensitive drums 101A～101D and transfer roll 13A～13D any one.

When the monochrome image that Fig. 3 (B) presentation video forms the intermediate transfer belt 11 in the device 100 forms as the Third Road footpath of mobile route.When monochrome image forms, use in the moving-member 210 at monochrome image, the side face of cam follower 214 and second offset cam 212 contacts apart from rotating shaft 213 nearest parts, the recess 215AB of transferring elements 215A downside is positioned at the top of transfer roll 13A, in fact transfer roll 13A contacts with photosensitive drums 101A across intermediate transfer belt 11 near photosensitive drums 101A.Meanwhile, on the side face of first offset cam 211 of parts, be positioned at the vertical top of rotating shaft 213 with connecing, leave from the medial surface of middle transfer belt 11 apart from rotating shaft 213 nearest parts as monochrome image.

In addition, when monochrome image forms, use in the moving-member 220 at coloured image, contact apart from rotating shaft 223 part farthest on the side face of cam follower 224 and second offset cam 222, transferring elements 215B～recess 215BA～the 215DA of 215D upside is positioned at the top of transfer roll 13B～13D, and transfer roll 13B～13D leaves photosensitive drums 101B～101D and intermediate transfer belt 11.Meanwhile, with connecing the vertical top that on the side face of first offset cam 221 of parts, is positioned at rotating shaft 223, contact, intermediate transfer belt 11 is lifted with the medial surface of intermediate transfer belt 11 apart from rotating shaft 223 part farthest as coloured image.

Thus, when monochrome image forms, in the upper side range of the mobile route of intermediate transfer belt 11, by intermediate transfer belt 11 first offset cam 221 is carried upward, in the downside scope of the mobile route of intermediate transfer belt 11, when intermediate transfer belt 11 contacted with photosensitive drums 101A across transfer roll 13A, transfer roll 13B～13D left intermediate transfer belt 11 upward.Therefore, intermediate transfer belt 11 in case leave the side face of driven voller 11B, does not contact photosensitive drums 101B～101D and transfer roll 13B～13D in the downside scope of mobile route, and, contact with the side face of driven roller 11A with after the side face of photosensitive drums 101A and transfer roll 13A contacts.

When the full-color image that Fig. 3 (C) presentation video forms the intermediate transfer belt 11 in the device 100 forms as second path of mobile route.When full-color image forms, use in the moving-member 210 at monochrome image, contact apart from rotating shaft 213 nearest parts on the side face of cam follower 214 and second offset cam 212, the recess 215AB of transferring elements 215A downside is positioned at the top of transfer roll 13A, in fact transfer roll 13A contacts with photosensitive drums 101A across intermediate transfer belt 11 near photosensitive drums 101A.Meanwhile, on the side face of first offset cam 211 of parts, be positioned at the vertical top of rotating shaft 213 with connecing, leave from the medial surface of middle transfer belt 11 apart from rotating shaft 213 nearest parts as monochrome image.

In addition, when full-color image forms, use in the moving-member 220 at coloured image, contact apart from rotating shaft 223 nearest parts on the side face of cam follower 224 and second offset cam 222, transferring elements 215B～recess 215BB～the 215DB of 215D downside is positioned at the top of transfer roll 13B～13D, in fact transfer roll 13B～13D clips intermediate transfer belt 11 and contacts with photosensitive drums 101A near photosensitive drums 101A.Meanwhile, on the side face of first offset cam 221 of parts, be positioned at the vertical top of rotating shaft 223 with connecing, leave from the medial surface of middle transfer belt 11 apart from rotating shaft 223 nearest parts as coloured image.

Thus, when full-color image forms, in the upper side range of the mobile route of intermediate transfer belt 11, before intermediate transfer belt 11 leaves on the side face that arrives driven voller 11B behind the side face of driven roller 11A, do not contact any one in first offset cam 211,221, intermediate transfer belt 11 is along moving horizontally.In addition, in the downside scope of the mobile route of intermediate transfer belt 11, intermediate transfer belt 11 contacts with all photosensitive drums 101A～101D by transfer roll 13A～13D.Therefore, intermediate transfer belt 11 in case leave the side face of driven voller 11B, after the side face of photosensitive drums 101A～101D and transfer roll 13A～13D contacts, contacts with the side face of driven roller 11A in the downside scope of mobile route.

