CN2751333Y - Display device for carrying out display operation to display electrostatic latent image in image developing position - Google Patents

Abstract

The utility model relates to a development device which is used for carrying out development operation so as to visualize an electrostatic latent image on an image visualization position, and the development device previously carries out development operation by using a development agent. The utility model comprises a placement chamber and a development agent load bearing member, wherein the placement chamber is used for placing the development agent which visualizes the electrostatic latent image, and the fluidity characteristic of the development agent is lower than that of the previously used development agent used in the previous development operation application period; the development agent load bearing member is used for supporting the development agent from the placement chamber to the image visualization position which is used for visualizing the electrostatic latent image.

Description

Carry out the video picture operation to manifest the display that the position manifests electrostatic latent image at image

Technical field

The utility model relates to and a kind ofly is used to carry out video picture operation to manifest the display that the position manifests electrostatic latent image at an image.

Background technology

Electronic photography image building mortion, be equipped with a demountable Developing box usually, colorant is housed in the Developing box, need change in case colorant is used up such as laser printer.

In more detail, Developing box can be divided into a colorant chamber and a video picture chamber.The colorant chamber is filled with colorant and comprises a stirrer.And in the video picture chamber, be provided with a feed roller and a developing roll and contact each other.In the video picture chamber, also be provided with a bed thickness adjustment sheet and contact with the surface pressure of developing roll.

In the time of on being assembled to laser printer, Developing box links to each other with the gear of laser printer to provide driving force to come each parts of transmission imaging box.When stirrer rotated, it was sent to the video picture chamber with colorant from the colorant chamber.When feed roller rotated, it was supplied to developing roll with the colorant in the video picture chamber.When colorant when feed roller is sent to developing roll, colorant is charged because of electrification by friction between feed roller and developing roll.Then, when developing roll rotated, the colorant that is supplied to the developing roll surface passed through between developing roll and layer thickness regulating blade.So just the lip-deep colorant layer of developing roll is adjusted to a fixing thickness.

Use the laser printer of Developing box comprise a photosensitive drums, photosensitive drum surface form electrostatic latent image parts, one and the transferring roller and that is oppositely arranged of photosensitive drums be used for the paper transport device of conveyance of sheets between photosensitive drums and transferring roller.

Will guarantee that developing roll is relative with photosensitive drums when in laser printer Developing box being installed, then developing roll rotates and will make its surperficial colorant relative with photosensitive drums.At this moment, colorant just moves on the electrostatic latent image that forms on the photosensitive drum surface, becomes visible colorant image thereby electrostatic latent image is manifested.The rotation of photosensitive drums should move to relative with transferring roller by visible colorant image.At this moment, paper transport device is delivered to a piece of paper between photosensitive drums and the transferring roller.The potential difference (PD) that forms between photosensitive drums and transferring roller is attracted to visible colorant image on the paper from photosensitive drums, so just can form a desired colorant image on paper.

After the colorant of Developing box is used up, laser printer will indicate colorant and use up, and supervise the user to change Developing box.The user then unloads the Developing box of using, and with a new Developing box installation in position.

Up to date, also just one abandoned it with the Developing box of crossing.Yet, by to the Developing box suplementing colorant of crossing and it is reused for the Developing box that recycles in the laser printer with sky will becomes more and more general.

The polymerization colorant of emulsion form polymerization colorant, suspension polymerization colorant and other type is being used for laser printer more and more continually.The pigment granules of polymerization colorant is close to spherical, and this and the rough shape of powdered colorant form contrast.The spheric grain of polymerization colorant makes it to have high flowability, thereby can produce the image of very high-quality.

A shortcoming of polymerization colorant is that it can leak out from Developing box at an easy rate, and this is because due to its high fluidity.For prevent that colorant from leaking between the housing of developing roll and Developing box, Developing box is equipped with seal at the axial two ends of its developing roll, and with the sliding contact of developing roll surface.Between the operating period, seal is worn at Developing box, thereby weakened them the polymerization colorant is sealed in function in the Developing box.When reusing Developing box, the new polymerization colorant that adds can be at an easy rate by the outside of the clearance leakage between seal and the developing roll to Developing box.Thereby, to the Developing box suplementing colorant time, must change seal.

In addition, enter colorant between seal and the developing roll and can be rasterized the heat of friction that produces when roller rotates and soften or melt, and when developing roll stops operating, soften or the colorant that melts cools off and solidifies.When developing roll rotated once more, the colorant of curing can be cut developing roll and seal, thereby made the very fast decline of sealing ability of seal.

And between the operating period, colorant itself also can quality descend at Developing box, and the colorant that this quality descends can cause image fog unclear (playing screen).When the Developing box suplementing colorant that a usefulness is crossed, if the wherein also residual colorants that a large amount of previous uses are arranged then when reusing this Developing box and form image, image will take place play screen.In order to prevent this problem, can be with Developing box disassemble and cleaning, removing the colorant of before having used fully, and then fill fresh colorant.Yet this pretty troublesome and increase cost.

Summary of the invention

A purpose of the present utility model provides and a kind ofly is used to carry out video picture operation to manifest the display that the position manifests electrostatic latent image at an image, described display had before used developer to carry out the video picture operation, described display comprises: one is used to hold the chamber that holds of the developer that manifests electrostatic latent image, described developer is such one type developer, it than previous video picture operational applications during the used previous developer of using have lower mobile characteristic, described mobile characteristic is represented the flowability of described developer; And a supporting manifests the developer bearing part of the developer of position from the image that holds chamber to and be used to manifest electrostatic latent image.

On the basis of above-mentioned display, the described previous developer of using is residual floating type polymerization colorant, and comprises the outer doping of the mobile characteristic that is used to increase described residual floating type polymerization colorant; The described chamber of holding holds a floating type polymerization colorant, and the quantity of the outer doping that the quantity of the outer doping that it comprises is more contained than described residual floating type polymerization colorant is lacked.

On the basis of above-mentioned display, described previous used developer is residual floating type polymerization colorant, and the described chamber of holding holds an emulsion-type polymerization colorant.

On the basis of above-mentioned display, described previous used developer is residual floating type polymerization colorant, and the described chamber of holding holds a pulverization colorant through nodularization shaping processing.

On the basis of above-mentioned display, the described previous developer of using is residual emulsion-type polymerization colorant, it comprises the outer doping of the mobile characteristic that is used to increase described residual emulsion-type polymerization colorant, the described chamber of holding holds an emulsion-type polymerization colorant, and the quantity of the outer doping that the quantity of the outer doping that it comprises is more contained than residual emulsion-type polymerization colorant is lacked.

On the basis of above-mentioned display, described previous used developer is residual emulsion-type polymerization colorant, and the described chamber of holding holds a pulverization colorant through nodularization shaping processing.

On the basis of above-mentioned display, the described chamber of holding comprises two side respect to one another, also comprises: one is used for entering from the outside and holds the chamber to add the inlet of developer to the chamber of holding, and described inlet is located on one of two side; And one is used to drive the driving mechanism of developer bearing part motion, and described driving mechanism is located on another of two side.

According to another aspect of the present utility model, provide a kind of and be used to carry out the video picture operation to manifest the display that the position manifests electrostatic latent image at an image, described display had before used developer to carry out the video picture operation, described display comprises: one is used to hold the chamber that holds of the developer that manifests electrostatic latent image, described developer is such one type developer, it has lower softening properties than the video picture used developer of operating period that had before carried out, and described softening properties is represented the softening easy degree of developer; And a supporting manifests the developer bearing part of the developer of position from the image that holds chamber to and be used to manifest electrostatic latent image.

On the basis of above-mentioned display, the described chamber of holding holds developer, and the glass transition point that it has is higher than the glass transition point of previous used developer.

On the basis of above-mentioned display, the described chamber of holding holds developer, and the average particulate diameter that it has is bigger than the average particulate diameter of previous used developer.

On the basis of above-mentioned display, described previous used developer is a coated colorant, and it is different with a shell and both thermal characteristicss that it has a kernel, and the described chamber of holding holds the developer that has the uniformity thermal characteristics inside and outside its each particle.

On the basis of above-mentioned display, the described chamber of holding comprises two side respect to one another, also comprises: one is used for entering from the outside and holds the chamber to add the inlet of developer to the chamber of holding, and described inlet is located on one of two side; And one is used to drive the driving mechanism of developer bearing part motion, and described actuator is located on another of two side.

The accompanying drawing simple declaration

The description of following each embodiment of accompanying drawings can be more clearly visible above-mentioned and other purpose, characteristics and advantage of the present utility model.Wherein:

Fig. 1 is the sectional view that a laser printer critical piece is shown, and has wherein comprised the Developing box that available the utility model method is added colorant;

Fig. 2 is the sectional view that the critical piece of laser printer Developing box shown in Figure 1 is shown;

Fig. 3 illustrates near the critical piece the interior developing roll axial end portion place's side seal of Developing box among Fig. 2; And

Fig. 4 (a) is the planimetric map of Fig. 2 Developing box;

Fig. 4 (b) is the right side view of Fig. 2 Developing box; And

Fig. 4 (c) is the left side view of Fig. 2 Developing box.

