Group of reflection optic sensors in a weft feeder for weaving looms

1) Group of optic sensors (S) in a weft feeder, in particular for weaving looms, of the type wherein one or more pairs of emitting sensors (E) and receiving sensors (R) are arranged on a portion of the weft feeder (C) which extends laterally to the drum (T) of the weft feeder whereon the coils of the weft thread are wound, so as to form optic radiation going-paths, from each one of said emitting sensors (E) to a reflecting surface (9) provided on said drum (T) and optic radiation back-paths, from said reflecting surface (9) to the corresponding receiving sensors (R), for detecting the presence/absence of a thread which crosses said paths, characterised in that it comprises:

• SMT-type optic sensors (E, R) welded on a printed-circuit board (8) and having the optic axis parallel to the plane of said board (8);
• a first group of total-reflection mirrors (V), one for each pair of emitting/receiving sensors (E, R), inclined so the as to deviate an optic radiation parallel to the plane of the board (8) in a plane perpendicular to or inclined with respect to the same;
• and a second group of partial-reflection mirrors (H), one for each pair of emitting/receiving sensors (E, R), inclined so as to partly deviate an optic radiation, keeping it in a plane parallel to the plane wherein the board (8) lies.