CN100538548C - The device that is used for fusing toner on print media - Google Patents
The device that is used for fusing toner on print media Download PDFInfo
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- CN100538548C CN100538548C CNB2005101098262A CN200510109826A CN100538548C CN 100538548 C CN100538548 C CN 100538548C CN B2005101098262 A CNB2005101098262 A CN B2005101098262A CN 200510109826 A CN200510109826 A CN 200510109826A CN 100538548 C CN100538548 C CN 100538548C
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Abstract
The invention provides a kind of by using the induction current heating calandria that produces by transformer to be used on paper the photographic fixing predetermined toner image and with the calandria of fixation unit and the device of power supply unit electrical isolation.Described fixing device comprise be used in response to alternating current produce faradic insulation unit, by the calandria of the induction current that produced heating, use the heat that receives from calandria in the toner fixing unit of fusing toner image on the paper and use predetermined enlargement of pipe pressure with the enlargement of pipe attachment portion of described calandria close attachment to the described toner fixing unit.
Description
Technical field
The present invention relates to a kind of device that is used for photographic fixing on paper (fuse) predetermined toner image.Particularly, the present invention relates to a kind of fixing device, the wherein calandria of fixation unit and power supply unit electrical isolation, and wherein said calandria uses the induction current that is produced by transformer to heat.
Background technology
Traditional image printing device comprises to toner and applies predetermined pressure and the heat fixing device with photographic fixing predetermined toner image on paper.This fixing device comprises to toner and applies the fixation unit of predetermined amount of heat and apply the pressurizer of predetermined pressure to toner.This fixation unit further comprises producing and is used at the calandria of the heat of fusing toner image on the paper and will be by heat transferred that calandria the produced fixing roller to the paper.
Fig. 1 uses the schematic section of Halogen lamp LED as the side plane intercepting of traditional fixation unit 10 of the fixing device of thermal source along passing.With reference to Fig. 1, fixation unit 10 comprises fixing roller 11 and calandria 12, and this calandria 12 comprises the Halogen lamp LED that is installed in fixation unit 10 centers.The coating 11a that is made by special teflon forms on the surface of fixing roller 11.Calandria 12 produces heat, and the radiations heat energy that fixing roller 11 is sent from calandria 12 heats.
In using the traditional fixation unit of Halogen lamp LED, arrive the target fixing temperature after the fixation unit power supply, needing a preheating time as thermal source.This preheating time scope from several seconds to a few minutes.Thereby when print image, the user need wait for so long preheating time.
In using the traditional fixation unit of Halogen lamp LED as thermal source, in order to reduce preheating time, even when not carrying out printing, the temperature of fixing roller also will remain on more than the room temperature in the time at scheduled volume.Thereby cause unnecessary energy charge.
Therefore, needing can be fast and the system and method that heat is provided for the running of fixation unit effectively.
Summary of the invention
The present invention has solved above-mentioned and other problem basically, and provides a kind of and be used for by heating calandria so that with the device of toner image on paper by insulation eddy current that the unit produced.
The present invention also provides a kind of fixation unit with thin dielectric layer, and this thin dielectric layer is used for power supply unit and calandria are electrically insulated from each other.
The present invention also provides a kind of fixing device of preheating fixation unit at short notice that is used for.
According to an aspect of the present invention, a kind of heating arrangement that is used for the fixation unit of toner image on paper is provided, and this heating arrangement comprises the power supply unit that is used to supply predetermined alternating current, be used for the calandria that produces faradic insulation unit and carried out resistance heated by induction current in response to alternating current.
Described insulation unit can constitute by produce faradic transformer in response to alternating current.
According to a further aspect in the invention, provide a kind of for being used for supply unit with the fixation unit power supply of toner image on paper, this supply unit comprises the power supply unit that is used to supply predetermined alternating current, and is used for producing induction current and the induction current that is produced being supplied to the insulation unit of fixation unit in response to alternating current.
Described insulation unit can constitute by produce faradic transformer in response to alternating current.
This device further comprises the rectifier that is used to produce DC current by the rectification alternating current, and is used for producing alternating current and the alternating current that is produced being supplied to the alternating current generator of described insulation unit from described DC current.
According to a further aspect in the invention, providing a kind of is used for the unit of toner image on paper, this unit comprises well heater and toner fixing unit, wherein, the predetermined induction current of the described well heater of resistance heated imposes on above-mentioned well heater, above-mentioned toner fixing unit use the heat that receives from this well heater with toner image on paper.
