Patent Publication Number: US-2022214642-A1

Title: Image forming apparatus and toner cartridge

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of and claims priority under 35 U.S.C. § 120 to U.S. patent application Ser. No. 16/421,445 filed May 23, 2019, the entire disclosure of which is hereby incorporated by reference, which in turn is based upon and claims the benefit of priority under 35 U.S.C. § 119 to prior Japanese patent application No. 2018-099444, filed on May 24, 2018, the entire contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an image forming apparatus and a toner cartridge. 
     BACKGROUND 
     In the related art, an image forming apparatus includes an apparatus main body, a drawer movable between an inner position located inside the apparatus main body and an outer position located outside the apparatus main body, a cartridge capable of being mounted to the drawer, an exposure device, and a fixing device. The cartridge includes a photosensitive drum, a cleaning member configured to remove waste toner from the photosensitive drum, and a developing unit including a developing roller and configured to accommodate therein toner. In a state where the cartridge is mounted to the drawer and the drawer is located at the inner position, the cleaning member is located between the photosensitive drum and the fixing device. 
     In the image forming apparatus described in related art, the cartridge integrally includes the photosensitive drum and the developing unit. 
     For this reason, for example, when a remaining amount of toner in the developing unit is reduced, the entire cartridge including the photosensitive drum needs to be replaced even when it is not necessary to replace the photosensitive drum. As a result, it is difficult to save cost. 
     SUMMARY 
     Aspect of non-limiting embodiments of the present disclosure relates to provide an image forming apparatus in which a cleaning member is located between a photosensitive drum and a fixing device in a state where a drum cartridge is mounted to a drawer and the drawer is located at an inner position and a drum cartridge and a toner cartridge can be individually replaced. 
     Aspects of certain non-limiting embodiments of the present disclosure address the features discussed above and/or other features not described above. However, aspects of the non-limiting embodiments are not required to address the above features, and aspects of the non-limiting embodiments of the present disclosure may not address features described above. 
     According to an aspect of the present disclosure, there is provided an image forming apparatus including: an apparatus main body; a drawer moveable between an inner position located inside the apparatus main body and an outer position located outside the apparatus main body; a drum cartridge including: a photosensitive drum; a cleaning member configured to remove waste toner from the photosensitive drum; a developing device including a developing roller configured to form a toner image by developing a latent image formed on the photosensitive drum by toner and being movable relative to the photosensitive drum; a waste toner conveying pipe configured to convey the waste toner removed from the photosensitive drum by the cleaning member; and a frame supporting the photosensitive drum, the cleaning member and the developing device; an exposure device configured to expose the photosensitive drum to form a latent image on a peripheral surface of the photosensitive drum; a fixing device configured to fix the toner image transferred from the photosensitive drum to a printing medium and being spaced upward from the photosensitive drum in a state where the drum cartridge is mounted to the drawer and the drawer is located at the inner position; and a toner cartridge including: a toner container capable of accommodating therein the toner to be supplied to the developing roller; and a waste toner container capable of accommodating therein the waste toner, wherein the cleaning member is located between the photosensitive drum and the fixing device in a vertical direction in the state where the drum cartridge is mounted to the drawer and the drawer is located at the inner position, wherein the drum cartridge is capable of being mounted to the drawer, and wherein the toner cartridge is attachable to and detachable from the drum cartridge. 
     According to another aspect of the present disclosure, there is provided a toner cartridge including: a toner container capable of accommodating therein toner and having a toner discharge port through which the toner is to be discharged, the toner container including: a shutter configured to be movable between a closing position at which the shutter closes the toner discharge port and an opening position at which the shutter opens the toner discharge port; and a lever configured to move the shutter and movable between a first position at which the shutter is located at the closing position and a second position at which the shutter is located at the opening position; and a waste toner container capable of accommodating therein waste toner and moveably coupled to the toner container, wherein when the lever is located at the first position, the lever is engaged with the waste toner container, so that the waste toner container is immovable relative to the toner container, and wherein when the lever is located at the second position, engagement between the lever and the waste toner container is released, so that the waste toner container is movable relative to the toner container. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic configuration view of an image forming apparatus; 
         FIG. 2  depicts a state where a drawer shown in  FIG. 1  is located at an outer position; 
         FIG. 3  is a plan view of a drum cartridge shown in  FIG. 1 ; 
         FIG. 4  is a sectional view taken along a line A-A of the drum cartridge shown in  FIG. 3 ; 
         FIG. 5  is a plan view of a toner cartridge shown in  FIG. 1 ; 
         FIG. 6A  is a side view of the toner cartridge shown in  FIG. 5 ,  FIG. 6B  is a sectional view taken along a line B-B of the toner cartridge shown in  FIG. 5 , and  FIG. 6C  is a sectional view taken along a line C-C of the toner cartridge shown in  FIG. 5 ; 
         FIG. 7  illustrates attaching of the toner cartridge to the drum cartridge, depicting a state where the toner cartridge is attached to the drum cartridge and a lever is located at a first position; 
         FIG. 8  illustrates attaching of the toner cartridge to the drum cartridge together with  FIG. 7 , depicting a state where the toner cartridge is attached to the drum cartridge and the lever is located at a second position; 
         FIG. 9  illustrates a second exemplary embodiment, depicting a state where the toner cartridge is attached to the drum cartridge; 
         FIG. 10  illustrates a first shutter shown in  FIG. 9 , depicting a state where the first shutter is located at a closing position; 
         FIG. 11A  is a side view of the toner cartridge shown in  FIG. 9 , depicting a state where the lever is located at the first position, and  FIG. 11B  is a side view of the toner cartridge shown in  FIG. 9 , depicting a state where the lever is located at the second position; 
         FIG. 12  illustrates a third exemplary embodiment, depicting a state where the toner cartridge is attached to the drum cartridge; 
         FIG. 13A  is a side view of the toner cartridge shown in  FIG. 12 , depicting a state where the lever is located at the first position, and  FIG. 13B  is a side view of the toner cartridge shown in  FIG. 12 , depicting a state where the lever is located at the second position; 
         FIG. 14  illustrates attaching of the toner cartridge to the drum cartridge, depicting a state where the toner cartridge is connected to a waste toner conveying pipe and the waste toner conveying pipe is located at a demounting position; and 
         FIG. 15  illustrates attaching of the toner cartridge to the drum cartridge together with  FIG. 14 , depicting a state where a waste toner container is guided by a first guide and a third guide and the toner container is guided by a second guide. 
     
    
    
     DETAILED DESCRIPTION 
     1. Outline of Image Forming Apparatus of First Exemplary Embodiment 
     Referring to  FIGS. 1 and 2 , an outline of an image forming apparatus  1  of a first exemplary embodiment is described. 
     As shown in  FIG. 1 , the image forming apparatus  1  includes an apparatus main body  2 , a feeder unit  3 , a drawer  4 , a drum cartridge  5 , an exposure device  6 , a toner cartridge  7 , a transfer roller  8 , and a fixing device  9 . 
     1.1 Apparatus Main Body 
     The apparatus main body  2  is configured to accommodate therein the feeder unit  3 , the drawer  4 , the drum cartridge  5 , the exposure device  6 , the toner cartridge  7 , the transfer roller  8 , and the fixing device  9 . The apparatus main body  2  has an opening  2 A and a cover  2 B. 
     The opening  2 A is located at an opposite side to the transfer roller  8  with respect to the drum cartridge  5  in a state where the drum cartridge  5  is mounted to the apparatus main body  2 . 
     The cover  2 B is configured to be movable between a closing position (see  FIG. 1 ) at which the opening  2 A is closed and an opening position (see  FIG. 2 ) at which the opening  2 A is opened. 
     1.2 Feeder Unit 
     The feeder unit  3  is configured to feed a printing medium P to a photosensitive drum  13 . The printing medium P is, for example, a printing sheet. The photosensitive drum  13  will be described later. The feeder unit  3  includes a sheet feeding tray  10 , a pickup roller  11 , and a sheet feeding roller  12 . The sheet feeding tray  10  is configured to accommodate therein the printing medium P. The pickup roller  11  is configured to convey the printing medium P in the sheet feeding tray  10  toward the sheet feeding roller  12 . The sheet feeding roller  12  is configured to covey the printing medium P sent from the pickup roller  11  toward the photosensitive drum  13 . 
