CN1199877A - Image forming device - Google Patents

Image forming device Download PDF

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Publication number
CN1199877A
CN1199877A CN98105962A CN98105962A CN1199877A CN 1199877 A CN1199877 A CN 1199877A CN 98105962 A CN98105962 A CN 98105962A CN 98105962 A CN98105962 A CN 98105962A CN 1199877 A CN1199877 A CN 1199877A
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CN
China
Prior art keywords
intermediate transfer
mentioned
transfer body
transfer printing
china ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN98105962A
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Chinese (zh)
Other versions
CN1148612C (en
Inventor
行方伸一
俞英雄
内田智
高桥充
川越克哉
小野博司
本桥俊昭
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Ricoh Co Ltd
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Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from JP9098067A external-priority patent/JPH10274892A/en
Priority claimed from JP09806497A external-priority patent/JP3594279B2/en
Priority claimed from JP09806597A external-priority patent/JP3611270B2/en
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of CN1199877A publication Critical patent/CN1199877A/en
Application granted granted Critical
Publication of CN1148612C publication Critical patent/CN1148612C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/0131—Details of unit for transferring a pattern to a second base
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
    • G03G2215/0174—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member plural rotations of recording member to produce multicoloured copy
    • G03G2215/0177—Rotating set of developing units

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Color Electrophotography (AREA)

Abstract

The invention relates to an image forming device which utilizes an intermediate transfer body, which is provided with an intermediate transfer body, a primary transfer charge endowing device and an intermediate transfer body discharge system, and the surface charge potential of the discharge charge is proportional to the surface charge potential of the intermediate transfer body. For example, a control portion is arranged to switch the discharge condition of a charger with discharge according to the surface charge potential of the intermediate transfer body, and to switch the direct current of a power supply for discharging which is applied on the charger with discharge according to transfer time of ink images, thereby can evenly discharge the intermediate transfer body for the latter ink images transfer printing.

Description

Image processing system
The present invention relates to image processing systems such as duplicating machine, printer, facsimile recorder, in detail, relate to the image processing system that uses the intermediate transfer body.
In the past, this image processing system is provided with the intermediate transfer body of mounting from the China ink picture of image carrier transfer printing, utilizing electrostatic force will be used for above-mentioned image carrier makes China ink invest device as transfer printing at the electric charge that the electric charge of above-mentioned intermediate transfer body invests above-mentioned intermediate transfer body, utilize electrostatic force will be used for making China ink invest device as the secondary charges that the electric charge of transfer printing on the transfer printing material invests this transfer printing material or transfer printing material carrier from this intermediate transfer body, to with China ink as the disappear discharge system of intermediate transfer body of electricity of the surface of the above-mentioned intermediate transfer body of transfer printing on the transfer printing material, above-mentioned image processing system is known.In this image processing system, disappear after China ink looks like to be transferred on the transfer printing material by the surface that makes the intermediate transfer body with intermediate transfer body discharge system, make the surface potential homogenization of intermediate transfer body, remove the attachments such as residual toner that are attached on the intermediate transfer body, to carry out the primary transfer from image carrier toward the intermediate transfer body of back.
But, in above-mentioned image processing system in the past, even the intermediate transfer body is disappeared with above-mentioned intermediate transfer body discharge system, sometimes also can exist the surface potential of intermediate transfer body do not become decide the uneven phenomenon such as residual of current potential, current potential, if there is this electric bad phenomenon that disappears, can bring bad influence to the transfer printing process from image carrier toward the intermediate transfer body of back.
The present inventor studies the electric poor prognostic cause of disappearing of above-mentioned intermediate transfer body, and the surface potential of the intermediate transfer body before the electricity of finding to disappear is very discrete to be the above-mentioned bad main cause of electricity that disappears.
Especially ought carry out the primary transfer of several times, so that with the China ink of all kinds that forms on the image carrier as superimposed above-mentioned intermediate transfer body, then with the superimposed China ink on the intermediate transfer body as the image processing system occasion of primary transfer at the transfer printing material, very discrete with the surface potential of intermediate transfer body that above-mentioned intermediate transfer body discharge system disappears before the electricity, its with superimposed China ink on the intermediate transfer body as number, promptly relevant to the number of times of the primary transfer of middle transfer article.
In addition, in above-mentioned image processing system in the past, since be provided with respectively surface to above-mentioned intermediate transfer body disappear electricity intermediate transfer body discharge system such as corona discharger and remove the cleaning device of intermediate transfer surface attachment, be difficult to so will realize cost degradation.
In above-mentioned image processing system in the past, the transfer printing condition on the transfer printing material time is decided to be usually and makes the substantial middle that becomes the suitable transfer printing scope of institute more than the definite value toward the transfer efficiency of transfer printing material as transfer printing with the China ink of intermediate transfer body.The difference of the setting value of this transfer printing condition and the bound of above-mentioned suitable transfer printing scope and with the China ink of intermediate transfer body as transfer printing the transfer printing tolerance limit on the transfer printing material time corresponding, the big more transfer printing tolerance limit of this difference is big more.
Here, if from image carrier toward the intermediate transfer body primary transfer of China ink picture by after China ink look like to comprise the different part of ink powder adhesion amount, the China ink on this intermediate transfer body can produce dispersing of carried charge as interior.For example, when the China ink on the above-mentioned intermediate transfer body looked like to comprise panchromatic accent portion (ベ portion) and shadow tone portion (Ha one Off ト one Application portion), the carried charge of panchromatic accent portion was littler than shadow tone portion.In addition, if for example coloured image forms the device occasion, the China ink on the intermediate transfer body is littler than the part that only has monochromatic ink powder to adhere to as the carried charge of superimposed part.
Primary transfer portion from image carrier toward intermediate transfer body transfer ink picture by after China ink also can take place sometimes as interior carried charge is discrete because of the discharge of peeling off that produces in abutting connection with downstream side of the above-mentioned primary transfer portion of the surperficial moving direction of this intermediate transfer body.
Like this, discrete if the China ink on the intermediate transfer body takes place as interior carried charge, the mutual different piece of transferring properties can be present in the same China ink picture.If all part transfer printings under identical transfer printing condition that this transferring properties is different are on the transfer printing material, then because can be with the scope stenosis of the transfer printing condition of the above transferring rate transfer ink of institute's definite value picture integral body, so reduce for the transfer printing tolerance limit of China ink picture integral body, can not be stably with China ink as transfer printing on the transfer printing material.
Curve a and curve b represent respectively to have shown to pattern transferring properties for the transfer printing electric current of panchromatic accent portion and shadow tone portion and the relation of transferring rate among Figure 10.The width that symbol A among the figure and B represent is can be with transferring rate scope with the transfer printing electric current of each transfer printing on the transfer printing material more than 80%, and the transfer printing tolerance limit is bigger.But because two transferring properties curves have and depart from, above-mentioned two parts can both be carried out the scope stenosis of the transfer printing electric current of transfer printing with transferring rate more than 80%, and shown in symbol C among the figure, the transfer printing tolerance limit reduces.
The present invention puts forward in view of the existing problem of above-mentioned prior art, and its purpose is, provide a kind of China ink as transfer printing after on the transfer printing material can to middle transfer article homogeneous disappear electricity, carry out the image processing system of China ink in order to the back from image carrier as transfer printing.
Another object of the present invention is, provides a kind of by the electric conductivity brush portion part that can be also used as intermediate transfer body discharge system and intermediate transfer body cleaning device being set, can realizing than the low image processing system of above-mentioned stream oriented device occasion cost is set respectively.