Described unit may further include the insulation course with calandria and toner fixing unit electrical isolation, and wherein the withstand voltage of first insulation course can be equal to or less than 1kV.
According to a further aspect in the invention, providing a kind of is used for the device of toner image on paper, this device comprises power supply unit and fixation unit, wherein predetermined alternating current imports above-mentioned power supply unit and this power supply unit produces first induction current in response to the input AC electric current, above-mentioned fixation unit by first induction current carry out resistance heated and induction heating and heat that use produced with toner image on paper.
Described fixation unit can comprise the heat that is carried out the calandria of resistance heated and be received from calandria by use by first induction current with the toner fixing unit of toner image on paper, and wherein the withstand voltage of insulation course can be equal to or less than 1kV.
Described calandria can further produce second induction current by first induction current in the toner fixing unit, wherein said toner fixing unit by the calandria that causes by first induction current resistance heated and the induction heating of the toner fixing unit that causes by second induction current heat.
Description of drawings
Describe exemplary embodiment of the present invention in detail by the reference accompanying drawing, above-mentioned and others of the present invention and advantage will become more obvious, in the accompanying drawing:
Fig. 1 is along passing the cross-sectional view of traditional use Halogen lamp LED as the side plane intercepting of the fixation unit of the fixing device of thermal source;
Fig. 2 is the functional block diagram that is used for the fixing device of heat fixer unit;
Fig. 3 A is the cross-sectional view along the side plane intercepting of passing fixation unit shown in Figure 2;
Fig. 3 B is the detail drawing of the well heater of fixation unit shown in Fig. 3 A;
Fig. 4 is the functional block diagram according to the fixing device of the embodiment of the invention;
Fig. 5 is the functional block diagram of fixing device according to another embodiment of the present invention;
Fig. 6 A is the cross-sectional view along the side plane intercepting of passing the fixation unit that uses in the fixing device shown in Fig. 4 or 5;
Fig. 6 B is the detail drawing of the well heater of the fixation unit shown in Fig. 6 A;
Fig. 7 is the detail drawing of the fixation unit that uses in the fixing device shown in Fig. 4 or 5;
Fig. 8 A and 8B are the pictures that following state is shown: according to embodiments of the invention, the well heater of the fixation unit that uses in the fixing device shown in Fig. 4 or 5, fixing roller and enlargement of pipe attachment portion be close attachment each other; And
Fig. 9 illustrates relatively to use Halogen lamp LED as the fixation unit of thermal source with according to embodiment of the invention fixing roller and the well heater chart of the experimental data of the preheating time of the fixation unit of close attachment each other wherein.
All in the accompanying drawing, same reference numerals is interpreted as referring to identical parts, assembly and structure.
Embodiment
Fig. 2 is the functional block diagram that is used for the fixing device of heat fixing roll.With reference to Fig. 2, this fixing device comprises power supply unit 210, line filter (line filter) 220, conductive switch 230 and fixation unit 240.Power supply unit 210 supply alternating currents (AC), line filter 220 is removed the harmonic wave that causes noise among the AC.The electric current of fixation unit 240 is supplied or be cut to conductive switch 230, and wherein harmonic wave is removed by line filter 220.Fixation unit 240 comprises well heater 250 and fixing roller (not shown).Well heater 250 comprises heater coil (not shown) and the insulation course (not shown) that is used for fixing roller and heater coil insulation.Hereinafter with reference to Fig. 3 A and 3B fixation unit 240 is described in more detail.Heater coil heats with resistance heat by the AC of line filter 220 supplies.The heat that is produced by heater coil is sent to fixing roller via insulation course, and when paper during through fixing roller, fixing roller melt toner and with toner image on paper.
Fig. 3 A is that wherein well heater 250 close attachment are to fixing roller along the cross-sectional view of the side plane intercepting of passing fixation unit 240, and Fig. 3 B is the detail drawing of the well heater 250 of the fixation unit 240 shown in Fig. 3 A.With reference to Fig. 3 A and Fig. 3 B, fixation unit 240 comprises: fixing roller 320 forms the protective seam 310 that the surface applies through special teflon on it; Tubulose and enlargement of pipe attachment portion 350 with opened end portions, it is arranged on 320 inside, toner fixing unit; And be installed in well heater 250 between fixing roller 320 and the enlargement of pipe attachment portion 350.Well heater 250 comprises heater coil 360, its with helix shape on enlargement of pipe attachment portion 350, and by input produces heat from the electric current of external power source unit; And insulation course 330 and 340, it makes when electric current input heater coil 360 around heater coil 360 and with enlargement of pipe attachment portion 350 and fixing roller 320 and heater coil 360 insulation, dielectric breakdown can not take place and do not have leakage current.
