CN100524073C - Developing device and image forming apparatus - Google Patents
Developing device and image forming apparatus Download PDFInfo
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- CN100524073C CN100524073C CNB200610150467XA CN200610150467A CN100524073C CN 100524073 C CN100524073 C CN 100524073C CN B200610150467X A CNB200610150467X A CN B200610150467XA CN 200610150467 A CN200610150467 A CN 200610150467A CN 100524073 C CN100524073 C CN 100524073C
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Abstract
A developing device includes a container that contains toner particles that are for developing a latent image borne by an image bearing body, and a toner-particle bearing roller that has a helical groove portion on a surface thereof that is for bearing the toner particles, the helical groove portion having an inclination with respect to an axial direction and a circumferential direction of the toner-particle bearing roller and being formed having a uniform pitch in the axial direction.
Description
Technical field
The present invention relates to developing apparatus and image processing system.
Background technology
The developing apparatus that uses toner-particle to develop is known to be had the developing apparatus with toner-particle bearing roller, this toner-particle bearing roller to be used for carrying toner-particle to hold the toner-particle that body holds and develop.
This developing apparatus is in order to limit by the bed thickness of the toner-particle of toner-particle bearing roller carrying and to make toner-particle charged and be provided with and carry the layer-thickness restriction member of the toner-particle bearing roller butt of toner-particle.In addition, the processing of sandblasting has been passed through on the surface of toner-particle bearing roller, thereby is provided with tiny concavo-convex in its surface.Toner-particle is carried on the surface of toner-particle bearing roller and by the bed thickness limiting part and pushes, and toner-particle rolls when being had frictions such as concavo-convex surface and layer-thickness restriction member thus, thereby charged.
In this developing apparatus, when forming toner-particle bearing roller surface concavo-convex by sandblasting, the size of recess, the degree of depth, shape and aligning method are inhomogeneous.Therefore, for example enter into the toner-particle of dark recess because not by rolling and can't be charged well.Like this, because the uneven cause of the lip-deep jog of toner-particle bearing roller, might the local charged bad or toner-particle that toner-particle takes place enter in the little recess and cause plated film (filming).In addition, if toner-particle not well by charged, then can exist toner-particle to leak and be distributed in the image processing system from developing apparatus, or on image, produce the problem of photographic fog etc.
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Summary of the invention
The present invention makes in view of above problem, and its purpose is to provide a kind of developing apparatus that can make the charged well toner-particle bearing roller of toner-particle that has.
Main invention is following developing apparatus.
Developing apparatus has:
The accommodation section holds and is used for the toner-particle that develops to as the sub-image that carries on the supporting body; And toner-particle bearing roller, have on the surface of described toner-particle with respect to axially and peripheral, oblique and the spiral helicine groove that forms equally spacedly in the axial direction being used to carry.
Come further clear and definite other features of the present invention by accompanying drawing and the following description.
Description of drawings
In order to understand the present invention and advantage thereof more up hill and dale, please also refer to the following description and accompanying drawing.
Fig. 1 is the synoptic diagram that constitutes the main composition part of printer;
Fig. 2 is the figure of the structure of the control module that is used to illustrate that printer has;
Fig. 3 is the stereographic map of yellow developer;
Fig. 4 is the sectional view that the main composition part of yellow developer is shown;
Fig. 5 is the stereographic map that the developer of laying down developer roll is shown;
Fig. 6 is the synoptic diagram that is used to illustrate the developing roller surface shape;
Fig. 7 is the sectional view that is used to illustrate the cross section when cutting off developer roll by the plane of axle;
Fig. 8 is used to illustrate the figure that forms the situation of developer roll by rollforming;
Fig. 9 is the figure that the operation that forms developer roll is shown;
Figure 10 is the figure that is used to illustrate limiting scraper and the state of the developer roll butt that carries toner-particle;
Figure 11 is the figure that is used for illustrating the resolution of screen and sub-image;
Figure 12 is the synoptic diagram of first variation of developer roll;
Figure 13 is the synoptic diagram of second variation of developer roll;
Figure 14 is the synoptic diagram of the 3rd variation of developer roll;
Figure 15 is the schematic perspective view of the developer roll of the developer that relates to of second embodiment;
Figure 16 is the front schematic view of the developer roll of the developer that relates to of second embodiment;
Figure 17 is the cross sectional shape synoptic diagram of the groove that relates to of second embodiment;
Figure 18 is A-A schematic cross-section of Figure 16;
Figure 19 is the schematic perspective view of the developer roll of the developer that relates to of the 3rd embodiment;
Figure 20 is the front schematic view of the developer roll of the developer that relates to of the 3rd embodiment;
Figure 21 is the cross sectional shape synoptic diagram of the groove that relates to of the 3rd embodiment;
Figure 22 is A-A schematic cross-section of Figure 20;
Figure 23 is the front schematic view of the developer roll that relates to of first variation of the 3rd embodiment;
Figure 24 is the key diagram of validity that is used to illustrate first variation of the 3rd embodiment;
Figure 25 is the front schematic view of the developer roll that relates to of second variation of the 3rd embodiment;
Figure 26 is near the enlarged drawing the end of the groove formation portion that relates to of the 4th embodiment;
Figure 27 is the figure that the groove formation portion state of contact of the developer roll that hair yarn and the 4th embodiment relate to is shown;
Figure 28 is the key diagram that the surface structure of image formation system is shown;
Figure 29 is the block diagram that the structure of image formation system shown in Figure 28 is shown.
Embodiment
By the record of this instructions and accompanying drawing, at least can clear and definite following item.
Developing apparatus has:
The accommodation section holds and is used for the toner-particle that develops to as the sub-image that carries on the supporting body; With
Toner-particle bearing roller has on the surface of described toner-particle with respect to axially and peripheral, oblique and the spiral helicine groove that forms equally spacedly in the axial direction being used to carry.
Toner-particle bearing roller develops to the sub-image as bearing roller at the surface bears toner-particle.At this moment, if it is uneven concavo-convex to form the degree of depth, shape etc. on the surface of toner-particle bearing roller, the toner-particle that then for example enters in the toner-particle that is carried in the dark recess will be difficult to roll, thereby is difficult to charged.In addition, when the spacing of regulation and when forming along circumferential groove, because the position at the picture supporting body position relative with groove is constant in the axial direction, therefore the density at the position relative with groove may uprise in the toner picture that is developed at interval in the axial direction.On the other hand, when week upwards at interval regulation spacing and when forming vertically groove, because the sense of rotation of toner-particle bearing roller and the trend of groove be quadrature almost, therefore the rolling of the toner-particle that is carried is very difficult, thereby is difficult to charged.
If on the surface of toner bearing roller as described above, have the developing apparatus of the spiral groove portion that also forms equally spacedly in the axial direction with respect to the axial and circumferential inclination, toner-particle is rolled along with the rotation of toner-particle bearing roller and move simultaneously, thereby make toner-particle charged well.In addition, owing to axially reaching upwards variation successively of week along with the rotation of toner bearing roller as the supporting body position relative with groove, thereby the toner picture that can suppress to be developed produces the phenomenon that density unevenness is spared.
In addition, the degree of depth of described groove also can be below the twice of volume average particle size of described toner-particle.
According to such developing apparatus, because the degree of depth of groove is below the twice of volume average particle size of toner-particle, so the toner-particle that enters in the groove can be not overlapping more than two on the depth direction in groove.Therefore, the toner-particle in the groove is evenly rolled, thereby can make it charged well.
In addition, described sub-image has the point-like sub-image that forms in being divided into cancellate zone, and grid can form with multiple spacing on axially described, and can make described groove in described spacing on axially less than the long spacing in the multiple spacing of described grid.
According to such developing apparatus, the point that each point-like sub-image has been carried out developing all is formed on the part that comprises groove of toner-particle bearing roller.The toner picture that therefore, can suppress to be developed is even because of density unevenness takes place groove.
In addition, developing apparatus also can followingly constitute:
Described toner-particle bearing roller comprises: central portion, and it comprises by the cave in described groove that is provided with and have protuberance with the discontiguous surface of described machining tool of machining tool; And not as the both ends of processing object; Described developing apparatus also has layer-thickness restriction member, this layer-thickness restriction member is used to limit the bed thickness of the described toner-particle that carries on the described toner-particle bearing roller at whole zone and described toner-particle bearing roller butt from the described central portion of described toner-particle bearing roller to described both ends.
According to such developing apparatus, the end face of protuberance and the side face at both ends be positioned at toner-particle bearing roller on the side face of axle center same radius.Therefore, the layer-thickness restriction member of bed thickness that promptly is used in the restriction toner-particle is at whole zone and toner-particle bearing roller butt from the central portion of toner-particle bearing roller to both ends, big bending can not take place in layer-thickness restriction member in the axial direction yet, with the state butt of near flat.That is, because big bending does not take place in layer-thickness restriction member, so can prevent between toner-particle bearing roller and layer-thickness restriction member, to produce the gap.In addition, press roughly evenly, can make toner-particle charged well by the toner-particle that will be carried on by layer-thickness restriction member on the toner-particle bearing roller.
In addition, also can form two kinds with respect to axially reaching the circumferential different described groove in angle of inclination.
According to such developing apparatus, owing on toner-particle bearing roller, formed two kinds of grooves that the angle of inclination is different, so toner-particle moves to both direction along groove.Therefore, can prevent that toner-particle from only moving and being offset to a direction of regulation.
In addition, also can make fixed distance from the end face of described protuberance to the bottom surface of described groove.
According to such developing apparatus, because the fixed distance from the protuberance end face to the groove bottom surface all is similar in the whole zone of groove evenly so enter the amount of the toner-particle in the groove.Therefore, can make the amount that is carried on the toner-particle on the toner-particle bearing roller roughly even in the whole zone of toner-particle bearing roller.
In addition, also can make distance from the end face of described protuberance to the bottom surface of described groove is below the twice of volume average particle size of described toner-particle.
According to such developing apparatus, because the degree of depth of groove is below the twice of volume average particle size of toner-particle, can be in groove so enter into the toner-particle of groove not overlapping more than two on the depth direction.Therefore, can make the toner-particle in the groove not produce rolling unevenly, thereby can make it charged well.
In addition, developing apparatus also can followingly constitute:
Described toner-particle bearing roller comprises: the concavo-convex Ministry of worker that adds, at the central portion that is located axially at of this toner-particle bearing roller, for the carrying toner-particle has carried out concavo-convex processing to its surface; The non-concavo-convex Ministry of worker that adds at the both ends that are located axially at of described toner-particle bearing roller, does not carry out concavo-convex processing to its surface; Pars intermedia concavo-convexly adds the Ministry of worker and described non-concavo-convex adding between the Ministry of worker in that being located axially at of described toner-particle bearing roller is described, and has the little and big radius of radius that add the Ministry of worker than described non-recess than the described concavo-convex maximum radius that adds the Ministry of worker; Described developing apparatus also has layer-thickness restriction member, this layer-thickness restriction member from described toner-particle bearing roller axially on an end to whole zone and this toner-particle bearing roller butt of another end, be used to limit the bed thickness that is carried on this toner-particle on this toner-particle bearing roller.
In the case, can realize the developing apparatus that the bed thickness of the toner-particle that carries on the toner-particle bearing roller is appropriately limited.
In addition, it is big that the radius of described pars intermedia also can add the Ministry of worker's one side at this pars intermedia described concavo-convex, and it is little to add the Ministry of worker's one side at this pars intermedia described non-concavo-convex.
In the case, can realize the developing apparatus that the bed thickness of the toner-particle that carries on the toner-particle bearing roller is appropriately limited.
In addition, the radius of described pars intermedia also can diminish gradually from the described concavo-convex described non-concavo-convex Ministry of worker's one side that adds of the Ministry of worker's one side direction that adds of this pars intermedia.
