WO2005038535A1 - 定着装置 - Google Patents
定着装置 Download PDFInfo
- Publication number
- WO2005038535A1 WO2005038535A1 PCT/JP2004/014753 JP2004014753W WO2005038535A1 WO 2005038535 A1 WO2005038535 A1 WO 2005038535A1 JP 2004014753 W JP2004014753 W JP 2004014753W WO 2005038535 A1 WO2005038535 A1 WO 2005038535A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic
- fixing device
- heating element
- core
- roller
- Prior art date
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
- G03G15/2042—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature specially for the axial heat partition
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/14—Tools, e.g. nozzles, rollers, calenders
- H05B6/145—Heated rollers
Definitions
- the present invention relates to a fixing device useful for an image forming apparatus such as an electrophotographic or electrostatic recording type copier, facsimile, and printer, and more particularly, to a recording apparatus using an electromagnetic induction heating type heating means.
- the present invention relates to a fixing device that heats and fixes an unfixed image on a medium.
- a fixing device of an electromagnetic induction heating (IH induction heating) system generates an eddy current by applying a magnetic field generated by a magnetic field generating means to a heating element, and generates Joule heat of the heating element due to the eddy current.
- This is a fixing device that heats and fixes unfixed images on recording media such as transfer paper and OHP sheets.
- the fixing device of the electromagnetic induction heating type has an advantage that the heat generation efficiency is high and the fixing speed can be increased as compared with a fixing device of a heat roller type using a halogen lamp as a heat source.
- a fixing device using a thin-walled heat-generating body such as a thin-walled sleeve or an endless belt as the heat-generating body has a small heat capacity of the heat-generating body, and can heat this heat-generating body in a short time. As a result, it is possible to significantly improve the rising response until the heat is generated at a predetermined fixing temperature.
- a heating element is electromagnetically induced.
- a type is known in which only the magnetic flux acting on the non-sheet passing area of the heating element is absorbed by a magnetic flux absorbing member movable in the heat generation width direction of the heating element. (For example, see Patent Document 1).
- a magnetic flux generating means for electromagnetically inducing and generating heat in the heating element, behind the first magnetic core, corresponding to the non-sheet passing area. It is known to dispose a second magnetic core that changes the temperature distribution in the longitudinal direction of the heating element by changing the gap between the first magnetic core and the second magnetic core (for example, see Patent Document 2). reference).
- FIG. 1 is a schematic perspective view of an embodiment of a fixing device disclosed in Patent Document 1.
- the fixing device includes a coil assembly 10, a metal sleeve 11, a holder 12, a pressure porter 13, a magnetic flux shielding plate 31, a displacement unit 40, and the like.
- the coil assembly 10 generates a high-frequency magnetic field.
- the metal sleeve 11 is heated by the induction current induced by the induction coil 18 of the coil assembly 10, and rotates in the direction in which the recording material 14 is conveyed.
- the coil assembly 10 is held inside a holder 12.
- the holder 12 is fixed to a fixing unit frame (not shown) and does not rotate.
- the pressure roller 13 rotates in a direction in which the recording material 14 is conveyed while pressing the metal sleeve 11 to form a gap.
- the recording material 14 is nipped and conveyed by the tape portion, the unfixed image on the recording material 14 is heated and fixed on the recording material 14 by the heated metal sleeve 11.
- the magnetic flux shielding plate 31 has an arc-shaped curved surface that mainly covers the upper half of the induction coil 18, and is provided in a gap between both ends of the coil assembly 10 and the holder 12 by the displacement means 40. It is advanced and retreated.
- the displacement means 40 includes a wire 33 connected to the magnetic flux shielding plate 31, a pair of pulleys 36 on which the wires 33 are suspended, and a motor 34 for driving one of the pulleys 36 to rotate.
- FIG. 2 is a schematic sectional view of an embodiment of the fixing device disclosed in Patent Document 2.
- the fixing device includes a heating assembly 51, a holder 52, a core holding and rotating member 53, an exciting coil 54, a first core 55, a second core 56, a fixing roller 57, and a pressure roller 58. And so on.
- the calo-heat assembly 51 includes a holder 52, a core holding and rotating member 53, an exciting coil 54, a first core 55, and a second core 56, and generates a magnetic flux.
- the fixing roller 57 is induced to generate heat by the action of the magnetic flux generated from the heating assembly 51 and rotates in the direction in which the recording material 59 is conveyed.
- the pressure roller 58 rotates in the direction in which the recording material 59 is conveyed while pressing the fixing roller 57 to form a gap.
- the unfixed image on the recording material 59 is heated and fixed to the recording material 59 by the fixing roller 57 that has generated heat by the nipping and transporting of the recording material 59 by the top portion.
- the first core 55 has the same width as the width of the maximum sheet passing area of the fixing roller 57.
- the second core 56 is moved to a position close to the first core 55 as shown in FIG. 2A.
- the second core 56 is positioned at a position separated from the first core 55 by rotating the core holding / rotating member 53 by 180 ° as shown in FIG. 2B. Be moved. As a result, heat generation in the non-sheet passing area of the fixing roller 57 corresponding to the second core 56 is suppressed.
