CN104020652A - Developing unit, processing unit, and image forming device - Google Patents
Developing unit, processing unit, and image forming device Download PDFInfo
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- CN104020652A CN104020652A CN201410057209.1A CN201410057209A CN104020652A CN 104020652 A CN104020652 A CN 104020652A CN 201410057209 A CN201410057209 A CN 201410057209A CN 104020652 A CN104020652 A CN 104020652A
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Abstract
An objective of the invention is to provide a developing unit, a processing unit, and an image forming device which prevent film formation in an end side. The developing unit comprises a developing agnet carrying body (41) which carries a developing agnet on the surface, a developing agnet supply component (42) which supplies the developing agnet to the developing agnet carrying body (41) after contact with the surface of the developing agnet carrying body (41), and end sealing (50) which contacts with the end side of the developing agnet carrying body (41). The developing agnet supply component (42) comprises a core material (42a) and an elastic layer (42c) which is adhered to the periphery of the core material (42a). The end of the elastic layer (42c) of the developing agnet supply component (42) contacts with the end sealing (50). A non-bonding area (E) which is not sticky relative to the core material (42a)is arranged in a specific range from the end where the elastic layer (42c) contacts with the end sealing (50).
Description
Technical field
The present invention relates to developing apparatus, and the processing unit and the image processing system that comprise this developing apparatus.
Background technology
In the image processing system of the electronic photo mode of duplicating machine, printer, facsimile recorder or their compounding machine etc., be provided with and will be formed on the developing apparatus that sub-image on the photoreceptor as bearing member can video.
As illustrated in fig. 11, the basic constituent element of developing apparatus is the developer roll 410 loading from the teeth outwards as the toner of developer, with the donor rollers 420 toner being supplied on this developer roll 410, and the toner on developer roll 410 is restricted to limiting scraper 430 in uniform thickness etc.
It shown in Figure 12, is the A-A sectional drawing of Figure 11.As illustrated in fig. 12, donor rollers 420 generally comprises core 420a and by means of tack coat 420b, is provided in the elastic layer 420c in the periphery of core 420a.Elastic layer 420c is formed by polyurathamc etc., and keeps the backward developer roll 410 of toner in developing apparatus to supply with by this elastic layer 420c.
The elemental motion of developing apparatus is, first, the toner being housed in developing apparatus is located at the contact site (clamping part) of donor rollers 420 and developer roll 410, and the sliding friction by two rollers comes to be fed on the surface of developer roll 410 after frictional electrification.Next, the lip-deep toner that is positioned in developer roll 410 is applied in electric charge when being limited in uniform thickness by limiting scraper 430.Then, in the developing regional between photoreceptor 200 and developer roll 410, the toner on developer roll 410 is transferred on the sub-image on photoreceptor 200 by development electric field, and this sub-image just obtains visual as toner image.So, from donor rollers 420 to developer roll 410, or from developer roll 410 to photoreceptor 200, by carrying out well the handing-over of toner, obtain required image.
On the other hand, do not transfer on photoreceptor 200 and remain in toner on developer roll 410 when inner to the contact site (clamping part) of donor rollers 420 and developer roll 410 by conveyance again, can after scraping, be recycled by donor rollers 420.
In addition, as illustrated in fig. 12, in developing apparatus, in the position at the direction of principal axis both ends of developer roll 410, be provided with the end part seal 500 for Leakage prevention.This end part seal 500, by carrying out leakproof between the box body of developer roll 410 and developing apparatus (developer container) 400, suppresses the toner leakage occurring from the end of developer roll 410.
Here, if be careful the configuration of end part seal 500 and donor rollers 420, can know, donor rollers 420 is by means of gap S, to come to be set as mutually non-touching on direction of principal axis with respect to end part seal 500.So, by donor rollers 420 is set as noncontact with respect to end part seal 500, the end of donor rollers 420 (elastic layer 420c) just can not produce friction because touching on end part seal 500, thereby just can prevent rising or the heating (as described in patent documentation 1) of the rotary torque that causes because of friction.
But, as illustrated in fig. 12, by donor rollers 420 with respect to end part seal 500 when setting by means of gap S, in the end regions J on the developer roll 410 corresponding to this gap S, the composition that exists toner is attached to the problem of the film forming (fiiming) on developer roll membranaceously.This be because, in described end regions J, because donor rollers 420 is discontiguous with respect to developer roll 410, so just do not have the recovery function that reclaims the toner on developer roll 410 by donor rollers 420.That is to say, even if the toner in developing apparatus is attached in the end regions J on developer roll 410, because can not reclaim toner by donor rollers 420, accompanying toner sustainable existence on developer roll 410 after, finally can fixedly adhere into membranaceous rear generation film forming.
