JP5950891B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  Patent Document 1 discloses an image forming apparatus in which an image forming chamber in which a photosensitive drum and an exposure device are arranged and a heat fixing chamber are partitioned by a partition plate. In this image forming apparatus, the fan attached to the partition plate rotates forward and backward. For example, if the image forming chamber is lower than the desired temperature, the air heated in the heat fixing chamber is supplied to the image forming chamber, and if the image forming chamber is higher than the desired temperature, the air is heated in the image forming chamber. The air is exhausted to the heat fixing chamber. As a result, the temperature of the air inside the image forming chamber is maintained at a desired temperature.

Japanese Patent Laid-Open No. 9-237027

  However, even if the image forming chamber and the thermal fixing chamber are separated by the partition plate, it is necessary to transport the recording material from the image forming chamber to the thermal fixing chamber in order to thermally fix the recording material on which the image is not fixed. There is. Therefore, it is necessary to form an opening for delivering the recording material to the partition plate.

  Due to this opening, the hot air that has moved from the image forming chamber to the heat fixing chamber may be further heated in the heat fixing chamber and return to the image forming chamber through the opening of the partition plate. As a result, the internal temperature of the image forming chamber rises to change the electrical characteristics of each component, or a large positional shift may occur between the components in accordance with the temperature change of the usage environment.

  In addition, when the opening of the image forming chamber and the opening of the heat fixing chamber are close to each other, or depending on the pressure relationship near the opening of each other, heat in the heat fixing chamber may flow into the image forming chamber. .

  The present invention relates to a configuration in which a first casing having an image forming unit and a second casing having a fixing unit are arranged adjacent to each other, and the amount of heat of air flowing from the second casing to the first casing. An object of the present invention is to provide an image forming apparatus in which the temperature rise of the components inside the first housing is reduced.

In order to achieve the above object, an image forming apparatus of the present invention fixes an image forming unit that forms an image on a recording material, a first housing that covers the image forming unit, and an image formed on the recording material. A fixing unit; a second casing disposed next to the first casing and covering the fixing unit; and the first casing for conveying the recording material from the first casing to the second casing. A first opening provided in the body, and a second opening provided in the second case for conveying the recording material from the first case to the second case and facing the first opening. And a first air supply means for supplying air from the outside of the first housing to the inside, and provided from the inside of the first housing to the outside of the first housing At least one of the first exhaust means for exhausting is provided in the first casing, and air is supplied from the outside to the inside of the second casing. And second exhaust means for exhausting from the inside of the second casing to the outside at a position of the second casing that is not opposed to the first opening and the first air supplying section. At least one of them is provided in the second casing, and the first casing and the second casing are communicated with the atmosphere through the first and second openings. When the absolute pressure of the atmospheric static pressure is P [Pa (abs)] and the absolute pressure of the wind pressure of the air in the second opening of the second housing is P2 [Pa (abs)], at least image formation During operation, the relationship of P2 <P is established so that the inside of the second casing has a negative pressure .

Another image forming apparatus of the present invention includes an image forming unit that forms an image on a recording material, a first housing that covers the image forming unit, a fixing unit that fixes an image formed on the recording material, A second casing disposed next to the first casing and covering the fixing unit; and provided in the first casing for conveying the recording material from the first casing to the second casing. A first opening, a second opening provided in the second housing for conveying the recording material from the first housing to the second housing, and facing the first opening, And a first air supply means for supplying air from the outside of the first housing to the inside, and a first air provided in the first housing and exhausting from the inside of the first housing to the outside At least one of the exhaust means is provided in the first housing, and the second air supply means for supplying air from the outside to the inside of the second housing And at least one of second exhaust means for exhausting the interior of the second housing from the inside to the outside at a position of the second housing that is not opposed to the first opening and the first air supply means. Is provided in the second casing, and the first casing and the second casing communicate with the atmosphere through the first and second openings, and the first opening is connected to the first casing. 1 air volume V'1 passing from the inside of the housing to the outside ^[m 3 / min], and the air volume V'2 passing through the second opening from the inside of the second housing to the outside ^[m 3 / min] When the area of the first opening is S1 [m ² ] and the area of the second opening is S2 [m ² ], at least during the image forming operation, V′1 / S1> V′2 / S2 is established , the supply air volume of the first air supply means is V1 [m ³ / min], and the first exhaust means V1 [m ³ / min], the air supply amount of the second air supply means is V2 [m ³ / min], and the air volume of the second exhaust means is v2 [m ³ / min]. In some cases, V1> v1 and V2> v2, wherein a filter is disposed in the air path of the first air supply means, and a filter is disposed in the air path of the second air supply means.
Another image forming apparatus of the present invention includes an image forming unit that forms an image on a recording material, a first housing that covers the image forming unit, a fixing unit that fixes an image formed on the recording material, A second casing disposed next to the first casing and covering the fixing unit; and provided in the first casing for conveying the recording material from the first casing to the second casing. A first opening, a second opening provided in the second housing for conveying the recording material from the first housing to the second housing, and facing the first opening, And a first air supply means for supplying air from the outside of the first housing to the inside, and a first air provided in the first housing and exhausting from the inside of the first housing to the outside At least one of the exhaust means is provided in the first casing, and is provided in the second casing and is provided from the outside of the second casing to the inside. And a second air supply means for supplying air to the first housing and a position of the second housing not facing the first opening and the first air supply means. At least one of the two exhaust means is provided in the second casing, and the first casing and the second casing are communicated with the atmosphere through the first and second openings. When the supply air volume of the second supply means is V2 [m ³ / min] and the exhaust air volume of the second exhaust means is v2 [m ³ / min], V2−v2 <0. The relationship is established.

  According to the present invention, in the configuration in which the first casing and the second casing are arranged adjacent to each other, the amount of heat of air flowing from the second casing to the first casing is reduced, and the first casing is reduced. The temperature rise of the parts inside the body is reduced.

1 is a cross-sectional view of an image forming apparatus according to Embodiment 1 of the present invention. 1 is a perspective view of an image forming apparatus. It is a perspective view of a 1st housing | casing unit. It is a perspective view of the 2nd case unit. It is sectional drawing which shows the cooling process inside a 1st housing | casing unit and a 2nd housing | casing unit. It is sectional drawing which shows the cooling process inside the 1st housing | casing unit which concerns on Example 2, and a 2nd housing | casing unit. It is sectional drawing which shows the cooling process inside the 1st housing | casing unit which concerns on Example 3, and a 2nd housing | casing unit.

