WO2015075987A1 - 定着装置およびこれを備える画像形成装置 - Google Patents
定着装置およびこれを備える画像形成装置 Download PDFInfo
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- WO2015075987A1 WO2015075987A1 PCT/JP2014/072407 JP2014072407W WO2015075987A1 WO 2015075987 A1 WO2015075987 A1 WO 2015075987A1 JP 2014072407 W JP2014072407 W JP 2014072407W WO 2015075987 A1 WO2015075987 A1 WO 2015075987A1
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- WIPO (PCT)
- Prior art keywords
- fixing
- elastic layer
- roller
- pressure roller
- fixing device
- Prior art date
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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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- 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
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
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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
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00135—Handling of parts of the apparatus
- G03G2215/00139—Belt
- G03G2215/00143—Meandering prevention
- G03G2215/00151—Meandering prevention using edge limitations
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/20—Details of the fixing device or porcess
- G03G2215/2003—Structural features of the fixing device
- G03G2215/2016—Heating belt
- G03G2215/2035—Heating belt the fixing nip having a stationary belt support member opposing a pressure member
Definitions
- the present invention relates to a fixing device that fixes a toner image on a recording medium and an image forming apparatus including the same.
- An electrophotographic image forming apparatus such as a copying machine or a printer includes a fixing device that fixes a toner image onto a recording medium such as paper.
- a general fixing device includes a fixing roller that forms an elastic layer on the outer periphery of a metal core, a pressure roller that presses against the fixing roller, and a heating device that is provided inside or outside the fixing roller.
- Such a fixing device is configured to fix the heated and melted toner on the paper by passing the paper on which the toner image is transferred through a fixing nip formed between the rotating rollers.
- the surface hardness of the fixing roller is set lower (softer) than the surface hardness of the pressure roller.
- the pressing force of the pressure roller has been set high for the purpose of speeding up image formation. This is because the distance between the fixing nips is increased by largely deforming the soft fixing roller (elastic layer).
- the elastic layer is greatly deformed in the axial direction, there is a problem that stress is concentrated on the interface between the core metal and the elastic layer, and the elastic layer is peeled off from the core metal at both ends in the axial direction.
- the fixing roller 101 having an endless belt 105 provided around the cored bar 103 with an elastic layer 104 interposed therebetween is pressed against the nip.
- a pressure roller 102 that forms a portion 106, and a fixing device 100 having a stepped portion G in which both ends of the elastic layer 104 of the fixing roller 101 are notched in contact with the endless belt 105 is proposed.
- This fixing device is configured to suppress interface peeling between the cored bar 103 and the elastic layer 104 because both ends of the elastic layer 102 that becomes the stepped-down portion G are not pressed by the pressure roller 104.
- the fixing device 100 described above cannot receive pressure from the pressure roller 102 at both ends of the elastic layer 104 that becomes the stepped-down portion G. Therefore, both end portions of the endless belt 105 facing the stepped portion G are bent toward the elastic layer 104 side at the nip portion 106 (see FIG. 4).
- the endless belt 105 bent by the rotation of the rollers 101 and 102 passes through the nip portion 106, the bent endless belt 105 returns to its original state by its own elastic force. Therefore, both end portions of the endless belt 105 are repeatedly bent along with the rotation of the rollers 101 and 102, and there is a possibility that the bent portion may be cracked. For this reason, there is a problem that the life of the fixing roller 101 is shortened.
- An advantage of some aspects of the invention is that it provides a fixing device capable of suppressing damage to a fixing roller accompanying an increase in pressure from a pressure roller and an image forming apparatus including the fixing device. To do.
- the fixing device of the present invention includes a fixing roller having a fixing belt heated by a heat source on the outer periphery of an elastic layer provided around a metal core, and a fixing that presses the fixing roller and passes a recording medium onto which a toner image is transferred.
- a pressure roller provided so as to form a nip, and annular grooves are recessed along the circumferential direction, spaced from the core metal and the fixing belt, on both axial end surfaces of the elastic layer.
- the bottom portion of the annular groove is configured to be located on the inner side of the both axial end surfaces of the pressure roller.
