JP5472810B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP5472810B2
JP5472810B2 JP2010060000A JP2010060000A JP5472810B2 JP 5472810 B2 JP5472810 B2 JP 5472810B2 JP 2010060000 A JP2010060000 A JP 2010060000A JP 2010060000 A JP2010060000 A JP 2010060000A JP 5472810 B2 JP5472810 B2 JP 5472810B2
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sheet
fixing
opening
roller
rollers
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JP2011191706A (en
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創 太田
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株式会社リコー
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Description

  The present invention relates to an image forming apparatus that cools a sheet after being fixed by a copying machine, a facsimile, a printer, or the like.

  Recent image forming apparatuses such as copiers, facsimiles, and printers have been increased in speed and functionality, and it is possible to connect a post-processing peripheral device to perform various processes such as punching, stapling, and paper folding. Yes. With the spread of image forming apparatuses, there is an increasing demand for finishing of printed materials by users.

  In an image forming apparatus that fixes an image on a sheet by heating and pressurizing a toner image with a fixing device, the sheet is heated particularly during conveyance of the sheet after being fixed. Therefore, if the contact pressure of the heated paper to the guide plate or the like is high, there is a concern that toner adheres to the guide surface and abnormal images such as white stripes and scratches due to the toner adhering to the guide surface occur. Also, there are problems with the temperature rise inside the machine due to the heated paper being transported inside the machine, condensation on the transport path such as the guide plate, transport failure due to toner re-adhesion, and abnormal images such as water droplet images and missing transfer. Sometimes it becomes.

  2. Description of the Related Art Conventionally, a configuration in which a sheet is cooled by removing heat from the sheet heated by fixing using a heat pipe or the like is known. However, when cooling paper with a heat pipe, if the toner temperature on the paper is still high and the paper with the toner image fixed contacts the heat pipe, the toner adheres to the surface of the cold heat pipe. In some cases, a phenomenon called offset (hereinafter referred to as offset) occurs and a good image cannot be obtained.

  Therefore, in Japanese Patent Laid-Open No. 2004-228867, after fixing, the paper after fixing is cooled by blowing air with a fan on the transport path after fixing before cooling by taking heat from the paper heated by fixing using a heat pipe. A configuration in consideration of cooling and airflow design is disclosed. By adopting such a configuration, it is possible to prevent an offset that causes toner to adhere to the surface of the heat pipe.

  However, paper cooling using a heat pipe not only has many disadvantages in terms of cost due to the complexity of the component structure, but the general-purpose machines installed in general offices have a small machine size, so it is layout-like. There was also a problem that it was difficult to arrange. In addition, when air is cooled by blowing air to the paper in the transport path immediately after fixing, the part connecting the fixing device and the downstream transport path is wide open to secure the paper transport path. In addition to cooling, there is a problem that the blown air flows into the fixing unit and the temperature of the fixing roller pair itself of the fixing unit is lowered.

  Regarding the inflow of the air blown for air cooling into the fixing unit, in Japanese Patent Laid-Open No. 2004-228688, the image is provided with a control unit that performs cooling of the paper by the fan only when the paper is passed and stops the operation of the fan when the paper is not passed. A forming apparatus is disclosed. However, as described above, it is inevitable that the temperature of the fixing roller pair of the fixing unit itself decreases due to the wind inflow to the fixing when the paper is passed.

  Further, in Patent Document 3, a shutter is provided at the opening of the fixing unit so that the opening / closing position and the size thereof can be controlled according to the paper size so that the paper is not opened more than necessary even during paper feeding. Is disclosed. However, it is inevitable that the temperature of the fixing roller pair of the fixing unit itself decreases due to the inflow of wind into the fixing during paper feeding.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent a problem that occurs when the sheet heated in the fixing unit is conveyed in the conveyance path after the fixing while the sheet is heated by air-cooling the sheet. And providing an image forming apparatus capable of preventing a decrease in fixing temperature due to air-cooled wind inflow immediately after fixing.

In order to achieve the above object, the invention described in claim 1 is a transfer unit that transfers a toner image onto a sheet conveyed from a sheet stacking unit, and a toner image transferred onto the sheet is heated and pressurized to be fixed on the sheet. a fixing unit which is formed from a pair of conveying rollers for conveying the sheet on which the toner images are fixed to the discharge unit and the conveyance guide plate, and a conveyance portion of the fixing unit is a conveying path located downstream, and a fixing portion each portion connecting the transport path of the upstream and downstream provided with openings, and an exterior member covering the fixing unit, an image forming apparatus for chromatic and through roller pair, the nipping of the above paper full width provided at the outlet of the fixing unit , wherein each of a portion of the peripheral surface at the two through rollers through roller pair protrudes out of the outer member from the opening of the outlet side of the exterior member, an outlet side, which is formed in a rectangular shape in the outer member Before Of the four opening inner walls surrounding the opening, one of the two long side inner walls, which are the opening inner walls extending in the longitudinal direction of the opening along the roller axis direction, is applied to one peripheral surface of the two through rollers. The gap between the one long side inner wall and the one passing roller is closed, and the other circumferential surface of the two passing rollers is brought into contact with the other of the two long side inner walls, and the other long A concave curved surface that closes a gap between the inner side wall and the other through roller and contacts the convex curved surface that protrudes from the opening on the outlet side of the two through rollers, and is integral with or separate from the exterior member. Two concave inner surfaces of the concave curved member formed are brought into contact with one end of the convex curved surface in the roller axial direction, and two of the four inner walls of the opening are the inner walls of the opening that extend in the shorter direction of the opening. A gap between one of the inner side walls and one end of the two through rollers in the roller axial direction is closed, and the concave curved surface of the concave curved member different from the concave curved member is used as the other end of the convex curved surface in the roller axial direction. The gap between the other inner side wall of the two short sides and the other end of the two through rollers in the roller axial direction is closed .
According to a second aspect of the present invention, there is provided a transfer unit that transfers a toner image onto a sheet conveyed from a sheet stacking unit, a fixing unit that heats and pressurizes the toner image transferred onto the sheet, and fixes the toner image on the sheet, and a toner image is formed from a pair of conveying rollers for conveying the image-fixed sheet to the discharge unit and the conveyance guide plate, and a conveyance unit is carrying path located downstream of the fixing unit, a fixing unit to the transport path upstream and downstream in the image forming apparatus comprising respective openings at locations, and to chromatic and the package member covering the fixing unit, and through the roller pair nipping the above paper full width provided at the outlet of the fixing portion, the connecting of the threading rollers A part of each peripheral surface of the two threading rollers protrudes from the opening on the outlet side of the exterior member to the outside of the exterior member, and surrounds the opening on the outlet side formed in a rectangular shape in the exterior member. 4 Of the two inner rollers, the two inner rollers are in contact with one peripheral surface in a state of being fixed to one of the two long side inner walls that are the inner walls of the opening extending in the longitudinal direction of the opening along the roller axis direction. A shield member that closes a gap between the one long side inner wall and one of the through rollers, and the other long surface of the two long side inner walls in contact with the other circumferential surface of the two through rollers. A shielding member that closes a gap between the other inner wall of the other long side and the other through roller, and has concave curved surfaces that respectively contact the convex curved surfaces protruding from the opening on the outlet side of the two through rollers. In addition, the concave curved surface of the concave curved surface member formed integrally with or separately from the exterior member is brought into contact with one end portion of the convex curved surface in the roller axial direction, and the four inner walls of the opening are arranged in the short direction of the opening. A gap between one of the inner walls of the short side, which is the two inner walls of the opening, and one end in the roller axial direction of the two through rollers, and the concave curved surface of the concave curved member different from the concave curved member is used as the convex curved surface And the other end of the two short sides is closed and the gap between the other end of the two through rollers in the roller axial direction is closed .
According to a third aspect of the present invention, there is provided the image forming apparatus according to the first or second aspect, wherein the sheet is air-cooled between the through roller pair disposed at the fixing unit outlet and the conveying roller pair. It has a cooling means.
According to a fourth aspect of the present invention, in the image forming apparatus according to the third aspect, the sheet cooling means includes a duct for taking in outside air and a cooling fan, and blows outside air onto the sheet on which the toner image is fixed. Thus, the sheet is cooled.
According to a fifth aspect of the present invention, in the image forming apparatus according to the third or fourth aspect, the spray amount of the cooling fan onto the paper on which the toner image is fixed can be set in at least two stages. Is.
According to a sixth aspect of the present invention, in the image forming apparatus according to any one of the third to fifth aspects, the spraying amount of the cooling fan onto the paper on which the toner image is fixed depends on the type and size of the paper. It is characterized by being set.

