CN202003143U

CN202003143U - Special fixing device for printing device

Info

Publication number: CN202003143U
Application number: CN2011201158207U
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 a special fixing device for a printing device, which comprises a fixing roller and a pressure roller, wherein a heating element is arranged in the fixing roller, the fixing roller and the pressure roller are in axial balanced opposite-pressing fit, a cleaner is arranged on the outer circumferential surface of the pressure roller, and the cleaner is a scraping plate type cleaner or a roller type cleaner. After the fixing device is adopted, the following advantages are realized: as the pressure roller can avoid slipping, the operation of a recording medium is very stable and smooth, an image of a toner on the transfer printing surface of the recording medium can not be interfered, and the clear image of the toner after fixing can be ensured.

Description

The special-purpose fixing device of a kind of printing device

Technical field:

The utility model relates to the special-purpose fixing device of a kind of printing device.

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-member surface that is driven in rotation is recharged device charge equably (charge step).So the photosensitive-member of charging surface uses the laser beam irradiation of exposure device to form electrostatic latent image (step of exposure).Subsequently, the electrostatic latent image on the photosensitive-member is developed the device development to form toner image (development step) on the photosensitive-member surface.

Toner image on the photosensitive-member is transferred device and is transferred to (transfer step) on the recording materials, then, is transferred to toner image on the recording materials by fixing device heats and photographic fixing to recording materials (photographic fixing step).

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

The fixing device that uses in the photographic fixing step is made of pressure jointly fixing roller and pressure roll at present, heater element is set in fixing roller, heater element heats fixing roller, the recording medium that toner image is worn in transfer printing is during through the pressing district of high temperature fixing roller and pressure roll, heated by high temperature fixing roller high temperature, make the toner melted by heating, again in conjunction with the pressure effect of pressure roll, the toner of fusion is pressed together on the transfer surface of recording medium, for recording medium is passed through smoothly, require to keep between pressure roll and the recording medium certain friction force, but in the long-term process of using, because can have the medium powder on the recording medium surface, powder can be transferred to the pressure roll surface, because the existence of powder, cause in the process of hot pressing photographic fixing, skidding appears in pressure roll, influences the accuracy of recording medium operation, more seriously also can influence the sharpness of toner image on the recording medium transfer surface.

Summary of the invention:

The purpose of this utility model is in order to overcome the shortcoming of above-mentioned prior art, provides a kind of and do not influence the recording medium operation, guarantees after the photographic fixing toner image special-purpose fixing device of printing device clearly.

For achieving the above object, the technical scheme that the utility model provides is: the special-purpose fixing device of a kind of printing device, include fixing roller and pressure roll, and be provided with heating element in the fixing roller, fixing roller and pressure roll longitudinal balance are provided with clearer to press fit on the outer circumference surface of described pressure roll.

Described clearer is the scraper-type clearer.

Described clearer is the drum-type clearer.

Adopt the advantage behind this fixing device to be: because pressure roll skidding can not occur, the operation of recording medium is highly stable smooth and easy, and the toner image on the recording medium transfer surface can not be interfered, guarantee photographic fixing after toner image clear.

Description of drawings:

Fig. 1 is the laser beam printer structure principle chart that adopts the utility model fixing device;

Fig. 2 is the structural representation that the utility model fixing device adopts the scraper-type clearer;

Fig. 3 is the structural representation that the utility model fixing device adopts the drum-type clearer.

Embodiment:

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

Fig. 1 illustrates the constructed profile as the signal structure of the laser beam printer (being designated hereinafter simply as " printer ") 1 of image processing system according to this embodiment.

This printer 1 receives image information from the image information generator (not shown) such as the principal computer of the outside that is located at printer 1. and according to the image information that is received, a series of images of carrying out the last formation of recording materials (recording medium) P that is used in sheet image forms processing to printer 1 by known electrophotographic system.

Laser beam printer 1 comprises handle box 4, and described handle box 4 accommodates as the rotatable electrophotographic photosensitive member of the drum type of sub-image load bearing component (being designated hereinafter simply as " photosensitive-member ") 2, elementary charging mechanism 8 and developing device 3.In addition, printer 1 comprises laser scanner unit (being designated hereinafter simply as " scanner ") 5, and it forms the electrostatic latent image corresponding with image information according to the image information from the input of image information generator by exposure-processed on the outer surface of photosensitive-member 2.Printer 1 also comprises realization to the rotatable transfer member 6 of the roller shape of the processing of recording materials P transferred image, and is realizing that photographic fixing is handled, as to be used as image heater fixing device 7 with heat and pressure on the recording materials P of its transferred image.

