Process for manufacturing in crochet galloon machines ribbons for tear type quick-closing devices, and a crochet galloon machine for manufacturing said ribbons

A crochet galloon machine for manufacturing ribbons of synthetic fabric provided with flexible hooks for quick-closing devices of the tear type, comprising:

• at least one needle bar (2) having needle guide grooves (2a) disposed in side by side relationship;
• a plurality of eye-pointed needles (3) through each of which at least one respective warp thread (4) passes which is intended for forming a chain (5);
• a plurality of threading tubes (6) each adapted to carry a respective weft thread;
• a plurality of shaping elements (11) adapted to form successive sequences of loops (7) with the weft threads, which loops are substantially transverse to the extension direction of the chains (5) and emerge from the surface of the ribbon (10) being worked;
• a ribbon collecting unit (13);
• wherein it comprises:
• a heat-treatment unit (14) disposed at said shaping elements (11) for substantially stiffening said loops (7) so as to set the geometric shape of same;
• a cutting device (15) disposed upstream of said ribbon collecting unit (13) for cutting off said stiffened loops (7) so as to obtain a length of hook-shaped thread (8) from each of them.