CN105549356B

CN105549356B - Image forming apparatus and sub-image bearing member remove method for electrically

Info

Publication number: CN105549356B
Application number: CN201510690626.4A
Authority: CN
Inventors: 山下刚司; 宫崎贵史
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2014-10-24
Filing date: 2015-10-22
Publication date: 2018-06-26
Anticipated expiration: 2035-10-22
Also published as: JP2016085317A; CN105549356A

Abstract

A kind of image forming apparatus and except method for electrically, extends the service life of driving mechanism while developer exhaustion is inhibited.Including photoconductor drum,To the charging mechanism of photoconductor drum surface uniform charging,The exposure device of electrostatic latent image is formed after being exposed to the photoconductor drum surface,The developing apparatus of latent electrostatic image developing that will be formed on photoconductor drum by developer,So that photoconductor drum is around mobile photoreceptor drive motor,At the end of image formation acts,When the driving for stopping driving mechanism,It is come the driving to stopping driving mechanism after the latent image carrier Partial exposure being located between the exposure location of exposure mechanism and the development place of developing mechanism by exposure mechanism,When image formation acts beginning,It is since the driving of driving mechanism,The second latent image carrier part between until turning to the exposure location of exposure mechanism along latent image carrier gyratory directions for being located at the charging place of charging mechanism before since driving by exposure mechanism is exposed.

Description

Image forming apparatus and sub-image bearing member remove method for electrically

Technical field

The present invention relates to printer, facsimile machine, duplicator etc. using electrofax mode image forming apparatus and The sub-image bearing member that the sub-image bearing member all to the image forming apparatus is de-energized removes method for electrically.

Background technology

All the time, it is well known that being with the electrification polarity of toner be phase come uniform charged by charging mechanism Same polarity, and on the surface of the photoreceptor as sub-image bearing member is exposed and potential decay by exposure mechanism After form electrostatic latent image, then, will by developing mechanism come to the toner image obtained after the latent electrostatic image developing formed turn It prints on middle transfer body or recording medium as transfer printing body.

At the end of being acted Patent Document 1 discloses printing, in the driving for stopping driving photoreceptor and developing mechanism So that photoreceptor rotates one week more before mechanism, and photoreceptor is carried out by the exposure on exposure mechanism full surface to photoreceptor Except the image forming apparatus of electricity.In such a configuration, when driving mechanism is stopped at the end of printing acts, positioned at than exposing Photosensitive body portion or positioned at than exposure location more lean on photosensitive of the luminous point more by the revolution of photoreceptor (around movement) direction upstream side The photoreceptor in body gyratory directions downstream side is partially in by the state except electricity.Therefore, when subsequent printings action is started, When starting driving mechanism, when the printing is acted by under uniform charged state photosensitive body portion reach development place until it Between and the photosensitive body portion that passes through place of developing all is by the state except electricity.As a result, when its printing acts, by uniform charged During photosensitive body portion under state is reached until development place, if not applying the developing bias of developing mechanism, from developing machine Structure (0V) just will not both generate the photosensitive body portion (0V) carrier attachment, will not generate toner attachment.

However, in the image forming apparatus disclosed in above patent document 1, at the end of printing acts, stop driving Before mechanism, in order to enable the full surface of photoreceptor is become by exposing by the state except electricity, the exposure has been merely it and has caused Photoreceptor carries out the extra revolution more than one week.In this way, every time at the end of printing action, because so that photoreceptor carries out one week More extra revolutions, just produce so that driving mechanism the lost of life the problem of.

【Patent document 1】No. 3457083 bulletin of (Japan) franchise

Invention content

In order to solve the above problems, technical scheme of the present invention 1 provides a kind of image forming apparatus, including：Sub-image carries Body；Charging mechanism charges to the surface of the latent image carrier；Exposure mechanism passes through the latent image carrier to being electrically charged Surface expose and form electrostatic latent image；Developing mechanism, using the electrostatic latent image being formed on the latent image carrier as toning Agent picture develops；The latent image carrier is rotated around in driving mechanism, it is characterized in that, at the end of image formation acts, When the driving for stopping the driving mechanism, be by the exposure mechanism come the exposure to being located at the exposure mechanism After the first latent image carrier Partial exposure between point and the development place of the developing mechanism, just stop the drive of the driving mechanism It is dynamic, also, when image formation acts beginning, be from the driving of the driving mechanism, pass through the exposure mechanism pair The charging place for being located at the charging mechanism before since the driving turns to institute along the latent image carrier gyratory directions The second latent image carrier part between until stating the exposure location of exposure mechanism is exposed.

According to the present invention it is possible to obtain it also is able to extend the spy in the service life of driving mechanism while developer exhaustion is inhibited It is effective.

Description of the drawings

It is the ideograph that the summary of printer 20 involved by present embodiment is formed shown in Fig. 1.

It is the definition graph of the control system of printer 200 shown in Fig. 2.

It is the opportunity flow chart of the single color printing action sequence of previous image forming apparatus shown in Fig. 3.

It is imaging unit 11 and the amplification synoptic diagram of transfer unit 20 shown in Fig. 4.

It is the opportunity flow chart of the full color printing action sequence of previous image forming apparatus shown in Fig. 5.

It is the opportunity flow chart of the single color printing action sequence of the image forming apparatus of present embodiment shown in Fig. 6.

It is the ideograph of the electricity removing of the photoconductor drum of present embodiment shown in Fig. 7.

It is the opportunity flow chart of the full color printing action sequence of the image forming apparatus of present embodiment shown in Fig. 8.

Specific embodiment

Hereinafter, an embodiment of the image forming apparatus for being applicable in the present invention illustrates.

First, the image forming apparatus involved by illustrating with reference to Fig. 1 as present embodiment full color printer (with Composition down referred to as " printer 20 ") and action.

It is the ideograph that the summary of the printer 20 is formed shown in Fig. 1.

As illustrated in fig. 1, printer 20 is the printer of tandem intermediate transfer mode, equipped with imaging section 10, including Be useful for four imaging units 11Y, M, C, K full-color image being formed on the paper P as recording medium.Imaging unit 11Y, M, C, K use the toner corresponding to colors such as yellow (Y), magenta (M), cyan (C), black (K) respectively.

In addition, be additionally provided with transfer unit 20, when in each imaging unit 11 of imaging section 10 as the photosensitive of sub-image bearing member Body rouses 1Y, M, C, and the four colour toners pictures formed on K can be together secondarily transferred to as record by after overlappingly primary transfer On the paper P of medium.Photoconductor drum 1Y, M, C, K are diametersCylindrical shape, turned round with peripheral speed 50-200mm/s.

Be further provided with by with the sheet feed section 40 in paper P paper supplies to all secondary transfer sections 23 of transfer unit 20 and will It is fixed to by secondary transfer section 23 come the toner image of secondary transfer printing with the fixing section 30 on paper P and fixing section will be passed through 30 are fixed the paper P paper discharge of toner image to the paper discharge unit 52 outside device body 100.Then, device body has been further included All control machines as the control for carrying out the actions such as device in the required each portions of action control and each portion that set in 100 Main control section 110 and each driving source of structure, supply unit or waste-toner container etc..

The configuration of above-mentioned main each portion or each device is as follows.

Approximate centre in device body 100 is configured with transfer unit 20, including there are four be used as primary transfer Primary transfer the portion 22Y, M, C, K of mechanism and as the secondary transfer section 23 of secondary transfer printing mechanism and as middle transfer body Intermediate transfer belt 21 etc..Tool is configured with above in the figure of the transfer unit 20, and there are four the imaging units as imaging mechanism The imaging section 10 of 11Y, M, C, K, lower section is configured with sheet feed section 40 in figure, and right oblique upper is configured with fixing section 30 in figure, Left obliquely downward is configured with the main control section 110 as control mechanism in figure.Then, left oblique upper is matched in the figure of fixing section 30 It is equipped with paper discharge unit 52, and between the paper discharge unit 52 and fixing section 30, the secondary transfer section 23 of fixing section 30 and transfer unit 20 Between and secondary transfer section 23 and sheet feed section 4 between form from 4 paper supply of sheet feed section come paper P transport path 50.Separately Outside, the part that paper discharge unit 52 is provided in the framework 101 of device body 100 more protrudes upward than other parts, at it Left side is formed with ejection port 53 in figure, is formed with mounting pan portion 71 in the figure of the ejection port 53 in the upper plate portion in left side.