     1.3 Drawer 
     The drawer  4  is configured to be movable between an inner position (see  FIG. 1 ) and an outer position (see  FIG. 2 ) in a state where the cover  2 B is located at the opening position. When the drawer  4  is located at the inner position, the drawer  4  is located inside the apparatus main body  2 . When the drawer  4  is located at the outer position, the drawer  4  is located outside the apparatus main body  2 . The drawer  4  is configured to support the drum cartridge  5 . The drawer  4  is configured to be movable while supporting the drum cartridge  5  between the inner position and the outer position. 
     1.4 Drum Cartridge 
     The drum cartridge  5  is mountable to the drawer  4 . The drum cartridge  5  includes a photosensitive drum  13 , a charging roller  14 , and a developing device  15 . 
     The photosensitive drum  13  is configured to be rotatable about a rotary Axis A 1 . A direction in which the rotary Axis A 1  of the photosensitive drum  13  extends is defined as an axis direction. The photosensitive drum  13  extends in the axis direction, and has a cylindrical shape. 
     The charging roller  14  is configured to charge a peripheral surface of the photosensitive drum  13 . The charging roller  14  is in contact with the peripheral surface of the photosensitive drum  13 . In the meantime, the drum cartridge  5  may include a non-contact type charger such as a scorotron-type charger, instead of the charging roller  14 . 
     The developing device  15  is configured to be movable relative to the photosensitive drum  13 . The developing device  15  includes a developing roller  16 . 
     The developing roller  16  is in contact with the photosensitive drum  13 . The developing roller  16  can supply the toner in the developing device  15  to the photosensitive drum  13 . Thereby, the developing roller  16  is configured to develop a latent image formed on the photosensitive drum  13  by the toner, thereby forming a toner image on the peripheral surface of the photosensitive drum  13 . 
     1.5 Exposure Device 
     The exposure device  6  is configured to form a latent image by exposing the photosensitive drum  13 . Specifically, the exposure device  6  is configured to expose the peripheral surface of the photosensitive drum  13  charged by the charging roller  14 . Thereby, a latent image is formed on the peripheral surface of the photosensitive drum  13 . The exposure device  6  is located above the drawer  4 . Specifically, the exposure device  6  is a laser scan unit. 
     1.6 Toner Cartridge 
     The toner cartridge  7  is attachable to and detachable from the drum cartridge  5 . The toner cartridge  7  includes a toner container  17  and a waste toner container  18 . The toner container  17  can accommodate therein toner that is to be supplied to the developing roller  16 . The waste toner container  18  can accommodate therein waste toner. The waste toner indicates toner removed from the peripheral surface of the photosensitive drum  13  by a cleaning member  22 B. The cleaning member  22 B will be described later. 
     1.7 Transfer Roller 
     The transfer roller  8  is in contact with the photosensitive drum  13  in a state where the drum cartridge  5  is mounted to the drawer  4  and the drawer  4  is located at the inner position. The printing medium P fed from the sheet feeding tray  10  passes between the transfer roller  8  and the photosensitive drum  13 . At this time, the transfer roller  8  is configured to transfer the toner image formed on the peripheral surface of the photosensitive drum  13  to the printing medium P. 
     1.8 Fixing Device 
     The fixing device  9  is configured to heat and press the printing medium P having the toner image transferred thereto, thereby fixing the toner image, which has been transferred from the photosensitive drum  13  to the printing medium P, on the printing medium P. The printing medium P having passed through the fixing device  9  is discharged onto an upper surface of the apparatus main body  2 . The fixing device  9  is spaced upward from the photosensitive drum  13  in the state where the drum cartridge  5  is mounted to the drawer  4  and the drawer  4  is located at the inner position. That is, the image forming apparatus  1  is equipped on a horizontal stand or the like so that the fixing device  9  is located above the photosensitive drum  13 . 
     2. Details of Drum Cartridge 
     Subsequently, the drum cartridge  5  is described in detail with reference to  FIGS. 3 and 4 . 
     The drum cartridge  5  includes a frame  21 , a drum cleaner  22 , a waste toner conveying pipe  23 , a first screw  24 , a second screw  25 , a shaft  26 , and a seal member  27  (see  FIG. 4 ), in addition to the photosensitive drum  13 , the charging roller  14  and the developing device  15 . 
     2.1 Frame 
     The frame  21  is configured to support the photosensitive drum  13 , the charging roller  14 , the developing device  15 , the drum cleaner  22 , the waste toner conveying pipe  23  and the first screw  24 . The frame  21  has a first side plate  21 A and a second side plate  21 B. 
     As shown in  FIG. 3 , the first side plate  21 A is located at one end of the frame  21  in the axis direction. The first side plate  21 A extends in a first direction. The first direction intersects with the axis direction. Preferably, the first direction is perpendicular to the axis direction. The first direction is a direction facing toward a second part  23 B of the waste toner conveying pipe  23  from the photosensitive drum  13 . The first direction is the same direction as the direction in which the drawer  4  is moved from the inner position toward the outer position, in the state where the drum cartridge  5  is mounted to the drawer  4 . 
     The second side plate  21 B is located at the other end of the frame  21  in the axis direction. The second side plate  21 B extends in the first direction. The second side plate  21 B is located while being spaced from the first side plate  21 A in the axis direction. 
     2.2 Drum Cleaner 
     As shown in  FIG. 4 , the drum cleaner  22  includes a drum cleaner frame  22 A, and a cleaning member  22 B. That is, the drum cartridge  5  includes the cleaning member  22 B. 
     The drum cleaner frame  22 A is configured to accommodate therein the waste toner removed from the peripheral surface of the photosensitive drum  13  by the cleaning member  22 B. The drum cleaner frame  22 A is located between the first side plate  21 A (see  FIG. 3 ) and the second side plate  21 B (see  FIG. 3 ) in the axis direction. The drum cleaner frame  22 A extends in the axis direction. In the state where the drum cartridge  5  is mounted to the drawer  4 , the drum cleaner frame  22 A is located above the photosensitive drum  13 . Also, in the state where the drum cartridge  5  is mounted to the drawer  4  and the drawer  4  is located at the inner position, the drum cleaner frame  22 A is located between the photosensitive drum  13  and the fixing device  9  (see  FIG. 1 ). The drum cleaner frame  22 A has an opening  22 C for receiving the waste toner. The opening  22 C is configured to communicate with an internal space of the drum cleaner frame  22 A. 
     The cleaning member  22 B is configured to remove waste toner from the photosensitive drum  13 . The cleaning member  22 B is mounted to the drum cleaner frame  22 A. The cleaning member  22 B extends in the axis direction and has a plate shape. An edge of the cleaning member  22 B is located in the opening  22 C. The edge of the cleaning member  22 B is in contact with the peripheral surface of the photosensitive drum  13 . Thereby, when the photosensitive drum  13  is rotated, the toner attached to the peripheral surface of the photosensitive drum  13  is scraped by the edge of the cleaning member  22 B and is accommodated in the drum cleaner frame  22 A through the opening  22 C. In the state where the drum cartridge  5  is mounted to the drawer  4 , the cleaning member  22 B is located above the photosensitive drum  13 . Also, as shown in  FIG. 1 , in the state where the drum cartridge  5  is mounted to the drawer  4  and the drawer  4  is located at the inner position, the cleaning member  22 B is located between the photosensitive drum  13  and the fixing device  9  in the vertical direction. 
     2.3 Waste Toner Conveying Pipe 
     As shown in  FIG. 3 , the waste toner conveying pipe  23  is configured to convey the waste toner removed from the photosensitive drum  13  by the cleaning member  22 B (see  FIG. 4 ). The waste toner conveying pipe  23  has a first part  23 A and a second part  23 B. 
     The first part  23 A is configured to couple the drum cleaner  22  and the second part  23 B with each other. The first part  23 A is supported by the first side plate  21 A. The first part  23 A is located at an opposite side to the second side plate  21 B with respect to the first side plate  21 A in the axis direction. The first part  23 A extends in the first direction. 
