Patent Publication Number: US-11392058-B2

Title: Toner refilling portion of development cartridge to provide feedback indicating inlet shutter position

Description:
BACKGROUND 
     An image forming apparatus using an electrophotographic method supplies toner to an electrostatic latent image formed on a photoreceptor to form a visible toner image on the photoconductor, transfers the toner image to a printing medium via an intermediate transfer medium or directly to a printing medium, and then fixes the transferred toner image on the printing medium. 
     A development cartridge contains the toner, and supplies toner to the electrostatic latent image formed on the photoconductor to form a visible toner image. When the toner contained in the development cartridge is exhausted, the development cartridge is removed from a body of the image forming apparatus, and a new development cartridge may be mounted on a main body of the image forming apparatus. The development cartridge may also be refilled with a new toner by using a toner refill kit (toner refill cartridge). 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of the exterior of an electrophotographic image forming apparatus according to an example; 
         FIG. 2  is a schematic structural diagram of the electrophotographic image forming apparatus of  FIG. 1  according to an example; 
         FIG. 3  is a perspective view of a development cartridge included in the electrophotographic image forming apparatus illustrated in  FIG. 1 , according to an example; 
         FIG. 4  is a partially exploded perspective view of a toner refill cartridge, according to an example; 
         FIGS. 5A and 5B  are views of a toner refill cartridge accessing a toner refilling portion from outside a main body of an image forming apparatus through a communicating portion, according to an example; 
         FIG. 6  is a perspective view of a toner refilling portion equipped with a toner refill cartridge, according to an example; 
         FIG. 7  is a view for explaining an electrical connection between a connection interface of a toner refill cartridge and a first connector of a toner refilling portion, according to an example; 
         FIG. 8  is a view for explaining a connection structure between a toner refill cartridge, a toner refilling portion in a development cartridge, and a controller, according to an example; 
         FIG. 9  is a view for explaining information transmission between a toner refill cartridge, a toner refilling portion, and a controller when the toner refill cartridge is mounted on the toner refilling portion in a development cartridge, according to an example; 
         FIG. 10  is a block diagram of an image forming apparatus, according to an example; 
         FIG. 11  is an exploded perspective view of a toner refilling portion according to an example; 
         FIG. 12  illustrates an inlet shutter in a blocking position; 
         FIG. 13  illustrates an inlet shutter in an inlet position; 
         FIG. 14  is a schematic structural diagram of a switching unit according to an example, in which a first latch member is in a first position; 
         FIG. 15  is a schematic structural diagram of a switching unit according to an example, showing a first latch member in a second position; 
         FIG. 16  illustrates a structure of detecting a phase of a rotational cam according to an example; 
         FIG. 17  is a perspective view of a structure in which a first latch member and a switching unit are provided in a main body, according to an example; 
         FIG. 18  is an exploded perspective view of the structure in which the first latch member and the switching unit are provided in the main body, illustrated in  FIG. 12 , according to an example; 
         FIG. 19  illustrates an inlet shutter in a blocking position; 
         FIG. 20  illustrates an inlet shutter in an inlet position; 
         FIG. 21  is a schematic perspective view of a toner cartridge according to an example; 
         FIG. 22  is a partial perspective view of a structure of switching a second latch member to a fourth position, according to an example; 
         FIG. 23  is a side view of an inlet shutter, according to an example; 
         FIGS. 24A-24D  are partial perspective views illustrating rotation of an inlet shutter of a toner refilling portion, according to an example; and 
         FIG. 25  is a partial perspective view of a toner refilling portion, according to an example. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to examples, examples of which are illustrated in the accompanying drawings. The same reference numerals are used to denote the same elements, and repeated descriptions thereof will be omitted. 
       FIG. 1  is a schematic perspective view of the exterior of an electrophotographic image forming apparatus according to an example.  FIG. 2  is a schematic structural diagram of the electrophotographic image forming apparatus of  FIG. 1  according to an example.  FIG. 3  is a perspective view of a development cartridge included in the electrophotographic image forming apparatus illustrated in  FIG. 1 , according to an example. 
     Referring to  FIGS. 1, 2, and 3 , the image forming apparatus may include a main body  1  and a development cartridge  2  that is attachable to/detachable from the main body  1 . A door  3  may be provided in the main body  1 . The door  3  opens or closes a portion of the main body  1 . While the door  3  opening an upper portion of the main body  1  is illustrated in  FIG. 1 , a door opening a side portion or a front portion of the main body  1  may be included as needed. The development cartridge  2  may be mounted to or removed from the main body  1  by opening the door  3 . 
     The main body  1  may include a communicating portion  8  such that the development cartridge  2  accesses from outside the main body  1  a toner refilling portion  10  in a state in which the development cartridge  2  is mounted on the main body  1 . The communicating portion  8  may be provided at a position close to a front surface  1 - 2  of the main body  1 . Since the front surface  1 - 2  faces the user, the user may easily access the communication portion  8 . Therefore, a toner refilling operation using a toner refill cartridge  9  may be easily performed through the communicating portion  8 . The communicating portion  8  may be provided on an upper surface  1 - 1  of the main body  1 . The toner refilling portion  10  may be provided under the communicating portion  8 . The communicating portion  8  and the toner refilling portion  10  may be aligned in a vertical direction. The toner refill cartridge  9  may access the toner refilling portion  10  from above the main body  1  through the communicating portion  8 . 
     A photosensitive drum  21  is an example of a photoconductor on which an electrostatic latent image is formed, and may include a cylindrical metal pipe and a photoconductive photosensitive layer formed on an outer circumference of the metal pipe. A charging roller  23  is an example of a charger that charges a surface of the photosensitive drum  21  to have a uniform electric potential. A charge bias voltage is applied to the charging roller  23 . Instead of the charging roller  23 , a corona charger (not shown) may be used. A developing roller  22  supplies toner to an electrostatic latent image formed on a surface of the photosensitive drum  21  to develop the electrostatic latent image. 
     In a two-component developing method in which toner and a carrier are used as a developer, the developing roller  22  may be in the form of a sleeve inside of which a magnet is fixed. The sleeve may be located apart from the photosensitive drum  21  by tens to hundreds of micrometers. The carrier is attached to an outer circumference of the developing roller  22  via a magnetic force of a magnet, and the toner is attached to the carrier via an electrostatic force, thereby forming a magnetic brush including the carrier and the toner on the outer circumference of the developing roller  22 . According to a developing bias applied to the developing roller  22 , only the toner is moved to the electrostatic latent image formed on the photosensitive drum  21 . 
     In a one-component developing method in which toner is used as a developer, the developing roller  22  may be in contact with the photosensitive drum  21 , and may be located apart from the photosensitive drum  21  by tens to hundreds of micrometers. In the example, a one-component contact developing method in which the developing roller  22  and the photosensitive drum  21  contact each other to form a developing nip is used. The developing roller  22  may be in the form of an elastic layer (not shown) formed on an outer circumference of a conductive metal core (not shown). When a developing bias voltage is applied to the developing roller  22 , the toner is moved via the developing nip, to the electrostatic latent image formed on a surface of the photosensitive drum  21  to be attached to the electrostatic latent image. 
     A supplying roller  24  attaches the toner to the developing roller  22 . A supply bias voltage may be applied to the supplying roller  24  to attach the toner to the developing roller  22 . Reference numeral  25  denotes a regulating member regulating a toner amount attached to the surface of the developing roller  22 . The regulating member  25  may be, for example, a regulating blade having a front end that contacts the developing roller  22  at a certain pressure. Reference numeral  26  denotes a cleaning member used to remove residual toner and foreign substances from the surface of the photosensitive drum  21  before charging. The cleaning member  26  may be, for example, a cleaning blade having a front end that contacts the surface of the photosensitive drum  21  at a certain pressure. Hereinafter, foreign substances removed from the surface of the photosensitive drum  21  will be referred to as waste toner. 
     An optical scanner  4  scans light modulated according to image information, onto a surface of the photosensitive drum  21  charged to a uniform electric potential. As the optical scanner  4 , for example, a laser scanning unit (LSU) that scans light radiated from a laser diode onto the photosensitive drum  21  by deflecting the light by using a polygon mirror, in a main scanning direction, may be used. 
     A transfer roller  5  is an example of a transfer unit that is located to face the photosensitive drum  21  to form a transfer nip. A transfer bias voltage used to transfer a toner image developed on the surface of the photosensitive drum  21  to a print medium P is applied to the transfer roller  5 . Instead of the transfer roller  5 , a corona transfer unit may be used. 
     The toner image transferred to a surface of the print medium P via the transfer roller  5  is maintained on the surface of the print medium P due to an electrostatic attractive force. A fusing or fixing unit  6  fuses the toner image on the print medium P by applying heat and pressure to the toner image, thereby forming a permanent print image on the print medium P. 
     Referring to  FIGS. 2 and 3 , the development cartridge  2  according to the example includes a developing portion  210  in which the photosensitive drum  21  and the developing roller  22  are mounted, a waste toner container  220  receiving waste toner removed from the photosensitive drum  21 , and a toner container  230  connected to the developing portion  210  and containing toner. In order to refill toner in the toner container  230 , the development cartridge  2  includes a toner refilling portion  10  connected to the toner container  230 . The toner refilling portion  10  provides an interface with respect to the toner refill cartridge  9  which will be described later and the development cartridge  2 . The development cartridge  2  is an integrated type development cartridge including the developing portion  210 , the waste toner container  220 , the toner container  230 , and the toner refilling portion  10 . 
     A portion of an outer circumference of the photosensitive drum  21  is exposed outside a housing. A transfer nip is formed as the transfer roller  5  contacts an exposed portion of the photosensitive drum  21 . At least one conveying member conveying toner towards the developing roller  22  may be installed in the developing portion  210 . The conveying member may also perform a function of charging toner to a certain electric potential by agitating the toner. 
     The waste toner container  220  is located above the developing portion  210 . The waste toner container  220  is spaced apart from the developing portion  210  in an upward direction to form a light path  250  therebetween. Waste toner removed from the photosensitive drum  21  by using the cleaning member  26  is received in the waste toner container  220 . The waste toner removed from the surface of the photosensitive drum  21  is fed into the waste toner container  220  via a waste toner feeding member  221 ,  222 , and  223 . The shape and number of waste toner feeding members are not limited. An appropriate number of waste toner feeding members may be installed at appropriate locations to distribute waste toner effectively in the waste toner container  220  by considering a volume or shape of the waste toner container  220 . 
     The toner container  230  is connected to the toner refilling portion  10  to receive toner. The toner container  230  is connected to the developing portion  210  via a toner supplier  234  as denoted by a dotted line illustrated in  FIG. 2 . As illustrated in  FIG. 2 , the toner supplier  234  may pass through the waste toner container  220  vertically to be connected to the developing portion  210 . The toner supplier  234  is located outside an effective width of exposed light L such that the toner supplier  234  does not interfere with the exposed light L scanned in a main scanning direction by using the optical scanner  4 . 
     Toner supplying members  231 ,  232 , and  233  used to supply toner to the developing portion  210  through the toner supplier  234  may be installed in the toner container  230 . The shape and number of toner supplying members are not limited. An appropriate number of toner supplying members may be installed at appropriate locations to supply toner effectively to the developing portion  210  by considering a volume or shape of the toner container  230 . The toner supplying member  233  may convey toner in a main scanning direction to transfer the same to the toner supplier  234 . 
     An image forming process according to the above-described configuration will be described briefly. A charge bias is applied to the charging roller  23 , and the photosensitive drum  21  is charged to a uniform electric potential. The optical scanner  4  scans light modulated in accordance with image information, onto the photosensitive drum  21 , thereby forming an electrostatic latent image on a surface of the photosensitive drum  21 . The supplying roller  24  attaches the toner to a surface of the developing roller  22 . The regulating member  25  forms a toner layer having a uniform thickness on the surface of the developing roller  22 . A developing bias voltage is applied to the developing roller  22 . As the developing roller  22  is rotated, toner conveyed to a developing nip is moved and attached to the electrostatic latent image formed on the surface of the photosensitive drum  21  via the developing bias voltage, thereby forming a visible toner image on the surface of the photosensitive drum  21 . The print medium P withdrawn from a loading tray  7  via a pickup roller  71  is fed, via a feeding roller  72 , to the transfer nip where the transfer roller  5  and the photosensitive drum  21  face each other. When a transfer bias voltage is applied to the transfer roller  5 , the toner image is transferred to the print medium P via an electrostatic attractive force. As the toner image transferred to the print medium P receives heat and pressure from the fusing unit  6 , the toner image is fused to the print medium P, thereby completing printing. The print medium P is discharged by using a discharge roller  73 . The toner that is not transferred to the print medium P but remains on the surface of the photosensitive drum  21  is removed by using the cleaning member  26 . 
     As described above, the development cartridge  2  supplies the toner contained in the toner container  230  to the electrostatic latent image formed on the photosensitive drum  21  to form a visible toner image, and is attachable to/detachable from the main body  1 . In addition, the development cartridge  2  includes the toner refilling portion  10  used to refill toner. The toner refilling portion  10  may be integrated with the development cartridge  2  and thus may be attachable to/detachable from the main body  1  together with the development cartridge  2 . According to the image forming apparatus of the example, without removing the development cartridge  2  from the main body  1 , toner may be refilled in the development cartridge  2  while the development cartridge  2  is mounted in the main body  1 . 
       FIG. 4  is a perspective view of an example of the toner refill cartridge  9 .  FIGS. 5A and 5B  are views of the toner refill cartridge  9  accessing the toner refilling portion  10  from outside the main body  1  of the image forming apparatus through the communicating portion  8 .  FIG. 6  is a perspective view of an example of the toner refilling portion  10  equipped with the toner refill cartridge  9 .  FIG. 7  is a view for explaining an electrical connection between a connection interface  96  of the toner refill cartridge  9  and a first connector  146  of the toner refilling portion  10 . 
     Referring to  FIGS. 4 to 7 , the toner refill cartridge  9  may be a syringe toner refill cartridge including a body  91  accommodating toner and having a toner discharge portion  940 , and a plunger  93  which is movably coupled to the body  91  in a longitudinal direction A to push toner out of the body  91 . The toner discharge portion  940  may be provided at a tip portion  91 - 3  of the body  91 . A discharge shutter  95  may selectively open and close the toner discharge portion  940 . A protruding portion  912  partially protruding outwardly may be provided at the tip portion  91 - 3  of the body  91 . 
     The body  91  may include an outer body  91 - 1  and an inner body  91 - 2  located inside the outer body  91 - 1  and accommodating toner. The toner discharge portion  940  is provided in the inner body  91 - 2 . The plunger  93  may be inserted into the inner body  91 - 2  and moved in the longitudinal direction A. The plunger  93  may be moved from an upper position Q 1  to a lower position Q 2 . The discharge shutter  95  may be provided so as to be independently rotatable with respect to the tip portion  91 - 3  of the body  91 . For example, as shown in  FIG. 4 , the discharge shutter  95  may be located in a closed position that blocks the toner discharge portion  940 . Further, the discharge shutter  95  may be located at a discharge position where the discharge shutter  95  is rotated 180 degrees with respect to the body  91  to open the toner discharge portion  940 . The discharge shutter  95  may be rotated with respect to a first rotation axis C 1 . The first rotation axis C 1  may be, for example, a central axis of the cylindrical tip portion  91 - 3 . 
     The toner refill cartridge  9  may include a toner injection completion signal generator  92  used for detecting completion of injection of toner. For example, referring to the example of  FIG. 4 , the toner injection completion signal generator  92  may include a pair of electrodes  921  and  922  provided between the outer body  91 - 1  and the inner body  91 - 2 . The pair of electrodes  921  and  922  may be respectively connected to electrical contacts  961   b  and  961   c . An electrical contact state of the pair of electrodes  921  and  922  may vary depending on a position of the plunger  93 . The electrical contact state of the pair of electrodes  921  and  922  may change from a first state to a second state when the plunger  93  enters the lower position Q 2 . For example, the first state and the second state may be an electrical open state and an electrical short state, respectively, or vice versa. An operating lever  923  movable in the longitudinal direction A may be provided between the outer body  91 - 1  and the inner body  91 - 2  in order to change the electrical contact state of the pair of electrodes  921  and  922 . The plunger  93  may include a pushing protrusion  931  which pushes the operating lever  923  when the plunger  93  enters the lower position Q 2  to bring the pair of electrodes  921  and  922  into contact with or spaced from each other. A hooking member  924  provided on the operating lever  923  may be locked and fixed to a protruding portion formed on the body  91  until the plunger  93  reaches a certain position. 
     A connection interface  96  may be provided at the tip portion  91 - 3  of the body  91 . When the toner refill cartridge  9  is mounted on the toner refilling portion  10 , the connection interface  96  may be electrically connected to the main body  1  to transfer information of the toner refill cartridge  9  to the main body  1 . In the example, the connection interface  96  may be electrically connected to the main body  1  via the first connector  146  provided in the toner refilling portion  10 . The main body  1 , for example, a controller provided in the main body  1 , may determine whether or not the toner refill cartridge  9  is mounted depending on whether the controller is electrically connected to the connection interface  96 , for example, whether the controller can communicate with the connection interface  96 . 
     The connection interface  96  may include a circuit unit  962  for managing information of the toner refill cartridge  9  and an electrical contact portion  961  for connection with the main body  1 . The circuit unit  962  may be a customer replaceable unit monitor (CRUM) including a processor for performing at least one of authentication and/or encrypted data communication with the main body  1 . The circuit unit  962  may further include a memory. The memory may store various types of information for the toner refill cartridge  9 . For example, information about a manufacturer, information about manufacturing date and time, unique information such as serial number, model name, and the like, various programs, digital signature information, and a usage state (e.g., how many sheets have been printed so far, how many remaining sheets can be printed, and how much toner is remaining) may be stored in the memory. In addition, information about a lifetime of the toner refill cartridge  9 , setup menu, and the like may be stored in the memory. In addition, the circuit unit  962  may include functional blocks capable of performing various functions for communication authentication, encryption, and the like with the main body  1 . The circuit unit  962  may be implemented in the form of a chip including a processor and/or a memory, or a printed circuit board assembly (PBA) in which circuit elements for implementing chips and various functional blocks are mounted. 
     The electrical contact portion  961  may have various forms such as a conductive pattern, a modular jack, a resilient terminal, and the like, which may be electrically connected to the main body  1 . The electrical contact portion  961  of the example shown in  FIG. 4  is a conductive pattern. The electrical contact portion  961  may be exposed to outside the body  91  through an opening  912 - 1  provided in the protruding portion  912 . 
     For example, the electrical contact portion  961  may have three electrical contacts  961   a ,  961   b , and  961   c . The first electrical contact  961   a  may be for transmitting information stored in the memory of the circuit unit  962  to the main body  1  of the image forming apparatus. The second electrical contact  961   b  may be for transmitting a signal regarding whether or not the toner refill cartridge  9  is mounted on the toner refilling portion  10  to the main body  1  of the image forming apparatus. The third electrical contact  961   c  may be for transmitting a toner injection completion signal or a removal request signal of the toner refill cartridge  9  to the main body  1  of the image forming apparatus. 
     As shown in  FIGS. 5A and 5B , the toner refill cartridge  9  may be mounted on the toner refilling portion  10  through the communicating portion  8  from the outer surface of the main body  1  of the image forming apparatus.  FIG. 5A  is a front view of the toner refill cartridge  9  when the toner refill cartridge  9  accesses the communicating portion  8 .  FIG. 5B  is a rear view of the toner refill cartridge  9  when the toner refill cartridge  9  accesses the communicating portion  8 . When the toner refill cartridge  9  is inserted into the communicating portion  8  from above the main body  1 , the toner refill cartridge  9  may be mounted on the toner refilling portion  10  as shown in  FIG. 6 . When the plunger  93  of the toner refill cartridge  9  is pushed in the longitudinal direction A of the body  91  in a state in which the toner refill cartridge  9  is mounted on the toner refilling portion  10 , toner accommodated in the body  91  may be discharged through the toner discharge portion  940  and supplied to the toner container portion  230  of the development cartridge  2  through the toner refilling portion  10 . The toner refill cartridge  9  may be removed from the communicating portion  8  after completion of the toner injection. 
     According to this configuration, as toner is refilled in the toner container  230  by using the toner refilling portion  10 , a replacement time of the development cartridge  2  may be extended until the lifetime of the photosensitive drum  21  ends, thereby reducing printing costs per sheet. In addition, toner may be refilled while the development cartridge  2  is mounted in the main body  1 , and thus, user convenience may be increased. 
     When the toner refill cartridge  9  is mounted on the toner refilling portion  10  of the image forming apparatus, the connection interface  96  of the toner refill cartridge  9  may be electrically connected to the first connector  146  located at a certain portion of the toner refilling portion  10 . The connection interface  96  of the toner refill cartridge  9  may be electrically connected to the main body  1 , for example, a controller  300  provided in the main body  1  through the first connector  146  and a second connector  127  provided in the toner refilling portion  10 . When the toner refill cartridge  9  is mounted on a mounting portion  11  through the insertion portion of an upper body  13 , the first connector  146  may be directly connected to the electrical contact portion  961  of the connection interface  96 . The first connector  146  may be connected to the second connector  127  by a flexible cable and the second connector  127  may be electrically connected to a controller  300  provided on the main body  1 . 
     Referring to  FIGS. 6 and 7 , the electrical contact portion  961  including the three electrical contacts  961   a ,  961   b , and  961   c  may be provided on a front surface of the connection interface  96  and the circuit unit  962  including a memory for storing information about the toner refill cartridge  9  may be implemented on a rear surface of the connection interface  96 . The first connector  146  may include four electrical contacts  146   a ,  146   b ,  146   c , and  146   d . However, the disclosure is not so limited and there may be more or less than four electrical contacts. The four electrical contacts  146   a ,  146   b ,  146   c , and  146   d  of the first connector  146  may correspond to the three electrical contacts  961   a ,  961   b , and  961   c  of the connection interface  96 . For example, the first electrical contact  961   a  of the connection interface  96  may be electrically connected to the first electrical contact  146   a  of the first connector  146 . The electrical contact  961   b  of the connection interface  96  may be electrically connected to the second electrical contact  146   b  and/or the third electrical contact  146   c  of the first connector  146 . The third electrical contact  961   c  of the connection interface  96  may be electrically connected to the fourth electrical contact  146   d  of the first connector  146 . The four electrical contacts  146   a ,  146   b ,  146   c , and  146   d  may be electrically connected to the mounting portion  11 , for example, the second connector  127  provided on a lower body  12  of the toner refilling portion  10 , by a flexible cable. Thus, a stable electrical connection between the first connector  146  and the second connector  127  may be maintained. The second connector  127  may include an electrical contact portion  126 , and the electrical contact portion  126  may include four electrical contacts  126   a ,  126   b ,  126   c , and  126   d . The four electrical contacts  146   a ,  146   b ,  146   c , and  146   d  of the first connector  146  may be electrically connected to the four electrical contacts  126   a ,  126   b ,  126   c , and  126   d  of the second connector  127  by a flexible cable, respectively. As a result, when the toner refill cartridge  9  is mounted on the mounting portion  11 , the second connector  127  may be electrically connected to the connection interface  96  of the toner refill cartridge  9  through the first connector  146  of the toner refilling portion  10 . 
       FIG. 8  is a view for explaining a connection structure between the toner refill cartridge  9 , the toner refilling portion  10  in the development cartridge  2 , and a controller  300 .  FIG. 9  is a view for explaining information transmission between the toner refill cartridge  9 , the toner refilling portion  10 , and the controller  300  when the toner refill cartridge  9  is mounted on the toner refilling portion  10  in the development cartridge  2 . 
     Referring to  FIGS. 8 and 9 , the connection structure and operation between an image forming apparatus and the toner refill cartridge  9  connected to the main body  1  of the image forming apparatus through an interface between the development cartridge  2  and the main body  1  can be seen. The development cartridge  2  and the toner refill cartridge  9  are consumables removable from the image forming apparatus, and the toner refilling portion  10  in the development cartridge  2  may utilize the same interface as that of the development cartridge  2  to connect the development cartridge  2  and the toner refill cartridge  9  to the main body  1  of the image forming apparatus. 
     The image forming apparatus may include the main body  1 , the development cartridge  2  removable from the main body  1 , the toner refilling portion  10  in the development cartridge  2 , and the controller  300 . The development cartridge  2  supplies toner accommodated in the toner container portion  230  to an electrostatic latent image formed on a photoconductor to form a toner image, the development cartridge  2  being removable from the main body  1 . The toner refilling portion  10  may be in the development cartridge  2 , and the toner refill cartridge  9  for refilling toner in the toner container portion  230  may be mounted on the toner refilling portion  10 . The controller  300  may control operations of the image forming apparatus based on a connection between the development cartridge  2  mounted on the main body  1  and the toner refill cartridge  9  mounted on the toner refilling portion  10 . The toner refilling portion  10  may connect the toner refill cartridge  9  mounted on the toner refilling portion  10  to the main body  1  through the interface between the development cartridge  2  and the main body  1 . The toner refilling portion  10  may be formed integrally with the development cartridge  2 . 
     The toner refilling portion  10  may include the first connector  146  electrically connected to the toner refill cartridge  9  mounted on the toner refilling portion  10  and the second connector  127  electrically connected to the controller  300  provided in the main body  1 . The second connector  127  includes a circuit unit  128  for managing information about the development cartridge  2  and may transmit information about the toner refill cartridge  9  obtained through the first connector  146  and information about the development cartridge  2  obtained from the circuit unit  128  to the controller  300 . 
     As shown in  FIG. 8 , the first connector  146  and the second connector  127  may be connected to each other by a flexible flat cable. The first connector  146  and the second connector  127  connected by the flexible flat cable may be provided as an integrated assembly in the toner refilling portion in the toner refilling portion  10 . The circuit unit  128  may be arranged on a surface opposite to a contact surface of the second connector  127  on which the electrical contact portion  126  electrically connected to the main body  1  is provided. The four electrical contacts  146   a ,  146   b ,  146   c , and  146   d  provided in the first connector  146  may be connected to the four electrical contacts  126   a ,  126   b ,  126   c , and  126   d  provided in the second connector  127 , respectively. 
     The toner refilling portion  10  may be electrically connected to the toner refill cartridge  9  mounted on the toner refilling portion  10  and the main body  1  and may transmit the information about the toner refill cartridge  9  and the information about the development cartridge  2  to the controller  300  through the interface between the development cartridge  2  and the main body  1 . The information about the toner refill cartridge  9  may include information for authentication of the toner refill cartridge  9  and the information about the development cartridge  2  may include information for authentication of the development cartridge  2 . 
     The controller  300  may be connected to the toner refill cartridge  9  through the second connector  127  provided in the toner refilling portion  10  and the first connector  146 . The controller  300  may control operations of the image forming apparatus based on signals or information received through the plurality of electrical contacts  126   a ,  126   b ,  126   c , and  126   d  provided in the second connector  127 . 
     Referring to  FIGS. 8 and 9 , the image forming apparatus may have an electrical structure for detecting whether the toner refill cartridge  9  is mounted on the toner refilling portion  10 . For example, the first connector  146  of the toner refilling portion  10  may include the electrical contact  146   c  electrically connected to the electrical contact  961   b  provided in the connection interface  96  of the toner refill cartridge  9  when the toner refill cartridge  9  is mounted on the mounting portion  11  of the toner refilling portion  10 , and the electrical contact  146   c  of the first connector  146  may be connected to the controller  300  through the electrical contact  126   c  of the second connector  127 . The controller  300  may detect whether the electrical contact  961   b  of the connection interface  96  is electrically connected to the electrical contact  146   c  of the first connector  146  and the electrical contact  126   c  of the second connector  127 , thereby detecting whether or not the toner refill cartridge  9  has been mounted on the toner refilling portion  10 . For example, when the toner refill cartridge  9  is mounted on the toner refilling portion  10 , the electrical contact  961   b  of the connection interface  96  may be electrically connected to the electrical contact  126   c  of the second connector  127  through the electrical contact  146   c  of the first connector  146 . 
     Whether or not the toner refill cartridge  9  is mounted on the toner refilling portion  10 , that is, whether or not the connection interface  96  is connected to the first connector  146  may be determined by a circuit including a reference voltage VDD and two resistors R 1  and R 3 . For example, when the toner refill cartridge  9  is not mounted on the toner refilling portion  10 , no current flows through a circuit passing through the electrical contact  126   c  of the second connector  127 , so that the reference voltage VDD, for example, 3.3 V, is applied to a first input port of the controller  300  connected to the electrical contact  126   c  of the second connector  127 . Meanwhile, when the toner refill cartridge  9  is mounted on the toner refilling portion  10 , the circuit passing through the electrical contact  126   c  of the second connector  127  may be a circuit in which the resistor R 1  and the resistor R 3  are connected in parallel to each other. When resistance values of the resistors R 1  and R 3  are identical, for example, a voltage of 1.65 V may be applied to the first input port of the controller  300 . In other words, the controller  300  may detect whether or not the toner refill cartridge  9  is mounted on the toner refilling portion  10  based on a change in a voltage flowing through the second connector  127  depending on whether the toner refill cartridge  9  is mounted on the toner refilling portion  10  with respect to the reference voltage VDD applied to the controller  300 , and may control the image forming apparatus according to a result of the detection. 
       FIG. 10  is a block diagram of an image forming apparatus  1000 , according to an example. The image forming apparatus  1000  may include some or all of the features shown in the image forming apparatus illustrated in  FIG. 2 . With reference to  FIG. 10 , the image forming apparatus  1000  may also include a user interface  1010  which provides a user with information regarding whether the toner refill cartridge  9  is mounted on the toner refilling portion  10 . The user interface  1010  may include, for example, a keyboard (e.g., a physical keyboard, virtual keyboard, etc.), a button, a switch, a gesture recognition sensor (e.g., to recognize gestures of a user including movements of a body part), an input sound device or voice recognition sensor (e.g., a microphone to receive a voice command), a track ball, and the like. The user interface  1010  may further include a haptic device to provide haptic feedback to a user. The user interface  1010  may also include a touchscreen, for example. The information regarding whether the toner refill cartridge  9  is mounted on the toner refilling portion  10  may be output in the form of a message presented on a screen of the user interface  1010 , by providing a light indication, such as a green light indicating successful mounting of the toner refill cartridge  9  or a red light indicating an unsuccessful mounting of the toner refill cartridge  9 . Further the output may be in the form of haptic feedback presented through the user interface  1010 . The image forming apparatus  1000  may also include an output device  1020  such as a speaker, which may also provide a user information regarding whether the toner refill cartridge  9  is mounted on the toner refilling portion  10 . The speaker may indicate a successful or unsuccessful mounting of the toner refill cartridge  9  by playing a message or by outputting a sound indicating the mounting status of the toner refill cartridge  9  on the toner refilling portion  10 . By providing such information to a user, the user can know whether the toner refill cartridge  9  is successfully or unsuccessfully mounted to the toner refilling portion  10 . When the user knows the toner refill cartridge  9  is successfully mounted to the toner refilling portion  10 , the user can perform a plunging operation to successfully discharge the toner from the toner refill cartridge  9 . When the user is made aware that the toner refill cartridge  9  is unsuccessfully mounted to the toner refilling portion  10 , the user can avoid an erroneous operation such as attempting to perform a plunging operation which cannot successfully be performed due to the toner discharging portion  940  not being aligned with a toner inlet portion  120  of the toner refilling portion  10 . 
     When the toner refill cartridge  9  is mounted on the toner refilling portion  10 , the circuit unit  962  provided in the connection interface  96  of the toner refill cartridge  9  may be connected to a data input port of the controller  300  through the electrical contact  961   a  of the connection interface  96 , the electrical contact  146   a  of the first connector  146 , and the electrical contact  126   a  of the second connector  127 . The controller  300  may read information about the toner refill cartridge  9  from the circuit unit  962  provided in the connection interface  96  of the toner refill cartridge  9 . The information about the toner refill cartridge  9  may include information for authentication of the toner refill cartridge  9 . Meanwhile, when the development cartridge  2  is mounted on the main body  1  of the image forming apparatus, the circuit unit  128  provided in the second connector  127  of the toner refilling portion  10  may be connected to the data input port of the controller  300  through the electrical contact  126   a  of the second connector  127 . The controller  300  may read information about the development cartridge  2  from the circuit unit  128  provided in the second connector  127  of the toner refilling portion  10 . The information about the development cartridge  2  may include information for authentication of the development cartridge  2 . Therefore, the controller  300  may receive the information about the toner refill cartridge  9  and the information about the development cartridge  2  through the interface between the development cartridge  2  and the main body  1 . 
     Meanwhile, the toner refilling portion  10  may include a rotation detection sensor  148  for detecting that the toner refill cartridge  9  mounted on the toner refilling portion  10  enters a certain position depending on the rotation of the toner refill cartridge  9 . The rotation detecting sensor  148  may include a pair of electrodes  148 - 1  and  148 - 2  whose electrical connection state changes depending on a result of the rotation detection of the toner refill cartridge  9 . The toner refilling portion  10  may transmit whether or not the mounted toner refill cartridge  9  has reached a certain position by rotation to the controller  300  through the second connector  127 , based on a result of the detection of the toner refill cartridge  9 . For example, the toner refilling portion  10  may transmit a signal indicating that the toner refill cartridge  9  is successfully mounted to the toner refilling portion  10  and that the toner refilling portion  10  is ready to receive toner from the toner refill cartridge  9  when the toner refill cartridge  9  is rotated by a predetermined amount, for example, 180 degrees or 90 degrees. For example, the toner refilling portion  10  may transmit another signal indicating that the toner refill cartridge  9  is not successfully mounted to the toner refilling portion  10  when the toner refill cartridge  9  has not been rotated by the predetermined amount, for example, 180 degrees or 90 degrees. However, the degree of rotation corresponding to the predetermined amount is not limited to 180 degrees or 90 degrees and may be different than 180 degrees or 90 degrees. 
     For example, the rotation detection sensor  148  may change an electrical contact state of the pair of electrodes  148 - 1  and  148 - 2  when an inlet shutter  14  (see  FIG. 11 ) provided in the mounting portion  11  of the toner refilling portion  10  enters a certain position as the inlet shutter rotates in conjunction with the rotation of the toner refill cartridge  9 . One of the pair of electrodes  148 - 1  and  148 - 2  may be a fixed electrode and the other electrode may be an elastic electrode that can be elastically contacted/separated to/from the fixed electrode. The pair of electrodes  148 - 1  and  148 - 2  may be connected to the controller  300  through the electrical contact  126   c  provided in the second connector  127 . The electrical contact state of the pair of electrodes  148 - 1  and  148 - 2  may change from a first state to a second state when the inlet shutter  14  rotating in conjunction with the rotation of the toner refill cartridge  9  mounted on the toner refilling portion  10  enters a certain position, for example the inlet position which to be further described later. The first state and the second state may be an electrical open state and an electrical short state, respectively, or vice versa. For example, the toner refilling portion  10  may transmit a signal indicating that the toner refill cartridge  9  is successfully mounted to the toner refilling portion  10  and ready to receiver toner from the toner refill cartridge  9  when the inlet shutter  14  is rotated by a predetermined amount, for example, 180 degrees or 90 degrees, to the inlet position. For example, the toner refilling portion  10  may transmit another signal indicating that the toner refill cartridge  9  is not successfully mounted to the toner refilling portion  10  when the inlet shutter  14  has not been rotated by the predetermined amount. However, the degree of rotation is not limited to 180 degrees or 90 degrees and may be different than 180 degrees or 90 degrees. 
     As described above, when a reference voltage applied to the controller  300  is 3.3 V and resistance values of the resistors R 1  and R 3  are identical and when the toner refill cartridge  9  is mounted on the toner refilling portion  10 , a voltage of 1.65 V may be applied to the controller  300  by the voltage flowing through the second connector  127 . Here, when the toner refill cartridge  9  mounted on the toner refilling portion  10  rotates, the electrical contact state of the pair of electrodes  148 - 1  and  148 - 2  provided in the toner refilling portion  10  is changed from the electrical open state to the electrical short state and a voltage of 0 V may be applied to the first input port of the controller  300 . Accordingly, the controller  300  may detect whether or not the toner refill cartridge  9  rotates based on the change in the voltage flowing through the second connector  127  depending on the rotation of the toner refill cartridge  9  with respect to the reference voltage VDD applied to the controller  300 , and may control the image forming apparatus according to a result of the detection. 
     For example, the image forming apparatus  1000  may be controlled to output information regarding whether the toner refill cartridge  9  is mounted on the toner refilling portion  10 . For example, a message may be presented on a screen of the user interface  1010  regarding a status of rotation or mounting of the toner refill cartridge  9 , or a light indication may be provided, such as a green light indicating successful mounting of the toner refill cartridge  9  or a red light indicating an unsuccessful mounting of the toner refill cartridge  9 . Further the output may be in the form of haptic feedback presented through the user interface  1010 , or a sound generated by an output device  1020  such as a speaker, which may also provide a user information regarding whether the toner refill cartridge  9  is mounted on the toner refilling portion  10 . 
     When the toner refill cartridge  9  is rotated to allow toner contained in the toner refill cartridge  9  to be injected into the toner container portion  230  of the image forming apparatus, a user may push the plunger  93  to refill toner into the toner container portion  230  through the toner refilling portion  10 . Completion of the toner injection may be detected by the toner injection completion signal generator  92 . When the plunger  93  enters the lower position Q 2 , the pushing protrusion  931  may push the operating lever  923  to bring the pair of electrodes  921  and  922  into contact with each other. One of the pair of electrodes  921  and  922  may be a fixed electrode and the other electrode may be an elastic electrode that can be elastically contacted/separated to/from the fixed electrode. Accordingly, 0 V may be applied to a second input port of the controller  300  to which the reference voltage of 3.3 V is applied until toner injection is completed. That is, 0 V may be applied to both the first input port and the second input port of the controller  300 . Accordingly, the controller  300  may detect toner injection completion of the toner refill cartridge  9  based on the change in the voltage flowing through the second connector  127  depending on whether or not the toner injection of the toner refill cartridge  9  is completed with respect to the reference voltage VDD applied to the controller  300 , and may control the image forming apparatus according to a result of the detection. 
     In order to remove the toner refill cartridge  9 , the toner refill cartridge  9  may be rotated in a direction opposite to a direction in which the toner refill cartridge  9  is rotated after being mounted on the toner refilling portion  10 . Accordingly, the inlet shutter  14  rotated together with the rotation of the toner refill cartridge  9  may be returned to its original position. A voltage of 1.65 V instead a voltage of 0 V may be applied to the first input port of the controller  300  again. When the toner injection of the toner refill cartridge  9  is completed and the toner refill cartridge  9  is unlocked by rotating the toner refill cartridge  9  in a direction opposite to a direction in which the toner refill cartridge  9  is rotated after being mounted on the toner refilling portion  10 , a user may separate the toner refill cartridge  9  from the toner refilling portion  10 . Accordingly, a signal of 3.3 V may be input to the first input port of the controller  300  again. 
     The image forming apparatus  1000  may be controlled to output information regarding the toner refill cartridge  9  being separated from the toner refilling portion  10 . For example, a message may be presented on a screen of the user interface  1010  regarding a status of rotation or separation of the toner refill cartridge  9 , or a light indication may be provided. Further the output may be in the form of haptic feedback presented through the user interface  1010 , or a sound generated by an output device  1020  such as a speaker, which may also provide a user information regarding separation of the toner refill cartridge  9  from the toner refilling portion  10 . The user interface  1010  and output device  1020  may be combined as a single device where the user interface  1010  includes the output device  1020  or vice versa. 
       FIG. 11  is an exploded perspective view of the toner refilling portion  10  according to an example.  FIG. 12  illustrates an inlet shutter  14  located in a blocking position.  FIG. 13  illustrates the inlet shutter  14  located in an inlet position. In  FIGS. 12 and 13 , an upper body  13  is omitted. 
     Referring to  FIGS. 6 and 11 , the toner refilling portion  10  may include a mounting portion  11  in which the toner refill cartridge  9  is mounted, a toner inlet portion  120 , and the inlet shutter  14 . 
     The mounting portion  11  is connected to the toner container  230 . The toner refill cartridge  9  that is inserted from outside the mounting portion  11  through the communicating portion  8  is mounted in the mounting portion  11 . The toner inlet portion  120  is provided in the mounting portion  11  to receive toner from the toner cartridge  9 . For example, the mounting portion  11  may include a lower body  12  and an upper body  13 . The upper body  13  is coupled to the lower body  12 . The lower body  12  is connected to the toner container  230 . The toner inlet portion  120  is provided in the lower body  12 . 
     The inlet shutter  14  is provided in the mounting portion  11  such that it is switchable between a blocking position ( FIG. 12 ) where the toner inlet portion  120  is blocked and an inlet position ( FIG. 13 ) where the toner inlet portion  120  is opened. The inlet shutter  14  may be rotated about the first rotational axis C 1  to be switched between the blocking position and the inlet position. For example, the inlet shutter  14  may include a blocking portion  140 . The inlet shutter  14  may be provided in the mounting portion  11  such that the inlet shutter  14  is rotatable about the first rotational axis C 1  between the blocking position ( FIG. 12 ) where the blocking portion  140  blocks the toner inlet portion  120  and the inlet position ( FIG. 13 ) where the blocking portion  140  is offset from the toner inlet portion  120  to open the toner inlet portion  120 . 
     For example, the inlet shutter  14  may be located between the lower body  12  and the upper body  13 . The inlet shutter  14  may be rotatably supported by the lower body  12 . A first cylindrical portion  122  that rotatably supports the inlet shutter  14  about the first rotational axis C 1  is provided in the lower body  12 . The first cylindrical portion  122  may be implemented using, for example, a cylindrical rib arranged about the first rotational axis C 1  and protruding toward the upper body  13 . The inlet shutter  14  includes a second cylindrical portion  142  surrounding the first cylindrical portion  122  and being rotatably supported by the first cylindrical portion  122 . The upper body  13  is coupled to the lower body  12  to cover the inlet shutter  14 . 
     The inlet shutter  14  includes a receiving portion  143  receiving the front end portion of the toner cartridge  9 . The inlet shutter  14  has a shape that is rotatable with the toner refill cartridge  9  when the toner refill cartridge  9  is rotated about the first rotational axis C 1 . For example, a shape of the front end portion of the toner refill cartridge  9  may be complementary to a shape of the blocking portion  140 . A groove  143 - 1  that is partially opened and protrudes outwardly to receive a protruding portion  912  of the toner refill cartridge  9  may be formed in the receiving portion  143 . An insertion portion  135  and a key groove  135 - 1  that are respectively aligned with the receiving portion  143  and the groove  143 - 1  may be provided in the upper body  13 . The receiving portion  143 , the groove  143 - 1 , the insertion portion  135 , and the key groove  135 - 1  are aligned with each other when the inlet shutter  14  is located in the blocking position. 
     For example, as illustrated in  FIG. 12 , by aligning the protruding portion  912  with the key groove  135 - 1  while the inlet shutter  14  is in the blocking position, the toner refill cartridge  9  may be mounted in the mounting portion  11 . Then the front end portion of the body  91  is received in the receiving portion  143  of the inlet shutter  14 , and the protruding portion  912  is received in the groove  143 - 1 , and the front end portion of the toner refill cartridge  9  and the blocking portion  140  are coupled to each other in a complementary manner. The blocking portion  140  covers the toner inlet portion  120 . The toner discharging portion  940  of the toner refill cartridge  9  is located in an offset position from the toner inlet portion  120 . The toner discharging portion  940  is blocked by the discharge shutter  95  illustrated in  FIG. 4 . 
     In this state, when the toner refill cartridge  9  is rotated about the first rotational axis C 1 , the inlet shutter  14  is rotated with the toner cartridge  9 . Accordingly, the inlet shutter  14  may be rotated between the blocking position and the inlet position. When the toner refill cartridge  9  is rotated about the first rotational axis C 1  such that the inlet shutter  14  deviates from the blocking position, the protruding portion  912  is located in a lower portion of a boundary of the insertion portion  135  of the upper body  13 . In this state, even when attempting to forcibly separate the toner refill cartridge  9  from the mounting portion  11 , since the protruding portion  912  is caught by the insertion portion  135 , the toner refill cartridge  9  is not separated. 
     When the toner refill cartridge  9  is rotated about the first rotational axis C 1  by 180 degrees, as illustrated in  FIG. 13 , the inlet shutter  14  is in the inlet position, and the blocking portion  140  is offset from the toner inlet portion  120 , thereby opening the toner inlet portion  120 . The discharge shutter  95  is caught by an outer portion of the toner inlet portion  120  and is thus not rotated, and the body  91 , on the other hand, is rotated with respect to the discharge shutter  95  by, for example, 180 degrees. The toner discharging portion  940  of the toner refill cartridge  9  is opened, and the toner discharging portion  940  is aligned with the toner inlet portion  120 . By pressing the plunger  93  in this state, toner may be supplied from the body  91  to the toner container  230  through the toner discharging portion  940  and the toner inlet portion  120 . 
     The development cartridge  2  according to the example is an integration-type development cartridge  2  in which the toner refilling portion  10  is integrated, as illustrated in  FIG. 3 . The development cartridge  2  may be distributed during the product distribution stage while being mounted in the main body  1 . The development cartridge  2  is a consumable item that is replaced when the life of the development cartridge  2  ends, and may be distributed separately from the main body  1 . When the toner inlet portion  120  is opened in a distribution stage, toner contained in the toner container  230  may leak out. The leaked toner may contaminate the toner refilling portion  10 . When the toner inlet portion  120  is opened during the distribution stage where the development cartridge  2  is distributed while being mounted in the main body  1 , the inside of the main body  1  may be contaminated by the leaked toner. 
     Considering this, the image forming apparatus according to an example includes a first latch member  16  having a first position where the inlet shutter  14  is locked and a second position where switching or rotation of the inlet shutter  14  is allowed. A switching unit  18 , which will be described later, selectively switches the first latch member  16  between the first position and the second position. In the example, the first latch member  16  is provided in the toner refilling portion  10 , and the switching unit  18  is provided in the main body  1 . 
     Referring to  FIGS. 11, 12 and 13 , the first latch member  16  may be provided in the mounting portion  11  such that the first latch member  16  is switched between the first position and the second position. The first latch member  16  may be moved in a direction of the first rotational axis C 1  to be switched between the first position and the second position. For example, the first latch member  16  may be moved in a longitudinal direction parallel to the direction of the first rotational axis C 1  in an upward and downward fashion. For example, referring to  FIG. 11 , an operation hole  123  extending in a direction of the first rotational axis C 1  may be formed in the lower body  12 . The first latch member  16  may be movably inserted into the operation hole  123  in a direction of the first rotational axis C 1 . A first latch spring  17  applies an elastic force to the first latch member  16  in a direction in which the first latch member  16  is located in the first position. The first latch spring  17  may be in various forms such as a coil spring, a leaf spring, or a resilient arm integrally formed with the first latch member  16 . In the example, the first latch spring  17  may be implemented by a compression coil spring having a first end portion supported by the upper body  13  and a second end portion supported by the first latch member  16 . 
     The first latch member  16  may lock the inlet shutter  14  in the blocking position. A first latching portion  144  is provided in the inlet shutter  14 . The first latching portion  144  may be implemented by a pair of protrusions  144 - 1  and  144 - 2  that protrude outward from an outer circumference of the inlet shutter  14  and are spaced apart from each other in a circumferential direction. The first latch member  16  may include a latching protrusion  161  which is caught by the first latching portion  144  when the first latch member  16  is located in the first position. Referring to  FIG. 12 , when the inlet shutter  14  is located in the blocking position, the latching protrusion  161  of the first latch member  16  located in the first position is caught by the first latching portion  144 , and the inlet shutter  14  is locked in the blocking position. The first latch member  16  may be held in the first position via the first latch spring  17  when the development cartridge  2  is separated from the main body  1 . Thus, during distribution of the development cartridge  2  while being mounted in the main body  1  or apart from the main body  1 , the toner inlet portion  120  may be maintained in a closed state, and thus, toner leakage may be prevented. 
     When the toner refill cartridge  9  is mounted in the mounting portion  11  and is rotated during refilling of toner, the inlet shutter  14  is also rotated so that the toner inlet portion  120  and the toner discharging portion  940  may be offset from each other. Then, the toner discharged through the toner discharging portion  940  may leak out of the toner inlet portion  120  to contaminate the toner refilling portion  10 . 
     Considering this, the first latch member  16  may lock the inlet shutter  14  in the inlet position. Referring to  FIGS. 12 and 13 , a second latching portion  145  is provided on the inlet shutter  14 . The second latching portion  145  may be implemented using a pair of protrusions  145 - 1  and  145 - 2  that protrude outwardly from the outer circumference of the inlet shutter  14  and are spaced apart from each other in a circumferential direction. As illustrated in  FIG. 13 , when the inlet shutter  14  is located in the inlet position, the latching protrusion  161  of the first latch member  16  located in the first position is caught by the second latching portion  145 , and the inlet shutter  14  is locked in the inlet position. Accordingly, while the toner refill cartridge  9  is mounted in the mounting portion  11  and toner is being refilled, the inlet shutter  14  is not rotated, and the toner may be stably refilled in the toner container  230  without toner leakage. 
     The switching unit  18  selectively switches the first latch member  16  between the first position and the second position. For example, while the inlet shutter  14  is locked in the blocking position, when the toner refill cartridge  9  is mounted in the toner refilling portion  10 , the switching unit  18  switches the first latch member  16  to the second position so that the inlet shutter  14  and the toner refill cartridge  9  may be rotated together. When the first latch member  16  is located in the second position, the latching protrusion  161  deviates from the first latching portion  144 , and the inlet shutter  14  enters a state where it is rotatable. When the toner refill cartridge  9  is mounted in the toner refilling portion  10  and rotated by 180 degrees, so that the inlet shutter  14  is located in the inlet position, the switching unit  18  may switch the first latch member  16  to the first position. The latching protrusion  161  of the first latch member  16  is caught by the second latching portion  145  and the inlet shutter  14  is locked in the inlet position, and thus the toner refill cartridge  9  and the inlet shutter  14  are not rotated. 
     The switching unit  18  may be implemented in various forms.  FIG. 14  is a schematic structural diagram of the switching unit  18  according to an example, showing the first latch member  16  located in the first position.  FIG. 15  is a schematic structural diagram of the switching unit  18  according to an example, showing the first latch member  16  located in the second position.  FIG. 16  illustrates a structure of detecting a phase of a rotational cam  181  according to an example. In  FIGS. 14 and 15 , portions of the upper body  13  are omitted. 
     Referring to  FIGS. 14 and 15 , the switching unit  18  includes a rotational cam  181  having a cam track  181   a , a motor  182  rotating the rotational cam  181 , and a movable member  183  guided to the cam track  181   a  to switch the first latch member  16  between the first and second positions. The cam track  181   a  may include first and second cam portions  181   a - 1  and  181   a - 2  respectively corresponding to the first and second positions of the first latch member  16 . The movable member  183  may include a first movable member  183 - 1  guided to the cam track  181   a  to be pivoted and a second movable member  183 - 2  connected to the first movable member  183 - 1  to be lifted. When the development cartridge  2  is mounted in the main body  1 , the second movable member  183 - 2  may be inserted into the operation hole  123  in which the first latch member  16  is installed, to thereby contact the first latch member  16 . The cam spring  184  applies an elastic force to the movable member  183  in a direction in which the movable member  183  contacts the cam track  181   a . According to the example, the cam spring  184  is implemented by using a tensile coil spring having a first end portion connected to the first movable member  183 - 1  and a second end portion supported by the main body  1 . The first end portion of the first movable member  183 - 1  is maintained in contact with the cam track  181   a  via the cam spring  184 . The motor  182  may be, for example, a direct current (DC) motor. For example, a worm gear may be mounted on a rotational axis of the motor  182 . A worm wheel with which the worm gear engages may be provided to the rotational cam  181 . When the motor  182  rotates, the rotational cam  181  may be rotated. 
     Referring to  FIG. 16 , the switching unit  18  may further include a sensor  185  detecting a phase of the rotational cam  181 . For example, the sensor  185  may be implemented using a photo-interrupter including a light emitting portion  185 - 1  and a light receiving portion  185 - 2 . A light shielding rib  181   b  blocking light between the light emitting portion  185 - 1  and the light receiving portion  185 - 2  according to a rotational phase may be provided in the rotational cam  181 . For example, when light is blocked via the light shielding rib  181   b  and thus no light is detected from the light receiving portion  185 - 2 , an ON detection signal may be generated in the light receiving portion  185 - 2 ; when light is detected from the light receiving portion  185 - 2 , an OFF detection signal may be generated in the light receiving portion  185 - 2 . For example, when an angle between two ends of the light shielding rib  181   b  is 180 degrees, the movable member  183  may be configured to be guided to the first cam portion  181   a - 1  of the rotational cam  181  in a moment when a detection signal of the light receiving portion  185 - 2  changes from ON to OFF, and the movable member  183  may be configured to be guided to the second cam portion  181   a - 2  of the rotational cam  181  in a moment when a detection signal of the light receiving portion  185 - 2  changes from OFF to ON. According to this configuration, a rotational phase of the rotational cam  181  may be detected, and the first latch member  16  may be positioned in the first position or the second position. 
     The motor  182  is driven in an initial state and stopped a moment when a detection signal of the light receiving portion  185 - 2  changes from ON to OFF. Then the movable member  183  is guided to the first cam portion  181   a - 1 , and the movable member  183  moves away from the first latch member  16 , and accordingly, due to an elastic force of the first latch spring  17 , the first latch member  16  is located in the first position as illustrated in  FIG. 14 . As the latching protrusion  161  of the first latch member  16  is caught by the first latching portion  144  or the second latching portion  145  of the inlet shutter  14 , the inlet shutter  14  is locked in the blocking position or the inlet position. 
     To allow rotation of the inlet shutter  14 , the motor  182  is driven and then stopped a moment when a detection signal of the light receiving portion  185 - 2  changes from OFF to ON. Then the movable member  183  is guided to the second cam portion  181   a - 2 , and the movable member  183  pushes the first latch member  16  in an opposite direction to the elastic force of the first latch spring  17 . Then, as illustrated in  FIG. 15 , the first latch member  16  is located in the second position. As the latching protrusion  161  of the first latch member  16  deviates upwards from the first latching portion  144  or second latching portion  145  of the inlet shutter  14 , the inlet shutter  14  may be rotated from the blocking position to the inlet position or in an opposite direction thereto. 
     The first latch member  16  and the switching unit  18  may also be provided in the main body  1 .  FIG. 17  is a perspective view of a structure in which the first latch member  16  and the switching unit  18  are provided in the main body  1 , according to an example.  FIG. 18  is an exploded perspective view of the structure of  FIG. 17 .  FIG. 19  illustrates the inlet shutter  14  located in the blocking position.  FIG. 20  illustrates the inlet shutter  14  located in the inlet position.  FIG. 21  is a schematic perspective view of the toner refill cartridge  9  according to an example. In  FIGS. 17 and 18 , the toner refilling portion  10 , the first latch member  16 , and the switching unit  18  are illustrated. In  FIGS. 19 and 20 , the upper body  13  is omitted. Elements having an identical function as those described in the above-described examples will be labeled with identical reference numerals. 
     Referring to  FIG. 21 , the toner refill cartridge  9  may be a syringe-type toner refill cartridge including a body  91  containing toner and including a toner discharging portion  940  and a plunger  93  that is movably coupled to the body  91  in a length direction A to pull the toner out of the body  91 . The toner discharging portion  940  may be provided at a front end portion of the body  91 . The toner discharging portion  940  may be eccentrically positioned from the first rotational axis C 1 . The body  91  may be, for example, cylindrical. The first rotational axis C 1  may be a central axis of a cylindrical body  91 . The first rotational axis C 1  may be a rotational central axis about which the toner refill cartridge  9  mounted on the toner refilling portion  10  is rotated. A discharge shutter (not shown) selectively opens or closes the toner discharging portion  940 . When pressing the plunger  93  in direction A while the toner refill cartridge  9  is mounted in the toner refilling portion  10 , the toner may be supplied from the body  91  to the toner container  230  of the development cartridge  2  through the toner refilling portion  10 . 
     Referring to  FIGS. 17, 18, 19, and 20 , the toner refilling portion  10  may include a mounting portion  11  in which the toner refill cartridge  9  is mounted, a toner inlet portion  120 , and an inlet shutter  14 . 
     The mounting portion  11  is connected to the toner container  230 . The toner refill cartridge  9  that is inserted from outside the mounting portion  11  through the communicating portion  8  is mounted in the mounting portion  11 . A toner inlet portion  120  is provided in the mounting portion  11  to receive toner from the toner cartridge  9 . For example, the mounting portion  11  may include a lower body  12  and an upper body  13 . The upper body  13  is coupled to the lower body  12 . The lower body  12  is connected to the toner container  230 . The toner inlet portion  120  is provided in the lower body  12 . 
     The inlet shutter  14  is provided in the mounting portion  11  such that the inlet shutter  14  is switchable between the blocking position ( FIG. 19 ) where the toner inlet portion  120  is blocked and the inlet position ( FIG. 20 ) where the toner inlet portion  120  is opened. The inlet shutter  14  may be rotated about the first rotational axis C 1  between the blocking position and the inlet position. For example, the inlet shutter  14  may include a second toner inlet portion  141 . The inlet shutter  14  may be provided in the mounting portion  11  such that the inlet shutter  14  is rotatable about the first rotational axis C 1  between the blocking position where the toner inlet portion  120  and the second toner inlet portion  141  are offset from each other to block the toner inlet portion  120  and the inlet position where the toner inlet portion  120  and the second toner inlet portion  141  are aligned with each other to open the toner inlet portion  120 . The second toner inlet portion  141  is aligned with the toner discharging portion  940  of the toner cartridge  9 . 
     For example, the inlet shutter  14  may be located between the lower body  12  and the upper body  13 . The inlet shutter  14  may be rotatably supported by the lower body  12 . The lower body  12  has a first cylindrical portion  122  that rotatably supports the inlet shutter  14  about the first rotational axis C 1 . The first cylindrical portion  122  may be, for example, a cylindrical rib arranged about the first rotational axis C 1  and protruding toward the upper body  13 . The inlet shutter  14  is supported by the lower body  12  such that the second cylindrical portion  142  forming an outer circumference of the inlet shutter  14  is located within the first cylindrical portion  122 . The upper body  13  is coupled to the lower body  12  to cover the inlet shutter  14 . 
     The upper body  13  may have a structure in which the toner refill cartridge  9  may be rotatably supported. For example, a receiving portion  132  having a cylindrical shape and receiving the front end portion of the toner refill cartridge  9  may be provided in the upper body  13 . The receiving portion  132  may be, for example, a cylindrical rib arranged about the first rotational axis C 1  and protruding upwardly. When the toner refill cartridge  9  is mounted in the mounting portion  11 , the front end portion of the toner refill cartridge  9  is received in the receiving portion  132 , and the toner discharging portion  940  is inserted into the second toner inlet portion  141  of the inlet shutter  14 . In this state, when the toner refill cartridge  9  is rotated about the first rotational axis C 1 , the inlet shutter  14  is rotated with the toner cartridge  9 . Accordingly, the inlet shutter  14  may be rotated between the blocking position and the inlet position. 
     As illustrated in  FIG. 19 , while the inlet shutter  14  is located in the blocking position, the toner refill cartridge  9  is mounted in the mounting portion  11 . The toner discharging portion  940  is inserted into the second toner inlet portion  141 . As the second toner inlet portion  141  and the toner inlet portion  120  are offset from each other, even when a discharge shutter opens the toner discharging portion  940 , toner does not flow into the toner inlet portion  120 . In this state, when the toner refill cartridge  9  is rotated about the first rotational axis C 1  by 90 degrees, as illustrated in  FIG. 20 , the inlet shutter  14  is in the inlet position, and the second toner inlet portion  141  is aligned with the toner inlet portion  120 , thereby opening the toner inlet portion  120 . When the discharge shutter (not shown) opens the toner discharging portion  940  and presses the plunger  93 , toner may be supplied to the toner container  230  from the body  91  through the toner discharging portion  940 , the second toner inlet portion  141 , and the toner inlet portion  120 . 
     The image forming apparatus according to the example includes the first latch member  16  having a first position where the inlet shutter  14  is locked and a second position where switching of the inlet shutter  14  is allowed. The switching unit  18  selectively switches the first latch member  16  between the first position and the second position. According to the example, the first latch member  16  and the switching unit  18  are provided in the main body  1 . 
     Referring to  FIG. 18 , the first latch member  16  may be moved in a direction of the first rotational axis C 1  to be switched between the first position and the second position. When the development cartridge  2  is mounted in the main body  1 , the first latch member  16  is inserted, for example, into a through hole  124  provided in the lower body  12 . 
     The first latch member  16  may lock the inlet shutter  14  in the blocking position. Referring to  FIGS. 18 and 19 , a first latching portion  144  whereby the first latch member  16  located in the first position is caught when the inlet shutter  14  is located in the blocking position is provided in the inlet shutter  14 . When the inlet shutter  14  is located in the blocking position, the first latching portion  144  is aligned with the first latch member  16 , and when the first latch member  16  is switched to the first position via the switching unit  18  which will be described later, the first latch member  16  may be caught by the first latching portion  144 , thereby locking the inlet shutter  14  in the blocking position. Thus, during distribution of the development cartridge  2  mounted in the main body  1 , the toner inlet portion  120  may be maintained in a closed state, and thus, toner leakage may be prevented. 
     The first latch member  16  may lock the inlet shutter  14  in the inlet position. Referring to  FIGS. 18 and 20 , the second latching portion  145  whereby the first latch member  16  located in the first position is caught when the inlet shutter  14  is located in the inlet position is provided in the inlet shutter  14 . When the inlet shutter  14  is located in the inlet position, the second latching portion  145  is aligned with the first latch member  16 , and when the first latch member  16  is switched to the first position via the switching unit  18  which will be described later, the first latch member  16  may be caught by the second latching portion  145 , thereby locking the inlet shutter  14  in the inlet position. Accordingly, while the toner refill cartridge  9  is mounted in the mounting portion  11  and toner is being refilled, the inlet shutter  14  is not rotated, and the toner may be stably refilled in the toner container  230  without toner leakage. 
     Referring to  FIGS. 17 and 18 , the switching unit  18  may include a solenoid  186  via which the first latch member  16  is switched between the first and second positions. The solenoid  186  may include a solenoid body  186 - 1  and a driving shaft  186 - 2 . The first latch member  16  is connected to the driving shaft  186 - 2 . A first latch spring  17  applies an elastic force to the first latch member  16  in a direction in which the first latch member  16  is located in the first position. According to the example, the first latch spring  17  is implemented by a compression coil spring interposed between the driving shaft  186 - 2  and the solenoid body  186 - 1 . The first latch spring  17  applies an elastic force to the driving shaft  186 - 2  in a direction in which the first latch member  16  is located in the first position. That is, the first latch spring  17  pushes the driving shaft  186 - 2  towards the first latch member  16 . 
     When a current is supplied to the solenoid body  186 - 1 , the driving shaft  186 - 2  is pulled in an opposite direction of the elastic force of the first latch spring  17 , that is, toward the solenoid body  186 - 1 . The first latch member  16  is moved from the first position to the second position. When no current is applied to the solenoid body  186 - 1 , the driving shaft  186 - 2  is pushed toward the first latch member  16  due to the elastic force of the first latch spring  17  and the first latch member  16  is moved from the second position to the first position. 
     As described above, according to the switching unit  18  including the solenoid  186 , by supplying or blocking a current to or from the solenoid  186 , the first latch member  16  may be switched between the second position and the first position. 
     Referring back to  FIG. 18 , a third latching portion  147  may be provided in the inlet shutter  14 . A second latch member  19  has a third position where the second latch member  19  is caught by the third latching portion  147  when the inlet shutter  14  is located in the blocking position to lock the inlet shutter  14  and a fourth position where the second latch member  19  is released from the third latching portion  147 . For example, the second latch member  19  may be liftably mounted in a direction of the first rotational axis C 1  in the operation hole  125  of the lower body  12  that extends in a direction of the first rotational axis C 1 . The third latching portion  147  may be concavely formed in an upward direction from a lower surface of the inlet shutter  14 . A latching portion  191  that is caught by the third latching portion  147  when the second latch member  19  is located in the third position is formed on the second latch member  19 . A second latch spring  20  applies an elastic force to the second latch member  19  in a direction in which the second latch member  19  is located in the third position. Thus, when the development cartridge  2  is separated from the main body  1 , the second latch member  19  may be maintained in the third position. 
     When the first latch member  16  and the switching unit  18  are provided in the main body  1 , and when the development cartridge  2  is separated from the main body  1 , the inlet shutter  14  may not be locked in the blocking position. In addition, also when the development cartridge  2  is distributed separately from the main body  1 , the inlet shutter  14  may not be locked in the blocking position. According to the example, when the development cartridge  2  is separated from the main body  1 , the inlet shutter  14  may be locked in the blocking position via the second latch member  19 . 
     When the development cartridge  2  is mounted in the main body  1 , the second latch member  19  is switched to the fourth position. Switching of the second latch member  19  to the fourth position may be performed in conjunction with a closing operation of the door  3 .  FIG. 22  is a partial perspective view of a structure of switching the second latch member  19  to the fourth position, according to an example. Referring to  FIGS. 17, 18, and 22 , the second latch member  19  protrudes upwardly from the upper body  13  through a through hole  136  formed in the upper body  13 . The door  3  is provided in the main body  1  to open or close a portion of the main body  1  to attach/detach the development cartridge  2  to/from the main body  1 . According to the example, the door  3  partially opens an upper portion of the main body  1 . A releasing member  31  that switches the second latch member  19  to the fourth position via a closing operation of the door  3  is provided in the door  3 . For example, the releasing member  31  may be protruded from an inner surface of the door  3  and press the second latch member  19  in an opposite direction to the elastic force of the second latch spring  20  when the door  3  is closed, thereby switching the second latch member  19  to the fourth position. By opening the door  3 , the releasing member  31  is spaced apart from the second latch member  19 , and the second latch member  19  may return from the fourth position to the third position via the elastic force of the second latch spring  20  and be maintained in the third position. 
     According to this configuration, when the development cartridge  2  is separated from the main body  1 , the inlet shutter  14  may be locked in the blocking position via the second latch member  19 . As the development cartridge  2  is mounted in the main body  1 , the releasing member  31  presses the second latch member  19  via a closing operation of the development cartridge  2 , thereby switching the second latch member  19  to the fourth position. Accordingly, according to operation of the first latch member  16  and the switching unit  18 , the inlet shutter  14  may be locked in the blocking position or the inlet position, and rotated from the blocking position to the inlet shutter  14  or in an opposite direction thereto. 
     Referring now to  FIG. 23 , a side view of an inlet shutter according to an example is illustrated. As shown in  FIG. 23 , the inlet shutter  14  may further include a shutter protrusion  150  provided on a surface of the inlet shutter to, while the inlet shutter  14  is rotated, contact an object and cause feedback indicating whether the inlet shutter  14  is rotated to a predetermined position, for example, the inlet position. The shutter protrusion  150  may be provided at a lower portion of the outer circumferential surface of the inlet shutter.  14 . As illustrated in  FIG. 23 , the shutter protrusion  150  may have a ramp or wedge shape including a first portion  151  inclined at a first angle, a second portion  152  inclined at a second angle, and a third portion  153  inclined at a third angle. The shutter protrusion  150  may further include a fourth portion  154  which is flat. The shutter protrusion  150  may be attached to the outer circumferential surface of the inlet shutter  14  and may be formed such that an inner side facing the outer circumferential surface of the inlet shutter  14  conforms to the cylindrical shape of the inlet shutter  14  and closely adheres to the inlet shutter  14 . The shutter protrusion  150  may be integrally formed together with the inlet shutter  14 , or may be attached to the inlet shutter  14  by a fixing member such as an adhesive or by a screw, for example. The disclosure is not limited to the shutter protrusion  150  illustrated in  FIG. 23  and the shutter protrusion  150  may be in the form of other shapes such as a triangle shape in which there is a first portion inclined at a first angle similar to the first portion  151 , a second portion inclined at a second angle similar to the second portion  152  or third portion  153 , and a third portion which is flat similar to the fourth portion  154 . 
     As an example, dimensions of the shutter protrusion  150  include a length of the first portion  151  being about 8.6 mm, a length of the second portion  152  being about 2.5 mm, a length of the third portion  153  being about 3.5 mm, and a length of the fourth portion  154  being about 8.3 mm. An angle between the first portion  151  and the fourth portion  154 , the first angle, may be about 40 degrees. An angle between the first portion  151  and the second portion  152  may be about 94 degrees such that an angle between the second portion  152  and the fourth portion  154 , the second angle, is about 46 degrees. An angle between the second portion  152  and the third portion  153  may be about 148 degrees such that an angle between the third portion  153  and the fourth portion  154 , the third angle, is about 78 degrees. The shutter protrusion  150  may protrude outward from the inlet shutter  14  by about 2.6 mm. A height of the inlet shutter  14  may be about 30 mm. However, the disclosure is not so limited and the respective dimensions of the shutter protrusion  150  and inlet shutter  14  may vary, though a height of the shutter protrusion  150  may be affected by an amount by which the object is to be raised or lowered or by a height of the inlet shutter  14 . 
       FIGS. 24A-24D  are partial perspective views illustrating a rotation of the inlet shutter  14  having the shutter protrusion  150 . Referring to  FIGS. 24A-24D , an interaction between the shutter protrusion  150  and an object while the inlet shutter  14  is rotated, is illustrated. As discussed above, rotation of the inlet shutter  14  about the first rotational axis C 1  can occur when the toner refill cartridge  9  is mounted to the toner refilling portion  10  and the toner refill cartridge  9  rotated. For example, when the toner refill cartridge  9  is rotated about the first rotational axis C 1 , the inlet shutter  14  is rotated with the toner cartridge  9 . Accordingly, the inlet shutter  14  may be rotated between the blocking position and the inlet position. Rotation of the toner refill cartridge  9  may be performed manually, for example, by a user manually rotating the toner cartridge  9 , which causes the inlet shutter  14  to also be rotated. For example, the toner refill cartridge  9  can be rotated about the first rotational axis C 1  by 180 degrees, as illustrated in  FIGS. 12-13 , to rotate the inlet shutter  14  to the inlet position, where the blocking portion  140  is offset from the toner inlet portion  120 . Or, the toner refill cartridge  9  can be rotated about the first rotational axis C 1  by 90 degrees, as illustrated in  FIGS. 19-20 , to rotate the inlet shutter  14  to the inlet position, where the toner inlet portion  120  and second toner inlet portion  141  are aligned. 
     The shutter protrusion  150  may be applied to the inlet shutter  14  illustrated in  FIGS. 12-13  as well as the inlet shutter  14  illustrated in  FIGS. 19-20 . According to an example, the object may correspond to the latching protrusion  161  or the latching portion  191 . For ease of explanation, an example where the object corresponds to the latching protrusion  161  is explained below, and the concepts applicable to latching protrusion  161  which is formed on the first latch member  16  may also be applied to the latching portion  191  which is formed on the second latch member  19 , though a height of the inlet shutter  14  as illustrated in  FIG. 18  may be increased to accommodate the vertical motion of the latching protrusion  191  when interacting with the shutter protrusion  150 . 
     As illustrated in  FIGS. 24A-24D , during rotation of the inlet shutter  14  to the inlet position ( FIG. 24D ), the first portion  151  of the shutter protrusion  150  initially makes contact with an object of the toner refilling portion  10  ( FIG. 24B ). In this example, the object corresponds to the latching protrusion  161 . The latching protrusion  161  is formed on the first latch member  16  that is movable in an upward and downward direction parallel to the rotational axis C 1 . Because the shutter protrusion  150  has a ramp or wedge shape, when the first portion  151  of the shutter protrusion  150  contacts the latching protrusion  161  while the inlet shutter  14  is rotated, the first latch member  16  and the latching protrusion  161  are lifted upwardly and the latching protrusion  161  slides along the first portion  151  of the shutter protrusion  150  until reaching the second portion  152  of the shutter protrusion  150  ( FIG. 24C ). As illustrated in  FIG. 24C , the first latch spring  17  may be compressed against the upper body  13  (not shown). At that point the first latch member  16  and the latching protrusion  161  begin to descend and the latching protrusion  161  slides along the second portion  152  of the shutter protrusion  150  and subsequently slides along the third portion  152  of the shutter protrusion  150  until the shutter protrusion  150  has transitioned past the latching protrusion  161  and coincidentally the inlet shutter  14  is in the inlet position where the toner inlet portion  120  is offset from the blocking portion  140  ( FIG. 24D ). Furthermore, as illustrated in  FIG. 24D , the first latch spring  17  may be decompressed. The angle of the second portion  152  may be less steep than the angle of the third portion  153 , for example to provide a smoother transition of the shutter protrusion  150  and to provide a less jarring effect to a user turning the toner cartridge  9 . 
     The interaction of the shutter protrusion  150  with the latching protrusion  161  provides a user with feedback regarding the status of the rotation of the toner refill cartridge  9  and inlet shutter  14  such that a user can ascertain whether the toner refill cartridge  9  is successfully mounted to the toner refilling portion  10  and the toner refilling portion  10  is ready to receive toner from the toner refill cartridge  9 . The interaction between the shutter protrusion  150  and the latching protrusion  161  as well as the raising and dropping of the first latch member  16 , may produce an audible noise, such as an audible clicking noise, that a user can hear. This noise can indicate to the user that the toner refill cartridge  9  has been successfully mounted to the toner refilling portion  10  and rotated, together with the inlet shutter  14 , to a position that will allow the plunger  93  to be pressed and the toner supplied to the toner refilling portion  10 . Additionally, a user rotating the toner refill cartridge  9  may physically feel the interaction between the shutter protrusion  150  and the latching protrusion  161  and thus receive tactile feedback indicating that the toner refill cartridge  9  has been successfully mounted to the toner refilling portion  10  and rotated, together with the inlet shutter  14 , to a position that will allow the plunger  93  to be pressed and the toner supplied to the toner refilling portion  10 . 
     Upon the inlet shutter  14  being rotated past the latching protrusion  161 , the inlet shutter  14  is in the inlet position and the toner inlet portion  120  is aligned with the toner discharging portion  940  of the toner refill cartridge  9  and offset from the blocking portion  140 . By pressing the plunger  93  in this state, toner may be supplied from the body  91  to the toner container  230  through the toner discharging portion  940  and the toner inlet portion  120 . When the toner refill cartridge  9  is mounted to the toner refilling portion  10  and the inlet shutter  14  is in a position other than the inlet position, the toner inlet portion  120  is closed such that the plunger  93  is prevented from pushing the toner through the toner discharge portion  940  out of the toner refill cartridge  9 . Therefore, a user who does not receive the audible or tactile feedback as discussed above when rotating the toner refill cartridge  9 , can avoid the inconvenience of an unsuccessful attempt of performing a plunging operation with the plunger  93 . Therefore, according to the examples described herein the operation of the shutter protrusion  150  improves a user experience. 
     Moreover, the examples described herein utilize features of the toner refilling portion  10 , such as the first latch member  16  and latching protrusion  161  or the second latch member  19  and latching portion  191 , which are provided to the toner refilling portion  10  to perform other functions which have been described herein. Therefore, additional costs can be avoided by not utilizing or manufacturing additional parts to interact with the shutter protrusion  150  to produce the feedback to the user when rotating the toner refill cartridge  9  together with the inlet shutter  14 . 
     A user may be provided feedback regarding whether the toner refill cartridge  9  is successfully mounted on the toner refilling portion  10  in a mechanical fashion as discussed above with respect to  FIGS. 23-24D , as well as in an electrical fashion as discussed above with respect to  FIGS. 5A-9 . For example, as illustrated in  FIG. 25 , the toner refilling portion  10  may include an inlet shutter  14  having the shutter protrusion  150  (not shown but located at a position corresponding to  145  or  145 - 2  as illustrated in  FIGS. 12 and 13  and diametrically opposite of  144 ) which mechanically interacts with the latching protrusion  161 , and a first connector  146  that is electrically connectable to the electrical contact portion  961  of the connection interface  96  of the toner refill cartridge  9 . The second connector  127  of the toner refilling portion  10  may transmit information about the toner refill cartridge  9  obtained through the first connector  146  to the controller  300  of the image forming apparatus  1000  and may transmit information about the development cartridge  2  obtained from the circuit unit  128  to the controller  300 . For example, the information about the toner refill cartridge  9  obtained through the first connector  146  and transmitted to the controller  300  may include authentication information indicating the toner refill cartridge  9  is a genuine or authentic source of toner supply and has been inserted. Upon this authentication the a user may be allowed to rotate the toner refill cartridge  9 . For example, the information about the development cartridge  2  obtained through the second connector  127  and transmitted to the controller  300  may include information regarding a position of the inlet shutter  14  when the inlet shutter  14  is rotated and the information about the toner refill cartridge  9  may include information regarding a position of the toner refill cartridge  9  when the toner refill cartridge  9  is rotated. As discussed above, the rotation detection sensor  148  may include contacts, for example electrodes, which are used to detect when the inlet shutter  14  enters a certain position as the inlet shutter  14  is rotated in conjunction with the toner refill cartridge  9 . For example, the rotation detection sensor  148  may detect when the inlet shutter  14  is rotated with the toner refill cartridge  9  by 180 degrees. 
     Furthermore, the output device  1020  and/or user interface  1010  may provide information regarding the position of the inlet shutter  14  when the inlet shutter  14  is rotated based on the information received by the controller  300  from the toner refilling portion  10  as well as information regarding a position of the toner refill cartridge  9  when the toner refill cartridge  9  is rotated based on the information received by the controller  300 . As explained above, the information may be in the form of a message may be presented on a screen of the user interface  1010 , a light indication, haptic feedback presented through the user interface  1010 , or a sound generated by an output device  1020  such as a speaker. The user interface  1010  and output device  1020  may be combined as a single device where the user interface  1010  includes the output device  1020  or vice versa. 
     By providing information to a user indicating a status of mounting of the toner refill cartridge  9  to the toner refilling portion  10 , in a mechanical and/or electrical fashion, the user can be better informed and readily ascertain whether a plunging operation is ready to be performed to inject toner from the toner refill cartridge  9  to the toner refilling portion  10 . 
     While various examples have been described with reference to the drawings, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims.