CN101984374A - Carbon powder box and powder discharging knife thereof - Google Patents
Carbon powder box and powder discharging knife thereof Download PDFInfo
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- CN101984374A CN101984374A CN 201010535435 CN201010535435A CN101984374A CN 101984374 A CN101984374 A CN 101984374A CN 201010535435 CN201010535435 CN 201010535435 CN 201010535435 A CN201010535435 A CN 201010535435A CN 101984374 A CN101984374 A CN 101984374A
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Abstract
The invention provides a carbon powder box and a powder discharging knife thereof. The carbon powder box comprises a box frame, a developing roller and the powder discharging knife, wherein the developing roller is rotatably supported on the box frame; the powder discharging knife is fixed on the box frame; the blade of the powder discharging knife comprises an upstream blade positioned at the upstream part of the rotation direction of the developing roller and a downstream blade positioned at the downstream part of the rotation direction of the developing roller; the upstream blade and the downstream blade are made of materials with different elasticity; the lower part of the upstream blade and the surface of the developing roller form an upstream meshing point; and the lower part of the downstream blade and the surface of the developing roller form a downstream meshing point. The invention can improve the surface wear states of the powder discharging knife and the developing roller so that the charged quantity of the carbon powder is more sufficient and uniform and can be controlled more easily, and the yield of the carbon powder can be controlled more accurately, thereby improving the stability of the printing quality.
Description
Technical field
The present invention relates to the technique of laser imaging field, relate in particular to and a kind ofly be applied to the cartridge of imaging devices such as laser printer and be installed in powder delivery cutter in the cartridge.
Background technology
Laser printer is one of present most widely used computing machine output peripheral equipment, and it utilizes the physics, the principles of chemistry of light, electricity, heat by interaction output character or image.Basic process can be divided into seven steps such as charging, exposure, development, transfer printing, photographic fixing, the electricity that cleans, disappears.At first, photosensitive drum surface is charged equably by charging roller.Laser scanner is launched the laser through ovennodulation that contains image information to photosensitive drums, forms and the electrostatic latent image for the treatment of that duplicating image is corresponding at photosensitive drum surface.Then, from the carbon dust of developer roll then be adsorbed on and make electrostatic latent image convert visual image on the photosensitive drum surface.Along with the rotation of photosensitive drums and the positive voltage effect that the recording medium back sides such as paper is applied through transfer roll, the electronegative carbon dust that has formed visual image at photosensitive drum surface is produced attractive force, visual image promptly is transferred on the recording medium such as paper.With after after warm-up mill and backer roll carry out heating and pressurizing to the visual image on the recording medium, the visual image full solidification that carbon dust is formed is on recording medium.So basic imaging action has just been finished.
In above-mentioned print procedure, convert the electrostatic latent image on the photosensitive drums to visual image, must depend on the adsorbed carbon dust of developer roll.These carbon dusts are stored in the toner, and by the transport supply of powder feeding roller realization to developer roll.Developer roll is adsorbed on its surface by Electrostatic Absorption effectiveness with carbon dust, and when when keeping the powder delivery cutter of Elastic Contact with developer roll, the carbon dust on developer roll surface is wipeed off equably to suitable thickness.A may command carbon dust of nipping that forms between powder delivery cutter and developer roll is transferred to the carbon dust amount on the photosensitive drum surface.Importantly, the powder delivery cutter should form contact uniformly on the whole length of developer roll.If during transfer, the powder delivery cutter then makes uneven carbon dust amount transfer on the photosensitive drums with inconsistent pressure contact developer roll, causes inconsistent unacceptable image quality.
A kind of typical structure of cartridge is as described in the U.S. Pat 6496669, wherein the two ends of developer roll are fixed on two sidewalls of developing chamber, the powder delivery cutter is placed on a side of developer roll, the powder delivery cutter comprises and the blade of formation biting point, developer roll surface and the knife rest that fixed blade is used, in the cartridge course of work, the puddle support that is distributed in the powder storehouse is transported to carbon dust in the developing chamber, again carbon dust is sent to the developer roll surface that is in contact with it by powder feeding roller, cover the biting point of the carbon dust part on developer roll surface by developer roll and the formation of powder delivery cutter, form the carbon dust amount of transferring to uniformly on the photosensitive drum surface on the developer roll surface, wherein biting point place powder delivery cutter the direct influence of power that the developer roll surface is applied is to the thickness of carbon powder on photosensitive drum surface amount, the carbon dust by the biting point does not accumulate in the merge point place, along with gathering increasing of carbon dust, under the effect of gravity, drop in the developing chamber.Generally, be generally about 3 times of carbon dust particle diameter attached to the developer roll surface carbon dust layer thickness that is delivered to photosensitive drum surface to be passed by the biting point, cartridge uses the initial stage, because of carbon dust amount in the powder storehouse more, the carbon dust that the place, biting point gathers is more, be the carbon dust layer thickness of control by the place, biting point, the powder delivery cutter applies bigger pressure to the developer roll surface at the place, biting point, minimizing along with carbon dust amount in the cartridge, the powder delivery cutter applies bigger pressure to developer roll surface at biting point place will cause carbon dust layer thickness attenuate by the place, biting point, thereby causes transferring to the reduction of the carbon dust amount of photosensitive drum surface; In addition, the powder delivery cutter applies bigger pressure to the developer roll surface at the place, biting point, will cause the wearing and tearing fast of powder delivery cutter and developer roll surface, causes the change of the physical state at place, biting point, has reduced the stability of print quality.In the powder box of high capacity high life used, above-mentioned bad phenomenon was more remarkable.