A further object of the present invention is, though provide a kind of China ink from the intermediate transfer body of image carrier transfer printing as interior carried charge take place the discrete reduction that also can suppress this China ink transfer printing tolerance limit on the transfer printing material time as transfer printing, can should the image processing system of China ink picture transfer printing stably on the transfer printing material.
To achieve these goals, the present invention proposes a kind of image processing system, and it comprises: mounting is from the intermediate transfer body of the China ink picture of image carrier transfer printing: will be used for the primary transfer electric charge that electric charge from image carrier toward intermediate transfer body transfer ink picture invests this intermediate transfer body and invest device; Intermediate transfer body discharge system, the electric charge that will disappear invests the intermediate transfer body, with to the surface of China ink as the above-mentioned intermediate transfer body of transfer printing on the transfer printing material being disappeared; It is characterized in that: the above-mentioned electric charge that disappears is directly proportional with the surface potential of intermediate transfer body.
According to image processing system of the present invention, its feature also is: will be formed on China ink on the above-mentioned image carrier as the superimposed transfer printing of several times on above-mentioned intermediate transfer body: as the transfer printing number of times, switch the resulting electric charge that disappears of above-mentioned intermediate transfer body discharge system according to above-mentioned China ink toward the intermediate transfer body.
According to image processing system of the present invention, its feature also is:, switch and invest the electric charge that device invests by above-mentioned primary transfer electric charge as the transfer printing number of times according to above-mentioned China ink toward the intermediate transfer body.
According to image processing system of the present invention, its feature also is: be provided with the secondary transfer printing electric charge that will be used for investing from above-mentioned intermediate transfer body toward the electric charge of transfer printing material transfer ink picture above-mentioned transfer printing material body carrier and invest device; Whether, above-mentioned secondary transfer printing electric charge switches according to above-mentioned intermediate transfer body during charging operations from the resulting electric electric charge that disappears of above-mentioned intermediate transfer body discharge system in the face of investing device.
According to image processing system of the present invention, its feature also is: be provided with the translational speed control device, according to the thickness of transfer printing material, switch the translational speed of intermediate transfer body: the translational speed according to above-mentioned intermediate transfer body is switched from the resulting electric charge that disappears of above-mentioned intermediate transfer body discharge system.
According to image processing system of the present invention, its feature also is: use the corona consumer appliance as above-mentioned intermediate transfer body discharge system, apply the voltage that comprises flip-flop and alternating component; The above-mentioned electric charge that disappears changes the flip-flop size that is applied on the above-mentioned corona consumer appliance.
According to image processing system of the present invention, its feature also is, the intermediate transfer body is one to have first and second layers band at least.
According to image processing system of the present invention, its feature also is, is provided with: electric conductivity brush portion part, this brush portion part with China ink is contacted as the above-mentioned intermediate transfer body of transfer printing after on the above-mentioned transfer printing material; Power supply, this power supply will be applied on the above-mentioned electric conductivity brush portion part with the bias voltage of the surface potential opposite polarity of intermediate transfer body.
According to image processing system of the present invention, its feature also is, use can rotating electric conductivity brush roll as above-mentioned electric conductivity brush portion part.
According to image processing system of the present invention, its feature also is, is provided with the pre-transfer Charging system, makes the black image-tape that is transferred on the preceding above-mentioned intermediate transfer body of above-mentioned transfer printing material.
According to image processing system of the present invention, its feature also is, is provided with control device, and this control device basis is controlled the output of above-mentioned pre-transfer Charging system by the surperficial translational speed of the intermediate transfer body of the charged position of above-mentioned pre-transfer Charging system.
The following describes effect of the present invention.
According to the present invention, also can be even the surface potential of the intermediate transfer body before the electricity that disappears is discrete to the middle transfer article homogeneous electricity that disappears, in order to carry out the back from the China ink of image carrier as transfer printing.
According to the present invention, even because of causing that toward intermediate transfer body transfer printing number of times is different the surface potentials of the intermediate transfer body before the electricity that disappears are discrete, also can be to the middle transfer article homogeneous electricity that disappears, in order to carry out the back from the China ink of image carrier as transfer printing.
According to the present invention, even invest the device subtend and cause that the surface potential of the intermediate transfer body before the electricity that disappears is discrete because of whether the intermediate transfer body invests secondary transfer printing electric charge in the action with electric charge, also can be to the middle transfer article homogeneous electricity that disappears, in order to carry out the back from the China ink of image carrier as transfer printing.
According to the present invention, even cause that because of the translational speed of intermediate transfer body is different the surface potentials of the intermediate transfer body before the electricity that disappears are discrete, also can be to the middle transfer article homogeneous electricity that disappears, in order to carry out the back from the China ink of image carrier as transfer printing.
According to the present invention, use the corona consumer appliance as intermediate transfer body discharge system, be applied to the flip-flop of the easy control among the voltage on the above-mentioned corona consumer appliance by switching, can be easy to the electric control that disappears of middle transfer article.
According to the present invention, only use an electric conductivity brush portion part to contact disappear electricity and the cleaning that just can carry out this intermediate transfer body with the intermediate transfer body, compare with cleaning device with the discharge system that the intermediate transfer body is set respectively, can realize cost degradation.
According to the present invention, even the China ink from the intermediate transfer body of image carrier transfer printing is discrete as interior carried charge, the transfer printing tolerance limit in the time of also suppressing China ink picture on this intermediate transfer body toward the transfer printing of transfer printing material low, transfer printing stably should the China ink picture.
According to the present invention, even in above-mentioned pre-transfer Charging system makes black image-tape electricity way on the intermediate transfer body, the surperficial translational speed of intermediate transfer body changes, and also can make the China ink on this intermediate transfer body charged as whole homogeneous, prevents the low of transfer printing tolerance limit really.
Brief Description Of Drawings is as follows:
Fig. 1 relates to the summary pie graph of the color copy machine of first embodiment of the invention;
Fig. 2 is the sectional view that is used for the intermediate transfer belt of above-mentioned color copy machine;
Fig. 3 is the enlarged drawing of the primary transfer portion of above-mentioned color copy machine;
Fig. 4 is the disappear controlling party block diagram of electric charger (discharger) of the band of above-mentioned color copy machine;
Fig. 5 a-c represents variation, band disappear the ON/OFF time of electric charger and the output map of primary transfer biasing device of the surface potential of intermediate transfer belt respectively;
Fig. 6 relates to the summary pie graph of the color copy machine of second embodiment of the invention;
Fig. 7 relates to the summary pie graph of the electric conductivity brush portion part of modified example;
Fig. 8 is the block scheme of control system of the charged condition of control PTC;
Fig. 9 a-b represents the time diagram of the grid voltage control of the CD-ROM drive motor of intermediate transfer belt of ground paper pattern and PTC respectively;
Figure 10 is the mode chart of demonstration transferring properties of the relation of the transfer printing electric current of expression secondary transfer printing portion and transferring rate;
Below, embodiments of the invention are described, it is that the present invention is useful in the electro photography color copy machine (being designated hereinafter simply as " color copy machine ") as image processing system.
Fig. 1 relates to the summary pie graph of image forming part of the color copy machine major part of the embodiment of the invention, this color copy machine has illustrated coloured image reading part (being designated hereinafter simply as " colour scanner "), sheet feed section and control part etc. or not except image forming part shown in Figure 1.
Above-mentioned colour scanner decomposes the coloured image information that light reads original copy with for example red, green, blue (following brief note respectively is " R, G, B ") look, is transformed into the electric signal of image.And based on R, the G of this colour scanner gained, the look exploded view image signal intensity level of B, do not having illustrated image processing part to carry out the look conversion process, deceived the color image data of (black), bluish-green (cyan), dark red (magenta), yellow (yellow) (following brief note respectively for " Bk, C, M, Y).
