WO2015162977A1 - 定着装置及び画像形成装置 - Google Patents
定着装置及び画像形成装置 Download PDFInfo
- Publication number
- WO2015162977A1 WO2015162977A1 PCT/JP2015/054098 JP2015054098W WO2015162977A1 WO 2015162977 A1 WO2015162977 A1 WO 2015162977A1 JP 2015054098 W JP2015054098 W JP 2015054098W WO 2015162977 A1 WO2015162977 A1 WO 2015162977A1
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- WIPO (PCT)
- Prior art keywords
- fixing belt
- fixing device
- fixing
- cap member
- peripheral surface
- Prior art date
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Classifications
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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
- 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 sheet (recording medium) and an image forming apparatus including the fixing device.
- an electrophotographic image forming apparatus such as a copying machine or a printer includes a fixing device that fixes a toner image on a sheet (recording medium).
- Patent Document 1 discloses a fixing belt (see “Fixing Film 20” in Patent Document 1), a cap member (see “driven ring 34” in Patent Document 1) attached to an end of the fixing belt, and fixing.
- a fixing device including an elastic member see “elastic member 33” in Patent Document 1) interposed between a belt and a cap member is disclosed.
- an object of the present invention is to prevent the lubricant from entering between the cap member and the elastic member, and to prevent slippage between the cap member and the elastic member. .
- the fixing device includes a fixing belt that rotates around a rotation shaft, a pressure member that presses against the fixing belt to form a fixing nip, a cap member that is attached to an end of the fixing belt, An elastic member interposed between the fixing belt and the cap member, the cap member covering the outer side in the rotation axis direction of the end portion of the fixing belt, and the rotation from the main body portion.
- a flange portion extending inward in the axial direction and covering the outer diameter side of the end portion of the fixing belt, and a step is formed on the inner peripheral surface of the flange portion, and the outer peripheral surface of the elastic member Is in contact with a portion on the inner side in the rotational axis direction of the step of the inner peripheral surface of the flange portion.
- the image forming apparatus of the present invention includes the above-described fixing device.
- the present invention it is possible to suppress the lubricant from entering between the cap member and the elastic member, and to prevent the occurrence of slip between the cap member and the elastic member.
- FIG. 1 is a schematic diagram illustrating an outline of a configuration of a color printer according to an embodiment of the present invention.
- 1 is a cross-sectional view illustrating a fixing device according to an embodiment of the present invention.
- 1 is a perspective view showing a fixing device according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view illustrating a front end portion of a fixing device according to an embodiment of the present invention.
- FIG. 3 is a perspective cross-sectional view showing a cap member and an elastic member in the fixing device according to the embodiment of the present invention.
- FIG. 3 is a perspective view showing a cap member in the fixing device according to the embodiment of the present invention.
- FIG. 3 is a cross-sectional view illustrating a fixing belt, a cap member, and an elastic member in the fixing device according to the embodiment of the present disclosure.
- FIG. 3 is a cross-sectional view showing a front end portion of the fixing belt and its periphery in the fixing device according to the embodiment of the present invention.
- FIG. 4 is a cross-sectional view showing a cap member and a mold for manufacturing the cap member in the fixing device according to the embodiment of the present invention.
- FIG. 6 is a cross-sectional view illustrating a front end portion of a fixing device according to another different embodiment of the present invention.
- the color printer 1 includes a box-shaped printer main body 2, a paper feed cassette 3 that stores paper (not shown) is provided at the bottom of the printer main body 2, and paper is discharged at the top of the printer main body 2.
- a tray 4 is provided.
- An intermediate transfer belt 6 is installed between a plurality of rollers in the center of the printer main body 2, and an exposure device 7 composed of a laser scanning unit (LSU) is disposed below the intermediate transfer belt 6. Yes.
- LSU laser scanning unit
- four image forming portions 8 are provided for each toner color (for example, four colors of magenta, cyan, yellow, and black) along the lower portion of the intermediate transfer belt 6.
- Each image forming unit 8 is rotatably provided with a photosensitive drum 9, and around the photosensitive drum 9, a charger 10, a developing unit 11, a primary transfer unit 12, and a cleaning device 13 are provided.
