JP5796689B2 - Image forming apparatus - Google Patents

Description

The present invention relates to an image forming apparatus.

  In Patent Document 1, cooling is performed by blowing air to a heat transfer material provided on a guide plate on the paper discharge side of the fixing device by a fan.

  In Patent Document 2, there is a cooling duct that is installed with the direction intersecting the sheet conveyance direction as a longitudinal direction between the fixing device and the heat pipe to cool the sheet, and the fan is blown into the cooling duct.

  In Patent Document 3, a duct and a heat pipe are provided in a direction crossing the paper conveyance direction, and cool air outside the apparatus is taken into the duct, and the heat pipe is cooled to discharge the warm air to the outside. doing.

  In Patent Document 4, a louver for introducing air into the apparatus main body is provided inside the handle portion of the sheet feeding cassette.

JP-A-11-202738 JP 2003-223092 A JP-A-11-015308 JP 2008-077077 A

An object of the present invention is to obtain an image forming apparatus capable of cooling a recording medium by sucking air without affecting the appearance of the apparatus.

An image forming apparatus according to a first aspect of the present invention includes a photosensitive member, a developing device that develops a latent image formed on the photosensitive member with a developer, and a developer image of the photosensitive member that is developed by the developing device. a transfer unit for transferring the recording medium, and a first housing but provided inside said first housing and parallel beauty, inside, developing a photosensitive member, a latent image formed on the photoconductor A second housing without a developing device that develops with a developer, and a transfer unit that transfers the developer image of the photoreceptor developed with the developing device to a recording medium, and a recording medium provided in the second housing A transport unit that transports air, a door provided on the front surface of the second housing, an air inlet provided at a lower portion of the door, and for taking in air outside the second housing, and provided on the door. The air that extends upward from the lower portion of the door and flows in from the lower side of the vertical direction flows upward. A duct, a supply port formed above the intake port of the first duct, and provided in the transport unit, extending rearward from the front surface of the second housing, and air from the supply port And a recording medium transport device having a second duct that flows and an exhaust fan that exhausts the air in the second duct to the outside of the second duct . In the image forming apparatus according to a second aspect of the present invention, on the front surface of the first housing, another door is provided that is maintained in a closed state when the door is opened. The first duct of the image forming apparatus according to claim 3 of the present invention extends to the upper side of the upper end of the supply port. According to a fourth aspect of the present invention, there is provided an image forming apparatus comprising: a photosensitive member; a developing device that develops a latent image formed on the photosensitive member with a developer; and a developer image of the photosensitive member that is developed with the developing device. And a transfer portion for transferring the image to the recording medium, and a first door is provided on the front surface. Air taken in from a lower portion of the first door is vertically lowered in the first door. A first casing in which a duct flowing upward from the first casing is not formed, a second casing aligned with the first casing, a transport unit that is provided in the second casing and transports a recording medium, and the second A second door provided on the front surface of the housing; a suction port provided at a lower portion of the second door for taking in air outside the second housing; and provided on the second door; The air that extends upward from the lower part of the second door flows from the lower side to the upper side in the vertical direction. A first duct, a supply port formed above the intake port of the first duct, and provided in the transport unit, extending rearward from the front surface of the second housing, and extending from the supply port. A recording medium transporting device having a second duct through which the air flows and an exhaust fan for exhausting the air in the second duct to the outside of the second duct. The first door of the image forming apparatus according to claim 5 of the present invention is maintained in a closed state when the second door is opened. The first duct of the image forming apparatus according to a sixth aspect of the present invention extends to the upper side of the upper end of the supply port.

  In the cooling device according to the first aspect, an intake port that performs intake is disposed on the front side of the apparatus main body, and an exhaust port that performs exhaust is disposed on the rear surface side of the apparatus main body. A cooling means for dissipating heat from the air to cool the object to be cooled and discharging the dissipated air from the exhaust port, and a horizontal position of the opening located on the front side of the apparatus main body and positioning the air intake port inside A first covering member that covers a part of the direction and a part of the intake port in the horizontal direction, another part of the opening adjacent to the first covering member in the horizontal direction, and the intake port A second covering member that covers the other part; and at least one of the first covering member and the second covering member, provided on the side facing the air inlet, and the air intake from an opening formed toward the floor And a flow path member for flowing air toward the mouth

  The cooling device according to a second aspect is a cooling device that cools the recording medium as the cooling target conveyed from the first covering member side to the second covering member side, and at least the first covering member includes the above-described cooling medium. A flow path member is provided.

  In the cooling device according to the third aspect, the second covering member is disposed away from the intake port toward the front side.

  In the cooling device according to the fourth aspect, the mating surfaces of the first covering member and the second covering member are arranged with a gap therebetween.

  In the cooling device according to the fifth aspect, a hole for intake is formed on a side surface of the flow path member positioned on the mating surface side of the first covering member and the second covering member.

  In the cooling device according to the sixth aspect, the vertical position of the hole is formed in accordance with the vertical position of the intake port.

  In the cooling device according to the seventh aspect, around the air intake port, when the air intake port is covered with the first cover member and the second cover member, the air flow port member comes into contact with the air intake port. A sealing member for sealing the flow path member is provided.

