CN101398657B - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
CN101398657B
CN101398657B CN200810168732.6A CN200810168732A CN101398657B CN 101398657 B CN101398657 B CN 101398657B CN 200810168732 A CN200810168732 A CN 200810168732A CN 101398657 B CN101398657 B CN 101398657B
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China
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voltage
toner
during
image
developing
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CN101398657A (en
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清水孝笃
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Oki Electric Industry Co Ltd
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Oki Data Corp
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Abstract

An image forming apparatus includes a latent image bearing body that bears a latent image, a charging member applied with a charging voltage and configured to charge a surface of the latent image bearing body, a developer bearing body applied with a developing voltage and configured to develop the latent image with a developer, a developer regulating member applied with a regulating-member-application voltage and configured to form a layer of the developer on the developer bearing body, and a voltage switching unit configured to switch the regulating-member-application voltage. In a non-image-forming period, the voltage switching unit switches the regulating-member-application voltage from a voltage set for an image forming period to a different voltage.

Description

Image processing system
Technical field
The present invention relates to image processing system.
Background technology
Normal image such as printer, duplicating machine, facsimile recorder, complex machines etc. forms device and is configured to form in the following manner image.Charging equipment is equably to the surface charging of photosensitive drums.Exposure sources shines the surface of this photosensitive drums to form sub-image.Then, the sub-image on the developing apparatus use toner development photosensitive drums is to form thus toner image.This toner image is transferred to recording medium, and is arrived this recording medium by photographic fixing (fixing) equipment by photographic fixing.
In developing apparatus, toner Cartridge is to developer roll and donor rollers supplying toner (that is, developer).Toner is the electricity charging by the electrification by friction at the part place between the part between developer roll and the donor rollers and developer roll and the developing blade.Form the toner layer with uniform thickness by this developing blade on the surface of developer roll.Generally speaking, the image forming apparatus of non-magnetic mono-component development type (use non-magnetic monocomponent toner) has such configuration: wherein developer roll and photosensitive drums are arranged with contacting with each other.This image forming apparatus has simple and compact structure, and is widely used.
Such image forming apparatus is configured to apply predetermined charge to toner, so that toner moves to sub-image on the photosensitive drums from developer roll.With regard to this respect, if produce the toner of unusual charging (namely, the toner of the electric charge that has obvious increase or reduce), this unusual charging toner may adhere to the territory, non-exposed area on the photosensitive drums, and may cause such as photographic fog or the such abnormal image of stain (smear).
Therefore, a kind of technology be used to abandoning this unusual charging toner has been proposed.In Japan special permission publication communique No.2004-45481, in the disclosed technology, use exposure sources to form predetermined sub-image on the surface of photosensitive drums.Unusual charging toner in the toner layer on the developer roll adheres to this sub-image, and scrapes off (that is, being dropped) by cleaning equipment from it.
In above-mentioned routine techniques, the unusual charging toner in the toner layer on the developer roll can be dropped.Yet other the unusual charging toner that is present in the developing cell device interior can not be dropped, and picture quality may be worsened by this unusual charging toner.And the same with the toner that unusually charges, normal toner also adheres to the identical sub-image on the photosensitive drums and may be dropped.
Summary of the invention
The present invention is intended to address the above problem, and the purpose of this invention is to provide and can effectively abandon unusual charging toner to improve thus the image processing system of picture quality from developing apparatus.
The invention provides image processing system, comprising: the sub-image supporting body of carrying sub-image; Be applied in charging voltage and the charging member on the surface of the sub-image supporting body that is configured to charge; Be applied in developing voltage and be configured to by so that developer adheres to sub-image and the developer carrier of development sub-image; Be applied in adjustment means and apply voltage and be configured to form at developer carrier the developer adjustment means of developer layer; And be configured to switch adjustment means and execute alive voltage switch unit.During non-image formation, this voltage switch unit applies voltage from switching to different voltage for the voltage that arranges during the image formation with adjustment means.
The present invention also provides a kind of image processing system, comprising: the sub-image supporting body of carrying sub-image; Be applied in charging voltage and the charging member on the surface of the sub-image supporting body that is configured to charge; Be applied in developing voltage and be configured to by so that developer adheres to sub-image and the developer carrier of development sub-image; And be applied in adjustment means and apply voltage and be configured to form at developer carrier the developer adjustment means of developer layer.During non-image formation, this adjustment means is executed the absolute value that alive absolute value is less than or equal to this developing voltage.
The present invention also provides a kind of image processing system, comprising: the sub-image supporting body of carrying sub-image; Be applied in charging voltage and the charging member on the surface of the sub-image supporting body that is configured to charge; Be applied in developing voltage and be configured to by so that developer adheres to sub-image and the developer carrier of development sub-image; And be applied in adjustment means and apply voltage and be configured to form at developer carrier the developer adjustment means of developer layer.During non-image formation, this adjustment means is executed alive absolute value greater than the absolute value of this developing voltage, and this adjustment means difference of applying voltage and this developing voltage form greater than image during in voltage difference.
Use this layout, can abandon unusual charging toner from developing apparatus, and can prevent photographic fog and/or stain.
Further range of application of the present invention will become apparent by the detailed description that after this provides.But, be to be understood that, although show the preferred embodiments of the present invention, only the mode with explanation provides specific descriptions and specific examples, because those skilled in the art can obviously be positioned at the variations and modifications of the spirit and scope of the present invention from this detailed description.
Description of drawings
In the accompanying drawing:
Fig. 1 is the block diagram that illustrates according to the control system of the image processing system of the first embodiment of the present invention;
Fig. 2 is the sectional view that illustrates according to the image processing system of the first embodiment of the present invention;
Fig. 3 is the synoptic diagram that illustrates according to the critical piece of the image processing system of the first embodiment of the present invention;
Fig. 4 is the chart that illustrates according to the CHARGE DISTRIBUTION of toner in the toner layer of the first embodiment of the present invention on developer roll;
Fig. 5 is the chart that illustrates according to the relation between photosensitive drums voltage, developing voltage and the adjusting vane voltage during the first embodiment of the present invention is during photographic fog toner (fog-toner) abandons;
Fig. 6 is the chart that illustrates according to the CHARGE DISTRIBUTION of toner in the toner layer on the developer roll during the first embodiment of the present invention is during the photographic fog toner abandons;
Fig. 7 A to 7F illustrates sequential chart, and this sequential chart has illustrated the time sequential routine according to the corresponding component of the first embodiment of the present invention.
Fig. 8 A to 8F illustrates sequential chart, and this sequential chart has illustrated the time sequential routine according to the corresponding component of another example of the first embodiment of the present invention.
Fig. 9 A to 9E is synoptic diagram, show according to the example shown in Fig. 8 A to 8F, during the photographic fog toner abandons in, the relation between photosensitive drums, developer roll and the charging roller;
Figure 10 is the form that the experimental results of the first embodiment of the present invention is shown;
Figure 11 is the block diagram that the control system configuration of image processing system according to a second embodiment of the present invention is shown;
Figure 12 illustrates according to a second embodiment of the present invention, during the stain toner abandons in, the chart of the relation between photosensitive drums voltage, developing voltage and the adjusting vane voltage;
Figure 13 is the chart that the toner charge in the toner layer on the developer roll distributes in illustrating according to a second embodiment of the present invention during the stain toner abandons;
Figure 14 A to 14F illustrates sequential chart, the time sequential routine of this sequential chart explanation corresponding component according to a second embodiment of the present invention.
Figure 15 A to 15F illustrates sequential chart, and this sequential chart explanation is the time sequential routine of another example corresponding component according to a second embodiment of the present invention.
Figure 16 A to 16E is synoptic diagram, illustrate according to the example shown in Figure 15 A to 15F, during the stain toner abandons in, the relation between photosensitive drums, developer roll and the charging roller;
Figure 17 is the form that the experimental results of the second embodiment of the present invention is shown;
Figure 18 is the block diagram of configuration of control system that the image processing system of a third embodiment in accordance with the invention is shown;
Figure 19 A to 19F illustrates sequential chart, and this sequential chart has illustrated the time sequential routine according to the corresponding component of third embodiment of the invention.
Embodiment
After this, embodiments of the invention will be described with reference to the drawings.
The first embodiment
Fig. 1 is the block diagram that illustrates according to the control system of the image processing system of the first embodiment of the present invention.Fig. 2 is the sectional view that illustrates according to the image processing system of the first embodiment of the present invention.Fig. 3 is the synoptic diagram that illustrates according to the critical piece of the image processing system of the first embodiment of the present invention.
Image processing system 100 according to present embodiment can be the image processing system of any type, such as printer, facsimile recorder, duplicating machine, composite machine (having several functions) etc.Herein, image processing system 100 has adopted and has used electrophotography to form the form of the electrophotographic printer of image.Although image processing system 100 can be configured to form coloured image, for ease of explaining that image processing system 100 will be described to form the image processing system of monochrome image.
As shown in Figure 2, image processing system 100 comprises image formation unit 10 and the fixation unit 4 of arranging along the transport path of recording medium (such as paper).Stacked recording medium 3 is stored in box etc.Recording medium 3 is picked up separately by pickup roller 91, and carries in the direction shown in the arrow A, to arrive a pair of alignment roller 92.Alignment roller 92 begins rotation at predetermined instant, and the transport path conveying recording medium 3 in the direction shown in the arrow B.When recording medium 3 was carried along transport path, the toner image (that is, developer image) that image formation unit 10 forms was transferred to recording medium 3.
Recording medium 3 (on it transfer printing toner image) is transported to and wherein carries out the fixation unit 4 that photographic fixing is processed.4 pairs of toner image heatings of fixation unit and exerting pressure so that toner image by photographic fixing to recording medium 3.Recording medium 3 (on it photographic fixing toner image) is further supplied with along the ejection path of direction shown in the arrow C.In the direction shown in the arrow D, recording medium 3 ejects from image processing system 100 by a pair of ejection roller 93, and is stacked on image processing system 100 tractor-drawn rake outward.
Image formation unit 10 comprises photosensitive drums 1 as the sub-image supporting body, as the charging roller 11 of the charging equipment on the surface that is used for charging photosensitive drums 1, as the developing cell 2 that is used for the developing apparatus of sub-image on the development photosensitive drums 1, cleaning equipment 16 etc.Photosensitive drums 1, charging roller 11, developing cell 2 and cleaning equipment 16 are installed in the shell 10a.
As developer storing body, the toner (that is, developer) that developing cell 2 storage toner Cartridges 94 are supplied with.Developing cell 2 comprises that the developer roll 12 arranged in the face of photosensitive drums 1 (namely, developer carrier), and for toner supplying roller 18 from toners to developer roll 12 that supply with (namely, supply member), be used for forming on the surface of developer roll 11 adjusting vane 13 (that is, developer adjustment means) of thin toner layer.
Arrange in the face of photosensitive drums 1 as the LED (light emitting diode) of light-emitting component (or sub-image write device) 15.LED 15 according to the surface of view data irradiation photosensitive drums 1 to form thus sub-image.Transfer roll 14 (that is, transfer apparatus) is arranged in the face of photosensitive drums 1 via the transport path of recording medium 3.
Cleaning equipment 16 is configured to by scraping off the surface that toner cleans photosensitive drums 1 from photosensitive drums 1, and the toner that scrapes off is stored as used toner.The used toner recovery unit (not shown) of the used toner of storage by having spiral etc. is sent to image formation unit 10 outsides.
