JP2008209446A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure that an unfixed paper can be surely sucked and moreover, to reduce the cost of an apparatus. <P>SOLUTION: The image forming apparatus 10 which performs fixing processing of a paper P where transfer processing of a toner image by a photoreceptor drum 121 is performed in an image forming section 12, in a fixing section 13 and then, discharges the paper P after the fixing-processing to a paper discharge section 15, is provided with a suction fan 30 for sucking the non-transfer surface opposite to the toner-image transfer surface of the paper P, in the paper conveying path 127 between the image forming section 12 and the fixing section 13. The peripheral portion orthogonal to the sucking direction, of the suction fan 30 is surrounded by a square cylindrical frame body 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides an image forming apparatus configured to discharge a sheet after the fixing process to the outside of the apparatus main body after the fixing process is performed on the sheet on which the toner image is transferred by the image forming unit. It is about.

  Conventionally, an image forming apparatus as described in Patent Document 1 is known. In this image forming apparatus, a detachable image forming unit (the cartridge 10 in Patent Document 1) having a photosensitive drum, a developing device, and the like formed in the apparatus main body is provided. The toner image is transferred onto the paper supplied from the paper feed cassette. The sheet on which the toner image is transferred is conveyed toward a fixing unit (fixing unit 11 in Patent Document 1) disposed above the image forming unit, where the fixing process of the toner image on the sheet is performed. Applied. The sheet after the fixing process is discharged to the outside.

  In such an image forming apparatus, a suction fan (a side hole fan 20 in Patent Document 1) is provided in the paper conveyance path between the image forming unit and the fixing unit, and the non-feed of the paper being conveyed through the paper conveyance path. The transfer surface side is sucked. This prevents the sheet being conveyed in the sheet conveyance path from contacting the transfer surface on which the unfixed toner image is formed with the wall surface of the sheet conveyance path or other members. The toner image is prevented from being disturbed.

The suction fan is provided with a rectangular frame that surrounds the outer periphery of the suction fan, and an air flow is circulated through the frame by driving the suction fan.
Japanese Patent Laid-Open No. 11-84731

  By the way, in the above-described paper suction method described in Patent Document 1, since slits are formed on each side surface of a rectangular frame surrounding the suction fan, these are driven by the suction fan. Since air is also sucked from the slits, there is a disadvantage that the suction force for the paper is weakened. In order to eliminate such inconvenience, it is necessary to employ a suction fan having an excessive capacity, but this raises a new problem that the apparatus cost increases.

  The present invention has been made to solve the conventional problems, and it is possible to achieve a reduction in apparatus cost while ensuring that unfixed paper can be reliably sucked. An object of the present invention is to provide an image forming apparatus including a suction fan.

  According to a first aspect of the present invention, there is provided an image forming unit for performing a transfer process of a toner image on a sheet, a fixing unit for performing a fixing process on the sheet after the transfer process, and the image forming unit provided in a predetermined apparatus body And a sheet conveying path formed between the fixing unit and a suction fan for sucking a transfer surface opposite to the toner image transfer surface of the sheet in the sheet conveying path. A peripheral portion orthogonal to the outer periphery is surrounded by a frame without holes.

  According to such a configuration, the sheet from the image forming unit to the fixing unit is conveyed along the sheet conveyance path while the non-transfer surface is sucked by the suction fan, so that the transfer surface of the sheet on which the toner image is formed is This prevents the toner image formed on the transfer surface of the paper from being disturbed without contacting the wall surface of the paper transport path or other members.

  The suction fan is surrounded by a frame without a hole in the periphery perpendicular to the suction direction, so that the air sucked by the suction fan is rectified by eliminating the airflow from the side. A large suction force can be obtained. Therefore, it is not necessary to set the capacity of the suction fan excessively as in the case where a hole (slit) is provided in the conventional frame body, which contributes to making the suction fan compact and reducing the apparatus cost.

  According to a second aspect of the present invention, in the first aspect of the present invention, the apparatus main body is provided with a maintenance door that opens the paper conveyance path, and the suction fan is provided on the maintenance door. It is characterized by this.

  According to such a configuration, since the suction fan is provided on the maintenance door that is opened for maintenance work and paper jam clearing work, the apparatus is compared with the case where the suction fan is provided on the other part. The capacity of the main body can be reduced, which also contributes to the downsizing of the image forming apparatus.