- the static eliminator 14 is arranged in the order of the primary transfer process.
- Above the developing unit 11, a toner container 15 corresponding to each image forming unit 8 is provided for each toner color.
- a paper transport path 16 is provided on one side of the printer body 2 (right side in the drawing).
- a paper feed unit 17 is provided at the upstream end of the conveyance path 16, and a secondary transfer unit 18 is provided at one end (right end in the drawing) of the intermediate transfer belt 6 at a middle portion of the conveyance path 16, and downstream of the conveyance path 16.
- a fixing device 19 is provided in the section, and a paper discharge port 20 is provided at the downstream end of the transport path 16.
- an image forming operation of the color printer 1 having such a configuration will be described.
- various parameters are initialized, and initial settings such as temperature setting of the fixing device 19 are executed.
- image data is input from a computer or the like connected to the color printer 1 and an instruction to start printing is given, an image forming operation is executed as follows.
- an electrostatic latent image is formed on the surface of the photosensitive drum 9 by the laser light (see arrow P) from the exposure device 7.
- the electrostatic latent image is developed into a toner image of a corresponding color by the developing device 11 with the toner supplied from the toner container 15.
- This toner image is primarily transferred to the surface of the intermediate transfer belt 6 in the primary transfer portion 12.
- Each image forming unit 8 sequentially repeats the above operation, whereby a full-color toner image is formed on the intermediate transfer belt 6. Note that the toner and charge remaining on the photosensitive drum 9 are removed by the cleaning device 13 and the static eliminator 14.
- the paper taken out from the paper feed cassette 3 or the hand tray (not shown) by the paper feed unit 17 is conveyed to the secondary transfer unit 18 in synchronization with the above-described image forming operation, and is subjected to secondary transfer.
- the full-color toner image on the intermediate transfer belt 6 is secondarily transferred to the paper.
- the sheet on which the toner image has been secondarily transferred is conveyed downstream in the conveyance path 16 and enters the fixing device 19, where the toner image is fixed on the sheet.
- the sheet on which the toner image is fixed is discharged from the discharge port 20 onto the discharge tray 4.
- an arrow Z in FIG. 2 indicates the sheet conveyance direction.
- an arrow Fr appropriately attached to each drawing indicates the front side (front side) of the fixing device 19.
- an arrow I appropriately attached to each figure indicates an inner side in the front-rear direction
- an arrow O appropriately attached to each figure indicates an outer side in the front-rear direction.
- the fixing device 19 includes a fixing belt 21, a pressure roller 22 (pressure member) provided on the right side of the fixing belt 21, and an IH fixing provided on the left side of the fixing belt 21.
- a unit 23 a support member 24 provided substantially in the center of the fixing belt 21, a pressure pad 25 (pressing member) provided on the right side of the support member 24 inside the fixing belt 21, and a support inside the fixing belt 21.
- Magnetic shield plates 26 provided on the upper and lower sides and the left side of the member 24, guide plates 27 (guide members) provided on the upper and lower sides and the left side of the magnetic shield plate 26 in the fixing belt 21, and both front and rear ends of the fixing belt 21
- Cap members 28 attached to 21a and 21b (front end 21a and rear end 21b), and both front and rear ends 21a and 21 of the fixing belt 21, respectively.
- it includes an elastic member 29 interposed between the cap member 28, a rotation detection mechanism 30 provided on the lower side of the front of the cap member 28, the.
- the fixing belt 21 (see FIG. 2, FIG. 3 and the like) is endless in the circumferential direction and has a substantially cylindrical shape that is long in the front-rear direction.
- the fixing belt 21 is provided to be rotatable around a rotation axis X extending in the front-rear direction. That is, in the present embodiment, the front-rear direction is the rotation axis direction of the fixing belt 21.
- a lubricant composed of, for example, fluorine grease or silicon oil is applied to the inner peripheral surface of the fixing belt 21.
- a bulging portion 31 is formed on the upper right portion of the fixing belt 21.
- One clamping portion 32 is formed at the lower left portion of the fixing belt 21.
- the sandwiching portion 32 is disposed on the opposite side of the bulging portion 31 with the rotation axis X of the fixing belt 21 interposed therebetween.