Rotate in the respective direction shown in photosensitive drums 1, developer roll 12, toner supplying roller 18, charging roller 11 and the arrow of transfer roll 14 in Fig. 2.Photosensitive drums 1 drives by the ID motor 17 of describing after a while.The rotation of photosensitive drums 1 is transferred to developer roll 12 and toner supplying roller 18 via unshowned gear.Charging roller 11 is by the friction-driven between charging roller 11 and the photosensitive drums 1.
Photosensitive drums 1 is such as being comprised of the photoconductive layer that forms on the drum type electric conductor of aluminium etc. and this electric conductor.Charging roller 11 is comprised of the conduction elastic layer of chloropropylene oxide that forms on the conductive shaft of stainless steel etc. and the axle etc.The surface of charging roller 11 contact photosensitive drums 1 is with the surface of the photosensitive drums 1 of charging equably thus.
LED 15 is configured to for the surface of the uniform charging of the photosensitive drums 1 of optionally exposing forming sub-image, and is comprised of LED element, LED driving element and lens arra.LED 15 so arranges, so that the light of LED 15 emissions focus on the surface of photosensitive drums 1.
Developer roll 12 is such as being comprised of the conductive shaft of stainless steel etc. and the conduction elastic layers such as polyurethane that form around this axle.Toner supplying roller 18 is such as forming by conductive shafts such as stainless steels with around the foam elastic layer of silicones of this axle etc.Toner supplying roller 18 contact developer rolls 12 are arranged.Adjusting vane 13 for example is comprised of the stainless steel flat plate member.Adjusting vane 13 so arranges, that is, so that the surface that its tip (tip) presses developer roll 12.Developing cell 2 so arranges, that is, so that the surface of developer roll 12 contact photosensitive drums 1.
Transfer roll 14 for example is comprised of the foam elastic body with electric conductivity.Transfer roll 14 contacts layout with photosensitive drums 1, thereby the toner image on the photosensitive drums 1 is transferred to recording medium 3.
Cleaning equipment 16 is configured to the lip-deep residual toner that is retained in photosensitive drums 1 be used to scraping off after transfer printing, and scraping defogging toner (as described later, shifting to photosensitive drums 1 from developing cell 2) abandons as used toner with the toner that will be scraped off.Cleaning equipment 16 comprises rubber tree leaf, thereby its tip is pressed the surface of photosensitive drums 1 and scraped off toner from it.
Next, Description Image is formed the control system of device 100.
As shown in Figure 1, charging roller 11 applies with charging voltage by charging voltage control module 21.Developer roll 12 applies with developing voltage by developing voltage control module 22.Adjusting vane 13 applies with adjusting vane voltage (that is, adjustment means applies voltage) by adjusting vane voltage control unit 23.
Charging voltage control module 21, developing voltage control module 22 and adjusting vane control module 23 are connected to voltage switch unit 31.Voltage switch unit 31 comprises that printing voltage setting unit 32 and photographic fog toner abandon voltage setting unit 33.According to the instruction from record control unit 30, switch between the voltage (the photographic fog toner abandons voltage setting unit 33 maintenances) of voltage switch unit 31 during abandoning for the voltage during printing (printing voltage setting unit 32 keeps) with for the photographic fog toner, this switching is apprised of to charging voltage control module 21, developing voltage control module 22 and adjusting vane voltage control unit 23.The voltage that charging voltage control module 21, developing voltage control module 22 and adjusting vane voltage control unit 23 are informed according to voltage switch unit 31 arranges output voltage.
ID motor 17 links to each other with ID motor control unit 27.Transfer roll 14 links to each other with transfer voltage control module 24.LED 15 penetrates control module 25 with the LED hair and links to each other.ID motor control unit 27, transfer voltage control module 24 and LED hair are penetrated control module 25 according to the light emission of controlling respectively the driving of ID motor 17, the transfer voltage that is applied to transfer roll 14 and LED 15 from the instruction of record control unit 30.
Next, Description Image is formed the operation of device 100.
At first, printing will be described.In printing, charging roller 11 is applied in the surface of charging voltage with the photosensitive drums 1 of charging equably thus.Then, LED 15 is actuated to according to luminous from the view data of record control unit 30, to form thus the lip-deep sub-image of photosensitive drums 1.And the developer roll 12 that has the toner layer of formation on its surface is applied in developing voltage, with the sub-image that develops on photosensitive drums 1 surface thus.With regard to this respect, adjusting vane 13 is applied in adjusting vane voltage take the electric charge of the toner that is used for the toner layer on the control developer roll 12 as predetermined value.
Next, transfer roll 14 is applied in transfer voltage with the lip-deep toner image of thus transfer printing photosensitive drums 1 to recording medium 3.Then, toner image is arrived recording medium 3 by fixation unit 4 by photographic fixing, and printing is finished.
With regard to this respect, use the toner that to bear charging with (20-25 ℃ of normal temperature and normal humidity at image processing system 100,40-60%) in the situation of operation, charging voltage is set to-1000V, and developing voltage is set to-and 200V and adjusting vane voltage is set to-300V.When charging roller 11 was applied in predetermined voltage or larger voltage, the surface of photosensitive drums 1 was recharged, and the surface voltage of photosensitive drums 1 increases according to applying voltage.In the present embodiment, the surface voltage of photosensitive drums 1 is-500V.The sub-image that irradiation by LED 15 forms has-voltage (electromotive force) of 100V, and use toner development sub-images (oppositely developing) by developer roll 12.Can bear the charging toner has been added by the outside and is used for providing the polystyrene resin of Rechargeability and mobile silica etc. to form.
Term " image density " expression is according to the density of the toner image of view data formation.More specifically, image density is the zone of toner image and the ratio of printable area.If toner image forms (that is, so-called solid is printed) at whole printable area, then image density is 100%.
In the toner layer that developer roll 12 forms, only the toner corresponding to sub-image is used for developing.In the situation of the printing of carrying out low image density, other a large amount of toners are retained on the developer roll 12.This toner that is retained on the developer roll 12 turns back to developing cell 2, and scrapes off from developer roll 12 by toner supplying roller 18.And this toner stands electrification by friction between developer roll 12 and the toner supplying roller 18 and the electrification by friction between developer roll 12 and the adjusting vane 13.The part of this toner is transported to the tip portion between photosensitive drums 1 and the developer roll 12, and other parts of this toner are without adjusting vane 13 and be retained in the inside of developing cell 2.
Therefore, if repeatedly carry out the printing of low image density, be retained in developer roll 2 lip-deep toners and may be damaged with the toner that is retained in the inside of developing cell 2.In this case, the extra adjuvant such as silica can maybe can embed the toner from the toner separation, and this may cause the charging that reduces maybe may cause reversed polarity of Rechargeability.And the toner (that is, therefrom not scraping off by toner supplying roller 18) that is retained on the developer roll 12 may repeatedly experience electrification by friction, and therefore can increase the electric charge of toner.
Next, will the CHARGE DISTRIBUTION of toner in the toner layer be described on the developer roll 12.
Fig. 4 illustrates according to first embodiment of the present invention toner charge distribution plan in the toner layer that developer roll forms.
In Fig. 4, dotted line A shows the CHARGE DISTRIBUTION in original state developer roll 12 lip-deep toner layers.Solid line B shows in the CHARGE DISTRIBUTION of 20000 pages being carried out the toner in the toner layer on the developer roll 12 after the low-density printing.
In Fig. 4, should be appreciated that after carrying out the low-density printing, compare with the starting stage, the charge distribution width widen, that is, the probability that exists of low electric charge toner and high electric charge toner increases.And, should be appreciated that from Fig. 4 after low-density is printed, to produce reverse charging toner (, just charging toner) herein.
In print procedure, the reverse charging toner trends towards being electrostatically attracted to the territory, non-exposed area on the surface of photosensitive drums 1a, and low electric charge toner trends towards moving towards photosensitive drums 1, because toner adheres to a little less than the power (that is, image force) of developer roll 12.This toner may adhere to the background area of image,, photographic fog may occur that is.The phenomenon that low electric charge toner and reverse charging toner adhere to the background area of image is called as " photographic fog ".And, cause low electric charge toner and the reverse charging toner of photographic fog to be called as " photographic fog toner " (that is the developer that, causes photographic fog).
In the present embodiment, voltage during charging voltage, developing voltage and the adjusting vane voltage voltage during be used for to print switches to and abandons for the photographic fog toner optionally abandons low electric charge toner and reverse charging toner (being the photographic fog toner) in thus during non-image formation.In other words, charging voltage, developing voltage and adjusting vane voltage switch to for the predetermined voltage during the non-image formation from the voltage that is used for during image forms, thereby effectively abandon the photographic fog toner from developing cell 2.
With regard to this respect, term " image forms operation " means the operation that toner forms toner image that charges normal of using on the photosensitive drums 1, and comprises for form the printing of toner image (will be transferred to recording medium 3) and the operation that forms the compensating pattern such as color displacement compensating pattern and image density compensating pattern according to view data.Charging voltage, developing voltage, adjusting vane voltage and the service voltage that is used for these operations is for the voltage during the image formation (more specifically, for the voltage during printing).
And term " non-image formation operation " means that being different from above-mentioned image forms the operation that operates.During " photographic fog toner abandon during " is set to non-image formation during (that is, be used for non-image formation operation during) a certain.That wherein voltage is from switching for the voltage that arranges during the image formation during the change in voltage during the photographic fog toner abandons.In other words, during the change in voltage be a part during the non-image formation.With regard to this respect, in can being arranged on during image processing system 100 driven non-image formation during the change in voltage arbitrarily during.
Next, the relation between photosensitive drums voltage, developing voltage and the adjusting vane voltage during using description to the photographic fog toner and abandoning.
Fig. 5 shows the chart according to the relation between photosensitive drums voltage, developing voltage and the adjusting vane voltage during being used for toner and abandoning of first embodiment of the invention.
In Fig. 5, to compare with the relevant voltage (illustrating by a dotted line) during being used for printing, the photosensitive drums voltage, developing voltage and the adjusting vane voltage that are used for during the photographic fog toner abandons are illustrated by solid line.
During printing (namely, normal print processing) in, adjusting vane voltage Vb1-0 is set to larger than (and polarity is same as) developing voltage Vdv-0, and to produce thus electric field, wherein adjusting vane 13 ends are identical with toner with respect to the polarity of developer roll 12.The toner that this electric field causes charging normal is through adjusting vane 13.Here, adjusting vane voltage Vb1-0 is set to-300V and developing voltage Vdv-0 be set to-200V so that the voltage difference between adjusting vane voltage Vb1-0 and the developing voltage Vdv-0 be-100V (=(300V)-(200V)).
Charging voltage is set up, thus cause toner on the developer roll 12 to adhere to sub-image (that is, oppositely developing) thus and prevent from adhering to other zones that are different from sub-image during toner is during printing.Here, the charging voltage of-1000V is applied to charging roller 11 so that photosensitive drums voltage Vdr-0 (that is, the surface voltage of photosensitive drums 1) is-500V.After the surface of LED 15 irradiation photosensitive drums 1, the electromotive force of sub-image image (that is, sub-image electromotive force) Vdr-e is-100V.
Use this configuration, the voltage difference between photosensitive drums voltage Vdr-0 and the developing voltage Vdv-0 is-300V (=(500V)-(200V)), use this voltage difference, prevent that the toner that charges normal from shifting to other zones outside the sub-image.And the voltage difference between adjusting vane voltage Vb1-0 and the developing voltage Vdv-0 is-100V (=(300V)-(200V)), use this voltage difference, sub-image is charged normal toner development.