- Patent Document 1 Japanese Patent Application Laid-Open No. H10-74009
- Patent Document 2 JP 2003-123961
- the former fixing device is configured to move the magnetic flux shielding plate 31 forward and backward with respect to the gap between both ends of the coil assembly 10 and the holder 12 by the displacement means 40 while applying force.
- the pair of pulleys 36 of the displacement means 40 also have a problem that the force at both ends of the holder 12 protrudes greatly and the fixing device body becomes large.
- the former fixing device has a configuration in which a magnetic flux shielding plate 31 is arranged between the metal sleeve 11 and the induction coil 18 as shown in FIG.
- a fixing device that uses the induction heating method
- the magnetic flux shielding plate 31 is inserted into the narrow gap, it is necessary to reduce the thickness. That is, since the magnetic flux shielding plate 31 cannot have a sufficient thickness, there is a problem that electric resistance is increased and heat is easily generated by itself.
- By forming the through holes 35 in the magnetic flux shielding plate 31 heat generation due to eddy current can be suppressed.
- the magnetic flux reaches the metal sleeve 11 to generate heat in the non-sheet passing area of the metal sleeve.
- heat accumulates in the non-sheet passing area of the metal sleeve 11, and there is a problem that an excessive temperature rise cannot be suppressed.
- the end force of the paper passing area corresponding to the first core 55 also causes the magnetic flux to wrap around the end of the non-paper passing area corresponding to the second core 56, and the fixing roller 57, the effect of suppressing magnetic flux in the non-sheet passing area is reduced.
- this fixing device when the small-size recording material 59 is continuously passed, heat is accumulated in the non-sheet passing area of the fixing roller 57, and the excessive temperature rise can be effectively suppressed. There is a problem.
- the core holding / rotating member 53 cannot hold the second core 56 corresponding to one recording material size, so the width of the paper passing area of the fixing roller 57 is set to the maximum size and small size. It can correspond only to the paper width of the two types of recording materials.
- An object of the present invention is to provide a compact fixing device capable of preventing an excessive temperature rise in a non-sheet passing area due to a magnetic flux wrapping around from a sheet passing area of a heating element to a non-sheet passing area. .
- the fixing device of the present invention includes a magnetic flux generating unit that generates a magnetic flux, a heating element that is induction-heated by the magnetic flux, and a magnetic flux generating unit and the heating element that are disposed to face the heating element.
- a magnetic path forming body that forms a path of a magnetic flux between the magnetic path forming body, and a magnetic flux that is disposed in the magnetic path forming body and that corresponds to a non-sheet passing area of the heating element between the magnetic path forming body and the heating element. Facing the non-sheet passing area by facing a shielding position for shielding at least a part of the path of the paper.
- a magnetic suppressor that suppresses magnetic coupling between the magnetic path forming body and the heating element, and a rotation unit that causes the magnetic suppressor to face the shield position and the retracted position retracted from the shield position by rotation.
- FIG. 1 is a schematic perspective view showing the configuration of a conventional fixing device.
- FIG. 2A is a schematic cross-sectional view showing a configuration of a main part of another conventional fixing device.
- FIG. 2B is a schematic sectional view showing an operation mode of the fixing device.
- FIG. 3 is a schematic cross-sectional view showing the overall configuration of an image forming apparatus suitable for mounting the fixing device according to Embodiment 1 of the present invention.
- FIG. 4 is a sectional view showing a basic configuration of the fixing device according to the first embodiment of the present invention.
- FIG. 5 is a schematic sectional view showing a configuration of a fixing device according to Embodiment 1 of the present invention.
- FIG. 6 is a schematic perspective view showing a configuration of the fixing device according to the first embodiment of the present invention in which a cutout portion as a magnetic suppressor is formed in a center core.
- FIG. 7 is a schematic perspective view showing a configuration of a rotating unit that rotates a notch as a magnetic suppressor of the fixing device according to the first embodiment of the present invention.
- FIG. 8 is a schematic cross-sectional view showing a state in which a notch as a magnetic suppressor of the fixing device according to Embodiment 1 of the present invention is rotated to a retracted position.
- FIG. 9 is a schematic sectional view showing a configuration of a fixing device according to Embodiment 2 of the present invention.
- FIG. 10 is a schematic perspective view showing a configuration in which a magnetic shielding member as a magnetic suppressor is provided in a center arcer of a fixing device according to Embodiment 2 of the present invention.
- FIG. 11 is a schematic perspective view showing a configuration of a rotating unit that rotates a magnetic shielding member as a magnetic suppressor of the fixing device according to Embodiment 2 of the present invention.
- FIG. 12 is a schematic cross-sectional view showing a state where a magnetic shielding member as a magnetic suppressor of the fixing device according to Embodiment 2 of the present invention is rotated to a retracted position.
- FIG. 13 is a schematic sectional view showing a configuration of a fixing device according to Embodiment 3 of the present invention.
- FIG. 14 is a schematic cross-sectional view showing a state in which a notch serving as a magnetic suppressor of the fixing device according to Embodiment 3 of the present invention is rotated to a retracted position.
- FIG. 15 is a schematic sectional view showing a configuration of a fixing device according to Embodiment 4 of the present invention.
