The loom of weft yarn thickness arrester, especially hydraulic loom, including swinging both arms needle (7), first arm (71), it, which be used to be directed to both arms needle (7) into the position (7) two that the basic thread (11) and the second arm (72) of the system are connected to sensor (8), is reversibly articulated with single-arm lever (6), is a kind of reversible loom for being hinged on fixed countershaft (5) and being movably mounted to lath (21). Be in contact there are fixed backstop (41) and two needles (7) position of first arm (71) two (7) in front of needle of the lever with single armed in (6) up and down of upper and lower position of swing both arms needle (7) in the path contacts or the fabric (1) in allocations of edge (13). IMAGE
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