Handle box 4 is printed the machine main body and removably supports.Printer main body forms the image processing system part beyond the handle box.When the repairing that needs photosensitive-member 2 and such as the time to the safeguarding of developing device 3 replenishment developers, opened can open and can be printed the lid 9 of machine body supports with closing after, can replace handle box 4 with new handle box, carry out rapidly and simply thus and safeguard.

Elementary charging mechanism 8 is suitable for by apply the bias voltage (regulated bias) of regulation from source power supply before the exposure-processed of scanner 5, makes the outer surface of the photosensitive-member 2 during the rotation be charged to the Potential distribution of regulation.

Scanner 5 output is according to from the time period electric data image signal of series of the image information of image information generator and modulated laser La.By being located at the window 4a in the handle box, laser La scans the charging zone on the outer surface of photosensitive-member 2 and exposes.Thus, corresponding with image information electrostatic latent image is formed on the outer surface of photosensitive-member 2.

Next, a series of images in the printer 1 being formed processing describes.When pressing the start button (not shown) that is located in the printer, photosensitive-member 2 begins rotation.Photosensitive-member 2 is along the circumferential speed rotation of the clockwise direction shown in the arrow K1 with regulation.Simultaneously, the elementary charging mechanism 8 of the bias voltage by being applied in regulation, the outer surface of photosensitive-member 2 is charged to the Potential distribution of regulation.

Next, according to the image information from the image information generator, the charging zone on the outer surface of 5 pairs of photosensitive-members 2 of scanner is scanned and is exposed.Therefore, corresponding with described image information electrostatic latent image is formed on the described charging zone of photosensitive-member 2.The developer that this electrostatic latent image is developed device 3 develops and as toner image and visual.

Simultaneously, by with the predetermined driven feed rolls 12 of timing from feeding box 11 1 time periods ground feeding recording materials P.Comprise many recording materials P that are layered in wherein in the feeding box 11.Feeding box 11 is printed machine and removably supports.The recording materials P that supplies with from feeding box 11 regularly is fed to the transfer printing pressing part that be formed on photosensitive-member 2 and transfer member 6 between to 12a with expectant control by registration roller (resist roller), and is held and carries by transfer printing pressing part.When recording materials P was held and carries by transfer printing pressing part, the toner image on the photosensitive-member 2 was transferred to recording materials P successively by transfer member 6.

The recording materials P that is transferred toner image stands toner image heating and photographic fixing processing in fixing device 7 after,, and be discharged to outside the printer by paper outlet roller 13 by the photographic fixing distributing roller 10 that is rotatably supported.The recording materials P that is discharged from rests on the paper output tray 14 that is attached to the printer top surface.In this way, finish a series of image and form processing.

Fixing device 7 comprises fixing roller 15 and pressure roll 16.Fixing roller 15 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 15, thus with image fixing to recording medium.

As fixing roller 15, 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 roll 16 is supported and presses the roller shape parts of fixing roller 15 rotatably by not shown pressure elements.This pressure roll 16 is actuated to rotate along with the rotation of fixing roller 15.Pressure contact portion between fixing roller 15 and the pressure roll 16 divides the formation fusing nip portion.

When toner image heated by fixing roller 15 and photographic fixing when recording medium P goes up, the toner of pressure roll 16 by will fusing is pressed onto recording medium P and goes up and help toner image to recording medium P.

Pressure roll 16 can use the roller shape parts that have same structure with fixing roller 15.Also can comprise heating element in the pressure roll 16.As this heating element, can use with fixing roller 15 in identical heating element, in order to remove the lip-deep powder of pressure roll, on the outer circumference surface of pressure roll 16, be provided with clearer, described clearer can be scraper-type clearer 17 (as shown in Figure 2), also can be drum-type clearer 18 (as shown in Figure 3).Present embodiment be to adopt scraper-type clearer 17, the scraper-type clearer has been arranged, just can ceaselessly clean out pressure roll 16 lip-deep powder, prevent to occur skidding between pressure roll 16 and the recording medium P, and influence fixing quality.

In fixing device 7, 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 14 by paper outlet roller 13.

The above-mentioned description of this fixing 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. the special-purpose fixing device of printing device includes fixing roller and pressure roll, is provided with heating element in the fixing roller, and fixing roller and pressure roll longitudinal balance is characterized in that press fit: be provided with clearer on the outer circumference surface of described pressure roll.

2. the special-purpose fixing device of a kind of printing device according to claim 1, it is characterized in that: described clearer is the scraper-type clearer.

3. the special-purpose fixing device of a kind of printing device according to claim 1, it is characterized in that: described clearer is the drum-type clearer.