As mentioned above, in image processing system 100, according to first offset cam 211,221 of the content that forms action corresponding to image and the rotation status of second offset cam 212,222, the mobile route of intermediate transfer belt 11 changes in first～Third Road footpath selectively.Intermediate transfer belt 11 is flexible hardly on moving direction, so first～Third Road footpath any one in, the total length of the mobile route of intermediate transfer belt 11 is always kept necessarily, decides the shape of first offset cam 211,221 and the allocation position of rotating shaft 213,223 like this.

Fig. 4 is transfer member travel mechanism that possesses in the image processing system of expression second embodiment of the present invention and the synoptic diagram of being with the structure that connects the structure of disembarking.Intermediate transfer belt 11 is erected between driven roller 11A and the driven voller 11B, is formed with the mobile route of the ring-type that comprises the scope that roughly is level up and down.Photosensitive drums 101A～101D of image formation position PA～PD is configured in the below of intermediate transfer belt 11.Photosensitive drums 101A～101D arranges along the downside scope of the mobile route of intermediate transfer belt 11 and is provided with, and the outer peripheral face of intermediate transfer belt 11 is relative with photosensitive drums 101A～101D in the downside scope of mobile route.11A rotates in the direction of arrow A by driven roller, and intermediate transfer belt 11 moves in the downside scope of mobile route in the direction of arrow B.

Inboard at the mobile route of the ring-type of intermediate transfer belt 11 disposes image and forms transfer roll 13A～13D that position PA～PD comprises.Transfer roll 13A～13D clips intermediate transfer belt 11 respectively, with the relative position of each photosensitive drums 101A～101D, (Y-Y direction) moves and to be supported by axle freely along the vertical direction.Therefore, transfer roll 13A～13D can be toward or away from photosensitive drums 101A～101D.Transfer roll 13A～13D is applied to the top with the elastic force of regulation.

In the inboard of the mobile route of the ring-type of intermediate transfer belt 11, dispose offset cam 212,222, as the cam follower 214,224 and the transferring elements 215A～215D of transfer member of the present invention travel mechanism, and tension part 230.Cam follower 214 and transferring elements 215A constitute monochrome image of the present invention moving-member 210, and cam follower 224 and transferring elements 215B～215D constitute coloured image of the present invention moving-member 220.Offset cam 212 is the center rotation with rotating shaft 213.Offset cam 222 is the center rotation with rotating shaft 223.The shaft parallel ground configuration of rotating shaft 213,223 and driven roller 11A and driven voller 11B.

Tension part 230 by end with an axle backing roll 232, be that lever 231 formations are freely shaken at the center in the other end with rotating shaft 233 simultaneously.At the pars intermedia of lever 231, on cam follower 224, block volute spring (being equivalent to elastomeric element of the present invention) 234 cards that end an end and end the other end.Therefore, lever 231 ends cam follower across volute spring 234 cards.The side face of roller 232 contacts with the inner peripheral surface of intermediate transfer belt 11 in the upper side range of the mobile route of intermediate transfer belt 11.

With in the moving-member 210, cam follower 214 along continuous straight runs (X-X direction) freely move at monochrome image, and the contact site of cam follower 214 contacts with the side face of offset cam 212 in the rotary angle position of the horizontal direction of offset cam 212.Cam follower 214 is applied to offset cam 212 sides by the elastic force of not shown elastomeric element.Transferring elements 215A moves up at upper and lower and is supported on freely on the cam follower 214, and the elastic force by spring 216A is applied to the below.On transferring elements 215A,, be formed with from the top and support recess 215AA and the recess 215AB that black image forms the transfer roll 13A that comprises the PA of position at the diverse location of above-below direction and horizontal direction.

Rotation by offset cam 212, the distance of 212 side face from rotating shaft 213 to offset cam (radius length of anglec of rotation cam ring follower 214 sides of the horizontal direction of offset cam 212) is in case change, then cam follower 214 together changes the position in the horizontal direction with transferring elements 215A, and the recess 215AA of transferring elements 215A or the side among the recess 215AB are positioned at the top of transfer roll 13A selectively.In transferring elements 215A, be formed with recess 215AA and recess 215AB in different position up and down.In addition, transfer roll 13A is by afterburning upward.Therefore, the upper-lower position of transfer roll 13A is stipulated by transferring elements 215A, rotation by offset cam 212, be positioned at the top of transfer roll 13A according to recess 215AA or recess 215AB, change the upper-lower position of transfer roll 13A, transfer roll 13A is toward or away from as the photosensitive drums 101A of monochrome image with image carrier.

