JP5099411B2 - Image forming apparatus and electronic apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus and an electronic apparatus.

  A recording material conveyance path, an image forming means for transferring a toner image formed on the image carrier to a recording material conveyed through the conveyance path by a transfer unit, and the same side as the image carrier as viewed from the conveyance path A fixing device for fixing the developer image transferred to the recording material, which is in pressure contact with the fixing roller, which is a heating element located in the pressure roller, and which passes through the pressing portion of the pair of rollers; In the image forming apparatus, the air flow path is provided between the fixing device and the transfer unit and traverses the conveyance path, and the air flow path is air from the image non-printing surface side to the image printing surface side. There is known an image forming apparatus in which a flow is formed and an air flow moves toward the pressure roller in the fixing device along the non-printing surface side of the recording material when the recording material crosses the ventilation path. (Patent Document 1).

JP 2003-202765 A

  An object of the present invention is to provide an image forming apparatus and an electronic apparatus that can suppress a temperature rise in a main body.

According to a first aspect of the present invention, there is provided an image forming apparatus main body, an image forming unit that is provided in the image forming apparatus main body and that performs image formation, and a first air that flows out of the image forming apparatus main body flows. and the flow path, from the image forming apparatus main body, and a second flow path through which air discharged to interfere with the flow of air discharged from the first flow path, from the second flow path the amount of air discharged per unit time, the so less than the amount of air discharged per unit time from the first flow path, the amount of air flowing through the first flow path and the second and adjusting means for adjusting the amount of air flowing through the second flow path, the possess, said adjusting means includes a conductive plate having a plurality of ribs are formed, space is the first among the plurality of ribs Forming a part of the flow path, and the space is downstream in the airflow direction. And is communicated with the outside through the communication part, and generates a negative pressure in the space by the air flow flowing in the space, and from outside the space through the communication part. By increasing the flow rate of air flowing per unit time of the first flow path by flowing an air flow into the space, and suppressing the flow of air from the upstream side to the downstream side, An image forming apparatus having a suppression unit that suppresses a flow rate of air flowing through the second flow path per unit time .

According to a second aspect of the present invention, the image forming apparatus main body further includes a heat generating portion that generates heat, and the suppressing portion controls a flow rate of air flowing downstream from the heat generating portion of the second flow path. The image forming apparatus according to claim 1, wherein the image forming apparatus is suppressed.

The present invention according to claim 3, wherein the air supply to the first flow path and the second flow path, to generate a flow of air in the first flow path and the second flow path The image forming apparatus according to claim 1 , further comprising a generation device, wherein the second flow path has a flow path length shorter than that of the first flow path.

This onset according to claim 4, wherein the image forming apparatus main body, said discharge port for discharging the air from at least one of the first flow path and said second flow path have been formed, the image forming 4. The apparatus according to claim 1 , further comprising a discharge device that discharges the recording medium on which the image is formed by the unit to the outside of the image forming apparatus main body, and the discharge device discharges the recording medium through the discharge port. This is an image forming apparatus .

This onset according to claim 5, wherein the first flow path and at least one of the second channel is an image forming apparatus according to any one of claims 1 to 4 is used as an air curtain.

According to a sixth aspect of the present invention, there is provided an image forming apparatus main body, an image forming unit that is provided in the image forming apparatus main body, performs image formation, and is provided in the image forming apparatus main body. The first flow path and the second flow path through which the air discharged through the formed discharge section is formed, and the amount of air discharged per unit time from the second flow path are the first flow path and the second flow path . Adjusting means for adjusting the flow rate of air flowing through the first flow path and the amount of air flowing through the second flow path so as to be smaller than the amount of air discharged per unit time from the flow path of The adjusting means has a conductive plate in which a plurality of ribs are formed, and a space between the plurality of ribs forms a part of the first flow path, and the space is an air flow Is formed so as to spread downstream in the flow direction of the Through the outside, and by generating a negative pressure in the space by the air flow flowing in the space, and flowing the air flow into the space from outside the space through the communication portion, The air flowing in the second flow path per unit time by increasing the flow rate of the air flowing in the first flow path per unit time and suppressing the flow of air from the upstream side to the downstream side a suppressor for suppressing unit the flow rate of an image forming apparatus having a.

