阅读说明：本技术 定影装置以及图像形成装置 (Fixing device and image forming apparatus ) 是由 斋藤祐一郎 于 2018-12-17 设计创作，主要内容包括：本发明提供一种与配置成接触部件重叠于加热部件的铅垂上方的结构相比,能够抑制接触部件的过度的温度上升的定影装置以及图像形成装置。本发明的定影装置包括：加热部件,具有热源且可旋转；加压部件,与加热部件一起形成辊隙且可旋转；以及接触部件,可与加热部件接触及离开加热部件,且配置于下述位置,即：在接触部件与加热部件接触的状态下,接触部件未重叠于加热部件的铅垂方向上方,且在接触部件离开加热部件的状态下,接触部件未重叠于加热部件的铅垂方向上方。(The present invention provides a kind of compared with being configured to the structure above the vertical that contact component is overlapped in heating element, is able to suppress fixing device and image forming apparatus that the excessive temperature of contact component rises.Fixing device of the invention includes: heating element, has heat source and rotatable；Pressing member is formed together roll gap and rotatable with heating element；And contact component, can with heating element contacts and leave heating element, and it is configured at following positions, that is: in the state of contact component and heating element contacts, contact component is underlapped above the vertical direction of heating element, and in the state that contact component leaves heating element, contact component is underlapped above the vertical direction of heating element.)

1. a kind of fixing device characterized by comprising

Heating element has heat source and can rotate；

Pressing member is formed together roll gap with the heating element and can rotate；And

Contact component, can with the heating element contacts and leave the heating element, and

Be configured at following positions: in the state of the contact component and the heating element contacts, the contact component is not weighed It is laminated on above the vertical direction of the heating element, and in the state that the contact component leaves the heating element, it is described Contact component is underlapped above the vertical direction of the heating element.

2. fixing device according to claim 1 characterized by comprising

Temperature detecting component detects the temperature of the heating element, and

It is configured at following positions: in the state of the contact component and the heating element contacts, the temperature detecting component It is underlapped above the vertical direction of the heating element, and in the state that the contact component leaves the heating element, The temperature detecting component is underlapped above the vertical direction of the heating element.

3. fixing device according to claim 2, which is characterized in that

It is configured at following positions: in the state of the contact component and the heating element contacts, the temperature detecting component It is underlapped above the vertical direction of the contact component, and in the state that the contact component leaves the heating element, The temperature detecting component is underlapped above the vertical direction of the contact component.

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

The rotation of the heating element of the contact component and the temperature detecting component in the circumferential direction of the heating element The upstream side for turning the roll gap on direction is configured at below the vertical direction of the heating element.

5. fixing device according to any one of claim 1 to 4, which is characterized in that

The contact component is relative to the heating element and to leaving below gravity direction.

6. fixing device according to claim 5, which is characterized in that the contact component is from the periphery of the heating element The distance that face is left is the bigger compared with the horizontal direction perpendicular to gravity direction in downward direction of gravity direction.

7. a kind of image forming apparatus characterized by comprising

Image forming part formed to the image of recording medium；

Paper feed part sends out the recording medium to described image forming member；

Fixing device described in any one of claims 1 to 6, to the note for foring image by described image forming member The fixing of recording medium progress described image；And

Recording medium conveyance member extends in an approximate vertical direction between the fixing device and the paper feed part.

Technical field

The present invention relates to a kind of fixing device and image forming apparatuses.

Background technique

It has been known that there is a kind of fixing devices comprising: fixing member, by the developer picture in recording medium while rotating It heats and makes its fixing；Pressing element clamps recording medium with fixing member and pressurizes；Cooling component, can be with fixing structure The periphery face contact of part and keep out of the way from the outer peripheral surface, drops the temperature of fixing member with the periphery face contact of fixing member It is low；Detection component detects recording medium in the transport path of recording medium；And moving parts, mobile cooling component with Contact cooling component with fixing member, on the outer peripheral surface of the fixing member calculated by the detecting result according to detection component Come the contact position with cooling component with the contact position of the front end of recording medium, and being situated between on fixing member with record When the contact position of the front end of matter comes contact position, cooling component is made to leave (patent document 1) from fixing member.

