CN201368967Y

CN201368967Y - Fixing device

Info

Publication number: CN201368967Y
Application number: CNU2008202068494U
Authority: CN
Inventors: 宋诗逸
Original assignee: JADASON ENTERPRISES (HONGKONG) Ltd; JADASON ELECTROMECHANICAL (DONGGUAN) Ltd
Current assignee: JADASON ENTERPRISES (HONGKONG) Ltd; JADASON ELECTROMECHANICAL (DONGGUAN) Ltd
Priority date: 2008-12-31
Filing date: 2008-12-31
Publication date: 2009-12-23
Anticipated expiration: 2018-12-31

Abstract

The utility model provides a fixing device, which comprises a heating roller for heating developer, and a fixing belt arranged below the heating roller, wherein the outer surface of the fixing belt abuts the outer surface of the heating roller to form an occlusal part, and the fixing belt which is of a closing belt piece circulatingly rotates along a closed path. The fixing device also comprises fixing belt positioning parts arranged on the closed path, wherein the positioning parts abut the inner surface of the fixing belt, and a heating plate is arranged at the upper part of the occlusal part along the rotating direction of the fixing belt in the closed path along which the fixing belt circulates; and the heating plate abuts the inner surface of the fixing belt. The fixing device can avoid the developer from affecting the fixing effect in the fixing process due to insufficient heating time, and ensure the fixing speed.

Description

A kind of fixing device

Technical field

The utility model relates to a kind of fixing device, especially a kind of fixing device that is used for duplicating machine or laser printer.

Background technology

Duplicating machine and laser printer are common printing equipments, for modern office provides great convenience.The mode that existing duplicating machine and laser printer all are to use electricity to take a picture forms image, in forming image process, will be on paper as printed medium as the carbon dust photographic fixing of developer, thus on paper, form required pattern and literal.Therefore, duplicating machine and laser printer are equipped with the fixing device of carbon dust photographic fixing on paper, and the structure of existing a kind of fixing device as shown in Figure 1.

Existing fixing device includes warm-up mill 11, and the middle part of warm-up mill 11 is provided with the heating source 12 of a circular shaft shape, and warm-up mill 11 is arrow A 1 direction rotation in the figure under the drive of heating source 12.Simultaneously, heating source 12 produces the required heat of warm-up mill 11 heating developers, so that warm-up mill 11 heats developer.

Photographic fixing band 13 is arranged below warm-up mill 11, and photographic fixing band 13 is a ring seal band spare, along a closed path cycle rotation.As seen from Figure 1, photographic fixing band 13 round-robin closed paths roughly become a del, and are provided with four positioning elements on photographic fixing band 13 round-robin closed paths, are respectively driven roller 14,

slewing rollers

15,16 and help roll 17.

Driven roller 14 is arranged on 13 1 steering positions of photographic fixing band, and arrow A 2 directions rotation in the figure, rotates along clockwise direction thereby drive photographic fixing band 13.

Slewing rollers

15,16 are arranged on two other steering position of closed path, are used to drive photographic fixing band 13 and turn to.Help roll 17 be arranged on warm-up mill 11 under, be used to push photographic fixing band 13, make the abut outer surfaces of the outside surface and the warm-up mill 11 of photographic fixing band 13.Driven roller 14,

slewing rollers

15,16 and help roll 17 all with the abutment of photographic fixing band 13, and define the round-robin closed path of photographic fixing band 13.

Outside surface and photographic fixing band 13 abut outer surfaces places at warm-up mill 11 form a bite 18, and bite 18 forms the photographic fixing path of print media.

As shown in Figure 1, during fixing device work, warm-up mill 11 rotates in the counterclockwise direction, and photographic fixing band 13 rotates under the driving of driven roller 14 along clockwise direction, fall on the outside surface of photographic fixing band 13 as the paper 20 of print media, and from bite 18 processes.Be loaded with the carbon dust 21 as developer on paper 20, when paper 20 process bite 18, the heat that warm-up mill 11 produces melts carbon dust 21, makes carbon dust 21 photographic fixing on paper 20, thereby forms required pattern and literal.

