Patent ID: 7466938

Claim:
A laser beam printer apparatus, comprising: an exterior cover; a frame body made of a metal arranged inside said exterior cover and including a side plate and a horizontal plate having an opening; a motor arranged above said opening and secured on the inside of said side plate with a screw; a cartridge frame body secured to said side plate for supporting a toner cartridge; a motor cover arranged in said opening and locked to said horizontal plate; two torsion springs arranged on a bottom surface of said motor cover and having elasticity to press inserted said toner cartridge from an upper side to a lower side; a lead connected to said torsion springs; and detection means for receiving a signal of said lead to detect insertion of said toner cartridge into said cartridge frame body; wherein said motor cover includes a first locking nail formed in an end portion on one side thereof in a front-and-rear direction and a second locking nail formed in an end portion on the other side thereof in said front-and-rear direction, each of said first locking nail and said second locking nail is formed to catch an edge of said opening, each of said torsion springs is arranged to contact an identification electrode formed on said toner cartridge, said torsion springs press said toner cartridge downward when said toner cartridge is inserted into said cartridge frame body, said toner cartridge is inserted into said cartridge frame body to achieve contact between said torsion spring and said identification electrode to allow detection of insertion of said toner cartridge into said cartridge frame body, said first locking nail and said second locking nail are formed to allow said motor cover to be removed from said opening, said motor cover can be removed by removing said exterior cover, and said screw securing said motor to said side plate can be removed by removing said motor cover.