Weft feeder for weaving looms including a winding group (W) to wind a weft thread on a weft feeder drum (D), an optical unit (P) provided with one or more optical sensors (T, R, S, Z) to monitor the weft thread winding on the drum (D) and its release from said drum, an electromagnet group (E) to control the movement of a stop pin (15) which prevents the weft thread from being released from said drum (D), wherein said electromagnet group (E) is enclosed within a cup-shaped shell (11) from which said stop pin (15) protrudes to interfere with said drum (D), and a weft feeder processing board which controls the logical functions of the weft feeder. The optical group (P) is contained in a protection box (1) and it is electrically connected to said weft feeder processing board by direct wiring (6), and said protection box (1) is housed and removably fixed inside said cup-shaped shell (11).

Weft feeder for weaving looms including a winding group (W) to wind a weft thread on a weft feeder drum (D), an optical unit (P) provided with one or more optical sensors (T, R, S, Z) to monitor the weft thread winding on the drum (D) and its release from said drum, an electromagnet group (E) to control the movement of a stop pin (15) which prevents the weft thread from being released from said drum (D), wherein said electromagnet group (E) is enclosed within a cup-shaped shell (11) from which said stop pin (15) protrudes to interfere with said drum (D), and a weft feeder processing board which controls the logical functions of the weft feeder. The optical group (P) is contained in a protection box (1) and it is electrically connected to said weft feeder processing board by direct wiring (6), and said protection box (1) is housed and removably fixed inside said cup-shaped shell (11).