- FIG. 16 is a schematic perspective view showing a configuration of a center arcer of a fixing device according to a fourth embodiment of the present invention.
- FIG. 17A is a schematic sectional view showing a configuration of a rectangular center arcer of a fixing device according to Embodiment 4 of the present invention.
- FIG. 17B is a schematic cross-sectional view showing a configuration of a cross-shaped center arcer of the fixing device according to Embodiment 4 of the present invention.
- FIG. 17C is a schematic cross-sectional view showing a configuration in which a magnetic shielding member is embedded in a stepped portion of a cross-shaped center armor of a fixing device according to Embodiment 4 of the present invention.
- FIG. 18 is a schematic sectional view showing a configuration of a fixing device according to Embodiment 5 of the present invention.
- FIG. 19 is a schematic sectional view showing an operation mode of a main part of the fixing device according to Embodiment 5 of the present invention.
- FIG. 20 is a schematic sectional view showing a configuration of a fixing device according to Embodiment 6 of the present invention.
- FIG. 3 is a schematic cross-sectional view showing the entire configuration of an image forming apparatus suitable for mounting the fixing device according to Embodiment 1 of the present invention.
- the image forming apparatus 100 includes an electrophotographic photosensitive member (hereinafter, referred to as “photosensitive drum”) 101, a charger 102, a laser beam scanner 103, a developing device 105, and a paper feeding device 107.
- the fixing device 200 and the cleaning device 113 are provided.
- the laser beam scanner 103 is provided with a host such as an image reading device and a computer (not shown).
- a laser beam 104 modulated in accordance with a time-series electric digital pixel signal of image information input from a printing apparatus is output, and the surface of the uniformly charged photosensitive drum 101 is scanned and exposed by the laser beam 104.
- the absolute value of the potential of the exposed portion of the photosensitive drum 101 decreases to the bright potential VL, and an electrostatic latent image is formed on the surface of the photosensitive drum 101.
- the developing device 105 includes a developing roller 106 that is driven to rotate.
- the developing roller 106 is arranged to face the photosensitive drum 101, and a thin layer of toner is formed on the outer peripheral surface thereof.
- the developing roller 106 is applied with a developing bias voltage whose absolute value is smaller than the dark potential V0 of the photosensitive drum 101 and larger than the bright potential VL.
- the negatively charged toner on the developing roller 106 adheres only to the portion of the surface of the photosensitive drum 101 having the light potential VL, and the electrostatic latent image formed on the surface of the photosensitive drum 101 is reversely developed.
- the unfixed toner image 111 is formed on the photosensitive drum 101.
- the paper feeding device 107 feeds the recording paper 109 as a recording medium one by one at a predetermined timing by the paper feeding roller 108.
- the recording paper 109 fed from the paper feeding device 107 passes through a pair of registration rollers 110 and is applied to a gap between the photosensitive drum 101 and the transfer roller 112 at an appropriate timing synchronized with the rotation of the photosensitive drum 101. Sent.
- the unfixed toner image 111 on the photosensitive drum 101 is transferred to the recording paper 109 by the transfer roller 112 to which a transfer bias is applied.
- the recording paper 109 on which the unfixed toner image 111 is formed and carried as described above is guided by the recording paper guide 114, separated from the photosensitive drum 101, and then conveyed toward the fixing portion of the fixing device 200. Is done.
- the fixing device 200 heats and fixes the unfixed toner image 111 on the recording paper 109 conveyed to the fixing portion.
- the recording paper 109 on which the unfixed toner image 111 has been heated and fixed passes through the fixing device 200, and is then discharged onto a discharge tray 116 provided outside the image forming apparatus 100.
- the photosensitive drum 101 from which the recording paper 109 has been separated is cleaned by a cleaning device 113 to remove residual matters such as untransferred toner on the surface, and repeatedly used for the next image formation.
- FIG. 3 is a cross-sectional view illustrating a configuration of a fixing device.
- the fixing device 200 includes a fixing belt 210, a supporting roller 220 as a belt supporting member, an exciting device 230 as an electromagnetic induction heating means, a fixing roller 240, and a pressing roller 250 as a belt rotating means. And so on.
- fixing belt 210 is suspended between support roller 220 and fixing roller 240.
- the support roller 220 is rotatably supported on the upper side of the main body side plate 201 of the fixing device 200.
- the fixing roller 240 is rotatably supported by a swing plate 203 which is swingably attached to a main body side plate 201 by a short shaft 202.
- the pressure roller 250 is rotatably supported on the lower side of the main body side plate 201 of the fixing device 200.
- the swing plate 203 swings clockwise around the short axis 202 due to the tightness of the coil panel 204.
- the fixing roller 240 is displaced in accordance with the swing of the swing plate 203, and is pressed against the pressing roller 250 with the fixing belt 210 interposed therebetween due to the displacement.
- the support roller 220 is urged by a panel (not shown) in a direction opposite to the fixing roller 240, thereby applying a predetermined tension to the fixing belt 210.
- the pressure roller 250 is driven to rotate in a direction indicated by an arrow by a driving source (not shown).
- the fixing roller 240 is driven to rotate while holding the fixing belt 210 by the rotation of the pressure roller 250.
