Image formation apparatus
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- CANON KK
- Filing Date
- 2023-06-14
- Publication Date
- 2026-05-20
AI Technical Summary
The arrangement of bundled wires in a manual feed tray of an image forming apparatus poses a risk of wire breakage due to contact with movable fans, leading to unnecessary costs and redundancy.
The image forming apparatus is designed with movable fan motors and side regulating plates that allow bundled wires to be arranged at an appropriate length, avoiding contact with the fans by routing them outside the movable areas and optimizing the wire length to minimize redundancy.
This configuration prevents wire breakage and reduces unnecessary costs by optimizing the bundled wire length, ensuring efficient operation of the manual feed section.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present invention relates to an image forming apparatus including a manual sheet feeder capable of blowing air onto a stack of sheets to separate the stack of sheets. [Background technology]
[0002] In recent years, electrophotographic image forming apparatuses such as copying machines, printers, and facsimiles have come to be popularized as colored and high-image-quality devices. Users of image forming apparatuses used in offices are also demanding print products with higher image quality and higher resolution.
[0003] Generally, the paper used in office image forming devices is often plain paper or recycled paper. However, there is a limit to how well plain paper can produce the required beautiful and attractive output. Therefore, in order to produce more beautiful and attractive output, special paper such as coated paper and thick paper is becoming more and more desirable.
[0004] Conventionally, in order to feed special paper in image forming apparatuses, manual feed devices have been attached to the side walls of the image forming apparatuses. This is because the manual feed device can be used for paper sizes that cannot be set in the cassette feed device inside the image forming apparatus (long paper, non-standard size paper, small size paper) and high-rigidity thick paper that has a large transport resistance and cannot be transported unless the transport path is straight.
[0005] Such manual feed devices have the advantage that the user can visually observe the paper because they are attached to the side wall of the image forming apparatus. In other words, the user can manually separate the paper and set it in the feed tray, and feed the paper while watching the feeding status. For example, if there is uneven separation, the user can manually separate the paper again and set it again to reduce the occurrence of paper jams. However, if time passes after separation, the paper may again stick to each other, causing a paper jam.
[0006] As a method of resolving such problems, Patent Document 1 proposes a technology in which an air blowing section is provided that blows air onto the paper loaded on a manual feed tray, which is a manual feed device, and the loaded paper is separated by air, allowing the paper to be fed continuously.
[0007] In Patent Document 1, the air blowing unit is arranged and fixed outside the manual feed tray, but when trying to miniaturize the device, it is desirable to arrange the air blowing unit inside the manual feed tray. In this case, one of the means for blowing air onto the stacked paper is a method of blowing air from a side regulating plate that sets the paper size of the manual feed tray in the width direction. In order to use the side regulating plate as an air passage, the fan for blowing air needs to move together with the side regulating plate that moves to set the paper size. In this case, the movable range of the fan is configured such that one fan moves on one side of the sheet width direction together with one side regulating plate, and the other fan moves on the other side together with the other side regulating plate. [Prior art documents] [Patent documents]
[0008] [Patent Document 1] JP 2006-256819 A Summary of the Invention [Problem to be solved by the invention]
[0009] In the above-mentioned configuration, the cable arranged inside the manual feed tray needs to be arranged to avoid the moving area of the fan, since if it comes into contact with the fan or surrounding components and breaks, it needs to be arranged to avoid the moving area of the fan. This causes a problem that the cable becomes redundant due to the path of the cable relative to the moving fan, resulting in extra costs.