  The cooling device according to the eighth aspect is provided with a facing member that extends outward from the sealing member around the air inlet and faces the first covering member and the second covering member.

  In the cooling device according to a ninth aspect, the cooling unit includes an exhaust passage through which air flows from the intake port to the exhaust port, and an exhaust unit that exhausts air from the exhaust passage. The area of the cross section of the exhaust flow path on the downstream side in the exhaust direction is larger than that on the upstream side in the exhaust direction.

  The cooling device according to the tenth aspect is provided with a protection member that covers and protects the rear surface of the device main body and is formed with a plurality of exhaust holes so as to face the exhaust port, and more than the opening area of the exhaust port. The area of the protective member in which the plurality of exhaust holes are formed is large.

  In the cooling device according to the eleventh aspect, the exhaust port and the protection member are spaced apart.

  An image forming apparatus according to a twelfth aspect is disposed upstream of the cooling apparatus according to any one of the first aspect to the eleventh aspect, and the conveyance direction of the recording medium as the cooling target, relative to the cooling apparatus. A fixing unit that fixes the developer on the recording medium to the recording medium; an image forming unit that is disposed upstream of the fixing unit in the conveyance direction of the recording medium and forms an image on the recording medium with the developer; Have

According to the first to sixth aspects of the present invention, the recording medium can be cooled by sucking air without affecting the appearance of the apparatus.

  According to the configuration of the first aspect, the object to be cooled can be cooled by inhaling air without affecting the appearance of the apparatus.

  According to the structure of the 2nd aspect, cooling efficiency goes up compared with what does not provide a flow-path member at least in the 1st coating | coated member.

  According to the structure of the 3rd aspect, the flow volume of the air to an inlet port can be increased compared with what does not leave | separate a 2nd coating | coated member from the said inlet port to the front side.

  According to the structure of the 4th aspect, the flow volume of the air to an inlet port can be increased compared with the thing where the mating surface of a 1st coating member and a 2nd coating member is not arrange | positioned with the clearance gap.

  According to the structure of the 5th aspect, compared with the thing in which the hole part for intake is not formed in the side surface of the flow-path member located in the mating surface side of a 1st coating member and a 2nd coating member, to an inlet port The air flow rate can be increased.

  According to the configuration of the sixth aspect, the intake amount of the high-temperature air in the apparatus main body is reduced as compared with the case where the vertical position of the hole is not formed in accordance with the vertical position of the intake port. be able to.

  According to the configuration of the seventh aspect, it is possible to reduce the intake amount of the high-temperature air in the apparatus main body as compared with the case where the sealing member for sealing the intake port and the flow path member is not provided around the intake port. it can.

  According to the configuration of the eighth aspect, the temperature inside the apparatus main body is higher than that in which the opposed member that extends outside the sealing member around the air inlet and faces the first covering member and the second covering member is not provided. The amount of intake air can be reduced.

  According to the configuration of the ninth aspect, the exhaust gas flow rate can be increased as compared to the exhaust passage having a cross-sectional area that is not larger on the downstream side than on the upstream side in the exhaust direction.

  According to the configuration of the tenth aspect, the exhaust gas flow rate can be increased as compared with the area in which the area of the protective member in which the plurality of exhaust holes are formed is smaller than the opening area of the exhaust port.

  According to the configuration of the eleventh aspect, it is possible to increase the exhaust gas flow rate as compared with the case where the exhaust port and the protection member are not spaced apart.

  According to the configuration of the twelfth aspect, the object to be cooled can be cooled by inhaling air without affecting the appearance of the apparatus.

1 is an external view of an image forming apparatus according to an embodiment of the present invention. 1 is an overall configuration diagram of an image forming apparatus according to an embodiment of the present invention. 1 is a configuration diagram of an image forming unit according to an embodiment of the present invention. FIG. It is the perspective view which showed the heat sink of the cooling unit which concerns on embodiment of this invention. It is a front view of the 2nd processing part concerning the embodiment of the present invention. (A) It is sectional drawing which shows the structure of the cooling device which concerns on embodiment of this invention. (B) It is a schematic diagram which shows the cross-sectional area of the exhaust duct which concerns on embodiment of this invention. It is a perspective view which shows the attachment state of the door duct which concerns on embodiment of this invention. It is explanatory drawing which shows the door duct and cooling unit which concern on embodiment of this invention. It is explanatory drawing which shows the structure around the cooling unit which concerns on embodiment of this invention, and the inflow state of air. It is an enlarged view of the door duct in the boundary part of the door which concerns on embodiment of this invention. FIG. 5 is a configuration diagram of a second processing unit of the image forming apparatus according to the embodiment of the present invention as viewed from the rear side. It is explanatory drawing which showed the state through which air flows in the door duct and cooling unit which concern on embodiment of this invention.

  An example of a recording medium conveyance device according to an embodiment of the present invention will be described.

  FIG. 1 shows an external appearance of the image forming apparatus 10 according to the present embodiment as viewed from the front right side obliquely upward. The image forming apparatus 10 forms a color image or a black and white image, and is detachable from the first processing unit 10A and the first processing unit 10A disposed on the left side with respect to the boundary H in front view. And a second processing unit 10B arranged on the right side. The first processing unit 10A and the second processing unit 10B have a housing 11 (see FIG. 8) as an example of an apparatus main body made of a plurality of frame materials.