In the case, can realize the developing apparatus that the bed thickness of the toner-particle that carries on the toner-particle bearing roller is further appropriately limited.
In addition, also can have along the side face of described toner-particle bearing roller and with described non-concavo-convex add that the Ministry of worker contacts be used to the seal member that prevents that toner-particle from leaking, the coating processing has been carried out on the described concavo-convex surface that adds the Ministry of worker, do not handled and coating is carried out on the surface of described pars intermedia.
In the case, can improve the charging property of toner-particle and can prevent the leakage of toner-particle rightly.
In addition, developing apparatus also can followingly constitute:
Described toner-particle bearing roller comprises: groove formation portion, be formed with described groove in its surface, the described toner-particle bearing roller of this groove formation portion axially on the degree of depth of the formed groove in end less than the degree of depth at the described formed groove of central portion on axially of this groove formation portion; Non-groove formation portion in the described outside that is located axially at described groove formation portion, is not formed with described groove; Described developing apparatus also has seal member, and the sealing parts are used to prevent the leakage of toner-particle along the side face of described toner-particle bearing roller and contact with described non-groove formation portion.
In the case, can realize having prevented rightly the developing apparatus of the leakage of toner-particle.
In addition, developing apparatus also can followingly constitute:
Described toner-particle bearing roller comprises: groove formation portion, be formed with described groove in its surface, the described toner-particle bearing roller of this groove formation portion axially on the length direction and the described acute angle that is axially become of the formed groove in end, greater than length direction and the described axial acute angle that is become at the described formed groove of central portion on axially of this groove formation portion; Non-groove formation portion in the described outside that is located axially at described groove formation portion, is not formed with described groove; Described developing apparatus also has seal member, and the sealing parts are used to prevent the leakage of toner-particle along the side face of described toner-particle bearing roller and contact with described non-groove formation portion.
In the case, can realize having prevented rightly the developing apparatus of the leakage of toner-particle.
In addition, the all right following formation of developing apparatus: described toner-particle bearing roller is to the sense of rotation rotation of regulation, and comprise: groove formation portion, be formed with described groove in its surface, the described toner-particle bearing roller of this groove formation portion axially on central portion be formed with as mutually different first groove of the coiling direction of described groove and second groove, only be formed with a certain groove in described first groove and second groove in the described end on axially of this groove formation portion; Non-groove formation portion in the described outside that is located axially at described groove formation portion, is not formed with described groove; Described developing apparatus also has seal member, and the sealing parts are used to prevent the leakage of toner-particle along the side face of described toner-particle bearing roller and contact with described non-groove formation portion; When and in rightabout towards each other two trends at the length direction of the groove that on described end, forms, described trend is made as first when moving towards along the circumferential direction of the described toner-particle bearing roller trend consistent with described sense of rotation, this first trend along the axial direction of described toner-particle bearing roller with from described end towards the direction of described central portion and consistent from the latter of described end towards the direction of described non-groove formation portion.
In the case, can realize having prevented rightly the developing apparatus of the leakage of toner-particle.
In addition, also can carry out the coating processing, not handle and coating is carried out on the surface of described end to the surface of described central portion.
In the case, the charging property of toner-particle can be improved, and the leakage of toner-particle can be prevented rightly.
In addition, all right following formation of developing apparatus:
Described toner-particle bearing roller comprises groove formation portion, on the surface of this groove formation portion, be formed with described groove, described developing apparatus also comprises seal member, the sealing parts are along the side face of described toner-particle bearing roller and contact with described groove formation portion, be used to prevent the leakage of toner-particle, the surface that contacts with described groove formation portion of sealing parts is made of fabric.
In the case, can prevent the leakage of toner-particle rightly.
In addition, developing apparatus also can followingly constitute: described fabric is a pile, the hair yarn that inweaves in the base fabric that this pile has contacts with described groove formation portion, the described developer carrying roller of described hair yarn and described groove formation portion axially on both ends contact, the leading section of described hair yarn described axial on towards the inboard.
In the case, can further prevent the leakage of toner-particle rightly.
Image processing system comprises: the accommodation section, hold and be used for the toner-particle that develops to as the sub-image that carries on the supporting body; And toner-particle bearing roller, have on the surface of described toner-particle with respect to axially and circumferentially and the spiral helicine groove that tilts and form equally spacedly in the axial direction being used to carry.
According to this image processing system, can make toner-particle roll along with the rotation of toner-particle bearing roller and move simultaneously, thereby can make toner-particle charged well.In addition, owing to reach upwards variation successively of week along with the rotation of toner bearing roller axial as the relative position of supporting body and groove, thereby the toner picture that can suppress to be developed generation density unevenness is spared.
[summary of image processing system]
Using Fig. 1, Fig. 2, is that example illustrates that the developer of the developing apparatus that use relates to as present embodiment forms the topology example and the operation example of the image processing system of image with laser printer 10 (below be also referred to as printer).Fig. 1 is the synoptic diagram that constitutes the main composition part of printer 10, and Fig. 2 is the figure of the structure of the control module that is used to illustrate that printer 10 is had.In addition, represent above-below direction with arrow, for example, paper supply tray 92 is configured in the bottom of printer 10, and fixation unit 90 is configured in the top of printer 10.
The structure of＜printer 10 〉
As shown in Figure 1, printer 10 is along having as the sense of rotation of the photoreceptor 20 of an example of supporting body as the carrying sub-image: charged elements 30, exposing unit 40, developer holding unit 50 (being also referred to as the YMCK developing cell), transfer printing unit 60, intermediate transfer body 70, cleaning unit 75 first, and have secondary transfer printing unit 80, fixation unit 90, constitute and as to the display unit 95 of user's notification unit and control said units etc. and grasp the control module 100 of the operation of printer by liquid crystal panel.
In the present embodiment, this developer holding unit 50 can be by rotating the position of moving described four developers 51,52,53,54.Promptly, this developer holding unit 50 keeps described four developers 51,52,53,54 by four handling parts (maintaining part) 50a, 50b, 50c, 50d, and described four developers 51,52,53,54 can be the center and be rotated under the state of keeping the relative position between them with central shaft 50a.When the image of finishing one page forms, relative with photoreceptor 20 selectively, and successively the sub-image that forms on the photoreceptor 20 is developed by the toner that is contained in each developer 51,52,53,54.In addition, each in described four developers 51,52,53,54 all relatively the described handling part of developer holding unit 50 load and unload.In addition, the back will be described in detail each developer.
As shown in Figure 2, control module 100 is made of master controller 101 and cell controller 102, to master controller 101 received image signals and control signal, cell controller 102 is according to the instruction based on this picture signal and control signal, controls described each unit and waits and form image.
Each Drive and Control Circuit etc. that cell controller 102 has storeies such as CPU 120, RAM or ROM 116 and is used for each unit of driving control device main body (charged elements 30, exposing unit 40, transfer printing unit 60, cleaning unit 75, secondary transfer printing unit 80, fixation unit 90, display unit 95) first and developer holding unit 50, and based on controlling each unit from the signal of master controller 101 inputs.
The operation of＜printer 10 〉
Below, the operation of printer 10 and other component part are described.
At first, in the time of in the picture signal of the main frame that does not illustrate in from the way and control signal is input to printer 10 by interface (I/F) 112 the master controller 101, based on the control of carrying out from the instruction of this master controller 101, photoreceptor 20, the developer roll 510 and the intermediate transfer body 70 that are arranged on the developer 51,52,53,54 rotate by cell controller 102.Photoreceptor 20-limit rotation on one side in charged position by charged elements 30 and by charged successively.
The charging zone of photoreceptor 20 arrives exposure position along with the rotation of photoreceptor 20, and forms and first color, the corresponding sub-image of the image information of yellow Y for example by exposing unit 40.At this moment, developer holding unit 50 makes the yellow developer 54 that holds yellow (Y) toner be positioned at the developing location relative with photoreceptor 20.
The sub-image that forms on photoreceptor 20 arrives developing location along with the rotation of photoreceptor 20, and by yellow developer 54 usefulness Yellow toners this sub-image is developed.Thus, on photoreceptor 20, form the Yellow toner picture.
The Yellow toner picture that forms on photoreceptor 20 arrives transfer position first along with the rotation of photoreceptor 20, and is transferred on the intermediate transfer body 70 by transfer printing unit 60 first.At this moment, apply the charged opposite polarity transfer voltage first of polarity and toner to transfer printing unit 60 first.During this period, photoreceptor 20 contacts with intermediate transfer body 70, and secondary transfer printing unit 80 leaves intermediate transfer body 70.
By second color, the 3rd color and the 4th color are repeated above-mentioned processing, the four kind color toners corresponding with each picture signal are transferred on the intermediate transfer body 70 as overlapping.Thus, on intermediate transfer body 70, form the full-color toner picture.
The full-color toner picture that forms on intermediate transfer body 70 arrives the secondary transfer printing position along with the rotation of intermediate transfer body 70, and is transferred on the recording chart as recording medium by secondary transfer printing unit 80.Recording chart from paper supply tray 92 via paper-feed roll 94, register roller 96 and be transported to secondary transfer printing unit 80.In addition, when carrying out transfer operation, secondary transfer printing unit 80 is pressed against on the intermediate transfer body 70 and is applied in secondary transfer printing voltage.
Thereby be transferred on the recording chart the full-color toner picture by fixation unit 90 heating and pressurizing by heat bonding on recording chart.On the other hand, through after the transfer position first, residual (adhering to) toner in its surface scraper plate 76 that is cleaned is wiped off, thereby prepares for being used to form the charged of next sub-image at photoreceptor 20.The toner of being wiped off is recycled in the used toner accommodation section (remaining toner recoverer) that cleaning unit 75 had.
[summary of developer]
Below, the topology example of developer is described with reference to Fig. 3～Fig. 5.Fig. 3 is the stereographic map of yellow developer.Fig. 4 is the sectional view that the main composition part of yellow developer is shown.Fig. 5 is the stereographic map that the developer of laying down developer roll is shown.Sectional view shown in Figure 4 is that the figure that cuts off the cross section of yellow developer with the face perpendicular to length direction shown in Figure 3 is shown.In addition, identical with Fig. 1 in Fig. 4, represent above-below direction with arrow, for example, the central axis of developer roll 510 is in the position lower than the central shaft of photoreceptor 20.In addition, figure 4 illustrates the state that yellow developer 54 is positioned at the developing location relative with photoreceptor 20.
In developer holding unit 50, be provided with the black toner developer 51, the magenta developer 52 that holds magenta (M) toner that hold black (K) toner, hold the cyan developer 53 of cyan (C) toner and the yellow developer 54 that holds yellow (Y) toner.Because the structure of each developer is identical, therefore below yellow developer 54 is described.
The structure of＜yellow developer 54 〉
The top of first 530a of toner accommodating portion and second 530b of toner accommodating portion is communicated with, and under state shown in Figure 4, limits moving of toner T by spaced walls 545.But, when 50 rotations of developer holding unit, be contained in toner among first 530a of toner accommodating portion and second 530b of toner accommodating portion and focus on the connection position of developing location top one side temporarily, and when returning to state shown in Figure 4, these toners are mixed and turn back among first 530a of toner accommodating portion and second 530b of toner accommodating portion.That is, be rotated the toner T that stirs in the developer by developer holding unit 50.Therefore, in toner accommodating body 530, mixing component is not set in the present embodiment, but can be provided for the mixing component that agitation of toner is held the toner T that holds in the body 530 yet.As shown in Figure 4, shell 540 has opening 572 in the bottom, and developer roll 510 described later is provided with in the face of this opening 572.