[existing technical literature]

[patent document]

Patent document 1: Japanese Patent Laid-Open 2012-27168 bulletin

Summary of the invention

[problem to be solved by the invention]

The present invention provide it is a kind of compared with being configured to the structure above the vertical that contact component is overlapped in heating element, can The fixing device and image forming apparatus for inhibiting the excessive temperature of contact component to rise.

[technical means to solve problem]

In order to solve described problem, fixing device documented by technical solution 1 includes:

Heating element has heat source and rotatable；

Pressing member is formed together roll gap and rotatable with the heating element；And

Contact component, can with the heating element contacts and leave the heating element, and

It is configured at following positions: in the state of the contact component and the heating element contacts, the contact component It is underlapped above the vertical direction of the heating element, and in the state that the contact component leaves the heating element, The contact component is underlapped above the vertical direction of the heating element.

Invention is the fixing device according to documented by technical solution 1 documented by technical solution 2, comprising:

Temperature detecting component detects the temperature of the heating element, and

It is configured at following positions: in the state of the contact component and the heating element contacts, the temperature detecting Component is underlapped above the vertical direction of the heating element, and leaves the state of the heating element in the contact component Under, the temperature detecting component is underlapped above the vertical direction of the heating element.

Invention is the fixing device according to documented by technical solution 2 documented by technical solution 3, is configured at following positions: In the state of the contact component and the heating element contacts, the temperature detecting component is underlapped in the contact component Vertical direction above, and in the state that the contact component leaves the heating element, temperature detecting component it is underlapped in Above the vertical direction of contact component.

Invention is the fixing device according to documented by technical solution 3, the contact component and institute documented by technical solution 4 State the roll gap on the direction of rotation of the heating element of the temperature detecting component in the circumferential direction of the heating element Upstream side is configured at below the vertical direction of the heating element.

Invention is the fixing device according to documented by any one of technical solution 1 to 4 documented by technical solution 5, described Contact component is relative to the heating element and to leaving below gravity direction.

Invention documented by technical solution 6 is the fixing device according to documented by technical solution 5, and the contact component is from institute State the distance that the outer peripheral surface of heating element leaves be gravity direction in downward direction more compared with the horizontal direction relative to gravity direction Greatly.

In order to solve described problem, image forming apparatus documented by technical solution 7 includes:

Image forming part formed to the image of recording medium；

Paper feed part sends out the recording medium to described image forming member；

Fixing device documented by any one of technical solution 1 to 6 forms image to by described image forming member The recording medium carries out the fixing of described image；And

Recording medium conveyance member extends in an approximate vertical direction between the fixing device and the paper feed part.

[The effect of invention]

It is invented according to documented by technical solution 1, is overlapped in above the vertical of heating element with contact component is configured to Structure is compared, and the excessive temperature for being able to suppress contact component rises.

It is invented according to documented by technical solution 2, it is mobile to temperature detecting component to be able to suppress the heat from heating element It impacts.

It is invented according to documented by technical solution 3, it is mobile to temperature detecting component to be able to suppress the heat from contact component It impacts.

It is invented according to documented by technical solution 4, can be realized the space saving of fixing device.

It is invented according to documented by technical solution 5, the heat that can be reliably suppressed from heating element to contact component is mobile.

It is invented according to documented by technical solution 6, can more reliably inhibit to move from heating element to the heat of contact component It is dynamic.

It is invented according to documented by technical solution 7, and has between fixing device and paper feed part and prolong in the horizontal direction The case where recording medium conveyance member stretched, is compared, and following positions can be widely ensured in the circumferential direction of heating element, That is: in the state of contact component and heating element contacts, contact component is underlapped above the vertical direction of heating element, and In the state that contact component leaves the heating element, contact component is underlapped in the vertical direction of the heating element Side.

Detailed description of the invention

Fig. 1 is the schematic cross-section for indicating the internal structure of image forming apparatus.

Fig. 2 is the schematic cross-section for indicating the structure of fixing device.