  As described above, according to the present invention, it is possible to prevent wind from flowing in and out on the downstream side in the sheet conveyance direction of the exterior member covering the fixing unit regardless of whether or not the sheet is being passed. For this reason, the temperature of the fixing unit does not decrease due to the inflow and outflow of the wind on the downstream side in the sheet conveying direction of the exterior member covering the fixing unit while securing the sheet conveying path. In addition, since it is possible to prevent the fixing temperature of the fixing unit from being lowered, it is not necessary to supply more heat than necessary due to the reduction of the fixing temperature, and energy consumption can be saved. In addition, it is possible to perform desired sheet cooling without causing a decrease in temperature of the fixing unit on the downstream side in the sheet conveying direction of the fixing unit, and a problem due to the heated sheet being conveyed on the conveying path after fixing while being heated. It is also possible to prevent this.

1 is an overall schematic configuration diagram of an image forming apparatus according to an embodiment. FIG. 3 is an explanatory diagram of a configuration of a fixing unit according to the present embodiment, a cooling device disposed on the downstream side, and a conveyance path. FIG. 4 is an explanatory diagram illustrating a configuration of an opening provided on the downstream side of the sheet conveyance direction of the exterior member of the fixing unit according to the first exemplary embodiment and an exit roller pair. Explanatory drawing of the example at the time of providing the shielding member along the longitudinal direction of the exit opening part in the exit opening part vicinity of the exterior member which concerns on Example 2. FIG. FIG. 10 is an explanatory diagram illustrating a configuration of an opening provided on the downstream side of a sheet conveyance direction of an exterior member of a fixing unit according to a third embodiment and an exit roller pair. FIG. 3 is a conceptual diagram in which control of the image forming apparatus according to the present embodiment is divided for each function. FIG. 3 is an explanatory diagram of a display input unit of the image forming apparatus according to the present embodiment.

  Hereinafter, an embodiment in which the present invention is applied to a copying machine 100 as an image forming apparatus will be described with reference to FIGS. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

  FIG. 1 is an overall schematic configuration diagram of a copying machine 100 as an image forming apparatus according to an embodiment of the present invention. The copier 100 includes an apparatus main body 1 of the copier 100, a sheet bank 3 as a table-like sheet storage unit on which the apparatus main body 1 is placed, an image reading device 2 mounted on the apparatus main body 1, an image It is mainly composed of an automatic document feeder 4 which is mounted on the reading device 2 so as to be opened and closed.

  The apparatus main body 1 of the copying machine 100 is provided with a drum-shaped photoreceptor 10 as an image carrier. Around this photosensitive member 10, from the charging device 11 arranged on the left side in the figure, in the order of the rotation direction A in the counterclockwise direction in the figure, the developing device 12 on the lower side, the transfer device 13 on the right side, and the cleaning on the upper side. A device 14 is arranged. Further, the transfer device 13 is configured by a transfer belt 17 wound around between upper and lower rollers 15 and 16, and the transfer belt 17 is pressed against the peripheral surface of the photoconductor 10 at the transfer position B.

  A toner replenishing device 20 that replenishes the developing device 12 with new toner is provided on the left side of the charging device 11 and the cleaning device 14 in the drawing. Further, inside the apparatus main body 1 of the copying machine 100, there is provided a sheet conveying device C that feeds a sheet S such as a sheet or an OHP sheet from a supply position, which will be described later, and conveys the sheet S to a stack position via a transfer position B. The sheet conveying apparatus C has a supply path R1, a manual feed path R2, and a sheet conveyance path R, which will be described later. The sheet conveyance path R is provided in a substantially L shape that passes between the photosensitive member 10 and the transfer device 13 and extends from the bottom to the top in the drawing and then turns to the left. Further, a registration roller 21 is provided on the upstream side of the photoreceptor 10 in the sheet conveyance path R.