(Image formation and fixing on recording materials)
FIG. 1 is a cross-sectional view schematically showing a schematic configuration of an image forming apparatus 1 that combines a first casing unit 100 and a second casing unit 200 according to the present invention to form a final configuration. The image forming apparatus 1 is configured to be separable into a first housing unit 100 and a second housing unit 200 mainly for the purpose of improving the convenience of delivery and installation to the user.

  The first housing unit 100 includes a first housing 110, an image forming unit G for forming an image, and a first transport unit 130 that transports the recording material P in the first housing unit 100. . The first housing 110 includes a first frame body 111 and a first exterior part 112. The image forming unit G that forms an image on the recording material P includes an image forming station 120, an intermediate transfer body 140, and a transfer unit 150. The image forming unit G is covered with the first housing 110. The image forming unit G, the first transport unit 130, and the first exterior unit 112 are supported by the first frame body 111.

  The second housing unit 200 includes a second housing 210, a fixing device 220 that fixes an unfixed image formed on the recording material P, and a second transport that transports the recording material P in the second housing unit 200. Part 230. The second housing 210 is disposed next to the first housing 110 and covers the fixing device 220. The second housing 210 includes a second frame body 211 and a second exterior part 212. The fixing device 220 includes a first fixing device 221 and a second fixing device 222. The fixing device 220 and the second transport unit 230 are disposed inside the second housing 210. The fixing device 220, the second transport unit 230, and the second exterior unit 212 are supported by the second frame body 211.

  In the image forming apparatus of this example, a plurality (four) of the image forming stations 120 are juxtaposed along the moving direction of the intermediate transfer body 140, so that the image forming speed can be increased. . One of the plurality of image forming stations 120 will be specifically described, but the configuration of each image forming station 120 is the same.

  The image forming station 120 disposed in the first housing 110 includes a photosensitive drum 123 (electrophotographic photosensitive drum), a charging device 127, an exposure unit 125, a developing device 124, and transfer units 150 and 160. The photoconductor drum 123 is a drum on which the photoconductor is disposed. The charging device 127 is a device that charges the surface of the photosensitive drum 123 to a desired potential. The exposure unit 125 is a part that exposes the surface of the photosensitive drum 123 charged by the charging device 127 to form an electrostatic image.

  The developing device 124 is a device that develops the electrostatic image on the surface of the photosensitive drum 123 with toner as a developer to form a developer image. The transfer unit 160 (primary transfer unit) is a part that transfers the developer image formed on the surface of the photosensitive drum 123 to the intermediate transfer member 140. The transfer unit 150 (secondary transfer unit) is a recording material P (resin recording material typified by paper or OHP) that is transported by the first transport unit 130 to the developer image transferred to the intermediate transfer body 140. ) To be transcribed. A hopper portion 126 is disposed on the upper portion of the first housing 110. The hopper 126 is a container for storing developer supplied to the developing device 124.

  The recording material feeding unit 131 feeds the recording material P. The first belt conveyance unit 132 conveys the recording material P after transfer to the second housing unit 200 side. The second belt conveyance unit 133 conveys the recording material P on which the unfixed image transferred on the first casing unit 100 side is loaded to the second casing unit 200 side.

  A fixing device 220 is disposed inside the second housing 210. The fixing device 220 as “fixing means” fixes the image formed on the recording material P. The fixing device 220 includes a first fixing device 221 and a second fixing device 222. The first fixing device 221 is a device that fixes the developer image on the recording material P with respect to the recording material P on which the developer image has been transferred inside the first housing unit 100. The first fixing device 221 has a pair of rollers in which a heater (not shown) is incorporated, and fixes an unfixed developer image on the recording material P by heat and pressure. A transport path 231 that connects the first fixing device 221 and the second fixing device 222 is disposed between the first fixing device 221 and the second fixing device 222.

  The second fixing device 222 is a device for controlling the gloss of the recording material P on which the developer image is fixed to achieve high image quality. The second fixing device 222 has a pair of rollers in which a heater (not shown) is incorporated, and further fixes the fixed image on the recording material P by heat and pressure.

  The refeed conveyance path 232 is a path for conveying and guiding the recording material P to the image forming unit G again when images are formed on both sides of the recording material P. The reversing path 233 is a path that reverses the recording material P re-fed by the re-feed conveyance path 232. The double-sided path 234 is a path for conveying the recording material P reversed by the reversing path 233 to the developing device 124.

  Among the configurations described above, the transport unit that transports the recording material P from the first housing 110 to the second housing 210 includes the first transport unit 130, the first belt transport unit 132, and the second belt transport unit 133. This corresponds to the transport path 231. In particular, the second belt conveyance unit 133 is relevant in the present invention as the conveyance unit. Further, as the conveyance unit for transporting the recording material P from the second housing 210 to the first housing 110, the double-sided path 234, the outer paper discharge path 235, and the like correspond to the configuration described above. In particular, a double-sided path 234 is relevant in the present invention as the transport unit.

  The bottle 240 is a container for storing toner collected from a cleaning device that cleans the developing device 124, the photosensitive drum 123, and the intermediate transfer member 140. The recording material P for which image formation has been completed is discharged out of the apparatus through the external discharge path 235. The casters 161 are coupled to the first frame body 111 and support the first housing unit 100. The casters 261 are coupled to the second frame 211 and support the second casing unit 200.

(Appearance of combined image forming apparatus)
FIG. 2 is a perspective view of the appearance of the image forming apparatus of the present example in a state where the first housing unit 100 and the second housing unit 200 are coupled. The first housing unit 100 is in contact with the ground via a first caster 161 and a first adjuster 162 provided in the first frame 111. The second housing unit 200 is in contact with the ground via a caster 261 and an adjuster 262 provided in the second frame 211.

  The first housing unit 100 and the second housing unit 200 are configured such that they can be aligned in the height direction by adjusting the first adjuster 162 and the second adjuster 262 with each other. Further, the first casing unit 100 and the second casing unit 200 are positioned in the horizontal direction of each other unit by a positioning pin (not shown), and fixed to each other by a fixing member (not shown). .