The image forming part of Fig. 1 by the photoreceptor cleaning device of forming as the photoconductor drum 100 of image carrier, as charged charger 200, cleaning blade and the hairbrush of Charging system 300, as exposure device do not have illustrated write optical module, as developing apparatus rotary (revolver) developing device 400, intermediate transfer assembly 500, paper transfer printing assembly 600, use the formations such as photographic fixing assembly of a pair of fixing roller 701.
Above-mentioned photoconductor drum 100 dispose along arrow counter-clockwise direction revolution, around it charged charger 200, photoreceptor cleaning device 300, rotary developing device 400 selected developers, intermediate transfer assembly 500 as the intermediate transfer belt 501 of intermediate transfer body etc.
In addition, the above-mentioned optical module that writes will be transformed into light signal from the color image data of colour scanner, on surface, carry out the light corresponding and write, on photoconductor drum 100, form electrostatic latent image with original image by the charged charger photoconductor drum 100 charged by homogeneous.This write optical module with for example as the semiconductor laser of light source, lasing fluorescence drive control part, polygon prism and revolution thereof with formations such as motor, f/ θ lens, catoptrons.
Above-mentioned rotary developing device 400 by the Bk developer 401 that uses the Bk ink powder, use the C ink powder C developer 402, use the M developer 403 of M ink powder, the development rotary driving part etc. that uses the Y developer 404 of Y ink powder and make assembly integral body do counter clockwise rotation to constitute.Each developer that is arranged in this rotary developing device 400 is made of development sleeve, developer agitator, developer roll drive division etc., development sleeve is as developer carrier, for making latent electrostatic image developing, make developer magnetic fringe contact photoconductor drum 100 the surface and turn round, developer agitator is stirred and is turned round for having drawn developer, and the developer roll drive division makes developer roll turn round towards the clockwise direction of arrow.
In the present embodiment, ink powder in each developer is by electronegative with the stirring of ferrite carrier, by there not being illustrated developing bias supply that the development bias voltage that alternating voltage Vac (alternating component) overlaps on the negative DC voltage Vdc (flip-flop) is applied on each development sleeve as the development bias voltage applying device, development sleeve for the metallic matrix layer of photoconductor drum 100 executed be biased into decide current potential.
Under the holding state of color copy machine body, rotation developing device 400 stops in the origin-location that Bk developer 401 is positioned at developing location, duplicate action at the beginning, begin to read the Bk color image data from fixing time colour scanner 1, according to this color image data, carry out light by laser and write, the formation electrostatic latent image (below, to be called " Bk electrostatic latent image " according to the formed electrostatic latent image of Bk view data, also identical for C, M, Y).Before the electrostatic latent image leading section arrives the Bk developing location that can develop, make the Bk development sleeve begin revolution, make the Bk latent electrostatic image developing with the Bk ink powder.After this, the developing operation in Bk electrostatic latent image zone is proceeded, when the rearward end of Bk electrostatic latent image is passed through the Bk developing location, and 400 revolutions of rotation developing device, the developer of back color is come developing location fast.This action finishes before formed electrostatic latent image leading section arrives according to the view data of back at least.
Above-mentioned intermediate transfer assembly 500 is made of intermediate transfer belt 501 grades as the intermediate transfer body, and this intermediate transfer belt is by if setting up in roller.Around above-mentioned intermediate transfer belt 501, dispose pre-transfer charger as pre-transferring charged device (following brief note is " PTC ") 502, paper transfer printing assembly 600 the secondary transfer printing band 601 as transfer printing material carrier, as the secondary transfer printing electric charge invest the secondary transfer printing bias voltage roller 605 of device, as the charged charger 503 of intermediate transfer body discharge system, as the band cleaning blade 504 of intermediate transfer body cleaning device, as the lubricant brush 505 of lubricant coating device etc.
Intermediate transfer belt 501 is being set up by the primary transfer bias voltage roller 507 that invests device as the primary transfer electric charge, band driven roller 508, band idler roller 509, secondary transfer printing subtend roller 510, cleaning subtend roller 511 and as the band of discharge system before the primary transfer electric roller 512 that disappears.Each roller is formed by conductive material, each the roller ground connection beyond the primary transfer bias voltage roller 507.By to decide electric current or fixed voltage-controlled primary transfer power supply 801, will be controlled to be the transfer bias supply primary transfer bias voltage roller 507 of the curtage of institute's sizing as coincidence number according to China ink.In addition, do not advise intermediate transfer belt 501 to rotate by there being the rotating band driven roller 508 of illustrated drive motor to drive along the direction of arrow.
Shown in Fig. 2 sectional view, above-mentioned intermediate transfer belt 501 is by top layer 501a, and the sandwich construction band that middle layer 501b, the 501c of basic unit form constitutes.The outer peripheral face side that contacts with photoconductor drum 100 is top layer 501a, and the inner peripheral surface side is the 501c of basic unit.Be useful on bonding above-mentioned two-layer adhesive linkage 501d between middle layer 501b and the 501c of basic unit.
With the China ink on the photoconductor drum 100 as the transfer printing portion (hereinafter referred to as " primary transfer portion ") of transfer printing on intermediate transfer belt 501, by setting up primary transfer bias voltage roller 507 and being with the electric roller 512 that disappears to make intermediate transfer belt 501 contact photoconductor drums 100 sides, between photoconductor drum 100 and intermediate transfer belt 501, form contact (nip) portion of institute's Fixed width degree.The disappear inner peripheral surface of brush 513 and the intermediate transfer belt 501 of this contact site of band as the ground connection of primary transfer portion discharge system is joined.
As shown in Figure 3, the contact width of above-mentioned primary transfer portion The distance L of the connecting position of the brush 513 that disappears from band rotation direction dirty end to band of n and above-mentioned contact site be set at can obtain fixed transfer printing condition.
Before the above-mentioned primary transfer portion China ink from the intermediate transfer belt 501 of photoconductor drum 100 transfer printings looked like to be transferred to copy paper as the transfer printing material, above-mentioned PTC502 made this China ink charged as homogeneous.
Use the discharger only apply AC voltage or to apply AC+DC voltage as the above-mentioned band electric charger 503 that disappears.In addition, the intermediate transfer belt 501 that above-mentioned band cleaning blade 504 is erected at the part of cleaning subtend roller 511 relatively joins in contrary mode, can not switch by there being the illustrated structure of disembarking that connects, and the relative intermediate transfer belt 501 of this band cleaning blade is joined or leaves.
Above-mentioned band disappear electric charger 503 and band cleaning blade 504 gauge tap as described below, for example, when forming a full-color image, after secondary transfer printing finishes, at least before finishing in a full week of intermediate transfer belt 501 operations, make and be with the electric charger 513 that disappears to be located on position, band cleaning blade 504 joins with intermediate transfer belt 501.When repeating to form full-color image, after secondary transfer printing finishes, before the front end of subsequently China ink picture arrives disappear electric position and cleaning position respectively, make the band electric charger 503 that disappears be located on position, band cleaning blade 504 joins with intermediate transfer belt 501.When single color image of formation, after primary transfer finishes, before finishing in a full week of intermediate transfer belt 501 operations at least, make and be with the electric charger 503 that disappears to be located on position, band cleaning blade 504 joins with intermediate transfer belt 501.When repeating to form single color image, after primary transfer finishes, before the front end of subsequently China ink picture arrives disappear electric position and cleaning position respectively, make the band electric charger 503 that disappears be located on position, band cleaning blade 504 joins with intermediate transfer belt 501.