  The first processing unit 10A includes a first door 21A, 21B that is supported by a hinge member (not shown) and has a left door and a right end that can be opened and closed in a door-opening manner, and an arrow -Y below the first door 21A, 21B. Second doors 23A and 23B that can be pulled out in the direction are provided. The arrow + R direction is the clockwise direction in plan view, the arrow -R direction is the counterclockwise direction in plan view, the first door 21A is in the arrow + R direction (left side), and the first door 21B is in the arrow -R direction. Each is opened independently in the direction (right side).

  On the other hand, the second processing unit 10B has a left door and a right edge supported by hinge members (not shown), respectively, and a third door 25 that can be opened and closed in a door-to-door manner with the boundary J as a reference (alignment position), and a third door A fourth door 27 that can be opened in an arrow + R direction on the upper side of 25 is provided. Here, the third door 25 covers a part in the horizontal direction of the opening 11A (see FIG. 8) on the front surface of the housing 11 and a part in the horizontal direction of an inlet 123 to be described later. The left door 25A as an example of a first covering member opened in the direction (left side), and the other part of the opening 11A and the other part of the air inlet 123 adjacent to the left door 25A in the horizontal direction are covered. And a right door 25B as an example of a second covering member opened in the arrow-R direction (right side), and the left door 25A and the right door 25B are opened independently. Yes. Note that the boundary J is disposed at a position where the air inlet 123 is divided into left and right when viewed from the front of the image forming apparatus.

  As shown in FIG. 5, the third door 25 has an arrow between the right side surface 31 of the left door 25A and the left side surface 33 of the right door 25B at the boundary J when the left door 25A and the right door 25B are closed. It is arranged with a gap d1 in the X direction. Here, the gap in the present embodiment means a gap having a size that allows air to flow. In addition, in FIG. 5, illustration of the discharge part 196 mentioned later is abbreviate | omitted.

  FIG. 2 shows an overall configuration inside the image forming apparatus 10. A control unit 13 that includes an image signal processing unit that performs image processing on image data sent from a computer, and that controls the drive of each unit of the image forming apparatus 10, inside the second processing unit 10 </ b> B and above the vertical direction. Is provided. A power supply unit 230 is provided below the control unit 13. The power supply unit 230 supplies power to each part of the image forming apparatus 10 by changing an alternating current taken from outside into a direct current.

  On the other hand, the first special color (V), the second special color (W), the yellow (Y), the magenta (M), the cyan (C), and the black are inside the first processing unit 10A and vertically upward. Toner cartridges 14V, 14W, 14Y, 14M, 14C, and 14K that store the respective toners (K) are provided so as to be replaceable in the horizontal direction. The first special color and the second special color are selected from special colors (including transparency) other than yellow, magenta, cyan, and black. Further, in the following description, when distinguishing V, W, Y, M, C, and K, an explanation is given by adding an alphabetic character of V, W, Y, M, C, or K after the number. When V, W, Y, M, C, and K are not distinguished, V, W, Y, M, C, and K are omitted.

  Under the toner cartridge 14, six image forming units 16 as an example of image forming units corresponding to the toners of the respective colors are provided side by side in a horizontal direction corresponding to the toner cartridges 14. On the lower side, an exposure unit 40 as an example of an image forming unit is provided for each image forming unit 16. The exposure unit 40 receives the image data subjected to image processing from the control unit 13 described above, modulates a semiconductor laser (not shown) according to the color material gradation data, and emits the exposure light L from these semiconductor lasers. It is comprised so that it may radiate | emit. Specifically, an electrostatic latent image is formed on the photoconductor 18 by irradiating the surface of the photoconductor 18 (see FIG. 3) described later with exposure light L corresponding to each color.

  As shown in FIG. 3, the image forming unit 16 includes a photoreceptor 18 that is driven to rotate in the direction of arrow A (clockwise in FIG. 3). A corona discharge method (non-contact charging method) scorotron charger 20 that charges the photosensitive member 18 and an exposure light L emitted by the exposure unit 40 are formed on the photosensitive member 18 around the photosensitive member 18. A developing device 22 that develops the electrostatic latent image with each color developer (toner), a cleaning blade 24 that cleans the surface of the photoreceptor 18 after the transfer, and a light that irradiates the surface of the photoreceptor 18 after the transfer. An erase lamp 26 is provided for performing static elimination. The scorotron charger 20, the developing device 22, the cleaning blade 24, and the erase lamp 26 are arranged in this order from the upstream side to the downstream side in the rotation direction of the photoconductor 18 so as to face the surface of the photoconductor 18. Yes.

  Further, the developing device 22 is disposed on the side of the image forming unit 16 (right side in the drawing in this embodiment), and a developer containing member 22A filled with a developer G containing toner and a developer containing member 22A. And a developing roll 22 </ b> B that moves the filled toner to the surface of the photoreceptor 18. The developer accommodating member 22A is connected to the toner cartridge 14 (see FIG. 2) through a toner supply path (not shown), and the toner is supplied from the toner cartridge 14.

