JP6415042B2 - Image forming apparatus - Google Patents

Description

The present invention relates to an image forming apparatus including a postprocessing means for performing processing after a predetermined the sheet over and.

  2. Description of the Related Art Conventionally, an image forming apparatus including a sheet processing apparatus that aligns a plurality of sheets on which images are formed and selectively performs post-processing such as binding processing or punching processing on the sheets is known. For example, the sheet processing apparatus stacks and aligns sheets on which images are formed on a processing tray, performs a binding process on the sheets to form a sheet bundle, and then presses the rear end of the sheet bundle with a bundle discharge member. Discharge onto the loading tray. The stacking tray has an inclined stacking surface (around 30 °), and the sheet bundle discharged onto the stacking surface is returned to the opposite direction to the discharging direction so as to be aligned with the transport direction by hitting the stacking wall. (See Patent Document 1).

  Some sheet processing apparatuses are disposed between the image forming apparatus main body and the image reading apparatus. For example, a post-processed sheet bundle is transferred between the image forming apparatus main body and the image reading apparatus. A sheet processing apparatus that discharges to a space is known. However, when the post-processed sheet bundle is discharged into the space between the image forming apparatus main body and the image reading apparatus, if the inclination angle of the stacking tray is increased, the number of sheets that can be stacked on the stacking tray decreases, and the productivity increases. There is a problem of lowering.

  For this, the sheet bundle post-processed in the processing tray is gripped by the gripper, and loaded on the stacking tray while being gripped by the gripper, so that the stacking amount can be secured without increasing the inclination angle. An image forming apparatus has been proposed (see Patent Document 2).

JP 2013-71789 A JP 2011-79669 A

  However, when the gripper finishes the discharge operation, it is necessary to return to the home position for discharging the next sheet bundle, which has been a factor of reducing productivity.

The present invention aims at providing a suitably loadable images forming device post-treated sheet.

The present invention relates to an image forming apparatus main body for forming an image on a sheet, an image reading apparatus provided above the image forming apparatus main body and capable of reading image information of a document, and the image forming apparatus main body. Between the image forming apparatus main body and the image reading apparatus, and a post-processing unit that is provided between the image forming apparatus main body and the image reading apparatus. A discharge sheet stacking unit that is positioned above the post-processing unit in a space and stacks a sheet on which an image is formed by the image forming apparatus main body and is not post-processed by the post-processing unit. A discharge sheet stacking section that can be stacked independently; and a post-processing sheet stacking section that can stack sheets that have been post-processed by the post-processing means and discharged in the discharge direction. The stacking unit includes a first stacking unit located in the space, and a second stacking unit that is retractably stored below the stacking surface of the first stacking unit, and the second stacking unit is the first stacking unit. A sheet having a second size smaller than the first size in the discharge direction can be stacked on the first stacker while being stored in the first stacker, and the second stacker is the first stacker. in a state of being drawn outwardly from the space to the discharge direction downstream from a possible stacking the first sheet size in the first stacking portion and the second stacking portion, wherein the first stacking unit, upstream A loading surface and a downstream loading surface that is located downstream of the upstream loading surface in the discharge direction and has a smaller inclination than the upstream loading surface, and the boundary between the upstream loading surface and the downstream loading surface is A4 size that can be loaded on the first loading section without pulling out the second loading section. Of the center of gravity of the sheet is in the discharge direction downstream, the first inclination of the stacking surface of the second stacking portion in a state of being pulled out from the loading section is greater than the inclination of the stacking surface of the first stacking unit The inclination of the loading surface of the second loading unit in the state of being accommodated in the first loading unit is more than the inclination of the loading surface of the second loading unit in the state of being pulled out from the first loading unit. The discharge direction downstream end of the first stacking unit is smaller than the downstream end of the discharge sheet stacking unit in the discharge direction.

According to the present invention, it is possible to provide a suitably loadable images forming device post-treated sheet.

1 is a cross-sectional view schematically showing a printer according to an embodiment of the present invention. It is a control block diagram of a controller of the printer according to the present embodiment. It is a control block diagram of the finisher control part which concerns on this embodiment. It is sectional drawing for demonstrating the finisher which concerns on this embodiment. It is sectional drawing for demonstrating the finisher which concerns on this embodiment. It is sectional drawing for demonstrating the finisher which concerns on this embodiment. It is a flowchart of the binding process job according to the present embodiment. It is sectional drawing which shows the stacking tray of the state which pulled out the extension tray. FIG. 5 is a cross-sectional view illustrating a curled sheet bundle stacked on a stacking tray.