Imaging section 10 has imaging unit 11Y, M, C, K, and each imaging unit 11 is by corresponding respectively to yellow (Y), magenta The developer of the colors such as color (M), cyan (C), black (K) forms the toner image for resolving into assorted color to each photosensitive On body drum 1.In the image forming apparatus of this tandem, mainly by yellow (Y), magenta (M), cyan (C), black (K) etc. monochromatic toner image is formed onto the surface of photoconductor drum 1.Four imaging units 11Y, M, C, K are respectively provided with use The developing apparatus 5 of single composition developer.In addition, the toning in the developer used in each imaging unit 11 is only included in The color of agent is different, and other basic compositions are all roughly the same, so in the following description, especially not needing to specific face When color or configuration, just omit Y, M, C, the symbol of K illustrates.In addition, the symbol of the member of formation for each imaging unit 11, is The symbol of imaging unit 11K with reference to shown in Fig. 1 illustrates.

Photoconductor drum 1 is after by 2 uniform charged of charging unit, by the exposure of exposure device 3, come to being formed in its table Electrostatic latent image on face carries out the latent image carrier of mounting conveyance.In addition, and at primary transfer portion 22 into being transferred to Between in transfer belt 21 until the electrostatic latent image formed on the surface loaded by the toner image that developing apparatus 5 develops The image-carrier of conveyance.Then, pass through the rotary driving force for the photoreceptor drive motor for being used as latent image carrier drive motor, the sense Body of light drum 1 is just turned round (around movement).

Set in the printer 200 there are two photoreceptor drive motor, one be by means of gear row come revolution driving into The other revolving bodies included as the photoconductor drum 1 and imaging unit 11K of unit 11K.In addition, other imaging units 11Y, M, C by means of gear arrange and in each imaging unit 11 transmit have rotary driving force while, also further by means of tooth Rotary driving force is transmitted in each photoconductor drum 1 and other revolving bodies by wheel row.In addition, in the printer 200, although Be respectively provided with as driving intermediate transfer belt 21 transfer member drive motor band drive motor and photoconductor drum 1 is carried out The photoreceptor drive motor of driving, but same motor can also be used by means of gear row or clutch mechanism.

Around photoconductor drum 1, as illustrated in fig. 1, using have the left oblique upper for being configured in photoconductor drum 1 as The charging unit 2 of the charging roller of charging mechanism is starting point, and imaging unit 11 is configured with successively by gyratory directions clockwise in figure Each member of formation.What is be configured is charging unit 2, the exposure device 3 as exposure mechanism, the developing apparatus as developing mechanism 5th, as the primary transfer portion 22 of transfer means, the photoreceptor cleaning device 7 as latent image carrier cleaning mechanism.Here, one Include the intermediate transfer belt for being transferred component that primary transfer portion 22 is both also served as its transfer member in secondary transfer section 22 21 and it is opposite by means of intermediate transfer belt 21 and photoconductor drum 1 and to being configured and as the primary transfer roller 9 of application component.

Charging unit 2 is with the charging high voltage power supply being connected as a power supply mechanism (with reference to Fig. 2) The contact-type charger of the charging roller of roll shape.Charging roller is on one side as the revolution of photoconductor drum 1 (surrounding movement) is done driven time Turn, the charging bias applied on one side by being supplied to the electric power in charging unit 2 from charging high voltage power supply makes photoconductor drum 1 Surface uniform charged is the current potential of the negative polarity of such as -500V.Charging bias is DC or the voltage after AC is overlapped on DC.

Exposure device 3 according to the external mechanical from the personal computer being connected in printer 200 etc. come image data, Come uniform to laser beam scanner or LED (LightEmittingDiode) array by using laser diode 1 surface of photoconductor drum of electrification is exposed.As a result, just electrostatic latent image is formd on 1 surface of photoconductor drum.Specifically It is to be exposed according to image data come the photoconductor drum 1 to uniform charged.So as to realize by by the surface of exposure portion The current potential of the negative polarity of such as -50V is reduced to form electrostatic latent image, and electrification is adhered to for negative polarity by developing apparatus 5 Toner positive and negative (negative-positive) mode development.Exposure device 3 also has from photoconductor drum 1 to transfer In unit 20 as the transfer of the toner image of the intermediate transfer belt of transfer printing body 21 after or formed electrostatic latent image it It is preceding to remove motor structure to what 1 surface of photoconductor drum was de-energized.

Developing apparatus 5 be the opening portion with the never developer container of label symbol start it is opposite with photoconductor drum 1 and Expose the single component development of a part and the supply roller as the developer roll 6 of developer carrier body and without label symbol over the ground The developing apparatus of mode.Be further provided with being installed in the gyratory directions upstream side of the developer roll 6 of the opening portion of developer container and As developer layer thickness regulating member limit thickness scraper plate and be installed in the end for being not provided with the opening portion for limiting thick scraper plate The component into mouthful seal, blender etc..Then, it is formed on 1 surface of photoconductor drum by the exposure of exposure device 3 In electrostatic latent image, it is opposite to photoconductor drum 1 and developer roll 6 and to developing location until, load conveyance included in by developer roll 6 Developer in toner attachment after as toner image carry out visual image (development).

It is exactly specifically in developer container, to pass through the stirring of supply roller and blender and the mounting conveyance of developed roller Friction during regulation limitation is carried out to thickness by the thick scraper plate of limit, the toner in developer will be charged as cathode Property.Then, the electric power being supplied in developing apparatus 5 by the development high voltage power supply 125 of Fig. 2 from one of power supply mechanism exists Apply developing bias on developer roll 6, and developing position cause it is opposite with photoconductor drum 1 and to developer roll 6 surface band Current potential of the electricity for the negative polarity of such as -200V.Charging by doing so, photoconductor drum 1 is as under the surface potential of electrostatic latent image The current potential of exposure portion after drop is for example by such as+150V of the potential difference of -50V, from 6 surface of developer roll by the tune of negative polarity Adhered on the electrostatic latent image that toner is moved on photoconductor drum 1.Toner will be explained below.In developing apparatus 5 Top be configured with the developer that contains and can replace, and link with developing apparatus 5 and later fill developer replenishing to development Put the toner replenishing container 4 in 5 developer container.In the present embodiment, it is that will directly adjust shown in toner replenishing container 4 Toner is fed to the composition in developer container, but setting can also feed path by toner replenishing in device body 100 Composition into developer container.

Photoreceptor cleaning device 7 includes the photoreceptor clean box of no sign flag and to not from photoconductor drum 1 The toner for being transferred in intermediate transfer belt 21 and remaining on photoconductor drum 1 hug take come remove and as cleaning The cleaning blade 8 of component.In addition, be additionally provided with the remaining toner of removing is transported to it is residual in the one end of photoreceptor clean box Toner is stayed to transport screw rod, be transported to the remaining toner of one end by the conveyance hose that is connect with waste-toner container and Coil pipe in hose and transported in waste-toner container.Waste-toner container is arranged to relative to device body 100 can be with Handling are equipped with the sensor being detected to the useless toner amount accommodated in device body 100, are more than regulation when detecting It is just the discard instruction for representing useless toner in the display panel of operation portion (with reference to Fig. 2) during the receiving of the useless toner of amount.

Transfer unit 20 includes four primary transfer portions 22Y, M, C, K and secondary transfer section 23 and intermediate transfer belt 21 Deng.In addition, the contact separation mechanism 29 for the track for changing intermediate transfer belt 21 is additionally provided with, to cause when full-color image is formed Each photoconductor drum 1 of intermediate transfer belt and imaging unit 11Y, M, C, K contacts, and causes intermediate transfer when black white image is formed Band is only contacted with the photoconductor drum 1K of imaging unit 11K.In addition, it is additionally provided with the band sanitizer cartridge as middle transfer body cleaning device Put 27 or optical sensor 28.