According to a seventh aspect of the present invention, there is provided an apparatus main body, a first flow path through which air discharged from the apparatus main body flows, and a flow of air discharged from the apparatus main body from the first flow path. The second flow path through which the air discharged so as to interfere and the amount of air discharged from the second flow path per unit time are discharged from the first flow path per unit time. as less than the amount of air, it has a, and adjusting means for adjusting the amount of air flowing through the quantity and the second flow path of the air flowing through the first flow path, said adjusting means comprises a plurality And a space between the plurality of ribs forms a part of the first flow path, and the space is formed so as to spread downstream in the direction of airflow. And communicates with the outside through the communication part and flows in the space. By generating a negative pressure in the space by an air flow and causing an air flow to flow into the space from outside the space via the communication portion, the flow rate of air flowing per unit time of the first flow path is reduced. and increasing portion for increasing, by suppressing the flowing air from upstream to downstream, it is in an electronic device having a suppressing portion for suppressing the flow rate of air flowing per second unit the passage of time .

According to an eighth aspect of the present invention, there are provided a device main body, a first flow path and a second flow provided in the device main body, through which air discharged through the same discharge portion formed in the device main body flows. And the first flow path so that the amount of air discharged per unit time from the second flow path is smaller than the amount of air discharged per unit time from the first flow path . possess an adjustment means for adjusting the amount of air flowing through the quantity and the second flow path of the air flowing through the flow channel, wherein the adjusting means includes a conductive plate having a plurality of ribs are formed, the plurality of A space between the ribs forms a part of the first flow path, and the space is formed so as to expand downstream in the direction in which the airflow flows, and communicates with the outside through the communication portion. A negative pressure is generated in the space by the air flow flowing in the space, and the communication By increasing the flow rate of the air flowing per unit time of the first flow path by flowing an air flow from outside the space into the space through the air, air flows from the upstream side to the downstream side By suppressing this, the electronic device has a suppression unit that suppresses the flow rate of air flowing through the second flow path per unit time .

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an image forming apparatus 10 according to an embodiment of the present invention. The image forming apparatus 10 includes an image forming apparatus main body 12. In the image forming apparatus main body 12, a paper supply device 14, an image forming unit 15, a power supply unit 34 that is one of heat generating units, a control unit 36, and a fixing unit. While the apparatus 30 is mounted, a conveyance path 19 for conveying a sheet used as a recording medium is formed. A discharge port 13 is formed in the image forming apparatus main body 12, and the upper part of the image forming apparatus main body 12 is used as a paper discharge unit 16 that discharges a sheet on which an image has been formed. The image forming apparatus main body 12 is provided with a blower fan 17 used as a generator.

  The image forming unit 15 includes a photoconductor unit 26 used as an image forming unit, an optical writing device 56, and a transfer unit 28, and is used for forming a developer image on a sheet. The photoconductor unit 26 is detachably mounted in the image forming apparatus main body 12 and has a photoconductor unit main body 38. For example, four subunits 50 are provided on the photoconductor unit main body 38 so as to be detachable from the photoconductor unit main body 38, for example.

  Each of the subunits 50 includes a photoreceptor 40 that is used as an image holding member. A charging roll 42 that uniformly charges the photoreceptor 40 is provided around the photoreceptor 40 and is used as a charging unit. The latent image written on the photoconductor 40 is developed with a developer (toner), and light is applied to the developing device 44 used as a developing unit and the photoconductor 40 after the developer image is transferred. A static elimination device 46 used as a static elimination means for neutralizing the photoconductor 40 and a cleaning device 48 used to remove the developer remaining on the photoconductor 40 after the transfer is performed and used as the developer removal means are provided. It has been.

  The four subunits 50 are for yellow developer image formation, magenta developer image formation, cyan developer image formation, and black developer image formation from the upstream in the sheet conveying direction, which is below the gravitational direction. A yellow developer image, a magenta developer image, a cyan developer image, and a black toner image are formed on the surface of the body 40, respectively.

  Each of the optical writing devices 56 is composed of a laser exposure device and is located on the back side of the photosensitive unit 26 and is disposed at a position corresponding to the photosensitive member 40, and is applied to the uniformly charged photosensitive member 40. A latent image is formed by laser irradiation.