With in the moving-member 220, cam follower 224 freely moves in the horizontal direction at coloured image, and the contact site of cam follower 224 contacts with the side face of offset cam 222 in the rotary angle position of the horizontal direction of offset cam 222.Cam follower 224 is applied in offset cam 222 sides by the elastic force of not shown elastomeric element.Transferring elements 215B～215D moves up at upper and lower and is supported on freely on the cam follower 224, and the elastic force by spring 216B～216D is applied in the below.On transferring elements 215B～215D, at the diverse location of above-below direction and horizontal direction, be formed with recess 215BA, the 215BB, 215BC～215DA, 215DB, the 215DC that support the transfer roll 13B～13D that comprises each blue or green, pinkish red and yellow color image formation position PB～PD from the top.

Rotation by offset cam 222, the distance of 222 side face from rotating shaft 223 to offset cam (radius length of offset cam 212 anglec of rotation cam ring follower 224 sides in the horizontal direction) is in case change, then cam follower 224 together changes the position in the horizontal direction with transferring elements 215B～215D, and the side among recess 215BA～215DA of transferring elements 215B～215D, recess 215BB～215DB or the recess 215BC～215DC is positioned at the top of transfer roll 13B～D selectively.In transferring elements 215B～215D, be formed with recess 215BA～215DA, recess 215BC～215DC and recess 215BB～215DB in different position up and down.In addition, transfer roll 13B～13D is by afterburning upward.Therefore, the upper-lower position of transfer roll 13B～13D is by transferring elements 215B～215D regulation, rotation by offset cam 212, be positioned at the top of transfer roll 13B～DA along with recess 215BA～215DA or recess 215BC～215DC or recess 215BB～215DB, change the upper-lower position of transfer roll 13B～13D, transfer roll 13B～13D is toward or away from the photosensitive drums 101B～101D of the image carrier of using as coloured image.

The variation of the horizontal direction of the cam follower 224 that is caused by the rotation of offset cam 222 is delivered to lever 231 across volute spring 234, and offset cam 222 is in case rotation, and lever 231 is that the center is shaken with rotating shaft 233 just.Lever 231 is in case be that the center is shaken with rotating shaft 233, and the upper-lower position of roller 232 just changes along with the difference of the waving angle of lever 231.The side face of roller 232 contacts with the inner peripheral surface of intermediate transfer belt 11 in the upper side range of the mobile route of intermediate transfer belt 11, so in a single day the upper-lower position of roller 232 changes, the mobile route of intermediate transfer belt 11 just is out of shape.

Therefore, rotation by offset cam 222, in case cam follower 224 changes the position in the horizontal direction with transferring elements 215B～215D, then be positioned at the top of transfer roll 13B～13D according to the either party among recess 215BA～215DA, recess 215BC～215DC or the recess 215BB～215DB, the waving angle of lever 231 changes, the mobile route distortion of intermediate transfer belt 11.

Fig. 5 is the synoptic diagram of the mobile route of the intermediate transfer belt in the above-mentioned image processing system of expression.When the image that Fig. 5 (A) presentation video forms the intermediate transfer belt 11 in the device 100 forms the action standby as first path of mobile route.When image forms the action standby, use in the moving-member 210 at monochrome image, contact apart from rotating shaft 213 part (part that radius is the longest) farthest on the side face of cam follower 214 and offset cam 212, the recess 215AA of transferring elements 215A upside is positioned at the top of transfer roll 13A, and transfer member 13A leaves photosensitive drums 101A and intermediate transfer belt 11.

In addition, when image forms the action standby, use in the moving-member 220 at coloured image, contact apart from rotating shaft 223 part (part that radius is the longest) farthest on the side face of cam follower 224 and offset cam 222, cam follower 224 is positioned at the rightmost side of the moving range of horizontal direction, so the transferring elements 215B～recess 215BA～215DA of 215D upside is positioned at the top of transfer roll 13B～13D, transfer member 13B～13D leaves photosensitive drums 101B～101D and intermediate transfer belt 11.Meanwhile, the lever 231 of tension part 230 reaches minimum with the pitch angle of vertical direction, and roller 232 is positioned at the top, and the part of the upper side range of the mobile route of intermediate transfer belt 11 is projected into the top.