- the image forming apparatus of the present invention includes the above-described fixing device.
- the present invention it is possible to suppress the interface peeling between the cored bar and the elastic layer, to prevent the fixing belt from being damaged, and to increase the life of the fixing roller.
- FIG. 1 is a schematic diagram illustrating an outline of an internal structure of a color printer according to an embodiment of the present invention.
- 1 is a cross-sectional view schematically showing a fixing device according to an embodiment of the present invention.
- FIG. 3 is a sectional view taken along line III-III in FIG. 2.
- FIG. 10 is a cross-sectional view schematically illustrating a part of a conventional fixing device.
- the arrow Fr shown in FIGS. 1 and 2 is defined as the front side (front side) of the color printer.
- FIG. 1 is a schematic diagram showing an outline of the internal structure of the color printer 1.
- the color printer 1 includes an apparatus main body 2 that forms a main appearance, a paper feed cassette 3 that is provided below the apparatus main body 2 and stores paper P as a recording medium, and a paper discharge tray that is provided on the upper surface of the apparatus main body 2. 4 is provided.
- the recording medium is not limited to paper P, but may be a resin film, an OHP sheet, or the like.
- the color printer 1 includes a paper feeding unit 11 that supplies the paper P set in the paper feeding cassette 3 to the conveyance path 10, an image forming unit 13 that primarily transfers a toner image to the intermediate transfer belt 12, and toner that has been primarily transferred.
- a secondary transfer nip portion 14 that secondary-transfers the image onto the paper P, a fixing device 15 that fixes the secondary-transferred toner image onto the paper P, and a control device 16 that controls each device are provided in the apparatus main body 2. In preparation.
- the image forming unit 13 forms an image using toners for supply of four colors (yellow (Y), magenta (M), cyan (C), and black (K)) stored in the four toner containers 20. It is configured.
- the image forming unit 13 includes four drum units 21 and an exposure unit 22 that irradiates the surface of each photosensitive drum 24 with laser light (see arrow P shown in FIG. 1).
- Each drum unit 21 includes a photosensitive drum 24 as an image carrier that is rotatably supported, a charger 25 that is arranged around the photosensitive drum 24 in the order of the transfer process, a developing device 26, and a primary transfer roller 27. And a cleaning unit 28.
- the control device 16 When the color printer 1 is turned on, the control device 16 initializes various parameters such as the temperature setting of the fixing device 15. When a print start instruction or image data is input from a personal computer or the like connected to the color printer 1, the control device 16 executes an image forming operation as follows.
- each exposure device 22 On the surface of each photosensitive drum 24 charged to a predetermined potential by each charger 25.
- the electrostatic latent image formed on each photosensitive drum 24 is developed into a toner image by the toner of each color supplied from each toner container 20 to each developer 26.
- each color toner image is sequentially primary-transferred to the intermediate transfer belt 12, and a full-color toner image is formed on the intermediate transfer belt 12.
- the paper P supplied from the paper feed cassette 3 by the paper feed unit 11 is transported to the secondary transfer nip unit 14 through the transport path 10.
- the full color toner image is secondarily transferred to the paper P.
- the paper P is fixed on the fixing device 15 and then discharged onto the paper discharge tray 4.
- the toner remaining on each photosensitive drum 24 is removed by the cleaning unit 28.
- FIG. 2 is a cross-sectional view schematically showing the fixing device 15.
- 3 is a cross-sectional view taken along the line III-III in FIG.
- the fixing device 15 includes a fixing roller 30, a pressure roller 31, and an IH (Induction Heating) fixing unit 32.
- IH Induction Heating
- the fixing roller 30 is formed in a columnar shape that is long in the left-right direction (axial direction).
- the fixing roller 30 includes a fixing side elastic layer 34 provided on the outer periphery of the fixing side metal core 33 and a fixing belt 35 provided on the outer periphery of the fixing side elastic layer 34.
- the fixing belt 35 rotates as the fixing side metal core 33 and the fixing side elastic layer 34 rotate.
- the fixing-side metal core 33 is formed in a hollow cylindrical shape with a metal material such as stainless steel or aluminum.
