CN101046667A - Fixing device and image forming apparatus including the same - Google Patents
Fixing device and image forming apparatus including the same Download PDFInfo
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- CN101046667A CN101046667A CN 200710086325 CN200710086325A CN101046667A CN 101046667 A CN101046667 A CN 101046667A CN 200710086325 CN200710086325 CN 200710086325 CN 200710086325 A CN200710086325 A CN 200710086325A CN 101046667 A CN101046667 A CN 101046667A
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Abstract
A fixer configured to fix an image on an recording medium passing through a fixing nip includes a holder including an elastic layer, a fixing rotator including a heating layer, provided overlying the holder, and a pressurizer configured to pressurize the holder via the fixing rotator to form the fixing nip. A part of the pressurizer, which forms the fixing nip, has a length not less than a length of the heating layer in a width direction perpendicular to a conveyance direction of the recording medium.
Description
Technical field
The electro-photographic image that the present invention relates to fixing device and comprise the image processing system, particularly fixing device of this fixing device and comprise this fixing device forms device.
Background technology
Usually, form device such as electro-photographic images such as duplicating machine, printer, facsimile recorders, include image and form mechanism, in order to image (as toner picture etc.) is formed on the recording medium (as page or leaf paper or ohp film paper), include fixing device, in order to toner as photographic fixing on recording medium.
For instance, fixing device can comprise heating source and pressure-producing part of a fixing member, heat fixer parts.Pressure-producing part is pushed into fixing member, thereby between forms the photographic fixing clamping.When recording medium during by the photographic fixing clamping, because of the heat that is subjected to fixing member and the pressure of pressure-producing part, the toner picture can be melted and photographic fixing on recording medium.Fixing member can be the roller of built-in thermal source, also can be the belt that is wrapped on the roller with built-in thermal source.As thermal source, can use the heat that is configured in around the heater block, produces by the halogen heating arrangement.
Above-mentioned thermal source can be closed when standby to save the energy.After image formed startup, thermal source was switched on, and in preheating time (start-up time), fixing member is heated to fixing temperature.In order to keep low power consumption to save the energy, fixing member preferably has the material of low heat capacity.
Fixing device can adopt induction heating mode to shorten preheating time and save energy consumption.For example, as shown in Figure 1, a kind of induction heating fixing device 101 includes a fixing roller 3, a backer roll 4 and an inductive coil 5.Fixing roller 3 comprises the bolster 1 that is positioned at its center and is wrapped in fixing rotating body 2 on the bolster 1.Backer roll 4 comprises metal mandrel 6 and surrounds the elastic layer 7 of metal mandrel 6.Backer roll 4 is pushed into fixing roller 3, thereby forms clamping n between two rollers.Inductive coil 5 with non-contacting mode be configured fixing roller 3 near.
Shown in Figure 2 is fixing roller 3 and the end view of backer roll 4 on its Width (direction of principal axis).Bolster 1 includes metal mandrel 1a and the elastic insulating layer 1b that twists on the metal mandrel 1a.By elastic insulating layer 1b, clamping n can have enough width to be used for photographic fixing.Fixing rotating body 2 includes induction heating layer 2a, elastic layer 2b and the release layer 2c outside from the lining.
When electric current seal was added on the inductive coil 5 (as shown in Figure 1), high frequency magnetic field can be sensed.2a has produced induction current near near the side the inductive coil 5 at the induction heating layer.So, the outer surface of fixing roller 3 can be heated by Joule heat.
By adjusting the vortex flow load on the fixing rotating body 2, can determine best input electric power.Fig. 3 has shown the relation between thermal value when frequency is 30kHz and the vortex flow load.The vortex flow load has been stipulated the heat generation characteristic of the heating layer of induction heating, and it is represented by following formula:
d＝vr/t
Wherein, d represents the vortex flow load, and vr is the volume impedance factor of heating layer, and t is the thickness of heating layer.
But when heating layer thickness during greater than skin depth δ, the thickness that magnetic flux can penetrate is littler than skin depth δ.In this case, the vortex flow load can be represented by following formula:
d＝vr/δ
Here, if be constant with k, ρ is an impedance factor, and μ is a relative permeability, and f is a frequency, and skin depth δ can be represented by following formula:
δ＝k(ρ/fμ)
1/2
Thus, near frequency is 30kHz, by induction heating by the induction heating layer 2a that the Low ESR coefficient material constitutes, the thickness of the induction heating layer 2a in the time of can obtaining vortex flow load for optimum value.The thickness of this induction heating layer 2a has only tens microns, and the thin sleeve halogen heating element that has the hundreds of micron than thickness is much thin.