Summary of the invention
First purpose of the present invention is the defective at prior art, provide a kind of and can improve powder delivery cutter and developer roll surface abrasion status, the carried charge that makes carbon dust more fully, more even and be easier to control, control to the carbon dust powder outlet quantity is more accurate, thereby improves the cartridge of print quality stability.
Second purpose of the present invention is to provide a kind of powder delivery cutter that is used for above-mentioned cartridge.
For realizing above-mentioned first purpose, the present invention has adopted following technical scheme: design a kind of cartridge, comprise box framework, developer roll and powder delivery cutter, described developer roll rotatably is supported in described box framework, described powder delivery cutter is fixed in described box framework, this powder delivery cutter has the blade that forms the biting point with described developer roll surface, described blade has comprised upstream blade that is positioned at described developer roll rotation direction upstream and the downstream blade that is positioned at described developer roll rotation direction downstream, and described upstream blade is the different material of elasticity with the downstream blade; The bottom of described upstream blade and described developer roll surface have formed the biting point, upstream, and the bottom of described downstream blade and described developer roll surface have formed the biting point, downstream.
The beneficial effect of technique scheme is: the upstream blade of use unlike material carries out secondary with downstream blade and developer roll and contacts, with the pressure distribution of powder delivery cutter on different biting points, increased contact area, of the wearing and tearing of powder delivery cutter have been reduced to the developer roll surface, simultaneously, blade by two unlike materials carries out secondary control to carbon dust, makes more accurate to the control of carbon dust powder outlet quantity; And through the secondary friction, the carried charge that makes carbon dust more fully, more even and be easier to control.In addition, because carbon dust is to be delivered to photosensitive drum surface through the biting point, downstream again by the biting point, upstream earlier, at this moment, the pressure at biting point, upstream place can suitably reduce, with the carbon dust of avoiding mobile difference accumulate in a large number the upstream, biting point cause carbon dust stick on the blade, make carbon dust can not in time get back to developing chamber or by the biting point, cause the change of carbon dust physical property herein and influence print quality.
In one embodiment, the elasticity of described upstream blade is greater than the elasticity of described downstream blade, and wherein, described upstream blade is the PU blade, and described downstream blade is a metal blade.
In another embodiment, the elasticity of described upstream blade is less than the elasticity of described downstream blade, and wherein, described upstream blade is a metal blade, and described downstream blade is the PU blade.
Preferably, described powder delivery cutter also comprises the knife rest that is fixed in described box framework, and the top of the top of described upstream blade and described downstream blade is separately fixed at the front surface and the rear surface of described knife rest, described upstream blade and blade space, downstream.Because two blades are isolated mutually, make the powder delivery cutter be decomposed into two parts to the pressure of developer roll, reduced the pressure of powder delivery cutter to developer roll, avoided the carbon dust of mobile difference to accumulate in a large number outside the biting point and cause carbon dust stick on the blade, make carbon dust can not in time get back to developing chamber or by the biting point, cause the change of carbon dust physical property herein and influence print quality.
Preferably, the biting pressure of biting point, described upstream is less than the biting pressure of biting point, described downstream.Can avoid the carbon dust of mobile difference to accumulate in a large number outside the biting point, upstream like this and cause carbon dust stick on the blade, make carbon dust can not in time get back to developing chamber or by the biting point, cause the change of carbon dust physical property herein and influence print quality.
For realizing above-mentioned second purpose, the present invention has adopted following technical scheme: a kind of powder delivery cutter that is applied to cartridge is provided, described powder delivery cutter has the blade that can form the biting point with the developer roll surface of described cartridge, described blade has comprised the upstream blade that is positioned at described developer roll rotation direction upstream when installing and has been positioned at the downstream blade in described developer roll rotation direction downstream when installing that described upstream blade is the different material of elasticity with the downstream blade; Described upstream blade has the upstream bite with the upstream face interlock of described developer roll, and described downstream blade has the downstream bite with the downstream surface interlock of described developer roll.
Description of drawings
Fig. 1 is the structural representation of the embodiment one of cartridge of the present invention.