Then, when film forming is carried out, the band Electricity Functional of the toner of developer roll reduces, and toner is weakened the electrostatic adhesive force of developer roll, and toner has just easily moved to photoreceptor from developer roll.Consequently, meeting produces the bottom surface contamination phenomenon that toner adheres in the blank sheet of paper part (non-image forming portion) of the end side of paper using.
Especially, being shortened on direction of principal axis, realizes in the formation of miniaturization developer roll, because the end regions J of above-mentioned film forming may occur to diminish with the maximum difference by paper areas, as long as there is very little deflection (partially walking) in paper using, just easily in the end side generation bottom surface of paper using, pollute.
[patent documentation 1] (Japan) JP 2000-75654 communique
Summary of the invention
In view of the above problems, object is to provide a kind of developing apparatus that can prevent that at the end side place of developer carrier body film forming from occurring in the present invention, and comprises processing unit and the image processing system of this developing apparatus.
In order to solve above-mentioned problem, technical scheme of the present invention relates to a kind of developing apparatus, and it comprises developer carrier body, and it loads developer from the teeth outwards; Developer replenishing member, its with shown in after the Surface Contact of developer carrier body by developer replenishing to this developer carrier body; End part seal, it contacts with the end side of described developer carrier body, described developer replenishing member includes core and is bonded in the elastic layer on the outer peripheral face of this core, it is characterized in that, described developing apparatus contacts the end of the elastic layer of described developer replenishing member with described end part seal, and in the specialized range that described developer replenishing member starts in the end contacting with described end part seal from described elastic layer, being provided with respect to described core is inadherent non-bonded areas.
According to the present invention, by the end of developer replenishing member is contacted with end part seal, just can prevent the generation of the film forming in the end side of developer carrier body.
Further, according to the present invention, non-bonded areas is set in the specialized range that the end contacting with end part seal by the elastic layer from developer replenishing member starts, and the stress producing after just developer replenishing member can being contacted with end part seal disperses to the direction of principal axis of elastic layer.Consequently, can reduce the load causing because of friction between developer replenishing member and end part seal.
Accompanying drawing explanation
It shown in Fig. 1, is the summary pie graph of the related image processing system of an embodiment of the invention.
It shown in Fig. 2, is the sectional drawing of developing apparatus and toner cartridge.
It shown in Fig. 3, is the B-B sectional drawing of Fig. 2.
It shown in Fig. 4, is the sectional drawing of the direction of principal axis length of non-bonded areas.
Shown in Fig. 5, be the result figure of the test carried out for confirming effect of the present invention.
The sectional drawing of the developing apparatus that embodiments of the present invention shown in Fig. 6 are related.
It shown in Fig. 7, is the oblique view that is provided with the donor rollers of low friction member.
Shown in Fig. 8, be the figure of the donor rollers that is provided with low friction member seen from direction of principal axis.
It shown in Fig. 9, is the embodiment that is provided with the end exposure mechanism that the both ends side of photoreceptor is exposed.
It shown in Figure 10, is the pie graph of comparative example.
It shown in Figure 11, is the pie graph of developing apparatus in the past.
It shown in Figure 12, is the A-A sectional drawing of Figure 11.
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.In addition, in each drawing, for the inscape with the member of same function or shape or constituent part etc., as long as can differentiate, just by giving identical symbol and through once omitting its explanation again after explanation.
It shown in Fig. 1, is the summary pie graph as the printer of the related image processing system of a mode of enforcement of the present invention.First, all formations and the action of printer are described with reference to Fig. 1.
As shown in Figure 1, in image forming device body 100, can load and unload 4 processing unit 1Y, the 1M, 1C, the 1Bk that are provided with as image formation unit, form the image of the different colours such as yellow (Y) corresponding to the color decomposition composition of coloured image, magenta (M), cyan (C), black (Bk).Each processing unit 1Y, 1M, 1C, 1Bk include and load from the teeth outwards sub-image and as the photoreceptor 2 as the drum type of bearing member, with the surface of photoreceptor 2 is carried out charged and as the charged roller 3 of charged mechanism, carry out visual image with sub-image on photoreceptor 2 and as the developing apparatus 4 of developing mechanism, and for the surface of photoreceptor 2 is cleaned as the photoreceptor cleaning device 5 of cleaning mechanism.Also have, in Fig. 1, the photoreceptor 2 that the processing unit 1Y only yellow image being used has, charged roller 3, developing apparatus 4, cleaning device 5 etc. are given symbol, for other processing unit 1M, 1C, 1Bk, have omitted its symbol.
The top of developing apparatus 4, can load and unload toner cartridge 6Y, the 6M, 6C, the 6Bk that are provided with as developer feeding container throughout.In each toner cartridge 6Y, 6M, 6C, 6Bk, accommodated respectively the toner (developer) for the color of corresponding processing unit 1Y, 1M, 1C, 1Bk.
On the top of image forming device body 100, set the exposure device 7 that forms sub-image and form mechanism as sub-image on the surface of each photoreceptor 2.Exposure device 7 includes light source, polygonal mirror, f-θ lens, catoptron etc., and the surface irradiation to each photoreceptor 2 by laser according to view data.