Fig. 3 is the section signal for the fixing device being illustrated to the configuration of heat absorption roller and thermostat (thermostat) Figure.

Fig. 4 (a)~Fig. 4 (c) is to indicate that the section of the fixing device of an example of concrete configuration of heat absorption roller and thermostat shows It is intended to.

Fig. 5 (a) and Fig. 5 (b) is the schematic cross-section for the fixing device being illustrated to the moving direction of heat absorption roller.

Fig. 6 is the schematic cross-section for indicating the internal structure of image forming apparatus of variation.

Fig. 7 is the schematic cross-section for indicating the fixing device of variation.

Fig. 8 (a)~Fig. 8 (c) is the figure for indicating the configuration example of the fixing device of C-channel carrying channel.

Fig. 9 is the schematic cross-section of the configuration of the heat absorption roller in the fixing device for indicate comparative example.

The explanation of symbol

1,1A: image forming apparatus

10: control device

20: paper feed

30: photo-conductor unit

31: photoconductor drum

40: developing apparatus

50: transfer device

60: fixing device

61: heating module

610: heating roller

613: thermostat

62: compression module

620: press belt

630: heat absorption roller

N: fusing nip portion

Specific embodiment

Then, on the one hand referring to attached drawing, on the one hand following embodiment and the concrete example enumerated is more detailed to present invention progress Illustrate, but the present invention is not limited to these embodiments and concrete examples.

Moreover, using in the explanation of the following drawings, attached drawing be it is schematic, should be noted ratio of each size etc. with reality not Together, the diagram other than the component for easy understanding and needed for illustrating suitably is omitted.

In addition, front-rear direction is set as X-direction in attached drawing in order to be readily appreciated that the following description, by left and right directions It is set as Y direction, up and down direction is set as Z-direction.

(1) overall structure and movement of image forming apparatus

Fig. 1 is the schematic cross-section for indicating the internal structure of image forming apparatus 1 of present embodiment.

Hereinafter, being on the one hand on the one hand illustrated to the overall structure and movement of image forming apparatus 1 referring to attached drawing.

Image forming apparatus 1 be configured to include control device 10, paper feed 20, photo-conductor unit 30, developing apparatus 40, Transfer device 50 and fixing device 60.It is formed with discharge tray 1a in the upper surface (Z-direction) of image forming apparatus 1, this discharge Pallet 1a discharge, receiving have recorded the paper of image.

Control device 10 has the controller 11 of the movement of control image forming apparatus 1, by 11 control action of controller Image processing part 12 and power supply device 13 etc..Power supply device 13 to aftermentioned charged roller 33, developer roll 42, primary transfer roller 52, Secondary transfer roller 53 etc. apply voltage.

Image processing part 12 will be from external information transmitting apparatus (such as personal computer (personal computer) Deng) the printing information of input is converted into the image information of sub-image formation, and it is defeated to exposure device LH with preset opportunity Driving signal out.The exposure device LH of present embodiment is by matching light emitting diode (Light Emitting Diode, LED) Linear LED head is set to be constituted.

Paper feed 20 is equipped in the bottom of image forming apparatus 1.Paper feed 20 has paper tray 21, paper tray Stowage has the paper P of most Zhang Zuowei recording mediums on 21.Stowage is on paper tray 21 and width direction and length direction Position is to draw extraction unit 22 by paper from upside to take out one by one forwards (-X direction) by the paper P that restriction plate (not shown) is determined After out, transport to resist printing roller (resist roller) to 23 nip portion.

Photo-conductor unit 30 includes the top (Z-direction) for being set to paper feed 20 side by side respectively, and rotates the conduct of driving Photoconductor drum 31 of the carbon dust as keeping body.Along the direction of rotation of photoconductor drum 31, configured with charged roller 33, exposure device LH, Developing apparatus 40, primary transfer roller 52, cleaning blade (cleaning blade) 35.For charged roller 33, in opposite directions, contiguously match It is equipped with the clearer 34 of the surface cleaning of charged roller 33.

