JP6185873B2 - Fixing apparatus and image forming apparatus - Google Patents

Fixing apparatus and image forming apparatus Download PDF

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Publication number
JP6185873B2
JP6185873B2 JP2014072990A JP2014072990A JP6185873B2 JP 6185873 B2 JP6185873 B2 JP 6185873B2 JP 2014072990 A JP2014072990 A JP 2014072990A JP 2014072990 A JP2014072990 A JP 2014072990A JP 6185873 B2 JP6185873 B2 JP 6185873B2
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fixing
fixing belt
downstream
guide
upstream
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JP2015194633A (en
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義弘 山岸
義弘 山岸
良治 金松
良治 金松
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京セラドキュメントソリューションズ株式会社
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Description

  The present invention relates to a fixing device that fixes a toner image on a recording medium, and an image forming apparatus including the fixing device.
  2. Description of the Related Art Conventionally, an electrophotographic image forming apparatus such as a copying machine, a printer, a fax machine, or a multifunction machine includes a fixing device that fixes a toner image on a recording medium such as paper. A heat roller system is widely used for this fixing device. The hot roller method is a method of forming a fixing nip using a pair of rollers.
  On the other hand, in order to reduce the heat capacity of the fixing device and shorten the warm-up time, the fixing method has been shifted from the heat roller method to the belt method. The belt method is a method of forming a fixing nip using a fixing belt.
  For example, in Patent Document 1, a fixing belt, a pressure member that presses against the fixing belt to form a fixing nip (see “Pressure Roller 22” in Patent Document 1), and a radially inner side of the fixing belt are arranged. A fixing device including a heat source (see “Halogen heater 23” in Patent Document 1), a reflecting member that reflects radiant heat from the heat source, and a nip forming member that presses the fixing belt toward the pressing member. It is disclosed.
JP 2013-145288 A
  In Patent Document 1, since the reflecting member and the nip forming member are formed separately, the total heat capacity of the members arranged on the radially inner side of the fixing belt is increased, and the temperature raising performance of the fixing belt may be reduced. is there.
  In addition, since the reflecting member and the nip forming member are formed separately as described above, it is difficult to efficiently transfer the heat of the reflecting member to the fixing nip through the nip forming member. There is a risk that the temperature tends to decrease.
  Further, in the fixing device described in Patent Document 1, if the fixing belt is deformed during rotation of the fixing belt, the fixing belt may be damaged by contact with other members, or the interval between the fixing belt and the temperature detection unit may be changed. As a result, the temperature of the fixing belt may not be detected accurately. Therefore, it is necessary to suppress the deformation of the fixing belt.
  In view of the above circumstances, an object of the present invention is to reduce the total heat capacity of members arranged radially inside the fixing belt and to suppress the deformation of the fixing belt and the decrease in the temperature of the fixing nip.
  The fixing device of the present invention is disposed on the radially inner side of the fixing belt, a fixing belt that is rotatably provided, a fixing nip that is in pressure contact with the fixing belt, and a pressure member that is rotatably provided, A heat source that radiates radiant heat, a reflective portion that reflects radiant heat radiated from the heat source toward an inner peripheral surface of the fixing belt, a pressing portion that presses the fixing belt toward the pressure member, and And a reflecting member integrally having a guide portion that contacts the inner peripheral surface of the fixing belt.
  As described above, the reflecting portion, the pressing portion, and the guide portion are provided on the reflecting member, so that the reflecting portion, the pressing portion, and the guide portion are provided on the radially inner side of the fixing belt as compared with the case where the reflecting portion, the pressing portion, and the guide portion are provided on different members. It becomes possible to reduce the total heat capacity of the arranged members. Along with this, it is possible to improve the temperature raising performance of the fixing belt.
  In addition, as described above, the guide portion comes into contact with the inner peripheral surface of the fixing belt, so that it is possible to suppress deformation of the fixing belt during rotation of the fixing belt and to stabilize the traveling of the fixing belt.
  In addition, as described above, the reflecting portion and the pressing portion are provided on the reflecting member, so that when the temperature of the reflecting portion rises, the heat of the reflecting portion can be efficiently transmitted to the fixing nip via the pressing portion. It becomes possible. Along with this, it is possible to suppress a decrease in the temperature of the fixing nip.