- the fixing belt 21 includes, for example, a base material layer, an elastic layer provided around the base material layer, and a release layer that covers the elastic layer.
- the base material layer of the fixing belt 21 is formed by, for example, plating or rolling a metal such as nickel or copper.
- the elastic layer of the fixing belt 21 is made of, for example, silicon rubber.
- the release layer of the fixing belt 21 is formed of a fluorine resin such as PFA, for example. In each figure, each layer (base material layer, elastic layer, release layer) of the fixing belt 21 is displayed without being particularly distinguished.
- the pressure roller 22 (see FIGS. 2 and 3 etc.) has a substantially cylindrical shape that is long in the front-rear direction.
- the pressure roller 22 is in pressure contact with the fixing belt 21, and a fixing nip 35 is formed between the fixing belt 21 and the pressure roller 22 along the sheet conveyance path 16.
- the above-described bulging portion 31 of the fixing belt 21 is provided on the upper side of the fixing nip 35 (on the downstream side in the sheet conveyance direction).
- the pressure roller 22 includes, for example, a cylindrical core member 36, an elastic layer 37 provided around the core member 36, and a release layer (not shown) that covers the elastic layer 37. Yes.
- the core material 36 of the pressure roller 22 is made of a metal such as stainless steel or aluminum. Both front and rear ends of the core member 36 of the pressure roller 22 are rotatably supported by a fixing frame (not shown).
- a drive gear 33 is fixed to the rear end portion of the core member 36 of the pressure roller 22.
- the drive gear 33 is connected to a drive unit 34 constituted by a motor or the like.
- the elastic layer 37 of the pressure roller 22 is made of, for example, silicon rubber or silicon sponge.
- the release layer of the pressure roller 22 is formed of, for example, a fluorine resin such as PFA.
- the IH fixing unit 23 (see FIG. 2) is housed in the case member 38, the case member 38, the IH coil 40 (heat source) provided in an arc shape along the outer periphery of the fixing belt 21, and the case member 38. And an arch core 41 provided along the outer periphery of the IH coil 40.
- the IH fixing unit 23 is not shown except for FIG.
- the support member 24 (see FIG. 2 and the like) is formed by combining a pair of sheet metal members 42 having a substantially L-shaped cross section, and has a rectangular tube shape that is long in the front-rear direction.
- Fixing pieces 46 (see FIGS. 3 and 4) are fixed to both front and rear ends of the support member 24. A portion on the inner side in the front-rear direction of each fixed piece 46 is inserted into the support member 24.
- Each fixing piece 46 is provided with a locking projection 47 on the outer side in the front-rear direction of the portion inserted into the support member 24.
- a stopper 48 is fixed to the outer periphery of the outer portion of each fixing piece 46 in the front-rear direction. An end portion on the outer side in the front-rear direction of each fixing piece 46 is fixed to a fixing frame (not shown).
- the pressing pad 25 (see FIG. 2) has a long shape in the front-rear direction.
- the pressing pad 25 is made of a heat resistant resin such as LCP (liquid crystal polymer).
- LCP liquid crystal polymer
- a pressing surface 49 is formed on the right surface of the pressing pad 25.
- the pressing surface 49 presses the fixing belt 21 toward the right side (pressure roller 22 side).
- the pressing surface 49 is inclined on the right side (pressure roller 22 side) toward the upper side (downstream side in the sheet conveyance direction).
- the bulging portion 31 of the fixing belt 21 provided on the upper side of the fixing nip 35 (downstream in the sheet conveying direction) bulges to the outer diameter side.
- the magnetic shielding plate 26 (see FIG. 2) is fixed to the support member 24.
- the magnetic shielding plate 26 is made of a nonmagnetic and highly conductive material such as oxygen-free copper, for example.
- the magnetic shielding plate 26 includes a side plate 50 that covers the left side of the support member 24, and upper and lower plates 51 that are bent from the upper and lower end portions of the side plate 50 toward the right side, and has a substantially U-shaped cross section. ing.
- the magnetic shielding plate 26 prevents the magnetism from the IH coil 40 from penetrating the support member 24.
- the guide plate 27 (see FIG. 2) is fixed to the magnetic shielding plate 26.
- the guide plate 27 is made of a magnetic material, for example.