Developing apparatus 40, which has, contains the development shell 41 of developer in inside.Development shell 41 in, be equipped with Below the developer roll 42 as developing parts and the back side in the developer roll 42 that photoconductor drum 31 configures opposite to each other tilt A pair of of auger (auger) 44A, 44B of conveying developer is stirred towards 42 side of developer roll.It is close to be configured with for developer roll 42 Limit the layer limiting member 46 of the thickness of developer.

Developing apparatus 40 is individually to constitute substantially samely other than the developer accommodated in development shell 41, respectively shape Yellowly (Y), pinkish red (M), blue (C), black (K) carbon dust picture.

The surface of the photoconductor drum 31 of rotation is charged by charged roller 33, and the sub-image being emitted from exposure device LH is utilized It forms light and forms electrostatic latent image.The electrostatic latent image being formed on photoconductor drum 31 is shown by the developer roll 42 as developing parts Shadow is at carbon dust picture.

Transfer device 50 includes: that will be formed by assorted carbon dust as multiple turn by the photoconductor drum 31 of each photo-conductor unit 30 The intermediate transfer belt 51 as middle transfer body of print；And assorted carbon dust picture will be formed by successively by each photo-conductor unit 30 Transfer the primary transfer roller 52 as primary transfer component in (primary transfer) to intermediate transfer belt 51.In turn, by will weigh The folded assorted carbon dust picture being transferred on intermediate transfer belt 51 transfers (secondary transfer printing) to as on the paper P of recording medium together Secondary transfer roller 53 as secondary transfer printing component is constituted.

The assorted carbon dust being formed on the photoconductor drum 31 of each photo-conductor unit 30 seems successively quiet by primary transfer roller 52 In electricity transfer (primary transfer) to intermediate transfer belt 51, and the overlapping carbon dust picture for making assorted carbon dust overlapping is formed, it is described once to turn Printing roller 52 is that the power supply device 13 etc. controlled from via controller 11 is applied with defined transfer voltage.

Carbon dust picture is overlapped with the movement of intermediate transfer belt 51 on intermediate transfer belt 51, and is transported to configured with secondary The region (secondary transfer section TR) of transfer roll 53.It is consistent with this opportunity when that will be overlapped carbon dust picture and transport to secondary transfer section TR And secondary transfer section TR is supplied in from paper feed 20 by paper P.Then, for secondary transfer roller 53, from 11 institute of via controller Power supply device 13 of control is equal apply as defined in transfer voltage, by the multiple toner picture on intermediate transfer belt 51 be transferred to together from On the paper P that resist printing roller is sent out and guided by conveying guiding element to 23.

The residual carbon dust on 31 surface of photoconductor drum is to be removed by cleaning blade 35, and be recycled to useless carbon dust receiving portion and (do not scheme Show) in.The surface of photoconductor drum 31 is charged again by charged roller 33.Moreover, not completely removed and attached by cleaning blade 35 Residue in charged roller 33 be that 34 surface of clearer rotated by contacting with charged roller 33 captures and accumulates.

Fixing device 60 has heating module 61 and compression module 62, crimps area by heating module 61 and compression module 62 Domain forms fusing nip portion N (fixing region).

Paper P in transfer device 50 transferred with carbon dust picture be carbon dust as it is unfixed in the state of, led via conveying Part and transport to fixing device 60.For being transported to the paper P of fixing device 60, a pair of of heating module 61 and compression molding are utilized Carbon dust picture is fixed by block 62 and the effect heated and crimped.The paper P for being formed with fixing carbon dust picture is by conveying guiding element 65a, 65b are guided, from the discharge tray 1a that discharge roller pair 69 is expelled to 1 upper surface of image forming apparatus.

In this way, in image forming apparatus 1, by from paper feed 20 via secondary transfer roller 53 to reaching discharge roller pair 69 Paper transport path is set as the structure of C-shape C-channel carrying channel, and the transport path of paper P is thus made to be formed most short, and As time i.e. for the first time print time (the first printout that can make since printing until exporting initial first Time, FPOT) minimize structure.

(2) fixing device

Fig. 2 is the schematic cross-section for indicating the structure of fixing device 60.

