JP5509115B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus including a cover for opening a paper discharge path.

  A post-processing apparatus that performs post-processing such as punching processing and stapling processing on a sheet after image formation may be optionally attached to the copier. In this case, the sheet that has exited from the discharge port of the copier is directly conveyed to the post-processing apparatus. However, even when no post-processing is performed, the sheet is conveyed to the post-processing apparatus and discharged to the discharge tray of the apparatus. Accordingly, there is a problem that the paper discharge time is increased due to the length of the conveyance path for discharge, and the paper discharge is not performed when the post-processing device fails.

  Therefore, as described in Patent Document 1, an apparatus having a plurality of outlets has been proposed. If you do not perform post-processing by using multiple outlets separately for the outlet that conveys to the post-processing device and the outlet that discharges directly from the copier, you can remove the paper directly from the copier without going through the post-processing device. It can be discharged.

JP-A-8-67395

  In the copying machine configured as described above, when a jam occurs in the vicinity of the discharge port, the user opens the cover on the side of the copying machine (the side on which the post-processing device is installed) and takes out the jammed paper. In other words, after the connection between the copier and the post-processing device is released and the post-processing device is moved, it is necessary to open the side cover of the copier and take out the paper. It was.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus with improved jam handling performance when a jam occurs in the vicinity of a discharge port.

An image forming apparatus according to a first aspect of the present invention includes an apparatus main body having a housing structure having an upper surface and side surfaces, an image forming unit that is accommodated in the apparatus main body and forms an image on a sheet, and the apparatus main body. A first paper discharge port provided on one side surface, a second paper discharge port provided on the one side surface in the vicinity of the upper surface and above the first paper discharge port; A main transport path for transporting paper toward the paper discharge port, a sub-transport path for branching from the main transport path and transporting the paper to the second paper discharge port from below to above, and the sub-transport path A rotation fulcrum extending in a direction perpendicular to the sheet conveyance direction on the upstream side of the sheet conveyance direction , forming an upper surface wall of the sub conveyance path, and rotating about the rotation fulcrum from the sub conveyance path openable said sub-passage by separating And the guide member, is formed inside the device body, the device has an opening formed on the upper surface of the body upwards, a space in which the guide member is arranged rotatably, the upper surface of the device body between the guide member and is provided opposite to openably in part, a closed position to close the opening, opened posture to open an upper portion of the guide member through the opening to the outside of the apparatus main body in And a biasing member that biases the guide member in a direction in which the sub-transport path is closed, and in the open posture of the cover, the guide member is biased in the space portion. When against the biasing force of the member is rotated to the rotation fulcrum, the sub-passage is shall be opened to the outside of the apparatus main body through the opening.

According to this configuration, when a jam occurs in the sub conveyance path, the user can open the sub conveyance path by rotating the guide member around the rotation fulcrum after opening the cover. As a result, the paper jammed in the sub-transport path can be removed, and the jam processing can be easily performed. Further, according to this configuration, the guide member is rotated around the rotation fulcrum, so that the guide member is separated from the sub-transport path, so that the sub-transport path can be opened to the outside. As a result, the paper jammed in the sub-transport path can be removed, and the jam processing can be easily performed.

The invention according to claim 2 is the image forming apparatus according to claim 1, wherein the cover is on the downstream side in the sheet transport direction of the sub transport path when viewed from the guide member, and And an open / close fulcrum disposed above the second paper discharge port, and constitute a part of the one side surface of the apparatus main body above the second discharge port, and rotate upward around the open / close fulcrum By doing so, the open posture is obtained.

According to this configuration , when a jam occurs in the sub-transport path, the user can immediately open the cover, and the paper jammed in the sub-transport path can be removed by rotating the guide member.

The invention according to claim 3 is the image forming apparatus according to claim 2, further comprising a second device body that can be opened and closed with respect to the upper surface mounted on the upper surface of the device body. The second apparatus main body has a chamfered portion at a corner of the lower surface of the second apparatus facing the cover.

According to this configuration, since the leading edge of the cover does not interfere with the corner of the second device body, the cover can be opened regardless of whether the second device body is opened or closed. Moreover, a wide opening can be secured when the cover is opened, and fingers can be easily put into the sub-transport path from the opening.

According to a fourth aspect of the present invention, in the image forming apparatus according to any one of the first to third aspects, the image forming apparatus is disposed upstream of the sub-transport path in the paper transport direction, and transports the paper. A first transport roller pair that is disposed downstream of the sub transport path in the paper transport direction, and further includes a second transport roller pair that transports the paper, and the first transport roller pair is rotationally driven. A first driven roller, and a first driven roller that is disposed to face the first drive roller across the sub-transport path and rotates following the first drive roller, and the second driven roller. The transport roller pair includes a second drive roller that is rotationally driven, a second driven roller that is disposed to face the second drive roller across the sub-transport path, and that rotates following the second drive roller. The first driven roller And the second driven roller is rotatably supported by the guide member, and when the guide member rotates about the rotation fulcrum and moves away from the sub-transport path, the first driven roller and the second driven roller A roller is separated from the first drive roller and the second drive roller, and the guide member has a shape that covers the first driven roller and the second driven roller in the open posture of the cover. It is.

According to this configuration, the image forming apparatus includes the first transport roller pair and the second transport roller pair.

  According to the present invention, when a jam occurs in the sub conveyance path, the user can open the sub conveyance path by rotating the guide member around the rotation fulcrum after opening the cover. As a result, the paper jammed in the sub-transport path can be removed, and the jam processing can be easily performed.

1 is a cross-sectional view showing an internal structure of an image forming apparatus according to an embodiment of the present invention. Sectional drawing which shows the structure of a 1st, 2nd discharge path. Sectional drawing which shows the structure of a 2nd discharge path. Sectional drawing which shows the structure of a 2nd discharge path. The perspective view which shows the structure of a 2nd discharge path. The perspective view for demonstrating the chamfering part of an automatic document feeder.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an internal structure of an image forming apparatus 1 according to an embodiment of the present invention. Here, a copying machine is illustrated as the image forming apparatus 1, but the image forming apparatus may be a printer, a facsimile machine, or a multifunction machine having these functions.

  The image forming apparatus 1 includes an apparatus main body 10 having a substantially rectangular parallelepiped housing structure, and an automatic document feeder 20 disposed on the apparatus main body 10. Inside the apparatus main body 10, a reading unit 25 that optically reads a document image to be copied, an image forming unit 30 that performs image forming processing on a sheet, and a sheet feeding unit that stores sheets conveyed to the image forming unit 30 40 and a transport path 50 for transporting paper from the paper feed unit 40 to the paper discharge port 10E via the image forming unit 30 are accommodated.

  The automatic document feeder 20 is attached to the upper surface 10T of the apparatus body 10 so as to be freely opened and closed. The automatic document feeder 20 automatically feeds a document to be copied toward an automatic document reading position (a position where the first contact glass 241 is assembled) in the apparatus body 10. On the other hand, when the user manually places the document on a predetermined document reading position (position of the second contact glass 242), the automatic document feeder 20 is opened upward. The automatic document feeder 20 includes a document tray 21 on which a document is placed, a document transport unit 22 that transports the document via an automatic document reading position, and a document discharge tray 23 on which the document after scanning is discharged. including.

  Further, the corner facing the cover 74 on the left side surface 10 </ b> L side of the automatic document feeder 20 is chamfered, and this portion is referred to as a chamfered portion 29. The chamfered portion 29 will be described in detail later.

  The reading unit 25 passes through a first contact glass 241 for reading a document automatically fed from the automatic document feeder 20 on the upper surface of the apparatus body 10 or a second contact glass 242 for reading a manually placed document. The image of the original is optically read. In the reading unit 25, a scanning mechanism including a light source, a movable carriage, a reflection mirror, and the like, and an image sensor are accommodated (not shown). The scanning mechanism irradiates the document with light and guides reflected light reflected from the document to the image sensor. The image sensor photoelectrically converts the reflected light into an analog electric signal. The analog electric signal is converted into a digital electric signal by an A / D conversion circuit and then input to the image forming unit 30.

  The image forming unit 30 includes an image forming unit 31 that generates a toner image and transfers the toner image onto a sheet, and a fixing unit 36 that fixes the toner image on the sheet. The image forming unit 31 includes four units 32Y, 32M, and 32C that form yellow (Y), magenta (M), cyan (C), and black (Bk) toner images in order to form a full-color toner image. , 32Bk, an intermediate transfer unit 33 disposed adjacent to the image forming unit 32, and a toner replenishing unit 34 disposed on the intermediate transfer unit 33.

  Each of the image forming units 32Y, 32M, 32C, and 32Bk includes a photosensitive drum 321 and a charger 322, an exposure device 323, a developing device 324, a primary transfer roller 325, and a cleaning device disposed around the photosensitive drum 321. 326.

  The photosensitive drum 321 rotates about its axis, and an electrostatic latent image and a toner image are formed on its peripheral surface. As the photosensitive drum 321, a photosensitive drum using an amorphous silicon (a-Si) material can be used. The charger 322 uniformly charges the surface of the photosensitive drum 321. The exposure device 323 includes a laser light source and optical system devices such as a mirror and a lens, and forms an electrostatic latent image by irradiating the peripheral surface of the photosensitive drum 321 with light based on image data of a document image. .

  The developing device 324 supplies toner to the peripheral surface of the photosensitive drum 321 in order to develop the electrostatic latent image formed on the photosensitive drum 321. The developing device 324 is for a two-component developer and includes a stirring roller, a magnetic roller, and a developing roller. The stirring roller charges the toner by circulating and conveying the two-component developer while stirring. A two-component developer layer is carried on the circumferential surface of the magnetic roller, and a toner layer formed by the transfer of toner by a potential difference between the magnetic roller and the developing roller is carried on the circumferential surface of the developing roller. The The toner on the developing roller is supplied to the peripheral surface of the photosensitive drum 321 and the electrostatic latent image is developed.

  The primary transfer roller 325 forms a nip portion with the photosensitive drum 321 across the intermediate transfer belt 331 provided in the intermediate transfer unit 33, and the toner image on the photosensitive drum 321 is primary transferred onto the intermediate transfer belt 331. To do. The cleaning device 326 includes a cleaning roller and the like, and cleans the peripheral surface of the photosensitive drum 321 after the toner image is transferred.

  The intermediate transfer unit 33 includes an intermediate transfer belt 331, a driving roller 332, a driven roller 333, and a tension roller 334. The intermediate transfer belt 331 is an endless belt laid around these rollers 332, 333 and 334, and toner images from a plurality of photosensitive drums 321 are overcoated on the outer peripheral surface of the intermediate transfer belt 331 (primary). Transcription). The driving roller 332 is a roller to which a driving force for rotating the intermediate transfer belt 331 is applied, and a secondary transfer roller 35 is disposed to face the peripheral surface. A nip portion between the driving roller 332 and the secondary transfer roller 35 becomes a secondary transfer portion 35A that transfers a full-color toner image overcoated on the intermediate transfer belt 331 onto a sheet. The driven roller 333 is a roller that is driven according to the rotation of the intermediate transfer belt 331, and the tension roller 334 is a roller that applies a predetermined tension to the intermediate transfer belt 331.

  The toner supply unit 34 includes a yellow toner container 34Y, a magenta toner container 34M, a cyan toner container 34C, and a black toner container 34Bk. These toner containers 34Y, 34C, 34M, and 34Bk respectively store toner of each color, and pass through a supply path (not shown) to the developing devices 324 of the image forming units 32Y, 32M, 32C, and 32Bk corresponding to each color of YMCBk. Supply toner of each color.

  The fixing unit 36 includes a fixing roller 361 provided on the outer periphery with a fixing belt heated by an induction heating method, and a pressure roller 362 that is pressed against the fixing roller 361 to form a fixing nip portion. The paper on which the toner image is secondarily transferred in the secondary transfer portion 35A passes through the fixing nip portion, and is heated and pressurized, whereby the toner image is fixed on the paper surface.

  The paper feed unit 40 includes two-stage paper feed cassettes 40A and 40B that store paper on which image forming processing is performed. These paper feed cassettes 40A and 40B can be pulled out from the front of the apparatus main body 10 in the front direction. The paper feeding cassettes 40A and 40B are cassettes provided for automatic paper feeding. On the right side surface 10R of the apparatus main body 10, a paper feeding tray 46 for manual paper feeding is also provided. The paper feed tray 46 is attached to the apparatus main body 10 at its lower end so as to be freely opened and closed. When manually feeding paper, the user opens the paper feed tray 46 as shown and places paper on it.

  The sheet feed cassette 40A (40B) includes a sheet storage unit 41 that stores a sheet bundle formed by stacking a plurality of sheets, and a lift plate 42 that lifts the sheet bundle for sheet feeding. A pickup roller 43 and a roller pair of a paper feed roller 44 and a retard roller 45 are arranged on the upper right side of the paper feed cassette 40A (40B). By driving the pickup roller 43 and the paper feed roller 44, the uppermost sheet of the paper bundle in the paper feed cassette 40 </ b> A is fed out one by one and carried into the upstream end of the transport path 50. On the other hand, the paper placed on the paper feed tray 46 is similarly carried into the transport path 50 by driving the pickup roller 461 and the paper feed roller 462.

  The conveyance path 50 includes a main conveyance path 50A that conveys a sheet from the sheet feeding unit 40 to the exit of the fixing unit 36 through the image forming unit 31, and a sheet that is printed on one side when performing duplex printing on the sheet. A reverse conveyance path 50B for returning to the image forming unit 31, a switchback conveyance path 50C for directing paper from the downstream end of the main conveyance path 50A to the upstream end of the reverse conveyance path 50B, and the downstream end of the main conveyance path 50A To a sheet discharge port 10E provided on the left side surface 10L of the apparatus main body 10 and a horizontal conveyance path 50D for conveying the sheet in the horizontal direction.

  A registration roller pair 51 is disposed on the upstream side of the main transfer path 50A from the secondary transfer portion 35A. The sheet is temporarily stopped by the registration roller pair 51, and after skew correction is performed, the sheet is sent to the secondary transfer unit 35A at a predetermined timing for image transfer. In addition, a plurality of transport rollers 52 for transporting paper are arranged in the main transport path 50A. The same applies to the other transport paths 50B, 50C and 50D.

  The most downstream side of the horizontal conveyance path 50D is branched into a first discharge path 70a and a second discharge path 70b. A switching lever 71 is disposed at the branch point of the first discharge path 70a and the second discharge path 70b, and the discharge destination of the sheet that has flowed through the horizontal conveyance path 50D is determined by the direction of the switching lever 71. As shown in FIG. 1, when the switching lever 71 is in the solid line position, the sheet is sent to the second discharge path 70b, and when the switching lever 71 is in the dotted line position, the sheet is sent to the first discharge path 70a. The switching lever 71 is moved by a drive unit (not shown), and the drive unit is driven and controlled by a control unit (not shown) that controls operation of the entire image forming apparatus 1.

  The paper discharged from the paper discharge port 10E of the first discharge path 70a is sent to the post-processing device 9 disposed on the left side surface 10L of the apparatus main body 10. In the image forming apparatus to which the post-processing device 9 is not attached, a paper discharge tray is provided below the paper discharge port 10E.

  The post-processing device 9 is an optional unit that is added later to the apparatus main body 10, and is a device that performs post-processing such as punching processing and stapling processing on the paper after image formation, and discharges the paper. The post-processing device 9 includes a receiving port 901 that receives a paper sheet at the paper discharge port 10 </ b> E, a main body unit 91 that includes a mechanism unit for post-processing, and a discharge tray 92 that discharges the processed paper.

  A paper discharge roller 82 is disposed at the paper discharge port 10F of the second discharge path 70b, and the paper discharge roller 82 feeds paper to a paper discharge tray 73 installed below the paper discharge port 10F of the apparatus body 10. Discharge. When post-processing such as punching processing or stapling processing is not performed, the control unit of the image forming apparatus 1 guides the sheet to the second discharge path 70 b with the switching lever 71 in the position of the solid line, and discharges the paper to the discharge tray 73. On the other hand, when post-processing is performed, the control unit sets the switching lever 71 to the position of the dotted line, guides the paper to the first discharge path 70a, and sends the paper to the post-processing device 9.

  If a jam occurs in the post-processing apparatus 9 during continuous paper processing (for example, 10 copies), the control unit moves the switching lever 71 from the dotted line position to the solid line position at that time. Switch to. As a result, the sheet being conveyed in the apparatus main body 10 is guided to the second discharge path 70 b and discharged from the discharge tray 73. Even when the post-processing device 9 does not operate due to a failure or the like, the device main body 10 does not stop, and the control unit sets the switching lever 71 to the position of the solid line. As a result, the sheet is surely discharged to the discharge tray 73 without being erroneously sent to the failed post-processing device 9.

  Further, a cover 74 is attached to the upper surface 10T of the apparatus main body 10 and above the second discharge path 70b. The cover 74 can be opened and closed upward, and the posture can be changed between an open posture and a closed posture. In FIG. 1, the cover 74 is in a closed position.