  The reflection portion is provided with a first inclined portion inclined toward the fixing nip side toward the upstream side in the conveyance direction of the recording medium, and downstream of the first inclined portion in the conveyance direction of the recording medium. A second inclined portion inclined toward the fixing nip side toward the downstream side in the direction.
  By adopting such a configuration, it is possible to reduce the area of the heat source that is covered by the reflecting portion. Along with this, it is possible to reduce the amount of radiant heat applied to the reflecting portion and increase the amount of radiant heat applied to the inner peripheral surface of the fixing belt. For this reason, it is possible to improve the temperature raising performance of the fixing belt.
  The reflection portion is provided with a first inclined portion inclined toward the fixing nip side toward the upstream side in the conveyance direction of the recording medium, and downstream of the first inclined portion in the conveyance direction of the recording medium. A second inclined portion that is inclined toward the fixing nip toward the upstream side in the direction.
  By adopting such a configuration, the radiant heat from the heat source can be reflected to the portion of the fixing belt before entering the fixing nip by the second inclined portion. Along with this, it is possible to efficiently heat the portion of the fixing belt before entering the fixing nip, and it is possible to more reliably suppress a decrease in the temperature of the fixing nip.
  The reflection part may be further provided along a conveyance direction of the recording medium, and further include a connection part that connects the first inclined part and the second inclined part.
  By adopting such a configuration, it becomes easy to increase the distance between the heat source and the reflecting portion, and thus it is possible to suppress the temperature rise of the reflecting member. Along with this, the life of the reflecting member can be extended.
  The guide portion may be formed on the upstream side of the fixing nip in the rotation direction of the fixing belt.
  By adopting such a configuration, it is possible to reliably suppress deformation of the fixing belt on the upstream side of the fixing nip in the rotation direction of the fixing belt.
  The guide portion may be formed on the downstream side of the fixing nip in the rotation direction of the fixing belt.
  By adopting such a configuration, it is possible to prevent the guide portion from blocking radiant heat from the heat source toward the inner peripheral surface of the fixing belt on the upstream side of the fixing nip in the rotation direction of the fixing belt. Along with this, it is possible to more reliably suppress a decrease in the temperature of the fixing nip.
  The guide portions may be respectively formed on the upstream side and the downstream side of the fixing nip in the rotation direction of the fixing belt.
  By adopting such a configuration, it is possible to reliably suppress deformation of the fixing belt and further stabilize the running of the fixing belt.
  The image forming apparatus of the present invention includes any one of the fixing devices described above.
  According to the present invention, it is possible to reduce the total heat capacity of the members disposed on the radially inner side of the fixing belt, and to suppress the deformation of the fixing belt and the decrease in the temperature of the fixing nip.
1 is a schematic diagram illustrating an outline of a 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. 3 is an exploded perspective view showing an upper frame portion and a fixing belt in the fixing device according to the embodiment of the present invention. 1 is a cross-sectional view showing a fixing belt and its peripheral portion in a fixing device according to an embodiment of the present invention. FIG. 7 is a cross-sectional view showing a fixing belt and its periphery in a fixing device according to another embodiment of the present invention. FIG. 7 is a cross-sectional view showing a fixing belt and its periphery in a fixing device according to another embodiment of the present invention. FIG. 7 is a cross-sectional view showing a fixing belt and its periphery in a fixing device according to another embodiment of the present invention.
  First, the overall configuration of the printer 1 (image forming apparatus) will be described with reference to FIG.
  The printer 1 includes a box-shaped printer main body 2, and a paper feed cassette 3 that stores paper (recording medium) is stored in a lower portion of the printer main body 2. 4 is provided. An upper cover 5 is attached to the upper surface of the printer main body 2 so as to be openable and closable on the side of the paper discharge tray 4, and a toner container 6 is accommodated below the upper cover 5.
  An exposure unit 7 composed of a laser scanning unit (LSU) is disposed below the paper discharge tray 4 above the printer body 2, and an image forming unit 8 is provided below the exposure unit 7. Yes. The image forming unit 8 is rotatably provided with a photosensitive drum 10 as an image carrier. Around the photosensitive drum 10, a charger 11, a developing device 12, a transfer roller 13, and a cleaning device are provided. The apparatus 14 is disposed along the rotation direction of the photosensitive drum 10 (see arrow X in FIG. 1).