Fixing device 60 includes: the heating module 61 with heating roller 610 of an example as heating element；As pressurization The compression module 62 with press belt 620 of an example of component；The work that reduces temperature with the periphery face contact of heating roller 610 For the heat absorption roller 630 of an example of contact component；And make side of the roller 630 to contact or keep out of the way relative to heating roller 610 of absorbing heat (retract) mechanism part (not shown) is retracted in formula movement.

(2.1) heating module

Heating module 61 includes: what is contacted and heated with the paper P by fusing nip portion N is used as heating rotating body Heating roller 610；It is spaced apart with the inner peripheral surface of heating roller 610 and be configured at the inside of heating roller 610 as heater It is fixed lamp 611；And rotate heating roller 610 from driving portion (not shown) the rotatably driven power of image forming apparatus 1 Gear (not shown).

Heating roller 610 is both ends through open cylindrical member, is become using the slim pipe of made of metal as substrate, and in periphery Face overlaps to form the multilayered structure of the elastic layer comprising silicon rubber and the release layer containing fluororesin.

For heating roller 610, an example as temperature detecting component of the surface temperature configured with detecting heating roller 610 Thermistor(-ter) (thermistor) (not shown) and detect the temperature of heating roller 610 it is abnormal rise when block to fixing The thermostat 613 of an example as temperature detecting component of the energization of lamp 611.

(2.2) compression module

Compression module 62 has press belt 620 and pressing element 621 as endless belt, by pressing element 621 from inner circumferential Surface side pressurization, the press belt 620 being supported from inner peripheral surface side are forming fusing nip portion N with the contact portion of heating roller 610.

Pressing element 621 is configured at the inner peripheral surface side of press belt 620, and the outer peripheral surface of press belt 620 is pressed on heating roller 610 outer peripheral surface and pressurization.Moreover, the recess portion 621a of oriented fusing nip portion N opening is formed, in recess portion in pressing element 621 The pad component 622 comprising silicon rubber is fixed in 621a.

Moreover, pressing element 621 is that had by such as polyethylene terephthalate (PET), liquid crystal polymer (LCP) etc. The synthetic resin of heat resistance is formed.

Press belt 620 is band member of the both ends through open ring-shaped, is become by heat-resisting trees such as polyimides (PI) Rouge is formed as being formed with the release layer comprising fluororesin such as polytetrafluoroethylene (PTFE) (PTFE) on the surface with substrate of slim cylindrical shape Multilayered structure.

It is configured with plastic holding member 623 in the inner peripheral surface side of press belt 620, this holding member 623 is to adding 610 side opening of hot-rolling keeps the inner peripheral surface of press belt 620 in the region other than the fusing nip portion side N of press belt 620, and With heat resistance.In the outer peripheral surface opposite with the inner peripheral surface of press belt 620 of holding member 623, along the rotation of press belt 620 Direction and be formed with multiple flanks (not shown), inhibit the rising of rotational resistance caused by the contact of press belt 620.

Between the inner peripheral surface and pressing element 621 and pad component 622 of the press belt 620 of fusing nip portion N, configured with work For the slider (not shown) of the film structural component for sliding press belt 620.Slider is for example set to heat resistance height and rubs The low slim sheet element containing fluororesin such as polytetrafluoroethylene (PTFE) (PTFE) of coefficient.

Moreover, being configured with felt component 624 between holding member 623 and the inner peripheral surface of press belt 620.In felt component 624 Containing the silicone oil for being soaked with lubrication, silicon is supplied to the inner peripheral surface of press belt 620 while inner circumferential face contact with press belt 620 Oil inhibits the rising of the rotational resistance of press belt 620.

(2.3) absorb heat roller

About the heat absorption roller 630 of an example as contact component, become real to the surface of aluminum cylindrical tube as an example The structure of blasting treatment is applied, and is set on the direction of rotation of heating roller 610 compared with 613 upstream side of thermistor(-ter) or thermostat. Moreover, heat absorption roller 630 relative to the periphery face contact of heating roller 610 or can be left by the movement in back body portion, not It is left when use from the outer peripheral surface of heating roller 610.

