Image forming apparatus

Abstract

To provide an image forming apparatus that can facilitate operations to replace a filter.SOLUTION: An image forming apparatus 1 comprises: a housing 2 including a right side wall 23 that is formed with a first exhaust port 23a and a second exhaust port 23b, and projecting walls 240, 250 that are arranged in the first exhaust port 23a and the second exhaust port 23b and project from the right side wall 23; an attachment frame 75 that is arranged to surround the first exhaust port 23a and the second exhaust port 23b, and is attached to the housing 2; and a holder 76 that is removably attached to the attachment frame 75, and configured to hold a first filter 73 and a second filter 74 removing substances exhausted through the first exhaust port 23a and the second exhaust port 23b.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an image forming apparatus. [Background technology]

[0002] Conventionally, there has been known an image forming device that includes a housing having an exhaust port for discharging air from inside the device, a protruding wall provided at the exhaust port and protruding from the housing, and a filter for removing dust from the exhaust air discharged through the exhaust port.

[0003] For example, the image forming apparatus described in Patent Document 1 includes an exhaust frame 5 which is a protruding wall provided at an exhaust port 3C of a housing 3, a filter frame 12 which is attached to the housing 3 and covers the outer periphery of the exhaust frame 5, a filter 9 inserted into the filter frame 12, and a pressing portion 13 which presses the filter 9 towards the housing 3.

[0004] The filter 9 can be held by the filter frame 12 by being pressed by the pressing portion 13 after being inserted into the filter frame 12 in a state where the filter 9 is attached to the housing 3 . [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-161911 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, because filter frame 12 was not configured to hold filter 9 before it was attached to housing 3, it was difficult to attach filter frame 12 to housing 3 while filter 9 was being held in filter frame 12, making the task of replacing filter 9 cumbersome.

[0007] Therefore, the present invention provides an image forming apparatus that allows easy filter replacement. [Means for solving the problem]

[0008] The image forming apparatus that solves the above problem has the following features.

[0009] That is, the image forming apparatus comprises a housing having a side wall in which an exhaust port is formed, and a protruding wall disposed at the exhaust port and protruding from the side wall, a mounting frame disposed to surround the exhaust port and attached to the housing, and a holder that is detachable from the mounting frame and configured to hold a filter that removes substances discharged through the exhaust port.

[0010] This allows the holder to be attached to and detached from the mounting frame while holding the filter, facilitating the work of replacing the filter.

[0011] The holder also has a peripheral wall in which an opening for attaching the filter is formed, and the peripheral wall has a rib protruding into the opening.

[0012] As a result, the filter housed inside the holder is prevented from falling out of the holder by being engaged with the ribs, and the holder can stably hold the filter.

[0013] The mounting frame also has an inner peripheral surface that is guided by the outer peripheral surface of the protruding wall.

[0014] This makes it possible to easily position the mounting frame relative to the exhaust port without providing a separate positioning member on the mounting frame.

[0015] Further, the exhaust port includes a first exhaust port and a second exhaust port arranged alongside the first exhaust port, the protruding wall includes a first protruding wall arranged at the first exhaust port and a second protruding wall arranged at the second exhaust port, and the mounting frame includes a first mounting frame arranged to surround the first exhaust port, a second mounting frame arranged to surround the second exhaust port, and a connecting portion connecting the first mounting frame and the second mounting frame.

[0016] As a result, even if the exhaust port has a first exhaust port and a second exhaust port, the holder that integrally covers the first exhaust port and the second exhaust port can be attached by a single mounting frame.

[0017] Further, the holder is composed of a first holder that integrally covers the first exhaust port and the second exhaust port, or is composed of a second holder that covers the first exhaust port and a third holder that is formed separately from the second holder and covers the second exhaust port, and the mounting frame has a first engagement groove that can engage with the first holder, a second engagement groove that can engage with the second holder, and a third engagement groove that can engage with the third holder.

[0018] This allows the first holder and the second and third holders to be attached to the same mounting frame in both cases where the first exhaust port and the second exhaust port are covered by the first holder and where they are covered by the second holder and the third holder.

[0019] The first holder further comprises first holder side louvers arranged opposite the first exhaust port, guiding the air discharged from the first exhaust port and bending from the upstream side to the downstream side in the air discharge direction, and second holder side louvers arranged opposite the second exhaust port, guiding the air discharged from the second exhaust port and bending from the upstream side to the downstream side in the air discharge direction, and the bending direction of the first holder side louvers is different from the air bending direction of the second holder side louvers.

[0020] This allows the air discharged from the first exhaust port and the air discharged from the second exhaust port to be discharged in appropriate directions.

[0021] In addition, the second holder is arranged opposite the first exhaust port, guides the air discharged from the first exhaust port, and is provided with a third holder side louver bent from the upstream side to the downstream side in the air discharge direction, and the third holder is arranged opposite the second exhaust port, guides the air discharged from the second exhaust port, and is provided with a fourth holder side louver bent from the upstream side to the downstream side in the air discharge direction, and the bending direction of the third holder side louver is different from the bending direction of the fourth holder side louver.

[0022] This allows the air discharged from the first exhaust port and the air discharged from the second exhaust port to be discharged in appropriate directions.

[0023] Further, the second engagement groove is formed in the first mounting frame, the third engagement groove is formed in the second mounting frame, and the position at which the third engagement groove is formed in the second mounting frame is different from the position at which the second engagement groove is formed in the first mounting frame.

[0024] This makes it possible to prevent the second holder from being erroneously attached to the second mounting frame, and the third holder from being erroneously attached to the first mounting frame.

[0025] Further, an adhesive layer having elasticity and bonding the side wall and the mounting frame is provided between the side wall and the mounting frame.

[0026] This allows the adhesive layer to fill the gap between the mounting frame attached to the side wall and the side wall.

[0027] The adhesive layer is disposed on two sides of the mounting frame which is formed in a rectangular shape.

[0028] This allows the mounting frame to be easily attached to the side wall.

[0029] The adhesive layer is disposed on the four sides of the mounting frame which is formed in a rectangular shape.

[0030] This can increase the adhesive strength of the mounting frame to the housing.

[0031] The adhesive layer is disposed over the entire periphery of the mounting frame.

[0032] This can increase the adhesive strength of the mounting frame to the housing.

[0033] The holder is attached to the mounting frame by sliding relative to the mounting frame in a direction perpendicular to the mounting direction of the mounting frame relative to the housing.

[0034] This makes it possible to easily attach the holder to the mounting frame even when there is little space in the mounting direction of the mounting frame relative to the side wall of the housing.

[0035] The orthogonal direction is the front-rear direction of the housing, and the holder is attached to the mounting frame by sliding from the front to the rear of the housing.

[0036] This makes it easier to attach the holder to the mounting frame.

[0037] In addition, one of the holder and the mounting frame has a groove extending in the sliding direction of the holder, and the other of the holder and the mounting frame has a protrusion that engages with the groove.

[0038] This allows the holder to be easily and slidably attached to the mounting frame.

[0039] The holder also includes a fixed holder attached to the mounting frame, and a rotating holder rotatably supported by the fixed holder.

[0040] This allows the filter to be replaced with the holder attached to the mounting frame by rotating the rotating holder relative to the fixed holder, making it possible to easily replace the filter.

[0041] The rotating holder further includes a side wall that holds the filter, and the side wall includes a notch formed by cutting out a portion of the side wall.

[0042] This allows the portion of the filter held by the rotatable holder that is exposed through the notch to be pinched and easily removed from the rotatable holder, making it easy to replace the filter.

[0043] Moreover, the mounting frame has a circular outer shape, and the holder attached to the mounting frame is movable in a circumferential direction relative to the mounting frame.

[0044] With this, in the case where louvers are formed on the holder, the guide direction of the air discharged from the exhaust port can be adjusted by moving the holder in the circumferential direction.

[0045] In addition, the mounting frame has a slide groove formed along the circumferential direction and a through groove that penetrates in the mounting direction of the mounting frame, and the holder has a rib that can pass through the through groove, and the rib that passes through the through groove can move along the slide groove.

[0046] This means that after the ribs of the holder have passed through the through grooves of the mounting frame, the holder can be moved in a circumferential direction to prevent the ribs from coming out of the through grooves, making it easy to attach the holder to the mounting frame.

[0047] The mounting frame also includes a stopper that protrudes from the slide groove and abuts against the rib of the holder to restrict circumferential movement of the holder.

[0048] This makes it possible to stop the holder moving in the circumferential direction at a phase where the rib and the stopper come into contact with each other.

[0049] In addition, the holder is located at an end portion away from the exhaust port in the mounting direction of the mounting frame, and has an outer surface with an opening, the diameter of the opening on the outer surface being larger than the diameter of the exhaust port.

[0050] This allows the exhaust gas discharged through the exhaust port to be discharged from the outer surface of the holder without leakage and with low resistance.

[0051] The holder also includes a lower holder facing the exhaust port and having a first louver, and an upper holder located on the opposite side of the lower holder from the exhaust port and having a second louver, and the filter is located between the lower holder and the upper holder.

[0052] This allows the user to replace the filter without touching it. Effect of the Invention

[0053] According to the present invention, the filter replacement operation can be facilitated. [Brief description of the drawings]

[0054] [Figure 1] FIG. 2 is a central cross-sectional view showing the image forming apparatus. [Diagram 2] FIG. 1 is a perspective view showing an image forming apparatus. [Diagram 3] 2 is an exploded perspective view showing a mounting frame, a filter, and a holder attached to a right wall of the housing. FIG. [Figure 4] 4 is a rear cross-sectional view showing the mounting frame, the filter, and the holder attached to the side wall of the housing. FIG. [Diagram 5] FIG. 4 is a perspective view showing a mounting frame and an adhesive material. [Figure 6] A rear cross-sectional view showing how the inner surfaces of the first mounting frame and the second mounting frame are guided by the outer surfaces of the first protruding wall and the second protruding wall when the first mounting frame and the second mounting frame are attached to the right side wall. [Figure 7] 4 is a rear cross-sectional view showing the first mounting frame and the second mounting frame attached to the right wall. FIG. [Figure 8] FIG. 11 is a perspective view showing an adhesive material according to a second embodiment. [Figure 9] FIG. 11 is a perspective view showing an adhesive material according to a third embodiment. [Figure 10] FIG. [Figure 11] FIG. 4 is a perspective view showing a first elastic member and a second elastic member. [Figure 12] FIG. 11 is a perspective view showing a mounting frame according to a second embodiment. [Figure 13] FIG. 13(a) is a perspective view showing a holder according to a second embodiment, and (b) is a rear view showing a mounting frame according to the second embodiment. [Figure 14] 2 is an exploded perspective view showing a holder attached to a first mounting frame and a holder attached to a second mounting frame. FIG. [Figure 15] FIG. 2(a) is a perspective view showing a holder attached to a first mounting frame, and (b) is a perspective view showing a holder attached to a second mounting frame. [Figure 16] 11 is a rear view showing a holder attached to the first mounting frame and a holder attached to the second mounting frame. FIG. [Figure 17] FIG. 11 is a perspective view showing an image forming apparatus according to a second embodiment. [Figure 18] 13 is an exploded perspective view showing a mounting frame and a holder attached to the right side wall of a housing in an image forming apparatus according to a second embodiment. FIG. [Figure 19] 13 is a rear view showing a mounting frame and a holder attached to the right side wall of the housing in the image forming apparatus according to the second embodiment. FIG. [Figure 20] 1A is an oblique view showing a mounting frame attached to the right side wall of a housing in an image forming apparatus according to a second embodiment, and FIG. 1B is an oblique view showing a holder attached to the right side wall of a housing in an image forming apparatus according to the second embodiment. [Figure 21]10A is a perspective view showing an open state of a rotating holder of a holder attached to the right side wall of a housing in an image forming apparatus according to a second embodiment, and FIG. 10B is a perspective view showing a state in which a flat rotating holder is holding a filter. [Figure 22] FIG. 11 is a perspective view showing an image forming apparatus according to a third embodiment. [Diagram 23] 13 is an exploded perspective view showing a mounting frame, a filter, and a holder that are attached to the right side wall of a housing of an image forming apparatus according to a third embodiment. FIG. [Figure 24] 13 is a rear view showing the size of a diameter R2 of the opening on the right side of the holder and a diameter R1 of the exhaust port. FIG. [Diagram 25] 13 is an exploded perspective view showing an adhesive, a mounting frame, and a holder attached to the right side wall of a housing of an image forming apparatus according to a third embodiment. FIG. [Figure 26] (a) is a side view showing a holder in which the air guide direction by the holder side louvers is adjusted to be approximately forward when viewed from the left and right direction, (b) is a side view showing a holder in which the air guide direction by the holder side louvers is adjusted to be rear and upward when viewed from the left and right direction, and (c) is a side view showing a holder in which the air guide direction by the holder side louvers is adjusted to be upward when viewed from the left and right direction. [Figure 27] FIG. 13 is a perspective view showing a holder according to a fourth embodiment. [Figure 28] FIG. 13 is a front view showing a holder according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0055] Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0056] [Image forming device] An image forming apparatus 1 shown in FIGS. 1 and 2 is one embodiment of the image forming apparatus according to the present invention, and is a color laser printer that forms a multi-color image on a sheet S by electrophotography.