     The second part  23 B is located between the first side plate  21 A and the second side plate  21 B in the axis direction. The second part  23 B has a cylindrical shape extending in the axis direction. As shown in  FIGS. 3 and 4 , the second part  23 B has a waste toner discharge port  28 . That is, the waste toner conveying pipe  23  has the waste toner discharge port  28 . 
     The waste toner in the waste toner conveying pipe  23  is discharged through the waste toner discharge port  28 . The waste toner discharge port  28  is located at a substantial center between the first side plate  21 A and the second side plate  21 B in the axis direction. 
     2.4 First Screw 
     As shown in  FIGS. 3 and 4 , the first screw  24  is located in the drum cleaner frame  22 A. The first screw  24  extends in the axis direction. Thereby, the first screw  24  can convey the waste toner in the drum cleaner frame  22 A in the axis direction. The first screw  24  is, specifically, an auger screw. 
     2.5 Second Screw 
     As shown in  FIG. 3 , the second screw  25  is located in the waste toner conveying pipe  23 . The second screw  25  extends in the direction in which the waste toner conveying pipe  23  extends. The second screw  25  is configured to convey the waste toner conveyed by the first screw  24  to the waste toner discharge port  28 . The second screw  25  is, specifically, a shaftless screw. 
     2.6 Shaft 
     As shown in  FIGS. 3 and 4 , the shaft  26  is located between the photosensitive drum  13  and the waste toner conveying pipe  23  in the first direction. The shaft  26  extends in the axis direction. Specifically, the shaft  26  extends along a swing shaft A 2  (see  FIG. 4 ) of the developing device  15 . The shaft  26  has a circular column shape. The shaft  26  is supported by the frame  21 . Specifically, the shaft  26  has one end portion and the other end portion in the axis direction. The other end portion is spaced from the one end portion in the axis direction. The one end portion of the shaft  26  penetrates the first side plate  21 A. The other end portion of the shaft  26  penetrates the second side plate  21 B. The one end portion of the shaft  26  penetrates the first side plate  21 A and the other end portion of the shaft  26  penetrates the second side plate  21 B, so that the shaft  26  is supported by the frame  21 . 
     2.7 Developing Device 
     As shown in  FIG. 4 , the developing device  15  includes a developing frame  31 , a first shutter  32 , a lever  33 A, and a lever  33 B (see  FIG. 3 ), in addition to the developing roller  16 . 
     2.7.1 Developing Frame 
     As shown in  FIG. 3 , the developing frame  31  is located between the first side plate  21 A and the second side plate  21 B in the axis direction. The developing frame  31  extends in the axis direction. As shown in  FIG. 4 , the developing frame  31  is mounted to the shaft  26 . The developing frame  31  can swing relative to the shaft  26 . The developing frame  31  is mounted to the shaft  26 , so that the developing device  15  is supported by the frame  21  to be swingable relative to the swing shaft A 2 . The developing device  15  is supported by the frame  21  to be swingable relative to the swing shaft A 2 , thereby being capable of moving relative to the photosensitive drum  13 . Thereby, the developing device  15  can be moved relative to the photosensitive drum  13 , in accordance with vibrations of the developing roller  16 , which are generated when the photosensitive drum  13  and the developing roller  16  are rotated. 
     The developing frame  31  has a toner accommodation part  31 A and a toner cartridge support part  31 B. 
     The toner accommodation part  31 A is located between the toner cartridge support part  31 B and the photosensitive drum  13  in the first direction. The toner accommodation part  31 A is configured to support the developing roller  16 . The toner accommodation part  31 A is configured to accommodate therein the toner that is to be supplied to the developing roller  16 . 
     The toner cartridge support part  31 B is configured to support the toner cartridge  7  in a state where the toner cartridge  7  (see  FIG. 8 ) is attached to the drum cartridge  5 . The toner cartridge support part  31 B has a tray shape. Specifically, the toner cartridge support part  31 B has a third side plate  34 A, a fourth side plate  34 B (see  FIG. 3 ), and a partitioning plate  35 . 
     As shown in  FIG. 3 , the third side plate  34 A is located at one end of the toner cartridge support part  31 B in the axis direction. The third side plate  34 A extends in the first direction. The third side plate  34 A has a guide groove  341 , as shown in  FIG. 4 . The guide groove  341  extends in the first direction. In the state where the toner cartridge  7  is attached to the drum cartridge  5 , a rib  46 A (see  FIG. 5 ) of the toner cartridge  7  is fitted in the guide groove  341 . The rib  46 A will be described later. 
     As shown in  FIG. 3 , the fourth side plate  34 B is located at the other end of the toner cartridge support part  31 B in the axis direction. The fourth side plate  34 B extends in the first direction. The fourth side plate  34 B is located with an interval from the third side plate  34 A in the axis direction. In the state where the toner cartridge  7  is attached to the drum cartridge  5 , the toner cartridge  7  is located between the third side plate  34 A and the fourth side plate  34 B in the axis direction. The fourth side plate  34 B has a guide groove of which a shape is the same as the guide groove  341  of the third side plate  34 A. The guide groove of the fourth side plate  34 B is not shown. In the state where the toner cartridge  7  is attached to the drum cartridge  5 , a rib  46 B (see  FIG. 5 ) of the toner cartridge  7  is fitted in the guide groove of the fourth side plate  34 B. The rib  46 B will be described later. 
     The partitioning plate  35  is located between the third side plate  34 A and the fourth side plate  34 B in the axis direction. The partitioning plate  35  extends in the axis direction. One end of the partitioning plate  35  in the axis direction connects to the third side plate  34 A. 
     The other end of the partitioning plate  35  in the axis direction connects to the fourth side plate  34 B. As shown in  FIG. 4 , the partitioning plate  35  is configured to partition the toner accommodation part  31 A and the toner cartridge support part  31 B. The partitioning plate  35  conforms to an outer surface of the toner cartridge  7  in the state where the toner cartridge  7  (see  FIG. 8 ) is attached to the drum cartridge  5 . Specifically, the partitioning plate  35  has a semi-cylindrical shape. The partitioning plate  35  has a toner receiving port  35 A and an opening  35 B. That is, the developing device  15  has the toner receiving port  35 A and the opening  35 B. 
     As shown in  FIG. 8 , the toner receiving port  35 A can receive the toner in a state where the toner cartridge  7  is attached to the drum cartridge  5 , the first shutter  32  is located at the opening position and the second shutter  42  is located at the opening position. The first shutter  32  and the second shutter  42  will be described later. The toner receiving port  35 A is configured to communicate with an internal space of the toner accommodation part  31 A. The toner receiving port  35 A is located between the third side plate  34 A (see  FIG. 3 ) and the fourth side plate  34 B (see  FIG. 3 ) in the axis direction. The toner receiving port  35 A is located at a center of the developing frame  31  in the axis direction. 
     The opening  35 B is spaced from the toner receiving port  35 A in a circumferential direction of the partitioning plate  35 . In other words, the opening  35 B is spaced from the toner receiving port  35 A in a moving direction of the first shutter  32 . The opening  35 B is located at a center of the developing frame  31  in the axis direction. The opening  35 B and the toner receiving port  35 A are arranged along the moving direction of the first shutter  32 . The opening  35 B is configured to communicate with the waste toner discharge port  28  of the waste toner conveying pipe  23 . Also, the opening  35 B is configured to communicate with the waste toner receiving port  45  of the toner cartridge  7  in a state where the toner cartridge  7  is attached to the developing device  15 , the first shutter  32  is located at the opening position, and the second shutter  42  is located at the opening position. The second shutter  42  and the waste toner receiving port  45  will be described later. 
     2.7.2 First Shutter 
     As shown in  FIGS. 4 and 8 , the first shutter  32  is movable relative to the developing frame  31  between a closing position (see  FIG. 4 ) at which the first shutter  32  closes the opening  35 B and an opening position (see  FIG. 8 ) at which the first shutter  32  opens the opening  35 B. The first shutter  32  has a semi-cylindrical shape conforming to the partitioning plate  35 . The first shutter  32  extends in the axis direction. The first shutter  32  can move in the circumferential direction of the partitioning plate  35  along a curve of the partitioning plate  35 . The first shutter  32  has an opening  32 A and an opening  32 B. 