- the guide plate 27 includes an upper attachment portion 52 attached to the upper plate 51 of the magnetic shielding plate 26, a lower attachment portion 53 attached to the lower plate 51 of the magnetic shielding plate 26, an upper attachment portion 52, and a lower attachment portion 53.
- a curved portion 54 that is curved in an arc shape toward the left side.
- the curved portion 54 is disposed along the left side portion of the inner peripheral surface of the fixing belt 21 and guides the fixing belt 21 from the inside.
- Each cap member 28 (see FIGS. 4 to 6 and the like) includes an annular main body portion 55, a flange portion 56 extending inward in the front-rear direction from the outer diameter side end portion of the main body portion 55, and a main body portion.
- the insertion cylinder part 57 extended toward the front-back direction outer side from the edge part of the inner diameter side of 55, and the gear part 58 which protrudes toward the front-back direction outer side from the radial direction center part of the main-body part 55 are provided.
- each cap member 28 covers the front and rear ends of the front and rear ends 21a and 21b of the fixing belt 21. As a result, the meandering of the fixing belt 21 (movement of the fixing belt 21 outward in the front-rear direction) is restricted.
- An annular non-contact portion 59 is formed on the inner surface in the front-rear direction of the main body 55.
- the non-contact portion 59 is a portion that does not contact the front and rear end portions 21 a and 21 b of the fixing belt 21 even when the fixing belt 21 meanders.
- An annular contactable portion 60 is formed on the outer diameter side of the non-contact portion 59 on the inner surface in the front-rear direction of the main body portion 55.
- the contactable portion 60 is a portion that may come into contact with the front and rear end portions 21 a and 21 b of the fixing belt 21 when the fixing belt 21 meanders. Note that a two-dot chain line Y appropriately attached to each drawing indicates a boundary between the non-contact portion 59 and the contactable portion 60.
- the flange portion 56 of each cap member 28 covers the outer diameter side of the front and rear end portions 21a and 21b of the fixing belt 21.
- a step S is formed on the inner peripheral surface 63 of the flange portion 56.
- a portion of the inner peripheral surface 63 of the flange portion 56 on the inner side in the front-rear direction with respect to the step S is referred to as an “inner portion 61”.
- the portion is referred to as “outer portion 62”.
- the step S is formed such that the inner portion 61 is located on the outer diameter side of the outer portion 62.
- the inner portion 61 has a larger inner diameter than the outer portion 62 and is longer in the front-rear direction than the outer portion 62.
- a facing portion 65 is provided at the upper right portion of the inner portion 61 of the inner peripheral surface 63 of the flange portion 56.
- the facing portion 65 faces the bulging portion 31 of the fixing belt 21, and the elastic member 29 is sandwiched between the bulging portion 31 of the fixing belt 21.
- the other clamping portion 66 is provided on the lower left side of the inner portion 61 of the inner peripheral surface 63 of the flange portion 56.
- the other clamping portion 66 is disposed on the opposite side of the facing portion 65 across the rotation axis X of the fixing belt 21.
- the other clamping portion 66 faces the one clamping portion 32 of the fixing belt 21, and sandwiches the elastic member 29 between the one clamping portion 32 of the fixing belt 21.
- each fixing piece 46 is loosely inserted into the insertion tube portion 57 of each cap member 28.
- the insertion tube portion 57 is disposed on the inner side in the front-rear direction of the stopper 48 fixed to each fixing piece 46. Thereby, the movement to the front-back direction outer side of each cap member 28 is controlled.
- Each elastic member 29 (see FIGS. 4 and 5 etc.) has a cylindrical shape.
- Each elastic member 29 is formed of a liquid-absorbing material (silicon sponge, which is a foam material in this embodiment).
- the outer peripheral surface of each elastic member 29 is in contact with the inner portion 61 of the inner peripheral surface 63 of the flange portion 56 of each cap member 28.
- Each elastic member 29 is attached to each cap member 28 along a step S formed on the inner peripheral surface 63 of the flange portion 56 of each cap member 28. Therefore, the outer diameter side portion of the outer surface in the front-rear direction of each elastic member 29 is in contact with the step S.