But, because warm-up mill 11 contacts formed bite 18 length with photographic fixing band 13 shorter, carbon dust on 11 pairs of paper 20 of warm-up mill is also just shorter 21 heat time heating times, makes part carbon dust 21 fail to melt fully also photographic fixing on paper 20, causes printing on the paper 20 of back lacking part pattern and literal.If warm-up mill 11 and photographic fixing band 13 velocities of rotation are reduced, can make paper 20 longer, but this will cause fixation rate to reduce, and be unfavorable for the raising of printing effect in 18 residence time of bite.

Therefore, existing part laser printer uses another kind of fixing device, and the structure of this fixing device as shown in Figure 2.Existing another kind of fixing device comprises warm-up mill 11 and backer roll 23, the abut outer surfaces of the outside surface of warm-up mill 11 and backer roll 23.Backer roll 23 comprises rotating shaft 24 and is arranged on rotating shaft 24 elastic layer 25 outward, elastic layer 25 is made by resilient material, and when warm-up mill 11 during to backer roll 23 pushings, elastic deformations take place elastic layer 25, direction depression along opposite with warm-up mill 11 forms state as shown in Figure 2.

Therefore, warm-up mill 11 is longer with backer roll 23 surface of contact, and the length of the bite 28 of formation is also longer, is the W among the figure.When paper 20 passes bite 28, warm-up mill 11 pushing backer rolls 23, and make the elastic layer 25 of backer roll 23 that elastic deformation take place, form long bite 28.Like this, carbon dust 21 can heat in long bite 28, obtains photographic fixing effect preferably.

But because this fixing device is in fixing, warm-up mill 11 needs pushing backer roll 23, and warm-up mill 11 and backer roll 23 are all caused damage, is unfavorable for the long-term use of warm-up mill 11 and backer roll 23.

Summary of the invention

Fundamental purpose of the present utility model provides the fixing device that a kind of photographic fixing is effective and fixation rate is fast;

Another purpose of the present utility model provides a kind of fixing device of effectively avoiding warm-up mill is caused damage.

For realizing above-mentioned fundamental purpose, the fixing device that the utility model provides comprises the warm-up mill that is used for the developer heating, be arranged on the photographic fixing band of warm-up mill below, the outside surface of photographic fixing band and the abut outer surfaces of warm-up mill also form bite, the photographic fixing band is a confining zone spare, along a closed path cycle rotation, fixing device also comprises the photographic fixing band positioning element that is arranged on the closed path, the abutment of positioning element and photographic fixing band, wherein, be provided with heating plate along the position that photographic fixing band rotation direction is positioned at the bite upstream in the photographic fixing band round-robin closed path, the abutment of heating plate and photographic fixing band is used for the photographic fixing band is heated.

By such scheme as seen, the heating plate that is provided with at photographic fixing band round-robin closed path internal gearing portion upstream position can effectively heat the photographic fixing band, after paper is fallen on the photographic fixing band, carbon dust on the paper will be heated plate and heat by the photographic fixing band, make carbon dust that be arranged long heat time heating time, thereby avoid the problem of carbon dust deficiency heat time heating time, improve the photographic fixing effect.

Simultaneously, because carbon dust is heated before entering bite, so paper need not stop the long period in bite, and the velocity of rotation of adjustable fast warm-up mill and photographic fixing band makes fixation rate very fast.

A preferred scheme is, photographic fixing band positioning element comprises driven roller, the slewing rollers that are arranged on the closed path steering position and is arranged on help roll under the warm-up mill, help roll is arranged between driven roller and the slewing rollers, heating plate is arranged between slewing rollers and the help roll, and help roll arrives the distance of driven roller greater than help roll to the distance of slewing rollers.

This shows that bite is arranged on the side near driven roller, bite distance the last period that is equivalent to extend can be arranged to heating plate long length, makes paper longer the heat time heating time on the photographic fixing band, the photographic fixing better effects if.

And,, avoid warm-up mill is caused damage because the warm-up mill of fixing device does not need to push flexible backer roll.

Description of drawings

Fig. 1 is the structural representation of existing fixing device and print media, developer;

Fig. 2 is the structural representation of existing another kind of fixing device and print media, developer;

Fig. 3 is the structural representation of the utility model first embodiment, has also shown the position relation of print media, developer and fixing device among the figure;

Fig. 4 is the structural representation of the utility model second embodiment, has also shown the position relation of print media, developer and fixing device among the figure;

Fig. 5 is the partial structurtes enlarged diagram of the utility model the 3rd embodiment, has also shown the position relation of print media and fixing device among the figure.

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment

Referring to Fig. 3, be the structural representation of the utility model first embodiment.Identical with existing first kind of fixing device, the fixing device of present embodiment comprises warm-up mill 31, photographic fixing band 33 and is arranged on a plurality of positioning elements on the photographic fixing band 33 round-robin closed paths.

Warm-up mill 31 is a columned roll body, and its middle part is provided with the heating source 32 of circular shaft shape, to warm-up mill 31 evolutions of heat, makes warm-up mill 31 outside surfaces have higher temperature.And heating source 32 rotates thereby drive warm-up mill 31 in the counterclockwise direction along the rotation of 3 directions of arrow A among the figure.

Photographic fixing band 33 is arranged on the below of warm-up mill 31, in the closed path of photographic fixing band 33 cycle rotations, be provided with four positioning elements, comprise the driven roller 34, slewing rollers 35 and the slewing rollers 36 that lay respectively at three steering positions, wherein driven roller 34 drives photographic fixing band 33 and rotates along clockwise direction along the rotation of 4 directions of arrow A among the figure.Simultaneously, driven roller 34,

slewing rollers

35,36 define photographic fixing band 33 round-robin paths, and with the abutment of photographic fixing band 33, photographic fixing band 33 is cycle rotation in this path.

The positioning element of photographic fixing band 33 also comprises the help roll 37 that is arranged under the warm-up mill 31, help roll 37 upwards pushes photographic fixing band 33, make the outside surface of the outside surface Contact Heating roller 31 of photographic fixing band 33, and forming bite 38 at the outside surface of warm-up mill 31 and photographic fixing band 33 abut outer surfaces places, bite 38 is the photographic fixing path of paper 40.

Be provided with a heating plate 43 in photographic fixing band 33 round-robin closed paths, heating plate 43 is arranged between slewing rollers 36 and the help roll 37, promptly is arranged on along photographic fixing band 33 rotation direction bite 38 upstream ends.And, its upper surface and photographic fixing band 33 abutment, and to 33 evolutions of heat of photographic fixing band, so that photographic fixing band 33 is heated.Simultaneously, in the present embodiment, help roll 37 is arranged on the middle position of halving of slewing rollers 36 and driven roller 34, and promptly bite 38 is identical to the distance of driven roller 34 with bite 38 to the distance of slewing rollers 36.

As seen from Figure 3, heating plate 43 comprises metal-based layer 44 and the heating layer 45 that adjoins each other, and wherein metal-based layer 44 is arranged on the side near photographic fixing band 33.During heating plate 43 work, heating layer 45 evolutions of heat, and heat conducted to metal-based layer 44 are with metal-based layer 44 heating.When metal-based layer 44 reached uniform temperature, metal-based layer 44 arrived photographic fixing band 33 with heat transferred, so that photographic fixing band 33 is heated.

During fixing device work, warm-up mill 31 rotates in the counterclockwise direction, and photographic fixing band 33 rotates under the driving of driven roller 34 along clockwise direction, and heating plate 43 evolutions of heat, will one section photographic fixing band 33 heating above heating plate 43.When paper 40 drops on the photographic fixing band 33, the one section photographic fixing band 33 that has been preheated will drop on paper 40 heating of its top, thereby will be arranged in carbon dust 41 heating on the paper 40.

When paper 40 was sent to bite 38, the carbon dust 41 on the paper 40 had obtained heating, again through after warm-up mill 31 heating, carbon dust 41 better photographic fixing on paper 40.Like this, through the heating of heating plate 43, the carbon dust 41 on the paper 40 has long heat time heating time, avoid causing because of 41 heat time heating times of carbon dust are short part carbon dust 41 can't photographic fixing on paper 40, guarantee fixing quality.

And because the heat time heating time of carbon dust 41 is longer, the warm-up mill 31 of fixing device can be heightened with the rotating speed of photographic fixing band 33, thereby guarantees fixation rate, guarantees printing effect.Simultaneously, because in the fixing, warm-up mill 31 is not subjected to the pushing of help roll 37 and photographic fixing band 33 and is out of shape, and can effectively avoid warm-up mill 31 and photographic fixing band 33 are caused damage.

Referring to Fig. 4, be the structural representation of the utility model second embodiment.Identical with first embodiment is in photographic fixing band 33 round-robin closed paths, be provided with heating plate 43 between slewing rollers 36 and the help roll 37, and heating plate 43 to be made up of with heating layer 45 metal-based layer 44 that adjoins each other.

In the present embodiment, warm-up mill 31 is arranged near driven roller 34 places with help roll 37, it is help roll 37 arrives driven roller 34 greater than help roll 37 to the distance of slewing rollers 36 distance, the length of heating plate 43 can be provided with longlyer like this, make the paper of falling on the photographic fixing band 33 40 that longer time preheating be arranged, allow carbon dust 41 that arranged longer heat time heating time.

This shows, the long heating plate 43 of length is set, can make carbon dust 41 that arranged longer heat time heating time, more effectively prevent because of carbon dust 41 is fully heated the fixing quality problem that causes, and can improve printing effect.

Referring to Fig. 5, be the structural representation of the utility model the 3rd embodiment.In the present embodiment, the part of photographic fixing band 53 and warm-up mill 31 adjacency is along the direction depression opposite with warm-up mill 31, and forms depressed part 55.Simultaneously, the bite 58 of adjoiner formation present embodiment between the outside surface of depressed part 55 outside surfaces of photographic fixing band 53 and warm-up mill 31.

And as seen from Figure 5, the heating plate of present embodiment 63 is bent downwardly near an end of bite 58, makes the photographic fixing band 53 that is arranged on heating plate 63 tops can be along the direction depression opposite with warm-up mill 31.Certainly, the heating plate 63 of present embodiment also is made up of with heating layer 65 metal-based layer 64 that adjoins each other.

Like this, bite 58 length that form between warm-up mill 31 and the photographic fixing band 53 are also longer, and paper 40 is also just longer in the time that bite 58 stops, and allow carbon dust that long time heating can be arranged, and help improving fixing quality.

Certainly, the foregoing description only is a preferable embodiment of the present utility model, in the practical application, more change can also be arranged, for example, near a side of heating layer pyrotoxin is set at heating plate, pyrotoxin can be well heater or lamp etc., to improve the efficiency of heating surface of heating plate; The alternative metals basic unit of basic unit that perhaps uses material such as pottery to make in heating plate, these change does not influence enforcement of the present utility model.

It is emphasized that at last the utility model is not limited to above-mentioned embodiment, also should be included in the protection domain of the utility model claim as the change of heating plate length, the change of heating plate shape, the small variations such as change of pyrotoxin.

Claims

1, a kind of fixing device comprises

Be used for warm-up mill with the developer heating;

Be arranged on the photographic fixing band of described warm-up mill below, the outside surface of described photographic fixing band and the abut outer surfaces of warm-up mill also form bite, and described photographic fixing band is a confining zone spare, along a closed path cycle rotation;

Be arranged on the photographic fixing band positioning element on the described closed path, the abutment of described positioning element and photographic fixing band;

It is characterized in that:

Be provided with heating plate, the abutment of described heating plate and photographic fixing band along the position that photographic fixing band rotation direction is positioned at the bite upstream in the described photographic fixing band round-robin closed path.

2, fixing device according to claim 1 is characterized in that:

Described heating plate comprises metal-based layer and the heating layer that adjoins each other, and described metal-based layer is arranged near photographic fixing band one side.

3, fixing device according to claim 1 and 2 is characterized in that:

Described photographic fixing band positioning element comprises driven roller, the slewing rollers (36) that are arranged on the closed path steering position and is arranged on help roll under the warm-up mill that described help roll is arranged between driven roller and the slewing rollers (36);

Described heating plate is arranged between slewing rollers (36) and the help roll.

4, fixing device according to claim 3 is characterized in that:

Described help roll arrives the distance of driven roller greater than help roll to the distance of slewing rollers (36).

5, fixing device according to claim 1 and 2 is characterized in that:

Described photographic fixing band caves in and the formation sunk part along the direction opposite with warm-up mill with the part of warm-up mill adjacency, and described bite is arranged between described photographic fixing band sunk part outside surface and the warm-up mill outside surface.

6, fixing device according to claim 2 is characterized in that:

Described fixing device also comprises the pyrotoxin that is arranged on close heating layer one side of described heating plate.

7, fixing device according to claim 6 is characterized in that:

Described pyrotoxin is well heater or lamp.