(Appearance of first housing unit and second housing unit)
FIG. 3 is a perspective view showing the appearance of the first housing unit 100. (A) corresponds to the front surface, and (b) corresponds to the back surface. A first upper opening 171 for passing the recording material P to the second casing unit 200 is formed on the upper left side of the first exterior portion 112. A first lower opening 172 for receiving the recording material P from the second housing unit 200 is formed below the left side surface of the first exterior portion 112.

  Further, on the front surface and the back surface of the first exterior portion 112, a first air for taking in air outside the image forming apparatus 1 into the first housing 110 or discharging air inside the first housing 110. One front opening 173 and a first back opening 174 are formed. And it is comprised so that the inside and outside air of the 1st housing | casing 110 can be replaced | exchanged using the fan which is not shown in figure as needed.

  FIG. 4 is a perspective view showing the appearance of the second housing unit 200. (A) corresponds to the front surface, and (b) corresponds to the back surface. A second upper opening 271 for receiving the recording material P from the first casing unit 100 is formed on the upper right side of the second exterior portion 212. A second lower opening 272 for passing the recording material P to the first housing unit 100 is formed below the right side surface of the second exterior portion 212.

  In addition, on the front surface and the back surface of the second exterior portion 212, air for taking air outside the image forming apparatus 1 into the second housing 210 or discharging air inside the second housing 210 is provided. 2 front opening 273 and second back opening 274 are formed. And it is comprised so that the air inside and outside of the 2nd housing | casing 210 is exchangeable using the fan which is not shown in figure as needed.

  For the convenience of transporting the recording material P, the positions of the first upper opening 171 and the second upper opening 271 are provided at substantially the same height and substantially the same horizontal position of the opposing exterior surfaces. Similarly, the first lower opening 172 and the second lower opening 272 are also provided at substantially the same height and substantially the same horizontal position on the opposing exterior surfaces.

(Schematic diagram of the coupling state of the image forming apparatus)
FIG. 5 is a diagram schematically illustrating a cooling configuration of the image forming apparatus 1 in which the first housing unit 100 and the second housing unit 200 are coupled. The first casing unit 100 and the second casing unit 200 are positioned close to each other with a fixed space 300 by a positioning pin (not shown), and are fixed by a fixing member (not shown). The space 300 is defined between the first housing 110 and the second housing 210 and communicates with the atmosphere.

  As described above, the first housing 110 separates the air inside and outside the first housing unit 100. The first upper opening 171 and the first lower opening 172 as “first openings” are formed on the surface of the first housing 110 facing the second housing 210 and the space 300. Two openings are formed here, but at least one opening may be provided. In the first housing 110, air can be exchanged with the space 300 through the first upper opening 171 and the first lower opening 172, and further through the first front opening 173 and the first rear opening 174, the image forming apparatus 1. It is possible to communicate with the outside air.

  A first air supply fan 181 is provided inside the first front opening 173. A first air supply fan 181 as “first air supply means” (first air supply / exhaust means) is provided in the first housing 110 and supplies air from the outside to the inside of the first housing 110. The pressure [Pa] described hereinafter is defined as an absolute pressure based on the wind pressure or static pressure and based on the absolute vacuum, and the atmospheric pressure is defined as P [Pa].

  A first exhaust fan 182 is provided inside the first back opening 174. A first exhaust fan 182 as a “first exhaust unit” (first supply / exhaust unit) is provided in the first casing 110 and exhausts from the inside of the first casing 110 to the outside. Here, both the first air supply fan 181 and the first exhaust fan 182 are provided. However, if at least one of them is provided, the structure can function.

  The wind pressure can be measured by a wind pressure sensor. Specifically, the wind pressure P1 of the air leaking from the inside to the outside in the first opening (171, 172) in the first housing 110 or leaking from the outside to the inside is the same as the first upper opening 171 and the first. It is measured in the vicinity of the lower opening 172 (described later).

  The second housing 210 separates the air inside and outside the second housing unit 200. The second upper opening 271 and the second lower opening 272 as “second openings” are formed on the surface of the second casing 210 facing the first casing 110 and the space 300. Two openings are formed here, but at least one opening may be provided. In the second casing 210, air can be exchanged with the space 300 through the second upper opening 271 and the second lower opening 272, and the image forming apparatus 1 is further transmitted through the second front opening 273 and the second rear opening 274. It is possible to communicate with the outside air.

  A second air supply fan 281 is provided inside the second front opening 273. A second air supply fan 281 as “second air supply means” (second air supply / exhaust means) is provided in the second housing 210 and supplies air from the outside to the inside of the second housing 210.

  A second exhaust fan 282 is provided inside the second back opening 274. The second exhaust fan 282 as “second exhaust means” (second air supply / exhaust means) is provided in the second casing 210 and exhausts from the inside of the second casing 210 to the outside. Here, both the second air supply fan 281 and the second exhaust fan 282 are provided. However, if at least one of these is provided, the configuration can function.

  Specifically, the wind pressure P2 of the air that leaks from the inside to the outside in the second opening (273, 274) in the second housing 210 or leaks from the outside to the inside is, specifically, the second upper opening 271 and the second air pressure P2. It is measured in the vicinity of the lower opening 272 (described later).

  The first supply fan 181, the first exhaust fan 182, the second supply fan 281 and the second exhaust fan 282 described above supply and exhaust air so that P1> P2> P. . These fans are set to always operate during image formation. Specifically, when the operation of the first fixing device 221 and the second fixing device 222 is started, those fans are operated. Then, when the operations of the first fixing device 221 and the second fixing device 222 are stopped, or after a predetermined time has passed, the fans are stopped. For this reason, the fan may be operated at least during the image forming operation.

  The pressure difference between the inside and outside of the fan is the number of fans, the type of fan, the number of fan wings rotating, the size of the airway opening area, the size of the airway pressure loss due to the length of the airway, etc. It is determined by a combination of known means and can be set as required by the designer. Hereinafter, the combination of the air volume of supply and exhaust and the flow of the wind will be described.

(When P1> P and P2> P)
FIG. 5 schematically shows the wind flow in the case of P2 <P1, and P1> P and P2> P. The flow of air inside and outside the first housing 110 is P1> P. Therefore, a part of the air supplied from the first front opening 173 by the first supply fan 181 is exhausted from the first rear opening 174 by the first exhaust fan 182, and the remaining air is discharged from the first upper opening 171 and the first air. The air is exhausted through the lower opening 172 into the space 300 opened to the atmosphere.