But when adopting thin induction heating layer 2a, the also attenuation thereupon of fixing rotating body 2 thickness is because cross sectional moment of inertia is proportional with 3 powers of thickness, so along with the attenuation of fixing rotating body 2, physical strength (anti-flexural stiffness) will reduce.Flexural stiffness is represented with following formula:
Flexural stiffness=E * I
Wherein, E is a module of elasticity, and I is a cross sectional moment of inertia.
When fixing roller 3 that backer roll 4 is pushed into as shown in fig. 1, elastic deformation takes place in the elastic insulating layer 1b of bolster 1.Because the cause of the elasticity repulsion of elastic insulating layer, shown in double dot dash line among Fig. 2, at the two ends of fixing roller 3 Widths of arrow T indication bending has taken place, further, the shear stress of 2 li generations of fixing rotating body of cover tubular may destroy fixing rotating body 2.
In order to prevent this destruction, just be necessary to increase the thickness of fixing rotating body 2.Yet, increased the thickness of fixing rotating body 2, the elasticity of fixing rotating body will be reduced thereupon, thereby enough photographic fixing clamping n might be difficult to form.
Summary of the invention
As mentioned above, in one embodiment, fixing device is configured to image fixing on the recording medium by the photographic fixing clamping, it comprises the holding components with elastic layer, have the fixing rotating body of the heating layer that is arranged on holding components outside, and be configured to by fixing rotating body push holding components, in order to form the pressure-producing part of photographic fixing clamping.Form the part of photographic fixing clamping in the pressure-producing part, the length on its Width (promptly perpendicular to the recording medium direction of transfer) is not shorter than the length of heating layer.
Description of drawings
With reference to following to accompanying drawing detailed explanation can understand complete description to public technology and feature thereof faster and betterly.Wherein,
Fig. 1 is the figure that uses the fixing device of induction heating method in the prior art.
Fig. 2 is the end view of fixing roller and backer roll in the fixing device shown in Figure 1.
Fig. 3 shows the relation of vortex flow load and thermal value.
Fig. 4 is the diagrammatic cross-section of image processing system among the embodiment.
Fig. 5 is among the embodiment, the diagrammatic cross-section of the fixing device in the image processing system shown in Figure 4.
Fig. 6 A is the layer structural drawing of fixing roller holding components in the fixing device shown in Figure 5.
Fig. 6 B is the layer structure illustration of fixing rotating body in the fixing device shown in Figure 5.
Fig. 6 C is another layer structure illustration of fixing rotating body in the fixing device shown in Figure 5.
Fig. 7 is the end view of fixing roller and backer roll in the fixing device shown in Figure 5.
Fig. 8 is the fixing device figure among another embodiment.
Fig. 9 is holding components end, fixing rotating body and the backer roll figure in the fixing device shown in Figure 8.
Figure 10 is the fixing device figure among another embodiment.
Figure 11 is holding components end, fixing rotating body and the backer roll figure in the fixing device shown in Figure 10.
Figure 12 is in the fixing device shown in Figure 10, and the fixing rotating body end bumps against the constitutional diagram of sidewall and fracture.
Figure 13 is the part figure of fixing device among another embodiment.
Embodiment
In the explanation of first-selected as shown in the figure embodiment, for clarity sake used proprietary term.Yet open not being appreciated that of present specification is confined to employed proprietary term, but each concrete key element has all comprised all technical equivalents things that carries out similar operations.
As shown in the figure, identical reference marks is represented same or corresponding components among each figure, and the image processing system 100 in the existing inventive embodiments especially has been described in Fig. 4.
Shown in Figure 4 is the internal structure synoptic diagram of image processing system, and it can be duplicating machine, printer, scanning machine, facsimile recorder or multi-function device.Reader unit 200 is set at the topmost of image processing system 100.
