Patent Publication Number: US-11662688-B2

Title: Image forming apparatus with inclined portions inclining in different directions and cooled parts disposed between inclined portions

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2021-135293 filed Aug. 23, 2021. 
     BACKGROUND 
     (i) Technical Field 
     The present disclosure relates to an image forming apparatus. 
     (ii) Related Art 
     For image forming apparatuses including copiers, printers, facsimile machines, and the like, the technology described in Japanese Unexamined Patent Application Publication No. 2011-107478 (paragraphs [0019] to [0025], FIG. 2 to FIG. 4) is known. 
     Japanese Unexamined Patent Application Publication No. 2011-107478 describes a configuration in which a vertical substrate arrangement space (100) is provided on the side of an image forming apparatus, air is caused to flow between an air-intake port (140) on the lower side and an air-discharge port (150) on the upper side to generate an airflow in a vertical direction, and air is thereby caused to flow along a circuit board ( 200 ). 
     SUMMARY 
     Aspects of non-limiting embodiments of the present disclosure relate to a technology that makes it possible to cool a space extending inward from a wall surface of an image forming apparatus up to the far side of the space. 
     Aspects of certain non-limiting embodiments of the present disclosure address the above advantages and/or other advantages not described above. However, aspects of the non-limiting embodiments are not required to address the advantages described above, and aspects of the non-limiting embodiments of the present disclosure may not address advantages described above. 
     According to an aspect of the present disclosure, there is provided an image forming apparatus including: a body of the image forming apparatus; a first inclined portion that is inclined upward from one side surface toward another side surface of the body of the image forming apparatus; a second inclined portion that is inclined downward from an inner end portion of the first inclined portion toward the one side surface; multiple cooled parts that are disposed in a space between the first inclined portion and the second inclined portion and that are disposed to be spaced from each other in a direction from the one side surface to the other side surface; a first wall member that is disposed above the first inclined portion and that has a first ventilation part; and a second wall member that is disposed below the second inclined portion and that has a second ventilation part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       An exemplary embodiment of the present disclosure will be described in detail based on the following figures, wherein: 
         FIG.  1    is a general explanatory view of an image forming apparatus according to Example 1; 
         FIG.  2    is an explanatory view of a frame body part of an image forming apparatus according to Example 1; 
         FIG.  3    is an explanatory view of an airflow in a narrowed space part according to Example 1; and 
         FIGS.  4 A and  4 B  are explanatory views of wall members according to Example 1,  FIG.  4 A  being an explanatory view of a first wall member,  FIG.  4 B  being an explanatory view of a second wall member. 
     
    
    
     DETAILED DESCRIPTION 
     Next, specific examples (hereinafter referred to as examples) of an exemplary embodiment of the present disclosure will be described with reference to the drawings. The present disclosure is, however, not limited to the following examples. 
     For ease of understanding of the following description, in the drawings, the front-rear direction is denoted by the X-axis direction, the left-right direction is denoted by the Y-axis direction, the up-down direction is denoted by the Z-axis direction, and directions or sides indicated by the arrows X, −X, Y, −Y, Z, and −Z denote the front direction, the rear direction, the right direction, the left direction, the up direction, and the down direction, or the front side, the rear side, the right side, the left side, the upper side, and the lower side, respectively. 
     In the drawings, a middle dot in a circle denotes an arrow from the rear toward the front of the drawings, and a cross in a circle denotes an arrow from the front toward the rear of the drawings. 
     Note that in the following description with reference to the drawings, illustration of members other than members required for the description is omitted, as appropriate, for ease of understanding. 
     Example 1 
       FIG.  1    is a general explanatory view of an image forming apparatus according to Example 1. 
     In  FIG.  1   , a copier U as one example of the image forming apparatus according to Example 1 of the present disclosure includes a printer U 1  as one example of an image recorder. A scanner U 2  as one example of a reading unit and as one example of an image reading device is supported above the printer U 1 . An autofeeder U 3  as one example of a document transporting device is supported above the scanner U 2 . 
     A document tray TG 1  as one example of a medium housing part is disposed above the autofeeder U 3 . On the document tray TG 1 , multiple documents Gi that are to be copied can be stacked and housed. A paper output tray TG 2  for documents as one example of a document discharge part is formed below the document tray TG 1 . Between the document tray TG 1  and the paper output tray TG 2  for documents, a document transport roller U 3   b  is disposed along a document transport path U 3   a.    
     A platen glass PG as one example of a transparent document table is disposed at the upper surface of the scanner U 2 . In the scanner U 2  according to Example 1, a reading unit U 2   a  as one example of a reader is disposed below the platen glass PG. The reading unit U 2   a  according to Example 1 is supported along the lower surface of the platen glass PG to be movable in the left-right direction as one example of a sub-scanning direction. The reading unit U 2   a  is electrically connected to the image processor GS. 
     The image processor GS is electrically connected to a writing circuit DL of the printer U 1 . The writing circuit DL is electrically connected to exposure devices LHy, LHm, LHc, and LHk as one example of a latent image formation unit. 
     The exposure devices LHy to LHk according to Example 1 are configured by, for example, an LED head in which multiple LEDs are arranged in a main scanning direction. The exposure devices LHy to LHk are configured to be able to output writing light corresponding to each of colors of Y, M, C, and K in accordance with a signal that is input from the writing circuit DL. 
     The writing timing of the writing circuit DL and the power supply timing of a power supply circuit E are controlled in accordance with a control signal from a controller C as one example of a control unit. 
     In  FIG.  1   , photoreceptors PRy, PRm, PRc, and PRk as one example of an image holding part are disposed above the exposure devices LHy to LHk. In  FIG.  1   , writing regions Q 1   y , Q 1   m , Q 1   c , and Q 1   k  are configured by regions in which writing light is radiated with respect to each of the photoreceptors PRy to PRk. 
     Charging rollers CRy, CRm, CRc, and CRk as one example of a charging part are disposed on the upstream side of the writing regions Q 1   y  to Q 1   k  in a rotation direction of the photoreceptors PRy to PRk. The charging rollers CRy to CRk according to Example 1 are supported in contact with the photoreceptors PRy to PRk to be rotatable by following the photoreceptors PRy to PRk. 
     Developing devices Gy, Gm, Gc, and Gk as one example of a developing unit are disposed on the downstream side of the writing regions Q 1   y  to Q 1   k  in the rotation direction of the photoreceptors PRy to PRk. Developing regions Q 2   y , Q 2   m , Q 2   c , and Q 2   k  are configured by regions in which the photoreceptors PRy to PRk and the developing devices Gy to Gk face each other. 
     Primary transfer rollers T 1   y , T 1   m , T 1   c , and T 1   k  as one example of a primary transfer part are disposed on the downstream side of the developing devices Gy to Gk in the rotation direction of the photoreceptors PRy to PRk. Primary transfer regions Q 3   y , Q 3   m , Q 3   c , and Q 3   k  are configured by regions in which the photoreceptors PRy to PRk and the primary transfer rollers T 1   y  to T 1   k  face each other. 
     Photoreceptor cleaners CLy, CLm, CLc, and CLk as one example of a cleaning part are disposed on the downstream side of the primary transfer rollers T 1   y  to T 1   k  in the rotation direction of the photoreceptors PRy to PRk. 
     As one example of a yellow-visible-image forming part according to Example 1, a yellow image forming member Uy that forms a yellow toner image is configured by the photoreceptor PRy, the charging roller CRy, the exposure device LHy, the developing device Gy, the primary transfer roller T 1   y , and the photoreceptor cleaner CLy that are for yellow. Similarly, a magenta image forming member Um, a cyan image forming member Uc, and a black image forming member Uk are configured by the photoreceptors PRm, PRc, and PRk, the charging rollers CRm, CRc, and CRk, the exposure devices LHm, LHc, and LHk, the developing devices Gm, Gc, and Gk, the primary transfer rollers T 1   m , T 1   c , and T 1   k , and the photoreceptor cleaners CLm, CLc, and CLk, respectively. 
     A belt module BM as one example of an intermediate transfer device is disposed above the photoreceptors PRy to PRk. The belt module BM includes an intermediate transfer belt B as one example of an image holding part and as one example of an intermediate transfer part. The intermediate transfer belt B is configured by an endless belt-shaped member. 
     The intermediate transfer belt B according to Example 1 is rotatably supported by a tension roller Rt as one example of a stretching part, a walking roller Rw as one example of a deviation correcting part, an idler roller Rf as one example of a driven part, a backup roller T 2   a  as one example of a part that faces a secondary transfer region, the primary transfer rollers T 1   y  to T 1   k , and a drive roller Rd as one example of a driving part. In Example 1, the intermediate transfer belt B is rotated in response to a driving force being transmitted to the drive roller Rd. 