[0010] The present invention has been made in consideration of the above circumstances, and aims to provide an image forming apparatus in which a cable can be arranged with an appropriate cable length relative to a fan that can move together with a side regulating plate to blow air onto sheets loaded in a manual feed section. [Means for solving the problem]
[0011] In order to achieve the above object, the present invention provides an image forming unit that forms an image on a sheet, a manual feed unit that can feed a manually-fed sheet toward the image forming unit, a first side regulating unit that is movable in a sheet width direction perpendicular to the sheet feed direction of the manual feed unit and that regulates one position in the sheet width direction, a second side regulating unit that is movable in the sheet width direction of the manual feed unit and that regulates the other position in the sheet width direction, and a first fan motor that is movable together with the first side regulating unit and has a movable area on one side in the sheet width direction for blowing air onto a sheet placed on the manual feed unit. The image forming apparatus has a second fan motor that is movable together with the second side regulating portion and has a movable area on the other side of the sheet width direction downstream of the manual feed section in the sheet feeding direction from the first fan motor for blowing air onto a sheet placed on the manual feed section, a control portion that is arranged on one side of the sheet width direction downstream of the manual feed section in the sheet feeding direction from the first fan motor and the second fan motor for controlling the first fan motor and the second fan motor, and a first fan motor bundling portion that is pulled out from the first fan motor in the direction opposite to the other side of the sheet width direction and wired to pass outside the movable area of the second fan motor and be connected to the control portion. Effect of the Invention
[0012] According to the present invention, it is possible to provide an image forming apparatus in which a cable can be arranged with an appropriate cable length relative to a fan that can move together with a side regulating plate to blow air onto sheets loaded in a manual feed section. [Brief description of the drawings]
[0013] [Figure 1] 1 is a schematic front cross-sectional view of an image forming apparatus according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a circuit block diagram according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a top view of a manual feed section according to the embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of a manual feed section according to the embodiment of the present invention. [Diagram 5] FIG. 11 is a schematic diagram of a manual feed section viewed from below, illustrating a comparative example for explaining features of an embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram of a manual feed section according to the embodiment of the present invention as viewed from below. [Figure 7] FIG. 11 is a schematic diagram of a manual feed section according to another embodiment of the present invention, as viewed from below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the components described in the following embodiments are merely examples, and various conditions such as the configuration, function, dimensions, materials, shape, and relative arrangement of the device to which the present invention is applied can be appropriately modified or changed without departing from the spirit of the present invention, and are not limited to the following embodiments.
[0015] FIG. 1 is a schematic front sectional view of an image forming apparatus according to an embodiment of the present invention.
[0016] In Fig. 1, 200 denotes an image forming apparatus, which is a tandem type intermediate transfer type laser beam printer using an electrophotographic process. The image forming apparatus 200 can form and output a full-color or monochrome image corresponding to print image data output from a host device 900 connected to a control unit 100 shown in Fig. 2, which will be described later, on a sheet S, which is a recording medium.
[0017] Reference numeral 201 denotes an image forming apparatus main body, and reference numeral 202 denotes an image reading device installed approximately horizontally above the image forming apparatus main body 201. Between this image reading device 202 and the image forming apparatus main body 201, an ejection space V for ejecting sheets is formed.
[0018] Reference numeral 230 denotes a cassette feeding section that feeds a sheet S from a feeding cassette 1, which is a sheet storage means for storing the sheet S. The cassette feeding section 230 includes a pickup roller 2, which is a sheet feeding means, and a separation section that includes a feed roller 3 and a retard roller 4 for separating the sheet S sent out from the pickup roller 2.
[0019] Also, 235 denotes a manual feed section capable of feeding a manual sheet S from a manual feed tray 5 which is a means for placing a sheet S. Similarly to the cassette feed section 230, the manual feed section 235 includes a pickup roller 502 which is a sheet feeding means, and a separation section including a feed roller 503 and a retard roller 504 for separating the sheet S sent out from the pickup roller 502.
[0020] 201A is an image forming unit which is an image forming means for forming an image on a sheet, and is a four-drum full-color type. The image forming unit 201A is equipped with a laser scanner 210 and four process cartridges 211Y, 211M, 211C, and 211K which form toner images of four colors, yellow (Y), magenta (M), cyan (C), and black (K). Here, each of the process cartridges 211Y, 211M, 211C, and 211K is equipped with a photosensitive drum 212Y, 212M, 212C, and 212K, a charger 213Y, 213M, 213C, and 213K which is a charging means, and a developer 214Y, 214M, 214C, and 214K which is a developing means. The image forming unit 201A also includes a secondary transfer unit 201D and a fixing unit 201E disposed above the process cartridges 211Y, 211M, 211C, and 211K. Reference numeral 215 denotes a toner cartridge for supplying toner to the developing devices 214Y, 214M, 214C, and 214K, respectively.