Intermediate transfer belt 21 is to surround mobile middle transfer body, with as the transfer structure in each primary transfer portion 22 While the function of part and transfer printing body or with as the transfer article in the secondary transfer section 23 of secondary transfer printing mechanism The image-carrier of function.Then, intermediate transfer belt 21 is also used as the transfer driven roller of secondary transfer printing counter roll by right side in figure 24 and figure in left side make the idler roller 26 of driven revolution be tensioned set up.

Each photoconductor drum 1 of each imaging unit 11 between transfer driven roller 24 and idler roller 26 is in opposite directions and to side Inner circumferential in be also configured with following revolving body.Primary transfer roller 9, the band cleaning device 27 having in each primary transfer portion 22 Cleaning opposed roller 27b and separate three support roller 29a, b, c being equipped in mechanism.These revolving bodies are turned from centre The moving direction upstream side of print band 21 starts to be configured with cleaning opposed roller 27b, support roller 29a, primary transfer roller 9Y, primary successively Transfer roll 9M, primary transfer roller 9C, support roller 29b, primary transfer roller 9K and support roller 29c.

Intermediate transfer belt 21 is also used as the transfer driven roller 24 of secondary transfer printing counter roll and a left side in figure by right side in figure Side make the idler roller 26 of driven revolution be tensioned set up, and by by with drive motor come the transfer driven roller 24 of revolution driving Revolution and counterclockwise side is up around movement in figure.Idler roller 26 with the action for separateing mechanism 29 by changing After its track, to absorb the flexible of flexible intermediate transfer belt 21.Transferring the driving source of driven roller 24 and imaging unit 1 both can be with It can also be independently common to be.It is to open simultaneously since the driving of imaging unit 1 and the transfer of transfer driven roller 24 drive more It is dynamic and close, so, for the miniaturization of ontology or cost effective, it is preferred that the driving and transfer of imaging unit 1 The transfer of driven roller 24 is driven to common.It is in roller by spring come idler roller 26 as transfer belt tensioning erecting device It pressurizes two axis sides.

In addition, the track of intermediate transfer belt 21 carries out following variation according to the action for separateing mechanism 29. During full-color image formation, each primary transfer roller 9 contacted with intermediate transfer belt 21 and the vertex of three support roller 29a, b, c Height of the portion in figure in upper and lower directions is higher than the apex of transfer driven roller 24, idler roller 26 and cleaning opposed roller 27b. Be higher by by this, it is opposite with each photoconductor drum 1 between transfer driven roller 24 and idler roller 26 and to intermediate transfer belt 21 Track just become between support roller 29a and support roller 29c prominent, intermediate transfer belt 21 and photoconductor drum 1Y, M upward, The track of C, K contact.

When single color printing acts, the support roller 29b, primary transfer roller 9K and the support roller that are contacted with intermediate transfer belt 21 Height of the apex of 29c in figure in upper and lower directions is higher than other revolutions contacted from the inner circumferential side of intermediate transfer belt 21 The apex of body.It is higher by by this, between transfer driven roller 24 and idler roller 26 with each photoconductor drum 1 in opposite directions and in Between transfer belt 21 track just become between support roller 29b and support roller 29c upward prominent, intermediate transfer belt 21 only with sense The track of body of light drum 1K contacts.

In addition, each photoconductor drum 1 of imaging unit 11Y, M, C, K in figure counterclockwise side up around mobile In the figure of intermediate transfer belt 21 above developed surface opposite, from the circular moving direction upstream side of intermediate transfer belt 21 Start, according to Y, M, C, the sequence of K is configured each imaging unit 11.Each imaging unit 11 is configured by doing so, in full color When printing acts, since each photoconductor drum 1 of each imaging unit 11, overlappingly once turned corresponding to assorted toner image Intermediate transfer belt 21 is printed to, and forms the toner image of (mounting) full color.

On the other hand, when single color printing acts, since the photoconductor drum 1K of imaging unit 11K, corresponding to black Toner image is transferred on intermediate transfer belt 21, and forms the toner image of (mounting) monochrome.At this moment, it is other into Each photoconductor drum 1 of picture unit 11Y, M, C as described above, leave intermediate transfer belt 21.Therefore, it will be able to stop these The meaningless circular movement of photoconductor drum 1 extends its service life or reduces the consumption electric power of imaging unit 11Y, M, C.

Primary transfer roller 9 uses diameterSponge roller to be formed, and be adjusted to 10 using resistance value⁶- 10⁸The ionic conductivity roller (urethanes+carbon dispersion, NBR, epichlorohydrin rubber) of Ω or the roller (EPDM) of electron conductive type Deng.As the material that intermediate transfer belt 21 uses, can use in PVDF (Kynoar), (ethylene-tetrafluoroethylene is common by ETFE Polymers), PI (polyimides), PC (makrolon), the conductive material for having disperseed carbon black etc. in TPE (thermoplastic elastomer (TPE)) etc. And as the endless belt of resin film material shape.In the later-described embodiments, it is by being 1000-2000Mpa in tensile elasticity rate The composition of the monolayer constructions after carbon black is added in TPE to use the intermediate transfer belt that thickness is 230mm for 90-160 μm, width. In addition, it is used in the environment of 23 DEG C of 50%RH as resistance, volume resistivity 10⁸-10¹¹Ω cm, surface impedance Rate is 10⁸-10¹¹Ω/ (is to be measured by the HirestaUPMCP-HT450 that Mitsubishi Chemical Ind manufactures, applying voltage is 500V, application time be 10 seconds) material.Primary transfer roller 9 is being transferred the conduct in transfer unit 20 from photoconductor drum 1 After the transfer of the toner image of the intermediate transfer belt 21 of body, before electrostatic latent image next time is formed, with above-mentioned exposure machine Structure also has the function of to remove motor structure as 1 surface of photoconductor drum is de-energized together.

Primary transfer portion 22 is the transfer member for carrying out primary transfer, is included with photoconductor drum 1 in opposite directions and to matching It puts and is used as the intermediate transfer belt 21 of transfer printing body and applies the voltage for carrying out primary transfer on intermediate transfer belt 21 Primary transfer bias and be used as application component primary transfer roller 9.In primary transfer roller 9, it is connected with as power supply machine The primary transfer high voltage power supply 122 of Fig. 2 of one of structure, and the electric power by coming from the supply of primary transfer high voltage power supply is at intermediate turn Print primary transfer bias (such as voltage in the range of+100 to+2000V) as defined in applying in band 21.Then so that with sense Body of light drum 1 it is opposite and to intermediate transfer belt 21 current potential of the surface electrification for positive polarity, by with the electrostatic on photoconductor drum 1 The potential difference of the current potential of sub-image is come after forming transfer electric field, by the toner image of negative polarity from photoconductor drum 1 is transferred to Between in transfer belt 21.

Band separate mechanism 29 and includes there are three support roller 29a, b, c and movable frame 29d, keeps frame 29e, conduct The eccentric cam 29f of the orbit modification mechanism of intermediate transfer belt 21, cam rotating shaft 29g, intermediate transfer separate clutch 29h etc..

Support roller 29a in support roller 29a, b, c is configured between band cleaning device 27 and primary transfer roller 9Y, is supported Roller 29b is configured between primary transfer roller 9C and primary transfer roller 9K, and support roller 29c is configured in primary transfer roller 9K and opens Between tight roller 26.

Movable frame 29d is by be arranged to one end side rotary as fulcrum using the rotating shaft of support roller 29a Meanwhile it is protected from both sides by the rotating shaft of support roller 29a, primary transfer roller 9Y, primary transfer roller 9M and primary transfer roller 9C Hold what two blocks of side plates freely to turn round were formed.

Frame 29e is kept to also serve as the holding frame of transfer unit 20, is mainly made of two lateral plate members.Then, in addition to It is maintained at support roller 29a in movable frame 29d, primary transfer roller 9Y, primary transfer roller 9M and primary freely to rotate Other than transfer roll 9C, the revolving body of transfer unit 20 is remained freely turn round while, also keep transfer unit 20 its His member of formation.

Secondary transfer section 23 has by means of above-mentioned intermediate transfer belt 21, transfer driven roller 24 and intermediate transfer belt 21 It is opposite configured with transfer driven roller 24, and comes together use of the clamping conveyance as recording medium with intermediate transfer belt 21 Paper P and secondary transfer roller 25 as secondary transfer printing component etc..