Image processing system 100 can be the colour print device that tandem is arranged, and it comprises that 4 images form the station, is respectively image and forms the 10c of mechanism, 10m, 10y and 10b.Each image forms station 10c, 10m, 10y and 10b and all forms a cyan image, fuchsin image, yellow image or black image respectively, and comprises photoreceptor 11c, 11m, 11y and a 11b respectively.Image processing system 100 can also comprise 14, one intermediate transfer element 15 of a writing station and primary transfer roller 16c, 16m, 16y and 16b.Each primary transfer roller 16c, 16m, 16y and 16b are across intermediate transfer element 15, be configured on the position of photoreceptor 11c, 11m, 11y and 11b respectively.Image processing system 100 can also comprise a plurality of paper-feed rolls 20,21, one page or leaf paper of a plurality of pages of cartons transport path 23,24, one second transfer rolls 25 of a pair of contraposition roller, a pair of distributing roller 26 and a stacking dish 27.Image processing system 100 also comprises toner bottle 28c, 28m, 28y and 28b, secondary cleaning device 29, one fixing devices, 92, one commutations in 300, one duplex printing unit (switchback) path 93 and a return path 94.
Because image forms station 10c, 10m, 10y has identical configuration and function with 10b, except the different colours of administering the image that is used to be shaped, it is benchmark that the explanation of their configuration and function all forms station 10c with image.
Photoreceptor 11c is a drum type, rotates in a clockwise direction in Fig. 4.Image forms station 10c can also comprise a charging roller 12c and an image developing apparatus 13c.Along with the rotation of photoreceptor 11c, charging roller 12c charges to form homogeneous on its surface to its seal biasing voltage.
Intermediate transfer element 15 can be an endless belt, keeps when rotating with the imitative direction of inhour in Fig. 4 and the contacting of photoreceptor 11c, 11m, 11y and 11b.In the transfer printing first time, primary transfer roller 16c, 16m, 16y and 16b look like the toner on photoreceptor 11c, 11m, 11y and the 11b to be transferred on the intermediate transfer element 15 from cyan successively.Primary transfer roller 16c, 16m, 16y and 16b with toner image overlapping one by one after, form the image of full colors in intermediate transfer element 15.After the transfer printing first time, a cleaning device 17c goes to remove and initialization photoreceptor 11c.Photoreceptor 11m, 11y and 11b are also cleaned and initialization by corresponding cleaning device respectively.
Aforesaid image is in due course after forming, and a meeting in the paper-feed roll 20 is selected, and selecteed paper-feed roll 20 sends out the such recording medium of page or leaf paper P from corresponding paper bin through rotating.Page or leaf paper P is transferred along page or leaf paper transport path 23, is sandwiched between a pair of contraposition roller 24 up to its tip just to stop.
Contraposition roller 24 is through rotating, and P is delivered to the secondary transfer printing position with page or leaf paper, and similarly is to align synchronously with full-color on the intermediate transfer element 15.In the secondary transfer printing position, secondary transfer roller 25 is transferred to full-color image on page paper P.
Next, page or leaf paper upwards is transported to fixing device 300 places along page or leaf paper transport path 23.When page or leaf paper P when the fixing device 300, full-color image by photographic fixing to page or leaf paper P.After page or leaf paper P is discharged from by distributing roller 26, be deposited on the stacking dish 27 on image processing system 100 tops.
Toner bottle 28c provides cyan toner for image developing apparatus 13c.Similarly, toner bottle 28m, 28y and 28b are respectively the toner that corresponding image developing apparatus provides fuchsin, yellow or black.After secondary transfer printing, secondary cleaning device 29 goes to remove and initialization intermediate transfer element 15, for example, removes to remove residual toner on it.
When the two sides of page or leaf paper P all recorded image, on image (image) is recorded to first and after by fixing device 300 photographic fixing, by a switching pawl (not shown), a page or leaf paper P was transferred duplex printing unit 92.In the duplex printing unit 92 li, page or leaf paper P is transported to return path 94 after being reversed in commutation (switchback) path 93, make page or leaf paper P another side up, in intermediate transfer element 15, another image that will be recorded on second also forms.Page or leaf paper P is transferred secondary transfer roller 25, and there, second image is transferred on second of page paper P.After process fixing device 300, a page or leaf paper P is stacked on the stacking dish 27 by a pair of distributing roller 26.