Insulation course comprise be inserted in first insulation course 330 between fixing roller 320 and the heater coil 360 and be inserted in heater coil 360 and enlargement of pipe attachment portion 350 between second insulation course 340.
This first and second insulation course 330 and 340 can be made of MgO sheet or glass sheet.The heat that heater coil 360 produces arrives fixing roller 320 and enlargement of pipe attachment portion 350 by first insulation course 330 and second insulation course 340 respectively.
Insulation course 330 and 340 preferably should have withstand voltage and the anti-electric breakdown feature that manufacturer's standard that each country of using this device assert and other prescribed by standard are asked.The withstand voltage feature is product or the material characteristics that reflection product or material can tolerate the predetermined external voltage that is applied, and anti-electric breakdown feature to be reflection product or material do not produce 10mA or bigger leakage current and the feature of electric breakdown does not take place in one minute in maximum withstand voltage.The different withstand voltage between fixing roller 320 and the heater coil 360 has been stipulated in the safety standard requirement of country variant.In order to satisfy desired withstand voltage, first insulation course 330 and second insulation course 340 preferably are inserted between fixing roller 320 and the enlargement of pipe attachment portion 350.
Fig. 3 B is the part A shown in Fig. 3 A, i.e. the more detailed diagrammatic sketch of the well heater 250 of fixation unit 240.When between fixing roller 320 and heater coil 360 require withstand voltage to be 6kV the time, first insulation course 330 preferably should comprise three mica sheet 330a, 330b and 330c, each has the thickness of about 0.18mm.Yet because the thickness of the insulation course that inserts between fixing roller 320 and the heater coil 360 increases, the heat that is sent to fixing roller 320 reduces.
Fig. 4 is the functional block diagram according to the fixing device of the embodiment of the invention.The fixing device of Fig. 4 comprises power supply unit 410, line filter 420, rectifier 430, AC signal generator 440, insulation unit 450 and has the fixation unit 460 of well heater 470.Hereinafter with reference to Fig. 6 A and 6B fixation unit 460 shown in Figure 4 is described in more detail.The AC signal that power supply unit 410 supplies have predetermined amplitude and frequency.Line filter 420 comprises inductance L 1 and capacitor C 1, and its removal is included in from the harmonic component in the AC signal input of power supply unit 410.For illustrational purpose, line filter 420 illustrates as one type line filter (LC wave filter) in exemplary embodiment of the present invention.The line filter that can use other type is as line filter 420, and and do not deviating from scope of the present invention.
Produce the AC signal in the DC signal of always free rectifier 430 supplies of AC generator 440.AC generator 440 comprises two capacitor C2 and C3 and two switch SW 1 and SW2, and closed and DC conversion of signals that will be obtained by rectifier 430 rectifications is the AC signal by switching on and off switch SW 1 and SW2.AC generator 440 produces high frequency or low-frequency ac signal according to the application scenario of fixing device by receiving the DC signal that is produced by rectifier 430.The AC generator that can use other type is as AC generator 440, and do not depart from the scope of the present invention.
When the AC signal flow is crossed the main coil 452 of transformer 450, the changes of magnetic field around the secondary coil 454, and the magnetic field of passing through to change produces induction current in secondary coil 454.After this, the induction current that is produced by transformer 450 will be called first induction current.First induction current that is produced by transformer 450 is supplied to well heater 470.The first faradic size can be controlled by the winding ratio of main coil 452 and secondary coil 454.The electric current from power supply unit 410 that flows through the main coil 452 of transformer 450 causes induction current by electromagnetic induction in the secondary coil 454 of transformer 450.Owing to be supplied to secondary coil 454 by first induction current of transformer 450 generations rather than the electric current of power supply unit 410, so the calandria (not shown) of power supply unit 410 and well heater 470 is electrically insulated from each other.