  The transfer unit 28 is located on the front side (right side in FIG. 1) of the photoconductor unit 26 and is disposed so as to face the photoconductor unit 26. The transfer unit 28 has two support rolls 58 and 58 arranged in the vertical direction, and a conveyor belt 60 is hung on the two support rolls 58 and 58. At least one of the two support rolls 58, 58 is used as a drive roll that transmits drive to the conveyor belt 60, and the conveyor belt 60 is rotationally driven in response to drive transmission from the drive roll.

  Further, the transfer unit 28 has four transfer rolls 62 arranged to face the photoconductor 40 with the conveyance belt 60 interposed therebetween. A transfer bias is applied to each of the transfer rolls 62, and the developer image formed on the photoreceptor 40 is transferred onto the sheet by the transfer bias.

  The fixing device 30 includes a heating roll 70 having a heat source such as a heater, and a pressure roll 72 pressed against the heating roll 70, and the developer image transferred onto the sheet by the transfer roll 62 is transferred to the heating roll 70. The sheet is heated at the contact portion between the pressure roller 72 and the pressure roll 72, and is fixed on the sheet by applying pressure.

  The paper feeding device 14 has a paper storage container 18, and the paper is stacked and stored in the paper storage container 18. A feed roll 20 is disposed at one upper end of the paper container 18, and a roll 22 is provided facing the feed roll 20. The uppermost sheet in the sheet container 18 is picked up by the feed roll 20, and the sheet is rolled and conveyed by the cooperation of the feed roll 20 and the cutting roll 22.

  The conveyance path 19 is a paper path from the paper container 18 to the paper discharge unit 16, and along the conveyance path 19, the gravity that is downstream in the gravity direction, which is upstream in the conveyance direction of the paper, and the gravity that is downstream in the conveyance direction of the paper. A feed roll 20, a separating roll 22, a resist roll 24, a transfer unit 28, a fixing device 30, and a paper discharge roll 32 that is used as a discharge device are arranged in this order upward. The registration roll 24 once stops the leading edge of the sheet, and then starts transporting the sheet to the downstream side in synchronization with the timing at which the photosensitive unit 26 forms the developer image. The paper discharge roll 32 conveys the paper on which the developer image has been fixed by the fixing device 30 so as to be discharged to the paper discharge unit 16 through the discharge port 13.

  In the image forming apparatus 10 configured as described above, the photoreceptor 40 is uniformly charged by the charging device 42, and a latent image is formed on the uniformly charged photoreceptor 40 by the optical writing device 56. The latent image is visualized by the developing device 44 using a developer. The developer image formed on the photoreceptor 40 is transferred onto the paper in order from the developer located below by the transfer roll 62 of the transfer unit 28. Then, the developer image transferred to the paper is fixed on the paper by the fixing device 30.

  FIG. 2 shows an enlarged cross section of the upper part of the image forming apparatus main body 12. In the image forming apparatus main body 12, a power supply substrate 80, an air guide plate 82 used as an increase unit, and a control substrate 84 are provided. The power supply substrate 80 is made of sheet metal, and is attached, for example, substantially horizontally so as to be fixed to the image forming apparatus main body 12, for example. The above-described power supply unit 34 is mounted on the upward surface of the power supply board 80, and the above-described blower fan 17 is provided at the rear end (left side in FIG. 2) of the power supply board 80. It is mounted via a mounting member 86 used as

  A space S <b> 1 is formed at a position above the power supply substrate 80. The space S1 is surrounded by the upward surface of the power supply substrate 80, the downward surface of the portion used as the paper discharge unit 16 of the image forming apparatus main body 12, and the left and right side plates (not shown) of the image forming apparatus main body 12. It is a space formed. There is a possibility that the heat generated from the power supply unit 34 stays in the space S1.