Contrast ground, in the process, the absolute value of adjusting vane voltage changed to less than the value during printing during the photographic fog toner in during non-image formation abandoned.When the absolute value of adjusting vane voltage reduced, the difference of adjusting vane voltage and developing voltage also reduced.Therefore, the power that the reverse charging toner attracted to adjusting vane 13 weakens, and therefore the photographic fog toner more may pass through adjusting vane 13.Adjusting vane voltage preferably has identical polarity with developing voltage, and the absolute value of adjusting vane voltage is preferably less than the absolute value of developing voltage.
Use this configuration, form electric field, wherein adjusting vane 13 ends with respect to the polarity of developing blade 12 with to charge normal toner opposite.Therefore, charge normal toner and attracted to adjusting vane 13.Thereby the photographic fog toner in the developing cell 2 further increases through the probability of adjusting vane 13.Herein, in during the photographic fog toner abandons, adjusting vane voltage Vbl-1 is set to-100V, and developing voltage Vdv-1 is set to-300V so that the voltage difference between adjusting vane voltage Vbl-1 and the developing voltage Vdv-1 be+200V (=(100V)-(300V)).
Next, with the CHARGE DISTRIBUTION of toner in the developer roll 12 lip-deep toner layers in during describing the photographic fog toner and abandoning.
Fig. 6 is the chart that is illustrated in the CHARGE DISTRIBUTION of toner in the toner layer that forms on the developer roll.
Fig. 6 show with print during compare, the photographic fog toner abandons the CHARGE DISTRIBUTION of toner in the toner layer on the middle developer roll 12.With compare during the printing shown in the dotted line C, during the photographic fog toner shown in the solid line D abandons in the downward lateral deviation of CHARGE DISTRIBUTION of toner move (that is, the right side among Fig. 6).Therefore, the probability that exists of low electric charge toner increases in should be appreciated that during the photographic fog toner abandons.Thereby should be appreciated that the photographic fog toner in the developing cell 2 increases through developing blade 13 and the probability that moves on to the surface of developer roll 12.
And, the voltage difference during the voltage difference between photosensitive drums voltage Vdr-1 and the developing voltage Vdv-1 is set to larger than during the printing.Like this, the lip-deep photographic fog toner of developer roll 12 more may adhere to the surface of photosensitive drums 1.
In the present embodiment, photosensitive drums voltage Vdr-1 is-700V, and developing voltage Vdv-1 is-300V so that the voltage difference between photosensitive drums voltage Vdr-1 and the developing voltage Vdv-1 be-400V (=(700V)-(300V)).Be-700V for photosensitive drums voltage Vdr-1 is set, the charging voltage Vch-1 of-1200V is applied to charging roller 11.
Next, with time sequential routine of the corresponding component in during describing the photographic fog toner and abandoning.
Fig. 7 A to 7F shows a kind of sequential chart, and this sequential chart illustrated according to the first embodiment of the present invention, the time sequential routine of luminous, the charging voltage of ID motor 17, LED 15, photosensitive drums voltage, developing voltage and adjusting vane voltage.
At first, in response to the print job start signal from record control unit 30, print job begins, and ID motor 17 start working (t1).This causes photosensitive drums 1, charging roller 11, developer roll 12 and toner supplying roller 18 to begin rotation.Synchronous with the rotation starting, the charging voltage Vch-0 during being used for printing is applied to charging roller 11.By applying charging voltage Vch-0, the surface of photosensitive drums 1 is charged to for the photosensitive drums voltage Vdr-0 during printing.Simultaneously (at moment t1), the developing voltage Vdv-0 during being used for printing is applied to developer roll 12, and the adjusting vane voltage Vbl-0 during being used for printing is applied to adjusting vane 13.Like this, L0 begins during the printing.
Then, LED 15 begins light emission operation according to page sync signal and view data.When LED 15 was luminous, the electromotive force of the irradiation area of photosensitive drums 1 dropped to sub-image electromotive force Vdr-e, and forms sub-image.Sub-image is by toner development, and the result forms toner image according to view data.When LED 15 finishes for corresponding to the light emission operation of the page or leaf of view data the time, L0 finishes (t2) during the printing.
At moment t2, recording medium 3 (forming image on it) is ejected, and voltage switches.More specifically, at moment t2, when ID motor 17 still keeps work, the charging voltage Vch-1 during charging voltage switches to and abandons for the photographic fog toner.By switching charging voltage, the photosensitive drums voltage Vdr-1 during photosensitive drums voltage switches to and abandons for the photographic fog toner.And, at moment t2, the developing voltage Vdv-1 during developing voltage switches to and abandons for the photographic fog toner, and adjusting vane voltage switches to the adjusting vane voltage during abandoning for the photographic fog toner.Like this, L1 began during the photographic fog toner abandoned.
Here, the example that developing voltage and adjusting vane voltage and charging voltage is switched is simultaneously made description.But, can provide time delay therebetween, this time delay is rotated the time of distance between charging roller 11 and the developer roll 12 along the circumference of photosensitive drums 1 corresponding to photosensitive drums 1.
(L1) proceeded to constantly t3 always during the photographic fog toner abandoned.At moment t3, ID motor 17, charging voltage, developing voltage, photosensitive drums voltage and adjusting vane voltage are closed.Like this, print job is finished, and closed condition continues always, until receive next print job.With regard to this respect, during above-mentioned photographic fog toner abandons in (L1), luminous the closing of LED 15, and on photosensitive drums 1, do not form sub-image.
When (L1) was elongated during the photographic fog toner abandons, the photographic fog toning dosage that abandons increased.But, when (L1) was elongated during the photographic fog toner abandons, the rotation of photosensitive drums 1 increased, and therefore, the lost of life of photosensitive drums 1 and printing output capacity step-down.Therefore, must suitably regulate the photographic fog toner and abandon according to the application of image processing system during the length of (L1).More specifically, be necessary to abandon at least the photographic fog toner around developer roll 12, and more preferably abandon around the photographic fog toner of toner supplying roller 18 with around the photographic fog toner of developer roll 12.Therefore, (L1) was preferably more than or equals developer roll 12 and revolve the required time of turning around during the photographic fog toner abandoned, and more preferably revolved the summation that turn around required time and toner supplying roller 18 revolve the required time that turns around more than or equal to developer roll 12.
As mentioned above, the example that wherein all adjusting vane voltages, developing voltage and the charging voltage voltage during be used for printing is switched to the voltage during abandoning for the photographic fog toner is described.
In the present embodiment, L0 is described to during the image formation during the whole printing.With regard to this respect, during forming, image comprises at least that the processing for the charging of photosensitive drums 1, the processing of exposure photosensitive drums 1, the processing of using developer roll 12 usefulness toner development sub-images, transfer printing toner image are to the processing of recording medium 3 or the transfer article such as transfer belt.
In the present embodiment, in being arranged on during the non-image formation between print job and the follow-up print job during the change in voltage.And, in the present embodiment, the time interval between page or leaf and the page or leaf, for example, between first page and the second page or the time interval between second page and the 3rd page be considered to a part during the image formation.But, this time interval can be considered to the part during the non-image formation.In this case, can be arranged on during the change in voltage page or leaf with page between the time interval in.
In the example shown in Fig. 7 A to 7F, charging voltage, developing voltage and adjusting vane voltage switch simultaneously.But, consider the position of rotation of photosensitive drums 1, corresponding voltage can be at different time-switchings.
Next, with another example in time sequential routine of corresponding component in during describing the photographic fog toner and abandoning.
Fig. 8 A to 8F shows sequential chart, and this sequential chart has illustrated the time sequential routine of luminous, charging voltage, photosensitive drums voltage, developing voltage and the adjusting vane voltage of ID motor 17 according to another example of first embodiment of the invention, LED 15.Fig. 9 A to 9E is synoptic diagram, is used for explanation according to the relation between photosensitive drums, developer roll and the charging roller during the photographic fog toner abandons of the example shown in Fig. 8 A to 8F.
At first, in response to the print job start signal from record control unit 30, print job begins, and ID motor 17 be opened (t1).This causes photosensitive drums 1, charging roller 11, developer roll 12 and toner supplying roller 18 to begin rotation.Synchronous with the rotation starting, the charging voltage Vch-0 during being used for printing is applied to charging roller 11.By applying charging voltage Vch-0, the surface of photosensitive drums 1 is charged to for the photosensitive drums voltage Vdr-0 during printing.Simultaneously (at moment t1), the developing voltage Vdv-0 during being used for printing is applied to developer roll 12, and the adjusting vane voltage Vbl-0 during being used for printing is applied to adjusting vane 13.Like this, L0 begins during the printing.
Then, LED 15 begins light emission operation according to page sync signal and view data.When LED 15 was luminous, the electromotive force of the irradiation area of photosensitive drums 1 dropped to sub-image electromotive force Vdr-e, and forms sub-image.Sub-image is by toner development, and the result forms toner image.When LED 15 finished light emission operation, L0 finished (t2) during the printing.
At moment t2, photosensitive drums 1, charging roller 11 and developer roll 12 are in respectively the position shown in Fig. 9 A.Herein, position alpha is defined in moment t2 in the face of the photosensitive drums 1 lip-deep position of charging roller 11.At moment t2, charging voltage switches to Vch-1.After this, the regional γ on the downstream end of photosensitive drums 1 lip-deep position alpha has the surface potential of Vdr-1.
And when photosensitive drums 1 was further rotated (t2 '), photosensitive drums 1, charging roller 11 and developer roll 12 were in respectively the position shown in Fig. 9 B.In this state, the position alpha on the photosensitive drums 1 is in the face of developer roll 12.At moment t2 ', developing voltage switches to Vdv-1.After this, when the regional DR1 on the downstream end on position alpha (on the surface of photosensitive drums 1) faced developer roll 12, photographic fog toner (on the developer roll 12) adhered to the surface of photosensitive drums 1.Here, regional DR1 has the length that the photographic fog toner that is enough to (more preferably, on developer roll 12 and toner supplying roller 13) on the mobile developer roll 12 arrives photosensitive drums 1.
And at moment t3, photosensitive drums 1, charging roller 11 and developer roll 12 are in respectively the position shown in Fig. 9 C.Position β is defined as the end, downstream of regional DR1.When position β faced charging roller 11, charging voltage was closed.With regard to this respect, print (for example, if image processing system 100 receives next print job) if continue to carry out, charging voltage switches to Vch-0.
And at moment t3 ', photosensitive drums 1, charging roller 11 and developer roll 12 are in respectively the position shown in Fig. 9 D.When position β when the developer roll 12, developing voltage is closed, and the photographic fog toner finishes during abandoning.
The switching sequence of adjusting vane voltage is identical with the switching sequence of developing voltage.But, shown in Fig. 9 E, according to the distance B V1 that developer roll 12 is faced between the position of adjusting vane 13 in the face of position and the developer roll 12 of photosensitive drums 1, adjusting vane voltage can switch to switch different sequential from developing voltage.It also is feasible that ID motor 17 cuts out afterwards at moment t3 ' (that is, when developing voltage and adjusting vane voltage are closed).
Next, when changing relevant voltage, carry out the experiment that the photographic fog toner abandons operation with describing.
Figure 10 is the form that illustrates according to the experimental result of the first embodiment of the present invention.
In this experiment, in the combination that changes adjusting vane voltage, developing voltage and charging voltage, carry out the photographic fog toner and abandon operation.After the photographic fog toner abandons operation, carry out printing, and visually the degree that is enhanced of the photographic fog on the evaluate recorded medium 3 (with abandon operation at the photographic fog toner before photographic fog on the recording medium 3 printed compare).Assessment result is shown among Figure 10.