Fig. 5 is the functional block diagram of fixing device according to another embodiment of the present invention.The fixing device of Fig. 5 comprise power supply unit 510, line filter 520, transformer 530, conductive switch 540 and the fixation unit 550 with well heater 560, power supply unit 510, line filter 520 and fixation unit 550 basically respectively with Fig. 4 in power supply unit 410, line filter 420 identical with fixation unit 460.Yet fixing device shown in Figure 5 does not comprise rectifier 430 and AC generator 440.
Conductive switch 540 has been removed harmonic component by line filter 520 by switching on and off switch and supply or be cut to the electric current of fixation unit 550 in this electric current.The electric current of power supply unit 510 that flows through the main coil 532 of transformer 530 produces first induction current by electromagnetic induction in the secondary coil 534 of transformer 530.First induction current is supplied to the well heater 560 of fixation unit 550.Because first induction current that is produced by transformer 530 rather than the electric current of power supply unit 510 are supplied to the calandria (not shown) of well heater 560, so the calandria of power supply unit 510 and well heater 560 is electrically insulated from each other.
In the fixing device of Figure 4 and 5, fixation unit 460 and 550 well heater 470 and 560 are respectively by transformer 450 and 530 and power supply unit 410 and 510 electrical isolations.Thereby, in the fixing device of Figure 4 and 5, fixation unit 460 and 550 well heater 470 and 560 do not need thick insulation course 330a, 330b and the 330c shown in the image pattern 3 separately, and only need the insulation course that approaches, make the calandria and the not short circuit each other of toner fixing unit of well heater 470 and 560.Thin insulation course can be made of the insulation course with the withstand voltage that is equal to or less than 1kV.
The fixation unit 460 and 550 of Figure 4 and 5 is described in further detail now with reference to Fig. 6 A and 6B.Fig. 6 A is that Fig. 6 B is the well heater 470 of the fixation unit 460 shown in Fig. 6 A or 550 or 560 detail drawing along the sectional view of the side plane intercepting that is passed in the fixation unit 460 that uses in the fixing device of Fig. 4 or 5 or 550.
With reference to Fig. 6 A, fixation unit 460 or 550 comprises: cylindricality toner fixing unit 620 forms the protective seam 610 that applies through special teflon on it; Tubulose and enlargement of pipe attachment portion 650 with opened end portions, it is arranged on 620 inside, toner fixing unit; And be arranged on well heater 470 or 560 between toner fixing unit 620 and the enlargement of pipe attachment portion 650.Well heater 470 or 560 comprises calandria 660, and it produces heat with spirality around enlargement of pipe attachment portion 650 and by the electric current that the external power source unit is supplied; And insulation course 630 and 640, it is around calandria 660, make calandria 660 not with toner fixing unit 620 and 650 short circuits of enlargement of pipe adhesion unit.
Although the toner fixing unit 620 of the fixation unit 460 of Fig. 6 A or 550 example as fixing roller is illustrated, but can use the toner fixing unit 620 of other type according to the application scenario of fixation unit 460 or 550, and this does not depart from the scope of the present invention yet.Below, will be described with the example of toner fixing unit 620 as the toner fixing roller.
Calandria 660 can be made of coil.Can use the calandria of other type according to the application scenario of fixation unit 460 or 550, and this does not depart from the scope of the present invention yet.
The coil of calandria 660 is by carrying out resistance heated by transformer 450 or 530 first induction currents that produce.Should be AC signals by first induction currents of transformer 450 or 530 generations corresponding to the AC signal that is input to transformer 450 or 530.When first induction current of AC signal was input to the coil of calandria 660, the alternating flux that changes according to first induction current produced in the coil of calandria 660.Alternating flux traversed by fixing roller 620, and in fixing roller 620, produce eddy current to offset the variation of alternating flux.The eddy current that produces in fixing roller 620 will be called as second induction current.Fixing roller 620 can be made of aldary, aluminium alloy, nickel alloy, ferroalloy, evanohm or manganese alloy.Therefore, thus fixing roller 620 has resistance and carries out resistance heated by second induction current.After this, use the heating of the second faradic fixing roller 620 will be called as induction heating.According to the application scenario of fixation unit 460 or 550, fixing roller 620 can be made of different materials, and this does not depart from the scope of the present invention.