Above though the image forming method of full-color image only has been described, white-black pattern and color mode can be selected.According to selected pattern, by selectively using at least one among image formation station 10c, 10m, 10y and the 10b, image processing system 100 can at random form black and white or coloured image.
The explanation of fixing device 300 can be with reference to Fig. 5.Fixing device 300 can comprise a fixing roller 30, backer roll 40, inductive coil 50, phase inverter 52, a control circuit 53 and a thermistor 54.
When fixing roller 30 rotated, backer roll 40 rotated thereupon.When electric current was added on the inductive coil 50 by seal, high frequency magnetic field was sensed generation.Because the magnetic field that changes produces induction current in fixing rotating body 33, the superficial layer of fixing roller 30 is promptly owing to Joule heat is heated.After fixing device 300 is finished preheating, can begin image and form, the image on the page or leaf paper P in by photographic fixing clamping n by photographic fixing.
With reference to Fig. 6 A, 6B and 6C, the fixing rotating body 33 of holding components 32 and fixing roller 30 is described.Fig. 6 A has shown the layer structure of holding components 32.Holding components 32 comprise a core metal rod 34 and be enclosed in core metal rod 34 outsides, the elastic insulating layer 35 of one deck at least.In an embodiment, elastic layer and insulation course integrator become elastic insulating layer 35.As selection, elastic insulating layer 35 also can be made up of elastic layer and insulation course dividually.Elastic insulating layer 35 comprises such as the such foamed material of inflation silicones, and/or elastic caoutchouc.Constitute by above-mentioned material, elastic insulating layer 35 can form the photographic fixing clamping with required width with desirable rigidity.Also have, elastic insulating layer 35 has insulation function, and it can reduce the start-up time of thermal capacity and photographic fixing.
Fig. 6 B is the layer structural drawing in the fixing rotating body 33.Fixing rotating body 33 comprises an induction heating layer 36 as heating layer, an elastomer layer 37 and a release layer 38.Elastomer layer 37 is positioned at the outside surface of induction heating layer 36, and release layer 38 is formed on the elastomer layer 37, and induction heating layer 36 comprises metal material, and the volume impedance factor of metal is not more than 3.0 * 10
-8Ω m when the vortex flow load of fixing rotating body 33 is the best, can further reduce the thickness of induction heating layer 36.Metal material can have been enumerated silver, copper and aluminium.Also has copper facing in addition.
Its result, the thermal capacity of fixing rotating body 33 can be reduced, thereby makes it more effectively to generate heat.The thickness of desired induction heating layer 36 is not more than 100 μ m.
The thickness of elastomer layer 37 can be at 1mm, and is perhaps littler.At photographic fixing clamping n place, backer roll 40 contacts equably with the release layer 38 of fixing rotating body 33.So, the reduction of thermal conductivity can be prevented or reduce, and the uneven lustre that page paper P goes up transferred image can be prevented or reduce.
What Fig. 6 C showed is in one embodiment, and its inboard includes the fixing rotating body 33a of substrate 39.Substrate 39 is made of non-magnetic stainless steel layer or polyimide layer.Induction heating layer 36, elastomer layer 37 and release layer 38 etc. are formed in the substrate 39 successively.Because desired substrate 39 thickness add the thickness of induction heating layer 36 and are not more than 100 μ m, so the flexural stiffness of fixing rotating body 33a can be not excessive.Under this thickness, photographic fixing clamping n can access effective formation.
Have the holding components 32 of elastic insulating layer 35 and have the fixing rotating body 33 of responding to heat generating components 36 and can be formed respectively.Fixing rotating body 33 can be set at the outside surface of holding components 32, also can be whole or in part with holding components 32 gluings to form whole roller.When fixing roller 30 is made thus, when rotating as being noted that in the back, fixing rotating body 33 can not move a side that is biased on its Width on the holding components 32, so, can prevent or reduce the damage at the two ends of fixing rotating body 33 on its Width.
Shown in Figure 7, be end as fixing roller 30 on Width shown in the arrow T (direction of principal axis) and backer roll 40, wherein, Width is perpendicular to page or leaf paper direction of transfer.
