Patent ID: 9547257
Date: 2017-01-17
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: a developer conveyance device to transport developer, the developer conveyance device including a positive-displacement pump to alternately generate positive pressure and negative pressure by changing a volume of an internal space thereof; a destination developer container to which the developer conveyance device transports developer; a sensor provided to the destination developer container to detect developer in the destination developer container; and a controller to control the positive-displacement pump according to a detection result of developer generated by the sensor, wherein the positive-displacement pump takes in air and developer and discharges the developer together with air to the destination developer container, and the controller disables detection of developer by the sensor in a non-detection period that starts from a stop of the positive-displacement pump, and wherein the controller disables the detection of developer by the sensor while the positive-displacement pump is operating.