Calandria 660 can be made of aldary, aluminium alloy, nickel alloy, ferroalloy or evanohm, have the calandria 660 end-to-end resistance that are equal to or less than about 100 Ω, make and when electric current input calandria 660, carry out resistance heated by the ohmic loss that in calandria 660, takes place.According to the application scenario of fixation unit 460 or 550, calandria 660 can be made of different materials, and this does not depart from the scope of the present invention.
Insulation course comprise be arranged on first insulation course 630 between fixing roller 620 and the calandria 660 and be arranged on calandria 660 and enlargement of pipe adhesion unit 650 between second insulation course 640.First and second insulation courses 630 and 640 can be made of the material of selecting from the following group that constitutes: mica, polyimide, pottery, silicon, polyurethane, glass and polytetrafluoroethylene (PTFE).According to the application scenario of fixation unit 460 or 550, insulation course 630 can be made of different materials with 640, and this does not depart from the scope of the present invention.
Fig. 6 B is the detail drawing of the part B shown in Fig. 6 A (being the well heater 470 or 560 of fixation unit 460 or 550).Well heater 470 or 560 comprises the insulation course 630 that is arranged between calandria 660 and the fixing roller 620.Insulation course 630 prevents calandria 660 and fixing roller 620 short circuits, and it constitutes so that prevent the insulation course of electrical short by inserting between calandria 660 and fixing roller 620.The withstand voltage of insulation course 630 can be equal to or less than 1kV.In order to satisfy the requirement that withstand voltage is equal to or less than 1kV, for example,, can be about the insulation course 630 of the mica sheet of 0.1mm by used thickness as well heater 470 or 560 in order to prevent the short circuit between calandria 660 and fixing roller 620.If the mica sheet of thickness 0.1mm may ruinedly be talked about, then can respectively be about two mica sheets of 0.1mm by used thickness, so that prevent fixing roller 620 and calandria 660 short circuit each other.
Because the thickness of first insulation course 630 that inserts between fixing roller 620 and calandria 660 increases, the small amount of thermal that is produced by calandria 660 sends fixing roller 620 to.Thereby if the thickness of first insulation course 630 descends, then the heat that is produced by calandria 660 can more effectively send fixing roller 620 to.According to the application scenario of fixation unit 460 or 550, first insulation course 630 can be made of different materials and have different thickness, and this does not depart from the scope of the present invention.
Fig. 7 is the fixation unit 460 that uses in the fixing device of Fig. 4 or 5 or 550 detail drawing.With reference to Fig. 7, fixation unit 460 or 550 comprises coating layer portion 610, fixing roller 620, first and second insulation courses 630 and 640, calandria 660 and enlargement of pipe attachment portion 650.End cap 724 and power transmit the end opposite that end cap 730 is installed in fixation unit 460 and 550.The structure of power transmission end cap 730 is similar to the structure of end cap 724.Yet power transmits end cap 730 and is connected to the drive part 738 that is installed in the framework 732 that is used to support fixation unit 460 or 550.Power transmission unit setting such as the gear train 740 is used to rotate fixation unit 460 or 550.
In addition, in end cap 724, form pore 726.After the generation type of pore 726 made in end cap 724 is installed in fixation unit 460 or 550, fixation unit 460 or 550 inner space 728 were via pore 726 good ventilation.Thereby even enlargement of pipe attachment portion 650 is heated by the heat that sends from calandria 660, inner space 728 also maintains atmospheric pressure via pore 726.Pore 726 can be provided in power and transmits in the end cap 730.In addition, pore 726 can be arranged on end cap 724 and power transmits in the end cap 730.
Fig. 8 A and 8B are the pictures that following state is shown: according to embodiments of the invention, fixation unit 460 that uses in Fig. 4 or 5 the fixing device or 550 well heater 470 or 560, fixing roller 620 and enlargement of pipe attachment portion 650 carry out close attachment each other.In the fixation unit shown in Fig. 8 A and the 8B 460 or 550, heater coil illustrates as the example of calandria 660.
For the heat that will be produced by the heater coil 660 of well heater 470 or 560 effectively sends fixing roller 620 to, be not taken in well heater 470 or 560 first and second insulation courses 630 and 640 and heater coil 660 between have the clearance.In an embodiment of the present invention, fixation unit 460 or 550 heater coil 660 and first and second insulation courses 630 and 640 are by using the enlargement of pipe pressure plastic yield that is applied by enlargement of pipe attachment portion 650, and the well heater 470 of plastic yield or 560 close attachment are on fixing roller 620 and enlargement of pipe attachment portion 650.This enlargement of pipe attachment portion 650 can be made of nonmagnetic substance or pipe.For example, metal tube, wind spring, discharge urethane (discharge urethane) or plastic tube can be used as enlargement of pipe attachment portion 650.
