Patent ID: 8891983
Filing Date: 2014-11-18
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member; a developing device including a developer container for containing a developer, and a developer carrying member for forming a developed image on said image bearing member based on an electrostatic latent image; a transferring device for transferring the developed image onto a recording material; a cleaning device including a cleaning member for removing the developer remaining on said image bearing member after transfer of the developed image and including a collection container for collecting the developer removed by said cleaning member; a measuring device for measuring an amount of the developer in said developer container; first calculating means for calculating an amount of the developer supplied from said developer container to said image bearing member; second calculating means for calculating an amount of the developer transferred onto the recording material; and a controller for outputting an information signal relating to a developer amount accumulated in said collection container on the basis of a first amount of the developer calculated by said first calculating means and a second amount of the developer calculated by said second calculating means, wherein said first calculating means calculates a first amount of the developer supplied to said image bearing member from an inside of said developer container, on the basis of an amount of the developer in said developer container as measured by said measuring device after an image forming operation and an amount of the developer initially contained in said developer container, and said controller outputs the information signal relating to the developer amount accumulated in said collection container on the basis of the first amount of the developer calculated by said first calculating means and the second amount of the developer calculated by said second calculating means.