Fig. 2 is the cut-open view of cartridge shown in Figure 1.
Fig. 3 is the enlarged drawing of the powder delivery cutter part among Fig. 2.
Fig. 4 is the powder delivery knife structure synoptic diagram of the embodiment two of cartridge of the present invention.
Embodiment
Referring to Fig. 1 and Fig. 2, the embodiment one of cartridge of the present invention has comprised box framework 1, developer roll 2, powder delivery cutter 3 and powder feeding roller 4 etc., carbon dust is contained in the powder storehouse 5 of box framework 1, developer roll 2 and powder delivery cutter 3 are positioned at the developing chamber 6 of box framework 1, and rotatably are supported between two end walls of box framework 1.Wherein, as shown in Figure 3, powder delivery cutter 3 is made up of knife rest 31, metal blade 32 and PU blade 33, and metal blade 32 is positioned at the rotation direction upstream of developer roll 2, and PU blade 33 is positioned at the rotation direction downstream of developer roll 2.Knife rest 31 is fixed on the box framework 1 by screw 34, and the top 321 of metal blade 32 is fixed on the front surface 311 of knife rest 31, and the top 331 of PU blade 33 is fixed on the rear surface 312 of knife rest 31, and metal blade 32 and PU blade 33 spaces do not contact mutually.
The lower end of described metal blade 32 has upstream bite 322, and metal blade 32 has formed the biting point, upstream by the upstream face of this upstream bite 322 and developer roll 2; The lower end of described PU blade 33 has downstream bite 332, and PU blade 33 has formed the biting point, downstream by the downstream surface of this downstream bite 332 and developer roll 2.In the present embodiment, because metal blade 32 elasticity of upstream are less relatively, relative less with the area of developer roll 2 contacts, the biting pressure of biting point, upstream is bigger, and the carbon dust carried charge is abundant relatively inadequately; PU blade 33 elasticity in downstream are relatively large, and relatively large with the area that developer roll 2 contacts, the biting pressure of biting point, downstream is less, make the carbon dust carried charge more abundant relatively.Use metal blade 32 to carry out secondary with developer roll 2 and contact, carbon dust is carried out secondary control, make that the powder outlet quantity of carbon dust is more even with PU blade 33; And, make the carried charge of carbon dust more fully more even through the secondary friction.This kind structure is applicable to the carbon dust with relatively poor triboelectric behavior.
Referring to Fig. 4, powder delivery knife structure and the embodiment one of the embodiment two of cartridge of the present invention are similar, and this powder delivery cutter has comprised upstream blade and downstream blade equally, and different with embodiment one is, upstream blade in the middle of the embodiment two is a PU blade 33, and the downstream blade is a metal blade 32.Because PU blade 33 elasticity of upstream are relatively large, relatively large with the area that developer roll 2 contacts, make the carbon dust carried charge more abundant relatively, less because of place, biting point, upstream pressure simultaneously, be difficult for producing and melt caking herein owing to heat of friction causes carbon dust, the carbon dust of big particle diameter is blocked on external developing roller 2 surface aggregations in biting point in addition, under the factor affecting of the rotation of developing roller 2 and gravity, drops to developing chamber 6 again; And metal blade 32 elasticity in downstream are less relatively, relative less with the area of developer roll contact, the biting pressure of biting point, downstream is bigger, can control the powder outlet quantity of carbon dust more accurately, place, biting point, downstream is thinner because of the carbon dust layer, thereby carbon dust can not melt caking herein.Present embodiment uses PU blade 33 to carry out secondary with developer roll 2 respectively with metal blade 32 and contacts, and carbon dust is carried out secondary control, makes that the powder outlet quantity control of carbon dust is more accurate; And through the secondary friction, make the carried charge of carbon dust more abundant, more even and be easier to control.This kind structure is applicable to because of environment or other factors and causes carbon dust that contains more loose conglomeration structure or the carbon dust with preferable triboelectric behavior.
Above-described only is preferred implementation of the present invention, should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (10)
1. cartridge, comprise box framework, developer roll and powder delivery cutter, described developer roll rotatably is supported in described box framework, described powder delivery cutter is fixed in described box framework, this powder delivery cutter has the blade that forms the biting point with described developer roll surface, it is characterized in that: described blade has comprised upstream blade that is positioned at described developer roll rotation direction upstream and the downstream blade that is positioned at described developer roll rotation direction downstream, and described upstream blade is the different material of elasticity with the downstream blade; The bottom of described upstream blade and described developer roll surface have formed the biting point, upstream, and the bottom of described downstream blade and described developer roll surface have formed the biting point, downstream.
2. cartridge according to claim 1 is characterized in that: the elasticity of described upstream blade is greater than the elasticity of described downstream blade, and wherein, described upstream blade is the PU blade, and described downstream blade is a metal blade.