[0057] In the following description, the left side in Fig. 1 is defined as the front side of the image forming apparatus 1, the right side in Fig. 1 is defined as the rear side of the image forming apparatus 1, the front side of the paper in Fig. 1 is defined as the right side of the image forming apparatus 1, and the back side of the paper in Fig. 1 is defined as the left side of the image forming apparatus 1. In addition, the upper and lower sides in Fig. 1 are defined as the upper and lower sides of the image forming apparatus 1, respectively.

[0058] The image forming device 1 includes a housing 2, a paper feed section 3 having a paper feed tray 10 that supports sheets S and a sheet transport section 30 that transports the sheets S, and an image forming section 5 that forms an image on the sheets S transported by the paper feed section 3.

[0059] The housing 2 is formed in a substantially rectangular parallelepiped shape and houses the paper feed unit 3 and the image forming unit 5. A front opening 2A is formed in the front of the housing 2, and the housing 2 is provided with a front cover 21 that can open and close the front opening 2A.

[0060] The front cover 21 is configured to be rotatable about a rotation shaft 21a at the lower end, and by rotating about the rotation shaft 21a, the front cover 21 can move between a closed position where the front opening 2A is closed and an open position where the front opening 2A is opened. A paper discharge tray 22 is formed on the upper surface of the housing 2, which is inclined downward from the front side to the rear side.

[0061] The paper feed unit 3 is disposed at the bottom of the housing 2, and conveys the sheet S supported on the paper feed tray 10 to the image forming unit 5 by the sheet conveying unit 30. The paper feed tray 10 is configured to be slidable in the front-rear direction, and is configured to be movable between a storage position where it is stored in the housing 2 and a separation position where it is pulled out forward from the storage position.

[0062] The sheet conveying section 30 includes a paper feed roller 32, a separation roller 33, a separation pad 33a, a conveying roller pair 34, and a registration roller pair 35. A conveying path P for the sheet S is formed in the housing 2, which extends from the paper feed tray 10 to the paper discharge tray 22 via the image forming section 5.

[0063] The sheets S supported by the paper feed tray 10 are separated one by one by the paper feed roller 32, the separation roller 33, and the separation pad 33a, and sent out to a transport path P. The paper feed roller 32 is a roller that transports the sheets S from the paper feed tray 10 toward the image forming unit 5. The separation roller 33 and the separation pad 33a constitute a separation means that separates the sheets S supported by the paper feed tray 10 one by one.

[0064] The sheet S sent to the conveying path P is conveyed toward the image forming unit 5 by a conveying roller pair 34 and a registration roller pair 35. The registration roller pair 35 regulates the movement of the leading edge of the conveyed sheet S, temporarily stops the sheet S, and then conveys the sheet S toward the image forming unit 5 at a predetermined timing.

[0065] The image forming unit 5 is disposed above the paper feeding unit 3, and includes four toner cartridges 50 arranged side by side in the front-rear direction, and a photosensitive drum 51 corresponding to each toner cartridge 50. The toner cartridges 50 are provided corresponding to the colors black, yellow, magenta, and cyan. The toner cartridges 50 are detachably supported by a drawer 59. The drawer 59 can be attached to and detached from the housing 2 through a front opening 2A of the housing 2 by opening the front cover 21. The toner cartridges 50 include a developing roller 52.

[0066] The photosensitive drum 51 is formed in a generally cylindrical shape with its axis extending in the left-right direction, and is rotatably supported by a drawer 59. The developing roller 52 extends in the left-right direction, and is rotatably supported by a toner cartridge 50. Toner is an example of a developer. The developing roller 52 supplies toner to the photosensitive drum 51.

[0067] The housing 2 includes an exposure device 56 that exposes the surfaces of the photosensitive drums 51. The exposure device 56 includes a laser diode, a polarizer, a lens, and a mirror (not shown). The exposure device 56 is configured to emit a light beam to each photosensitive drum 51 to expose the surface of each photosensitive drum 51.

[0068] A transfer belt 41 is disposed below the photosensitive drum 51 across the transport path P. The transfer belt 41 is in contact with the photosensitive drum 51. The transfer belt 41 is stretched between a drive roller 42 and a driven roller 43 disposed in front of the drive roller 42. A transfer roller 44 is disposed at a position facing each photosensitive drum 51 across the transfer belt 41. In the image forming unit 5, a belt device 40 is configured by the transfer belt 41, the drive roller 42, the driven roller 43, the transfer roller 44, etc.

[0069] The image forming unit 5 includes a charger 54 for charging each photosensitive drum 51. The charger 54 is supported by a drawer 59. The photosensitive drums 51 uniformly charged by the charger 54 are selectively exposed to light by an exposure device 56. This exposure selectively removes charge from the surface of the photosensitive drum 51, and an electrostatic latent image is formed on the surface of the photosensitive drum 51.

[0070] The toner contained in the toner cartridge 50 is positively charged and carried on the surface of the developing roller 52. A developing bias is applied to the developing roller 52, and when the electrostatic latent image formed on the photosensitive drum 51 faces the developing roller 52, toner is supplied from the developing roller 52 to the electrostatic latent image due to the potential difference between the electrostatic latent image and the developing roller 52. As a result, a toner image is formed on the surface of the photosensitive drum 51.

[0071] When the sheet S transported toward the image forming unit 5 reaches the transfer belt 41, it is transported by the transfer belt 41 and passes sequentially between the transfer belt 41 and each photosensitive drum 51. Then, the toner image carried on the surface of the photosensitive drum 51 is transferred onto the sheet S by a transfer bias applied to the transfer roller 44 when it faces the sheet S.

[0072] In this embodiment, the transfer belt 41 is configured as a conveying belt that conveys the sheet S onto which the toner image is transferred, but it is also possible to configure it as an intermediate transfer belt in which the toner image is transferred to the belt itself and the toner image transferred to the belt is further transferred to the sheet S.

[0073] The sheet S onto which the toner image has been transferred is transported to a fixing device 60. The fixing device 60 includes a heating roller 61 and a pressure roller 62 that is in pressure contact with the heating roller 61, and the toner image on the sheet S transported to the fixing device 60 is thermally fixed while the sheet S passes between the heating roller 61 and the pressure roller 62. In other words, the fixing device 60 fixes the toner image on the sheet S.

[0074] The sheet S on which the toner image has been thermally fixed is transported downstream in the transport direction from the fixing device 60, and further transported by a pair of intermediate discharge rollers 63 and a pair of discharge rollers 64 arranged downstream in the transport direction of the pair of intermediate discharge rollers 63, and discharged onto the discharge tray 22.

[0075] In the image forming apparatus 1, a process unit PU that forms a toner image on a sheet S is configured by a drawer 59, a toner cartridge 50 supported by the drawer 59, a photosensitive drum 51, a charger 54, etc. Note that the process unit PU is only required to include at least the photosensitive drum 51 and the charger 54, and may also include a transfer belt 41 or a fixing unit 60.

[0076] The image forming apparatus 1 includes a power supply board 11 on which a power supply circuit is formed, and a board cover 12 that covers the power supply board 11. The board cover 12 is disposed between the paper feed tray 10 and the belt device 40 at the rear of the housing 2. The housing 2 houses the process unit PU and the board cover 12.

[0077] The image forming apparatus 1 includes a first fan 71 and a second fan 72 that exhaust the air inside the housing 2 to the outside of the housing 2. The first fan 71 is disposed to the right and rear of the process unit PU inside the housing 2, and is configured to exhaust the air inside the process unit PU inside the housing 2 to the outside of the housing 2.

[0078] The second fan 72 is disposed to the right of the board cover 12 inside the housing 2 and at a position where a plane of projection of the second fan 72 toward the board cover 12 in the left-right direction overlaps with the rear part of the board cover 12, and is configured to exhaust the air within the board cover 12 inside the housing 2 to the outside of the housing 2. The second fan 72 is disposed below the first fan 71.

[0079] 2 and 3, a right frame 26 is housed in the right end portion inside the housing 2, and the housing 2 has a right side wall 23 that covers the right side of the right frame 26. The right side wall 23 of the housing 2 has a first exhaust port 23a and a second exhaust port 23b that penetrate the right side wall 23 in the left-right direction.

[0080] The second exhaust port 23b is arranged next to the first exhaust port 23a in the up-down direction. The first exhaust port 23a and the second exhaust port 23b are located at the rear of the right side wall 23, and the first exhaust port 23a is located above the second exhaust port 23b. The first exhaust port 23a and the second exhaust port 23b are one example of an exhaust port, and the right side wall 23 is one example of a side wall in which an exhaust port is formed.

[0081] 3 and 4, the housing 2 includes a first main body louver 24 disposed at the first exhaust port 23a. The first main body louver 24 is an example of a main body louver. The first main body louver 24 is located to the right of the first fan 71.

[0082] The first main body louver 24 is formed in a rectangular shape along the periphery of the first exhaust port 23a, and includes a first protruding wall 240 protruding rightward from the outer surface of the right side wall 23, and a first slat 241 extending in the front-rear direction within an area surrounded by the first protruding wall 240. The first protruding wall 240 is disposed at the exhaust port, and is an example of a protruding wall protruding from the side wall. A plurality of first slats 241 are disposed at intervals in the up-down direction. The first protruding wall 240 includes a front outer peripheral surface 240a, a rear outer peripheral surface 240b, an upper outer peripheral surface 240c, and a lower outer peripheral surface 240d.

[0083] In this embodiment, the first main body louver 24 is formed by being integrally molded with the right side wall 23, but the first main body louver 24 may be configured to be detachably attached to the right side wall 23.

[0084] The housing 2 includes a second main body louver 25 disposed at the second exhaust port 23b. The second main body louver 25 is an example of a main body louver. The second main body louver 25 is located to the right of the second fan 72.

[0085] The second main body louver 25 is formed in a rectangular shape along the periphery of the second exhaust port 23b, and includes a second protruding wall 250 protruding rightward from the outer surface of the right side wall 23, and a second slat 251 extending in the front-rear direction within the range surrounded by the second protruding wall 250. The second protruding wall 250 is an example of a protruding wall disposed at the exhaust port and protruding from the side wall. A plurality of second slats 251 are disposed at intervals in the up-down direction. The second protruding wall 250 includes a front outer peripheral surface 250a, a rear outer peripheral surface 250b, an upper outer peripheral surface 250c, and a lower outer peripheral surface 250d.

[0086] In this embodiment, the second main body louver 25 is formed by being integrally molded with the right side wall 23, but the second main body louver 25 may be configured to be detachably attached to the right side wall 23.

[0087] The first fan 71 is supported by the right frame 26, and is disposed at a position where a plane of projection of the first fan 71 onto the right side wall 23 in the left-right direction overlaps with the first exhaust port 23a. Driving the first fan 71 generates an airflow from left to right, and the airflow created by the first fan 71 exhausts the air inside the process unit PU to the outside of the housing 2 through the first main body louvers 24 disposed at the first exhaust port 23a.

[0088] When the air inside the process unit PU is exhausted to the outside of the housing 2 through the first exhaust port 23a, substances such as ozone and toner present inside the housing 2 are exhausted to the outside of the housing 2 together with the air.

[0089] The second fan 72 is supported by the right frame 26, and is disposed at a position where a plane of projection of the second fan 72 toward the right side wall 23 in the left-right direction overlaps with the second exhaust port 23b. When the second fan 72 is driven, an airflow is generated in a direction from left to right, and the airflow generated by the second fan 72 exhausts the air inside the board cover 12 to the outside of the housing 2 through the second main body louvers 25 disposed at the second exhaust port 23b.

[0090] When the air inside the board cover 12 is exhausted to the outside of the housing 2 through the second exhaust port 23b, substances such as ozone and toner present inside the housing 2 are exhausted to the outside of the housing 2 together with the air.

[0091] [Filter, mounting frame, holder] As shown in FIGS. 2 to 4, the image forming apparatus 1 includes a first filter 73, a second filter 74, a mounting frame 75, a holder 76, an adhesive material 81, and an elastic member 82. As shown in FIG.

[0092] (filter) The first filter 73 is a filter that removes substances such as ozone and toner discharged through the first exhaust port 23a. The second filter 74 is a filter that removes substances such as ozone and toner discharged through the second exhaust port 23b. The first filter 73 and the second filter 74 are examples of filters that remove substances discharged through an exhaust port.

[0093] (Mounting frame) The mounting frame 75 is disposed so as to surround the first exhaust port 23a and the second exhaust port 23b, and is attached to the right side wall 23 of the housing 2.

[0094] As shown in FIGS. 3 to 5, the mounting frame 75 includes a first mounting frame 751, a second mounting frame 752, and a connecting portion 753.

[0095] The first mounting frame 751 is formed in a rectangular shape and is disposed so as to surround the first exhaust port 23a. The first mounting frame 751 includes a front frame 7511 extending in the up-down direction, a rear frame 7512 extending in the up-down direction behind the front frame 7511, an upper frame 7513 extending in the front-rear direction and connecting an upper end of the front frame 7511 to an upper end of the rear frame 7512, and a lower frame 7514 extending in the front-rear direction and connecting a lower end of the front frame 7511 to a lower end of the rear frame 7512.

[0096] The front frame 7511 is located in front of the front outer peripheral surface 240a of the first protruding wall 240, the rear frame 7512 is located behind the rear outer peripheral surface 240b of the first protruding wall 240, the upper frame 7513 is located above the upper outer peripheral surface 240c of the first protruding wall 240, and the lower frame 7514 is located below the lower outer peripheral surface 240d of the first protruding wall 240.

[0097] In the first mounting frame 751 of the mounting frame 75 attached to the right side wall 23, the inner surface 7511a of the front frame 7511 is guided by the front outer peripheral surface 240a, the inner surface 7512a of the rear frame 7512 is guided by the rear outer peripheral surface 240b, the inner surface 7513a of the upper frame 7513 is guided by the upper outer peripheral surface 240c, and the inner surface 7514a of the lower frame 7514 is guided by the lower outer peripheral surface 240d.

[0098] In other words, the first mounting frame 751 has inner surfaces 7511a, 7512a, 7513a, and 7514a that are guided by the outer surfaces of the first protruding wall 240, namely, the front outer surface 240a, the rear outer surface 240b, the upper outer surface 240c, and the lower outer surface 240d.

[0099] The second mounting frame 752 is formed in a rectangular shape and is disposed so as to surround the second exhaust port 23b. The second mounting frame 752 includes a front frame 7521 extending in the vertical direction, a rear frame 7522 extending in the vertical direction behind the front frame 7521, an upper frame 7523 extending in the front-rear direction and connecting an upper end of the front frame 7521 to an upper end of the rear frame 7522, and a lower frame 7524 extending in the front-rear direction and connecting a lower end of the front frame 7521 to a lower end of the rear frame 7522.

[0100] The front frame 7521 is located in front of the front outer peripheral surface 250a of the second protruding wall 250, the rear frame 7522 is located behind the rear outer peripheral surface 250b of the second protruding wall 250, the upper frame 7523 is located above the upper outer peripheral surface 250c of the second protruding wall 250, and the lower frame 7524 is located below the lower outer peripheral surface 250d of the second protruding wall 250.

[0101] In the second mounting frame 752 of the mounting frame 75 attached to the right side wall 23, the inner surface 7521a of the front frame 7521 is guided by the front outer peripheral surface 250a, the inner surface 7522a of the rear frame 7522 is guided by the rear outer peripheral surface 250b, the inner surface 7523a of the upper frame 7523 is guided by the upper outer peripheral surface 250c, and the inner surface 7524a of the lower frame 7524 is guided by the lower outer peripheral surface 250d.

[0102] In other words, the second mounting frame 752 has inner circumferential surfaces 7521a, 7522a, 7523a, and 7524a that are guided by the outer circumferential surfaces of the second protruding wall 250, namely, front outer circumferential surface 250a, rear outer circumferential surface 250b, upper outer circumferential surface 250c, and lower outer circumferential surface 250d.

[0103] The connecting portion 753 connects the first mounting frame 751 and the second mounting frame 752. The connecting portion 753 includes a front connecting frame 7531 and a rear connecting frame 7532. The front connecting frame 7531 extends in the vertical direction and connects the front frame 7511 of the first mounting frame 751 and the front frame 7521 of the second mounting frame 752. The rear connecting frame 7532 extends in the vertical direction and connects the rear frame 7512 of the first mounting frame 751 and the rear frame 7522 of the second mounting frame 752.

[0104] As shown in FIG. 6, when attaching the mounting frame 75 to the right side wall 23 of the housing 2, the inner surfaces 7511a, 7512a, 7513a, 7514a of the first mounting frame 751 are aligned with the outer surfaces of the first protruding wall 240, that is, the front outer surface 240a, the rear outer surface 240b, the upper outer surface 240c, and the lower outer surface 240d, and the inner surfaces 7521a, 7522a, 7523a, 7524a of the second mounting frame 752 are aligned with the outer surfaces of the second protruding wall 250, that is, the front outer surface 240a, the rear outer surface 240b, the upper outer surface 240c, and the lower outer surface 240d, while the mounting frame 75 is moved from right to left.

[0105] 7, the first mounting frame 751 and the second mounting frame 752 are fitted into the first protruding wall 240 and the second protruding wall 250 with the inner circumferential surfaces of the first mounting frame 751 and the second mounting frame 752 being guided by the outer circumferential surfaces of the first protruding wall 240 and the second protruding wall 250, and the mounting frame 75 is attached to the right side wall 23. In this way, the mounting frame 75 is attached to the right side wall 23 by moving from right to left, and the mounting direction of the mounting frame 75 with respect to the right side wall 23 is the left-right direction.

[0106] In this way, since the mounting frame 75 has inner surfaces of the first mounting frame 751 and the second mounting frame 752 that are guided by the outer surfaces of the first protruding wall 240 and the second protruding wall 250, it is possible to easily position the mounting frame 75 relative to the first exhaust port 23a and the second exhaust port 23b without providing a separate positioning member on the mounting frame 75.

[0107] (adhesive) 5, the mounting frame 75 attached to the housing 2 is adhered to the right side wall 23 of the housing 2 by an elastic adhesive material 81. The adhesive material 81 is an example of an adhesive layer, and may be formed of, for example, double-sided tape.

[0108] The adhesive material 81 includes a first member 811 and a second member 812 extending in the vertical direction. The first member 811 is attached to the surfaces of the front frame 7511 of the first mounting frame 751, the front connecting frame 7531 of the connecting portion 753, and the front frame 7521 of the second mounting frame 752, which face the right side wall 23.

[0109] The second material 812 is affixed to the surfaces of the rear frame 7512 of the first mounting frame 751, the rear connecting frame 7532 of the connecting portion 753, and the rear frame 7522 of the second mounting frame 752 that face the right side wall 23.

[0110] The mounting frame 75 and the right side wall 23 are bonded together by attaching a first member 811 and a second member 812 of the adhesive 81 attached to the mounting frame 75 to the right side wall 23. When the mounting frame 75 is attached to the right side wall 23, the adhesive 81 is located between the mounting frame 75 and the right side wall 23.

[0111] In this way, by positioning the adhesive 81 between the mounting frame 75 and the right side wall 23, it is possible to fill the gap between the mounting frame 75 attached to the right side wall 23 and the right side wall 23 with the adhesive 81.

[0112] The mounting frame 75 is generally formed into a rectangle by four sides: a front frame 7511, a front connecting frame 7531, and a front frame 7521; a rear frame 7512, a rear connecting frame 7532, and a rear frame 7522; an upper frame 7513; and a lower frame 7524. In the mounting frame 75 formed into a rectangle, the adhesive material 81 is disposed on two sides: a front frame 7511, a front connecting frame 7531, and a front frame 7521; and a rear frame 7512, a rear connecting frame 7532, and a rear frame 7522.

[0113] The first mounting frame 751 is formed into a rectangle with four sides: a front frame 7511, a rear frame 7512, an upper frame 7513, and a lower frame 7514. The adhesive 81 is disposed on two sides of the first mounting frame 751, the front frame 7511 and the rear frame 7512, in the first mounting frame 751 formed into a rectangle.

[0114] The second mounting frame 752 is formed into a rectangle with four sides: a front frame 7521, a rear frame 7522, an upper frame 7523, and a lower frame 7524. The adhesive 81 is disposed on two sides of the front frame 7521 and the rear frame 7522 in the second mounting frame 752 formed into a rectangle.

[0115] In this way, since the adhesive 81 is arranged on two sides of the rectangular mounting frame 75, the first mounting frame 751, and the second mounting frame 752, it is possible to easily attach the mounting frame 75, the first mounting frame 751, and the second mounting frame 752 to the right side wall 23.

[0116] (Second embodiment of adhesive) The adhesive material 81 can also be formed as an adhesive material 81A shown in Fig. 8. The adhesive material 81A is an example of an adhesive layer, and can be formed of, for example, a double-sided tape.

[0117] The adhesive material 81A includes a first material 811A and a second material 812A extending in the up-down direction, and a third material 813A, a fourth material 814A, a fifth material 815A, and a sixth material 816A extending in the front-rear direction.