Adjusting vane voltage, developing voltage and charging voltage are switched as shown in Figure 5.During printing, charging voltage is-1000V, and photosensitive drums voltage is-500V, and developing voltage is-and 200V and adjusting vane voltage is-300V.
The measurement of following execution photographic fog.When image processing system 100 was carried out the printing of 0% image density, image processing system 100 stopped.And after the development sub-image and before the image that transfer printing is developed, the adhesive tape " Scotch Mending Tape " (Sumitomo3M Ltd. manufacturing) that is called as photographic fog sampling band is attached to the surface of photosensitive drums 1.Then, photographic fog sampling band (having adhered to toner) is attached to blank sheet of paper.In order to compare, the adhesive tape (being called the contrast attenation factor) that is not attached to photosensitive drums also is attached to identical blank sheet of paper.Then, using the measurement diameter is spectrophotometric tintmeter " CM-2600d " (Konica-Minolta Ltd. manufacturing) the measurement photographic fog sampling band of 8mm and the color phase differential between the contrast attenation factor.Calculate aberration (L*a*b color coordinate system) according to following formula:
ΔE＝(ΔL 2+Δa 2+Δb 2) 1/2
As follows for assessment of the standard of improving (solution) photographic fog degree:
The photographic fog rank The scope of Δ E
5 0.0≤ΔE<0.5
4 0.5≤ΔE<1.0
3 1.0≤ΔE<1.5
2 1.5≤ΔE<2.0
1 2.0<ΔE
[test 1]
In test 1, charging voltage switches to-1200V (that is, photosensitive drums voltage be switched to-700V).Developing voltage does not switch from-200V, because it is intended to increase the voltage difference between photosensitive drums voltage and the developing voltage.In this case, the photographic fog rank is rank 1, that is, photographic fog is not solved substantially.Reason is as follows.Voltage difference between photosensitive drums voltage and the developing voltage is-500V (=(700V)-(200V)), greater than the voltage difference during printing, and the photographic fog toner that therefore adheres to developer roll 12 is abandoned effectively.But, the photographic fog toner that exists in the developing cell 2 is not dropped, and therefore, the part of the photographic fog toner that exists in developing cell 2 arrives photosensitive drums 1 through adjusting vane 13 and in printing, thereby causes photographic fog.
[test 2]
In test 2, adjusting vane voltage switches to-100V.In this case, the photographic fog rank is rank 3, and photographic fog broadly appropriate solves.Reason is as follows.Voltage difference between adjusting vane voltage and the developing voltage is+100V (=(100V)-(200V)), and the polarity of the electric field of adjusting vane 13 ends be reverse with respect to developer roll 12.Like this, the photographic fog toner in the developing cell 2 more may be shifted to developer roll 12 and move to photosensitive drums 1 (that is, will be dropped), so that the increase of the photographic fog that abandons toning dosage, and the photographic fog toning dosage that is retained in the developing cell 2 reduces.
[test 3]
In test 3, adjusting vane voltage switches to-and 100V and developing voltage switch to-300V.In this case, the photographic fog rank is rank 4, and tests 2 and compares to some extent and to increase.Reason is as follows.By switching developing voltage and regulation voltage, the electric polarity of adjusting vane 13 ends is reverse with respect to developer roll 12, and the voltage difference between adjusting vane voltage and the developing voltage increase to+200V (=(100V)-(300V)).Like this, the photographic fog toner that adheres to developer roll 12 more may move to photosensitive drums 1, so that the photographic fog that abandons toning dosage increases.
[test 4]
The test 4 in, adjusting vane voltage switches to-100V, and charging voltage switch to-1200V (that is, photosensitive drums voltage switch to-700V).In this case, the photographic fog rank is rank 4, and tests 3 basic identical.Reason is as follows.Voltage difference between adjusting vane voltage and the developing voltage is+100V (=(100V)-(200V)), and the electric polarity of adjusting vane 13 ends reverse with respect to developer roll 12.Voltage difference between photosensitive drums voltage and the developing voltage is-500V (=(700V)-(200V)), and its absolute value increase.Like this, the photographic fog toner that removes and adhere to the surface of developer roll 12 from developing cell 2 more may be shifted to photosensitive drums 1, so that the photographic fog that abandons toning dosage increases.
[test 5]
In test 5, adjusting vane voltage switches to-100V, developing voltage switches to-300V and charging voltage switch to-1200V (that is, photosensitive drums voltage switch to-700V).In this case, the photographic fog rank is rank 5, and this is fabulous result.Reason is as follows.Voltage difference between adjusting vane voltage and the developing voltage is+200V (=(100V)-(300V)), and when the electric polarity of adjusting vane 13 ends with respect to developer roll 12 oppositely the time, its absolute value further increases.And the voltage difference between photosensitive drums voltage and the developing voltage is-400V (=(700V)-(300V)), and its absolute value greater than the voltage difference absolute value during printing.Like this, the photographic fog toner that exists in the developing cell 2 more may be shifted to developer roll 12, and the photographic fog toner that adheres to developer roll 12 more may be shifted to photosensitive drums 1.
[test 6]
In test 6, do not provide (that is, voltage does not switch) during the change in voltage.In this case, the photographic fog rank is rank 1.More specifically, the level of evaluation of photographic fog is also poorer than above-mentioned test 1.
In above-mentioned test 1, only switch charging voltage.The absolute value of adjusting vane voltage is not less than or equals the absolute value of developing voltage, and therefore the photographic fog toner can not pass through adjusting vane 13.
In above-mentioned test 2, the absolute value of adjusting vane voltage is less than or equal to the absolute value of developing voltage, and therefore the photographic fog toner can pass through adjusting vane 13.
In above-mentioned test 3, adjusting vane voltage and developing voltage switch so that the absolute value of adjusting vane voltage is less than or equal to the absolute value of developing voltage, and therebetween voltage difference greater than test 2 voltage differences.Therefore, relatively large toner can pass through adjusting vane 13.
In above-mentioned test 4, adjusting vane voltage and charging voltage (that is, photosensitive drums voltage) are switched, so that the absolute value of adjusting vane voltage is less than or equal to the absolute value of developing voltage, and the voltage difference between developing voltage and the photosensitive drums voltage increases.Therefore, toner more may and more may be shifted to photosensitive drums 1 through adjusting vane 13.
In above-mentioned test 5, adjusting vane voltage, developing voltage and charging voltage are (namely, photosensitive drums voltage) switch, increase so that the absolute value of adjusting vane voltage is less than or equal to the absolute value of developing voltage and voltage difference therebetween, and so that the voltage difference between developing voltage and the photosensitive drums voltage also increase.Therefore, toner more may pass through adjusting vane 13, and more may shift to photosensitive drums 1.
In the present embodiment, the adjusting vane voltage Vbl-1 during being used for the photographic fog toner and abandoning is-100V, and therefore, and the polarity of voltage that is applied to adjusting vane 13 is identical with the polarity that can bear the toner that charges.And the absolute value of adjusting vane voltage Vbl-1 is less than the absolute value of (or equaling) developing blade.Therefore, the toner of reverse charging and low electric charge (negative charging) toner is maintained on the developer roll 12 and does not attracted to adjusting vane 13.In other words, photographic fog toner (that is, reverse charging toner and low electric charge toner) is through adjusting vane 13.
Above-mentioned experimental results only illustrates the example of relevant voltage combination.Therefore voltage difference between voltage difference between adjusting vane voltage and the developing voltage and photosensitive drums voltage and the developing voltage is related to the movement of photographic fog toner, and the solution of photographic fog is subject to the impact of the setting of relevant voltage.From above-mentioned experimental results, can realize, obtain to solve to a certain extent the advantage of photographic fog by switching adjusting vane voltage, and by switching the further advantage of developing voltage and charging voltage (except the adjusting vane voltage) photographic fog that achieves a solution.
And, preferably, further switch the service voltage that supplies to toner supplying roller 18.In this case, the supply voltage Vsp-0 that is used for printing during forming for example is set to-300V, and its absolute value is greater than developing voltage.The service voltage Vsp-1 that is used for during the photographic fog toner abandons for example is-100V that its absolute value is less than developing voltage.Therefore in this case, the photographic fog toner can be shifted to developer roll 12 from toner supplying roller 18, and becomes and can be discarded near the photographic fog toners that exist the toner supplying roller 18.
Therefore, the photographic fog toner in the whole developing cell 2 can abandon operation by a photographic fog toner and abandon, and therefore, the interval that the photographic fog toner abandons between the operation can prolong.In other words, the interval between during the change in voltage can prolong.In this example, adjusting vane voltage and service voltage can arrange mutually the samely, so that adjusting vane voltage can obtain by identical power supply with service voltage.Alternatively, the service voltage Vsp-0 during be used for printing for example can be set to-350V, and the service voltage Vsp-1 that is used for during the photographic fog toner abandons can for example be set to-50V, and this is different from adjusting vane voltage Vbl-0 and Vbl-1.
The description of present embodiment only is example, and corresponding voltage is not limited to this.Voltage can be set up, thereby effectively abandons the stain toner according to voltage output range for the treatment of conditions (such as the attribute of charge characteristic or the respective rollers of toner), environmental baseline (such as temperature or humidity), power supply etc.
In the present embodiment, in the print job process, when printing finishes, carry out the photographic fog toner and abandon operation.But, can in the print job process, before printing begins, carry out the photographic fog toner and abandon operation.Alternatively, can also between print job, carry out independently the photographic fog toner and abandon operation.Can also carry out in short time the photographic fog toner at each print job and abandon operation.And, can when 500 pages of every printings, carry out a photographic fog toner and abandon operation.And, can provide button to abandon operation with starting photographic fog toner, so that abandoning operation, the photographic fog toner operates starting by the user.
In the present embodiment, developing voltage and charging voltage are switched, to produce the voltage difference that is enough to be used in abandoning the photographic fog toner on the basis that hypothesis adjusting vane voltage switches thus.About voltage difference, can make following modification.
Be used for the absolute value of the adjusting vane voltage Vbl-1 during the photographic fog toner abandons less than the absolute value for the adjusting vane voltage Vbl-0 during printing, and less than the absolute value that is used for the developing voltage Vdv-1 during the photographic fog toner abandons, as mentioned above (Fig. 5).With regard to this respect, if the absolute value of developing voltage Vbl-1 (be used for photographic fog toner abandon during) also can keep developing voltage constant less than the absolute value (during being used for printing) of developing voltage Vdv-0.In other words, as shown in Figure 5, during the photographic fog toner abandoned, the absolute value that only needs the large and adjusting vane voltage of voltage difference between adjusting vane voltage and the developing voltage got final product less than the absolute value of developing voltage.When voltage difference became large, the photographic fog toner more may move to developer roll 12.
And, can according to variety of way determine the photographic fog toner abandon during in the combination of photosensitive drums voltage and developing voltage, as long as the absolute value of developing voltage is less than the absolute value of photosensitive drums voltage.In the example of Fig. 5, photosensitive drums voltage switches to Vdr-1 and developing voltage but switches to Vdv-1, and photosensitive drums voltage does not switch and developing voltage switches to Vdv-1 and also is fine from Vdr-0.Photosensitive drums voltage switches to Vdr-1 and developing voltage also is not fine from the Vdv-0 switching.Photosensitive drums voltage is not fine from the Vdv-0 switching from Vdr-0 switching and developing voltage yet.
