CN201373979Y - Powder supply roller and developing device - Google Patents
Powder supply roller and developing device Download PDFInfo
- Publication number
- CN201373979Y CN201373979Y CN200920050840U CN200920050840U CN201373979Y CN 201373979 Y CN201373979 Y CN 201373979Y CN 200920050840 U CN200920050840 U CN 200920050840U CN 200920050840 U CN200920050840 U CN 200920050840U CN 201373979 Y CN201373979 Y CN 201373979Y
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- developer
- powder roller
- developer roll
- electric conductivity
- roller
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Abstract
The utility model provides a powder supply roller and a developing device with the powder supply roller, which are applied in the electro photography type image forming device of a copying machine and a printing machine. The developing device comprises a container for storing developer, a developing roller for supplying the developer to a photo conductor and a powder supply roller for supplying the developer to the developing roller, wherein the powder supply roller comprises a core tube and a plurality of fibers implanted into the surface of the core tube, The surfaces of the core tube and the fibers are conductive or semi conductive, and the surfaces of the top ends of the fibers are electric insulative. The purposes of prolonging the service life and stabilizing the electric quantity of the developer can be achieved with low price, and the generation of developer with opposite charges can be inhibited.
Description
Technical field
The utility model relate in a kind of image processing system that is applied in electrofax modes such as duplicating machine and printer for powder roller and developing apparatus.
Background technology
In the image processing system of electrofax modes such as duplicating machine and printer, use developing apparatus 1 as shown in Figure 5 usually.Developer roll 3 in developing apparatus 1 is laid in the electrostatic latent image that is formed on photosensitive drums 2 surfaces with tiny granular carbon dust, makes its video pictureization.Side face for powder roller 4 contacts with the side face of developer roll 3, carries out the supply of carbon dust.At the side face of developer roll 3, also have the top ends of scraper 5 to contact with it, by 6 pushings of pushing spring, form the carbon dust layer thickness of regulation.Around for powder roller 4, be provided with the carbon dust container 7 of storing carbon dust.Grid bias power supply 8,9 is provided for making carbon dust to move to the negative voltage of developer roll 3 and confession powder roller 4 statically.
Because carbon dust is the surface that physically is transported to developer roll 3, the surface that supplies powder roller 4 is for can physically keep the surface configuration of carbon dust better.Therefore, normally form around the metal tube core 10 of spongy layer 11 coverings by electric conductivity for powder roller 4.Developer roll 3 is provided with the rubber layer 13 of electrical insulating property around metal tube core 12, have protective seam 14 on rubber layer 13 outer peripheral faces.On the surface of photosensitive drums 2, form the conduct of electrical insulating property photosemiconductor layer as supporting body.
Fig. 6 illustrates the summary for powder roller manufacture method.Metal tube cores 10 such as insertion stainless steel are to the electric conductivity sponge block 15 that is cut into the quadrangular shape, and cutting the outer peripheral face that makes electric conductivity sponge block 15 is barrel surface, forms electric conductivity spongy layer 11 (with reference to Fig. 5 and Fig. 7).Electric conductivity spongy layer 11 is fixed to tube core 10 by the electric conductivity sticker.
Fig. 7 is depicted as developer roll 3 and for the state of the engaging piece 16 of the contact portion of powder roller 4.Form a plurality of recesses 18 that keep carbon dust 17 on the surface of electric conductivity spongy layer 11.The recess 18 on carbon dust 17 usefulness spongy layer surfaces is fed into the surface of developer roll 3, further by form electric field between developer roll 3 and donor rollers 4, physically is attached to developer roll 3.At this moment, on the surface of developer roll 3, the recess 18 on electric conductivity spongy layer 11 surfaces is retracted back, and the carbon dust 17 on developer roll surface is bigger by sliding contact and contact pressure, and in the recess 18 on electric conductivity spongy layer 11 surfaces, carbon dust 17 has the risk that is fixed.
Fig. 8 illustrates the method that forms electric field.For making the latent electrostatic image developing on the photoreceptor, the voltage that produces necessary potential difference (PD) is applied to developer roll 3.Usually at the surface potential of setting photoreceptor be-occasion about 650V, the development that is applied to developer roll 3 is biased in-and better about 350V.For carbon dust is applied to for powder roller 4 from the voltage that produces necessary polarity and electric field for powder roller 4 moves to developer roll 3 statically, apply usually-400V is to-700V, as apply-650V voltage.