     A secondary transfer roller T 2   b  as one example of a secondary transfer part is disposed at a position facing the backup roller T 2   a  with the intermediate transfer belt B interposed therebetween. As one example of a transfer device, a secondary transfer unit T 2  according to Example 1 is configured by the backup roller T 2   a , the secondary transfer roller T 2   b , and the like. A secondary transfer region Q 4  is configured by a region in which the secondary transfer roller T 2   b  and the intermediate transfer belt B are in contact with each other. 
     A belt cleaner CLb as one example of an intermediate-transfer-body cleaning device is disposed on the downstream side of the secondary transfer region Q 4  in a rotation direction of the intermediate transfer belt B. 
     A transfer device T 1 +T 2 +B according to Example 1 as one example of a transfer part is configured by the primary transfer rollers T 1   y  to T 1   k , the intermediate transfer belt B, the secondary transfer unit T 2 , and the like. An image recorder Uy to Uk+T 1 +T 2 +B according to Example 1 is configured by the image forming members Uy to Uk and the transfer device T 1 +T 2 +B. 
     In Example 1, the walking roller Rw as one example of a second supporting part is disposed above the backup roller T 2   a  as one example of a first supporting part in the direction of gravity. In other words, the walking roller Rw that is disposed immediately downstream of the backup roller T 2   a  is disposed above the backup roller T 2   a  in the direction of gravity. In Example 1, the drive roller Rd is disposed above the walking roller Rw in the direction of gravity. Therefore, on the downstream side of the secondary transfer region Q 4  as one example of a final transfer region, the intermediate transfer belt B according to Example 1 is inclined upward toward the downstream side in the rotation direction of the intermediate transfer belt B. In Example 1, an angle θ 1  formed by a surface of the intermediate transfer belt B that has passed through the secondary transfer region Q 4  with respect to the horizontal direction is set to, for example, 15°. 
     The belt cleaner CLb according to Example 1 is disposed to face the drive roller Rd. 
     In Example 1, a configuration in which the walking roller Rw is disposed between the backup roller T 2   a  and the drive roller Rd is exemplified. The configuration is, however, not limited thereto. In the configuration, the walking roller Rw may be disposed at the position of the idler roller Rf, or a different mechanism that corrects deviation may be provided without the provision of the walking roller Rw. In these cases, the second supporting part is the drive roller Rd, and the drive roller Rd functions as both the second supporting part and the driving part. When the drive roller Rd functions as both the second supporting part and the driving part, the number of components may be reduced. Meanwhile, by disposing the second supporting part (walking roller Rw) and the driving part (drive roller Rd) individually, as in Example 1, it may be possible to move each of the positions of the second supporting part and the driving part. Thus, flexibility in design may be increased, and it may become easy to cope with the orientation of the intermediate transfer belt B, restriction of the internal space of the copier U, and the like. 
     In  FIG.  1   , paper-feeding trays TR 1  and TR 2  as one example of a paper feeding part are disposed below the image forming members Uy to Uk. The paper-feeding trays TR 1  and TR 2  are supported to be extractable and insertable in the front-rear direction. Recording paper S as one example of a medium is housed on the paper-feeding trays TR 1  and TR 2 . 
     In Example 1, the first paper-feeding tray TR 1  on the upper side is disposed to be inclined upward from the right side, which is the upstream side in the transport direction of the recording paper S, toward the left side, which is the downstream side. In Example 1, an inclination angle θ 2  of the bottom surface of the first paper-feeding tray TR 1  with respect to the horizontal direction is set to 35°. 
     The second paper-feeding tray TR 2  on the lower side is disposed horizontally in the transport direction of recording paper. Therefore, in Example 1, the maximum size of the recording paper S that can be housed on the first paper-feeding tray TR 1  on the upper side is larger than that of the recording paper S that can be housed on the second paper-feeding tray TR 2 . 
     A pickup roller Rp as one example of a take-out part is disposed on the upper left side of each of the paper-feeding trays TR 1  and TR 2 . A handling roller Rs as one example of a handling part is disposed on the downstream side of the pickup roller Rp in the transport direction of the recording paper S. As one example of a medium transport path, a paper-feeding path SH 1  extending upward is formed on the downstream side of the handling roller Rs in the transport direction of the recording paper S. Multiple transport rollers Ra as one example of a transporting part are disposed in the paper-feeding path SH 1 . 