[0021] A transfer belt 216 wound around a drive roller 216a and a tension roller 216b is disposed above the photosensitive drums 212Y, 212M, 212C, and 212K. Primary transfer rollers 219Y, 219M, 219C, and 219K are disposed inside the transfer belt 216 and contact the transfer belt 216 at positions facing the photosensitive drums 212Y, 212M, 212C, and 212K, respectively, forming a primary transfer section. The transfer belt 216 is rotated in the direction of arrow H by a drive roller 216a driven by a drive section (not shown). A secondary transfer roller 217 that transfers a color image formed on the transfer belt 216 to a sheet S is disposed at a position facing the drive roller 216a, forming a secondary transfer section 201D.
[0022] Furthermore, a fixing section 201E is disposed above the secondary transfer roller 217, and a first discharge roller pair 225a, a second discharge roller pair 225b, and a double-sided reversing section 201F are disposed at the upper left of the fixing section 201E. The double-sided reversing section 201F is provided with a reversible roller pair 222 and a re-conveying path R for conveying the sheet S, on one side of which an image has been formed, again to the image forming section 201A.
[0023] An input display device 730 for receiving operations from a user is provided on the upper portion of the image forming apparatus main body 201. The input display device 730 is of a touch panel type that is capable of not only displaying but also inputting information.
[0024] FIG. 2 is a circuit block diagram for controlling the image forming apparatus of FIG.
[0025] 2, the control unit 100 is a control circuit that controls the overall operation of the image forming apparatus 200, and transmits and receives information to and from the host device 900 and the input display device 730. The control unit 100 also performs signal processing and sequence control for various process devices. Here, the host device 900 is a personal computer, an image scanner, a facsimile machine, or the like.
[0026] The control unit 100 also transmits and receives information to and from a storage unit 101 that is configured from a RAM and a ROM. The storage unit 101 stores various control programs and the like.
[0027] The control unit 100 is also connected to fan motors 15a and 15b, which will be described later, for blowing air through the sheets stacked on the manual feed unit 235, and controls the fan motors 15a and 15b.
[0028] Furthermore, the control unit 100 is connected to sheet detection sensors 505a and 505b, which will be described later, for detecting sheets placed on the manual feed unit 235.
[0029] Next, the image forming operation of the image forming apparatus 200 will be described.
[0030] 1 and 2, first, in the image forming apparatus 200, when the control unit 100 receives image data of an original to be printed from the host device 900, the image information is subjected to image processing and then transmitted to the laser scanner 210 of the image forming unit 201A. In the image forming unit 201A, the surfaces of the photoconductor drums 212Y, 212M, 212C, and 212K, the surfaces of which are uniformly charged to a predetermined polarity and potential by the chargers 213Y, 213M, 213C, and 213K, are sequentially exposed by the laser scanner 210. As a result, electrostatic latent images of yellow, magenta, cyan, and black are sequentially formed on the photoconductor drums Y, 212M, 212C, and 212K of the process cartridges 211Y, 211M, 211C, and 211K, respectively.
[0031] Thereafter, the electrostatic latent images are developed and visualized with toners of the respective colors by the developers 214Y, 214M, 214C, and 214K, and the toner images of the respective colors on the photoconductor drums 212Y, 212M, 212C, and 212K are transferred in sequence onto the transfer belt 216 in a superimposed manner by a primary transfer bias applied to the primary transfer rollers 219Y, 219M, 219C, and 2129. As a result, a toner image is formed on the transfer belt 216.
[0032] In parallel with this toner image forming operation, the sheets S are conveyed one by one by the cassette feeding unit 230 or the manual feeding unit 235 to the pair of registration rollers 240, and skew is corrected by the pair of registration rollers 240. After skew is corrected, the sheets S are conveyed to the secondary transfer unit 201D by the pair of registration rollers 240, and in the secondary transfer unit 201D, the toner images on the transfer belt 216 are transferred all at once onto the sheets S by the secondary transfer bias applied to the secondary transfer roller 217.
[0033] Then, the sheet S onto which the toner image has been transferred is transported to the fixing section 201E, where the toner of each color melts and mixes with heat and pressure in the roller nip portion formed by the pressure roller 220a and the heating roller 220b, and is fixed onto the sheet S as a color image.