  A paper transport path 15 is provided inside the printer main body 2. A paper feed unit 16 is provided at the upstream end of the conveyance path 15, and a transfer unit 17 configured by the photosensitive drum 10 and the transfer roller 13 is provided at a middle portion of the conveyance path 15. Is provided with a fixing device 18, and a paper discharge unit 19 is provided at the downstream end of the conveyance path 15. A reverse path 20 for double-sided printing is formed below the transport path 15.
  Next, an image forming operation of the printer 1 having such a configuration will be described.
  When the printer 1 is turned on, various parameters are initialized, and initial setting such as temperature setting of the fixing device 18 is executed. When image data is input from a computer or the like connected to the printer 1 and an instruction to start printing is given, an image forming operation is executed as follows.
  First, after the surface of the photosensitive drum 10 is charged by the charger 11, exposure corresponding to the image data is performed on the photosensitive drum 10 by laser light from the exposure device 7 (see the two-dot chain line P in FIG. 1). The electrostatic latent image is formed on the surface of the photosensitive drum 10. Next, the electrostatic latent image is developed by the developing device 12 into a toner image with toner.
  On the other hand, the sheet taken out from the sheet cassette 3 by the sheet feeding unit 16 is conveyed to the transfer unit 17 in synchronization with the above-described image forming operation, and the toner image on the photosensitive drum 10 is transferred to the sheet by the transfer unit 17. Is transcribed. The sheet on which the toner image has been transferred is conveyed downstream in the conveyance path 15 and enters the fixing device 18 where the toner image is fixed on the sheet. The paper on which the toner image is fixed is discharged from the paper discharge unit 19 to the paper discharge tray 4. The toner remaining on the photosensitive drum 10 is collected by the cleaning device 14.
  Next, the fixing device 18 will be described in detail. Hereinafter, for convenience of explanation, the front side of the sheet in FIG. 2 is defined as the front side (front side) of the fixing device 18. An arrow Y in FIG. 2 indicates the sheet conveyance direction (in this embodiment, the left-right direction). An arrow Fr attached to FIGS. 3 and 4 indicates the front side (front side) of the fixing device 18. The arrow I attached | subjected to FIG. 4 has shown the front-back direction inner side, and the arrow O attached | subjected to FIG. 4 has shown the front-back direction outer side.
  As shown in FIG. 2 and the like, the fixing device 18 includes a box-shaped fixing frame 21, a fixing belt 22 accommodated in the upper part of the fixing frame 21, and a pressure roller 23 accommodated in the lower part of the fixing frame 21. (Pressure member), a heater 24 (heat source) disposed radially inside the fixing belt 22, a reflecting member 25 disposed below the heater 24 on the radially inner side of the fixing belt 22, and the fixing belt 22 And a support member 26 disposed so as to be covered with the reflecting member 25 on the inner side in the radial direction.
  The fixing frame 21 is formed of sheet metal. As shown in FIG. 3 and the like, the fixing frame 21 includes an upper frame portion 31 and a lower frame portion 32 that are connected to each other.
  The upper frame portion 31 of the fixing frame 21 includes a pair of front and rear upper end plates 33 and a top plate 34 that connects the upper end portions of the upper end plates 33.
  As shown in FIG. 4 and the like, a heater mounting plate 35 is fixed to the outer surface of each upper end plate 33 of the upper frame portion 31. A belt mount 36 is fixed to the inner surface of each upper end plate 33. An arcuate belt support portion 37 is provided at the end of each belt mount 36 on the inner side in the front-rear direction. An annular meandering control ring 38 is provided on the outer periphery of the belt support portion 37.
  A pair of front and rear first thermistors 40 are fixed to the top plate 34 of the upper frame portion 31. As shown in FIG. 3 and the like, each first thermistor 40 is in contact with the central portion and the rear portion of the outer peripheral surface of the fixing belt 22.
  The lower frame portion 32 of the fixing frame 21 includes a pair of front and lower lower end plates 41 and a bottom plate 42 that connects lower portions of the lower end plates 41.
  A swing frame 43 is provided inside each lower side end plate 41 of the lower frame portion 32 in the front-rear direction. A support shaft 44 is provided on the right end side of each swing frame 43, and each swing frame 43 swings around each support shaft 44 as a fulcrum. An input gear 45 is provided coaxially with each support shaft 44 on the rear side (front-rear direction outer side) of the lower lower end plates 41 on the rear side. The input gear 45 is connected to a drive source 46 configured by a motor or the like.