The peripheral tubes spreading pressure that the preferred enlargement of pipe pressure that imposes on enlargement of pipe attachment portion 650 is defined as enlargement of pipe attachment portion 650 arrives as the yield stress " σ " of the material of enlargement of pipe attachment portion 650 and produces the degree of permanent plastic deformation.The enlargement of pipe pressure " P " that imposes on enlargement of pipe attachment portion 650 uses following equation 1 to determine:
P＝σt/r (1)
Wherein P is an enlargement of pipe pressure, and σ is a yield stress, and t is the thickness of enlargement of pipe attachment portion, and r is the radius of enlargement of pipe attachment portion.
Fig. 8 A is illustrated between fixing roller part 620 and the insulation course 630 and the picture that has the situation of clearance between heater coil 660 and insulation course 630 and 640.
Fig. 8 B illustrates the picture that does not have the situation of clearance according to the embodiment of the invention between fixing roller 620, heater coil 660 and insulation course 630 and 640.Depend on and whether have shown clearance in well heater 470 or 560, promptly, the degree that depends on fixing roller 620, heater coil 660 and insulation course 630 and 640 close attachment, when the fixing roller 620 with fixation unit 460 or 550 is heated to the target fixing temperature, produce the about 4-5 difference of second.
Fig. 9 illustrates comparison using Halogen lamp LED as traditional fixation unit of thermal source and the chart that is used for the fixing roller of fixation unit is heated to the experimental data of target fixing temperature required time according to embodiment of the invention fixing roller 620 and well heater 470 or 560 each other in two kinds of situations of the fixation unit of close attachment (after this, the exemplary fixation unit according to the embodiment of the invention will be called E coil fixation unit).In experiment, mica sheet is as first and second insulation courses of E coil fixation unit, and the radius of fixing roller is 32mm, and fixing roller is made of aluminium (Al).With reference to Fig. 9, experiment illustrates to be used traditional Halogen lamp LED need spend 75 seconds fixing rollers with traditional fixation unit partly to be heated to 180 ℃ of target fixing temperatures from 20 ℃ of room temperatures.
In the E coil fixation unit according to the embodiment of the invention, when the insulation course mica sheet that respectively is 0.18mm by three and two thickness formed, the withstand voltage between fixing roller 620 and the calandria 660 was respectively 6kV and 4.2kV.In these cases, spend 34 and 24 seconds fixing rollers 620 respectively and be heated to 180 ℃ of target fixing temperatures from 20 ℃ of room temperatures with E coil fixation unit.
In the E coil fixation unit according to the embodiment of the invention, when the insulation course mica sheet that respectively is 0.15mm by three and two thickness formed, the withstand voltage between fixing roller 620 and the calandria 660 was respectively 4.8kV and 3kV.In these cases, spend 27 and 14 seconds respectively fixing roller 620 is heated to 180 ℃ of target fixing temperatures from 20 ℃ of room temperatures.
When the insulation course mica sheet that respectively is 0.1mm by three, two and thickness formed, the withstand voltage between fixing roller 620 and the calandria 660 was respectively 3.3kV, 2.3kV and 1.4kV.In these cases, spend 16 seconds respectively, 10 seconds and 6 seconds are heated to 180 ℃ of target fixing temperatures with fixing roller 620 from 20 ℃ of room temperatures.
With reference to Fig. 9, it is obviously longer than at E coil fixation unit fixing roller being heated to the preheating time that the target fixing temperature spent to be used for that in using the fixation unit of Halogen lamp LED as thermal source fixing roller is heated to preheating time that the target fixing temperature spends.Along with the thickness increase of the insulation course in E coil fixation unit, the time that is heated to the target fixing temperature from room temperature increases.
As mentioned above, in fixing device according to the present invention, power supply unit and heater coil are electrically insulated from each other by transformer, make that only forming thin insulation course is used for preventing the short circuit each other of fixing roller and heater coil.By thin insulation course is provided, send fixing roller effectively to by the heat that heater coil produced, make fixing roller to be heated to the target fixing temperature from room temperature fast.