Polyurethane rubber (thickness 0.3-1.0mm), shallow layer roller (thickness 0.03- can be used by transferring driven roller 24 0.1mm) etc..It is (thick as used in the present embodiment being that diameter change varies with temperature smaller urethanes applicator roll It spends for 0.05mm, diameterFor 19mm).10 also lower than secondary transfer roller 25 are set at as resistance value⁶Below Ω.

Secondary transfer roller 25 is a diameter ofSponge roller, and be adjusted to 10 using resistance value⁶-10⁸Ω Ionic conductivity roller (urethanes+carbon dispersion, NBR, epichlorohydrin rubber) or electron conductive type roller (EPDM) etc..When two Since the flowing of electric current becomes difficult when the resistance value of secondary transfer roll 25 is more than above range, in order to obtain required transferability, Higher voltage must just be applied, thus can incur the increase of power supply cost.Due to needing to apply high voltage, clamped in transfer section Front and rear gap can cause electric discharge, and the blank spot caused by electric discharge will occur on half tone image.This is in low temperature and low humidity It is especially pronounced under environment (such as 10 DEG C of l, 15%RH).Conversely speaking, when the resistance value of secondary transfer roller 25 is less than above range When, existing multiple color image portion (such as three colors overlapping image) and the transferability of monochrome image cannot on the same image Enough two is vertical.This is because when transferring monochrome image portion, enough electric current flowings are had relatively low voltage.Because The voltage value higher than the optimum voltage in monochrome image portion is needed when transferring multiple color image portion, and is set as to transfer more During the voltage in kind color image portion, the Transfer current in monochrome image can reduction that is superfluous and leading to transfer efficiency.It is primary to turn The measure for printing the resistance value of roller 9 and secondary transfer roller 25 is that roller is set in the metallic plate of electric conductivity, and in plug both ends part Shi Jia in the state of the unilateral load for 4.9N, from the voltage for applying 1kV between plug and metallic plate when the electric current that flows through Value calculates.

In secondary transfer roller 25, it is connected with the secondary transfer printing high voltage power supply as Fig. 2 of one of power supply mechanism 123, transfer driven roller 24 is grounded, and the surface potential in the secondary transfer printing clamping part of intermediate transfer belt 21 is near 0V.It is corresponding In the toner image on the intermediate transfer belt 21 by opportunity of secondary transfer printing clamping part for being formed together with secondary transfer roller 25, It is fed electrical power in secondary transfer section 23 from secondary transfer printing high voltage power supply so that the secondary transfer printing bias of defined positive polarity It is applied in secondary transfer roller 25.In addition, corresponding to the opportunity, the secondary transfer section 23 and sheet feed section 40 of transport path 50 it Between contraposition roller to 51 by revolution driving and by 40 paper supply of sheet feed section come paper P be transported in secondary transfer printing clamping part.

Then, by being turned by the surface potential of secondary transfer roller 25 and the centre near 0V of secondary transfer printing bias electrification The potential difference between the surface potential of band 21 is printed, the paper P moved and intermediate turn are just clamped in secondary transfer printing clamping part Secondary transfer printing electric field is formd between print band 21.By the secondary transfer printing electric field, the toner image on intermediate transfer belt 21 just exists Secondary transfer printing clamping part is transferred secondarily to on paper P.

Include the band clean box that does not assign symbol with cleaning device 27 and to 21 surface of intermediate transfer belt not by two It is secondary transfer and remaining remaining toner or accompanying additive are removed and as the band of middle transfer body cleaning element Cleaning blade 27a.In addition, it is additionally provided with the conveyance coil pipe 27c for transporting remaining toner etc. and connect band clean box and useless toning The conveyance hose of agent container and across intermediate transfer belt 21 and with cleaning blade 27a it is opposite and to metal cleansing phase Two pairs of rollers 27b.Then, the cleaning opposed roller 27b with cleaning device 27 is configured in the intermediate transfer belt close to transfer driven roller 24 In the position in 21 moving direction downstream side.Conveyance coil pipe 27c is run through in conveyance hose, will be scraped by turning round by band cleaning Remaining toner that plate 27a is removed etc. is transported in waste-toner container.Waste-toner container and contain it is clear by photoreceptor The container of the remaining toner that clean device 7 removes etc. is same container.

Optical sensor 28 is configured as coming from outside opposite with the intermediate transfer belt 21 by the tensioning erection of idler roller 26 It is and right.The optical sensor 28 be to the adhesion amount of toner (toner image) being transferred on intermediate transfer belt 21 with And assorted position is measured and is used for image color or the sensor of position alignment, is to normal reflection and scattered reflection mode It is composed.

Fixing section 30 is to being transferred secondarily to the toning used on paper P at the secondary transfer section 23 of above-mentioned transfer unit 20 The heating pressurization of agent picture is fixed to on paper P later.The fixing section 30 have in 23 toner image of secondary transfer section by secondary turn One side contacts of print and the fixing roller 31 that heats and it is opposite with the fixing roller 31 and to postpone to be formed fixing nip portion and and The pressure roller 32 that fixing roller 31 pressurizes while conveyance is clamped with paper P together.

Paper discharge unit 52 by fixing section 30 by heating pressurization come the paper P that toner image is fixed from device It is discharged in ontology 100 in the mounting pan portion 71 on the top for being formed in framework 101.Then, equipped with from being formed in framework 101 Ejection port 53 will clamp the exit roller for transporting and discharging to 54 with paper P.

Sheet feed section 40 store multipage paper P while, also have be equivalent to device body 100 (sheet feed section 40) be can It is detached page by page with the paper P in paper card box 41 with handling paper card box 41 and will be accommodated in and is supplied to conveyance Paper feed roller 42 and separate roller 43 in path 50.The paper P that transport path 50 is used to supply sheet feed section 40 is transported to transfer In the secondary transfer section 23 of unit 20, fixing section 30 and paper discharge unit 52, equipped with positioned at the paper sheet delivery side of secondary transfer section 23 Contraposition roller in the upstream side is to 51 and multiple carrying rollers pair.

Paper P as transfer materials is placed on in paper card box 41 or manual paper feeding mouth, passes through paper feed roller 42, contraposition Roller is supplied corresponding to the opportunity of the toner image leading end portion arrival secondary transfer position on 21 surface of intermediate transfer belt 51 etc. Paper.Secondary transfer printing biases as defined in being applied by the secondary transfer printing high voltage power supply 123 of Fig. 2, the toning on intermediate transfer belt 21 Agent image has been transferred to on paper P.Paper supply is using longitudinal path.With paper P by the curvature of secondary transfer roller 25 come from Intermediate transfer belt 21 detaches, and after being transferred to and being fixed with the toner image on paper P by fixing section 30, from ejection port 53 Discharge.Transfer modes have following two.Namely the inclined of the inner application positive polarity of secondary transfer roller 25 is biased in as secondary transfer printing It presses and forms the gravitation transfer modes of secondary transfer printing electric field by transferring the ground connection of driven roller 24 and transferring in driven roller 24 Apply the bias of negative polarity and the repulsion transfer modes of secondary transfer printing electric field are formed by the ground connection of secondary transfer roller 25.At this Using gravitation transfer modes in embodiment, and apply by being used as transfer bias during paper by stabling current control The electric current of+5-100 μ A.

In addition, it is that statue processing speed is changed according to the type of the paper P of transfer materials.It is exactly specifically, The use of level ground weight is 100g/m²During above paper P, statue processing speed is allowed for as half, is needed by transfer materials Twice of the time of common statue processing speed passes through the fixing nip portion being made of fixing roller, it will be able to ensure toner The fixation performance of image.

Main control section 110 is used for the required each portion of action control and institute of each portion to being set in device body 100 The action of some devices etc. is controlled.For main control section 110, illustrate with reference to Fig. 2.

It is the definition graph of the control system of printer 200 shown in Fig. 2.As illustrated in fig. 2, main control section 110 includes Central calculation processing unit (CPU) 111 and by ROM112 and the RAM113 memory formed and the I/O ends for input and output Mouth 114,115 etc..In addition, I/O ports 114 and operation portion 116 connect.I/O ports 115 and with paper position detecting mechanism 117, temperature It spends humidity sensor 118, photoreceptor drive motor 119, band drive motor 120, intermediate transfer and separate clutch 121, one Secondary transfer high voltage power supply 122, secondary transfer printing high voltage power supply 123, charging high voltage power supply 124, development high voltage power supply 125, LED array 126 grades connect.

