Electromagnet for stopping the unwinding of the weft yarn in weft feeding devices for weaving looms
AssigneeROJ Electrotex S.p.A.
InventorBruno Maina
Life of this patent
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Abstract
In an improved electromagnet structure for stopping the unwinding of the weft yarn in weft feeding devices for weaving looms, comprises--mounted in a casing--an electromagnetic coil and an armature mobile therein. The armature comprises a shank, at least partly constituted by a piece of stainless steel cable and a head of ferrous material fixed to the shank by rolling and/or plastic deformation. The head is urged, on activation of the coil, to strike against a stopping plate interposed between the casing and its closure cover, against the action of a return spring and by way of a damping washer carried by the plate.
Claims2
In combination with a weft feeding device winding drum, means for selectively stopping the unwinding of a weft yarn from the drum, said means comprising a shank selectively movable toward and away from the drum into and out of the path of a weft yarn unwinding from the drum, a ferrous head secured to one end of the shank, an arresting plate, a damping element fixed to said plate in a position to be contacted by said head when said shank moves toward the drum, a return spring acting on the head to urge the head away from the damping element, an electromagnetic coil surrounding the shank and adapted to urge the head in a direction toward the drum against the action of the spring, the shank being in the form of a cable of stainless steel strands.
Dependencies are inferred from the claim text.