As used above is required following characteristic for powder roller 4: the electric charge of carbon dust is not leaked.2. for to make carbon dust not have the electric charge of opposite polarity, be necessary to pay close attention to the frictional electrification sequence and select material.3. be charging degree not for the powder roller, appropriate electric conductivity is necessary.4. contact the occasion of developer roll for the powder roller, at mesh regional, push carbon dust forcibly to developer roll 3 for the powder roller, for not being with unwanted frictional electrification for carbon dust, having necessity of the hardness of managing electric conductivity spongy layer etc. accurately, frothing percentage, engagement width etc.5. for powder roller sliding contact developer roll surface, scrape off surface in contact carbon dust, make in the mode of renewal, though for the state on powder roller surface at electricity or mechanically all there is common maintenance to stablize constant necessity.6. to not have and can bring the electrical characteristics of influence the bias voltage that is applied to developer roll 3.About electrical impedance, equate with the impedance of developer roll 3 or higher better than it.7. can not bring necessary mechanical pressure to carbon dust.8. adopt and can not bring the material of injury developer roll.
As shown in Figure 5, existing covering electric conductivity spongy layer 11 is carried carbon dust to lip-deep donor rollers 4 by the concaveconvex shape on surface, because it has electric conductivity, by being applied to voltage and the voltage that is applied to developer roll 3 for powder roller 4, make at developer roll 3 with between for powder roller 4 and produce electric field, the function that makes carbon dust be adsorbed onto developer roll 3 statically expeditiously is essential.But can produce following problem on for the electric conductivity spongy layer 11 on powder roller 4 surfaces: the frothing percentage that 1. will manage the electric conductivity spongy layer is very difficult, and frothing percentage changes, and hardness, resistance value, surface groove number also change easily.Guarantee the characteristic of this regulation, need to produce the less sponge of variation, but this is difficult.2. because the electric conductivity sponge self easily is out of shape, when making, form profile for just justifying and being very difficult at setting.As, the form accuracy of sponge be ± 0.2mm about.Diameter of phi as developer roll is 20mm, for powder roller diameter Φ is 16mm, under this precision, when the amount of being absorbed in of sponge is 0.5mm ± 0.2mm, the engagement width is the degree of 3mm to 5mm, and its variation meeting brings big influence to the frictional electrification with the contact impedance of developer roll 3 and carbon dust.Also have,, therefore cause manufacturing cost to rise owing to be necessary to carry out such processing.3. be the electric conductivity spongy layer to be installed form around metal tube core 10 as sponge roller, fix with the sticker of electric conductivity between tube core 10 and the electric conductivity spongy layer 11 for powder roller 4.It is difficult adhering between tube core 10 and the electric conductivity spongy layer 11 equably, and part of being adhered and the electrical specification of part on the surface of not adhered have significant difference.4. fixed toner 17 rises electrical impedance to the recess 18 on the surface of electric conductivity spongy layer 11, hinders the transport capacity of carbon dust 17 significantly, and increases driving torque.Therefore, comparatively shortened the serviceable life that supplies powder roller 4.5. also have, for developer roll 3, the pushing force increase for powder roller surface can apply unwanted pressure to carbon dust, brings the consequence of the marked change of carbon dust shape or surface state, can not keep stable image.6. the pushing force for the surface of powder roller 4 increases, unwanted frictional electrification and be easy to generate at the film of developer roll.
These phenomenons are being developed on the image of formation, show as following problem: 1. because the density unevenness that the supply instability of carbon dust causes is even.2. because the concentration change that the carbon dust characteristic variations causes and the rising of Fog density.
Also have, bring significant variation at the quantity of electric charge for 11 pairs of carbon dusts of electric conductivity spongy layer of powder roller 4, produce the occasion with the carbon dust of the opposite polarity polarity of regulation, unwanted carbon dust adheres in the non-image portion on photoreceptor 2.Owing to be and the carbon dust of specified polarity opposite polarity, in the static printing mode, the repulsive force owing to static almost can not be transferred on the recording chart attached to the carbon dust on this photoreceptor 2.But, after reclaiming carbon dust residual on the photoreceptor 2 from photoreceptor 2 with cleaning equipment, turn back in the developing apparatus regeneration (recycle) that utilizes again or in development phase, carry out the cleaning of residual carbon dust simultaneously, be in the so-called no cleaning member mode, the concentration (ratio) of the opposite charged carbon dust in the developing apparatus increases along with increasing of printing, brings obstacle to image quality.
Also have, these carbon dusts are in contact charging modes such as charging roller or charging brush, and it is easy that carbon dust adheres to statically, and charging equipment is polluted by these carbon dusts, can not normally charge, and cause charging inhomogeneous easily.Particularly in no cleaning member mode, it is difficult reclaiming carbon dust with developer roll 3 under static, becomes carbon dust and still is attached to state on the photoreceptor 2, and damaged image quality.
