CN203965804U - Fixing device and image forming apparatus - Google Patents

Abstract

The utility model discloses a kind of fixing device and image forming apparatus.Wherein, a kind of fixing device is provided, comprise warm-up mill and backer roll, this warm-up mill comprises heater block, this warm-up mill and this backer roll clamping recording medium, and this warm-up mill and this backer roll are arranged to the photographic fixing embossed region that faces with each other to limit recording medium process, fixing device is characterised in that, warm-up mill also comprises the evenly heating parts that are formed on warm-up mill inside, and evenly heating parts are made up along length direction extension and the evenly heating parts of warm-up mill the uniformity of temperature profile making on length direction of Heat Conduction Material.The utility model provides the fixing device of electromagnetic induction heating mode, and it can improve the efficiency of heating surface, makes the end region temperature homogenising of fixing device.

Description

Fixing device and image forming apparatus

Technical field

The image forming apparatus that the utility model relates to the fixing device for making equalizing temperature and comprises this fixing device.

Background technology

Imaging device is designed to print image on recording medium.The example of imaging device comprises printer, duplicating machine, facsimile recorder and the device in conjunction with the function of printer, duplicating machine, facsimile recorder.In electrophotographic image forming, the photoconductor that has been charged to predetermined potential is exposed, thereby forms electrostatic latent image on the surface of photoconductor.Afterwards, developer is supplied to electrostatic latent image to form visual image.The visual image being formed on photoconductor is transferred to recording medium, then when through fixing device, is arrived recording medium by photographic fixing.

Common widely used fixing device comprises: heating unit comprises thermal source in heating unit; Presser unit, is arranged to and heating unit close contact, to limit photographic fixing embossed region with heating unit.If the recording medium that image has been transferred thereon is incorporated in the photographic fixing embossed region between heating unit and presser unit, image is arrived recording medium by heat and pressure by photographic fixing.

In the past, the heater block of roller shape was to reach to reduce costs to save the object of the energy, used fluorescent tube and reduced the thickness of metallic roll, thereby can make thermal capacity diminish, cut down required electric weight, but when photographic fixing recording chart, can produce the problem of crossing the extra-regional temperature rise of paper etc. of fixing member.For avoiding this problem, adopt many fluorescent tubes, make it have multiple corresponding heated perimeters.Result has caused cost to rise and has added the complicated of heat control.In addition, although used the technical scheme of load coil subregion etc., the shortcoming that this also exists cost to rise.

Utility model content

The purpose of this utility model be to improve the heater block of fixing device and by recording materials photographic fixing to thermally equivalent degree and hot transfer efficiency on the length direction of the ring rotation parts of recording chart.

According to an aspect of the present utility model, a kind of fixing device is provided, comprise warm-up mill and backer roll, this warm-up mill comprises heater block, this warm-up mill and this backer roll clamping recording medium, and this warm-up mill and this backer roll are arranged to the photographic fixing embossed region that faces with each other to limit recording medium process, and fixing device is characterised in that, warm-up mill also comprises the evenly heating parts that are formed on warm-up mill inside, and evenly heating parts are made up along length direction extension and the evenly heating parts of warm-up mill the uniformity of temperature profile making on length direction of Heat Conduction Material.

Preferably, these evenly heating parts are heat pipes that length is extended on identical bearing of trend with warm-up mill.

Preferably, heat pipe is multiple, and multiple heat pipe is arranged on the circumferencial direction of warm-up mill and is connected to each other.

Preferably, multiple heat pipes are integrally formed.

Preferably, these evenly heating parts are made up of the high metal of pyroconductivity.

Preferably, this fixing device also comprises: sensor, the width of sensing recording medium.

Preferably, this heater block is Halogen lamp LED.

Preferably, this heat pipe is plane.

Preferably, this warm-up mill also comprises warm-up mill base tube, and evenly heating parts are placed between warm-up mill base tube and heater block.

According on the other hand of the present utility model, a kind of image forming apparatus is provided, comprise the fixing device according to above any one.

By adopting such technical scheme, the fixing device of electromagnetic induction heating mode can be provided, it can improve the efficiency of heating surface, makes the end region temperature homogenising of fixing device.

Brief description of the drawings

In the accompanying drawings, the similar reference symbol in different views generally represents same section.Accompanying drawing is not necessarily drawn in proportion, focuses on principle of the present utility model to carry out graphic extension.In the following description, according to the following drawings, the various embodiments of the utility model is illustrated, in the accompanying drawings:

Fig. 1 is according to the entire block diagram of the image forming apparatus of an aspect of the present utility model;

Fig. 2 shows the diagram of the fixing device of the image forming apparatus shown in Fig. 1; And

Fig. 3 shows the sectional view of the fixing device described in Fig. 2.

