Patent ID: 9031474
Filing Date: 2015-05-12
Classification: G03G

Abstract:
1. A powder feeding device comprising: a powder container configured to contain powder; a feeding tank including an input port through which the powder is supplied from the powder container, an output port through which the powder is discharged to outside, and a suction port through which air in the feeding tank is suctioned; a negative pressure room configured to be in communication with the feeding tank via a suction port communicating tube connected to the suction port; an air suction device configured to be in communication with the negative pressure room via a negative pressure room communication tube connected to a negative pressure room suction port formed on the negative pressure room; a suction port opening and closing unit configured to open and close an inside of the suction port communicating tube; a negative pressure room opening and closing unit configured to open and close an inside of the negative pressure room communication tube; an output port opening and closing unit configured to open and close the output port; and an air supply device configured to supply air to the feeding tank via a flow path outside of the negative pressure room.