     A manual feeding tray TR 0  as one example of a paper feeding part is disposed at a lower left portion of the copier U. At an upper right portion of the manual feeding tray TR 0 , a pickup roller Rp 0  is disposed, and a manual paper-feeding path SH 0  extends. The manual paper-feeding path SH 0  joins the paper-feeding path SH 1 . 
     In the paper-feeding path SH 1 , a registration roller Rr as one example of a transport-timing adjuster is disposed on the upstream side of the secondary transfer region Q 4 . A transport path SH 2  extends from the registration roller Rr toward the secondary transfer region Q 4 . 
     A fixing device F as one example of a fixing unit is disposed on the downstream side of the secondary transfer region Q 4  in the transport direction of the recording paper S. The fixing device F includes a heating roller Fh as one example of a fixing member for heating and a pressurizing roller Fp as one example of a fixing member for pressurizing. A fixation region Q 5  is configured by a region in which the heating roller Fh and the pressurizing roller Fp are in contact with each other. 
     A lower paper output tray TRh as one example of a medium discharge part is formed at the upper surface of the printer U 1 . Above the fixing device F, a paper output path SH 3  as one example of a transport path extends toward the lower paper output tray TRh. A paper output roller Rh as one example of a medium transporting part is disposed at the downstream end of the paper output path SH 3 . 
     An upper paper output tray TRh 2  as one example of a medium discharge part is disposed above the lower paper output tray TRh. An upper transport path SH 4  that branches from the paper output path SH 3  and that extends toward the upper paper output tray TRh 2  is formed above the fixing device F. 
     As one example of a medium transporting part, a reversing roller Rb that is rotatable forwardly and reversely is disposed in the upper transport path SH 4 . Above a position at which the upper transport path SH 4  branches from the paper output path SH 3 , a reversing path SH 6  as one example of a medium transport path branches from the upper transport path SH 4  toward the lower left side. 
     A gate GT 1  as one example of a switching part is disposed across a part where the upper transport path SH 4  branches from the paper output path SH 3  and a part where the reversing path SH 6  branches from the upper transport path SH 4 . The gate GT 1  is supported to be switchable between a first guide position (second position) at which the recording paper S from the fixing device F is guided toward the lower paper output tray TRh and at which the recording paper S is guided from the upper transport path SH 4  to the reversing path SH 6  and a second guide position (first position) at which the recording paper S from the fixing device F is guided to the upper transport path SH 4 . 
     The multiple transport rollers Ra as one example of a medium transporting part are disposed in the reversing path SH 6 . The downstream end of the reversing path SH 6  joins the paper-feeding path SH 1  on the upstream side of the registration roller Rr. 
     Image Formation Operation 
     In the copier U according to Example 1 having the configuration, when an operator manually places the document Gi on the platen glass PG to copy the document Gi, the reading unit U 2   a  moves from an initial position in the left-right direction, and the document Gi on the platen glass PG is scanned while being exposed to light. When the autofeeder U 3  is used to automatically transport and copy the document Gi, multiple documents Gi housed on the document tray TG 1  are sequentially transported to and pass through a document reading position on the platen glass PG and discharged onto the paper output tray TG 2  for documents. Each document Gi that sequentially passes through the reading position on the platen glass PG is exposed to light and scanned by the reading unit U 2   a . Reflection light from the document Gi is received by the reading unit U 2   a . The reading unit U 2   a  converts the received reflection light reflected by the document Gi into electric signals. When both faces of the document Gi are to be read, the document Gi is also read by a reading sensor. 
     The image processor GS receives electric signals that are output from the reading unit U 2   a . The image processor GS converts electric signals of an image of colors of R, G, and B read by the reading unit U 2   a  into image information of yellow (Y), magenta (M), cyan (C), and black (K) for latent image formation. The image processor GS outputs image information after conversion to the writing circuit DL of the printer U 1 . When an image is a single color image, that is monochromatic, the image processor GS outputs image information of only black (K) to the writing circuit DL. 
     The writing circuit DL outputs a control signal corresponding to inputted image information to the exposure devices LHy to LHk. The exposure devices LHy to LHk output writing light corresponding to the control signal. 