  As shown in FIG. 2, a transfer unit 32 is provided below each image forming unit 16. The transfer unit 32 is disposed inside the intermediate transfer belt 34 and the endless intermediate transfer belt 34 that is in contact with each photoconductor 18, and the toner image formed on each photoconductor 18 is transferred to the intermediate transfer belt 34 in multiple transfers. And six primary transfer members 36 as primary transfer members. The intermediate transfer belt 34 includes a drive roll 38 driven by a motor (not shown), a tension applying roll 41 that adjusts the tension of the intermediate transfer belt 34, a support roll 42 that is disposed opposite to a secondary transfer roll 62 described later, It is wound around a plurality of support rolls 44 and is circulated and moved in the direction of arrow B (counterclockwise direction) in FIG.

  Specifically, each primary transfer roll 36 is disposed opposite to the photoreceptor 18 of each image forming unit 16 with the intermediate transfer belt 34 interposed therebetween. The primary transfer roll 36 is applied with a transfer bias voltage having a polarity opposite to the toner polarity by a power supply unit (not shown). With this configuration, the toner image formed on the photoreceptor 18 is transferred to the intermediate transfer belt 34. A cleaning blade 46 whose tip is in contact with the intermediate transfer belt 34 is provided on the opposite side of the drive roll 38 and the intermediate transfer belt 34. The cleaning blade 46 is disposed on the intermediate transfer belt 34 that circulates and moves. Residual toner and paper dust are removed.

  On the other hand, below the transfer unit 32, below the first processing unit 10A, two large paper feed cassettes 48 in which a sheet member P as an example of a cooling target and a recording medium is accommodated are provided in the horizontal direction. The sheet member P can be stored in large quantities. Since the two paper feed cassettes 48 have the same configuration, only one paper feed cassette 48 will be described, and description of the other paper feed cassette 48 will be omitted.

  The paper feed cassette 48 can be pulled out by pulling out the second doors 23A and 23B (see FIG. 1) from the first processing unit 10A to the near side, and when the paper feed cassette 48 is pulled out from the first processing unit 10A. The bottom plate 50 provided in the paper feed cassette 48 and on which the sheet member P is placed is lowered by an instruction from a control means (not shown). The user can replenish the sheet member P by lowering the bottom plate 50. Further, when the paper feed cassette 48 is attached to the first processing unit 10A, the bottom plate 50 is raised by an instruction from the control means. Above the one end side of the paper feed cassette 48, a feed roll 52 for sending the sheet member P from the paper feed cassette 48 to the transport path 60 is provided, and the uppermost sheet member P placed on the rising bottom plate 50 is provided. And the delivery roll 52 come into contact with each other. Further, a separation roll 56 that prevents double feeding of the sheet member P is provided on the downstream side (hereinafter simply referred to as “downstream side”) of the feeding roll 52 in the sheet member conveyance direction. A plurality of transport rolls 54 for transporting the member P downstream in the transport direction are provided.

  The conveyance path 60 provided on the upper side of the paper feed cassette 48 folds the sheet member P delivered from the paper feed cassette 48 to the opposite side (the left side in the drawing) at the first folding part 60A, and further at the second folding part 60B. It is folded back to the opposite side (the right side in the figure) and extends toward the transfer position T sandwiched between the secondary transfer roll 62 and the support roll 42.

  An aligner (not shown) for correcting the inclination of the conveyed sheet member P is provided at a portion sandwiched between the second folding portion 60B and the transfer position T, and is sandwiched between the aligner and the transfer position T. In the part, an alignment roll 64 for adjusting the movement timing of the toner image on the intermediate transfer belt 34 and the conveyance timing of the sheet member P is provided.

  The secondary transfer roll 62 is applied with a transfer bias voltage having a polarity opposite to the toner polarity by a power supply unit (not shown). With this configuration, the color toner images transferred onto the intermediate transfer belt 34 are secondarily transferred onto the sheet member P conveyed along the conveyance path 60 by the secondary transfer roll 62. Further, a preliminary path 66 extending from the side surface of the first processing unit 10A is provided so as to join the second folding unit 60B of the transport path 60, and an external path disposed adjacent to the first processing unit 10A is provided. A sheet member P sent from a large-capacity stacking unit (not shown) can enter the conveyance path 60 through the preliminary path 66.

  On the other hand, on the downstream side of the transfer position T, there are provided a plurality of conveying devices 70 that convey the sheet member P to which the toner image has been transferred toward the second processing unit 10B. The conveying device 70 includes a plurality of belt members wound around a drive roll and a driven roll (not shown), and rotates the belt member by rotating the drive roll to direct the sheet member P toward the downstream side. It is designed to be transported.

  The downstream side of the conveying device 70 extends from the first processing unit 10A to the second processing unit 10B, and the sheet member P sent out by the conveying device 70 is received by the conveying device 80 provided in the second processing unit 10B. And is further conveyed downstream. A fixing unit 82 as an example of a fixing unit that fixes the toner image transferred onto the surface of the sheet member P to the sheet member P with heat and pressure is provided on the downstream side of the conveying device 80. A duct 83 for exhaust is provided around the fixing unit 82 so as to surround the fixing unit 82.