Above-mentioned lubricant applying brush 505 grind are shaped to tabular, as the zinc stearate 506 of lubricant, with grinding and particulate be coated on the intermediate transfer belt 501.This lubricant applying brush 505 also be arranged to relatively intermediate transfer belt 501 connect from, control it and contact with intermediate transfer belt 501 fix time.
Above-mentioned paper transfer printing assembly 600 is made of secondary transfer printing band 601 grades, this secondary transfer printing band 601 is being set up by three backing roll 602-604, but intermediate transfer belt 501 crimping on the above-mentioned relatively secondary transfer printing subtend of secondary transfer printing band 601 roller 510 that 602,603 of backing rolls are being set up.Be driven roller one of among three backing roll 602-604, it is not by there being illustrated drive unit revolution, and by this driven roller, secondary transfer printing band 601 is driven running.Seizing intermediate transfer belt 501, copy paper and secondary transfer printing band 601 on both sides by the arms between above-mentioned secondary transfer printing bias voltage roller 605 and the above-mentioned secondary transfer printing subtend roller 510, by the secondary transfer printing power supply 802 of deciding Current Control apply decide the transfer bias of electric current.In addition, being provided with does not have the illustrated structure of disembarking that connects, and it drives backing roll 602 and secondary transfer printing bias voltage roller 605, makes above-mentioned secondary transfer printing band 601 and secondary transfer printing bias voltage roller 605 have the position of above-mentioned relatively secondary transfer printing subtend roller 510 crimping and the position of leaving.Being in the above-mentioned secondary transfer printing band 601 that leaves the position represents with double dot dash line in Fig. 1.
Disposing disappear electric charger 606 and of copy paper as transfer printing material discharge system in the part subtend that is wound on backing roll 603 towards fixing roller of above-mentioned secondary transfer printing band 601 as the band of the transfer printing material carrier discharge system electric charger 607 that disappears.In addition, the coiling of secondary transfer printing band 601 in the drawings the part on the backing roll 604 of downside join with cleaning blade 608 as transfer printing material carrier cleaning device.
The above-mentioned copy paper electric charger 606 that disappears can separate copy paper with the intensity of copy paper itself by electricity that electric charge on the copy paper is disappeared well with secondary transfer printing band 601.The above-mentioned band electric charger 607 that disappears can disappear to the electric charge that remains on the secondary transfer printing band 601 that is invested at secondary transfer printing bias voltage roller 605.The attachment that above-mentioned cleaning blade 608 is removed attached to secondary transfer printing band 601 surfaces carries out cleaning.
In the color copy machine of said structure, image forms the cycle at the beginning, and by there not being illustrated CD-ROM drive motor, photoconductor drum 100 turns round towards counter-clockwise direction as shown by arrows, by driven roller, intermediate transfer belt 501 turns round towards clockwise direction as shown by arrows.Along with the revolution of intermediate transfer belt 501, form Bk China ink picture, C China ink picture, M China ink picture, Y China ink picture, be combined in the final China ink picture that forms on the intermediate transfer belt 501 by Bk, C, M, Y order stack.
Above-mentioned Bk China ink picture forms and carries out as follows, and charged charger 200 makes photoconductor drum 100 homogeneous electronegative to decide current potential by corona discharge.By writing optical module, when carrying out the grating exposure according to the Bk colour picture signal, electric charge and the exposure light amount of the part that is exposed of the charged photoconductor drum 100 of homogeneous disappeared formation Bk electrostatic latent image pro rata originally.Subsequently, contact with this Bk electrostatic latent image by the electronegative Bk ink powder on the Bk developer roll, the non-cohesive residual part that electric charge is arranged at photoconductor drum 100 of ink powder, the Bk ink powder is adsorbed on the part that does not have electric charge, the part that promptly is exposed, and forms the Bk China ink picture similar to electrostatic latent image.The Bk China ink that is formed on the photoconductor drum 100 is being on the surface of the intermediate transfer belt 501 that constant speed is driving under the contact condition with photoconductor drum 100 as being transferred.Below, the China ink from photoconductor drum 100 toward intermediate transfer belt 501 is called " band transfer printing as transfer printing.
Remain in after the above-mentioned band transfer printing photoconductor drum 100 surfaces if in not transfer printing residual toner with above-mentioned photoreceptor cleaning device 300 cleanings, prepare against re-using of photoconductor drum 100.
On photoconductor drum 100, the Bk image forms after the operation, carry out the C image and form operation, fix time and begin to read by the resulting C view data of colour scanner, carry out laser according to this C view data to write, form the C electrostatic latent image.Then, after the rearward end of Bk electrostatic latent image is in front passed through and before the arrival of the leading section of C electrostatic latent image, be rotated the revolution action of developing device, C developer 402 is set to developing location, makes the C latent electrostatic image developing with the C ink powder.After, continue the development in C electrostatic latent image zone, C electrostatic latent image rearward end by the time, the same with Bk developer 401 occasions of front, be rotated the revolution action of developing device, the M developer 403 of back is moved to developing location.This action finishes before the leading section of the M of back electrostatic latent image arrives developing location.
Form in the operation at the image of M and Y, reading color image data, form electrostatic latent image separately, development and above-mentioned Bk, C operation are identical, and omission is described.
The China ink picture order contraposition that order is formed on Bk, C on the photoconductor drum 100, M, Y on one side transfer printing on intermediate transfer belt 501.Like this, on intermediate transfer belt 501, form four looks superimposed China ink picture.Superimposed China ink picture on this intermediate transfer belt 501 is after the PTC502 homogeneous is charged, and transfer printing once is on copy paper in secondary transfer printing operation subsequently.
Form action beginning period at above-mentioned image, the sheet feed section paper supply of never illustrated copy paper paper feeding cassette or hand paper feed tray etc. is not having the contact site standby of illustrated a pair of resistance paper bowl.Then, in the secondary transfer printing portion that forms contact site by secondary transfer printing subtend roller 510 and secondary transfer printing bias voltage roller, when the front end of the China ink picture on the middle transfer belt 501 arrives, drive the resistance paper bowl and carry out copy paper and China ink as involutory, make correct before the duplicating machine consistent with this China ink as front end.Then, the China ink on copy paper and the intermediate transfer belt 501 is as superimposed, by secondary transfer printing portion.At this moment, by being applied to the transfer bias on the secondary transfer printing bias voltage roller, the transfer printing once of the superimposed China ink picture of four looks on the intermediate transfer belt 501 is on copy paper.After this, when the secondary transfer printing band when the secondary transfer printing direction of belt travel disappears the subtend portion of electric charger 606 by the copy paper that is configured in secondary transfer printing portion downstream side, copy paper is disappeared, peel off intermediate transfer belt 501, by there not being illustrated a pair of distributing roller to be sent to outside the device body, pile up up in not having illustrated copy pallet on the surface, obtains the full color copy.
On the other hand, China ink is cleaned by band cleaning blade 504 as remaining in intermediate transfer belt 501 lip-deep ink powders after transfer printing is on copy paper, and with there not being the illustrated structure of disembarking that connects, this cleaning blade is pushed on the intermediate transfer belt 501.
Here, when repeating to duplicate, the action of colour scanner and to form images toward photoconductor drum 100 be after the image of first the 4th look (Y) forms operation, fix time, carry out the image formation operation of second first look (Bk).The superimposed China ink picture of 501 four looks when first of intermediate transfer belt at above-mentioned band cleaning blade 504 surface, cleaning area, carries out the band transfer printing of second Bk China ink picture after the disposable transfer printing process of copy paper.After this, identical with first action.