     Each of the photoreceptors PRy to PRk is driven to rotate when image formation is started. A charging voltage is applied to the charging rollers CRy to CRk from the power supply circuit E. Consequently, surfaces of the photoreceptors PRy to PRk are charged by the charging rollers CRy to CRk. In the writing regions Q 1   y  to Q 1   k , latent images are formed on surfaces of the charged photoreceptors PRy to PRk by the exposure devices LHy to LHk. In the developing regions Q 2   y  to Q 2   k , the latent images on the photoreceptors PRy to PRk are developed into toner images as one example of an image by the developing devices Gy to Gk. 
     The developed toner images are transported to the primary transfer regions Q 3   y  to Q 3   k  in contact with the intermediate transfer belt B as one example of an intermediate transfer body. In the primary transfer regions Q 3   y  to Q 3   k , a primary transfer voltage having a polarity opposite to a charge polarity of toner is applied from the power supply circuit E to the primary transfer rollers T 1   y  to T 1   k . Consequently, the toner images on the photoreceptors PRy to PRk are transferred onto the intermediate transfer belt B by the primary transfer rollers T 1   y  to T 1   k . In the case of multicolor toner images, a toner image transferred on the intermediate transfer belt B in the primary transfer region on the upstream side is overlaid with a toner image on the downstream side. 
     Residues and deposits on the photoreceptors PRy to PRk after primary transfer are removed by the photoreceptor cleaners CLy to CLk. The surfaces of the cleaned photoreceptors PRy to PRk are recharged by the charging rollers CRy to CRk. 
     A single-color or multi-color toner image transferred on the intermediate transfer belt B by the primary transfer rollers T 1   y  to T 1   k  in the primary transfer regions Q 3   y  to Q 3   k  is transported to the secondary transfer region Q 4 . 
     The recording paper S on which an image is to be recorded is taken out by the pickup roller Rp of the paper-feeding tray TR 1  or TR 2  that is to be used. When multiple sheets of the recording paper S are taken out in a stacked state by the pickup roller Rp, the sheets of the recording paper S are separated to be individual sheets by the handling roller Rs. The recording paper S separated by the handling roller Rs is transported in the paper-feeding path SH 1  by the transport rollers Ra. The recording paper S transported in the paper-feeding path SH 1  is sent to the registration roller Rr. The recording paper S stacked on the manual feeding tray TR 0  is also sent to the paper-feeding path SH 1  through the manual paper-feeding path SH 0  by the pickup roller Rp 0 . 
     The registration roller Rr transports the recording paper S to the secondary transfer region Q 4  at a timing when a toner image formed on the intermediate transfer belt B is transported to the secondary transfer region Q 4 . A secondary transfer voltage having a polarity opposite to a charge polarity of toner is applied to the secondary transfer roller T 2   b  by the power supply circuit E. Consequently, the toner image on the intermediate transfer belt B is transferred from the intermediate transfer belt B onto the recording paper S. 
     Deposits and the like adhered to the surface of the intermediate transfer belt B after secondary transfer are removed by the belt cleaner CLb. 
     The recording paper S on which the toner image is secondarily transferred is heated and fixed when passing through the fixation region Q 5 . 
     To discharge the recording paper S on which an image is fixed onto the lower paper output tray TRh, the gate GT 1  moves to the first guide position. Consequently, the recording paper S sent from the fixing device F is transported in the paper output path SH 3 . The recording paper S transported in the paper output path SH 3  is discharged onto the lower paper output tray TRh by the paper output roller Rh. 
     To discharge the recording paper S onto the upper paper output tray TRh 2 , the gate GT 1  moves to the second guide position so that the recording paper S is discharged onto the upper paper output tray TRh 2 . 
     When the recording paper S is to be subjected to double-sided printing, the gate GT 1  moves to the second guide position. When the rear end of the recording paper S has passed through the gate GT 1 , the gate GT 1  moves to the first guide position, and the reversing roller Rb rotates reversely. Consequently, the recording paper S is guided by the gate GT 1  to be sent to the reversing path SH 6 . 
     Explanatory Views of Frame Body 
       FIG.  2    is an explanatory view of a frame body part of the image forming apparatus according to Example 1. 
       FIG.  3    is an explanatory view of an airflow in a narrowed space part according to Example 1. 
       FIGS.  4 A and  4 B  are explanatory views of wall members according to Example 1.  FIG.  4 A  is an explanatory view of a first wall member, and  FIG.  4 B  is an explanatory view of a second wall member. 