Also have, as for powder roller 4, in the occasion of using metal roller, since significantly low for the resistance value of powder roller 4, under noncontact, be used.Thus, the problems referred to above that produce because of contact can not take place, and still, in the occasion of metal roller, the surface is roughly level and smooth, and the conveying of carbon dust is relatively poor, and it is even to be easy to generate density unevenness.Also have, because noncontact, the electric field intensity that keep being formed between developer roll 3 and the donor rollers 4 is certain, just must manage the gap between developer roll 3 and the donor rollers 4 accurately.Also have, because noncontact, make through development phase and the carbon dust that comes is peeled off, supply with being known as (reset) effect that resets and looking to fully of carbon dust,, damaged image quality so produce ghost image etc. from developer roll 3.
The utility model content
First purpose of the present utility model provides a kind of can addressing the above problem, and just can increase the service life and make the carried charge stabilization of developer with cheap price, and developer that can the inhibition zone opposite charges generate for the powder roller.
Second purpose of the present utility model provides a kind of developing apparatus that has above-mentioned for the powder roller.
For realizing above-mentioned first purpose, it is a kind of for the powder roller that the utility model provides, and this confession powder roller is implanted on the surface of its core pipe plurality of fibers.This supplies with developer to developer roll for powder roller, and developer roll resupplies the electrostatic latent image of developer to the photoreceptor, makes the electrostatic latent image video pictureization.
According to the utility model, posture with expectation, just relatively radially to become 0 angle of spending in the 90 degree scopes that the fiber that extends is implanted to surface for the powder roller, keep developer in the gap between fiber, developer roll and contacting or adjacent domain for powder roller fiber, developer directly is expressed to developer roll surface and can sliding contact, can not bring unwanted frictional electrification to developer, perhaps changes the carried charge that developer has.Also have, can not produce mechanical pressure developer.And owing to the rotation along with developer roll, fiber vibration, developer are fixed to the surface for the powder roller, do not worry reduction of service life, reach the purpose that has than the long life.With the occasion of removing the renewal of the developer on the developer roll for the powder roller, compare with wiping under the surface contact state with the electric conductivity spongy layer with existing, owing to flying developer by bullet, the toughness with fiber removes, so can not apply unwanted pressure developer.Also have,, can reduce driving torque owing to developer roll with for almost producing the friction impedance between the powder roller.
Also have the utility model to have electric conductivity or semiconduction surface for the core pipe of powder roller, fiber also has electric conductivity or semiconduction surface, can between for powder roller and developer roll, can form stable electric field like this, and prevent charging, can keep for the electrical characteristics of powder roller and stablize, can make from supplying the developer transfer amount stabilization of powder roller to developer roll.There is following several situation on the surface of core pipe and fiber: (a) surface of core pipe and fiber all has electric conductivity; (b) surface of electric conductivity and fiber is arranged is semiconduction on the surface of core pipe; (c) surface of semiconduction and fiber is arranged is electric conductivity on the surface of core pipe; (d) surface of core pipe and fiber all has semiconduction.So-called electric conductivity be meant a end at whole fibers of being implanted for the powder roller to the resistance between the other end of whole fibers 10
6Ω is to less than 10
9The scope of Ω, so-called semiconduction is meant 10
9Ω to 10
12Ω.
Also have, the top ends surface of the fiber of the utility model confession powder roller has electrical insulating property, even the top ends of fiber contact developer roll can not become "on" position between developer roll and the confession powder roller yet, can stably keep surface potential separately.
In the utility model, fiber contains the electric conductive polymer layer on electrical insulating property or semiconduction base material and covering substrates surface, can be easier and qurer manufacture and make integral body have electric conductivity.Described electric conductive polymer is the electronic conductivity material.Use polypyrrole class electric conductive polymer as electrically conductive material, can easily give electric conductivity the base material of a plurality of kinds.
For realizing above-mentioned second purpose, the utility model provides a kind of developing apparatus, uses in the image processing system of electrofax mode, is used to supply with developer to the photoreceptor that forms electrostatic latent image, makes the electrostatic latent image video pictureization.This developing apparatus comprises: the container of storage of developer; Supply with the developer roll of developer to the photoreceptor; Developer in the supply container to the developer roll for the powder roller, this confession powder roller has plurality of fibers in the implantation of the surface of its core pipe.According to the utility model, the developer that is transferred between the fiber of the core tube-surface that supplies the powder roller is successfully transferred to developer roll, thereby carries out stable development.
Description of drawings
Fig. 1 is the sectional view that roughly constitutes of example one of the present utility model.
