CN202003142U

CN202003142U - Printing equipment with high fixing quality

Info

Publication number: CN202003142U
Application number: CN201120115818XU
Authority: CN
Inventors: 刘江
Original assignee: FOSHAN ESHENTE PRECISION FITTINGS Co Ltd
Current assignee: FOSHAN ESHENTE PRECISION FITTINGS Co Ltd
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-10-05
Anticipated expiration: 2021-04-19

Abstract

The utility model discloses printing equipment with high fixing quality. The printing equipment comprises a transfer printing medium conveying device, a photosensitive drum, a charging roller, an exposing device, a developing roller and a fixing device, wherein the fixing device consists of a fixing roller and a pressure bearing mechanism; the pressure bearing mechanism comprises a first pressure roller, a second pressure roller and a tension roller; a pressurizing band penetrates the three rollers; and the fixing roller is in press fit with a pressurizing band section between the first pressure roller and the second pressure roller. By the technical scheme, the press fit between the pressurizing band section and the fixing roller is realized, and in the fixing process, part of a transfer printing region for the transfer printing medium is pressed by the fixing roller and the pressurizing band, so that a toner on the transfer printing medium can be sufficiently heated and melted and the fixing reliability and quality are improved; in addition, the press fit between the fixing roller and the pressurizing band is the press fit of two arc regions and the press-fit force is dispersed onto the two arc regions, so that the excursion of the press-fit force is avoided and the assembling speed is improved during assembly.

Description

The printing device that a kind of fixing quality is high

Technical field:

The utility model relates to the high printing device of a kind of fixing quality.

Background technology:

Usually, in imaging device such as the duplicating machine of the use toner that utilizes static electrophotography, facsimile recorder, printer etc., toner supplies to developing apparatus by the toner feed device that comprises toner Cartridge etc. and prints to carry out continuous images.

The imaging process of this imaging device generally includes following steps: charging, exposure, development, transfer printing, separation, cleaning, removing electric charge and photographic fixing.

More specifically, in imaging process, the photosensitive drum surface that is driven in rotation is recharged device charge equably (charge step).So the photosensitive drum surface of charging uses the laser beam irradiation of exposure device to form electrostatic latent image (step of exposure).Subsequently, the electrostatic latent image on the photosensitive drums is developed the device development to form toner image (development step) at photosensitive drum surface.

Toner image on the photosensitive drums is transferred device and is transferred to (transfer step) on the offset medium, then, is transferred to toner image on the offset medium by fixing device heats and photographic fixing to offset medium (photographic fixing step).

On the other hand, the remaining toner that remains in photosensitive drum surface after transfer step is partly collected (cleaning) with the cleaning device cleaning and with predetermined collection.Photosensitive drum surface after the cleaning is removed residual electric charge to prepare imaging operation (electric charge removing step) next time by charge removing device.

The fixing device that uses in the photographic fixing step is made of pressure jointly fixing roller and pressure roll at present, this two independent roll bodies are a kind of line contacts to press fit, in the process of photographic fixing, the hot pressing of toner and offset medium only can be finished in moment, because offset medium contacts pressing place through fixing roller with the line of pressure roll with higher speed, the hot pressing of this moment occurs the part toner easily and can not get enough heats, cause the photographic fixing effect relatively poor, in addition, during assembling, the process that two rollers are involutory, be difficult to the two roll body centers of circle and pressing place are adjusted on the same axle axial line, make two involutory roll-ins make a concerted effort to occur skew, the wearing and tearing when increasing the roll body rotation between axle center and the roll body.

Summary of the invention:

The purpose of this utility model is in order to overcome the shortcoming of above-mentioned prior art, to provide a kind of photographic fixing effective, the printing device that the fixing device wearing and tearing are little.

For achieving the above object, the technical scheme that the utility model provides is: the printing device that a kind of fixing quality is high, include offset medium conveyer, photosensitive drums, charging roller, exposure device, developer roll and fixing device, fixing device is made of fixing roller, pressure support mechanism, pressure support mechanism includes first pressure roll, second pressure roll and jockey pulley, cross-under has the pressure zone of adding between three roll bodies, and the fixing roller pressing is lived and to be added the pressure zone section between first pressure roll and second pressure roll.

Adding the pressure zone main body is basic unit, is coated with crosslinking chemical layer, electric conductivity undercoat and fluororesin sinter layer on base layer exterior surface successively.

First pressure roll and second pressure roll are symmetrically distributed in the axis both sides that the fixing roller center of circle and the jockey pulley center of circle are linked to be.