Absorb heat roller 630 image forming apparatus 1 start and the heating module 61 of fixing device 60 it is heated when, be more than set Determine temperature and the outer peripheral surface of the heating roller 610 of excessive temperature rise contacts while driven rotation 1 week, thus inhibition heating roller 610 Circumferential temperature it is uneven.

For example, having in the outer peripheral surface of heating roller 610 with the region contacted paper P when paper P enters fusing nip portion N When the heat consumption caused by the fixing of carbon powder image and paper P heat absorption due to temperature reduce, produced in the circumferential direction of heating roller 610 Raw temperature is uneven, and the image after fixing generates gloss uneven.Therefore, absorb heat roller 630 with 1 week of the outer peripheral surface of heating roller 610 and Contact is rotated and is absorbed heat, and the circumferential temperature for thus reducing heating roller 610 is uneven, and the gloss of the carbon powder image after inhibiting fixing is not Equal generation.Moreover, being left behind heat absorption roller 630 and periphery face contact 1 week of heating roller 610 from the outer peripheral surface of heating roller 610.

(2.4) configuration of heat absorption roller, thermistor(-ter) and thermostat

Fig. 3 is the section for the fixing device 60 that the configuration of the heat absorption roller 630, thermostat 613 to the present embodiment is illustrated Schematic diagram, Fig. 4 (a)~Fig. 4 (c) are the fixing devices 60 for indicating an example of concrete configuration of heat absorption roller 630, thermostat 613 Schematic cross-section, Fig. 5 (a) and Fig. 5 (b) are the section signals for the fixing device being illustrated to the moving direction of heat absorption roller 630 Figure, Fig. 9 are the schematic cross-sections of the configuration of the heat absorption roller 630 in the fixing device 600 for indicate comparative example.

Roller 630 absorb heat as shown in figure 3, being configured at following positions (region R1 in Fig. 3), it may be assumed that contact with heating roller 610 In the state of, heat absorption roller 630 is underlapped above the vertical direction of heating roller 610 (Z-direction: the region R2 in Fig. 3), and is inhaling Hot-rolling 630 (is represented by dotted lines) in the state of leaving heating roller 610 in figure, and absorb heat the underlapped vertical in heating roller 610 of roller 630 Above direction (Z-direction: the region R2 in Fig. 3).

In present embodiment, the heating as heating element is overlapped in the heat absorption roller 630 for being configured as contact component Structure above the vertical of roller 610 is compared, and the excessive temperature for being able to suppress heat absorption roller 630 rises.

Hereinafter, the embodiment to present embodiment is illustrated together with comparative example.

(comparative example)

Fig. 9 indicates the fixing device 600 of this comparative example, is configured at following positions, it may be assumed that is contacted with heating roller 610 Under state, heat absorption roller 630 is overlapped in above the vertical direction of heating roller 610, and leaves the shape of heating roller 610 in heat absorption roller 630 Under state, heat absorption roller 630 is overlapped in above the vertical direction of heating roller 610.

As shown in figure 9, being configured to heat absorption roller 630 in fixing device 600 and being overlapped in above the vertical direction of heating roller 610 Position (region R1 in Fig. 9).In addition, heat absorption roller 630 can the periphery face contact with heating roller 610 contact position, with Leaving for leaving from the outer peripheral surface of heating roller 610 is left between position.

In this fixing device 600, the heat generated from heating roller 610 is as shown in figure 9, to (Z above the vertical of heating roller 610 Direction) diffusion (reference arrow h) in Fig. 9.As a result, the heat absorption roller 630 being configured above the vertical of heating roller 610 may be because upwards The heat that just spreads and heat up, reduced with the temperature difference of the outer peripheral surface of heating roller 610, from 610 periphery of heating roller of excessive temperature rise The effect of face heat absorption reduces.

(embodiment)

The image forming apparatus 1 of present embodiment as shown in Figure 1, be by from paper feed 20 via secondary transfer roller 53 to Reach discharge roller pair 69 paper transport path be set as C-shape C-channel carrying channel structure, in fixing device 60, heated mould Substantially horizontally opposite configuration, fusing nip portion N are formed in paper conveyance direction (in the X direction) for block 61 and compression module 62 In in vertical direction (Z-direction).