[0118] The first material 811A is affixed to the surfaces of the front frame 7511 of the first mounting frame 751, the front connecting frame 7531 of the connecting portion 753, and the front frame 7521 of the second mounting frame 752, which face the right side wall 23. The second material 812A is affixed to the surfaces of the rear frame 7512 of the first mounting frame 751, the rear connecting frame 7532 of the connecting portion 753, and the rear frame 7522 of the second mounting frame 752, which face the right side wall 23.

[0119] The third material 813A is affixed to a surface of the upper frame 7513 of the first mounting frame 751 facing the right wall 23. The fourth material 814A is affixed to a surface of the lower frame 7514 of the first mounting frame 751 facing the right wall 23. The fifth material 815A is affixed to a surface of the upper frame 7523 of the second mounting frame 752 facing the right wall 23. The sixth material 816A is affixed to a surface of the lower frame 7524 of the second mounting frame 752 facing the right wall 23.

[0120] In the mounting frame 75 which is formed in a rectangular shape, the adhesive material 81A is arranged on four sides, namely the front frame 7511, the front connecting frame 7531, and the front frame 7521, the rear frame 7512, the rear connecting frame 7532, and the rear frame 7522, the upper frame 7513, and the lower frame 7524.

[0121] In the first mounting frame 751 formed in a rectangle, the adhesive material 81A is disposed on four sides, i.e., the front frame 7511, the rear frame 7512, the upper frame 7513, and the lower frame 7514. In the second mounting frame 752 formed in a rectangle, the adhesive material 81A is disposed on four sides, i.e., the front frame 7521, the rear frame 7522, the upper frame 7523, and the lower frame 7524.

[0122] In this way, adhesive material 81A is arranged on the four sides of mounting frame 75, first mounting frame 751, and second mounting frame 752, which are formed in a rectangular shape, thereby increasing the adhesive strength of mounting frame 75, first mounting frame 751, and second mounting frame 752 to the housing 2.

[0123] (Third embodiment of adhesive) The adhesive material 81 can also be formed as an adhesive material 81B shown in Fig. 9. The adhesive material 81B is an example of an adhesive layer, and can be formed of, for example, a double-sided tape.

[0124] The adhesive material 81B includes a first material 811B and a second material 812B extending in the vertical direction, a third material 813B and a fourth material 814B extending in the front-to-back direction, a fifth material 815B and a sixth material 816B extending in the vertical direction, and a seventh material 817B and an eighth material 818B extending in the front-to-back direction.

[0125] The first material 811B is affixed to a surface of the front frame 7511 of the first mounting frame 751 facing the right side wall 23. The second material 812B is affixed to a surface of the rear frame 7512 of the first mounting frame 751 facing the right side wall 23. The third material 813B is affixed to a surface of the upper frame 7513 of the first mounting frame 751 facing the right side wall 23. The fourth material 814B is affixed to a surface of the lower frame 7514 of the first mounting frame 751 facing the right side wall 23.

[0126] The fifth material 815B is affixed to a surface of the front frame 7521 of the second mounting frame 752 facing the right side wall 23. The sixth material 816B is affixed to a surface of the rear frame 7522 of the second mounting frame 752 facing the right side wall 23. The seventh material 817B is affixed to a surface of the upper frame 7523 of the second mounting frame 752 facing the right side wall 23. The eighth material 818B is affixed to a surface of the lower frame 7524 of the second mounting frame 752 facing the right side wall 23.

[0127] Adhesive material 81B is disposed on four sides of mounting frame 75, which is formed in a rectangular shape, including front frames 7511 and 7521, rear frames 7512 and 7522, upper frame 7513, and lower frame 7524.

[0128] In the first mounting frame 751 formed in a rectangle, the adhesive material 81B is disposed on four sides, i.e., the front frame 7511, the rear frame 7512, the upper frame 7513, and the lower frame 7514. In the second mounting frame 752 formed in a rectangle, the adhesive material 81B is disposed on four sides, i.e., the front frame 7521, the rear frame 7522, the upper frame 7523, and the lower frame 7524.

[0129] In this way, adhesive 81B is arranged on the four sides of mounting frame 75, first mounting frame 751, and second mounting frame 752, which are formed in a rectangular shape, thereby increasing the adhesive strength of mounting frame 75, first mounting frame 751, and second mounting frame 752 to the housing 2.

[0130] (holder) 3, 4, and 10, the holder 76 is detachable from the mounting frame 75 and configured to hold the first filter 73 and the second filter 74. The holder 76 integrally covers the first exhaust port 23a and the second exhaust port 23b. The holder 76 includes an upper holder 761 and a lower holder 762 arranged below the upper holder 761 in line. The upper holder 761 and the lower holder 762 are integrally formed.

[0131] The upper holder 761 is formed in a rectangular parallelepiped shape and houses the first filter 73 therein. The upper holder 761 includes a front peripheral wall 7611, a rear peripheral wall 7612, an upper peripheral wall 7613, a lower peripheral wall 7614, a left peripheral wall 7615, and a right peripheral wall 7616. The first filter 73 housed in the upper holder 761 is surrounded by the front peripheral wall 7611, the rear peripheral wall 7612, the upper peripheral wall 7613, the lower peripheral wall 7614, the left peripheral wall 7615, and the right peripheral wall 7616. The front peripheral wall 7611, the rear peripheral wall 7612, the upper peripheral wall 7613, the lower peripheral wall 7614, the left peripheral wall 7615, and the right peripheral wall 7616 are examples of peripheral walls.

[0132] An opening 7615a for attaching the first filter 73 to the inside of the upper holder 761 is formed in the left peripheral wall 7615. The opening 7615a is formed to allow the first filter 73 to pass through.

[0133] Ribs 7615b protruding toward the opening 7615a are formed on the lower and front ends and the lower and rear ends of the left peripheral wall 7615. The first filter 73 housed inside the upper holder 761 is prevented from falling out of the upper holder 761 by being engaged with the ribs 7615b. This allows the upper holder 761 to stably hold the first filter 73.

[0134] The right peripheral wall 7616 is open, and is provided with upper holder side louvers 7616a made of multiple vanes arranged at intervals in the vertical direction. When the holder 76 is attached to the mounting frame 75, the upper holder 761 covers the first exhaust port 23a, and the upper holder side louvers 7616a are arranged opposite the first exhaust port 23a.

[0135] The upper holder side louvers 7616a guide the air discharged from the first exhaust port 23a, and are bent from the left side, which is the upstream side of the air discharge direction, to the right side, which is the downstream side. In this embodiment, the upper holder side louvers 7616a are inclined upward toward the right side with respect to the horizontal direction, and guide the air discharged to the right from the first exhaust port 23a diagonally upward to the right.

[0136] The lower holder 762 is formed in a rectangular parallelepiped shape and houses therein the second filter 74. The lower holder 762 includes a front peripheral wall 7621, a rear peripheral wall 7622, ​​an upper peripheral wall 7623, a lower peripheral wall 7624, a left peripheral wall 7625, and a right peripheral wall 7626. The second filter 74 housed in the lower holder 762 is surrounded by the front peripheral wall 7621, the rear peripheral wall 7622, ​​the upper peripheral wall 7623, the lower peripheral wall 7624, the left peripheral wall 7625, and the right peripheral wall 7626.

[0137] An opening 7625a for attaching the second filter 74 to the inside of the lower holder 762 is formed in the left peripheral wall 7625. The opening 7625a is formed to allow the second filter 74 to pass through.

[0138] Ribs 7625b protruding toward the opening 7625a are formed at the lower and front ends and the lower and rear ends of the left peripheral wall 7625. The second filter 74 housed inside the lower holder 762 is prevented from falling out of the lower holder 762 by being engaged with the ribs 7625b. This allows the lower holder 762 to stably hold the second filter 74.

[0139] The right peripheral wall 7626 is open, and is provided with a lower-holder-side louver 7626a made of a plurality of vanes arranged at intervals in the vertical direction. When the holder 76 is attached to the mounting frame 75, the lower holder 762 covers the second exhaust port 23b, and the lower-holder-side louver 7626a is arranged opposite the second exhaust port 23b.

[0140] The lower holder side louvers 7626a guide the air discharged from the second exhaust port 23b, and are bent from the left side, which is the upstream side of the air discharge direction, to the right side, which is the downstream side. In this embodiment, the lower holder side louvers 7626a are inclined downward toward the right side with respect to the horizontal direction, and guide the air discharged to the right from the second exhaust port 23b diagonally downward to the right.

[0141] Holder 76 is an example of a first holder that integrally covers the first exhaust port and the second exhaust port. Upper holder side louvers 7616a are an example of a first holder side louver that is disposed opposite the first exhaust port, and lower holder side louvers 7626a are an example of a second holder side louver that is disposed opposite the second exhaust port.

[0142] In the holder 76, the upper holder side louvers 7616a are inclined so that their upper ends are located to the right of their lower ends, and are bent from the upstream side to the downstream side in the air exhaust direction, so as to guide the air exhausted from the first exhaust port 23a diagonally upward to the right. The lower holder side louvers 7626a are inclined so that their lower ends are located to the right of their upper ends, and are bent from the upstream side to the downstream side in the air exhaust direction, so as to guide the air exhausted from the second exhaust port 23b diagonally downward to the right.

[0143] In this way, the bending direction of the upper holder side louvers 7616a and the bending direction of the lower holder side louvers 7626a are different, and the air guided by the upper holder side louvers 7616a and the air guided by the lower holder side louvers 7626a are guided in different directions. This makes it possible to exhaust the air exhausted from the first exhaust port 23a and the air exhausted from the second exhaust port 23b in the appropriate directions.

[0144] Holder 76 is provided with upper engagement claw 763 located at the upper end of holder 76 and engageable with mounting frame 75, and lower engagement claw 764 located at the lower end of holder 76 and engageable with mounting frame 75. Upper engagement claw 763 is formed at one location at the upper end of holder 76, and lower engagement claw 764 is formed at two locations at the lower end of holder 76.

[0145] 5, the mounting frame 75 has an engagement groove 754 engageable with the upper engagement claw 763, and an engagement groove 757 engageable with the lower engagement claw 764. The engagement groove 754 is formed in an upper frame 7513 of the mounting frame 75. The engagement groove 754 is formed in one location of the upper frame 7513 to match the location where the upper engagement claw 763 is formed. The engagement groove 757 is formed in a lower frame 7524 of the mounting frame 75. The engagement groove 757 is formed in two locations of the lower frame 7524 to match the location where the lower engagement claw 764 is formed. The engagement groove 754 and the engagement groove 757 are an example of a first engagement groove engageable with a first holder.

[0146] Holder 76 can be attached to mounting frame 75 by engaging upper engagement claw 763 with engagement groove 754 and lower engagement claw 764 with engagement groove 757 .

[0147] In this case, the housing 2 has a first exhaust port 23a and a second exhaust port 23b as exhaust ports, and the mounting frame 75 has a first mounting frame 751 and a second mounting frame 752 which are integrally connected by a connecting portion 753, so that a holder 76 which integrally covers the first exhaust port 23a and the second exhaust port 23b can be attached to a single mounting frame 75.

[0148] In addition, since holder 76 is configured to hold first filter 73 with upper holder 761 and second filter 74 with lower holder 762, holder 76 can be attached to and detached from mounting frame 75 while holding first filter 73 and second filter 74, making it easy to replace first filter 73 and second filter 74.

[0149] (Elastic material) 4 and 11, an elastic member 82 made of rubber, urethane resin, or the like is positioned between the mounting frame 75 and the holder 76. The elastic member 82 includes a first elastic member 821 positioned between the first mounting frame 751 and the holder 76, and a second elastic member 822 positioned between the second mounting frame 752 and the holder 76.

[0150] The first elastic member 821 is disposed at a position corresponding to the front frame 7511, the rear frame 7512, the upper frame 7513, and the lower frame 7514 of the first mounting frame 751. The second elastic member 822 is disposed at a position corresponding to the front frame 7521, the rear frame 7522, the upper frame 7523, and the lower frame 7524 of the second mounting frame 752.

[0151] By positioning the elastic member 82 between the mounting frame 75 and the holder 76, it is possible to fill the gap between the mounting frame 75 and the holder 76 attached to the mounting frame 75.

[0152] (Second embodiment of mounting frame and holder) Mounting frame 75 and holder 76 can also be configured as mounting frame 75A and holder 76A shown in Figures 12 and 13. Mounting frame 75A differs from mounting frame 75 in that it has engagement grooves 754A and 757A instead of engagement grooves 754 and 757, and does not have engagement grooves 755 and 756. Other configurations of mounting frame 75A are similar to those of mounting frame 75.

[0153] The engagement groove 754 is formed in a front frame 7511 and a rear frame 7512 of the first mounting frame 751 in the mounting frame 75. The engagement groove 757 is formed in a front frame 7521 and a rear frame 7522 of the second mounting frame 752 in the mounting frame 75. The engagement grooves 754, 757 are inclined downward from the right side to the left side.

[0154] Holder 76A differs from holder 76 in that holder 76A includes upper engagement claw 763A instead of upper engagement claw 763, and lower engagement claw 764A instead of lower engagement claw 764. Other configurations of holder 76A are similar to those of holder 76. Holder 76A is an example of a first holder that integrally covers the first exhaust port and the second exhaust port.

[0155] The upper engagement claws 763A are formed at the upper and front end and the upper and rear end of the holder 76A in accordance with the formation locations of the engagement grooves 754. The upper engagement claws 763A are inclined downward from the right side to the left side and are configured to be able to engage with the engagement grooves 754.

[0156] The lower engagement claws 764 are formed at the lower and front end and the lower and rear end of the holder 76A in accordance with the formation locations of the engagement grooves 757. The lower engagement claws 764 are inclined downward from the right side to the left side and are configured to be able to engage with the engagement grooves 757.

[0157] Holder 76A can be attached to mounting frame 75A by engaging upper engagement claw 763A with engagement groove 754A and lower engagement claw 764A with engagement groove 757A.

[0158] (Third embodiment of the holder) The mounting frame 75 and the holder 76 can also be configured like a holder 77 and a holder 78 shown in FIGS.

[0159] The holder 77 is detachable from the first mounting frame 751 of the mounting frame 75, and is configured to hold the first filter 73. The holder 77 covers the first exhaust port 23a. The holder 77 is an example of a second holder that covers the first exhaust port.

[0160] Holder 77 is formed in a rectangular parallelepiped shape and houses first filter 73 therein. Holder 77 includes a front peripheral wall 771, a rear peripheral wall 772, an upper peripheral wall 773, a lower peripheral wall 774, a left peripheral wall 775, and a right peripheral wall 776. First filter 73 housed in holder 77 is surrounded by front peripheral wall 771, rear peripheral wall 772, upper peripheral wall 773, lower peripheral wall 774, left peripheral wall 775, and right peripheral wall 776.

[0161] An opening 775a for attaching the first filter 73 to the inside of the holder 77 is formed in the left peripheral wall 775. The opening 775a is formed to allow the first filter 73 to pass through.

[0162] Ribs 775b protruding toward opening 775a are formed at the lower and front ends and the lower and rear ends of left peripheral wall 775. First filter 73 housed inside holder 77 is prevented from falling out of holder 77 by being engaged with ribs 775b. This enables holder 77 to stably hold first filter 73.

[0163] The right peripheral wall 776 is open and is provided with holder-side louvers 776a made of a plurality of blades arranged at intervals in the vertical direction. When the holder 77 is attached to the first mounting frame 751, the holder 77 covers the first exhaust port 23a, and the holder-side louvers 776a are arranged opposite the first exhaust port 23a. The holder-side louvers 776a are an example of a third holder-side louver arranged opposite the first exhaust port.

[0164] The holder side louvers 776a guide the air discharged from the first exhaust port 23a, and are bent from the left side, which is the upstream side in the air discharge direction, to the right side, which is the downstream side. In this embodiment, the holder side louvers 776a are inclined upward toward the right side with respect to the horizontal direction, and guide the air discharged to the right from the first exhaust port 23a diagonally upward to the right.

[0165] The holder 78 is detachable from the second mounting frame 752 of the mounting frame 75, and is configured to hold the second filter 74. The holder 78 is formed separately from the holder 77. The holder 78 covers the second exhaust port 23b. The holder 78 is an example of a third holder that covers the second exhaust port.

[0166] Holder 78 is formed in a rectangular parallelepiped shape and houses second filter 74 therein. Holder 78 includes a front peripheral wall 781, a rear peripheral wall 782, an upper peripheral wall 783, a lower peripheral wall 784, a left peripheral wall 785, and a right peripheral wall 786. Second filter 74 housed in holder 78 is surrounded by front peripheral wall 781, rear peripheral wall 782, upper peripheral wall 783, lower peripheral wall 784, left peripheral wall 785, and right peripheral wall 786.

[0167] An opening 785a for attaching the second filter 74 to the inside of the holder 78 is formed in the left peripheral wall 785. The opening 785a is formed to allow the second filter 74 to pass through.

[0168] Ribs 785b protruding toward opening 785a are formed at the lower and front ends and the lower and rear ends of left peripheral wall 785. Second filter 74 housed inside holder 78 is prevented from falling out of holder 78 by being engaged with ribs 785b. This enables holder 78 to stably hold second filter 74.

[0169] The right peripheral wall 786 is open, and is provided with holder-side louvers 786a made of a plurality of vanes arranged at intervals in the vertical direction. When the holder 78 is attached to the second mounting frame 752, the holder 78 covers the second exhaust port 23b, and the holder-side louvers 786a are arranged opposite the second exhaust port 23b. The holder-side louvers 786a are an example of a fourth holder-side louver arranged opposite the second exhaust port.

[0170] The holder side louvers 786a guide the air discharged from the second exhaust port 23b, and are bent from the left side, which is the upstream side of the air discharge direction, to the right side, which is the downstream side. In this embodiment, the holder side louvers 786a are inclined downward toward the right side with respect to the horizontal direction, and guide the air discharged to the right from the second exhaust port 23b diagonally downward to the right.

[0171] In the holder 77, the holder side louvers 776a are inclined so that the upper end is located to the right of the lower end, and are bent from the upstream side to the downstream side in the air exhaust direction, and are configured to guide the air exhausted from the first exhaust port 23a diagonally upward to the right.

[0172] In the holder 78, the holder side louvers 786a are inclined so that their lower ends are positioned to the right of their upper ends, and are bent from the upstream side to the downstream side in the air exhaust direction, and are configured to guide the air exhausted from the second exhaust port 23b diagonally downward to the right.

[0173] In this way, the bending direction of holder side louvers 776a in holder 77 is different from the bending direction of holder side louvers 786a in holder 78, and the air guided by holder side louvers 776a and the air guided by holder side louvers 786a are guided in different directions. This makes it possible for the air discharged from first exhaust port 23a and the air discharged from second exhaust port 23b to be discharged in appropriate directions.

[0174] Holder 77 has upper engagement claw 777 located at the upper end of holder 77 and engageable with first mounting frame 751 of mounting frame 75, and lower engagement claw 778 located at the lower end of holder 77 and engageable with first mounting frame 751 of mounting frame 75. Upper engagement claw 777 is formed at one location at the upper end of holder 77, and lower engagement claw 778 is formed at one location at the lower end of holder 77.

[0175] 5, mounting frame 75 has engagement groove 754 engageable with upper engagement claw 777, and engagement groove 755 engageable with lower engagement claw 778. Engagement groove 754 is formed in upper frame 7513 of first mounting frame 751 of mounting frame 75. Engagement groove 754 is formed in one location of upper frame 7513 in accordance with the location where upper engagement claw 777 is formed.

[0176] The engagement groove 755 is formed in the lower frame 7514 of the first mounting frame 751 of the mounting frame 75. The engagement groove 755 is formed in one location on the lower frame 7514 in accordance with the location where the lower engagement claw 778 is formed. The engagement groove 754 and the engagement groove 755 are an example of a second engagement groove that can engage with the second holder. The engagement groove 754 serves both as a first engagement groove that can engage with the first holder and as a second engagement groove that can engage with the second holder.

[0177] By engaging the upper engagement claws 777 with the engagement grooves 754 and the lower engagement claws 778 with the engagement grooves 755 , the holder 77 can be attached to the first mounting frame 751 of the mounting frame 75 .

[0178] Holder 78 has upper engagement claw 787 located at the upper end of holder 78 and engageable with second mounting frame 752 of mounting frame 75, and lower engagement claw 788 located at the lower end of holder 78 and engageable with second mounting frame 752 of mounting frame 75. Upper engagement claw 787 is formed at one location at the upper end of holder 78, and lower engagement claw 788 is formed at two locations at the lower end of holder 78.

[0179] 5, mounting frame 75 has engagement groove 756 engageable with upper engagement claw 787, and engagement groove 757 engageable with lower engagement claw 788. Engagement groove 756 is formed in upper frame 7523 of second mounting frame 752 of mounting frame 75. Engagement groove 757 is formed in one location of upper frame 7523 in accordance with the location where upper engagement claw 787 is formed.

[0180] The engagement grooves 757 are formed in the lower frame 7524 of the second mounting frame 752 of the mounting frame 75. The engagement grooves 757 are formed in two locations on the lower frame 7524 in accordance with the locations where the lower engagement claws 788 are formed. The engagement grooves 756 and 757 are an example of a third engagement groove that can engage with the third holder. The engagement groove 757 serves both as a first engagement groove that can engage with the first holder and as a third engagement groove that can engage with the third holder.

[0181] By engaging the upper engagement claws 787 with the engagement grooves 756 and by engaging the lower engagement claws 788 with the engagement grooves 757 , the holder 78 can be attached to the second mounting frame 752 of the mounting frame 75 .

[0182] The mounting frame 75 has engagement grooves 754, 757 which are first engagement grooves that can engage with the first holder, engagement grooves 754, 755 which are second engagement grooves that can engage with the second holder, and engagement grooves 756, 757 which are third engagement grooves that can engage with the third holder.

[0183] Therefore, in both cases where the first exhaust port 23a and the second exhaust port 23b are covered by the first holder, holder 76, and where they are covered by the second holder, holder 77, and the third holder, holder 78, it is possible to attach holder 76, holder 77, and holder 78 to the same mounting frame 75.

[0184] In addition, in the mounting frame 75 , the engagement grooves 754 and 755 which are the second engagement grooves are formed in the first mounting frame 751 , and the engagement grooves 756 and 757 which are the third engagement grooves are formed in the second mounting frame 752 .

[0185] In this case, the second engagement groove, engagement groove 755, is formed in one location on the first mounting frame 751, while the third engagement groove, engagement groove 757, is formed in two locations on the second mounting frame 752, and the position at which the third engagement groove is formed on the second mounting frame 752 is different from the position on the second mounting frame 752 that corresponds to the position at which the second engagement groove is formed on the first mounting frame 751.