- each cap member 28 is surrounded by the inner surface in the front-rear direction, the outer portion 62 of the inner peripheral surface 63 of the flange portion 56 of each cap member 28, and the outer surface in the front-rear direction of each elastic member 29.
- a lubricant holding part 67 is formed in the space.
- the rotation detection mechanism 30 (see FIGS. 3 and 4) includes a detected member 69 and a detection unit 70 disposed on the front side of the detected member 69.
- the detected member 69 includes a detection gear 71, a pulse plate 72 disposed on the front side of the detection gear 71, and a connection shaft 73 that connects the detection gear 71 and the pulse plate 72.
- the detection gear 71 is connected to the gear portion 58 of the front cap member 28 via an idle gear 74.
- the pulse plate 72 is provided with three pulse pieces 75 at equal intervals in the circumferential direction.
- the detection unit 70 is, for example, a PI sensor (Photo Interrupter Sensor), and includes a light emitting unit 76 and a light receiving unit 77.
- a high-frequency current is passed through the IH coil 40 when fixing a toner image on a sheet.
- the IH coil 40 generates a magnetic field
- an eddy current is generated in the fixing belt 21 by the action of the magnetic field
- the fixing belt 21 generates heat. That is, the fixing belt 21 is heated by the IH coil 40.
- the guide plate 27 generates heat by the magnetic field generated by the IH coil 40, and the fixing belt 21 is heated by the guide plate 27.
- the drive gear 33 is rotated by the drive unit 34.
- the pressure roller 22 rotates integrally with the drive gear 33 (see arrow A in FIG. 2).
- the fixing belt 21 in pressure contact with the pressure roller 22 rotates following the rotation of the pressure roller 22 (see arrow B in FIG. 2).
- the fixing belt 21 rotates in this way, the fixing belt 21 slides with respect to the pressing pad 25. In this state, when the sheet passes through the fixing nip 35, the sheet and the toner image are heated and pressurized to fix the toner image on the sheet.
- the fixing belt 21 is rotated by the rotation of the pressure roller 22 as in the present embodiment, if a slip occurs between the pressure roller 22 and the fixing belt 21, the fixing belt 21 is rotated. There is a risk that a part of the fixing belt 21 is locally heated by the IH coil 40. Therefore, in this embodiment, the rotation state of the fixing belt 21 is grasped as follows.
- each cap member 28 and each elastic member 29 rotate integrally with the fixing belt 21.
- the rotation of the front cap member 28 is transmitted to the detected member 69 via the idle gear 74, and the detected member 69 rotates.
- the detected member 69 rotates in this way, the light emitted from the light emitting unit 76 of the detecting unit 70 toward the light receiving unit 77 is intermittently blocked by each pulse piece 75 of the pulse plate 72 of the detected member 69. Therefore, the amount of light received by the light receiving unit 77 of the detection unit 70 is alternately switched between High and Low.
- the rotation detection mechanism 30 detects the rotation of the front cap member 28.
- the cap members 28 are also stopped, and the rotation detection mechanism 30 does not detect the rotation of the front cap member 28.
- the rotation state of the fixing belt 21 is grasped through the rotation detection of the front cap member 28. Accordingly, a situation in which a part of the fixing belt 21 is locally heated by the IH coil 40 can be avoided.
- the lubricant is applied to the inner peripheral surface of the fixing belt 21.
- this lubricant wraps around the outer peripheral surface of the fixing belt 21 via a gap between the front end portion 21 a of the fixing belt 21 and the main body portion 55 of the front cap member 28.
- the lubricant enters between the inner peripheral surface 63 of the flange portion 56 of the front cap member 28 and the outer peripheral surface of the front elastic member 29, the front cap member 28 and the front elastic member 29
- the front cap member 28 and the front elastic member 29 There is a risk of slipping between the two. When slip occurs in this way, the front cap member 28 cannot be rotated integrally with the fixing belt 21, and it is difficult to accurately grasp the rotation state of the fixing belt 21.