Toner feed rolls 550 is by having elasticity and the 550a of roller portion that is for example formed by isocyanurate foam and constituting as the axis body 550b of the rotation center of the 550a of roller portion.Toner feed rolls 550 is supported on the shell 540 by the two ends of axis body 550b, can rotate freely around axis body 550b thus.The described roller 550a of portion is accommodated among described first 530a of toner accommodating portion (in the shell 540) of shell 540, and the toner T that is contained among first 530a of toner accommodating portion is supplied to developer roll 510.Toner feed rolls 550 is set at the vertical lower of first 530a of toner accommodating portion.The toner T that is contained among first 530a of toner accommodating portion is supplied to developer roll 510 in the bottom of this first toner accommodating 530a of portion by toner feed rolls 550.In addition, the residue toner T that will remain in after toner feed rolls 550 will be developed on the developer roll 510 peels off from developer roll 510.
Toner feed rolls 550 and developer roll 510 are installed on the shell 540 with the state of mutual extrusion.Therefore, the 550a of roller portion of toner feed rolls 550 is connected on the developer roll 510 with the state of elastic deformation.Toner feed rolls 550 is towards the direction opposite with the sense of rotation (being counterclockwise in Fig. 4) of developer roll 510 (being clockwise direction in Fig. 4) rotation.Axis body 550b is in the position lower than the rotary middle spindle of developer roll 510.
In addition, as shown in Figure 3, developer roll 510 is supported in two ends of its length direction, and can be that the center is rotated with the central shaft.As shown in Figure 4, developer roll 510 is towards the direction opposite with the sense of rotation (being clockwise direction in Fig. 4) of photoreceptor 20 (being counter clockwise direction in Fig. 4) rotation.Its central shaft is in the position lower than the central shaft of photoreceptor 20.
In addition, as shown in Figure 4, under the relative state of yellow developer 54 and photoreceptor 20, between developer roll 510 and photoreceptor 20, there is the space.That is, yellow developer 54 develops to the sub-image that forms on the photoreceptor 20 with contactless state.In addition, when the sub-image that forms on the development photoreceptor 20, between developer roll 510 and photoreceptor 20, form alternating electric field.
Limiting scraper 560 apply electric charge to the toner T that is carried on the developer roll 510, and restriction is carried on the bed thickness of the toner T on the developer roll 510 at whole zone and developer roll 510 butts from the axial end of developer roll 510 to another end.This limiting scraper 560 has rubber section 560a and the 560b of rubber bearing portion.Rubber section 560a is made of silicon rubber, urethane rubber etc., and the 560b of rubber bearing portion is the rubber-like thin plate that is made of phosphor bronze, stainless steel etc.Rubber section 560a is along the length direction of the 560b of rubber bearing portion and be provided with and be supported in Width one distolateral of the 560b of rubber portion, and the 560b of rubber portion is supported in screed support sheet metal 562 with its other end state is installed on the shell 540 by this limiting scraper supporting metal sheets 562.In addition, the side opposite with developer roll 510 at limiting scraper 560 is provided with the scraper plate back part 570 that is made of Moltopren etc.
Here, by the elastic force that the bending by the 560b of rubber bearing portion produces, rubber section 560a is pressed against on the whole zone from central portion to both ends of developer roll 510.In addition, scraper plate back part 570 prevents that toner T from entering between 560b of rubber bearing portion and the shell 540, thereby keep elasticity stable, and push rubber section 560a and rubber section 560a is pressed to developer roll 510 to the direction of developer roll 510 by positive behind from rubber section 560a by the bending generation of the 560b of rubber bearing portion.Butt homogeneity when therefore, scraper plate back part 570 has improved rubber section 560a and developer roll 510 butts.
Limiting scraper 560 with by the end of the opposite side of a side of screed support sheet metal 562 supporting, be that front end does not contact with developer roll 510, but contact with developer roll 510 with certain width by the part of leaving predetermined distance from this front end.In other words, limiting scraper 560 is at edge and developer roll 510 butts, but the plane that is had by rubber section 560a is at middle butt.In addition, limiting scraper 560 disposes towards the mode of the upstream of the sense of rotation of developer roll 510 side according to front end 560a, promptly so-called reverse butt.Limiting scraper 560 is in the position lower and higher than the central shaft of toner feed rolls 550 than the central shaft of developer roll 510 with the butt position of developer roll 510 butts.
In addition, the 560b of rubber bearing portion developer roll 510 axially on be provided with longlyer than rubber section 560a, and extend out laterally respectively from the two ends of rubber section 560a.Be provided with for example nonwoven fabric end seal 527 thicker than rubber section 560a at the position that extends out of the 560b of rubber bearing portion, this end seal 527 is bonded on described position and the surperficial identical surface 560a of adhesive rubber portion.At this moment, rubber section 560a axially on end face and the side butt of end seal 527.
The operation of＜yellow developing apparatus 54 〉
In the yellow developer 54 that as above constitutes, the toner T that toner feed rolls 550 will be contained in the toner accommodating portion 530 is supplied to developer roll 510.Be supplied to the toner T of developer roll 510 to arrive the butt position of limiting scraper 560 along with the rotation of developer roll 510, and by this butt position the time, be applied in electric charge and be limited bed thickness.
Arrived the developing location relative by the toner T on the charged developer roll 510 by being further rotated of developer roll 510 with photoreceptor 20, and under of the effect of this developing location at alternating electric field by development for the sub-image that on photoreceptor 20, forms.Passed through toner T on the developer roll 510 of developing location along with being further rotated of developer roll 510 by last seal 520, and be recovered in the developer by last seal 520 and do not wiped off.In addition, the toner T that still remains on the developer roll 510 is peeled off by described toner feed rolls 550.
[surface configuration of developer roll 510]
Fig. 6 is the synoptic diagram that is used to illustrate the developing roller surface shape.Fig. 7 is the sectional view that is used to illustrate the cross section when cutting off developer roll by the plane of axle.In Fig. 6, show the groove on developer roll 510 surfaces with straight line for convenience, but, should be curve so tell me up exactly because groove forms spiral fashion.
510 axial central portion 510a are provided with the jog that is used to carry toner-particle at developer roll, have the side face of the slyness that described end seal 527 can be adjacent at both ends 510b.
As shown in Figure 6, on the central portion 510a of the developer roll 510 of present embodiment, be formed with spiral helicine groove 511, this groove 511 with respect to developer roll 510 axially and peripheral, oblique and forming equally spacedly in the axial direction.Here two kinds of axial and circumferential different described grooves 511 in angle of inclination have been formed with respect to developer roll 510.Described two kinds of grooves, 511 formation clathrates intersected with each other, the approximate square that forms of end face 512a of the protuberance 512 that surrounds by described two kinds of grooves 511.In addition, two kinds of described grooves 511 form in such a way: one in two diagonal line that square had of the end face 512a of protuberance 512 along the circumferential direction.
That is, in two kinds of grooves 511 one forms the spiral fashion with the axle of developer roll 510 angle at 45 in the clockwise direction, and another forms the spiral fashion with the axle of developer roll 510 angle at 45 in the counterclockwise direction.Therefore, the intersecting angle of a groove 511a and another groove 511b is 90 °.In addition, groove 511a and another groove 511b developer roll 510 axially on spacing equate that therefore, the shape approximation of the end face 512a of the protuberance 512 that is surrounded by two kinds of grooves is square.
As shown in Figure 7, two kinds of grooves 510 respectively developer roll 510 axially on form with the interval of 80 μ m, the angle from the end face 512a of protuberance 512 to the sloping portion 511d of the bottom surface 511c of groove 511 forms in such a way: two inclined-planes that will form groove 511 prolong and the intersecting angle α of the imaginary plane of formation is 90 ° to the direction of axle center C.
In addition, the degree of depth of groove 511, promptly the distance from the end face 512a of protuberance 512 to the bottom surface 511c of groove 511 is approximately about 7 μ m for fixing.Here, the volume average particle size of toner is about 5～10 μ m, and the degree of depth of groove 511 is set to below the twice of volume average particle size of toner.
Form above-mentioned developer roll 510 by rollforming.Fig. 8 is used to illustrate the figure that forms the situation of developer roll by rollforming.Fig. 9 is the figure that the operation that forms developer roll is shown.
At first, with material cylindraceous be cut to the central portion 510a that can be formed for carrying toner and with the length of the end 510b of end seal 527 butts, thereby cut out cylinder part 515 (S001).On cylinder part 515, form stage portion 510c (Fig. 6) by cut, be used for having the flange 513 (S002) of the axle of developer roll 510 in the interior perimembranous embedding at both ends.Here, flange 513 has: discoid flange body 513a has the diameter that can be pressed among the formed stage portion 510c; And axial region 513b, setting is protruded at the center perpendicular to disc face from this flange 513.
Then, will have the flange 513 of axial region 513b so that its axial region 513b is embedded into respectively in the inboard at both ends to the outstanding mode in the outside of cylinder part is formed with in the cylinder part 515 of stage portion 510c (S003).
Then, making the cylinder part 515 that has embedded flange 513 is that the center is rotated with the axle under the supported situation of the axial region 513b at two ends, and the whole outer peripheral face of cylinder part 515 cut slightly, so that the whole zone on surface with spool concentric, promptly have fixing distance with axle, and grind on the surface to cylinder part 515, thereby form not rollforming processing developer roll 509 (S004).
The device with two kinds of moulds as machining tool (dies) 900 by as shown in Figure 8 carries out rollforming to the cylinder part 515 of surface through grinding, thereby forms two kinds of groove 511a, 511b (S005) in its surface.In the rollforming device, during equidirectional rotation, dispose parts (here for not rollforming process developer roll 509) being disposed at relative locational two kinds of moulds 900, two kinds of moulds 900 are pressed to not rollforming processing developer roll 509, and make rollforming processing developer roll 509 not to the direction rotation opposite and transport vertically with mould 900.On mould 900, be respectively equipped with the sword 900a that is used to form above-mentioned groove 511a, 511b, each sword 900a is set obliquely, so that the groove 511a, the 511b that become by each tooth shape straight ahead on the surface of rollforming processing developer roll 509 not.Here, with mould 900 and not the position of the surperficial butt of rollforming processing developer roll 509 be not to cut parts energetically in rollforming as sword 900a, form recess but roll parts by pressing force.In addition, when carrying out this rollforming, make mould 900 not with the both ends 510b butt of the processing of rollforming not developer roll 509, do not have concavo-convex slick and sly surface thereby keep at both ends 510b.That is, the end face 512a of the protuberance 512 that does not contact with mould 900 among the central portion 510a has on the position of equidistance L with not being positioned at from axle center C as the both ends 510b of the processing object of rollforming.So the surperficial 510d of developer roll 510 is basically by by bottom surface 511c that contacts cave in the groove 511a, the 511b that are provided with mould 900 and the non-machined surface covering that contact with mould 900.
Also can for example carry out processing such as electroless plating Ni-P, plating, plating hard chromium as required to the developer roll 510 that forms by rollforming.
From toner feed rolls 550 to this developer roll 510 and both ends 510b supplying toner between the end seal 527 of butt respectively, and at the bed thickness of the pressing position restriction toner layer of limiting scraper 560.At this moment, limiting scraper 560 is subjected to the pushing of the whole zone from both ends 510b to central portion 510a of developer roll 510, but, do not push developer roll 510 with the state of near flat so big bending does not take place limiting scraper 560 because the both ends 510b of developer roll 510 and the end face 512a of protuberance 512 have fixing distance L from axle center C.Therefore, for example with limiting scraper 560 from the central portion 510a of developer roll 510 to the whole regional butt of both ends 510b the state butt of big bending with near flat do not take place in the axial direction.That is,, therefore can prevent between developer roll 510 and limiting scraper 560, to produce very large gap because big bending does not take place limiting scraper 560.
In addition, owing to each end face 512a that clips the protuberance 512 that the groove 511 as recess disposes to each other on the surperficial 510d of developer roll 510 is positioned on the position of axle center C fixed range L, so the end face 512a of each protuberance 512 is positioned on the side face that forms with single diameter of developer roll 510.Therefore, for example when the tabular surface of limiting scraper 560 being pressed to developer roll 510 1 sides for the bed thickness that limits the toner-particle T that is carried, owing to the toner-particle on the end face 512a that is carried on each protuberance 512 is pushed equally, so can make the bed thickness of the toner-particle T that is carried on the developer roll 510 roughly even in the whole zone of developer roll 510.