- the left and right ends of the fixing-side metal core 33 are rotatably supported by a pair of bearings (not shown) provided in the apparatus main body 2.
- Both left and right end portions of the fixing side metal core 33 have stepped portions 33a and are formed in a small diameter (see FIG. 3).
- detent flanges 36 that extend outward in the radial direction are arranged at the left and right ends of the fixing-side metal core 33.
- Each detent flange 36 is formed in an annular shape.
- Each detent flange 36 is inserted inward in the axial direction from the end surface of the fixing side metal bar 33 until it abuts on the stepped portion 33 a, and is pulled out by fitting the stop ring 37 to the end part of the fixing side core metal 33. It is provided in a stopped state.
- Each detent flange 36 is attached to the fixing side metal core 33 so as to be rotatable relative to the fixing side metal core 33.
- the fixing-side elastic layer 34 is provided on the outer periphery of the fixing-side metal core 33 between the pair of left and right step portions 33a. Specifically, the axial length (left-right direction) length L1 of the fixing-side elastic layer 34 is configured to be slightly shorter than the distance D1 between the pair of left and right step portions 33a (detent flanges 36).
- the fixing-side elastic layer 34 is formed of a material having heat resistance and elasticity, such as a silicon sponge having a thickness of 10 mm, for example. The thickness of the above-described fixing-side elastic layer 34 is an example, and may be changed as appropriate.
- the fixing belt 35 is provided on the outer periphery of the fixing-side elastic layer 34.
- the axial direction (left-right direction) length L2 of the fixing belt 35 is slightly shorter than the distance D1 between the pair of left and right step portions 33a (detent flanges 36), and the fixing-side elastic layer 34 has a length L2. It is configured to be slightly longer than the axial length L1.
- the fixing belt 35 includes, for example, a belt-side elastic layer 41 provided around the base material 40 and a belt-side release layer 42 that covers the belt-side elastic layer 41. .
- the base material 40 is made of a metal material such as nickel having a thickness of 30 ⁇ m to 40 ⁇ m, for example.
- the belt-side elastic layer 41 is formed of a material having heat resistance and elasticity, such as silicon rubber having a thickness of 200 ⁇ m to 300 ⁇ m, for example.
- the belt side release layer 42 is formed of, for example, a PFA tube having a thickness of 30 ⁇ m.
- the thicknesses of the base material 40, the belt-side elastic layer 41, and the belt-side release layer 42 described above are examples, and may be changed as appropriate.
- the pressure roller 31 is formed in a columnar shape that is long in the left-right direction.
- the pressure roller 31 has a pressure-side release layer 52 provided around the pressure-side metal core 50 via the pressure-side elastic layer 51.
- the pressure side metal core 50 is formed in a hollow cylindrical shape with a metal material such as stainless steel or aluminum.
- the left and right ends of the pressure side metal core 50 are rotatably supported by a pair of bearings (not shown) provided in the apparatus main body 2.
- the left and right end portions of the pressure side metal core 50 have stepped portions 50a and are formed in a small diameter (see FIG. 3).
- the pressure side elastic layer 51 is provided on the outer periphery of the pressure side metal core 50 between the pair of left and right step portions 50a.
- the axial direction (left-right direction) length L3 of the pressure-side elastic layer 51 is substantially the same as the distance between the pair of left and right step portions 50a, and is longer than the axial length L1 of the fixing-side elastic layer 34. Is slightly shorter.
- the pressure-side elastic layer 51 is formed of a material having heat resistance and elasticity such as silicon rubber having a thickness of 2.0 mm, for example.
- the pressure side release layer 52 is provided on the outer periphery of the pressure side elastic layer 51.
- the axial direction (left-right direction) length L4 of the pressure side release layer 52 is substantially the same as the axial length L3 of the pressure side elastic layer 51.
- the pressure-side release layer 52 is formed of, for example, a 0.05 mm thick PFA tube.
- the thicknesses of the pressure-side elastic layer 51 and the pressure-side release layer 52 described above are examples, and may be changed as appropriate.