In addition, because fixing roller can be heated to the target fixing temperature from room temperature fast, when not carrying out printing, the temperature of fixing roller need not keep constant at scheduled volume in the time, thereby can prevent unnecessary energy dissipation.
Although specifically illustrated and described the present invention with reference to exemplary embodiment, but those of ordinary skills are to be understood that and are not breaking away under the situation of the spirit and scope of the present invention that defined by claims, can carry out various changes on form and the details to the present invention.
The application require to enjoy on June 29th, 2004 in the U.S. Provisional Patent Application No.60/583423 of United States Patent (USP) trademark office application and on August 17th, 2004 right of priority at the korean patent application No.10-2004-0064588 of Korea S Department of Intellectual Property application, their full text is incorporated into this by reference.
Claims (11)
1. unit that is used for the fusing toner image, this unit comprises:
Produce the well heater of alternating flux, this alternating flux changes according to first induction current, and this well heater is by this first induction current resistance heated, and wherein first induction current is an alternating current; And
The toner fixing unit, its cylindricality ground covers described well heater, and the described alternating flux by the described toner fixing of traversed by unit produces second induction current therein, and this toner fixing unit is by the second induction current resistance heated, and the fusing toner image;
Wherein, described well heater comprises: calandria, and this calandria produces the alternating flux that changes according to described first induction current, and by this first induction current resistance heated; Be arranged on first insulation course between described calandria and the described toner fixing unit; Be arranged on the inside of described toner fixing unit and described well heater closely is attached to attachment portion on the described toner fixing unit; Be arranged on second insulation course between described attachment portion and the described calandria.
2. unit as claimed in claim 1, wherein, described calandria is made of coil.
3. unit as claimed in claim 2, wherein, the withstand voltage of described first insulation course is equal to or less than 1kV.
4. unit as claimed in claim 2, wherein, described first insulation course is made of at least a material of selecting from the following group that constitutes: mica, polyimide, pottery, silicon, polyurethane, glass and teflon.
5. unit as claimed in claim 4, wherein, described first insulation course is made of the mica that thickness is equal to or less than 0.2mm.
6. unit as claimed in claim 2, wherein, described well heater and described toner fixing unit together rotate.
7. device that is used for the fusing toner image, this device comprises:
Power supply unit, predetermined alternating current is imported this power supply unit, and this power supply unit produces first induction current in response to the described alternating current of importing;
Well heater, this well heater produces the alternating flux that changes according to described first induction current, and by this first induction current resistance heated;
The toner fixing unit, its cylindricality ground covers described well heater, and the described alternating flux by the described toner fixing of traversed by unit produces second induction current therein, and this toner fixing unit is by the second induction current resistance heated, and the fusing toner image;
Wherein, described well heater comprises: calandria, and this calandria produces the alternating flux that changes according to described first induction current, and by this first induction current resistance heated; Be arranged on first insulation course between described calandria and the described toner fixing unit; Be arranged on the inside of described toner fixing unit and described well heater closely is attached to attachment portion on the described toner fixing unit; Be arranged on second insulation course between described attachment portion and the described calandria.
8. device as claimed in claim 7, wherein, described power supply unit comprises:
The rectifier that is used to respond predetermined alternating current and produces DC current;
Be used for producing the alternating current generator of alternating current from described DC current; And
Be used for producing the insulation unit that first induction current also is supplied to this first induction current well heater in response to the alternating current that is produced.
9. device as claimed in claim 8, wherein, described insulation unit is with described alternating current generator and described well heater electrical isolation.
10. device as claimed in claim 9, wherein, described insulation unit is made of high-frequency transformer.
11. device as claimed in claim 8, wherein, described device also comprises:
Line filter, described line filter are used for removing the harmonic noise component from described predetermined alternating current input rectifier.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58342304P | 2004-06-29 | 2004-06-29 | |
| US60/583,423 | 2004-06-29 | ||
| KR64588/04 | 2004-08-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1737699A CN1737699A (en) | 2006-02-22 |
| CN100538548C true CN100538548C (en) | 2009-09-09 |
Family
ID=36080518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101098262A Expired - Fee Related CN100538548C (en) | 2004-06-29 | 2005-06-29 | The device that is used for fusing toner on print media |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100538548C (en) |
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2005
- 2005-06-29 CN CNB2005101098262A patent/CN100538548C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1737699A (en) | 2006-02-22 |
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