  An image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. The image forming apparatus according to the present embodiment is an image forming apparatus provided with post-processing means such as a copying machine, a printer, a facsimile machine, and a multi-function machine. In the following embodiments, an electrophotographic laser beam printer (hereinafter referred to as “printer”) 900 will be described.

  First, a schematic configuration of the printer 900 will be described with reference to FIG. FIG. 1 is a cross-sectional view schematically showing a printer 900 according to an embodiment of the present invention.

  As shown in FIG. 1, a printer 900 includes an image forming apparatus main body (hereinafter referred to as “printer main body”) 900A that forms an image on a sheet P, an image reading apparatus 950 that can read image information of a document, and a sheet P. And a finisher 100 that performs predetermined post-processing. In the present embodiment, the image reading device 950 includes a document feeding device 950A capable of automatically feeding a document, and the finisher 100 is disposed between the printer main body 900A and the image reading device 950. .

  The printer main body 900A includes photosensitive drums a to d that form toner images of yellow, magenta, cyan, and black, and an intermediate transfer belt 902 that carries the toner images formed on the photosensitive drums a to d. Yes. The photosensitive drums a to d are configured to be rotationally driven by a motor (not shown), and a primary charger, a developing device, and a transfer charger (not shown) are arranged around the photosensitive drums a to d, respectively. . Each photosensitive drum, the primary charger, the developer, and the transfer charger are unitized as process cartridges 901a to 901d, and are configured to be detachable from the printer main body 900A. An exposure device 906 composed of a polygon mirror or the like is disposed below the photosensitive drums a to d.

  For example, when an image of a document is read by the image reading device 950, first, laser light for the yellow component of the document is projected onto the photosensitive drum a via the polygon mirror of the exposure device 906 and the like. An electrostatic latent image is formed. By supplying yellow toner to the developing device, the electrostatic latent image is visualized as a yellow toner image. When the yellow toner image arrives at the primary transfer portion where the photosensitive drum a and the intermediate transfer belt 902 come into contact with the rotation of the photosensitive drum a, the yellow toner image is formed by the primary transfer bias applied to the transfer charging member 902a. The image is transferred to the intermediate transfer belt 902.

  When the intermediate transfer belt 902 rotates, the magenta toner image formed on the photosensitive drum b by the same method as described above is transferred onto the intermediate transfer belt 902 from above the yellow toner image. Similarly, as the intermediate transfer belt 902 rotates, a cyan toner image formed on the photosensitive drum c and a black toner image formed on the photosensitive drum d are superimposed and transferred, and four color toners are transferred onto the intermediate transfer belt 902. The image is transferred.

  On the other hand, sheets P on which images are formed are stored in a cassette 904 provided below the printer main body 900 </ b> A, and are fed one by one from the cassette 904 by a pickup roller 908. The fed sheet P is timed by the registration roller 909, reaches the secondary transfer unit 903, and the four color toners on the intermediate transfer belt 902 by the secondary transfer bias applied to the secondary transfer roller 903a. The image is transferred onto the sheet P at once.

  The sheet P on which the four color toner images have been transferred is guided by a conveyance guide 920 and conveyed to a pair of fixing rollers 905. When the fixing roller pair 905 receives heat and pressure, the toner is melted and mixed to produce a full-color print image. As established. The sheet P on which the image has been fixed is conveyed to the finisher 100 by the first discharge roller pair 925 through the conveyance guide 921 by the switching member 923 or stacked on the discharge sheet by the second discharge roller 924 through the conveyance path 922. The unit 120 is loaded.

  The discharged sheet stacking unit 120 is disposed above the finisher 100, and a part thereof is positioned above a stacking tray (bundle stacking unit, first stacking unit) 114 described later. In other words, the sheet discharge direction downstream end B of the discharge sheet stacking unit 120 is located upstream of the bundle discharge direction downstream end A of the stacking tray 114 as the first stacking unit, and the large size (described later) For example, A3) sheets are also formed to a length that can be stacked.

  The finisher 100 sequentially takes in the sheets P discharged from the printer main body 900A, aligns the plurality of taken-in sheets P into a sheet bundle PA, and an upstream end (hereinafter referred to as a rear end) of the bundled sheet bundle PA in the bundle conveyance direction. A binding process (post-processing) is performed. The sheet bundle PA that has been post-processed by the finisher 100 is discharged out of the apparatus and stacked on the stacking tray 114. The finisher 100 will be described in detail later.

  Next, the configuration of the controller that controls the printer 900 will be described with reference to FIGS. FIG. 2 is a control block diagram of the controller of the printer 900 according to the present embodiment. FIG. 3 is a control block diagram of the finisher control unit 220 according to the present embodiment.

  As shown in FIG. 2, the controller includes a CPU circuit unit 200, and the CPU circuit unit 200 includes a CPU 201, a ROM 202, and a RAM 203. A control program or the like is stored in the ROM 202, and the RAM 203 is used as an area for temporarily holding control data or a work area for computations associated with control.

  The CPU circuit unit 200 comprehensively controls the DF control unit 204, the image reader control unit 205, the image signal control unit 206, the printer control unit 207, and the finisher control unit 220 based on a control program stored in the ROM 202. The DF (document feeding) control unit 204 controls driving of the document feeding device 950 </ b> A based on a command from the CPU circuit unit 200. The image reader control unit 205 drives and controls the scanner unit, the image unit, and the like of the image reading device 950 based on a command from the CPU circuit unit 200 and transfers an analog image signal output from the image sensor to the image signal control unit 206. To do.

  The image signal control unit 206 converts the analog image signal output from the image sensor into a digital signal, converts the digital signal into a video signal, and outputs the video signal to the printer control unit 207. Further, when a digital image signal is input from the computer 208 via the external I / F 209, the image signal control unit 206 converts the input digital image signal into a video signal and outputs the video signal to the printer control unit 207. . The processing operation by the image signal control unit 206 is controlled by the CPU circuit unit 200. The printer control unit 207 drives and controls the printer main body 900A (the above-described exposure apparatus and the like) based on the input video signal.

  The operation unit 210 includes a plurality of keys for setting various functions relating to image formation, a display unit for indicating a setting state, and the like. The operation unit 210 outputs a key signal corresponding to the operation of each key to the CPU circuit unit 200, and the CPU circuit. Information corresponding to the signal from the unit 200 is displayed on the display unit. The finisher control unit 220 is mounted on the finisher and performs drive control of the entire finisher 100 by exchanging information with the CPU circuit unit 200.

  As shown in FIG. 3, the finisher control unit 220 includes a CPU 221, a ROM 222 that stores control programs and the like, and a RAM 223 that is used as an area for temporarily storing control data and a work area for operations associated with control. It is equipped with. The finisher control unit 220 communicates with the CPU circuit unit 200 via the communication IC 224 to exchange data, executes various programs stored in the ROM 222 based on instructions from the CPU circuit unit 200, and drives the finisher 100. Take control.

  For example, the finisher control unit 220 drives and controls various motors of the finisher 100 via the driver 225 based on signals input from various sensors of the finisher 100. The various sensors include an inlet sensor S240, a tray HP sensor S241, a tray lower limit sensor S242, a paddle HP sensor S243, an assist HP sensor S244, a bundle presser HP sensor S245, and a discharge sensor S246. The various motors include a transport motor M250, a tray lifting / lowering motor M251, a paddle lifting / lowering motor M252, an alignment motor M253, an assist motor M254, a bundle pressing motor M255, and an STP motor M256.

  Next, the finisher 100 described above will be described with reference to FIGS. First, a schematic configuration of the finisher 100 will be described along the flowchart of FIG. 7 with reference to FIGS. In the present embodiment, the finisher 100 that performs the binding process on the sheet bundle PA will be described. However, a finisher that performs post-processing such as a punching process or a stapleless binding may be used. 4 to 6 are cross-sectional views for explaining the finisher 100 according to the present embodiment. FIG. 7 is a flowchart of the binding processing job according to the present embodiment.

  As shown in FIG. 4A, the sheet P discharged from the printer main body 900A is transferred to the entrance roller 101 driven by the transport motor M250, and is transported to the transport path by the entrance roller 101. At this time, the delivery of the sheet P to the entrance roller 101 is detected by the entrance sensor S240. Thereafter, the sheet P moving on the conveyance path is delivered to the discharge roller 103, conveyed by the discharge roller 103 while lifting the trailing edge drop 105 at the leading edge, and discharged to the processing tray 107 while being discharged by the charge removal needle 104. (Step S10).

  At this time, discharge of the sheet P to the processing tray 107 is detected by a discharge sensor S246 provided upstream in the conveyance direction of the discharge roller 103, and the finisher control unit 220 uses a stapler (post-processing) to be described later based on this detection signal. Means) 110 and the like are controlled. The sheet P discharged to the processing tray 107 by the discharge roller 103 is pushed from the upper side by the trailing edge dropping 105, so that the time for dropping to the processing tray 107 is shortened.

  As shown in FIG. 4B, when the sheet P falls on the processing tray 107, the paddle 106 is lowered toward the processing tray 107 around the rotation axis by the paddle lifting motor M252. At this time, the paddle 106 is rotated counterclockwise by the conveyance motor M250, and the paddle 106 comes into contact with the sheet P, so that the sheet P is placed on the rear end stopper 108 positioned in the right direction in FIG. It is conveyed toward. When the rear end of the sheet P is transferred to the knurled belt (transfer member) 117, the paddle 106 is raised by the paddle lifting motor M252, and when the HP (home position) is detected by the paddle HP sensor, the paddle 106 is raised. Is stopped.

  The knurled belt 117 conveys the sheet P conveyed by the paddle 106 to the rear end stopper 108 that regulates the rear end of the sheet P, and then travels while slipping with respect to the sheet P. The rear end stopper 108 is biased. By the slip running of the knurled belt 117, the rear end of the sheet P is abutted against the rear end stopper 108, and the skew of the sheet P is corrected (step S11). The sheet P abutted against the trailing edge stopper 108 is aligned in a direction orthogonal to the sheet conveying direction (hereinafter referred to as the width direction) by a pair of alignment plates (a pair of alignment means) 109 driven by an alignment motor M253. (Step S12). By repeating this series of operations, a sheet bundle PA aligned on the processing tray 107 is formed as shown in FIG. 5A (step S13).

  After the sheet bundle PA is formed, when the binding process using the stapler needle is performed on the sheet bundle PA, the STP motor M256 that drives the stapler 110 is driven to bind the sheet bundle PA (steps S14 and S15). . As shown in FIG. 5B, the bound sheet bundle PA is pushed by the rear end assist 112 driven by the assist motor M254 and the discharge claw 113 of the sheet conveying device 501. The paper is discharged onto the stacking tray 114 (step S16).

  As shown in FIG. 6, in order to prevent the sheet bundle PA discharged to the stacking tray 114 from being pushed out in the conveying direction by the subsequent sheet bundle PA, the bundle presser motor M255 is driven to rotate the bundle presser 115 counterclockwise. The rear end portion is pressed by rotating around (step S17). Then, after completion of the trailing edge pressing of the sheet bundle PA, when the sheet bundle PA shields the tray HP sensor S241, the stack raising and lowering motor M251 lowers the stacking tray 114 until the tray HP sensor S241 is in the transmission state. To determine the page position.

  By performing the series of operations described above, the required number of sheet bundles PA can be discharged to the stacking tray 114 (step S18). In addition, during operation, when the stacking tray 114 is lowered and the tray lower limit sensor S242 is shielded (the stacking tray 114 is full), the finisher control unit 220 notifies the CPU circuit unit 200 of a full load signal, and image formation is performed. Canceled. After that, when the sheet bundle PA is removed, the stacking tray 114 rises until the tray HP sensor S241 shields the light, and then descends to allow the tray HP sensor S241 to pass therethrough, so that the position of the stacking tray 114 is determined again, and image formation is performed. Is resumed.

  Next, the stacking tray 114 described above will be described with reference to FIGS. FIG. 8 is a cross-sectional view showing the stacking tray 114 with the extension tray 116 pulled out. FIG. 9 is a cross-sectional view illustrating a state in which the curled sheet bundle PA is stacked on the stacking tray 114.

  The stacking tray 114 is located in a space between the printer main body and the image reading device, and the leading end of the half size (for example, A4, LTR size) sheet in the discharging direction is the downstream end A of the stacking tray 114 in the bundle discharging direction. It is formed in the length located inside. Further, as shown in FIG. 8, the stack tray 114 has a bundle discharge direction downstream end A that is substantially the same as a side surface position (extension line) C of the printer 900 so that the bundle discharge direction downstream end A does not protrude from the side surface of the printer 900. It is located at the same position (neighborhood). As a result, the half-size sheets P (or sheet bundles PA) stacked on the stacking tray 114 do not protrude from the side surface of the printer 900.

  Further, the stacking tray 114 includes an upstream stacking surface 114a on the upstream side in the bundle discharging direction and a downstream stacking surface 114b on the downstream side in the bundle discharging direction, and the inclination angle θ1 of the upstream stacking surface 114a is determined by the downstream stacking surface 114b. It is formed to be larger than the inclination angle (θ1> θ2). In addition, the boundary (inflection point) 114c between the upstream stacking surface 114a and the downstream stacking surface 114b is located downstream of the center of gravity of the largest half-size sheet (for example, LTR) that can be stacked on the stacking tray 114 in the bundle discharge direction. It is formed to do. By arranging in this way, the center of gravity of the sheet bundle PA of half size or less discharged from the processing tray 107 is on the upstream side in the bundle discharge direction from the inflection point, and the return performance of the sheet bundle PA to the stacking wall 121 is improved. Secured. Further, by setting the inclination angle θ2 of the downstream stacking surface 114b to be smaller than the inclination angle of the upstream stacking surface 114a (the downstream stacking surface 114b is laid down more than the upstream stacking surface 114a), a space in the height direction of the stacking tray 114 is secured. It becomes possible.

  The stacking tray 114 stores (stores) an extension tray (bundle stacking unit, second stacking unit) 116 therein, and the extension tray 116 as the second stacking unit stacks a large-size sheet bundle PA. Used when pulled out. That is, the upstream end of the extension tray 116 in the bundle discharging direction is substantially at the same position as the extension line on the side surface of the printer main body 900A. In other words, the inflection point with the stacking tray 114 is substantially the same as the extension line on the side surface of the printer main body 900A. Located in position. Further, when the extension tray 116 is pulled out, it is formed so that the inclination angle θ3 is larger than the inclination angle θ1 of the upstream stacking surface 114a (θ3> θ1), and is positioned in an area outside the printer 900. , Space in the height direction is also secured. By arranging the extension tray 116 in this way, the return performance of the large-size sheet bundle PA to the stacking wall 121 is improved.

  As described above, the printer 900 according to the present embodiment has the following effects. For example, the printer 900 is formed such that the inclination angle of the extension tray 116 extending outside the area of the printer 900 is larger than the inclination angle of the stacking tray 114 (θ3> θ1> θ2). Therefore, the return performance of the large-size sheet bundle PA to the stacking wall 121 can be improved without reducing the number of stackable sheets. Accordingly, a plurality of aligned sheet bundles can be stacked on the stacking tray 114 without reducing productivity.

  Further, the extension tray 116 is configured to be housed in the stacking tray 114 located in the area of the printer 900. Therefore, it can be pulled out only during use, and damage due to contact or the like can be prevented. Moreover, it is not necessary to always secure the installation position.

  Further, for example, when the sheet bundle is discharged to the stacking tray by the gripper, the gripper is released before the rear end of the sheet bundle is abutted against the stacking wall 121, so that the inertia (inertia) is applied after hitting the stacking wall 121. May disturb the loading condition. However, in the present embodiment, the sheets can be stacked with a simple configuration without disturbing the stacking state of the sheet bundle. In addition, the gripper needs to be moved to the home position in order to discharge the subsequent sheet, and the productivity may be reduced. However, in this embodiment, since the gripper is not used, the productivity is reduced. Can be prevented. Further, unnecessary operating noise is not generated unlike the gripper.

  Furthermore, the stacking tray 114 has an upstream stacking surface 114a and a downstream stacking surface 114b having an inclination angle smaller than that of the upstream stacking surface 114a, which is larger than the center of gravity of the largest half-size sheet on which an inflection point can be stacked. , Located on the downstream side in the bundle discharge direction. Therefore, the return performance of the sheet bundle discharged to the stacking tray 114 can be ensured.

  Further, since the inclination angle θ2 of the downstream stacking surface 114b is smaller than the inclination angle θ1 of the upstream stacking surface 114a, a space in the height direction of the stacking tray 114 can be secured on the downstream side in the bundle discharge direction. Therefore, it is possible to prevent the number of sheets that can be loaded from decreasing. For example, as shown in FIG. 9, even when the discharged sheet bundle is toy curled (a state where the upstream and downstream of the bundle discharge direction are curved), the space in the height direction D of the stacking tray 114 can be secured. it can.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above. In addition, the effects described in the embodiments of the present invention only list the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments of the present invention.

  For example, in this embodiment, the extension tray (second stacking tray) 116 has been described using a configuration in which the stacking tray (first stacking tray) 114 can be stored (extendable), but the present invention is not limited thereto. Not. The extension tray (second stacking tray) 116 may be fixed to the stacking tray (first stacking tray) 114, and the extension tray (second stacking tray) 116 may be removed from the stacking tray (first stacking tray) 114. The structure which can be attached or detached may be sufficient.

  Further, in this embodiment, the finisher 100 is controlled by the CPU 221 of the finisher control unit 220 mounted on the finisher 100. However, the finisher 100 may be directly controlled by the CPU of the CPU circuit unit 200 provided in the printer 900. Good. Further, it may be a CPU in an information device such as a separate personal computer, and the CPU that performs the control processing of the finisher 100 is not necessarily provided in the finisher 100 itself. When the CPU is provided in a separate information device or the like, signals are transmitted and received via a communication line or the like (whether wired or wireless), and various control processes are performed. In addition, this aspect is the same not only for the CPU described above but also for other RAMs and ROMs.

  In this embodiment, the electrophotographic printer has been described. However, the present invention is not limited to this. For example, the present invention can also be used for an ink jet printer (image forming apparatus) that forms an image on a sheet by ejecting ink liquid from a nozzle.

107 processing tray 114 stacking tray (bundle stacking unit, first stacking unit)
116 Extension tray (bundle stacking section, second stacking section)
120 Discharged sheet stacking unit 900 Printer (image forming apparatus)
900A Printer body (image forming apparatus body)
950 Image reader P sheet PA sheet bundle

Claims (5)

An image forming apparatus main body for forming an image on a sheet;
An image reading apparatus provided above the image forming apparatus main body and capable of reading image information of a document;
A post-processing unit that is provided between the image forming apparatus main body and the image reading apparatus and performs a predetermined post-processing on a sheet on which an image is formed by the image forming apparatus main body;
A sheet positioned between the image forming apparatus main body and the image reading apparatus and above the post-processing unit is stacked with an image formed by the image forming apparatus main body and not post-processed by the post-processing unit. A discharge sheet stacking unit capable of stacking a first size sheet independently;
A post-processing sheet stacking unit capable of stacking sheets post-processed by the post-processing means and discharged in the discharge direction;
The post-processing sheet stacking unit includes a first stacking unit located in the space, and a second stacking unit that is retractably stored below a stacking surface of the first stacking unit. A sheet having a second size smaller than the first size in the discharge direction can be stacked on the first stacking unit with the second stacking unit being stored in the first stacking unit. The first size sheets can be stacked on the first stacking unit and the second stacking unit in a state of being pulled out of the space downstream from the first stacking unit in the discharge direction,
The first loading unit has an upstream loading surface, and a downstream loading surface that is located downstream of the upstream loading surface in the discharge direction and has a smaller inclination than the upstream loading surface,
The boundary between the upstream stacking surface and the downstream stacking surface is downstream in the discharge direction from the center of gravity of the A4 size sheet that can be stacked on the first stacking unit without pulling out the second stacking unit,
The inclination of the loading surface of the second loading unit in the state pulled out from the first loading unit is larger than the inclination of the loading surface of the first loading unit and is stored in the first loading unit. The inclination of the loading surface of the second loading unit is smaller than the inclination of the loading surface of the second loading unit when the loading surface is pulled out from the first loading unit,
The image forming apparatus according to claim 1, wherein the downstream end of the first stacking unit in the discharge direction is located downstream of the downstream end of the discharge sheet stacking unit in the discharge direction. In a state where the second stacking unit is stored in the first stacking unit, a downstream end of the second stacking unit in the discharge direction is located in the space.
The image forming apparatus according to claim 1. The first size is A3 size, and the second size is A4 size.
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. A downstream end of the discharge sheet stacking portion in the discharge direction is located downstream from an upstream end of the first stacking portion in the discharge direction;
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The upstream loading surface has a smaller inclination than the loading surface of the second loading unit;
The image forming apparatus according to claim 1 , wherein the image forming apparatus is an image forming apparatus.

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