In the fixing device 60 being configured so that, heat absorption roller 630 is arranged in illustrated R1 in Fig. 3 as following positions Any place in region, it may be assumed that in the state of being contacted with heating roller 610, the underlapped vertical side in heating roller 610 of roller 630 of absorbing heat (region R2 in Fig. 3) upwards, and (be represented by dotted lines in Fig. 3) in the state that the roller 630 that absorbs heat leaves heating roller 610, it inhales Hot-rolling 630 is underlapped above the vertical direction of heating roller 610 (region R2 in Fig. 3).

Moreover, the thermistor(-ter) (not shown) and thermostat 613 as temperature detecting component be not also overlapped in heating roller 610 Vertical direction above (region R2 in Fig. 3) position, be configured at the rotation side of the heating roller 610 as fusing nip portion N Any place in the illustrated region R1 in Fig. 3 to the upstream side.

Specifically matching for the heat absorption roller 630 and thermostat 613 in fixing device 60 is indicated in Fig. 4 (a), Fig. 4 (b), Fig. 4 (c) An example set.

In fixing device 60 shown in Fig. 4 (a), heat absorption roller 630 is configured at the horizontal line relatively by the center of heating roller 610 H more on the lower (-Z direction), leaves direction also relative to heating roller 610 and becomes gravity direction in downward direction.

In fixing device 60 shown in Fig. 4 (b) and Fig. 4 (c), heat absorption roller 630 is configured at and relatively passes through compared with Fig. 4 (a) The horizontal line H at the center of heating roller 610 further more on the lower (-Z direction), leave direction also relative to heating roller 610 and As gravity direction further in downward direction.

Although the heat generated as a result, by heating roller 610 is as shown in Figure 3, the region to above the vertical of heating roller 610 (region R2 in Fig. 3) diffusion, but absorb heat roller 630 be arranged in compared with the center by heating roller 610 horizontal line H more on the lower Side's (-Z direction), thus it is not easily susceptible to the influence of heat spread above from heating roller 610 to vertical.Therefore, be configured to absorb heat The structure that roller 630 is overlapped in the comparative example above the vertical of heating roller 610 is compared, and the excessive temperature of heat absorption roller 630 is able to suppress Degree rises, and maintains the heat-absorbing action of heat absorption roller 630.

Moreover, thermistor(-ter) and thermostat be also configured at compared with the center by heating roller 610 horizontal line H more on the lower (- Z-direction), thus inhibit the influence of the heat spread above from heating roller 610 to vertical.

Roller 630 absorb heat when leaving from the outer peripheral surface of heating roller 610, as shown in Fig. 5 (a) and Fig. 5 (b), relative to heating Roller 610 and left to the lower section of gravity direction (-Z direction).For example, as in Fig. 5 (a) as an example shown in, when from heating roller When the state (in Fig. 5 (a) represented by dotted line) of 610 periphery face contact is retracted and left, to be moved to the lower section of gravity direction The mode of dynamic Lv is left.

Although as a result, the heat as caused by heating roller 610 as the arrow h in Fig. 5 (a) it is conceptual indicate, Xiang Jiare (region R2 in Fig. 5 (a)) is spread above the vertical of roller 610, but the roller 630 that absorbs heat is mobile to the lower section of gravity direction, so as to It is enough reliably suppressed mobile from heating roller 610 to the heat of heat absorption roller 630.

In turn, as in Fig. 5 (b) as an example shown in, about heat absorption roller 630 left from the outer peripheral surface of heating roller 610 away from From, with the mode bigger compared with the horizontal direction (Lh) relative to gravity direction relative to gravity direction in downward direction (Lv) from It opens.Thereby, it is possible to more reliably inhibit mobile from heating roller 610 to the heat of heat absorption roller 630.

(variation)

Fig. 6 is the schematic cross-section for indicating the internal structure of image forming apparatus 1A of variation, and Fig. 7 is to indicate variation Fixing device 60A schematic cross-section, Fig. 8 (a)~Fig. 8 (c) is the configuration example for indicating the fixing device in C-channel carrying channel Figure.