In Fig. 7, the length of length L 1 expression backer roll 40 on photographic fixing clamping N Width, L2 represents the length of elastic insulator 35 and induction heating layer 36.In an embodiment, as shown in Figure 7, length L 1 can be greater than length L 2.When backer roll 40 is pushed into holding components 32 by fixing rotating body 33, can produce elasticity repulsion in the elastic insulating layer 35.Elasticity repulsion on whole induction heating layer 36 width can be accepted by pressurized roller 40.Though shown in Figure 7 be L1 greater than L2, in fact L1 equals L2's substantially.
When electric current is added on the inductive coil 50 by seal, magnetic field sensed after (Fig. 5), the inductive coil 50 that is positioned at 33 li of fixing rotating bodies induction heating layer, 36 1 sides can produce induction currents.Thereby the superficial layer of fixing roller 30 can be heated because of Joule heat.
Because metal is included in 36 li of induction heating layers, induction heating layer 36 thickness when the vortex flow load of fixing rotating body 33 is optimum value can be reduced, and the thermal capacity of fixing rotating body 33 also can obtain reducing.Further be, formed enough photographic fixing clamping N, and the shear stress that produces in the induction heating layer 36 is also few, this can prevent or reduce the damage of fixing rotating body 33 at Width two ends shown in the arrow T.
Shown in Figure 8 is among the embodiment, is installed in the fixing device 300a of 100 li of image processing systems.Fixing device 300a comprises a photographic fixing part 30a, backer roll 40a, inductive coil 50, phase inverter 52, a control circuit 53 and a thermistor 54.Photographic fixing part 30a comprises a roller shape holding components 32, a fixing rotating body 33b, a cover tubular roller 60 and an idler roller 61.Fixing rotating body 33b is flexible endless belt.Holding components 32 and fixing rotating body 33b can be formed respectively.The fixing rotating body 33b that holding components 32, roller 60 and idler roller 61 are set up around quilt as a plurality of support units.Idler roller 61 pushes fixing rotating body 33b from inboard face, thereby makes fixing rotating body 33b be in tensioning state.
As fixing roller shown in Figure 5 30, holding components 32 comprises the elastic insulating layer 35 of core metal rod 34 and package core metal rod 34.By fixing rotating body 33b, backer roll 40a is pushed into holding components 32, thereby forms photographic fixing clamping N between backer roll 40a and fixing rotating body 33b.By fixing rotating body 33b, inductive coil 50 is covered with the roller 60 about half.Inductive coil 50 can be connected with the phase inverter 52 that is connected with control circuit 53.Thermistor 54 with signal conveys to control circuit 53.
As backer roll shown in Figure 5 40, backer roll 40a comprises a core metal rod 42 and centers on the rubber layer 43 of core metal rod 42.Backer roll 40a also comprises a built-in well heater 44.By well heater 44, can shorten the start-up time of photographic fixing.The consumption because well heater 44 can increase electric power is so just not necessarily need well heater 44 when emphasizing conservation of power.
Cause that when the rotation of holding components 32 fixing rotating body 33b also rotated thereupon when roller 60 and idler roller 61 rotated.When electric current is added on the inductive coil 50 by seal, can respond to the generation high frequency magnetic field.Magnetic field can cause induction current in fixing rotating body 33b.Thus, the superficial layer of fixing rotating body 33b can be heated by Joule heat.After the preheating of fixing device 300a was finished, image formed and can begin, the image on the page or leaf paper P page or leaf paper during by photographic fixing clamping N by photographic fixing.
The end of holding components 32, fixing rotating body 33b and the backer roll 40a of Fig. 9 display width direction (direction of principal axis) shown in arrow T.This Width is perpendicular to page or leaf paper direction of transfer.
As shown in Figure 9, fixing rotating body 33b comprises the substrate 39 on its medial surface.As the fixing rotating body 33a shown in Fig. 6 C, in substrate 39, be formed with induction 36, one elastomer layers 37 of heating layer and a release layer 38 successively.For example, substrate 39 comprises a non-magnetic stainless steel layer with high resiliency modulus (elastic modulus), and its thickness is 100 μ m or littler.As selection, substrate 39 also can be that thickness is 300 μ m or thinner polyimide.By aforesaid substrate 39, in desired scope, the flexural stiffness of fixing rotating body 33b obtains increasing.Further be that fixing rotating body 33b can be enhanced in the permanance of the anti-cyclic stress in photographic fixing clamping N place.
