| 摘要 |
This device (1) for excluding foreign matter comprises: an exclusion path (12) defined by the trajectory of descent of a starting material between an upstream-end transport path (8) and a downstream-end transport path (10); an upper detector (14) having a lower background (14a) and an upper light input/output unit (14b); a lower detector (16) having an upper background (16a) and a lower light input/output unit (16b); a first area sprayer (34); and an exclusion chute (40). The lower light input/output unit comprises an optical window (26) and a shield (28). The device for excluding foreign matter comprises a first gap (42) defined to the lower side of the downstream-end transport path between the lower light input/output unit and the exclusion chute, and partition plates (46, 72) attached at the upper end of the exclusion chute, for partitioning into an upstream end and a downstream end, with the first gap as the boundary. |