With regard to this respect, consider the combination of photosensitive drums voltage and developing voltage, when the absolute value little (comparing with photosensitive drums voltage) of developing voltage and when voltage difference is large therebetween, the photographic fog toner more may move to photosensitive drums 1.Therefore, preferably, during the photographic fog toner abandons, the absolute value of the absolute value of adjusting vane voltage (IVbl-1|), developing voltage (| Vdv-1|) absolute value (IVdr-1|) with photosensitive drums voltage satisfies following relation:
|Vdr-1|>|Vdv-1|≥|Vbl-1|。
Voltage difference between voltage difference between adjusting vane voltage and the developing voltage and photosensitive drums voltage and the developing voltage is preferably large as much as possible.With regard to this respect, adjusting vane voltage Vbl-1 can be 0V.
And, during the photographic fog toner abandons in, adjusting vane voltage equals developing voltage (that is, voltage difference is 0) therebetween and also is fine.In this case, the photographic fog toner on the developer roll 12 does not attracted to adjusting vane 13, and passes through adjusting vane 13 when adhering to developer roll 12.With regard to this respect, photosensitive drums voltage is switched by switching charging voltage.
As mentioned above, according to the first embodiment, switch between the voltage of corresponding voltage during abandoning for the voltage during printing with for the photographic fog toner.During the photographic fog toner abandoned, voltage was set up, thereby effectively caused low electric charge toner and reverse charging toner in the developing cell 2 to shift to developer roll 12.Therefore, can effectively abandon the photographic fog toner from developing cell 2, the result is the high quality graphic that can obtain not have photographic fog.
With regard to this respect, in the present embodiment, as mentioned above, switch adjusting vane voltage, so that the absolute value that is used for the adjusting vane voltage Vbl-1 during the photographic fog toner abandons is less than the absolute value of the adjusting vane voltage Vbl-0 during being used for printing.But, can followingly make amendment.In this modification, developing voltage switches so that in during the photographic fog toner abandons the absolute value of developing voltage greater than the absolute value of adjusting vane voltage.In this case, photosensitive drums voltage also switches, so that the toner on the developer roll 12 adheres to the surface of photosensitive drums 1.
More specifically, in (during non-image formation), adjusting vane voltage does not switch during the photographic fog toner abandons.But the absolute value of developing voltage switches to the absolute value greater than adjusting vane voltage.For example, the adjusting vane voltage Vbl-0 during be used for printing be-during 300V, the adjusting vane voltage Vbl-1 during abandoning for the photographic fog toner (=Vbl-0) also be-300V.Developing voltage Vdv-0 during being used for printing is-200V, and the developing voltage Vdv-1 that is used for during the photographic fog toner abandons is-500V.In this case, satisfy | Vbl-1|≤| Vdv-1|.
With regard to this respect, because photosensitive drums voltage Vdr-0 is-500V and because photosensitive drums voltage and developing voltage preferably satisfy relation | Vdr-1|〉| Vdv-1|, charging voltage for example is set to-1400V, so that photosensitive drums voltage Vdr-1 is-900V.
As mentioned above, when satisfying relation | Vbl-1|≤| during Vdv-1|, the photographic fog toner does not attracted to adjusting vane 13.And, when satisfying relation | Vdr-1|〉| during Vdv-1|, can shift to photosensitive drums 1 end through the photographic fog toner of adjusting vane 13, that is, be dropped.Therefore, when satisfying | Vdr-1|〉| Vdv-1| 〉=| during Vbl-1|, can abandon the photographic fog toner that exists in the developing cell 2.For this reason, above-described embodiment and its modification only are examples, and adjusting vane voltage, developing voltage and photosensitive drums voltage can be set up when needed, thereby satisfy relation: IVdr-1|〉| Vdv-1| 〉=| Vbl-1|.
With regard to this respect, when adjusting vane voltage Vbl-1 was identical with developing voltage Vdv-1, voltage difference therebetween was 0.Therefore, the lip-deep photographic fog toner of developer roll 12 does not attracted to adjusting vane 13, and passes through adjusting vane 13 when adhering to developer roll 12.Owing to this reason, as long as satisfy lower relation of plane | Vbl-1|≤| Vdv-1|, then the photographic fog toner does not attracted to adjusting vane 13.
The second embodiment
Next, the second embodiment of the present invention is described.The assembly identical with the assembly of the first embodiment has been endowed identical reference number, and will omit the explanation to them.About operation and the advantage identical with the first embodiment, with the explanation of omitting them.
Figure 11 is the block diagram that the control system of image processing system according to a second embodiment of the present invention is shown.
In the first embodiment, the configuration that is used for abandoning the photographic fog toner has been described.Yet in the low-humidity environment (for example, the humidity 10%), the toner that overcharges (that is, high electric charge toner) may cause stain.Therefore, in this second embodiment, the configuration that is used for abandoning this stain toner is described.
As shown in figure 11, in a second embodiment, charging voltage control module 21, developing voltage control module 22 and adjusting vane control module 23 link to each other with voltage switch unit 41.Voltage switch unit 41 comprises that printing voltage setting unit 42 and stain toner abandon voltage setting unit 44.According to the instruction that comes from record control unit 30, switch between the voltage (remain on the stain toner and abandon voltage setting unit 44) of voltage switch unit 41 during abandoning for the voltage during printing (remain on and print voltage setting unit 42) with for the stain toner, this switching is apprised of to charging voltage control module 21, developing voltage control module 22 and adjusting vane voltage control unit 23.The voltage that charging voltage control module 21, developing voltage control module 22 and adjusting vane voltage control unit 23 are informed according to voltage switch unit 41 arranges output voltage.
Other configurations are identical with the first embodiment, and therefore omit the description to it.
Next, will the operation of the image processing system 100 of the second embodiment be described.With regard to this respect, printing is identical with the first embodiment, and therefore omits the description to it.
And it is identical with the toner charge distribution among the first embodiment (Fig. 4) that the toner charge on the developer roll 12 in the toner layer distributes.More specifically, after carrying out the low-density printing, the width of CHARGE DISTRIBUTION increases, and the probability that exists of low electric charge toner and high electric charge toner increases.
In print processing, when high electric charge toner adhered to photosensitive drums 1, the voltage difference between the territory, non-exposed area of toner and photosensitive drums 1 was little.Therefore, if CHARGE DISTRIBUTION is shifted to a higher side, the probability that toner adheres to the non-image areas of recording medium 3 increases.The phenomenon that high electric charge toner (having greater than the electric charge that charges normal toner) adheres to the background (that is, non-image areas) of image is called as " stain ".Can cause the high electric charge toner of stain to be called as " stain toner " (that is the developer that, causes stain).The stain toner also comprises the toner (being called easy charging toner) that trends towards being overcharged to become high electric charge toner.
In the present embodiment, voltage during charging voltage, developing voltage and the adjusting vane voltage voltage during be used for to print switches to and abandons for the stain toner, thus during being different from printing during in optionally abandon stain toner (that is, high electric charge toner or the toner that easily charges).In other words, charging voltage, developing voltage and adjusting vane voltage switch to for the predetermined voltage during the non-image formation from the voltage that is used for during image forms, thereby effectively abandon the stain toner from developing cell 2.
Described in the first embodiment, " image forms operation " means the operation of using the toner formation toner image that charges normal on the photosensitive drums 1, and comprises based on the printing of view data formation toner image (will be transferred to recording medium 3) and the operation that forms the compensating pattern such as color displacement compensating pattern and image density compensating pattern.Charging voltage, developing voltage, adjusting vane voltage and the service voltage that is used for these operations is for the voltage during the image formation (particularly, for the voltage during printing).
And term " non-image formation operation " means that being different from above-mentioned image forms the operation that operates.During " stain toner abandon during " is set to non-image formation during (that is, be used for non-image formation operation during) a certain.That wherein voltage switches from the voltage that is used for during image forms during the change in voltage during the stain toner abandons.In other words, during the change in voltage be a part during the non-image formation.With regard to this respect, in can being arranged on during image processing system 100 driven non-image formation during the change in voltage arbitrarily during.
Next, the relation between photosensitive drums voltage, developing voltage and the adjusting vane voltage during using description to the stain toner and abandoning.
Figure 12 shows the chart of according to a second embodiment of the present invention photosensitive drums voltage, developing voltage and adjusting vane voltage Relations Among.
In Figure 12, to compare with the relevant voltage (illustrating by a dotted line) during be used for printing, the example of photosensitive drums voltage, developing voltage and adjusting vane voltage in during the stain toner abandons is illustrated by solid line.
During printing (in common print processing), described in the first embodiment, adjusting vane voltage Vb-0 is set to-300V and developing voltage Vdv-0 be for being set to-200V so that therebetween voltage difference be-100V (=(300V)-(200V)).And photosensitive drums voltage Vdr-0 is set to-500V so that the voltage difference between photosensitive drums voltage Vdr-0 and the developing voltage Vdv-0 be-300V (=(500V)-(200V)).Voltage difference between sub-image electromotive force Vdr-e and the developing voltage Vdv-0 is+100V (=(100V)-(200V)), so that sub-image is developed.
Contrast ground, with print during compare, in the process, the voltage difference between adjusting vane voltage Vbl-2 and the developing voltage Vdv-2 increased during the stain toner in during non-image formation abandoned.Like this, form large electric field, wherein adjusting vane 13 ends with respect to the polarity of developing blade 12 with to charge normal toner identical.Therefore reverse charging toner (non-stain toner) attracted to adjusting vane 13.Instead, high electric charge toner is maintained on the developer roll 12 (that is, not attracteding to adjusting vane 13), and passes through easily adjusting vane 13.And because adjusting vane voltage, easily the toner of charging is endowed electric charge, and through adjusting vane 13.Therefore, the stain toner in the developing cell 2 increases through the probability of adjusting vane 13.
In the present embodiment, adjusting vane voltage Vbl-2 in during the stain toner abandons is-500V, and the developing voltage Vdv-2 in during the stain toner abandons is set to-300V so that the voltage difference between adjusting vane voltage Vbl-2 and the developing voltage Vdv-2 be-200V (=(500V)-(300V)).
Next, with the CHARGE DISTRIBUTION of the toner in the toner layer of developer roll 12 in during describing the stain toner and abandoning.
Figure 13 illustrates according to the second embodiment, during the stain toner abandons in, the chart of the CHARGE DISTRIBUTION of toner in the toner layer of developer roll 12.
The electric charge that Figure 13 shows toner in the toner layer on the developer roll during the stain toner abandons (namely, when the voltage during being used for the stain toner and abandoning is set up) distribution and printing during the distribution of (, when the voltage during being used for printing is set up).With compare during the printing shown in the dotted line E, during the stain toner shown in the solid line F abandons in the CHARGE DISTRIBUTION of toner move (that is, the left side of Figure 13) to a higher lateral deviation.Therefore, the probability that exists of high electric charge toner increases in should be appreciated that during the stain toner abandons.Thereby should be appreciated that the stain toner in the developing cell 2 increases through developing blade 13 and the probability that moves on to the surface of developer roll 12.
And, during the stain toner abandons in, the voltage difference between photosensitive drums voltage Vdr-2 and the developing voltage Vdv-2 is less than the voltage difference during printing.Like this, stain toner (adhering to developer roll 12) is attracted to increase to photosensitive drums 1 and the probability that moves to photosensitive drums 1 by electricity.With regard to this respect, if the voltage difference between photosensitive drums voltage Vdr-2 and the developing voltage Vdv-2 is minimum, the toner that charges normal also moves to photosensitive drums 1.Therefore, the voltage difference between photosensitive drums voltage Vdr-2 and the developing voltage Vdv-2 preferably is set to optionally cause the stain toner to shift to the voltage difference of photosensitive drums 1.