Fig. 2 is the enlarged drawing of the contact site of the developer roll 23 of Fig. 1 and donor rollers 24.
Fig. 3 (a) is the organigram of the fiber 32 among Fig. 2; Fig. 3 (b) is whole organigram with fiber 32 ' of electric conductivity.
Fig. 4 plants the synoptic diagram of planting mao portion 31 that mao method forms Fig. 1 by static.
Fig. 5 is existing simplification sectional view for powder roller 4 and developing apparatus 1.
Fig. 6 is the manufacture method synoptic diagram for powder roller 4 of Fig. 5.
Fig. 7 is the developer roll 3 of Fig. 5 and the rough cross-sectional view that supplies the contact site between the powder roller 4.
Fig. 8 is the developer roll 3 of Fig. 5 and the illustraton of model that supplies the status of electrically connecting between the powder roller 4.
Embodiment
Fig. 1 illustrates the roughly formation of example one of the present utility model.Developing apparatus 21 comprised developer reservoir 27, developer roll 23, for powder roller 24 with as the scraper 25 of developer control assembly.Developer roll 23 and have electric conductivity for powder roller 24, from grid bias power supply 28,29 apply respectively-350V and-bias voltage of 650V.The formation of the developer roll 3 of the formation of developer roll 23 and prior art shown in Figure 5 is basic identical.For powder roller 24 is to form mao portion 31 of planting around core pipe 30.
The edge of scraper 25 by with developer roll 23 surfaces near and leave the developer adhesion amount of controlling on the developer roll 23, the scraper 5 shown in also can image pattern 5 is such, adopts the form of top ends contact.
Fig. 2 illustrates the state for powder roller 24 and developer roll 23 contacted engaging pieces for Fig. 1.Planting mao portion 31, implanting with certain density toward the fiber 32 that radially extends of developer roll 23.Developer 37 is maintained in the gap between each fiber 32.Surface at fiber 32 forms electric conductive polymer layer 33, and it covers the electrical insulating property base material 34 at center.Top ends at fiber 32, aforementioned electric conductive polymer layer 33 is removed, fiber 32 directly contacts the surface of developer roll 23 by its electrical insulating property base material 34, owing to can not be in "on" position, so the bias voltage of developer roll 23 and confession powder roller 24 is kept with being stabilized.Fiber 32 is owing to there is to a certain degree toughness, if residual on developer roll 23 have a developer, can not exert pressure, and can fall to remove by bullet.
Fig. 3 (a) illustrates the fiber 32 of present embodiment, and Fig. 3 (b) illustrates the fiber 32 ' that integral body has electric conductivity.Have in the fiber 32 ' of electric conductivity in the integral body shown in Fig. 3 (b), conductive layer such as carbon-point layer 35 are present in the interlayer of electrical insulating property material, form base material self.The electric conductivity that forms such a carbon-point layer 35 grade is partly for base material is difficult on making certainly, and manufacturing cost can rise.The electric conductive polymer layer 33 of this example that Fig. 3 (a) illustrates is better as the commodity that can use Achilles joint-stock company polypyrrole class electric conductive polymers such as " ST Port リ " by name.In polypyrrole class electric conductive polymer, think the dication etc. of the main polymer chain shape that generated by between main chain, moving, the carrying electric charge illustrates electric conductivity.Therefore the thickness of the laminar surface of such a polypyrrole can not eliminate properties of materials at 0.1 μ m to 0.5 μ m, can give electric conductivity.Electric conductivity in aforesaid electrical impedance 10
2Ω to 10
7The scope of Ω is freely set.Because the mechanism that gives electric conductivity is the electronic conductivity by dication, in the occasion humidity of ionic conductivity electric conductivity is changed, can stably keep electric conductivity.
As electrical insulating property base material 34, the fiber that can use electrical insulating property synthetic resin such as acrylic resin, polyester, nylon to make.In order to improve the stickability of electric conductive polymer layer 33 and base material 34, as required, also can anticipate.Base material 34 is about 3 daniers, and length 1.0 is to 3.0mm, better is 1.2 to 1.5mm, thus, the surface energy of core pipe 30 more thickly static plant hair, long can the reduction be planted gross density.Also have top ends, remove electric conductive polymer layer 33 and form electric insulation part 36 at fiber 32.