- the fixing belt 210 is sandwiched between the fixing roller 240 and the pressure roller 250 and is rotated in the arrow direction.
- a nip portion for heating and fixing the unfixed toner image 111 on the recording paper 109 is formed between the fixing belt 210 and the pressure roller 250.
- the exciter 230 comprises the above-mentioned IH type electromagnetic induction heating means, and as shown in FIG. 4, a magnetic source arranged along the outer peripheral surface of a portion of the fixing belt 210 suspended by the support roller 220.
- An exciting coil 231 as a raw means and a core 232 made of ferrite that covers the exciting coil 231 are provided.
- the exciting coil 231 extends in the paper passing width direction and is folded and wound at both ends of the fixing belt 210.
- a facing core 233 facing the exciting coil 231 with the fixing belt 210 and the support roller 220 interposed therebetween is provided inside the support roller 220.
- the excitation coil 231 is formed using a litz wire that is a bundle of thin wires, and has a semicircular cross-sectional shape so as to cover the outer peripheral surface of the fixing belt 210 suspended on the support roller 220. It is.
- An excitation current having a drive frequency of 25 kHz is also applied to the excitation coil 231 with an excitation circuit force (not shown).
- an alternating magnetic field is generated between the core 232 and the opposing core 233, and an eddy current is generated in the conductive layer of the fixing belt 210, so that the fixing belt 210 generates heat.
- a configuration may be adopted in which the force supporting roller 220 that generates heat from the fixing belt 210 generates heat, and the heat of the supporting roller 220 is transmitted to the fixing belt 210.
- the core 232 is provided at the center of the excitation coil 231 and at a part of the back surface.
- a material having high magnetic permeability such as permalloy can be used in addition to ferrite.
- the fixing device 200 also applies force in the direction of the arrow so that the recording paper 109 onto which the unfixed toner image 111 has been transferred contacts the fixing belt 210 with the surface on which the unfixed toner image 111 is held. By transporting, the unfixed toner image 111 can be heated and fixed on the recording paper 109.
- a temperature sensor 260 also serving as a thermistor is provided on the back surface of the fixing belt 210 at a portion passing through the contact portion with the support roller 220.
- the temperature of the fixing belt 210 is detected by the temperature sensor 260.
- the output of the temperature sensor 260 is provided to a control device (not shown).
- the control device controls the power supplied to the exciting coil 231 via the exciting circuit based on the output of the temperature sensor 260 so that the optimal image fixing temperature is obtained. Controlling.
- a portion of the fixing belt 210 suspended on the fixing roller 240 on the downstream side in the transport direction of the recording paper 109 guides the recording paper 109 having been heated and fixed toward the discharge tray 116.
- a guide 270 is provided.
- the exciting device 230 is provided with a coil guide 234 as a holding member integrally with the exciting coil 231 and the core 232.
- the coil guide 234 is made of a resin having a high heat-resistant temperature such as PEEK material and PPS.
- the coil guide 234 can prevent the exciting coil 231 from being damaged by the heat radiated by the fixing belt 210 being collected in the space between the fixing belt 210 and the exciting coil 231.
- the core 232 shown in FIG. 4 has a semi-circular cross-sectional force.
- the core 232 does not necessarily have to have a shape following the shape of the exciting coil 231. May have, for example, a substantially rectangular shape.
- the fixing belt 210 is a thin endless belt having a diameter of 50 mm and a thickness of 50 m in which a conductive layer is formed by dispersing silver powder in a polyimide resin having a glass transition point of 360 (° C). It is configured.
- the conductive layer may have a structure in which two or three 10-m-thick silver layers are laminated.
- the surface of the fixing belt 210 may be coated with a release layer (not shown) made of fluorine resin and having a thickness of 5 ⁇ m in order to impart release properties.
- the glass transition point of the base material of the fixing belt 210 is desirably in the range of 200 (° C) to 500 (° C).
- a resin or rubber having good releasability such as PTFE, PFA, FEP, silicone rubber, and fluoro rubber may be used alone or in combination. .
- the material of the base material of the fixing belt 210 in addition to the above-described polyimide resin, a resin having heat resistance such as a fluorine resin, or a metal such as a nickel thin plate and a stainless steel thin plate by electrode is used. You can also.
- the fixing belt 210 may have a configuration in which a 10 m thick copper plating is applied to the surface of SUS430 (magnetic) or SUS304 (nonmagnetic) having a thickness of 40 / zm.
- the fixing belt 210 When the fixing belt 210 is used as an image heating element for heating and fixing a monochrome image, only the releasability may be ensured. When used as a body, it is desirable to form a thick rubber layer to impart elasticity.
- the heat capacity of the fixing belt 210 is preferably 60 JZK or less, more preferably 40 JZK or less.
- the support roller 220 also has a cylindrical metal roller force having a diameter of 20mm, a length of 320mm, and a thickness of 0.2mm.
- a metal having magnetism such as iron and nickel.
- the support port 220 may be made of a nonmagnetic stainless material having a specific resistance of 50 ⁇ cm or more. preferable.