  The fixing unit 82 includes a heating unit including a fixing belt and a plurality of heating rolls, and a pressurizing unit including a pressure roll disposed in pressure contact with the fixing belt. In the fixing unit 82, the sheet member P is pressurized and heated to fix the toner image.

  As shown in FIG. 2, a conveying device 108 that conveys the sheet member P sent from the fixing unit 82 to the downstream side is provided on the downstream side of the fixing unit 82, and the fixing unit is disposed on the downstream side of the conveying device 108. A conveyance unit 112 that conveys the sheet member P heated by 82 to the downstream side is provided. A decurling unit 140 that corrects the warp of the sheet member P is provided on the downstream side of the transport unit 112.

  The transport unit 112 is provided with an endless heat receiving belt 116 that contacts the sheet member P and absorbs the heat of the sheet member P on the upper side of the transport path 60, and on the lower side of the transport path 60. An endless pressing belt 130 that contacts the sheet member P and presses the sheet member P against the heat receiving belt 116 is provided. The heat receiving belt 116 is provided with a plurality of support rolls 118 and a driving roll 120 that transmits a driving force to the heat receiving belt 116, and is supported so as to be able to circulate in the conveying direction of the sheet member P. Yes. Further, the pressing belt 130 is provided with a plurality of support rolls 132 urged toward the heat receiving belt 116 by a biasing means (not shown) such as a spring, and is circulated by the plurality of support rolls 132. Supported as possible.

  On the other hand, a discharge roll 198 is provided downstream of the decurling unit 140 to discharge the sheet member P having an image formed on one side thereof to a discharge unit 196 attached to the side surface of the second processing unit 10B. Here, when images are formed on both surfaces of the sheet member P, the sheet member P is conveyed to the reversing unit 200 provided downstream of the decurling unit 140.

  The reversing unit 200 is provided with a reversing path 202. The reversing path 202 includes a branch path 202A that branches from the transport path 60, a sheet transport path 202B that transports the sheet member P transported along the branch path 202A toward the first processing unit 10A, and a sheet transport path. A reversing path 202C is provided, in which the sheet member P conveyed along 202B is folded back in the reverse direction to be conveyed in a switchback manner and the front and back are reversed. With this configuration, the sheet member P that has been switched back in the reverse path 202C is transported toward the first processing unit 10A, and further enters the transport path 60 provided above the paper feed cassette 48, whereby the transfer position T Will be sent again.

  Next, the cooling device 100 will be described.

  As shown in FIG. 6A, the cooling device 100 forms an image with a cooling unit 110 as an example of a cooling unit provided at a site of the transport unit 112 in the transport path of the sheet member P and a site of the transport unit 112. Third door 25 (left door 25A, right door 25B) constituting the front surface of apparatus 10 and a door side as an example of a flow path member that is attached to the back side of third door 25 and flows air to cooling unit 110 The duct 131 is comprised.

  The cooling unit 110 is provided inside the heat receiving belt 116 in the transport unit 112, and is an exhaust duct as an example of an exhaust channel for flowing air from the front side to the rear side of the image forming apparatus 10 (see FIG. 2). 121, a heat sink 122 that is provided in the exhaust direction of the exhaust duct 121 and absorbs and dissipates heat, and an exhaust unit that exhausts air radiated by the heat sink 122 to the outside of the housing 11 (see FIG. 8). And an exhaust fan 128.

  The exhaust duct 121 is a cylindrical body that extends from an intake port 123 provided on the front side of the image forming apparatus 10 to an exhaust port 125 provided on the rear side of the image forming apparatus 10, and has an exhaust direction (arrow + Y direction). The cross section in the intersecting direction is rectangular. The exhaust duct 121 is disposed on the front side of the image forming apparatus 10 and has a constant cross section in the exhaust direction. The exhaust duct 121 is disposed on the rear surface side of the image forming apparatus 10 and has a tapered cross section in the exhaust direction. The duct 121B is connected. The image forming apparatus 10 includes a front panel 113 as an example of a facing member that is a plate member disposed to face the third door 25 on the front side of the inside, and a protective member that covers and protects the rear surface of the image forming apparatus 10. As an example, it includes a rear cover 117 and a rear panel 115 that is a plate member disposed opposite to the rear cover 117 on the upstream side of the rear cover 117 in the exhaust direction.

  The first duct 121A is provided from the front panel 113 to the rear panel 115, and a heat sink 122 is attached inside. The second duct 121B is provided from the rear panel 115 to the front side of the rear cover 117, and an exhaust fan 128 is attached to a portion where the rear panel 115 is provided. Note that a gap d2 is formed from the exhaust port 125 of the exhaust duct 121 to the rear cover 117, and a plurality of exhaust holes for exhaustion as an example of the exhaust holes are formed in a portion of the rear cover 117 facing the exhaust port 125. 119 is formed.

  As shown in FIGS. 6A and 6B, the position on the exhaust fan 128 side in the exhaust direction in the second duct 121B is E1, the position on the exhaust port 125 side is E2, and the arrow X direction at the position E1 (see FIG. 6). 2) is X1, the height in the arrow Z direction is Z1, the width in the arrow X direction at the position E2 is X2, and the height in the arrow Z direction is Z2. Here, as described above, the tapered second duct 121B is enlarged toward the exhaust port 125 so that X1 = X2 and Z2> Z1, and the cross-sectional area S1 at the position E1 (= X1 × Z1). ) Is larger in cross-sectional area S2 (= X2 × Z2) at the position E2.