In Fig. 9, L1 represents the length of photographic fixing clamping N place along the backer roll 40a of arrow T direction, and L2 represents the length of elastic insulating layer 35 and induction heating layer 36.In an embodiment, length L 1 can be greater than L2.When backer roll 40a is pushed into holding components 32 by fixing rotating body 33b, can produce elasticity repulsion in the elastic insulating layer 35.Backer roll 40a can accept the elasticity repulsion of the induction heating layer 36 in the full width.Though shown in Fig. 9 be length L 1 greater than L2, in fact L1 is to equate substantially with L2.
When the electric current seal was added on the inductive coil 50, magnetic field meeting sensed (Fig. 8) can produce induction current for 50 li by the inductive coil of responding to heating layer 36 1 sides among the fixing rotating body 33b, and thus, the superficial layer of fixing rotating body 33b is heated by Joule heat.
Because metal is comprised in 36 li of induction heating layers, the thickness of the induction heating layer 36 when the vortex flow load of fixing rotating body 33b is optimum value obtains reducing, and the thermal capacity of fixing rotating body 33b also obtains reducing.Further be, formed enough photographic fixing clamping N, and the generation of shear stress is also few in the induction heating layer 36, so can prevent or reduce the two ends of fixing rotating body 33b on Width (among Fig. 9 shown in the arrow T) and damage.
Among the embodiment, the support unit (as holding components 32, roller 60 and idler roller 61 etc.) that centers on the fixing rotating body 33b that is set up is a roller shown in Figure 8.Support unit can be roller, pad or their bond.Though the rotation of holding components 32 can cause the rotation of fixing rotating body 33b, another also can make fixing rotating body 33b rotate around the roller shape parts that set up fixing rotating body 33b.As selection, backer roll 40a also can make fixing rotating body 33b rotate, and also can use the cushion pressure-producing part to substitute backer roll 40a.
Shown in Figure 10 is fixing device 300b among the embodiment.Fixing device 300b comprises a fixing member 30b, a backer roll 40 and an inductive coil 50.Fixing member 30b comprises holding components 32a and the fixing rotating body 33c that is formed separately.Holding components 32a can be a pad.Fixing rotating body 33c is flexible, ring-shaped sleeve.Fixing rotating body 33c is set up around holding components 32a.Holding components 32a comprises substrate 34a and the elastic insulating layer above the substrate 34a 35.
Backer roll 40 is pushed into holding components 32a by fixing rotating body 33c, in order to form photographic fixing clamping N between backer roll 40 and fixing rotating body 33c.Page or leaf paper P shown in Figure 10 arrow direction by photographic fixing clamping N.Inductive coil 50 has covered part fixing rotating body 33c.Backer roll 40 comprises a core metal rod 42 and centers on the rubber layer 43 of core metal rod 42.
Though do not illustrate, as fixing device shown in Figure 5 300, inductive coil 50 is connected with the phase inverter that is connected with control circuit.Still similarly, thermistor with signal conveys to control circuit.
When backer roll 40 rotated, fixing rotating body 33c also rotated thereupon.When circuit is added on the inductive coil 50 by seal, can induce high frequency magnetic field.This magnetic field can produce induction current in fixing rotating body 33c.So, the superficial layer of fixing rotating body 33c is able to be heated by Joule heat.After the preheating of fixing device 300b is finished, can begin the formation of image, the image on the page or leaf paper P by photographic fixing clamping N the time by photographic fixing.
Figure 11 shows shown in the arrow T, holding components 32a, fixing rotating body 33c and backer roll 40 end of (direction of principal axis) on Width.This Width is perpendicular to the throughput direction of page or leaf paper.Fixing device 300b can also comprise pair of side plates 65, in order to hide the ends on Width such as holding components 32a, fixing rotating body 33c and backer roll 40.
As shown in figure 11, identical with fixing rotating body 33a among Fig. 6 C, cannula-like fixing rotating body 33c comprises a substrate 39, one inductions, 36, one elastomer layers 37 of heating layer and a release layer 38.For example, substrate 39 comprises a non-magnetic stainless steel layer with high elastic modulus, and its thickness is 100 μ m or littler.As selection, it is 300 μ m or thinner polyimide material that substrate 39 also can be adopted thickness.Also can between holding components 32a and fixing rotating body 33c, adopt as required such as the low material of friction factor such as oil or grease.