In the present embodiment, photosensitive drums voltage Vdr-2 is set to-400V, and developing voltage Vdv-2 is set to-300V so that the voltage difference between photosensitive drums voltage Vdr-2 and the developing voltage Vdv-2 be-100V (=(400V)-(300V)).In order to obtain-the photosensitive drums voltage Vdr-2 of 400V, apply charging voltage Vch-2 with-900V to charging roller 11.
Next, with time sequential routine of the corresponding component in during describing the stain toner and abandoning.
Figure 14 A to 14F shows a sequential chart, this sequential chart has illustrated according to a second embodiment of the present invention, in during the photographic fog toner abandons, the time sequential routine of luminous, the charging voltage of ID motor 17, LED 15, photosensitive drums voltage, developing voltage and adjusting vane voltage.
At first, in response to the print job start signal from record control unit 30, print job begins, and ID motor 17 start working (t4).This causes photosensitive drums 1, charging roller 11, developer roll 12 and toner supplying roller 18 to begin rotation.Synchronous with the rotation starting, the charging voltage Vch-0 during being used for printing is applied to charging roller 11.By applying for the charging voltage Vch-0 during printing, the surface of photosensitive drums 1 is charged to for the photosensitive drums voltage Vdr-0 during printing.Simultaneously (at moment t4), the developing voltage Vdv-0 during being used for printing is applied to developer roll 12, and the adjusting vane voltage Vbl-0 during being used for printing is applied to adjusting vane 13.Like this, L0 begins during the printing.
Then, LED 15 begins light emission operation according to page sync signal and view data.When LED 15 was luminous, the electromotive force of the irradiation area of photosensitive drums 1 dropped to sub-image electromotive force Vdr-e, and forms sub-image.Sub-image is by toner development, and the result forms toner image.When LED 15 end light emission operation, L0 finishes (t5) during the printing.
At moment t5, when ID motor 17 keeps work, the charging voltage Vch-2 during charging voltage switches to and abandons for the stain toner.By switching charging voltage, the photosensitive drums voltage Vdr-2 during photosensitive drums voltage is switched to and abandons for the stain toner.And, at moment t2, the developing voltage Vdv-2 during developing voltage switches to and abandons for the stain toner, and adjusting vane voltage switches to the adjusting vane voltage Vbl-2 during abandoning for the stain toner.Like this, L2 began during the stain toner abandoned.
Here, the example that developing voltage and adjusting vane voltage and charging voltage is switched is simultaneously made description.But, can provide time delay therebetween, this time delay is rotated the time of distance between charging roller 11 and the developer roll 12 along the circumference of photosensitive drums 1 corresponding to photosensitive drums 1.
(L2) proceeded to constantly t6 always during the stain toner abandoned.At moment t6, ID motor 17, charging voltage, developing voltage, photosensitive drums voltage and adjusting vane voltage are closed.Like this, print job finishes, and the closed condition continuation, until receive next print job.With regard to this respect, during above-mentioned stain toner abandons in (L2), luminous the closing of LED 15, and on photosensitive drums 1, do not form sub-image.
When (L2) was elongated during the stain toner abandons, the stain toning dosage that abandons increased.But, when (L2) was elongated during the stain toner abandons, the rotation of photosensitive drums 1 increased, and therefore, the lost of life of photosensitive drums 1 and printing output capacity step-down.Therefore, be necessary application etc. according to image processing system 100 suitably regulate the stain toner and abandon during the length of (L2).(L2) was preferably more than developer roll 12 and revolves the summation that turn around required time and toner supplying roller 18 revolve the required time of turning around during the stain toner abandoned.
As mentioned above, the preferred example in the time sequential routine of corresponding component in having described during the stain toner abandons.
Next, with another preferred example in time sequential routine of corresponding component in during describing the stain toner and abandoning.
Figure 15 A to 15F shows sequential chart, this sequential chart has illustrated another example according to a second embodiment of the present invention, in during the photographic fog toner abandons, the time sequential routine of luminous, the charging voltage of ID motor 17, LED 15, photosensitive drums voltage, developing voltage and adjusting vane voltage.Figure 16 A to 16F is synoptic diagram, illustrate according to the example shown in Figure 15 A to 15F, during the stain toner abandons in, the relation between photosensitive drums, developer roll and the charging roller.
At first, in response to the print job start signal from record control unit 30, print job begins, and ID motor 17 start working (t4).This causes photosensitive drums 1, charging roller 11, developer roll 12 and toner supplying roller 18 to begin rotation.Synchronous with the rotation starting, the charging voltage Vch-0 during being used for printing is applied to charging roller 11.By applying for the charging voltage Vch-0 during printing, the surface of photosensitive drums 1 is charged to for the photosensitive drums voltage Vdr-0 during printing.Simultaneously (at moment t4), the developing voltage Vdv-0 during being used for printing is applied to developer roll 12, and the adjusting vane voltage Vbl-0 during being used for printing is applied to adjusting vane 13.Like this, L0 begins during the printing.
Then, LED 15 begins light emission operation according to page sync signal and view data.When LED 15 was luminous, the electromotive force of the irradiation area of photosensitive drums 1 dropped to sub-image electromotive force Vdr-e, and forms sub-image.Sub-image is by toner development, and the result forms toner image.When LED 15 finished light emission operation, L0 finished (t5) during the printing.
At moment t5, photosensitive drums 1, charging roller 11 and developer roll 12 are in respectively the position shown in Figure 16 A.Herein, position alpha is defined in moment t5 in the face of the position on the photosensitive drums 1 of charging roller 11.At moment t5, charging voltage switches to Vch-2.After this, the regional γ on the downstream end of the lip-deep position alpha of photosensitive drums 1 has the surface potential of Vdr-2.
And when photosensitive drums 1 was further rotated (t2 '), photosensitive drums 1, charging roller 11 and developer roll 12 were in respectively the position shown in Figure 16 B.At this state, the position alpha on the photosensitive drums 1 is in the face of developer roll 12.At moment t5 ', developing voltage switches to Vdv-2.After this, when the regional DR1 on the downstream end of position alpha (being positioned on the surface of photosensitive drums 1) faced developer roll 12, stain toner (on the developer roll 12) adhered to the surface on the surface of photosensitive drums 1.
And at moment t6, photosensitive drums 1, charging roller 11 and developer roll 12 are in respectively the position shown in Figure 16 C.Position β is defined as the end, downstream of regional DR1.When position β faced charging roller 11, charging voltage was closed.With regard to this respect, print (for example, receiving in the situation of next print job at image processing system 100) if continue to carry out, charging voltage switches to Vch-0.
And at moment t6 ', photosensitive drums 1, charging roller 11 and developer roll 12 are in respectively the position shown in Figure 16 D.When position β when the developer roll 12, developing voltage is closed, and the stain toner finishes during abandoning.
The switching sequence of adjusting vane voltage is identical with the switching sequence of developing voltage.But, shown in Figure 16 E, according to the distance B V1 that developer roll 12 is faced between the position of adjusting vane 13 in the face of position and the developer roll 12 of photosensitive drums 1, adjusting vane voltage can switch to switch different sequential from developing voltage.It also is possible that ID motor 17 cuts out afterwards at moment t6 ' (that is, when developing voltage and adjusting vane voltage are closed).
Next, when changing relevant voltage, carry out the experiment that the stain toner abandons operation with describing.
Figure 17 is the form that illustrates according to the experimental result of second embodiment of the invention.
In this experiment, in the combination that changes adjusting vane voltage, developing voltage and charging voltage, carry out the stain toner and abandon operation.After the stain toner abandons operation, carry out to print, and visually assess the degree of improving the stain on the recording medium 3 (with abandon operation at the stain toner before stain on the print record medium 3 compare).Net result is shown among Figure 17.
Adjusting vane voltage, developing voltage and charging voltage are switched as shown in figure 12.During printing, charging voltage is-1000V, and photosensitive drums voltage is-500V, and developing voltage is-and 200V and adjusting vane voltage is-300V.
The measurement of following execution stain.When image processing system 100 carries out image density were 0% printing, image processing system 100 stopped.And after the development sub-image and before the image that transfer printing is developed, the adhesive tape " Scotch Mending Tape " (Sumitomo3M Ltd. manufacturing) that is called as stain sampling band is attached to the surface of photosensitive drums 1.Then, stain sampling band (having adhered to toner) is attached to blank sheet of paper.In order to compare, the adhesive tape (being called the contrast attenation factor) that is not attached to photosensitive drums also is attached to identical blank sheet of paper.Then, using the measurement diameter is spectrophotometric tintmeter " CM-2600d " (Konica-Minolta Ltd. manufacturing) the measurement photographic fog sampling band of 8mm and the color phase differential between the contrast attenation factor.Calculate aberration (L*a*b color coordinate system) according to following formula:
ΔE＝(ΔL 2+Δa 2+Δb 2) 1/2
The standard of improving (solution) degree for assessment of stain is as follows:
The photographic fog rank The scope of Δ E
5 0.0≤ΔE<0.5
4 0.5≤ΔE<1.0
3 1.0≤ΔE<1.5
2 1.5≤ΔE<2.0
1 2.0<ΔE
[test 1]
In test 1, charging voltage switches to-900V (that is, photosensitive drums voltage is switched to-400V), and developing voltage is-300V.In this case, the stain rank is rank 1, that is, stain is not solved substantially.Reason is as follows.Voltage difference between photosensitive drums voltage and the developing voltage is-100V (=(400V)-(300V)), this is less than the voltage difference during printing, and the stain toner that therefore adheres to developer roll 12 moves to photosensitive drums 1 and is dropped.But, the stain toner that exists on the developing cell 2 is not dropped, and therefore, the part of the stain toner that exists in developing cell 2 arrives photosensitive drums 1 through adjusting vane 13 and in printing, thereby causes stain.
[test 2]
In test 2, adjusting vane voltage switches to-500V.In this case, the stain rank is rank 3, and photographic fog broadly appropriate solves.Reason is as follows.Voltage difference between adjusting vane voltage and the developing voltage is-300V (=(500V)-(200V)), thereby form large electric field, wherein adjusting vane 13 ends with respect to the polarity of developing blade 12 with to charge normal toner identical.Like this, the stain toner in the developing cell 2 more may adhere to developer roll 12 and more may move to photosensitive drums 1 (that is, being dropped), so that the stain that abandons toning dosage increases.
[test 3]
In test 3, adjusting vane voltage switches to-500V, and developing voltage switches to-300V.In this case, the photographic fog rank is rank 4, and tests 2 and compares to some extent and to increase.Reason is as follows.Because the voltage difference between adjusting vane voltage and the developing voltage is-200V (=(500V)-(300V)), greater than the voltage difference in during printing, the stain toner in the developing cell 2 more may adhere to developer roll 12.And, because the voltage difference between photosensitive drums voltage and the developing voltage is-200V (=(500V)-(300V)), this is less than the voltage difference during printing, and the stain toner that adheres to developer roll 12 more may be shifted to photosensitive drums 1, so that the stain that abandons toning dosage increases.
[test 4]
The test 4 in, adjusting vane voltage switches to-500V, and charging voltage switch to-900V (that is, photosensitive drums voltage switch to-400V).In this case, the stain rank is rank 4, and tests 3 basic identical.Reason is as follows.Voltage difference between adjusting vane voltage and the developing voltage is-300V (=(500V)-(200V)), this is greater than the voltage difference during printing, and the voltage difference between adjusting vane voltage and the developing voltage is-200V (=(400V)-(200V)), this is less than the voltage during printing.Like this, the stain toner (removing from developing cell 2) that adheres to developer roll 12 more may be shifted to photosensitive drums 1, so that the stain that abandons toning dosage increases.