     As shown in  FIG. 8 , the opening  32 A is configured to communicate with the toner receiving port  35 A in a state where the first shutter  32  is located at the opening position. Thereby, the first shutter  32  opens the toner receiving port  35 A in the state where the first shutter  32  is located at the opening position. Also, as shown in  FIG. 4 , the opening  32 A is spaced from the toner receiving port  35 A and does not communicate with the toner receiving port  35 A in the state where the first shutter  32  is located at the closing position. In this case, the first shutter  32  covers the toner receiving port  35 A. Thereby, when the first shutter  32  is located at the closing position, the first shutter  32  closes the toner receiving port  35 A. The opening  32 A is located at a center of the first shutter  32  in the axis direction. 
     As shown in  FIG. 8 , the opening  32 B is configured to communicate with the opening  35 B in the state where the first shutter  32  is located at the opening position. That is, the first shutter  32  opens the opening  35 B and the toner receiving port  35 A when located at the opening position. Also, as shown in  FIG. 4 , the opening  32 B is spaced from the opening  35 B and does not communicate with the opening  35 B in the state where the first shutter  32  is located at the closing position. In this case, the first shutter  32  covers the opening  35 B. That is, the first shutter  32  closes the opening  35 B and the toner receiving port  35 A when located at the closing position. The opening  32 B and the opening  32 A are arranged in the moving direction of the first shutter  32 . The opening  32 B is located at the center of the first shutter  32  in the axis direction. 
     2.7.3 Two Levers 
     As shown in  FIGS. 4 and 8 , the lever  33 A is configured to be movable relative to the developing frame  31  between a first position (see  FIG. 4 ) at which the first shutter  32  is located at the closing position and a second position (see  FIG. 8 ) at which the first shutter  32  is located at the opening position, in the state where the toner cartridge  7  is attached to the drum cartridge  5 . The lever  33 A connects to one end of the first shutter  32  in the axis direction. The lever  33 A is configured to be pivotable relative to a third shaft A 3  between the first position and the second position, in the state where the toner cartridge  7  is attached to the drum cartridge  5 . As shown in  FIG. 4 , the lever  33 A has a guide groove  331  and a guide groove  332 . 
     The guide groove  331  is located between the first shutter  32  and the guide groove  341  in the first direction, in the state where the lever  33 A is located at the first position. In the state where the toner cartridge  7  is attached to the drum cartridge  5 , a rib  48  (see  FIG. 5 ) of the toner cartridge  7  is fitted in the guide groove  331 . The rib  48  will be described later. The guide groove  331  extends in the first direction in the state where the lever  33 A is located at the first position. The guide groove  331  continues to the guide groove  341  in the first direction in the state where the lever  33 A is located at the first position. 
     The guide groove  332  is located at an opposite side to the guide groove  331  with respect to the guide groove  341  in the first direction, in the state where the lever  33 A is located at the first position. In the state where the toner cartridge  7  is attached to the drum cartridge  5 , a rib  49  (see  FIG. 5 ) of the toner cartridge  7  is fitted in the guide groove  332 . The rib  49  will be described later. The guide groove  332  extends in the first direction in the state where the lever  33 A is located at the first position. The guide groove  332  continues to the guide groove  341  in the first direction in the state where the lever  33 A is located at the first position. 
     In the state where the lever  33 A is located at the first position, the guide groove  331 , the guide groove  341  and the guide groove  332  form a linear groove extending in the first direction. Thereby, when a user attaches the toner cartridge  7  to the drum cartridge  5 , the rib  48  of the toner cartridge  7  can be guided to the guide groove  331  through the guide groove  332  and the guide groove  341 . Also, when the user attaches the toner cartridge  7  to the drum cartridge  5 , the rib  46 A of the toner cartridge  7  can be guided to the guide groove  341  through the guide groove  332 . 
     In the meantime, as shown in  FIG. 8 , in the state where the lever  33 A is located at the second position, the guide groove  331  and the guide groove  332  are inclined relative to the guide groove  341 . Thereby, in the state where the toner cartridge  7  is attached to the drum cartridge  5 , when the lever  33 A is located at the second position, the rib  48  of the toner cartridge  7  does not pass from the guide groove  331  to the guide groove  341 , and the rib  46 A of the toner cartridge  7  does not pass from the guide groove  341  to the guide groove  332 . For this reason, in the state where the toner cartridge  7  is attached to the drum cartridge  5 , when the lever  33 A is located at the second position, the toner cartridge  7  cannot be detached from the drum cartridge  5 . 
     2.8 Seal Member 
     As shown in  FIG. 4 , the seal member  27  is located between the partitioning plate  35  of the developing device  15  and the waste toner conveying pipe  23 . The seal member  27  is configured to seal between the waste toner discharge port  28  and the opening  35 B. The seal member  27  is configured to surround the waste toner discharge port  28  and the opening  35 B. Thereby, the seal member  27  blocks the waste toner from being leaked from between the waste toner discharge port  28  and the opening  35 B. The seal member  27  can be deformed when the developing device  15  is moved relative to the photosensitive drum  13 . Specifically, when the developing device  15  is moved in a direction of getting away from the photosensitive drum  13 , the seal member  27  is pressed by the partitioning plate  35  and is thus shrunken in a direction in which the opening  35 B comes close to the waste toner discharge port  28 . Also, when the developing device  15  is moved in a direction of coming close to the photosensitive drum  13 , the seal member  27  is restored from the shrunken state by the elasticity and presses the partitioning plate  35  in a direction in which the opening  35 B gets away from the waste toner discharge port  28 . 
     3. Details of Toner Cartridge 
     Subsequently, the toner cartridge  7  is described in detail with reference to  FIGS. 5 to 6C . 
     The toner cartridge  7  shown in  FIG. 5  is attachable to and detachable from the toner cartridge support part  31 B (see  FIG. 3 ) of the developing device  15 . The toner cartridge  7  is configured to be movable relative to the photosensitive drum  13  together with the developing device  15 , with being attached to the developing device  15  (see  FIG. 8 ). The toner cartridge  7  includes a housing  41  and a second shutter  42 . 
     3.1 Housing 
     The housing  41  can accommodate therein the toner that is to be supplied to the developing roller  16 . As shown in  FIG. 6A , the housing  41  has a first cylindrical part  41 A and a second cylindrical part  41 B. 
     The first cylindrical part  41 A has a cylindrical shape. The first cylindrical part  41 A extends in the axis direction in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     The second cylindrical part  41 B has a cylindrical shape. The second cylindrical part  41 B extends in the axis direction in the state where the toner cartridge  7  is attached to the drum cartridge  5 . The second cylindrical part  41 B and the first cylindrical part  41 A are arranged along the first direction in the state where the toner cartridge  7  is attached to the drum cartridge  5 . In other words, the second cylindrical part  41 B and the first cylindrical part  41 A are arranged along a radial direction of the first cylindrical part  41 A in the state where the toner cartridge  7  is attached to the drum cartridge  5 . As shown in  FIGS. 5 and 6C , a part of the second cylindrical part  41 B in the axis direction connects to the first cylindrical part  41 A in the first direction. In other words, a part of the second cylindrical part  41 B in the axis direction connects to the first cylindrical part  41 A in the radial direction of the first cylindrical part  41 A. Specifically, each of both end portions of the second cylindrical part  41 B in the axis direction connects to the first cylindrical part  41 A in the first direction, and as shown in  FIGS. 5 and 6B , a central portion of the second cylindrical part  41 B in the axis direction is spaced from the first cylindrical part  41 A in the first direction. An internal space of the second cylindrical part  41 B communicates with an internal space of the first cylindrical part  41 A at a part at which the first cylindrical part  41 A and the second cylindrical part  41 B interconnect. 
     In the housing  41 , a part of the first cylindrical part  41 A in the radial direction and a part of the second cylindrical part  41 B in the radial direction are demarcated as the waste toner container  18 . The waste toner container  18  is provided therein with a belt conveyor  18 A for conveying the waste toner. Also, a part of the housing  41  except the waste toner container  18  is the toner container  17 . The toner container  17  is provided therein with agitators  17 A,  17 B for stirring the toner. The agitator  17 A is located in the first cylindrical part  41 A, and the agitator  17 B is located in the second cylindrical part  41 B. 
