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Knitting needles

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  • 1. By Suneel Talekar- sr. Faculty- SOFT-Pune
  • 2. TYPES 3 TYPES OF KNITTING NEEDLES THE BEARDED NEEDLE the hook opening and closing device THE LATCH NEEDLE THE COMPOUND NEEDLE the hook, which takes and retains the thread to be looped a system allowing the needle to move and form the loop.
  • 3. FEATURES • The bearded or spring needle was the first type of needle to be produced. • It is the cheapest and simplest type to manufacture as it is made from a single piece of metal • The bearded needle is essentially a frame needle, the needles being fixed to move
  • 4. PARTS • The head, where the stem is turned into a hook to draw the new loop through the old loop. • The beard, which is the curved downwards continuation of the hook that is used to separate the trapped new loop inside from the old loop as it slides off the needle beard. • The stem, around which the needle loop is formed. • The eye, or groove, cut in the stem to receive the pointed tip of the beard when it is pressed, thus enclosing the new loop. • The shank, which may be bent for individual location in the machine or cast with others in a metal ‘lead’.
  • 5. BREADED NEEDLE AND KNITTING MACHINE PARTS
  • 6. Knitting action The rest position Backward swing and overlap shog (b, c). The return swing and second rise (c, d). Pressing (e) Landing (f). Knock-over and underlap shog (g)
  • 7. Knitting action
  • 8. Knitting action 1 2 3 4 5 6 7 1. The needle is in the (so-called) rest position, with the previously formed loop (a) held on its stem and covered by the hook. 2. The loop is cleared from the needle hook to a lower position on the needle stem. 3. The new yarn (b) is fed to the needle hook at a higher position on the needle stem than the position of the previous (‘old’) loop. 4. The yarn is formed into a ‘new’ loop. 5. The hook is closed, enclosing the new loop and excluding and landing the old loop onto the outside of the closed hook. 6. The new loop (b) is drawn through the head of the old loop (a). Simultaneously the old loop slides off the closed hook of the needle and is cast-off or knocked-over. 7. The old loop now hangs from the feet of the fully formed new loop and the knitting cycle starts again.
  • 9. Advantages • Less expensive • Strain on yarn is less • No possibility of fluff or lint accumulation on needle • Good for warp knitting machine Limitation • Required an additional element to close the beard during knitting • High wear and break easily • Limiting productivity • A knitting section occupies a considerable amount of space • Individual loop formation has to be achived by a loop forming element, this leads to a more complicated
  • 10. Characteristics Latch Needle Characteristics: 1. Most widely used in weft knitting. 2. More expensive needle than the bearded needle. 3. Self acting or loop controlled. 4. Work at any angle. 5. Needle Depth determines the loop length. 6. Variation of the height of reciprocating produces knit, tuck or miss stitch.
  • 11. Features-hook The Hook: The hook which draws and returns the new loop. The slot or Saw Cut: This slot receives the latch blade.
  • 12. Features The Cheeks or Slot Walls: It is either punched or riveted to fulcrum the latch blade. The Rivet: The rivet which may be plain or threaded. This has been dispensed with on most plated metal needles by pinching the slot walls to retain the latch blades. The latch blade: This latch blade locates the latch in the needle.
  • 13. Features The latch blade: This latch blade locates the latch in the needle.
  • 14. Features-latch and latch spoon The latch spoon: The latch spoon is an extension of blade and bridges the gap between the hook and stem.
  • 15. Features 7. The stem: The stem of latch needle carries the loop in the clearing on rest position. 8. The Butt: Butt of latch needle enables the needle to be reciprocated. 9. The Tail: The tail is an extension below the butt giving additional support to the needle and keeping the needle in its trick
  • 16. Latch needle
  • 17. Knitting action
  • 18. Knitting action
  • 19. Knitting action The rest position: The head of the needle hook is level with the top of the verge of the trick. The loop formed at the previous feeder is in the closed hook. It is prevented from rising as the needle rises, by holding-down sinkers or web holders that move forward between the needles to hold down the sinker loops.
  • 20. Knitting action-latch opening Latch opening: As the needle butt passes up the incline of the clearing cam, the old loop, which is held down by the sinker, slides inside the hook and contacts the latch, turning and opening it.
  • 21. Knitting action-clearing height Clearing height: When the needle reaches the top of the cam, the old loop is cleared from the hook and latch spoon on to the stem. At this point the feeder guide plate acts as a guard to prevent the latch from closing the empty hook.
  • 22. Knitting action-yarn feeding Yarn feeding and latch closing: The needle starts to descend the stitch cam so that its latch is below the verge, with the old loop moving under it. At this point the new yarn is fed through a hole in the feeder guide to the descending needle hook, as there is no danger of the yarn being fed below the latch. The old loop contacts the underside of the latch, causing it to close on to the hook.
  • 23. Knitting action-cast off Knocking-over and loop length formation: As the head of the needle descends below the top of the trick, the old loop slides off the needle and the new loop is drawn through it.
  • 24. Advantages • Major advantages of being self acting or loop controlled, so that individual movement and control of the needle enable stitch selection to be achieved. • Ideally suited for use with computer controlled electronic selection devise. • Latch needle can operate at any angle. • Variation of the height of vertical can produce knit, miss and tuck loop which helps to manufacture different design fabrics. Limitation • Latch needle are thick and rigid, so any deflection id design effect on fabric • Needle deflection is difficult • It imposes a certain strain on yarn • There is also possibility of fluff or lint accumulation on the latch due to rubbing of the yarn on needle
  • 25. Difference between latch and bearded needle Latch needle 1. It contains a hook portion at the top & a latch reverted at certain distance from the needle head. 2. The main element of knitting is latch. 3. The latch needles are self-acting. 4. Do not need outside Spring bearded needle 1. This needle consists of a top hook curved downwards with a finished tip. 2. The downward continuation is called beard. 3. The spring bearded needles are not self-acting type. 4. It requires pressure to
  • 26. Difference between latch and bearded needle Latch needle 5. Machine gauge is coarser then spring bearded needle. 6. This one is not simple type needle. 7. It has reduced stroke. 8. Most widely used in weft knitting. 9. Complicated operating system. 10. The latch needle is more Spring bearded needle 5. Machine gauge is finer then latch needle. 6. Simple type of needle. 7. It has more stroke than latch needle. 8. More widely used in circular single knitting. 9. Easy operating system. 10. The spring bearded
  • 27. Types pusher type The open-stem ‘pusher type’ or slide needle tongue sliding The tubular pipe needle has its tongue sliding inside the tube of the open hook.
  • 28. Features • Compound needles consist o two separately controlled parts- the open hook and the sliding closing element (tongue, latch, piston, plunger) • It is most popular in warp knitting machines • Strain in not put on the yarn • Both members of compound needle have a straight, thus knitting speed can be increased. • These needle are very expensive

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