The position of paper P calculating the opportunity turned round since the contraposition roller of Fig. 1 is to 51 with paper position detecting mechanism 117 It puts.In addition, the environmental data in 118 acquisition device ontology 100 of humidity temperature pickup.In addition, intermediate transfer separate from Clutch 121 as described above, switches over the track of intermediate transfer belt 21 when black white image is formed, so that other colors Imaging unit 11 in each photoconductor drum 1 and intermediate transfer belt 21 separate.

In present embodiment as described above, in the string for the intermediate transfer belt 21 for being employed as band-like middle transfer body In the printer 200 of column intermediate transfer mode, although illustrated for being applicable in the present invention, the present invention does not limit to In such composition.For example, it is also possible to band-like transfer conveyance body is suitable as to use the tandem of transfer conveyor belt straight It connects transfer modes or corresponds to list using the revolving body of transfer roll etc. as transfer member come what is used as transfer conveyance component The image forming apparatus of color.

In addition, the present invention is in the printer with the developing apparatus 5 that single composition developer is used in each imaging unit 11 In 200, although come what is illustrated for being applicable in the present invention, the invention is not limited in such compositions.For example, it is also possible to Suitable for having in each imaging unit using the image forming apparatus of the developing apparatus of tow-component developer.

Then, the single color printing action sequence of previous image forming apparatus is illustrated.

It is the opportunity flow chart of the single color printing action sequence of previous image forming apparatus shown in Fig. 3.It is into shown in Fig. 4 As unit 11 and the amplification synoptic diagram of transfer unit 20.Drive motor shown in Fig. 3 is the photoconductor drum 1 of imaging unit 11 and turns Print the common driving source of driven roller 24.

In previous image forming apparatus, when starting printing action, first start the driving of drive motor, when by filling The charging place of electric installation 2 and in the development that developing apparatus 5 is reached by the photosensitive body portion of uniform charged state (- 600V) During until point, by the photosensitive body portion under uniform charged state sometimes by developing ground when last printing acts Point.

At this moment, in this period, if the photosensitive body portion for passing through place of developing is equal when being last printing action The state of even electrification and it is constant, toner would not be moved from developing mechanism to photoreceptor.But it is moved from upper primary printing Make start for a long time place later start printing action when, by the photoreceptor in place of developing partly because potential decay just becomes 0V.At this moment, when applying the developing bias of developing mechanism, toner will be moved from developing mechanism to photoreceptor.As a result, meeting Generate meaningless toner consumption.

On the other hand, as this meaningless toner inhibited after being placed for a long time since last printing action The method of the generation of consumption is in printing action this time, in the photoreceptor that electriferous state is in by charging unit 2 It is the developing bias for not applying developing apparatus 5 during part is until by place of developing.However, in this approach, It, will be during above-mentioned by aobvious if starting printing action in a short time since terminating last printing action The carrier for positive polarity will be charged towards photosensitive by being formed between the photosensitive body portion (- 600V) of image device 5 and developing mechanism (0V) The highfield that side attracts.Therefore carrier attachment will be led to the problem of.

Then, in the single color printing action sequence of previous image forming apparatus, to stopping at the end of printing acts It is to revolve one-turn photoconductor drum 1 mostly later so that the full surface of photoreceptor is in removes electricity by exposing before drive motor State.It is exactly specifically for example, when the instruction that the monochromatic printing of black starts action is sent out, the developing bias of Fig. 3 and to fill It begins to output during t0 at the time of electrical bias is before the driving for starting drive motor.The charging roller 2a of the charging unit 2 of Fig. 1 On one side as driven revolution is done in the revolution of photoconductor drum 1 (surrounding movement), on one side by being supplied from the charging high voltage power supply 124 of Fig. 2 The charging bias for the negative polarity for being given to the electric power in charging unit 2 to apply, it is negative polarity to make 1 surface uniform charged of photoconductor drum Current potential.In the developer roll 6 of the developing apparatus 5 of Fig. 1, by from the development high voltage power supply 125 of Fig. 2 supply come electric power applied The developing bias of the positive polarity added, to cause current potential of the surface of developer roll 6 electrification for positive polarity.Developing bias from driving horse At the time of t2 has begun to pass through time T10 (=(L1+L2)/V) at the time of the opportunity of driving stabilization reached in t3, start from anode The output for being outputted to negative polarity of property.Then, since moment t4 so that it is opposite with photoconductor drum 1 and to developer roll 6 Surface electrification for negative polarity current potential.As illustrated in fig. 4, L1 be from charging clamping part (charging place) until exposure location Distance, L2 is the distance until exposure location to development clamping part (development place).V is the peripheral speed of photoconductor drum 1. The T1 of Fig. 3 is that the output of developing bias reaches the stable time, and T2 is that the output of charging bias reaches the stable time.T6 is L2/V。

Drive motor shown in Fig. 3 is with the output stabilization time T1 of the developing bias and output stabilization time T2 of charging bias In opportunity of the longer side as triggering at the time of t1 start to drive.The driving of drive motor stops being the exposure dress from Fig. 1 T9 starts at the time of putting for 3 opportunity when removing electricity end exposure.The T3 of Fig. 3 is the opportunity from the driving for starting drive motor At the time of t1 to photoconductor drum 1 or transfer driven roller 24 gyrostabilized platform when opportunity at the time of t2 until time.T7 be from The driving of drive motor stops times of the t9 at the time of opportunity stopped until t10 at the time of the opportunity started.

T2 have passed through rule at the time of primary transfer bias shown in Fig. 3 is the opportunity when stablizing from the driving of drive motor At the time of after fixed time T4 in t4, since the primary transfer high voltage power supply 122 of Fig. 2 be supplied to primary transfer roller 9 it is inner after it is defeated Go out (such as+1000V).T9 at the time of opportunity of the exposure device 3 except electricity end exposure, starts to stop transfer bias Output.The T4 of Fig. 3 is that the revolution of photoconductor drum 1 reaches the transfer folder of primary transfer roller 9 since the charging place of charging unit 2 The required time until holding portion.

Secondary transfer printing bias shown in Fig. 3 is the opportunity exposed from the printing started corresponding to aftermentioned print data Moment t5 in t6, is supplied to from the secondary transfer printing high voltage power supply 123 of Fig. 2 in secondary transfer roller 25 at the time of have passed through time T5 To start the output of positive polarity.Later, stop what secondary transfer printing biased in t7 at the time of the opportunity stopped with exposure is printed Output.The T5 of Fig. 3 be as shown in phantom in figure 4 path like that in Fig. 4 of photoconductor drum 1 in the revolution of arrow direction, The transfer nip required time of primary transfer roller 9 is reached by the photosensitive body portion after the exposure location of exposure mechanism, With in the revolution of intermediate transfer belt 21, pass through the photosensitive body portion behind the transfer place of the transfer nip of primary transfer roller 9 Reach the sum of the transfer nip required time of secondary transfer roller 25.The opportunity that the output of secondary transfer printing bias stops both may be used To be performed on opportunity for being exposed except electricity, it may correspond to be configured in paper position inspection of the contraposition roller to Fig. 2 near 51 Mechanism 117 is surveyed to performing by detection opportunity with paper apex/rear end.

There is the photoconductor drum corresponding to the printing exposure of print data and to Fig. 1 in the exposure of the exposure device 3 of Fig. 1 1 surface be de-energized except two kinds of electricity exposure etc., except it is electric with expose be with carrying out comprehensive black print when similarly expose.Into Row except the time of electricity exposure be comparable to photoconductor drum 1 remove electric time T20 comprehensively, time T20 can with L3/V come It represents.L3 is the perimeter of photoconductor drum 1, and V is the peripheral speed of photoconductor drum 1.At the end of printing acts, pass through drive motor Driving cause the photoconductor drum 1 to make being de-energized around moving through exposure more than one week so that entirely photosensitive Dignity is except the state after electricity.As a result, when starting subsequent printings action, the photosensitive body portion in uniform charged state exists During until the development place of arrival developing apparatus 5, the photosensitive body portion by the development place of developing apparatus 5 is except electricity State, so the toner attachment to the photosensitive body portion and carrier attachment can be inhibited.