In addition, below each photoreceptor 2, be equipped with transfer device 8.Transfer device 8 comprised intermediate transfer belt 9, tensioning that the band by the ring-type as transfer article forms set up the driven roller 10 of intermediate transfer belt 9 and driven voller 11, as 4 primary transfer rollers 12 of primary transfer mechanism, as the secondary transfer roller 13 of secondary transfer printing mechanism.Driven roller 10 rotates direction upper rotary by not shown drive source inhour in the drawings, and therefore makes intermediate transfer belt 9 shown in arrow, in direction, do around movement (revolution) in the drawings.
4 primary transfer rollers 12 contact with photoreceptor 2 by means of intermediate transfer belt 9 respectively.Thus, each photoreceptor 2 and intermediate transfer belt 9 are in contact with one another, and between has formed the primary transfer clamping for transfer printing toner image.In addition, in each primary transfer roller 12, be connected with not shown power supply, and on primary transfer roller 12, be applied with DC voltage (DC) and/or the alternating voltage (AC) of regulation.
Secondary transfer roller 13 contacts with driven roller 10 by means of intermediate transfer belt 9.Thus, just between secondary transfer roller 13 and intermediate transfer belt 9, formed the secondary transfer printing clamping for transfer printing toner image.In addition, in secondary transfer roller 13 also with primary transfer roller 12 similarly, be connected in not shown power supply, and in secondary transfer roller 13, be applied with DC voltage (DC) and/or the alternating voltage (AC) of regulation.
In addition, in the position on the right side of the figure of transfer device 8, be provided with the band cleaning device 14 that the surface of intermediate transfer belt 9 is cleaned.With cleaning device 14, include the cleaning balde 15 that contacts with the outer peripheral face of intermediate transfer belt 9, from the inner peripheral surface side of intermediate transfer belt 9, support the clean backing roll 16 of the tip of cleaning balde 15, the conveyance coil pipe 17 that the toner of removing from intermediate transfer belt 9 is carried out to conveyance.In addition, below transfer device 8, be also provided with used toner receptacle 18, and in the import department of used toner receptacle 18, be connected with the not shown used toner transfer tube from stretching out with cleaning device 14.
In addition, in the figure of transfer device 8, in the position in left side, be provided with toner mark sensor 19.Toner mark sensor 19 is optical sensors of reflection-type, and by toner mark sensor 19, detects after the adhesion amount or position of the toner on intermediate transfer belt 9, adjusts concentration or the position of toner image.
In the bottom of image forming device body 100, be provided with the sheet feed stacker 20 containing as the paper using P of recording medium, or from sheet feed stacker 20, carry out paper feed roller 21 of feed paper using P etc.Also have, recording medium, except common paper, also includes ground paper, postcard, envelope, thin paper, coating paper (coated paper or art paper etc.), tracing paper, OHP sheet material etc.
In addition, in image forming device body 100, be equipped with for paper using P is clamped to the conveyance path R discharging backward device by secondary transfer printing from sheet feed stacker 20.Between the position of paper feed roller 21 and the position of secondary transfer roller 13 in the R of this conveyance path, be equipped with as the right contraposition roller of roller on opportunity 22.On the other hand, in the R of conveyance path, than the position of secondary transfer roller 13, more lean in paper using conveyance direction downstream, set the fixing device 23 for the uncertain image being transferred on paper using P is carried out to photographic fixing.Further, in the terminal of conveyance path R, be provided with exit roller for paper using P is discharged outside device to 24, and be provided with at the upper face of image forming device body 100 the ADF dish 25 that is discharged to the paper using P outside device for stacking.
The action of described image processing system is as follows.After imaging action starts, the photoreceptor 2 of each processing unit 1Y, 1M, 1C, 1Bk is just driven by revolution clockwise rotating in direction of Fig. 1, and the surface that makes each photoreceptor 2 by charged roller 3 by uniform charged the polarity for stipulating.Then, the view data according to coming from not shown reading device or computing machine etc. by the exposure of exposure device 7, has just formed electrostatic latent image on charged of each photoreceptor 2.At this moment, on each photoreceptor 2, the view data of exposure is desirable full-color image to be resolved into the monochromatic view data after the color data such as yellow, magenta, cyan and black.In electrostatic latent image on being so formed on photoreceptor 2, by supplying with from each developing apparatus 4 the toner of coming, electrostatic latent image just (visual image) as being rasterized of toner image.
Then, after imaging action starts, the revolution of just setting up the driven roller 10 of intermediate transfer belt 9 by tensioning drives, and makes in intermediate transfer belt 9 direction of arrow in the drawings work around movement.Then, contrary and through the voltage that burning voltage or steady current have been controlled by apply charged polarity with toner on each primary transfer roller 12, in the primary transfer clamping between each primary transfer roller 12 and each photoreceptor 2, form transfer electric field.