- the pressure roller 31 described above is configured to be rotationally driven by a drive mechanism (such as a motor and a gear train) (not shown).
- the fixing roller 30 is configured to be pressed against the pressure roller 31 by an urging force of an urging means (not shown), and to be driven to rotate in a direction opposite to the pressure roller 31.
- the fixing roller 30 may be rotationally driven, and the pressure roller 31 may be driven to rotate.
- the pressure roller 31 is provided so as to form a fixing nip N that is pressed against the fixing roller 30 and allows the paper P on which the toner image is transferred to pass therethrough.
- the fixing nip N is formed between the fixing roller 30 and the pressure roller 31 along the conveyance path 10 of the paper P.
- the surface hardness of the fixing roller 30 (mainly the hardness of the fixing side elastic layer 34 and the belt side elastic layer 41) is lower (softer) than the surface hardness of the pressure roller 31 (mainly the hardness of the pressure side elastic layer 51).
- the fixing roller 30 is crushed. That is, at the fixing nip N, the fixing-side elastic layer 34 and the fixing belt 35 are greatly displaced in the radial direction.
- the fixing-side elastic layer 34 and the fixing belt 35 are greatly displaced in the axial direction.
- the axial displacement is regulated by the pair of left and right detent flanges 36.
- An entrance guide 53 is disposed on the entrance side of the sheet P in the fixing nip N.
- the entry guide 53 is disposed on the pressure roller 31 side and is provided so as to guide the paper P conveyed on the conveyance path 10 to the fixing nip N.
- a separation plate 54 is disposed on the feeding side of the paper P in the fixing nip N.
- the separation plate 54 is urged toward the fixing belt 35 by urging means (not shown).
- the leading end of the separation plate 54 is provided slightly apart from the outer peripheral surface of the fixing belt 35.
- the paper P that has passed through the fixing nip N is separated from the fixing belt 35 by the separation plate 54.
- a temperature sensor that detects the temperature of the fixing belt 35 is provided in the vicinity of the fixing roller 30.
- the IH fixing unit 32 is provided on the opposite side of the fixing nip N with the fixing roller 30 interposed therebetween as a heat source for heating the fixing belt 35.
- the IH fixing unit 32 includes a substantially semi-cylindrical bobbin 60 that covers the fixing roller 30, an IH coil 61 that is supported by the bobbin 60, and an arch core 62 and a pair of side cores 63 that are provided so as to cover the IH coil 61. I have.
- the IH coil 61 is disposed on the opposite side of the fixing belt 35 with the bobbin 60 interposed therebetween. That is, the IH fixing unit 32 is configured as a so-called “external package IH”.
- the arch core 62 and the pair of side cores 63 are made of, for example, ferrite. Each of the cores 62 and 63 is provided to form a magnetic path through which the magnetic flux generated from the IH coil 61 passes.
- the control device 16 provided in the color printer 1 includes a storage unit such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an interface (none of which are shown). ing.
- the control device 16 is connected to each device of the color printer 1 including the fixing device 15.
- the control device 16 is configured to centrally control the color printer 1 based on programs and data stored in the storage unit.
- the control device 16 drives and controls the IH fixing unit 32 (IH coil 61) based on the detection result of the temperature sensor. Specifically, the control device 16 sends a drive signal to a coil drive unit (not shown), and the coil drive unit supplies a high-frequency current to the IH coil 61. As a result, the fixing belt 35 is heated by the high-frequency magnetic field generated in the IH coil 61. Further, the control device 16 controls the drive mechanism to rotate the pressure roller 31. Accordingly, the fixing roller 30 that forms the fixing nip N with the pressure roller 31 is driven to rotate.
- the paper P on which the toner image has been transferred passes through the fixing nip N and is subjected to a fixing process. Specifically, when the sheet P passes through the fixing nip N, the sheet P is heated by the fixing roller 30 (fixing belt 35) and pressed by the pressure roller 31. As a result, the toner on the paper P is heated and pressurized and fixed to the paper P.
- the rotation speeds of the rollers 30 and 31 of the fixing device 15 are also increased.
- the pressing force of the pressure roller 31 against the fixing roller 30 is set high.