- the support roller 220 made of SUS304 which is a non-magnetic stainless steel, has a high specific resistance of 72 ⁇ cm and is non-magnetic, so that the magnetic flux transmitted through the support roller 220 is not so much blocked, for example, 0.2 mm. If the thickness is too small, the heat generated by the support roller 220 is extremely small, and the fixing belt 210 generates heat effectively. Also composed of SUS304 Since the supporting roller 220 has high mechanical strength, it can be thinned to a thickness of 0.04 mm to further reduce the heat capacity.
- the fixing roller 240 is made of silicone rubber, which has a low hardness (here, JISA 30 degrees) and a low thermal conductivity elasticity foam having a diameter of 30 mm.
- the calo pressure roller 250 is made of silicone rubber having a hardness of ISA65 degrees.
- a heat-resistant resin such as fluorine rubber and fluorine resin or another rubber may be used. It is desirable that the surface of the pressure roller 250 be coated with a resin such as PFA, PTFE, FEP or the like or a rubber alone or in a mixture in order to enhance abrasion resistance and releasability. Further, it is desirable that the pressure roller 250 be made of a material having low thermal conductivity.
- FIG. 5 is a schematic sectional view showing the configuration of the fixing device according to the first embodiment.
- the fixing device 300 includes a heating roller 310 serving as the heating element made of a magnetic material, an exciting coil 331 serving as the magnetic flux generating means, an arch core 332 covering the exciting coil 331, and an arch core 332.
- a center core 333 and a side core 334 are provided as the magnetic path forming member that forms a magnetic flux path between the heat generating roller 310 and the heat generating roller 310.
- the center core 333 is formed of a columnar rotating body made of a ferromagnetic material such as ferrite parallel to the direction of the rotation axis of the heat roller 310, and is located at the center of the winding of the exciting coil 331. Be placed.
- the center core 333 two notches 333a and 333b as the magnetic suppressors are formed on a surface facing the non-sheet passing area of the heat roller 310. These notches 333a and 333b are located to face each other with the center core 333 interposed therebetween.
- the positions of the cutouts 333a and 333b formed on the center core 333 are determined in accordance with the paper passing reference of the recording paper 109.
- notches 333a, 333b are formed at both ends of the force center core 333 with the center of the recording paper 109 as a center reference.
- the length of the center core 333 is formed larger than the width of the B4 size recording paper, which is the maximum paper passing area width of the heat generating roller 310.
- the length of the center core 333 is configured to correspond to the width of the A3 size recording paper.
- the notch 333a has a length corresponding to the width of the non-sheet passing area of the heat roller 310 when A4 size recording paper is passed through the gap between the heat roller 310 and the pressure roller 250.
- the notch 333b has a length corresponding to the width of the non-sheet passing area of the heat roller 310 when the B4 size recording paper is passed through the gap between the heat roller 310 and the pressure roller 250. ing.
- FIG. 7 is a schematic perspective view showing a rotating means 500 for rotating the notches 333a and 333b of the center core 333.
- the rotating means 500 includes a small gear 501 provided on the support shaft of the center core 333, a small gear 501, a large gear 502 that meshes with the small gear 501, and a stepping motor that rotates by supporting the large gear 502. 503 etc.
- the notch 333b also rotates its retracting position force to the shielding position. In this way, the notch 333b also rotates the retracting position force to the shielding position, so that the center core 333 and the heating roller 310 corresponding to the non-sheet passing area of the heating roller 310 when the B4 size recording paper is passed. Magnetic coupling with the notch 333b.
- the notch portions 333 a and 333 b are rotated by the rotating means 500 to the retreat position force to the shielding position, and the center core 333 and the heat generating roller 310 are magnetically coupled. Controlling power.
- the rotation of the center core 333 causes the notches 333a and 333b, which are the magnetic suppression members, to face the shielding position shown in FIG. 5, and the state shown in FIG.
- the distance between the heat-generating roller 310 and the center core 333 at a portion corresponding to the non-sheet passing area changes in a state of facing the retreat position.
- the gap between the heat roller 310 and the center core 333 at the portion corresponding to the non-sheet passing area becomes wider when the notches 333a and 333b face the shielding position.
- the notches 333a and 333b become narrower in a state facing the retreat position.
- the degree of magnetic coupling between the center core 333 and the heat roller 310 increases as the distance between the center core 333 and the heat roller 310 decreases, and increases as the distance between the center core 333 and the heat roller 310 increases. become weak.
- the center unit 333 is rotated by the rotating unit 500 so that the cutouts 333 a and 333 b face the shielding position, thereby magnetically coupling the center core 333 and the heat generating roller 310.
- the temperature By reducing the temperature, it is possible to suppress an excessive temperature rise in the non-sheet passing area of the heat generating roller 310.
- the strength of the magnetic coupling between the center core 333 and the heating roller 310 can be switched only by rotating the center core 333.
- the paper passing area width of 333 can easily correspond to the paper widths of two types of recording paper, A4 size and B4 size.
- the magnetic suppressor is formed by the cutouts 333a and 333b formed in the center core 333, it is not necessary to prepare the magnetic suppressor as a separate member. Simplification of the configuration and low cost can be realized.
- FIG. 9 is a schematic sectional view showing the configuration of the fixing device according to the second embodiment.