[0034] The sheet S with the image fixed thereon is discharged to the discharge space V by a first discharge roller pair 225a and a second discharge roller pair 225b provided downstream of the fixing section 201E, and is loaded onto a discharge tray 223 protruding from the bottom surface of the discharge space V.
[0035] When images are formed on both sides of the sheet S, after the images are fixed in the fixing section 201E, the sheet S is transported to a re-transport path R by a pair of reversing rollers 222 and transported again to the image forming section 201A.
[0036] Next, the manual feed section 235 having the air blowing section will be described.
[0037] 3A and 3B show top views of the manual feed section 235, with FIG. 3A showing a state in which the side regulating plates are open, and FIG. 3B showing a state in which the side regulating plates are closed.
[0038] In FIG. 3, the manual feed section 235 includes a manual feed tray 5, which is a means for placing sheets as described above, and a pickup roller 502, which is a sheet feeding means, and a separation section consisting of a feed roller 503 and a retard roller 504 for separating the sheet S sent out from the pickup roller 502.
[0039] The manual feed tray 5 is provided with side regulating plates 14a, 14b as side regulating sections that can be moved in a direction (sheet width direction) perpendicular to the arrow X indicating the sheet feeding direction relative to the sheet loading surface to a position for regulating a wide sheet as shown in FIG. 3(A) and a position for regulating a narrow sheet as shown in FIG. 3(B).
[0040] Fan motors 15a, 15b are attached to the side regulating plates 14a, 14b so as to be movable together with the side regulating plates 14a, 14b, respectively, and are capable of blowing loosening air 1A, 2A, and 1B, 2B onto the sides of the stacked sheets S via blowing nozzles 16a, 17a, and 16b, 17b. By blowing the air from the fan motors 15a, 15b as loosening air toward the ends of the sheets along the flow lines 1A, 2A, and 1B, 2B, the air enters the gaps between the sheets, causing the upper sheets to float up and reducing the adhesion between the sheets.
[0041] When the start button on the input display device 730 is pressed and the sheet detection sensors 505a and 505b detect that a sheet is placed on the manual feed tray 5, the sheet feeding starts. If the sheet to be fed is a coated sheet, the fan motors 15a and 15b of the side regulating plates 14a and 14b are operated to blow air onto the widthwise ends of the sheet through the blowing nozzles 116a and 17a, and 16b and 17b before the sheet feeding starts. Then, after a predetermined time, the pickup roller 502 rotates, and the sheet S, which is the top coated sheet in a state in which the adhesive force between the coated sheets is reduced, is sent to a separation section consisting of a feed roller 503 and a retard roller 504, separated into one sheet, and sent to the above-mentioned registration roller pair 240 by the conveying roller pair 506.
[0042] As described above, the subsequent operation is that the toner image is transferred to the sheet S at the secondary transfer section 201D at a timed interval, and then the toner image is fixed to the sheet S at the fixing section 201E, and the sheet S is discharged onto the discharge tray 223 by the first discharge roller pair 225a.
[0043] On the other hand, when forming a double-sided image, the sheet is inverted in the double-sided inversion section 201F and transported again to the pair of registration rollers 240 via the re-transport path R. Thereafter, the toner image is transferred and fixed in the same manner as for the first side, and the sheet is discharged onto the discharge tray 223, completing a series of image formation processes.
[0044] FIG. 4 is a cross-sectional view taken along line G-G of FIG.
[0045] 4, the fan motor 15b is mounted inside the housing of the manual feed tray 5 below the sheet stacking surface 5a of the manual feed tray 5. In this embodiment, a relatively low-cost axial flow fan is mounted as the fan motors 15a and 15b.
[0046] When coated paper or the like is set in the manual feed section 235 and a feed operation is instructed, the fan motor 15b starts to drive. This causes external air to be taken in as shown by flow line E from an air intake (not shown) provided in the exterior section 5b of the manual feed tray 5. An air duct 141b is formed inside the side regulating plate 14b. Therefore, air is sent to the air duct 141b on the air blowing direction side of the fan motor 15b as shown by flow line D. Furthermore, blowing nozzles 16b and 17b are arranged at two locations on the sheet regulating surface of the side regulating plate 14b. The air discharged from the fan motor 15b travels inside the air duct 141b as shown by flow lines C and B, and is blown as loosening air as shown by flow lines 1B and 2B from the two blowing nozzles 16b and 17b to the end of the stacked sheets S.