[0186] This makes it possible to prevent holder 77, which is the second holder, from being erroneously attached to second mounting frame 752, and to prevent holder 78, which is the third holder, from being erroneously attached to first mounting frame 751.

[0187] [Second embodiment of image forming apparatus] The image forming apparatus 1 can be configured as an image forming apparatus 1A shown in Figures 17 and 18. The image forming apparatus 1A includes a housing 102 formed in a substantially rectangular parallelepiped shape.

[0188] Image forming apparatus 1A includes a paper feed tray 10A that can be pulled out forward from the front surface of housing 102, and an operation unit 4 that is located at the front of housing 102 and that can operate image forming apparatus 1 and display the operating status of image forming apparatus 1. A right frame 126 is housed in the right end portion of housing 102, and housing 102 includes a right side wall 123 that covers the right side of right frame 126.

[0189] Image forming apparatus 1A is equipped with a fan 171 that exhausts air inside housing 102 to the outside of housing 102. Fan 171 is supported by right frame 126. Right side wall 123 of housing 102 is equipped with exhaust port 123a that penetrates right side wall 123 in the left-right direction. Exhaust port 123a is located at the rear of right side wall 123. Right side wall 123 is an example of a side wall in which an exhaust port is formed.

[0190] 18 and 19, the housing 102 includes a main body louver 124 disposed at the exhaust port 123a. The main body louver 124 is located to the right of the fan 171.

[0191] The main body louver 124 is formed in a rectangular shape along the periphery of the exhaust port 123a, and includes a protruding wall 1240 that protrudes rightward from the outer surface of the right side wall 123, and a blade 1241 that extends in the front-rear direction within an area surrounded by the protruding wall 1240. A plurality of blades 1241 are arranged at intervals in the up-down direction. The protruding wall 1240 includes a front outer peripheral surface 1240a, a rear outer peripheral surface 1240b, an upper outer peripheral surface 1240c, and a lower outer peripheral surface 1240d.

[0192] In this embodiment, main body louver 124 is formed by being integrally molded with right side wall 123 , but main body louver 124 may be configured to be detachably attached to right side wall 123 .

[0193] Fan 171 is disposed at a position where a plane of projection of fan 171 toward right side wall 123 overlaps with exhaust port 123a in the left-right direction. Driving fan 171 generates an airflow from left to right, and the airflow generated by fan 171 exhausts air inside housing 102 to the outside of housing 102 through main body louver 124 disposed at exhaust port 123a.

[0194] When the air inside the housing 102 is exhausted to the outside of the housing 102 through the exhaust port 123a, substances such as ozone and toner present inside the housing 102 are exhausted to the outside of the housing 102 together with the air.

[0195] As shown in FIGS. 17 to 21, the image forming apparatus 1A includes a filter 173, a mounting frame 85, and a holder 86. The filter 173 is a filter member.

[0196] (filter) The filter 173 is a filter that removes substances such as ozone and toner discharged through the exhaust port 123a. The filter 173 is held by the holder 86 and is located to the right of the main body louver .

[0197] (Mounting frame) The mounting frame 85 is formed in a rectangular shape, disposed so as to surround the exhaust port 123a, and attached to the right side wall 123 of the housing 102. The mounting frame 85 is attached to the right side wall 123 in the left-right direction. The mounting frame 85 includes a front frame 851 extending in the vertical direction, a rear frame 852 extending in the vertical direction behind the front frame 851, an upper frame 853 extending in the front-rear direction and connecting an upper end of the front frame 851 to an upper end of the rear frame 852, and a lower frame 854 extending in the front-rear direction and connecting a lower end of the front frame 851 to a lower end of the rear frame 852.

[0198] The front frame 851 is located in front of the front outer peripheral surface 1240a of the protruding wall 1240, the rear frame 852 is located behind the rear outer peripheral surface 1240b of the protruding wall 1240, the upper frame 853 is located above the upper outer peripheral surface 1240c of the protruding wall 1240, and the lower frame 854 is located below the lower outer peripheral surface 1240d of the protruding wall 1240. A groove 853b extending in the front-rear direction is formed in the upper frame 853 of the mounting frame 85, and a groove 854b extending in the front-rear direction is formed in the lower frame 854.

[0199] In the mounting frame 85 attached to the right side wall 123, the inner surface 851a of the front frame 851 is guided by the front outer peripheral surface 1240a, the inner surface 852a of the rear frame 852 is guided by the rear outer peripheral surface 1240b, the inner surface 853a of the upper frame 853 is guided by the upper outer peripheral surface 1240c, and the inner surface 854a of the lower frame 854 is guided by the lower outer peripheral surface 1240d.

[0200] In other words, the mounting frame 85 has inner peripheral surfaces 851a, 852a, 853a, and 854a that are guided by the outer peripheral surfaces of the protruding wall 1240, namely, front outer peripheral surface 1240a, rear outer peripheral surface 1240b, upper outer peripheral surface 1240c, and lower outer peripheral surface 1240d.

[0201] When mounting frame 85 is attached to right side wall 123 of housing 102, mounting frame 85 is moved from right to left while inner circumferential surfaces 851a, 852a, 853a, 854a are aligned with front outer circumferential surface 1240a, rear outer circumferential surface 1240b, upper outer circumferential surface 1240c, and lower outer circumferential surface 1240d, which are outer circumferential surfaces of protruding wall 1240. As a result, as shown in FIG. 19, mounting frame 85 is fitted into protruding wall 1240 with the inner circumferential surface of mounting frame 85 being guided by the outer circumferential surface of protruding wall 1240, and mounting frame 85 is attached to right side wall 123.

[0202] In this way, since the mounting frame 85 has an inner surface that is guided by the outer surface of the protruding wall 1240, it is possible to easily position the mounting frame 85 relative to the exhaust port 123a without providing a separate positioning member on the mounting frame 85.

[0203] The mounting frame 85 attached to the housing 102 is adhered to the right side wall 123 of the housing 102 by an adhesive, which is an adhesive layer having elasticity. The adhesive that adheres the mounting frame 85 to the right side wall 123 can be configured, for example, by double-sided tape. When the mounting frame 85 is attached to the right side wall 123, the adhesive is located between the mounting frame 85 and the right side wall 123. The adhesive can be disposed, for example, on two or four opposing sides of a front frame 851, a rear frame 852, an upper frame 853, and a lower frame 854 of the mounting frame 85 that is formed in a rectangular shape.

[0204] (holder) The holder 86 is detachable from the mounting frame 85 and configured to hold the filter 173. The holder 86 covers the exhaust port 123a. The holder 86 includes a fixed holder 861 and a rotating holder 862. The fixed holder 861 is attached to the mounting frame 85, and the rotating holder 862 is supported by the fixed holder 861 so as to be rotatable.

[0205] The fixed holder 861 is formed in a rectangular parallelepiped shape, and includes a front peripheral wall 8611, a rear peripheral wall 8612, an upper peripheral wall 8613, and a lower peripheral wall 8614. The front peripheral wall 8611 is located on the front surface of the fixed holder 861, the rear peripheral wall 8612 is located on the rear surface of the fixed holder 861, the upper peripheral wall 8613 is located on the upper surface of the fixed holder 861, and the lower peripheral wall 8614 is located on the lower surface of the fixed holder 861.

[0206] An opening 8615 is formed in the left surface of the fixed holder 861, and an opening 8616 is formed in the right surface of the fixed holder 861. The fixed holder 861 communicates in the left-right direction through the openings 8615 and 8616.

[0207] The fixed holder 861 has an engagement protrusion 8617 protruding downward from the upper peripheral wall 8613 and an engagement protrusion 8618 protruding upward from the lower peripheral wall 8614. The engagement protrusions 8617, 8618 are an example of protrusions that engage with a groove. The engagement protrusion 8617 is formed at two locations, the front end and the rear end of the upper peripheral wall 8613. The engagement protrusion 8618 is formed at two locations, the front end and the rear end of the lower peripheral wall 8614.

[0208] The engagement projection 8617 of the fixed holder 861 is engageable with a groove 853 b formed in the upper frame 853 of the mounting frame 85 , and the engagement projection 8618 of the fixed holder 861 is engageable with a groove 854 b formed in the lower frame 854 of the mounting frame 85 .

[0209] The fixed holder 861 is slidable in the front-rear direction with the engagement protrusions 8617 and 8618 engaged with the grooves 853b and 854b. In other words, the fixed holder 861 is slidable in the front-rear direction relative to the mounting frame 85, which is a direction perpendicular to the mounting direction of the mounting frame 85.

[0210] When attaching the holder 86 to the mounting frame 85, first, the holder 86 is slid from the front to the rear of the housing 2 so that the engagement protrusions 8617, 8618 located at the rear end of the fixed holder 861 engage with the grooves 853b, 854b of the mounting frame 85. Thereafter, the holder 86 is moved further rearward relative to the housing 2 so that the engagement protrusions 8617, 8618 located at the front end of the fixed holder 861 engage with the grooves 853b, 854b of the mounting frame 85, thereby attaching the holder 86 to the mounting frame 85.

[0211] In this manner, the holder 86 is attached to the mounting frame 85 by moving it relative to the mounting frame 85 in the front-rear direction perpendicular to the left-right direction in which the mounting frame 85 is attached to the housing 102. This makes it possible to easily attach the holder 86 to the mounting frame 85 even if there is little space in the left-right direction in which the mounting frame 85 is attached to the right wall 23 of the housing 2.

[0212] In particular, holder 86 is attached to mounting frame 85 by sliding it from the front of housing 2, which is the part accessed by the user, toward the rear, making it easy to attach holder 86 to mounting frame 85.

[0213] Furthermore, the mounting frame 85 has grooves 853b, 854b extending in the front-rear direction, which is the sliding direction of the holder 86, and the holder 96 has engagement protrusions 8617, 8618 that engage with the grooves 853b, 854b. This makes it possible to easily attach the holder 86 to the mounting frame 85 in a slidable manner.

[0214] In this embodiment, grooves 853b, 854b are provided in mounting frame 85, and engaging protrusions 8617, 8618 are provided in holder 86, but it is also possible to configure holder 86 to have a groove extending in the sliding direction of holder 86, and mounting frame 85 to have protrusions that engage with the grooves.

[0215] The rotating holder 862 is located at the lower end of the rotating holder 862 and is configured to be rotatable around a rotation axis X (see Figure 21) extending in the front-to-rear direction. By rotating around the rotation axis X, the rotating holder 862 can be moved between a closed position (position shown in Figure 17) that closes the opening 8616 of the fixed holder 861 and an open position (position shown in Figure 21) that opens the opening 8616.

[0216] The rotating holder 862 is formed in a rectangular parallelepiped shape, and includes a front peripheral wall 8621, a rear peripheral wall 8622, an upper peripheral wall 8623, and a lower peripheral wall 8624. When the rotating holder 862 is in the closed position, the front peripheral wall 8621 is located on the front surface of the rotating holder 862, the rear peripheral wall 8622 is located on the rear surface of the rotating holder 862, the upper peripheral wall 8623 is located on the upper surface of the rotating holder 862, and the lower peripheral wall 8624 is located on the lower surface of the rotating holder 862.

[0217] An opening 8625 is formed on the left surface of the rotating holder 862. The right surface of the rotating holder 862 is open and is provided with a holder side louver 8626a made of a plurality of blades arranged at intervals in the vertical direction. The rotating holder 862 in the closed position communicates in the left-right direction through the opening 8625 and the holder side louver 8626a. When the holder 76 is attached to the mounting frame 75 and the rotating holder 862 is in the closed position, the holder side louver 8626a is disposed opposite the exhaust port 123a.