  The air guide plate 82 is supported by the image forming apparatus main body 12 from below in the direction of gravity, for example, and the power supply board 80 and the power supply board 80 are spaced from the downward surface of the power supply board 80 below the power supply board 80. The image forming apparatus main body 12 is mounted so as to be substantially horizontal. Therefore, the space S <b> 2 is surrounded in the image forming apparatus main body 12 by the left and right side plates (not shown) of the image forming apparatus main body 12, the upward surface of the air guide plate 82, and the downward surface of the power supply substrate 80. It is formed. The rear edge of the wind guide plate 82 is separated from the front edge of the mounting member 86, and a gap between the rear edge of the wind guide plate 82 and the front edge of the mounting member 86. G1 is, for example, 5 mm. Details of the air guide plate 82 will be described later.

  The control board 84 is made of, for example, a printed board, and is provided substantially vertically below the air guide plate 82 in the gravity direction. The control board 84 is mounted in the image forming apparatus main body 12 such that the front surface (the right side in FIG. 2) is attached to the image forming apparatus main body 12, and the control board 84 has a rear surface on the rear surface. A control circuit 88, which is one of the heat generating parts, is attached. The control circuit 88 includes, for example, an MCU (Micro Controller Unit), controls the image forming unit 15 (see FIG. 1) and the paper feeding device 14 (see FIG. 1), and generates heat when performing the control. The control unit 36 described above includes a control board 84 and a control circuit 88.

  A space S3 is formed at a position behind the control board 84 in the image forming apparatus main body 12. The space S2 is a space formed so as to be surrounded by the rear surface of the control board 84, the inner surface of the image forming apparatus main body 12, and the left and right side plates (not shown) of the image forming apparatus main body 12. There is a possibility that the heat generated from the control circuit 88 stays in the space S2. When heat is accumulated in the space S2, the heat may be transmitted to the image forming unit 15 disposed on the front side of the space S2, and when the heat is transmitted to the image forming unit 15, the quality of the formed image. May decrease. In the image forming apparatus 10 according to this embodiment, since the light landing device 56 is disposed on the front side of the space S2 so as to be adjacent to the space S2, the optical writing device 56 is particularly likely to be affected by heat.

  The mounting member 86 has a hollow shape, and an open portion 86a is formed on the rear side, and an open portion 86b and an open portion 86c are formed on the front side. The opening 86a is mounted so that the frame of the blower fan 17 is fitted therein. The opening portion 86b is formed to face the direction of the space S1, and the opening portion 86c is formed to face the direction of the space S2. For this reason, when the blower fan 17 rotates, the air supplied from the outside of the image forming apparatus main body 12 is sent to the space S <b> 1 through the hollow portion and the opening portion 86 b of the mounting member 86 and the hollow portion of the mounting member 86. And it is supplied to the space S2 through the opening part 86c.

  In addition, a lower partition plate 92 and an upper partition plate 94 are provided in the image forming apparatus main body 12. The lower partition plate 92 divides the space inside the image forming apparatus main body 12 into an upper space S4 in which the fixing device 30 is provided and a lower space S5 in which the image forming section 15 is provided. For example, it is also used as a top plate of the photoconductor unit main body 38. The lower partition plate 92 is provided so as to be substantially horizontal in the image forming apparatus main body 12 so that the rear edge portion contacts the front edge portion of the air guide plate 82.

  The upper partition plate 94 divides the space inside the image forming apparatus main body 12 into an upper space S4 in which the fixing device 30 is provided and a lower space S5 in which the image forming section 15 is provided. Is a plate-like member provided so as to be substantially horizontal to the lower partition plate 92 with an interval between the lower partition plate 92 and the upper surface of the lower partition plate 92, for example, a photoconductor unit main body. 38 is provided as a part. For this reason, the image forming apparatus body 12 is surrounded by the left and right side plates (not shown) of the image forming apparatus body 12, the upward surface of the lower partition plate 92, and the lower surface of the upper partition plate 94. A space S6 is formed.

  Further, in the image forming apparatus main body 12, the discharge port 13 passes from the opening 86c of the mounting member 86 through the space S2, the space S6, the front of the fixing device 30 in the space S4, and the upper portion of the fixing device 30 in the space S4. A first flow path 100 that extends to the top is formed. Air supplied by the blower fan 17 and discharged from the image forming apparatus main body 12 through the discharge port 13 flows through the first flow path 100.