  On the other hand, as shown in FIG. 4, the heat sink 122 has a U-shaped cross section with an open top, a contact member 124 for contacting the heat receiving belt 116 to the sheet member P and the contact member 124 contacting the heat receiving belt 116 to the bottom surface, and a contact member A plurality of heat radiating plates 126 are provided so as to be erected from the concave portion 124 and to which heat is transmitted from the contact member 124. As an example, the contact member 124 and the heat sink 126 are made of aluminum.

  As shown in FIGS. 6A, 7, and 8, a door-side duct 131 for flowing air from the floor 37 to the air inlet 123 is provided on the back surface side of the left door 25 </ b> A. The door-side duct 131 is a hollow structure extending from the height facing the air inlet 123 to the lower end on the right side 31 side of the left door 25A, and the bottom wall has an introduction port as an example of an opening toward the floor 37. 131A is formed. In addition, the door-side duct 131 is provided with a supply port 131B having a shape and size that comes into contact with the intake port 123 and is integrated with the intake port 123 at a position facing the intake port 123.

  On the other hand, as shown in FIGS. 7 and 8, air flows from the inside of the main body of the image forming apparatus 10 (see FIG. 2) to the air inlet 123 (see FIG. 6A) on the back side of the right door 25B. An auxiliary duct 133 is provided. The auxiliary duct 133 is a hollow structure that covers a portion facing the air inlet 123 on the left side 33 side of the right door 25B, and a plurality of supply ports 133A arranged in the vertical direction are formed at positions facing the air inlet 123, An opening (not shown) for intake air from the image forming apparatus 10 is formed on the side wall. The portion excluding the auxiliary duct 133 on the back side of the right door 25B is spaced from the air inlet 123 to the front side (arrow -Y direction), and the front panel 113 (see FIG. 6A) and the right door. A space portion 137 is formed between 25B and 25B.

  As shown in FIG. 9, the front panel 113 extends outward from the air inlet 123, and the peripheral edge of the air inlet 123 on the front panel 113 is an example of a sealing member that surrounds the air inlet 123 in a rectangular shape. A seal member 129 is fixed. As an example, the seal member 129 is formed of a rectangular parallelepiped sponge. Here, when the left door 25A and the right door 25B are closed, as shown in FIG. 6A, the door side duct 131 comes into contact with the seal member 129 and compresses the seal member 129. The exhaust duct 121 is sealed with a seal member 129. Further, when the left door 25A and the right door 25B are closed, as shown in FIG. 9, a gap is formed at a portion where the right side surface 31 and the left side surface 33 face each other. 121 becomes a negative pressure, and air flows from the gap toward the air inlet 123. The sealing in the present embodiment includes a state in which air leaks to such an extent that the cooling in the cooling unit 110 is not affected.

  As shown in FIG. 10, a plurality of holes 141 and 143 for intake air are provided on the right side 31 of the left door 25 </ b> A (door duct 131) and the left side 33 of the right door 25 </ b> B (auxiliary duct 133). It is formed in the direction. The plurality of holes 141 and 143 are formed in accordance with the position of the intake port 123 in the height direction. Here, when the exhaust duct 121 is exhausted, the air existing in the gap between the left door 25A and the right door 25B flows into the door-side duct 131 from the hole 141 and the intake port 123 as indicated by the arrow Q1. From the air inlet 123 to the exhaust duct 121 as well as flowing into the auxiliary duct 133 from the hole 143 as indicated by an arrow Q2.

  As shown in FIG. 11, as described above, the rear surface of the image forming apparatus 10 is covered with the rear cover 117, and the rear cover 117 has a plurality of exhaust holes 119 for exhaust. In FIG. 11, in order to clarify the exhaust port 125, the illustration of the exhaust port 125 and the peripheral exhaust hole 119 is partially omitted. The area of the rear cover 117 in which the plurality of exhaust holes 119 are formed is a rectangular shape having a horizontal length of X3 (> X2) and a vertical length of Z3 (Z2), and thus the area S3 = X3 of this area. × Z3. On the other hand, the exhaust port 125 of the exhaust duct 121 is a rectangular shape having a horizontal length of X2 and a vertical length of Z2, as described in FIGS. 6A and 6B, and intersects the exhaust direction. The cross-sectional area S2 (opening area) = X2 × Z2. Here, since X2 <X3 and Z2 <Z3, the area S3 of the formation region of the exhaust hole 119 is larger than the cross-sectional area S2 of the exhaust port 125.

  Next, the operation of this embodiment will be described.

  First, the image forming process of the image forming apparatus 10 will be described.

  As shown in FIG. 1, when each unit of the image forming apparatus 10 is activated, the image data subjected to image processing by the control unit 13 is converted into color material gradation data of each color and sequentially supplied to the exposure unit 40. Is output. Each exposure unit 40 emits each exposure light L according to the color material gradation data of each color, performs scanning exposure on each photoconductor 18 charged by the scorotron charger 20 (see FIG. 2), and electrostatic latent An image is formed. Then, the electrostatic latent image formed on the photosensitive member 18 (see FIG. 2) is converted into a first special color (V), a second special color (W), yellow (Y), and magenta (M ), Cyan (C), and black (K) as toner images (developer images) of the respective colors, and are developed.

