JP6575465B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus, and more particularly to a technique for suppressing discharge of foreign matter generated when a recording sheet passes through a fixing unit to the outside of the apparatus main body.

  In a general image forming apparatus, a step of charging an image carrier such as a photoconductor, a step of exposing to form an electrostatic latent image on the image carrier, and supplying toner to the electrostatic latent image. Then, a step of forming a toner image, a step of transferring the formed toner image to the recording paper, and a step of fixing the toner image to the recording paper by heat and pressure are executed.

  By the way, there is a problem that foreign matter such as volatile organic compounds (VOC) generated when the recording paper passes through the fixing unit is discharged to the outside of the main body of the apparatus. .

  In recent years, for the purpose of energy saving, a toner capable of being fixed at a temperature lower than that of a conventional toner has been developed and put into practical use. Ultra-fine particles called “Ultra-Fine Particles” having a particle diameter of less than 100 nm are likely to volatilize.

  When the UFP is discharged outside the apparatus main body, there is a risk of causing problems such as unpleasant odor and contamination of the office environment. Therefore, it is necessary to suppress discharge of this type of foreign matter to the outside of the apparatus main body. For example, in Patent Document 1 below, an opening / closing mechanism is provided at an exhaust port for exhausting air in the vicinity of the fixing unit, and the temperature in the vicinity of the fixing unit is determined. It is described that the exhaust port is narrowed when the temperature becomes high. In Patent Document 2 below, the air in the vicinity of the fixing unit is sucked into the exhaust duct by a fan, and the air is filtered by the uneven filter provided in the exhaust duct. It describes that foreign matter inside is collected.

JP 2013-195562 A Japanese Patent Laying-Open No. 2015-022275

  However, the technique described in Patent Document 1 has a problem that the configuration and the control thereof are complicated. In the technique described in Patent Document 2, the gap between the fixing unit and the recording paper discharge port is provided. There is a problem that the floating UFP cannot be collected efficiently, and the UFP that could not be collected is discharged from the recording paper discharge port to the outside of the apparatus main body.

  The present invention has been made in view of the above circumstances, and efficiently collects foreign matter such as UFP discharged from the recording paper discharge port to the outside of the apparatus main body into the apparatus main body without complicating the configuration. Objective.

  An image forming apparatus according to an aspect of the present invention includes a fixing unit that fixes a toner image on a recording sheet, and a recording sheet discharge port that discharges the recording sheet on the downstream side in the conveyance direction of the recording sheet with respect to the fixing unit. An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed and disposed in a body portion of the apparatus body of the image forming apparatus; and a body portion of the apparatus body In the discharge direction of the recording from the recording paper discharge port, the front surface side of the apparatus main body is formed and the mounting surface and the opening that opens the upper part thereof are formed. A first vertical wall extending from the first end portion of the placement surface on the upstream side to the lower end portion of the recording paper discharge port upward in the vertical direction, and opposed to the opening portion, the device rear of the placement surface. The side edge extends from the side end of the side in the vertical direction, and the side edge is the first vertical wall A second vertical wall to be connected; a first vent formed on the second vertical wall facing the in-body tray; and communicating the in-body tray and the inside of the apparatus main body; from the first vent A fan that takes in air in the in-body tray into the inside of the apparatus main body, and the recording sheet discharge port causes the recording sheet to be discharged in the width direction of the recording sheet perpendicular to the discharging direction. The shape is such that the recording sheet is dropped onto the mounting surface before the recording paper edge on the opening side, which is the front side of the apparatus main body, than the second vertical wall side, which is the side.

  According to the present invention, the recording paper discharged from the recording paper discharge port has an opening on the front side of the apparatus rather than on the second vertical wall side on the rear side of the apparatus in the width direction of the recording paper orthogonal to the discharge direction. The edge of the front side of the recording paper is in contact with the placement surface, but the edge on the non-opening side is above the placement surface. It can be left in the state.

  That is, since the recording paper is inclined downward from the second vertical wall side on the apparatus rear side toward the opening side on the apparatus front side, the first vertical wall, the second vertical wall, and the placement surface And the recording paper of the said attitude | position can be made into the state which closed the space above the mounting surface in an opening part.

  As a result, air containing foreign matter such as UFP discharged from the recording paper discharge port together with the recording paper on which the toner image is formed can be retained in the closed space. Then, the air in the closed space can be taken into the apparatus main body from the first ventilation port by the fan. Therefore, foreign matter such as UFP once discharged from the recording paper discharge port to the outside of the apparatus main body can be efficiently collected inside the apparatus main body without adopting a complicated configuration.

1 is a perspective view illustrating an appearance of an image forming apparatus according to a first embodiment of the present invention. 2 is a transmission plan view of the image forming apparatus. FIG. 2 is a transparent left side view of the image forming apparatus. FIG. 2 is a transparent front view of the image forming apparatus. FIG. FIG. 3 is a schematic perspective view illustrating an in-body tray, a recording paper discharge port, and a peripheral portion thereof. FIG. 6 is a perspective view illustrating a state in which recording paper is discharged from a recording paper discharge port. FIG. 3 is a schematic perspective view illustrating an in-body tray, a recording paper discharge port, and a peripheral portion thereof. 2 is a transparent left side view of the image forming apparatus. FIG.

  Embodiments of an image forming apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an appearance of the image forming apparatus according to the first embodiment of the present invention. FIG. 2A is a transparent plan view of the image forming apparatus. FIG. 2B is a transparent left side view of the image forming apparatus. FIG. 2C is a transparent front view of the image forming apparatus.

  The image forming apparatus 1 is a multifunction machine having a plurality of functions such as a copy function, a printer function, a scanner function, and a facsimile function, for example, and includes a document feeding unit 2, a document reading unit 3, The image forming unit 4, the in-body tray 5, and the operation unit 6 are included.

  The document feeding unit 2 feeds a document to be read to the document reading unit 3. The document reading unit 3 reads image data from the document by irradiating the document using a light irradiation unit (not shown) and receiving the reflected light. The image forming unit 4 forms a toner image on a recording sheet based on the image data read by the document reading unit 3. The in-body tray 5 is disposed in the body portion of the apparatus main body 11 and places the recording paper discharged from the apparatus main body 11.

  The operation unit 6 receives instructions such as an image forming operation execution instruction and a document reading operation execution instruction from the operator regarding various operations and processes that can be executed by the image forming apparatus 1. The operation unit 6 includes a display unit 61 that displays operation guidance for the operator. The display unit 61 is a touch panel, and an operator can operate the image forming apparatus 1 by touching buttons and keys displayed on the screen.

  The toner image formed on the recording paper P by the image forming unit 4 (FIG. 1) is fixed by the fixing unit 21, and the recording paper P subjected to the fixing process is downstream in the conveyance direction A <b> 1 of the recording paper P with respect to the fixing unit 21. From the recording paper discharge port 41 on the side where the recording paper P is discharged, the paper is discharged to the in-body tray 5 by the discharge roller pair 31 and placed on the placement surface 15 of the in-body tray 5.

  The fixing unit 21 fixes the toner image on the recording paper P by thermocompression bonding, and includes a heat roller 211 incorporating a heater 212 and a pressure roller 213. The heat roller 211 and the pressure roller 213 form a pair, and when the recording paper P is nipped and conveyed between the heat roller 211 and the pressure roller 213, the unfixed toner image is melted by the heat of the heater 212. Then, the recording paper P is fixed by the pressure of the heat roller 211 and the pressure roller 213.

  In the body portion of the apparatus main body 11, the user puts the recording paper P placed on the placement surface 15 of the in-body tray 5 opened in the discharge direction A2 of the recording paper P discharged from the recording paper discharge port 41. An opening 110 for taking out is formed. The opening 110 includes a mounting surface 15 and is formed in the body portion of the apparatus main body 11. The opening 110 opens the front side of the apparatus main body 11 and opens the mounting surface 15 and the upper part thereof.

  Further, a first vertical wall extending from the first end 151 of the loading surface 15 on the upstream side in the discharge direction A2 to the lower end of the recording paper discharge port 41 upward in the vertical direction is provided on the body portion of the apparatus main body 11. 111 and a second vertical wall 112 facing the opening 110 and extending vertically upward from the second end 152 of the mounting surface 15 and being connected to the first vertical wall 111 at a right angle. . The second vertical wall 112 faces the opening 110 and extends upward in the vertical direction from the side end of the placement surface 15 on the apparatus rear side. Further, the second vertical wall 112 has a side edge portion 1121 connected to the first vertical wall 111.

  In the second vertical wall 112, a first vent hole 51 is formed at a lower position on the upstream side in the recording sheet conveyance direction which is the discharge direction A2. The first vent 51 communicates the in-body tray 5 with the inside of the apparatus main body 11. The first vent 51 has a large number of through holes 52. An exhaust duct 54 that connects the first ventilation port 51 and the exhaust port 53 is provided inside the apparatus main body 11. A filter 55 and a fan 56 are disposed in the exhaust duct 54. The filter 55 absorbs foreign matter such as UFP. The fan 56 takes in the air in the in-body tray 5 from the first ventilation port 51 into the apparatus main body 11 and sends it out of the apparatus main body 11 through the exhaust port 53.

  FIG. 3 is a schematic perspective view showing the in-body tray 5, the recording paper discharge port 41, and its peripheral portion. On the first vertical wall 111, there is a plate-like support member 71 that protrudes from the lower side of the recording paper discharge port 41 in the discharge direction A2 (FIG. 2) and supports the lower portion of the recording paper P discharged from the recording paper discharge port 41. Is formed.

  The support member 71 extends in the width direction of the recording paper P discharged from the recording paper discharge port 41, and the portion protruding in the discharge direction A2 is the opening 110 than the non-opening side (the second vertical wall 112 side). The side is formed to be shorter. The support member 71 is formed so that the amount of protrusion in the recording paper discharge direction is shorter on the opening 110 side than on the second vertical wall 112 side. In the support member 71, the recording paper P discharged from the recording paper discharge port 41 is placed in the width direction of the recording paper P from the opening 110 side earlier than the non-opening side (second vertical wall 112 side). Drop on surface 15.

  In addition, about the support member 71, it replaces with the structure by which protrusion amount is set in this way, and the part which protrudes in discharge direction A2 is an apparatus front side rather than the non-opening part side (2nd vertical wall 112 side). The same effect as described above can also be achieved by forming a shape having an inclination in which the opening 110 side becomes a lower position.

  FIG. 4 is a perspective view showing a state in which the recording paper P is discharged from the recording paper discharge port 41. The lower part of the recording paper P discharged from the recording paper discharge port 41 is supported by the support member 71 from the front end in the recording paper conveyance direction. The area where the lower part is supported is on the non-opening side (second vertical wall). Since the opening 110 side is smaller than the recording paper P, the recording paper P is loaded in the width direction of the recording paper P from the opening 110 side earlier than the non-opening side (second vertical wall 112 side). It falls on the mounting surface 15. Thereby, the opening 110 side in the width direction of the recording paper P comes into contact with the placement surface 15 first, but the non-opening portion side (second vertical wall 112 side) remains above the placement surface 15. It becomes a state.

  Since the recording paper P discharged from the recording paper discharge port 41 is inclined downward from the non-opening side (second vertical wall 112 side) toward the opening 110 side, the first vertical wall 111 is placed. The space above the placement surface 15 in the opening 110 is closed by the second vertical wall 112, the placement surface 15, and the recording paper P in the posture.

  As a result, the air discharged from the recording paper discharge port 41 together with the recording paper P on which the toner image is formed (containing UFP at a high concentration) can be retained in the closed space. Further, the air in the closed space can be taken into the apparatus main body 11 from the first vent 51 by the fan 56. Therefore, it is possible to efficiently collect foreign matter such as UFP once discharged from the recording paper discharge port 41 to the outside of the apparatus main body 11 inside the apparatus main body 11 without adopting a complicated configuration.

  As described above, the edge of the front side of the apparatus is lowered, and the recording paper P that comes into contact with the placement surface 15 first advances from the recording paper discharge port 41, and the recording paper P is conveyed in the recording paper conveyance direction. When the upstream end is separated from the support member, the recording paper P is in a state in which the edge portion on the front side of the apparatus is in contact with the placement surface, and the other edge portion on the apparatus rear side (the second vertical wall 112 side) Falls on the placement surface 15 below. At this time, the recording paper P gradually comes into contact with the placement surface 15 from the portion around the edge on the front side of the apparatus toward the other edge, and finally the placement surface. 15 is placed in a flat state. Thus, the air in the closed space is guided toward the first vent hole 51 of the second vertical wall 112 by the pressing by the recording paper P accompanying the change in the posture of the recording paper P. For this reason, the air containing foreign substances such as UFP can be accurately taken into the apparatus from the first vent 51.

  The air taken into the apparatus main body 11 from the first vent 51 is exhausted from the exhaust outlet 53 to the outside of the apparatus main body 11 through the filter 55. For this reason, according to the above embodiment, the environment-friendly image forming apparatus 1 can be provided.

  It should be noted that foreign matter such as UFP is discharged from the recording paper discharge port 41 to the outside of the apparatus main body 11 in a state where a large amount of foreign matter such as UFP is present on the toner image forming surface side of the recording paper P. The image forming unit and the recording paper P transport mechanism provided in the apparatus discharge the recording paper P from the recording paper discharge port 41 by face-down with the toner image forming surface being the lower surface.

  In the first embodiment, the recording paper P discharged from the recording paper discharge port 41 is from the non-opening portion side (second vertical wall 112 side) in the width direction of the recording paper P orthogonal to the discharge direction A2. In this case, the support member 71 that supports the recording paper P discharged from the recording paper discharge port 41 from below is adopted as a configuration in which the recording paper P is discharged from the opening 110 side, which is the front side of the apparatus, to the placement surface 15 first. Other configurations may also be employed.

  For example, as shown in FIG. 5, instead of the support member 71, the recording paper P protrudes from the upper side of the recording paper discharge port 41 in the discharge direction A2, and the recording paper P discharged from the recording paper discharge port 41 is obliquely downward in the discharge direction A2. A guide member 81 for guiding is provided. In the guide member 81, the part protruding in the discharge direction A <b> 2 is formed longer on the opening 110 side that is the front side of the apparatus than on the non-opening part side (second vertical wall 112 side). The guide member 81 guides the recording paper P discharged from the recording paper discharge port 41 obliquely downward along the discharge direction. In this case, it is preferable that the image forming unit and the recording paper P transport mechanism provided in the apparatus main body 11 discharge the recording paper P from the recording paper discharge port 41 in a posture facing upward.

  Alternatively, although not particularly illustrated, the guide member 81 has a portion that protrudes in the discharge direction A2 instead of the configuration in which the protruding amount is changed, and the front surface of the apparatus is closer to the non-opening portion side (second vertical wall 112 side). The opening 110 side, which is the side, may be inclined downward.

  Further, instead of or together with the configuration of the support member 71 and the guide member 81, the recording paper discharge port 41 is directed downward from the non-opening portion side (second vertical wall 112 side) toward the opening portion 110 side. The distance from the recording paper discharge port 41 to the placement surface 15 is closer to the front side of the opening 110 than the non-opening side (second vertical wall 112 side). You may take the structure where one becomes short.

  Further, in place of the above-described configurations or together with the above-described configurations, the height of the placement surface 15 of the in-body tray 5 is closer to the front side of the apparatus than the non-opening side (the second vertical wall 112 side). You may employ | adopt the structure formed so that it may become high in the opening part 110 side.

  Furthermore, as another embodiment, as shown in FIG. A configuration may be adopted in which a second vent 85 is formed on the placement surface 15 of the in-body tray 5 to communicate the in-body tray 5 with the inside of the apparatus main body 11. For example, the second vent 85 has a plurality of ducts 851. The plurality of ducts 851 are arranged side by side in the width direction orthogonal to the discharge direction of the recording paper P. The plurality of ducts 851 can take in air above the placement surface 15 through holes formed in the placement surface 15. The plurality of ducts 851 extend in the discharge direction of the recording paper P from the recording paper discharge port 41 from the vicinity of one end portion in the discharge direction of the placement surface 15 to the vicinity of the other end portion. The plurality of ducts 851 are coupled to each other at at least one end in the length direction. The second vent 85 is connected to the exhaust duct 54 and is closed by the first vertical wall 111, the second vertical wall 112, the placement surface 15, and the recording paper P in the posture, and the placement surface 15 in the opening 110. The air trapped in the space above is also taken into the apparatus main body 11 from the mounting surface 15 side. Thereby, the air containing foreign substances, such as UFP, can be taken in into the device main body 11 more effectively. This configuration is adopted in place of or together with the arrangement of the first vent 51, the exhaust 53, and the exhaust duct 54 described above.

  As described above with reference to each embodiment, in the image forming apparatus 1 according to an embodiment of the present invention, the recording paper discharge port 41 causes the recording paper P to be discharged to be perpendicular to the recording paper discharge direction. In the width direction of P, from the edge of the recording paper P on the opening 110 side which is the front side of the image forming apparatus 1 and the apparatus main body 11 rather than the second vertical wall 112 side which is the apparatus rear side of the image forming apparatus 1. It is made into the shape dropped on the mounting surface 15 first. In order to make the recording paper discharge port 41 in such a shape, the support member 71 or the guide member 81 is disposed in the recording paper discharge port 41, or the shape of the recording paper discharge port 41 itself is inclined. The above-described configurations can be adopted.

  In the above embodiment, the configuration and processing shown in the above embodiment with reference to FIGS. 1 to 6 are only one embodiment of the present invention, and the present invention is not limited to the configuration and processing.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 5 In-body tray 11 Apparatus main body 15 Loading surface 21 Fixing part 41 Recording paper discharge port 51 1st ventilation port 54 Exhaust duct 55 Filter 56 Fan 71 Support member 110 Opening part 111 1st vertical wall 112 2nd vertical Wall 151 First end 152 Second end

Claims (10)

A fixing unit for fixing the toner image on the recording paper;
A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface ,
A support member that protrudes from the lower side of the recording paper discharge port in the discharge direction and supports a lower portion of the recording paper discharged from the recording paper discharge port;
The image forming apparatus , wherein the support member is formed such that a protruding amount in the discharge direction is shorter on the opening side than on the second vertical wall side . A fixing unit for fixing the toner image on the recording paper;
A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface,
A support member that protrudes from the lower side of the recording paper discharge port in the discharge direction and supports a lower portion of the recording paper discharged from the recording paper discharge port;
Wherein the support member, images forming apparatus that towards the opening side of the second longitudinal wall side having a low slope. A fixing unit for fixing the toner image on the recording paper;
A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface,
A guide member that projects in the discharge direction from above the recording paper discharge port and guides the recording paper discharged from the recording paper discharge port obliquely downward along the discharge direction;
The guide member, the amount of projection of the discharge direction, the second longitudinal wall side images forming device that has been formed larger in the opening portion side than. A fixing unit for fixing the toner image on the recording paper;
A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface,
A guide member that protrudes from above the recording paper discharge port in the discharge direction and guides the recording paper discharged from the recording paper discharge port diagonally downward in the discharge direction;
The guide member is images forming apparatus that towards the opening side of the second longitudinal wall side having a low slope. An exhaust duct for exhausting air taken into the apparatus body from the first vent to the outside of the apparatus body;
A filter provided in the exhaust duct,
The image forming apparatus according to any one of the exhaust within the duct according fan is disposed claims 1 to 4. To the mounting surface, an image forming apparatus according to any one of the cylinders in the tray and the apparatus main body according to claim interior and a second vent for communicating are formed 1 to claim 5. A fixing unit for fixing the toner image on the recording paper;
A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface,
To the placement surface, the body tray and the apparatus main body inner and images forming device second vent for communicating is that has been formed a.   A fixing unit for fixing the toner image on the recording paper;
  A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
  An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
  Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
  A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
  A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
  A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
  A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
  The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface,
  The height of the placing surface of the in-body tray is formed higher on the opening side than on the second vertical wall side,
  2. An image forming apparatus according to claim 1, wherein a second ventilation hole for communicating the in-body tray and the inside of the apparatus main body is formed on the mounting surface.   A fixing unit for fixing the toner image on the recording paper;
  A recording paper discharge port for discharging the recording paper on the downstream side in the conveyance direction of the recording paper with respect to the fixing unit;
  An in-cylinder tray having a placement surface on which the recording paper discharged from the recording paper discharge port is placed, and disposed in a body portion of the apparatus main body of the image forming apparatus;
  Formed in the body portion of the apparatus main body, opening the front side of the apparatus main body, and opening the mounting surface and the upper portion thereof,
  A lower end of the recording paper discharge port that forms a part of the apparatus main body and extends vertically upward from the first end of the mounting surface that is upstream in the discharge direction of the recording paper from the recording paper discharge port. A first vertical wall extending to the section;
  A second vertical wall facing the opening, extending vertically upward from a side end on the apparatus rear side of the mounting surface, and having a side edge connected to the first vertical wall;
  A first ventilation port formed in the second vertical wall facing the in-body tray and communicating the in-body tray and the inside of the apparatus main body;
  A fan that takes air in the in-body tray from the first vent into the inside of the apparatus body,
  The recording paper discharge port is configured so that the recording paper to be discharged is closer to the front side of the apparatus main body than the second vertical wall side which is the apparatus rear side in the width direction of the recording paper perpendicular to the discharging direction. First, from the edge of the recording paper on the opening side, the shape to be dropped on the mounting surface,
  The recording paper discharge port has a shape inclined downward from the second vertical wall side toward the opening side,
  2. An image forming apparatus according to claim 1, wherein a second ventilation hole for communicating the in-body tray and the inside of the apparatus main body is formed on the mounting surface.   The image forming apparatus according to claim 1, wherein the recording paper is discharged from the recording paper discharge port by face-down with a toner image forming surface being a lower surface.