A front element (10) is provided close to the front portion (31) of the needle (3), said element (10) being foldable on itself substantially about a first folding axis (A) parallel to the front portion (31); means (21, 22, 13, 16) are also provided to constrain the rear portion (32) of the needle to the front element (10) such that the needle (3) can rotate with respect to the element (10) substantially about a second folding axis (B) substantially perpendicular to the needle (3). The device (1) can assume a first operating configuration in which the element (10) is folded on itself by rotation along the first axis (A), with the front portion (31) enclosed between the two fins (10') of the element (10), these facing each other in mutual contact; the device (1) can also assume a second operating configuration, by rotating the element (10) with respect to the needle (3) along said second axis (B), in which the front portion (31) freely projects from the element (10). IMAGE
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