  An arrow “a” in FIG. 2 indicates the flow of air in the first flow path 100, and this air flow causes the air in front of the fixing device 30 in the space S 4 and the air above the fixing device 30 in the space S 4. It is discharged out of the image forming apparatus main body 12. For this reason, the heat generated from the fixing device 30 is unlikely to stay in front of the fixing device 30 in the space S4 and above the fixing device 30 in the space S4. Further, the air flowing through the first flow path 100 is used as an air curtain that partitions the upper and lower portions of the air flow when flowing through the spaces S2 and S6, and is a power supply unit disposed above the air flow. The air heated by the fixing device 30 and the fixing device 30 is less likely to move downward than the air flow. Here, the air curtain refers to an air wall that makes it difficult for air to move from one side of the flowing air to the other side by the flow of air.

  Further, in the image forming apparatus main body 12, a second flow path 102 is formed from the opening 86b of the mounting member 86 to the discharge port 13 through the space S1 and the space S2. Similar to the first flow path 100, air supplied by the blower fan 17 and discharged from the image forming apparatus main body 12 through the discharge port 13 flows through the second flow path 102. An arrow b in FIG. 2 indicates the flow of air in the second flow path 102, and the air in front of the fixing device 30 in the space S 4 is discharged outside the image forming apparatus main body 12 by this flow. For this reason, the heat generated from the fixing device 30 is unlikely to stay in a portion of the space S4 in front of the fixing device 30. Further, the length of the second flow path 102 from the mounting member 86 through the image forming apparatus main body 12 to the discharge port 13 is shorter than that of the first flow path 100.

  The air from the first flow path 100 and the air from the second flow path are discharged from the image forming apparatus main body 12 through the same discharge port 13. For this reason, the flow of air discharged from the first flow path 100 and the flow of air discharged from the second flow path 102 are the position where the discharge port 13 is provided, the position upstream of the discharge port 13, And interference at at least one of the positions downstream of the discharge port 13. For this reason, one of the first and second airflows may obstruct the discharge of the other airflow, and the other airflow may not be discharged well from the image forming apparatus main body 12.

In this embodiment, the two airflows interfere with each other by discharging the airflow from the first and second flow paths from the same discharge port 13, but the air discharge from the first flow path 100 and the second Even when air is discharged from the flow path 102 through different discharge ports, the flow rate depends on the positional relationship between the two discharge ports and the direction in which air is discharged from the two discharge ports. Interference may occur between two air streams.

  In the second flow path 102, a rib 104 used as an adjustment unit and used as a first suppression unit, and a rib 106 used as an adjustment unit and used as a second suppression unit are an image forming apparatus main body. 12 is provided so as to protrude to the inner surface. Details of the ribs 104 and 106 will be described later.

  3 and 4 show the air guide plate 82. For example, three ribs 83a, 83b, and 83c are radially formed on the upward surface 82a of the air guide plate 82 so as to protrude upward from the surface 82a so as to spread from the rear to the front. As described above, the gap G1 between the rear edge of the air guide plate 82 and the front edge of the mounting member 86 is, for example, 5 mm. And the clearance gap G2 between the rear-end part of rib 83a, 83b, 83c and the edge part of the front side of the mounting member 86 is wider than G1, for example, is 10 mm. Here, if the gap G2 is too wide, the air flow is likely to leak out, so the gap G2 is desirably 10 mm or less. Further, the width direction gap G3 between the rear end portion of the rib 83a and the mounting member 86 and the width direction gap G4 between the rear end portion of the rib 83c and the mounting member 86 are both 4 mm. If the gaps G3 and G4 are too wide, the air flow is likely to leak out, so the gaps G3 and G4 are desirably 5 mm or less.

  As described above, since gaps are provided between the ribs 83a, 83b, 83c and the rear edge of the air guide plate 82 and the mounting member 86, these gaps are used as communication portions, The first flow path 100 is in communication with the outside of the first flow path 100 through these communication portions. More specifically, the first channel 100 is in communication with the space S3 (see FIG. 2).