- the magnetic suppressor is configured by magnetic shielding members 70la and 701b, and the other configuration is the same as that of the fixing device 300 according to the first embodiment. is there.
- the magnetic shielding members 701a and 701b as the magnetic suppressors are made of a material capable of blocking magnetic coupling between the center core 333 corresponding to the non-sheet passing area of the heat roller 310 and the heat roller 310, for example, It is formed of an inexpensive low-permeability electric conductor such as copper or aluminum. As shown in FIGS. 9 and 10, the magnetic shielding members 701a and 701b are disposed on the peripheral surface of the center core 333 facing the non-sheet passing area of the heat roller 310 so as to face each other. It is.
- the center of the recording paper 109 is passed by the center, and the magnetic shielding members 701a, 701a, 7 01b are formed at both ends of the center core 333.
- the center core 333 is formed to be larger than the width of the B4 size recording sheet, which is the maximum sheet passing area width of the heat generating roller 310.
- the center core 333 is configured to correspond to the length force A3 size of the recording paper width.
- the magnetic shielding member 70 la has a length corresponding to the width of the non-sheet passing area of the heating roller 310 when the A4 size recording paper is passed through the gap between the heating roller 310 and the pressure roller 250.
- the magnetic shielding member 701b has a length corresponding to the width of the non-sheet passing area of the heating roller 310 when the B4 size recording paper is passed through the gap between the heating roller 310 and the pressure roller 250.
- the magnetic shielding members 701a and 701b are rotated together with the center core 333 by the rotating means 900 shown in FIG. Similar to the rotating means 500 shown in FIG. 7, the rotating means 900 rotates by supporting a small gear 901 provided on the support shaft of the center core 333, a large gear 902 meshing with the small gear 901 and a large gear 902. And a stepping motor 903.
- the magnetic shielding member 701b also rotates its retracting position force to the shielding position. In this manner, the magnetic shielding member 701b also rotates the retracting position force to the shielding position, so that the center core 333 and the heating roller corresponding to the non-sheet passing area of the heating roller 310 when the B4 size recording paper is passed. Magnetic coupling with 310 is suppressed by the magnetic shielding member 70 lb.
- the magnetic shielding member 701 a faces the non-sheet passing area of the heat roller 310 when the A4 size recording paper is passed.
- the magnetic coupling between the corresponding center core 333 and the heat generating roller 310 is suppressed by the magnetic shielding member 70 la.
- the magnetic shielding members 701 a and 701 b are also rotated by the rotating means 900 to the shielding position with their retracting position forces, so that the magnetic force between the center core 333 and the heat generating roller 310 is reduced. It blocks or promotes binding.
- the rotation of the center core 333 causes the magnetic shielding members 701a and 701b, which are the magnetic suppression members, to face the shielding position shown in FIG.
- the magnetic coupling between the heat generating roller 310 and the center core 333 corresponding to the region is interrupted.
- the center core 333 is rotated by the rotating means 900 so that the respective magnetic shielding members 701a and 701b face the shielding position. Since the magnetic coupling is interrupted, it is possible to suppress an excessive temperature rise in the non-sheet passing area of the heating roller 310.
- magnetic coupling between center core 333 and heat roller 310 can be interrupted only by rotating center core 333.
- the width of the paper passing area of the heat generating roller 333 can easily correspond to the paper widths of two types of recording paper, A4 size and B4 size, as shown in FIG.
- the magnetic suppressor is composed of the magnetic shielding members 701a and 701b provided on the center core 333, it is not necessary to prepare the magnetic suppressor as a separate member. The simplification of the configuration and the low cost can be realized.
- the fixing device 700 has a configuration in which the magnetic shielding members 701a and 701b are arranged at the winding center of the exciting coil 331, it is not necessary to reduce the thickness of the magnetic shielding members 701a and 701b. It is possible to increase the thickness, for example, to about lmm. Thereby, the electric resistance of the magnetic shielding members 701a and 701b is reduced, so that the heat generation of the magnetic shielding members 701a and 70lb is suppressed. Further, since the magnetic shield 301 is provided on the center core 333 made of a material such as ferrite having a high thermal conductivity and a high specific heat, the heat generated by the magnetic shield members 7 Ola and 701b is not generated by the center core 333.
- the magnetic shield members 701a and 701b increase in thickness to reduce the electrical resistance and facilitate eddy current flow. Thereby, the repulsive magnetic field is strengthened, and the magnetic flux can be more effectively shielded. Further, since the magnetic shielding members 701a and 701b do not require the through holes 35, the magnetic flux can be shielded more effectively than the magnetic flux shielding plate 31 of FIG.
- FIG. 13 is a schematic sectional view showing the configuration of the fixing device according to the third embodiment.
- the fixing device 1100 forms a magnetic flux path on the side of the arch core 332 that covers the excitation coil 331, on the side facing the heat roller 310 with the center core 333 interposed therebetween, so as to bypass the center core 333.
- the detour path 332a to be formed is formed.
- Other configurations of the fixing device 1100 are the same as those of the fixing device 700 according to the second embodiment.