In fixing device 300b, L1 represents the length of backer roll 40 on the arrow T direction at photographic fixing clamping N place.Though Figure 11 shown fixing rotating body 33c turn to a side, its end on the direction shown in the arrow T from holding components 32a end the state when outstanding, induction heating layer 36 is still identical with the length of elastic insulating layer 35, represents with L2.
Among the embodiment, length L 1 is identical substantially with L2 or is longer than L2's.When backer roll 40 is pushed into holding components 32a by fixing rotating body 33c, can produce elasticity repulsion in the elastic insulating layer 35.Backer roll 40 can accept to respond to the elasticity repulsion of heating layer 36 on whole induction heating layer 36 width.
When electric current was added on the inductive coil 50 by seal, magnetic field promptly sensed (Figure 10) produced induction current in the inductive coil 50 by induction heating layer 36 1 sides among the fixing rotating body 33c, and the superficial layer of fixing rotating body 33c can be heated by Joule heat thus.
Because metal is comprised in 36 li of induction heating layers, induction heating layer 36 thickness when the vortex flow load of fixing rotating body 33c is optimum value are reduced, and the thermal capacity of fixing rotating body 33c also can obtain reducing.Also have, can form enough photographic fixing clamping N, and reduce the shear stress that occurs in the induction heating layer 36.Thus, the physical strength of fixing rotating body 33c on Width (arrow T) is enhanced, thereby can prevent or reduce the end damage of fixing rotating body 33c on Width.
In the above example, when backer roll 40 was the rotation of pressure-producing part, the fixing rotating body 33c that is set up around holding components 32a can rotate thereupon.As selection, holding components 32a can be the roller shape, and when it rotated, fixing rotating body 33c also rotated thereupon.When holding components 32a was the roller shape, the shape of pressure-producing part also can be a cushion, and roller shape not necessarily.
When fixing rotating body is a endless belt among Fig. 8, or the sleeve pipe among Figure 10 and when the holding components that is formed separately with fixing rotating body was set up, fixing rotating body can move to a side of holding components Width when rotating.
If as shown in figure 11, when the fixing rotating body 33c that turns to Width (arrow T) side bumped against sidewall 65, end wherein may be damaged.Figure 12 shows when fixing rotating body 33c bumps against sidewall 65, the situation the when end 66 of fixing rotating body 33c is damaged.
Shown in Figure 13 is fixing device 300c among the embodiment.Fixing device 300c comprises a holding components 32a, fixing rotating body 33c, backer roll 40 and pair of sidewalls 65.Remove outside a pair of limiting component that is arranged at fixing rotating body 33c end, the structure of fixing device 300c and Figure 10, fixing device 300b shown in Figure 11 is identical.Fixing rotating body 33c can be ring-type, flexible material, also can be pad or the roller that is set up around holding components 32a.As shown in figure 13, the length of holding components 32a is less than the length of fixing rotating body 33c on arrow T direction, and the limiting component 68 on the fixing rotating body 33c both ends can be added in additional space.
Limiting component 68 is made of fire resistant resin.During rotation, when fixing rotating body 33c moved to arrow T direction one side on the holding components 32a, a meeting in the limiting component 68 contacted with the end surface of holding components 32a.Limiting component 68 can prevent fixing rotating body 33c excessively moving and damage sidewall 65 to a side.So, the end of fixing rotating body c is damaged and is prevented.
The basis of present patent application and priority request be on March 13rd, 2006, at the Japanese patent application JP2006-067386 of Jap.P. office application, and the Japanese patent application JP2006-283310 on October 18th, 2006, its full content draws the do combination at this.
From the above many improvement and variation can also be arranged.That is within the scope of the claims, the disclosure of this patent specification is not limited to above-mentioned explanation.
Claims (19)
1. fixing device, it is set to image fixing on the recording medium by the photographic fixing clamping, and it comprises:
Holding components, it comprises elastic layer;
Fixing rotating body, it comprises the heating layer that is configured in described holding components outside; With
Pressure-producing part, it is set to be urged to described holding components by described fixing rotating body, to form the photographic fixing clamping;
It is characterized in that comprising:
Form the length of the described pressure-producing part part of described photographic fixing clamping, be not less than described heating layer perpendicular to the length on the Width of recording medium throughput direction.