Fig. 4 schematically illustrates on the surface for powder roller 24 of Fig. 1 and plants the operation that mao portion 31 is planted in mao method formation by static.Around core pipe 30, be coated with the adhering agent layer 39 of electric conductivity or semiconduction, between the pair of parallel plate electrode 41,42 separated by a distance up and down of Fig. 4, apply high voltage by direct supply 38.The horizontal axis 43 of core pipe 30 is parallel to the electrode 41,42 of level.In this electric field, produce the electric field line that is parallel to the imaginary perpendicular 45 that contains axis 43.On the electrode 41 of the hot side of power supply 38, be loaded with the plurality of fibers 32 of predefined same length.Between core pipe 30 and electrode 41, be provided with the flat control assembly 48 that constitutes by electrical insulating property materials such as synthetic resin.Form joint-cutting 44 at control assembly 48, joint-cutting 44 is parallel to the axis 43 of core pipe 30 and extends.The imaginary plane 45 that contains axis 43 is under the state of Fig. 4 of the axis 46 that contains joint-cutting 44, and the elongated fibers 32 that flies up along electric field line is attached to core pipe 30 radially by adhering agent layer 39.
In other example of the present utility model, the joint-cutting 44 that control assembly 43 can also be set is indexed to its left or right-hand from the imaginary plane 45 of Fig. 4.Thus, fiber 32 is attached to the surface of core pipe 30 with the posture of relative core pipe 30 radial skews.
When static is planted mao, core pipe 30 is along the sensing of arrow 47 rotation, and therefore, the fiber 32 by joint-cutting 44 at core pipe 30 radially, perhaps with respect to this radially with desired angle at the state attachment fiber 32 that tilts, can plant hair in the whole peripheral surface of core pipe 30 like this.The axis 46 of joint-cutting 44 is in aforesaid imaginary plane 45, and it is shown in Figure 4 to be parallel to the state of axis 43 of core pipe 30.The polarity of direct supply 38 is opposite with Fig. 4's, fiber 32 is set also is fine to the electrode of low potential side.
In the top ends of fiber 32, in order to form the electric insulation part 36 shown in Fig. 3 (a), after aforementioned adhesion, in case mechanically remove formed electric conductive polymer layer 33, or remove formed electric conductive polymer layer 33 by organic solvent etc. and can form.
In other example of the present utility model, between photoreceptor and developer roll, can be provided with the space of regulation, by the surface electrical potential difference of photoreceptor, make developer skip this space, promptly so-called great-jump-forward visualization way.As previously discussed, the utility model also can use in supplying with the visualization way of nonmagnetic single component carbon dust to the developer roll preferably, and in addition, developer can also be the two-component developing agent that is made of carrier and carbon dust.
Claims (10)
1. one kind supplies the powder roller, comprises the core pipe, it is characterized in that: implant on the surface of described core pipe plurality of fibers.
2. according to claim 1 for the powder roller, it is characterized in that: described core pipe has electric conductivity or semiconduction surface.
3. according to claim 2 for the powder roller, it is characterized in that: described fiber has electric conductivity or semiconduction surface.
4. according to claim 3 for the powder roller, it is characterized in that: the top ends of described fiber has the electrical insulating property surface.
5. according to claim 3 for the powder roller, it is characterized in that: described fiber contains electrical insulating property or semiconduction base material and covers the electric conductive polymer layer of this substrate surface.
6. developing apparatus comprises:
The container of storage of developer;
Supply with the developer roll of developer to the photoreceptor;
Supply with the confession powder roller of developer to described developer roll, this confession powder roller has the core pipe;
It is characterized in that:
Described core tube-surface for the powder roller is implanted plurality of fibers.
7. developing apparatus according to claim 6 is characterized in that: described core pipe has electric conductivity or semiconduction surface.
8. developing apparatus according to claim 7 is characterized in that: described fiber has electric conductivity or semiconduction surface.
9. developing apparatus according to claim 8 is characterized in that: the top ends of described fiber has the electrical insulating property surface.
10. developing apparatus according to claim 8 is characterized in that: described fiber contains electrical insulating property or semiconduction base material and covers the electric conductive polymer layer of this substrate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920050840U CN201373979Y (en) | 2009-01-20 | 2009-01-20 | Powder supply roller and developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920050840U CN201373979Y (en) | 2009-01-20 | 2009-01-20 | Powder supply roller and developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201373979Y true CN201373979Y (en) | 2009-12-30 |
Family
ID=41500062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920050840U Expired - Fee Related CN201373979Y (en) | 2009-01-20 | 2009-01-20 | Powder supply roller and developing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201373979Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103946752A (en) * | 2011-11-29 | 2014-07-23 | 佳能株式会社 | Developing device, cartridge and electrophotographic image forming apparatus |
-
2009
- 2009-01-20 CN CN200920050840U patent/CN201373979Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103946752A (en) * | 2011-11-29 | 2014-07-23 | 佳能株式会社 | Developing device, cartridge and electrophotographic image forming apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20140120 |