Embodiment

Below describe in detail with reference to accompanying drawing and carry out, accompanying drawing schematically illustrates can implement detail of the present utility model and embodiment.

Can use herein about side or surface " on " form material word " on ", represent this material can be formed at " directly " described side or surface " on ", for example, be in direct contact with it.Can use herein about side or surface " on " form material word " on ", represent material can " indirectly " be formed at described side or surface " on ", between described side or surperficial and this material, be provided with one or more extra plays.

In the present embodiment, illustrate the fixing device of an embodiment of the present utility model is equipped on to the example in the electrophotographic copier (following, to be only called " duplicating machine ") as an embodiment of image processing system.

In Fig. 1, duplicating machine A basis is transmitted the view data of coming or has been read the view data of original copy from outside, recording paper is formed to image.Duplicating machine A possesses: original treatment plant 10, sheet feed section 20, image forming part 30 and ADF portion 15.Original treatment plant 10 possesses original copy mounting table 11, original document feeder 12 and manuscript reading section 13 in device framework 1.

Original copy mounting table 11 is made up of clear glass, becomes the structure that can load original copy.Original document feeder 12 is carried the original copy being loaded in original copy pallet 12a one by one.Original document feeder 12 is configured in the paper depth direction of Fig. 1 and freely rotates, and by opening the top of original copy mounting table 11, thereby can in original copy mounting table 11, place original copy.Manuscript reading section 13 reads the original copy of being carried by original document feeder 12 or loads in the original copy of original copy mounting table 11.

Sheet feed section 20 possesses paper feeding cassette 21 and pickup roller 22.Pickup roller 22 is arranged near the end of paper feeding cassette 21, from paper feeding cassette 21, recording paper P is rubbed one by one with the hands paper and is supplied to paper transport path 25.

Image forming part 30 possesses: photosensitive drums 31, charged device 32, developer 33, clearer portion 34, exposing unit 35, transfer roll 36 and fixing device 38 etc.

Image forming part 30 is the image forming parts that utilize electrofax mode, the view data that outside transmission based on from duplicating machine A comes or the view data that has read original copy, to making the charged photosensitive drums of surface uniform 31 by applying to the bias voltage of charged device 32, form electrostatic latent image from exposing unit 35 irradiating lasers.By developer 33, this electrostatic latent image is carried out to toner development and visual.In addition, rub paper by pickup roller 22 with the hands to being arranged on the paper P packing in the paper feeding cassette 21 of bottom of device framework 1, and be delivered to the clamping part between photosensitive drums 31 and transfer roll 36 by conveying roller 37.And, by applying to the bias voltage of transfer roll 36, the toner image in photosensitive drums 31 is transferred to paper P and carries out image formation.By transfer printing the paper P of toner image deliver to fixing device 38, heating, pressurizeing by fixing device 38, to after toner image photographic fixing, be expelled to ADF portion 15 by distributing roller 39 thus.

Below, describe in detail according to fixing device of the present utility model referring to figs. 2 to Fig. 3.Wherein, Fig. 2 shows the detailed view of the fixing device shown in Fig. 1, and Fig. 3 is the sectional view of the fixing device shown in Fig. 2.

As shown in Figure 2, warm-up mill 210 and backer roll 220 are arranged to the photographic fixing embossed region that faces with each other to limit paper P (not shown) process, thereby and warm-up mill 210 and backer roll 220 contact clamping paper with certain pressure.Warm-up mill 210 comprises formation evenly heating parts 230 therein.Evenly heating parts 230 extend in the same direction with warm-up mill 210.For example, evenly heating parts 230 are heat pipes extending longitudinally along warm-up mill 210 and are made up of the high metal of thermal conductivity.In addition, comprise that the fixing device of warm-up mill 210 and backer roll 220 can also comprise sensor (not shown), for the width of sensing paper.

Fig. 3 is the sectional view of the fixing device shown in Fig. 2.As shown in Figure 3, evenly heating parts 330 are formed on warm-up mill inside, and particularly, evenly heating parts 330 are formed between warm-up mill base tube 350 and heater block 340 along the inner periphery direction of heating tube.Wherein, can use Halogen lamp LED as heater block 340.As shown in Figure 3, warm-up mill 310 offsets with certain pressure each other with backer roll 320, thereby limits betwixt the photographic fixing embossed region of paper process.Evenly heating parts 330 in Fig. 3 comprise multiple heat pipes connected to one another on the circumferencial direction that is arranged in warm-up mill 310.Preferably, multiple heat pipes are plane heat pipes and are to be integrally formed.