[0218] The holder side louvers 8626a guide the air discharged from the exhaust port 123a, and are bent from the left side, which is the upstream side of the air discharge direction, to the right side, which is the downstream side. In this embodiment, the holder side louvers 8626a are inclined upward toward the right side with respect to the horizontal direction, and guide the air discharged to the right from the exhaust port 123a diagonally upward to the right.

[0219] 21, in the holder 86, when the rotating holder 862 is in the open position, the filter 173 can be accommodated in the rotating holder 862 through the opening 8625. The filter 173 accommodated in the rotating holder 862 is held by a front peripheral wall 8621, a rear peripheral wall 8622, an upper peripheral wall 8623, a lower peripheral wall 8624, and a holder side louvers 8626a. The front peripheral wall 8621 and the rear peripheral wall 8622 are examples of side walls that hold a filter.

[0220] By moving the rotating holder 862 holding the filter 173 to the closed position around the rotation axis X, the filter 173 can be accommodated in the holder 86 and attached.

[0221] Furthermore, when the rotating holder 862 is moved from the closed position to the open position with the filter 173 attached inside the holder 86, the rotating holder 862 moves to the open position while holding the filter 173. The user can replace the filter 173 by removing the filter 173 from the rotating holder 862 that has been moved to the open position, and holding another filter 173 in the rotating holder 862 in the open position.

[0222] In this case, by rotating the rotating holder 862 relative to the fixed holder 861 and moving it from the closed position to the open position, the filter 173 can be replaced while the holder 86 remains attached to the mounting frame 85, making it possible to facilitate the replacement work of the filter 173.

[0223] A front peripheral wall 8621 of the rotating holder 862 has a notch 8621a formed by cutting out a part of the front peripheral wall 8621, and a rear peripheral wall 8622 of the rotating holder 862 has a notch 8622a formed by cutting out a part of the rear peripheral wall 8622.

[0224] Filter 173 housed in rotating holder 862 is exposed to the outside from notch 8621a in front peripheral wall 8621 and notch 8622a in rear peripheral wall 8622. Therefore, the portions of filter 173 held in rotating holder 862 that are exposed from notch 8621a and notch 8622a can be pinched with hands and easily removed from rotating holder 862. This makes it possible to easily replace filter 173.

[0225] [Third embodiment of image forming apparatus] The image forming apparatus 1 can be configured as an image forming apparatus 1B shown in Figures 22 and 23. The image forming apparatus 1B includes a housing 202 formed in a substantially rectangular parallelepiped shape. A right frame 226 is housed in the right end portion of the housing 202, and the housing 202 includes a right side wall 223 covering the right side of the right frame 226.

[0226] Image forming apparatus 1B is equipped with a fan 271 that exhausts air inside housing 202 to the outside of housing 202. Fan 271 is supported by right frame 226. Right side wall 223 of housing 202 is equipped with exhaust port 223a that penetrates right side wall 223 in the left-right direction. Exhaust port 223a is formed in a circular shape. Exhaust port 223a is located at the rear of right side wall 223. Right side wall 223 is an example of a side wall in which an exhaust port is formed.

[0227] 23 and 24, the housing 202 includes a main body louver 224 disposed at the exhaust port 223a. The main body louver 224 is located to the right of the fan 271.

[0228] The main body louver 224 is formed in a rectangular shape along the periphery of the exhaust port 223a, and includes a protruding wall 2240 that protrudes rightward from the outer surface of the right side wall 223, and a blade 2241 that extends in the front-rear direction within an area surrounded by the protruding wall 2240. A plurality of blades 2241 are arranged at intervals in the up-down direction. The protruding wall 2240 is formed in a circular shape.

[0229] In this embodiment, the main body louver 224 is formed separately from the right side wall 223 and is removably attached to the right side wall 123, but the main body louver 224 may be formed by being integrally molded with the right side wall 223.

[0230] Fan 271 is disposed at a position where a plane of projection of fan 271 toward right side wall 223 overlaps with exhaust port 223a in the left-right direction. Driving fan 271 generates an airflow from left to right, and the airflow generated by fan 271 exhausts air inside housing 202 to the outside of housing 202 through main body louver 224 disposed at exhaust port 223a.

[0231] When the air inside the housing 202 is exhausted to the outside of the housing 202 through the exhaust port 223a, substances such as ozone and toner present inside the housing 202 are exhausted to the outside of the housing 202 together with the air.

[0232] As shown in FIGS. 22 to 25, the image forming apparatus 1B includes a filter 273, a mounting frame 87, and a holder 88. The filter 273 is a filter member.

[0233] (filter) Filter 273 is a filter that removes substances such as ozone and toner discharged through exhaust port 223a. Filter 273 is held by holder 86, and is located to the right of main body louver 224. Filter 273 is formed in a cylindrical shape, and is disposed with its axial direction aligned in the left-right direction.

[0234] (Mounting frame) The mounting frame 87 is formed in an annular shape and has a circular outer shape. The mounting frame 87 is disposed so as to surround the exhaust port 223a, and is attached to the right side wall 223 of the housing 202. The mounting frame 87 is attached to the right side wall 223 in the left-right direction.

[0235] In the mounting frame 87 attached to the right side wall 223, an inner peripheral surface 87a of the mounting frame 87 is guided by the outer peripheral surface of the protruding wall 2240. In other words, the mounting frame 87 has an inner peripheral surface 87a that is guided by the outer peripheral surface of the protruding wall 2240.

[0236] When mounting frame 87 is attached to right side wall 223 of housing 202, mounting frame 87 is moved from right to left while inner peripheral surface 87a is aligned with the outer peripheral surface of protruding wall 2240. As a result, as shown in FIG. 24 , mounting frame 87 is fitted into protruding wall 2240 with inner peripheral surface 87a of mounting frame 87 guided by the outer peripheral surface of protruding wall 2240, and mounting frame 87 is attached to right side wall 223.

[0237] In this way, since the mounting frame 87 has an inner surface 87a that is guided by the outer circumferential surface of the protruding wall 2240, it is possible to easily position the mounting frame 87 relative to the exhaust port 223a without providing a separate positioning member on the mounting frame 87.

[0238] The mounting frame 87 attached to the housing 202 is adhered to the right side wall 223 of the housing 202 by adhesive 81C (see FIG. 25), which is an elastic adhesive layer. The adhesive 81C that adheres the mounting frame 87 to the right side wall 223 can be formed of, for example, double-sided tape. When the mounting frame 87 is attached to the right side wall 223, the adhesive 81C is located between the mounting frame 87 and the right side wall 223. The adhesive is formed in an annular shape and is disposed around the entire circumference of the mounting frame 87.

[0239] By disposing adhesive material 81C around the entire periphery of mounting frame 87, the adhesive strength of mounting frame 87 to housing 2 can be increased.

[0240] The mounting frame 87 includes a slide groove 871, a through groove 872, and a stopper 873. The slide groove 871 is a groove extending in the circumferential direction. A plurality of slide grooves 871 are formed in the circumferential direction.

[0241] The through groove 872 is a groove that penetrates in the left-right direction, which is the mounting direction of the mounting frame 87. The through groove 872 is located between the slide grooves 871 in the circumferential direction. The stopper 873 is a protruding piece that protrudes outward from the slide groove 871, and is located at the end of the slide groove 871 in the circumferential direction.

[0242] (holder) The holder 88 is detachable from the mounting frame 87 and configured to hold the filter 273. The holder 88 covers the exhaust port 223a. The holder 88 has a cylindrical peripheral wall 881. An opening 882 is formed in the left side surface of the holder 88 located on the left end side of the peripheral wall 881, and an opening 883 is formed in the right side surface of the holder 88 located on the right end side of the peripheral wall 881, so that the holder 88 is communicated in the left-right direction.

[0243] The left side surface of holder 88 is located at the end closer to exhaust port 223a in the left-right direction, and the right side surface of holder 88 is located at the end farther from exhaust port 223a in the left-right direction. The right side surface of holder 88 is located at the end farther from the exhaust port in the mounting direction of the mounting frame, and is an example of an outer side surface having an opening.

[0244] The holder 88 has a rib 884 that protrudes from the left end of the peripheral wall 881 toward the inner diameter side. The rib 884 is formed at a plurality of locations in the circumferential direction of the peripheral wall 881. The rib 884 is capable of passing through the through groove 872 of the mounting frame 87 in the left-right direction, and the rib 884 that has passed through the through groove 872 from right to left is configured to be movable in the circumferential direction along the slide groove 871 of the mounting frame 87.

[0245] When attaching the holder 88 to the mounting frame 87, the holder 88 is moved from right to left while circumferentially aligning the rib 884 of the holder 88 with the through groove 872 of the mounting frame 87, so that the rib 884 passes from right to left through the through groove 872.

[0246] After the rib 884 passes through the through groove 872, the holder 88 is moved circumferentially relative to the mounting frame 87, and is positioned so that the circumferential positions of the rib 884 and the slide groove 871 are aligned. When the circumferential positions of the rib 884 and the slide groove 871 are aligned, the rib 884 is engaged with the slide groove 871, and the holder 88 is maintained attached to the mounting frame 87.

[0247] In this way, by passing the rib 884 of the holder 88 through the through groove 872 of the mounting frame 87 and then moving the holder 88 in the circumferential direction, the rib 884 is prevented from coming out of the through groove 872, making it possible to easily attach the holder 88 to the mounting frame 87.

[0248] The holder 88 attached to the mounting frame 87 is movable in the circumferential direction relative to the mounting frame 87. The stoppers 873 of the mounting frame 87 come into contact with the ribs 884 of the holder 88 that move in the circumferential direction, thereby restricting the movement of the holder 88 in the circumferential direction.

[0249] This makes it possible to stop the holder 88 moving in the circumferential direction at a phase where the rib 884 abuts against the stopper 873. The circumferential position of the stopper 873 formed on the mounting frame 87 can be set appropriately according to the circumferential phase at which the holder 88 is desired to be stopped.

[0250] The holder 88 is provided with holder-side louvers 883a, which are blades extending radially and arranged at intervals in a direction perpendicular to the extending direction, at an opening 883 on the right end side of a peripheral wall 881 that forms the right side surface of the holder 88. When the holder 88 is attached to the mounting frame 87, the holder 88 covers the exhaust port 223a, and the holder-side louvers 883a are arranged opposite the first exhaust port 223a.

[0251] The holder side louvers 883a guide the air discharged from the exhaust port 223a, and are bent from the left side, which is the upstream side of the air discharge direction, to the right side, which is the downstream side. In this embodiment, the holder side louvers 883a are inclined with respect to the horizontal direction, and guide the air discharged to the right from the exhaust port 223a in a direction inclined with respect to the horizontal direction.

[0252] As shown in FIG. 26, the holder 88 is configured to be movable in a circumferential direction relative to the mounting frame 87. Therefore, by moving the holder 88 in a circumferential direction, the guide direction of the air discharged from the exhaust port 223a by the holder side louvers 883a can be adjusted.

[0253] For example, the holder 88 shown in Fig. 26(a) is adjusted so that the air guide direction by the holder side louvers 883a is approximately forward when viewed from the left-right direction. The holder 88 shown in Fig. 26(b) is adjusted so that the air guide direction by the holder side louvers 883a is rear-upper when viewed from the left-right direction. Furthermore, the holder 88 shown in Fig. 26(c) is adjusted so that the air guide direction by the holder side louvers 883a is upward when viewed from the left-right direction.