Afterwards, revolution along with each photoreceptor 2, when the toner image of all kinds on photoreceptor 2 arrives primary transfer clamping, just, by being formed on the transfer electric field in above-mentioned primary transfer clamping, the toner image on each photoreceptor 2 is transferred on intermediate transfer belt 9 successively overlappingly.Thus, just on the surface of intermediate transfer belt 9, loaded the toner image of full color.In addition, the toner not being transferred to completely on each photoreceptor 2 on intermediate transfer belt 9 will be removed by band cleaning device 5.
In the bottom of image processing system, paper feed roller 21 starts revolution and drives, and paper using P is sent the R of conveyance path from sheet feed stacker 20.Be sent paper using P in the R of conveyance path by contraposition roller to 22 by after calculating opportunity, be sent in the secondary transfer printing clamping between secondary transfer roller 13 and driven roller 10.At this moment, in secondary transfer roller 13, be applied with intermediate transfer belt 9 on the charged opposite polarity transfer voltage of toner of toner image, just in secondary transfer printing clamping, formed transfer electric field thus.
Afterwards, along with intermediate transfer belt 9 around movement, when the toner image on intermediate transfer belt 9 arrives secondary transfer printing clamping, just by the transfer electric field being formed in above-mentioned secondary transfer printing clamping, the toner image on intermediate transfer belt 9 is transferred on paper using P together.In addition, the remaining toner not at this time being transferred to completely on the intermediate transfer belt 9 on paper using P can be removed by the cleaning balde 15 with cleaning device 14, the toner being removed will be by conveyance coil pipe 17 by conveyance be recovered to used toner receptacle 18.
Afterwards, paper using P is by towards fixing device 23 conveyances, and by fixing device 23 by the toner image on paper using P to this paper using P.Then, paper using P is stacked on ADF dish 25 after being discharged to outside device by exit roller to 24.
Although being the image while forming full-color image on recording medium, above explanation forms action, but can be also with the some monochrome images that forms in four processing unit 1Y, 1M, 1C, 1Bk, or use the processing unit of two or three to form afterwards images double-colored or three looks.
Below, the formation of developing apparatus and toner cartridge is elaborated.Also have, above-mentioned each developing apparatus 4 and each toner cartridge 6Y, 6M, 6C, 6Bk because substantially form identical except containing the toner of different colours, for the purpose of simplifying the description, be omitted (Y, M, C, the Bk) of the identification that represents color and the formation of 1 developing apparatus and toner cartridge is described.
It shown in Fig. 2, is the sectional drawing of developing apparatus and toner cartridge.As shown in Figure 2, in the vessel 30 of toner cartridge 6, be provided with agitation of toner and as the paddle 31 of agitating member, and conveyance toner and as the conveyance screw rod 32 of conveyance member.In addition, at toner cartridge 6, be installed under the state on top of developing apparatus 4, also in vessel 30, be provided with the escape hole 33 that is connected to 46 li, the supply mouth that is arranged in developing apparatus 4.When conveyance screw rod 32 revolution, just by after axially conveyance of the toner in vessel 30, carry out the supply of toner in from above-mentioned escape hole 33 to developing apparatus 4.Under the state being mounted at toner cartridge 6, conveyance screw rod 32 is with respect to the not shown drive division being arranged in image forming device body, is the known mechanism by clutch coupling etc. and can linking.Toner replenishing amount can be controlled according to the driving time of drive division.For example, can be according to the color of toner, or change driving time corresponding to the mobility of toner because of the variation that humiture environment produces.
Developing apparatus 4 has comprised the inner developer container 40 that is formed with the developer collecting receiving part 47 of accommodating toner, as the developer roll 41 that loads the developer carrier body of toner, toner is supplied on developer roll 41 and as the donor rollers 42 of developer replenishing member, to being positioned in that the thickness of the toner on developer roll 41 limits and as the developing blade 43 of limiting member, as the conveyance screw rod 44 of the conveyance member of conveyance toner with as the stirrer 45 of the agitating member of agitation of toner.
When imaging action starts, by rotating stirrer 45, the toner in developer collecting receiving part 47 is stirred, and further by rotating conveyance screw rod 44, toner is just fed into donor rollers 42 and has suffered.Be fed into toner in donor rollers 42 along with the revolution of donor rollers 42, when arriving the clamping part that donor rollers 42 contact with developer roll 41, just in this clamping part by towards developer roll 41 supplies.The toner being fed on developer roll 41 moves along with the revolution of developer roll 41, and when the clamping part contacting by developing blade 43 with respect to developer roll 41, by developing blade 43, is limited in uniform thickness.Then, the toner on developer roll 41 by conveyance to photoreceptor 2 in opposite directions and right position (developing regional) when inner, toner has just formed toner image after the electrostatic latent image transfer on photoreceptor 2.