  As shown in FIG. 2 and the like, a second thermistor 47 is fixed to the lower frame portion 32. The second thermistor 47 is in contact with the outer peripheral surface of the pressure roller 23. The lower frame portion 32 is provided with an entry guide 48 and a discharge guide 49.
  The fixing belt 22 has a substantially cylindrical shape that is long in the front-rear direction. The fixing belt 22 has flexibility and is endless in the circumferential direction. The fixing belt 22 has a diameter of 30 mm, for example.
  The fixing belt 22 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 22 is formed of a metal such as SUS having a thickness of 30 μm, for example. The base material layer of the fixing belt 22 may be formed of a resin such as PI (polyimide). The elastic layer of the fixing belt 22 is made of, for example, silicon rubber having a thickness of 270 μm. The release layer of the fixing belt 22 is formed of, for example, a PFA tube having a thickness of 30 μm. In each figure, each layer (base material layer, elastic layer, release layer) of the fixing belt 22 is displayed without being particularly distinguished. A black coating for increasing the heat absorption rate is applied to the inner peripheral surface of the fixing belt 22.
  At both front and rear ends of the fixing belt 22, belt support portions 37 (see FIG. 4 and the like) provided on each belt mounting base 36 of the upper frame portion 31 are inserted. As a result, the fixing belt 22 is rotatably supported by the upper frame portion 31. The fixing belt 22 is rotatable around a rotation axis A (see FIG. 4) 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 22. Both front and rear end faces of the fixing belt 22 are disposed on the inner side in the front-rear direction of a meandering restriction ring 38 provided on each belt mount 36 of the upper frame portion 31. As a result, the meandering (moving outward in the front-rear direction) of the fixing belt 22 is restricted.
  The pressure roller 23 (see FIG. 2 and the like) has a substantially cylindrical shape that is long in the front-rear direction. The pressure roller 23 has a diameter of 25 mm, for example.
  The pressure roller 23 includes, for example, a cylindrical core member 50, an elastic layer 51 provided around the core member 50, and a release layer (not shown) that covers the elastic layer 51. ing. The core member 50 of the pressure roller 23 is formed of a metal such as iron having a diameter of 18 mm, for example. The elastic layer 51 of the pressure roller 23 is made of, for example, silicon rubber having a thickness of 3.5 mm. The release layer of the pressure roller 23 is formed by, for example, a PFA tube.
  The pressure roller 23 is disposed on the lower side (outside) of the fixing belt 22. The pressure roller 23 is in pressure contact with the fixing belt 22, and a fixing nip 52 is formed between the fixing belt 22 and the pressure roller 23. The pressure roller 23 is rotatably supported at the longitudinal center of the swing frame 43 of the fixing frame 21 (in this embodiment, the center in the left-right direction). The swing frame 43 swings around the support shaft 44. By moving, the pressure roller 23 moves up and down, and the pressure of the fixing nip 52 is switched.
  As shown in FIG. 3, a drive gear 53 is fixed to the rear end portion of the pressure roller 23. The drive gear 53 meshes with the input gear 45 and is connected to the drive source 46 via the input gear 45.
  The heater 24 (see FIG. 5 and the like) is composed of, for example, a halogen heater. The heater 24 is disposed in an upper region R1 (region on the side away from the fixing nip 52) in the space S on the radially inner side of the fixing belt 22. Both front and rear end portions of the heater 24 are attached to a heater mounting plate 35 (see FIG. 4 and the like) of the upper frame portion 31 of the fixing frame 21. The heater 24 generates heat when energized and radiates radiant heat.
  The reflection member 25 (see FIG. 5 and the like) has a long shape in the front-rear direction. The reflecting member 25 has a left-right asymmetric shape with a vertical line L passing through the center Z of the heater 24 as the center. The reflecting member 25 is made of a metal such as bright aluminum, for example. The reflecting member 25 is formed by bending a single sheet metal.