  The second discharge path 70b will be described in detail. FIG. 2 is a cross-sectional view showing the structure of the second discharge path 70b. The arrow Y1 in the figure is a path when the paper is sent to the second discharge path 70b, and the arrow Y2 is a path when the paper is sent to the first discharge path 70a. Rollers 81a and 82a that are driving rollers and rollers 81b and 82b that are driven rollers are disposed in the second discharge path 70b. These rollers are transport rollers that transport the paper fed into the first discharge path 70 toward the paper discharge port 10F. The rollers 81a and 82a are rotationally driven by a motor (not shown), and the rollers 81b and 82b are driven according to the rotation of these rollers. The discharge roller 82 shown in FIG. 1 includes a roller 82a and a roller 82b.

  The guide member 80 forms an upper surface wall of the second discharge path 70b, and at the same time, forms a frame 84 that covers the rollers 81b and 82b. The rotation shafts of the rollers 82b and 81b are fixed to a guide member 80, and the guide member 80 is a rotation shaft (in a direction orthogonal to the paper conveyance direction located upstream (downward) in the paper conveyance direction from the roller 81b). (Not shown) and fixed to the apparatus main body 10 side.

  Conventionally, when a jam occurs in the second discharge path 70b, the user takes out the jammed paper by opening the side cover on the left side surface 10L of the apparatus main body 10 (the surface on the side where the post-processing device 9 is installed). . That is, after the connection between the apparatus main body 10 and the post-processing apparatus 9 is released and the post-processing apparatus 9 is moved, an operation of opening the side cover and taking out the paper is necessary, and the jam processing performance is poor.

  Therefore, in the present embodiment, a cover 74 capable of opening the second discharge path 70b to the outside is provided on the upper surface of the apparatus main body 10 so that the paper jammed in the second discharge path 70b can be easily taken out. FIG. 3 is a cross-sectional view of the second discharge path 70b when the cover 74 is in the open posture. Similarly, FIG. 4 is a perspective view when the cover 74 is in the open posture. The cover 74 is attached to the upper part of the second discharge path 70b on the left side of the upper surface 10T of the apparatus main body 10 so as to be openable and closable upward with the open / close shaft 741 as an axis. Moreover, it is desirable that the opening when the cover 74 is opened has a size that allows the entire upper portion of the guide member 80 to be opened to the outside.

  After the cover 74 is opened, as shown in FIG. 3, when the user moves the guide member 80 in the direction of the arrow Y4 (the direction of the arrow Y5 shown in FIG. 4), it is on the upstream side in the paper conveyance direction from the roller 81b. The guide member 80 rotates about the rotation axis. Then, the roller 81a and the roller 81b are separated from each other, and the roller 82a and the roller 82b are also separated from each other. FIG. 5 is a cross-sectional view when the guide member 80 is moved in the arrow Y4 direction. As shown in FIG. 5, when the user rotates the guide member 80 about the rotation axis, the second discharge path 70b can be opened to the outside.

  There is a space 83 between the guide member 80 and the reading unit 25, and the guide member 80 can move within the space 83 within an allowable range. The space 83 has a volume sufficient to secure a space for the user to insert a finger into the second discharge path 70b when the guide member 80 moves in the space 83 and the second discharge path 70b is opened. Have. Therefore, when a jam occurs in the second discharge path 70b, the user opens the cover 74 and moves the guide member 80 to remove the paper causing the jam while opening the second discharge path 70b. Can do.

  The guide member 80 is biased by a spring (not shown) or the like so that the roller 82a and the roller 82b are always in a position (closed position) where the rollers 82a and 82b are in contact with each other. Therefore, when the user removes the finger from the second discharge path 70b, the guide member is returned toward the closed position by the bias of the spring.

  Further, the corner facing the cover 74 on the lower surface of the automatic document feeder 20 is chamfered. FIG. 6 is a perspective view showing the chamfered portion 29 in an easily understandable manner. By providing the chamfered portion 29, the leading edge of the cover 74 does not interfere with the corner portion of the automatic document feeder 20 even when the automatic document feeder 20 is closed. Accordingly, the cover 74 can be opened and closed regardless of the opening and closing of the automatic document feeder 20, and a wide opening can be secured when the cover 74 is opened, and fingers are put into the first conveyance path 70a from the opening. It can be made easier.

  As described above, the cover 74 is provided on the upper surface of the apparatus main body 10 and on the upper side of the second discharge path 70b, and the guide member 80 is centered on the rotating shaft provided on the upstream side in the paper transport direction from the roller 81b. When the guide member 80 is rotated, the second discharge path 70b can be opened to the outside because the rollers 81a and 81b and the rollers 82a and 82b are separated when the guide member 80 is rotated. Therefore, when a jam occurs in the second discharge path 70b, the user opens the cover 74, moves the roller 82b side of the guide member 80 to open the second discharge path 70b, and stays in the second discharge path 70b. It is possible to remove the existing paper and easily perform jam processing.

  Further, the corner of the lower surface of the automatic document feeder 20 facing the cover 74 is chamfered so that the cover 74 can be opened and closed regardless of the opening and closing of the automatic document feeder 20 and the cover 74 is opened. It is possible to secure a wide opening, and to easily put fingers into the first transport path 70a.

1 Image forming apparatus 10 Main body 10E Paper discharge port (first paper discharge port)
10F Paper outlet (second paper outlet)
20 Automatic document feeder (second device body)
29 Chamfer 30 Image Forming Unit (Image Forming Unit)
70a First discharge path (main transport path)
70b Second discharge path (sub-transport path)
71 Switching lever 73 Discharge tray 74 Cover 741 Open / close axis (open / close fulcrum)
80 Guide members 81a, 81b, 82a, 82b Roller 83 Space 84 Frame 9 Post-processing device

Claims (4)

An apparatus body having a housing structure including an upper surface and side surfaces;
Image forming means housed in the apparatus main body and forming an image on paper;
A first paper discharge port provided on one side surface of the apparatus main body;
A second paper discharge port provided on the one side surface above the first paper discharge port and in the vicinity of the upper surface;
A main conveyance path for conveying a sheet from the image forming unit toward the first sheet discharge port;
A sub-transport path that branches from the main transport path and transports the paper to the second paper discharge port while facing upward from the bottom ;
Wherein in the conveyance direction upstream side of the sub-passage has a pivot point extending in a direction perpendicular to the paper transport direction, the upper wall of the sub-passage is formed and the pivots on the pivoting fulcrum A guide member capable of opening the sub-transport path by being separated from the sub-transport path ;
A space that is formed inside the device main body and has an opening formed on the upper surface of the device main body above, the guide member being rotatably arranged;
The upper surface of the apparatus main body is provided at a portion facing the guide member so as to be openable and closable , and closes the opening, and the upper portion of the guide member is opened to the outside of the apparatus main body through the opening. A cover whose posture can be changed between an open posture and
A biasing member that biases the guide member in a direction in which the sub-transport path is closed;
With
In the open position of the cover, when the guide member is rotated around the rotation fulcrum against the urging force of the urging member in the space portion, the sub-transport path passes through the opening. externally opened is Ru image forming apparatus of the apparatus main body. The cover has an open / close fulcrum disposed on the downstream side in the sheet conveyance direction of the sub conveyance path as viewed from the guide member and above the second sheet discharge port, and the second discharge port the device constitutes a part of said one side surface of the main body, an image forming apparatus according to claim 1 in which the said open position by rotating upward the opening and closing fulcrum above the. Further comprising a second device body which can be opened and closed with respect to the placed the upper surface on the upper surface of the apparatus main body, the second device body are those having a chamfered portion at the corner facing the cover in its lower surface wherein Item 3. The image forming apparatus according to Item 2 . A first transport roller pair disposed upstream of the sub transport path in the paper transport direction and transporting the paper;
A second transport roller pair disposed downstream of the sub transport path in the paper transport direction and transporting the paper;
The first transport roller pair is disposed to be opposed to the first drive roller that is rotationally driven and the first drive roller across the sub-transport path, and rotates in accordance with the first drive roller. A driven roller,
The second transport roller pair is disposed opposite to the second drive roller that is rotationally driven and the second drive roller across the sub-transport path, and rotates in accordance with the second drive roller. A driven roller,
The first driven roller and the second driven roller are rotatably supported by the guide member,
When the guide member rotates about the rotation fulcrum and is separated from the sub-transport path, the first driven roller and the second driven roller are separated from the first drive roller and the second drive roller,
4. The image forming apparatus according to claim 1, wherein the guide member has a shape that covers an upper portion of the first driven roller and the second driven roller in the open posture of the cover. 5.

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