[0047] On the other hand, the blowing nozzles 16A and 17A shown in FIG. 3 also blow air onto the ends of the stacked sheets S by the fan motor 15a.
[0048] 4, a lower right door 601 is provided below the manual feed section 235 to clear jams in the cassette feed section 230. The lower right door 601 rotates on a hinge 602, and the upper end portion rotates to describe a rotation locus 603. To avoid this rotation locus 603, a cutout portion 5c is provided in a part of the manual feed tray 5.
[0049] Next, the movement of the fan motors 15a, 15b in the above configuration and the arrangement of cables connecting the fan motors 15a, 15b to the control unit 100 will be described with reference to FIGS.
[0050] 5 to 7 are schematic diagrams of the manual feed section 235 as viewed from below.
[0051] FIG. 5 is shown as a comparative example to explain the features of this embodiment, with FIG. 5(A) showing the position of fan motors 15a, 15b with the side regulating plates open, and FIG. 5(B) showing the position of fan motors 15a, 15b with the side regulating plates closed.
[0052] 5, a sheet placed on manual feed section 235 is fed in the direction of arrow Z in Fig. 5 from above toward the downward direction where manual feed section 235 is connected to image forming apparatus 200. Here, control section 100 is configured to be located to the right of manual feed section 235. Rectangular dashed lines 15A and 15B indicate the movable ranges of fan motors 15a and 15b that move together with side regulating plates 14a and 14b, respectively.
[0053] Figure 5 shows a case in which fan motor 15b moves together with side regulating plate 14b on the upstream side of manual feed section 235 in the sheet feeding direction (upper side of Figure 5) with its movable range 15B positioned from the center to the left (opposite direction to the arrangement of control unit 100), and fan motor 15a moves together with side regulating plate 14a on the downstream side of manual feed section 235 in the sheet feeding direction (lower side of Figure 5) with its movable range 15A positioned from the center to the right (in the direction of arrangement of control unit 100).
[0054] In such a configuration, when the cable 51 connecting the control unit 100 to the fan motors 15a and 15b and the sheet detection sensors 505a and 505b is arranged, the cable 51 for the fan motor and the cable 51 for the sheet detection sensor from the fan motor 15b and the sheet detection sensor 505a may come into contact with the movable area 15A of the fan motor 15a, and the risk of disconnection increases. Therefore, the cable 51 for the fan motor and the cable 51 for the sheet detection sensor connecting the control unit 100 to the fan motor 15b and the sheet detection sensor 505a must be routed outside the movable area 15A of the fan motor 15a as shown in FIG. 5. In that case, the cable 51 from the fan motor 15b and the sheet detection sensor 505a to the control unit 100 arranged on the right side must detour around the opposite side of the control unit 100, which increases the length of the cable and leads to unnecessary cost increase.
[0055] Therefore, in this embodiment, the configuration shown in Fig. 6 is used. Fig. 6 is a schematic diagram of the feeding section 235 as seen from below, similar to Fig. 5, in which Fig. 6(A) shows the positions of the fan motors 15a and 15b with the side regulating plates open, and Fig. 6(B) shows the positions of the fan motors 15a and 15b with the side regulating plates closed.
[0056] 6, a sheet placed on manual feed section 235 is fed in the direction of arrow Z from above toward the downward direction where manual feed section 235 is connected to image forming apparatus 200, similar to FIG. 5. Control section 100 is located to the right of manual feed section 235, similar to FIG.
[0057] On the other hand, the fan motor 15a that moves together with the side regulating plate 14a is disposed on the upstream side (upper side in FIG. 6) of the manual feed section 235 in the sheet feeding direction, and its movable area 15A is disposed from the center to the right (the arrangement direction of the control section 100), and the fan motor 15b that moves together with the side regulating plate 14b is disposed on the downstream side (lower side in FIG. 6) of the manual feed section 235 in the sheet feeding direction, and its movable area 15B is disposed from the center to the left (the opposite direction to the arrangement direction of the control section 100). The fan motor bundled wire portion and the sheet detection sensor bundled wire portion of the bundled wire 51 that connects the fan motor 15a and the sheet detection sensor 505a to the control section 100 are drawn out to the right (toward the control section 100) as shown in FIG. 6, and are disposed so as to pass outside the movable area 15B of the fan motor 15b and head toward the control section 100.