     Also, as shown in  FIGS. 5 and 6B , the housing  41  has a toner discharge port  44 , a waste toner receiving port  45 , a rib  46 A, and a rib  46 B. That is, the toner cartridge  7  has the toner discharge port  44  and the waste toner receiving port  45 . 
     As shown in  FIG. 6B , the toner discharge port  44  is located on a peripheral surface of the first cylindrical part  41 A. The toner discharge port  44  is configured to communicate with an internal space of the toner container  17 . Through the toner discharge port  44 , the toner in the first cylindrical part  41 A can be discharged. 
     The waste toner receiving port  45  is located on the peripheral surface of the first cylindrical part  41 A. The waste toner receiving port  45  is spaced from the toner discharge port  44  in a circumferential direction of the first cylindrical part  41 A. In other words, the waste toner receiving port  45  is spaced from the toner discharge port  44  in a moving direction of the second shutter  42 . The waste toner receiving port  45  and the toner discharge port  44  are arranged along the moving direction of the second shutter  42 . The waste toner receiving port  45  is configured to communicate with the waste toner container  18 . As shown in  FIG. 8 , the waste toner from the waste toner conveying pipe  23  can be received through the waste toner receiving port  45 , in the state where the toner cartridge  7  is attached to the drum cartridge  5 , the first shutter  32  is located at the opening position, and the second shutter  42  is located at the opening position. 
     As shown in  FIG. 5 , the rib  46 A is located on one side surface of the first cylindrical part  41 A in the axis direction. The rib  46 A protrudes from one side surface of the first cylindrical part  41 A in the axis direction. The rib  46 A extends in the radial direction of the first cylindrical part  41 A. The rib  46 A extends in the first direction in the state where the toner cartridge  7  is attached to the drum cartridge  5 . The rib  46 A is fitted in the guide groove  341  (see  FIG. 4 ) of the third side plate  34 A of the drum cartridge  5  in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     The rib  46 B is spaced from the rib  46 A in the axis direction. The rib  46 B is located on the other side surface of the first cylindrical part  41 A in the axis direction. The rib  46 B protrudes from the other side surface of the first cylindrical part  41 A in the axis direction. The rib  46 B extends in the radial direction of the first cylindrical part  41 A. The rib  46 B extends in the first direction in the state where the toner cartridge  7  is attached to the drum cartridge  5 . The rib  46 B is fitted in the guide groove  341  (not shown) of the fourth side plate  34 B of the drum cartridge  5  in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     3.2 Second Shutter 
     The second shutter  42  is configured to be movable relative to the first cylindrical part  41 A between the closing position (see  FIG. 6B ) and the opening position (see  FIG. 8 ). As shown in  FIG. 5 , the second shutter  42  has a cylindrical part  42 A, a first side plate  42 B, and a second side plate  42 C. 
     The cylindrical part  42 A is configured to cover the peripheral surface of the first cylindrical part  41 A. The cylindrical part  42 A extends in the axis direction. The cylindrical part  42 A has a cylindrical shape. The cylindrical part  42 A has a first opening  421  (see  FIG. 6B ), a second opening  422 , a third opening  423  and a fourth opening  424 . 
     As shown in  FIG. 8 , the first opening  421  communicates with the toner discharge port  44  in the state where the second shutter  42  is located at the opening position. Thereby, the second shutter  42  opens the toner discharge port  44  when located at the opening position. Also, as shown in  FIG. 6B , the first opening  421  is distant from the toner discharge port  44  and does not communicate with the toner discharge port  44  in the state where the second shutter  42  is located at the closing position. In this case, the cylindrical part  42 A of the second shutter  42  covers the toner discharge port  44 . Thereby, the second shutter  42  closes the toner discharge port  44  when located at the closing position. 
     The second opening  422  is spaced from the first opening  421  in a circumferential direction of the cylindrical part  42 A. As shown in  FIG. 8 , the second opening  422  communicates with the waste toner receiving port  45  in the state where the second shutter  42  is located at the opening position. Thereby, the second shutter  42  opens the waste toner receiving port  45  when located at the opening position. Also, as shown in  FIG. 6B , the second opening  422  is distant from the waste toner receiving port  45  and does not communicate with the waste toner receiving port  45  in the state where the second shutter  42  is located at the closing position. In this case, the cylindrical part  42 A of the second shutter  42  covers the waste toner receiving port  45 . Thereby, the second shutter  42  closes the waste toner receiving port  45  when located at the closing position. 
     As shown in  FIG. 5 , the third opening  423  is spaced from the second opening  422  in the axis direction. A connection part of the first cylindrical part  41 A and the second cylindrical part  41 B passes through the third opening  423 . 
     The fourth opening  424  is located at an opposite side to the third opening  423  with respect to the second opening  422  in the axis direction. The fourth opening  424  is spaced from the second opening  422  in the axis direction. A connection part of the first cylindrical part  41 A and the second cylindrical part  41 B passes through the fourth opening  424 . 
     The first side plate  42 B is configured to cover one side surface of the first cylindrical part  41 A in the axis direction. The first side plate  42 B is connected to one end portion of the cylindrical part  42 A in the axis direction. In the meantime, the first side plate  42 B has the same structure as the second side plate  42 C, and can be described in the same manner as the second side plate  42 C. Therefore, the description of the structure of the first side plate  42 B is omitted, and the structure of the second side plate  42 C is described in detail. 
     The second side plate  42 C is configured to cover the other side surface of the first cylindrical part  41 A in the axis direction. The second side plate  42 C is connected to the other end portion of the cylindrical part  42 A in the axis direction. The second side plate  42 C is spaced from the first side plate  42 B in the axis direction. As shown in  FIG. 6A , the second side plate  42 C has a circular shape. The second side plate  42 C has an opening  47 , a rib  48  and a rib  49 . 
     The opening  47  exposes the rib  46 B of the first cylindrical part  41 A. The opening  47  is located at a center of the second side plate  42 C in a radial direction of the second side plate  42 C. The opening  47  has a circular shape. 
     The rib  48  protrudes from the second side plate  42 C. The rib  48  extends in the radial direction of the second side plate  42 C. The rib  48  extends in the first direction in the state where the second shutter  42  is located at the closing position. The rib  48  is fitted in the guide groove  331  of the fourth side plate  34 B (see  FIG. 3 ) of the drum cartridge  5  in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     The rib  49  protrudes from the second side plate  42 C. The rib  49  extends in the radial direction of the second side plate  42 C. The rib  49  is located at an opposite side to the rib  48  with respect to the opening  47  in the first direction, in the state where the second shutter  42  is located at the closing position. In the state where the second shutter  42  is located at the closing position, the rib  49  forms a linear rib extending in the first direction, together with the rib  46 B and the rib  48 . The rib  49  is fitted in the guide groove  332  of the fourth side plate  34 B (see  FIG. 3 ) of the drum cartridge  5 , in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     The rib  48  of the first side plate  42 B is fitted in the guide groove  331  of the lever  33 A and the rib  49  of the first side plate  42 B is fitted in the guide groove  332  of the lever  33 A, so that the lever  33 A and the first side plate  42 B are connected to each other and can rotate together. Also, the rib  48  of the second side plate  42 C is fitted in the guide groove  331  of the lever  33 B and the rib  49  of the second side plate  42 C is fitted in the guide groove  332  of the lever  33 B, so that the lever  33 B and the second side plate  42 C are connected to each other and can rotate together. 
     When the first side plate  42 B is rotated together with the lever  33 A and the second side plate  42 C is rotated together with the lever  33 B, the first shutter  32  moves together with the second shutter  42 . That is, the first shutter  32  is capable of moving together with the second shutter  42  in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     4. Attaching and Detaching of Toner Cartridge to and from Drum Cartridge 
     Subsequently, attaching and detaching of the toner cartridge  7  to and from the drum cartridge  5  are described with reference to  FIGS. 2, 7 and 8 . 
     As shown in  FIG. 2 , the user can attach and detach the toner cartridge  7  to and from the drum cartridge  5  in a state where the drawer  4  having the drum cartridge  5  mounted thereto is located at the outer position. 
     Specifically, as shown in  FIG. 7 , the user attaches the toner cartridge  7  to the drum cartridge  5  in the state where the lever  33 A is located at the first position and the lever  33 B (see  FIG. 3 ) is located at the first position. At this time, the lever  33 A is located at the first position and the lever  33 B is located at the first position, so that the first shutter  32  is located at the closing position. Also, the second shutter  42  is located at the closing position. 