- the soft fixing roller 30 is greatly deformed and the distance of the fixing nip N is increased, so that proper toner fixing can be ensured.
- the fixing side elastic layer 34 of the fixing roller 30 is largely crushed in the fixing nip N, the interface peeling between the fixing side metal core 33 and the fixing side elastic layer 34 and the left and right ends (axial direction) of the fixing belt 35 are performed. There is a possibility that problems such as bending of the end portion may occur.
- the fixing device 15 includes an annular groove 70 that is recessed inward from both axial end surfaces S ⁇ b> 1 of the fixing-side elastic layer 34.
- Each annular groove 70 is recessed along the circumferential direction at a distance from the fixing side metal core 33 and the fixing belt 35 at both axial end surfaces S1 of the fixing side elastic layer 34.
- both ends of each roller 30 and 31 are respectively substantially the same shape, suppose that it pays attention to one edge part in the following description.
- the annular groove 70 is formed at a substantially intermediate portion of the thickness of the fixing-side elastic layer 34.
- the annular groove 70 is recessed substantially inward from the end surface S1 of the fixing-side elastic layer 34, and the bottom 71 of the annular groove 70 has a semicircular cross section. That is, the annular groove 70 has a substantially U-shaped cross section, and the end of the fixing-side elastic layer 34 is formed in an arch shape due to the presence of the annular groove 70. Therefore, the fixing side elastic layer 34 is provided on the inner side and the outer side in the radial direction of the annular groove 70 so as to contact the fixing side core metal 33 and the fixing belt 35 with a predetermined thickness.
- the portion in contact with the fixing side metal core 33 and the fixing belt 35 is referred to as an “elastic support portion 72”.
- the bottom 71 of the annular groove 70 is configured to be located on the inner side of the axial end surface S3 of the pressure roller 31 (the pressure-side elastic layer 51 and the pressure-side release layer 52).
- the axial length L1 of the fixing-side elastic layer 34 is shorter than the axial length L2 of the fixing belt 35, and the axial length of the pressing-side elastic layer 51 (the pressing-side release layer 52). It is configured to be longer than L3 (L4). That is, the pressure-side elastic layer 51 (pressure-side release layer 52), the fixing-side elastic layer 34, and the fixing belt 35 are formed so that the axial length becomes longer in the order (L3 (L4) ⁇ L1 ⁇ L2). Yes. For this reason, the end surface S ⁇ b> 2 of the fixing belt 35 is configured to be positioned outside the end surface S ⁇ b> 3 of the pressure roller 31.
- the end surface S1 of the fixing-side elastic layer 34 is configured to be positioned outside the end surface S3 of the pressure roller 31 and to be positioned inside the end surface S2 of the fixing belt 35.
- the radially outer elastic support portion 72 is configured to support the end portion of the fixing belt 35 and receive a pressing force from the pressure roller 31.
- the elastic support portion 72 on the radially inner side is in contact with the fixing side metal core 33.
- an effective pressurizing region D2 of the fixing nip N is formed between the bottoms 71 of the pair of left and right annular grooves 70.
- the effective pressure area D2 is set to a length that allows an appropriate fixing process to be performed on the maximum size paper P on which image formation is possible.
- the both end surfaces S1 of the fixing-side elastic layer 34 are left with portions (elastic support portions 72) that are in contact with the fixing-side metal core 33 and the fixing belt 35,
- An annular groove 70 is recessed. That is, when the fixing roller 30 is viewed from the axial direction, the fixing side metal core 33, the fixing side elastic layer 34, the annular groove 70 (space formed by), the fixing side elastic layer 34, and the fixing belt 35 are laminated. Further, the annular groove 70 is recessed to the inner side of the axial end surfaces S3 of the pressure roller 31.
- the pressure applied by the pressure roller 31 to both axial ends of the fixing roller 30 directly acts on the interface between the fixing side metal core 33 and the fixing side elastic layer 34 due to the presence of the annular groove 70. There is no. Thereby, stress concentration at the interface between the fixing side metal core 33 and the fixing side elastic layer 34 is suppressed, and interface peeling between the fixing side metal core 33 and the fixing side elastic layer 34 can be suppressed.