The detailed description of embodiment

Below, the laser printer 1 that is equipped with according to the Developing box 24 of the utility model first embodiment is described with reference to Fig. 1.Laser printer 1 utilizes electronic photography image formation technology to form image, and it comprises that a housing 2, a feeder part 4, image form part 5 and conveyer 41 again and again.Feeder part 4, image form part 5 and again conveyer 41 be arranged in the housing 2.Feeder part 4 forms part 5 with paper feeding to image, and it forms desired image on the paper of being supplied with 3.Conveyer 41 forms image energy on paper 3 two-sided again.

Feeder part 4 is positioned at the bottom of housing 2, is used for that paper 3 is supplied to image by a sheet conveying passage 65 and forms part 5.Feeder part 4 comprises that a sheet feed stacker 6, a paper feed mechanism 7, a pressboard 8, first transport roller 9, second and transport roller 10 and alignment roller 11.Sheet feed stacker 6 relative housings 2 are dismountable.Pressboard 8 is located in the sheet feed stacker 6.The direction that paper feed mechanism 7 transports paper with respect to feeder part 4 is provided with the downstream end of sheet feed stacker 6.Hereinafter, the direction of sheet conveying is referred to as sheet transport direction.Also have, in the narration below, when parts are said to be in " upstream " or " downstream " of another parts, refer to respect to paper between these two parts, carry along the relative position of direction.First transports roller 9 and second transports roller 10 is arranged on paper feed mechanism 7 downstreams along sheet conveying passage 65 position.Alignment roller 11 is arranged on first along sheet transport direction and transports the roller 9 and second downstream of transporting roller 10.Alignment roller 11 is used for paper 3 is carried out alignment function.

Sheet feed stacker 6 is box-like, opened upper end.One stacker can be packed in the sheet feed stacker 6 by open upper portion.Sheet feed stacker 6 can unload and install from housing 2 bottoms by horizontal slip.

Paper feed mechanism 7 comprises a paper feed roller 12 positioned opposite to each other and a separating pad 13.The rear side of separating pad 13 is provided with a spring 13a and is pressed against on the paper feed roller 12 to promote separating pad 13.

Pressboard 8 is used for that stacker 3 that is housed in sheet feed stacker 6.Pressboard 8 supported pivotly from paper feed roller 12 that end farthest, makes from nearest that end free movement vertically of paper feed roller 12.Though not shown, be provided with a spring in the rear surface of pressboard 8 with upwards pushing of pressboard 8.The thrust of these springs of the pressboard 8 resistance certain distance that pivots downwards, this distance is corresponding to the number that is stacked on paper 3 on the pressboard 8.

Adopt this layout, be pressed against paper feed roller 12 by the spring (not shown) below pressboard 8 at uppermost that paper 3 of that stacker on the pressboard 8.The rotation of paper feed roller 12 draws in uppermost that paper 3 between paper feed roller 12 and the separating pad 13 subsequently.When paper feed roller 12 further rotated, the Collaboration of paper feed roller 12 and separating pad 13 made uppermost that paper 3 separate with that stacker, and paper 3 is supplied to downstream transported roller 9 and 10.By this way, can be from sheet feed stacker 6 each downstream transport a piece of papers 3.These transport roller 9,10 and will supply the paper 3 that comes and deliver to alignment roller 11.11 pairs of paper of these alignment rollers 3 carry out alignment function, are sent to image then and form the position.It should be noted that: it is exactly that the colorant image is transferred to the transferring position on the paper 3 from photosensitive drums 23 (hereinafter will introduce) that image forms the position, just the contacted each other contact position of photosensitive drums 23 and transferring roller 25 (hereinafter will introduce).

The feeder part 4 of laser printer 1 comprises that also a multi-purpose disk 14, a multi-usage paper-feeding mechanism 15 and a multi-usage transport roller 16.Multi-usage paper-feeding mechanism 15 is used to supply the paper 3 that is stacked on the multi-purpose disk 14.

Multi-usage paper-feeding mechanism 15 comprises a multi-usage paper feed roller 15a, a multi-usage separating pad 15b and a spring 15c.Multi-usage separating pad 15b and multi-usage paper feed roller 15a are oppositely arranged, and spring 15c is arranged on multi-usage separating pad 15b downside.The thrust compressing multi-usage separating pad 15b of spring 15c is resisted against multi-usage paper feed roller 15a.

Multi-usage paper-feeding mechanism 15 is worked in the mode that is similar to paper-feeding mechanism 7, that is to say, uppermost 3 of twisting in that stacker on the multi-purpose disk 14 enters between multi-usage paper feed roller 15a and the multi-usage separating pad 15b in the rotation of multi-usage paper feed roller 15a.Then, the co-operating between multi-usage paper feed roller 15a and the multi-usage separating pad 15b is isolated a piece of paper 3 at every turn and is supplied to alignment roller 11 on that stacker.

Image forms part 5 and comprises one scan device part 17, a processing section 18 and a fixation part 19.Scanner part 17 is located at the top of housing 2, and polygon prism 20, lens 21a and the 21b and the catoptron 22 that are equipped with Laser emission part (not shown), a rotation to drive.The laser emission section branch sends a laser beam according to desired image data.Shown in the two point chain line among Fig. 1, this laser beam is reflected or transmissions by polygon prism 20, lens 21a, catoptron 22 and lens 21 successively, thereby operates the surface of the photosensitive drums 23 of treatment with irradiation part 18 with a kind of high-velocity scanning.

Processing section 18 is arranged on the below of scanner part 17, and can freely unload or load onto from housing 2.Processing section 18 comprises a Developing box 24 and a cydariform box 38.Developing box 24 can freely unload or load onto from cydariform box 38.It should be noted: Developing box 24 both can be when cydariform box 38 be installed in the housing 2, also can unload from cydariform box 38 when housing 2 unloads at cydariform box 38.

As shown in Figure 2, Developing box 24 comprises a housing 24a, a stirrer 40, a feed rolls 29, a developing roll 27, and a bed thickness adjustment sheet 28.

The housing 24a of Developing box 24 is divided into a colorant chamber 26a and a video picture chamber 26b by separates walls 24b.Colorant chamber 26a is filled with colorant positively charged, nonmagnetic, single component.Partition wall 24b between colorant chamber 26a and video picture chamber 26b is formed with a colorant and supplies with opening 39, is used for making colorant chamber 26a to be communicated with video picture chamber 26b fluid.Video picture chamber 26b holds feed rolls 29, developing roll 27 and layer thickness regulating blade 28.

Stirrer 40 comprises a turning axle 40a, a stirring vane 40b, a film spare 40c and a clearer 63.Turning axle 40a is rotatably supported in the center of colorant chamber 26a.Stirring vane 40b is along the length setting of turning axle 40a.Diaphragm 40c adheres to the free end of stirring vane 40b.Clearer 63 is arranged on turning axle 40a and goes up the other end place relative with stirring vane 40b.

Turning axle 40a is by gear mechanism 59 (a seeing below) driven in rotation.The rotation of turning axle 40a drives stirring vane 40b rotation, thereby the colorant that diaphragm 40c is scraped in the 26a of colorant chamber upwards enters video picture chamber 26b.When stirring vane 40b rotated, clearer 63 was wiped examination with colorant from those windows 62 and is fallen (hereinafter will illustrate).

Feed roller 29 is provided with colorant rotationally and supplies with below the opening 39.Feed roller 29 comprises a metal roller shaft and a sponge member, and described roll shaft is made and covered to this sponge member by the conductive sponge material.

Developing roll 27 is provided with the sidepiece of feed roller 29 rotationally.Feed roller 29 and developing roll 27 are provided with each other closely, so that both all are compressed to a certain degree.Developing roll 27 comprises a metal roller shaft and an elastic covering, and this elastic covering is made by conductive elastomer, and covers described roll shaft.This elastic covering can be become by the conductive silicon rubber (conductive silicone rubber) or the urethane rubber (urethanerubber) that are dispersed with such as carbon granule, so that it has electric conductivity.Elastic covering is coated with one deck silicon rubber or fluorine-containing urethane rubber.Developing roll 27 is applied with a predetermined video picture bias voltage, produces a potential difference (PD) with relative photosensitive drums 23.

Layer thickness regulating blade 28 is arranged on developing roll 27 tops, and contacts with developing roll 27 along the axial length of developing roll 27.Layer thickness regulating blade 28 comprises a spring part 28a, a pressing piece 28b, a back up spare 28c and a supporter 28d.Supporter 28d is connected in housing 24a.Supporter 28d is connected in spring part 28a in its lower end, is held in housing 24a thereby spring part 28a propped up.Back up spare 28c links the opposite side of the non-housing 24a of supporter 28d and spring part 28a, and produces a pressure at the back side of spring part 28a.Spring part 28a free end under it is connected in pressing piece 28b, thereby supports spring part 28a.Pressing piece 28b is made by electrically insulating silicone rubber, the cross section semicircular in shape.The elastic force of spring part 28a keeps in touch pressing piece 28 and developing roll 27.Should also be noted in that: because the pressing piece 28b of layer thickness regulating blade 28 is formed by silicon rubber, the colorant that is bearing on the developing roll 27 will be charged natch.