- the fixing device 1100 includes a magnetic shielding member 701a, 701b as a magnetic suppressor formed in the center core 333, a magnetic flux path whose magnetic coupling is regulated, and a detour of the arch core 332. A new magnetic flux path is formed by the path section 332a.
- a new magnetic flux path can be secured by the detour path section 332a. Can be increased.
- the portion of the closed loop of the magnetic path 600 where the magnetic flux between the center core 333 and the heat generating roller 310 is concentrated is controlled by the magnetic shielding members 701a and 701b of the center core 333. Shielding. Accordingly, in the fixing device 1100, the magnetic coupling between the center core 333 corresponding to the non-sheet passing area of the heat generating roller 310 and the heat generating roller 310 can be efficiently suppressed, and the magnetic suppressing body serving as the magnetic suppressor can be efficiently used.
- the width of the shielding members 701a and 701b in the rotation direction can be reduced, and two magnetic shielding members 701a and 701b can be formed on the center core 333 as shown in FIG.
- the paper passing area of the heat roller 310 is formed by two types of recording paper regulated by the two magnetic shielding members 701a and 701b formed on the center core 333, as shown in FIG.
- a new route passes through the detour route section 332a of the arch core 332.
- the fixing device 1100 has a configuration in which the magnetic shielding members 701a and 701b are arranged at the winding center of the exciting coil 331, it is not necessary to reduce the thickness of the magnetic shielding members 701a and 701b. It is possible to increase the thickness to, for example, about lmm. Thereby, the electric resistance of the magnetic shielding members 701a and 701b is reduced, so that the heat generation of the magnetic shielding members 701a and 70lb is suppressed.
- the magnetic shield 301 is provided on the center core 333 made of a material such as ferrite having a high thermal conductivity and specific heat, the heat generated by the magnetic shield members 7 Ola and 701b is not generated by the center core 333.
- the magnetic shield members 701a and 701b can be prevented from excessively rising in temperature.
- the magnetic shield members 701a and 701b increase in thickness to reduce the electrical resistance and facilitate eddy current flow. Thereby, the repulsive magnetic field is strengthened, and the magnetic flux can be more effectively shielded. Further, since the magnetic shielding members 701a and 701b do not require the through holes 35, the magnetic flux can be shielded more effectively than the magnetic flux shielding plate 31 of FIG.
- FIG. 15 is a schematic sectional view showing the configuration of the fixing device according to the fourth embodiment.
- the fixing device 1300 is such that the magnetic suppressor is configured by stepped portions 1333a and 1333b, and other configurations are the same as those of the fixing device 300 according to the first embodiment. It is.
- the center core 1333 of the fixing device 1300 is formed of a rectangular column.
- the stepped portions 1333a and 1333b as the magnetic suppressors are formed in lower halves of both ends of the center core 1333 facing the non-sheet passing area of the heating roller 310.
- the width W1 in the rotational direction of the facing surface of the center core 1333 on which the stepped portions 1333a and 1333b are not formed is the force S formed by the stepped portions 1333a and 1333b. It is larger than the width W2 of the facing surface of the center core 333 on the side in the rotation direction.
- the rotation of the center core 1333 causes the stepped portions 1333a and 1333b, which are the magnetic suppressors, to move to the opposing positions opposing the heat generating roller 310.
- the width in the rotation direction of the facing surface of the center core 1333 facing the non-sheet passing area of the heat roller 310 becomes a wide width W1 when the stepped portions 1333a and 1333b face the retracted position, and the stepped portion has a wide width W1.
- the width W2 is narrow when the portions 1333a and 1333b face the opposed position.
- the magnetic coupling force between the heat roller 310 and the center core 1333 increases as the width of the facing surface of the center core 1333 in the rotation direction increases, and the center core 1333 faces the non-sheet passing area of the heat roller 310. If the width of the opposing surface of 1333 in the rotation direction becomes narrow, the width becomes weak.
- the center roller 1333 is rotated by the rotating means 500 (or 900), so that the stepped portions 1333a and 1333b face the above-mentioned opposing positions, and thus the heat generating roller 310
- the degree of magnetic coupling with the center core 1333 it is possible to suppress excessive temperature rise in the non-sheet passing area of the heat generating roller 310.
- the degree of magnetic coupling between the heat generating roller 310 and the center core 1333 can be switched simply by rotating the center core 1333.
- the width of the paper passing area can easily correspond to the width of recording paper of a plurality of sizes.
- the configuration can be simplified and the cost can be reduced.
- the fixing device 1300 it is possible to easily prevent an excessive rise in the temperature of the non-sheet passing area of the heat generating roller 310 when recording sheets of plural sizes are passed.
- the shape of the center core 1333 in the fixing device 1300 is not limited to the rectangular shape shown in Fig. 16, but may be a cross formed with four stepped portions 1333a, 1333b, and 1333c as shown in Fig. 17B. It may be a form! /.
- the stepped portion of center core 1333 may have a configuration in which magnetic shielding members 1501a, 1501b, and 1501c made of copper or aluminum are embedded.
- FIG. 18 shows Embodiment 5 1 is a schematic sectional view of a fixing device according to the first embodiment.