  The reflecting member 25 includes a reflecting portion 56, a pressing portion 57 disposed below the reflecting portion 56, an upstream guide portion 58 (guide portion) disposed on the lower right side of the reflecting portion 56, and the reflecting portion 56. And a downstream guide portion 59 (guide portion) disposed on the left side of the same. That is, the reflecting portion 56, the pressing portion 57, and the guide portions 58 and 59 are integrally formed.
  The upper surface (surface on the heater 24 side) of the reflection portion 56 is a reflection surface (mirror surface) that reflects the radiant heat radiated from the heater 24 toward the inner peripheral surface of the fixing belt 22. The reflection part 56 is arrange | positioned so that the upper side (heater 24 side) of the supporting member 26 may be covered. The reflection portion 56 is provided so as to partition the heater 24 and the support member 26.
  The reflecting portion 56 includes a first inclined portion 61, a second inclined portion 62 provided on the left side of the first inclined portion 61 (downstream in the paper transport direction), the first inclined portion 61, and the second inclined portion 62. A connecting portion 63 to be connected.
  The first inclined portion 61 is inclined downward (fixing nip 52 side) toward the right side (upstream side in the sheet conveyance direction). The second inclined portion 62 is inclined downward (fixing nip 52 side) toward the left side (downstream side in the sheet conveyance direction). The connection part 63 is provided along the left-right direction (paper conveyance direction). The connecting portion 63 is opposed to the heater 24 with an interval.
  The reflection part 56 is bent so as to be convex toward the upper side (the heater 24 side). In other words, the reflection part 56 is bent so as to be concave toward the lower side (the support member 26 side). Therefore, a recess 66 is formed on the lower side of the reflection portion 56 (on the support member 26 side) so as to be surrounded by the first inclined portion 61, the second inclined portion 62, and the connecting portion 63.
  The lower surface of the pressing portion 57 presses the fixing belt 22 downward (pressure roller 23 side). A sheet member 90 is interposed between the lower surface of the pressing portion 57 and the inner peripheral surface of the fixing belt 22. The sheet member 90 is formed of, for example, a fluorine-based resin such as PTFE, and has a lower friction coefficient than the pressing portion 57. A lubricant (grease) may be applied between the lower surface of the pressing portion 57 and the inner peripheral surface of the fixing belt 22.
  The upstream guide portion 58 is in contact with the inner peripheral surface of the fixing belt 22. The upstream guide portion 58 is formed on the upstream side of the fixing nip 52 in the rotation direction of the fixing belt 22 (see arrow C in FIG. 5). The upstream guide part 58 connects the first inclined part 61 of the reflecting part 56 and the pressing part 57. The upstream guide portion 58 is bent toward the downstream side in the rotation direction of the fixing belt 22 from the right end portion (the upstream end portion in the sheet conveyance direction) of the first inclined portion 61 of the reflection portion 56. The upstream guide portion 58 is curved in an arc shape along the rotation direction of the fixing belt 22. The upstream guide portion 58 is provided continuously with the pressing portion 57.
  The downstream guide portion 59 is in contact with the inner peripheral surface of the fixing belt 22. The downstream guide portion 59 is formed on the downstream side of the fixing nip 52 in the rotation direction of the fixing belt 22 (see arrow C in FIG. 5). The downstream guide portion 59 is bent from the left end portion (the end portion on the downstream side in the sheet transport direction) of the second inclined portion 62 of the reflection portion 56 toward the downstream side in the rotation direction of the fixing belt 22. The downstream guide portion 59 is curved in an arc shape along the rotation direction of the fixing belt 22. The downstream guide part 59 is provided via a gap with the pressing part 57.
  The support member 26 has a shape that is long in the front-rear direction. The upper portion of the support member 26 is inserted into a recess 66 formed on the lower side of the reflection portion 56 of the reflection member 25. The support member 26 includes an upstream stay 71 and a downstream stay 72. The upstream stay 71 and the downstream stay 72 are formed of sheet metal such as SECC (galvanized steel sheet) having a thickness of 2.0 mm, for example.
  The upstream stay 71 includes an upstream base plate 73 extending in the vertical direction, an upstream support plate 74 bent from the lower end of the upstream base plate 73 toward the right side (upstream side in the sheet conveyance direction), and the upstream side. And an upstream guide plate 75 bent from the right end portion of the support plate 74 toward the upper right side.