  The wind pressure sensor J1 protrudes downward from the upper side of the first upper opening 171. The wind pressure sensor J1 measures the wind pressure P11 of air in the first upper opening 171 leaked from the first upper opening 171. The wind pressure sensor J2 protrudes upward from the lower side of the first lower opening 172. The wind pressure sensor J2 measures the wind pressure P12 of air in the first lower opening 172 leaked from the second lower opening 172. Therefore, the wind pressure P1 = (P11 + P12) / 2 of the air leaked from the opening inside the first housing 110 is obtained.

  The flow of air inside and outside the second housing 210 is P2> P. Therefore, a part of the air supplied from the second front opening 273 by the second air supply fan 281 is exhausted from the second rear opening 274 by the second exhaust fan 282, and the remaining air is supplied from the second upper opening 271 and the second air. The air is exhausted through the lower opening 272 into the space 300 released to the atmosphere.

  The wind pressure sensor K1 protrudes downward from the upper side of the second upper opening 271. The wind pressure sensor K1 measures the wind pressure P21 of air in the second upper opening 271 leaked from the second upper opening 271. The wind pressure sensor K2 protrudes upward from the lower side of the second lower opening 272. The wind pressure sensor K2 measures the wind pressure P22 of air in the second lower opening 272 leaked from the second lower opening 272. From this, the wind pressure P2 = (P21 + P22) / 2 of the leaked air at the opening inside the second housing 210 is obtained.

  Accordingly, air in the vicinity of the first fixing device 221 and the second fixing device 222 heated to a high temperature to fix the image and heated in the second casing 210 is passed through the first upper opening 171 and the first fixing device. 1 Blocked by exhaust from the lower opening 172. Then, the air is released to the outside air through the space 300 and the second back surface opening 274 without entering the inside of the first housing 110.

  Further, here, the pressure in the first housing 110 and the pressure in the second housing 210 are set to be larger than the atmospheric pressure. Therefore, even if air is discharged out of the image forming apparatus 1 from an unintended gap of the first casing 110 or the second casing 210, air outside the image forming apparatus 1 is not sucked. Therefore, the air intake port of the first housing 110 is limited to the first front opening 173 on the upstream side of the first air supply fan 181. The air intake port of the second housing 210 is limited to the second front opening 273 on the upstream side of the second air supply fan 281.

  Note that P1 or P2 when air is discharged from the unintended gap to the outside of the image forming apparatus 1 is strictly a pressure measured in the vicinity of the unintended gap in the housing. Therefore, the pressure may be different from the pressure measured in the vicinity of the first upper opening 171 and the first lower opening 172 or in the vicinity of the second upper opening 271 and the second lower opening 272. In any case, P1> P and The condition of P2> P is satisfied.

  Therefore, particularly when the air outside the image forming apparatus is contaminated with dust, the first dust filter 191 and the second dust filter 291 are provided in the first front opening 173 and the second front opening 273. That is, the first dust filter 191 is disposed in the first front opening 173 serving as the air path of the first air supply fan 181, and the second dust filter 291 is disposed in the second front opening 273 serving as the air path of the second air supply fan 281. Is placed. As a result, dust from outside air can be efficiently collected, and malfunction of the image forming apparatus due to dust can be more suitably prevented.

  In this example, it is essential that the conditions of P1> P and P2> P are satisfied. Even when the number of the first supply fan is 1 or more and the number of the second supply fan is 1 or more, the first exhaust fan is further provided. This is also true when the second exhaust fan is 0 or more.

  Hereinafter, as Example 2, a case where P2 <P1 and P1 <P and P2 <P will be described. In addition, about the structure same as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(When P1 <P and P2 <P)
FIG. 6 schematically shows the air flow and the flow of air when P1 <P and P2 <P.

  The flow of air inside and outside the first housing 110 is as follows. Outside air is supplied from the first front opening 173 into the first housing 110 by the first air supply fan 181. At the same time, the air in the first housing 110 is exhausted from the first back opening 174 by the first exhaust fan 182. Further, since P1 <P, air is sucked from the space 300 through the first upper opening 171 and the first lower opening 172, and the air in the first housing 110 from the first rear opening 174 by the first exhaust fan 182. Is exhausted.

  The aforementioned wind pressure sensor J1 measures the wind pressure P11 of the air in the first upper opening 171 leaked from the first upper opening 171. The aforementioned wind pressure sensor J2 measures the wind pressure P12 of the air in the second lower opening 172 leaked from the second lower opening 172. From this, the wind pressure P1 = (P11 + P12) / 2 of the leaked air at the opening inside the first housing 110 is obtained.

  The flow of air inside and outside the second housing 210 is as follows. Outside air is supplied from the second front opening 273 into the second housing 210 by the second air supply fan 281. At the same time, the air in the second housing 210 is exhausted from the second rear opening 274 by the second exhaust fan 282. Furthermore, since P2 <P, air is sucked from the space 300 through the second upper opening 271 and the second lower opening 272, and the second exhaust fan 282 causes the air in the second housing 210 to be discharged from the second rear opening 274. Is exhausted.

  The aforementioned wind pressure sensor K1 measures the wind pressure P21 of the air leaked from the second upper opening 271. The aforementioned wind pressure sensor K2 measures the wind pressure P22 of the air leaked from the second lower opening 272. From this, the wind pressure P2 = (P21 + P22) / 2 of the air leaked in the opening inside the second housing 210 is obtained.

  The first supply fan 181, the first exhaust fan 182, the second supply fan 281, and the second exhaust fan 282 described above supply and exhaust air so that P2 <P.

  As described above, the air in the heated second casing 210 passes through the vicinity of the first fixing device 221 and the second fixing device 222 heated to a high temperature to fix the image. Without entering the inside of the body 110, the air is released to the outside air through the second back opening 274.

  In this configuration, since P1 <P and P2 <P are set, it is not possible to inhale air outside the image forming apparatus 1 from an unintended gap in the first casing 110 or the second casing 210. Even if it exists, air is not discharged out of the image forming apparatus 1. Therefore, the air outlet of the first housing 110 is limited to the first back opening 174. Further, the air outlet of the second casing 210 is limited to the second back opening 274.

  Note that P1 or P2 when air outside the image forming apparatus 1 is sucked from an unintended gap is strictly a pressure measured in the vicinity of the unintended gap in the housing. Therefore, the pressure may be different from the pressure measured in the vicinity of the first upper opening 171 and the first lower opening 172 or in the vicinity of the second upper opening 271 and the second lower opening 272. In any case, P1 <P and The condition of P2 <P is satisfied.