[test 5]
In test 5, adjusting vane voltage switches to-500V, and developing voltage switch to-300V and charging voltage switch to-900V (that is, photosensitive drums voltage switch to-400V).In this case, the stain rank is rank 5, and this is fabulous result.Reason is as follows.Voltage difference between adjusting vane voltage and the developing voltage is-200V (=(500V)-(300V)), this is greater than the voltage difference during printing.And the voltage difference between photosensitive drums voltage and the developing voltage is-100V (=(400V)-(300V)), this is less than the voltage difference during printing.Like this, the stain toner that exists in the developing cell 2 more may be shifted to developer roll 12, and the stain toner that adheres to developer roll 12 more may be shifted to photosensitive drums 1.Therefore, the stain toning dosage that abandons increases.
[test 6]
In test 6, do not provide during the change in voltage.In this case, the stain rank is rank 1.More specifically, the assessment of stain is also poorer than above-mentioned test 1.
In above-mentioned test 1, switch developing voltage and charging voltage.But, the voltage difference between adjusting vane voltage and the developing voltage does not increase, and therefore the stain toner can not pass through adjusting vane 13.
In above-mentioned test 2, the voltage difference between adjusting vane voltage and the developing voltage increases, and therefore the stain toner might pass through adjusting vane 13.
In above-mentioned test 3, adjusting vane voltage and developing voltage switch, so that the voltage difference between adjusting vane voltage and the developing voltage is greater than the voltage difference during printing, and the voltage difference between developing voltage and the photosensitive drums voltage is less than the voltage difference during printing.Like this, the stain toner more may and more may adhere to photosensitive drums 1 through adjusting vane 13.(comparatively, when the voltage difference between developing voltage and the photosensitive drums voltage is large, the more impossible photosensitive drums 1 of shifting to of stain toner).
In above-mentioned test 4, switch adjusting vane voltage and charging voltage (that is, photosensitive drums voltage), so that the voltage difference between developing voltage and the photosensitive drums voltage is less than test 2.Therefore, the stain toner more may adhere to photosensitive drums 1 (comparatively, when the voltage difference between developing voltage and the photosensitive drums voltage is large, the more impossible photosensitive drums 1 of shifting to of stain toner).
In above-mentioned test 5, switch adjusting vane voltage, developing voltage and charging voltage.Like this, the stain toner more may pass through adjusting vane 13, and the stain toner more may adhere to photosensitive drums 1 (comparatively, when the voltage difference between developing voltage and the photosensitive drums voltage is large, the more impossible photosensitive drums 1 of shifting to of stain toner).
In the present embodiment, adjusting vane voltage Vbl-2 is set to-500V, and photosensitive drums voltage Vdr-2 is set to-400V, and therefore the absolute value of photosensitive drums voltage less than the absolute value of adjusting vane voltage.Therefore, electric charge (from adjusting vane 13) is endowed low electric charge toner and the reverse charging toner on the developer roll 12.Contrast ground, electric charge is not given by (from photosensitive drums 1) and is charged normal toner, and this charges normal toner and is retained on the developer roll 12 and does not move to photosensitive drums 1, and therefore, this toner that charges normal is not overcharged.
And even separate on the surface of the developer roll 12 of stain toner from the upstream extremity of contact portion between developer roll 12 and the photosensitive drums 1, but this stain toner still attracted to photosensitive drums 1 (not attracteding to adjusting vane 13).
And, because the absolute value of photosensitive drums voltage less than the absolute value of adjusting vane voltage, is shifted to photosensitive drums 1 through adjusting vane 13 and the stain toner that is retained on the developer roll 12.Therefore, the stain toner more may and more may be shifted to photosensitive drums 1 through adjusting vane 13.
Above-mentioned experimental results only illustrates the example of each voltage combination.Voltage difference between voltage difference between adjusting vane voltage and the developing voltage and photosensitive drums voltage and the developing voltage is related to the movement of stain toner, and therefore the solution of stain is affected by relevant voltage.
Can realize from above-mentioned experimental results, obtain to solve to a certain extent the advantage of stain by switching adjusting vane voltage, and by switching other advantages in developing voltage and charging voltage (except the adjusting vane voltage) photographic fog that achieves a solution.
And, preferably, further switch the service voltage that supplies to toner supplying roller 18.In this case, the supply voltage Vsp-0 during being used for printing for example is set to-300V, and it is higher than developing voltage.Service voltage Vsp-2 during being used for the stain toner and abandoning for example is-500V, and its absolute value is greater than developing voltage, and the voltage difference of itself and developing voltage is large.Therefore in this case, the stain toner can be shifted to developer roll 12 from toner supplying roller 18, and becomes and can be discarded near the toner supplying roller 18 stain toner.
Thereby the stain toner in the whole developing cell 2 can abandon operation by a stain toner and abandon, and therefore, the interval that the stain toner abandons between the operation can prolong.In other words, the interval between during the change in voltage can prolong.In this example, service voltage and adjusting vane voltage can arrange mutually the samely, so that adjusting vane voltage can obtain by identical power supply with service voltage.Alternatively, the service voltage Vsp-0 during be used for printing for example can be set to-350V, and the service voltage Vsp-2 that is used for during the photographic fog toner abandons for example can be set to-550V, and this is different from adjusting vane voltage Vbl-0 and Vbl-2.
The description of present embodiment only is example, and corresponding voltage is not limited to this.Thereby voltage can be set up according to voltage output range for the treatment of conditions (such as the attribute of charge characteristic or the respective rollers of toner), environmental baseline (such as temperature or humidity), power supply etc. and effectively abandon the stain toner.
In the present embodiment, in the print job process, when printing finishes, carry out the stain toner and abandon operation.But, can in the print job process, before printing begins, carry out the stain toner and abandon operation.Alternatively, can also between print job, carry out independently the stain toner and abandon operation.Can also carry out in short time the stain toner at each print job and abandon operation.And, can when 500 pages of every printings, carry out a stain toner and abandon operation.And, can provide button to abandon operation with starting stain toner, so that abandoning operation, the stain toner operates starting by the user.
In the present embodiment, switch developing voltage and charging voltage, to produce the voltage difference that is enough to be used in abandoning the stain toner on the basis that hypothesis adjusting vane voltage is switched thus.About voltage difference, can make following modification.
During the stain toner abandons, the absolute value of adjusting vane voltage Vbl-2 is greater than the absolute value of developing voltage, and voltage difference (between adjusting vane voltage and the developing voltage) is greater than the voltage difference during printing.Therefore, with print during compare, the stain toner more may be shifted to developer roll 12.
And, during the stain toner abandons in, the absolute value of photosensitive drums voltage is greater than the absolute value of developing voltage, and voltage difference therebetween is less than the voltage difference during printing.Therefore, high electric charge toner is optionally shifted to photosensitive drums 1, and the toner that charges normal is retained on the developer roll 12, and with print during compare, high electric charge toner more may be shifted to photosensitive drums 1.
Therefore, the combination of adjusting vane voltage, photosensitive drums voltage and developing voltage during can being identified for the stain toner and abandoning according to various forms, as long as the absolute value of photosensitive drums voltage is greater than the absolute value of developing voltage, the absolute value of adjusting vane voltage gets final product greater than the voltage difference during printing greater than absolute value and the voltage difference between adjusting vane voltage and the developing voltage of developing voltage.More preferably, the voltage difference between photosensitive drums voltage and the developing voltage is less than the voltage difference in during printing.With regard to this respect, switch photosensitive drums voltage by switching charging voltage.
As mentioned above, according to the second embodiment, switch between the voltage of corresponding voltage during abandoning for the voltage during printing with for the stain toner.During the stain toner abandons, voltage is set up, thereby effectively so that the high electric charge toner in the developing cell 2 and the toner that easily charges are shifted to developer roll 12.Therefore, the stain toner can abandon effectively from developing cell 2, and the result can obtain not have flecked high quality graphic.
With regard to this respect, in the present embodiment, as mentioned above, adjusting vane voltage is switched, so that the absolute value of the adjusting vane voltage Vbl-2 during being used for the stain toner and abandoning is greater than the absolute value of the adjusting vane voltage Vbl-0 during being used for printing.But, can carry out following modification.In this modification, adjusting vane voltage does not switch, but developing voltage switches so that the stain toner abandon during in the absolute value of developing voltage less than the absolute value of adjusting vane voltage.In this case, photosensitive drums voltage also switches, so that the toner on the developer roll 12 adheres to the surface of photosensitive drums 1.
More specifically, in (during non-image formation), adjusting vane voltage does not switch during the stain toner abandons.But developing voltage switches, so that the voltage difference between adjusting vane voltage and the developing voltage increases.For example, the adjusting vane voltage Vbl-0 during be used for printing be-300V, and the adjusting vane voltage Vbl-2 during abandoning for the stain toner be-300V (=Vbl-0).Developing voltage Vdv-0 during being used for printing is-200V, and the developing voltage Vdv-2 that is used for during the stain toner abandons is-100V.In this case, satisfy lower relation of plane: | Vbl-2|〉| Vdv-2|.
With regard to this respect because photosensitive drums voltage Vdr-0 for-500V and because the voltage difference between developing voltage and the photosensitive drums voltage preferably less than the voltage difference during printing, charging voltage for example is set to-700V, so that Vdr-2 is-200V.
When satisfying relation | Vbl-2| | Vdv-2| and when voltage difference therebetween during the stain toner abandons greater than during printing the time, the stain toner does not attracted to adjusting vane 13.And, when satisfying relation | Vdr-2| | Vdv-2| and when voltage difference therebetween during the stain toner abandons less than during printing the time, can shift to photosensitive drums 1 through the stain toner of adjusting vane 13.Therefore, when satisfying | Vdr-2| | Vdv-2| and | Vbl-2|〉| during Vdv-2|, can abandon the stain toner in the developing cell 2.For this reason, the second embodiment and its modification only are examples, and only need to be during being used for image and forming (during the printing) voltage and be used for non-image formation during switch between the voltage of (stain toner abandon during), thereby satisfy relation | Vdr-2|〉| Vdv-2| and | Vbl-2|〉| Vdv-2|.
The 3rd embodiment
Figure 18 is the block diagram according to the control system of the image processing system of third embodiment of the invention.The assembly identical with the assembly of the first or second embodiment has been endowed identical reference number, and will omit the explanation to it.About operation and the advantage identical with the first or second embodiment, omit the explanation to it.
In the 3rd embodiment, charging voltage control module 21, developing voltage control module 22 and adjusting vane control module 23 link to each other with voltage switch unit 51.Voltage switch unit 51 comprises printing voltage setting unit 52, the photographic fog toner abandons voltage setting unit 53 and the stain toner abandons voltage setting unit 54.According to the instruction that comes from record control unit 30, voltage during voltage switch unit 51 is selected to be used for printing (remain on and print voltage setting unit 52), be used for the voltage (remain on the photographic fog toner and abandon voltage setting unit 53) during the photographic fog toner abandons or be used for voltage (remain on the photographic fog toner and abandon voltage setting unit 54) during the stain toner abandons, these selections are apprised of to charging voltage control module 21, developing voltage control module 22 and adjusting vane voltage control unit 23.The voltage that charging voltage control module 21, developing voltage control module 22 and adjusting vane voltage control unit 23 are informed according to voltage switch unit 51 arranges output voltage.
Other configurations are similar to the first embodiment, and therefore omit the description to it.
Next, Description Image is formed the operation of device 100.Printing is identical with the first and second embodiment, and therefore omits the description to it.