  Since the ribs 83a, 83b, and 83c are radially formed so as to spread from the rear to the front, the air supplied to the first flow path 100 by the blower fan 17 is indicated by arrows in FIG. It moves so as to spread from the rear to the front along the wall surfaces of the ribs 83a, 83b, and 83c. At this time, an air flow having a speed determined according to, for example, the amount of air supplied by the blower fan 17 is generated in the first flow path 100. For this reason, when an air flow is generated, a negative pressure is generated in the first channel 100, and the air pressure in the first channel 100 is compared with the outside of the first channel 100 such as the space S3, for example. And lower.

5 and 6, the rib 104 and the rib 106 are shown.
The rib 104 is formed on the inner surface of the portion used as the paper discharge unit 16 of the image forming apparatus main body 12 so as to protrude downward. The rib 104 has a comb-like shape, for example, and a plurality of notches 104a are formed at regular intervals, for example, at a lower edge that is an edge opposite to the edge on the image forming apparatus main body 12 side. ing. The rib 104 suppresses the air supplied into the second flow path 102 by the blower fan 17 from flowing into the downstream side of the rib 104, so that the rib 104 on the downstream side of the rib 104 of the second flow path 102. The flow rate of flowing air is suppressed.

  The rib 106 is provided on the downstream side of the rib 104 in the airflow direction in the second flow path 102, and, like the rib 104, faces the inner surface of the image forming apparatus main body 12 toward the lower side. It is formed to protrude. The rib 106 has, for example, a comb shape, and a plurality of notches 106a are formed at regular intervals, for example, at a lower edge that is an edge opposite to the edge on the image forming apparatus main body 12 side. ing. The rib 106 suppresses the air supplied into the second flow path 102 by the blower fan 17 from flowing into the downstream side of the rib 106, so that the downstream side of the rib 106 of the second flow path 102 is arranged. The flow rate of flowing air is suppressed.

  Instead of the ribs 104 and 106 having a comb-teeth shape, for example, a shape in which an opening is partially formed may be used. Moreover, it is good also as a shape which does not have a notch instead of setting it as a comb-tooth shape or the shape in which the opening was partially formed. In this embodiment, the ribs 104 and 106 and two ribs for suppressing the flow rate of the air flowing through the second flow path are provided. However, even if one rib is used or three or more ribs are used. good.

  In the image forming apparatus 10 configured as described above, when the blower fan 17 rotates and air is supplied to the first flow path 100 and the second flow path 102, the first flow path 100 and the second flow path 100. An air flow is generated in the flow path 102. Then, the air in the first flow path 100 causes the air in front and above the fixing device 30 to be discharged out of the image forming apparatus main body 12 and heated by the fixing device 30 in front and above the fixing device 30. The trapped air is less likely to stay. Further, due to the air flow in the second flow path 102, the air is discharged out of the image forming apparatus main body 12 behind the fixing device 30, and the air heated by the fixing device 30 stays behind the fixing device 30. It becomes difficult to do.

  Further, in the image forming apparatus 10, the air flowing in the first flow path 100 is used as an air curtain, and the air heated by the fixing device 30 and the air heated by the power supply unit 34 are the first flow. It becomes difficult to move to the space S5 on the side where the image forming section 15 below the path 100 is provided.

  Further, in the image forming apparatus 10, an air flow is generated in the first flow path 100, and the air pressure in the first flow path 100 is lower than the air pressure in the space S3. The air in the space S3 flows into the first flow path 100 through the gaps between the wind plate 82 and the ribs 83a, 83b, 83c. For this reason, the air heated by the control circuit 88 is unlikely to stay in the space S3. Further, as in the case where air is blown into the space S3 using the blower fan 17 to prevent air from staying in the space S3, for example, the wind reaches a member constituting the image forming unit 15 such as the optical writing device 56. Further, there is no possibility that the quality of the image formed by the image forming unit 15 is deteriorated.

  Further, in the image forming apparatus 10, by providing the air guide plate 82, the space S <b> 2 is narrowed, thereby increasing the flow rate of the air flowing in the first channel 100 per unit time and the second channel. The rib 104 and the rib 106 are provided in the inside, and the flow rate of the air flowing through the second flow path per unit time is suppressed. For this reason, the amount of air per unit time discharged from the second flow path 102 via the discharge port 13 is equal to the amount of air discharged per unit time from the first flow path 100 via the discharge port 13. Less than the amount. For this reason, the flow of air discharged from the first and second flow paths interferes with each other near the discharge port 13, but the flow of air discharged from the second flow path is from the first flow path. Air is unlikely to become an obstacle to the discharge of air, and the discharge of air from the first flow path is favorably performed.

