Image forming apparatus

An image forming apparatus comprising:

• image forming means for performing image forming operation,
• developing means for developing, by using developer containing toner, an image formed by said image forming means,
• toner supply means for supplying toner to said developing means,
• first control means for controlling said toner supply means, to supply a prescribed amount of toner with prescribed timing during said image forming operation,
• toner density detection means for detecting a toner density of the developer in said developing means;
• second control means for controlling said toner supply means, to continue supply of toner till it is determined that the toner density in said developing means attain a prescribed density, in response to an output of said toner density detection means;
• and
• means for permitting a start of image forming operation by said image forming means during toner supply operations by said second control means,
• said second control means continuing supply of toner even during the permitted image forming operation.

An image forming apparatus comprising:

• image forming means for performing image forming operation,
• developing means for developing, by using developer containing toner, an image formed by said image forming means,
• toner supply means for supplying toner to said developing means,
• first control means for controlling said toner supply means, to supply a prescribed amount of toner with prescribed timing during said image forming operation,
• toner density detection means for detecting a toner density of the developer in said developing means;
• second contorl means for controlling said toner supply means, to continue supply of toner till it is determined that the toner density in said developing means attains a prescribed density, in response to an output of said toner density detection means;
• and
• means for delaying a start of said image forming operation till toner supply operation by said second control means come to an end if the start of said image forming operation by said image forming means is instructed by said first input means during the toner supply operation by said second control means.

An image forming apparatus comprising:

• image forming means for performing image forming operation,
• developing means for developing, by using developer containing toner, an image formed by said image forming means,
• toner supply means for supplying toner to said developing means,
• first control means for controlling said toner supply means, to supply a prescribed amount of toner with prescribed timing during said image forming operation,
• toner density detection means for detecting a toner density of the developer in said developing means;
• second control means for controlling said toner supply means, to continue supply of toner till it is determined that the toner density in said developing means attains a prescribed density, in response to an output of said toner density detection means;
• and
• multi-operation means for performing multi-operation for starting operation of said image forming means to perform said image forming operation successively by a plural number of times, wherein said multi-operation means interrupts said multi-operation to cause said second control means to perform supply of toner when a start of the supply of toner by said second control means is instructed by said second input means during said multi-operation, amd said multi-operation means restarts said multi-operation after the end of said supply of toner.