Thus, when image forms the action standby, intermediate transfer belt 11 roller 232 by tension part 230 in the upper side range of mobile route is mentioned the top, concerning the downside scope of mobile route, because transfer roll 13A～13D leaves the top, so intermediate transfer belt 11 is in the downside scope of mobile route, be the level of state during till contacting to the side face with driven roller 11A after the side face that leaves driven voller 11B, intermediate transfer belt 11 does not contact with the either party of transfer roll 13A～13D with photosensitive drums 101A～101D.

When the monochrome image that Fig. 5 (B) presentation video forms the intermediate transfer belt 11 in the device 100 forms as the Third Road footpath of mobile route.When monochrome image forms, use in the moving-member 210 at monochrome image, contact apart from rotating shaft 213 nearest parts (part that radius is the shortest) on the side face of cam follower 214 and offset cam 212, the recess 215AB of transferring elements 215A downside is positioned at the top of transfer roll 13A, in fact transfer member 13A contacts with photosensitive drums 101A across intermediate transfer belt 11 near photosensitive drums 101A.

In addition, when monochrome image forms, use in the moving-member 220 at coloured image, contact for middle part (part of the middle radius of maximum radius and least radius) with the distance of rotating shaft 223 on the side face of cam follower 224 and offset cam 222, transferring elements 215B～recess 215BC～the 215DC of 215D upside is positioned at the top of transfer roll 13B～13D, and transfer member 13B～13D leaves photosensitive drums 101B～101D and intermediate transfer belt 11.Meanwhile, compare when forming the action standby with image, the lever 231 of tension part 230 increases with the pitch angle of vertical direction, and roller 232 is positioned at the below.Its result, the part of the upper side range of the mobile route of intermediate transfer belt 11 compare when forming the action standby with image, and be just outstanding upward slightly.

Therefore, when monochrome image forms, in the upper side range of the mobile route of intermediate transfer belt 11, intermediate transfer belt 11 is carried upward a little by the roller 232 of tension part 230, in the downside scope of the mobile route of intermediate transfer belt 11, when intermediate transfer belt 11 contacted with photosensitive drums 101A across transfer roll 13A, transfer roll 13B～13D left intermediate transfer belt 11 upward.Therefore, intermediate transfer belt 11 in case leave the side face of driven voller 11B, does not contact photosensitive drums 101B～101D and transfer roll 13B～13D in the downside scope of mobile route, after the side face of photosensitive drums 101A and transfer roll 13A contacts, contact with the side face of driven roller 11A.

When the full-color image that Fig. 5 (C) presentation video forms the intermediate transfer belt 11 in the device 100 forms as second path of mobile route.When full-color image forms, use in the moving-member 210 at monochrome image, contact apart from rotating shaft 213 nearest parts (part that radius is the shortest) on the side face of cam follower 214 and offset cam 212, the recess 215AB of transferring elements 215A downside is positioned at the top of transfer roll 13A, in fact transfer member 13A contacts with photosensitive drums 101A across intermediate transfer belt 11 near photosensitive drums 101A.

In addition, when full-color image forms, use in the moving-member 220 at coloured image, contact apart from rotating shaft 223 nearest parts on the side face of cam follower 224 and offset cam 222, transferring elements 215B～recess 215BB～the 215DB of 215D downside is positioned at the top of transfer roll 13B～13D, in fact transfer member 13B～13D contacts with photosensitive drums 101A across intermediate transfer belt 11 near photosensitive drums 101A.Meanwhile, the lever of tension part 230 231 becomes maximum with the pitch angle of vertical direction, and roller 232 is positioned at below.Its result, the part of the upper side range of the mobile route of intermediate transfer belt 11 are not outstanding upward.

Thus, when full-color image formed, in the upper side range of the mobile route of intermediate transfer belt 11, intermediate transfer belt 11 arrived before the side face of driven voller 11B after leaving the side face of driven roller 11A, roughly along moving horizontally.In addition, in the downside scope of the mobile route of intermediate transfer belt 11, intermediate transfer belt 11 contacts with all photosensitive drums 101A～101D by transfer roll 13A～13D.Therefore, intermediate transfer belt 11 in case leave the side face of driven voller 11B, after the side face of photosensitive drums 101A～101D and transfer roll 13A～13D contacts, contacts with the side face of driven roller 11A in the downside scope of mobile route.

