the invention is an improved guidafilo (1) for machine rettilinee by comprising: a body yarn (2) sliding along guide (31) charged in a rail (3) and with at least a resno (6) comprising at least a pair of rods (61, 62) with blades (65, 66) for locking said guidafilo (1) to the guide (31).these rods (61, 62) are mechanically cooperating between them by means of conjugate profiles (67, 68) belonging to them are the lifting of these roller skates (65.66) from the guide (31) when contrast media (9) interfere with the ends (361) of at least one of said rods (61, 62).
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