     When the toner cartridge  7  is attached to the drum cartridge  5 , the rib  48  (see  FIG. 5 ) is fitted in the guide groove  331  (see  FIG. 7 ), the rib  49  (see  FIG. 5 ) is fitted in the guide groove  332  (see  FIG. 7 ) and the rib  46 A (see  FIG. 5 ) is fitted in the guide groove  341  (see  FIG. 7 ), so that the lever  33 A of the drum cartridge  5  and the first side plate  42 B of the toner cartridge  7  can be rotated together. Thereby, the first shutter  32  can be moved together with the second shutter  42  can be moved together. 
     Then, as shown in  FIGS. 7 and 8 , the user moves the lever  33 A from the first position to the second position, and moves the lever  33 B (see  FIG. 3 ) from the first position to the second position. 
     Thereby, the first side plate  42 B is rotated together with the lever  33 A and the second side plate  42 C is rotated together with the lever  33 B, so that the first shutter  32  is moved from the closing position to the opening position and the second shutter  42  is moved from the closing position to the opening position. 
     Then, as shown in  FIG. 8 , when the first shutter  32  is located at the opening position and the second shutter  42  is located at the opening position, the attaching of the toner cartridge  7  to the drum cartridge  5  is completed. 
     Also, as shown in  FIGS. 7 and 8 , when detaching the toner cartridge  7  from the drum cartridge  5 , the user moves the lever  33 A from the second position to the first position, and moves the lever  33 B from the second position to the first position. 
     Thereby, the first side plate  42 B is rotated together with the lever  33 A and the second side plate  42 C is rotated together with the lever  33 B, so that the first shutter  32  is moved from the opening position to the closing position and the second shutter  42  is moved from the opening position to the closing position. 
     Then, after the first shutter  32  is located at the closing position and the second shutter  42  is located at the closing position, the user detaches the toner cartridge  7  from the drum cartridge  5 . 
     In the meantime, the toner cartridge  7  may be attached to and detached from the drum cartridge  5  in a state where the drum cartridge  5  is demounted from the drawer  4 . 
     5. Operational Effects 
     As shown in  FIG. 8 , in the image forming apparatus  1 , the drum cartridge  5  is capable of being mounted to the drawer  4  and the toner cartridge  7  is capable of being attached to the drum cartridge  5 . 
     For this reason, in the image forming apparatus  1  where the cleaning member  22 B is located between the photosensitive drum  13  and the fixing device  9  in the state where the drum cartridge  5  is mounted to the drawer  4  and the drawer  4  is located at the inner position, it is possible to individually replace the drum cartridge  5  and the toner cartridge  7 , as shown in  FIG. 2 . 
     Thereby, it is possible to replace each of the drum cartridge  5  and the toner cartridge  7  at an appropriate time, in accordance with each lifetime. 
     Also, in the image forming apparatus  1 , it is possible to convey the waste toner removed by the cleaning member  22 B to the waste toner container  18  (see  FIG. 1 ) through the waste toner conveying pipe  23  (see  FIG. 5 ), and to replace the waste toner container  18  together with the toner container  17 , as shown in  FIG. 2 . 
     Also, as shown in  FIG. 4 , in the image forming apparatus  1 , the developing device  15  is swingably supported by the frame  21 , so that the toner cartridge  7  can be moved relative to the photosensitive drum  13  together with the developing device  15  in the state where the toner cartridge  7  is attached to the drum cartridge  5 . 
     Thereby, in the state where the waste toner container  18  is fixed to the drum cartridge  5 , the toner cartridge  7  can swing relative to the photosensitive drum  13  together with the developing device  15 , in accordance with vibrations of the developing roller  16  which are generated when the photosensitive drum  13  and the developing roller  16  are rotated. 
     6. Second Exemplary Embodiment 
     Subsequently, a second exemplary embodiment is described with reference to  FIGS. 9 to 11B . In the second exemplary embodiment, the same members as the first exemplary embodiment are denoted with the same reference numerals, and the descriptions thereof are omitted. 
     6.1 Outline of Second Exemplary Embodiment 
     As shown in  FIG. 9 , a toner cartridge  60  is attachable to and detachable from a frame  51  of a drum cartridge  50 . In this case, the developing device  15  is not provided with the toner cartridge support part  31 B, and is configured to be movable relative to the photosensitive drum  13  and the toner cartridge  60  in a state where the toner cartridge  60  is attached to the drum cartridge  50 . 
     Hereinafter, the second exemplary embodiment is described in detail. 
     6.2 Details of Drum Cartridge 
     The frame  51  of the drum cartridge  50  includes a toner cartridge support part  52 , a wall  53 , a first shutter  54 , a seal member  55 , and a waste toner conveying pipe  56 , unlike the frame  21  of the drum cartridge  5  of the first exemplary embodiment. 
     6.2.1 Toner Cartridge Support Part 
     The toner cartridge support part  52  is configured to support a housing  63  of the toner cartridge  60  in the state where the toner cartridge  60  is attached to the drum cartridge  50 . The toner cartridge  60  will be described later. The toner cartridge support part  52  is located between the first side plate  21 A and the second side plate  21 B in the axis direction. The toner cartridge support part  52  has a plate shape extending in the axis direction. 
     6.2.2 Wall 
     The wall  53  is located between the developing device  15  and the toner cartridge support part  52  in the first direction. The wall  53  is configured to support a toner discharge part  64  of the toner cartridge  60  in a state where the toner cartridge  60  is attached to the frame  51 . The wall  53  is located between a toner discharge port  64 A and a toner receiving port  35 A in the state where the toner cartridge  60  is attached to the frame  51 . Also, the wall  53  is located between the first side plate  21 A and the second side plate  21 B in the axis direction. The wall  53  has a semi-cylindrical shape extending in the axis direction. The wall  53  has an opening  53 A. 
     The opening  53 A is located between the first side plate  21 A and the second side plate  21 B in the axis direction. The opening  53 A communicates with the toner receiving port  35 A. 
     6.2.3 First Shutter 
     The first shutter  54  is configured to be movable relative to the wall  53  between a closing position (see  FIG. 10 ) at which the first shutter  54  closes the opening  53 A and an opening position (see  FIG. 9 ) at which the first shutter  54  opens the opening  53 A. As shown in  FIG. 10 , the first shutter  54  has a semi-cylindrical shape conforming to the wall  53 . The first shutter  54  extends in the axis direction. The first shutter  54  is configured to be rotatable in a circumferential direction of the wall  53  between the closing position and the opening position. Also, the first shutter  54  has a side plate  54 A and a side plate  54 B (not shown). 
     The side plate  54 A is located at one end portion of the first shutter  54  in the axis direction. The side plate  54 A has a groove  541 . In the state where the toner cartridge  60  is attached to the frame  51 , a rib  67 A (see  FIG. 11A ) of the toner cartridge  60  is fitted in the groove  541 . The rib  67 A will be described later. 
     The side plate  54 B (not shown) is spaced from the side plate  54 A in the axis direction. The side plate  54 B (not shown) is located at the other end portion of the first shutter  54  in the axis direction. The side plate  54 B (not shown) has a groove of which a shape is the same as the groove  541  of the side plate  54 A. 
     6.2.4 Seal Member 
     As shown in  FIGS. 9 and 10 , the seal member  55  is located between the wall  53  and the developing device  15 . The seal member  55  is configured to seal a part between the opening  53 A and the toner receiving port  35 A. The seal member  55  is configured to surround the opening  53 A and the toner receiving port  35 A. Thereby, the seal member  55  prevents the waste toner from being leaked from between the opening  53 A and the toner receiving port  35 A. The seal member  55  can be deformed when the developing device  15  is moved relative to the photosensitive drum  13 . Specifically, when the developing device  15  is moved in the direction of getting away from the photosensitive drum  13 , the seal member  55  is pressed by the developing device  15  and is thus shrunken in a direction in which the toner receiving port  35 A comes close to the opening  53 A. Also, when the developing device  15  is moved in the direction of coming close to the photosensitive drum  13 , the seal member  55  is restored from the shrunken state by the elasticity and presses the developing device  15  in a direction in which the toner receiving port  35 A gets away from the opening  53 A. 
     6.2.5 Waste Toner Conveying Pipe 
     The waste toner conveying pipe  56  shown in  FIG. 9  conveys the waste toner removed from the photosensitive drum  13  by the cleaning member  22 B (see  FIG. 4 ). The waste toner conveying pipe  56  extends in the first direction. The waste toner conveying pipe  56  is connected to a waste toner container  62  of the toner cartridge  60  in the state where the toner cartridge  60  is attached to the drum cartridge  50 . The waste toner conveying pipe  56  has a waste toner discharge port  56 A, a shutter  56 B, and a compression spring  56 C. Through the waste toner discharge port  56 A, the waste toner in the waste toner conveying pipe  56  is discharged. The shutter  56 B is configured to be movable between an opening position (see  FIG. 9 ) at which the shutter  56 B opens the waste toner discharge port  56 A and a closing position (not shown) at which the shutter  56 B closes the waste toner discharge port  56 A. The compression spring  56 C is configured to press the shutter  56 B from the opening position toward the closing position. When the toner cartridge  60  is being attached to the drum cartridge  50 , the shutter  56 B comes into contact with the waste toner container  62  and is thus moved from the opening position to the closing position against a pressing force of the compression spring  56 C. Also, when the toner cartridge  60  is being detached from the drum cartridge  50 , the shutter  56 B is pressed by the compression spring  56 C and is thus moved from the opening position to the closing position. 
     6.3 Details of Toner Cartridge 
     As shown in  FIGS. 9 and 11A , the toner cartridge  60  includes a toner container  61  and the waste toner container  62 . 
     6.3.1 Toner Container 
     The toner container  61  includes a housing  63 , a toner discharge part  64 , a lever  65 , a gear  66  and a gear  67 . 
     As shown in  FIG. 9 , the housing  63  can accommodate therein the toner that is to be supplied to the developing roller  16 . In the housing  63 , two agitators  63 A,  63 B are provided. The agitator  63 A is located between the agitator  63 B and the toner discharge part  64 . The agitator  63 A and the agitator  63 B are configured to stir the toner in the housing  63  and to convey the toner in the housing  63  toward the toner discharge part  64 . 
     Through the toner discharge part  64 , the toner in the housing  63  can be discharged. The toner discharge part  64  extends from the housing  63 . An internal space of the toner discharge part  64  communicates with an internal space of the housing  63 . Thereby, the toner in the housing  63  is received into the toner discharge part  64 . The toner discharge part  64  has a toner discharge port  64 A and a second shutter  64 B. 
     The toner discharge port  64 A communicates with the internal space of the toner discharge part  64 . Thereby, the toner in the toner discharge part  64  can be discharged through the toner discharge port  64 A. 
     The second shutter  64 B is configured to be movable between the closing position (see  FIG. 11A ) and the opening position (see  FIGS. 9 and 11B ). The second shutter  64 B has an opening  64 C. The opening  64 C communicates with the toner discharge port  64 A when the second shutter  64 B is located at the opening position. Thereby, the second shutter  64 B opens the toner discharge port  64 A when located at the opening position. Also, when the second shutter  64 B is located at the closing position, the opening  64 C is distant from the toner discharge port  64 A in a moving direction of the second shutter  64 B, and does not communicate with the toner discharge port  64 A. In this case, the second shutter  64 B covers the toner discharge port  64 A. Thereby, the second shutter  64 B closes the toner discharge port  64 A when located at the closing position. Also, the second shutter  64 B has a projection  64 D. The projection  64 D is fitted in a hole  542  (see  FIG. 9 ) of the first shutter  54  in the state where the toner cartridge  60  is attached to the drum cartridge  50 . Thereby, in the state where the toner cartridge  60  is attached to the drum cartridge  50 , the second shutter  64 B can be moved together with the first shutter  54 . 
     As shown in  FIG. 11A , the lever  65  is located on an axially outer surface of the housing  63 . The lever  65  is configured to be pivotable between a first position (see  FIG. 11A ) at which the second shutter  64 B is located at the closing position and a second position (see  FIG. 11B ) at which the second shutter  64 B is located at the opening position. The lever  65  has a plurality of gear teeth  65 A. The plurality of gear teeth  65 A is aligned in a pivoting direction of the lever  65 . 
     The gear  66  is in mesh with the gear teeth  65 A of the lever  65 . 
     The gear  67  is in mesh with the gear  66 . The gear  67  can be independently rotated from the second shutter  64 B in a state where the toner cartridge  60  is detached from the drum cartridge  50 . The gear  67  has a rib  67 A. The rib  67 A extends in the first direction in the state where the lever  65  is located at the first position. The rib  67 A extends in a direction intersecting with the first direction in the state where the lever  65  is located at the second position. The rib  67 A is fitted in the groove  541  (see  FIG. 10 ) of the first shutter  54  in the state where the toner cartridge  60  is attached to the drum cartridge  50 . Thereby, in the state where the toner cartridge  60  is attached to the drum cartridge  50 , the gear  67  can be rotated together with the first shutter  54 . 
     6.3.2 Waste Toner Container 
     As shown in  FIG. 11A , the waste toner container  62  is mounted to the housing  63 . The waste toner container  62  can be attached to and detached from the drum cartridge  50  (see  FIG. 9 ), together with the toner container  61 . The waste toner container  62  has a waste toner receiving port  62 A, a shutter  62 B, and a compression spring  62 C, as shown in  FIG. 9 . 
     The waste toner receiving port  62 A communicates with the waste toner discharge port  56 A of the waste toner conveying pipe  56  in the state where the toner cartridge  60  is attached to the drum cartridge  50 . Thereby, in the state where the toner cartridge  60  is attached to the drum cartridge  50 , the waste toner from the waste toner conveying pipe  56  can be received through the waste toner receiving port  62 A. The waste toner receiving port  62 A communicates with the internal space of the waste toner container  62 . Thereby, the waste toner received into the waste toner receiving port  62 A is accommodated in the waste toner container  62 . 
     The shutter  62 B is configured to be movable between a closing position (not shown) at which the shutter  62 B closes the waste toner receiving port  62 A and an opening position (see  FIG. 9 ) at which the shutter  62 B opens the waste toner receiving port  62 A. When the toner cartridge  60  is being attached to the drum cartridge  50 , the shutter  62 B comes into contact with the waste toner conveying pipe  56 , and is thus moved from the closing position to the opening position against a pressing force of the compression spring  62 C. Also, when the toner cartridge  60  is being detached from the drum cartridge  50 , the shutter  62 B is pressed by the compression spring  62 C and is thus moved from the opening position to the closing position. 
     6.4 Operational Effects of Second Exemplary Embodiment 
     Also in the second exemplary embodiment, it is possible to accomplish the same effects as the first exemplary embodiment. 
     7. Third Exemplary Embodiment 
     Subsequently, a third exemplary embodiment is described with reference to  FIGS. 12 to 14 . In the third exemplary embodiment, the same members as the first exemplary embodiment are denoted with the same reference numerals, and the descriptions thereof are omitted. 
     7.1 Outline of Third Exemplary Embodiment 
     As shown in  FIG. 12 , a toner container  71  is supported by the toner cartridge support part  31 B of the developing device  15 , and a waste toner container  72  is supported by the first side plate  21 A and the second side plate  21 B of the frame  21 . The toner container  71  is configured to be movable relative to the photosensitive drum  13  together with the developing device  15  in a state where the toner cartridge  70  is attached to a drum cartridge  80 . In the meantime, the waste toner container  72  is configured to be immovable relative to the photosensitive drum  13  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . 
     Hereinafter, the third exemplary embodiment is described in detail. 
     7.2 Details of Toner Cartridge 
     As shown in  FIGS. 13A and 13B , the toner cartridge  70  includes a toner container  71  and a waste toner container  72 . 
     7.2.1 Toner Container 
     The toner container  71  includes a housing  73 , a shutter  74 , and a lever  75 . That is, the toner cartridge  70  includes the shutter  74  and the lever  75 . 
     The housing  73  can accommodate therein the toner that is to be supplied to the developing roller  16 . As shown in  FIG. 12 , the housing  73  has a toner discharge port  73 A. In a state where the toner cartridge  70  is attached to the drum cartridge  80 , the shutter  74  is located at the opening position and the first shutter  32  is located at the opening position, the toner can be discharged through the toner discharge port  73 A. Also, the housing  73  is provided therein with two agitators  73 B,  73 C. The agitator  73 B is located between the agitator  73 C and the toner discharge port  73 A. The agitator  73 B and the agitator  73 C are configured to stir the toner in the housing  73  and to convey the toner in the housing  73  toward the toner discharge port  73 A. 
     The shutter  74  is configured to be movable relative to the housing  73  between the closing position (see  FIG. 13A ) and the opening position (see  FIG. 13B ). The shutter  74  has an opening  74 A. When the shutter  74  is located at the opening position, the opening  74 A communicates with the toner discharge port  73 A. Thereby, the shutter  74  opens the toner discharge port  73 A when located at the opening position. Also, when the shutter  74  is located at the closing position, the opening  74 A is distant from the toner discharge port  73 A in a moving direction of the shutter  74  and does not communicate with the toner discharge port  73 A. In this case, the shutter  74  covers the toner discharge port  73 A. Thereby, the shutter  74  closes the toner discharge port  73 A when located at the closing position. In the meantime, the shutter  74  has a projection  74 D. The projection  74 D penetrates a part of the first shutter  32  of the drum cartridge  80  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . Thereby, in the state where the toner cartridge  70  is attached to the drum cartridge  80 , the shutter  74  can be moved together with the first shutter  32 . 
     As shown in  FIGS. 13A and 13B , the lever  75  is configured to be movable between the first position (see  FIG. 13A ) and the second position (see  FIG. 13B ). Specifically, the lever  75  can be pivoted between the first position and the second position. The lever  75  is located on an outer surface of the housing  73  in the axis direction. The lever  75  is connected to an end portion of the shutter  74  in the axis direction. Thereby, the lever  75  moves the shutter  74  when being moved between the first position and the second position. The lever  75  locates the shutter  74  at the closing position when located at the first position. The lever  75  locates the shutter  74  at the opening position when located at the second position. 
     7.2.2 Waste Toner Container 
     The waste toner container  72  is movably coupled to the toner container  71 . 
     Specifically, the waste toner container  72  is described with reference to  FIG. 13B . 
     The waste toner container  72  has a coupling part  100 . The coupling part  100  has a hole  101  and a hole  102 . Also, the housing  73  of the toner container  71  has a projection  201  and a projection  202 . The projection  201  is inserted into the hole  101  and the projection  202  is inserted into the hole  102 , so that the waste toner container  72  is coupled to the toner container  71 . 
     In a state where the projection  201  is inserted in the hole  101 , the projection  201  is spaced from an the inner surface of the hole  101 . Also, in a state where the projection  202  is inserted in the hole  102 , the projection  202  is spaced from an the inner surface of the hole  102 . There is an interval between the projection  201  and the hole  101  and there is also an interval between the projection  202  and the inner surface of the hole  102 , so that the waste toner container  72  can be moved relative to the toner container  71  in the first direction and in the second direction. 
     In the third exemplary embodiment, the projection  201  and the projection  202  have a circular column shape, respectively. Also, the hole  101  and the hole  102  are a long hole that is long in the first direction, respectively. For this reason, a distance by which the waste toner container  72  is movable relative to the toner container  71  is longer in the first direction than in the second direction. 
     The toner container  71  is loosely coupled in a state where it can be moved relative to the waste toner container  72 , so that the toner container  71  can be moved relative to the waste toner container  72  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . Specifically, in the state where the toner cartridge  70  is attached to the drum cartridge  80 , it is possible to move the toner container  71  and the developing device  15  relative to the photosensitive drum  13  while keeping a state where the waste toner container  72  is not moved relative to the waste toner conveying pipe  81  and the frame  21 . With the structure where the toner container  71  can be moved relative to the waste toner container  72  in the state where the waste toner container  72  is not moved relative to the waste toner conveying pipe  81  and the frame  21 , it is possible to prevent the waste toner from being leaked from a coupled part of the waste toner container  72  and the waste toner conveying pipe  81  and to also bring the developing device  15  into contact with the photosensitive drum  13  at an optimal position for the developing. 
     The waste toner container  72  has an engagement part  76 . A part of the lever  75  is engaged with the engagement part  76  when the lever  75  is located at the first position. Specifically, the engagement part  76  is a concave part in which a handle  75 A of the lever  75  is fitted. As shown in  FIG. 13A , when the lever  75  is located at the first position, a part of the lever  75  is engaged with the engagement part  76  of the waste toner container  72 , so that the waste toner container  72  cannot be moved relative to the toner container  71 . Also, as shown in  FIG. 13B , when the lever  75  is located at the second position, the engagement between the part of the lever  75  and the engagement part  76  of the waste toner container  72  is released, so that the waste toner container  72  can be moved relative to the toner container  71 . 
     7.3 Details of Drum Cartridge 
     As shown in  FIG. 12 , the drum cartridge  80  includes a waste toner conveying pipe  81  and an engagement part  82 , in addition to the photosensitive drum  13 , the charging roller  14 , the drum cleaner  22 , and the developing device  15 . 
     7.3.1 Waste Toner Conveying Pipe 
     The waste toner conveying pipe  81  interconnects the drum cleaner  22  and the waste toner container  72  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . The waste toner conveying pipe  81  is configured to convey the waste toner from the drum cleaner  22  to the waste toner container  72  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . As shown in  FIGS. 12 and 14 , the waste toner conveying pipe  81  is configured to be movable between an attaching position (see  FIG. 12 ) and a detaching position (see  FIG. 14 ) while being connected to the waste toner container  72 . When the waste toner conveying pipe  81  is located at the attaching position, the toner cartridge  70  is attached to the frame  21 . When the waste toner conveying pipe  81  is located at the detaching position, the toner cartridge  70  is detached from the frame  21 . The toner cartridge  70  can be attached to and detached from the waste toner conveying pipe  81  in the state where the waste toner conveying pipe  81  is located at the detaching position. In the state where the waste toner conveying pipe  81  is located at the detaching position, the toner cartridge  70  is detached from the waste toner conveying pipe  81  and is thus separated from the drum cartridge  80 . Also, in the state where the waste toner conveying pipe  81  is located at the detaching position, the toner cartridge  70  is attached to the waste toner conveying pipe  81  and the waste toner conveying pipe  81  is then moved from the detaching position to the attaching position, so that the toner cartridge  70  is attached to the drum cartridge  80 . 
     7.3.2 First Guide and Second Guide 
     As shown in  FIGS. 14 and 15 , the frame  21  has a first guide  83  and a third guide  85 , and the developing device  15  has a second guide  84 . When the toner cartridge  70  is being attached to the drum cartridge  80 , the first guide  83  guides the projection  103  of the waste toner container  72 . When the toner cartridge  70  is being attached to the drum cartridge  80 , the third guide  85  guides the projection  105  of the waste toner container  72 . Thereby, the waste toner container  72  is supported by the frame  21  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . When the toner cartridge  70  is being attached to the drum cartridge  80 , the second guide  84  guides the projection  204  of the toner container  71 . Thereby, the toner container  71  is supported by the developing device  15  in the state where the toner cartridge  70  is attached to the drum cartridge  80 . 
     7.3.3 Engagement Part 
     The engagement part  82  is provided to the developing device  15 . As shown in  FIG. 12 , when the toner cartridge  70  is attached to the drum cartridge  80  and the lever  75  is located at the second position, a part of the lever  75  is engaged with the engagement part  82 . Specifically, the engagement part  82  is a concave part in which a handle  75 A of the lever  75  is to be fitted. When the lever  75  is located at the second position, the engagement between the part of the lever  75  and the engagement part  76  of the waste toner container  72  is released, so that the toner container  71  can be moved relative to the waste toner container  72 , and the part of the lever  75  and the engagement part  82  of the developing device  15  are engaged with each other, so that the toner container  71  can be moved relative to the photosensitive drum  13 , together with the developing device  15 . 
     7.4 Operational Effects of Third Exemplary Embodiment 
     Also in the third exemplary embodiment, it is possible to accomplish the same operational effects as the first exemplary embodiment. 
     The foregoing description of the exemplary embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents.