Patent GB-925462-A (GB)
IPC: D04B9/46
Abstract: 925,462. Knitting. M. NEBEL. April 16, 1959 [April 16, 1958], No. 12974/59. Class 74 (2). A rotating cylinder circular seamless-hose knitting-machine for producing ladder-proof fabric has at least two feed systems (e.g. A<SP>s</SP>, Ms) and sinkers with different loop-sinking levels P<SP>a</SP>, P<SP>t</SP> for forming courses a, b of two different thread and loop lengths and is operative so that (i) at one feed system, predetermined (e.g. alternate) needles will form stitches B of a course a on one level P<SP>t</SP> of the sinkers and the remaining needles will receive but not knit the thread and at another system all the needles will form stitches of a course B on the other level P<SP>a</SP> of the sinkers and (ii) portions of the thread unknitted in the course a will be combined with stitches in the following course b to form two-thread stitches D and, as a result, will so rob thread from the stitches B in the shorter thread length course a as to form small locking stitches ; and needle selecting mechanism S1 S2 is operative so that, after every two-course cycle, the needle motions are interchanged so that those needles which previously did not knit in course a now knit and those which previously knitted do not knit in making the next course a. The singlethread stitches A of courses b become particularly large. An additional thread c may be fed in courses b to be knitted only by the needles forming stitches A. Fabric formation.-After a course b has been formed, at the main feed Ms, say, Fig. 8, needles N2 holding stitches A and needles N1 holding double thread stitches D are all cleared by jacks and by cam T4, respectively, and take yarn at feed As for a course a; but only needles N1 draw loops over sinker levels Pt and cast off, whereas needles N2 remain in a position where the thread rests at F, Fig. 3, on their open latches Z. All needles then move at level E towards feed Ms, cam T2 being withdrawn, needles N1 are raised by jacks to clear, and all needles take yarn and knit. Additional sinker cams P1, P4 are provided and may be withdrawn, when required, to allow the usual cams P2, P3 to operate. In order that the thread for course b shall be drawn obliquely over sinker ledges Pa, the sinkers P are advanced sooner than usual and sufficiently far by edges P10, P11 of additional sinker cam P1 and when the needles have reached their lowest position (needle N2<SP>x</SP> and sinker Px) the sinkers are guided by edges P11, P12 of cam P1 to casting-off position. Preferably the sinker hooks remain advanced until just before formation of the next course b and, during formation of course a, are sufficiently advanced to bring ledges P<SP>t</SP> below the needle hooks. The sinker hooks P<SP>h</SP> act in the sinker loops SL, Fig. 11, of the preceding course a. When knocking-over is complete, the sinkers are free from the action of cams and move a little rearwardly, being pressed elastically against the sinker loops by a spring X. In an alternative arrangement, Fig. 9, the courses a are formed at the main feed, the stitch cam thereat being in two parts T<SP>x</SP>, T<SP>z</SP> of which part T<SP>z</SP> can be moved from a lower (full line) position of normal knitting to an upper (dotted line) position in which it lowers those needles which are not to knit to the level E. The casting-off procedure may be used in the formation of a very loose double welt. Sinkers.-The sinkers have each a hook ph which, at its root, is not wider than the needle hook. The loop sinking point P<SP>a</SP> may be at the same level as or higher than the normal loop sinking point P2. The lower loop-sinking point P<SP>t</SP> may be a little higher or lower than the point P<SP>d</SP>. The shape of the sinker may be modified as indicated by the dotted line P<SP>f</SP>. Specification 925,463 is referred to.