In the present embodiment, voltage during charging voltage, developing voltage and the adjusting vane voltage voltage during be used for to print switches to and abandons for the photographic fog toner or be used for the stain toner and abandon during the voltage of voltage, thus during being different from printing during in optionally abandon photographic fog toner or stain toner.
Relation between photosensitive drums voltage in during the photographic fog toner abandons, developing voltage and the adjusting vane voltage is identical with the first embodiment.And the relation between photosensitive drums voltage, developing voltage and the adjusting vane voltage in during the stain toner abandons is identical with the second embodiment.Owing to these reasons, the explanation of voltage setting will be omitted.
Next, with during describing the photographic fog toner and abandoning and the stain toner abandon during in time sequential routine of corresponding component.
Figure 19 A to 19F shows sequential chart, and this sequential chart has illustrated a third embodiment in accordance with the invention, the time sequential routine of luminous, the charging voltage of ID motor 17, LED 15, photosensitive drums voltage, developing voltage and adjusting vane voltage.
At first, in response to the print job start signal from record control unit 30, print job begins, and ID motor 17 start working (t7).This causes photosensitive drums 1, charging roller 11, developer roll 12 and toner supplying roller 18 to begin rotation.Synchronous with the rotation starting, the charging voltage Vch-0 during being used for printing is applied to charging roller 11.By applying for the charging voltage Vch-0 during printing, the surface of photosensitive drums 1 is charged to for the photosensitive drums voltage Vdr-0 during printing.Simultaneously (at moment t7), the developing voltage Vdv-0 during being used for printing is applied to developer roll 12, and the adjusting vane voltage Vbl-0 during being used for printing is applied to adjusting vane 13.Like this, L0 begins during the printing.
Then, LED 15 begins light emission operation according to page sync signal and view data.When LED 15 was luminous, the electromotive force of the irradiation area of photosensitive drums 1 dropped to sub-image electromotive force Vdr-e, and forms sub-image.Sub-image is by toner development, and the result forms toner image.When LED 15 finished light emission operation, L0 finished (t8) during the printing.
At moment t8, when ID motor 17 keeps work, the charging voltage Vch-1 during charging voltage switches to and abandons for the photographic fog toner.By switching charging voltage, the photosensitive drums voltage Vdr-1 during photosensitive drums voltage is switched to and abandons for the photographic fog toner.And, at moment t8, the developing voltage Vdv-1 during developing voltage switches to and abandons for the photographic fog toner, and adjusting vane voltage switches to the adjusting vane voltage Vbl-1 during abandoning for the photographic fog toner.Like this, (L1) beginning during the photographic fog toner abandons.(L1) proceeded to constantly t9 during the photographic fog toner abandoned.During the photographic fog toner abandons in (L1), luminous the closing of LED 15, and on photosensitive drums 1, do not form sub-image.
And, at moment t9, when ID motor 17 keeps work, the charging voltage Vch-2 during charging voltage switches to and abandons for the stain toner.By switching charging voltage, the photosensitive drums voltage Vdr-2 during photosensitive drums voltage is switched to and abandons for the stain toner.And, at moment t8, the developing voltage Vdv-2 during developing voltage switches to and abandons for the stain toner, and adjusting vane voltage switches to the adjusting vane voltage Vbl-2 during abandoning for the stain toner.Like this, (L2) beginning during the stain toner abandons.(L2) proceeded to constantly t10 during the stain toner abandoned.At moment t10, ID motor 17, charging voltage, developing voltage, photoreceptor voltage and adjusting vane voltage are closed.Like this, print job is finished, and the closed condition continuation, until receive next print job.During the stain toner abandons (L2), luminous the closing of LED 15, and on photosensitive drums 1, do not form sub-image.
Here, the example that developing voltage and adjusting vane voltage and charging voltage is switched is simultaneously made description.But, can provide time delay therebetween, this time delay is rotated the time of distance between charging roller 11 and the developer roll 12 along the circumference of photosensitive drums 1 corresponding to photosensitive drums 1.
When (L2) was elongated during (L1) and stain toner abandoned during the photographic fog toner abandons, the photographic fog toner that abandons and stain toning dosage increased.But, when (L2) was elongated during (L1) during the photographic fog toner and stain toner abandon, the rotation of photosensitive drums 1 increased, therefore, and the lost of life of photosensitive drums 1 and print the output capacity step-down.Therefore, must suitably regulate the photographic fog toner and abandon according to application of image processing system 100 etc. during (L1) and stain toner abandon during the length of (L2).Preferably, (L2) revolved the summation that turn around required time and toner supplying roller 18 revolve the required time that turns around greater than developer roll 12 during (L1) and stain toner abandoned during each photographic fog toner abandoned.
The description of the 3rd embodiment only is example, and corresponding voltage is not limited to this.Thereby voltage can be set up according to voltage output range for the treatment of conditions (such as the attribute of charge characteristic or the respective rollers of toner), environmental baseline (such as temperature or humidity), power supply etc. and effectively abandon photographic fog toner and stain toner.
And, abandon the example that operation and stain toner abandon operation and be described in the print job process, when printing finishes, carrying out the photographic fog toner.But, also can be in the print job process before beginning, printing carries out that the photographic fog toner abandons operation and the stain toner abandons operation.Alternatively, can also between print job, carry out independently the photographic fog toner abandon the operation and the stain toner abandon operation.Can also carry out in short time at each print job that the photographic fog toner abandons operation and the stain toner abandons operation.And, can also when waiting, 500 pages of every printings carry out that photographic fog toner abandons operation and the stain toner abandons operation.And, can also provide button to abandon operation with starting photographic fog toner and the stain toner abandons operation, abandon to operate and operate starting by the user so that the photographic fog toner abandons operation and stain toner.
And, although being abandoned the example that operation and stain toner abandon operation, continuous execution photographic fog toner is described, also can carry out individually the photographic fog toner in the corresponding time and abandon and operate and the stain toner abandons operation.For example, can be in the print job process before the beginning printing, carry out the photographic fog toner and abandon operation, and in the print job process, after printing finishes, carry out the stain toner and abandon operation.
As mentioned above, according to the 3rd embodiment, the voltage of corresponding voltage during being used for printing, be used for the voltage during the photographic fog toner abandons and be used for switching between the voltage during the stain toner abandons.More specifically, the voltage during being used for the photographic fog toner and abandoning is set up, and abandons low electric charge toner and reverse charging toner (in the developing cell 2) to the efficient of developer roll 12 thereby increase.Voltage during being used for the stain toner and abandoning is set up, thus increase abandon high electric charge toner and easily charging toner (in the developing cell 2) to the efficient of developer roll 12.Like this, can effectively abandon photographic fog toner and stain toner from developing cell 2, and thereby can obtain not have the high quality graphic of photographic fog or stain.
In above-mentioned the first to the 3rd embodiment, the example that the present invention is applied to printer has been described.But, the present invention can be applicable to MFP (multi-function printer), facsimile recorder, duplicating machine etc.
And for example, the present invention can be applicable to for example recycle the tandem type color printer that 4 developing apparatuses form coloured image at one, and uses intermediate transfer belt to form 4 circulation color printers of coloured image 4 circulations.
And the present invention also can be applicable to the contactless exploitation of single component or bi-component exploitation and the exploitation of single component contact.
Although described the preferred embodiments of the present invention in detail, obviously, can make the present invention and revise and improve and do not depart from the spirit and scope of the present invention of describing in claims.

Claims (2)

1. A kind of image processing system comprises:
The sub-image supporting body of carrying sub-image;
Charging member is applied in charging voltage and is configured to surface charging to described sub-image supporting body;
Developer carrier is applied in developing voltage and is configured to by so that developer adheres to the described sub-image of described image development; And
The developer adjustment means is applied in adjustment means and applies voltage and be configured to form at described developer carrier the layer of described developer,
Wherein, during non-image formation, described adjustment means is executed the absolute value that alive absolute value is less than or equal to described developing voltage,
Wherein, in the predetermined voltage During that arranges in during described non-image formation, described adjustment means is executed the described absolute value that alive described absolute value is less than or equal to described developing voltage,
Wherein, during described change in voltage in, the absolute value of the surface voltage of described sub-image supporting body is greater than the described absolute value of described developing voltage.
2. Image processing system according to claim 1, wherein, during described non-image formation in, it is mutually the same that described adjustment means is executed the polarity of alive polarity and described developing voltage.
3. image processing system according to claim 1 further comprises the voltage switch unit, and described voltage switch unit switches at least one in described charging voltage and the described developing voltage in during described change in voltage.
4. image processing system according to claim 1, wherein said voltage switch unit switches described charging voltage.
5. image processing system according to claim 3, the described surface voltage of wherein said sub-image supporting body and the difference between the described developing voltage during described change in voltage in than large in during described image forms.
6. image processing system comprises:
The sub-image supporting body of carrying sub-image;
Charging member is applied in charging voltage and is configured to surface charging to described sub-image supporting body;
Developer carrier is applied in developing voltage and is configured to by so that developer adheres to the described sub-image of described image development; And
The developer adjustment means is applied in adjustment means and applies voltage and be configured to form at described developer carrier the layer of described developer,
Wherein, during non-image formation, described adjustment means is executed alive absolute value greater than the absolute value of described developing voltage, and the described adjustment means difference that applies voltage and described developing voltage is than large in during image forms,
Wherein, in the predetermined voltage During that arranges in during described non-image formation, the absolute value of the surface voltage of described sub-image supporting body is greater than the described absolute value of described developing voltage.
7. image processing system according to claim 6, wherein, during described non-image formation in, described adjustment means is executed alive described absolute value greater than the absolute value of the surface voltage of described sub-image supporting body.
8. image processing system according to claim 6, wherein, in the predetermined voltage During in during described non-image formation, described adjustment means is executed alive described absolute value greater than the described absolute value of described developing voltage, and described adjustment means applies described poor than large in during described image forms between voltage and the described developing voltage.
9. image processing system according to claim 8 further comprises the voltage switch unit, and described voltage switch unit switches for the described charging voltage during the described change in voltage and at least one of described developing voltage.
10. image processing system according to claim 8, wherein, in during described change in voltage, the absolute value of the surface voltage of described sub-image supporting body is greater than the described absolute value of described developing voltage, and the difference of the described surface voltage of described sub-image supporting body and described developing voltage is than medium and small during forming at described image.
11. image processing system according to claim 8, wherein, during described change in voltage in, described adjustment means is executed alive described absolute value greater than the absolute value of the surface voltage of described sub-image supporting body.
12. image processing system according to claim 10, wherein, during described change in voltage in, described adjustment means is executed alive described absolute value greater than the described absolute value of the described surface voltage of described sub-image supporting body.
13. image processing system according to claim 8, the described surface voltage of wherein said sub-image supporting body has identical polarity with described developing voltage during described change in voltage.
CN200810168732.6A 2007-09-26 2008-09-26 Image forming apparatus Expired - Fee Related CN101398657B (en)

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JP6624802B2 (en) * 2014-06-13 2019-12-25 キヤノン株式会社 Image forming device
JP6452106B2 (en) * 2014-09-01 2019-01-16 キヤノン株式会社 Image forming apparatus
JP5968480B1 (en) * 2015-02-27 2016-08-10 キヤノン株式会社 Image forming apparatus
JP6332116B2 (en) * 2015-04-07 2018-05-30 京セラドキュメントソリューションズ株式会社 Image forming apparatus
JP6723138B2 (en) * 2016-10-24 2020-07-15 株式会社沖データ Image forming device
JP7171423B2 (en) 2018-12-25 2022-11-15 キヤノン株式会社 image forming device

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