- the fixing-side elastic layer 34 existing on the radially inner side of the fixing belt 35 can receive pressure applied by the pressure roller 31 at both axial ends of the fixing roller 30.
- both end surfaces S1 in the axial direction of the fixing-side elastic layer 34 are positioned outside both end surfaces S3 in the axial direction of the pressure roller 31, the pressure from the pressure roller 31 can be appropriately received. Thereby, the bending of the both end portions of the fixing belt 35 is suppressed, and damage due to repeated bending stress can be suppressed.
- the fixing-side elastic layer 34 displaced in the axial direction may be damaged by coming into contact with the end of the base material 40 (nickel) of the fixing belt 35.
- the fixing device 15 according to the present embodiment since both end surfaces S1 in the axial direction of the fixing-side elastic layer 34 are located inside the both end surfaces S2 in the axial direction of the fixing belt 35, the fixing-side elasticity The axially opposite ends of the layer 34 are prevented from being displaced in the axial direction and coming into contact with the edges (both ends) of the fixing belt 35. As a result, it is possible to effectively prevent the axial end portions of the fixing-side elastic layer 34 from being damaged.
- the fixing device 15 since the bottom 71 of the annular groove 70 has a semicircular cross section, the end of the fixing-side elastic layer 34 is formed in an arch shape. Therefore, the pressure applied from the pressure roller 31 to the end of the fixing-side elastic layer 34 via the fixing belt 35 can be dispersed. Thereby, stress concentration can be suppressed and damage to the fixing-side elastic layer 34 constituting the annular groove 70 can be prevented.
- the color printer 1 including the fixing device 15 it is possible to suppress interfacial peeling between the fixing side metal core 33 and the fixing side elastic layer 34 at both axial ends of the fixing roller 30.
- the bottom 71 of the annular groove 70 has a semicircular cross section in order to prevent damage to the fixing-side elastic layer 34
- the present invention is not limited to this.
- the bottom 71 of the annular groove 70 may be formed to have a rectangular cross section or a triangular (V-shaped) cross section.
- the fixing belt 35 is stretched between the fixing roller 30 (the fixing side metal core 33 and the fixing side elastic layer 34) and one or more other rollers (for example, a tension roller). It may be.
- the above description of the embodiment of the present invention describes a preferred embodiment of the fixing device according to the present invention and an image forming apparatus including the fixing device, and various technically preferable limitations are attached.
- the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention.
- the components in the embodiment of the present invention described above can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible.
- the description of the embodiment of the present invention described above does not limit the contents of the invention described in the claims.
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Abstract
Description
Claims (6)
- 芯金の周りに設けられる弾性層の外周に熱源によって加熱される定着ベルトを有する定着ローラーと、
前記定着ローラーに圧接し、トナー像を転写した記録媒体を通過させる定着ニップを形成するように設けられる加圧ローラーと、を備え、
前記弾性層の軸方向両端面には、前記芯金と前記定着ベルトとから離間して周方向に沿って環状溝が凹設され、
前記環状溝の底部は、前記加圧ローラーの軸方向両端面よりも内側に位置するように構成されていることを特徴とする定着装置。 - 前記定着ベルトの軸方向両端面は、前記加圧ローラーの軸方向両端面よりも外側に位置するように構成され、
