group of the reserve winding wire texture development of coil variable adjustable with a single operation, for use in porgitrama - meters for weaving looms

摘要

In a measuring weft feeder (WF) for fluid jet looms, comprising a weft yarn reserve winding unit (2) with variable turn length, said length can be adjusted with a single operation. For this purpose, the winding unit (2) comprises a drum of adjustable diameter, formed by associating a fixed eccentric cylinder (5) with a plurality of movable rods (6), parallel to the axis of said cylinder (5) and surrounding a wide portion of its periphery, the distance of said rods (6) from said cylinder (5) being variable and adjustable for each rod (6) or for groups of rods (6). For each rod (6) or group of rods (6), a control arm (8) is provided slidable into a guide (9) of the winding unit (2) positioned perpendicularly to the axis of said unit (2), said arms (8) being movable simultaneously into the respective guides (9) - the length of the strokes varying from one arm to the other - under the control of a single operating member.