  A fixing device 22 is provided at a position downstream of the photoconductor 10. The fixing device 22 includes a pair of fixing rollers 24 a and 24 b that are rotating members of a fixing roller. A fixing heater 23 is provided inside one fixing roller 24a. Further, a pressure spring 25 (not shown), a pressure arm 26 (not shown) and the like are provided around the other fixing roller 24b. The other fixing roller 24b is pressed from the right side of the one fixing roller 24a in the figure by the pressure spring 25, the pressure arm 26, and the like. One fixing roller 24a is provided with a thermistor 28 (not shown) and a thermostat 29 (not shown). The fixing roller 24a is kept at a predetermined temperature by measuring the temperature of the fixing roller 24a with the thermistor 28 and turning on or off the fixing heater 23 with the thermostat 29.

  Further downstream of the fixing device 22, a discharge branch claw 34, a first pressure roller 36, a second pressure roller 37, a waist roller 38, and a discharge roller pair 35 that is a pair of conveyance rollers are provided. . Further, as shown in FIG. 1, a discharge stack portion 39 for discharging and stacking the image-formed sheet S is provided at the end.

  The image forming unit 1 of the copying machine 100 is provided with a switchback device 42 on the right side in the drawing. The switchback device 42 branches from the discharge branch claw 34 position of the sheet conveyance path R and leads to the switchback position 44 having a pair of switchback rollers 43, and the sheet conveyance path again from the switchback position 44. A sheet conveying device D having a re-conveying path R4 leading to the R registration rollers 21 is provided. The sheet transport apparatus D includes a sheet transport roller 66 that is a plurality of sheet transport rotating bodies that transport the sheet S.

  A laser writing device 47 is provided on the left side of the developing device 12 in the drawing. The laser writing device 47 includes a laser light source (not shown), a scanning rotary polygon mirror 48, a polygon motor 49, a scanning optical system 50 such as an fθ lens, and the like.

  The image reading device 2 is provided with a light source 53, a plurality of mirrors 54, an imaging optical lens 55, an image sensor 56 such as a CCD, and the like. A contact glass 57 is provided on the upper surface. The automatic document feeder 4 on the contact glass 57 is provided with a placement table (not shown) at the document placement position and a discharge table (not shown) at the discharge position. In addition, a sheet conveyance device having a document conveyance path (not shown) that conveys a sheet such as a document from a placement table to a discharge table through a reading position on the contact glass 57 of the image reading device 2 is provided. The sheet conveying apparatus is provided with a plurality of sheet conveying rollers that are sheet conveying rotating bodies (not shown) that convey a sheet such as a document.

  The sheet bank 3 includes a plurality of stages of sheet cassettes 61 that are the supply positions of the sheets S therein. Each sheet cassette 61 is provided with a call roller 62, a supply roller 63, and a separation roller 64 as corresponding feeding rollers. A supply path R1 leading to the sheet conveyance path R of the apparatus main body 1 of the copying machine 100 is formed on the right side of the multi-stage sheet cassette 61 in the drawing. The supply path R <b> 1 includes a sheet conveyance roller 66 that is a number of sheet conveyance rotation bodies that convey the sheet S.

  Further, the apparatus main body 1 of the copying machine 100 is provided with a manual feed unit 73 on the right side in the drawing. The manual feed unit 73 is provided with a manual feed tray 67 that can be manually opened and closed, and a manual feed path R2 that guides the manual sheet S set on the manual feed tray 67 to the sheet conveyance path R. I have. The manual feed tray 67 is also provided with a calling roller 62, a supply roller 63, and a separation roller 64 as feeding rollers, similarly to each sheet cassette 61.

  When making a copy using the copying machine 100, a main switch (not shown) is turned on and a document is set on the automatic document feeder 4. Alternatively, the automatic document feeder 4 is opened, a document is set directly on the contact glass 57 of the image reading device 2, and the automatic document feeder 4 is closed and pressed.

  When a start switch (not shown) is pressed, when the document is set on the automatic document feeder 4, the document is moved onto the contact glass 57 through the document conveyance path by the sheet conveyance roller, and then the image reading device 2 is moved. Drives, reads the contents of the document, and discharges it on the discharge table. On the other hand, when the document is set directly on the contact glass 57, the image reading apparatus 2 is immediately driven.

  When the image reading device 2 is driven, the image reading device 2 moves the light source 53 along the contact glass 57. Then, while moving, the light from the light source 53 is reflected by the document surface on the contact glass 57, the reflected light is reflected by a plurality of mirrors 54, passed through the imaging optical lens 55, and put into the image sensor 56, The image sensor 56 reads the document content.

  At the same time, the photoconductor 10 is rotated by a photoconductor drive motor (not shown), and in the illustrated example, the surface is uniformly charged by a charging device 11 using a charging roller. Next, laser light is irradiated according to the content of the original read by the image reading device 2 and writing is performed by the laser writing device 47 to form an electrostatic latent image on the surface of the photosensitive member 10, and then the developing device 12. The toner is attached to make the electrostatic latent image visible.

  At the same time when the start switch is pressed, the sheet S is sent out by the calling roller 62 from the corresponding sheet cassette 61 in the plurality of sheet cassettes 61 provided in multiple stages in the sheet bank 3, and subsequently the supply roller 63 and the separation roller 64. To separate and convey one sheet at a time. Then, the sheet S to be separated and conveyed is guided to the supply path R1, and further conveyed by the sheet conveyance roller 66 to the sheet conveyance path R, where it abuts against the registration roller 21 and stops. Then, the registration roller 21 is rotated in synchronization with the rotation of the image obtained by visualizing the photosensitive member 10 on the sheet S, and is fed to the right side of the photosensitive member 10.

  Alternatively, the manual sheet 67 of the manual sheet feeder 73 is opened, the manual sheet set on the manual tray 67 is sent out by the calling roller 62, and the sheet S is separated and conveyed one by one by the supply roller 63 and the separation roller 64. . Then, the sheet S to be separated and conveyed is guided to the manual feed path R2, and further conveyed by the sheet conveying roller 66 to the sheet conveying path R. The toner is fed to the right side of the photoconductor 10 in synchronization with the rotation.

  Then, an image on the photoconductor 10 is transferred to the sheet S fed to the right side of the photoconductor 10 at a transfer position B by a transfer device 13 having a transfer belt 17 in the illustrated example. Residual toner on the photoconductor 10 after image transfer is removed and cleaned by a cleaning device 14, and a residual potential on the photoconductor 10 is removed by a neutralization device (not shown) to prepare for the next image formation starting from the charging device 11. ing.