- the fixing device 1600 has an endless belt 1602 rotated by a pulley 1601 suspended on a center core 1633 as the magnetic path forming body.
- the magnetic shield layer 1603 having a predetermined width as a suppressor is formed.
- the endless belt 1602 is rotated from the pulley 1601 and the magnetic shielding layer 1603 on the peripheral surface of the endless belt 1602 causes the heat generating roller 310 to rotate as shown in FIG. Cover the center core 1633 corresponding to the paper passing area.
- the degree of magnetic coupling between the center core 1633 corresponding to the non-sheet passing area covered by the magnetic shielding layer 1603 of the endless belt 1602 and the heating roller 310 is suppressed, and the heating roller 310 The excessive temperature rise in the non-sheet passing area is suppressed.
- FIG. 20 is a schematic sectional view showing the configuration of the fixing device according to the sixth embodiment.
- this fixing device 1800 has a configuration in which a leakage magnetic shield 1801 is disposed between an arch core 332 and an exciting coil 331, and other configurations are the same as those of the third embodiment. This is the same as the fixing device 1100.
- the magnetic shielding member 701b as the magnetic suppressor blocks the magnetic coupling between the center core 333 and the heat roller 310, the excessive temperature rise in the non-sheet passing area of the heat roller 310 is suppressed. Is done. However, a small amount of leakage magnetic flux from the arch core 332 to the heat generating roller 310 through the exciting coil 331 is generated. Since the leakage magnetic shield 1801 shields this leakage magnetic flux, excessive temperature rise in the non-sheet passing area is effectively suppressed.
- the leakage magnetic shield 1801 be narrower than the winding portion of the exciting coil 331. In this way, when heating the maximum sheet passing area width of the heat generating roller 310, the leakage magnetic shield 1801 does not affect the closed loop of the magnetic path 600 shown in FIG. It doesn't happen.
- the force using the heat generating roller 310 as the heat generating element may be the heat generating belt 210 shown in FIG.
- the magnetic path forming body provided with the magnetic suppressor is the center core 333 (or 1333), but the magnetic suppressor is provided.
- the magnetic path forming body may be a side core 334 disposed on the side of the exciting coil 331 that crosses the magnetic path of the arch core 332. According to this configuration, the degree of magnetic coupling between the side core 334 and the heat generating roller 310 corresponding to the non-sheet passing area of the heat generating roller 310 can be switched.
- the heat roller is a consumable part. Work efficiency of replacement and maintenance of parts such as 310 is good.
- the fixing device according to the present invention can be configured to be small and prevent the temperature of the non-sheet passing area from being excessively increased due to the magnetic flux wrapping around the non-sheet passing area due to the heat-generating element. Therefore, it is useful as a fixing device for an electrophotographic or electrostatic recording type copying machine, facsimile, printer, or the like.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fixing For Electrophotography (AREA)
- General Induction Heating (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/575,353 US7369804B2 (en) | 2003-10-17 | 2004-10-06 | Fixing device |
JP2005514745A JP4264086B2 (ja) | 2003-10-17 | 2004-10-06 | 定着装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003358023 | 2003-10-17 | ||
JP2003-358023 | 2003-10-17 |
Publications (1)
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WO2005038535A1 true WO2005038535A1 (ja) | 2005-04-28 |
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ID=34463274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/014753 WO2005038535A1 (ja) | 2003-10-17 | 2004-10-06 | 定着装置 |
Country Status (3)
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US (1) | US7369804B2 (ja) |
JP (2) | JP4264086B2 (ja) |
WO (1) | WO2005038535A1 (ja) |
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JP2009162994A (ja) * | 2008-01-07 | 2009-07-23 | Kyocera Mita Corp | 画像形成装置 |
JP2009162995A (ja) * | 2008-01-07 | 2009-07-23 | Kyocera Mita Corp | 画像形成装置 |
JP4623106B2 (ja) * | 2008-02-20 | 2011-02-02 | コニカミノルタビジネステクノロジーズ株式会社 | 定着装置および画像形成装置 |
JP2009198665A (ja) * | 2008-02-20 | 2009-09-03 | Konica Minolta Business Technologies Inc | 定着装置および画像形成装置 |
JP2009237402A (ja) * | 2008-03-28 | 2009-10-15 | Kyocera Mita Corp | 画像形成装置 |
JP2010026246A (ja) * | 2008-07-18 | 2010-02-04 | Kyocera Mita Corp | 画像形成装置 |
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JP2010066547A (ja) * | 2008-09-11 | 2010-03-25 | Kyocera Mita Corp | 定着装置,画像形成装置 |
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JP2010256630A (ja) * | 2009-04-24 | 2010-11-11 | Kyocera Mita Corp | 定着装置及びこれを搭載した画像形成装置 |
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JP2013235294A (ja) * | 2013-08-12 | 2013-11-21 | Kyocera Document Solutions Inc | 定着装置 |
Also Published As
Publication number | Publication date |
---|---|
JP4264086B2 (ja) | 2009-05-13 |
JP2009037264A (ja) | 2009-02-19 |
US20070014599A1 (en) | 2007-01-18 |
US7369804B2 (en) | 2008-05-06 |
JPWO2005038535A1 (ja) | 2007-11-22 |
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