  According to a third aspect of the present invention, in the second aspect of the present invention, when the double-sided printing is performed on the maintenance door, the maintenance door is subjected to a printing process on one side and once discharged from the apparatus main body. A reverse feed conveyance path for reverse feed is provided.

  According to such a configuration, it is possible to reduce the capacity of the apparatus main body as compared with the case where the reverse conveyance path is provided in the apparatus main body, thereby contributing to the compactness of the image forming apparatus. Can do.

  According to the image forming apparatus of the present invention, since the peripheral portion orthogonal to the suction direction is surrounded by the frame without a hole, the suction fan uses the air sucked by the suction fan as the airflow from the side portion. It can be eliminated and rectified. In this state, since a large suction force for the sheet being conveyed is obtained, it is not necessary to set the capacity of the suction fan excessively, which contributes to the compactness of the suction fan and the reduction of the device cost. be able to.

  FIG. 1 is a perspective view showing an embodiment of an image forming apparatus 10 according to the present invention. FIG. 1A shows a state in which a maintenance door 20 is closed, and FIG. 1B shows a maintenance door. 20 shows an open state. FIG. 2 is a front sectional view for explaining an outline of the internal structure of the image forming apparatus 10. 1 and 2, the XX direction is referred to as the left-right direction, and the Y-Y direction is referred to as the front-rear direction. In particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is frontward, and the + Y direction is rearward. That's it.

  An image forming apparatus 10 shown in FIG. 1 is a so-called in-body discharge type copying machine, and includes an image forming unit 12, a fixing unit 13, a sheet storage unit 14, and a discharge unit 15 in an apparatus main body 11. An image reading unit 16, an operation unit 17, and a paper suction unit 18 are formed.

  The apparatus main body 11 includes a lower main body 111 having a rectangular parallelepiped shape in appearance, an upper main body 112 having a flat rectangular parallelepiped shape disposed above the lower main body 111, and the upper main body 112 and the lower main body 111. And a connecting body 113 interposed therebetween. The connecting body 113 is a structure for connecting the discharge body 15 between the lower main body 111 and the upper main body 112 to each other, and is erected from the left part of the lower main body 111. Yes. The upper main body 112 is supported at the upper end portion of the connecting body 113 at the left side.

  The lower main body 111 includes an image forming unit 12, a fixing unit 13, and a paper storage unit 14, and an image reading unit 16 is mounted on the upper main body 112.

  The paper discharge unit 15 is formed between the lower main body 111 and the upper main body 112. The paper discharge unit 15 has a cylinder discharge tray 151 formed on the upper surface of the lower main body 111, and the paper P onto which the toner image from the image forming unit 12 has been transferred is transferred from the lower part of the coupling body 113 to the cylinder P. The paper is discharged toward the inner paper discharge tray 151.

  Hereinafter, the image forming unit 12 will be described with reference to FIG. The image forming unit 12 forms a toner image on the paper P fed from the paper storage unit 14, and is sequentially arranged from the upstream side (right side) to the downstream side as shown in FIG. A magenta unit 12M, a cyan unit 12C, a yellow unit 12Y, and a black unit 12K.

  Each unit 12M, 12C, 12Y, and 12K includes a photosensitive drum 121 and a developing device 122, respectively. Each photosensitive drum 121 is supplied with toner from a corresponding developing device 122 while rotating counterclockwise in FIG. Each developing device 122 is replenished with toner from a toner cartridge (not shown) disposed on the front side of the apparatus main body 11 (the front side of the paper surface of FIG. 2).

  A charger 123 is provided immediately below each photoconductor drum 121, and an exposure device 124 is provided further below each charger 123. Each photosensitive drum 121 is charged uniformly by the charger 123, and laser light corresponding to each color based on the image data read by the image reading unit 16 is charged from each exposure device 124. By irradiating the peripheral surface of each photoconductive drum 121, an electrostatic latent image is formed on the peripheral surface of each photoconductive drum 121. By supplying toner from the developing device 122 to the electrostatic latent image, a toner image is formed on the peripheral surface of the photosensitive drum 121.

  A transfer belt 125 stretched between the driving roller 125 a and the driven roller 125 b is provided at a position above the photosensitive drum 121 so as to contact the photosensitive drum 121.

  The transfer belt 125 is driven against a peripheral surface of the photosensitive drum 121 by a transfer roller 125c provided corresponding to each photosensitive drum 121, and is driven with a driving roller 125a and a driven roller while being synchronized with the photosensitive drum 121. Circulate between 125b.

  Accordingly, when the transfer belt 125 circulates, the magenta toner image is transferred onto the surface of the transfer belt 125 by the photosensitive drum 121 of the magenta unit 12M, and then the photosensitive drum of the cyan unit 12C is placed at the same position on the transfer belt 125. The transfer of the cyan toner image by 121 is performed in the overcoating state, and then the transfer of the yellow toner image by the photosensitive drum 121 of the yellow unit 12Y to the same position of the transfer belt 125 is performed in the overcoating state. The transfer of the black toner image by the photosensitive drum 121 of the black unit 12K is performed in the overcoating state.

  As a result, a color image is formed on the surface of the transfer belt 125. The color image formed on the surface of the transfer belt 125 is transferred to the paper P conveyed from the paper storage unit 14.

  A drum cleaning device 126 that removes and cleans residual toner on the circumferential surface of the photosensitive drum 121 is provided at the right side of each photosensitive drum 121 in FIG. The peripheral surface of the photosensitive drum 121 cleaned by the drum cleaning device 126 is directed to the charger 123 for a new charging process.

  Waste toner removed from the peripheral surface of the photosensitive drum 121 by the drum cleaning device 126 is collected in a toner collection bottle (not shown) through a predetermined path.

  A sheet conveyance path 127 extending in the vertical direction is provided at the left position of the image forming unit 12. The paper transport path 127 is provided with a transport roller pair 127a at an appropriate position, and the paper P from the paper storage unit 14 is directed toward the transfer belt 125 that is wound around the drive roller 125a by the drive of the transport roller pair 127a. Be transported.

  A second transfer roller 128 that contacts the surface of the transfer belt 125 is provided in a position opposite to the driving roller 125 a in the sheet conveyance path 127, and the sheet P being conveyed through the sheet conveyance path 127 is transferred to the transfer belt 125. The toner image on the transfer belt 125 is transferred to the paper P by being pressed and clamped by the second transfer roller 128.

  A belt cleaning device 125d (not shown) for removing residual toner remaining on the surface of the transfer belt 125 is provided on the right side of the transfer belt 125. Residual toner on the surface is removed by the belt cleaning device 125d and cleaned, and circulated toward the next transfer process.

  The fixing unit 13 performs a fixing process on the toner image on the paper P transferred by the image forming unit 12. The fixing unit 13 includes a fixing roller 131 provided with an energization heating element serving as a heating source therein, and a pressure roller 132 disposed opposite to the fixing roller 131 on the left side. Then, the transfer-processed paper P led out from the image forming unit 12 through the second transfer roller 128 is pressed and held between the fixing roller 131 and the pressure roller 132, and the toner image is heated by the fixing roller 131. Is fixed, and a stable color image is formed on the paper P.

  The color-printed paper P that has undergone the fixing process passes through a paper discharge conveyance path 129 extending from the upper part of the fixing unit 13 and is discharged toward the in-body paper discharge tray 151 through the discharge roller pair 152. .

  The paper storage unit 14 includes a paper tray 141 that is detachably mounted at a position below the exposure device 124 in the apparatus main body 11 and stores the storage of the paper bundle. In the present embodiment, the paper tray 141 is provided in two stages. Then, the sheet P is fed out from the sheet bundle stored in the sheet tray 141 one by one by driving the pickup roller 142, and introduced into the image forming unit 12 through the sheet conveyance path 127.

  The image reading unit 16 presses the contact glass 161 mounted on the upper surface opening of the upper main body 112 on which the document P1 is placed with the document surface facing down, and the document placed on the contact glass 161. An original mat 162 that can be opened and closed with respect to the contact glass 161, and an optical system unit 163 that is built in the upper body 112 for reading the original image of the original P1 placed on the contact glass 161. ing.

  The optical system unit 163 irradiates light from the light source 164 toward the document image via the contact glass 161 from below while the document placed on the contact glass 161 is pressed by the document mat 162. The CCD (charge coupled device) 165 reads the image information of the document P1 based on the reflected light from the document surface during scanning by the movement of the light source 164. Image information read by the CCD 165 is output to the exposure device 124 of the image forming unit 12 after being digitized.

  The operation unit 17 (FIG. 1) is used to input information related to image forming processing such as the number of copies and the size of the paper P to the image forming apparatus. In the present embodiment, the upper body 112 is operated. It protrudes toward the front from the front edge. On the upper surface of the operation unit 17, a power switch, a start key, a numeric keypad, an LCD (Liquid crystal display), and the like are provided.

  The paper suction unit 18 passes through the nip portion N between the second transfer roller 128 and the transfer belt 125 in the paper transport path 127 and moves up to the fixing unit 13 to the left. Suction toward Such suction prevents the image forming surface of the paper P from coming into contact with the right wall surface of the paper transport path 127, thereby preventing the unstable toner image before the fixing process from being disturbed.

  The sheet suction unit 18 includes a maintenance door 20 provided on the upper left side of the lower main body 111 (FIG. 1) of the apparatus main body 11 so as to be openable and closable corresponding to the image forming unit 12 and the fixing unit 13. A suction fan 30 attached to the door 20 is provided.

  Hereinafter, the maintenance door 20 and the suction fan 30 of the sheet suction unit 18 will be described based on FIGS. 3 to 5 and with reference to FIGS. 1 and 2 as necessary.

  3 and 4 are perspective views showing an embodiment of the maintenance door 20 and the suction fan 30. FIG. 3 shows a state in which the cover plate 25 is removed from the duplex printing conveyance path member 22, and FIG. The cover plate 25 is shown attached to the conveyance path member 22 for double-sided printing. FIG. 5 is a cross-sectional view taken along line VV in FIG. In FIG. 5, the shape of the double-sided printing conveyance path member 22 is shown in a simplified manner, and members around the double-sided printing conveyance path member 22 are also shown. Incidentally, the direction display by X and Y in FIGS. 3 to 5 is the same as in FIG. 1 (X is the left-right direction (−X: leftward, + X: rightward), Y is the front-back direction (−Y: forward, + Y: backward)).

  First, as shown in FIG. 1, the maintenance door 20 has a rectangular maintenance opening 115 provided at a central portion in the vertical direction of the left side plate (left side plate 114) of the apparatus main body 11, and a lower end edge portion. The support shaft 201 is provided so as to be pivotable, and the posture can be changed between a closed posture (FIG. 1A) in which the maintenance opening 115 is closed and an open posture in which the maintenance opening 115 is opened. Yes.

  As shown in FIG. 5, the maintenance door 20 has an upper portion opposed to the fixing unit 13 in a closed posture, and a portion from the center portion to the lower portion between the second transfer roller 128 and the transfer belt. It faces the paper transport path 127 above the nip N between the nip 125 and the nip 125.

  On the other hand, a plurality of cooling fins 134 (FIGS. 1B and 5) are provided in front of the housing 133 in which the fixing roller 131 and the pressure roller 132 which are constituent elements of the fixing unit 13 are housed. ing. In addition, a partition plate 135 is provided in front of the cooling fins 134, and a line is defined between the fixing unit 13 side and the maintenance door 20 side by the partition plate 135. A heat radiation port 135 a is opened at a position facing the cooling fin 134 on the partition plate 135. By providing the heat radiation port 135a, heat generated in the fixing unit 13 is prevented from being trapped in the apparatus main body 11.

  A plurality of conveying fins 127b are provided below the fixing unit 13 so as to hang from a substantially central portion in the left-right direction of the fixing unit 13 toward a position slightly above the driving roller 125a. These transport fins 127b are arranged at a predetermined pitch in the front-rear direction (direction orthogonal to the paper surface of FIG. 5), and the plurality of paper transport paths 127 and the right surface of the maintenance door 20 set in the closed posture. A sheet conveying path 127 above the second transfer roller 128 is formed between the two.

  The maintenance door 20 includes a front plate 21 formed in a rectangular shape slightly smaller than the maintenance opening 115 and a double-sided printing conveyance path member 22 formed on the back side (right side) of the front plate 21. I have. A plurality of slits 202 are formed at appropriate positions on the cover plate 21, and air circulates inside and outside the apparatus main body 11 through these slits 202. In the present embodiment, two suction fans 30 are mounted at appropriate positions on the upper part of the conveyance path member 22 for double-sided printing.

  As shown in FIG. 3, the double-sided printing conveyance path member 22 is formed by arranging a plurality of conveyance fins 222 in parallel at a regular pitch between a pair of side plate members 221 in the front-rear width direction. The sheet conveyance path 127 above the second transfer roller 128 is formed between the right end edge surface of the plurality of conveyance fins 222 and the left end edge surface of the plurality of conveyance fins 127b on the apparatus main body 11 side. ing.

