Powder feeding device

A powder feeding device comprising:

• a transfer housing including a transfer housing body configured to extend in a front-rear direction, wherein an inner surface of the transfer housing body forms a shape of a truncated cone and forms a decreasing cross section as it goes rearward;
• a feeding screw including a feeding screw shaft accommodated in the transfer housing body, the feeding screw shaft being spaced apart from the inner surface of the transfer housing body, and an outer surface of the feeding screw shaft forming a shape of a truncated cone;
• a feeding housing including a feeding housing wall connected to a lower end of the transfer housing, the feeding housing wall configured to form a closed loop;
• and
• a feeder including a feeder shaft positioned in the feeding housing and configured to extend in the front-rear direction,
• wherein the transfer housing further includes a transfer housing opening that is formed in the transfer housing body and is positioned below the feeding screw shaft,
• wherein the feeding screw further includes a feeding screw blade configured to protrude from the outer surface of the feeding screw shaft, and
• wherein the feeder further includes a plurality of feeder blades configured to protrude from an outer surface of the feeder shaft.