CPC G03G 15/0891 (2013.01) [G03G 15/095 (2013.01); G03G 21/105 (2013.01); G03G 15/1615 (2013.01); G03G 2215/0827 (2013.01); G03G 2215/1661 (2013.01); G03G 2221/1624 (2013.01)] | 9 Claims |
1. A powder conveying device comprising:
an inflow portion into which powder is to flow from an outside of the powder conveying device;
a discharge portion from which the powder is to flow out to the outside of the powder conveying device;
a conveying screw including a shaft and a blade, the conveying screw being configured to convey the powder from the inflow portion to the discharge portion in a conveying direction; and
a flange on at least one of an upstream end or a downstream end of the shaft and extending perpendicular to the shaft with a set gap existing on a surface of the shaft between the flange and an end of the blade, the set gap having a surface spray coated with a material having a lower friction with the powder than another surface portion of the shaft at a position other than the set gap, wherein the surface of the set gap has the material applied in a plurality of stripes extending in a length direction of the shaft.
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