- a step S is formed on the inner peripheral surface 63 of the flange portion 56 of each cap member 28, and the outer peripheral surface of each elastic member 29 is inside the inner peripheral surface 63 of the flange portion 56 of each cap member 28. It is in contact with the portion 61. Therefore, even if the lubricant applied to the inner peripheral surface of the fixing belt 21 wraps around the outer peripheral surface of the fixing belt 21, the inner peripheral surface 63 of the flange portion 56 of the front cap member 28 and the front elastic member 29 It becomes difficult for the lubricant to enter between the outer peripheral surfaces. Along with this, it is possible to prevent the occurrence of slip between the front cap member 28 and the front elastic member 29, so that the rotational state of the fixing belt 21 can be accurately grasped. Further, each cap member 28 can be more stably held by the fixing belt 21.
- a step S is formed so that the inner portion 61 is positioned on the outer diameter side with respect to the outer portion 62, and each elastic member 29 is attached to each cap member 28 along the step S.
- the step S can be used as an attachment reference for each elastic member 29, so that each elastic member 29 can be arranged at an appropriate position.
- the front-rearward inner surface of the main body 55 of each cap member 28, the outer portion 62 of the inner peripheral surface 63 of the flange portion 56 of each cap member 28, and the front-rear outer surface of each elastic member 29 A lubricant holding portion 67 is formed in the enclosed space.
- each elastic member 29 is formed of a liquid-absorbing material (silicon sponge). Therefore, a part of the lubricant held by the lubricant holding portion 67 is absorbed by each elastic member 29. It becomes possible to make it. Accordingly, it is possible to more effectively suppress the lubricant from entering between the inner peripheral surface 63 of the flange portion 56 of the front cap member 28 and the outer peripheral surface of the front elastic member 29.
- each cap member 28 and each elastic member 29 rotate integrally with the fixing belt 21.
- a mold 80 for manufacturing the cap member 28 includes a cavity 81 and a core 82 partially inserted into the cavity 81.
- the cavity 81 is provided with an inlet 83 for pouring resin between the cavity 81 and the core 82.
- a pin member 84 composed of an ejector pin, a sleeve pin, or the like is attached to the core 82.
- the cap member 28 When the cap member 28 is manufactured, first, resin is poured between the cavity 81 and the core 82 through the injection port 83 of the cavity 81 to mold the cap member 28. Next, as shown by an arrow D in FIG. 9, the cavity 81 is moved away from the core 82. Along with this, the cap member 28, which is a molded product, is released from the cavity 81. Next, as indicated by an arrow E in FIG. 9, the pin member 84 is projected toward the non-contact portion 59 of the main body portion 55 of the cap member 28. Along with this, the cap member 28 is released from the core 82.
- the pin member 84 protrudes toward the non-contact portion 59 of the main body 55 of the cap member 28 when the cap member 28 is manufactured, the non-contact portion 59 is in contact with the pin member 84. Asperities are formed.
- the pin member 84 does not contact the contactable portion 60 of the main body portion 55 of the cap member 28, the contactable portion 60 is not formed with irregularities. Therefore, the contactable portion 60 has a planar shape.
- a drive source 86 configured by a motor or the like may be connected to the cap member 28, and the cap member 28 may be rotated by the drive source 86.
- the drive source 86 may be used alone or in combination with the drive unit 34 that rotates the pressure roller 22.
- the step S is formed so that the inner portion 61 is positioned on the outer diameter side with respect to the outer portion 62 has been described.
- the step S may be formed such that the outer portion 62 is positioned on the outer diameter side with respect to the inner portion 61.
- each elastic member 29 is formed of silicon sponge.
- each elastic member 29 may be formed of a material other than a silicon sponge such as a fluorine-based sponge, a fluorine-based rubber, or urethane.
- the case where the IH coil 40 is used as a heat source has been described.
- a heater such as a halogen heater or a ceramic heater may be used as a heat source.
- the configuration of the present invention is applied to the fixing device 19 of the type in which the fixing belt 21 is slid with respect to the pressing pad 25 .
- one or a plurality of rollers are used.
- the configuration of the present invention may be applied to a fixing device in which the fixing belt 21 is provided around.
- the present invention is applied to the color printer 1 in this embodiment.
- the present invention is applied to other image forming apparatuses such as a monochrome printer, a copier, a facsimile machine, and a multifunction machine.
- a configuration may be applied.