  On the other hand, the sheet S after the image transfer is conveyed by the transfer belt 17 and passes between the pair of fixing rollers 24 a and 24 b of the fixing device 22, and heat and pressure are applied, and the transferred image is fixed by the fixing device 22. Thereafter, the sheet S is seated by the discharge roller pair 35, the first pressure roller 36, the second pressure roller 37, and the waist roller 38, and is discharged onto the discharge stack portion 39 through the sheet discharge port 83. Stuck there.

  Further, when images are transferred to both sides of the sheet S, the discharge branch claw 34 is switched. The sheet with the image transferred on the front surface is put from the sheet transport path R to the reversing path R3, transported by the sheet transport roller 66, and put into the switchback position 44. Then, after switching back at the switchback position 44, the sheet is put into the re-conveying path R4, reversed, conveyed by the sheet conveying roller 66, and again guided to the sheet conveying path R, in the same manner as the transfer operation described above. The image is also transferred to the back surface of the sheet S.

  Next, the fixing device 22 and the configuration for cooling the sheet S fixed by the fixing device 22, which is a characteristic part of the present invention, will be described in detail with reference to examples.

Example 1
In the first embodiment, a fixing outlet roller pair 81 that is a pair of through rollers that nip the entire width or more of the sheet is provided at a fixing outlet (hereinafter referred to as an outlet opening) of an exterior member 80 that is a cover that covers the fixing device 22. . Then, the exit opening of the exterior member 80 and the fixing exit roller pair 81 provided in the exit opening are brought into contact with each other to close the gap between the exit opening and the fixing exit roller pair 81. Hereinafter, it demonstrates in detail using FIG. 2, FIG. 3 (a)-(c).

  FIG. 2 shows the fixing device 22, an exterior member 80 that is a cover that covers the fixing device 22, a fixing outlet roller pair 81 provided at the outlet opening thereof, and conveyance downstream of the fixing device 22 in the sheet conveyance path R. FIG. 6 is a schematic cross-sectional view showing an example of a sheet cooling unit 84 including a section, a cooling fan 85, and a duct 86. Here, in order to avoid complicated explanation, the inside of the fixing device 22 has a conveying guide plate 82, an exterior member 80, fixing rollers 24a and 24b as a fixing roller pair, and a full width or more of the paper disposed at the fixing outlet. Only the fixing exit roller pair 81 which is a pair of nipping through rollers is shown. Further, for the same reason, the conveyance unit on the downstream side of the fixing device 22 in the sheet conveyance path R has the sheet S in the discharge roller pair 35, the sheet discharge port 83, the discharge stack unit 39, and the sheet conveyance path R. Only the guide plates 71 and 72 that guide the conveyance are illustrated. FIG. 2 shows a cross section perpendicular to the longitudinal direction of the outlet opening, in a range through which the sheet S of the outlet opening passes.

  FIG. 3A is a perspective view of the end portion in the longitudinal direction of the outlet opening of the exterior member 80 that is a cover of the fixing device 22 as viewed from the outside. 3B is a cross-sectional view from the axial direction of the fixing outlet roller pair 81 when the longitudinal end of the outlet opening of the exterior member 80 is viewed from the direction of arrow F in FIG. 3C is a top view of the longitudinal end of the outlet opening of the exterior member 80 viewed from the inside of the fixing device 22 in the direction of arrow E in FIG. Here, since the configuration for closing the gap between the outlet opening and the peripheral surface of the fixing outlet roller pair 81 at the both ends in the longitudinal direction of the outlet opening of the exterior member 80 is the same, FIGS. ) Shows only one end. In the following description, only one end is performed.

  First, the configuration of the outlet opening and the fixing outlet roller pair 81 will be described. As shown in FIG. 2, the position in the sheet conveyance direction at the outlet opening at the center of the rotation axis of the fixing outlet roller pair 81 is substantially flush with the inner surface of the exterior member 80 that forms the outlet opening. Yes. Then, the opening peripheral end 90 of the fixing outlet roller pair 81 on both sides along the longitudinal direction of the outlet opening and the outer peripheral surface of the fixing outlet roller pair 81 facing the opening peripheral end 90 are brought into contact with each other. A gap between the opening peripheral end 90 and the outer peripheral surface of the fixing outlet roller pair 81 is closed.

  Further, as shown in FIGS. 3A to 3C, the gap between the end portions in the longitudinal direction of the exit opening is a roller contact of the roller end cover portion 92 provided on the longitudinal end portion side of the exit opening. The contact portion 93 and the peripheral surface of the fixing exit roller pair 81 are closed.

  The roller end cover portion 92 is provided on the end side in the longitudinal direction of the fixing exit roller pair 81 so as to protrude to the outside, and is a portion closer to the end than the portion through which the sheet of the fixing exit roller pair 81 passes. And has a substantially trapezoidal cross section. The side through which the sheet S passes, that is, the exit opening side is a wall extending in a direction perpendicular to the rotation axis of the fixing exit roller pair 81 to a position where it abuts on the outer peripheral surface of the fixing exit roller pair 81. Is formed. Roller contact in which the end of the above-mentioned wall, which is indicated by bold lines in FIGS. 3A and 3B and hatched in FIG. 3C, is in contact with the outer peripheral surface of the fixing exit roller pair 81 Part 93. The gap between the roller contact portion 93 and the outer peripheral surface of the fixing exit roller pair 81 is closed by contact.

  In this embodiment, the other three surfaces excluding the surface in the protruding direction of the substantially trapezoidal cross section of the roller end cover portion 92 and the surface on the outlet opening side are formed in an arc shape. A plate-shaped attachment member 91 is provided on the inner side of the exterior member 80 provided with the roller end cover portion 92 in order to support the rotation shaft end portion of the fixing outlet roller pair 81. It is provided perpendicular to the rotation shaft and supports the fixing exit roller pair 81.

  Next, the conveyance unit on the downstream side of the fixing device 22 in the sheet conveyance path R will be described. This conveying portion is connected to the outlet opening, and is bent in a substantially L shape on the left side in FIG. 2 and a straight line portion parallel to the sheet conveying direction in which the sheet S to be passed by the sheet cooling means 84 described later is cooled. It is comprised by the part in which the discharge roller pair 35 provided in connection with the exit 83 was provided. A guide plate 71 is provided on the inner side of the sheet conveyance path R that is bent in a substantially L shape on the left side, and a guide plate 72 is provided on the outer side of the sheet conveyance path R, and is conveyed downstream from the fixing device 22. The sheet S to be guided is guided to the sheet discharge port 83. Then, the sheets S discharged from the sheet discharge port 83 are stacked by sheet stack means (not shown) and discharged to a discharge stack unit 39 connected to a vertical wall portion below the sheet discharge port 83.

