Image forming apparatus with a sensing device that determines the presence or absence of a toner cartridge

An image forming apparatus comprising:

• a toner cartridge removably mounted to a developing section and storing toner to be replenished to said developing section;
• moving means including a portion adjoining a toner outlet portion of said toner cartridge, for moving said toner cartridge;
• first sensing means for determining whether or not said toner cartridge is present at a preselected position on a path along which said moving means moves said toner cartridge;
• second sensing means for sensing opening and closing of a cover member which opens and closes in the event of replacement of said toner cartridge;
• control means for inhibiting said moving means from operating;
• and
• storing means for storing an occurrence that said moving means in movement is caused to stop moving by said control means;
• wherein when said second sensing means senses the closing of said cover member, an output of said first sensing means is neglected on the basis of said occurrence stored in said storing means.

An image forming apparatus comprising:

• a toner cartridge removably mounted to a developing section and storing toner to be replenished to said developing section;
• moving means including a portion adjoining a toner outlet portion of said toner cartridge, for moving said toner cartridge;
• sensing means for determining whether or not said toner cartridge is present at a preselected position on a path along which said moving means moves said toner cartridge;
• and
• storing means for storing, when a power switch of said apparatus is turned off while said moving means is moving said toner cartridge, an occurrence that said toner cartridge has been in movement at the time of turnoff of said power switch;
• wherein when said power switch is turned on after the turn-off, an output of said sensing means is neglected on the basis of said occurrence stored in said storing means.