     In  FIG.  2   , the copier U according to Example 1 includes an upper frame body  1  in which the image recorders Uy to Uk+T 1 +T 2 +B, the fixing device F, and the like are housed, and a lower frame body  2  in which the paper-feeding trays TR 1  and TR 2  and the like are housed. 
     The upper frame body  1  includes upper vertical frames  11  to  14  as one example of a vertical frame body disposed in correspondence with the positions of four corners at the front, rear, left, and right. The upper vertical frames  11  to  14  extend in the up-down direction. A front lateral frame  16 F as one example of a lateral frame body is supported between a lower portion of the upper vertical frame  11  on the left front side and a lower end portion of the upper vertical frame  12  on the right front side. A right lateral frame  17  as one example of a lateral frame body is supported between the upper vertical frame  12  on the right front side and the upper vertical frame  14  on the right rear side. A rear lateral frame  16 R is supported between the upper vertical frame  13  on the left rear side and the upper vertical frame  14  on the right rear side. Although illustration and description are omitted, a lateral frame body is supported also between the upper vertical frame  11  on the left front side and the upper vertical frame  13  on the left rear side. 
     Between the upper vertical frame  12  on the right front side and the upper vertical frame  14  on the right rear side, an upper tie bar  18  as one example of a first wall member is supported below the right lateral frame  17 . The upper tie bar  18  is configured by a plate-shaped metal member, that is, a sheet metal. In  FIG.  4 A , the upper tie bar  18  has upper punched holes  18   a  as one example of a first ventilation part. The upper punched holes  18   a  each have a round hole shape, and multiple upper punched holes  18   a  are disposed to be spaced from each other in the front-rear direction. The upper punched holes  18   a  in Example 1 are formed in a width that is longer than the widths of circuit boards ( 57   a  to  57   c ), which will be described later, in the front-rear direction. 
     As one example of a first inclined portion, a plate-shaped bottom plate  19  is disposed at a lower portion of the upper frame body  1 . The plate-shaped bottom plate  19  is supported between the front and rear lateral frames  16 F and  16 R. The bottom plate  19  according to Example 1 is disposed to be inclined upward from the left side (the other side surface of the body of the image forming apparatus) toward the right side (one side surface) in accordance with the inclination angle θ 1  at which the intermediate transfer belt B and the photoreceptors PRy to PRk are disposed. In addition, a high-voltage power supply board  20  as one example of a circuit board is supported on the upper side of the bottom plate  19 . 
     Lower vertical frames  41  to  44  as one example of a vertical frame body are disposed at the lower frame body  2  in correspondence with the upper vertical frames  11  to  14 . The lower vertical frames  41  to  44  extend in the up-down direction. A front lower frame  46  as one example of a lateral frame body is supported between an upper end portion of the lower vertical frame  41  on the left front side and an upper end portion of the lower vertical frame  42  on the right front side. In addition, a right lower frame  47  as one example of a lateral frame body is supported between the lower vertical frame  42  on the right front side and the lower vertical frame  44  on the right rear side. Although detailed description is omitted, lateral frame bodies are also supported at lower end portions between the lower vertical frame  41  on the left front side and the lower vertical frame  43  on the left rear side and between the lower vertical frame  43  on the left rear side and the lower vertical frame  44  on the right rear side. 
     Between the lower vertical frame  42  on the right front side and the lower vertical frame  44  on the right rear side, a lower tie bar  48  as one example of a second wall member is supported above the right lower frame  47 . The lower tie bar  48  is configured by a plate-shaped metal member, that is, a sheet metal. In  FIG.  4 B , the lower tie bar  48  has lower punched holes  48   a  as one example of a second ventilation part. Similarly to the upper punched holes  18   a , multiple lower punched holes  48   a  are disposed to be spaced from each other in the front-rear direction and formed in a width that is longer than the widths of the circuit boards ( 57   a  to  57   c ), which will be described later, in the front-rear direction. 
     As one example of a second inclined portion, a plate-shaped ceiling plate  49  is disposed at an upper portion of the lower frame body  2 . The ceiling plate  49  is supported by the front lower frame  46 , the lower vertical frame  42  on the right front side, the lower vertical frame  44  on the right rear side, and the like. The ceiling plate  49  according to Example 1 is disposed to be inclined upward toward the left in accordance with the inclination angle θ 2  of the first paper-feeding tray TR 1 . The left end (inner end) of the ceiling plate  49  extends toward the left end of the bottom plate  19 . 