In the employing after the art technical scheme, because by one section pressing that adds pressure zone realization and fixing roller, fixing, the part transfer surface territory of offset medium is by fixing roller and add the pressure zone pressing, toner on the collateral security offset medium is melted by heating fully, improve the reliability and the quality of photographic fixing, in addition, because fixing roller is the pressing that belongs to two arc surface territories with the pressing that adds pressure zone, pressure force is dispersed on the two arc surface territories, during assembling, the phenomenon of pressure force skew can not occur, accelerate the speed of assembling.

Description of drawings:

Fig. 1 is the structure principle chart of the utility model printing device;

The elevation cross-sectional view of Fig. 2 shows the toner Cartridge that constitutes imaging device, developing apparatus and on every side

Structure;

Fig. 3 is the structural representation of the utility model fixing device;

Fig. 4 is the enlarged drawing of Fig. 3 A part.

Embodiment:

Preferred forms of the present utility model is described below with reference to accompanying drawings.

Fig. 1 is the synoptic diagram of an exemplary embodiment of the utility model, shows the one-piece construction of use according to the imaging device of novel fixing device.The elevation cross-sectional view of Fig. 2 shows toner Cartridge, developing apparatus and the surrounding structure thereof that constitutes imaging device.

The imaging device 30 of present embodiment comprises: as shown in Figure 1, form the photosensitive drums 17 of electrostatic latent image on its surface; Be used to the charger 25 of photosensitive drums 17 surface chargings; Be used for forming the exposure device 22 of electrostatic latent image on photosensitive drums 17 surfaces; Be used for toner supply to photosensitive drums 17 surfaces latent electrostatic image developing is become the developing apparatus 20 of toner image; Be used for toner supply to developing apparatus 20 and based on electrophotography with the visual toner Cartridge 10 that changes into toner image of electrostatic latent image that forms on the photosensitive drums 17.

As shown in Figure 2, comprise according to the toner Cartridge 10 of present embodiment: toner discharger 3, it is rotated so that toner is discharged to its outside from toner container (toner storage area) 1; And toner agitator 8, its toner and structure relative that is used in the agitation of toner container 1 is connected to the developing apparatus 20 that is installed in imaging device 30 removably.

The one-piece construction of imaging device 30 will be described below.

As shown in Figure 1, the imaging device 30 according to present embodiment comprises: toner Cartridge 10, developing apparatus 20, photosensitive drums 17, charger 25, exposure device 22, cleaning device 26, transfer device 24, fixing device 23, paper feeding cassette 21, paper output tray 29 and scanner unit 31.

Photosensitive drums 17 is roller shape parts, and it is axially supported and is driven rotatably by not shown driver, thereby forms electrostatic latent image in its surface and form toner image.As photosensitive drums 17, for example, can use the roller shape parts that constitute by not shown conducting base, be formed with photographic layer on it.As conducting base, can use tubulose, cylindrical shape, sheet conducting base.In these conducting bases, preferred cylindric conducting base.As photosensitive drums 17, can adopt organic photo conductor drum, inorganic photosensitive drums etc.

Organic photo conductor drum can be the cascade type photosensitive drums, in this cascade type photosensitive drums, be laminated with charge generation layer that constitutes by the resinous coat that comprises the charge generation material and the charge transport layer that constitutes by the resinous coat that contains the charge transport material, perhaps organic photo conductor drum can be the individual layer photosensitive drums, is formed with the single-layer resin coating that not only comprises the charge generation material but also comprise the charge transport material in this individual layer photosensitive drums.

Inorganic photosensitive drums can be to comprise the film coating that is selected from a kind of, two or more materials in zinc paste, selenium, the amorphous silicon etc.Between conducting base and photographic layer, can insert primer coating.On photosensitive drum surface, can form the surface coating (protective finish) that is mainly used in the protection photosensitive drums.

Charger 25 carries out corona discharge on photosensitive drums 17, and adopts the serrate charger.Except the serrate charger, can use charge type charger, brush type charger, roll shape charger, magnetic brush type charger and other contact-type charger.

Although not shown, power supply is connected to charger 25 voltage is applied to charger 25.That is to say that charger 25 is suitable for receiving from power source voltage and applies and the predetermined voltage of predetermined polarity is filled on photosensitive drums 17 surfaces.

Exposure device 22 receives the input of the image information of the input of image information of the original work that read by scanner unit 31 or external unit, and shines the surface of charged electrostatically photosensitive drums 17 according to image information with flashlight.By this process, at the electrostatic latent image of the surface of photosensitive drums 17 formation corresponding to image information.As this exposure device 22, use the laser scanning system that comprises light source.

