Modulated thread breaking device for weft feeders.

摘要

The device has a first lamina (19) and a second lamina (23) that are arranged opposite one another and are supported by pairs of fixed (20) and respectively movable bars (24) that engage the ends of the respective laminae, flexing them in an arched shape; the laminae are arranged opposite each other at their convex face. The movable bars (24) are supported by a corresponding movable element (26) which is suspended elastically and is provided with an energization coil (31) that is subjected to the field of a permanent magnet (27). The coil (31) of the movable element (26) is supplied with an energization current (I) that is modulated in proportion to the advancement speed or mechanical tension of the thread. <IMAGE>