  In the image forming apparatus 10, ribs 104 and 106 are provided in the second flow path 102, and the amount of air flowing in the second flow path 102 per unit time is suppressed by the ribs 104 and 106. However, the rib 104 and the rib 106 are provided on the downstream side of the power supply unit 34 and the control circuit 88 in the air flow direction. For this reason, the air flow before the flow rate is suppressed is used as an air curtain that suppresses the movement of the air heated by the power supply unit 34, and is used to discharge the air in the space S3 heated by the control circuit 88. Used.

  FIG. 7 shows a second embodiment of the air guide plate 82 used in the image forming apparatus 10 according to the actual embodiment of the present invention. In the first embodiment described above, the gap G <b> 1 in the front-rear direction is formed between the rear edge of the air guide plate 82 and the mounting member 86. On the other hand, in the second embodiment, the rear edge of the air guide plate 82 is located behind the front edge of the mounting member 86 in the image forming apparatus 10 (left side in FIG. 7). The wind guide plate 82 and the mounting member 86 are arranged so as to overlap in the front-rear direction. In the second embodiment described above, the gap G <b> 2 is formed between the rear ends of the ribs 83 a and 83 c and the front edge of the mounting member 86. On the other hand, in the second embodiment, the rear end portions of the ribs 83 a and 83 c are arranged so as to be closer to the rear side in the image forming apparatus 10 than the front edge portion of the mounting member 86.

  As described above, by arranging the air guide plate 82, the rib 83a, and the rib 83c, the air supplied from the blower fan 17 is less likely to leak compared to the first embodiment. The arrows in FIG. 7 indicate the flow of air flowing into the first flow path 100 from the space S3 (see FIG. 2). As shown in FIG. 7, the air from the space S3 flows into the first flow path 100 so as to go around the rear ends of the ribs 83a and 83b.

  As described above, the present invention can be applied to image forming apparatuses such as copying machines, facsimile apparatuses, and printers, and electronic apparatuses.

1 is a side view illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention. 1 is an enlarged cross-sectional view of an upper part of an image forming apparatus main body used in an embodiment of the present invention. It is a perspective view which shows the baffle plate used for embodiment of this invention. It is a top view which shows the baffle plate used for embodiment of this invention. FIG. 4 is a cross-sectional view showing a first suppression unit used in the embodiment of the present invention, showing a cross section taken along line AA in FIG. 3. FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3 and showing the first and second suppressing portions used in the embodiment of the present invention. It is a top view which shows 2nd Embodiment of the baffle plate used for embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Image forming apparatus main body 13 Outlet 15 Image forming part 17 Blower fan 30 Fixing apparatus 32 Paper discharge roll 34 Power supply unit 36 Control unit 70 Heating roll 80 Power supply board 82 Air guide plate 86 Mounting member 86a Opening part 86b Opening Part 86c opening part 88 control circuit 92 lower partition plate 94 upper partition plate 100 first flow path 102 second flow path 104 rib 106 rib

Claims (8)