In addition, do not transfer on photoreceptor 2 and remain in toner on developer roll 41 in the clamping part being contacted with developer roll 41 to donor rollers 42 by conveyance again time, can reclaim by donor rollers 42.In the present embodiment, donor rollers 42 in supplying with clamping with respect to the surperficial moving direction of developer roll 41 be in the reverse direction surface movably (in counter-clockwise direction) rotating.Thus, the remaining toner on developer roll 41 just falls to be recycled by the wiping of the donor rollers 42 at counter-clockwise direction upper rotary.
It shown in Fig. 3, is the B-B sectional drawing of Fig. 2.As shown in Figure 3, donor rollers 42 includes as the core 42a of revolving shaft and the elastic layer 42c that sets by means of tack coat 42b in the periphery of core 42a.Core 42a is formed by metal material etc., and elastic layer 42c is formed by the foaming elastic component of polyurathamc, foaming silicon or foaming EPDM (ethylene-propylene-diene rubber) etc.Tack coat 42b is the cementing agent of heat fusing of consisting of thermoplastic resin etc. or double sticky tape etc.The both ends of donor rollers 42 by its core 42a are maintained on developer container 40 and were supported afterwards as turning round.
In addition, as illustrated in fig. 3, in developer container 40, be also provided with the end part seal 50 contacting with the outer peripheral face of the end side of developer roll 41.End part seal 50 is installed in the seal installation portion 40b that the direction of principal axis from the side wall inner surface 40a of developer container 40 to donor rollers 42 arranges highlightedly.By this end part seal 50, to carrying out after leakproof seal between developer roll 41 and developer container 40, the toner just end of developer roll 41 being occurred leaks and has suppressed.Also have, end part seal 50 be also similarly arranged on Fig. 3 in the contrary end side in the end of developer roll 41.
The formation of characteristic of the present invention is described below.As illustrated in fig. 3, in the present invention, the end of donor rollers 42, the direction of principal axis end that is exactly specifically elastic layer 42c is to contact with end part seal 50, and is in compressed state on direction of principal axis.
Be exactly specifically, as shown in the double dot dash line of Fig. 4, the elastic layer 42c of donor rollers 42 is on direction of principal axis, to be formed overlapping length with respect to end part seal 50, is assembling under the state of donor rollers 42, and the overlapping part U of elastic layer 42c is compressed on direction of principal axis.Also have, in the present embodiment, elastic layer 42c and the discontiguous part Q of end part seal 50 (part of downside in figure), also along with the axial compression deformation causing with contacting of above-mentioned end part seal 50, and more or less distortion after being pulled in upper right in the drawings.
As mentioned above, in the present invention, because be to make the end of donor rollers 42 contact with end part seal 50 very close to each otherly, thus past case that just can be as Figure 12 shown in, but can produce the end regions J being attached with on the developer roll that toner donor rollers do not have to contact.That is to say, in the present invention, because donor rollers 42 is attached with on the whole region of toner all states in contact at developer roll 41, so the toner remaining in the end side of developer roll 41 just also can reclaim by donor rollers 42.Consequently, the generation of film forming can be prevented in the end side of developer roll 41, and the generation of the bottom surface pollution of paper using can be avoided.
Also have, although donor rollers 42 and end part seal 50 be at least as long as contact without connecting airtight, as shown in the embodiment, by will confession tying the end of roller 42, on direction of principal axis, compress, and connect airtight with respect to end part seal 50, just can prevent effectively the generation of film forming.
As mentioned above, after the end of donor rollers 42 is contacted with end part seal 50, just can prevent the generation of film forming.But on the other hand, contacting of donor rollers 42 and end part seal 50 can cause rubbing between the two.Especially as illustrated in fig. 3, when the end of donor rollers 42 contacts with compressed state on direction of principal axis, or the end of donor rollers 42 is when also contact with the seal installation portion 40b of developer container 40, will trend towards becoming large because friction causes load.This friction is between the two because can cause the rising of rotary torque of donor rollers 42 or the breakage of heating and roll end etc., so just need to take to reduce the countermeasure rubbing.
So in the present invention, as illustrated in fig. 3, in the specialized range starting in the end from donor rollers 42, being provided with elastic layer 42c is inadherent non-bonded areas E with respect to core 42a.In addition, in this non-bonded areas E, elastic layer 42c is inadherent on whole circumferencial direction with respect to core 42a.
So, by non-bonded areas E is set in donor rollers 42, the distortion at non-bonded areas E elastic layer 42c on direction of principal axis just can not be subject to the restriction of core 42a.That is to say, donor rollers 42 is when contacting with end part seal 50, because the permissible range of the distortion of elastic layer 42c is longer, so the stress that just compression can be produced axially disperse.Consequently, the contact between donor rollers 42 and end part seal 50 reduces, and can also reduce the load that friction causes.