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Abstract
Description
Claims (12)
- 回転軸の周りを回転する定着ベルトと、
前記定着ベルトに圧接して定着ニップを形成する加圧部材と、
前記定着ベルトの端部に装着されるキャップ部材と、
前記定着ベルトと前記キャップ部材の間に介装される弾性部材と、を備え、
前記キャップ部材は、
前記定着ベルトの前記端部の前記回転軸方向外側を覆う本体部と、
前記本体部から前記回転軸方向内側に向かって延出し、前記定着ベルトの前記端部の外径側を覆うフランジ部と、を備え、
前記フランジ部の内周面には、段差が形成され、
前記弾性部材の外周面は、前記フランジ部の前記内周面のうちの前記段差よりも前記回転軸方向内側の部分に接触していることを特徴とする定着装置。 - 前記段差は、前記フランジ部の前記内周面のうちの前記段差よりも前記回転軸方向内側の部分が前記フランジ部の前記内周面のうちの前記段差よりも前記回転軸方向外側の部分よりも外径側に位置するように形成され、
前記弾性部材は、前記段差に沿って前記キャップ部材に取り付けられていることを特徴とする請求項1に記載の定着装置。 - 前記本体部の前記回転軸方向内側の面と、前記フランジ部の前記内周面のうちの前記段差よりも前記回転軸方向外側の部分と、前記弾性部材の前記回転軸方向外側の面と、によって囲まれる空間には、潤滑剤保持部が形成されていることを特徴とする請求項1に記載の定着装置。
- 前記弾性部材は、吸液性を有する材料によって形成されていることを特徴とする請求項1に記載の定着装置。
- 前記本体部の前記回転軸方向内側の面は、前記定着ベルトの前記端部と接触する可能性のある部分が平面状を成していることを特徴とする請求項1に記載の定着装置。
- 前記キャップ部材及び前記弾性部材は、前記定着ベルトと一体に回転することを特徴とする請求項1に記載の定着装置。
- 前記キャップ部材の回転を検知する回転検知機構を更に備えていることを特徴とする請求項6に記載の定着装置。
- 前記キャップ部材を回転させる駆動源を更に備えていることを特徴とする請求項6に記載の定着装置。
- 前記定着ベルトを前記加圧部材側に向かって押圧する押圧部材と、
前記押圧部材を支持する支持部材と、を更に備えていることを特徴とする請求項1に記載の定着装置。 - 前記定着ベルトの外周に沿って設けられ、前記定着ベルトを加熱する熱源を更に備えていることを特徴とする請求項1に記載の定着装置。
- 前記定着ベルトの内周面に沿って配置され、前記定着ベルトを内側からガイドするガイド部材を更に備えていることを特徴とする請求項1に記載の定着装置。
- 請求項1に記載の定着装置を備えていることを特徴とする画像形成装置。
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CN201580000251.2A CN105209979B (zh) | 2014-04-24 | 2015-02-16 | 定影装置及图像形成装置 |
US14/783,327 US9501009B2 (en) | 2014-04-24 | 2015-02-16 | Fixing device and image forming apparatus |
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JP2019158947A (ja) * | 2018-03-08 | 2019-09-19 | 京セラドキュメントソリューションズ株式会社 | 定着装置及び画像形成装置 |
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JP6050844B2 (ja) * | 2015-01-30 | 2016-12-21 | 京セラドキュメントソリューションズ株式会社 | 定着装置及び該定着装置を備えた画像形成装置 |
JP7110707B2 (ja) * | 2018-05-08 | 2022-08-02 | 京セラドキュメントソリューションズ株式会社 | 定着装置及び画像形成装置 |
JP7167645B2 (ja) * | 2018-11-09 | 2022-11-09 | 京セラドキュメントソリューションズ株式会社 | 定着装置及び画像形成装置 |
JP7292875B2 (ja) * | 2018-12-27 | 2023-06-19 | キヤノン株式会社 | 像加熱装置 |
JP2023080851A (ja) * | 2021-11-30 | 2023-06-09 | 株式会社リコー | 加熱装置、定着装置、画像形成装置 |
JP2023141232A (ja) * | 2022-03-23 | 2023-10-05 | 富士フイルムビジネスイノベーション株式会社 | 定着装置および画像形成装置 |
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