     Therefore, a space  51  surrounded by the bottom plate  19  and the ceiling plate  49  is formed in the inside of the copier U according to Example 1. The space  51  has a shape in which a width in the up-down direction is narrowed from the right toward the left. Therefore, the space  51  is a space having a shape that is narrowed from the right toward the far side (left side). In other words, the space  51  is configured by a V-shaped space as viewed from the front. 
     An openable covering  52  that is able to open and close the inside of the space  51  is disposed at the right end of the space  51 . The openable covering  52  thus closes and opens an opening  51   a  surrounded by the tie bars  18  and  48 , the vertical frames  12  and  42  on the right front side, and the vertical frames  14  and  44  on the right rear side. In Example 1, the openable covering  52  does not have the punched holes  18   a  and  48   a.    
     A mounting frame  56  as one example of a mounting member is supported on the upper side of the ceiling plate  49 . The mounting frame  56  includes three front-rear pairs (only the front side is illustrated in  FIG.  2    and  FIG.  3   ) of mounting frames that are disposed to be spaced from each other in the left-right direction. The length in the up-down direction of a mounting frame  56   a  on the right side is longer in correspondence with the right portion of the space  51  than the length in the up-down direction of a mounting frame  56   b  at a center portion, and the length in the up-down direction of a mounting frame  56   c  on the left side is shorter than the length in the up-down direction of the mounting frame  56   b.    
     A substrate  57   a  as one example of a first cooled part is detachably mounted to the mounting frame  56   a  on the right side (the nearest side). A fixing substrate  57   b  as one example of a second cooled part is detachably mounted to the mounting frame  56   b  at a center portion. A print server substrate  57   c  as one example of a third cooled part is detachably mounted to the mounting frame  56   c  on the left side (the farthest side). Each of the substrates  57   a  to  57   c  is configured by a plate-shaped substrate and is mounted in a state of extending in the up-down direction. The upper and lower ends of each of the substrates  57   a  to  57   c  are disposed to be spaced (with a gap) from the bottom plate  19  and the ceiling plate  49 . 
     In Example 1, among the substrates  57   a  to  57   c , the print server substrate  57   c  on the far side is configured to have the smallest area, and the substrate  57   a  on the near side is configured to have the largest area. In Example 1, among the substrates  57   a  to  57   c , the substrate  57   a  generates the largest amount of heat and is configured by a substrate for which necessity of cooling may be highest, and the print server substrate  57   c  is configured by a substrate for which necessity of cooling may be lowest. 
     Operation in Example 1 
     In the copier U according to Example 1 having the configuration, it may be possible to attach and detach the substrates  57   a  to  57   c  in the inside of the copier U with the openable covering  52  opened. When the copier U is operated in a state in which the substrates  57   a  to  57   c  are mounted with the openable covering  52  closed, each of the substrates  57   a  to  57   c  generates heat in response to energization. When the air in the space  51  rises by being heated when heat is generated, the air is guided along the bottom surface of the bottom plate  19  toward the right upper side and is discharged through the upper punched holes  18   a . Along with gas discharging through the upper punched holes  18   a , outside air flows into the space  51  from the outside through the lower punched holes  48   a . The outside air that has flowed into the space  51  is guided leftward along the ceiling plate  49 , flows into gaps between substrates  57   a  to  57   c , and cools the substrates  57   a  to  57   c . Therefore, the outside air that has flowed into the space  51  may be able to flow as indicated by the broken line with arrow in  FIG.  3    along the space narrowed toward the far side and cool the space  51  up to the far side where the space  51  is narrowed. 
     In particular, in a configuration in which the multiple substrates  57   a  to  57   c  are disposed and in which the space is not narrowed toward the far side, as in the configuration described in Japanese Unexamined Patent Application Publication No. 2011-107478, only the substrate  57   a  on the nearest side may be easily cooled, and it may be not easy to cause an airflow to flow to the substrates  57   b  and  57   c , which are far from the openable covering  52 , and may be difficult to cool the substrates  57   b  and  57   c . To cope with this, in the configuration in Example 1, the space  51  is narrowed toward the far side. In other words, in Example 1, the wall (the ceiling plate  49 ) on the lower side of the space  51  is inclined upward toward the far side, and the wall (the bottom plate  19 ) on the upper side of the space  51  is inclined downward toward the far side. 