  The downstream stay 72 includes a downstream base plate 80 extending in the vertical direction, a downstream support plate 81 bent from the lower end of the downstream base plate 80 toward the left side (downstream in the sheet transport direction), and the downstream side. And a downstream guide plate 82 that is bent from the left end portion of the support plate 81 toward the upper left side. The downstream base plate 80 is fixed to the upstream base plate 73 by screws 84.
  The lower surface of the support member 26 (specifically, the lower surface of the upstream support plate 74 of the upstream stay 71 and the lower surface of the downstream support plate 81 of the downstream stay 72) is in contact with the upper surface of the pressing portion 57 of the reflecting member 25. Yes. Accordingly, the pressing portion 57 is supported by the support member 26, and warping (deformation due to the fixing load) of the pressing portion 57 is suppressed.
  In the fixing device 18 configured as described above, when the toner image is fixed on the paper, the drive source 46 is driven. When the drive source 46 is driven in this way, the rotation of the drive source 46 is transmitted to the pressure roller 23 via the input gear 45 and the drive gear 53, and the pressure roller 23 is moved as shown by an arrow B in FIG. Rotate. When the pressure roller 23 rotates in this way, as indicated by an arrow C in FIG. 2, the fixing belt 22 that is in pressure contact with the pressure roller 23 is driven to rotate in the direction opposite to the pressure roller 23. When the fixing belt 22 rotates as described above, the fixing belt 22 slides with respect to the pressing portion 57 of the reflecting member 25 and the sheet member 90.
  Further, when fixing the toner image on the paper, the heater 24 is operated (lighted). When the heater 24 is operated in this way, radiant heat is radiated from the heater 24. A part of the radiant heat radiated from the heater 24 is directly irradiated onto and absorbed by the inner peripheral surface of the fixing belt 22 as indicated by an arrow D in FIG. Further, another part of the radiant heat radiated from the heater 24 is reflected toward the inner peripheral surface of the fixing belt 22 by the reflecting portion 56 of the reflecting member 25 as shown by an arrow E in FIG. 22 is absorbed by the inner peripheral surface. Due to the above operation, the fixing belt 22 is heated by the heater 24. When the paper passes through the fixing nip 52 in this state, the toner image is heated and melted, and the toner image is fixed on the paper.
  In the present embodiment, as described above, the reflecting portion 56, the pressing portion 57, and the guide portions 58 and 59 are provided on the reflecting member 25. Therefore, the total heat capacity of the members disposed on the radially inner side of the fixing belt 22 can be reduced as compared with the case where the reflecting portion 56, the pressing portion 57, and the guide portions 58 and 59 are provided on different members. It becomes possible. Along with this, the temperature rise performance of the fixing belt 22 can be improved.
  Further, as described above, since the guide portions 58 and 59 are in contact with the inner peripheral surface of the fixing belt 22, deformation of the fixing belt 22 during rotation of the fixing belt 22 is suppressed, and the running of the fixing belt 22 is stabilized. It becomes possible to make it. In the present embodiment, in particular, the guide portions 58 and 59 are formed on the upstream side and the downstream side of the fixing nip 52 in the rotation direction of the fixing belt 22, respectively. It is possible to further stabilize the running.
  Further, since the reflecting portion 56 and the pressing portion 57 are provided on the reflecting member 25 as described above, when the temperature of the reflecting portion 56 rises, the heat of the reflecting portion 56 is transferred via the pressing portion 57 to the fixing nip 52. It is possible to efficiently transmit to the network. Accordingly, it is possible to suppress a decrease in the temperature of the fixing nip 52. In addition, the heat of the reflecting portion 56 can be transmitted to the fixing belt 22 in portions other than the portion corresponding to the fixing nip 52 via the guide portions 58 and 59, and the temperature raising performance of the fixing belt 22 is improved. It becomes possible.
  Further, the reflecting portion 56 is inclined to the lower side (fixing nip 52 side) toward the right side (upstream side in the sheet conveyance direction), and to the left side of the first inclined portion 61 (in the sheet conveyance direction). And a second inclined portion 62 which is provided on the downstream side and is inclined downward (fixing nip 52 side) toward the left side (downstream side in the sheet conveyance direction). By adopting such a configuration, it is possible to reduce the area of the heater 24 that is covered by the reflecting portion 56. Accordingly, it is possible to reduce the amount of radiant heat applied to the reflection portion 56 and increase the amount of radiant heat applied to the inner peripheral surface of the fixing belt 22. As a result, the temperature rise performance of the fixing belt 22 can be improved.
  The reflection unit 56 further includes a connecting portion 63 that is provided along the left-right direction (paper transport direction) and connects the first inclined portion 61 and the second inclined portion 62. By adopting such a configuration, it becomes easy to increase the distance between the heater 24 and the reflection portion 56, so that the temperature rise of the reflection member 25 can be suppressed. Accordingly, the life of the reflecting member 25 can be extended.
  Further, the upstream guide portion 58 is formed on the upstream side of the fixing nip 52 in the rotation direction of the fixing belt 22. By adopting such a configuration, it is possible to reliably suppress deformation of the fixing belt 22 on the upstream side of the fixing nip 52 in the rotation direction of the fixing belt 22.
  Further, the downstream guide portion 59 is formed on the downstream side of the fixing nip 52 in the rotation direction of the fixing belt 22. By adopting such a configuration, radiant heat from the heater 24 toward the inner peripheral surface of the fixing belt 22 on the upstream side of the fixing nip 52 in the rotation direction of the fixing belt 22 is prevented from being blocked by the downstream guide portion 59. It becomes possible. Along with this, it is possible to more reliably suppress a decrease in the temperature of the fixing nip 52.
  Further, as shown in FIG. 5 and the like, the heater 24 is arranged in the upper region R1 (region on the side away from the fixing nip 52) in the space S on the radial inner side of the fixing belt 22. By adopting such a configuration, the heater 24 is arranged in the right region R2 (region upstream in the paper transport direction) and the left region R3 (region downstream in the paper transport direction) in the space S. Compared to the case, the distance between the support member 26 and the heater 24 arranged around the fixing nip 52 can be increased. Along with this, it is possible to suppress the temperature rise of the support member 26.
  Further, the reflection portion 56 of the reflection member 25 is provided so as to partition the heater 24 and the support member 26. By adopting such a configuration, it is possible to prevent the support member 26 from being directly irradiated with radiant heat from the heater 24. Along with this, the heat taken by the support member 26 can be reduced, the temperature raising performance of the fixing belt 22 can be improved, and the energy saving performance of the fixing device 18 can be improved.
  In the present embodiment, the case where the guide portions 58 and 59 are respectively formed on the upstream side and the downstream side of the fixing nip 52 in the rotation direction of the fixing belt 22 has been described. On the other hand, in other different embodiments, as shown in FIGS. 6 and 7, a guide portion may be formed only on the upstream side of the fixing nip 52 in the rotation direction of the fixing belt 22. Although not particularly illustrated, a guide portion may be formed only on the downstream side of the fixing nip 52 in the rotation direction of the fixing belt 22.
  In the present embodiment, the downstream guide portion 59 is bent from the left end portion (end portion on the downstream side in the sheet transport direction) of the second inclined portion 62 of the reflection portion 56 toward the downstream side in the rotation direction of the fixing belt 22. Explained. On the other hand, in another different embodiment, the downstream guide portion 59 may be bent from the left end portion of the second inclined portion 62 of the reflection portion 56 toward the upstream side in the rotation direction of the fixing belt 22.
  In the present embodiment, the case where the second inclined portion 62 of the reflecting portion 56 is inclined downward (fixing nip 52 side) toward the left side (downstream side in the sheet conveyance direction) has been described. On the other hand, in another different embodiment, as shown in FIG. 7, the second inclined portion 62 of the reflecting portion 56 is inclined downward (fixing nip 52 side) toward the right side (upstream side in the sheet conveyance direction). You may do it. By adopting such a configuration, as indicated by an arrow F in FIG. 7, the second inclined portion 62 reflects the radiant heat from the heater 24 to the right side portion of the fixing belt 22 (the portion before entering the fixing nip 52). Can be made. As a result, the right side portion of the fixing belt 22 can be efficiently heated, and the temperature decrease of the fixing nip 52 can be more reliably suppressed.
  Further, as described above, when the second inclined portion 62 of the reflecting portion 56 is inclined downward (fixing nip 52 side) toward the right side (upstream side in the sheet conveyance direction), as shown in FIG. The guide portion 58 may be formed only on the upstream side of the fixing nip 52 in the rotation direction of the belt 22, or as shown in FIG. 8, the upstream side and the downstream side of the fixing nip 52 in the rotation direction of the fixing belt 22. The guide portions 58 and 59 may be formed respectively. In FIG. 8, the downstream guide portion 59 is bent from the left end portion of the second inclined portion 62 of the reflection portion 56 toward the upstream side in the rotation direction of the fixing belt 22, but in other different embodiments, The downstream guide portion 59 may be bent from the left end portion of the second inclined portion 62 of the reflecting portion 56 toward the downstream side in the rotation direction of the fixing belt 22.
  In the present embodiment, the case where one heater 24 is arranged on the inner side in the radial direction of the fixing belt 22 has been described. On the other hand, in other different embodiments, a plurality of heaters 24 may be arranged inside the fixing belt 22 in the radial direction.
  In the present embodiment, the case where a halogen heater is used as the heater 24 has been described. However, in another different embodiment, a ceramic heater or the like may be used as the heater 24.
  In this embodiment, the case where the configuration of the present invention is applied to the printer 1 has been described. However, in another different embodiment, the configuration of the present invention is applied to other image forming apparatuses such as a copying machine, a facsimile machine, and a multifunction machine. It is also possible.
1 Printer (image forming device)
18 Fixing Device 22 Fixing Belt 23 Pressure Roller (Pressure Member)
24 Heater (heat source)
25 Reflecting member 52 Fixing nip 56 Reflecting portion 57 Pressing portion 58 Upstream guide portion (guide portion)
59 Downstream guide part (guide part)
61 1st inclination part 62 2nd inclination part 63 connection part

Claims (5)

  1. A fixing belt provided rotatably;
    A pressure member provided in a rotatable manner to form a fixing nip by pressing against the fixing belt;
    A heat source that is disposed radially inside the fixing belt and emits radiant heat;
    A reflection portion that reflects radiant heat radiated from the heat source toward the inner peripheral surface of the fixing belt, a pressing portion that presses the fixing belt toward the pressure member, and an inner peripheral surface of the fixing belt. A reflective member integrally having a guide portion that comes into contact ,
    The reflection portion, the pressing portion, and the guide portion are integrally formed by a single sheet metal,
    The guide portion is
    An upstream guide portion that is formed on the upstream side of the fixing nip in the rotation direction of the fixing belt, bends from the reflection portion toward the downstream side in the rotation direction of the fixing belt, and connects the reflection portion and the pressing portion. When,
    A downstream guide portion that is formed on the downstream side of the fixing nip in the rotation direction of the fixing belt, bends from the reflection portion toward the downstream side in the rotation direction of the fixing belt, and is provided via the pressing portion and a gap. And a fixing device.
  2. The reflective portion is
    A first inclined portion that is inclined toward the fixing nip side toward the upstream side in the conveyance direction of the recording medium;
    A second inclined portion provided on the downstream side of the first inclined portion in the conveyance direction of the recording medium and inclined toward the fixing nip side toward the downstream side of the recording medium in the conveyance direction. The fixing device according to claim 1.
  3. The reflective portion is
    The fixing device according to claim 2 , further comprising a connecting portion that is provided along a conveyance direction of the recording medium and connects the first inclined portion and the second inclined portion.
  4.   The fixing device according to claim 1, further comprising a support member that is disposed on a radially inner side of the fixing belt and supports the pressing portion.
  5. An image forming apparatus characterized in that it comprises a fixing device according to any one of claims 1-4.
JP2014072990A 2014-03-31 2014-03-31 Fixing apparatus and image forming apparatus Active JP6185873B2 (en)

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JP2002214953A (en) * 2001-01-23 2002-07-31 Matsushita Electric Ind Co Ltd Fixing device
JP2008292551A (en) * 2007-05-22 2008-12-04 Kyocera Mita Corp Fixing device
JP2010026058A (en) * 2008-07-16 2010-02-04 Panasonic Corp Fixing device
KR101460137B1 (en) * 2008-12-24 2014-11-10 삼성전자 주식회사 Fusing device and image forming apparatus having the same
JP2011022430A (en) * 2009-07-17 2011-02-03 Kyocera Mita Corp Fixing device and image forming apparatus
JP6026187B2 (en) * 2012-09-07 2016-11-16 株式会社沖データ Fixing apparatus and image forming apparatus

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