[0254] 24, in image forming apparatus 1, exhaust port 223a has a diameter R1. Also, opening 883 on the right end side of peripheral wall 881, which forms the right side surface of holder 88, has a diameter R2. Diameter R2 of opening 883 is larger than diameter R1 of exhaust port 223a (R2>R1).

[0255] In this way, by forming the diameter R2 of the opening 883 larger than the diameter R1 of the exhaust port 223a, it is possible for the exhaust gas discharged through the exhaust port 223a to be discharged from the right side surface of the holder 88 without leakage and with low resistance.

[0256] [Fourth embodiment of the holder] The holder 77 attached to the first mounting frame 751 of the mounting frame 75 attached to the housing 2 can also be configured like a holder 90 shown in FIGS.

[0257] The holder 90 includes a lower holder 91 facing the first exhaust port 23a in the right side wall 23 of the housing 2, and an upper holder 92 located on the opposite side of the lower holder 91 from the first exhaust port 23a. The upper holder 92 is attached to the lower holder 91. The holder 90 is configured to hold the filter 273 by the upper holder 92 and the lower holder 91.

[0258] The lower holder 91 has lower holder side louvers 911 made up of a plurality of blades 911a arranged at intervals in the vertical direction. The lower holder 91 can be attached to the first mounting frame 751. When the lower holder 91 is attached to the first mounting frame 751, the lower holder 91 covers the first exhaust port 23a, and the lower holder side louvers 911 are disposed opposite the first exhaust port 23a.

[0259] The lower holder side louvers 911 guide the air discharged from the first exhaust port 23a, and the blades 911a of the lower holder side louvers 911 are bent from the left side, which is the upstream side, to the right side, which is the downstream side, in the direction of air discharge. In this embodiment, the blades 911a are bent from the upstream side to the downstream side so as to incline upward and then extend horizontally. The lower holder side louvers 911 guide the air discharged to the right from the first exhaust port 23a in the horizontal direction.

[0260] The upper holder 92 includes upper-holder side louvers 921 each made up of a plurality of blades 921a arranged at intervals in the vertical direction. When the upper holder 92 is attached to the lower holder 91, the upper-holder side louvers 921 are disposed opposite the lower-holder side louvers 911.

[0261] The upper holder side louvers 921 guide the air discharged from the first exhaust port 23a and passing through the lower holder side louvers 911, and the vanes 921a of the upper holder side louvers 921 are bent from the left side, which is the upstream side, to the right side, which is the downstream side, in the direction of air discharge. In this embodiment, the vanes 921a are bent so as to extend horizontally from the upstream side to the downstream side and then incline upward. The upper holder side louvers 921 guide the air discharged to the right from the first exhaust port 23a diagonally upward to the right.

[0262] The filter 273 is a filter that removes substances such as ozone and toner discharged through the first exhaust port 23a. The filter 273 is an example of a filter that removes substances discharged through an exhaust port.

[0263] The filter 273 is located between the lower holder 91 and the upper holder 92. The filter 273 is sandwiched between the lower holder 91 and the upper holder 92 attached to the lower holder 91. The holder 90 holds the filter 273 by sandwiching the filter 273 between the lower holder 91 and the upper holder 92.

[0264] The lower holder 91 includes an engaged portion 912 and an engaging portion 913. The upper holder 92 includes an engaging portion 922 and an engaged portion 923.

[0265] When attaching the upper holder 92 to the lower holder 91, with the engaging portion 922 of the upper holder 92 engaged with the engaged portion 912 of the lower holder 91, the lower holder 91 and the upper holder 92 are closed while the filter 273 is sandwiched between the lower holder 91 and the upper holder 92. By closing the lower holder 91 and the upper holder 92, the engaging portion 913 of the lower holder 91 engages with the engaged portion 923 of the upper holder 92, and the upper holder 92 is attached to the lower holder 91.

[0266] In the holder 90, the filter 273 is sandwiched between the upper holder 92 and the lower holder 91, so that the user does not touch the filter 273 when attaching or detaching the holder 90 to or from the first mounting frame 751. Therefore, the user can replace the filter 273 without touching the filter 273.

[0267] The holder 90 can be attached to the first mounting frame 751, for example, by providing the lower holder 91 with engaging claws that can engage with the engaging grooves 754, 755 of the first mounting frame 751. The holder 90 can also be attached to other mounting frames, such as the second mounting frame 752 of the mounting frame 75. [Explanation of symbols]

[0268] 1. Image forming device 2. Chassis 23 Right side wall 23a First exhaust port 23b Second exhaust port 24 First main body louver 25 Second main body louver 73 First Filter 74 Second Filter 75, 75A, 85, 87 mounting frame 76, 76A, 77, 78, 86, 88, 90 Holder 81, 81A, 81B adhesive 91 Lower holder 92 Upper Holder 123a, 223a exhaust port 173, 273 Filter 754, 755, 756, 757 Engagement groove 240 1st protruding wall 240a Front outer circumferential surface 240b Rear outer circumferential surface 240c Upper outer surface 240d Lower outer surface 250 2nd protruding wall 250a Front outer circumferential surface 250b Rear outer circumferential surface 250c Upper outer surface 250d Lower outer surface 751 First mounting frame 752 Second mounting frame 753 Connecting part 776a, 786a Holder side louvers 853b, 854b groove 861 Fixed Holder 862 Rotating holder 871 Slide groove 872 Through groove 873 Stopper 883 Aperture 884 Ribs 7511a, 7512a, 7513a, 7514a Inner surface 7521a, 7522a, 7523a, 7524a Inner surface 7611, 7621 Front peripheral wall 7612, 7622 Rear peripheral wall 7613, 7623 Upper peripheral wall 7614, 7624 Lower peripheral wall 7615, 7625 Left peripheral wall 7615a, 7625a aperture 7615b, 7625b Rib 7616, 7626 Right peripheral wall 7616a Upper holder side louver 7626a Lower holder side louver 8617, 8618 Engagement protrusion 8621 Front peripheral wall 8621a Notch 8622 Rear peripheral wall 8622a Notch R1 (exhaust port) diameter R2 (holder opening) diameter

Claims

1. a housing including a side wall in which an exhaust port is formed, and a protruding wall disposed at the exhaust port and protruding from the side wall; a mounting frame disposed so as to surround the exhaust port and attached to the housing; a holder that is detachable from the mounting frame and configured to hold a filter that removes substances discharged through the exhaust port.

2. the holder has a peripheral wall in which an opening for attaching the filter is formed; 2. The image forming apparatus according to claim 1, wherein the peripheral wall includes a rib protruding into the opening.

3. 2. The image forming apparatus according to claim 1, wherein the mounting frame has an inner peripheral surface that is guided by the outer peripheral surface of the protruding wall.

4. The exhaust port includes a first exhaust port and a second exhaust port arranged next to the first exhaust port, the protruding wall includes a first protruding wall disposed at the first exhaust port and a second protruding wall disposed at the second exhaust port, 2. The image forming apparatus of claim 1, wherein the mounting frame comprises a first mounting frame arranged to surround the first exhaust port, a second mounting frame arranged to surround the second exhaust port, and a connecting portion connecting the first mounting frame and the second mounting frame.

5. the holder is configured by a first holder that integrally covers the first exhaust port and the second exhaust port, or is configured by a second holder that covers the first exhaust port, and a third holder that is formed separately from the second holder and covers the second exhaust port, 5. The image forming apparatus according to claim 4, wherein the mounting frame includes a first engagement groove engageable with the first holder, a second engagement groove engageable with the second holder, and a third engagement groove engageable with the third holder.

6. the first holder includes first holder side louvers disposed opposite the first exhaust port, guiding the air exhausted from the first exhaust port and bending from the upstream side toward the downstream side in the air exhaust direction, and second holder side louvers disposed opposite the second exhaust port, guiding the air exhausted from the second exhaust port and bending from the upstream side toward the downstream side in the air exhaust direction, 6. The image forming apparatus according to claim 5, wherein a bending direction of the first holder side louvers is different from a bending direction of air of the second holder side louvers.

7. the second holder is disposed opposite the first exhaust port, guides the air exhausted from the first exhaust port, and includes a third holder side louver that is bent from an upstream side toward a downstream side in a direction in which the air is exhausted; the third holder is disposed opposite the second exhaust port, guides the air exhausted from the second exhaust port, and includes a fourth holder side louver that is bent from an upstream side toward a downstream side in a direction in which the air is exhausted; 6. The image forming apparatus according to claim 5, wherein a bending direction of the third holder side louvers is different from a bending direction of the fourth holder side louvers.

8. The second engagement groove is formed in the first mounting frame, The third engagement groove is formed in the second mounting frame, 6. The image forming apparatus according to claim 5, wherein a position at which the third engagement groove is formed in the second mounting frame is different from a position at which the second engagement groove is formed in the first mounting frame.

9. 2. The image forming apparatus according to claim 1, further comprising an adhesive layer between said side wall and said mounting frame, said adhesive layer having elasticity and bonding said side wall and said mounting frame.

10. The image forming apparatus according to claim 9 , wherein the adhesive layer is disposed on two sides of the mounting frame which is formed in a rectangular shape.

11. The image forming apparatus according to claim 9 , wherein the adhesive layer is disposed on four sides of the mounting frame which is formed in a rectangular shape.

12. The image forming apparatus according to claim 9 , wherein the adhesive layer is disposed over the entire periphery of the mounting frame.

13. 2. The image forming apparatus according to claim 1, wherein the holder is attached to the mounting frame by sliding relative to the mounting frame in a direction perpendicular to a mounting direction of the mounting frame relative to the housing.

14. the orthogonal direction is a front-rear direction of the housing, 14. The image forming apparatus according to claim 13, wherein the holder is attached to the mounting frame by sliding from the front to the rear of the housing.

15. one of the holder and the mounting frame has a groove extending in a sliding direction of the holder, 14. The image forming apparatus according to claim 13, wherein the other of the holder and the mounting frame is provided with a protrusion that engages with the groove.

16. The holder includes a fixed holder attached to the mounting frame; 16. The image forming apparatus according to claim 13, further comprising a rotating holder that is rotatably supported by the fixed holder.

17. the rotating holder includes a side wall that holds the filter; The image forming apparatus according to claim 16 , wherein the side wall has a notch formed by cutting out a part of the side wall.

18. The mounting frame has a circular outer shape, 2. The image forming apparatus according to claim 1, wherein the holder attached to the mounting frame is movable in a circumferential direction relative to the mounting frame.

19. The mounting frame includes a slide groove formed along a circumferential direction and a through groove penetrating the mounting frame in a mounting direction, The holder includes a rib that can pass through the through groove, The image forming apparatus according to claim 18 , wherein the rib that has passed through the through groove is movable along the slide groove.

20. 20. The image forming apparatus according to claim 19, wherein the mounting frame includes a stopper that protrudes from the slide groove and abuts against the rib of the holder to restrict circumferential movement of the holder.

21. the holder is located at an end portion away from the exhaust port in a mounting direction of the mounting frame, and has an outer surface having an opening; 21. The image forming apparatus according to claim 18, wherein a diameter of the opening in the outer surface is larger than a diameter of the exhaust port.

22. the holder includes a lower holder facing the exhaust port and having a first louver, and an upper holder located on the opposite side of the lower holder from the exhaust port and having a second louver, 2. The image forming apparatus according to claim 1, wherein the filter is located between the lower holder and the upper holder.

Images