  In the present embodiment, the second air supply fan in the second casing 210 is configured such that an air flow is generated from the outside of the second casing 210 through the second upper opening 271 and the second lower opening 272 in the second casing 210. The air volume of 281 and the second exhaust fan 282 is adjusted. That is, the air supply amount of the second air supply fan 281 per unit time is smaller than the air discharge amount of the second exhaust fan 282 so that the second housing has a negative pressure relationship. With this relationship, the warmed airflow of the second casing 210 can be made difficult to flow to the first casing 110.

  When VOC, ozone, or the like is generated in the image forming process or image fixing process in the first housing and the second housing, the first VOC filter 192 and the second VOC are formed in the first back opening 174 and the second back opening 274, respectively. A filter 292 is provided. That is, the first VOC filter 192 is disposed in the first back opening 174 as the air path of the first exhaust fan 182, and the second VOC filter 292 is disposed in the second back opening 274 as the air path of the second exhaust fan 282. . Thus, the air in the image forming apparatus can be efficiently cleaned and discharged outside the apparatus.

  In this example, it is essential that the conditions of P1 <P and P2 <P are satisfied. Even when the first supply fan is 0 or more and the second supply fan is 0 or more, the second exhaust fan is further provided. This is also true for the case where is 1 or more and the second exhaust fan is 1 or more.

  Hereinafter, a case where P1> P and P2 <P will be described as a third embodiment. In addition, about the structure same as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(When P1> P and P2 <P)
FIG. 7 schematically shows the air volume and the air flow when P1> P and P2 <P.

  The flow of air inside and outside the first housing 110 is P1> P. Therefore, a part of the air supplied from the first front opening 173 by the first supply fan 181 is exhausted from the first rear opening 174 by the first exhaust fan 182, and the remaining air is discharged from the first upper opening 171 and the first air. The air is exhausted through the lower opening 172 into the space 300 released to the atmosphere.

  The aforementioned wind pressure sensor J1 measures the wind pressure P11 of the air in the first upper opening 171 leaked from the first upper opening 171. The aforementioned wind pressure sensor J2 measures the wind pressure P12 of air in the first lower opening 172 leaked from the second lower opening 172. Therefore, the wind pressure P1 = (P11 + P12) / 2 of the air leaked from the opening inside the first housing 110 is obtained.

  The flow of air inside and outside the second housing 210 is as follows. Outside air is supplied from the second front opening 273 into the second housing 210 by the second air supply fan 281. At the same time, the air in the second housing 210 is exhausted from the second rear opening 274 by the second exhaust fan 282. Furthermore, since P2 <P, air is sucked from the space 300 through the second upper opening 271 and the second lower opening 272, and the second exhaust fan 282 causes the air in the second housing 210 to be discharged from the second rear opening 274. Is exhausted.

  The aforementioned wind pressure sensor K1 measures the wind pressure P21 of air in the second upper opening 271 leaked from the second upper opening 271. The aforementioned wind pressure sensor K2 measures the wind pressure P22 of air in the second lower opening 272 that leaks from the second lower opening 272. From this, the wind pressure P2 = (P21 + P22) / 2 of the air leaked in the opening inside the second housing 210 is obtained.

  The first supply fan 181, the first exhaust fan 182, the second supply fan 281, and the second exhaust fan 282 described above supply and exhaust air so that P2 <P.

  As described above, the air in the second casing 210 heated through the vicinity of the first fixing device 221 and the second fixing device 222 heated to a high temperature for fixing an image is transferred to the first casing. Without entering the interior of 110, the air is released to the outside air through the second rear opening 274.

  Further, in this configuration, the air intake port of the first housing 110 is limited to the first front opening 173. Therefore, especially when the air outside the image forming apparatus is contaminated with dust, the first dust filter 191 is disposed in the first front opening 173 as the air path of the first air supply fan 181. This makes it possible to efficiently collect dust from the outside air. In particular, it is possible to suitably prevent malfunction of the exposure unit in the first housing 110 that is easily affected by dust.

  Further, in this configuration, the air outlet of the second housing 210 is limited to the second back opening 274. Accordingly, the second VOC filter 292 is disposed in the second back opening 274 as the air path of the second exhaust fan 282. As a result, in the air discharged from the second casing 210, VOC or the like often generated from the vicinity of a particularly high-temperature fixing device can be efficiently cleaned and discharged outside the apparatus.

  In this example, it is essential that the conditions of P1> P and P2 <P are satisfied. Even when the first supply fan is 1 or more and the second supply fan is 0 or more, the second exhaust fan is further provided. This is also true for the case where is 0 or more and the second exhaust fan is 1 or more.

  Example 4 will be described below. In addition, about the structure same as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

A first air supply fan 181 is provided inside the first front opening 173 and configured to supply air outside the image forming apparatus 1 into the first housing 110 with an air volume V1 [m ³ / min]. Has been. A first exhaust fan 182 is provided inside the first rear opening 174 and is configured to exhaust the air inside the first housing 110 to the outside of the image forming apparatus 1 with an air volume v1 [m ³ / min]. Yes.

  The first housing 110 can communicate with air outside the image forming apparatus 1 through the first front opening 173 and the first rear opening 174. In addition, the first housing 110 separates the air inside and outside, but can exchange air with the space 300 through the second upper opening 171 and the second lower opening 172.

  The wind speed sensor L1 protrudes from the left side of the first front opening 173 toward the right side. The wind speed sensor L1 measures the wind speed X11 of the air supplied from the first front opening 173. If the cross-sectional area of the first front opening 173 is Y11, the supply air volume V1 supplied from the first front opening 173 is V1 = X11 × Y11.

  The wind speed sensor L2 protrudes from the left side of the first back opening 174 toward the right side. This wind speed sensor L2 measures the wind speed X12 of the air exhausted from the second back opening 174. Assuming that the cross-sectional area of the second back surface opening 174 is Y12, the exhaust air volume v1 exhausted from the second back surface opening 174 is equal to X12 × Y12.

A second air supply fan 281 is provided inside the second front opening 273 and is configured to supply air outside the image forming apparatus 1 into the second housing 210 with an air volume V2 [m ³ / min]. Has been. A second exhaust fan 282 is provided inside the second rear opening 274 and is configured to exhaust the air inside the second housing 210 to the outside of the image forming apparatus 1 with an air volume v2 [m ³ / min]. ing.