     In particular, in Example 1, the substrates  57   a  to  57   c  are disposed in the up-down direction, the space  51  is partitioned by the substrates  57   a  to  57   c , and air may be easily guided along the substrates  57   a  to  57   c . Therefore, compared with a case in which the substrates  57   a  to  57   c  are arranged in the horizontal direction, air may flow smoothly, and cooling efficiency may be improved. 
     In addition, in Example 1, the multiple substrates  57   a  to  57   c  are housed in the space  51 , and the space  51  may be effectively used compared with a case in which only one substrate is housed in the space  51 . 
     Further, in Example 1, among the multiple substrates  57   a  to  57   c , the substrate  57   a  for which necessity of cooling may be highest is disposed on the outer side (the side of the opening  51   a ), that is, at a position near the lower punched holes  48   a . Thus, after cool outside air has flowed into the space  51 , the temperature of the air is increased on the way to the far side of the space  51 . Therefore, the temperature of the air is lower and cooling efficiency may be higher toward the outer side. 
     In addition, in Example 1, in the front-rear direction, which is the width direction of the multiple substrates  57   a  to  57   c , the punched holes  18   a  and  48   a  are formed in a width longer than the widths of the substrates  57   a  to  57   c , in other words, to the outer side of the widths. 
     In addition, in Example 1, the round-hole-shaped punched holes  18   a  and  48   a  are formed as one example of a ventilation part. A ventilation part having a slit shape or a rectangular hole shape may be employed. 
     In Example 1, a transporting part, for example, a fan, a blower, or the like, that transports a gas in the space  51  is not provided. Therefore, manufacturing costs and power consumption may be reduced compared with a case in which a fan or the like is used. A transporting part, such as a fan, a blower, or the like, for discharging a gas whose temperature is increased from the space  51  and introducing outside air into the space  51  may be provided. When a fan, a blower, or the like is provided, cooling performance may be stabilized by the amount of a gas transported by the fan or the like. A fan or the like may be disposed at both the upper punched holes  18   a  and the lower punched holes  48   a  or may be disposed at one of the upper punched holes  18   a  and the lower punched holes  48   a . In a case of disposing a fan or the like at one of the upper punched holes  18   a  and the lower punched holes  48   a , it may be efficient to set the fan or the like in correspondence with the upper punched holes  18   a  since an inside gas whose temperature is increased may be easily discharged. 
     Modifications 
     Examples according to the present disclosure have been described above in detail. The present disclosure is, however, not limited to the examples and may be variously changed within the scope of the gist of the present disclosure described in the claims. Modifications (H01) to (H04) of the present disclosure will be exemplified below. 
     (H01) In the examples, the copier U as one example of an image forming apparatus is exemplified. The present disclosure is, however, not limited thereto and is applicable to a facsimile machine and applicable to a complex machine or the like having multiple functions of a facsimile machine, a printer, a copier, and the like. In addition, the present disclosure is not limited to a multicolor-development image forming apparatus and may be configured by a single-color, that is, monochromatic image forming apparatus. 
     (H02) In the examples, the exemplified specific numerical values may be changed, as appropriate, in accordance with changes in design and specifications. Therefore, when ease of adhering of paper dust to the intermediate transfer belt B changes depending on the material of the surface of the intermediate transfer belt, the inclination angle θ 1  of the intermediate transfer belt B may be also changed in accordance with the change. In addition, the inclination angle θ 2  of the first paper-feeding tray TR 1  may be also changed, as appropriate, in accordance with the maximum size of usable recording paper S and the lateral width of the copier U. 
     (H03) In the examples, a case in which the intermediate transfer belt B is used as an image holding part is exemplified. The present disclosure is, however, not limited thereto. The present disclosure is also applicable to a case in which an image holding part like a photoreceptor belt is used. 
     (H04) In the examples, a configuration in which the substrates  57   a  to  57   c  as one example of a cooled part are attachable and detachable one by one is exemplified. The configuration is, however, not limited thereto. The configuration may be changed optionally to, for example, a configuration in which the three substrates  57   a  to  57   c  are attachable and detachable collectively (integrally) or a configuration in which the two substrates  57   b  and  57   c  on the far side are attachable and detachable collectively, and the like. The number of the substrates may be also changed to two or less, or four or more. 
     The foregoing description of the exemplary embodiments of the present disclosure has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, thereby enabling others skilled in the art to understand the disclosure for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the disclosure be defined by the following claims and their equivalents.