According to the embodiment shown in Fig. 2 and Fig. 3, use novel fixing device to there is warm-up mill, backer roll according to this, form in the inner side of warm-up mill as heat pipes evenly heating parts, that extend along warm-up mill.Preferably, can arrange multiple heat pipes, these heat pipes are connected side by side along the circumferencial direction of warm-up mill, these heat pipes are constituted as and can transmit heat.Meanwhile, there is heating fluorescent tube in the inner side of warm-up mill.According to the utility model, without adopting many corresponding fluorescent tubes in order to change the Temperature Distribution on length direction.In photographic fixing is processed, warm-up mill heats by heating fluorescent tube, and due to the rotation of heating tube, when it rolls on the backer roll with temperature difference, heat can be seized, and can keep in the longitudinal direction the homogeneity of temperature.According to the utility model, by heat pipe being set in warm-up mill inside, make the temperature of gap area can quick and stable.In addition, crossing when paper, toner is dissolved and be fixed on the recording chart being transferred, the Temperature Distribution of fixing device is according to the width of the recording chart of conveying and difference.For example, in the time carrying A4-R (the long limit of A4), B5-R (the long limit of B5) etc., as photographic fixing processing, the region of mistake paper is only a part for photographic fixing embossed region.In the prior art, normally according to paper width, adopt many different fluorescent tubes of heating region.Obviously, there is following problem thereby there is this technology that many fluorescent tubes change heating regions: owing to not being corresponding all paper widths, thereby heated by the part of the heating region beyond the width of the recording chart of photographic fixing, make temperature rise.In the past, adopted heater block and the integrated structure of pressurization gap parts.

Thus, the temperature of crossing paper part if non-continues to rise, and heater block continues heating, crosses after paper, or while crossing paper, the recording chart that width is larger is passed through at the recording chart that width is less, photographic fixing easily occurs bad.In addition, also likely there is abnormal heating, the heater block of film is caught fire, breakage, have to stop photographic fixing operation.

And in the utility model, because heater block itself is as ring-type heating evenly heating parts, thereby can make the temperature on length direction even.In the time that the less recording chart of width is crossed paper, the non-paper regional temperature of crossing of warm-up mill rises, because the heat pipe parts of warm-up mill inside can, by the non-temperature of crossing paper region to crossing the transmission of paper position, can not make the non-paper region of crossing of fixing device heat up.In addition, by heat pipe parts, backer roll is carried out to evenly heating, can reduce the temperature inequality in pressurization gap, guarantee the temperature that fixing device is required.

In addition, can improve on the high speed machine of output, even if it is less to cross the amplitude of paper paper, continuous, while crossing paper, the temperature that also can suppress paper region declines, and non-temperature rise of crossing paper region.

By adopting such technical scheme, the fixing device of electromagnetic induction heating mode can be provided, it can improve the efficiency of heating surface, makes the end region temperature homogenising of fixing device.

Above according to specific implementations, the utility model is specifically illustrated and illustrated, but only one skilled in the art will understand that otherwise depart from purport of the present utility model and the scope that claims limit, can carry out various changes to its form and details.Therefore, scope of the present utility model as described in the appended claims, therefore, as long as meet meaning and the scope of claim equivalent, can be carried out various changes.

Claims (10)

1. a fixing device, comprise warm-up mill and backer roll, described warm-up mill comprises heater block, described warm-up mill and described backer roll clamping recording medium, and described warm-up mill and described backer roll are arranged to the photographic fixing embossed region that faces with each other to limit described recording medium process, described fixing device is characterised in that

Described warm-up mill also comprises the evenly heating parts that are formed on described warm-up mill inside, and described evenly heating parts are made up along length direction extension and the described evenly heating parts of described warm-up mill the uniformity of temperature profile making on described length direction of Heat Conduction Material.

2. fixing device according to claim 1, wherein, described evenly heating parts are heat pipes that length is extended on identical bearing of trend with described warm-up mill.

3. fixing device according to claim 2, described heat pipe is multiple, and multiple described heat pipe is arranged on the circumferencial direction of described warm-up mill and is connected to each other.

4. fixing device according to claim 3, wherein, multiple described heat pipes are integrally formed.

5. fixing device according to claim 1, wherein, described evenly heating parts are made up of the high metal of pyroconductivity.

6. fixing device according to claim 1, also comprises: sensor, the width of recording medium described in sensing.

7. fixing device according to claim 1, wherein, described heater block is Halogen lamp LED.

8. fixing device according to claim 3, wherein, described heat pipe is plane.

9. fixing device according to claim 1, wherein, described warm-up mill also comprises warm-up mill base tube, described evenly heating parts are placed between described warm-up mill base tube and described heater block.

10. an image forming apparatus, is characterized in that, comprises according to the fixing device described in any one in claim 1 to 9.