Laser scanning system is to comprise for example unit of light source, polygon mirror, f-0 lens, catoptron and other element.As light source, can use semiconductor laser, LED (light emitting diode) array, electroluminescence (EL) device etc.

As shown in Figure 2, developing apparatus 20 comprises toner Cartridge 10, development loader 11, agitating roller 13, developer roll 12 and regulating part 14.

Development loader 11 is the containers with roughly semi-cylindrical shaped structure of inner space, and it supports the two-component developing agent that agitating roller 13 and developer roll 12 and storage are made of toner and carrier rotatably.

Agitating roller 13 is driven to stir the two-component developing agent of storage in the development loader 11 by not shown driver rotation.

Developer roll 12 is the roller shape parts that two-component developing agent are transported to photosensitive drums 17, and is driven around its axis rotation by not shown driver.The opening that developer roll 12 passes development loader 11 is arranged on the opposite of photosensitive drums 17, separates predetermined gap with photosensitive drums 17.

The two-component developing agent of being carried by developer roll 12 contacts with photosensitive drums 17 in the zone of developer roll 12 the most close photosensitive drums 17.This contact area forms the development roll gap, at this, gives developer roll 12 by apply the development bias voltage from the not shown power supply that is connected to developer roll 12, and toner is from developer roll 12 lip-deep developer replenishing photosensitive drums 17 lip-deep electrostatic latent images.

Regulating part 14 is formed by sheet component, the long limit that this sheet component is parallel to extending axially of developer roll 12 and is arranged such that its top is developed loader 11 and is supported on developer roll 12 tops, and another long limit of bottom is positioned to separate certain interval with developer roll 12 surfaces.This regulating part 14 can be formed by stainless steel, or can be formed by aluminium, synthetic resin etc.

Transfer device 24 is roller shape parts, and it is supported rotatably by not shown supporting construction and arrange in the mode that contacts with photosensitive drums 17 pressure, thereby is driven rotatably by not shown drive unit.

As transfer device 24, can use by diameter is the roller shape parts that the metal-cored of for example 8-10mm and the elastic conducting layer that is formed on metal-cored surface form.As forming metal-cored metal, can use stainless steel, aluminium etc.As elastic conducting layer, can use the elastomeric material of sneaking into conductive materials such as carbon black etc., for example, ethylene-propylene-diene rubber (EPDM), foaming EPDM, foaming urethane etc.

Recording medium by roller for conveying paper sheets 27 with and the synchronous mode of the toner image that transmits of rotation by photosensitive drums 17 from the crimping part (transfer nip part) between 21 ground input photosensitive drums 17 of paper feeding cassette and the transfer device 24.

When recording medium during by the transfer nip part between light-sensitive roller 17 and the transfer device 24, the toner image on light-sensitive roller 17 surfaces is transferred on the recording medium.

Not shown power supply is connected to transfer device 24, when toner image is transferred on the recording medium, will be applied to transfer device 24 with the voltage of static charge opposite polarity on the toner that forms toner image.Therefore, toner image is transferred on the recording medium reposefully.

Cleaning unit 26 comprises not shown cleaning blade and not shown toner holding tank.Cleaning blade is the axially extended sheet component that is parallel to photosensitive drums 17, and is arranged to make the surface of an one long limit that weak point is distolateral in abutting connection with photosensitive drums 17.This cleaning blade is in abutting connection with the surface of photosensitive drums 17 of rotation, and removes the toner that remains in photosensitive drums 17 surfaces and paper scrap etc. at toner image from photosensitive drums 17 surface transfer after recording medium.The toner holding tank is the container-like component with hollow space, the interim toner of storing the scraping blade removing that is cleaned.So the cleaning unit 26 of structure cleans photosensitive drums 17 surfaces after the toner image transfer printing.

Fixing device 23 comprises fixing roller 32 and pressure support mechanism 15.Fixing roller 32 is by the rotatably supported roller shape of not shown structure parts, and can be by not shown shaft drive axis to rotation.The toner that has the formation unfixed toner image that not shown heating element carries with heating and the recording medium that partly transmits from transfer nip of photographic fixing in this fixing roller 32, thus with image fixing to recording medium.

As fixing roller 32, can use the roller shape parts that for example form by metal-cored and elastic layer.Metal-cored by forming such as metals such as iron, stainless steel, aluminium.Elastic layer is by forming such as silicon rubber, fluororubber elastomeric material.When the never illustrated power supply service voltage of heating element, heating element produces heat.Heating element can use Halogen lamp LED, infrared lamp etc.