  Further, the sheet cooling unit 84 includes a vertical wall portion (hereinafter referred to as a stack portion wall portion) above the fixing device 22 and below the sheet discharge port 83 connected to the discharge stack portion 39, and a sheet conveyance path R. It is provided in a space formed by a guide plate 71 guided from the inside. Then, the air outside the apparatus main body 1 is sucked from the vent hole provided in the stack portion wall portion, and blown in the direction of W1 in FIG. 2, and the section before the sheet conveyance path R is bent in an L shape. The sheet S immediately after passing through the fixing outlet roller pair 81 after being heated by fixing is blown as cooling air through the ventilation holes provided in the guide plate 71 and cooled by air.

  The air that has been used for air-cooling the sheet S and has an increased temperature passes through the opening in the sheet width direction of the guide plate 72 that is provided to face the guide plate 71 with the conveyed sheet interposed therebetween. Is exhausted to the outside of the apparatus main body 1 through an exhaust means (not shown) provided in the apparatus.

  As described above, in this embodiment, the opening peripheral end 90 along the longitudinal direction of the outlet opening in the exterior member 80 that is a cover that covers the fixing device 22, and the roller contact portion 93 provided at the longitudinal end. And the fixing exit roller pair 81 are arranged so as to contact each other. Therefore, there is no gap between the outlet opening of the exterior member 80 and the fixing outlet roller pair 81, and the air heated by the fixing unit does not diffuse upward. Further, while the sheet S is conveyed through the fixing exit roller pair 81, only the nip portion of the fixing exit roller pair 81 is opened by the thickness of the sheet S. However, the fixing exit roller pair 81 has a predetermined pressing force. The sheet S is sandwiched. As a result, even in the sheet width of the sheet S and the portion where the sheet S is not sandwiched, the air heated by the fixing unit diffuses upward and the gap does not open as the temperature of the apparatus body 1 rises.

  The same applies to the case where the cooling air is blown to the sheet S by the sheet cooling unit 84. The cooling air does not flow from the outlet opening as the temperature of the fixing unit in the fixing device 22 decreases.

  Therefore, in the configuration of the present embodiment, a substantial gap at the outlet opening of the fixing device 22 can be eliminated regardless of whether the sheet S is being passed or not, so that heat can be prevented from flowing in and out. For this reason, even when the sheet cooling means 84 for cooling the sheet S immediately after arrival is used, air cooling air flows along the fixed sheet S to the fixing unit while securing the sheet S conveyance path. Can be prevented, and the temperature of the fixing portion is not lowered.

  Further, since it is possible to prevent the fixing temperature of the fixing unit from being lowered, it is not necessary to supply more heat than necessary due to the reduction in the fixing temperature, and energy consumption can be saved. In addition, since it is possible to perform desired sheet cooling without causing the temperature of the fixing unit to decrease at the downstream side of the fixing unit in the sheet conveyance direction, the heated sheet is conveyed in the conveyance path after the fixing while being heated. It is also possible to prevent problems.

  Further, in order to make the schematic configuration easy to understand in FIG. 2, a configuration in which the sheet cooling means 84 including the cooling fan 85 and the duct 86 takes in outside air near the discharge stack portion 39 that is the sheet discharge position and blows it on the sheet. It is shown. However, the position for taking in the outside air is not limited to this, and the outside air may be taken in by connecting a duct from the back of the machine body.

  Further, the configuration of the guide plates 71 and 72 is not limited to the configuration described above. For example, the air in the paper width direction opening of the guide plate 72 provided to face the guide plate 71 through the paper to be conveyed is air-cooled, and most of the air heated by the air is exhausted directly to the outside of the main body device 1. You may make it possible to suppress the temperature rise in the main device 1. As a configuration in which air heated by air cooling is directly exhausted to the outside of the main body device 1, the air heated directly to the outside of the main body device 1 is exhausted to one of the end portions of the guide plates 71 and 72 in the paper width direction. This can be realized by providing an exhausting means that can be opened and closed and a cover that can be opened and closed. If a paper jam or the like occurs, maintenance can be performed by opening the cover that can be opened and closed.

  In this embodiment, an example of a schematic configuration diagram of the vertical conveyance path is shown. However, the shape of the conveyance path is not limited to this, and when the horizontal conveyance path is used, the fixing device is rotated 90 degrees. What is necessary is just to make it the layout structure made.

  Further, the material of the fixing exit roller pair 81 is made of rubber (EPDM) used for a general transport roller as long as image quality and transport quality can be satisfied. Here, a film having a good sliding property such as a Teflon (registered trademark) tube may be provided on the roller surface so that the toner immediately after fixing is remelted and adhered to the roller surface, so that an abnormal image is hardly generated. Further, if the setting of the conveying speed with the upstream and downstream conveying means of the fixing outlet roller pair 81 is appropriate, the outer diameter and material of the fixing outlet roller pair 81 need not be the same for the driving roller and the driven roller. . For example, the decurling effect can be obtained by reducing the hardness of one of the fixing exit roller pair 81 and providing a nip shape opposite to the curling direction generated by the fixing roller pair.

(Example 2)
Next, a second embodiment which is another embodiment will be described. The second embodiment is different from the first embodiment described above in that the opening peripheral end 90 of the fixing outlet roller pair 81 on both sides along the longitudinal direction of the outlet opening and the peripheral surface of the fixing outlet roller pair 81 abut. It is different in the point not letting it. In this embodiment, a shielding member is provided in the vicinity of the outlet opening of the exterior member 80 along the longitudinal direction of the outlet opening, and the shielding member and the peripheral surface of the fixing outlet roller pair 81 are brought into contact with each other to shield the outer member 80. A gap between the member and the peripheral surface of the fixing exit roller pair 81 is closed. Since the other configuration is the same as that of the first embodiment, only different points will be described below.

  4A and 4B illustrate an example in which a shielding member is provided in the vicinity of the outlet opening of the exterior member 80 along the longitudinal direction of the outlet opening. In FIG. 4A, a plate-like mylar 88 that abuts the fixing outlet roller pair 81 is provided on the outer side of the outlet opening of the exterior member 80 as a shielding member, and the outer peripheral surface of the fixing outlet roller pair 81 is provided. The case where the side surface of the mylar 88 is contacted is shown. FIG. 4B shows the shape near the exit of the exterior member 80 as an inverted C shape that holds the fixing exit roller pair 81, and a sponge 87 is provided as a shielding member in a portion facing diagonally downward. The case where the sponge 87 is provided so as to contact the inner peripheral surface of the fixing exit roller pair 81 is shown.