  In such a maintenance door 20, a reverse conveyance path 23 for double-sided printing is formed between the front panel 21 and the partition plate 135 and between the front panel 21 and the double-sided printing conveyance path member 22. In the portion facing the lower end portion of the reverse feeding path 23 on the apparatus main body 11 side, the paper P that has been fed back and lowered from the in-body sheet discharge tray 151 by the reverse drive of the discharge roller pair 152 (FIG. 2). A folded portion 231 is formed that is folded upward and led to the nip portion N.

  Therefore, when performing the duplex printing process, the sheet that has been subjected to the fixing process on the toner image on one side (the right side in FIG. 5) and is temporarily discharged halfway to the in-body discharge tray 151 is the reverse of the discharge roller pair 152. The drive is returned to the reverse conveyance path 23 of the maintenance door 20, and returned to the nip portion N between the second transfer roller 128 and the transfer belt 125 in a state where the front and back are reversed through the folding portion 231, where A transfer process is performed on the back side.

  As shown in FIG. 3, the pair of suction fans 30 is supported by a notch portion in which a part of the transport fin 222 is cut out at a substantially front and rear target position above the transport path member 22 for double-sided printing. In addition, it is attached to a rectangular tubular frame (frame) 24 in which no holes or slits are formed.

  The suction fan 30 is driven horizontally by a fan main body 31 having a circular hole in the center and a plurality of radial support rods disposed at the center of the circular hole of the fan main body 31. A motor 32 and a plurality of fans 33 fixed radially to the drive shaft of the drive motor 32 are provided. The rotation direction of the drive motor 32 is set so that the fan 33 sucks the air in the paper transport path 127.

  Accordingly, when the suction fan 30 is driven, the paper P from the nip portion N passes through the paper transport path 127, so that the paper P is sucked by the suction fan 30 and the double-sided printing transport path member 22. Therefore, the surface of the paper P on which the toner image is formed is prevented from coming into contact with the transport fin 127b. This prevents inconvenience that the unfixed toner image on the paper P is disturbed by contact with the conveying fins 127b.

  In such a double-sided printing conveyance path member 22, in the present embodiment, a cover plate 25 is provided to cover the upper part on the left side (reverse conveyance path 23 side). The cover plate 25 is formed with vent holes 251 at positions corresponding to the suction fans 30. Therefore, in a state where the cover plate 25 is attached to the double-sided printing conveyance path member 22, as shown in FIG. 4, the respective circular holes 251 face the respective suction fans 30. The exhausted air is exhausted through these circular holes 251.

  The cover plate 25 constitutes a part of the reverse feed path 23. Then, the paper P that has been reversely fed by the reverse drive of the discharge roller pair 152 is smoothly conveyed without interfering with other members such as the suction fan 30 by passing through the surface (left surface) of the cover plate 25. .

  As described in detail above, the image forming apparatus 10 according to the present invention performs the fixing process on the paper P on which the toner image is transferred by the photosensitive drum 121 in the image forming unit 12, after the fixing unit 13 performs the fixing process. The sheet P after the fixing process is configured to be discharged to the sheet discharge unit 15, and is opposite to the transfer surface of the toner image on the sheet P in the sheet conveyance path 127 between the image forming unit 12 and the fixing unit 13. A suction fan 30 for sucking the non-transfer surface on the side is provided, and the suction fan 30 is surrounded by a rectangular tube frame 24 having no hole at a peripheral portion orthogonal to the suction direction.

  According to such a configuration, the paper P traveling from the image forming unit 12 to the fixing unit 13 is transported along the paper transport path 127 while its non-transfer surface is sucked by the suction fan 30. The formed transfer surface does not come into contact with the wall surface of the paper conveyance path 127 and other members, and this can prevent the toner image formed on the transfer surface of the paper P from being disturbed.

  The suction fan 30 is surrounded by a square cylindrical frame 24 having no holes in the peripheral portion (that is, the peripheral surface of the fan main body 31) orthogonal to the suction direction, and the air sucked by the suction fan 30 is Since the rectangular tubular frame 24 eliminates the airflow from the side and is in a rectified state, a large suction force can be obtained. Therefore, it is not necessary to set the capacity of the suction fan 30 excessively, and this can contribute to the compactness of the suction fan 30 and the reduction of the device cost.

  Further, since the suction fan 30 is provided on the maintenance door 20 that is opened for maintenance work and paper jam clearing work, the main body of the apparatus is compared with the case where the suction fan 30 is provided for other parts. 11 can be reduced, and the image forming apparatus 10 can be made compact.

  Further, when performing double-sided printing on the paper P, the maintenance door 20 is subjected to a printing process on one side, and reverse transport for reversely transporting the paper P once discharged to the in-body discharge tray 151. Since the path 23 is provided, the capacity of the apparatus main body 11 can be reduced as compared with the case where the reverse conveyance path 23 is provided in the apparatus main body 11, and also by this, the image forming apparatus It can contribute to 10 downsizing.

  The present invention is not limited to the above embodiment, and includes the following contents.

  (1) In the above embodiment, a copying machine has been described as an example of the image forming apparatus 10, but a facsimile machine, a printer, or the like may be used instead of the copying machine.

  (2) The image forming apparatus 10 of the present invention is not limited to the one for color printing as in the above-described embodiment, and may be for black color so-called monochrome printing.

  (3) The image forming apparatus 10 of the present invention employs the so-called vertical conveyance method of the above-described embodiment in which the paper P after the transfer process in the image forming unit 12 is conveyed upward toward the fixing unit 13. It is not limited to this, and a so-called horizontal conveyance method in which the paper P after the transfer process is conveyed in the horizontal direction toward the fixing unit 13 may be used.

  (4) In the above embodiment, the rectangular tubular frame 24 is adopted as the frame surrounding the suction fan 30, but the rectangular frame according to the present invention is a square rectangular tubular frame 24. It is not limited to a certain thing, The thing of cylindrical shape and various polygonal shapes may be sufficient.

1A and 1B are perspective views illustrating an embodiment of an image forming apparatus according to the present invention, in which FIG. 3A illustrates a state in which a maintenance door is closed, and FIG. 3B illustrates a state in which a maintenance door is opened. . It is explanatory drawing of front sectional view for demonstrating the outline of the internal structure of an image forming apparatus. It is a perspective view which shows one Embodiment of the maintenance door 20 and the suction fan 30, and has shown the state from which the cover board was removed from the conveyance path member for double-sided printing. It is a perspective view which shows the state in which the cover board was attached to the conveyance path member for double-sided printing of the maintenance door shown in FIG. It is the VV sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 11 Apparatus main body 111 Lower main body 112 Upper main body 113 Connection body 114 Left side plate 115 Maintenance opening 12 Image forming part 12C Cyan unit 12K Black unit 12M Magenta unit 12Y Yellow unit 121 Photosensitive drum 122 Developing device 123 Charging Device 124 Exposure Device 125 Transfer Belt 125a Drive Roller 125b Driven Roller 125c Transfer Roller 125d Belt Cleaning Device 126 Drum Cleaning Device 127 Paper Conveying Route 127a Conveying Roller Pair 127b Conveying Fin 128 Transfer Roller 129 Discharge Conveying Route 13 Fixing Unit 131 Fixing Roller 132 Pressure roller 133 Housing 134 Cooling fin 135 Partition plate 135a Heat radiation port 14 Paper storage part 141 Paper tray 142 Picker Roller 15 Discharge unit 151 In-cylinder discharge tray 151 In-cylinder discharge tray 152 Discharge roller pair 16 Image reading unit 161 Contact glass 162 Document mat 163 Optical system unit 164 Light source 17 Operation unit 171 Operation unit 18 Paper suction unit 20 Maintenance Door 201 Support shaft 202 Slit 21 Front panel 22 Double-sided printing transport path member 221 Side plate member 222 Transport fin 23 Reverse transport path 231 Folding section 24 Square cylindrical frame (frame body) 25 Cover plate 251 Circular hole 30 Suction fan 31 Fan body 32 Drive motor 33 Fan N Nip part P Paper P1 Document

Claims (3)

An image forming unit provided in a predetermined apparatus body for performing a toner image transfer process on paper;
A fixing unit that performs fixing processing on the paper after the transfer processing;
A paper conveyance path formed between the image forming unit and the fixing unit;
A suction fan for sucking a transfer surface opposite to the toner image transfer surface of the paper in the paper transport path,
The image forming apparatus according to claim 1, wherein the suction fan is surrounded by a frame having no holes at a peripheral portion orthogonal to the suction direction. The apparatus main body is provided with a maintenance door that opens the paper conveyance path,
The image forming apparatus according to claim 1, wherein the suction fan is provided on the maintenance door.   The maintenance door is provided with a reverse conveyance path for reversely feeding the paper once subjected to the printing process when the double-sided printing is performed on the paper. The image forming apparatus according to claim 2.

Images