2. fixing device according to claim 1 is characterized in that comprising:
Described heating layer includes metal, and its volume impedance factor is not more than 3.0 * 10
-8Ω m.
3. fixing device according to claim 1 is characterized in that comprising:
The thickness of described heating layer is not more than 100 μ m.
4. fixing device according to claim 1 is characterized in that comprising:
Described fixing rotating body also comprises a substrate, and described heating layer is formed in the described substrate.
5. fixing device according to claim 4 is characterized in that comprising:
The thickness that comprises the described heating layer of described substrate is not more than 100 μ m.
6. fixing device according to claim 4 is characterized in that comprising:
Described substrate is made of non-magnetic stainless steel, and its thickness is not more than 100 μ m.
7. fixing device according to claim 4 is characterized in that comprising:
Described substrate is made of polyimide, and its thickness is not more than 300 μ m.
8. fixing device according to claim 1 is characterized in that comprising:
Described elastic layer is made of expanded material.
9. fixing device according to claim 1 is characterized in that comprising:
Described elastic layer is made of elastic caoutchouc.
10. fixing device according to claim 1 is characterized in that comprising:
Described fixing rotating body also comprises:
Elastomer layer, it is positioned at described heating layer outside, and its thickness is not more than 1mm; With
Release layer, it is positioned at the outside of described elastomer layer.
11. fixing device according to claim 1 is characterized in that comprising:
Become the roller shape after described holding components and described fixing rotating body are combined as a whole, it forms fixing roller.
12. fixing device according to claim 1 is characterized in that comprising:
Described fixing rotating body by gluing to described holding components.
13. fixing device according to claim 1 is characterized in that comprising:
Described holding components or roller, or pad, described fixing rotating body is made of the ring-type bendable material, and it is set up around described holding components.
14. fixing device according to claim 13 also comprises a plurality of support units;
It is characterized in that comprising:
Described fixing rotating body is an endless belt, and it is around comprising that a plurality of support units of described holding components are set up.
15. fixing device according to claim 14 is characterized in that comprising:
Described support unit is roller, pad or their bond.
16. fixing device according to claim 13 is characterized in that comprising:
Described fixing rotating body is a ring-shaped sleeve, and it is set up around described holding components.
17. fixing device according to claim 13 also comprises:
Low-friction material, its between described fixing rotating body and described holding components,
It is characterized in that comprising:
Described fixing device is set to rotate with the rotation of described pressure-producing part.
18. fixing device according to claim 13 also comprises:
A pair of limiting component, it is positioned at the two ends of described fixing rotating body on Width,
It is characterized in that comprising:
Each described limiting component all is set for, and prevents when described fixing rotating body from rotating amesiality and touch the end surface of described holding components.
19. an image processing system is characterized in that comprising:
Photoreceptor;
Charging device, it carries out charged to described photoreceptor;
Irradiation unit, it shines described photoreceptor, thereby forms electrostatic latent image thereon;
Image developing apparatus, it uses toner described electrostatic latent image that develops, thereby forms toner image;
Transfer device, it is transferred to described toner image on the recording medium; With
Fixing device according to claim 1, its with toner image on recording medium.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006067386 | 2006-03-13 | ||
| JP067386/06 | 2006-03-13 | ||
| JP283310/06 | 2006-10-18 |
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| Publication Number | Publication Date |
|---|---|
| CN101046667A true CN101046667A (en) | 2007-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710086325 Pending CN101046667A (en) | 2006-03-13 | 2007-03-13 | Fixing device and image forming apparatus including the same |
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| Country | Link |
|---|---|
| CN (1) | CN101046667A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576206A (en) * | 2009-09-30 | 2012-07-11 | 佳能株式会社 | Endless metal belt, endless belt for use in electrophotography, fixing device, and electrophotographic image-forming device |
-
2007
- 2007-03-13 CN CN 200710086325 patent/CN101046667A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576206A (en) * | 2009-09-30 | 2012-07-11 | 佳能株式会社 | Endless metal belt, endless belt for use in electrophotography, fixing device, and electrophotographic image-forming device |
| CN102576206B (en) * | 2009-09-30 | 2015-01-07 | 佳能株式会社 | Endless metal belt, endless belt for use in electrophotography, fixing device, and electrophotographic image-forming device |
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