As shown in Figure 2, Developing box 24 is opened in that side that developing roll 27 is installed in housing 24a place.Fig. 3 shows housing 24a and the configuring condition of other parts around an axial end portion of developing roll 27, and wherein developing roll 27 has omitted so that explanation.Though Fig. 3 shows the configuration that only centers on an axial end portion of developing roll 27, the configuration that centers on two axial end portions of developing roll 27 is identical.

As shown in Figure 3, comprise sidewall 56, side shielding 58 and the downside shielding 64 of the housing 24a of housing 24a around the configuration of developing roll 27 axial end portions.Sidewall 56 comprises a sidewall 56a and a sidewall 56b.Each sidewall 56 all is formed with a supporting hole 57.They are open slots, and mutually continuous with the open side of corresponding that sidewall 56.Two supporting holes 57 are used for installing from the open side of housing 24a the roll shaft of developing roll 27.Each side shielding 58 is made of a felt spare and sticks on the sponge member, and the latter adheres to the inboard and adjacent with it of respective side walls 56.These side shieldings 58 center on two axial end leakages of developing roll 27 as seal to prevent colorant.Axially being slidably disposed in the side shielding 58 of developing roll 27 to the end.Each downside shielding 64 adheres to the inboard of each side shielding 58, and downside shielding 64 is used for preventing that to shield 58 identical modes with side colorant from leaking out from colorant chamber 26a.

Shown in Fig. 4 (a), a gear mechanism 59 is arranged on the sidewall 56a, also has colorant lid 60 to be arranged on another sidewall 56b.Gear mechanism 59 is used to drive the various parts such as developing roll 27 and stirrer 40.Colorant lid 60 is used for entering into colorant chamber 26a when it is opened.

Gear mechanism 59 comprises a holding plate 61 and a plurality of gear 59a to 59e.Holding plate 61 is supported on the sidewall 56a, and gear 59a to 59e is supported on the holding plate 61 rotationally.Shown in Fig. 4 (b), gear 59a to 59e comprises a developing roll driven wheel 59a, a feed roller driven wheel 59b, one first neutral gear 59c, one second neutral gear 59d and a stirrer-driven gear 59e.Developing roll driven wheel 59a is connected in the roll shaft of developing roll 27, and feed roller driven wheel 59b is connected in the roll shaft of feed roller 29.The first neutral gear 59c and developing roll driven wheel 59a and feed roller driven wheel 59b engagement.The second neutral gear 59d and first neutral gear 59c engagement.Stirrer-driven gear 59e and second neutral gear 59d engagement also are connected on the rotating shaft 40a of stirrer 40.

Though not shown, a motor that is used for driven wheel 59a to 59e is installed in laser printer 1.Developing box 24 is installed in the laser printer 1, and the driving force of motor is sent to the first neutral gear 59c, to rotate the first neutral gear 59c by the counter-clockwise direction of Fig. 4 (b), shown in the arrow among Fig. 4 (b).As a result, feed roller 29 and developing roll 27 are driven along the clockwise direction among Fig. 2 by developing roll driven wheel 59a and feed roller driven wheel 59b respectively and rotate.Also have, stirrer 40 is also by the second neutral gear 59d and stirrer-driven gear 59e driven in rotation.

Colorant lid 60 shown in Fig. 4 (c) is used for the opening that opening and closing are formed on sidewall 56b.When colorant lid 60 is removed, can enter colorant chamber 26a by this opening.As hereinafter describing in detail, in case the colorant of Developing box 24 is used up, any previous colorant that used, that still remain among the 26a of colorant chamber will be turned from the 26a of colorant chamber by this opening.Then, still colorant is added among the 26a of colorant chamber by the opening among the sidewall 56b.It should be noted that: so-called " colorant of before having used " referred to before colorant chamber 26a is added with fresh colorant, the colorant of being used in video picture operating period.

When stirrer 40 during as shown in Figure 2 with counter rotation, stirrer 40 is stirred in the colorant among the 26a of colorant chamber, and colorant is transported to video picture chamber 26b from colorant supply opening 39.Equally at this moment, these clearers 63 that are supported on the stirrer 40 clean the window 62 that is formed on the sidewall 56.These windows 62 are used to detect the residual volume of colorant.That is to say that window 62 makes the luminous energy from an optical sensor (not shown) pass sidewall 56.When colorant chamber 26a is full of colorant, can not pass through window 62 from the light of optical sensor.Yet, when the amount of residual colorant among the 26a of colorant chamber is reduced to when very low, just can pass window 62 from the light of optical sensor.When the light from optical sensor passed window 62, a light of this optical sensor was accepted part and is just detected light, has used up colorant thereby find out Developing box, and has been indicated by a control flow (not shown) that is located on the housing 2.

When feed roller 29 rotates, feed roller 29 will be supplied to video picture chamber 26b by the colorant that colorant is supplied with opening 39 feedings, and and then be supplied to developing roll 27.At this moment, colorant between feed roller 29 and developing roll 27 because of the electrification by friction positively charged.When developing roll 27 rotates, enter between developing roll 27 and the pressing piece 28b at the colorant on the developing roll 27, and be flattened and be the uniform skim of thickness on developing roll 27.

As shown in Figure 1, cydariform box 38 comprises transferring roller 25, photosensitive drums 23, and a SCOROTRON type charhing unit 37.Photosensitive drums 23 is arranged on the sidepiece of developing roll 27 and contact with it, and Developing box 24 is connected in cydariform box 38.Photosensitive drums 23 can be along counter rotation, shown in arrow among Fig. 1.Photosensitive drums 23 ground connection.Photosensitive drums 23 surface coverage have a photographic layer, and this photographic layer is made by polycarbonate, and have and fill positive electrical characteristics.

SCOROTRON type charhing unit 37 is located at photosensitive drums 23 tops and separates the interval of a regulation with it, so that SCOROTRON type charhing unit 37 does not contact with photosensitive drums 23.SCOROTRON type charhing unit 37 is charhing units of a positive charge SCOROTRON type, be used for from one for example the charging wire made of tungsten produce corona discharge, on the surface of photosensitive drums 23, to form the overlayer of a positive polarity electric charge.

According to desired image data, on photosensitive drums 23, form an electrostatic latent image with following method.At first, when photosensitive drums 23 was rotated, SCOROTRON type charhing unit 37 formed a positive charge overlayer on photosensitive drums 23 surfaces.Then, from the laser beam of sweep test 17 surface, at this moment,, optionally make the charging surface exposure of photosensitive drums 23 according to desired image data drive laser beam with high-velocity scanning photosensitive drums 23.The current potential of the exposed portion of charging surface descends.The zone of electronegative potential is exactly photosensitive drums 23 lip-deep electrostatic latent images.

Electrostatic latent image displays by a contrary videograph process, when developing roll 27 rotates, is bearing in colorant and photosensitive drums 23 positive contacts that positively charged is gone up on developing roll 27 surfaces that is:.At this moment, on the colorant on the developing roll 27 is supplied to electrostatic latent image on the photosensitive drums 23 of rotation.As a result, colorant optionally is bearing on the photosensitive drums 23, thereby makes electrostatic latent image form a visible colorant image.

The article that transferring roller 25 can be rotated to support on photosensitive drums 23 belows and faces with it.Transferring roller 25 is made by a metal roller shaft, is coated with a conducting rubber roller on it.For visible colorant image is transferred on the paper 3 from photosensitive drums 23, transferring roller 25 has been applied the transfer bias voltage of a regulation, so that between transferring roller 25 and photosensitive drums 23, produce a potential difference (PD).Rotate and transferring roller 25 transports a piece of paper 3 between photosensitive drums 23 and transferring roller 25 time when photosensitive drums 23, described potential difference (PD) is transferred to visible colorant image on the paper 3 from photosensitive drums 23.The paper 3 that is formed with visible colorant image on it then is transported to fixation part 19 by conveying belt 30.

Fixation part 19 is located at the downstream of processing section 18, comprises a hot-rolling 31, a pressure roller 32 and some rollers 33 that transports.Pressure roller 32 compresses hot-rolling 31.Hot-rolling 31 comprises a metal tube and a Halogen lamp LED.Halogen lamp LED is located in the metal tube with heating metal pipe.When hot-rolling 31 rotated, it was fixed the visible colorant image on the paper 3 with heat, and pressure roller 32 is transported paper 3 between hot-rolling 31 and pressure roller 32.Transport roller 33 and be located at the downstream of hot-rolling 31 and pressure roller 32.

Transport roller 34 and distributing roller 35 is located on the housing 2 rotationally, be positioned at the downstream of transporting roller 33 of fixation part 19.Transport roller 34 paper 3 is transported to distributing roller 35 from transporting roller 33.Distributing roller 35 is discharged to paper 3 the row's paper disc 36 that is arranged in housing 2 upsides then.

Laser printer 1 adopts " cleaner-less developing method ", and wherein developing roll 27 is used to be collected in visible colorant image and collects from the residual colorant of photosensitive drums 23 after photosensitive drums 23 is transferred on the paper 3.The cleaner-less developing method has reduced to collecting from the number of the required parts of remaining colorant of photosensitive drums 23.For example, do not need to provide inserted sheet or other this base part to remove residual colorant.Equally, do not need the seasoning tube to hold useless colorant yet.Thereby the configuration of laser printer can be simplified.

