Patent GB-992068-A (GB)
Title: Improvements in treatment rolls for thread treating machines
Inventor: BARKER SYDNEY WARREN
IPC: D01D10/04
Filed: 1961-02-28
Abstract: 992,068. Thread-treatment and advancing rolls. NELVALE Ltd. Dec. 8,1961 [Feb. 28,1961; May 5, 1961], Nos. 43967/61 and 3380/62. Divided out of 990, 231. Headings DID and D1L. In a thread-treatment roll in a machine for storing and advancing threads, e.g. a machine as in Specification 990,231 at least the end face toward which the thread advances, is provided with a thread pick-up formation adapted to engage an adjacent loop as it approaches and place it on the circumference of the roll, the formation comprising a projecting ledge which is curved backwards, relative to the direction of rotation of the roll, in a path of progressively increasing radial distance from the axis of the roll to a point on the roll circumference into which the ledge blends smoothly. In Figs. 1, 2 a thread 21 makes a number of loops around an upper roll 8 and two lower rolls 14, 15, the axis of the upper and lower rollers being mutually inclined. Between the rolls 14, 15 the loops of thread passing over the upper or lower part of the circumference of a treatmentroll 20 having a number of lands or sections 20a... 20g each dipping into a separate trough of treating liquid. Each of the lands &c. is provided with a pick-up formation according to the invention to take-hold of a lacing-up band or a threadloop approaching the leading-face of the roll and place it on the circumference of the roll. In, Fig. 4 the ledge is the abrupt end 26 of a helical chamfer 27 in the leading end face 28, the ledge preceding a gap 25 with chamfered walls in a flange 24. In Fig. 7, the ledge is provided by the inner wall 30 of a hook member bolted to the leading- face of the roll, the wall also forming the trailing- edge of the gap 25. In Fig. 10, the ledge is provided by an asymmetric scroll surface 38 bounded by a shallow wall which converges on the gap 25 in the flange 24. A modified scroll of segmental form is also described. (Fig. 15, not shown). To ensure that the ledge does not pick up the lacing- up band at a point half-a-revolution away from the correct point in which case it would place the band and loops on the top of the roll, a deflector is provided to urge the band away from the end face 28 before it crosses the path of the ledge on the upward journey. In Fig. 4, the deflector is provided by suitably contouring the chamfer 27; in Figs. 7 and 10 by a central cam-boss 32, 39 respectively; in Fig. 15, not shown, by the segmental scroll itself. To prevent the thread rubbing against the end-face at the discharge end of the roll, a deflector is provided in the form of an upright bar bent over at its upper end into a recess in the end-face of the roll (Fig. 8 not shown) or, a gapped flange may be provided similar to the flange 24 and of a width substantially equal to the spacing between adjacent thread loops and spaced from the delivery end of the roll by a surface sufficient to accommodate a single turn of thread; or a pickup formation may be provided at the delivery end of the roll which is a mirror-image of any of those described as being provided at the leading-end, so that rubbing threads are picked up and placed back on the roll; or a groove or gapped flange may be provided on either of the rolls 14, 15. One use of a mirrorimage pick-up formation of the delivery end of the roll also helps to promote even spacing of the loops; e.g. a hook which is the mirror-image of that shown in Fig. 7, will pick up a loop leaving the roll within its range and replace it on the roll, repeating the process until the loop formation is stabilized. One axis of the treatment roll may be skew to the rolls 14 and 15, the direction of skew being such as to obviate the need for a deflector to prevent incorrect pick up. The rolls 8, 14, 15 and 20 may be stepped, tapered or grooved.