Pressure support mechanism 15 (as shown in Figure 3 and Figure 4) includes first pressure roll 33, second pressure roll 34 and jockey pulley 35, cross-under has the pressure zone of adding 36 between three roll bodies, fixing roller 32 pressings are lived and to be added pressure zone section 37 between first pressure roll 33 and second pressure roll 34, after the assembling, first pressure roll 33 and second pressure roll 34 are symmetrically distributed in axis 38 both sides that the fixing roller center of circle and the jockey pulley center of circle are linked to be.This adds pressure zone 36 and is actuated to rotate along with the rotation of fixing roller 32, fixing roller 32 and add pressure contact portion between the pressure zone 33 and divide and form fusing nip portion.Adding pressure zone 36 main bodys is basic unit 361, is coated with crosslinking chemical layer 362, electric conductivity undercoat 363 and fluororesin sinter layer 364 on basic unit's 361 outside surfaces successively.

When toner image is heated by fixing roller 32 and photographic fixing to recording medium the time, add the toner of pressure zone 36 by will fusing and be pressed onto and help toner image on the recording medium to recording medium.

In fixing device 23, the recording medium of the toner image that has when transfer printing on it is during by fusing nip portion, and the toner that forms toner image is by photographic fixing and be pressed onto on the recording medium, thus toner image by photographic fixing to recording medium.Printing on it has the record images medium to be discharged to paper output tray 29 by paper outlet roller 28.

Paper feeding cassette 21 is to be used for for example pallet of common paper, art paper, color photocopying paper, OHP (projector) diaphragm etc. of housing recording.Not shown pick-up roller and transfer roller are to be sent to the transfer nip part with the synchronous ground of mode of the transmission of the toner image on photosensitive drums 17 surfaces with recording medium.

Scanner unit 31 is equipped with not shown file holding tray, the file forwarder (RADF) etc. that overturns automatically, also comprises not shown document reading apparatus.The autofile forwarder will be placed on the document board that original copy on the file holding tray is sent to document reading apparatus.Document reading apparatus comprises document board, document scanner, reflecting element and photoelectric commutator (charge-coupled device (CCD), be called " CCD " hereinafter) line sensor, thereby each multirow, for example, each 10 row read the image information that is placed on the original copy on the document board.

Document board is formed by the glass plate parts, and original copy is placed on it with from original copy reading images information.

Document scanner comprises the not shown light source and first catoptron, and it in complex way along the downside of document board and be parallel to the following side shifting of document board, is placed on the imaging surface of the file on the document board with fixed speed v with rayed.Can obtain reflected light image by this rayed.

Light source is to be used for being placed on optical transmitting set luminous on the original copy of document board.

First catoptron reflexes to reflection subassembly with reflected light image.

This reflection subassembly comprises the second and the 3rd not shown catoptron and optical lens, focusing on ccd line sensor by the reflected light image that document scanner obtains.Reflection subassembly is reciprocal along with moving back and forth of document scanner with the speed of v/2.

The second and the 3rd catoptron reflects this reflected light image towards optical lens.Optical lens focuses on ccd line sensor with reflected light image.Ccd line sensor comprises not shown CCD circuit, and it is used for the electric signal that the reflected light image opto-electronic conversion that optical lens focuses on becomes electric signal also will carry image information is outputed to the image processor of controller.

Image processor will convert electric signal from the picture information of supplies such as document reading apparatus or external device (ED) such as PC to, and this electric signal outputs to exposure device 22.

The above-mentioned description of this printing device being carried out with reference to embodiment is illustrative rather than determinate, therefore in the variation and the modification that do not break away under the utility model general plotting, should belong within the protection domain of the present utility model.

Claims

1. printing device that fixing quality is high, include offset medium conveyer, photosensitive drums, charging roller, exposure device, developer roll and fixing device, it is characterized in that: fixing device is made of fixing roller, pressure support mechanism, pressure support mechanism includes first pressure roll, second pressure roll and jockey pulley, cross-under has the pressure zone of adding between three roll bodies, and the fixing roller pressing is lived and to be added the pressure zone section between first pressure roll and second pressure roll.

2. the high printing device of a kind of fixing quality according to claim 1 is characterized in that: adding the pressure zone main body is basic unit, is coated with crosslinking chemical layer, electric conductivity undercoat and fluororesin sinter layer on base layer exterior surface successively.

3. the high printing device of a kind of fixing quality according to claim 1 is characterized in that: first pressure roll and second pressure roll are symmetrically distributed in the axis both sides that the fixing roller center of circle and the jockey pulley center of circle are linked to be.