Toner cartridge with a lock mechanism

A toner cartridge with a locking mechanism, comprising

• a body provided with a top cover and used for receiving developer, said locking mechanism used for locking the toner cartridge into an image forming apparatus and arranged on said body, said locking mechanism comprising a handle hinged with said top cover, a gear fixedly connected with the handle and a locking lever capable of reciprocating;
• and said locking lever comprising a rack engaged with said gear,
• wherein the locking mechanism also comprises a torsion spring used for realizing the automatic reset of the locking lever,
• wherein the torsion spring is arranged on an articulated shaft for the handle;
• and two free ends of the torsion spring are butted with the handle and the top cover respectively,
• wherein the handle is driven to be close to the top cover under the action of a torque force of the torsion spring under the locking state, and the gear is engaged with the rack to drive the locking lever to be extended out of the top cover so as to lock the toner cartridge;
• and when the handle is under the unlocking state by overcoming the torque force of the torsion spring under the action of an external force, the gear and the rack are operated to drive the locking lever to be retracted into the to cover so as to unlock the toner cartridge.