| 摘要 |
From the needle tip (18), the working section (17) extends axially to the lower shaft section (20) which continues to the upper shaft section (25). All sections extend along the axis (16) and are mutually-coaxial. The needle is terminated at the top by a retention section (32). This is a straight extension in the transverse direction (31), i.e. at right angles to the axis. The diameter of the upper shaft section exceeds the mean diameter of the retention section, as well as that of the lower shaft section. All sections have constant cross sections along their lengths. The retention section has the same cross section as that of the lower shaft section. The upper shaft section has longitudinal lines of contact uniformly distributed around it. These optionally spiral around and along the upper shaft section. Between these lines the remaining upper shaft surfaces lie within a notional cylinder of contact. The lines of contact rest against the internal surface of a needle holder of the textile machine, to fix the needle transversely with respect to the longitudinal axis. The upper shaft section may have cross sections of diverse geometrical form. The edges at the lines of contact may be rounded. The area of the upper shaft section corresponds with that of the lower shaft section and/or of the retention section. The needle is made from a cylindrical blank, avoiding cutting. Suitable techniques include tension-, pressure- or thrust-forming methods. The upper shaft section is formed from the blank. The corresponding needle holder for the machine is a beam with parallel grooves along its upper surface. Penetrating bores extend down from the grooves, at regular spacing, to accommodate the needles. The bore diameter exceeds the mean width of the grooves or the width at their bases. Independent claims are included for the following: (A) the method of making the needle; (B) and a needle holder for a textile machine. |
