Patent GB-888470-A (GB)
Title: A yarn or filament processing device
IPC: D01D10/04
Filed: 1958-04-14
Abstract: A yarn or filament processing device comprises a first roller 1 upon which the yarn or filament 3 is to be processed, a second roller 2 so mounted that the axes of the rollers lie in parallel planes and are slightly crossed, the rollers being so arranged that rotation of the rollers about their axes in the same sense causes quasi-helical turns of yarn or filament that surround and are in contact with the rollers to move along the rollers, at least one helical thrower ring 8 fixed to the first roller and extending around the periphery thereof through an angle of at least 360 degrees to divide the roller into more than one yarn or filament treatment zones, 5, 6, 7, means (not shown) for supplying different processing liquids to the different zones, the or each helical thrower <PICT:0888470/IV (a)/1> <PICT:0888470/IV (a)/2> <PICT:0888470/IV (a)/3> <PICT:0888470/IV (a)/4> <PICT:0888470/IV (a)/5> <PICT:0888470/IV (a)/6> ring having at least one slot 9 through which the yarn or filament turns can pass from one side of the helical thrower ring to the other, the inclination of which slot or slots relative to the axis of the first roller is opposite to the inclination of the lines of contact between the turns of the yarn or filament relative to the axis of the first roller, and a yarn or filament guide 12 arranged in the region of the or each helical thrower ring for controlling the passage of yarn or filament turns through the slot.  The helical thrower ring may, as shown, have a U-shaped cross-section, the centre portion of the U bearing on the roller and the pass slot 9 of the helical thrower ring being situated between the limbs of the U.  Alternatively (Fig. 5), the helical thrower ring may consist of a plurality of helically extending vanes 19 overlapping in circumferential direction, the slots 20 being contained between these vanes.  Alternatively again, the helical thrower ring may be constructed as a flat ring having one or more grooves inclined relatively to the circumference and serving as pass gaps.  As shown (Fig. 6), the helical thrower ring 24 is helically coiled and of U-shaped cross-section, its overlapping end portions being closely adjacent.  The pass gap 25 is formed by the helical groove contained between the two limbs of the U-profile, and that end portion of the helical thrower ring which, in the direction of rotation, is the leading end, is cut away obliquely and has a wedge-like shape.  The yarn or filament guide may be supported in a resiliently yielding manner on a fixed carrier 10, so that the guide is capable, at first, of stopping the leading yarn or filament turn 4 which has approached and contacted it and then yields under the influence of a few following turns of the yarn or filament until these turns are seized as a bunch, along with the leading turn, by the helical thrower ring and advanced at an increased speed, thus allowing the guide to be returned from the displaced position (Fig. 3) to its normal position (Fig. 2) by the resilient action of the support member, the guide in this latter position preventing the yarn or filament turns situated in advance of the helical thrower ring from moving back to re-contact the helical thrower ring.  Thus the outer surface of the guide may have, in section in the plane of Figs. 2 and 3, substantially the shape of a U with flat centre portion 12a and divergent limbs 12b, 12c, the latter of these limbs, in the direction of movement of the turns, keeping away from the helical thrower ring turns of yarn or filament situated beyond the ring (i.e. 12c, when the turns move from right to left).  The guide may be attached, for the purpose of achieving a resiliently yielding support arrangement, to one end of a member 11 flexible at least in the plane of Figs. 2 and 3, the other end of the member being mounted on a stationary carrier rod 10 substantially parallel to the axis of roller 1.  Thus the member 11 may be a rubber sleeve, as shown, or may be a coil spring. Alternatively (Fig. 4), the outer surface of the guide may have, in a section in the plane of the paper, the shape of a V with a rounded surface between its limbs, and its support assembly may comprise a sliding guide arrangement 14, 15, and a spring 16 which tends to resist the displacement of the guide in the direction perpendicular to the axis of roller 1, which is caused by the leading yarn or filament turn and a few following turns, and which effects the return movement of the guide to its normal position after the passage of each bunch of turns through the slot.  Both types of guide are of small circular cross-section, in the plane at right angles to the paper.