The fixing device 60A of variation is to be with the paper transport path from secondary transfer roller 53 to fixing device 60A Fixing device in the image forming apparatus 1A of the horizontal channel carrying channel of general horizontal direction, heating module 61 and compression module 62 substantially vertical (in z-direction) configure in opposite directions, fusing nip portion N is formed in the horizontal direction (side X in paper conveyance direction To) on.

Heat absorption roller 630 is arranged in any place in the region illustrated R1 in Fig. 7 as following positions, it may be assumed that with add In the state that hot-rolling 610 contacts, heat absorption roller 630 is underlapped above the vertical direction of heating roller 610 (region R2 in Fig. 7), And (be represented by dotted lines in Fig. 7) in the state that the roller 630 that absorbs heat leaves heating roller 610, heat absorption roller 630 is underlapped in heating roller Above 610 vertical direction (region R2 in Fig. 7).

Although the heat generated as a result, by heating roller 610 is as shown in Figure 7, the region to above the vertical of heating roller 610 (region R2 in Fig. 7) diffusion, but absorb heat roller 630 be arranged in compared with the center by heating roller 610 horizontal line H more on the lower Side's (-Z direction), thus it is not easily susceptible to the influence of heat spread above from heating roller 610 to vertical.

Therefore, compared with the structure for the comparative example being configured to above the vertical that heat absorption roller 630 is overlapped in heating roller 610, energy Enough excessive temperature for inhibiting heat absorption roller 630 rise, and maintain the heat-absorbing action of heat absorption roller 630.

On the other hand, for the fixing device 60A in horizontal channel, with the fixing device in C-channel carrying channel In the case that 60 compare, the underlapped region (region R1 in Fig. 7) above the vertical direction of heating roller 610 is narrower, fixed The upstream side of shadow nip portion N is configured as the thermistor(-ter) (not shown) of temperature detecting component and the region of thermostat 613 (in Fig. 7 The region R3) across fusing nip portion N become opposite side, thus be difficult to realize the space saving of fixing device 60A.

In other words, as shown in Fig. 8 (a)~Fig. 8 (c), in the fixing device 60 in C-channel carrying channel, to fusing nip portion N The path for transporting paper P is generally vertical direction (reference arrow P in Fig. 8 (a)~Fig. 8 (c)), the upstream side of fusing nip portion N The underlapped region (region R1 in Fig. 8 (a)~Fig. 8 (c)) above the vertical direction of heating roller 610 with it is shown in Fig. 7 The case where horizontal channel, is wide compared to more.

Therefore, can ground widely ensure in the circumferential direction (referring to the R1 in Fig. 8 (a)~Fig. 8 (c)) of heating roller 610 under State a position, it may be assumed that in the state that absorb heat roller 630 and heating roller 610 contact, heat absorption roller 630 is underlapped in heating roller 610 Above vertical direction, and in the state that the roller 630 that absorbs heat leaves from heating roller 610, heat absorption roller 630 is underlapped in heating roller 610 Vertical direction above.

As a result, it is possible to be configured in a neighboring manner in the circumferential direction of heating roller 610 (referring to R1 in Fig. 8 (a)~Fig. 8 (c)) Absorb heat roller 630 and thermistor(-ter) (not shown) and thermostat 613, to also can be realized the space saving of fixing device 60.

Moreover, " substantially vertical " in so-called C-channel carrying channel is following concepts, it may be assumed that not only include shown in Fig. 8 (a) Configuration, and the inclination of the degree including can get the effect the configuration example as shown in Fig. 8 (b), Fig. 8 (c).

In present embodiment, as heating element, overlapped to form to using the slim pipe of made of metal as substrate, and in outer peripheral surface There is the heating roller 610 of elastic layer and the release layer containing fluororesin comprising silicon rubber to be illustrated, but heating element is unlimited It can also be fixing belt in heating roller.At this point, press belt can be replaced as pressing member, and use in the outer of made of metal core material Circumferential surface lamination has silastic-layer and release layer and the pressure roller that constitutes.