And, because the distance from the end face 512a of protuberance 512 to the bottom surface 511c of groove 511 is below the twice of volume average particle size, is below two toner-particle degree so can make the bed thickness of the toner layer that is formed by the toner-particle that enters between developer roll 510 and the limiting scraper 560.That is, do not have a large amount of toner-particles and enter in the groove 511, and when being limited scraper plate 560 and pushing, nearly all toner-particle all can with some contact the in the surface of the surperficial 510d of developer roll 510 and limiting scraper 560.Therefore, each toner-particle T is subjected to same pushing and is easy to roll, and toner-particle is difficult to be trapped in the groove 511, thereby can make toner-particle T even and charged well.Therefore, toner-particle is carried on reliably to be supplied on the developer roll 510 in development, and between the surperficial 510d of developer roll 510 and limiting scraper 560, do not produce very large gap in addition, therefore can prevent that toner-particle T from leaking into the outside of developer 51,52,53,54.
Figure 10 is the figure that is used to illustrate limiting scraper and the state of the developer roll butt of carrying toner-particle.
Especially, the degree of depth of the groove 511 of the developer roll 510 of present embodiment is 7 μ m, compares with the volume average particle size of toner-particle T, roughly be one doubly.Therefore, because limiting scraper 560 be rubber system and concavo-convex along the surperficial 510d of developer roll 510, so toner-particle T can be not overlapping, can be at the whole zone formation thickness and the toner layer that toner-particle is suitable on developer roll 510 surfaces.By on the surperficial 510d of developer roll 510, forming the toner layer of a thickness, can in the whole zone of protuberance 512 that comprises central portion 510a and groove 512, make each toner-particle T reliably charged, and it is carried on the developer roll 510 reliably, thereby can improve the transfer printing when developing, and can prevent that toner from leaking into the developer outside.
That is, if it is uneven concavo-convex to form size, the degree of depth, shape etc. on the surperficial 510d of developer roll 510, the toner-particle that then enters in the toner-particle that is carried in the dark recess will be difficult to roll, thereby is difficult to charged.In addition, when in the axial direction with the interval of regulation and along circumferential formation groove, even photoreceptor 20 rotations, the position of the photoreceptor 20 relative with groove on axially is also constant, therefore, in the toner picture that is developed, may have only the density at the position relative to uprise with groove.On the other hand, when forming groove vertically,,, thereby be difficult to charged so the toner-particle that is carried is difficult to rolling because the sense of rotation of toner-particle bearing roller is almost vertical with the trend of groove.
In addition, owing on the developer roll 510 of present embodiment, formed two kinds of groove 511a, 511b that the angle of inclination is different, so toner-particle T moves to both direction along groove 511a, 511b.Therefore, can prevent that toner-particle T from only moving and being offset to a direction of regulation.And, because two kinds of described groove 511a, 511b formation clathrates intersected with each other, so also might roll along another groove 511b (511a) halfway once the toner-particle T that rolls along a groove 511a (511b).Therefore, the moving direction that can further suppress toner-particle T effectively is offset.
And, because the end face 512a of the protuberance 512 that is surrounded by two kinds of grooves 511 is a square, and a diagonal line that should square had along the circumferential direction, so two drift angles and two drift angles vertically that the edge of protuberance 512 is circumferential are the right angle, two kinds of groove 511a, 511b are with respect to circumferentially and axially and the inclination equal angular.Therefore, can constitute toner-particle T towards circumferentially reaching the structure that axially all moves easily.Therefore, toner-particle is rotated more equably, thus charged more equably.
In addition, the bed thickness that is carried on the lip-deep toner-particle T of developer roll 510 is limited the plane restriction of the rubber section 560a that scraper plate 560 had, so the surface of developer roll 510, especially can not be limited scraper plate 560 by the toner-particle T of protuberance 512 carryings and scrape off fully.That is the bed thickness of restriction toner-particle T under the state that can all carry toner-particle T, at the groove 511 and the protuberance 512 of developer roll 510.In addition; because being carried on toner-particle T on the surperficial 510d is limited the plane that scraper plate 560 had and pushes; thereby; some and toner-particle or toner-particle in surface by developer roll 510, the limiting scraper 560 rub each other, can make toner-particle T charged well.
As mentioned above, laser printer uses laser beam to form sub-image on photoreceptor 20, and by the toner that is carried on the developer roll 510 sub-image that forms is developed.At this moment, come to form the point-like sub-image in the cancellate zone, be screen along main scanning direction (axially) laser beam scanned by ON/OFF being divided on photoreceptor 20.Constitute sub-image by these point-like sub-images.
In addition, under the situation of the developer roll 510 that as present embodiment, has groove (recess) 511 that clearly differentiate and protuberance 512,, may have more toner-particle T and enter in the groove 511 for example than protuberance 512.At this moment, in the toner picture, the density by groove 511 position of developing and the position of developing by protuberance 512 may be different.Particularly, though little for the influence of the little image of the area as literal or lines, for photo, image that the illustration homalographic is big, sometimes density inhomogeneous often clearly.Groove 511 spacing in the axial direction on being formed on developer roll 510 is during greater than the spacing of the grid of above-mentioned screen on main scanning direction, and such phenomenon is more remarkable.This be because, even if the former point that should form with equal densities, also according to being that groove 511 by developer roll 510 is developed, or causes density to produce difference by the difference that protuberance 512 is developed.
Therefore, in the developer roll 510 of present embodiment, make the groove 511 that is formed on the developer roll 510 axially on the maximum spacing of the grid of spacing when forming photo or illustration etc. and have the image of area.The spacing of the grid of sub-image on main scanning direction when here, forming photo or illustration etc. and have large-area image is not a spacing between point in the image of the laser printer highest resolution that can form.This be because, when using laser printer to form photo or illustration etc. to have large-area image, forming point, and make each point have contrast than the low resolution of highest resolution that printer was had, improve whole picture quality thus.
Figure 11 is the figure that is used for illustrating the spacing of screen and sub-image.As shown in figure 11, for example when the highest resolution of printer was 600dpi (spacing is 42.5 μ m), if making the resolution of sub-image is 600dpi, the zone that then can form the point-like sub-image was divided into the clathrate that spacing is 42.5 μ m.Therefore, each zone that is divided can only be to have or do not have the point-like sub-image, and can't show contrast (top of Figure 11).
Therefore, when formation has large-area image, for example with three point-like sub-images in the resolution of 600dpi as a point-like sub-image, and in the time that can respond three point-like sub-images under the resolution of semiconductor laser at 600dpi, change the time span of outgoing laser beam, show contrast (bottom of Figure 11) thus.At this moment, the resolution that forms when having large-area image is 200dpi, and the zone that can form the point-like sub-image is divided into the clathrate that spacing is 127.5 μ m.Therefore, the developer roll 510 of present embodiment by with groove 511 axially on spacing be made as 80 μ m, can make being divided into 200dpi, being that spacing is that each point-like sub-image of the sub-image that forms in the clathrate zone of 127.5 μ m all the groove 511 by comprising developer roll 510 and the position of protuberance 512 is developed, even thereby the toner picture that has suppressed to be developed produces density unevenness.In the present embodiment, following example is illustrated, in this example, the highest resolution of laser printer is made as 600dpi, can form the axial spacing point-like sub-image, that be divided into cancellate zone when forming image such as photo and be made as 127.5 μ m, and the axial spacing of the groove 511 of developer roll 510 is made as 80 μ m.But be not limited thereto example.The groove 511 of developer roll 510 axially on spacing if less than form in the sub-image when forming image such as photo the point-like sub-image, to be divided into cancellate regional axial spacing just passable.In addition, particularly, when adjacent grooves portion 511 and protuberance 512 ultimate range in the axial direction less than can form the point-like sub-image, when being divided into cancellate zone, because a point-like sub-image is developed by place's groove 511 and place's protuberance 512 at least, so it is even to suppress the density unevenness of picture of large image scale effectively.For example, when groove 511 axially on breadth extreme be 40 μ m, protuberance 512 axially on breadth extreme when being 40 μ m, comprise place's groove 511 and place's protuberance 512 owing to be divided into spacing and be in cancellate, the zone that can form the point-like sub-image of 127.5 μ m, so it is even to suppress the density unevenness of picture of large image scale effectively.
In the present embodiment, be that foursquare example is illustrated to the end face 512a of the protuberance 512 that surrounds by two kinds of groove 511a, 511b, but be not limited thereto.Figure 12 is the synoptic diagram of first variation of developer roll.Figure 13 is the synoptic diagram of second variation of developer roll.Figure 14 is the synoptic diagram of the 3rd variation of developer roll.
In the developer roll 510 of first variation, will be made diamondwise by the end face 512a of the protuberance 512 of two kinds of grooves, 511 encirclements, and so that a mode along the circumferential direction in two diagonal line that each described rhombus had has formed groove.In the developer roll 510 of first variation, owing to also form recess by above-mentioned rollforming, so, the end face 512a that on the central portion 510a of developer roll 510, mutually disposes not the protuberance 512 that is contacted by mould 900 across recess each other, and this end face 512a all is positioned on the equidistant position of axle center C with the both ends 510b as the rollforming processing object not.
According to this developer roll 510, because so that a mode along the circumferential direction in two diagonal line that each described rhombus had has formed groove 511, so, two kinds of grooves 511 from along a circumferential cornerwise drift angle to axial both end sides inclination equal angular.Therefore, the toner-particle T that moves along two kinds of grooves 511 almost similarly the both end sides on axially move, thereby toner-particle is moved equably, this point is that foursquare occasion is the same with the end face 512a of protuberance 512.And when long in two diagonal line of the protuberance 512 that assumes diamond in shape at an end face 512a diagonal line along the circumferential direction the time, two drift angles along the circumferential direction in the protuberance 512 that end face 512a assumes diamond in shape acutangulate, and two drift angles vertically become the obtuse angle.Therefore, it is easier of the structure that circumferentially moves to constitute toner-particle.
In addition, as shown in figure 13, when the short-and-medium diagonal line of two diagonal line of the protuberance 512 that assumes diamond in shape at end face 512a along the circumferential direction the time, two drift angles along the circumferential direction in the protuberance that end face assumes diamond in shape become the obtuse angle, and two drift angles vertically acutangulate.In the developer roll 510 of second variation, owing to also form recess by above-mentioned rollforming, so, the end face 512a that on the central portion 510a of developer roll 510, mutually disposes the protuberance 512 that is not contacted by mould 900 across recess each other and the end face 512a of the protuberance 512 that is not contacted on the central portion 510a by mould 900 all be positioned on the equidistant position of axle center C with both ends 510b not as the rollforming processing object.
Therefore, can constitute toner-particle and be easier to moving axially, thus the structure that can disperse toner-particle in the whole zone of developer roll 510 better.
In the present embodiment, the example that has two kinds of groove 511a, 511b on the surface of developer roll 510 is illustrated, but the 3rd variation that also can be as shown in figure 14 is such, has only a kind of groove 511.In the developer roll 510 of the 3rd variation, owing to also form recess by above-mentioned rollforming, so, the surface that on the central portion 510a of developer roll 510, mutually disposes the protuberance 512 that is not contacted by mould 900 across recess each other and the surface of the protuberance 512 that is not contacted on the central portion 510a by mould 900 all be positioned on the equidistant position of axle center C with both ends 510b not as the rollforming processing object.
At this moment, make toner-particle move and make its charged effect though have to the direction of regulation, but charged and can make its structure of further disperseing in the whole zone of developer roll 510 with regard to making toner-particle well, the effect of developer roll 510 of above-mentioned embodiment with two kinds of groove 511a, 511b is more excellent.