An image forming apparatus main body;
An image forming unit provided in the main body of the image forming apparatus for performing image formation;
A first flow path through which air discharged from the image forming apparatus main body flows;
A second flow path through which the air discharged from the image forming apparatus main body flows so as to interfere with the flow of air discharged from the first flow path;
The first flow path is set so that the amount of air discharged per unit time from the second flow path is smaller than the amount of air discharged per unit time from the first flow path. and adjusting means for adjusting the amount of air flowing through the quantity and the second flow path of the air flowing,
I have a,
The adjusting means includes
A conductive plate having a plurality of ribs, wherein a space between the plurality of ribs forms a part of the first flow path, and the space extends downstream in the direction in which the airflow flows; And is communicated with the outside through the communication portion, and negative pressure is generated in the space by the air flow flowing in the space, and from the outside of the space into the space through the communication portion. An increasing part for increasing the flow rate of air flowing per unit time of the first flow path by flowing an air flow;
A suppressor that suppresses the flow of air from the upstream side to the downstream side, thereby suppressing the flow rate of air flowing through the second flow path per unit time; and
An image forming apparatus. A heat generating part that generates heat in the image forming apparatus main body;
The reduction unit, an image forming apparatus of suppressing claim 1, wherein the flow rate of air flowing through the downstream side of the heat generating portion of said second flow path. The air supply to the first flow path and the second flow path, further comprising a generator for generating a flow of air in the first flow path and the second flow path,
It said second flow path, the flow path length of the first flow image forming apparatus of a short claim 1 or 2, wherein than road. Wherein the image forming apparatus main body, the discharge port for discharging the air from at least one of the first flow path and said second flow path have been formed,
A discharge device for discharging the recording medium on which the image has been formed by the image forming unit to the outside of the image forming apparatus main body;
The discharge device, an image forming apparatus according to any one of claims 1 to 3 for discharging the recording medium through the outlet. It said first flow path and at least one of the second flow path, the image forming apparatus according to any one of claims 1 to 4 is used as an air curtain. An image forming apparatus main body;
An image forming unit provided in the main body of the image forming apparatus for performing image formation;
A first flow path and a second flow path provided in the image forming apparatus main body and through which air discharged through the same discharge portion formed in the image forming apparatus main body flows ;
The first flow path is set so that the amount of air discharged per unit time from the second flow path is smaller than the amount of air discharged per unit time from the first flow path. Adjusting means for adjusting the flow rate of flowing air and the amount of air flowing through the second flow path;
Have
The adjusting means includes
A conductive plate having a plurality of ribs, wherein a space between the plurality of ribs forms a part of the first flow path, and the space extends downstream in the direction in which the airflow flows; And is communicated with the outside through the communication portion, and negative pressure is generated in the space by the air flow flowing in the space, and from the outside of the space into the space through the communication portion. An increasing part for increasing the flow rate of air flowing per unit time of the first flow path by flowing an air flow;
A suppressor that suppresses the flow of air from the upstream side to the downstream side, thereby suppressing the flow rate of air flowing through the second flow path per unit time; and
An image forming apparatus. The device body;
A first flow path through which air discharged from within the apparatus body flows;
A second flow path through which the exhausted air flows so as to interfere with the flow of air exhausted from the first flow path from within the apparatus body;
The first flow path is set so that the amount of air discharged per unit time from the second flow path is smaller than the amount of air discharged per unit time from the first flow path. and adjusting means for adjusting the amount of air flowing through the quantity and the second flow path of the air flowing,
I have a,
The adjusting means includes
A conductive plate having a plurality of ribs, wherein a space between the plurality of ribs forms a part of the first flow path, and the space extends downstream in the direction in which the airflow flows; And is communicated with the outside through the communication portion, and negative pressure is generated in the space by the air flow flowing in the space, and from the outside of the space into the space through the communication portion. An increasing part for increasing the flow rate of air flowing per unit time of the first flow path by flowing an air flow;
A suppressor that suppresses the flow of air from the upstream side to the downstream side, thereby suppressing the flow rate of air flowing through the second flow path per unit time; and
An electronic device. The device body;
A first flow path and a second flow path that are provided in the apparatus main body and through which air discharged through the same discharge portion formed in the apparatus main body flows;
The first flow path is set so that the amount of air discharged per unit time from the second flow path is smaller than the amount of air discharged per unit time from the first flow path. and adjusting means for adjusting the amount of air flowing through the quantity and the second flow path of the air flowing,
I have a,
The adjusting means includes
A conductive plate having a plurality of ribs, wherein a space between the plurality of ribs forms a part of the first flow path, and the space extends downstream in the direction in which the airflow flows; And is communicated with the outside through the communication portion, and negative pressure is generated in the space by the air flow flowing in the space, and from the outside of the space into the space through the communication portion. An increasing part for increasing the flow rate of air flowing per unit time of the first flow path by flowing an air flow;
A suppressor that suppresses the flow of air from the upstream side to the downstream side, thereby suppressing the flow rate of air flowing through the second flow path per unit time; and
An electronic device.

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