  Subsequently, the toner images of the respective colors sequentially formed on the photoreceptors 18 of the respective image forming units 16V, 16W, 16Y, 16M, 16C, and 16K are converted into six primary transfer rolls 36V, 36W, 36Y, 36M, 36C, Multiple transfer is sequentially performed on the intermediate transfer belt 34 by 36K. The color toner images transferred onto the intermediate transfer belt 34 are secondarily transferred onto the sheet member P conveyed from the paper feed cassette 48 by the secondary transfer roll 62. The sheet member P to which the toner image has been transferred is conveyed by the conveying device 70 toward the fixing unit 82 provided inside the second processing unit 10B.

  Subsequently, the toner images of the respective colors on the sheet member P are fixed on the sheet member P by being heated and pressed by the fixing unit 82. Further, the sheet member P on which the toner image is fixed is cooled by passing through the cooling unit 110, and then sent to the decurling unit 140, and the warp generated in the sheet member P is corrected. Then, the sheet member P whose warpage has been corrected is discharged to the discharge unit 196 by the discharge roll 198.

  On the other hand, when an image is formed on a non-image surface where no image is formed (in the case of duplex printing), the sheet member P is sent to the reversing unit 200 by a switching member (not shown). The sheet member P sent to the reversing unit 200 is reversed through the reversing path 202 and sent to the conveying path 60 provided above the paper feed cassette 48, and a toner image is formed on the back surface by the procedure described above. Is done.

  Next, the cooling action of the cooling device 100 will be described.

  As shown in FIG. 12, when the image forming apparatus 10 is activated, the exhaust fan 128 of the cooling device 100 is driven by the control unit 13 (see FIG. 1). By driving the exhaust fan 128, the inside of the exhaust duct 121 is in a negative pressure state, and the inside of the door side duct 131 continuous with the exhaust duct 121 is also in a negative pressure state. Here, air is introduced into the door duct 131 from the inlet 131A with the left door 25A and the right door 25B closed. The introduced air flows upward in the door side duct 131 and is further sucked into the exhaust duct 121 from the intake port 123. Thus, since air is introduced from the inlet 131A on the bottom surface side of the image forming apparatus 10, it is not necessary to form a hole for introducing air into the left door 25A or the right door 25B. Therefore, the appearance of the image forming apparatus 10 when viewed from the front is not impaired. Note that intake is also performed from the auxiliary duct 133 to the intake port 123.

  Subsequently, as shown in FIG. 4, in the exhaust duct 121, the contact member 124 of the heat sink 122 contacts the heat receiving belt 116 in a planar shape, and the heat absorbed by the heat receiving belt 116 from the sheet member P is in the exhaust duct 121. The sheet member P is deprived of heat and cooled by being radiated from the heat radiating plate 126 to the air flowing through it. Then, as shown in FIGS. 6A and 12, the air in the exhaust duct 121 that has become a high temperature due to heat radiation from the heat radiating plate 126 is exhausted from the exhaust port 125 by the exhaust fan 128, and the rear surface. The air is exhausted from the exhaust hole 119 of the cover 117.

  Here, in the cooling device 100, the door side duct is connected to the left door 25 </ b> A located on the upstream side in the conveyance direction of the sheet member P (the side closer to the fixing unit 82 (see FIG. 2)) of the left door 25 </ b> A and the right door 25 </ b> B. Since 131 is provided, the outside air flows to the upstream side in a higher temperature state than the downstream side in the transport direction. As a result, the cooling efficiency of the sheet member P and the cooling inside the image forming apparatus 10 are improved as compared with the case where the door-side duct 131 is provided on the downstream side in the conveyance direction of the sheet member P. In addition, since the boundary J is provided on the front surface side of the air inlet 123 and the left door 25A and the right door 25B are opened as a double door, the maintenance and inspection of the door side duct 131, the exhaust duct 121, and the heat sink 122 are easy. Just work.

  Further, since the space portion 137 is formed by separating most of the right door 25B located on the downstream side in the conveying direction of the sheet member P from the air inlet 123 to the front side, the air inlet 123 and the right door 25B are in close contact with each other. Compared with the case, the pressure loss due to the flow of the intake air is reduced. Thereby, the flow rate of air to the air inlet 123 increases. Furthermore, the left door 25A and the right door 25B are arranged with a gap d1 at the boundary J, and holes 141 and 143 are formed in the right side surface 31 of the left door 25A and the left side surface 33 of the right door 25B. Since the outside air flows from the gap d1 into the intake port 123 via the holes 141 and 143 and is added to the air flowing in from the introduction port 131A, the flow rate of air to the intake port 123 increases.

  Further, since the holes 141 and 143 are formed in accordance with the height of the intake port 123, the air is compared with the case where the holes 141 and 143 are formed in the entire vertical direction of the right side surface 31 and the left side surface 33. The distribution range is limited. As a result, high-temperature air in the image forming apparatus 10 (air flowing from the fixing unit 82) is prevented from flowing into the image forming apparatus 10 again through the holes 141 and 143.