前記弾性層の軸方向両端面は、前記加圧ローラーの軸方向両端面よりも外側に位置すると共に、前記定着ベルトの軸方向両端面よりも内側に位置するように構成されている、請求項1に記載の定着装置。 - 前記環状溝の底部は、半円形断面を有している、請求項1に記載の定着装置。
- 前記芯金の軸方向両端部には、それぞれ、径方向外側に向けて延出する寄り止めフランジが配置され、
前記弾性層の軸方向長さは、一対の寄り止めフランジの間の距離よりも短く構成されている、請求項1に記載の定着装置。 - 前記定着ローラーの表面硬度は、前記加圧ローラーの表面硬度よりも低く設定されている、請求項1に記載の定着装置。
- 請求項1に記載の定着装置を備えることを特徴とする画像形成装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201480002239.0A CN104823116B (zh) | 2013-11-21 | 2014-08-27 | 定影装置以及具有该定影装置的图像形成装置 |
JP2015509248A JP5864814B2 (ja) | 2013-11-21 | 2014-08-27 | 定着装置およびこれを備える画像形成装置 |
US14/434,946 US9250588B1 (en) | 2013-11-21 | 2014-08-27 | Fixing device and image forming apparatus including this |
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JP2013-240742 | 2013-11-21 | ||
JP2013240742 | 2013-11-21 |
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WO2015075987A1 true WO2015075987A1 (ja) | 2015-05-28 |
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PCT/JP2014/072407 WO2015075987A1 (ja) | 2013-11-21 | 2014-08-27 | 定着装置およびこれを備える画像形成装置 |
Country Status (4)
Country | Link |
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US (1) | US9250588B1 (ja) |
JP (1) | JP5864814B2 (ja) |
CN (1) | CN104823116B (ja) |
WO (1) | WO2015075987A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10604831B2 (en) | 2014-05-16 | 2020-03-31 | Applied Materials, Inc. | Plasma spray coating design using phase and stress control |
Citations (4)
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JP2005043476A (ja) * | 2003-07-23 | 2005-02-17 | Toshiba Corp | 画像形成装置の定着装置および画像形成装置 |
JP2005164931A (ja) * | 2003-12-02 | 2005-06-23 | Nissei Electric Co Ltd | 定着用加圧ローラ |
JP2007108212A (ja) * | 2005-10-11 | 2007-04-26 | Konica Minolta Business Technologies Inc | 定着装置 |
JP2013061499A (ja) * | 2011-09-14 | 2013-04-04 | Konica Minolta Business Technologies Inc | 定着装置及び画像形成装置 |
Family Cites Families (4)
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JP4251230B2 (ja) * | 2006-10-10 | 2009-04-08 | 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 |
JP5326550B2 (ja) * | 2008-12-22 | 2013-10-30 | コニカミノルタ株式会社 | 定着装置及びそれを備えた画像形成装置 |
JP5282311B2 (ja) * | 2010-05-27 | 2013-09-04 | コニカミノルタ株式会社 | 定着装置及び画像形成装置 |
JP5527123B2 (ja) * | 2010-09-10 | 2014-06-18 | コニカミノルタ株式会社 | 定着装置 |
-
2014
- 2014-08-27 WO PCT/JP2014/072407 patent/WO2015075987A1/ja active Application Filing
- 2014-08-27 CN CN201480002239.0A patent/CN104823116B/zh not_active Expired - Fee Related
- 2014-08-27 US US14/434,946 patent/US9250588B1/en not_active Expired - Fee Related
- 2014-08-27 JP JP2015509248A patent/JP5864814B2/ja not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005043476A (ja) * | 2003-07-23 | 2005-02-17 | Toshiba Corp | 画像形成装置の定着装置および画像形成装置 |
JP2005164931A (ja) * | 2003-12-02 | 2005-06-23 | Nissei Electric Co Ltd | 定着用加圧ローラ |
JP2007108212A (ja) * | 2005-10-11 | 2007-04-26 | Konica Minolta Business Technologies Inc | 定着装置 |
JP2013061499A (ja) * | 2011-09-14 | 2013-04-04 | Konica Minolta Business Technologies Inc | 定着装置及び画像形成装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10604831B2 (en) | 2014-05-16 | 2020-03-31 | Applied Materials, Inc. | Plasma spray coating design using phase and stress control |
US11578398B2 (en) | 2014-05-16 | 2023-02-14 | Applied Materials, Inc. | Plasma spray coating design using phase and stress control |
Also Published As
Publication number | Publication date |
---|---|
US20160026133A1 (en) | 2016-01-28 |
JP5864814B2 (ja) | 2016-02-17 |
CN104823116B (zh) | 2017-04-26 |
CN104823116A (zh) | 2015-08-05 |
JPWO2015075987A1 (ja) | 2017-03-16 |
US9250588B1 (en) | 2016-02-02 |
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