Above described be the copy mode that obtains four-color full-color look copy, still, triple color copying pattern, two look copy mode occasions, its operating principle is identical with four look patterns.Single-color copying pattern occasion, decide number and finish before, only make the developer of institute's fixation of rotation developing device 400 be made as the developing operation state, duplicate action on the intermediate transfer belt 501 under the state continuously will being with cleaning blade 504 to press against.
Below, describe making the disappear control of electric charger 503 of the band of electricity that disappears of intermediate transfer belt 501 behind the above-mentioned secondary transfer printing.
Fig. 4 is as the disappear block scheme of the control system that control part 900 grades of control device of the electric condition that disappears of electric charger 503 constitute of the above-mentioned band of control.In Fig. 4, control part 900 by CPU901, ROM902, RAM903, I/O interface 904 etc. constitute, CD-ROM drive motor 508a, disappear the electricity be connected on the I/O interface 904 with power supply 804 and mark sensor 905 etc., CD-ROM drive motor 508a is connected with the band driven roller 508 of intermediate transfer belt 501, and mark sensor 905 is used to detect the revolution that is located at intermediate transfer belt 501 inner peripheral surfaces and puts detection mark (not diagram).
With power supply 804, use the voltage that can will comprise flip-flop and alternating component to be applied to the device of being with on the electric charger 503 that disappears as the above-mentioned electricity that disappears.In order to switch this band electric condition of disappearing of electric charger 503 that disappears, can make at least one variation in the flip-flop that applies voltage and the alternating component, but in the present embodiment, calm viewpoint easy to control is considered, switches the flip-flop sizes at above-mentioned control part 900.
In addition, voltage being applied to the electricity that disappears that above-mentioned band disappears on the electric charger 503 set according to the output signal of above-mentioned mark sensor 905 with the on/off time of power supply 804.
Fig. 5 is that the full color of superimposed four looks China ink picture on intermediate transfer belt 501 is duplicated the disappear time diagram of on/off time one example of electric charger 503 of the variation of the surface potential that shows intermediate transfer belt 501 when the action secondary carries out continuously and band.The figure line of upside is the surface potential of the intermediate transfer belt 501 measured with potentiometric sensor in the PTC of Fig. 1 subtend position among the figure, and 1., 2., 3., 4. symbol represents the surface potential of the primary transfer part of first look, second look, the 3rd look and the 4th look respectively.Can understand from Fig. 5, whenever carry out primary transfer, from primary transfer bias voltage roller 507 positive charge be invested the back side of intermediate transfer belt 501, the surface potential of the photoconductor drum side of intermediate transfer belt 501 becomes big towards the negative polarity direction.Especially as present embodiment, when using the higher intermediate transfer belt 501 of resistance ratio, the electric charge that is invested easily remains on the intermediate transfer belt 501 temporarily, and above-mentioned surface potential rises very remarkable.Like this, whenever carry out primary transfer, the surface potential of intermediate transfer belt 501 becomes big toward the negative polarity direction, so with the primary transfer number of times, be that China ink on the intermediate transfer belt 501 is relevant as superimposed number of times, the surface potential of intermediate transfer belt 501 takes place discrete.
More particularly, shown in Fig. 5 c, may be controlled to China ink from the voltage V of primary transfer bias voltage roller 507 output increases as the transfer printing number of times.According to a particular embodiment of the invention, when the first China ink picture for example Bk China ink picture when photoconductor drum 100 is transferred on the intermediate transfer belt 501, control by power supply 801, the transfer bias output of primary transfer bias voltage roller 507 can be 1000V, then, next China ink picture in coloured image forms for example C China ink picture can be increased to 1500V from the transfer bias of primary transfer bias voltage roller 507 outputs when photoconductor drum 100 is transferred on the intermediate transfer belt 501; After, for M, Y China ink picture, the transfer bias of exporting from primary transfer bias voltage roller 507 can be increased to 2000V, 2500V respectively.This shows that in above-mentioned operation of the present invention, the transfer bias of exporting from primary transfer bias voltage roller 507 can increase as serial number according to the China ink that is transferred to intermediate transfer belt 501 from photoconductor drum 100.
Therefore, in the present embodiment, by above-mentioned control part 900,, switch the electric condition that disappears of being with the electric charger 503 that disappears to be produced, so that can disappear by homogeneous according to the surface potential of intermediate transfer belt 501.Specifically, according to toward the China ink of intermediate transfer belt 501 as superimposed number of times, the above-mentioned flip-flop size of electricity with the output voltage of power supply 803 that disappear switched in control.China ink often the time, becomes big by making above-mentioned flip-flop as superimposed, improves the electric energy power that disappears and disappears.China ink diminishes by making above-mentioned flip-flop as superimposed number of times after a little while, reduces the electric energy power that the disappears electricity that disappears, and does not make intermediate transfer belt 501 with the electric charge of going up antipolarity.
In addition, when using ground paper as copy paper, carry out the ground paper pattern, the CD-ROM drive motor 508a of control band driven roller 508 switches to roughly 1/2nd of common paper occasion with the translational speed of intermediate transfer belt 501.Like this, the translational speed of intermediate transfer belt 501 is slack-off, disappears by the band electric charger 503 that disappears easily.Therefore, in the present embodiment, when implementation ground paper pattern makes the translational speed of intermediate transfer belt 501 slack-off, be adjusted to littler than common paper occasion by making the voltage flip-flop that applies, reduce the electric energy power that the disappears electricity that disappears, do not make intermediate transfer belt 501 with the electric charge of going up antipolarity.
Above, if according to present embodiment, thereby even be with the discrete occasion of preceding intermediate transfer belt 501 surface potentials of the electricity that disappears toward different the causing of the transfer printing number of times of intermediate transfer belt 501, also can be according to its transfer printing number of times, switching is applied to the size of the voltage (flip-flop) on the charged electric charger 503 that disappears, so can disappear to middle transfer belt 501 homogeneous.When the translational speed of carrying out ground paper mode switch intermediate transfer belt 501, because of this translational speed difference, the surface potential of the intermediate transfer belt 501 before the electricity that disappears takes place discrete, for this occasion, according to the abovementioned embodiments of the present invention, also can carry out homogeneous to middle transfer belt 501 disappears.Like this, can be by the above-mentioned homogeneous electricity that disappears, for use in the back from photoconductor drum 100 transfer ink pictures.
In the above-described embodiments, sometimes because of intermediate transfer belt 501 with invest secondary transfer printing electric charge in the electric charge action invest device whether subtend that the surface potential of intermediate transfer belt 501 takes place is discrete.In this occasion, preferably invest whether subtend of device according to intermediate transfer belt 501 and secondary transfer printing electric charge in the action, switch and be applied to the disappear size of the voltage (flip-flop) on the electric charger 503 of band, intermediate transfer body homogeneous is disappeared.
Especially as shown in Figure 1 do not use the secondary transfer printing band 601 of high electrical resistance, directly seize the copy paper occasion on both sides by the arms between being applied with between the secondary transfer printing bias voltage roller of middle resistance of positive polarity bias and the secondary transfer printing subtend roller, image portion on the intermediate transfer belt 501, promptly low than non-image with the absolute value that applies the secondary transfer printing bias voltage roller subtend surface potential partly of deciding transfer bias to some extent, it is discrete that surface potential takes place easily.At this moment, according to the secondary transfer printing bias voltage roller subtend that is applied with transfer bias be image portion or non-image portion, switch and to be applied to the disappear size of the voltage (flip-flop) on the electric charger 503 of band.For example, when the image portion with the secondary transfer printing bias voltage roller subtend that is applied with transfer bias is disappeared electricity, be with the flip-flop size of the voltage on the electric charger 503 that disappears to switch to littler than non-image with being applied to.The time of switching can decide according to the output signal of above-mentioned mark sensor 905.
Below, the implementation data more specifically of the color copy machine that relates to the foregoing description is described.
The intermediate transfer belt that uses thick 0.15mm, wide 368mm and interior girth 565mm is as above-mentioned intermediate transfer belt 501, and the translational speed of this intermediate transfer belt is set at 200mm/sec.
The top layer 501a of above-mentioned intermediate transfer belt 501 forms the insulation course of thick 1 μ m degree, and above-mentioned middle layer 501b forms the insulation course (specific insulation about 10 of the thick 75 μ m degree that are made of PVDF (polyvinylidene fluoride) 13Ω cm), the above-mentioned 501c of basic unit forms the middle resistive layer (specific insulation 10 of the thick 75 μ m degree that are made of PVDF (polyvinylidene fluoride) and titanium dioxide 8-10 11Ω cm).The specific insulation of measuring the formed intermediate transfer belt integral body of this material is 10 7-10 12Ω cm.Above-mentioned each specific insulation is to apply voltage 100v with the assay method of putting down in writing among the JISK6911 (Japanese Industrial Standards K6911) to keep measure for 10 seconds.In addition, the surface resistivity of measuring the top layer 501a side of above-mentioned intermediate transfer belt 501 with the resistance measurer " High Rester IP " of oiling electronics system is 10 7-10 12Ω/mouth.This surface resistivity also can be measured with the surface resistance determination method of putting down in writing among the JISK6911 except measuring with above-mentioned resistance measurer.
Use the nickel plating metallic roll as primary transfer bias voltage roller 507, use metallic roll, use metallic roll or electroconductive resin roller as other rollers as the band electric roller 512 that disappears.On primary transfer bias voltage roller 507, apply the direct current transfer bias of suitable size, for example color ink is looked like to apply 1.0kv, second look China ink picture is applied 1.3-1.4kv, the 3rd look China ink picture is applied 1.6-1.8kv, the 4th look China ink picture is applied 1.9-2.2kv.
The contact of above-mentioned primary transfer portion is wide
Figure A9810596200181
N is set at 10mm, and the distance L of the connecting position of the brush 513 that disappears from the dirty end of direction of belt travel to band of above-mentioned contact site is set at 7mm (with reference to Fig. 3).The electric conductivity part that use plants the carbon containing resin fibre is as the above-mentioned band brush 513 that disappears.
The charger that uses the band gate electrode is as above-mentioned PTC502, by PTC with 803 couples of these PTC502 of power supply apply with intermediate transfer belt 501 on the identical Dc bias of charged polarity of China ink picture.More particularly, the electric main 502a of PTC502 applied decide the DC voltage of Current Control, gate electrode 502b is applied the DC voltage that is set in the 0--3kv scope for-500 μ A.
Be applied to the disappear flip-flop of the voltage on the electric charger 503 of band and be set at as shown in table 1 belowly, voltage is set at 6KV between the crest of alternating component P-p, frequency number is 500HZ.
Table 1
Superimposed number of times What band disappeared electric charger applies voltage (flip-flop)
Common paper Ground paper
Once ????300v ????220v
Secondary ????400v ????280v
Three times ????500v ????340v
Four times ????600v ????400v
Use comprises that the roller of superficial layer and sandwich layer is as above-mentioned secondary transfer printing bias voltage roller 605, above-mentioned superficial layer is made of electric conductivity sponge or conducting rubber, above-mentioned sandwich layer is made of metal or electroconductive resin, is that the transfer bias of 10-20 μ A is applied on this roller with deciding Current Control.The thickness 100 μ m, the specific insulation 10 that use PVDF (polyvinylidene fluoride) to form 13The band of Ω cm is as above-mentioned secondary transfer printing band 601.
Use, is used by not having discharger that illustrated power supply only applies AC voltage or AC+DC voltage as the above-mentioned band electric charger 607 that disappears as the above-mentioned copy paper electric charger 606 that disappears by the discharger that do not have illustrated power supply and only apply AC voltage or AC+DC voltage.Above-mentioned cleaning blade 608 sets up the secondary transfer printing band 601 of part to join against angle direction by backing roll 604 relatively.
In the above-described embodiments, be illustrated as example as image carrier to use photoconductor drum 100, still, the present invention also can be applicable to the image carrier that uses other shapes, for example also can be used in to open a photoreceptor belt that is located between two rollers, moves for no reason.
In the above-described embodiments, be illustrated as example as the intermediate transfer body to use intermediate transfer belt 501, still, the present invention also can be applicable to the intermediate transfer body that uses other shapes.In addition, the electrical specification of above-mentioned intermediate transfer belt 501 (specific insulation, surface resistivity), thickness, structure (individual layer, two layers ...), material, material etc. can carry out various selections according to image-forming condition etc., adopts suitable intermediate transfer belt.
In the above-described embodiments, to use the brush that disappears to be illustrated as example as the primary transfer portion discharge system in the contact site of above-mentioned primary transfer portion, but the present invention can be applicable to that also other shaped members such as using scraping blade, roller are as above-mentioned primary transfer portion discharge system.In addition, with above-mentioned discharge system disappear the electricity the position be not defined as illustrated position in the foregoing description, also can be positioned at the contact site of primary transfer portion along the upstream side of intermediate transfer direction of belt travel on primary transfer bias voltage roller 507.The electric position that disappears in the contact site of above-mentioned transfer printing portion is not defined as a place, can disappear at some places yet.Be with the brush ground connection that disappears in the present embodiment, still, in scope not, also can apply opposite polarity bias voltage with the transfer printing electric charge to the influence of the transfer printing charge generation of above-mentioned contact site necessity.
In the above-described embodiments, be illustrated as example to use primary transfer bias voltage roller to invest device as the primary transfer electric charge, still, the present invention also can be used in and adopt the primary transfer electric charge of other shapes to invest device.In addition, along the intermediate transfer direction of belt travel, the downstream side of the electric position that disappears of the above-mentioned primary transfer portion discharge systems such as brush that disappear also can invest the primary transfer electric charge in the contact site of above-mentioned primary transfer portion.
In the above-described embodiments, voltage, electric current equivalence that the primary transfer electric charge that is applied to above-mentioned primary transfer bias voltage roller 507 grades invests the primary transfer bias voltage on the device are not limited to put down in writing in the foregoing description, can set suitable value according to various image-forming conditions.
In the above-described embodiments, be with the electric roller 512 that disappears to be illustrated as example as discharge system before the primary transfer to use, still, the present invention also can use other shaped members such as scraping blade, brush to replace this roller.
In the above-described embodiments, be illustrated as example to use secondary transfer printing bias voltage roller to invest device as the secondary transfer printing electric charge, still, the present invention also can use other shaped members such as scraping blade, brush to replace this roller.
In the above-described embodiments, use the transfer printing material carrier of secondary transfer printing band 601 as mounting transfer printing material in secondary transfer printing portion, still, the present invention also can use tube to wait other shaped members to replace this band.
In the above-described embodiments, electronegative to photoconductor drum 100, the two compositions of use are developer, adopt the developer of discharged-area development mode to be illustrated, but, the present invention is not limited to the charged current potential of above-mentioned photoconductor drum 100, and, be that developer, the developer that adopts regular visualization way are suitable for too for using single composition.
The following describes second embodiment of the invention, be omitted with the explanation of the first embodiment same section.
As shown in Figure 6, around intermediate transfer belt 501, subtend disposing pre-transfer charger 502 as pre-transferring charged device, as the secondary transfer printing band 601 of the transfer printing material carrier of paper transfer printing assembly 600, as the secondary transfer printing electric charge invest device secondary transfer printing bias voltage roller 605, be also used as the brush roll 514 as electric conductivity brush portion part of intermediate transfer body discharge system and intermediate transfer body cleaning device, as the lubricant applying brush 505 of lubricant coating device etc.
Above-mentioned electric conductivity brush roll 514 is in the disappear electricity and the cleaning of the laggard interline transfer belt 501 of secondary transfer printing, by disappear electricity with power supply 804 be applied in secondary transfer printing after the DC voltage of surface potential same polarity of intermediate transfer belt 501.Be the raising electrical efficiency that disappears, also can alternating voltage is superimposed on this DC voltage.In addition, by there not being the illustrated structure of disembarking that connects, above-mentioned electric conductivity brush roll 514 can being switched to relative intermediate transfer belt 501 and contact or leave.
Controlling above-mentioned brush roll 514 connects following manner and is switched on or switched off.For example, when forming a full-color image, after the secondary transfer printing knot speed, before the intermediate transfer belt 501 operations one week knot speed, make brush roll 514 contacts at least.When repeating to form full-color image, after secondary transfer printing finishes, before the China ink of back arrives the electric cleaning position that disappears as front end, make brush roll 514 contacts.When forming a single color image, after primary transfer finishes, before finishing intermediate transfer belt one week of 501 operations at least, make brush roll 514 contacts.When repeating to form single color image, after primary transfer finishes, before the China ink of back arrives the electric cleaning position that disappears as front end, make brush roll 514 contacts.
In the present embodiment, with China ink as transfer printing after on the above-mentioned copy paper, the surface of above-mentioned intermediate transfer body 501 is cleaned simultaneously by brush roll 514 electricity that disappears, this brush roll 514 is by there not being the illustrated structure of disembarking that connects to press against on the intermediate transfer belt 501.
When repeating to duplicate, the action of colour scanner and to form images toward photoconductor drum 100 be after the image of first the 4th look (Y) forms operation is in the image formation operation of fix time first look (Bk) that carries out second.After the intermediate transfer operation, carry out the band transfer printing of second Bk China ink picture at above-mentioned brush roll 514 surface, cleaning area.After this, identical with first action.
Above described be the copy mode that obtains four-color full-color look copy, still, triple color copying pattern, two look copy mode occasions, its operating principle is identical with four look patterns.Single-color copying pattern occasion, decide number and finish before, only make the developer of institute's fixation of rotation developing device 400 be made as the developing operation state, duplicate action on the intermediate transfer belt 501 under the state continuously in that brush roll 514 is pressed against.
According to present embodiment, only make a brush roll 514 contact intermediate transfer belts 501, can carry out the disappear electricity and the cleaning of intermediate transfer belt 501, so, the disappear device and the cleaning device occasion of electricity of intermediate transfer belt compared with being provided with respectively, can realize cost degradation.
Used corona discharger as intermediate transfer body discharge system in the past, although before and after the electricity back intermediate transfer belt surface potential that just disappears is OV, but the current potential of polarity will occur before the electricity that disappears a little while, but in the present embodiment, if adopt the structure that voltage is applied to the electricity that disappears on the brush roll 514, the current potential of polarity can not occur before the above-mentioned electricity that disappears, and can obtain the good electric effect that disappears.
In the present embodiment, use brush roll 514 as carrying out the intermediate transfer belt 501 electric conductivity brush portion part of electricity and cleaning that disappears, but also can use to comprise the electric conductivity brush portion part 516 of brush 516a as shown in Figure 7, this brush 516a is along cleaning extending axially of subtend roller 511.In this structure occasion, preferably as shown in Figure 7, set or make this brush of metallic roll 517 contact 516a, so that more effectively reclaim attached to the ink powder on the brush 516a of brush portion part 516 etc.On this metallic roll 517, apply the voltage higher, will be adsorbed onto the lip-deep attachment of metallic roll 517 by there not being recovery such as illustrated scraping blade attached to ink powder on the brush 516a of brush portion part 516 etc. with electrostatic force than parts 516.
In the above-described embodiments, also can switch the electric condition that disappears of brush roll 514 according to the surface potential of the intermediate transfer belt behind the secondary transfer printing 501, so that can disappear to middle transfer belt 501 homogeneous.For example, according to toward the China ink of intermediate transfer belt 501 as superimposed number of times, switches the size of electric current composition of the output voltage of the above-mentioned electricity usefulness power supply 804 that disappears.
In the instantiation of present embodiment, one brush roll 514 replaces the band in the instantiation of first embodiment disappear electric charger 503 and band cleaning blade 504, other conditions are identical with the instantiation of first embodiment, the electric conductivity brush fiber is planted on the metallic axis body, as the brush roll 514 of the intermediate transfer belt behind the secondary transfer printing 501 is disappeared electricity and cleaning.Apply with the electricity that disappears before the DC voltage (positive voltage) of surface potential opposite polarity of intermediate transfer belt 501, apply the brush roll 514 that this institute decides the electric conductivity of voltage by use, even as present embodiment, use comprises intermediate transfer belt 501 occasions of the sandwich construction of high-resistance middle layer 501b, the electric charge of electricity of also can not taking place to have disappeared appears at lip-deep phenomenon once more, can carry out the disappearing of intermediate transfer belt 501 behind the secondary transfer printing well.
The following describes the third embodiment of the present invention, the summary pie graph of image forming part that relates to the color copy machine major part of present embodiment please refer to Fig. 1.
The PTC502 that regards to as pre-transferring charged device describes down.
Sometimes owing to comprise shadow tone portion and panchromatic accent portion or comprise ink powder overlapping amount different piece, carried charge is discrete state to China ink picture from the intermediate transfer belt 501 of photoconductor drum 100 transfer printing.In addition, also exist because of the downstream side along the intermediate transfer direction of belt travel in abutting connection with above-mentioned primary transfer portion the space took place peels off discharge, the China ink on the intermediate transfer belt after the primary transfer 501 is as the discrete phenomenon of interior generation carried charge.This same China ink reduces as the discrete transfer printing tolerance limit of secondary transfer printing portion that can make of interior carried charge.
Therefore, charged by making in the present embodiment as homogeneous at the China ink of PTC502 before the copy paper transfer printing, solve same China ink as interior carried charge dispersed problem, improve the transfer printing tolerance limit of secondary transfer printing.
As mentioned above, according to present embodiment, by making the China ink from the intermediate transfer belt 501 of photoconductor drum 100 transfer printings charged as homogeneous, though the China ink on this intermediate transfer belt 501 as interior charged be discrete, also can make the China ink on the intermediate transfer belt 501 roughly certain as the transferring properties of each one.Therefore, the transfer printing tolerance limit in the time of suppressing toward the copy paper transfer printing is low, and transfer printing stably should the China ink picture.
In the above-described embodiments, changed according to translational speed by charged carried charge at PTC502 as the intermediate transfer belt 501 of charged object.For example, the translational speed of intermediate transfer belt 501 is slow, and the same part of the China ink picture on the intermediate transfer belt 501 is elongated by the charging zone time of PTC502, and it is many that carried charge just becomes.In contrast, if the translational speed of intermediate transfer belt 501 is fast, the black image-tape electric weight on the intermediate transfer belt 501 tails off.Therefore, in the way, charged position of the China ink picture on the intermediate transfer belt 501 by PTC502, when the translational speed of middle transfer belt 501 changes, preferably, make black image-tape electric weight not change on the way according to translational speed control PTC.
The foregoing description forms in the device at coloured image, when copy paper uses ground paper, by selecting to carry out the ground paper pattern, (per minute duplicates number not reducing copying speed as far as possible, copies per minute) under the condition, form the responsiveness of switching device shifter integral body in the action way at image, so that carry out well toward the secondary transfer printing of copy paper and photographic fixing after this.Specifically, after the China ink on the photoconductor drum 100 is transferred on intermediate transfer belt 501 as the rear end, and the China ink on the intermediate transfer belt 501 arrives before the secondary transfer printing portion as front end, and the translational speed of intermediate transfer belt 501 is switched to 1/2 degree.If carry out such ground paper pattern, in the way, charged position of the China ink picture on the intermediate transfer belt 501 by PTC502, the translational speed on the intermediate transfer belt 501 changes.Therefore, preferably control PTC, so that black image-tape electric weight does not change on the way according to the translational speed of intermediate transfer belt 501.
Fig. 8 is the block scheme as the control system that constitutes with control part 900 grades according to the control device of the grid voltage of the translational speed of above-mentioned intermediate transfer belt 501 control PTC502.In Fig. 8, control part 900 is made of CPU901, ROM902, RAM903, I/O interface 904 etc., CD-ROM drive motor 508a, PTC are connected on the I/O interface 904 with power supply 803 and mark sensor 905 etc., CD-ROM drive motor 508a is connected with the band driven roller 508 of intermediate transfer belt 501, and mark sensor 905 is used to detect the rotary position that is located at intermediate transfer belt 501 inner peripheral surfaces and detects with mark (not diagram).
The time diagram of CD-ROM drive motor that intermediate transfer belt was used when Fig. 9 represented above-mentioned ground paper pattern and the control of the grid voltage of PTC, time of representing of symbol A begins to duplicate action in the drawings, China ink on the intermediate transfer belt 501 arrives as front end before the charged position of PTC502 (symbol B), begins practiced charged by PTC502.Detect the result of mark on the intermediate transfer belts according to above-mentioned mark sensor 905, judge that the China ink that makes on the photoconductor drum 100 not arrives time (symbol C) before the secondary transfer printing portion as front end.In this time, control band CD-ROM drive motor 508a controls to the translational speed of intermediate transfer belt 501 and is approximately 1/2.Meanwhile, control PTC makes the grid voltage on the grid 502b that is applied to PTC502 be roughly 1/2 with power supply 803, reduces charged ability.Like this, can not changed along with the reduction of intermediate transfer belt translational speed by the black image-tape electric weight on the charged intermediate transfer belt 501 at PTC502.China ink on the intermediate transfer belt 501 stops to apply bias voltage toward PTC502 during as the charged position of rear end by PTC502 (symbol D).
As mentioned above, when carrying out above-mentioned ground paper pattern etc., in PTC502 makes black image-tape electricity way on the intermediate transfer belt 501, even the intermediate transfer belt translational speed changes, also can make the China ink on this intermediate transfer belt 501 charged, can prevent the low of transfer printing tolerance limit really as whole homogeneous.

Claims (11)

1. image processing system comprises:
Mounting is from the intermediate transfer body of the China ink picture of image carrier transfer printing;
The primary transfer electric charge that will be used for investing from image carrier toward the electric charge of intermediate transfer body transfer ink picture this intermediate transfer body invests device;
Intermediate transfer body discharge system, the electric charge that will disappear invests the intermediate transfer body, with to the surface of China ink as the above-mentioned intermediate transfer body of transfer printing on the transfer printing material being disappeared;
It is characterized in that: the above-mentioned electric charge that disappears is directly proportional with the surface potential of intermediate transfer body.
2. according to the image processing system described in the claim 1, it is characterized in that:
Be formed on China ink on the above-mentioned image carrier as the superimposed transfer printing of several times on above-mentioned intermediate transfer body;
As the transfer printing number of times, switch the resulting electric charge that disappears of above-mentioned intermediate transfer body discharge system according to above-mentioned China ink toward the intermediate transfer body.
3. according to the image processing system described in the claim 1, it is characterized in that, as the transfer printing number of times, switch and invest the electric charge that device invests by above-mentioned primary transfer electric charge according to above-mentioned China ink toward the intermediate transfer body.
4. according to the image processing system described in the claim 1, it is characterized in that:
Be provided with the secondary transfer printing electric charge that will be used for investing above-mentioned transfer printing material body carrier and invest device from above-mentioned intermediate transfer body toward the electric charge of transfer printing material transfer ink picture;
Whether, above-mentioned secondary transfer printing electric charge switches toward the intermediate transfer body according to above-mentioned during charging operations from the resulting electric electric charge that disappears of above-mentioned intermediate transfer body discharge system in the face of investing device.
5. according to the image processing system described in the claim 1, it is characterized in that:
Be provided with the translational speed control device,, switch the translational speed of intermediate transfer body according to the thickness of transfer printing material;
Translational speed according to above-mentioned intermediate transfer body is switched from the resulting electric charge that disappears of above-mentioned intermediate transfer body discharge system.
6. according to the image processing system described in the claim 1, it is characterized in that:
Use the corona consumer appliance as above-mentioned intermediate transfer body discharge system, apply the voltage that comprises flip-flop and alternating component;
The above-mentioned electric charge that disappears changes the flip-flop size that is applied on the above-mentioned corona consumer appliance.
7. according to the image processing system described in the claim 1, it is characterized in that the intermediate transfer body is one to have first and second layers band at least.
8. according to the image processing system described in the claim 1, it is characterized in that, be provided with:
Electric conductivity brush portion part, this brush portion part with China ink is contacted as the above-mentioned intermediate transfer body of transfer printing after on the above-mentioned transfer printing material;
Power supply, this power supply will be applied on the above-mentioned electric conductivity brush portion part with the bias voltage of the surface potential opposite polarity of intermediate transfer body.
9. the image processing system described in according to Claim 8 is characterized in that, use can rotating electric conductivity brush roll as above-mentioned electric conductivity brush portion part.
10. according to the image processing system described in the claim 1, it is characterized in that, be provided with the pre-transfer Charging system, make the black image-tape that is transferred on the preceding above-mentioned intermediate transfer body of above-mentioned transfer printing material.
11. according to the image processing system described in the claim 10, it is characterized in that, be provided with control device, this control device basis is controlled the output of above-mentioned pre-transfer Charging system by the surperficial translational speed of the intermediate transfer body of the charged position of above-mentioned pre-transfer Charging system.
CNB981059627A 1997-03-31 1998-03-31 Image forming device Expired - Fee Related CN1148612C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP9098067A JPH10274892A (en) 1997-03-31 1997-03-31 Image forming device
JP098064/97 1997-03-31
JP098067/1997 1997-03-31
JP09806497A JP3594279B2 (en) 1997-03-31 1997-03-31 Image forming device
JP09806597A JP3611270B2 (en) 1997-03-31 1997-03-31 Image forming apparatus
JP098065/1997 1997-03-31
JP098065/97 1997-03-31
JP098064/1997 1997-03-31
JP098067/97 1997-03-31

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Cited By (9)

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CN100418018C (en) * 2003-07-03 2008-09-10 富士施乐株式会社 Image forming apparatus
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CN100585508C (en) * 2005-02-04 2010-01-27 柯尼卡美能达商用科技株式会社 Color image forming apparatus
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DE19813697C2 (en) 2001-05-31
KR19980080852A (en) 1998-11-25

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