[0058] As a result, the length of the cable bundle from the fan motor 15a and the sheet detection sensor 505a to the control unit 100 located on the right side can be optimized without having to detour around the opposite side of the control unit 100 as in the comparative example of Figure 5.
[0059] Fig. 7 shows the configuration of another embodiment in which the control unit 100 is located on the left side of the manual feed unit 235. Fig. 7 is a schematic diagram of the manual feed unit 235 as seen from below, similar to Fig. 5, in which Fig. 7(A) shows the positions of the fan motors 15a and 15b with the side regulating plates open, and Fig. 7(B) shows the positions of the fan motors 15a and 15b with the side regulating plates closed.
[0060] 7, for the control unit 100 located to the left of the manual feed unit 235, the upstream side of the sheet feed direction of the manual feed unit 235 (upper side in FIG. 7) is arranged as a movable area 15B for fan motor 15b that moves together with side regulating plate 14b, and the downstream side of the sheet feed direction of the manual feed unit 235 (lower side in FIG. 7) is arranged as a movable area 15A for fan motor 15a that moves together with side regulating plate 14b, and the pull-out direction of the bundled wires and the wiring positions are all arranged to be opposite to the configuration in FIG. 6.
[0061] Even in the configuration of Figure 7, the length of the bundled wires from the fan motor 15a and the sheet detection sensor 505a to the control unit 100 located on the left side can be optimized without having to detour around the opposite side of the control unit 100 to avoid the risk of wire breakage as in the comparative example of Figure 5. [Explanation of symbols]
[0062] 14a, 14b...Side control plate 15a, 15b...Fan motor 505a, 505b...Sheet detection sensor 51…Bundled wire 100...Control unit 200...Image forming apparatus 235...Manual feed section
Claims
1. The main body of the device, The main body of the apparatus includes an image forming unit that forms an image on a sheet, A tray is provided on the side of the main body of the device on which a sheet is placed, A feeding unit capable of feeding the sheet placed on the tray toward the image forming unit, A first side restricting portion is movable in the sheet width direction perpendicular to the sheet feeding direction of the tray and restricts one end of the sheet in the sheet width direction, The tray is movable in the sheet width direction and has a second side restricting portion that restricts the other end of the sheet in the sheet width direction, Together with the first side restricting section, a first fan is provided which is movable in a first region in the width direction of the sheet and blows air onto the sheet placed on the tray, A second fan is provided downstream of the first fan in the sheet feeding direction, and together with the second side restricting section, is movable in a second region different from the first region in the sheet width direction, and blows air onto the sheet placed on the tray. A control unit is provided on the main body of the device, located closer to the first region than the second region in the sheet width direction, and controls the first fan and the second fan. A first bundle section is drawn out from the first fan in the sheet feeding direction so as to overlap with the first region in the sheet width direction, passes outside the second region of the second fan in the sheet width direction, and is connected to the control unit, An image forming apparatus characterized by having the following features.
2. A sheet detection sensor is provided in the tray for detecting the sheet, A sheet detection sensor bundle is drawn out from the sheet detection sensor in the sheet feeding direction so as to overlap with the first region in the sheet width direction, passes outside the second region of the second fan in the sheet width direction, and is connected to the control unit. The image forming apparatus according to claim 1, characterized by having the following features.
3. The sheet detection sensor is provided between the first fan and the second fan in the sheet feeding direction. The image forming apparatus according to feature 2.
4. The second wire bundle is drawn out from the second fan in the sheet feeding direction so as to overlap with the two regions in the sheet width direction, and is connected to the first wire bundle at a position overlapping with the first region of the first fan in the sheet width direction, The image forming apparatus according to feature 1.
5. When the first side restrictor and the second side restrictor are moved to the innermost position in the width direction, the first fan and the second fan overlap in the width direction. The image forming apparatus according to feature 1.
6. The control unit is located closer to the second fan than to the first fan in the sheet feeding direction. The image forming apparatus according to feature 1.