  In the case where the shielding member is disposed, it is necessary to lay out so as not to be caught by the fixing outlet roller pair 81. In FIG. 4A, the tip of the mylar 88 abuts against the fixing outlet roller pair 81. Instead of this, an example in the case where the Mylar 88 is brought into surface contact is shown. 4A, the Mylar 88 is attached to the outside of the exterior member 80 (cover). However, even when the Mylar 88 is attached to the inside of the exterior member 80, the Mylar 88 is disposed so as not to be caught in the fixing exit roller pair 81. No problem. 4B shows an example in which a convex stopper 89 is provided on the exterior member 80 to prevent the sponge 87 from being caught.

  In this embodiment, the shielding member and the peripheral surface of the fixing exit roller pair 81 are brought into contact with each other along the longitudinal direction of the exit opening, and the gap between the contact portions is eliminated. It is possible to obtain the same operation and effect as in the case where the opening peripheral end portion 90 and the peripheral surface of the fixing outlet roller pair 81 are brought into contact with each other and the gap between the contact portions is eliminated.

  In order to tightly close the gap between the side surface portion of the fixing exit roller pair 81 and the shielding member provided on the exterior member 80, the shielding member is preferably an elastic body, and a member having excellent heat insulation is selected. Thus, it is possible to prevent heat from entering and leaving the fixing device 22. Further, for example, it is effective to arrange the shielding member so as to apply pressure so that the shielding member bites into the roller so that the gap is not opened.

  Further, as in the first exemplary embodiment, when the fixing outlet roller pair 81 is brought into contact with the opening peripheral end portion 90 of the exterior member 80 to close the gap, the dimension related to the contact portion of the exterior member 80 has high accuracy. Required. However, when the shielding member is used, the dimensional accuracy required for the portion of the exterior member 80 can be relaxed.

  Further, the position where the fixing outlet roller pair 81 and the shielding member are in contact with each other is above or below the plane including the rotation axis center of the fixing outlet roller pair 81 as long as the positional relationship does not affect the conveyance path. Good. In FIG. 4A, the shielding member abuts above the plane including the rotation axis center of the fixing outlet roller pair 81 and below FIG. 4B below the plane including the rotation axis center of the fixing outlet roller pair 81. The case where it was made to show is shown in figure.

  Further, since the exterior member 80 or the shielding member is in contact with the fixing exit roller pair 81 that is a rotating body, the contact portion is slid by coating with a material having good sliding property, such as Teflon (registered trademark). It may be possible to reduce wear of the fixing exit roller pair and the exterior member or the shielding member by securing the property.

(Example 3)
Furthermore, a third embodiment which is another embodiment will be described. The third embodiment is different from the first and second embodiments described above in that the roller contact portion 93 extended from the roller end cover portion 92 provided at the end in the longitudinal direction of the outlet opening of the exterior member 80 is fixed. The difference is that the outlet roller pair 81 is not in contact with the outlet roller pair 81. In this embodiment, instead of extending the exterior member 80 on the exit opening side of the roller end cover portion 92, a shielding member is provided, and the portion facing the peripheral surface of the fixing exit roller pair 81 is brought into contact with the exterior member 80 to shield it. A gap between the member and the peripheral surface of the fixing exit roller pair 81 is closed. Since the other configuration is the same as that of the first and second embodiments, only the differences will be described below.

  Fig.5 (a) is a perspective view from the exterior side of the edge part of the longitudinal direction of the opening part of the exterior member 80 (cover). FIG. 5B is a cross-sectional view from the axial direction of the fixing outlet roller pair 81 when the longitudinal end of the outlet opening of the exterior member 80 is viewed from the direction of arrow F in FIG. is there. FIG. 5C is a top view of the longitudinal end of the outlet opening of the exterior member 80 viewed from the inside of the fixing device 22 in the direction of arrow E in FIG. Here, the configuration for closing the gap between the shielding member provided on the exit opening side of the roller end cover 92 and the peripheral surface of the fixing exit roller pair 81 at both ends in the longitudinal direction of the exit opening of the exterior member 80 is the same. Therefore, as in the first embodiment, only one end is shown in FIGS. 5 (a) to 5 (c). In the following description, only one end is performed.

  5A and 5B, the clearance between the peripheral surface of the fixing outlet roller pair 81 and the outlet opening side of the roller end cover portion 92 is the gap between the peripheral surface of the fixing outlet roller pair 81 and the roller end cover portion 92. A sponge 94 provided as a shielding member is brought into contact with the exit opening side, and the peripheral surface of the fixing exit roller pair 81 and the sponge 94 are brought into contact with each other to close the seal. Moreover, the end part along a longitudinal direction has illustrated about an example which contact | abutted the mylar and closed the clearance gap similarly to Fig.4 (a) of Example 2. FIG.

  In this embodiment, the end of the exit opening in the longitudinal direction, as described above, the shielding member and the peripheral surface of the fixing exit roller pair 81 are brought into contact with each other, and the clearance between the contacted portions is eliminated. The roller contact portion 93 extended on the exit opening side of the roller end cover portion 92 of Example 1 is brought into contact with the peripheral surface of the fixing exit roller pair 81, and the clearance between the contact portions is set. It is possible to obtain the same effect as when it is eliminated.

  Further, the shielding member used here is not limited to the sponge 94 described above, and may be a member that is an elastic body and excellent in heat insulation. For example, in the case of a plate-like mylar, the end of the portion that extends on the outlet opening side of the roller end cover portion 92 of the first embodiment is about 2 to 4 mm from the peripheral surface of the fixing outlet roller pair 81, for example. A plate-shaped mylar formed in accordance with the shape of the peripheral surface of the fixing outlet roller pair 81 is attached to the sheet passing portion side, and the plate-shaped mylar and the fixing outlet roller pair are formed. You may comprise so that the clearance gap between 81 may be plugged up.

  Since the shielding member is used at the end portion in the longitudinal direction of the outlet opening portion in the same manner as the portion along the longitudinal direction of the outlet opening portion described in the second embodiment, the exterior member is configured. It is possible to relax the dimensional accuracy required for the 80 locations.