  The second housing 210 can communicate with air outside the image forming apparatus 1 through the second front opening 273 and the second rear opening 274. The second casing 210 separates the air inside and outside, but can exchange air with the space 300 through the second upper opening 271 and the second lower opening 272.

  The wind speed sensor M1 protrudes from the right side of the second front opening 273 toward the left. The wind speed sensor M1 measures the wind speed X21 of the air supplied from the second front opening 273. Assuming that the cross-sectional area of the second front opening 273 is Y21, the supply air amount V2 supplied from the second front opening 273 is V2 = X21 × Y21.

  The wind speed sensor M2 protrudes from the right side of the second back opening 274 toward the left. This wind speed sensor M2 measures the wind speed X22 of the air exhausted from the second back opening 274. Assuming that the cross-sectional area of the second back opening 274 is Y22, the exhaust air volume v2 = X22 × Y22 exhausted from the second back opening 274.

The air volume V′1 [m ³ / min] passing through the first upper opening 171 and the first lower opening 172 from the inside to the outside of the first housing 110, and the second upper opening 271 and the second lower opening 272 through the first 2 Assume that the air volume V′2 [m ³ / min] that passes from the inside to the outside of the housing 210. Further, an area obtained by adding the first upper opening 171 and the first lower opening 172 is S1 [m ² ], and an area adding the second upper opening 271 and the second lower opening 272 is S2 [m ² ]. To do. In such a case, the relationship of V′1 / S1,> V′2 / S2 is established.

  The fan air volume is the number of fans, the type of fan, the rotation speed of the fan blades, the opening area of the duct upstream and downstream of the fan, and the pressure loss of the air path upstream and downstream of the fan due to the length of the duct, etc. It is determined by a combination of known means and can be set as required by the designer. Hereinafter, the combination of the air volume of supply and exhaust and the flow of the wind will be described.

(When V1> v1 and V2> v2)
FIG. 5 schematically shows the air volume and the flow of air when V1> v1 and V2> v2.

  The flow of air inside and outside the first housing 110 is V1> v1. Therefore, a part of the air supplied from the first front opening 173 by the first supply fan 181 is exhausted from the first rear opening 174 by the first exhaust fan 182, and the remaining air is discharged from the first upper opening 171 and the first air. The air is exhausted through the lower opening 172 into the space 300 released to the atmosphere.

  The flow of air inside and outside the second housing 210 is V2> v2. Therefore, a part of the air supplied from the second front opening 273 by the second air supply fan 281 is exhausted from the second rear opening 274 by the second exhaust fan 282, and the remaining air is supplied from the second upper opening 271 and the second air. The air is exhausted through the lower opening 272 into the space 300 released to the atmosphere.

  Accordingly, air in the vicinity of the first fixing device 221 and the second fixing device 222 heated to a high temperature to fix the image and heated in the second casing 210 is passed through the first upper opening 171 and the first fixing device. 1 It is obstructed by the exhaust from the lower opening 172. Then, the air is released to the outside air through the space 300 and the second back surface opening 274 without entering the inside of the first housing 110.

  Further, in this configuration, since the supply air volume is set excessively with respect to the exhaust air volume, air is discharged outside the image forming apparatus 1 from an unintended gap of the first casing 110 or the second casing 210. However, the air outside the image forming apparatus 1 is not sucked. Therefore, the air intake port of the first housing 110 is limited to the first front opening 173 on the upstream side of the first air supply fan 181. The air intake port of the second housing 210 is limited to the second front opening 273 on the upstream side of the second air supply fan 281.

  Therefore, particularly when the air outside the image forming apparatus is contaminated with dust, the first dust filter 191 and the second dust filter 291 are provided in the first front opening 173 and the second front opening 273. That is, the first dust filter 191 is disposed in the first front opening 173 serving as the air path of the first air supply fan 181, and the second dust filter 291 is disposed in the second front opening 273 serving as the air path of the second air supply fan 281. Is placed. This makes it possible to efficiently collect dust from the outside air. As a result, it is possible to more suitably prevent malfunction of the image forming apparatus due to dust.

  In this example, it is essential to satisfy the conditions of V1> v1 and V2> v2 with respect to the total amount of supply airflow and exhaust airflow. Therefore, even when the first supply fan is 1 or more and the second supply fan is 1 or more, the second exhaust fan is 0 or more and the second exhaust fan is 0 or more.

  Hereinafter, a case where V1 <v1 and V2 <v2 will be described as the fifth embodiment. In addition, about the structure same as Example 4, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(When V1 <v1 and V2 <v2)
FIG. 6 schematically shows the air volume and the air flow when V1 <v1 and V2 <v2. Here again, the air volume V′1 [m ³ / min] passing through the first upper opening 171 and the first lower opening 172 from the inside to the outside of the first housing 110, the second upper opening 271 and the second lower opening An air volume V′2 [m ³ / min] passing through the side opening 272 from the inside to the outside of the second housing 210 is set. Further, an area obtained by adding the first upper opening 171 and the first lower opening 172 is S1 [m ² ], and an area adding the second upper opening 271 and the second lower opening 272 is S2 [m ² ]. To do. In such a case, the relationship V′1 / S1> V′2 / S2 is established.

  Since the flow of air inside and outside the first housing 110 is V1 <v1, the air supplied from the first front opening 173 by the first air supply fan 181 passes through the first back opening 174 by the first exhaust fan 182. Exhausted. Further, air is sucked from the space 300 through the first upper opening 171 and the first lower opening 172, and is exhausted from the first rear opening 174 by the first exhaust fan 182.

  Since the flow of air inside and outside the second casing 210 is V2 <v2, the air supplied from the second front opening 273 by the second air supply fan 281 passes through the second rear opening 274 by the second exhaust fan 282. Exhausted. Further, air is sucked from the space 300 through the second upper opening 271 and the second lower opening 272, and is exhausted from the second rear opening 274 by the second exhaust fan 282.

Here, when the supply air volume of the second supply fan 281 is V2 [m ³ / min] and the exhaust air volume of the second exhaust fan 282 is v2 [m ³ / min], V2−v2 <0, The relationship is established.

  Therefore, air in the vicinity of the first fixing device 221 and the second fixing device 222 heated to a high temperature for fixing the image and heated in the second housing 210 is transferred to the interior of the first housing 110. The air is discharged to the outside air through the second back opening 274 without entering the air.