3. cartridge according to claim 1 is characterized in that: the elasticity of described upstream blade is less than the elasticity of described downstream blade, and wherein, described upstream blade is a metal blade, and described downstream blade is the PU blade.
4. according to each described cartridge of claim 1 to 3, it is characterized in that: described powder delivery cutter also comprises the knife rest that is fixed in described box framework, the top of the top of described upstream blade and described downstream blade is separately fixed at the front surface and the rear surface of described knife rest, described upstream blade and blade space, downstream.
5. according to each described cartridge of claim 1 to 3, it is characterized in that: the biting pressure of biting point, described upstream is less than the biting pressure of biting point, described downstream.
6. one kind is used for the powder delivery cutter of cartridge according to claim 1, described powder delivery cutter has the blade that can form the biting point with the developer roll surface of described cartridge, it is characterized in that: described blade has comprised the upstream blade that is positioned at described developer roll rotation direction upstream when installing and has been positioned at the downstream blade in described developer roll rotation direction downstream when installing that described upstream blade is the different material of elasticity with the downstream blade; Described upstream blade has the upstream bite with the upstream face interlock of described developer roll, and described downstream blade has the downstream bite with the downstream surface interlock of described developer roll.
7. powder delivery cutter according to claim 6 is characterized in that: the elasticity of described upstream blade is greater than the elasticity of described downstream blade, and wherein, described upstream blade is the PU blade, and described downstream blade is a metal blade.
8. powder delivery cutter according to claim 6 is characterized in that: the elasticity of described upstream blade is less than the elasticity of described downstream blade, and wherein, described upstream blade is a metal blade, and described downstream blade is the PU blade.
9. according to each described powder delivery cutter of claim 6 to 8, it is characterized in that: described powder delivery cutter also comprises the knife rest that is fixed in described box framework, the top of the top of described upstream blade and described downstream blade is separately fixed at the front surface and the rear surface of described knife rest, described upstream blade and blade space, downstream.
10. according to each described powder delivery cutter of claim 6 to 8, it is characterized in that: the biting pressure of biting point, described upstream is less than the biting pressure of biting point, described downstream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010535435 CN101984374A (en) | 2010-11-08 | 2010-11-08 | Carbon powder box and powder discharging knife thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010535435 CN101984374A (en) | 2010-11-08 | 2010-11-08 | Carbon powder box and powder discharging knife thereof |
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| Publication Number | Publication Date |
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| CN101984374A true CN101984374A (en) | 2011-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010535435 Pending CN101984374A (en) | 2010-11-08 | 2010-11-08 | Carbon powder box and powder discharging knife thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000019840A (en) * | 1998-07-03 | 2000-01-21 | Fuji Xerox Co Ltd | Developing device, unit provided with developing mechanism and image forming device |
| JP2001228705A (en) * | 2000-02-17 | 2001-08-24 | Ricoh Co Ltd | Developing device |
| JP2004093700A (en) * | 2002-08-29 | 2004-03-25 | Ricoh Co Ltd | Image forming apparatus |
| JP2006243620A (en) * | 2005-03-07 | 2006-09-14 | Ricoh Co Ltd | Cleaning device, process cartridge, and image forming apparatus |
| CN201177734Y (en) * | 2008-03-26 | 2009-01-07 | 珠海天威技术开发有限公司 | Powder supply knife and powder box |
| CN201444236U (en) * | 2009-07-24 | 2010-04-28 | 富美科技有限公司 | Cleaning scraping knife |
| CN201859306U (en) * | 2010-11-08 | 2011-06-08 | 珠海天威飞马打印耗材有限公司 | Toner cartridge and toner discharge scraper thereof |
-
2010
- 2010-11-08 CN CN 201010535435 patent/CN101984374A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000019840A (en) * | 1998-07-03 | 2000-01-21 | Fuji Xerox Co Ltd | Developing device, unit provided with developing mechanism and image forming device |
| JP2001228705A (en) * | 2000-02-17 | 2001-08-24 | Ricoh Co Ltd | Developing device |
| JP2004093700A (en) * | 2002-08-29 | 2004-03-25 | Ricoh Co Ltd | Image forming apparatus |
| JP2006243620A (en) * | 2005-03-07 | 2006-09-14 | Ricoh Co Ltd | Cleaning device, process cartridge, and image forming apparatus |
| CN201177734Y (en) * | 2008-03-26 | 2009-01-07 | 珠海天威技术开发有限公司 | Powder supply knife and powder box |
| CN201444236U (en) * | 2009-07-24 | 2010-04-28 | 富美科技有限公司 | Cleaning scraping knife |
| CN201859306U (en) * | 2010-11-08 | 2011-06-08 | 珠海天威飞马打印耗材有限公司 | Toner cartridge and toner discharge scraper thereof |
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Application publication date: 20110309 |