  FIG. 6 is a conceptual diagram in which the copying machine 100, which is the image forming apparatus of the present embodiment, is divided for each function. Further, a user can set printing conditions (paper) by a display input unit (operation panel) as shown in FIG. It is a known technique that the type / size etc. can be selected. In addition, the air cooling amount (spraying amount) of the sheet cooling means is set according to the type and size of the sheet and the printing conditions, and an optimum cooling effect can be obtained by selecting it with the display input unit.

  Further, a mode in which the paper cooling is not performed with the spray amount set to zero may be selected, or the user may be able to set the air volume separately regardless of the printing conditions. Generally, the fixing temperature is generally set higher when printing on thick paper than on plain paper, so the amount of heat carried by the paper after fixing tends to be simply larger than that of plain paper. Further, regarding the paper size, if the fixing temperature / number of printed sheets is the same, the large amount of paper simply increases the amount of heat carried by the paper after fixing. As described above, by adjusting the air volume for each use condition, it is possible to obtain an optimal cooling effect and to reduce the power consumption in the cooling means.

The copying machine 100 as an image forming apparatus according to the present embodiment includes a transfer device 13 that transfers a toner image onto a sheet conveyed from the sheet cassette 61 of the sheet bank 3, and heats and pressurizes the toner image transferred onto the sheet. A fixing device 22 for fixing the sheet is provided. In addition, a discharge roller pair 35 that conveys the sheet on which the toner image is fixed to a discharge portion 39 and a conveyance portion that is a conveyance path downstream from the fixing portion formed by the conveyance guide plates 71 and 72, and the fixing device 22. And an exterior member 80 (cover) that covers the fixing device 22 that is open at a portion connecting the upstream and downstream conveyance paths. In addition, a fixing exit roller pair 81 is provided as a pair of through rollers nipping over the entire width of the paper disposed at the exit of the fixing device 22. Then, the fixing outlet roller pair 81 comes into contact with the opening peripheral end 90 of the exterior member 80, and the gap between the opening peripheral end 90 and the fixing outlet roller pair 81 at the location connecting the downstream conveyance path of the exterior member 80 is blocked. It is. The outlet opening side of the roller end cover portion 92 provided on the end side in the longitudinal direction of the outlet opening extends toward the peripheral surface of the fixing outlet roller pair 81, and the extended roller abutment. The portion 93 is in contact with the peripheral surface of the fixing outlet roller pair 81 to block the gap. With such a configuration, it is possible to prevent wind from flowing in and out on the downstream side in the sheet conveyance direction of the exterior member 80 that covers the fixing unit regardless of whether or not the sheet S is being passed. For this reason, the temperature of the fixing unit is not lowered due to the inflow and outflow of wind on the downstream side of the fixing unit in the sheet conveying direction while securing the sheet conveying path. In addition, since it is possible to prevent the fixing temperature of the fixing unit from being lowered, it is not necessary to supply more heat than necessary due to the reduction of the fixing temperature, and energy consumption can be saved.
In addition, a shielding member that contacts the fixing outlet roller pair 81 and closes a gap between the fixing outlet roller pair 81 and an opening at a location connecting the downstream conveying path of the outer member 80 that covers the fixing device 22 is disposed on the outer member 80. Has been. By adopting such a configuration, the gap can be reliably closed even if the shape and size of the contact portion of the exterior member 80 with the fixing outlet roller pair 81 is rough.
Further, a sheet cooling unit 84 for cooling the sheet with air is provided between the fixing exit roller pair 81 and the discharge roller pair 35 disposed at the exit of the fixing unit. By adopting such a configuration, it is possible to cool the sheet at a high temperature immediately after fixing by air cooling without causing a decrease in the fixing temperature of the fixing unit of the fixing device 22. Further, by using air cooling as the paper cooling method, the component configuration can be simplified, and the cost required for paper cooling can be reduced.
Further, the sheet cooling means 84 includes a duct 86 for taking in outside air and a cooling fan 85, and cools the sheet by blowing outside air onto the sheet on which the toner image is fixed. It becomes possible to blow low-temperature air on the paper, and a high cooling effect is obtained.
In addition, since the amount of spray on the paper on which the toner image is fixed by the cooling fan 85 can be set in at least two stages, it is possible to set the appropriate air volume according to the paper temperature after fixing and cool the paper.
In addition, since the amount of spraying on the paper on which the toner image is fixed by the cooling fan 85 is set according to the type and size of the paper, cooling can be performed with an appropriate air volume.

1. Apparatus body (image forming unit) of copying machine according to the present embodiment
2. Image reading apparatus (image reading unit) of copying machine according to this embodiment
3. Sheet bank (paper storage unit) of copier according to the present embodiment
4. Automatic Document Conveying Device of Copying Machine According to this Embodiment 10 Photosensitive Member 11 Charging Device 12 Developing Device 13 Transfer Device 14 Cleaning Device 20 Toner Replenishing Device 21 Registration Roller 22 Fixing Device 23 Fixing Heater 24 Fixing Roller Pair 35 Discharge Roller Pair 71 A conveyance guide plate that guides the sheet conveyance path R from the inside 72 A conveyance guide plate that guides the sheet conveyance path R from the outside 80 An exterior member that covers the fixing device 81 A pair of fixing outlet rollers 82 Provided in the fixing device Conveyance guide plate 83 Sheet discharge port 84 Paper cooling means 85 Cooling fan provided in the paper cooling means 86 Duct provided in the paper cooling means 87 Shielding member made of sponge 88 Shielding member made of mylar 89 Conveyance provided in the fixing device Guide plate 90 Opening edge of exterior member (cover) 91 Exterior Material copying machine according to the shield member 100 embodiment having the sponge provided in the longitudinal end portion of the opening peripheral edge portion of the (cover)

JP 2002-0662702 A Japanese Patent Laid-Open No. 11-352840 Japanese Patent Application Laid-Open No. 7-064422

Claims (6)