With respect to this, as shown in the comparative example of Figure 10, in donor rollers 42, do not arrange in the formation (elastic layer 42c is the formation for boning on whole direction of principal axis) of non-bonded areas E, the end of elastic layer 42c is limited by core 42a towards axial distortion.At this moment, because the permissible range of the elastic layer 42c distortion of donor rollers 42 while contacting with end part seal 50 is shorter, so will concentrate because compression produces stress.Consequently, it is large that the contact between donor rollers 42 and end part seal 50 becomes, and the load causing because of friction also becomes large.
So, the present invention is different from above-mentioned comparative example, because can reduce the load that causes of friction in the position contacting with end part seal 50 in donor rollers 42, so just can suppress the rising of rotary torque of donor rollers 42 or the breakage of heating and roll end etc.
In addition, at end part seal 50 shown in the double dot dash line of Fig. 4, do not have under the state of compression deformation, the direction of principal axis length L of non-bonded areas is set to is longer than donor rollers 42 because of the direction of principal axis length N that contacts compressed part with end part seal 50.
Be exactly specifically, the direction of principal axis length L of (elastic layer 42c does not have under compressed state on direction of principal axis) non-bonded areas E with below the above 30mm of 3mm for well.This is because when the discontented 3mm of the direction of principal axis length L of non-bonded areas E, can not effectively be dispersed in the pressure producing in the end of donor rollers 42, and the breakage that likely produces roll end.And when the direction of principal axis length L of non-bonded areas E is greater than 30mm because during donor rollers 42 revolution with the frictional resistance of end part seal 50, will in non-bonded areas E, produce the distortion on circumferencial direction, thereby may cause producing inequality in toner quantity delivered.
Shown in Fig. 5, be the result figure of the test carried out for confirming effect of the present invention.In this test, be in the embodiments of the invention 1-4 that the repulsive force of the amount of nipping of the direction of principal axis length of non-bonded areas and end part seal (the direction of principal axis length of the compressed part of donor rollers) and donor rollers is set respectively, for the end whether donor rollers occurs, damaged and bottom surface, end pollution is investigated.
Below, this experiment is elaborated.In each embodiment 1-4, employing be can insert the color printer (the IPSiO SPC310 of company of Ricoh) of processing unit shown in Fig. 2 and toner cartridge after transformation.In addition, the driving of processing unit is to link afterwards and form with imaging drive motor, and, driving for toner cartridge, be by clutch coupling, the drive source of cartridge processing can be linked with toner cartridge, and by linking the driven wheel of drive source and toner cartridge, be configured to and can carry out toner replenishing as required.What in addition, toner adopted is that mean grain size is the black toner of 6.3 μ m.
Donor rollers in each embodiment 1-4 as illustrated in fig. 4, employing be that elastic layer is formed in length overlapping on direction of principal axis with respect to end part seal.The detailed conditions of donor rollers as shown in Figure 5.For the repulsive force of donor rollers, be after the full elasticity aspect of donor rollers is pressed on SUS flat board, by pull and push dynamometer (push-pull gauge), measure repulsive force while being pressed into 1.1mm.In addition, in order to ensure the amount of being pressed into of 1.1mm, be in the both ends of donor rollers, to have installed than after the roller of the little external diameter of the little 2.2mm of external diameter of donor rollers, donor rollers is encountered on flat board.
Then, in temperature, be that under 10 ℃, the humidity environment that is 15%, the image that is 2% by lettering rate prints 3 under each task, until the displacement of photoreceptor (surperficial displacement) arrives 5000m.Afterwards, observing donor rollers and photoreceptor confirms to have or not end breakage and the bottom surface, end of donor rollers to pollute.
Its result as illustrated in fig. 5, in each embodiment 1-4, pollute by end breakage and bottom surface, end that donor rollers does not all occur.The reason that does not occur to pollute bottom surface, end at each embodiment is, as described above, by donor rollers is touched in end part seal, just can prevent from, in the end of developer roll, film forming occurs.In addition, the reason that end breakage does not occur donor rollers is yet, by being provided with non-bonded areas (in an embodiment, direction of principal axis length is in the scope of 5.3-6.7mm), the stress that just compression of donor rollers can be caused axially disperses effectively, and can reduce the load that friction causes.In addition because the repulsive force of donor rollers can reduce the pressure in the end that is applied to donor rollers little time, so when by the elastic layer compression 1.1mm of donor rollers, be make repulsive force below 25N for well.
The sectional drawing of the developing apparatus that other embodiments of the present invention shown in Fig. 6 are related.In the embodiment shown in Fig. 6, be to be provided with low friction member 60 between the end of donor rollers 42 (elastic layer 42c) and end part seal 50.Formation is in addition all identical with above-mentioned embodiment.
So, by low friction member 60 is set between the end in donor rollers 42 and end part seal 50, just can further reduce the friction load occurring in the end of donor rollers 42.As low friction member 60 with the less member of surperficial frictional resistance for well, such as being surface member, the nylon member processed through fluorine element or the sea with surperficial leather layer etc.Further, the friction factor of low friction member 60 unlubricated situation with below 0.5 for well.In addition, the thickness of low friction member 60 (axial thickness) with the decrement of the roller 42 of not increasing supply below 0.5mm for well.
As illustrated in fig. 7, the low friction member 60 in present embodiment is formed the ring-type on the whole circumferencial direction of the elastic layer 42c that is provided in donor rollers 42.Central authorities at low friction member 60 form the porose 60a of portion, by the core 42a of donor rollers 42 is inserted and led in the 60a of this hole portion, low friction member 60 are remained with respect to donor rollers 42 and can be turned round.So, by the low friction member 60 of ring-type being provided on the whole circumferencial direction of elastic layer 42c, just can make donor rollers 42 contact with end part seal 50 and the axial decrement that produces on whole circumferencial direction evenly.Thus, just can further reduce the friction load producing in the end of donor rollers 42.
Shown in Fig. 8, be the figure of the donor rollers that is provided with low friction member 60 42 seen from direction of principal axis.In Fig. 8, shown in dotted line G, be that donor rollers 42 and developer roll 41 are installed in the lower time of state being in contact with one another in developing apparatus, developer roll 41 is the position of nipping in diametric(al) with respect to the elastic layer outer peripheral face of donor rollers 42 elastic layer 42c.In low friction member 60 is provided in and surveys than more inner footpath, the position of nipping of the developer roll 41 shown in dotted line G, to avoid the surperficial butt with developer roll 41.So, by low friction member 60 being provided in not in the position with developer roll 41 butts, just make low friction member 60 can not hinder having contacted of developer roll 41 and donor rollers 42.
As described above, according to the present invention, can prevent the generation of film forming of the end side of developer roll 41, in order further to prevent the generation of film forming, with Fig. 9 illustrated embodiment like that, the end exposure mechanism 70 that the both ends side of photoreceptor 2 is exposed also can be set.This end exposure mechanism 70 can be both the exposure device 7 (with reference to Fig. 1) driving while being different from common imaging action, can be also mechanism identical or that form integratedly.
In common imaging action, be on photoreceptor 2, to form image in the scope shown in the symbol X of Fig. 9.But, in the present invention, because be to make donor rollers 42 ratio length in the past on direction of principal axis, and contact with end part seal 50, at the region X than forming image, more by the region V of direction of principal axis end side, from the toner of donor rollers 42, also can be fed into developer roll 41.In the V of this region, be fed into the toner on developer roll 41 because substantially again reclaimed by donor rollers 42, so less become the film forming on developer roll 41.Yet, because consider that the deteriorated grade of lasting due to donor rollers 42 may cause toner to reclaim the decline of function, so can be also the end side (region V) of exposing on photoreceptor 2 by end exposure mechanism 70, and make forcibly the remaining toner on developer roll 41 shift to photoreceptor 2.Also have, the toner shifting to photoreceptor 2 from developer roll 41 will be removed by being arranged on photoreceptor 2 cleaning device 5 (with reference to Fig. 1) around.So, end exposure mechanism 70 has just played the toner in the end side that is positioned in developer roll 41 (region V) has been shifted to the function as developer carrier body cleaning mechanism of removing afterwards to photoreceptor 2.Thus, just can prevent more to heavens the generation of film forming of the end side of developer roll 41.In addition, while being not limited to common imaging action the opportunity of drive end exposure mechanism 70, as long as suitably set corresponding to the accumulative total driving time of image processing system etc.
As mentioned above, according to the present invention, by the end of developer replenishing member (donor rollers) is contacted with end part seal, the generation of the film forming of the end that just can prevent developer carrier body (developer roll) in surveying.Consequently, the generation that can avoid the bottom surface in the end side of paper using to pollute, and realize the raising of quality.
In addition, according to the present invention, non-bonded areas is set in the specialized range that the end contacting with end part seal by the elastic layer from developer replenishing member starts, and the stress producing after just developer replenishing member can being contacted with end part seal disperses to the direction of principal axis of elastic layer.Consequently, because can reduce the load that causes of friction, so just can suppress the rising of rotary torque of developer replenishing member or the breakage of heating and roll end etc.
Also have, the present invention is not limited to above-mentioned embodiment, as long as just can carry out various changes in the scope that does not depart from main idea of the present invention.In addition, the present invention can be not limited to the printer shown in Fig. 1 by applicable image processing system, can be also duplicating machine, facsimile recorder or their compounding machine etc.
The basis of present patent application and priority request be on 03 01st, 2013, at the Japanese patent application JP2013-040708 of Japan Office application, its full content draws do combination at this.