  Further, since the seal member 129 surrounds the periphery of the air inlet 123 and the front panel 113 (see FIG. 9) extending outward from the air inlet 123 is provided, the high-temperature air (from the fixing unit 82) in the image forming apparatus 10 is provided. The flowing air is subjected to resistance when attempting to flow into the exhaust duct 121 from the contact portion (including the intake port 123) between the door-side duct 131 and the exhaust duct 121. Thereby, high temperature air is suppressed from flowing into the exhaust duct 121.

  As shown in FIGS. 6A and 6B, in the second duct 121B of the exhaust duct 121, the cross-sectional area S2 of the flow path cross section on the downstream side in the exhaust direction is larger than the cross-sectional area S1 of the cross section of the upstream flow path. It has become. Further, the exhaust port 125 and the rear cover 117 are spaced apart. Furthermore, as shown in FIG. 11, the area S3 of the region where the exhaust hole 119 of the rear cover 117 is formed is larger than the cross-sectional area S2 of the exhaust port 125. In any of these configurations, the pressure loss of exhaust at the exhaust port 125 is reduced, so that the exhaust flow rate at the exhaust port 125 increases.

  In addition, this invention is not limited to said embodiment.

  The door duct 131 may be provided not only on the left door 25A located on the upstream side in the conveyance direction of the sheet member P but also on the right door 25B. The seal member 129 is not limited to a sponge, and may be an elastic body that can block air, and may be rubber, for example. Furthermore, instead of the third door 25, a cover member that can be attached to or detached from the housing 11 may be used. Moreover, the heat sink 122 may constitute a part of the exhaust duct 121.

10 Image forming apparatus 11 Housing (apparatus body)
16 Image forming unit (image forming means)
25 Third door (an example of a door)
25A Left door (first covering member)
25B Right door (second covering member)
37 floor 40 exposure unit (image forming means)
82 Fixing unit (fixing means)
100 Cooling device 110 Cooling unit (cooling means)
112 Conveying unit (an example of a recording medium conveying apparatus)
113 Front panel (opposing member)
116 heat receiving belt (an example of a conveyance unit)
117 Rear cover (protective member)
119 Exhaust hole 121 Exhaust duct (exhaust flow path, cooling means, example of second duct)
122 Heat sink (cooling means)
123 Inlet 125 Outlet 128 Exhaust fan (exhaust means, cooling means)
129 Seal member (sealing member)
130 Pressing belt (an example of a transport unit)
131 Door side duct (an example of a flow path member and a first duct)
131A Inlet (example of opening and inlet)
131B Supply Port 141 Hole J Boundary P Sheet Member (Cooling Target, Recording Medium)

Claims (6)

A photosensitive member, a developing device that develops the latent image formed on the photosensitive member with a developer, and a transfer unit that transfers the developer image of the photosensitive member developed by the developing device to a recording medium are internally provided. A first housing provided;
The first body and the parallel beauty, inside a photosensitive member and a developing device for developing with a latent image formed on the photoreceptor developer, a developer image of the photosensitive body is developed by the developing device A second housing without a transfer portion for transferring the image to a recording medium ;
A conveyance unit that is provided in the second casing and conveys a recording medium; a door that is provided on the front surface of the second casing; and a lower part of the door that takes in air outside the second casing. A first duct that is provided in the door and extends upward from a lower portion of the door, and air taken in from the suction port flows from the lower side to the upper side in the vertical direction, and the intake air of the first duct A supply port formed above the opening; a second duct provided in the transport unit; extending rearward from the front surface of the second housing and allowing air from the supply port to flow; and the second duct An exhaust fan that exhausts the air in the outside to the outside of the second duct;
An image forming apparatus.   The image forming apparatus according to claim 1, wherein another door that is kept closed when the door is opened is provided on a front surface of the first housing.   The image forming apparatus according to claim 1, wherein the first duct extends to an upper side than an upper end of the supply port. A photosensitive member, a developing device that develops the latent image formed on the photosensitive member with a developer, and a transfer unit that transfers the developer image of the photosensitive member developed by the developing device to a recording medium are internally provided. The first door is provided on the front surface, and the first door is not formed with a duct in which air taken in from the lower part of the first door flows upward from below in the vertical direction. Body,
A second housing side by side with the first housing;
A transport unit provided in the second housing for transporting a recording medium; a second door provided on a front surface of the second housing; and a lower portion of the second door, the second housing An air intake port through which air outside is taken in and provided in the second door, extends upward from the lower part of the second door, and the air taken in from the air intake port flows from the lower side to the upper side in the vertical direction. A first duct, a supply port formed above the intake port of the first duct, and provided in the transfer unit, extending rearward from the front surface of the second housing, and extending from the supply port A recording medium conveying apparatus comprising: a second duct through which air flows; and an exhaust fan that exhausts air in the second duct to the outside of the second duct;
An image forming apparatus. The image forming apparatus according to claim 4, wherein the first door is maintained in a closed state when the second door is opened. The image forming apparatus according to claim 4, wherein the first duct extends to an upper side than an upper end of the supply port.