The photoconductor drum 1 when machine stops if in drive motor at the beginning of electricity exposes that removes of photoconductor drum 1 is surround Mobile once week, mostly there is no problem, it is not necessary to the output of alignment secondary transfer printing bias be gone to stop (OFF) opportunity.For example, The electricity that removes for starting photoconductor drum 1 in secondary transfer printing bias output exposes.In the photoreceptor of the exposure location by exposure device 3 During part is arrived again at until exposure location, that is to say, that by the circular movement more than one week of photoconductor drum 1, as long as Start the stopping of drive motor at the opportunity all completed except electricity of photoconductor drum 1 comprehensively.Stopping as drive motor At the beginning of machine have following situation.The toner remained in after secondary transfer printing in transfer belt is cleaned by the photoreceptor of Fig. 1 Situation about starting after being removed in device 7 as the photoreceptor cleaning blade 8 of cleaning element.If the photoconductor drum 1 of Fig. 1 turns The driving mechanism of print driven roller 24 also also serves as the driving mechanism of fixing section 30, only if it were not for transfer materials rear end passes through by fixing section The fixing nip portion that 30 fixing roller 31 and pressure roller 32 is formed cannot drive the situation of stopping.

Then, the full color of previous image forming apparatus printing action sequence is illustrated.

It is as the exposure corresponding to print data as the action different from single color printing action sequence shown in Fig. 3 At the time of the opportunity of the printing exposure of mechanism in t5- moment t8, be staggered to each color time T8 shown in fig. 5.By This, is overlapped assorted toner image in the intermediate transfer belt 21 of Fig. 1.Then, it is opened in secondary transfer printing bias output Beginning imaging unit 11Y, M, C, the electricity that removes of each photoconductor drum 1 of K expose.Pass through the photoreceptor after the exposure location of exposure mechanism Part arrives again at exposure location, and by photoconductor drum 1 around it is mobile more than one week it is rear cause each photoconductor drum 1 it is comprehensive all in Except the state of electricity.The T8 of Fig. 5 is the primary transfer clamping of the mobile adjacent imaging unit of a certain position revolution of intermediate transfer belt 21 Interval (such as 80mm) the required time between portion.

As described above, in the electricity removing of photoreceptor in previous image forming apparatus, tied because being acted in printing Be during beam so that photoconductor drum around it is mobile more than one week after the comprehensive of photoconductor drum is exposed, so, simply because the exposure And photoconductor drum is turned round more than one week more.The problem of service life that its result has led to driving mechanism shortens.As solution The certainly method of the problem points, it is proposed that the present embodiment being discussed further below latent image carrier remove method for electrically.

In the following, the single color printing action sequence of the image forming apparatus of present embodiment is illustrated.

It is the opportunity flow chart of the single color printing action sequence of the image forming apparatus of present embodiment shown in Fig. 6.Fig. 7 institutes Show the ideograph of the electricity removing for the photoconductor drum for being present embodiment.

In single color printing action sequence in the image forming apparatus of present embodiment shown in Fig. 6, tied when printing acts Shu Shi, it is just shown as shown in Figure 7 (a), it is come to being located at exposure by exposure device 3 when the driving of drive motor stops After photosensitive body portion between the exposure location of device 3 and the development place of developing apparatus 5 is exposed, stop drive motor Driving.The photoreceptor portion in the region until exposure location to place of developing (region shown in the range A in Fig. 7 (a)) as a result, (first) is divided to be at by the state except electricity.Printing act start when, be start drive motor driving opportunity when Carve t1 in, before the driving of drive motor positioned at charging unit 2 charging place photoreceptor drive motor driving it Period until the exposure location of rotation arrival exposure device 3 afterwards, by exposure device 3 come to being exposed on photoreceptor.As a result, The photosensitive body portion (second) in the region (region shown in the range B in Fig. 7 (b)) until place to exposure location of charging is with regard to from In by the state except electricity.Electricity is removed with this simultaneously, passes through region (the range C in Fig. 7 (b) of the photosensitive body portion of charging unit 2 Shown region) in by the state of uniform charged.

It is exactly specifically when starting printing action, is the output stabilization time T1 and charging bias in developing bias It exports at the time of a longer side is as the opportunity triggered in stabilization time T2 in t1, while the driving for starting drive motor, Also start (ON) exposure device 3.L1/V (=T30) is being begun to pass through from t2 at the time of being driven to stable opportunity of drive motor Stop exposing except electricity in t3 at the time of time.As a result, pass through charging unit 2 charging place photosensitive body portion to Up to exposure device 3 exposure location until during, exposed by exposure device 3.As a result, from the charging of charging unit 2 The photosensitive body portion in region (range B in Fig. 7 (b) shown in region) of the point until exposure location is at by the shape except electricity State.Although t1 is but it is also possible to be driving horse at the time of the opportunity that the driving that the startup opportunity of exposure device 3 is drive motor starts What is reached is driven to t2 at the time of stable opportunity.The electricity exposure that removes before printing action starts is performed, and monochromatic print At the end of swiping work, just secondary transfer printing bias output stop (OFF) opportunity at the time of t8 in start except electricity be exposed on from Stop exposing except electricity in t10 at the time of moment t8 begins to pass through the opportunity of L2/V (=T40) times.As a result, pass through exposure The photosensitive body portion in light place reach developing apparatus 5 development place until during in because exposure device 3 exposure, from The photosensitive body portion in the region (region shown in the range A in Fig. 7 (a)) until exposure location to place of developing is at by except electricity State.

In the following, the full color printing action sequence of the image forming apparatus of present embodiment is illustrated.

It is the opportunity flow chart of the full color printing action sequence of the image forming apparatus of present embodiment shown in Fig. 8. It is to drive in each imaging unit in full color printing action sequence in the image forming apparatus of present embodiment shown in Fig. 8 Being driven to of dynamic motor starts (ON) exposure device 3 in t2 at the time of stable opportunity.Later, filling by charging unit 2 The photosensitive body portion in electric place have passed through since place of charging reach exposure location until during L1/V (=T30) when Between opportunity at the time of t3 in, stop except electricity exposure.As a result, it is located at charging unit 2 before the driving of drive motor During the photoreceptor in charging place is rotated after the driving of drive motor until the exposure location for reaching exposure device 3, it is By exposure device 3 come to being exposed on photoreceptor.Region (Fig. 7 until place to exposure location of charging as a result, (b) region shown in the range B in) each photosensitive body portion be just respectively at by except electricity state.The driving of drive motor starts Preceding is performed except electricity exposes, and at the end of full color printing acts, and stops (OFF) in the output of secondary transfer printing bias Start in t11 at the time of opportunity except electricity be exposed on from moment t11 begin to pass through the opportunity of L2/V (=T40) times at the time of Stop exposing except electricity in t13.As a result, when the driving of drive motor stops, being aligned by exposure device 3 After photosensitive body portion between the exposure location of exposure device 3 and the development place of developing apparatus 5 is exposed, stop driving The driving of dynamic motor.Region until exposure location to place of developing (region shown in the range A in Fig. 7 (a)) as a result, it is each Photosensitive body portion is just respectively at by the state except electricity.

According to present embodiment as described above, when starting printing action, it is located at before the driving of drive motor and exposes Photosensitive body portion between light place and development place is when upper primary printing acts end in by the state except electricity. When starting printing action, the photosensitive body portion being located at before the driving of drive motor between charging place and exposure location is Drive motor is driven when printing this time is acted and started and is in after being exposed by exposure device by the state except electricity. When starting printing action, the sense that photoreceptor gyratory directions upstream side is more leaned on than charging place is located at before drive motor driving It body of light part, can be by charging unit and in by the state of uniform charged when starting the action of printing this time.It is tied Fruit is, when printing acts beginning, when the printing is acted by charging unit by the photosensitive body portion under uniform charged state During reaching until development place, it can be in by the state except electricity by the photosensitive body portion in the development place.It is printing At the end of action, in order to photoreceptor is de-energized and it is required that photoreceptor revolution displacement distance be exposure location and development Displacement distance between place.Therefore, in order to which photoconductor drum causes photoconductor drum revolution except electricity at the end of being acted with printing Previous image forming apparatus more than one week is compared, it will be able to be shortened the driving time of drive motor and be extended the longevity of drive motor Life.Be exactly specifically, when each task one to carry out laterally across paper A4 sizes with opening with full color, it is previous into As the revolution distance of unit is 1200mm, until development clamping part of the charging clamping part of charging unit 2 to developing apparatus 5 The distance in region section is 21.4mm, and a perimeter of photoconductor drum 1 is 96mm.In the electricity removing for carrying out present embodiment The revolution distance of imaging unit be 1200- (96-21.4) mm.Revolution distance as imaging unit can just save about 7%.

In the following, toner used in the image forming apparatus of present embodiment is illustrated.

[synthesis of polyester 1]

In the reaction vessel with cooling tube, blender and nitrogen ingress pipe, 235 mass parts bisphenol-A epoxy second are added in 2 moles of addition products of alkane, 525 mass parts bisphenol A propylene oxide, 3 moles of addition products, 205 mass parts terephthalic acid (TPA)s, 47 mass parts Adipic acid and 2 mass parts dibutyltin oxides react 8 hours at 230 DEG C of normal pressure, then in the decompression item of 10-15mmHg After being reacted 5 hours under part, 46 mass parts trimellitic anhydrides are added in into reaction vessel, and reaction 2 is small under 180 DEG C, normal pressure When obtain [polyester 1].The number-average molecular weight of [polyester 1] is 2600, and weight average molecular weight 6900, Tg are 44 DEG C, acid value 26.

[synthesis of prepolymer 1]

In the reaction vessel with cooling tube, blender and nitrogen ingress pipe, 682 mass parts bisphenol-A epoxy second are added in 2 moles of addition products of alkane, 81 mass parts bisphenol A propylene oxide, 2 moles of addition products, 283 mass parts terephthalic acid (TPA)s, 22 mass parts oneself Diacid and 2 mass parts dibutyltin oxides react 8 hours at 230 DEG C of normal pressure, then in the reduced pressure of 10-15mmHg Lower reaction obtains [intermediate polyester 1] after 5 hours.The number-average molecular weight of [intermediate polyester 1] is 2100, and weight average molecular weight is 9500th, Tg be 55 DEG C, acid value 0.5, hydroxyl value 49.

Then, in the reaction vessel with cooling tube, blender and nitrogen ingress pipe, the [intermediate of 411 mass parts is added in Body polyester 1], 89 mass parts isophorone diisocyanate, 500 mass parts ethyl acetate, and after being reacted 5 hours at 100 DEG C It obtains [prepolymer l].The free isocyanate weight % of [prepolymer 1] is 1.53%.

[making of parent sizing material 1]

Using 40 mass parts of carbon black (Cabot Co., Ltd manufacture REGAL 400R), 60 mass parts as binder resin polyester tree Fat (Sanyo's chemical conversion RS-801 acid values 10, Mw20000, Tg64 DEG C) and the water of 30 mass parts are mixed by Henschel mixer, are come Obtain the mixture of the water leaking-in in pigment agglomeration body.It is set as 130 DEG C of two rollers by roll surface temperature to carry out 45 minutes Mill, and pass through flour mill and be ground into 1mm sizes and obtained later [parent sizing material 1].

[making of pigment and WAX (paraffin) dispersion liquid 1 (oil phase)]

In the container of stirring rod and thermometer is placed with, 545 mass parts [polyester 1], 181 mass parts solid stones are added in Wax, 1450 mass parts ethyl acetate, it is agitated to be warming up to 80 DEG C, and after being kept for 5 hours at 80 DEG C, 30 were cooled to 1 hour ℃.Then, 500 mass parts [parent sizing material 1], 100 mass parts charge control agents (1), 100 mass parts acetic acid are added in a reservoir Ethyl ester obtains [dissolution of raw material liquid 1] after carrying out mixing in 1 hour.

[dissolution of raw material liquid 1] moves on to 1500 mass parts dissolution of raw material liquid in container, uses ball mill (Ultra visco Mill, AIMEX company manufacture), with the liquor charging speed of 1kg/ hours, the disk peripheral speed of 6m/ seconds, fill 80 volume %'s The zirconium oxide bead of 0.5mm, under conditions of carrying out 3 times, to carry out the dispersion of carbon black, paraffin.Then, add in 425 mass parts and [polyester 1] of 230 mass parts, and carry out 1 time and obtain [pigment and wax dispersions 1] with the ball mill of above-mentioned condition.[face Material and wax dispersions 1] solid component concentration be adjusted to 50% under conditions of 130 DEG C, 30 minutes.

[production process of water phase]

By 970 mass parts ion exchange waters, organic resin particulate (the styreneisobutylene acid-the third of stably dispersing The copolymer of the sodium salt of olefin(e) acid butyl ester-methacrylate ethylene oxide additive sulfuric ester) 25wt% 40 matter of aqueous liquid dispersion Measure part, (Eleminol MON-7, Sanyo are melted into work to 48.5% aqueous solution of 140 mass parts disodium 4-dodecyl-2,4 '-oxydibenzenesulfonates Industry company manufacture) and 90 mass parts ethyl acetate be mixed after obtain milky liquid.As [water phase 1].

[emulsification process]

975 mass parts [pigment and wax dispersions 1], 2.6 mass parts are passed through into TK as the isophorone diamine of amine After homogenizer (special machineization manufacture) mix 1 minute under 5000rpm, [prepolymer 1] of 88 mass parts of addition and to pass through TK equal After change device (special machineization manufacture) mixes 1 minute under 5000rpm, add in [water phase 1] of 1200 mass parts and pass through TK homogenizing It carries out obtaining after the mixing of 20 minutes [emulsification slurry 1] while device adjusts under 8000-13000rpm.

[desolventizing process]

The input [emulsification slurry 1] in the container of blender and thermometer is placed with, and carries out at 30 DEG C taking off for 8 hours It is obtained after solvent [dispersed paste 1].

[clean and drying process]

After [dispersed paste 1] of 100 mass parts is filtered under diminished pressure,

(1) ion exchange water of 100 mass parts is added in filter cake and passes through TK homogenizers and is mixed (revolution Lower 10 minutes of 12000rpm) it filters afterwards.At this moment filtrate is milky.

(2) ion exchange water of 900 mass parts is added in the filter cake of above-mentioned (1), and passed through after assigning ultrasonic activation TK homogenizers are filtered under diminished pressure after mixing (lower 30 minutes of revolution 12000rpm).Repeat the conductance for being operable so that slurries Rate is below 10 μ C/cm.

(3) 10% hydrochloric acid is added in so that the pH value of the slurries of above-mentioned (2) is 4, and passes through Three- on this condition One Motor are filtered after stirring 30 minutes.

(4) 100 parts of ion exchange water is added in the filter cake of above-mentioned (3), and (revolution is mixed by TK homogenizers Lower 10 minutes of 12000rpm) after be filtered.This is repeated to be operable so that the conductivity of slurries below 10 μ C/cm and obtain [filter cake 1].Carry out at 42 DEG C the drying of 48 hours to [filter cake 1] with circulated air drying machine, and with the sieve that mesh is 75 μm It is screened to obtain [toner mother 101].Thus it is 0.974, volume average particle size (Dv) just to have obtained in average roundness It is under 5.3 μm for 6.3 μm, a number average particle diameter (Dp), there is the toner mother of size distribution that Dv/Dp is 1.19.

For the toner mother of 100 mass parts obtained by the above method, 1 matter is mixed by Henschel mixer Measure silicon dioxide microparticle powder H20TM [manufacture of Clariant Japan companies, the average primary particle diameter of the market sale of part 12nm, the processing of no silicone oil] and the RY50 of 2 mass parts [Japanese Aerosil companies manufacture, and average primary particle diameter 40nm has at silicone oil Reason], and toner is obtained after removing oversize grain or condensation product for 60 μm of sieve by mesh.

Above explanation is an example, and the present invention has distinctive effect in following various modes.

(mode A)

A kind of latent image carrier for including 1 grade of photoconductor drum；Charging with the surface uniform charging to the latent image carrier fills Put the charging mechanism of 2 grades；With by forming the exposure device 3 of electrostatic latent image to being exposed by the latent image carrier surface of uniform charging Deng exposure mechanism；With the development that the electrostatic latent image being formed on latent image carrier is used as to toner image development by developer The developing mechanism of 5 grade of device；With the image for so that latent image carrier surround the driving mechanism of mobile 119 grade of photoreceptor drive motor Forming apparatus is come to being located at by exposure mechanism when the driving for stopping driving mechanism at the end of image formation acts After the first latent image carrier Partial exposure between the exposure location of exposure mechanism and the development place of developing mechanism, just stop driving The driving of mechanism, also, when image formation acts beginning, from the driving of driving mechanism, pass through the exposure mechanism The charging place for being located at the charging mechanism before since the driving is turned to along the latent image carrier gyratory directions The second latent image carrier part between until the exposure location of the exposure mechanism is exposed

It is to stop driving at the end of image formation acts as a result, as the explanation done to the above embodiment When mechanism by exposure mechanism come to be located at exposure location and develop place between latent image carrier Partial exposure after, just stop The only driving of driving mechanism.On the other hand, when image formation acts beginning, to driving mechanism driving with being located at charging before Latent image carrier part between until exposure location after the latent image carrier arrival driving driving mechanism of point, passes through exposure mechanism To expose the surface of latent image carrier.

According to the method, when starting image formation action, exposure location is located at before the driving of drive motor and is shown Latent image carrier part between shadow place is when upper primary image formation acts end in by the state except electricity.Separately Outside, when starting image formation action, the sub-image to charge between place and exposure location is located at before the driving of drive motor Carrier part is that drive motor is driven when image formation this time is acted and started and is in by the exposure of exposure mechanism By the state except electricity.Then, when starting image formation action, it is located at before drive motor driving and is more leaned on than charging place Latent image carrier, when starting the action of image formation this time, can pass through around the latent image carrier part of moving direction upstream side Charging unit and in by the state of uniform charged.As a result, when image formation acts beginning, acted in the image formation When by charging mechanism by under uniform charged state latent image carrier part reach development place until during, by the development The latent image carrier part of point can be in by the state except electricity.

In addition, according to the method, at the end of image formation acts, in order to pass through exposure when driving mechanism is stopped Mechanism is come to being located at the latent image carrier part between exposure location and place of developing except electricity and it is required that latent image carrier is around shifting Dynamic circular displacement distance is the circular displacement distance between exposure location and development place.Therefore, it acts and ties with image formation Except electricity as soon as latent image carrier is compared around the previous image forming apparatus more than mobile week for latent image carrier during beam, The driving time of drive motor can be shortened and extend the service life of drive motor.

In addition, when image formation acts beginning, the drive of the driving mechanism except electricity is used for by the exposure of exposure mechanism It is dynamic be with for the driving by charging mechanism come the latent image carrier part through overcharge place as uniform charged state The driving for being driven to be carried out at the same time of mechanism.Since the driving does not cause latent image carrier to do extra circular movement, so just The driving time of driving mechanism will not be increased.

(mode B)

According to (mode A), the light source of exposure mechanism is LED.As a result, as illustrated by the above embodiment, by adopting It is used as the light source of exposure mechanism with LED, it will be able to realize miniaturization.

(mode C)

According to (mode A), the light source of exposure mechanism is laser diode.As a result, as illustrated by the above embodiment, It is used as the light source of exposure mechanism by using laser diode, it will be able to inhibit cost.

(mode D)

It is a kind of in the latent image carrier for including 1 grade of photoconductor drum；With the charging of the surface uniform charging to the latent image carrier The charging mechanism of 2 grade of device；It is filled with the exposure by forming electrostatic latent image to being exposed by the latent image carrier surface of uniform charging Put the exposure mechanism of 3 grades；It is used as what toner image developed by developer with by the electrostatic latent image being formed on latent image carrier The developing mechanism of 5 grade of developing apparatus；And turn by being formed between the transfer printing body of 21 grade of latent image carrier and intermediate transfer belt The toner image for printing electric field to be developed is transferred to the transfer interpreter of 9 grade of primary transfer roller in transfer printing body from latent image carrier Structure；Made with so that latent image carrier is surround in the image forming apparatus of the driving mechanism of mobile 119 grade of photoreceptor drive motor Latent image carrier removes method for electrically, is to pass through exposure when the driving for stopping driving mechanism at the end of image formation acts Ray machine structure is come to being located at the first latent image carrier part exposure between the exposure location of exposure mechanism and the development place of developing mechanism After light, just stop the driving of driving mechanism, also, when image formation acts beginning, from the driving of driving mechanism, lead to Overexposure mechanism is rotated for being located at the charging place of charging mechanism before since the driving along latent image carrier gyratory directions The second latent image carrier part between until the exposure location of exposure mechanism is exposed.

As a result, as the explanation done to the above embodiment, when starting image formation action, in drive motor Driving before be located at exposure location between place of developing latent image carrier part terminate in upper primary image formation action When in by except electricity state.In addition, when starting image formation action, charging is located at before the driving of drive motor Latent image carrier part between place and exposure location is to drive drive motor simultaneously when image formation this time is acted and started It is in by the exposure of exposure mechanism by the state except electricity.Then, it when starting image formation action, is driven in drive motor It is located at before dynamic and is more starting this time around the latent image carrier part of moving direction upstream side by latent image carrier than charging place Image formation action when, can be by charging unit and in by the state of uniform charged.As a result, it is formed in image dynamic When work starts, development is reached by the latent image carrier part under uniform charged state by charging mechanism when the image formation acts During until place, it can be in by the state except electricity by the latent image carrier part in the development place.

In addition, according to the method, at the end of image formation acts, in order to pass through exposure when driving mechanism is stopped Mechanism is come to being located at the latent image carrier part between exposure location and place of developing except electricity and it is required that latent image carrier is around shifting Dynamic circular displacement distance is the circular displacement distance between exposure location and development place.Therefore, it acts and ties with image formation Except electricity as soon as latent image carrier is compared around the previous image forming apparatus more than mobile week for latent image carrier during beam, The driving time of drive motor can be shortened and extend the service life of drive motor.In addition, when image formation acts beginning, pass through The exposure of exposure mechanism and be used for except electricity driving mechanism driving be with for by charging mechanism come through overcharge The latent image carrier part of point becomes the driving for being driven to be carried out at the same time of the driving mechanism of uniform charged state.It therefore, because should Driving is without so that latent image carrier does extra circular movement, so would not increase the driving time of driving mechanism.

Claims

1. a kind of image forming apparatus, including：

Latent image carrier；

Charging mechanism charges to the surface of the latent image carrier；

Exposure mechanism exposes to form electrostatic latent image by the surface of the latent image carrier to being electrically charged；

Developing mechanism develops using the electrostatic latent image being formed on the latent image carrier as toner image；

Driving mechanism carries out revolution driving to the latent image carrier,

It is by the exposure when driving for stopping the driving mechanism it is characterized in that at the end of image formation acts Mechanism is come to being located at the first latent image carrier between the exposure location of the exposure mechanism and the development place of the developing mechanism After Partial exposure, just stop the driving of the driving mechanism, also,

Image formation act start when, be from the driving of the driving mechanism, by the exposure mechanism for from The driving is located at charging mechanism charging place before starting turns to the exposure along the latent image carrier gyratory directions The second latent image carrier part between until the exposure location of ray machine structure is exposed.

2. image forming apparatus according to claim 1, it is characterised in that：

The light source of the exposure mechanism is LED.

3. image forming apparatus according to claim 1, it is characterised in that：

The light source of the exposure mechanism is laser diode.

4. a kind of latent image carrier for image forming apparatus removes method for electrically, which includes：

Latent image carrier；

Charging mechanism charges to the surface of the latent image carrier；

Driving mechanism carries out revolution driving to the latent image carrier,

The latent image carrier is characterized in except method for electrically,

At the end of image formation acts, when the driving for stopping the driving mechanism, be by the exposure mechanism come pair The first latent image carrier Partial exposure between the exposure location of the exposure mechanism and the development place of the developing mechanism Afterwards, just stop the driving of the driving mechanism, also,