Delivery unit 41 comprises a reversing-gear 42, a flap valve 45 again, and transports dish 43 again and again.Reversing-gear 42 and transport dish again and 43 be integrally formed in together, and by reversing-gear 42 being linked housing 2 rear sides and will being transported dish 43 again and insert housing 2 in a position above the feed part 4 and be installed on the housing 2.

Reversing-gear (inverting mechanism) 42 comprises a housing 44, reverse rollers 46, transports a roller 47 and a reverse guide plate 48 again.When cross-sectional direction shown in Figure 1 is observed, housing 44 is basic to become rectangles.Reverse rollers 46 and transport roller 47 again and be located in the housing 44, oppositely guide plate 48 projects upwards from the top of housing 44.

Flap valve 45 is located in the laser printer 1 pivotly, is positioned to transport roller 33 downstreams and adjacent with it.Flap valve 45 is used for the carriage direction of paper 3 is selected to switch, or shown in solid line among Fig. 1 towards transporting roller 34, or as shown in phantom in Figure 2 towards reverse rollers 46.Though not shown, be provided with the orientation that a solenoid (solenoid) switches flap valve 45.

Reverse rollers 46 is located at flap valve 45 downstreams, is arranged in housing 44 tops.Reverse rollers 46 is optionally along driving forward or backwards.Reverse rollers 46 is transported paper 3 along forward rotation towards reverse guide plate 48, along backward rotation paper 3 is transported downwards from reverse guide plate 48 then.

Oppositely guide plate 48 is made of a panel-like member, and it is extended upward by housing 44 upper ends, in order to the paper that guides reverse rollers 46 upwards to transport.

Transport again roller 47 almost be directly arranged in reverse rollers 46 below, in the future the paper 3 of self-reversal roller 46 is transported to and transports dish 43 again.

When will when paper 3 tow sides all form image, at first making the energising of solenoid (not shown) that flap valve 45 is switched to guiding paper 3 and form the position of part 5 towards reverse rollers 46 from image.As a result, form part 5 after the one side of paper 3 forms image at image, guiding paper 3 enters reversing-gear 42 from transporting roller 33.At this moment, reverse rollers 46 forward rotation, when the paper of receiving 3 arrived at reverse rollers 46, paper 3 was clipped between two reverse rollers 46, and along with reverse guide plate 48 upwards transports.When only being had rearward end to be clipped between two reverse rollers 46 in case the major part of paper 3 upwards sends housing 44, reverse rollers 46 stops forward rotation and begins backward rotation.As a result, the upper and lower surface reciprocity of paper 3 is also almost directly down transported back and is transported roller 47 again.Transport again roller 47 with paper 3 be transported to transport again the dish 43.

Be provided with a paper in fixation part 19 downstreams by sensor 70.Reverse rollers 46 from forward rotation switch to counter-rotational timing controlled for the back edge that detects paper 3 by sensor 70 at paper after through a preset time length that constantly.In addition, in case paper 3 is transported to reverse rollers 46, then flap valve 45 switches to its initial position, that is, get back to paper is delivered to the position of transporting roller 34 from transporting roller 33.

Transport dish 43 again and comprise a paper-supply section 49,50, two groups of cross rolls of dish (oblique rollers) 51, and transport passage 53 again and again.Paper-supply section 49 comprises that an arc leads paper spare 52, and in rear end that reversing-gear can be linked to demolition housing 2 42 times.

Dish 50 is plates of a substantial rectangular, is positioned at sheet feed stacker 6 top approximate horizontal orientations.Coiling 50 upstream extremities is the extendible portions of leading paper spare 52.

Two groups of cross rolls 51 separate a predetermined interval along dish 50 settings and along the direction that paper 3 transports.Though not shown, be provided with a reference plate along a width edge of coiling 50.Every group of cross roll 51 comprises an oblique driven roller 54 and an oblique driven voller 55.Every oblique driven roller 54 is positioned near the reference plate (not shown), and tiltedly the pivot center of driven roller 54 imaginations extends along the direction that is basically perpendicular to the direction of transporting paper 3.Every oblique driven voller 55 is oppositely arranged with corresponding tiltedly driven roller 54, is transported so that paper 3 is in the state that is clipped between them.The pivot center that every oblique driven voller 55 is arranged to make its imagination is to become an oblique line to extend with the vertical substantially direction of paper 3 carriage directions.Because the tilted alignment of oblique driven voller 55, paper 3 tendencies of transporting by cross roll 51 move towards the reference plate (not shown).

The upstream extremity that transports passage 53 again and again continues mutually with the downstream end of dish 50.In addition, the downstream end of transporting passage 53 again links to each other with the center section of fortune paper passage 65.

Lead paper spare 52 guiding from reversing-gear 42 transport again that every paper paper 3 that roller 47 is transported to paper-supply section 49 substantially vertically downward enters the orientation of a basic horizontal and along the direction of dish 50.Cross roll 51 transports paper 3 along dish 50, makes the width edge of paper 3 be resisted against reference plate simultaneously, transports roller 10 by transporting passage 53 again to second then.Then, second transport roller 10 and form the position towards the image between the photosensitive drums 23 of transferring roller 25 and cydariform box 38 once more and transport paper 3.At this moment, compare paper 3 is an anti-face (upper and lower surface reciprocity) with on paper 3, forming for the first time image.Therefore, a visible colorant image is transferred on one side paper 3, opposite with last time forming image from photosensitive drums 23.Next, fixation part 19 is fixed on visible colorant image on the paper 3, at this moment, all is formed with at its tow sides on paper 3 row's of being discharged to paper discs 36 of image.

When Developing box 24 is used up colorant, it is added colorant again and reuses, and not only change and abandon it.Should note, in the narration hereinafter, Developing box 24 " reusing " meaning is to be contained in the laser printer 1 during formerly video picture manipulates at Developing box 24, wherein most of or reuse this Developing box 24 after all colorants have been used up and operate in video picture.

Below with a kind of method that Developing box 24 is added colorant of narration.Before Developing box 24 is added material, must determine to make an addition to during Developing box 24 video picture is formerly manipulated the type of the colorant among the 26a of colorant chamber.This can be by inquiry in specific model Developing box 24 type of used colorant realize.

In this example, confirmablely be: during video picture was formerly manipulated, what adorn among the colorant chamber 26a of Developing box 24 was the floating type polymerization colorant with following character.Floating type polymerization colorant is a type of polymerization colorant, has the particle that is essentially spherical, thereby has splendid flowability.

In order to produce floating type polymerization colorant, can or be dispersed in the polymerisation medium polymerization single polymerization monomer dissolving, and add polymerization initiator (polymerization initiator) and colorant, for example carbon black.Also can add crosslinking chemical, charge control agent or some other adjuvant on demand.The example of polymerization single polymerization monomer comprises styrene type monomer or acrylic type monomer.An example of styrene type monomer is a styrene.The example of acrylic type monomer is acrylic acid, alkyl (C1-C4) acrylate, alkyl (C1-C4) methacrylate.When a kind of aqueous phase stirs and disperses this potpourri, the floating type polymerization has just been finished, and produces about 6 to the 10 microns floating type polymerization colorant of average particulate diameter.

The mobile characteristic of floating type polymerization colorant is about 90 or higher.The value that mobile characteristic is to use a kind of powder tester PTR of being produced by HosokawaMicron Group to record.Powder tester PTR comprises three kinds of screen gradings, and each screen grading has a different mesh size.The first screen grading mesh size is 150 microns; The second screen grading mesh size is 75 microns; The 3rd screen grading mesh size is 45 microns.For measuring mobile characteristic, 4 gram colorants are added to first screen grading of tester PTR.Then, to three all screen gradings of tester apply a fixing vibration with one regular time length, 15 seconds for example.Then the colorant that remains in each screen grading is weighed, and calculates mobile with following formula:

Mobile characteristic=X1 * X2 * X3

In the formula, X1=remains in colorant weight/4 grams * 100 on first screen grading,

X2=remains in colorant weight/4 grams * 100 * 3/5 on second screen grading,

X3=remains in colorant weight/4 grams * 100 * 1/5 on the 3rd screen grading.

Be noted that the increase along with outside additive coated rate, mobile characteristic is tended to improve, and this point can be learnt from " collection of thesis that the 39th powder science and technical discussion can propose " the 109th page to 113 pages announcement.The 39th powder science and technical discussion can be to hold at Hiroshima,Japan November 11 to 17 calendar year 2001.In this example, the floating type polymerization colorant that makes an addition to during the video picture operational applications formerly in the Developing box 24 comprises that also outer doping is to increase the mobile characteristic of colorant.Outer doping is a kind of powder with particle size littler than basic pigment granules, and with coverage rate 60% to the 120% topped firmly basic pigment granules of floating type polymerization colorant.The example of outer doping comprises silica, titanium dioxide and aluminium oxide.

When laser printer 1 indicates Developing box 24 when having used up colorant, the user unloads the Developing box of using 24 from laser printer 1.After having determined that remaining in the colorant type of before having used among the 26a of colorant chamber from previous video picture operational applications is floating type polymerization colorant, so the user can specify the colorant that will be used to add colorant chamber 26a.According to first embodiment, the colorant of interpolation should have the mobile characteristic lower than the colorant of previous use.In this example, also the colorant of expectation interpolation has the higher flow characteristics of pulverization colorant that is shaped and handles through nodularization than not.The pulverization colorant of handling through the nodularization shaping will be called the pulverization colorant that nodularization is shaped hereinafter.The flow characteristics from 60 to 85 of the colorant that also wish to add, preferably from 70 to 80.

In this example, the user specifies one of following colorant to replace being used for during formerly the video picture operational applications suspension polymerization colorant of Developing box 24, that is: Developing box 24 can add a kind of floating type polymerization colorant that contains a small amount of outer doping, and wherein the amount of this outer doping amount that is included in the outer doping of the floating type polymerization colorant that is used for Developing box 24 during than video picture operational applications is formerly lacked.Perhaps, can charge into emulsion form polymerization colorant in the Developing box 24.In addition, Developing box 24 can also fill the pulverization colorant that is shaped with nodularization.

Because in this example, the residual floating type polymerization colorant of previous video picture operational applications has outer doping coverage rate 60% to 120%, and an example that comprises the floating type polymerization colorant of the outer doping of less amount is that a kind of to have outer doping coverage rate be 20% to 50% colorant.In addition, the floating type polymerization colorant that comprises the outer doping of this coverage rate has flow characteristics 75 to 85, above having dropped within said desired 60 to 85 the scope.

The emulsion-type polymerization colorant is the polymerization colorant of another kind of type.The particle of emulsion-type polymerization colorant has selectable shape, and is promptly spherical to irregularly shaped from being close to.The emulsion-type polymerization colorant is by dissolving in a kind of polymerisation medium or disperse above-mentioned polymerization single polymerization monomer to produce, and adds polymerization initiator, colorant therein simultaneously, and adds crosslinking chemical, charge control agent or some its adjuvant as required.Then, this potpourri is stirred, comprise emulsification in the aqueous environment of surfactant one.About 6 to 10 microns of the average particle size particle size of emulsion-type polymerization colorant.In the identical mode of introducing with the front of floating type polymerization colorant from previous video picture operational applications of being used for, the emulsion-type polymerization colorant comprises the above-mentioned outer doping to the colorant core granule, to improve flow characteristics.As for floating type polymerization colorant, add in the emulsion-type polymerization colorant outer doping to coverage rate to produce 60% to 120% from previous video picture operational applications.Emulsion-type polymerization colorant in this example has from 70 to 85 flow characteristics.

The colorant of nodularization pulverization is a kind of colorant with irregularly shaped particles, but has than better not mobile through the pulverization colorant of nodularization shaping processing.Hereinafter, the pulverization colorant of not handling through the nodularization shaping will be referred to as the pulverization colorant that not nodularization is shaped.For the pulverization colorant that will the production nodularization be shaped, at first, be distributed in the whole binder resin until colorant and go, to obtain the pulverization colorant that non-nodularization is shaped by will the colorant such as carbon black being added in the binder resin and integrating binder resin.Binder resin can be made by natural resin or synthetic resin.In case solidify, just to this potpourri pulverize with sorting to form the pulverization colorant.The machinery that the colorant of pulverization is produced with Hosogawa Micron Group then merges machine (Mechanofusion) AMS and carries out nodularization shaping processing, to obtain the pulverization colorant that nodularization is shaped.In this case, about 6 to 10 microns of the average particulate diameter that the pulverization colorant that nodularization is shaped has, and 60 to 70 flow characteristics.Instead, also can make the pulverization colorant stand the nodularization shaping with hot-working handles.In this case, about 6 to 10 microns of the average particulate diameter that the pulverization colorant that the nodularization that is produced is shaped has, flow characteristics from 70 to 80.

In case determine to add the type of colorant, the user can open colorant lid 60, to enter colorant chamber 26a by the opening among the sidewall 56b, and colorant chamber 26a carried out simple cleaning, be that the user takes out the colorant of before having used in the 26a of colorant chamber, residual 1.2 gram per centimeters of every axial length of developing roll 27 or still less in the 26a of colorant chamber are preferably till 0.7 gram per centimeter or the colorant still less.

Next, by the opening in sidewall 56b Developing box 24 is added one of above-mentioned colorant.At this moment, should to be that Developing box 24 is previous use 8 times of the colorant residual quantities or more to the amount of adding colorant.Build colorant lid 60 then with the opening closure, add operation thereby finish colorant.Developing box 24 by above-mentioned added colorant after, Developing box 24 reinstalled laser printer 1 and is used for carrying out video picture again handle.

During the previous video picture operational applications of Developing box 24, when developing roll 27 rotations, developing roll 27 is sliding to support side seal 58 and friction with it.This causes side seal 58 wearing and tearing that its sealing property is descended.If Developing box 24 adds be with the previous video picture operational applications of Developing box 24 during the colorant of used same kind, then colorant will be from leaking between side seal 58 and the developing roll 27.Thereby, being reused for subsequently video picture when operation at Developing box 24, colorant will spill outside the Developing box 24.

Yet, when Developing box 24 interpolations have the colorant of aforesaid low flow characteristics, just can prevent this leakage.In addition, just enough to the easy clean of Developing box 24.Side seal 58 does not need to change, and just can exempt so change the trouble and the expense of side seal 58.

Because the side relative that colorant lid 60 is arranged on housing 24a, so the colorant of before having used just can be by such as rocking and aspirating Developing box 24 and removed and the gear mechanism 59 of can not making dirty with gear mechanism 59.In addition, can to Developing box 24 add the material and can the dirty gear mechanism 59 of type.Therefore, when reusing Developing box 24 after the 26a of material-containing chamber adds colorant, developing roll 27, feed roller 29 and stirrer 40 all will be worked reliably.

In addition, because the colorant that will before use takes out from the 26a of colorant chamber, residual 1.2 gram per centimeters of every axial length of developing roll 27 or still less, preferably 0.7 gram per centimeter or colorant still less play a screen phenomenon and just can prevent in the 26a of colorant chamber.That is to say,, and when having the colorant of a large amount of previous video picture operational applications residual simultaneously, then when reusing developing roll 27 formation images, image will take place play the screen phenomenon if give the Developing box use 24 interpolation colorants.Yet, because the colorant that will before use takes out from the 26a of colorant chamber, residual 1.2 gram per centimeters of every axial length of developing roll 27 or still less in the 26a of colorant chamber, preferably 0.7 gram per centimeter or colorant still less, so, even add colorant when during Developing box 24 previous application, still remaining in the Developing box 24, also can prevent from when Developing box 24 is reused the formation image, to have produced the screen phenomenon, thereby realize that during Developing box 24 is reused correct image forms with the colorant of crossing.In addition, because this method allows that some colorant of previous video picture operational applications is residual, just do not need disassemble and cleaning Developing box 24 to remove the colorant of before having used fully.Therefore the interpolation of colorant operation can make things convenient for and carry out efficiently, and expense also can reduce.

In addition since the amount of the colorant that adds to be Developing box 24 previous uses 8 times of residual colorant amount or more, image plays the screen phenomenon and can prevent more reliably during image forms.

Because the polymerization colorant has excellent flowing, so can easily it be moved to desired quantity, for example, can colorant be shaken out from the opening of sidewall 56b by rocking.Therefore, can prevent at an easy rate that the generation image plays screen during reusing Developing box 24 to form image.Also have, by adding to Developing box 24, because the good flow characteristics of polymerization colorant can form high-quality image with the polymerization colorant.Thereby can prevent that during reusing Developing box 24 image from playing screen and forming high-quality image.

Do some and tested the degree that when the colorant of using because of Developing box 24 is previous varying number residual and before having used, plays screen of checking.Table 1 shows result of experiment, and these are tested used Developing box 24 and respectively comprise a colorant chamber 26a, and it is 221.0 millimeters at developing roll 27 axial lengths, and has 3,787.9 square millimeters of average cross-sectional areas (along the axial length of developing roll 27).Developing box 24 at first is used for the video picture operation under news, till colorant is used up.Then, the colorant before used is taken out, reach the value shown in the table 1 up to the amount of remaining every centimetre gram number (along the length of colorant chamber 24a).Then, the method for saying by the front adds 190 gram colorants for Developing box 24.In each test, before used 8 times of amount of colorant or more colorant to add in the developing roll 24 this.Reload Developing box 24 in the laser printer 1 then and print evaluation.

Table 1

Per unit length residual quantity (gram per centimeter)	0.7	1.2	1.6	2.1
					Play the screen evaluation	A	B	C	D

A: do not have colorant to remain on the photosensitive drums, so image has good quality.

B: have some colorants to remain on the photosensitive drums, but on the image of printing, do not see.

C: have considerable colorant to remain on the photosensitive drums, on the image of printing slight as seen.

D: colorant remains on the photosensitive drums, and can see on the image of printing.

It should be noted that: the evaluation in the table 1 is that the quality of image by the surface of observing photosensitive drums 23 and a piece of paper 3 that prints draws after feeding in raw material again.Also have, because used Developing box 24 has size mentioned above in these experiments, so 0.7 gram per centimeter (along the length of colorant chamber 24a) equals the previous colorant of using about 15.47 grams, and 1.2 gram per centimeters (along the length of colorant chamber 24a) equal the colorant that about 26.52 grams had before been used.For the colorant (190 gram) that holds the previous residue colorant of using (15.47 gram) and add again, colorant chamber 24a needs to hold 205.47 grams or more colorant.The density of sieving (in the density under intact sieve situation) of supposing colorant is 0.5 gram/cubic centimetre, and then the 24a colorant that need have about 411 cubic centimetres (205.47/0.5=411 cubic centimetres) in colorant chamber holds ability.

From table 1, be appreciated that by from the inner colorant of before having used that takes out of colorant chamber 26a residual 1.2 gram per centimeters of every axial length of developing roll 27 or still less, preferably 0.7 gram per centimeter or colorant still less just can prevent the screen phenomenon in the 26a of colorant chamber.

What should be noted that is, can hold before chamber 26a adds colorant, with a new developing roll 27 ' the replace developing roll of using 27.Unload from support holes 57 by two axial ends, just can will remove with the developing roll of crossing 27 easily developing roll 27.Then with new developing roll 27 ' two axial ends aim at support holes 57, and with new developing roll 27 ' move to the position that offsets with side seal 58 along the flute profile of support holes 57.Requiring with new developing roll 27 ' replacings developing roll 27 is because can guarantee like this to carry out subsequently video picture operating period at the colorant that uses interpolation, the colorant of interpolation can be transported on the photosensitive drums 23 suitably.The follow-up video picture operation of being undertaken by Developing box 24 will produce high-quality image.

Before changing the developing roll 27 use, require to measure its colorant bearing capacity, and new have than the developing roll 27 that hangs down the colorant load-bearing capacity ' replace it with one.The colorant load-bearing capacity is represented the amount of the colorant that a developing roll per unit surface area can carry, and represents (M/A) with the mass M of this developing roll per unit colorant bearing surface area A supporting colorant.Because new developing roll 27 ' have a colorant load-bearing capacity lower, so it carries still less colorant (M/A) than the developing roll 27 per unit surface areas of using than the developing roll use 27.Therefore, when Developing box 24 is reused, can prevent that colorant from leaking between side seal 58 and developing roll 27 from Developing box 24.

Now, have two new developing rolls 27 ' example, they have the colorant load-bearing capacity lower than the developing roll used 27.In first example, developing roll 27 ' have the lower surfaceness of surfaceness than the developing roll of using 27.More particularly, developing roll 27 has 5 to 7 microns surfaceness (10 mean roughness Rz), 2 to 3 microns surfaceness (10 mean roughness Rz) of and new developing roll 27 ' have.In second example, the surface that new developing roll 27 ' have is harder than developing roll 27.More particularly, developing roll 27 has the hardness (Japanese Industrial Standards A) of 30 degree to 50 degree, and developing roll 27 ' have 50 to spend or higher hardness.

Also have, before changing developing roll 27, require to measure the external diameter of developing roll 27, and specify another root to have the developing roll 27 of bigger external diameter ".Then with developing roll 27 with bigger external diameter " replacing developing roll 27.In first embodiment, developing roll 27 has 20.0 millimeters of external diameters, and new larger-diameter developing roll 27 " have 20.2 to 20.4 millimeters of external diameters.When with new larger-diameter developing roll 27 " when changing developing roll 27, new developing roll 27 " support parts on every side with bigger defeating.New developing roll 27 " bigger pressure compress side seal 58 and can prevent that colorant is at developing roll 27 " and side seal 58 between leak.Equally, developing roll 27 " the pressing piece 28b that compresses layer thickness regulating blade 28 with bigger pressure can reduce developing roll 27 " the developer mass M of per unit surface area A, promptly reduce (M/A).As a result, during reusing Developing box 24, can prevent suitably that colorant is by leaking in the Developing box 24.

The pulverization colorant that non-nodularization is shaped also has the mobile characteristic lower than floating type polymerization colorant.Thereby, as adding the colorant that before fills with in the Developing box 24 of floating type polymerization colorant to, just can in video picture operational applications subsequently, prevent that colorant from leaking by selected pulverization colorant from Developing box 24.Yet the lazy flow characteristic of pulverization colorant is unfavorable for the quality of image.

Therefore, as aforementioned, require Developing box 24 to fill and be higher than the colorant of pulverization colorant to have mobile characteristic, perhaps more particularly, fill with the colorant of mobile characteristic between 60 and 85, be included in the pulverization colorant that a kind of floating type polymerization colorant, a kind of emulsion-type polymerization colorant or a kind of nodularization that the amount of the outer doping in the floating type polymerization colorant that is used for Developing box 24 lacks are shaped during than previous video picture operational applications such as the amount that comprises external additive.Their mobile characteristic is not high especially, thereby can prevent colorant from leaking between side seal 58 and the developing roll 27, even side seal 58 is not given replacing adding operating period.So, when Developing box 24 reuses, can prevent that colorant from leaking into outside the Developing box 24.In addition, because colorant has the better mobile characteristic of pulverization colorant that is shaped than non-nodularization, thereby can obtain the good quality of image.

Also have, as mentioned above, the developing roll 27 of laser printer 1 adopts does not have the cleaning developing method.This cleaner-less developing method only is only effectively when a small amount of colorant is stayed on the photosensitive drums 23.That is to say, after image transfer, if there are a large amount of colorants to stay on the photosensitive drums 23, just then developing roll 27 can not suitably clean photosensitive drums 23.

Yet, when if the colorant that adds has the bigger mobile characteristic of the mobile characteristic of the pulverization colorant that is shaped than nodularization not, so just have only a spot of colorant can stay on the photosensitive drums 23, even thereby during reusing Developing box 24, also can realize suitable cleaner-less video picture.

Also carried out some and tested and be determined at when using floating type polymerization colorant during the previous video picture operational applications of Developing box 24, be used for adding the applicability of the various colorants of material to Developing box 24.Before the experiment, the Developing box 24 that fills with floating type polymerization colorant is used for the video picture operation, till colorant is used up.The outer doping coverage rate of filling this floating type polymerization colorant in Developing box 24 is 90%, and mobile characteristic is 95.Then, Developing box 24 fills with one of seven kinds of dissimilar colorants shown in the table 2.The laser printer 1 of then Developing box 24 being packed into, and utilize 5% print capacity of printer 1 to reuse described Developing box 24 on 6000 paper, to form image.This experiment repeats 10 times every kind of dissimilar colorant, and reuses a different Developing box 24 at every turn.That is to say that every kind of colorant type has 10 different Developing boxs 24, always has 70 Developing boxs 24.Judge the applicability of these different colorants according to the leakage rate of the colorant that observes.Result of experiment is shown in table 2.In the table 2, the number of defective unit refers to the number that shows colorant leakage or image distortion in 10 Developing boxs being tested.

Table 2

The colorant type	A	B	C	D	E	F	G
								Characteristics	90% coverage rate	40% coverage rate	90% coverage rate	45% coverage rate	Thermal treatment	The machinery fusion treatment	Do not have
Mobile characteristic	95	85	83	73	76	64	50
								Defective unit number	3	1	1	0	0	0	10
Estimate	Difference 1	Good 2	Good 2	Good 3	Good 3	Good 4	Difference 5

A: floating type polymerization colorant (having higher outer doping coverage rate).

B: floating type polymerization colorant (having lower outer doping coverage rate).

C: emulsion-type polymerization colorant (having higher outer doping coverage rate).

D: emulsion-type polymerization colorant (having lower outer doping coverage rate).

E: pulverization colorant (changing into shape) through hot-bulb.

F: pulverization colorant (merging nodularization through machinery is shaped).

G: pulverization colorant (not nodularization shaping).

There have 3 leakages to surpass in 1:10 the Developing box to be normal.Leakage rate is very little so that can reuse Developing box, but this colorant is not ideal as the colorant that adds usefulness.

There have a leakage to surpass in 2:10 the Developing box to be correct.Only there is a spot of colorant to leak, is not enough to stop the use of this Developing box.

3: several no colorants leak.

4: image has slight distortion, uses but be not enough to hinder.

5: image obviously distorts after about 3000 paper.After this abnormal too serious consequently can not the continuation used.

As shown in table 2, fill with previous video picture operational applications in 10 Developing boxs 24 of identical floating type polymerization colorant 3 present and close 24 more substantial colorants than new colorant and leak.

On the other hand, when the mobile characteristic of the colorant that adds during than preceding once used colorant low, have only the colorant of pettiness to leak from Developing box 24, the colorant that is leaked is identical during quantitatively substantially with new Developing box 24 of use.Yet, should be pointed out that when the pulverization colorant that uses not nodularization to be shaped when adding colorant, the vertical row of the image that laser printer 1 is got can distort, and has 10 to be not always the case in 10 Developing boxs 24.Therefore can determine: the colorant of nodularization shaping should not used as adding colorant.

It should be noted that: the pressing piece 28b of the bed thickness adjustable plate 28 of Developing box 24 is made as glue by silicon, so be easy to be worn because of scraping.Thereby when the pulverization colorant of not nodularization shaping was used as the interpolation colorant, the durability of bed thickness adjustable plate 28 had just greatly descended.Various interpolation colorants according to first embodiment have the mobile characteristic bigger than pulverization colorant.Thereby the scraping degree that bed thickness adjustable plate 28 is subjected to is lower, can keep the quality of image during Developing box 24 reuses.

Introduce above add the material method be hypothesis Developing box 24 colorant chamber 26a fills during the previous video picture operational applications of Developing box 24 is floating type polymerization colorant.Below, will introduce the example that another adds operation, wherein, in the video picture operational applications formerly, the emulsion-type polymerization colorant that holds in the colorant chamber 26.More particularly, in the previous video picture operational applications of Developing box 24, its coverage rate of outer doping that used emulsion-type polymerization colorant comprises is 60% to 120%, and the mobile characteristic that is produced is 70 to 80.

Therefore, the colorant of interpolation should have the mobile characteristic lower than the mobile characteristic of this emulsion-type polymerization colorant.As in first example, the mobile characteristic that also requires to add colorant is higher than the pulverization colorant that not nodularization is shaped.Therefore, require to add colorant and have mobile characteristic from 60 to 80, and preferably from 65 to 75, decide on the concrete mobile characteristic of previous application colorant.

For example, adding colorant can be a kind of emulsion-type polymerization colorant, and the amount of the outer doping that the amount of the outer doping that it comprises is comprised than emulsion-type polymerization colorant used in the Developing box during the video picture operational applications formerly 24 still less.More particularly, adding colorant can be a kind of emulsion-type polymerization colorant, and the coverage rate of its outer doping is 20% to 50%.When doping realized this coverage rate outside adding, the mobile characteristic of this emulsion-type polymerization colorant was 70 to 80.

As selection, adding colorant also can be the pulverization colorant that a kind of nodularization is shaped.As mentioned above, the pulverization colorant of nodularization shaping can be produced by making a kind of pulverization colorant carry out nodularization shaping processing by the machinery fusion machine AMS (Mechanofusion AMS) that is produced by Hosogawa Micron Group.In this case, the average particulate diameter of the pulverization colorant that nodularization is shaped is about 6 to 10 microns, and mobile characteristic is 60 to 70.Perhaps, also can obtain the pulverization colorant that nodularization is shaped by the pulverization colorant is heat-treated.In this case, the average particulate diameter of the pulverization colorant that nodularization is shaped is about 6 to 10 microns, and mobile characteristic is 70 to 80.

As mentioned above, the mobile characteristic that comprises the pulverization colorant that the emulsion-type polymerization colorant of doping outside the lesser amt (20% to 50%) and nodularization be shaped is in 60 to 80 scope, and this value is lower than the mobile characteristic of filling the emulsion-type polymerization colorant in Developing box 24 during the video picture operational applications formerly.Therefore, this interpolation colorant can not leak out from Developing box 24, is like this even side seal 58 is got off from previous video picture operational applications along bag yet.In addition, because colorant has the better mobile characteristic of pulverization colorant that is shaped than nodularization not, so can obtain the good quality of image.

Carried out some and tested to determine that it wherein was the applicability of the Developing box 24 of emulsion-type polymerization colorant that various colorants are used for during the previous video picture operational applications of filling.Before the experiment, the Developing box 24 that is filled with the emulsion-type polymerization colorant is used to the video picture operation, uses up until colorant.The coverage rate of filling the outer doping of this emulsion-type polymerization colorant in Developing box 24 is 90%, and mobile characteristic is 83.Then, Developing box 24 is added one of 5 kinds of dissimilar colorants shown in the table 3.The laser printer 1 of then Developing box 24 being packed into, and utilize 5% print capacity of printer 1 to reuse described Developing box 24 on 6000 paper, to form image.This experiment repeats 10 times every kind of dissimilar colorant, and reuses a different Developing box 24 at every turn.That is to say that every kind of colorant type has 10 different Developing boxs 24, always has 50 Developing boxs 24.Judge the applicability of these different colorants according to the leakage rate of the colorant that observes.Result of experiment is shown in table 3.In the table 3, the number of defective unit refers to the number that shows colorant leakage or image distortion in 10 Developing boxs being tested.

Table 3

The colorant type	A	B	C	D	E
						Characteristics	90% coverage rate	45% coverage rate	Thermal treatment	Machinery fusion treatment (Mechanofusion Proc.)	Do not have
Mobile characteristic	83	73	76	64	50
						Defective unit number	3	1	0	0	10
Estimate	Differ from 1	2	3	4	Differ from 5

A: emulsion-type polymerization colorant (higher outer doping coverage rate).

B: emulsion-type polymerization colorant (lower outer doping coverage rate).

C: the pulverization colorant that changes into shape through hot-bulb.

D: merge the pulverization colorant that nodularization is shaped through machinery.

E: pulverization colorant (not nodularization shaping).

There have 3 leakages to surpass in 1:10 the Developing box to be normal.Leakage rate is very little so that can reuse these Developing boxs, but this colorant is not suitable for reusing of Developing box.

There have 1 leakage to surpass in 2:10 the Developing box to be normal.Only there is a spot of colorant to leak, is not enough to stop the use of this Developing box.

3: several no colorants leak.

4: image has slight distortion, uses but be not enough to hinder.

5: image obviously distorts after about 3000 paper.After this distortion is too serious so that can not continue use.

As shown in table 3, the new Developing box 24 that 3 leakage rates used same kind colorant when filling with video picture operational applications is formerly arranged in 10 Developing boxs 24, additivated coverage rate was 90% beyond just Developing box filled, mobile characteristic is 83 emulsion-type polymerization colorant.

On the other hand, when the mobile characteristic of the colorant that adds during than preceding once used colorant low, have only the colorant of pettiness to leak from Developing box 24, the colorant that is leaked is identical during quantitatively substantially with new Developing box 24 of use.Yet, should be pointed out that when the pulverization colorant that uses not nodularization to be shaped when adding colorant, the vertical row of the image that laser printer 1 is got can distort.There are 10 to be not always the case in 10 Developing boxs 24.Therefore can determine: the colorant of nodularization shaping should not used as adding colorant.

To introduce the method for one usefulness Developing box excessively being added material below according to the utility model second embodiment.The Developing box of second embodiment and laser printer have with first embodiment in identical formation, so omitted its description, to avoid burdensome.

According to second embodiment, with first embodiment in identical method, before the colorant chamber of Developing box 24 26a fills with colorant again, measure the type that remains in the colorant of before having used among the 26a of colorant chamber in the video picture operational applications formerly.Yet,,, just can specify a kind of dissimilar colorant that has than the lower softening properties of previous used colorant in case the colorant type of before having used is determined according to second embodiment.Then, colorant chamber 26a is filled colorant with the type with this lower softening properties.

Softening properties is represented the easy degree that colorant is softening.The colorant that for example has higher glass transition point has than the lower softening properties of colorant with low glass transition point.And the colorant with big average particulate diameter has than with the lower softening properties of the colorant of less average particulate diameter.In addition, wherein the colorant of each particle with a uniformly softening temperature has the lower softening properties of packaging type colorant that has different thermal behaviors than kernel and shell.

Be noted that second embodiment has no particular limits the colorant type of filling during the video picture operational applications formerly in the 26a of colorant chamber, as long as the colorant that adds has lower softening properties.For example, the previous colorant that uses can be the polymerization colorant of floating type polymerization colorant, emulsion-type polymerization colorant, coated colorant or some other type, perhaps, also can be that nodularization is shaped or the pulverization colorant that is shaped of nodularization not.

As previously mentioned, in the video picture operating period of Developing box 24, side seal 58 can be scraped, and during the previous video picture operational applications of Developing box 24, when colorant was used up, its sealing ability can reduce.Thereby when Developing box 24 added colorant again and be used for the video picture operation once more, side seal 58 can not stop between sealing 58 of colorant approaching side and the developing roll 27 fully.

Under regular situation, the colorant that enters between seal and the developing roll can soften owing to the rubbing contact that the transmission imaging roller produces.When developing roll stopped operating, once Ruan Hua colorant cooled down, and was set on the developing roll.When developing roll rotated afterwards once more, the colorant that solidifies on the developing roll surface can be when developing roll rotates, and in the incision seal, thereby had accelerated the damage of seal, thus colorant by the clearance leakage between seal and the developing roll outside Developing box.

Yet according to second embodiment, colorant chamber 26a fills to have the colorant than the lower softening properties of softening properties of previous use colorant, therefore, when Developing box 24 is reused, even between the colorant approaching side that adds sealing 58 and the developing roll 27, this colorant can not soften yet.Therefore, when the Developing box 24 of Clean-mistake, need not change side seal 58, because be enough strong, even its sealing ability damage slightly to some extent with the side seal 58 of crossing.Expense and the trouble of changing seal can reduce, so can realize effectively adding the material operation.Owing to the colorant that adds is not easy because of softening with the developing roll rubbing contact,, thereby can not cut developing roll 27 and side seal 58 so the colorant of interpolation can not soften and solidify yet.

For example, if tested the making of the previous colorant of using that remains among the 26a of colorant chamber owing to previous video picture operational applications is the colorant type with 63 ℃ of glass heights, then can specify glass transition point is that 65 ℃ or higher colorant type are as adding colorant.Because the glass transition point of adding colorant is higher than the colorant of previous video picture operational applications, so it is lower to add the softening properties of colorant, thereby add colorant unlikely when Developing box 24 is reused, softening between side seal 58 and developing roll 27.

In another example, if tested the making of the previous colorant of using that remains among the 26a of colorant chamber owing to previous video picture operational applications is to have average particulate diameter in the sort of type of 8 to 11 micrometer ranges, or more particularly, the words of the colorant type in 9 to 10 micrometer ranges, then has average particulate diameter at 11 to 14 micrometer ranges, more particularly, the colorant type in 11 to 12 micrometer ranges can be designated as the interpolation colorant.In this example, be to be understood that then Developing box 24 should add to have the colorant of bigger average particulate diameter (from 11 to 14 micrometer range) when the previous colorant that uses has 11 microns of average particulate diameters.Owing to add the colorant of the average particulate diameter of colorant, so it is lower to add the softening properties of colorant greater than previous video picture operational applications.Therefore, the interpolation colorant unlikely when Developing box 24 is reused, softens between side seal 58 and developing roll 27.In addition, when the interpolation colorant has bigger average particulate diameter,, also be enough to stop during Developing box 24 is reused, add between sealing 58 of colorant approaching side and the developing roll 27 even the sealing ability of side seal 58 descends to some extent.Thereby can prevent colorant softening coagulation problem subsequently that reaches between side seal 58 and developing roll 27 more more reliablely.

The coated colorant is a type of polymerization colorant.Each pigment granules of coated colorant has sandwich construction, normally has the double-decker of a kernel and a shell.The softening temperature of interior nuclear polymer is lower than the outer cover polymer.Have different softening temperatures owing to this is two-layer, the coated colorant is softening in low temperature easily.So having the colorant of uniformly softening temperature than each particle, the coated colorant under very low temperature, has more good fixation performance.

According to present embodiment, if tested the making of the previous colorant of using that still remains among the 26a of colorant chamber owing to previous video picture operational applications is the coated colorant, the colorant that then each particle can be had the uniformly softening temperature is appointed as the interpolation colorant.Because a kind of like this colorant that adds has the softening properties more much lower than coated colorant, this colorant will be difficult for because of softening with developing roll 27 rubbing contact, even also be like this between sealing 58 of this interpolation colorant approaching side and the developing roll.Therefore can prevent that colorant from solidifying the problem of cutting developing roll 27 and side seal 58 again after softening.Owing to this reason, when correctly reusing Developing box 24, can prevent that colorant from leaking out from Developing box 24.

Obtaining the coated colorant can first polymerization kernel, and in converging operation subsequently, the shell higher than kernel softening temperature with a kind of softening temperature covers kernel then.Such its kernel of coated colorant is easy to be much more softening than shell.This has just produced a kind of coated colorant, generally has very high softening properties.Contrast with it, the interpolation colorant that each particle has the uniformly softening temperature then has much lower softening properties, so, even during reusing Developing box 24, add between sealing 58 of colorant approaching side and the developing roll 27, compare with the coated colorant, it extremely is difficult for softening.Therefore can prevent effectively that colorant from solidifying after softening, and then the problem of incision developing roll 27 or side seal 58.Owing to this reason, when correctly reusing Developing box 24, can prevent that colorant from leaking out from Developing box 24.

It should be noted that: when the coated colorant was used for previous video picture operational applications, the pulverization colorant that uses the nodularization shaping usually can be obtained the effect of first and second embodiment as adding colorant.That is: compare with the coated colorant, the pulverization colorant that nodularization is shaped had both had lower softening properties, had lower mobile characteristic again, so can realize the effect of first and second embodiment.

When describing some exemplary embodiment of the present utility model in detail, person skilled in the art will appreciate that and can make many possible modifications and variations and still keep many novel characteristics of the present utility model and advantage in these exemplary embodiments.

For example, first embodiment has described and taken out the polymerization colorant from the 26a of colorant chamber, specifically, and floating type polymerization colorant or emulsion-type polymerization colorant, residual 1.2 gram per centimeters of developing roll 27 every axial lengths or still less in the 26a of colorant chamber, preferably 0.7 gram per centimeter or colorant still less.Yet, should be pointed out that no matter be that what colorant is removed residual 1.2 gram per centimeters of every axial length of developing roll 27 in the 26a of colorant chamber or still less, preferably 0.7 gram per centimeter or colorant still less can reach roughly the same effect.That is to say, no matter the colorant of previous video picture operational applications is polymerization colorant (floating type polymerization colorant, emulsion-type polymerization colorant or a coated colorant), or pulverization colorant (no matter whether nodularization is shaped), if colorant is taken out residual 1.2 gram per centimeters of every axial length of developing roll 27 in the 26a of colorant chamber or still less, preferably 0.7 gram per centimeter or colorant still less play the screen phenomenon and just can prevent.Equally, in this one side of the utility model, to having no particular limits in order to the colorant type of adding Developing box 24.Add colorant and can be with Developing box 24 video picture operational applications formerly during used colorant type identical or different.

Also have, second embodiment has introduced by the polymerization kernel, then in converging operation subsequently, with have than kernel more the shell of high softening temperature cover kernel with acquisition coated colorant.Yet the coated colorant also can obtain by kernel and shell polymerization simultaneously.

Though embodiment has introduced the colorant type of determining previous usefulness during the previous video picture operational applications by the sample of colorant box, the user also can determine the type of previous used colorant by the character of opening colorant lid 60 and investigating previous used colorant.In other words, the step of determining previous used colorant type can be carried out before or after colorant covers 60 unlatchings.

Claims (12)

1. be used to carry out the video picture operation to manifest the display that the position manifests electrostatic latent image at an image, described display had before used developer to carry out the video picture operation, and described display comprises:

One is used to hold the chamber that holds of the developer that manifests electrostatic latent image, described developer is such one type developer, it than previous video picture operational applications during the used previous developer of using have lower mobile characteristic, described mobile characteristic is represented the flowability of described developer; And

One supporting manifests the developer bearing part of the developer of position from the image that holds chamber to and be used to manifest electrostatic latent image.

2. display as claimed in claim 1 is characterized in that, the described previous developer of using is residual floating type polymerization colorant, and comprises the outer doping of the mobile characteristic that is used to increase described residual floating type polymerization colorant; The described chamber of holding holds a floating type polymerization colorant, and the quantity of the outer doping that the quantity of the outer doping that it comprises is more contained than described residual floating type polymerization colorant is lacked.

3. display as claimed in claim 1 is characterized in that, described previous used developer is residual floating type polymerization colorant, and the described chamber of holding holds an emulsion-type polymerization colorant.

4. display as claimed in claim 1 is characterized in that, described previous used developer is residual floating type polymerization colorant, and the described chamber of holding holds a pulverization colorant through nodularization shaping processing.

5. display as claimed in claim 1, it is characterized in that, the described previous developer of using is residual emulsion-type polymerization colorant, it comprises the outer doping of the mobile characteristic that is used to increase described residual emulsion-type polymerization colorant, the described chamber of holding holds an emulsion-type polymerization colorant, and the quantity of the outer doping that the quantity of the outer doping that it comprises is more contained than residual emulsion-type polymerization colorant is lacked.

6. display as claimed in claim 1 is characterized in that, described previous used developer is residual emulsion-type polymerization colorant, and the described chamber of holding holds a pulverization colorant through nodularization shaping processing.

7. display as claimed in claim 1 is characterized in that, the described chamber of holding comprises two side respect to one another, also comprises:

One is used for entering from the outside and holds the chamber to add the inlet of developer to the chamber of holding, and described inlet is located on one of two side; And

One is used to drive the driving mechanism of developer bearing part motion, and described driving mechanism is located on another of two side.

8. one kind is used to carry out the video picture operation to manifest the display that the position manifests electrostatic latent image at an image, and described display had before used developer to carry out the video picture operation, and described display comprises:

One is used to hold the chamber that holds of the developer that manifests electrostatic latent image, described developer is such one type developer, it has lower softening properties than the video picture used developer of operating period that had before carried out, and described softening properties is represented the softening easy degree of developer; And

One supporting manifests the developer bearing part of the developer of position from the image that holds chamber to and be used to manifest electrostatic latent image.

9. display as claimed in claim 8 is characterized in that the described chamber of holding holds developer, and the glass transition point that it has is higher than the glass transition point of previous used developer.

10. display as claimed in claim 8 is characterized in that the described chamber of holding holds developer, and the average particulate diameter that it has is bigger than the average particulate diameter of previous used developer.

11. display as claimed in claim 8, it is characterized in that, described previous used developer is a coated colorant, and it is different with a shell and both thermal characteristicss that it has a kernel, and the described chamber of holding holds the developer that has the uniformity thermal characteristics inside and outside its each particle.

12. display as claimed in claim 8 is characterized in that, the described chamber of holding comprises two side respect to one another, also comprises:

One is used for entering from the outside and holds the chamber to add the inlet of developer to the chamber of holding, and described inlet is located on one of two side; And

One is used to drive the driving mechanism of developer bearing part motion, and described actuator is located on another of two side.

Images