| 摘要 |
a bottom plate (5) of weft that has holes (5a) formed by a fixed space and is fixed and projected on body supporters (1)(2) of the top and the bottom sides; a detector (3) of high pressure equipped with bolts on a supporting body (8) equipped on the supporter (2) of the end part of a bottom plate; several yarn catch tools (7) attached on an mounting stand (9) to move in and out to a of a bottom plate (5) in a pass way of weft in opposition to the high pressure side; a detector of low pressure (4) attached to the inner side of the stand (9).
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