[other embodiments (second embodiment to the, four embodiments etc.)]
More than based on above-mentioned embodiment to being illustrated according to developing apparatus of the present invention etc., but above-mentioned working of an invention mode is only to be used for making easy to understand of the present invention, and is not to be used for limiting the present invention.The present invention can change, improve under the situation that does not break away from its aim, and also comprises its equivalent certainly among the present invention.
In the above-described embodiment, be that example is illustrated image processing system with panchromatic laser printer, but the present invention also go in the various image processing systems such as monochromatic laser printer, duplicating machine, facsimile recorder.
In addition, show the example that printer has a plurality of handling parts in the above-described embodiment, but also can be the structure with following cap unit, this cap unit inserts by the developer that should install in the handling part that only is provided with and can close.In addition, in the above-described embodiment, be that example is illustrated with image processing system, but be not limited thereto with rotary type developing device.For example, also can apply the present invention to have in the image processing system of tandem developing apparatus.
In addition, photoreceptor also is not limited to by the light-sensitive roller that photographic layer constitutes is set on the outer peripheral face of conductive base material cylindraceous, also can be by on the surface of the conductive base material of band shape the sensitization band that photographic layer constitutes being set.
In addition, as preferred other embodiments, can list second following embodiment and the 4th embodiment.
[second embodiment]
The topology example of the developer roll 510 of the developer of＜＜the second embodiment〉〉
Here, use Figure 15 to Figure 18 that the structure example of the developer roll 510 of the developer that second embodiment relates to is described.Figure 15 is the schematic perspective view of developer roll 510, shows the mutually different spiral helicine first groove 1518a of coiling direction and the second groove 1518b.Figure 16 is the front schematic view of developer roll 510, shows the concavo-convex Ministry of worker 1512, the non-concavo-convex position relation that adds the Ministry of worker 1514 and pars intermedia 1516 of adding of developer roll 510.Figure 17 is the cross sectional shape synoptic diagram of groove 1518.Figure 18 is A-A schematic cross-section of Figure 16, shows the difference of the degree of depth of the groove 1518 of the degree of depth of the concavo-convex groove 1518 that adds the Ministry of worker 1512 and pars intermedia 1516.In Figure 15 to Figure 18, be easier to understand in order to make figure, the ratio of groove 1518 grades is with actual different.In addition, figure 17 illustrates along the cross section of direction shown in the symbol X among Figure 16.
The developer roll 510 carrying toner T of the developer that second embodiment relates to also are transported to the developing location relative with photoreceptor 20 with it.This developer roll 510 is the parts that constitute with aluminium alloy, ferroalloy etc.As Figure 16, shown in Figure 180, developer roll 510 mainly is divided into three parts (the concavo-convex Ministry of worker 1512, the non-concavo-convex Ministry of worker 1514, the pars intermedia 1516 of adding of adding) according to its surperficial textural difference.
The concavo-convex Ministry of worker 1512 that adds is parts that are located axially at central portion at developer roll 510, in order to carry toner T rightly concavo-convex processing (concavo-convex protuberance and the recess both sides that add the Ministry of worker 1512 are all worked as being used to carry the toner supporting part of toner) has been carried out on its surface.In the present embodiment, above-mentioned rollforming processing is adopted in described concavo-convex processing, forms recess and protuberance by this rollforming processing on the concavo-convex surface that adds the Ministry of worker 1512.Say in further detail, form groove 1518 by rollforming processing on the concavo-convex surface that adds the Ministry of worker 1512, thus, the concavo-convex Ministry of worker 1512 that adds has as the groove 1518 of recess with as the non-groove 1519 of protuberance.
In the present embodiment, shown in Figure 15 and 16, be provided with the mutually different spiral helicine first groove 1518a of coiling direction and the second groove 1518b as groove 1518.The length direction of the first groove 1518a all is about 45 degree with the size of the described acute angle that is axially become and the length direction of the second groove 1518b with the size of the described acute angle that is axially become.In addition, as shown in figure 17, the width of groove 1518 and the degree of depth are about 80 μ m, 7 μ m respectively, and groove angle (angle of representing with symbol in Figure 17) is about 90 degree.In addition, in the present embodiment, toner T is (graininess) in pelletized form, and because the volume average particle size of toner T is about 7 μ m, thereby the size of the volume average particle size of the degree of depth of groove 1518 and toner T is about equally.
In addition, electroless plating Ni-P having been carried out on this concavo-convex surface that adds the Ministry of worker 1512 handles.
The non-concavo-convex Ministry of worker 1514 that adds is the parts of not carrying out above-mentioned concavo-convex processing (rollforming processing) in its surface.These non-concavo-convex both ends that are located axially at that add the Ministry of worker 1514 at developer roll 510, its surface become level and smooth state (10 mean roughness Rz on this surface are that 1 μ m is following).With concavo-convex to add the Ministry of worker 1512 different, electroless plating Ni-P do not carried out on this non-concavo-convex surface that adds the Ministry of worker 1514 and handle.
Pars intermedia 1516 is in the concavo-convex Ministry of worker 1512 and the non-concavo-convex part that adds between the Ministry of worker 1514 of adding of being located axially at of developer roll 510, and it has and this concavo-convex Ministry of worker 1512, this non-concavo-convex different surface structure of the Ministry of worker 1514 that adds of adding.
Promptly, as shown in figure 16, on the surface of pars intermedia 1516 with the concavo-convex Ministry of worker 1512 of adding the samely by rollforming processing formation spiral helicine groove 1518 (the first groove 1518a and the second groove 1518b), but, as shown in figure 18, the degree of depth of this groove 1518 is different with the degree of depth of the concavo-convex groove 1518 that adds the Ministry of worker 1512.In addition, with concavo-convex to add the Ministry of worker 1512 different, electroless plating Ni-P do not carried out on its surface and handle.
Difference to gash depth is carried out more specific description.According to Figure 18 as can be known, the degree of depth of lip-deep all grooves 1518 that is formed at pars intermedia 1516 less than the degree of depth that is formed at the concavo-convex lip-deep groove 1518 that adds the Ministry of worker 1512 (in Figure 18, for shoulder only shows three grooves 1518 that are arranged on the pars intermedia 1516, but in fact be provided with groove 1518) more than three at pars intermedia 1516.In addition, in being formed at the lip-deep groove 1518 of pars intermedia 1516, the degree of depth of the concavo-convex groove 1518 that adds the Ministry of worker's 1,512 one sides that is positioned at pars intermedia 1516 is big, and it is little to be positioned at the degree of depth of the non-concavo-convex groove 1518 that adds the Ministry of worker's 1,514 one sides).And, the closer to the non-concavo-convex Ministry of worker 1514 that adds, the degree of depth of groove 1518 just more little (in other words, the closer to the concavo-convex Ministry of worker 1512 that adds, the degree of depth of groove 1518 is just big more).
Here, to concavo-convexly add the Ministry of worker 1512, the non-concavo-convex radius that adds the Ministry of worker 1514, pars intermedia 1516 is investigated.As mentioned above, in the present embodiment, owing to form groove 1518, so non-groove 1519 is because (in Figure 18, process the protrusion that swells owing to rollforming marked oblique line) swelled in rollforming processing by rollforming processing (non-cut).Therefore, (non-groove 1519) radius r 3 of concavo-convex (non-groove 1519) radius r 2 that adds the Ministry of worker 1512 and pars intermedia 1516, r4, r5 are greater than the non-concavo-convex radius r 1 that adds the Ministry of worker 1514.In addition, the degree of depth of groove 1518 is dark more, and the protuberance degree of protrusion is just big more.Therefore, concavo-convex (non-groove 1519) radius r 3, r4, the r5 that adds (non-groove 1519) radius r 2 of the Ministry of worker 1512 greater than pars intermedia 1516.
That is, pars intermedia 1516 has littler and than the non-concavo-convex big radius of radius that adds the Ministry of worker 1514 than the concavo-convex maximum radius (that is the radius of non-groove 1519) that adds the Ministry of worker 1512.
In addition, as mentioned above, in being formed at the lip-deep groove 1518 of pars intermedia 1516, the degree of depth of the concavo-convex groove 1518 that adds the Ministry of worker's 1,512 one sides that is positioned at pars intermedia 1516 is big, and it is little to be positioned at the degree of depth of the non-concavo-convex groove 1518 that adds the Ministry of worker's 1,514 one sides.And the closer to the non-concavo-convex Ministry of worker 1514 that adds, the degree of depth of groove 1518 is just more little.Therefore, the radius of pars intermedia 1516 adds the Ministry of worker's 1,512 one sides big (radius r 5) at this pars intermedia 1516 concavo-convex, and in the non-concavo-convex Ministry of worker's 1,514 one sides little (radius r 3) that add of this pars intermedia 1516.In addition, the radius of pars intermedia 1516 is from the described concavo-convex non-concavo-convex Ministry of worker's 1,514 one sides diminish gradually (radius r 5〉radius r 4〉radius r 3) that add of the Ministry of worker's 1,512 one side direction that add.
As mentioned above, in the developer roll 510 of present embodiment, the concavo-convex degree of depth that adds the groove 1518 on the Ministry of worker 1512 and the pars intermedia 1516 is different.Add man-hour when carrying out above-mentioned rollforming, can mould be pressed to the pressing force of rollforming processing developer roll not make the degree of depth difference of groove 1518 by changing (when the degree of depth that will make groove 1518 hour, can reduce pressing force, when the degree of depth that will make groove 1518 is big, can increase pressing force).
The validity of the developer of＜＜the second embodiment〉〉
As mentioned above, the developer of present embodiment has developer roll 510 and the limiting scraper 560 that is used to carry toner.Described developer roll 510 has: the concavo-convex Ministry of worker 1512 that adds, and the central portion that is located axially at developer roll 510 has carried out concavo-convex processing in order to carry toner to its surface; The non-concavo-convex Ministry of worker 1514 that adds at the both ends that are located axially at of described developer roll 510, does not carry out described concavo-convex processing to its surface; And pars intermedia 1516, add the Ministry of worker 1512 and non-concavo-convex adding between the Ministry of worker 1514 in that being located axially at of described developer roll 510 is concavo-convex, and have littler and than the non-concavo-convex big radius of radius that adds the Ministry of worker 1514 than the concavo-convex maximum radius that adds the Ministry of worker 1512.Described limiting scraper 560 from the axial end of developer roll 510 to the whole zone and developer roll 510 butts of another end, be used to limit the bed thickness that is carried on the toner on the developer roll 510.Thus, can realize limiting rightly on the developer roll 510 developing apparatus etc. of bed thickness of the toner of carrying.
Promptly, axial central portion at developer roll 510 is provided with the described concavo-convex Ministry of worker 1512 that adds, be provided with the described non-concavo-convex Ministry of worker 1514 that adds at axial both ends, limiting scraper 560 from the axial end of developer roll 510 to the whole zone and developer roll 510 butts of another end, therefore, if concavo-convexly add the Ministry of worker 1512 and there is big step in non-concavo-convex adding between the Ministry of worker 1514, then limiting scraper 560 can not with developer roll 510 butt rightly, thereby can not bring into play the above-mentioned functions of limiting scraper 560 rightly, promptly limit the function of the bed thickness of the toner of carrying on the developer roll 510.
To this, in the developing apparatus of present embodiment, owing to add the Ministry of worker 1512 and non-concavo-convex adding is provided with pars intermedia 1516 between the Ministry of worker 1514 at concavo-convex on axially of developer roll 510, this pars intermedia 1516 has littler and than the non-concavo-convex big radius of radius that adds the Ministry of worker 1514 than the concavo-convex maximum radius that adds the Ministry of worker 1512, thereby add the Ministry of worker 1512 and there is not big step in non-concavo-convex adding between the Ministry of worker 1514, thereby limiting scraper 560 and developer roll 510 butt rightly concavo-convex.Therefore, limiting scraper 560 can limit the bed thickness of the toner of carrying on the developer roll 510 more rightly.
Other embodiments of＜＜the second embodiment〉〉
In the above-described embodiment, the radius of pars intermedia 1516 adds the Ministry of worker's 1,512 one sides big (radius r 5) concavo-convex, and in the non-concavo-convex Ministry of worker's 1,514 one sides little (radius r 3) that add, but be not limited thereto.For example, in Figure 18, the size of radius r 3, radius r 4 and radius r 5 also can be identical (pass of radius r 1 and radius r 2 is: radius r 1＜radius r 3=radius r 4=radius r 5＜radius r 2).
But, from display board 560 and developer roll 510 butt more rightly, thereby limiting this point of the bed thickness of the toner of carrying on the developer roll 510 more rightly by limiting scraper 560, above-mentioned embodiment is more excellent.
In addition, in the above-described embodiment, the radius of pars intermedia 1516 adds the non-concavo-convex Ministry of worker's 1,514 one sides that add of the Ministry of worker's 1,512 one side direction from pars intermedia 1516 concavo-convex and diminishes gradually (radius r 5〉radius r 4〉radius r 3), but is not limited thereto.For example, in Figure 18, the size of radius r 3, radius r 4 also can be identical (pass of radius r 1 and radius r 2 is: radius r 1＜radius r 3=radius r 4＜radius r 5＜radius r 2).
But, from display board 560 and developer roll 510 butt more rightly, thereby limiting this point of the bed thickness of the toner of carrying on the developer roll 510 more rightly by limiting scraper 560, above-mentioned embodiment is more excellent.
In addition, in the above-described embodiment, have along the side face of developer roll 510 and with non-concavo-convex add that the Ministry of worker 1514 contacts be used to the end seal 527 that prevents that toner from leaking, and, the coating processing has been carried out on the concavo-convex surface that adds the Ministry of worker 1512, do not handle and coating is carried out on the surface of pars intermedia 1516, but be not limited thereto.For example, also can all carry out coating to the surface of concavo-convex surface that adds the Ministry of worker 1512 and pars intermedia 1516 handles.
Handle if coating is carried out on the surface of developer roll 510, then, therefore can improve the charging property of toner owing to improved the rollability of toner.But, if not only to the concavo-convex surface that adds the Ministry of worker 1512 but also described coating is carried out on the surface of pars intermedia 1516 handle, then because the improvement of described rollability, toner can move towards the non-concavo-convex Ministry of worker 1514 that adds by end seal 527 contacts (in other words, need seal toner) that are used to prevent that toner from leaking easilier.
In the above-described embodiment, owing to only in the concavo-convex surface that adds the Ministry of worker 1512 and pars intermedia 1516 the former carried out the coating processing, and being carried out coating, the latter do not handle, so can improve the charging property of toner, and can move the leakage that prevents toner rightly to the non-concavo-convex Ministry of worker 1514 that adds by suppressing toner.From this point, above-mentioned embodiment is more excellent.
In addition, in the above-described embodiment, come at the axial both ends of developer roll 510 with axially form the little groove 1518 of groove 1518 that depth ratio is formed at described axial central portion on the pars intermedia 1516 between the central portion by rollforming processing, realized having the pars intermedia 1516 of the radius littler and bigger thus, but be not limited thereto than the described non-concavo-convex radius that adds the Ministry of worker 1514 than the described concavo-convex maximum radius that adds the Ministry of worker 1512.
For example, also can be by the non-concavo-convex Ministry of worker 1514 and the pars intermedia 1516 of adding cut the pars intermedia 1516 (at this moment, also can not form groove 1518 on pars intermedia 1516) of realizing having the radius littler and bigger than the described non-concavo-convex radius that adds the Ministry of worker 1514 than the described concavo-convex maximum radius that adds the Ministry of worker 1512.
But from realizing having pars intermedia 1516 this point of the radius littler and bigger than the described non-concavo-convex radius that adds the Ministry of worker 1514 than the described concavo-convex maximum radius that adds the Ministry of worker 1512 simply, above-mentioned embodiment is more excellent.
[the 3rd embodiment]
The topology example of the developer roll 510 of the developer of＜＜the three embodiment〉〉
Here, use Figure 19 to Figure 22 to come the structure example of the developer roll 510 of developer that the 3rd embodiment is related to describe.Figure 19 is the schematic perspective view of developer roll 510, shows the mutually different spiral helicine first groove 2518a of coiling direction and the second groove 2518b.Figure 20 is the front schematic view of developer roll 510, shows the position relation of the groove formation portion 2512 and the non-groove formation portion 2514 of developer roll 510.Figure 21 is the cross sectional shape synoptic diagram of groove 2518.Figure 22 is A-A schematic cross-section of Figure 20, shows the difference of the degree of depth of the groove 2518 of the degree of depth of groove 2518 of central portion 2512a and both ends 2512b.In addition, in Figure 19 to Figure 22, be easier to understand in order to make figure, the ratio of groove 1518 grades is with actual different.In addition, figure 21 illustrates along the cross section of direction shown in the symbol X among Figure 20.
The developer roll 510 carrying toner T of the developer that the 3rd embodiment relates to also are transported to the developing location relative with photoreceptor 20 with it.This developer roll 510 is the parts that are made of aluminium alloy, ferroalloy etc.Shown in Figure 20, Figure 22 etc., developer roll 510 is according to its surperficial textural difference, mainly is divided into two parts (groove formation portion 2512, non-groove formation portion 2514).
As Figure 19, shown in Figure 20, in the present embodiment, be provided with the mutually different spiral helicine first groove 2518a of coiling direction and the second groove 2518b as groove 2518.The length direction of the first groove 2518a all is about 45 degree with the size of the described acute angle that is axially become and the length direction of the second groove 2518b with the size of the described acute angle that is axially become.In addition, be in the groove formation portion 2512 of the developer roll 510 central portion 2512a on axially and to be in the groove formation portion 2512 of this end 2512b (both ends) on axial slightly variant at aspects such as relevant grooves 2518.
As shown in figure 21, at described central portion 2512a, the degree of depth of groove 2518 is about 7 μ m.In the present embodiment, toner T is (graininess) in pelletized form, and because the volume average particle size of toner T is about 7 μ m, so the size of the volume average particle size of the degree of depth of groove 2518 and toner T about equally.At central portion 2512a, the width of groove 2518 is about 80 μ m, and groove angle (angle of representing with symbol in Figure 21) is about 90 degree.In addition, electroless plating Ni-P having been carried out on the surface of this central portion 2512a handles.
On the other hand, as shown in figure 22, at described end 2512b, the degree of depth of groove 2518 less than the degree of depth that is formed at the groove 2518 on the central portion 2512a (in Figure 22, show three grooves 2518 that are arranged on the 2512b of end for easy, but in fact be provided with groove 2518) more than three at end 2512b.In the present embodiment, the degree of depth that is formed at the groove 2518 on the 2512b of end is about about half of groove 2518 degree of depth that are formed on the central portion 2512a.In addition, 2512a is different with central portion, electroless plating Ni-P is not carried out on its surface and handles.
In addition, as mentioned above, in the developer roll 510 of present embodiment, the degree of depth of the groove 2518 on the central portion 2512a of groove formation portion 2512 and the end 2512b is different.Add man-hour when carrying out above-mentioned rollforming, can mould be pressed to the pressing force of rollforming processing developer roll not make the degree of depth difference of groove 2518 by changing (when the degree of depth that will make groove 2518 hour, can reduce pressing force, when the degree of depth that will make groove 2518 is big, can increase pressing force).
The validity of the developer that＜＜the three embodiment relates to〉〉
As mentioned above, the developing apparatus that relates to of present embodiment has developer roll 510 and the end seal 527 that is used to carry toner.Described developer roll 510 has: groove formation portion 2512, be formed with spiral helicine groove 2518 in its surface, the degree of depth of the groove 2518 on the axial end portion 2512b this groove formation portion 2512, that be formed at described developer roll 510 is less than the degree of depth that is formed at the groove 2518 on the described axial central portion 2512a; And non-groove formation portion 2514, in the described outside that is located axially at described groove formation portion 2512, be not formed with described spiral helicine groove 2518.Described end seal 527 contacts with described non-groove formation portion 2514 along the side face of described developer roll 510, is used to prevent that toner from leaking.Thus, can realize preventing rightly developing apparatus that toner leaks etc.
Promptly, in above-mentioned developing apparatus, need prevent that toner from leaking out between the side face of developer roll 510 and the shell 540 of developing apparatus etc., in order to reach this purpose, in this developing apparatus, be provided with along the side face of developer roll 510 and 2514 that contact with non-groove formation portion, be used to the end seal 527 that prevents that toner from leaking.
Yet, this end seal 527 only is set in developing apparatus, just prevent that the countermeasure that toner leaks may be abundant inadequately, also needing further, research prevents the countermeasure that toner leaks.
To this, in the present embodiment, by making the groove 2518 that is formed on the described end 2512b different in the formed spiral groove 2518 on the surface of groove formation portion 2512, realize the described countermeasure that prevents that toner from leaking with the groove 2518 on being formed at described central portion 2512a.Promptly, in this example, different with conventional example (spiral helicine groove 2518 is constant example on described central portion 2512a and described end 2512b), owing to be formed at the degree of depth of the groove 2518 on the 2512b of end less than the degree of depth that is formed at the groove 2518 on the central portion 2512a, so compare with described conventional example, being in end 2512b, to go up the quantitative change of the toner that formed groove 2518 direction inner and along groove 2518 towards non-groove formation portion 2514 moves few.Therefore, in this example, compare with conventional example, the quantitative change that arrives the toner in the end seal 527 that contacts with non-groove formation portion 2514 is few, thereby has prevented the leakage of toner rightly.
＜＜other prevent the countermeasure that toner leaks
In the above description, the following countermeasure that prevents that further toner from leaking has been described, that is: on the surface of groove formation portion 2512 in the formed spiral groove 2518, the different countermeasure of groove 2518 on making the groove 2518 that is formed on the described end 2512b and being formed at described central portion 2512a, in other words makes the countermeasure (this example) of the degree of depth of the groove 2518 that is formed on the 2512b of end less than the degree of depth that is formed at the groove 2518 on the central portion 2512a.But this example only is by the 2518 different examples that prevent that toner from leaking of the groove on making the groove 2518 that is formed on the 2512b of end and being formed at central portion 2512a, also can consider other examples.Shown in this by 2518 different other examples (first variation and second variation) that prevent the countermeasure that toner leaks of the groove on making the groove 2518 that is formed on the 2512b of end and being formed at central portion 2512a.
＜the first variation 〉
At first, use Figure 23, Figure 24 that first variation is described.Figure 23 is corresponding with Fig. 6, is the front schematic view of the developer roll 510 of first variation.The back will be described in detail Figure 24.
As shown in figure 23, in the developer roll 510 of this first variation, the length direction that is formed at the groove 2518 on the described end 2512b and the axial acute angle that becomes of developer roll 510 are greater than length direction that is formed at the groove 2518 on the described central portion 2512a and the described acute angle that is axially become.
In more detail, in the developer roll 510 of this above-mentioned example, length direction and the described acute angle that is axially become with regard to groove 2518 not there are differences between central portion 2512a and end 2512b, and the size of this acute angle is about 45 degree.In the developer roll 510 of first variation, the size of the length direction that is formed at the groove 2518 on the central portion 2512a and the described acute angle that is axially become is identical with this example to be about 45 degree, and the length direction that is formed at the groove 2518 on the 2512b of end and the size of the described acute angle that is axially become are about 60 and spend (〉 45 and spend).
