| 摘要 |
A powder conveyance device including a reciprocating displacement pump, through which powder, together with air, passes to be conveyed from an origin to a destination using negative pressure and positive pressure alternately generated in the reciprocating displacement pump by changing an internal volume of the reciprocating displacement pump, and a drive part connected to the reciprocating displacement pump to drive the reciprocating displacement pump. A period of time to increase the internal volume of the reciprocating displacement pump to generate the negative pressure is set longer than a period of time to reduce the internal volume of the reciprocating displacement pump to generate the positive pressure.
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