  1. A transfer unit that transfers the toner image onto the paper conveyed from the paper stacking unit;
    A fixing unit that heats and pressurizes the toner image transferred to the paper and fixes it on the paper;
    A conveying unit is a conveying path which the toner image is formed from a pair of conveying rollers for conveying the image-fixed sheet to the discharge unit and the conveyance guide plate, located downstream of the fixing unit,
    An exterior member that includes an opening at each of the locations connecting the fixing unit and the upstream and downstream conveyance paths and covers the fixing unit;
    A pair of threading rollers that nip the entire width or more of the paper provided at the exit of the fixing unit;
    In the image forming apparatus to have a,
    A portion of each of the peripheral surface at the two through rollers of the threading rollers protrude out of the outer member from the opening of the outlet side of the outer member,
    One of the two long side inner walls, which are the inner walls of the opening extending in the longitudinal direction of the opening along the roller axis direction, among the four inner walls of the opening surrounding the opening on the outlet side formed in a rectangular shape in the exterior member. In addition, one circumferential surface of the two passing rollers is brought into contact with each other to close a gap between the one inner side wall and the one passing roller,
    The other peripheral surface of the two through rollers is brought into contact with the other of the two long side inner walls to close the gap between the other long side inner wall and the other through roller,
    The concave curved surface in a concave curved surface member that has a concave curved surface that abuts on the convex curved surface that protrudes from the opening on the outlet side of the two through rollers and that is formed integrally with or separately from the exterior member. One of the two short side inner walls, which are the inner walls of the opening extending out of the four inner walls of the opening, and the two axial rollers in the roller axial direction. Block the gap with one end of
    The concave curved surface member of the concave curved surface member different from the concave curved surface member is brought into contact with the other end portion of the convex curved surface in the roller axial direction, so that the other inner side wall of the two short sides and the roller axial line of the two passing rollers An image forming apparatus characterized by closing a gap with the other end in the direction .
  2. A transfer unit that transfers the toner image onto the paper conveyed from the paper stacking unit;
    A fixing unit that heats and pressurizes the toner image transferred to the paper and fixes it on the paper;
    A conveying unit is a conveying path which the toner image is formed from a pair of conveying rollers for conveying the image-fixed sheet to the discharge unit and the conveyance guide plate, located downstream of the fixing unit,
    An exterior member that includes an opening at each of the locations connecting the fixing unit and the upstream and downstream conveyance paths and covers the fixing unit;
    A pair of threading rollers that nip the entire width or more of the paper provided at the exit of the fixing unit;
    In the image forming apparatus to have a,
    A portion of each of the peripheral surface at the two through rollers of the threading rollers protrude out of the outer member from the opening of the outlet side of the outer member,
    One of the two long side inner walls which are the inner walls of the opening extending in the longitudinal direction of the opening along the roller axis direction among the four inner walls of the opening surrounding the opening on the outlet side formed in a rectangular shape in the exterior member. A shielding member that is in contact with one circumferential surface of the two threading rollers and closes a gap between the one long side inner wall and the one threading roller,
    A shielding member that contacts the other peripheral surface of the two through rollers and closes the gap between the other long side inner wall and the other through roller in a state of being fixed to the other of the two long side inner walls. Provided,
    The concave curved surface in a concave curved surface member that has a concave curved surface that abuts on the convex curved surface that protrudes from the opening on the outlet side of the two through rollers and that is formed integrally with or separately from the exterior member. One of the four inner walls of the opening and the two inner walls of the short side which is the two inner walls of the opening and the two roller rollers in the axial direction of the roller Block the gap with one end of
    The concave curved surface member of the concave curved surface member different from the concave curved surface member is brought into contact with the other end portion of the convex curved surface in the roller axial direction, so that the other inner side wall of the two short sides and the roller axial line of the two passing rollers An image forming apparatus characterized by closing a gap with the other end in the direction .
  3. The image forming apparatus according to claim 1, wherein
    An image forming apparatus comprising: a sheet cooling unit that cools a sheet between a through roller pair disposed at an exit of the fixing unit and the conveying roller pair.
  4. The image forming apparatus according to claim 3.
    The image forming apparatus, wherein the sheet cooling means includes a duct for taking in outside air and a cooling fan, and cools the sheet by blowing outside air onto the sheet on which the toner image is fixed.
  5. The image forming apparatus according to claim 3 or 4,
    2. An image forming apparatus according to claim 1, wherein the amount of spraying of the cooling fan onto the sheet on which the toner image is fixed can be set in at least two stages.
  6. The image forming apparatus according to any one of claims 3 to 5,
    An image forming apparatus according to claim 1, wherein the amount of spraying of the cooling fan onto the sheet on which the toner image is fixed is set according to the type and size of the sheet.
JP2010060000A 2010-03-16 2010-03-16 Image forming apparatus Expired - Fee Related JP5472810B2 (en)

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US9046831B2 (en) 2010-03-05 2015-06-02 Konica Minolta Business Technologies, Inc. Fixing device and image forming apparatus capable of effectively suppressing thermal energy released externally from device due to thermal convection and hot air flow
JP5093273B2 (en) * 2010-03-19 2012-12-12 コニカミノルタビジネステクノロジーズ株式会社 Fixing apparatus and image forming apparatus
JP2011197406A (en) * 2010-03-19 2011-10-06 Konica Minolta Business Technologies Inc Fixing device and image forming apparatus
JP5267492B2 (en) 2010-03-23 2013-08-21 コニカミノルタビジネステクノロジーズ株式会社 Fixing apparatus and image forming apparatus
JP5728461B2 (en) 2012-11-27 2015-06-03 京セラドキュメントソリューションズ株式会社 Image forming apparatus
JP6137912B2 (en) * 2013-04-01 2017-05-31 キヤノン株式会社 Image forming apparatus
JP6256233B2 (en) 2014-07-17 2018-01-10 コニカミノルタ株式会社 Paper conveying apparatus, image forming apparatus, and image forming system
JP6428063B2 (en) * 2014-09-04 2018-11-28 富士ゼロックス株式会社 Image forming apparatus
JP5901816B2 (en) * 2015-04-06 2016-04-13 京セラドキュメントソリューションズ株式会社 Image forming apparatus
JP6281523B2 (en) * 2015-04-27 2018-02-21 京セラドキュメントソリューションズ株式会社 Image forming apparatus
JP2019179100A (en) 2018-03-30 2019-10-17 株式会社リコー Cooling device and image forming apparatus

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JPH04306686A (en) * 1991-04-03 1992-10-29 Canon Inc Fixing device
JP2007086509A (en) * 2005-09-22 2007-04-05 Fuji Xerox Co Ltd Fixing unit and image forming apparatus
JP2007163642A (en) * 2005-12-12 2007-06-28 Konica Minolta Business Technologies Inc Image forming apparatus
JP2008145636A (en) * 2006-12-08 2008-06-26 Canon Inc Fixing device and image forming apparatus
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