As mentioned above, in image processing system 100, according to the rotation status that forms the offset cam 212,222 of the content of moving corresponding to image, the mobile route of intermediate transfer belt 11 changes in first～Third Road footpath selectively.Intermediate transfer belt 11 is flexible hardly on moving direction, so in the either party in first～Third Road footpath, the total length of the mobile route of intermediate transfer belt 11 is always kept necessarily, decides the shape of offset cam 222, the shape and the allocation position of tension part 230 like this.

Fig. 6 is the side view of the roller that comprises in the tension part of above-mentioned image processing system.Rotating shaft 232A is outstanding from the axial both ends of roller 232, and the distolateral of a pair of lever 231 supported by axle in the both ends of this rotating shaft 232A.A pair of lever 231 is supported by rotating shaft 233.Make the axial length of the roller 232 that side face contacts with the part of the medial surface of intermediate transfer belt 11 be substantially equal to the width of intermediate transfer belt 11.In addition, the diameter DC of the axial central portion of roller 232 is bigger than the diameter DE at both ends, and is symmetric shape with respect to axial centre line L m.

In on the whole width that can contact force be acted on intermediate transfer belt 11, rotate that the both ends from Width (direction of principal axis of roller 232) are used on the intermediate transfer belt 11 towards the masterpiece of central portion when mobile from the side face of roller 232.Thus, intermediate transfer belt 11 is under the situation that high speed rotating moves, and intermediate transfer belt 11 can not wriggled, and intermediate transfer belt 11 is stably rotated move.

Fig. 7 is the structured flowchart of the control part of the above-mentioned image processing system of expression.The control part 300 of image processing system 100 constitutes like this: input and output devices such as interface 304, video memory 305, paper supply delivery section load device 306, image forming part load device 307, temperature sensor 308, motor driver 309 and display part 310 are connected on the CPU301 that possesses ROM302 and RAM303.CPU301 is according to being pre-written into program among the ROM302, blanket these input and output devices of control, with the data storage of wherein input and output in the memory block of the regulation of RAM303.CPU301 is connected on the outside image output device such as personal computer across interface 304, will be from the image data storage of interface 304 inputs video memory 305.

Comprise in the paper supply delivery section load device 306 and from paper supply tray 16 or manual pallet 17, one by one supply with and carry motor, clutch coupling and the sensor that paper is used.In the image forming part load device 307, comprise by image formation position PA～PD and fixing device 15 on paper, forming motor, clutch coupling and the sensor that image is used.Temperature sensor 308 detects the temperature of the warm-up mill 15A in the fixing device 15.Motor driver 309 drives supplies with the rotating shaft 213 that is configured in the

intermediate transfer belt

11 and 223 motor M1 and M2 respectively with revolving force.Display part 310 is according to the video data of supplying with from CPU301, and operating state etc. is presented on the display.

Fig. 8 and Fig. 9 are the process flow diagrams of handling procedure of the control part of the above-mentioned image processing system of expression, when Fig. 8 represents to switch on beginning to the handling procedure of device, the handling procedure when Fig. 9 represents to have imported image from the image output device of outside and forms request.

As shown in Figure 8, in case energized in image processing system 100, CPU301 just detects the state (S1) of intermediate transfer belt 11, and driving motor M1 and M2 are so that the mobile route of intermediate transfer belt 11 is second path (S2) shown in Fig. 3 (C) or Fig. 5 (C).Secondly, CPU301 judges whether there is paper trapping phenomena (S3) in the paper transport path, exists in the paper transport path under the situation of paper trapping phenomena, impels the demonstration (S4) that paper is removed by display part 310.If paper is not trapped in the paper transport path, then CPU301 carries out thermal pretreatment and initialization process (S5, S6).Thermal pretreatment is to make warm-up mill 15A in the fixing device 15 rise to the processing of design temperature.Initialization process comprises the initialization etc. of suitableization, each sensor and timer of pre-charged and concentration of developer of the removing of residual electric potential, the developer in developing cell 102A～102D of photosensitive drums 101A～101D.

If thermal pretreatment and initialization process finish, then CPU301 shows the information (S7) that is image formation action possibility state by display part 310, start the timer of the memory block MA1 that is assigned to RAM303, judge the input (S8, S9) that has or not image to form request.If there is not input picture to form request, and timer has carried out the timing (S10) of stipulated time, then CPU301 is reduced to the energy efficiency temperature lower than design temperature (S11) with the control temperature of fixing device 15, by motor driver 309 driving motor M1, M2, make the mobile route of intermediate transfer belt 11 be first path (S12) shown in Fig. 3 (A) or Fig. 5 (A).

By above processing, CPU301 is under the state in second path at the mobile route that makes intermediate transfer belt 11, carry out thermal pretreatment and initialization process, thermal pretreatment and initialization process finish the back to be become under the possible state at image, input picture does not form request if passed through the stipulated time, then make image processing system 100 be energy saver mode, can reduce power consumption.At this moment, CPU301 makes the mobile route of intermediate transfer belt 11 be first state, so under the state that does not carry out image formation action, intermediate transfer belt 11 does not contact photosensitive drums 101A～101D and transfer roll 13A～13D, the deterioration of the circumferential surface sections of the local deformation of intermediate transfer belt 11 and photosensitive drums 101A～101D can not take place.

In S9 or S13 shown in Figure 8, form request in case imported image from the image output device of outside, then whether CPU301 is set at the judgement (S21) of energy saver mode, be set under the situation of energy saver mode, make the "on" position of image processing system 100 return common state, the control temperature of fixing device 15 is changed to design temperature (S22).In a single day fixing device 15 reaches design temperature (s23), then CPU301 carries out whether the mobile route of intermediate transfer belt 11 is the judgements (S24) in first path, mobile route at intermediate transfer belt 11 is under the situation in first path, and the mobile route of intermediate transfer belt 11 is changed to second path (S25).

Secondly, it is under the situation of full-color image request that CPU301 forms request at the image of being imported, and making the mobile route of intermediate transfer belt 11 still is second path, carries out full-color image and forms (S26 → S27 → S30).It is under the situation of monochrome image request that CPU301 forms request at the image imported, the mobile route of intermediate transfer belt 11 is changed to the Third Road footpath after, carry out monochrome image and form (S26 → S28～S30).

By above processing, form request if imported the image of full-color image, then CPU301 makes the mobile route of intermediate transfer belt 11 be second path shown in Fig. 3 (C) or Fig. 5 (C), make intermediate transfer belt 11 all photosensitive drums 101A～101D of contact and transfer roll 13A～13D, carry out full-color image and form.In addition, form request if imported the image of monochrome image, then CPU301 makes the mobile route of intermediate transfer belt 11 be the Third Road footpath shown in Fig. 3 (B) or Fig. 5 (B), makes 11 of intermediate transfer belts contact photosensitive drums 101A and transfer roll 13A, carries out monochrome image and forms.When monochrome image forms, obsolete photosensitive drums 101B～101D does not contact intermediate transfer belt 11 with transfer roll 13B～13D in the action because image forms, so can prevent the mixing of the toner of the deterioration of photosensitive drums 101B～101D and transfer roll 13B～13D and the different colours among developing apparatus 102A～102D.Therefore, the mobile route of intermediate transfer belt 11 can be adjusted into the state that is adapted to multiple image formation content respectively.

Figure 10 (A) and Figure 10 (B) are the front elevation and the side view of first offset cam of above-mentioned image processing system.In addition, though Figure 10 represents first offset cam 211, second offset cam 212, rotating shaft 213 and motor M1, first offset cam 221, second offset cam 222, rotating shaft 223 and motor M2 constitute too.

Make the direction of principal axis length of first offset cam 211 that side face contacts with the part of the medial surface of intermediate transfer belt 11 be substantially equal to the width of intermediate transfer belt 11.In addition, the diameter DC of the axial central portion of offset cam 211 is bigger than the diameter DE at both ends, and is symmetric shape with respect to axial centre line L m.

Contact force is acted on the whole width of intermediate transfer belt 11 from the side face of first offset cam 211, rotate simultaneously when mobile from Width (first offset cam 211 axially) both ends and be used on the intermediate transfer belt 11 to the masterpiece of central portion.Thus, under the situation that intermediate transfer belt 11 high speed rotating move, intermediate transfer belt 11 can not wriggled yet, and intermediate transfer belt 11 is stably rotated move.

Rotating shaft 213 is outstanding from the direction of principal axis both ends of first offset cam 211, and second offset cam 212 is fixed on the both ends of this rotating shaft 213.The rear side of rotating shaft 213 connects offset cam 212, connects the rotating shaft of motor M1.By the driving of motor M1, first offset cam 211 and second offset cam 212 are rotation integratedly.Second offset cam 212 is arranged on the front face side and rear side two sides of intermediate transfer belt 11, so can transfer roll 13A stably be moved across above-mentioned cam follower 214 and transferring elements 215A.

In addition, two places of upside and downside of the mobile route of first offset cam 211,221 ring-type that also can form at intermediate transfer belt 11 always contact with the inner peripheral surface of intermediate transfer belt 11.

Claims

1. image processing system is characterized in that possessing:

At a plurality of image carriers that in the specialized range of the moving direction of described endless belt, are set up in parallel;

Be configured in the inboard of described mobile route, across relative with the described a plurality of image carriers respectively a plurality of transfer members of the part of described endless belt;

Make each described a plurality of transfer members be toward or away from the transfer member travel mechanism of described a plurality of image carriers respectively; With

Follow the action of described transfer member travel mechanism, make described endless belt connect the structure of disembarking with the band that described a plurality of image carriers contact respectively or leave,

Described transfer member travel mechanism and described band connect the inboard that the structure of disembarking is configured in described mobile route,

Described band connects the structure of disembarking and comprises being rotated freely and supporting first offset cam that its side face contacts with the inner peripheral surface of described endless belt.

2. image processing system according to claim 1 is characterized in that:

Described a plurality of image carrier forms the image carrier formation that the monochrome image of the toner picture of black is used when forming the image carrier that a plurality of coloured images of the trichromatic toner picture that mixes of losing lustre use when forming full-color image respectively and forming monochrome image,

Described transfer member travel mechanism comprises the coloured image moving-member that all relative transfer members of image carrier of using with described coloured image are integrally moved,

Described band connects the structure of disembarking and comprises according to the action of described coloured image with moving-member, and the coloured image that all image carriers that described endless belt is used with respect to described coloured image contact or leave is with connecing from parts.

3. image processing system according to claim 2 is characterized in that:

Described transfer member travel mechanism also comprises the monochrome image moving-member that the relative transfer member of image carrier used with described monochrome image is moved,

Described band connects the structure of disembarking and also comprises according to the action of described monochrome image with moving-member, and the monochrome image that the image carrier that described endless belt is used with respect to described monochrome image contacts or leaves is with connecing from parts.

4. image processing system according to claim 1 is characterized in that:

Described transfer member travel mechanism comprises second offset cam with the configuration of the coaxial shape of described first offset cam ground; Be engaged in the cam follower that changes the position on the side face of described second offset cam; With change in location, make described transfer member be toward or away from the transferring elements of described image carrier along with described cam follower.

5. image processing system according to claim 1 is characterized in that:

Contact with the inner peripheral surface of described endless belt beyond the described specialized range of the side face of described first offset cam in described mobile route.

6. image processing system according to claim 1 is characterized in that:

The side face of described first offset cam contacts with roughly whole zone at the Width of described endless belt.

7. image processing system according to claim 6 is characterized in that:

Described first offset cam is bigger than the diameter at both ends at the diameter of axial central portion.

8. image processing system according to claim 4 is characterized in that:

Described cam follower possesses: make each transfer member near the image carrier and first maintaining part that keeps what the orientation of described a plurality of transfer members was arranged; With second maintaining part of leaving from image carrier and keeping, follow the rotation of described second offset cam simultaneously, along the orientation change position of described a plurality of transfer members.

9. image processing system according to claim 1 is characterized in that:

Described endless belt is the intermediate transfer belt of the toner picture that forms on the described a plurality of image carriers of transfer printing successively.

10. image processing system is characterized in that possessing:

The image carrier of using at a plurality of coloured images that in the specialized range of the moving direction of described endless belt, are set up in parallel, comprise the trichromatic toner picture that forming respectively when forming full-color image loses lustre mixes and form a plurality of image carriers of the image carrier that the monochrome image of the toner picture of black uses when forming monochrome image;

Make described a plurality of transfer member be toward or away from the transfer member travel mechanism of described a plurality of image carriers respectively; With

Form the content of action according to image, first path in the path when making the mobile route of described endless belt become the image that leaves from all described a plurality of image carriers as described endless belt to form the action standby, contact as the described image carrier of described endless belt and all full-color image formation the time the path second path with contact as the image carrier of described endless belt with monochrome image formation usefulness, arbitrary path the Third Road footpath in the path the when monochrome image that the image carrier of using from full-color image leaves forms

Described band connects the structure of disembarking and comprises being rotated freely and supporting, according to the switching in described first path, second path or Third Road footpath, first offset cam that its side face contacts with the inner peripheral surface of described endless belt selectively.

11. image processing system according to claim 10 is characterized in that:

Described band connects the structure of disembarking and respectively the girth of described first～Third Road described endless belt is directly kept necessarily.

12. an image processing system is characterized in that possessing:

At a plurality of image carriers that are set up in parallel in the specialized range of the moving direction of described endless belt, described a plurality of image carriers form the image carrier that the monochrome image of the toner picture of black is used when comprising the image carrier that the coloured image of the trichromatic toner picture that forming respectively when forming full-color image loses lustre mixes is used and forming monochrome image;

Be configured in the inboard of described mobile route, across the part of described endless belt respectively with described a plurality of image carriers with the relative a plurality of transfer members of the mode that freely contacts or leave;

Being configured in the inboard of described mobile route, is the center with the turning axle of the rotating shaft that is parallel to described driven roller and driven voller, first and second offset cams that are rotated with the anglec of rotation that forms the content of action based on image;

The coloured image moving-member, this coloured image is configured in the inboard of described mobile route with moving-member, comprise along with the rotation of described first offset cam first cam follower that on the between centers direction of described driven roller and driven voller, changes the position, with by this first cam follower with the direction of described between centers direction quadrature on change freely that ground, position supports and each comfortable described between centers direction and have three first transferring elements of a plurality of recesses with the diverse location of the direction of described between centers direction quadrature, the position change of described three first transferring elements that the position change of utilization and described first cam follower accompanies, three transfer members in described a plurality of transfer member are supported on respectively in described a plurality of recess selectively, the recess of the same position in described three first transferring elements, convert the change in radius of the anglec of rotation of the regulation of described first offset cam connect the position change from direction of described transfer member to, the relative transfer member of using with described coloured image of image carrier is moved to contact the direction of leaving with image carrier with respect to described image carrier;

The monochrome image moving-member, this monochrome image is configured in the inboard of described mobile route with moving-member, comprise along with the rotation of described second offset cam second cam follower that on the between centers direction of described driven roller and driven voller, changes the position, with by this second cam follower with the direction of described between centers direction quadrature on change freely that ground, position supports and have second transferring elements of a plurality of recesses in described between centers direction with the diverse location of the direction of described between centers direction quadrature, the position change of described second transferring elements that the position change of utilization and described second cam follower accompanies, make transfer member beyond described three transfer members in described a plurality of transfer member be supported on any of described a plurality of recesses selectively, convert the change in radius of the anglec of rotation of the regulation of described second offset cam connect the position change from direction of described transfer member to, the relative transfer member of using with described monochrome image of image carrier is moved to contact the direction of leaving with image carrier with respect to described image carrier; With

End with the moving-member card with described coloured image,, make the tension part of the mobile route distortion of described endless belt with the action interlock of described coloured image with moving-member,

Described coloured image with moving-member by with image form action the corresponding described offset cam of content rotation and change any of kind of position, position to 3 selectively,

Described tension part, an end contacts with the inner peripheral surface of described endless belt, shake simultaneously supported freely in the other end, and pars intermedia ends with the moving-member card across elastomeric element and described coloured image, according to the 3 kind positions of described coloured image with moving-member, make the angle with horizontal level be changed to for 3 stages, in this angle when being maximum, make the mobile route of described endless belt be respectively during for the centre and when minimum: the path the when image that described endless belt leaves from all described a plurality of image carriers and all described a plurality of transfer members forms the action standby, path when described endless belt forms with the full-color image that all described a plurality of image carriers contact with described a plurality of transfer members, the path when monochrome image that image carrier that contacts with transfer member with image carrier that described endless belt and monochrome image are used and use from full-color image and transfer member leave forms any.

13. image processing system according to claim 12 is characterized in that:

14. image processing system according to claim 12 is characterized in that:

Described tension part is configured in the inboard of described mobile route.

15. image processing system according to claim 12 is characterized in that:

Described coloured image is included in the contact site that the rotary angle position of the regulation of described first offset cam contacts with the side face of described first offset cam with moving-member,

Described monochrome image is included in the contact site that the rotary angle position of the regulation of described second offset cam contacts with the side face of described second offset cam with moving-member.

16. image processing system according to claim 12 is characterized in that:

Side face contacts with the inner peripheral surface of described endless belt described tension part and the diameter of the central portion roller bigger than the diameter at both ends on direction of principal axis by supporting with the turning axle of the shaft parallel of described driven roller and driven voller.