Structure for selectively locking toner inlet shutter of toner refill portion based on rotational phase of toner refill cartridge

A printer comprising:

• a main body including a communicating portion;
• a development cartridge attachable to and detachable from the main body, the development cartridge to supply toner contained in a toner container to an electrostatic latent image formed on a photoconductor, to form a visible toner image;
• a toner refilling portion comprising:
• a toner inlet portion connected to the toner container,
• a mounting portion to receive a toner cartridge insertable from outside of the main body through the communicating portion to be mounted to the mounting portion,
• an inlet shutter, with the toner cartridge rotating, rotatable between
• a blocking position to block the toner inlet portion from receiving toner and
• an inlet position to open the toner inlet portion to receive toner, and
• an electrical contact portion electrically connectable to the toner cartridge, through which an electrical signal is inputtable;
• a locking unit to selectively lock and unlock the inlet shutter;
• and
• a controller to control the locking unit to lock and unlock the inlet shutter based on the electrical signal input through the electrical contact portion.