  In this configuration, since the exhaust air volume is set excessively with respect to the supply air volume, air outside the image forming apparatus 1 is sucked from an unintended gap in the first housing 110 or the second housing 210. Even if it does, air is not discharged out of the image forming apparatus 1. Therefore, the air outlet of the first housing 110 is limited to the first back opening 174. Further, the air outlet of the second casing 210 is limited to the second back opening 274.

  Accordingly, when VOC, ozone, or the like is generated in the first housing and the second housing during the image forming process or the image fixing process, the first VOC filter 192 and the first back opening 174 and the second back opening 274 are provided. A second VOC filter 292 is provided. That is, the first VOC filter 192 is disposed in the first rear opening 174 as the air path of the first exhaust fan 182, and the second VOC filter 292 is disposed in the air path of the second exhaust fan 282 and the second rear opening 274. As a result, the air in the image forming apparatus 1 can be efficiently cleaned and discharged outside the apparatus.

  In this example, it is essential to satisfy the conditions of V1 <v1 and V2 <v2 with respect to the total amount of supply airflow and exhaust airflow. When the first supply fan is 0 or more and the second supply fan is 0 or more This is also true if the second exhaust fan is 1 or more and the second exhaust fan is 1 or more.

  Hereinafter, a case where V1> v1 and V2 <v2 will be described as the sixth embodiment. In addition, about the structure same as Example 4, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(When V1> v1 and V2 <v2)
FIG. 7 schematically shows the air volume and the flow of air when V1> v1 and V2 <v2. Here again, the air volume V′1 [m ³ / min] passing through the first upper opening 171 and the first lower opening 172 from the inside to the outside of the first housing 110, the second upper opening 271 and the second lower opening An air volume V′2 [m ³ / min] passing through the side opening 272 from the inside to the outside of the second housing 210 is set. Further, an area obtained by adding the first upper opening 171 and the first lower opening 172 is S1 [m ² ], and an area adding the second upper opening 271 and the second lower opening 272 is S2 [m ² ]. To do. In such a case, the relationship V′1 / S1> V′2 / S2 is established.

  The flow of air inside and outside the first housing 110 is V1> v1. Therefore, a part of the air supplied from the first front opening 173 by the first supply fan 181 is exhausted from the first rear opening 174 by the first exhaust fan 182, and the remaining air is discharged from the first upper opening 171 and the first air. The air is exhausted into the space 300 through the lower opening 172.

  Since the flow of air inside and outside the second casing 210 is V2 <v2, the air supplied from the second front opening 273 by the second air supply fan 281 passes through the second rear opening 274 by the second exhaust fan 282. Exhausted. Further, air is sucked from the space 300 through the second upper opening 271 and the second lower opening 272, and is exhausted from the second rear opening 274 by the second exhaust fan 282.

Here, when the supply air volume of the second supply fan 281 is V2 [m ³ / min] and the exhaust air volume of the second exhaust fan 282 is v2 [m ³ / min], V2−v2 <0, The relationship is established.

  Therefore, the air in the second casing 210 that has passed through the vicinity of the first fixing device 221 and the second fixing device 222 heated to high temperatures to fix the image is heated to the inside of the first casing 110. Without being intruded through the second back opening 274.

  Further, in this configuration, the air intake port of the first housing 110 is limited to the first front opening 173. Therefore, especially when the air outside the image forming apparatus is contaminated with dust, the first dust filter 191 is disposed in the first front opening 173 as the air path of the first air supply fan 181. As a result, it is possible to efficiently collect dust from the outside air, and it is possible to suitably prevent malfunction of the exposure unit in the first housing 110 that is particularly susceptible to dust.

  Further, in this configuration, the air outlet of the second housing 210 is limited to the second back opening 274. Accordingly, the second VOC filter 292 is disposed in the second back opening 274 as the air path of the second exhaust fan 282. As a result, in the air discharged from the second casing 210, VOC or the like often generated from the vicinity of a particularly high-temperature fixing device can be efficiently cleaned and discharged outside the apparatus.

  In this example, it is essential to satisfy the conditions of V1> v1 and V2 <v2 with respect to the total amount of supply airflow and exhaust airflow. Therefore, even when the first supply fan is 1 or more and the second supply fan is 0 or more, the second exhaust fan is 0 or more and the second exhaust fan is 1 or more.

  From what has been described in the first to third embodiments, the following can be said. The absolute pressure of the atmospheric static pressure is P [Pa (abs)], the wind pressure in the first openings (171, 172) of the first housing 110 is P1 [Pa (abs)], and the second pressure of the second housing 210 is second. The absolute pressure of the wind pressure at the openings (271, 272) is P2 [Pa (abs)]. In this case, the condition is that P2 <P1.

From what has been described in the fourth to sixth embodiments, the following can be said. Air volume V′1 [m ³ / min] passing through the first opening (171, 172) from the inside to the outside of the first housing 110, and the second opening (271, 272) from the inside to the outside of the second housing 210 The air volume V′2 [m ³ / min] passing through is set, the area of the first opening is S1 [m ² ], and the area of the second opening is S2 [m ² ]. In this case, the condition is that the relationship V′1 / S1> V′2 / S2 is satisfied.

  According to any one of the first to sixth embodiments, in the configuration in which the first casing 110 and the second casing 210 are disposed adjacent to each other, the second casing 210 flows into the first casing 110. The amount of heat of air is reduced, and the temperature rise of components inside the first housing 110 is reduced.

  In the above, Example 1 to Example 6 in the case where there is a difference between the air volume of supply air and exhaust gas has been described. However, if the pressure inside the housing can be made closer to the pressure of the outside air, or the supply and exhaust airflows can be made closer to the same airflow, air movement can occur in openings other than the openings that the fan supplies and exhausts. Further, the movement of heat, dust, VOC, and ozone, which is generated along with the above, can be further reduced.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 110 1st housing | casing 133 2nd belt conveyance part (conveyance part)
171 First upper opening (first opening)
172 First lower opening (first opening)
173 1st front opening (air passage of the 1st air supply means)
174 First rear opening (air passage of first exhaust means)
181 First air supply fan (first air supply means)
182 First exhaust fan (first exhaust means)
211 Second housing 220 Fixing device (fixing means)
234 Double-sided path (conveyance unit)
271 Second upper opening (second opening)
272 Second lower opening (second opening)
273 Second front opening (air passage of second air supply means)
274 Second rear opening (air passage of second exhaust means)
281 Second air supply fan (second air supply means)
282 Second exhaust fan (second exhaust means)
300 Space G Image forming part P Recording material

Claims (8)

An image forming unit for forming an image on a recording material;
A first housing covering the image forming unit;
Fixing means for fixing an image formed on the recording material;
A second housing disposed next to the first housing and covering the fixing means;
A first opening provided in the first casing for conveying a recording material from the first casing to the second casing;
A second opening provided in the second case for conveying the recording material from the first case to the second case, and facing the first opening;
Of the first air supply means for supplying air from the outside to the inside of the first casing, and the first exhaust means for exhausting from the inside of the first casing to the outside provided in the first casing At least one of the first housing and the first housing,
Second air supply means for supplying air from the outside to the inside of the second casing, and the second casing at a position of the second casing that does not face the first opening and the first air supplying means. At least one of the second exhaust means for exhausting from the inside of the body to the outside is provided in the second housing;
The first casing and the second casing are in communication with the atmosphere through the first and second openings,
When the absolute pressure of the atmospheric static pressure is P [Pa (abs)] and the absolute pressure of the wind pressure of the air in the second opening of the second casing is P2 [Pa (abs)], at least the image An image forming apparatus characterized in that a relationship of P2 <P is established so that the inside of the second casing has a negative pressure during the forming operation. The first air supply means is arranged on the front side of the first casing, the first exhaust means is arranged on the back side of the first casing, and the second air supply means is arranged on the front side of the second casing. on the side, the image forming apparatus according to claim 1, wherein the second exhaust means is characterized in that it is arranged on the rear side of the second housing. The absolute pressure of the atmospheric static pressure is P [Pa (abs)], the absolute pressure of the wind pressure of the air in the first opening of the first housing is P1 [Pa (abs)], and the second housing When the absolute pressure of the air pressure of the air in the second opening is P2 [Pa (abs)], at least during the image forming operation, the relationship of P1 <P and P2 <P is satisfied, and the wind of the first exhaust means filter is placed in the road, the image forming apparatus according to claim 1, characterized in that the filter is disposed in the air passage of the second exhaust means. The absolute pressure of the atmospheric static pressure is P [Pa (abs)], the absolute pressure of the wind pressure of the air in the first opening of the first housing is P1 [Pa (abs)], and the second housing When the absolute pressure of the air pressure of the air in the second opening is P2 [Pa (abs)], at least during the image forming operation, P1> P and P2 <P, and the air path of the first air supply means the filter is disposed, the image forming apparatus according to claim 1, characterized in that the filter is disposed in the air passage of the second exhaust means. An image forming unit for forming an image on a recording material;
A first housing covering the image forming unit;
Fixing means for fixing an image formed on the recording material;
A second housing disposed next to the first housing and covering the fixing means;
A first opening provided in the first casing for conveying a recording material from the first casing to the second casing;
A second opening provided in the second case for conveying the recording material from the first case to the second case, and facing the first opening;
Of the first air supply means for supplying air from the outside to the inside of the first casing, and the first exhaust means for exhausting from the inside of the first casing to the outside provided in the first casing At least one of the first housing and the first housing,
Second air supply means for supplying air from the outside to the inside of the second casing, and the second casing at a position of the second casing that does not face the first opening and the first air supplying means. At least one of the second exhaust means for exhausting from the inside of the body to the outside is provided in the second housing;
The first casing and the second casing are in communication with the atmosphere through the first and second openings,
Air volume V′1 [m ³ / min] passing through the first opening from the inside to the outside of the first housing, and air volume V ′ passing through the second opening from the inside to the outside of the second housing. In the case of 2 [m ³ / min], the area of the first opening is S1 [m ² ], and the area of the second opening is S2 [m ² ], at least during the image forming operation, V ′ 1 / S1> V′2 / S2 is established ,
The supply air volume of the first supply means is V1 [m ³ / min], the exhaust air volume of the first exhaust means is v1 [m ³ / min], and the supply air volume of the second supply means is V2 [m ³ / min], and when the exhaust air volume of the second exhaust means is v2 [m ³ / min], V1> v1 and V2> v2, and a filter is disposed in the air path of the first air supply means An image forming apparatus, wherein a filter is disposed in the air path of the second air supply means. An image forming unit for forming an image on a recording material;
A first housing covering the image forming unit;
Fixing means for fixing an image formed on the recording material;
A second housing disposed next to the first housing and covering the fixing means;
A first opening provided in the first casing for conveying a recording material from the first casing to the second casing;
A second opening provided in the second case for conveying the recording material from the first case to the second case, and facing the first opening;
Of the first air supply means for supplying air from the outside to the inside of the first casing, and the first exhaust means for exhausting from the inside of the first casing to the outside provided in the first casing At least one of the first housing and the first housing,
A second air supply means provided in the second housing for supplying air from the outside to the inside of the second housing; and the second air supply means not facing the first opening and the first air supply means. At least one of second exhaust means for exhausting from the inside of the second housing to the outside at the position of the housing is provided in the second housing;
The first casing and the second casing are in communication with the atmosphere through the first and second openings,
When the supply air volume of the second air supply means is V2 [m ³ / min] and the exhaust air volume of the second exhaust means is v2 [m ³ / min], the relationship of V2−v2 <0 is established. An image forming apparatus characterized by being established. The supply air volume of the first supply means is V1 [m ³ / min], the exhaust air volume of the first exhaust means is v1 [m ³ / min], and the supply air volume of the second supply means is V2 [m ³ / min] and the exhaust air volume of the second exhaust means is v2 [m ³ / min], and when V1 <v1 and V2 <v2, a filter is disposed in the air path of the first exhaust means. The image forming apparatus according to claim 6 , wherein a filter is disposed in an air path of the second exhaust unit. The supply air volume of the first supply means is V1 [m ³ / min], the exhaust air volume of the first exhaust means is v1 [m ³ / min], and the supply air volume of the second supply means is V2 [m ³ / min] and the exhaust air volume of the second exhaust means is v2 [m ³ / min], and when V1> v1 and V2 <v2, a filter is provided in the air path of the first air supply means. The image forming apparatus according to claim 6, wherein the image forming apparatus is disposed and a filter is disposed in an air path of the second exhaust unit.

Images