Claims (10)
1. a developing apparatus, it comprises:
Developer carrier body, it loads developer from the teeth outwards;
Developer replenishing member, its with shown in after the Surface Contact of developer carrier body by developer replenishing to this developer carrier body:
End part seal, it contacts with the end side of described developer carrier body,
Described developer replenishing member includes core and is bonded in the elastic layer on the outer peripheral face of this core,
It is characterized in that, described developing apparatus contacts the end of the elastic layer of described developer replenishing member with described end part seal, and in the specialized range that described developer replenishing member starts in the end contacting with described end part seal from described elastic layer, being provided with respect to described core is inadherent non-bonded areas.
2. developing apparatus according to claim 1, is characterized in that:
The direction of principal axis length of described non-bonded areas is more than 3mm and below 30mm.
3. developing apparatus according to claim 1 and 2, is characterized in that:
Between the end of described elastic layer and described end part seal, there is low friction member.
4. developing apparatus according to claim 3, is characterized in that:
The friction factor of described low friction member is below 0.5.
5. according to the developing apparatus described in claim 3 or 4, it is characterized in that:
Described low friction member be provided in described elastic layer whole circumferencial direction on.
6. according to the developing apparatus described in any one in claim 3 to 5, it is characterized in that:
Described low friction member is provided in than described developer carrier body the position of nipping of the outer peripheral face of described elastic layer is more leaned in internal side diameter.
7. according to the developing apparatus described in any one in claim 1 to 6, it is characterized in that:
Repulsive force during by described elastic layer compression 1.1mm is below 25N.
8. a processing unit, it at least comprises
Sub-image bearing member, it loads sub-image on surface;
Developing apparatus, its by developer replenishing in the sub-image on described sub-image bearing member,
It is constituted as and can loads and unloads with respect to image forming device body,
It is characterized in that, as described developing apparatus, comprised in claim 1 to 7 developing apparatus described in any one.
9. an image processing system, is characterized in that:
Comprise in claim 1 to 7 developing apparatus described in any one, or processing unit claimed in claim 8.
10. image processing system according to claim 9, is characterized in that:
Be provided with developer carrier body cleaning mechanism, regardless of imaging action, the developer that all makes to be positioned in the end side of described developer carrier body shifts to described sub-image bearing member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013040708A JP6112298B2 (en) | 2013-03-01 | 2013-03-01 | Developing device, process unit, and image forming apparatus |
| JP2013-040708 | 2013-03-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104020652A true CN104020652A (en) | 2014-09-03 |
Family
ID=51437474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410057209.1A Pending CN104020652A (en) | 2013-03-01 | 2014-02-20 | Developing unit, processing unit, and image forming device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6112298B2 (en) |
| CN (1) | CN104020652A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110168448A (en) * | 2017-01-31 | 2019-08-23 | 惠普深蓝有限责任公司 | The anti-friction ring of developer roll in liquid electrophotographic printing machine |
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| US20070077084A1 (en) * | 2005-09-30 | 2007-04-05 | Oki Data Corporation. | Developing device and image forming apparatus |
| CN201681256U (en) * | 2010-04-15 | 2010-12-22 | 珠海天威飞马打印耗材有限公司 | Toner cartridge box for laser printer |
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| JPH0628860U (en) * | 1991-03-30 | 1994-04-15 | 東海ゴム工業株式会社 | Semi-conductive roll |
| JP3343406B2 (en) * | 1993-07-23 | 2002-11-11 | 株式会社リコー | Developing device |
| JP3092514B2 (en) * | 1996-05-28 | 2000-09-25 | ブラザー工業株式会社 | Developing device and image forming apparatus including developing device |
| JPH10239982A (en) * | 1997-02-28 | 1998-09-11 | Seiko Epson Corp | Developing unit |
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|---|---|---|---|---|
| JPH10198157A (en) * | 1997-01-14 | 1998-07-31 | Nec Niigata Ltd | Developing device for electrophotography |
| US6151474A (en) * | 1997-01-31 | 2000-11-21 | Seiko Epson Corporation | Developing unit using elastic supply roller |
| CN1285532A (en) * | 1999-08-23 | 2001-02-28 | 兄弟工业株式会社 | Developing device, treating box and imaging equipment |
| US20010009618A1 (en) * | 2000-01-26 | 2001-07-26 | Toshihide Ohgoshi | Developing apparatus |
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| US20130051840A1 (en) * | 2011-08-22 | 2013-02-28 | Canon Kabushiki Kaisha | Electrophotographic image forming apparatus and process cartridge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110168448A (en) * | 2017-01-31 | 2019-08-23 | 惠普深蓝有限责任公司 | The anti-friction ring of developer roll in liquid electrophotographic printing machine |
| CN110168448B (en) * | 2017-01-31 | 2022-11-25 | 惠普深蓝有限责任公司 | Anti-friction ring for developer roller in liquid electrophotographic printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6112298B2 (en) | 2017-04-12 |
| JP2014170046A (en) | 2014-09-18 |
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Application publication date: 20140903 |