Like this, bigger by the length direction that makes the groove 2518 that is formed on the 2512b of end with the described acute angle that is axially become, can prevent the leakage of toner rightly.Use Figure 24 that this point is described.Figure 24 is the key diagram that is used to illustrate the validity of first variation, shows near moving (in Figure 24, representing moving of this toner with arrow) of the toner border 2515 of non-groove formation portion 2514 and end 2512b.Example (comparative example) when there is shown described acute angle little (45 degree) on the left side of Figure 24, the example when there is shown described acute angle big (60 degree) on the right side of Figure 24 (, first variation).
The toner that end 2512b goes up in the formed groove 2518 can move along the direction of groove 2518 to non-groove formation portion 2514, but owing to be not formed with groove 2518 in non-groove formation portion 2514, so the result who moves along groove 2518 is in the groove 2518, the toners that arrive the border 2515 of non-groove formation portion 2514 and end 2512b overflow from groove 2518.So, as shown in figure 24, the toner that overflows from groove 2518 is divided into crosses the wall 2515a that is positioned at described border and to the toner of non-groove formation portion 2,514 one side shiftings, with being rebounded by described wall 2515a to the toner of end 2512b one side shifting, when more described first step variation and described comparative example, in described first variation to the amount of the toner of non-groove formation portion 2,514 one side shiftings because the difference of described acute angle, and than the amount to the toner of non-groove formation portion 2,514 one side shiftings in the described comparative example lack (opposite, in described first variation to the amount of the toner of end 2512b one side shifting than described comparative example in amount to the toner of end 2512b one side shifting many).Therefore, compare with comparative example, in first variation, the quantitative change that arrives the toner in the end seal 527 that contacts with non-groove formation portion 2514 is few, thereby has prevented the leakage of toner rightly.
In addition, as mentioned above, in the developer roll 510 of first variation, central portion 2512a and end 2512b in groove formation portion 2512, the varying in size of the axial acute angle that becomes of the length direction of groove 2518 and developer roll 510.Can by make to central portion 2512a carry out rollforming add man-hour employed mould with end 2512b is carried out rollforming and adds employed mould in man-hour (more particularly, the shape difference of sword) difference and make varying in size of described acute angle.
In addition, the same with this example, in first variation, in groove formation portion 2512, formed as spiral groove 2518, the mutually different first groove 2518a of coiling direction and the second groove 2518b, but be not limited thereto.For example, in this example or first variation, any among the first groove 2518a or the second groove 2518b can only be set also.
＜the second variation 〉
Then, use Figure 25 that second variation is described.Figure 25 is corresponding with Fig. 6, is the front schematic view of the developer roll 510 of second variation.In addition, in Figure 25, represent first trend described later with symbol d1, d2, and represent that with symbol dx1, dx2 described first moves towards d1, d2 along the axial direction of developer roll 510, represent that with symbol dy1, dy2 this first moves towards d1, d2 along the circumferential direction of developer roll 510.
As shown in figure 25, in the developer roll 510 of this second variation, described central portion 2512a formed as spiral helicine groove 2518, the mutually different described first groove 2518a of coiling direction and the second groove 2518b, and only formed some (in Figure 25 among the described first groove 2518a and the second groove 2518b at described end 2512b, with the groove 2518 that solid line is represented among the first groove 2518a and the second groove 2518b, formed on the 2512b of end, with dashed lines is represented the groove 2518 that do not form on the 2512b of end).
More particularly, when and in rightabout towards each other two trends at the length direction of formed groove 2518 on the 2512b of end, with this trend along the sense of rotation of the circumferential direction of developer roll 510 and developer roll 510 (in Figure 25, represent this sense of rotation with symbol r) consistent direction is made as first trend (in Figure 25, first trend of representing the first groove 2518a with symbol d1, first trend of representing the second groove 2518b with symbol d2) time, in the first groove 2518a and the second groove 2518b, move towards d1 with first, d2 along the axial direction of developer roll 510 with from described end 2512b towards the direction of described central portion 2512a (among Figure 25, represent this direction with symbol X1), be arranged on the 2512b of end with groove 2518 from latter's unanimity of described end 2512b in the direction (among Figure 25, representing this direction) of described non-groove formation portion 2514 with symbol X2.
More particularly, at the end 2512b that is arranged in Figure 25 left side, first of the first groove 2518a move towards d1 along described axial direction dx1 with consistent towards the direction X1 of central portion 2512a from end 2512b, and, first of the second groove 2518b move towards d2 along described axial direction dx2 with consistent towards the direction X2 of non-groove formation portion 2514 from end 2512b, therefore, the groove 2518 that satisfies above-mentioned condition is second groove 2518b.Thereby, be arranged in the second groove 2518b that has only formed the first groove 2518a and the second groove 2518b on the end 2512b in Figure 25 left side.
On the other hand, be arranged in the end 2512b on Figure 25 right side, first of the first groove 2518a move towards d1 along described axial direction dx1 with consistent towards the direction X2 of non-groove formation portion 2514 from end 2512b, and, first of the second groove 2518b move towards d2 along described axial direction dx2 with consistent towards the direction X1 of central portion 2512a from end 2512b, therefore, the groove 2518 that satisfies above-mentioned condition is first groove 2518a.Thereby, be arranged in the first groove 2518a that has only formed the first groove 2518a and the second groove 2518b on the end 2512b in Figure 25 left side.
When on the 2512b of end, as above forming groove 2518, can prevent the leakage of toner rightly.Promptly, when on the 2512b of end, be formed with do not satisfy above-mentioned condition groove 2518 (in Figure 25, be represented by dotted lines, the first groove 2518a among Figure 25 on the left end 2512b, and the second groove 2518b on the right-hand end 2512b among Figure 25) time, if developer roll 510 rotates to described sense of rotation r, then the 2512b toner gone up in the formed groove 2518 in end will move (the end 2512b in left side in Figure 25 to non-groove formation portion 2514 along groove 2518, it is opposite that the moving direction of toner and first moves towards d1, the end 2512b on right side in Figure 25, it is opposite that the moving direction of toner and second moves towards d2).
Relative therewith, when on the 2512b of end, be formed with satisfy above-mentioned condition groove 2518 (in Figure 25, represent with solid line, the first groove 2518a among the second groove 2518b among Figure 25 on the left end 2512b and Figure 25 on the right-hand end 2512b) time, if developer roll 510 rotates to described sense of rotation r, then end 2512b go up toner in the formed groove 2518 will be along groove 2518 and (promptly to the direction opposite with non-groove formation portion 2514, the direction of central portion 2512a) moves (the end 2512b in left side in Figure 25, it is opposite that the moving direction of toner and second moves towards d2, the end 2512b on right side in Figure 25, it is opposite that the moving direction of toner and first moves towards d1), therefore, the quantitative change of toner that arrives the end seal 527 that contacts with non-groove formation portion 2514 is few, thereby has prevented the leakage of toner rightly.
In addition, as mentioned above, in the developer roll 510 of second variation, on central portion 2512a, be formed with the first groove 2518a and the second groove 2518b, and in Figure 25, only be formed with the second groove 2518b on the end 2512b in left side, in Figure 25, only be formed with the first groove 2518a on the end 2512b on right side.If on central portion 2512a, form groove 2518 by two moulds, and in Figure 25, only form groove 2518 on the end 2512b in left side by a mould, in Figure 25, only form groove 2518 on the end 2512b on right side, just can realize the developer roll 510 of second variation by another mould.
Other embodiments of＜＜the three embodiment〉〉
In the above description, the coating processing has been carried out on the surface of central portion 2512a, do not handled and coating is carried out on the surface of end 2512b, but be not limited thereto.For example, also can all carry out the coating processing to the surface of central portion 2512a and the surface of end 2512b.
Handle if coating is carried out on the surface of developer roll 510, then, therefore can improve the charging property of toner owing to improved the rollability of toner.But, if not only to the surface of central portion 2512a but also this coating is carried out on the surface of end 2512b handle, then because the improvement of described rollability, toner can be easier towards moving by the non-groove formation portion 2514 that is used to prevent end seal 527 contacts (in other words, need seal) that toner leaks to toner.
In the above-described embodiment, owing to only in the surface of central portion 2512a and end 2512b the former carried out the coating processing, and being carried out coating, the latter do not handle, so can improve the charging property of toner, and can move the leakage that prevents toner rightly to the non-concavo-convex Ministry of worker 2514 that adds by suppressing toner.It seems that from this point above-mentioned embodiment is more excellent.
[the 4th embodiment]
(comprise second embodiment and the 3rd embodiment) in the above-described embodiment, end seal 527 is configured in the surface with developer roll 510 the both ends butt of groove is not set, but is not limited thereto.For example, as Figure 26, shown in Figure 27, also can be arranged to the groove formation portion butt that is formed with groove 3518 with developer roll 510.Figure 26 is near the enlarged drawing the end of the groove formation portion that relates to of the 4th embodiment.Figure 27 is the figure that the groove formation portion state of contact of the developer roll that hair yarn and the 4th embodiment relate to is shown.
In the case, end seal 527 preferably is made of fabric with the surface that groove formation portion contacts, rather than nonwoven fabrics.
In the present embodiment, end seal 527 is the parts that are made of fabric, and fabric can adopt pile.In addition, on the surface of the base fabric 527b that this pile had, be provided with the hair yarn 527a of the fluoride fiber of fluffing state, and contact with the groove portion of formation of developer roll by this hair yarn 527a.In addition, hair yarn 527a is inweaved in the bottom line of described base fabric 527b, and its density of arranging on the surface of described base fabric 527b roughly evenly (promptly, as shown in figure 27, the hair yarn 527a end 527d that is positioned at base fabric one side is positioned at a side opposite with the leading section 527c of hair yarn 527a by described base fabric 527b).And, described pile has been carried out pushing processing, thereby as shown in figure 27, hair yarn 527a being not to be erectility with respect to the surface of described bottom 527b, its leading section 527c tilts to the inboard of groove formation portion.In the present embodiment, hair yarn 527a is clipping (cutting a hair) shape, but is not limited thereto.For example, described hair yarn 527a also can be circle suede (looped pile) shape.And in the present embodiment, end seal 527 is the parts that only are made of fabric, but is not limited thereto.The end seal 527 that combines as the nonwoven fabrics of thickness adjustment component etc. also can be used according to the developer roll 510 and the space of shell 540 so long as fabric gets final product in the surface that described end seal 527 contacts with the groove formation portion of described developer roll 510 on described fabric.
The validity of the 4th embodiment then, is described.
When the end seal 527 that is made of nonwoven fabrics contacts with the groove portion of formation, because developer roll 510 slides on the surface of this end seal 527 with the state of pushing described end seal 527, thereby the mantle friction of the concavo-convex and described end seal 527 that had of described groove formation portion, thereby this lip-deep fiber is untied easily or is come off.Consequently, end seal 527 may prevent the leakage of toner T rightly.
Relative therewith, when using fabric on the surface that contacts with groove formation portion of end seal 527, owing to inweaved all fibers in this fabric, thus coming off of the fiber that causes owing to described friction can be prevented, thus end seal 527 can prevent the leakage of toner T rightly.
In the present embodiment, the fabric that groove formation end seal 527 and developer roll 510 portion contacts is a pile, is contacted with the described groove portion of formation by the hair yarn 527a that inweaves among the base fabric 527b that this pile has.At this moment, described hair yarn 527a can follow the concavo-convex of groove formation portion well and contact with this groove formation portion.In addition, also owing to little, so end seal 527 can be guaranteed sealing property under the state of the driving torque that less suppresses developer roll 510 with the contact pressure of this groove formation portion.Therefore, end seal 527 can prevent the leakage of toner more rightly.
In addition, the both ends of the developer roll 510 of described hair yarn 527a and described groove formation portion on axially contacts, this hair yarn 527a towards (that is, the leading section 527c of hair yarn 527a towards) described axial on towards the inboard.At this moment, hair yarn 527a can catch the toner T that moves to the end of described groove formation portion.This is because of relative with the leading section 527c of hair yarn 527a towards the toner T of described end, thereby toner T is easy to by the cause of this hair yarn 527a seizure.On the other hand, since the toner T that is captured by hair yarn 527a easily along hair yarn 527a towards moving, so described toner T is to returning towards the direction of described inboard.Thereby end seal 527 can prevent the leakage of toner more rightly.
[structures of image formation system etc.]
Then, come the embodiment as the image formation system of an example of present embodiment is described with reference to accompanying drawing.
Figure 28 is the key diagram that the surface structure of image formation system is shown.Image formation system 700 comprises computing machine 702, display device 704, printer 10, input media 708 and reading device 710.
In the present embodiment, computing machine 702 is contained in the mini tower casing, but is not limited thereto.Cathode-ray tube (CRT)), plasma display or liquid crystal indicator etc. display device 704 is used CRT (Cathode Ray Tube:, but be not limited thereto usually.Printer 10 uses the printer of above-mentioned explanation.In the present embodiment, input media 708 uses keyboard 708A and mouse 708B, but is not limited thereto.In the present embodiment, reading device 710 uses floppy disk drive unit 710A and CD-ROM drive unit 710B, but being not limited thereto, for example also can be the device that magneto-optic (MO:MagnetOptical) disk drive device or DVD (Digital Versatile Disk) wait other.
Figure 29 is the block diagram that the structure of image formation system shown in Figure 28 is shown.In the casing that holds computing machine 702, also be provided with external memory storages such as internal storages 802 such as RAM and harddisk driving unit 804.
In addition, described printer 10 in the above description and be connected with computing machine 702, display device 704, input media 708 and reading device 710 and the example of composing images formation system, but be not limited thereto.For example, image formation system also can be made of computing machine 702 and printer 10, and image formation system also can not have some device in display device 704, input media 708 and the reading device 710.
For example, printer also can have computing machine 702, display device 704, input media 708 and reading device 710 function separately or the part of structure.As an example, printer 10 also can be the structure that has the image processing part that carries out Flame Image Process, carries out the display part of various demonstrations and be used to load and unload the recording medium handling part etc. of recording medium, and wherein said recording medium recording has the digital camera of use shot image data.
The image formation system of Shi Xianing is better than in the past system as entire system as described above.
Claims (4)
1. developing apparatus has:
The accommodation section holds and is used for the toner-particle that develops to as the sub-image that carries on the supporting body; With
Toner-particle bearing roller has on the surface of described toner-particle with respect to axially and peripheral, oblique and the spiral helicine groove that forms equally spacedly in the axial direction being used to carry,
Described toner-particle bearing roller comprises: central portion comprises by the cave in described groove that is provided with and have protuberance with the discontiguous surface of described machining tool of machining tool; And not as the both ends of processing object,
Described developing apparatus also has layer-thickness restriction member, this layer-thickness restriction member is at whole zone and described toner-particle bearing roller butt from the described central portion of described toner-particle bearing roller to described both ends, be used to limit the bed thickness of the described toner-particle that carries on the described toner-particle bearing roller
Be formed with two kinds with respect to axially reaching the circumferential different described groove in angle of inclination.
2. developing apparatus as claimed in claim 1, wherein, the fixed distance from the end face of described protuberance to the bottom surface of described groove.
3. developing apparatus as claimed in claim 2, wherein, the distance from the end face of described protuberance to the bottom surface of described groove is below the twice of volume average particle size of described toner-particle.
4. an image processing system comprises each described developing apparatus in the claim 1 to 3.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005317377 | 2005-10-31 | ||
| JP2005317376 | 2005-10-31 | ||
| JP2005317374A JP4692223B2 (en) | 2005-10-31 | 2005-10-31 | Developing device, toner particle carrying roller, image forming apparatus, image forming system, and toner particle carrying roller manufacturing method |
| JP2005317374 | 2005-10-31 | ||
| JP2005317378 | 2005-10-31 | ||
| JP2005379774 | 2005-12-28 |
Related Child Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100060213A Division CN101482721B (en) | 2005-10-31 | 2006-10-31 | Developing device, and image forming apparatus |
| CN2009100060232A Division CN101482723B (en) | 2005-10-31 | 2006-10-31 | Developing device, and image forming apparatus |
| CN2009100060228A Division CN101482722B (en) | 2005-10-31 | 2006-10-31 | Developing device, image forming apparatus |
| CNA2009100060247A Division CN101482724A (en) | 2005-10-31 | 2006-10-31 | Developing device, toner particle carrying roller, image forming apparatus, image forming system, and method of manufacturing toner particle carrying roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1959557A CN1959557A (en) | 2007-05-09 |
| CN100524073C true CN100524073C (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100060232A Expired - Fee Related CN101482723B (en) | 2005-10-31 | 2006-10-31 | Developing device, and image forming apparatus |
| CN2009100060228A Expired - Fee Related CN101482722B (en) | 2005-10-31 | 2006-10-31 | Developing device, image forming apparatus |
| CNA2009100060247A Pending CN101482724A (en) | 2005-10-31 | 2006-10-31 | Developing device, toner particle carrying roller, image forming apparatus, image forming system, and method of manufacturing toner particle carrying roller |
| CNB200610150467XA Expired - Fee Related CN100524073C (en) | 2005-10-31 | 2006-10-31 | Developing device and image forming apparatus |
| CN2009100060213A Expired - Fee Related CN101482721B (en) | 2005-10-31 | 2006-10-31 | Developing device, and image forming apparatus |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100060232A Expired - Fee Related CN101482723B (en) | 2005-10-31 | 2006-10-31 | Developing device, and image forming apparatus |
| CN2009100060228A Expired - Fee Related CN101482722B (en) | 2005-10-31 | 2006-10-31 | Developing device, image forming apparatus |
| CNA2009100060247A Pending CN101482724A (en) | 2005-10-31 | 2006-10-31 | Developing device, toner particle carrying roller, image forming apparatus, image forming system, and method of manufacturing toner particle carrying roller |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100060213A Expired - Fee Related CN101482721B (en) | 2005-10-31 | 2006-10-31 | Developing device, and image forming apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4692223B2 (en) |
| CN (5) | CN101482723B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004417A (en) | 2005-11-02 | 2011-04-06 | 精工爱普生株式会社 | Toner-particle bearing roller and developing device |
| JP4628932B2 (en) * | 2005-11-04 | 2011-02-09 | 株式会社リコー | Image forming apparatus |
| JP4816413B2 (en) | 2006-11-07 | 2011-11-16 | セイコーエプソン株式会社 | Developing roller manufacturing method, developing device, and image forming apparatus |
| US8086152B2 (en) | 2007-05-30 | 2011-12-27 | Seiko Epson Corporation | Developing device, image forming apparatus, image forming system, developing method, and toner bearing member |
| JP4862748B2 (en) * | 2007-05-30 | 2012-01-25 | セイコーエプソン株式会社 | Developing device, image forming apparatus, and image forming system |
| JP5298820B2 (en) * | 2008-12-11 | 2013-09-25 | セイコーエプソン株式会社 | Developing roller manufacturing method, developing roller, developing device, and image forming apparatus |
| JP2010139716A (en) | 2008-12-11 | 2010-06-24 | Seiko Epson Corp | Development device and image forming apparatus |
| JP5493437B2 (en) * | 2009-04-10 | 2014-05-14 | セイコーエプソン株式会社 | A heating roller, a fixing device, an image forming apparatus, and a heating roller manufacturing method. |
| JP2010249988A (en) * | 2009-04-14 | 2010-11-04 | Seiko Epson Corp | Toner, method for forming image, and image forming apparatus |
| CN103293911B (en) * | 2012-02-23 | 2016-06-15 | 株式会社理光 | Developing unit, image processing system, and cartridge processing |
| JP6134887B2 (en) * | 2012-12-28 | 2017-05-31 | エスプリンティンソリューション株式会社 | Developing device, process cartridge, and image forming apparatus |
| EP3054183B1 (en) * | 2013-10-04 | 2020-03-25 | Susumu Shoji | Roller covered with covering comprising woven fabric, and apparatus employing same |
| CN104536277B (en) * | 2014-12-02 | 2021-07-06 | 珠海天威飞马打印耗材有限公司 | Carbon powder box and driving component thereof |
| CN108267944A (en) * | 2018-03-26 | 2018-07-10 | 珠海天威飞马打印耗材有限公司 | Drum box |
| CN110262203B (en) * | 2019-07-10 | 2023-05-05 | 珠海精通打印耗材有限公司 | Printer developing magnetic rod capable of avoiding printing ink marks from being fuzzy due to thinning of gap wheel |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4780741A (en) * | 1985-02-19 | 1988-10-25 | Kyocera Corporation | Method and apparatus for forming toner layer |
| JPH01234871A (en) * | 1988-03-16 | 1989-09-20 | Fuji Xerox Co Ltd | Developing device for image forming device |
| JPH0467182A (en) * | 1990-07-09 | 1992-03-03 | Olympus Optical Co Ltd | Roller developing device |
| DE4032469C2 (en) * | 1989-10-13 | 1994-07-28 | Ricoh Kk | Development device for developing a latent image |
| JPH05210309A (en) * | 1991-03-20 | 1993-08-20 | Olympus Optical Co Ltd | Wet developing device |
| JPH04321080A (en) * | 1991-04-19 | 1992-11-11 | Olympus Optical Co Ltd | Wet type developing device |
| JPH05100575A (en) * | 1991-10-08 | 1993-04-23 | Olympus Optical Co Ltd | Control method for liquid developing device |
| JPH05210296A (en) * | 1991-12-04 | 1993-08-20 | Ricoh Co Ltd | Developing device |
| US5387966A (en) * | 1992-05-22 | 1995-02-07 | Ricoh Company, Ltd. | Developing apparatus and method including grooved developer carrying roller |
| JPH0713410A (en) * | 1993-06-19 | 1995-01-17 | Ricoh Co Ltd | Developing device |
| JP2000242073A (en) * | 1999-02-19 | 2000-09-08 | Konica Corp | Developing device |
| US6205313B1 (en) * | 1999-11-23 | 2001-03-20 | Xerox Corporation | Toner charging system for atom imaging process |
| JP2003057940A (en) * | 2001-08-09 | 2003-02-28 | Ricoh Co Ltd | Developing device, developing method, image forming device, and developer |
| JP2003208012A (en) * | 2002-01-11 | 2003-07-25 | Ricoh Co Ltd | Image forming apparatus |
| JP2003316146A (en) * | 2002-04-24 | 2003-11-06 | Fuji Xerox Co Ltd | Developer carrier |
| JP2004020581A (en) * | 2002-06-12 | 2004-01-22 | Ricoh Co Ltd | Development apparatus, developer carrier, and image forming method and apparatus |
-
2005
- 2005-10-31 JP JP2005317374A patent/JP4692223B2/en not_active Expired - Fee Related
-
2006
- 2006-10-31 CN CN2009100060232A patent/CN101482723B/en not_active Expired - Fee Related
- 2006-10-31 CN CN2009100060228A patent/CN101482722B/en not_active Expired - Fee Related
- 2006-10-31 CN CNA2009100060247A patent/CN101482724A/en active Pending
- 2006-10-31 CN CNB200610150467XA patent/CN100524073C/en not_active Expired - Fee Related
- 2006-10-31 CN CN2009100060213A patent/CN101482721B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101482721B (en) | 2011-07-06 |
| CN101482722B (en) | 2011-11-16 |
| CN101482723B (en) | 2011-07-06 |
| CN101482723A (en) | 2009-07-15 |
| JP2007121947A (en) | 2007-05-17 |
| JP4692223B2 (en) | 2011-06-01 |
| CN1959557A (en) | 2007-05-09 |
| CN101482721A (en) | 2009-07-15 |
| CN101482724A (en) | 2009-07-15 |
| CN101482722A (en) | 2009-07-15 |
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